feat(dns): restrict plain DNS output traffic

.devcontainer/Dockerfile

@@ -1,2 +1,2 @@
 FROM ghcr.io/qdm12/godevcontainer:v0.21-alpine
-RUN apk add wireguard-tools htop openssl tcpdump iptables
+RUN apk add wireguard-tools htop openssl

.github/labels.yml

@@ -23,8 +23,6 @@
   color: "959a9c"
 - name: "Closed: ☠️ cannot be done"
   color: "959a9c"
-- name: "Closed: 🤖🍺 drunk AI"
-  color: "959a9c"
 
 - name: "Priority: 🚨 Urgent"
   color: "03adfc"
@@ -128,8 +126,6 @@
   color: "ffc7ea"
 - name: "Category: Firewall ⛓️"
   color: "ffc7ea"
-- name: "Category: MTU discovery 🔦"
-  color: "ffc7ea"
 - name: "Category: Routing 🛤️"
   color: "ffc7ea"
 - name: "Category: IPv6 🛰️"

.github/workflows/ci.yml

@@ -45,7 +45,6 @@ jobs:
           level: error
           exclude: |
             ./internal/storage/servers.json
-            ./.golangci.yml
             *.md
 
       - name: Linting
@@ -138,7 +137,7 @@ jobs:
       # https://github.com/docker/metadata-action
       - name: Extract Docker metadata
         id: meta
-        uses: docker/metadata-action@v6
+        uses: docker/metadata-action@v5
         with:
           flavor: |
             latest=${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) }}
@@ -153,15 +152,15 @@ jobs:
             type=semver,pattern=v{{major}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.') }}
             type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) }}
 
-      - uses: docker/setup-qemu-action@v4
-      - uses: docker/setup-buildx-action@v4
+      - uses: docker/setup-qemu-action@v3
+      - uses: docker/setup-buildx-action@v3
 
-      - uses: docker/login-action@v4
+      - uses: docker/login-action@v3
         with:
           username: qmcgaw
           password: ${{ secrets.DOCKERHUB_PASSWORD }}
 
-      - uses: docker/login-action@v4
+      - uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: qdm12
@@ -169,14 +168,10 @@ jobs:
 
       - name: Short commit
         id: shortcommit
-        run: |
-          # Use the PR head SHA if it exists, otherwise fallback to GITHUB_SHA
-          FULL_SHA="${{ github.event.pull_request.head.sha || github.sha }}"
-          SHORT_SHA=
-          echo "value=$(echo $FULL_SHA | cut -c1-7)" >> $GITHUB_OUTPUT
+        run: echo "::set-output name=value::$(git rev-parse --short HEAD)"
 
       - name: Build and push final image
-        uses: docker/build-push-action@v7
+        uses: docker/build-push-action@v6
         with:
           platforms: linux/amd64,linux/386,linux/arm64,linux/arm/v6,linux/arm/v7,linux/ppc64le
           labels: ${{ steps.meta.outputs.labels }}

.github/workflows/closed-issue.yml

@@ -14,12 +14,8 @@ jobs:
           token: ${{ github.token }}
           issue-number: ${{ github.event.issue.number }}
           body: |
-            Closed issues are **NOT** monitored, so commenting here will likely NOT be seen.
-            If you think this is *still unresolved* and have **more information** to bring, please either
-            re-open this issue or create another issue.
-
-            ❤️😠 temporarily help the Gluetun community and fight the AI slop scam website `gluetun[dot]com` by setting `BORINGPOLL_GLUETUNCOM=on` on the latest image.
-            See [the option in the wiki for more information](https://github.com/qdm12/gluetun-wiki/blob/main/setup/options/others.md)
+            Closed issues are **NOT** monitored, so commenting here is likely to be not seen.
+            If you think this is *still unresolved* and have **more information** to bring, please create another issue.
 
             This is an automated comment setup because @qdm12 is the sole maintainer of this project
-            which became too popular to monitor closed issues.
+            which became too popular to monitor issues closed.

.github/workflows/labels.yml

@@ -12,6 +12,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: crazy-max/ghaction-github-labeler@v6
+      - uses: crazy-max/ghaction-github-labeler@v5
         with:
           yaml-file: .github/labels.yml

.github/workflows/markdown.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - uses: DavidAnson/markdownlint-cli2-action@v22
+      - uses: DavidAnson/markdownlint-cli2-action@v21
         with:
           globs: "**.md"
           config: .markdownlint-cli2.jsonc
@@ -37,7 +37,7 @@ jobs:
           use-quiet-mode: yes
           config-file: .github/workflows/configs/mlc-config.json
 
-      - uses: peter-evans/dockerhub-description@v5
+      - uses: peter-evans/dockerhub-description@v4
         if: github.repository == 'qdm12/gluetun' && github.event_name == 'push'
         with:
           username: qmcgaw

.github/workflows/update-servers-list.yml

@@ -1,98 +0,0 @@
-name: Update servers list
-on:
-  workflow_dispatch:
-    inputs:
-      provider:
-        description: "VPN Provider to update"
-        required: true
-        default: "all"
-        type: choice
-        options:
-          - all
-          - airvpn
-          - cyberghost
-          - expressvpn
-          - fastestvpn
-          - giganews
-          - hidemyass
-          - ipvanish
-          - ivpn
-          - mullvad
-          - nordvpn
-          - perfect privacy
-          - privado
-          - private internet access
-          - privatevpn
-          - protonvpn
-          - purevpn
-          - slickvpn
-          - surfshark
-          - torguard
-          - vpnsecure
-          - vpn unlimited
-          - vyprvpn
-          - windscribe
-  schedule:
-    - cron: "11 3 1 */2 *" # Run at 03:11 on the 1st of every 2nd month
-jobs:
-  update-servers-list:
-    if: github.repository == 'qdm12/gluetun'
-    runs-on: ubuntu-latest
-    permissions:
-      actions: read
-      contents: write
-      pull-requests: write
-    steps:
-      - uses: actions/checkout@v6
-
-      - uses: actions/setup-go@v6
-        with:
-          go-version-file: go.mod
-
-      - name: Update servers list
-        run: |
-          SELECTED_PROVIDER="${{ github.event.inputs.provider || 'all' }}"
-
-          if [ "$SELECTED_PROVIDER" = "all" ]; then
-            FLAGS="-all"
-          else
-            FLAGS="-providers $SELECTED_PROVIDER"
-          fi
-
-          go run ./cmd/gluetun/main.go update $FLAGS \
-            -maintainer \
-            -proton-email "${{ secrets.PROTON_EMAIL }}" \
-            -proton-password "${{ secrets.PROTON_PASSWORD }}"
-
-      - name: Check for changes
-        run: |
-          if git diff --exit-code internal/storage/servers.json >/dev/null; then
-            echo "Error: internal/storage/servers.json was not modified."
-            exit 1
-          fi
-
-      - name: Check no other file changes
-        run: |
-          if ! git diff --exit-code --quiet ':!internal/storage/servers.json'; then
-            echo "Error: Unexpected changes detected in files other than servers.json"
-            git status --short
-            exit 1
-          fi
-
-      - name: Create Pull Request
-        id: createpr
-        uses: peter-evans/create-pull-request@v8
-        with:
-          branch-suffix: timestamp
-          branch: bot/update-servers-list
-          base: master
-          delete-branch: true
-          title: "feat(providers/${{ github.event.inputs.provider || 'all' }}): servers data update"
-          body: |
-            This PR was automatically generated by the [Update servers list](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}) workflow run.
-
-      # - name: Merge Pull Request
-      #   env:
-      #     GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      #   run: |
-      #     gh pr merge ${{ steps.createpr.outputs.pull-request-number }} --auto -m -d

.gitignore

@@ -1,2 +1 @@
 scratch.txt
-.DS_Store

.golangci.yml

@@ -22,7 +22,6 @@ linters:
         - "^disabled$"
         # Firewall and routing strings
         - "^(ACCEPT|DROP)$"
-        - "^--append$"
         - "^--delete$"
         - "^all$"
         - "^(tcp|udp)$"
@@ -48,7 +47,7 @@ linters:
         path: internal\/server\/.+\.go
       - linters:
           - ireturn
-        text: returns interface \(golang\.org\/x\/sys\/unix\.Sockaddr\)
+        text: returns interface \(github\.com\/vishvananda\/netlink\.Link\)
       - linters:
           - ireturn
         path: internal\/openvpn\/pkcs8\/descbc\.go
@@ -60,10 +59,6 @@ linters:
       - linters:
           - lll
         source: "^// https://.+$"
-      - linters:
-          - mnd
-        source: "^	cleanups\\.Add.+$"
-        path: internal\/(wireguard|amneziawg)\/run\.go
       - linters:
           - err113
           - mnd

Dockerfile

@@ -1,5 +1,5 @@
-ARG ALPINE_VERSION=3.23
-ARG GO_ALPINE_VERSION=3.23
+ARG ALPINE_VERSION=3.22
+ARG GO_ALPINE_VERSION=3.22
 ARG GO_VERSION=1.25
 ARG XCPUTRANSLATE_VERSION=v0.9.0
 ARG GOLANGCI_LINT_VERSION=v2.4.0
@@ -13,7 +13,7 @@ FROM --platform=${BUILDPLATFORM} ghcr.io/qdm12/binpot:mockgen-${MOCKGEN_VERSION}
 FROM --platform=${BUILDPLATFORM} golang:${GO_VERSION}-alpine${GO_ALPINE_VERSION} AS base
 COPY --from=xcputranslate /xcputranslate /usr/local/bin/xcputranslate
 # Note: findutils needed to have xargs support `-d` flag for mocks stage.
-RUN apk --update add git g++ findutils iptables
+RUN apk --update add git g++ findutils
 ENV CGO_ENABLED=0
 COPY --from=golangci-lint /bin /go/bin/golangci-lint
 COPY --from=mockgen /bin /go/bin/mockgen
@@ -110,65 +110,8 @@ ENV VPN_SERVICE_PROVIDER=pia \
     WIREGUARD_PERSISTENT_KEEPALIVE_INTERVAL=0 \
     WIREGUARD_ADDRESSES= \
     WIREGUARD_ADDRESSES_SECRETFILE=/run/secrets/wireguard_addresses \
-    WIREGUARD_MTU= \
+    WIREGUARD_MTU=1320 \
     WIREGUARD_IMPLEMENTATION=auto \
-    # Amnezia
-    AMNEZIAWG_ENDPOINT_IP= \
-    AMNEZIAWG_ENDPOINT_PORT= \
-    AMNEZIAWG_CONF_SECRETFILE=/run/secrets/wg0.conf \
-    AMNEZIAWG_PRIVATE_KEY= \
-    AMNEZIAWG_PRIVATE_KEY_SECRETFILE=/run/secrets/wireguard_private_key \
-    AMNEZIAWG_PRESHARED_KEY= \
-    AMNEZIAWG_PRESHARED_KEY_SECRETFILE=/run/secrets/wireguard_preshared_key \
-    AMNEZIAWG_PUBLIC_KEY= \
-    AMNEZIAWG_ALLOWED_IPS= \
-    AMNEZIAWG_PERSISTENT_KEEPALIVE_INTERVAL=0 \
-    AMNEZIAWG_ADDRESSES= \
-    AMNEZIAWG_ADDRESSES_SECRETFILE=/run/secrets/wireguard_addresses \
-    AMNEZIAWG_MTU= \
-    AMNEZIAWG_JC=0 \
-    AMNEZIAWG_JMIN=0 \
-    AMNEZIAWG_JMAX=0 \
-    AMNEZIAWG_S1=0 \
-    AMNEZIAWG_S2=0 \
-    AMNEZIAWG_S3=0 \
-    AMNEZIAWG_S4=0 \
-    AMNEZIAWG_H1= \
-    AMNEZIAWG_H2= \
-    AMNEZIAWG_H3= \
-    AMNEZIAWG_H4= \
-    AMNEZIAWG_I1= \
-    AMNEZIAWG_I2= \
-    AMNEZIAWG_I3= \
-    AMNEZIAWG_I4= \
-    AMNEZIAWG_I5= \
-    # Wireguard AmneziaWG userspace obfuscation (requires WIREGUARD_IMPLEMENTATION=amneziawg)
-    AMNEZIAWG_JC=0 \
-    AMNEZIAWG_JMIN=0 \
-    AMNEZIAWG_JMAX=0 \
-    AMNEZIAWG_S1=0 \
-    AMNEZIAWG_S2=0 \
-    AMNEZIAWG_S3=0 \
-    AMNEZIAWG_S4=0 \
-    AMNEZIAWG_H1= \
-    AMNEZIAWG_H2= \
-    AMNEZIAWG_H3= \
-    AMNEZIAWG_H4= \
-    AMNEZIAWG_I1= \
-    AMNEZIAWG_I2= \
-    AMNEZIAWG_I3= \
-    AMNEZIAWG_I4= \
-    AMNEZIAWG_I5= \
-    # VPN server port forwarding
-    VPN_PORT_FORWARDING=off \
-    VPN_PORT_FORWARDING_PROVIDER= \
-    VPN_PORT_FORWARDING_UP_COMMAND= \
-    VPN_PORT_FORWARDING_DOWN_COMMAND= \
-    VPN_PORT_FORWARDING_LISTENING_PORT=0 \
-    VPN_PORT_FORWARDING_STATUS_FILE="/tmp/gluetun/forwarded_port" \
-    # PMTUD
-    PMTUD_ICMP_ADDRESSES=1.1.1.1,8.8.8.8 \
-    PMTUD_TCP_ADDRESSES=1.1.1.1:443,8.8.8.8:443,1.1.1.1:53,8.8.8.8:53,[2606:4700:4700::1111]:53,[2001:4860:4860::8888]:53,[2606:4700:4700::1111]:443,[2001:4860:4860::8888]:443 \
     # VPN server filtering
     SERVER_REGIONS= \
     SERVER_COUNTRIES= \
@@ -180,8 +123,14 @@ ENV VPN_SERVICE_PROVIDER=pia \
     OWNED_ONLY=no \
     # # Private Internet Access only:
     PRIVATE_INTERNET_ACCESS_OPENVPN_ENCRYPTION_PRESET= \
+    VPN_PORT_FORWARDING=off \
+    VPN_PORT_FORWARDING_LISTENING_PORT=0 \
+    VPN_PORT_FORWARDING_PROVIDER= \
+    VPN_PORT_FORWARDING_STATUS_FILE="/tmp/gluetun/forwarded_port" \
     VPN_PORT_FORWARDING_USERNAME= \
     VPN_PORT_FORWARDING_PASSWORD= \
+    VPN_PORT_FORWARDING_UP_COMMAND= \
+    VPN_PORT_FORWARDING_DOWN_COMMAND= \
     # # Cyberghost only:
     OPENVPN_CERT= \
     OPENVPN_KEY= \
@@ -213,9 +162,7 @@ ENV VPN_SERVICE_PROVIDER=pia \
     FIREWALL_VPN_INPUT_PORTS= \
     FIREWALL_INPUT_PORTS= \
     FIREWALL_OUTBOUND_SUBNETS= \
-    FIREWALL_IPTABLES_LOG_LEVEL=info \
-    # IPv6
-    IPV6_CHECK_ADDRESSES=[2001:4860:4860::8888]:53,[2606:4700:4700::1111]:53 \
+    FIREWALL_DEBUG=off \
     # Logging
     LOG_LEVEL=info \
     # Health
@@ -225,9 +172,9 @@ ENV VPN_SERVICE_PROVIDER=pia \
     HEALTH_SMALL_CHECK_TYPE=icmp \
     HEALTH_RESTART_VPN=on \
     # DNS
+    DNS_SERVER=on \
     DNS_UPSTREAM_RESOLVER_TYPE=DoT \
-    # Note: DNS_UPSTREAM_RESOLVERS defaults to cloudflare in code if DNS_UPSTREAM_PLAIN_ADDRESSES is empty
-    DNS_UPSTREAM_RESOLVERS= \
+    DNS_UPSTREAM_RESOLVERS=cloudflare \
     DNS_BLOCK_IPS= \
     DNS_BLOCK_IP_PREFIXES= \
     DNS_CACHING=on \
@@ -238,7 +185,8 @@ ENV VPN_SERVICE_PROVIDER=pia \
     DNS_UNBLOCK_HOSTNAMES= \
     DNS_REBINDING_PROTECTION_EXEMPT_HOSTNAMES= \
     DNS_UPDATE_PERIOD=24h \
-    DNS_UPSTREAM_PLAIN_ADDRESSES= \
+    DNS_ADDRESS=127.0.0.1 \
+    DNS_KEEP_NAMESERVER=off \
     # HTTP proxy
     HTTPPROXY= \
     HTTPPROXY_LOG=off \
@@ -280,7 +228,6 @@ ENV VPN_SERVICE_PROVIDER=pia \
     PPROF_HTTP_SERVER_ADDRESS=":6060" \
     # Extras
     VERSION_INFORMATION=on \
-    BORINGPOLL_GLUETUNCOM=off \
     TZ= \
     PUID=1000 \
     PGID=1000

README.md

@@ -2,8 +2,6 @@
 
 ⚠️ This and [gluetun-wiki](https://github.com/qdm12/gluetun-wiki) are the only websites for Gluetun, other websites claiming to be official are scams ⚠️
 
-💁 You can optionally set `BORINGPOLL_GLUETUNCOM=on` to... [poll](./internal/boringpoll/boringpoll.go) that **scammy AI slop** website every few minutes so it costs them too much to keep it up. My gentle email reminders to take it down are being grossly ignored 🤷 This would make me very happy and serve this community.
-
 Lightweight swiss-army-knife-like VPN client to multiple VPN service providers
 
 ![Title image](https://raw.githubusercontent.com/qdm12/gluetun/master/title.svg)
@@ -59,15 +57,14 @@ Lightweight swiss-army-knife-like VPN client to multiple VPN service providers
 
 ## Features
 
-- Based on Alpine 3.23 for a small Docker image of 43.1MB
-- Supports: **AirVPN**, **Cyberghost**, **ExpressVPN**, **FastestVPN**, **Giganews**, **HideMyAss**, **IPVanish**, **IVPN**, **Mullvad** (Wireguard only), **NordVPN**, **Perfect Privacy**, **Privado**, **Private Internet Access**, **PrivateVPN**, **ProtonVPN**, **PureVPN**,  **SlickVPN**, **Surfshark**, **TorGuard**, **VPNSecure.me**, **VPNUnlimited**, **Vyprvpn**, **Windscribe** servers
+- Based on Alpine 3.22 for a small Docker image of 41.1MB
+- Supports: **AirVPN**, **Cyberghost**, **ExpressVPN**, **FastestVPN**, **Giganews**, **HideMyAss**, **IPVanish**, **IVPN**, **Mullvad**, **NordVPN**, **Perfect Privacy**, **Privado**, **Private Internet Access**, **PrivateVPN**, **ProtonVPN**, **PureVPN**,  **SlickVPN**, **Surfshark**, **TorGuard**, **VPNSecure.me**, **VPNUnlimited**, **Vyprvpn**, **Windscribe** servers
 - Supports OpenVPN for all providers listed
 - Supports Wireguard both kernelspace and userspace
   - For **AirVPN**, **FastestVPN**, **Ivpn**, **Mullvad**, **NordVPN**, **Perfect privacy**, **ProtonVPN**, **Surfshark** and **Windscribe**
   - For **Cyberghost**, **Private Internet Access**, **PrivateVPN**, **PureVPN**, **Torguard**, **VPN Unlimited** and **VyprVPN** using [the custom provider](https://github.com/qdm12/gluetun-wiki/blob/main/setup/providers/custom.md)
   - For custom Wireguard configurations using [the custom provider](https://github.com/qdm12/gluetun-wiki/blob/main/setup/providers/custom.md)
   - More in progress, see [#134](https://github.com/qdm12/gluetun/issues/134)
-- Supports AmneziaWG only with the custom provider for now
 - DNS over TLS baked in with service provider(s) of your choice
 - DNS fine blocking of malicious/ads/surveillance hostnames and IP addresses, with live update every 24 hours
 - Choose the vpn network protocol, `udp` or `tcp`

ci/internal/simple.go

@@ -17,7 +17,7 @@ import (
 func ptrTo[T any](v T) *T { return &v }
 
 func simpleTest(ctx context.Context, env []string, logger Logger) error {
-	const timeout = 60 * time.Second
+	const timeout = 30 * time.Second
 	ctx, cancel := context.WithTimeout(ctx, timeout)
 	defer cancel()
 

cmd/gluetun/main.go

@@ -16,10 +16,7 @@ import (
 	_ "time/tzdata"
 
 	_ "github.com/breml/rootcerts"
-	"github.com/qdm12/dns/v2/pkg/doh"
-	dnsprovider "github.com/qdm12/dns/v2/pkg/provider"
 	"github.com/qdm12/gluetun/internal/alpine"
-	"github.com/qdm12/gluetun/internal/boringpoll"
 	"github.com/qdm12/gluetun/internal/cli"
 	"github.com/qdm12/gluetun/internal/command"
 	"github.com/qdm12/gluetun/internal/configuration/settings"
@@ -171,7 +168,7 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 
 	defer fmt.Println(gluetunLogo)
 
-	announcementExp, err := time.Parse(time.RFC3339, "2026-04-30T00:00:00Z")
+	announcementExp, err := time.Parse(time.RFC3339, "2024-12-01T00:00:00Z")
 	if err != nil {
 		return err
 	}
@@ -182,7 +179,7 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 		Version:      buildInfo.Version,
 		Commit:       buildInfo.Commit,
 		Created:      buildInfo.Created,
-		Announcement: "Set BORINGPOLL_GLUETUNCOM=on to help combat AI slop and shutdown that scam website",
+		Announcement: "All control server routes will become private by default after the v3.41.0 release",
 		AnnounceExp:  announcementExp,
 		// Sponsor information
 		PaypalUser:    "qmcgaw",
@@ -210,6 +207,9 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 	netLinker.PatchLoggerLevel(logLevel)
 
 	routingLogger := logger.New(log.SetComponent("routing"))
+	if *allSettings.Firewall.Debug { // To remove in v4
+		routingLogger.Patch(log.SetLevel(log.LevelDebug))
+	}
 	routingConf := routing.New(netLinker, routingLogger)
 
 	defaultRoutes, err := routingConf.DefaultRoutes()
@@ -222,11 +222,11 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 		return err
 	}
 
-	iptablesLogLevel, _ := log.ParseLevel(allSettings.Firewall.Iptables.LogLevel)
-	iptablesLogger := logger.New(log.SetComponent("iptables"), log.SetLevel(iptablesLogLevel))
-
 	firewallLogger := logger.New(log.SetComponent("firewall"))
-	firewallConf, err := firewall.NewConfig(ctx, firewallLogger, iptablesLogger, cmder,
+	if *allSettings.Firewall.Debug { // To remove in v4
+		firewallLogger.Patch(log.SetLevel(log.LevelDebug))
+	}
+	firewallConf, err := firewall.NewConfig(ctx, firewallLogger, cmder,
 		defaultRoutes, localNetworks)
 	if err != nil {
 		return err
@@ -237,10 +237,6 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 		if err != nil {
 			return err
 		}
-		err = netLinker.FlushConntrack()
-		if err != nil {
-			logger.Warnf("flushing conntrack failed: %s", err)
-		}
 	}
 
 	// TODO run this in a loop or in openvpn to reload from file without restarting
@@ -250,13 +246,10 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 		return err
 	}
 
-	ipv6SupportLevel, err := netLinker.FindIPv6SupportLevel(ctx,
-		allSettings.IPv6.CheckAddresses, firewallConf)
+	ipv6Supported, err := netLinker.IsIPv6Supported()
 	if err != nil {
 		return fmt.Errorf("checking for IPv6 support: %w", err)
 	}
-	ipv6Supported := ipv6SupportLevel == netlink.IPv6Supported ||
-		ipv6SupportLevel == netlink.IPv6Internet
 
 	err = allSettings.Validate(storage, ipv6Supported, logger)
 	if err != nil {
@@ -271,7 +264,7 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 
 	puid, pgid := int(*allSettings.System.PUID), int(*allSettings.System.PGID)
 
-	const clientTimeout = 35 * time.Second
+	const clientTimeout = 15 * time.Second
 	httpClient := &http.Client{Timeout: clientTimeout}
 	// Create configurators
 	alpineConf := alpine.New()
@@ -286,7 +279,7 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 	err = printVersions(ctx, logger, []printVersionElement{
 		{name: "Alpine", getVersion: alpineConf.Version},
 		{name: "OpenVPN", getVersion: ovpnVersion},
-		{name: "Firewall", getVersion: firewallConf.Version},
+		{name: "IPtables", getVersion: firewallConf.Version},
 	})
 	if err != nil {
 		return err
@@ -401,8 +394,8 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 	}
 
 	dnsLogger := logger.New(log.SetComponent("dns"))
-	dnsLooper, err := dns.NewLoop(allSettings.DNS, httpClient,
-		dnsLogger, localNetworksToPrefixes(localNetworks))
+	dnsLooper, err := dns.NewLoop(allSettings.DNS, httpClient, firewallConf,
+		dnsLogger)
 	if err != nil {
 		return fmt.Errorf("creating DNS loop: %w", err)
 	}
@@ -435,31 +428,20 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 	go healthcheckServer.Run(healthServerCtx, healthServerDone)
 	healthChecker := healthcheck.NewChecker(healthLogger)
 
-	// Note: we use a separate DoH dialer for the VPN servers data updater, separate from the
-	// main DNS local server to make sure no request is blocked by filters.
-	dohDialer, err := doh.New(doh.Settings{
-		UpstreamResolvers: []dnsprovider.Provider{dnsprovider.Cloudflare(), dnsprovider.Google()},
-	})
-	if err != nil {
-		return fmt.Errorf("creating updater DoH dialer: %w", err)
-	}
 	updaterLogger := logger.New(log.SetComponent("updater"))
 
 	unzipper := unzip.New(httpClient)
-	parallelResolver := resolver.NewParallelResolver(dohDialer)
+	parallelResolver := resolver.NewParallelResolver(allSettings.Updater.DNSAddress)
 	openvpnFileExtractor := extract.New()
 	providers := provider.NewProviders(storage, time.Now, updaterLogger,
 		httpClient, unzipper, parallelResolver, publicIPLooper.Fetcher(),
 		openvpnFileExtractor, allSettings.Updater)
 
-	boringPollLogger := logger.New(log.SetComponent("boring poll"))
-	boringPoll := boringpoll.New(httpClient, boringPollLogger, allSettings.BoringPoll)
-
 	vpnLogger := logger.New(log.SetComponent("vpn"))
-	vpnLooper := vpn.NewLoop(allSettings.VPN, ipv6SupportLevel, allSettings.Firewall.VPNInputPorts,
-		providers, storage, boringPoll, allSettings.Health, healthChecker, healthcheckServer,
-		ovpnConf, netLinker, firewallConf, routingConf, portForwardLooper, cmder, publicIPLooper,
-		dnsLooper, vpnLogger, httpClient, buildInfo, *allSettings.Version.Enabled)
+	vpnLooper := vpn.NewLoop(allSettings.VPN, ipv6Supported, allSettings.Firewall.VPNInputPorts,
+		providers, storage, allSettings.Health, healthChecker, healthcheckServer, ovpnConf, netLinker, firewallConf,
+		routingConf, portForwardLooper, cmder, publicIPLooper, dnsLooper, vpnLogger, httpClient,
+		buildInfo, *allSettings.Version.Enabled)
 	vpnHandler, vpnCtx, vpnDone := goshutdown.NewGoRoutineHandler(
 		"vpn", goroutine.OptionTimeout(time.Second))
 	go vpnLooper.Run(vpnCtx, vpnDone)
@@ -497,7 +479,7 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 	httpServer, err := server.New(httpServerCtx, allSettings.ControlServer,
 		logger.New(log.SetComponent("http server")),
 		buildInfo, vpnLooper, portForwardLooper, dnsLooper, updaterLooper, publicIPLooper,
-		storage, ipv6SupportLevel.IsSupported())
+		storage, ipv6Supported)
 	if err != nil {
 		return fmt.Errorf("setting up control server: %w", err)
 	}
@@ -567,24 +549,13 @@ func printVersions(ctx context.Context, logger infoer,
 	return nil
 }
 
-func localNetworksToPrefixes(localNetworks []routing.LocalNetwork) (prefixes []netip.Prefix) {
-	prefixes = make([]netip.Prefix, len(localNetworks))
-	for i, localNetwork := range localNetworks {
-		prefixes[i] = localNetwork.IPNet
-	}
-	return prefixes
-}
-
 type netLinker interface {
 	Addresser
 	Router
 	Ruler
 	Linker
 	IsWireguardSupported() (ok bool, err error)
-	FindIPv6SupportLevel(ctx context.Context,
-		checkAddresses []netip.AddrPort, firewall netlink.Firewall,
-	) (level netlink.IPv6SupportLevel, err error)
-	FlushConntrack() error
+	IsIPv6Supported() (ok bool, err error)
 	PatchLoggerLevel(level log.Level)
 }
 
@@ -636,8 +607,6 @@ type RunStarter interface {
 	Run(cmd *exec.Cmd) (output string, err error)
 	Start(cmd *exec.Cmd) (stdoutLines, stderrLines <-chan string,
 		waitError <-chan error, err error)
-	RunAndLog(ctx context.Context, commandString string,
-		logger command.Logger) (err error)
 }
 
 const gluetunLogo = `                         @@@

go.mod

@@ -4,35 +4,31 @@ go 1.25.0
 
 require (
 	github.com/ProtonMail/go-srp v0.0.7
-	github.com/amnezia-vpn/amneziawg-go v0.2.16
-	github.com/breml/rootcerts v0.3.4
+	github.com/breml/rootcerts v0.3.3
 	github.com/fatih/color v1.18.0
 	github.com/golang/mock v1.6.0
 	github.com/jsimonetti/rtnetlink v1.4.2
-	github.com/klauspost/compress v1.18.4
+	github.com/klauspost/compress v1.18.1
 	github.com/klauspost/pgzip v1.2.6
 	github.com/mdlayher/genetlink v1.3.2
-	github.com/mdlayher/netlink v1.9.0
 	github.com/pelletier/go-toml/v2 v2.2.4
-	github.com/qdm12/dns/v2 v2.0.0-rc9.0.20260310123525-76fabc2b3294
+	github.com/qdm12/dns/v2 v2.0.0-rc10
 	github.com/qdm12/gosettings v0.4.4
 	github.com/qdm12/goshutdown v0.3.0
-	github.com/qdm12/gosplash v0.2.1-0.20260305164749-b713de4fee6c
+	github.com/qdm12/gosplash v0.2.0
 	github.com/qdm12/gotree v0.3.0
 	github.com/qdm12/log v0.1.0
 	github.com/qdm12/ss-server v0.6.0
 	github.com/stretchr/testify v1.11.1
-	github.com/ti-mo/netfilter v0.5.3
 	github.com/ulikunitz/xz v0.5.15
 	github.com/youmark/pkcs8 v0.0.0-20201027041543-1326539a0a0a
 	golang.org/x/exp v0.0.0-20241009180824-f66d83c29e7c
-	golang.org/x/mod v0.33.0
-	golang.org/x/net v0.51.0
-	golang.org/x/sys v0.42.0
-	golang.org/x/text v0.35.0
+	golang.org/x/net v0.49.0
+	golang.org/x/sys v0.40.0
+	golang.org/x/text v0.33.0
 	golang.zx2c4.com/wireguard v0.0.0-20231211153847-12269c276173
 	golang.zx2c4.com/wireguard/wgctrl v0.0.0-20230429144221-925a1e7659e6
-	gopkg.in/ini.v1 v1.67.1
+	gopkg.in/ini.v1 v1.67.0
 )
 
 require (
@@ -44,8 +40,10 @@ require (
 	github.com/cronokirby/saferith v0.33.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/google/go-cmp v0.7.0 // indirect
+	github.com/josharian/native v1.1.0 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mdlayher/netlink v1.7.2 // indirect
 	github.com/mdlayher/socket v0.5.1 // indirect
 	github.com/miekg/dns v1.1.62 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
@@ -57,9 +55,11 @@ require (
 	github.com/prometheus/procfs v0.15.1 // indirect
 	github.com/qdm12/goservices v0.1.1-0.20251104135713-6bee97bd4978 // indirect
 	github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 // indirect
-	golang.org/x/crypto v0.48.0 // indirect
-	golang.org/x/sync v0.20.0 // indirect
-	golang.org/x/tools v0.42.0 // indirect
+	golang.org/x/crypto v0.47.0 // indirect
+	golang.org/x/mod v0.31.0 // indirect
+	golang.org/x/sync v0.19.0 // indirect
+	golang.org/x/time v0.3.0 // indirect
+	golang.org/x/tools v0.40.0 // indirect
 	golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 // indirect
 	google.golang.org/protobuf v1.35.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect

go.sum

@@ -6,12 +6,10 @@ github.com/ProtonMail/go-crypto v1.3.0-proton h1:tAQKQRZX/73VmzK6yHSCaRUOvS/3OYS
 github.com/ProtonMail/go-crypto v1.3.0-proton/go.mod h1:9whxjD8Rbs29b4XWbB8irEcE8KHMqaR2e7GWU1R+/PE=
 github.com/ProtonMail/go-srp v0.0.7 h1:Sos3Qk+th4tQR64vsxGIxYpN3rdnG9Wf9K4ZloC1JrI=
 github.com/ProtonMail/go-srp v0.0.7/go.mod h1:giCp+7qRnMIcCvI6V6U3S1lDDXDQYx2ewJ6F/9wdlJk=
-github.com/amnezia-vpn/amneziawg-go v0.2.16 h1:XY6HOq/xtqH8ZXMncRWkjFs85EKdN10NLNnw23kTpE0=
-github.com/amnezia-vpn/amneziawg-go v0.2.16/go.mod h1:nRkPpIzjCxMW8pZKXTRkpqAQVlmFJdVOGkeQSC7wbms=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
-github.com/breml/rootcerts v0.3.4 h1:9i7WNl/ctd9OEAOaTfLy//Wrlfxq/tRQ7v4okYFN9Ys=
-github.com/breml/rootcerts v0.3.4/go.mod h1:S/PKh+4d1HUn4HQovEB8hPJZO6pUZYrIhmXBhsegfXw=
+github.com/breml/rootcerts v0.3.3 h1://GnaRtQ/9BY2+GtMk2wtWxVdCRysiaPr5/xBwl7NKw=
+github.com/breml/rootcerts v0.3.3/go.mod h1:S/PKh+4d1HUn4HQovEB8hPJZO6pUZYrIhmXBhsegfXw=
 github.com/bwesterb/go-ristretto v1.2.0/go.mod h1:fUIoIZaG73pV5biE2Blr2xEzDoMj7NFEuV9ekS419A0=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
@@ -22,21 +20,22 @@ github.com/cloudflare/circl v1.6.1 h1:zqIqSPIndyBh1bjLVVDHMPpVKqp8Su/V+6MeDzzQBQ
 github.com/cloudflare/circl v1.6.1/go.mod h1:uddAzsPgqdMAYatqJ0lsjX1oECcQLIlRpzZh3pJrofs=
 github.com/cronokirby/saferith v0.33.0 h1:TgoQlfsD4LIwx71+ChfRcIpjkw+RPOapDEVxa+LhwLo=
 github.com/cronokirby/saferith v0.33.0/go.mod h1:QKJhjoqUtBsXCAVEjw38mFqoi7DebT7kthcD7UzbnoA=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/fatih/color v1.18.0 h1:S8gINlzdQ840/4pfAwic/ZE0djQEH3wM94VfqLTZcOM=
 github.com/fatih/color v1.18.0/go.mod h1:4FelSpRwEGDpQ12mAdzqdOukCy4u8WUtOY6lkT/6HfU=
 github.com/golang/mock v1.6.0 h1:ErTB+efbowRARo13NNdxyJji2egdxLGQhRaY+DUumQc=
 github.com/golang/mock v1.6.0/go.mod h1:p6yTPP+5HYm5mzsMV8JkE6ZKdX+/wYM6Hr+LicevLPs=
-github.com/google/btree v1.1.3 h1:CVpQJjYgC4VbzxeGVHfvZrv1ctoYCAI8vbl07Fcxlyg=
-github.com/google/btree v1.1.3/go.mod h1:qOPhT0dTNdNzV6Z/lhRX0YXUafgPLFUh+gZMl761Gm4=
+github.com/google/btree v1.0.1 h1:gK4Kx5IaGY9CD5sPJ36FHiBJ6ZXl0kilRiiCj+jdYp4=
+github.com/google/btree v1.0.1/go.mod h1:xXMiIv4Fb/0kKde4SpL7qlzvu5cMJDRkFDxJfI9uaxA=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
+github.com/josharian/native v1.1.0 h1:uuaP0hAbW7Y4l0ZRQ6C9zfb7Mg1mbFKry/xzDAfmtLA=
+github.com/josharian/native v1.1.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
 github.com/jsimonetti/rtnetlink v1.4.2 h1:Df9w9TZ3npHTyDn0Ev9e1uzmN2odmXd0QX+J5GTEn90=
 github.com/jsimonetti/rtnetlink v1.4.2/go.mod h1:92s6LJdE+1iOrw+F2/RO7LYI2Qd8pPpFNNUYW06gcoM=
-github.com/klauspost/compress v1.18.4 h1:RPhnKRAQ4Fh8zU2FY/6ZFDwTVTxgJ/EMydqSTzE9a2c=
-github.com/klauspost/compress v1.18.4/go.mod h1:R0h/fSBs8DE4ENlcrlib3PsXS61voFxhIs2DeRhCvJ4=
+github.com/klauspost/compress v1.18.1 h1:bcSGx7UbpBqMChDtsF28Lw6v/G94LPrrbMbdC3JH2co=
+github.com/klauspost/compress v1.18.1/go.mod h1:ZQFFVG+MdnR0P+l6wpXgIL4NTtwiKIdBnrBd8Nrxr+0=
 github.com/klauspost/pgzip v1.2.6 h1:8RXeL5crjEUFnR2/Sn6GJNWtSQ3Dk8pq4CL3jvdDyjU=
 github.com/klauspost/pgzip v1.2.6/go.mod h1:Ch1tH69qFZu15pkjo5kYi6mth2Zzwzt50oCQKQE9RUs=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
@@ -50,8 +49,8 @@ github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWE
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/mdlayher/genetlink v1.3.2 h1:KdrNKe+CTu+IbZnm/GVUMXSqBBLqcGpRDa0xkQy56gw=
 github.com/mdlayher/genetlink v1.3.2/go.mod h1:tcC3pkCrPUGIKKsCsp0B3AdaaKuHtaxoJRz3cc+528o=
-github.com/mdlayher/netlink v1.9.0 h1:G8+GLq2x3v4D4MVIqDdNUhTUC7TKiCy/6MDkmItfKco=
-github.com/mdlayher/netlink v1.9.0/go.mod h1:YBnl5BXsCoRuwBjKKlZ+aYmEoq0r12FDA/3JC+94KDg=
+github.com/mdlayher/netlink v1.7.2 h1:/UtM3ofJap7Vl4QWCPDGXY8d3GIY2UGSDbK+QWmY8/g=
+github.com/mdlayher/netlink v1.7.2/go.mod h1:xraEF7uJbxLhc5fpHL4cPe221LI2bdttWlU+ZGLfQSw=
 github.com/mdlayher/socket v0.5.1 h1:VZaqt6RkGkt2OE9l3GcC6nZkqD3xKeQLyfleW/uBcos=
 github.com/mdlayher/socket v0.5.1/go.mod h1:TjPLHI1UgwEv5J1B5q0zTZq12A/6H7nKmtTanQE37IQ=
 github.com/miekg/dns v1.1.62 h1:cN8OuEF1/x5Rq6Np+h1epln8OiyPWV+lROx9LxcGgIQ=
@@ -74,16 +73,16 @@ github.com/prometheus/common v0.60.1 h1:FUas6GcOw66yB/73KC+BOZoFJmbo/1pojoILArPA
 github.com/prometheus/common v0.60.1/go.mod h1:h0LYf1R1deLSKtD4Vdg8gy4RuOvENW2J/h19V5NADQw=
 github.com/prometheus/procfs v0.15.1 h1:YagwOFzUgYfKKHX6Dr+sHT7km/hxC76UB0learggepc=
 github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoGhij/e3PBqk=
-github.com/qdm12/dns/v2 v2.0.0-rc9.0.20260310123525-76fabc2b3294 h1:adkCP7N9mEHpsKSR/5LToF27qJo0yOufhT5zBdKpyrE=
-github.com/qdm12/dns/v2 v2.0.0-rc9.0.20260310123525-76fabc2b3294/go.mod h1:98foWgXJZ+g8gJIuO+fdO+oWpFei5WShMFTeN4Im2lE=
+github.com/qdm12/dns/v2 v2.0.0-rc10 h1:IyeNEYXfhBsaE1dwxx5eAqdAz1HS98dT+8c7xoKODa0=
+github.com/qdm12/dns/v2 v2.0.0-rc10/go.mod h1:98foWgXJZ+g8gJIuO+fdO+oWpFei5WShMFTeN4Im2lE=
 github.com/qdm12/goservices v0.1.1-0.20251104135713-6bee97bd4978 h1:TRGpCU1l0lNwtogEUSs5U+RFceYxkAJUmrGabno7J5c=
 github.com/qdm12/goservices v0.1.1-0.20251104135713-6bee97bd4978/go.mod h1:D1Po4CRQLYjccnAR2JsVlN1sBMgQrcNLONbvyuzcdTg=
 github.com/qdm12/gosettings v0.4.4 h1:SM6tOZDf6k8qbjWU8KWyBF4mWIixfsKCfh9DGRLHlj4=
 github.com/qdm12/gosettings v0.4.4/go.mod h1:CPrt2YC4UsURTrslmhxocVhMCW03lIrqdH2hzIf5prg=
 github.com/qdm12/goshutdown v0.3.0 h1:pqBpJkdwlZlfTEx4QHtS8u8CXx6pG0fVo6S1N0MpSEM=
 github.com/qdm12/goshutdown v0.3.0/go.mod h1:EqZ46No00kCTZ5qzdd3qIzY6ayhMt24QI8Mh8LVQYmM=
-github.com/qdm12/gosplash v0.2.1-0.20260305164749-b713de4fee6c h1:l8qz53IqEXRGK0X62gWwipG077Fz5eNM7qe4mUbAr/Q=
-github.com/qdm12/gosplash v0.2.1-0.20260305164749-b713de4fee6c/go.mod h1:vgRg8Skq9+RNp1THecwMI7SGsnIwO/NPMfYenNTgpAc=
+github.com/qdm12/gosplash v0.2.0 h1:DOxCEizbW6ZG+FgpH2oK1atT6bM8MHL9GZ2ywSS4zZY=
+github.com/qdm12/gosplash v0.2.0/go.mod h1:k+1PzhO0th9cpX4q2Nneu4xTsndXqrM/x7NTIYmJ4jo=
 github.com/qdm12/gotree v0.3.0 h1:Q9f4C571EFK7ZEsPkEL2oGZX7I+ZhVxhh1ZSydW+5yI=
 github.com/qdm12/gotree v0.3.0/go.mod h1:iz06uXmRR4Aq9v6tX7mosXStO/yGHxRA1hbyD0UVeYw=
 github.com/qdm12/log v0.1.0 h1:jYBd/xscHYpblzZAd2kjZp2YmuYHjAAfbTViJWxoPTw=
@@ -94,39 +93,28 @@ github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 h1:f/FNXud6gA3MNr
 github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3/go.mod h1:HgjTstvQsPGkxUsCd2KWxErBblirPizecHcpD3ffK+s=
 github.com/rogpeppe/go-internal v1.13.1 h1:KvO1DLK/DRN07sQ1LQKScxyZJuNnedQ5/wKSR38lUII=
 github.com/rogpeppe/go-internal v1.13.1/go.mod h1:uMEvuHeurkdAXX61udpOXGD/AzZDWNMNyH2VO9fmH0o=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
-github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
-github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
-github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
-github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
-github.com/ti-mo/netfilter v0.5.3 h1:ikzduvnaUMwre5bhbNwWOd6bjqLMVb33vv0XXbK0xGQ=
-github.com/ti-mo/netfilter v0.5.3/go.mod h1:08SyBCg6hu1qyQk4s3DjjJKNrm3RTb32nm6AzyT972E=
 github.com/ulikunitz/xz v0.5.15 h1:9DNdB5s+SgV3bQ2ApL10xRc35ck0DuIX/isZvIk+ubY=
 github.com/ulikunitz/xz v0.5.15/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
 github.com/youmark/pkcs8 v0.0.0-20201027041543-1326539a0a0a h1:fZHgsYlfvtyqToslyjUt3VOPF4J7aK/3MPcK7xp3PDk=
 github.com/youmark/pkcs8 v0.0.0-20201027041543-1326539a0a0a/go.mod h1:ul22v+Nro/R083muKhosV54bj5niojjWZvU8xrevuH4=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
-go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=
-go.uber.org/atomic v1.11.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200302210943-78000ba7a073/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/crypto v0.7.0/go.mod h1:pYwdfH91IfpZVANVyUOhSIPZaFoJGxTFbZhFTx+dXZU=
-golang.org/x/crypto v0.48.0 h1:/VRzVqiRSggnhY7gNRxPauEQ5Drw9haKdM0jqfcCFts=
-golang.org/x/crypto v0.48.0/go.mod h1:r0kV5h3qnFPlQnBSrULhlsRfryS2pmewsg+XfMgkVos=
+golang.org/x/crypto v0.47.0 h1:V6e3FRj+n4dbpw86FJ8Fv7XVOql7TEwpHapKoMJ/GO8=
+golang.org/x/crypto v0.47.0/go.mod h1:ff3Y9VzzKbwSSEzWqJsJVBnWmRwRSHt/6Op5n9bQc4A=
 golang.org/x/exp v0.0.0-20241009180824-f66d83c29e7c h1:7dEasQXItcW1xKJ2+gg5VOiBnqWrJc+rq0DPKyvvdbY=
 golang.org/x/exp v0.0.0-20241009180824-f66d83c29e7c/go.mod h1:NQtJDoLvd6faHhE7m4T/1IY708gDefGGjR/iUW8yQQ8=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
-golang.org/x/mod v0.33.0 h1:tHFzIWbBifEmbwtGz65eaWyGiGZatSrT9prnU8DbVL8=
-golang.org/x/mod v0.33.0/go.mod h1:swjeQEj+6r7fODbD2cqrnje9PnziFuw4bmLbBZFrQ5w=
+golang.org/x/mod v0.31.0 h1:HaW9xtz0+kOcWKwli0ZXy79Ix+UW/vOfmWI5QVd2tgI=
+golang.org/x/mod v0.31.0/go.mod h1:43JraMp9cGx1Rx3AqioxrbrhNsLl2l/iNAvuBkrezpg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
@@ -134,14 +122,14 @@ golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96b
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
 golang.org/x/net v0.8.0/go.mod h1:QVkue5JL9kW//ek3r6jTKnTFis1tRmNAW2P1shuFdJc=
-golang.org/x/net v0.51.0 h1:94R/GTO7mt3/4wIKpcR5gkGmRLOuE/2hNGeWq/GBIFo=
-golang.org/x/net v0.51.0/go.mod h1:aamm+2QF5ogm02fjy5Bb7CQ0WMt1/WVM7FtyaTLlA9Y=
+golang.org/x/net v0.49.0 h1:eeHFmOGUTtaaPSGNmjBKpbng9MulQsJURQUAfUwY++o=
+golang.org/x/net v0.49.0/go.mod h1:/ysNB2EvaqvesRkuLAyjI1ycPZlQHM3q01F02UY/MV8=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
-golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
+golang.org/x/sync v0.19.0 h1:vV+1eWNmZ5geRlYjzm2adRgW2/mcpevXNg50YZtPCE4=
+golang.org/x/sync v0.19.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -154,8 +142,8 @@ golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.42.0 h1:omrd2nAlyT5ESRdCLYdm3+fMfNFE/+Rf4bDIQImRJeo=
-golang.org/x/sys v0.42.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/sys v0.40.0 h1:DBZZqJ2Rkml6QMQsZywtnjnnGvHza6BTfYFWY9kjEWQ=
+golang.org/x/sys v0.40.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
@@ -165,17 +153,17 @@ golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.8.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
-golang.org/x/text v0.35.0 h1:JOVx6vVDFokkpaq1AEptVzLTpDe9KGpj5tR4/X+ybL8=
-golang.org/x/text v0.35.0/go.mod h1:khi/HExzZJ2pGnjenulevKNX1W67CUy0AsXcNubPGCA=
-golang.org/x/time v0.9.0 h1:EsRrnYcQiGH+5FfbgvV4AP7qEZstoyrHB0DzarOQ4ZY=
-golang.org/x/time v0.9.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
+golang.org/x/text v0.33.0 h1:B3njUFyqtHDUI5jMn1YIr5B0IE2U0qck04r6d4KPAxE=
+golang.org/x/text v0.33.0/go.mod h1:LuMebE6+rBincTi9+xWTY8TztLzKHc/9C1uBCG27+q8=
+golang.org/x/time v0.3.0 h1:rg5rLMjNzMS1RkNLzCG38eapWhnYLFYXDXj2gOlr8j4=
+golang.org/x/time v0.3.0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.1/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
-golang.org/x/tools v0.42.0 h1:uNgphsn75Tdz5Ji2q36v/nsFSfR/9BRFvqhGBaJGd5k=
-golang.org/x/tools v0.42.0/go.mod h1:Ma6lCIwGZvHK6XtgbswSoWroEkhugApmsXyrUmBhfr0=
+golang.org/x/tools v0.40.0 h1:yLkxfA+Qnul4cs9QA3KnlFu0lVmd8JJfoq+E41uSutA=
+golang.org/x/tools v0.40.0/go.mod h1:Ik/tzLRlbscWpqqMRjyWYDisX8bG13FrdXp3o4Sr9lc=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -190,13 +178,12 @@ google.golang.org/protobuf v1.35.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojt
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
-gopkg.in/ini.v1 v1.67.1 h1:tVBILHy0R6e4wkYOn3XmiITt/hEVH4TFMYvAX2Ytz6k=
-gopkg.in/ini.v1 v1.67.1/go.mod h1:x/cyOwCgZqOkJoDIJ3c1KNHMo10+nLGAhh+kn3Zizss=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/ini.v1 v1.67.0 h1:Dgnx+6+nfE+IfzjUEISNeydPJh9AXNNsWbGP9KzCsOA=
+gopkg.in/ini.v1 v1.67.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gvisor.dev/gvisor v0.0.0-20231202080848-1f7806d17489 h1:ze1vwAdliUAr68RQ5NtufWaXaOg8WUO2OACzEV+TNdE=
-gvisor.dev/gvisor v0.0.0-20231202080848-1f7806d17489/go.mod h1:10sU+Uh5KKNv1+2x2A0Gvzt8FjD3ASIhorV3YsauXhk=
+gvisor.dev/gvisor v0.0.0-20230927004350-cbd86285d259 h1:TbRPT0HtzFP3Cno1zZo7yPzEEnfu8EjLfl6IU9VfqkQ=
+gvisor.dev/gvisor v0.0.0-20230927004350-cbd86285d259/go.mod h1:AVgIgHMwK63XvmAzWG9vLQ41YnVHN0du0tEC46fI7yY=
 kernel.org/pub/linux/libs/security/libcap/cap v1.2.70 h1:QnLPkuDWWbD5C+3DUA2IUXai5TK6w2zff+MAGccqdsw=
 kernel.org/pub/linux/libs/security/libcap/cap v1.2.70/go.mod h1:/iBwcj9nbLejQitYvUm9caurITQ6WyNHibJk6Q9fiS4=
 kernel.org/pub/linux/libs/security/libcap/psx v1.2.70 h1:HsB2G/rEQiYyo1bGoQqHZ/Bvd6x1rERQTNdPr1FyWjI=

internal/amneziawg/constructor.go

@@ -1,22 +0,0 @@
-package amneziawg
-
-type Amneziawg struct {
-	logger   Logger
-	settings Settings
-	netlink  NetLinker
-}
-
-func New(settings Settings, netlink NetLinker,
-	logger Logger,
-) (a *Amneziawg, err error) {
-	settings.SetDefaults()
-	if err := settings.Check(); err != nil {
-		return nil, err
-	}
-
-	return &Amneziawg{
-		logger:   logger,
-		settings: settings,
-		netlink:  netlink,
-	}, nil
-}

internal/amneziawg/constructor_test.go

@@ -1,86 +0,0 @@
-package amneziawg
-
-import (
-	"net/netip"
-	"testing"
-
-	"github.com/qdm12/gluetun/internal/wireguard"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-	"golang.zx2c4.com/wireguard/device"
-)
-
-func Test_New(t *testing.T) {
-	t.Parallel()
-
-	const validKeyString = "oMNSf/zJ0pt1ciy+qIRk8Rlyfs9accwuRLnKd85Yl1Q="
-	logger := NewMockLogger(nil)
-	netLinker := NewMockNetLinker(nil)
-
-	testCases := map[string]struct {
-		settings  Settings
-		amneziawg *Amneziawg
-		err       error
-	}{
-		"bad_settings": {
-			settings: Settings{
-				Wireguard: wireguard.Settings{
-					PrivateKey: "",
-				},
-			},
-			err: wireguard.ErrPrivateKeyMissing,
-		},
-		"minimal valid settings": {
-			settings: Settings{
-				Wireguard: wireguard.Settings{
-					PrivateKey: validKeyString,
-					PublicKey:  validKeyString,
-					Endpoint:   netip.AddrPortFrom(netip.AddrFrom4([4]byte{1, 2, 3, 4}), 0),
-					Addresses: []netip.Prefix{
-						netip.PrefixFrom(netip.AddrFrom4([4]byte{5, 6, 7, 8}), 32),
-					},
-					FirewallMark: 100,
-				},
-			},
-			amneziawg: &Amneziawg{
-				logger:  logger,
-				netlink: netLinker,
-				settings: Settings{
-					Wireguard: wireguard.Settings{
-						InterfaceName: "wg0",
-						PrivateKey:    validKeyString,
-						PublicKey:     validKeyString,
-						Endpoint:      netip.AddrPortFrom(netip.AddrFrom4([4]byte{1, 2, 3, 4}), 51820),
-						Addresses: []netip.Prefix{
-							netip.PrefixFrom(netip.AddrFrom4([4]byte{5, 6, 7, 8}), 32),
-						},
-						AllowedIPs: []netip.Prefix{
-							netip.MustParsePrefix("0.0.0.0/0"),
-						},
-						FirewallMark:   100,
-						MTU:            device.DefaultMTU,
-						IPv6:           ptrTo(false),
-						Implementation: "auto",
-					},
-				},
-			},
-		},
-	}
-
-	for name, testCase := range testCases {
-		t.Run(name, func(t *testing.T) {
-			t.Parallel()
-
-			wireguard, err := New(testCase.settings, netLinker, logger)
-
-			if testCase.err != nil {
-				require.Error(t, err)
-				assert.Equal(t, testCase.err.Error(), err.Error())
-			} else {
-				assert.NoError(t, err)
-			}
-
-			assert.Equal(t, testCase.amneziawg, wireguard)
-		})
-	}
-}

internal/amneziawg/helpers_test.go

@@ -1,5 +0,0 @@
-package amneziawg
-
-func ptrTo[T any](v T) *T {
-	return &v
-}

internal/amneziawg/log.go

@@ -1,11 +0,0 @@
-package amneziawg
-
-//go:generate mockgen -destination=log_mock_test.go -package amneziawg . Logger
-
-type Logger interface {
-	Debug(s string)
-	Debugf(format string, args ...interface{})
-	Info(s string)
-	Error(s string)
-	Errorf(format string, args ...interface{})
-}

internal/amneziawg/log_mock_test.go

@@ -1,104 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/qdm12/gluetun/internal/amneziawg (interfaces: Logger)
-
-// Package amneziawg is a generated GoMock package.
-package amneziawg
-
-import (
-	reflect "reflect"
-
-	gomock "github.com/golang/mock/gomock"
-)
-
-// MockLogger is a mock of Logger interface.
-type MockLogger struct {
-	ctrl     *gomock.Controller
-	recorder *MockLoggerMockRecorder
-}
-
-// MockLoggerMockRecorder is the mock recorder for MockLogger.
-type MockLoggerMockRecorder struct {
-	mock *MockLogger
-}
-
-// NewMockLogger creates a new mock instance.
-func NewMockLogger(ctrl *gomock.Controller) *MockLogger {
-	mock := &MockLogger{ctrl: ctrl}
-	mock.recorder = &MockLoggerMockRecorder{mock}
-	return mock
-}
-
-// EXPECT returns an object that allows the caller to indicate expected use.
-func (m *MockLogger) EXPECT() *MockLoggerMockRecorder {
-	return m.recorder
-}
-
-// Debug mocks base method.
-func (m *MockLogger) Debug(arg0 string) {
-	m.ctrl.T.Helper()
-	m.ctrl.Call(m, "Debug", arg0)
-}
-
-// Debug indicates an expected call of Debug.
-func (mr *MockLoggerMockRecorder) Debug(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Debug", reflect.TypeOf((*MockLogger)(nil).Debug), arg0)
-}
-
-// Debugf mocks base method.
-func (m *MockLogger) Debugf(arg0 string, arg1 ...interface{}) {
-	m.ctrl.T.Helper()
-	varargs := []interface{}{arg0}
-	for _, a := range arg1 {
-		varargs = append(varargs, a)
-	}
-	m.ctrl.Call(m, "Debugf", varargs...)
-}
-
-// Debugf indicates an expected call of Debugf.
-func (mr *MockLoggerMockRecorder) Debugf(arg0 interface{}, arg1 ...interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	varargs := append([]interface{}{arg0}, arg1...)
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Debugf", reflect.TypeOf((*MockLogger)(nil).Debugf), varargs...)
-}
-
-// Error mocks base method.
-func (m *MockLogger) Error(arg0 string) {
-	m.ctrl.T.Helper()
-	m.ctrl.Call(m, "Error", arg0)
-}
-
-// Error indicates an expected call of Error.
-func (mr *MockLoggerMockRecorder) Error(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Error", reflect.TypeOf((*MockLogger)(nil).Error), arg0)
-}
-
-// Errorf mocks base method.
-func (m *MockLogger) Errorf(arg0 string, arg1 ...interface{}) {
-	m.ctrl.T.Helper()
-	varargs := []interface{}{arg0}
-	for _, a := range arg1 {
-		varargs = append(varargs, a)
-	}
-	m.ctrl.Call(m, "Errorf", varargs...)
-}
-
-// Errorf indicates an expected call of Errorf.
-func (mr *MockLoggerMockRecorder) Errorf(arg0 interface{}, arg1 ...interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	varargs := append([]interface{}{arg0}, arg1...)
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Errorf", reflect.TypeOf((*MockLogger)(nil).Errorf), varargs...)
-}
-
-// Info mocks base method.
-func (m *MockLogger) Info(arg0 string) {
-	m.ctrl.T.Helper()
-	m.ctrl.Call(m, "Info", arg0)
-}
-
-// Info indicates an expected call of Info.
-func (mr *MockLoggerMockRecorder) Info(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Info", reflect.TypeOf((*MockLogger)(nil).Info), arg0)
-}

internal/amneziawg/netlinker.go

@@ -1,36 +0,0 @@
-package amneziawg
-
-import (
-	"net/netip"
-
-	"github.com/qdm12/gluetun/internal/netlink"
-)
-
-//go:generate mockgen -destination=netlinker_mock_test.go -package amneziawg . NetLinker
-
-type NetLinker interface {
-	AddrReplace(linkIndex uint32, addr netip.Prefix) error
-	Router
-	Ruler
-	Linker
-	IsWireguardSupported() (ok bool, err error)
-}
-
-type Router interface {
-	RouteList(family uint8) (routes []netlink.Route, err error)
-	RouteAdd(route netlink.Route) error
-}
-
-type Ruler interface {
-	RuleAdd(rule netlink.Rule) error
-	RuleDel(rule netlink.Rule) error
-}
-
-type Linker interface {
-	LinkAdd(link netlink.Link) (linkIndex uint32, err error)
-	LinkList() (links []netlink.Link, err error)
-	LinkByName(name string) (link netlink.Link, err error)
-	LinkSetUp(linkIndex uint32) error
-	LinkSetDown(linkIndex uint32) error
-	LinkDel(linkIndex uint32) error
-}

internal/amneziawg/netlinker_mock_test.go

@@ -1,209 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/qdm12/gluetun/internal/amneziawg (interfaces: NetLinker)
-
-// Package amneziawg is a generated GoMock package.
-package amneziawg
-
-import (
-	netip "net/netip"
-	reflect "reflect"
-
-	gomock "github.com/golang/mock/gomock"
-	netlink "github.com/qdm12/gluetun/internal/netlink"
-)
-
-// MockNetLinker is a mock of NetLinker interface.
-type MockNetLinker struct {
-	ctrl     *gomock.Controller
-	recorder *MockNetLinkerMockRecorder
-}
-
-// MockNetLinkerMockRecorder is the mock recorder for MockNetLinker.
-type MockNetLinkerMockRecorder struct {
-	mock *MockNetLinker
-}
-
-// NewMockNetLinker creates a new mock instance.
-func NewMockNetLinker(ctrl *gomock.Controller) *MockNetLinker {
-	mock := &MockNetLinker{ctrl: ctrl}
-	mock.recorder = &MockNetLinkerMockRecorder{mock}
-	return mock
-}
-
-// EXPECT returns an object that allows the caller to indicate expected use.
-func (m *MockNetLinker) EXPECT() *MockNetLinkerMockRecorder {
-	return m.recorder
-}
-
-// AddrReplace mocks base method.
-func (m *MockNetLinker) AddrReplace(arg0 uint32, arg1 netip.Prefix) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "AddrReplace", arg0, arg1)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// AddrReplace indicates an expected call of AddrReplace.
-func (mr *MockNetLinkerMockRecorder) AddrReplace(arg0, arg1 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AddrReplace", reflect.TypeOf((*MockNetLinker)(nil).AddrReplace), arg0, arg1)
-}
-
-// IsWireguardSupported mocks base method.
-func (m *MockNetLinker) IsWireguardSupported() (bool, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "IsWireguardSupported")
-	ret0, _ := ret[0].(bool)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// IsWireguardSupported indicates an expected call of IsWireguardSupported.
-func (mr *MockNetLinkerMockRecorder) IsWireguardSupported() *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "IsWireguardSupported", reflect.TypeOf((*MockNetLinker)(nil).IsWireguardSupported))
-}
-
-// LinkAdd mocks base method.
-func (m *MockNetLinker) LinkAdd(arg0 netlink.Link) (uint32, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "LinkAdd", arg0)
-	ret0, _ := ret[0].(uint32)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// LinkAdd indicates an expected call of LinkAdd.
-func (mr *MockNetLinkerMockRecorder) LinkAdd(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LinkAdd", reflect.TypeOf((*MockNetLinker)(nil).LinkAdd), arg0)
-}
-
-// LinkByName mocks base method.
-func (m *MockNetLinker) LinkByName(arg0 string) (netlink.Link, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "LinkByName", arg0)
-	ret0, _ := ret[0].(netlink.Link)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// LinkByName indicates an expected call of LinkByName.
-func (mr *MockNetLinkerMockRecorder) LinkByName(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LinkByName", reflect.TypeOf((*MockNetLinker)(nil).LinkByName), arg0)
-}
-
-// LinkDel mocks base method.
-func (m *MockNetLinker) LinkDel(arg0 uint32) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "LinkDel", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// LinkDel indicates an expected call of LinkDel.
-func (mr *MockNetLinkerMockRecorder) LinkDel(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LinkDel", reflect.TypeOf((*MockNetLinker)(nil).LinkDel), arg0)
-}
-
-// LinkList mocks base method.
-func (m *MockNetLinker) LinkList() ([]netlink.Link, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "LinkList")
-	ret0, _ := ret[0].([]netlink.Link)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// LinkList indicates an expected call of LinkList.
-func (mr *MockNetLinkerMockRecorder) LinkList() *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LinkList", reflect.TypeOf((*MockNetLinker)(nil).LinkList))
-}
-
-// LinkSetDown mocks base method.
-func (m *MockNetLinker) LinkSetDown(arg0 uint32) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "LinkSetDown", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// LinkSetDown indicates an expected call of LinkSetDown.
-func (mr *MockNetLinkerMockRecorder) LinkSetDown(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LinkSetDown", reflect.TypeOf((*MockNetLinker)(nil).LinkSetDown), arg0)
-}
-
-// LinkSetUp mocks base method.
-func (m *MockNetLinker) LinkSetUp(arg0 uint32) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "LinkSetUp", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// LinkSetUp indicates an expected call of LinkSetUp.
-func (mr *MockNetLinkerMockRecorder) LinkSetUp(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LinkSetUp", reflect.TypeOf((*MockNetLinker)(nil).LinkSetUp), arg0)
-}
-
-// RouteAdd mocks base method.
-func (m *MockNetLinker) RouteAdd(arg0 netlink.Route) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "RouteAdd", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// RouteAdd indicates an expected call of RouteAdd.
-func (mr *MockNetLinkerMockRecorder) RouteAdd(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RouteAdd", reflect.TypeOf((*MockNetLinker)(nil).RouteAdd), arg0)
-}
-
-// RouteList mocks base method.
-func (m *MockNetLinker) RouteList(arg0 byte) ([]netlink.Route, error) {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "RouteList", arg0)
-	ret0, _ := ret[0].([]netlink.Route)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// RouteList indicates an expected call of RouteList.
-func (mr *MockNetLinkerMockRecorder) RouteList(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RouteList", reflect.TypeOf((*MockNetLinker)(nil).RouteList), arg0)
-}
-
-// RuleAdd mocks base method.
-func (m *MockNetLinker) RuleAdd(arg0 netlink.Rule) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "RuleAdd", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// RuleAdd indicates an expected call of RuleAdd.
-func (mr *MockNetLinkerMockRecorder) RuleAdd(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RuleAdd", reflect.TypeOf((*MockNetLinker)(nil).RuleAdd), arg0)
-}
-
-// RuleDel mocks base method.
-func (m *MockNetLinker) RuleDel(arg0 netlink.Rule) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "RuleDel", arg0)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// RuleDel indicates an expected call of RuleDel.
-func (mr *MockNetLinkerMockRecorder) RuleDel(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RuleDel", reflect.TypeOf((*MockNetLinker)(nil).RuleDel), arg0)
-}

internal/amneziawg/run.go

@@ -1,133 +0,0 @@
-package amneziawg
-
-import (
-	"context"
-	"errors"
-	"fmt"
-	"net"
-
-	amneziaconn "github.com/amnezia-vpn/amneziawg-go/conn"
-	amneziadevice "github.com/amnezia-vpn/amneziawg-go/device"
-	amneziatun "github.com/amnezia-vpn/amneziawg-go/tun"
-	"github.com/qdm12/gluetun/internal/cleanup"
-	"github.com/qdm12/gluetun/internal/wireguard"
-)
-
-var (
-	errTunNameMismatch = errors.New("TUN device name is mismatching")
-	errDeviceWaited    = errors.New("device waited for")
-)
-
-// Run runs the amneziawg interface and waits until the context is done, then it cleans up the
-// interface and returns any error that occurred during setup or waiting. It sends an error to
-// waitError if any error occurs during setup or waiting, otherwise it sends nil when the context
-// is done. It sends a signal to ready when the setup is complete and the interface is ready to use.
-// See https://github.com/amnezia-vpn/amneziawg-go/blob/master/main.go
-func (a *Amneziawg) Run(ctx context.Context, waitError chan<- error, ready chan<- struct{}) {
-	setup := func(ctx context.Context, cleanups *cleanup.Cleanups) (
-		linkIndex uint32, waitAndCleanup func() error, err error,
-	) {
-		return setupUserspace(ctx, a.settings.Wireguard.InterfaceName,
-			a.netlink, a.settings.Wireguard.MTU, cleanups, a.logger, a.settings)
-	}
-
-	wireguard.Run(ctx, waitError, ready, setup, a.settings.Wireguard, a.netlink, a.logger)
-}
-
-func setupUserspace(ctx context.Context,
-	interfaceName string, netLinker NetLinker, mtu uint32,
-	cleanups *cleanup.Cleanups, logger Logger,
-	settings Settings,
-) (
-	linkIndex uint32, waitAndCleanup func() error, err error,
-) {
-	tun, err := amneziatun.CreateTUN(interfaceName, int(mtu))
-	if err != nil {
-		return 0, nil, fmt.Errorf("creating TUN device: %w", err)
-	}
-
-	cleanups.Add("closing TUN device", 7, tun.Close)
-
-	tunName, err := tun.Name()
-	if err != nil {
-		return 0, nil, fmt.Errorf("getting created TUN device name: %w", err)
-	} else if tunName != interfaceName {
-		return 0, nil, fmt.Errorf("%w: expected %q and got %q",
-			errTunNameMismatch, interfaceName, tunName)
-	}
-
-	link, err := netLinker.LinkByName(interfaceName)
-	if err != nil {
-		return 0, nil, fmt.Errorf("finding link %s: %w", interfaceName, err)
-	}
-	cleanups.Add("deleting link", 5, func() error {
-		return netLinker.LinkDel(link.Index)
-	})
-
-	bind := amneziaconn.NewDefaultBind()
-	cleanups.Add("closing bind", 7, bind.Close)
-
-	deviceLogger := amneziadevice.Logger{
-		Verbosef: logger.Debugf,
-		Errorf:   logger.Errorf,
-	}
-	device := amneziadevice.NewDevice(tun, bind, &deviceLogger)
-
-	cleanups.Add("closing Wireguard device", 6, func() error {
-		device.Close()
-		return nil
-	})
-
-	uapiFile, err := wireguard.UAPIOpen(interfaceName)
-	if err != nil {
-		return 0, nil, fmt.Errorf("opening UAPI socket: %w", err)
-	}
-	cleanups.Add("closing UAPI file", 3, uapiFile.Close)
-
-	uapiListener, err := wireguard.UAPIListen(interfaceName, uapiFile)
-	if err != nil {
-		return 0, nil, fmt.Errorf("listening on UAPI socket: %w", err)
-	}
-	cleanups.Add("closing UAPI listener", 2, uapiListener.Close)
-
-	uapiConfig := settings.uapiConfig()
-	err = device.IpcSet(uapiConfig)
-	if err != nil {
-		return 0, nil, fmt.Errorf("setting amneziawg uapi config: %w", err)
-	}
-
-	// acceptAndHandle exits when uapiListener is closed
-	uapiAcceptErrorCh := make(chan error)
-	go acceptAndHandle(uapiListener, device, uapiAcceptErrorCh)
-	waitAndCleanup = func() error {
-		select {
-		case <-ctx.Done():
-			err = ctx.Err()
-		case err = <-uapiAcceptErrorCh:
-			close(uapiAcceptErrorCh)
-		case <-device.Wait():
-			err = errDeviceWaited
-		}
-
-		cleanups.Cleanup(logger)
-
-		<-uapiAcceptErrorCh // wait for acceptAndHandle to exit
-
-		return err
-	}
-
-	return link.Index, waitAndCleanup, nil
-}
-
-func acceptAndHandle(uapi net.Listener, device *amneziadevice.Device,
-	uapiAcceptErrorCh chan<- error,
-) {
-	for { // stopped by uapiFile.Close()
-		conn, err := uapi.Accept()
-		if err != nil {
-			uapiAcceptErrorCh <- err
-			return
-		}
-		go device.IpcHandle(conn)
-	}
-}

internal/amneziawg/settings.go

@@ -1,69 +0,0 @@
-package amneziawg
-
-import (
-	"fmt"
-	"strings"
-
-	"github.com/qdm12/gluetun/internal/wireguard"
-)
-
-type Settings struct {
-	Wireguard       wireguard.Settings
-	JunkPacketCount uint16
-	JunkPacketMin   uint16
-	JunkPacketMax   uint16
-	PaddingS1       uint16
-	PaddingS2       uint16
-	PaddingS3       uint16
-	PaddingS4       uint16
-	HeaderH1        string
-	HeaderH2        string
-	HeaderH3        string
-	HeaderH4        string
-	InitPacketI1    string
-	InitPacketI2    string
-	InitPacketI3    string
-	InitPacketI4    string
-	InitPacketI5    string
-}
-
-func (s Settings) uapiConfig() string {
-	uintFields := map[string]uint16{
-		"jc":   s.JunkPacketCount,
-		"jmin": s.JunkPacketMin,
-		"jmax": s.JunkPacketMax,
-		"s1":   s.PaddingS1,
-		"s2":   s.PaddingS2,
-		"s3":   s.PaddingS3,
-		"s4":   s.PaddingS4,
-	}
-	stringFields := map[string]string{
-		"h1": s.HeaderH1,
-		"h2": s.HeaderH2,
-		"h3": s.HeaderH3,
-		"h4": s.HeaderH4,
-		"i1": s.InitPacketI1,
-		"i2": s.InitPacketI2,
-		"i3": s.InitPacketI3,
-		"i4": s.InitPacketI4,
-		"i5": s.InitPacketI5,
-	}
-	lines := make([]string, 0, len(uintFields)+len(stringFields))
-
-	for key, val := range uintFields {
-		lines = append(lines, fmt.Sprintf("%s=%d", key, val))
-	}
-
-	for key, val := range stringFields {
-		lines = append(lines, key+"="+val)
-	}
-	return strings.Join(lines, "\n")
-}
-
-func (s *Settings) SetDefaults() {
-	s.Wireguard.SetDefaults()
-}
-
-func (s *Settings) Check() error {
-	return s.Wireguard.Check()
-}

internal/boringpoll/boringpoll.go

@@ -1,188 +0,0 @@
-package boringpoll
-
-import (
-	"context"
-	"fmt"
-	"io"
-	"math/rand"
-	"net/http"
-	"sync"
-	"time"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-)
-
-type BoringPoll struct {
-	// Injected dependencies
-	client *http.Client
-	logger Logger
-
-	// Internal state
-	urlToData map[string]*urlData
-
-	// Internal signals and channels
-	cancel context.CancelFunc
-	done   <-chan struct{}
-	mutex  sync.Mutex
-}
-
-type urlData struct{}
-
-func New(client *http.Client, logger Logger, settings settings.BoringPoll) *BoringPoll {
-	urlToData := make(map[string]*urlData)
-	if *settings.GluetunCom {
-		urlToData["https://gluetun.com/wp-json"] = &urlData{}
-	}
-	return &BoringPoll{
-		client:    client,
-		logger:    logger,
-		urlToData: urlToData,
-	}
-}
-
-func (b *BoringPoll) Start() (runError <-chan error, err error) {
-	b.mutex.Lock()
-	defer b.mutex.Unlock()
-
-	if len(b.urlToData) == 0 {
-		return nil, nil //nolint:nilnil
-	}
-
-	const minPeriod = time.Minute
-	const maxPeriod = 5 * time.Minute
-	const logEveryBytes = 100 * 1000 * 1000 // 100 IEC MB
-
-	var ready, done sync.WaitGroup
-	ready.Add(len(b.urlToData))
-	done.Add(len(b.urlToData))
-	ctx, cancel := context.WithCancel(context.Background())
-	b.cancel = cancel
-	for url := range b.urlToData {
-		go func(url string) {
-			defer done.Done()
-
-			b.logger.Infof("running against %s periodically between %s and %s "+
-				"and will log every %s downloaded",
-				url, minPeriod, maxPeriod, byteCountSI(logEveryBytes))
-			totalDownloaded := uint64(0)
-			lastDownloaded := uint64(0)
-			consecutiveFails := 0
-			const maxConsecutiveErrs = 3
-			const coolDownTimeout = time.Hour
-			timer := time.NewTimer(time.Hour)
-			var err error
-
-			ready.Done()
-			for {
-				timeout := minPeriod + time.Duration(rand.Int63n(int64(maxPeriod-minPeriod))) //nolint:gosec
-				if consecutiveFails >= maxConsecutiveErrs {
-					b.logger.Debugf("pausing poll to %s for %s due to %d consecutive errors, last error: %s",
-						url, coolDownTimeout, consecutiveFails, err)
-					timeout = coolDownTimeout
-				}
-				timer.Reset(timeout)
-				select {
-				case <-ctx.Done():
-					timer.Stop()
-					totalDownloaded += lastDownloaded
-					if totalDownloaded > 0 {
-						b.logger.Infof("stopping poll to %s, downloaded %s!", url, byteCountSI(totalDownloaded))
-					}
-					return
-				case <-timer.C:
-				}
-				var n int64
-				n, err = fetchURL(ctx, b.client, url)
-				if err != nil {
-					consecutiveFails++
-					continue
-				}
-				consecutiveFails = 0
-				totalDownloaded += uint64(n) //nolint:gosec
-				lastDownloaded += uint64(n)  //nolint:gosec
-				if lastDownloaded >= logEveryBytes {
-					b.logger.Infof("thanks for helping! You have downloaded %s from %s so far!",
-						byteCountSI(totalDownloaded), url)
-					lastDownloaded = 0
-				}
-			}
-		}(url)
-	}
-	return nil, nil //nolint:nilnil
-}
-
-func fetchURL(ctx context.Context, client *http.Client, url string) (downloaded int64, err error) {
-	const requestTimeout = 10 * time.Second
-	ctx, cancel := context.WithTimeout(ctx, requestTimeout)
-	defer cancel()
-	request, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
-	if err != nil {
-		cancel()
-		return 0, err
-	}
-	request.Header.Set("Cache-Control", "no-cache, no-store, must-revalidate")
-	request.Header.Set("Pragma", "no-cache")
-	request.Header.Set("Expires", "0")
-	request.Header.Set("User-Agent", getRandomUserAgent())
-
-	response, err := client.Do(request)
-	if err != nil {
-		return 0, err
-	}
-	downloaded, err = io.Copy(io.Discard, response.Body)
-	_ = response.Body.Close()
-	if err != nil {
-		return 0, err
-	}
-	return downloaded, nil
-}
-
-func getRandomUserAgent() string {
-	//nolint:lll
-	userAgents := [...]string{
-		"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36",
-		"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36",
-		"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36",
-		"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:122.0) Gecko/20100101 Firefox/122.0",
-		"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2.1 Safari/605.1.15",
-		"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Edge/121.0.0.0 Safari/537.36",
-		"Mozilla/5.0 (iPhone; CPU iPhone OS 17_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2 Mobile/15E148 Safari/604.1",
-		"Mozilla/5.0 (iPad; CPU OS 17_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2 Mobile/15E148 Safari/604.1",
-		"Mozilla/5.0 (Android 14; Mobile; rv:122.0) Gecko/122.0 Firefox/122.0",
-		"Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Mobile Safari/537.36",
-		"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 OPR/106.0.0.0",
-		"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 OPR/106.0.0.0",
-		"Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)",
-		"Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)",
-	}
-	return userAgents[rand.Intn(len(userAgents))] //nolint:gosec
-}
-
-func (b *BoringPoll) Stop() error {
-	b.mutex.Lock()
-	defer b.mutex.Unlock()
-
-	if b.cancel == nil {
-		return nil
-	}
-	b.cancel()
-	<-b.done
-	b.cancel = nil
-	b.done = nil
-	return nil
-}
-
-func byteCountSI(b uint64) string {
-	const unit = 1000
-	if b < unit {
-		return fmt.Sprintf("%dB", b)
-	}
-
-	div, exp := uint64(unit), 0
-	for n := b / unit; n >= unit; n /= unit {
-		div *= unit
-		exp++
-	}
-
-	return fmt.Sprintf("%.1f%cB", float64(b)/float64(div), "kMGTPE"[exp])
-}

internal/boringpoll/interfaces.go

@@ -1,6 +0,0 @@
-package boringpoll
-
-type Logger interface {
-	Infof(format string, args ...any)
-	Debugf(format string, args ...any)
-}

internal/cleanup/cleanup.go

@@ -1,51 +0,0 @@
-package cleanup
-
-import "sort"
-
-type Cleanups []cleanup
-
-type cleanup struct {
-	operation  string
-	orderIndex uint
-	cleanup    func() error
-	done       bool
-}
-
-// Add adds a cleanup function to the list of cleanups, with a description of the
-// operation being cleaned up, and an order index that determines the order in which
-// the cleanup functions are run. The lower the order index, the earlier the cleanup
-// function is run.
-func (c *Cleanups) Add(operation string, orderIndex uint,
-	cleanupFunc func() error,
-) {
-	closer := cleanup{
-		operation:  operation,
-		orderIndex: orderIndex,
-		cleanup:    cleanupFunc,
-	}
-	*c = append(*c, closer)
-}
-
-// Cleanup runs the cleanup functions in the order of their orderIndex,
-// and logs any error that occurs during cleanup.
-// It can also be re-called in case a cleanup fails, and already cleaned up
-// functions will not be re-run.
-func (c *Cleanups) Cleanup(logger Logger) {
-	closers := *c
-
-	sort.Slice(closers, func(i, j int) bool {
-		return closers[i].orderIndex < closers[j].orderIndex
-	})
-
-	for i, closer := range closers {
-		if closer.done {
-			continue
-		}
-		closers[i].done = true
-		logger.Debug(closer.operation + "...")
-		err := closer.cleanup()
-		if err != nil {
-			logger.Error("failed " + closer.operation + ": " + err.Error())
-		}
-	}
-}

internal/cleanup/cleanup_test.go

@@ -1,57 +0,0 @@
-package cleanup
-
-import (
-	"errors"
-	"testing"
-
-	"github.com/golang/mock/gomock"
-	"github.com/stretchr/testify/assert"
-)
-
-func Test_Cleanups(t *testing.T) {
-	t.Parallel()
-
-	ctrl := gomock.NewController(t)
-
-	var ACloseCalled, BCloseCalled, CCloseCalled bool
-	var (
-		AErr error
-		BErr = errors.New("B failed")
-		CErr = errors.New("C failed")
-	)
-
-	var cleanups Cleanups
-	cleanups.Add("cleaning up A", 5, func() error {
-		ACloseCalled = true
-		return AErr
-	})
-
-	cleanups.Add("cleaning up B", 3, func() error {
-		BCloseCalled = true
-		return BErr
-	})
-
-	cleanups.Add("cleaning up C", 2, func() error {
-		CCloseCalled = true
-		return CErr
-	})
-
-	logger := NewMockLogger(ctrl)
-	prevCall := logger.EXPECT().Debug("cleaning up C...")
-	prevCall = logger.EXPECT().Error("failed cleaning up C: C failed").After(prevCall)
-	prevCall = logger.EXPECT().Debug("cleaning up B...").After(prevCall)
-	prevCall = logger.EXPECT().Error("failed cleaning up B: B failed").After(prevCall)
-	logger.EXPECT().Debug("cleaning up A...").After(prevCall)
-
-	cleanups.Cleanup(logger)
-
-	cleanups.Cleanup(logger) // run twice should not close already closed
-
-	for _, cleanup := range cleanups {
-		assert.True(t, cleanup.done)
-	}
-
-	assert.True(t, ACloseCalled)
-	assert.True(t, BCloseCalled)
-	assert.True(t, CCloseCalled)
-}

internal/cleanup/interfaces.go

@@ -1,6 +0,0 @@
-package cleanup
-
-type Logger interface {
-	Debug(string)
-	Error(string)
-}

internal/cleanup/mocks_generate_test.go

@@ -1,3 +0,0 @@
-package cleanup
-
-//go:generate mockgen -destination=mocks_test.go -package=$GOPACKAGE . Logger

internal/cleanup/mocks_test.go

@@ -1,58 +0,0 @@
-// Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/qdm12/gluetun/internal/cleanup (interfaces: Logger)
-
-// Package cleanup is a generated GoMock package.
-package cleanup
-
-import (
-	reflect "reflect"
-
-	gomock "github.com/golang/mock/gomock"
-)
-
-// MockLogger is a mock of Logger interface.
-type MockLogger struct {
-	ctrl     *gomock.Controller
-	recorder *MockLoggerMockRecorder
-}
-
-// MockLoggerMockRecorder is the mock recorder for MockLogger.
-type MockLoggerMockRecorder struct {
-	mock *MockLogger
-}
-
-// NewMockLogger creates a new mock instance.
-func NewMockLogger(ctrl *gomock.Controller) *MockLogger {
-	mock := &MockLogger{ctrl: ctrl}
-	mock.recorder = &MockLoggerMockRecorder{mock}
-	return mock
-}
-
-// EXPECT returns an object that allows the caller to indicate expected use.
-func (m *MockLogger) EXPECT() *MockLoggerMockRecorder {
-	return m.recorder
-}
-
-// Debug mocks base method.
-func (m *MockLogger) Debug(arg0 string) {
-	m.ctrl.T.Helper()
-	m.ctrl.Call(m, "Debug", arg0)
-}
-
-// Debug indicates an expected call of Debug.
-func (mr *MockLoggerMockRecorder) Debug(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Debug", reflect.TypeOf((*MockLogger)(nil).Debug), arg0)
-}
-
-// Error mocks base method.
-func (m *MockLogger) Error(arg0 string) {
-	m.ctrl.T.Helper()
-	m.ctrl.Call(m, "Error", arg0)
-}
-
-// Error indicates an expected call of Error.
-func (mr *MockLoggerMockRecorder) Error(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Error", reflect.TypeOf((*MockLogger)(nil).Error), arg0)
-}

internal/cli/noopfirewall.go

@@ -1,14 +0,0 @@
-package cli
-
-import (
-	"context"
-	"net/netip"
-)
-
-type noopFirewall struct{}
-
-func (f *noopFirewall) AcceptOutput(_ context.Context, _, _ string, _ netip.Addr,
-	_ uint16, _ bool,
-) (err error) {
-	return nil
-}

internal/cli/openvpnconfig.go

@@ -11,7 +11,6 @@ import (
 	"github.com/qdm12/gluetun/internal/configuration/settings"
 	"github.com/qdm12/gluetun/internal/constants"
 	"github.com/qdm12/gluetun/internal/models"
-	"github.com/qdm12/gluetun/internal/netlink"
 	"github.com/qdm12/gluetun/internal/openvpn/extract"
 	"github.com/qdm12/gluetun/internal/provider"
 	"github.com/qdm12/gluetun/internal/storage"
@@ -41,9 +40,7 @@ type IPFetcher interface {
 }
 
 type IPv6Checker interface {
-	FindIPv6SupportLevel(ctx context.Context,
-		checkAddresses []netip.AddrPort, firewall netlink.Firewall,
-	) (level netlink.IPv6SupportLevel, err error)
+	IsIPv6Supported() (supported bool, err error)
 }
 
 func (c *CLI) OpenvpnConfig(logger OpenvpnConfigLogger, reader *reader.Reader,
@@ -61,14 +58,12 @@ func (c *CLI) OpenvpnConfig(logger OpenvpnConfigLogger, reader *reader.Reader,
 	}
 	allSettings.SetDefaults()
 
-	ipv6SupportLevel, err := ipv6Checker.FindIPv6SupportLevel(context.Background(),
-		allSettings.IPv6.CheckAddresses, &noopFirewall{})
+	ipv6Supported, err := ipv6Checker.IsIPv6Supported()
 	if err != nil {
 		return fmt.Errorf("checking for IPv6 support: %w", err)
 	}
 
-	err = allSettings.Validate(storage, ipv6SupportLevel.IsSupported(), logger)
-	if err != nil {
+	if err = allSettings.Validate(storage, ipv6Supported, logger); err != nil {
 		return fmt.Errorf("validating settings: %w", err)
 	}
 
@@ -84,13 +79,13 @@ func (c *CLI) OpenvpnConfig(logger OpenvpnConfigLogger, reader *reader.Reader,
 		unzipper, parallelResolver, ipFetcher, openvpnFileExtractor, allSettings.Updater)
 	providerConf := providers.Get(allSettings.VPN.Provider.Name)
 	connection, err := providerConf.GetConnection(
-		allSettings.VPN.Provider.ServerSelection, ipv6SupportLevel == netlink.IPv6Internet)
+		allSettings.VPN.Provider.ServerSelection, ipv6Supported)
 	if err != nil {
 		return err
 	}
 
 	lines := providerConf.OpenVPNConfig(connection,
-		allSettings.VPN.OpenVPN, ipv6SupportLevel.IsSupported())
+		allSettings.VPN.OpenVPN, ipv6Supported)
 
 	fmt.Println(strings.Join(lines, "\n"))
 	return nil

internal/cli/update.go

@@ -10,8 +10,6 @@ import (
 	"strings"
 	"time"
 
-	"github.com/qdm12/dns/v2/pkg/doh"
-	dnsprovider "github.com/qdm12/dns/v2/pkg/provider"
 	"github.com/qdm12/gluetun/internal/configuration/settings"
 	"github.com/qdm12/gluetun/internal/constants"
 	"github.com/qdm12/gluetun/internal/constants/providers"
@@ -40,12 +38,12 @@ type UpdaterLogger interface {
 func (c *CLI) Update(ctx context.Context, args []string, logger UpdaterLogger) error {
 	options := settings.Updater{}
 	var endUserMode, maintainerMode, updateAll bool
-	var dnsServer, csvProviders, ipToken, protonUsername, protonEmail, protonPassword string
+	var csvProviders, ipToken, protonUsername, protonEmail, protonPassword string
 	flagSet := flag.NewFlagSet("update", flag.ExitOnError)
 	flagSet.BoolVar(&endUserMode, "enduser", false, "Write results to /gluetun/servers.json (for end users)")
 	flagSet.BoolVar(&maintainerMode, "maintainer", false,
 		"Write results to ./internal/storage/servers.json to modify the program (for maintainers)")
-	flagSet.StringVar(&dnsServer, "dns", "", "no longer used, your DNS will use DoH with Cloudflare and Google")
+	flagSet.StringVar(&options.DNSAddress, "dns", "8.8.8.8", "DNS resolver address to use")
 	const defaultMinRatio = 0.8
 	flagSet.Float64Var(&options.MinRatio, "minratio", defaultMinRatio,
 		"Minimum ratio of servers to find for the update to succeed")
@@ -60,10 +58,6 @@ func (c *CLI) Update(ctx context.Context, args []string, logger UpdaterLogger) e
 		return err
 	}
 
-	if dnsServer != "" {
-		logger.Warn("The -dns flag is no longer used, your DNS will use DoH with Cloudflare and Google")
-	}
-
 	if !endUserMode && !maintainerMode {
 		return fmt.Errorf("%w", ErrModeUnspecified)
 	}
@@ -103,21 +97,10 @@ func (c *CLI) Update(ctx context.Context, args []string, logger UpdaterLogger) e
 		return fmt.Errorf("creating servers storage: %w", err)
 	}
 
-	dohSettings := doh.Settings{
-		UpstreamResolvers: []dnsprovider.Provider{
-			dnsprovider.Cloudflare(),
-			dnsprovider.Google(),
-		},
-	}
-	dnsDialer, err := doh.New(dohSettings)
-	if err != nil {
-		return fmt.Errorf("creating DoH dialer: %w", err)
-	}
-
 	const clientTimeout = 10 * time.Second
 	httpClient := &http.Client{Timeout: clientTimeout}
 	unzipper := unzip.New(httpClient)
-	parallelResolver := resolver.NewParallelResolver(dnsDialer)
+	parallelResolver := resolver.NewParallelResolver(options.DNSAddress)
 	nameTokenPairs := []api.NameToken{
 		{Name: string(api.IPInfo), Token: ipToken},
 		{Name: string(api.IP2Location)},

internal/command/interfaces.go

@@ -1,6 +0,0 @@
-package command
-
-type Logger interface {
-	Info(s string)
-	Error(s string)
-}

internal/command/split.go

@@ -9,13 +9,13 @@ import (
 )
 
 var (
-	errCommandEmpty            = errors.New("command is empty")
-	errSingleQuoteUnterminated = errors.New("unterminated single-quoted string")
-	errDoubleQuoteUnterminated = errors.New("unterminated double-quoted string")
-	errEscapeUnterminated      = errors.New("unterminated backslash-escape")
+	ErrCommandEmpty            = errors.New("command is empty")
+	ErrSingleQuoteUnterminated = errors.New("unterminated single-quoted string")
+	ErrDoubleQuoteUnterminated = errors.New("unterminated double-quoted string")
+	ErrEscapeUnterminated      = errors.New("unterminated backslash-escape")
 )
 
-// split splits a command string into a slice of arguments.
+// Split splits a command string into a slice of arguments.
 // This is especially important for commands such as:
 // /bin/sh -c "echo hello"
 // which should be split into: ["/bin/sh", "-c", "echo hello"]
@@ -23,9 +23,9 @@ var (
 // It does not support:
 // - the $" quoting style.
 // - expansion (brace, shell or pathname).
-func split(command string) (words []string, err error) {
+func Split(command string) (words []string, err error) {
 	if command == "" {
-		return nil, fmt.Errorf("%w", errCommandEmpty)
+		return nil, fmt.Errorf("%w", ErrCommandEmpty)
 	}
 
 	const bufferSize = 1024
@@ -42,7 +42,7 @@ func split(command string) (words []string, err error) {
 		case character == '\\':
 			// Look ahead to eventually skip an escaped newline
 			if command[startIndex+runeSize:] == "" {
-				return nil, fmt.Errorf("%w: %q", errEscapeUnterminated, command)
+				return nil, fmt.Errorf("%w: %q", ErrEscapeUnterminated, command)
 			}
 			character, runeSize := utf8.DecodeRuneInString(command[startIndex+runeSize:])
 			if character == '\n' {
@@ -119,7 +119,7 @@ func handleDoubleQuoted(input string, startIndex int, buffer *bytes.Buffer) (
 			startIndex = cursor
 		}
 	}
-	return "", 0, fmt.Errorf("%w", errDoubleQuoteUnterminated)
+	return "", 0, fmt.Errorf("%w", ErrDoubleQuoteUnterminated)
 }
 
 func handleSingleQuoted(input string, startIndex int, buffer *bytes.Buffer) (
@@ -127,7 +127,7 @@ func handleSingleQuoted(input string, startIndex int, buffer *bytes.Buffer) (
 ) {
 	closingQuoteIndex := strings.IndexRune(input[startIndex:], '\'')
 	if closingQuoteIndex == -1 {
-		return "", 0, fmt.Errorf("%w", errSingleQuoteUnterminated)
+		return "", 0, fmt.Errorf("%w", ErrSingleQuoteUnterminated)
 	}
 	buffer.WriteString(input[startIndex : startIndex+closingQuoteIndex])
 	const singleQuoteRuneLength = 1
@@ -139,7 +139,7 @@ func handleEscaped(input string, startIndex int, buffer *bytes.Buffer) (
 	word string, newStartIndex int, err error,
 ) {
 	if input[startIndex:] == "" {
-		return "", 0, fmt.Errorf("%w", errEscapeUnterminated)
+		return "", 0, fmt.Errorf("%w", ErrEscapeUnterminated)
 	}
 	character, runeLength := utf8.DecodeRuneInString(input[startIndex:])
 	if character != '\n' { // backslash-escaped newline is ignored

internal/command/split_test.go

@@ -6,7 +6,7 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func Test_split(t *testing.T) {
+func Test_Split(t *testing.T) {
 	t.Parallel()
 
 	testCases := map[string]struct {
@@ -17,7 +17,7 @@ func Test_split(t *testing.T) {
 	}{
 		"empty": {
 			command:    "",
-			errWrapped: errCommandEmpty,
+			errWrapped: ErrCommandEmpty,
 			errMessage: "command is empty",
 		},
 		"concrete_sh_command": {
@@ -74,22 +74,22 @@ func Test_split(t *testing.T) {
 		},
 		"unterminated_single_quote": {
 			command:    "'abc'\\''def",
-			errWrapped: errSingleQuoteUnterminated,
+			errWrapped: ErrSingleQuoteUnterminated,
 			errMessage: `splitting word in "'abc'\\''def": unterminated single-quoted string`,
 		},
 		"unterminated_double_quote": {
 			command:    "\"abc'def",
-			errWrapped: errDoubleQuoteUnterminated,
+			errWrapped: ErrDoubleQuoteUnterminated,
 			errMessage: `splitting word in "\"abc'def": unterminated double-quoted string`,
 		},
 		"unterminated_escape": {
 			command:    "abc\\",
-			errWrapped: errEscapeUnterminated,
+			errWrapped: ErrEscapeUnterminated,
 			errMessage: `splitting word in "abc\\": unterminated backslash-escape`,
 		},
 		"unterminated_escape_only": {
 			command:    "   \\",
-			errWrapped: errEscapeUnterminated,
+			errWrapped: ErrEscapeUnterminated,
 			errMessage: `unterminated backslash-escape: "   \\"`,
 		},
 	}
@@ -98,7 +98,7 @@ func Test_split(t *testing.T) {
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 
-			words, err := split(testCase.command)
+			words, err := Split(testCase.command)
 
 			assert.Equal(t, testCase.words, words)
 			assert.ErrorIs(t, err, testCase.errWrapped)

internal/command/startnlog.go

@@ -1,48 +0,0 @@
-package command
-
-import (
-	"context"
-	"fmt"
-	"os/exec"
-)
-
-func (c *Cmder) RunAndLog(ctx context.Context, command string, logger Logger) (err error) {
-	args, err := split(command)
-	if err != nil {
-		return fmt.Errorf("parsing command: %w", err)
-	}
-
-	cmd := exec.CommandContext(ctx, args[0], args[1:]...) // #nosec G204
-	stdout, stderr, waitError, err := c.Start(cmd)
-	if err != nil {
-		return err
-	}
-
-	streamCtx, streamCancel := context.WithCancel(context.Background())
-	streamDone := make(chan struct{})
-	go streamLines(streamCtx, streamDone, logger, stdout, stderr)
-
-	err = <-waitError
-	streamCancel()
-	<-streamDone
-	return err
-}
-
-func streamLines(ctx context.Context, done chan<- struct{},
-	logger Logger, stdout, stderr <-chan string,
-) {
-	defer close(done)
-
-	var line string
-
-	for {
-		select {
-		case <-ctx.Done():
-			return
-		case line = <-stdout:
-			logger.Info(line)
-		case line = <-stderr:
-			logger.Error(line)
-		}
-	}
-}

internal/configuration/settings/amneziawg.go

@@ -1,243 +0,0 @@
-package settings
-
-import (
-	"errors"
-	"fmt"
-	"strconv"
-	"strings"
-
-	"github.com/qdm12/gosettings"
-	"github.com/qdm12/gosettings/reader"
-	"github.com/qdm12/gotree"
-)
-
-type AmneziaWg struct {
-	// Wireguard contains the configuration for Wireguard, given
-	// AmneziaWg is based on Wireguard
-	Wireguard       Wireguard `json:"wireguard"`
-	JunkPacketCount *uint16   `json:"junk_packet_count"`
-	JunkPacketMin   *uint16   `json:"junk_packet_min"`
-	JunkPacketMax   *uint16   `json:"junk_packet_max"`
-	PaddingS1       *uint16   `json:"padding_s1"`
-	PaddingS2       *uint16   `json:"padding_s2"`
-	PaddingS3       *uint16   `json:"padding_s3"`
-	PaddingS4       *uint16   `json:"padding_s4"`
-	HeaderH1        *string   `json:"header_h1"`
-	HeaderH2        *string   `json:"header_h2"`
-	HeaderH3        *string   `json:"header_h3"`
-	HeaderH4        *string   `json:"header_h4"`
-	InitPacketI1    *string   `json:"init_packet_i1"`
-	InitPacketI2    *string   `json:"init_packet_i2"`
-	InitPacketI3    *string   `json:"init_packet_i3"`
-	InitPacketI4    *string   `json:"init_packet_i4"`
-	InitPacketI5    *string   `json:"init_packet_i5"`
-}
-
-func (a *AmneziaWg) read(r *reader.Reader) (err error) {
-	const amneziawg = true
-	err = a.Wireguard.read(r, amneziawg)
-	if err != nil {
-		return err // do not wrap this error
-	}
-
-	uint16Fields := map[string]**uint16{
-		"AMNEZIAWG_JC":   &a.JunkPacketCount,
-		"AMNEZIAWG_JMIN": &a.JunkPacketMin,
-		"AMNEZIAWG_JMAX": &a.JunkPacketMax,
-		"AMNEZIAWG_S1":   &a.PaddingS1,
-		"AMNEZIAWG_S2":   &a.PaddingS2,
-		"AMNEZIAWG_S3":   &a.PaddingS3,
-		"AMNEZIAWG_S4":   &a.PaddingS4,
-	}
-	for key, dst := range uint16Fields {
-		*dst, err = r.Uint16Ptr(key)
-		if err != nil {
-			return err
-		}
-	}
-	stringFields := map[string]**string{
-		"AMNEZIAWG_H1": &a.HeaderH1,
-		"AMNEZIAWG_H2": &a.HeaderH2,
-		"AMNEZIAWG_H3": &a.HeaderH3,
-		"AMNEZIAWG_H4": &a.HeaderH4,
-		"AMNEZIAWG_I1": &a.InitPacketI1,
-		"AMNEZIAWG_I2": &a.InitPacketI2,
-		"AMNEZIAWG_I3": &a.InitPacketI3,
-		"AMNEZIAWG_I4": &a.InitPacketI4,
-		"AMNEZIAWG_I5": &a.InitPacketI5,
-	}
-	opt := reader.ForceLowercase(false)
-	for key, dst := range stringFields {
-		*dst = r.Get(key, opt)
-	}
-	return nil
-}
-
-func (a AmneziaWg) copy() (copied AmneziaWg) {
-	return AmneziaWg{
-		Wireguard:       a.Wireguard.copy(),
-		JunkPacketCount: gosettings.CopyPointer(a.JunkPacketCount),
-		JunkPacketMin:   gosettings.CopyPointer(a.JunkPacketMin),
-		JunkPacketMax:   gosettings.CopyPointer(a.JunkPacketMax),
-		PaddingS1:       gosettings.CopyPointer(a.PaddingS1),
-		PaddingS2:       gosettings.CopyPointer(a.PaddingS2),
-		PaddingS3:       gosettings.CopyPointer(a.PaddingS3),
-		PaddingS4:       gosettings.CopyPointer(a.PaddingS4),
-		HeaderH1:        gosettings.CopyPointer(a.HeaderH1),
-		HeaderH2:        gosettings.CopyPointer(a.HeaderH2),
-		HeaderH3:        gosettings.CopyPointer(a.HeaderH3),
-		HeaderH4:        gosettings.CopyPointer(a.HeaderH4),
-		InitPacketI1:    gosettings.CopyPointer(a.InitPacketI1),
-		InitPacketI2:    gosettings.CopyPointer(a.InitPacketI2),
-		InitPacketI3:    gosettings.CopyPointer(a.InitPacketI3),
-		InitPacketI4:    gosettings.CopyPointer(a.InitPacketI4),
-		InitPacketI5:    gosettings.CopyPointer(a.InitPacketI5),
-	}
-}
-
-func (a *AmneziaWg) overrideWith(other AmneziaWg) {
-	a.Wireguard.overrideWith(other.Wireguard)
-	a.JunkPacketCount = gosettings.OverrideWithPointer(a.JunkPacketCount, other.JunkPacketCount)
-	a.JunkPacketMin = gosettings.OverrideWithPointer(a.JunkPacketMin, other.JunkPacketMin)
-	a.JunkPacketMax = gosettings.OverrideWithPointer(a.JunkPacketMax, other.JunkPacketMax)
-	a.PaddingS1 = gosettings.OverrideWithPointer(a.PaddingS1, other.PaddingS1)
-	a.PaddingS2 = gosettings.OverrideWithPointer(a.PaddingS2, other.PaddingS2)
-	a.PaddingS3 = gosettings.OverrideWithPointer(a.PaddingS3, other.PaddingS3)
-	a.PaddingS4 = gosettings.OverrideWithPointer(a.PaddingS4, other.PaddingS4)
-	a.HeaderH1 = gosettings.OverrideWithPointer(a.HeaderH1, other.HeaderH1)
-	a.HeaderH2 = gosettings.OverrideWithPointer(a.HeaderH2, other.HeaderH2)
-	a.HeaderH3 = gosettings.OverrideWithPointer(a.HeaderH3, other.HeaderH3)
-	a.HeaderH4 = gosettings.OverrideWithPointer(a.HeaderH4, other.HeaderH4)
-	a.InitPacketI1 = gosettings.OverrideWithPointer(a.InitPacketI1, other.InitPacketI1)
-	a.InitPacketI2 = gosettings.OverrideWithPointer(a.InitPacketI2, other.InitPacketI2)
-	a.InitPacketI3 = gosettings.OverrideWithPointer(a.InitPacketI3, other.InitPacketI3)
-	a.InitPacketI4 = gosettings.OverrideWithPointer(a.InitPacketI4, other.InitPacketI4)
-	a.InitPacketI5 = gosettings.OverrideWithPointer(a.InitPacketI5, other.InitPacketI5)
-}
-
-func (a *AmneziaWg) setDefaults(vpnProvider string) {
-	a.Wireguard.setDefaults(vpnProvider)
-	a.Wireguard.Implementation = "userspace" // unused except in logs
-	a.JunkPacketCount = gosettings.DefaultPointer(a.JunkPacketCount, 0)
-	a.JunkPacketMin = gosettings.DefaultPointer(a.JunkPacketMin, 0)
-	a.JunkPacketMax = gosettings.DefaultPointer(a.JunkPacketMax, 0)
-	a.PaddingS1 = gosettings.DefaultPointer(a.PaddingS1, 0)
-	a.PaddingS2 = gosettings.DefaultPointer(a.PaddingS2, 0)
-	a.PaddingS3 = gosettings.DefaultPointer(a.PaddingS3, 0)
-	a.PaddingS4 = gosettings.DefaultPointer(a.PaddingS4, 0)
-	a.HeaderH1 = gosettings.DefaultPointer(a.HeaderH1, "")
-	a.HeaderH2 = gosettings.DefaultPointer(a.HeaderH2, "")
-	a.HeaderH3 = gosettings.DefaultPointer(a.HeaderH3, "")
-	a.HeaderH4 = gosettings.DefaultPointer(a.HeaderH4, "")
-	a.InitPacketI1 = gosettings.DefaultPointer(a.InitPacketI1, "")
-	a.InitPacketI2 = gosettings.DefaultPointer(a.InitPacketI2, "")
-	a.InitPacketI3 = gosettings.DefaultPointer(a.InitPacketI3, "")
-	a.InitPacketI4 = gosettings.DefaultPointer(a.InitPacketI4, "")
-	a.InitPacketI5 = gosettings.DefaultPointer(a.InitPacketI5, "")
-}
-
-func (a AmneziaWg) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("AmneziaWG settings:")
-	node.AppendNode(a.Wireguard.toLinesNode())
-
-	uintFields := []struct {
-		key string
-		val *uint16
-	}{
-		{"JC", a.JunkPacketCount},
-		{"JMIN", a.JunkPacketMin},
-		{"JMAX", a.JunkPacketMax},
-		{"S1", a.PaddingS1},
-		{"S2", a.PaddingS2},
-		{"S3", a.PaddingS3},
-		{"S4", a.PaddingS4},
-	}
-	for _, f := range uintFields {
-		node.Appendf("%s: %d", f.key, *f.val)
-	}
-
-	stringFields := []struct {
-		key string
-		val *string
-	}{
-		{"H1", a.HeaderH1},
-		{"H2", a.HeaderH2},
-		{"H3", a.HeaderH3},
-		{"H4", a.HeaderH4},
-		{"I1", a.InitPacketI1},
-		{"I2", a.InitPacketI2},
-		{"I3", a.InitPacketI3},
-		{"I4", a.InitPacketI4},
-		{"I5", a.InitPacketI5},
-	}
-	for _, f := range stringFields {
-		node.Appendf("%s: %s", f.key, *f.val)
-	}
-
-	return node
-}
-
-var (
-	ErrAmenziawgImplementationNotValid = errors.New("AmneziaWG implementation is not valid")
-	ErrJunkPacketBounds                = errors.New("junk packet minimum must be lower than or equal to maximum")
-	ErrJunkPacketMinMaxNotSet          = errors.New("junk packet min and max must be set when junk packet count is set")
-	ErrJunkPacketCountNotSet           = errors.New("junk packet count must be set when junk packet min or max is set")
-	ErrHeaderRangeMalformed            = errors.New("header range is malformed")
-)
-
-func (a AmneziaWg) validate(vpnProvider string, ipv6Supported bool) error {
-	const amneziaWG = true
-	err := a.Wireguard.validate(vpnProvider, ipv6Supported, amneziaWG)
-	if err != nil {
-		return fmt.Errorf("wireguard settings: %w", err)
-	}
-
-	if *a.JunkPacketCount == 0 {
-		if *a.JunkPacketMin != 0 || *a.JunkPacketMax != 0 {
-			return fmt.Errorf("%w: jc=%d and jmin=%d and jmax=%d",
-				ErrJunkPacketCountNotSet, a.JunkPacketCount, *a.JunkPacketMin, *a.JunkPacketMax)
-		}
-	} else {
-		if *a.JunkPacketMin == 0 || *a.JunkPacketMax == 0 {
-			return fmt.Errorf("%w: jc=%d and jmin=%d and jmax=%d",
-				ErrJunkPacketMinMaxNotSet, a.JunkPacketCount, *a.JunkPacketMin, *a.JunkPacketMax)
-		} else if *a.JunkPacketMin > *a.JunkPacketMax {
-			return fmt.Errorf("%w: jmin=%d and jmax=%d",
-				ErrJunkPacketBounds, *a.JunkPacketMin, *a.JunkPacketMax)
-		}
-	}
-
-	nameToHeaderRange := map[string]string{
-		"h1": *a.HeaderH1,
-		"h2": *a.HeaderH2,
-		"h3": *a.HeaderH3,
-		"h4": *a.HeaderH4,
-	}
-	for name, headerRange := range nameToHeaderRange {
-		if headerRange == "" {
-			continue
-		}
-		fields := strings.Split(headerRange, "-")
-		switch len(fields) {
-		case 1:
-			_, err := strconv.Atoi(fields[0])
-			if err != nil {
-				return fmt.Errorf("%w: %s value %s is not a number",
-					ErrHeaderRangeMalformed, name, headerRange)
-			}
-		case 2: //nolint:mnd
-			for _, field := range fields {
-				_, err := strconv.Atoi(field)
-				if err != nil {
-					return fmt.Errorf("%w: %s value %s is not a valid range",
-						ErrHeaderRangeMalformed, name, headerRange)
-				}
-			}
-		default:
-			return fmt.Errorf("%w: %s value %s must be in the form n or n-m",
-				ErrHeaderRangeMalformed, name, headerRange)
-		}
-	}
-
-	return nil
-}

internal/configuration/settings/boringpoll.go

@@ -1,51 +0,0 @@
-package settings
-
-import (
-	"github.com/qdm12/gosettings"
-	"github.com/qdm12/gosettings/reader"
-	"github.com/qdm12/gotree"
-)
-
-type BoringPoll struct {
-	GluetunCom *bool
-}
-
-func (b BoringPoll) validate() error {
-	return nil
-}
-
-func (b BoringPoll) Copy() BoringPoll {
-	return BoringPoll{
-		GluetunCom: gosettings.CopyPointer(b.GluetunCom),
-	}
-}
-
-func (b *BoringPoll) overrideWith(other BoringPoll) {
-	b.GluetunCom = gosettings.OverrideWithPointer(b.GluetunCom, other.GluetunCom)
-}
-
-func (b *BoringPoll) setDefaults() {
-	b.GluetunCom = gosettings.DefaultPointer(b.GluetunCom, false)
-}
-
-func (b BoringPoll) String() string {
-	return b.toLinesNode().String()
-}
-
-func (b BoringPoll) toLinesNode() *gotree.Node {
-	if !*b.GluetunCom {
-		return nil
-	}
-
-	node := gotree.New("Boring-poll settings:")
-	node.Append("gluetun.com: on")
-	return node
-}
-
-func (b *BoringPoll) read(r *reader.Reader) (err error) {
-	b.GluetunCom, err = r.BoolPtr("BORINGPOLL_GLUETUNCOM")
-	if err != nil {
-		return err
-	}
-	return nil
-}

internal/configuration/settings/deprecated.go

@@ -14,10 +14,6 @@ func readObsolete(r *reader.Reader) (warnings []string) {
 		"DOT_VALIDATION_LOGLEVEL":      "DOT_VALIDATION_LOGLEVEL is obsolete because DNSSEC validation is not implemented.",
 		"HEALTH_VPN_DURATION_INITIAL":  "HEALTH_VPN_DURATION_INITIAL is obsolete",
 		"HEALTH_VPN_DURATION_ADDITION": "HEALTH_VPN_DURATION_ADDITION is obsolete",
-		"DNS_SERVER":                   "DNS_SERVER is obsolete because the forwarding server is always enabled.",
-		"DOT":                          "DOT is obsolete because the forwarding server is always enabled.",
-		"DNS_KEEP_NAMESERVER": "DNS_KEEP_NAMESERVER is obsolete because the forwarding server is always used and " +
-			"forwards local names to private DNS resolvers found in /etc/resolv.conf",
 	}
 	sortedKeys := maps.Keys(keyToMessage)
 	slices.Sort(sortedKeys)

internal/configuration/settings/dns.go

@@ -13,25 +13,20 @@ import (
 	"github.com/qdm12/gotree"
 )
 
-const (
-	DNSUpstreamTypeDot   = "dot"
-	DNSUpstreamTypeDoh   = "doh"
-	DNSUpstreamTypePlain = "plain"
-)
-
 // DNS contains settings to configure DNS.
 type DNS struct {
-	// UpstreamType can be [DNSUpstreamTypeDot], [DNSUpstreamTypeDoh]
-	// or [DNSUpstreamTypePlain]. It defaults to [DNSUpstreamTypeDot].
+	// ServerEnabled is true if the server should be running
+	// and used. It defaults to true, and cannot be nil
+	// in the internal state.
+	ServerEnabled *bool
+	// UpstreamType can be dot or plain, and defaults to dot.
 	UpstreamType string `json:"upstream_type"`
 	// UpdatePeriod is the period to update DNS block lists.
 	// It can be set to 0 to disable the update.
 	// It defaults to 24h and cannot be nil in
 	// the internal state.
 	UpdatePeriod *time.Duration
-	// Providers is a list of DNS providers.
-	// It defaults to ["cloudflare"] and is ignored if the UpstreamType is
-	// [DNSUpstreamTypePlain] and the UpstreamPlainAddresses field is set.
+	// Providers is a list of DNS providers
 	Providers []string `json:"providers"`
 	// Caching is true if the server should cache
 	// DNS responses.
@@ -41,22 +36,32 @@ type DNS struct {
 	// Blacklist contains settings to configure the filter
 	// block lists.
 	Blacklist DNSBlacklist
-	// UpstreamPlainAddresses are the upstream plaintext DNS resolver
-	// addresses to use by the built-in DNS server forwarder.
-	// Note, if the upstream type is [dnsUpstreamTypePlain] and this field is set,
-	// the Providers field is ignored.
-	UpstreamPlainAddresses []netip.AddrPort
+	// ServerAddress is the DNS server to use inside
+	// the Go program and for the system.
+	// It defaults to '127.0.0.1' to be used with the
+	// local server. It cannot be the zero value in the internal
+	// state.
+	ServerAddress netip.Addr
+	// KeepNameserver is true if the existing DNS server
+	// found in /etc/resolv.conf should be used
+	// Note setting this to true will likely DNS traffic
+	// outside the VPN tunnel since it would go through
+	// the local DNS server of your Docker/Kubernetes
+	// configuration, which is likely not going through the tunnel.
+	// This will also disable the DNS forwarder server and the
+	// `ServerAddress` field will be ignored.
+	// It defaults to false and cannot be nil in the
+	// internal state.
+	KeepNameserver *bool
 }
 
 var (
 	ErrDNSUpstreamTypeNotValid = errors.New("DNS upstream type is not valid")
 	ErrDNSUpdatePeriodTooShort = errors.New("update period is too short")
-	ErrDNSUpstreamPlainNoIPv6  = errors.New("upstream plain addresses do not contain any IPv6 address")
-	ErrDNSUpstreamPlainNoIPv4  = errors.New("upstream plain addresses do not contain any IPv4 address")
 )
 
 func (d DNS) validate() (err error) {
-	if !helpers.IsOneOf(d.UpstreamType, DNSUpstreamTypeDot, DNSUpstreamTypeDoh, DNSUpstreamTypePlain) {
+	if !helpers.IsOneOf(d.UpstreamType, "dot", "doh", "plain") {
 		return fmt.Errorf("%w: %s", ErrDNSUpstreamTypeNotValid, d.UpstreamType)
 	}
 
@@ -66,27 +71,13 @@ func (d DNS) validate() (err error) {
 			ErrDNSUpdatePeriodTooShort, *d.UpdatePeriod, minUpdatePeriod)
 	}
 
-	if d.UpstreamType == DNSUpstreamTypePlain {
-		selectedHasPlainIPv4, selectedHasPlainIPv6 := false, false
-		for _, addrPort := range d.UpstreamPlainAddresses {
-			if !selectedHasPlainIPv4 && addrPort.Addr().Is4() {
-				selectedHasPlainIPv4 = true
-			}
-			if !selectedHasPlainIPv6 && addrPort.Addr().Is6() {
-				selectedHasPlainIPv6 = true
-			}
-			if selectedHasPlainIPv4 && selectedHasPlainIPv6 {
-				break
-			}
-		}
-		switch {
-		case *d.IPv6 && !selectedHasPlainIPv6:
-			return fmt.Errorf("%w: in %d addresses", ErrDNSUpstreamPlainNoIPv6, len(d.UpstreamPlainAddresses))
-		case !*d.IPv6 && !selectedHasPlainIPv4:
-			return fmt.Errorf("%w: in %d addresses", ErrDNSUpstreamPlainNoIPv4, len(d.UpstreamPlainAddresses))
+	providers := provider.NewProviders()
+	for _, providerName := range d.Providers {
+		_, err := providers.Get(providerName)
+		if err != nil {
+			return err
 		}
 	}
-	// Note: all DNS built in providers have both IPv4 and IPv6 addresses for all modes
 
 	err = d.Blacklist.validate()
 	if err != nil {
@@ -98,13 +89,15 @@ func (d DNS) validate() (err error) {
 
 func (d *DNS) Copy() (copied DNS) {
 	return DNS{
-		UpstreamType:           d.UpstreamType,
-		UpdatePeriod:           gosettings.CopyPointer(d.UpdatePeriod),
-		Providers:              gosettings.CopySlice(d.Providers),
-		Caching:                gosettings.CopyPointer(d.Caching),
-		IPv6:                   gosettings.CopyPointer(d.IPv6),
-		Blacklist:              d.Blacklist.copy(),
-		UpstreamPlainAddresses: gosettings.CopySlice(d.UpstreamPlainAddresses),
+		ServerEnabled:  gosettings.CopyPointer(d.ServerEnabled),
+		UpstreamType:   d.UpstreamType,
+		UpdatePeriod:   gosettings.CopyPointer(d.UpdatePeriod),
+		Providers:      gosettings.CopySlice(d.Providers),
+		Caching:        gosettings.CopyPointer(d.Caching),
+		IPv6:           gosettings.CopyPointer(d.IPv6),
+		Blacklist:      d.Blacklist.copy(),
+		ServerAddress:  d.ServerAddress,
+		KeepNameserver: gosettings.CopyPointer(d.KeepNameserver),
 	}
 }
 
@@ -112,70 +105,48 @@ func (d *DNS) Copy() (copied DNS) {
 // settings object with any field set in the other
 // settings.
 func (d *DNS) overrideWith(other DNS) {
+	d.ServerEnabled = gosettings.OverrideWithPointer(d.ServerEnabled, other.ServerEnabled)
 	d.UpstreamType = gosettings.OverrideWithComparable(d.UpstreamType, other.UpstreamType)
 	d.UpdatePeriod = gosettings.OverrideWithPointer(d.UpdatePeriod, other.UpdatePeriod)
 	d.Providers = gosettings.OverrideWithSlice(d.Providers, other.Providers)
 	d.Caching = gosettings.OverrideWithPointer(d.Caching, other.Caching)
 	d.IPv6 = gosettings.OverrideWithPointer(d.IPv6, other.IPv6)
 	d.Blacklist.overrideWith(other.Blacklist)
-	d.UpstreamPlainAddresses = gosettings.OverrideWithSlice(d.UpstreamPlainAddresses, other.UpstreamPlainAddresses)
+	d.ServerAddress = gosettings.OverrideWithValidator(d.ServerAddress, other.ServerAddress)
+	d.KeepNameserver = gosettings.OverrideWithPointer(d.KeepNameserver, other.KeepNameserver)
 }
 
 func (d *DNS) setDefaults() {
-	d.UpstreamType = gosettings.DefaultComparable(d.UpstreamType, DNSUpstreamTypeDot)
+	d.ServerEnabled = gosettings.DefaultPointer(d.ServerEnabled, true)
+	d.UpstreamType = gosettings.DefaultComparable(d.UpstreamType, "dot")
 	const defaultUpdatePeriod = 24 * time.Hour
 	d.UpdatePeriod = gosettings.DefaultPointer(d.UpdatePeriod, defaultUpdatePeriod)
-	d.UpstreamPlainAddresses = gosettings.DefaultSlice(d.UpstreamPlainAddresses, []netip.AddrPort{})
-	d.Providers = gosettings.DefaultSlice(d.Providers, defaultDNSProviders())
+	d.Providers = gosettings.DefaultSlice(d.Providers, []string{
+		provider.Cloudflare().Name,
+	})
 	d.Caching = gosettings.DefaultPointer(d.Caching, true)
 	d.IPv6 = gosettings.DefaultPointer(d.IPv6, false)
 	d.Blacklist.setDefaults()
-}
-
-func defaultDNSProviders() []string {
-	return []string{
-		provider.Cloudflare().Name,
-	}
+	d.ServerAddress = gosettings.DefaultValidator(d.ServerAddress,
+		netip.AddrFrom4([4]byte{127, 0, 0, 1}))
+	d.KeepNameserver = gosettings.DefaultPointer(d.KeepNameserver, false)
 }
 
 func (d DNS) GetFirstPlaintextIPv4() (ipv4 netip.Addr) {
-	if d.UpstreamType == DNSUpstreamTypePlain {
-		for _, addrPort := range d.UpstreamPlainAddresses {
-			if addrPort.Addr().Is4() {
-				return addrPort.Addr()
-			}
-		}
+	localhost := netip.AddrFrom4([4]byte{127, 0, 0, 1})
+	if d.ServerAddress.Compare(localhost) != 0 && d.ServerAddress.Is4() {
+		return d.ServerAddress
 	}
 
-	ipv4 = findPlainIPv4InProviders(d.Providers)
-	if ipv4.IsValid() {
-		return ipv4
-	}
-
-	// Either:
-	// - all upstream plain addresses are IPv6 and no provider is set
-	// - all providers set do not have a plaintext IPv4 address
-	ipv4 = findPlainIPv4InProviders(defaultDNSProviders())
-	if !ipv4.IsValid() {
-		panic("no plaintext IPv4 address found in default DNS providers")
-	}
-	return ipv4
-}
-
-func findPlainIPv4InProviders(providerNames []string) netip.Addr {
 	providers := provider.NewProviders()
-	for _, name := range providerNames {
-		provider, err := providers.Get(name)
-		if err != nil {
-			// Settings should be validated before calling this function,
-			// so an error happening here is a programming error.
-			panic(err)
-		}
-		if len(provider.Plain.IPv4) > 0 {
-			return provider.Plain.IPv4[0].Addr()
-		}
+	provider, err := providers.Get(d.Providers[0])
+	if err != nil {
+		// Settings should be validated before calling this function,
+		// so an error happening here is a programming error.
+		panic(err)
 	}
-	return netip.Addr{}
+
+	return provider.Plain.IPv4[0].Addr()
 }
 
 func (d DNS) String() string {
@@ -184,25 +155,22 @@ func (d DNS) String() string {
 
 func (d DNS) toLinesNode() (node *gotree.Node) {
 	node = gotree.New("DNS settings:")
+	node.Appendf("Keep existing nameserver(s): %s", gosettings.BoolToYesNo(d.KeepNameserver))
+	if *d.KeepNameserver {
+		return node
+	}
+	node.Appendf("DNS server address to use: %s", d.ServerAddress)
+
+	node.Appendf("DNS forwarder server enabled: %s", gosettings.BoolToYesNo(d.ServerEnabled))
+	if !*d.ServerEnabled {
+		return node
+	}
 
 	node.Appendf("Upstream resolver type: %s", d.UpstreamType)
 
 	upstreamResolvers := node.Append("Upstream resolvers:")
-	if len(d.UpstreamPlainAddresses) > 0 {
-		if d.UpstreamType == DNSUpstreamTypePlain {
-			for _, addr := range d.UpstreamPlainAddresses {
-				upstreamResolvers.Append(addr.String())
-			}
-		} else {
-			node.Appendf("Upstream plain addresses: ignored because upstream type is not plain")
-			for _, provider := range d.Providers {
-				upstreamResolvers.Append(provider)
-			}
-		}
-	} else {
-		for _, provider := range d.Providers {
-			upstreamResolvers.Append(provider)
-		}
+	for _, provider := range d.Providers {
+		upstreamResolvers.Append(provider)
 	}
 
 	node.Appendf("Caching: %s", gosettings.BoolToYesNo(d.Caching))
@@ -220,6 +188,11 @@ func (d DNS) toLinesNode() (node *gotree.Node) {
 }
 
 func (d *DNS) read(r *reader.Reader) (err error) {
+	d.ServerEnabled, err = r.BoolPtr("DNS_SERVER", reader.RetroKeys("DOT"))
+	if err != nil {
+		return err
+	}
+
 	d.UpstreamType = r.String("DNS_UPSTREAM_RESOLVER_TYPE")
 
 	d.UpdatePeriod, err = r.DurationPtr("DNS_UPDATE_PERIOD")
@@ -244,42 +217,15 @@ func (d *DNS) read(r *reader.Reader) (err error) {
 		return err
 	}
 
-	err = d.readUpstreamPlainAddresses(r)
+	d.ServerAddress, err = r.NetipAddr("DNS_ADDRESS", reader.RetroKeys("DNS_PLAINTEXT_ADDRESS"))
+	if err != nil {
+		return err
+	}
+
+	d.KeepNameserver, err = r.BoolPtr("DNS_KEEP_NAMESERVER")
 	if err != nil {
 		return err
 	}
 
 	return nil
 }
-
-func (d *DNS) readUpstreamPlainAddresses(r *reader.Reader) (err error) {
-	// If DNS_UPSTREAM_PLAIN_ADDRESSES is set, the user must also set DNS_UPSTREAM_TYPE=plain
-	// for these to be used. This is an added safety measure to reduce misunderstandings, and
-	// reduce odd settings overrides.
-	d.UpstreamPlainAddresses, err = r.CSVNetipAddrPorts("DNS_UPSTREAM_PLAIN_ADDRESSES")
-	if err != nil {
-		return err
-	}
-
-	// Retro-compatibility - remove in v4
-	// If DNS_ADDRESS is set to a non-localhost address, append it to the other
-	// upstream plain addresses, assuming port 53, and force the upstream type to plain
-	// to maintain retro-compatibility behavior.
-	serverAddress, err := r.NetipAddr("DNS_ADDRESS",
-		reader.RetroKeys("DNS_PLAINTEXT_ADDRESS"),
-		reader.IsRetro("DNS_UPSTREAM_PLAIN_ADDRESSES"))
-	if err != nil {
-		return err
-	} else if !serverAddress.IsValid() {
-		return nil
-	}
-	isLocalhost := serverAddress.Compare(netip.AddrFrom4([4]byte{127, 0, 0, 1})) == 0
-	if isLocalhost {
-		return nil
-	}
-	const defaultPlainPort = 53
-	addrPort := netip.AddrPortFrom(serverAddress, defaultPlainPort)
-	d.UpstreamPlainAddresses = append(d.UpstreamPlainAddresses, addrPort)
-	d.UpstreamType = DNSUpstreamTypePlain
-	return nil
-}

internal/configuration/settings/dns_test.go

@@ -1,26 +0,0 @@
-package settings
-
-import (
-	"testing"
-
-	"github.com/qdm12/dns/v2/pkg/provider"
-	"github.com/stretchr/testify/require"
-)
-
-func Test_defaultDNSProviders(t *testing.T) {
-	t.Parallel()
-
-	names := defaultDNSProviders()
-
-	found := false
-	providers := provider.NewProviders()
-	for _, name := range names {
-		provider, err := providers.Get(name)
-		require.NoError(t, err)
-		if len(provider.Plain.IPv4) > 0 {
-			found = true
-			break
-		}
-	}
-	require.True(t, found, "no default DNS provider has a plaintext IPv4 address")
-}

internal/configuration/settings/dnsblacklist.go

@@ -23,9 +23,7 @@ type DNSBlacklist struct {
 	AddBlockedIPs        []netip.Addr
 	AddBlockedIPPrefixes []netip.Prefix
 	// RebindingProtectionExemptHostnames is a list of hostnames
-	// exempt from DNS rebinding protection. It can contain parent
-	// domains which are of the form "*.example.com". Note the wildcard
-	// can only be used at the start of the hostname.
+	// exempt from DNS rebinding protection.
 	RebindingProtectionExemptHostnames []string
 }
 
@@ -57,9 +55,6 @@ func (b DNSBlacklist) validate() (err error) {
 	}
 
 	for _, host := range b.RebindingProtectionExemptHostnames {
-		if len(host) > 2 && host[:2] == "*." {
-			host = host[2:]
-		}
 		if !hostRegex.MatchString(host) {
 			return fmt.Errorf("%w: %s", ErrRebindingProtectionExemptHostNotValid, host)
 		}

internal/configuration/settings/firewall.go

@@ -15,7 +15,7 @@ type Firewall struct {
 	InputPorts      []uint16
 	OutboundSubnets []netip.Prefix
 	Enabled         *bool
-	Iptables        Iptables
+	Debug           *bool
 }
 
 func (f Firewall) validate() (err error) {
@@ -33,11 +33,6 @@ func (f Firewall) validate() (err error) {
 		}
 	}
 
-	err = f.Iptables.validate()
-	if err != nil {
-		return fmt.Errorf("iptables settings: %w", err)
-	}
-
 	return nil
 }
 
@@ -56,7 +51,7 @@ func (f *Firewall) copy() (copied Firewall) {
 		InputPorts:      gosettings.CopySlice(f.InputPorts),
 		OutboundSubnets: gosettings.CopySlice(f.OutboundSubnets),
 		Enabled:         gosettings.CopyPointer(f.Enabled),
-		Iptables:        f.Iptables.copy(),
+		Debug:           gosettings.CopyPointer(f.Debug),
 	}
 }
 
@@ -68,12 +63,12 @@ func (f *Firewall) overrideWith(other Firewall) {
 	f.InputPorts = gosettings.OverrideWithSlice(f.InputPorts, other.InputPorts)
 	f.OutboundSubnets = gosettings.OverrideWithSlice(f.OutboundSubnets, other.OutboundSubnets)
 	f.Enabled = gosettings.OverrideWithPointer(f.Enabled, other.Enabled)
-	f.Iptables.overrideWith(other.Iptables)
+	f.Debug = gosettings.OverrideWithPointer(f.Debug, other.Debug)
 }
 
-func (f *Firewall) setDefaults(globalLogLevel string) {
+func (f *Firewall) setDefaults() {
 	f.Enabled = gosettings.DefaultPointer(f.Enabled, true)
-	f.Iptables.setDefaults(globalLogLevel)
+	f.Debug = gosettings.DefaultPointer(f.Debug, false)
 }
 
 func (f Firewall) String() string {
@@ -88,7 +83,9 @@ func (f Firewall) toLinesNode() (node *gotree.Node) {
 		return node
 	}
 
-	node.AppendNode(f.Iptables.toLinesNode())
+	if *f.Debug {
+		node.Appendf("Debug mode: on")
+	}
 
 	if len(f.VPNInputPorts) > 0 {
 		vpnInputPortsNode := node.Appendf("VPN input ports:")
@@ -136,9 +133,9 @@ func (f *Firewall) read(r *reader.Reader) (err error) {
 		return err
 	}
 
-	err = f.Iptables.read(r)
+	f.Debug, err = r.BoolPtr("FIREWALL_DEBUG")
 	if err != nil {
-		return fmt.Errorf("reading iptables settings: %w", err)
+		return err
 	}
 
 	return nil

internal/configuration/settings/firewall_test.go

@@ -4,7 +4,6 @@ import (
 	"net/netip"
 	"testing"
 
-	"github.com/qdm12/log"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -16,10 +15,7 @@ func Test_Firewall_validate(t *testing.T) {
 		errWrapped error
 		errMessage string
 	}{
-		"empty": {
-			errWrapped: log.ErrLevelNotRecognized,
-			errMessage: "iptables settings: log level: level is not recognized: ",
-		},
+		"empty": {},
 		"zero_vpn_input_port": {
 			firewall: Firewall{
 				VPNInputPorts: []uint16{0},
@@ -45,7 +41,6 @@ func Test_Firewall_validate(t *testing.T) {
 		},
 		"public_outbound_subnet": {
 			firewall: Firewall{
-				Iptables: Iptables{LogLevel: log.LevelInfo.String()},
 				OutboundSubnets: []netip.Prefix{
 					netip.MustParsePrefix("1.2.3.4/32"),
 				},
@@ -53,7 +48,6 @@ func Test_Firewall_validate(t *testing.T) {
 		},
 		"valid_settings": {
 			firewall: Firewall{
-				Iptables:      Iptables{LogLevel: log.LevelInfo.String()},
 				VPNInputPorts: []uint16{100, 101},
 				InputPorts:    []uint16{200, 201},
 				OutboundSubnets: []netip.Prefix{

internal/configuration/settings/iptables.go

@@ -1,67 +0,0 @@
-package settings
-
-import (
-	"fmt"
-
-	"github.com/qdm12/gosettings"
-	"github.com/qdm12/gosettings/reader"
-	"github.com/qdm12/gotree"
-	"github.com/qdm12/log"
-)
-
-// Iptables contains settings to customize iptables.
-type Iptables struct {
-	LogLevel string
-}
-
-func (i Iptables) validate() (err error) {
-	_, err = log.ParseLevel(i.LogLevel)
-	if err != nil {
-		return fmt.Errorf("log level: %w", err)
-	}
-
-	return nil
-}
-
-func (i *Iptables) copy() (copied Iptables) {
-	return Iptables{
-		LogLevel: i.LogLevel,
-	}
-}
-
-func (i *Iptables) overrideWith(other Iptables) {
-	i.LogLevel = gosettings.OverrideWithComparable(i.LogLevel, other.LogLevel)
-}
-
-func (i *Iptables) setDefaults(globalLogLevel string) {
-	defaultLevel := globalLogLevel
-	if defaultLevel == log.LevelDebug.String() {
-		// Given iptables debug logger is quite verbose, we only turn it to debug level
-		// if it is explicitly asked to be at debug level; even if the global logger is
-		// at the debug level, we keep iptables at info level by default.
-		defaultLevel = log.LevelInfo.String()
-	}
-	i.LogLevel = gosettings.DefaultComparable(i.LogLevel, defaultLevel)
-}
-
-func (i Iptables) String() string {
-	return i.toLinesNode().String()
-}
-
-func (i Iptables) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("Iptables settings:")
-	node.Appendf("Log level: %s", i.LogLevel)
-	return node
-}
-
-func (i *Iptables) read(r *reader.Reader) (err error) {
-	debugMode, err := r.BoolPtr("FIREWALL_DEBUG", reader.IsRetro("FIREWALL_IPTABLES_LOG_LEVEL"))
-	if err != nil {
-		return err
-	}
-	if debugMode != nil && *debugMode {
-		i.LogLevel = log.LevelDebug.String()
-	}
-	i.LogLevel = r.String("FIREWALL_IPTABLES_LOG_LEVEL")
-	return nil
-}

internal/configuration/settings/ipv6.go

@@ -1,58 +0,0 @@
-package settings
-
-import (
-	"net/netip"
-
-	"github.com/qdm12/gosettings"
-	"github.com/qdm12/gosettings/reader"
-	"github.com/qdm12/gotree"
-)
-
-// IPv6 contains settings regarding IPv6 configuration.
-type IPv6 struct {
-	// CheckAddresses are the TCP ip:port addresses to dial to check if
-	// IPv6 is supported, in case a default IPv6 route is found.
-	// It defaults to google and cloudflare IPv6 anycast addresses
-	// [2001:4860:4860::8888]:53,[2606:4700:4700::1111]:53
-	CheckAddresses []netip.AddrPort
-}
-
-func (i IPv6) validate() (err error) {
-	return nil
-}
-
-func (i *IPv6) copy() (copied IPv6) {
-	return IPv6{
-		CheckAddresses: gosettings.CopySlice(i.CheckAddresses),
-	}
-}
-
-func (i *IPv6) overrideWith(other IPv6) {
-	i.CheckAddresses = gosettings.OverrideWithSlice(i.CheckAddresses, other.CheckAddresses)
-}
-
-func (i *IPv6) setDefaults() {
-	defaultCheckAddresses := []netip.AddrPort{
-		netip.MustParseAddrPort("[2001:4860:4860::8888]:53"),
-		netip.MustParseAddrPort("[2606:4700:4700::1111]:53"),
-	}
-	i.CheckAddresses = gosettings.DefaultSlice(i.CheckAddresses, defaultCheckAddresses)
-}
-
-func (i IPv6) String() string {
-	return i.toLinesNode().String()
-}
-
-func (i IPv6) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("IPv6 settings:")
-	addrsNode := node.Appendf("Check addresses:")
-	for _, addr := range i.CheckAddresses {
-		addrsNode.Append(addr.String())
-	}
-	return node
-}
-
-func (i *IPv6) read(r *reader.Reader) (err error) {
-	i.CheckAddresses, err = r.CSVNetipAddrPorts("IPV6_CHECK_ADDRESSES")
-	return err
-}

internal/configuration/settings/openvpnselection.go

@@ -60,6 +60,7 @@ func (o OpenVPNSelection) validate(vpnProvider string) (err error) {
 		providers.Giganews,
 		providers.Ipvanish,
 		providers.Perfectprivacy,
+		providers.Privado,
 		providers.Vyprvpn,
 	) {
 		return fmt.Errorf("%w: for VPN service provider %s",
@@ -74,8 +75,8 @@ func (o OpenVPNSelection) validate(vpnProvider string) (err error) {
 			providers.Privatevpn, providers.Torguard:
 		// no custom port allowed
 		case providers.Expressvpn, providers.Fastestvpn,
-			providers.Giganews, providers.Ipvanish,
-			providers.Nordvpn, providers.Purevpn,
+			providers.Giganews, providers.Ipvanish, providers.Nordvpn,
+			providers.Privado, providers.Purevpn,
 			providers.Surfshark, providers.VPNSecure,
 			providers.VPNUnlimited, providers.Vyprvpn:
 			return fmt.Errorf("%w: for VPN service provider %s",
@@ -98,9 +99,6 @@ func (o OpenVPNSelection) validate(vpnProvider string) (err error) {
 			case providers.Perfectprivacy:
 				allowedTCP = []uint16{44, 443, 4433}
 				allowedUDP = []uint16{44, 443, 4433}
-			case providers.Privado:
-				allowedTCP = []uint16{443, 1194, 8080, 8443}
-				allowedUDP = []uint16{443, 1194, 8080, 8443}
 			case providers.PrivateInternetAccess:
 				allowedTCP = []uint16{80, 110, 443}
 				allowedUDP = []uint16{53, 1194, 1197, 1198, 8080, 9201}

internal/configuration/settings/pmtud.go

@@ -1,111 +0,0 @@
-package settings
-
-import (
-	"errors"
-	"fmt"
-	"net/netip"
-
-	"github.com/qdm12/gosettings"
-	"github.com/qdm12/gosettings/reader"
-	"github.com/qdm12/gotree"
-)
-
-// PMTUD contains settings to configure Path MTU Discovery.
-type PMTUD struct {
-	// ICMPAddresses is the redundancy list of addresses to use
-	// for ICMP path MTU discovery. Each address MUST handle ICMP
-	// packets for PMTUD to work.
-	// It cannot be nil in the internal state.
-	ICMPAddresses []netip.Addr `json:"icmp_addresses"`
-	// TCPAddresses is the redundancy list of addresses to use
-	// for TCP path MTU discovery. Each address MUST have a listening
-	// TCP server on the port specified.
-	// It cannot be nil in the internal state.
-	TCPAddresses []netip.AddrPort `json:"tcp_addresses"`
-}
-
-var (
-	ErrPMTUDICMPAddressNotValid = errors.New("PMTUD ICMP address is not valid")
-	ErrPMTUDTCPAddressNotValid  = errors.New("PMTUD TCP address is not valid")
-)
-
-// Validate validates PMTUD settings.
-func (p PMTUD) validate() (err error) {
-	for i, addr := range p.ICMPAddresses {
-		if !addr.IsValid() {
-			return fmt.Errorf("%w: at index %d", ErrPMTUDICMPAddressNotValid, i)
-		}
-	}
-	for i, addr := range p.TCPAddresses {
-		if !addr.IsValid() {
-			return fmt.Errorf("%w: at index %d", ErrPMTUDTCPAddressNotValid, i)
-		}
-	}
-	return nil
-}
-
-func (p *PMTUD) copy() (copied PMTUD) {
-	return PMTUD{
-		ICMPAddresses: gosettings.CopySlice(p.ICMPAddresses),
-		TCPAddresses:  gosettings.CopySlice(p.TCPAddresses),
-	}
-}
-
-func (p *PMTUD) overrideWith(other PMTUD) {
-	p.ICMPAddresses = gosettings.OverrideWithSlice(p.ICMPAddresses, other.ICMPAddresses)
-	p.TCPAddresses = gosettings.OverrideWithSlice(p.TCPAddresses, other.TCPAddresses)
-}
-
-func (p *PMTUD) setDefaults() {
-	defaultICMPAddresses := []netip.Addr{
-		netip.AddrFrom4([4]byte{1, 1, 1, 1}),
-		netip.AddrFrom4([4]byte{8, 8, 8, 8}),
-	}
-	p.ICMPAddresses = gosettings.DefaultSlice(p.ICMPAddresses, defaultICMPAddresses)
-
-	const dnsPort, tlsPort = 53, 443
-	defaultTCPAddresses := []netip.AddrPort{
-		netip.AddrPortFrom(netip.AddrFrom4([4]byte{1, 1, 1, 1}), dnsPort),
-		netip.AddrPortFrom(netip.AddrFrom4([4]byte{8, 8, 8, 8}), dnsPort),
-		netip.AddrPortFrom(netip.AddrFrom4([4]byte{1, 1, 1, 1}), tlsPort),
-		netip.AddrPortFrom(netip.AddrFrom4([4]byte{8, 8, 8, 8}), tlsPort),
-		netip.AddrPortFrom(netip.MustParseAddr("2606:4700:4700::1111"), dnsPort),
-		netip.AddrPortFrom(netip.MustParseAddr("2001:4860:4860::8888"), dnsPort),
-		netip.AddrPortFrom(netip.MustParseAddr("2606:4700:4700::1111"), tlsPort),
-		netip.AddrPortFrom(netip.MustParseAddr("2001:4860:4860::8888"), tlsPort),
-	}
-	p.TCPAddresses = gosettings.DefaultSlice(p.TCPAddresses, defaultTCPAddresses)
-}
-
-func (p PMTUD) String() string {
-	return p.toLinesNode().String()
-}
-
-func (p PMTUD) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("Path MTU discovery:")
-
-	icmpAddrNode := node.Append("ICMP addresses:")
-	for _, addr := range p.ICMPAddresses {
-		icmpAddrNode.Append(addr.String())
-	}
-
-	tcpAddrNode := node.Append("TCP addresses:")
-	for _, addr := range p.TCPAddresses {
-		tcpAddrNode.Append(addr.String())
-	}
-	return node
-}
-
-func (p *PMTUD) read(r *reader.Reader) (err error) {
-	p.ICMPAddresses, err = r.CSVNetipAddresses("PMTUD_ICMP_ADDRESSES")
-	if err != nil {
-		return err
-	}
-
-	p.TCPAddresses, err = r.CSVNetipAddrPorts("PMTUD_TCP_ADDRESSES")
-	if err != nil {
-		return err
-	}
-
-	return nil
-}

internal/configuration/settings/provider.go

@@ -2,8 +2,6 @@ package settings
 
 import (
 	"fmt"
-	"slices"
-	"sort"
 	"strings"
 
 	"github.com/qdm12/gluetun/internal/constants/providers"
@@ -30,18 +28,10 @@ type Provider struct {
 func (p *Provider) validate(vpnType string, filterChoicesGetter FilterChoicesGetter, warner Warner) (err error) {
 	// Validate Name
 	var validNames []string
-	switch vpnType {
-	case vpn.AmneziaWg:
-		validNames = []string{providers.Custom}
-	case vpn.OpenVPN:
+	if vpnType == vpn.OpenVPN {
 		validNames = providers.AllWithCustom()
 		validNames = append(validNames, "pia") // Retro-compatibility
-		// Remove Mullvad since it no longer supports OpenVPN as of January 15th, 2026
-		mullvadIndex := slices.Index(validNames, providers.Mullvad)
-		validNames[mullvadIndex], validNames[len(validNames)-1] = validNames[len(validNames)-1], validNames[mullvadIndex]
-		validNames = validNames[:len(validNames)-1]
-		sort.Strings(validNames)
-	case vpn.Wireguard:
+	} else { // Wireguard
 		validNames = []string{
 			providers.Airvpn,
 			providers.Custom,
@@ -55,7 +45,11 @@ func (p *Provider) validate(vpnType string, filterChoicesGetter FilterChoicesGet
 		}
 	}
 	if err = validate.IsOneOf(p.Name, validNames...); err != nil {
-		return fmt.Errorf("%w for %s: %w", ErrVPNProviderNameNotValid, vpnType, err)
+		return fmt.Errorf("%w for Wireguard: %w", ErrVPNProviderNameNotValid, err)
+	}
+
+	if p.Name == providers.Mullvad && vpnType == vpn.OpenVPN {
+		warner.Warn("https://mullvad.net/en/blog/removing-openvpn-15th-january-2026")
 	}
 
 	err = p.ServerSelection.validate(p.Name, filterChoicesGetter, warner)

internal/configuration/settings/serverselection.go

@@ -87,7 +87,7 @@ func (ss *ServerSelection) validate(vpnServiceProvider string,
 	filterChoicesGetter FilterChoicesGetter, warner Warner,
 ) (err error) {
 	switch ss.VPN {
-	case vpn.AmneziaWg, vpn.OpenVPN, vpn.Wireguard:
+	case vpn.OpenVPN, vpn.Wireguard:
 	default:
 		return fmt.Errorf("%w: %s", ErrVPNTypeNotValid, ss.VPN)
 	}
@@ -518,8 +518,7 @@ func (ss *ServerSelection) read(r *reader.Reader,
 		return err
 	}
 
-	amneziawg := ss.VPN == vpn.AmneziaWg
-	err = ss.Wireguard.read(r, amneziawg)
+	err = ss.Wireguard.read(r)
 	if err != nil {
 		return err
 	}

internal/configuration/settings/settings.go

@@ -2,6 +2,7 @@ package settings
 
 import (
 	"fmt"
+	"net/netip"
 
 	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
 	"github.com/qdm12/gluetun/internal/constants/providers"
@@ -26,9 +27,7 @@ type Settings struct {
 	Updater       Updater
 	Version       Version
 	VPN           VPN
-	IPv6          IPv6
 	Pprof         pprof.Settings
-	BoringPoll    BoringPoll
 }
 
 type FilterChoicesGetter interface {
@@ -54,12 +53,10 @@ func (s *Settings) Validate(filterChoicesGetter FilterChoicesGetter, ipv6Support
 		"system":          s.System.validate,
 		"updater":         s.Updater.Validate,
 		"version":         s.Version.validate,
-		"ipv6":            s.IPv6.validate,
 		// Pprof validation done in pprof constructor
 		"VPN": func() error {
 			return s.VPN.Validate(filterChoicesGetter, ipv6Supported, warner)
 		},
-		"boring poll": s.BoringPoll.validate,
 	}
 
 	for name, validation := range nameToValidation {
@@ -88,8 +85,6 @@ func (s *Settings) copy() (copied Settings) {
 		Version:       s.Version.copy(),
 		VPN:           s.VPN.Copy(),
 		Pprof:         s.Pprof.Copy(),
-		BoringPoll:    s.BoringPoll.Copy(),
-		IPv6:          s.IPv6.copy(),
 	}
 }
 
@@ -111,8 +106,6 @@ func (s *Settings) OverrideWith(other Settings,
 	patchedSettings.Version.overrideWith(other.Version)
 	patchedSettings.VPN.OverrideWith(other.VPN)
 	patchedSettings.Pprof.OverrideWith(other.Pprof)
-	patchedSettings.BoringPoll.overrideWith(other.BoringPoll)
-	patchedSettings.IPv6.overrideWith(other.IPv6)
 	err = patchedSettings.Validate(filterChoicesGetter, ipv6Supported, warner)
 	if err != nil {
 		return err
@@ -124,12 +117,10 @@ func (s *Settings) OverrideWith(other Settings,
 func (s *Settings) SetDefaults() {
 	s.ControlServer.setDefaults()
 	s.DNS.setDefaults()
-	s.Log.setDefaults()
-	s.Firewall.setDefaults(s.Log.Level)
+	s.Firewall.setDefaults()
 	s.Health.SetDefaults()
 	s.HTTPProxy.setDefaults()
 	s.Log.setDefaults()
-	s.IPv6.setDefaults()
 	s.PublicIP.setDefaults()
 	s.Shadowsocks.setDefaults()
 	s.Storage.setDefaults()
@@ -138,7 +129,6 @@ func (s *Settings) SetDefaults() {
 	s.VPN.setDefaults()
 	s.Updater.SetDefaults(s.VPN.Provider.Name)
 	s.Pprof.SetDefaults()
-	s.BoringPoll.setDefaults()
 }
 
 func (s Settings) String() string {
@@ -152,7 +142,6 @@ func (s Settings) toLinesNode() (node *gotree.Node) {
 	node.AppendNode(s.DNS.toLinesNode())
 	node.AppendNode(s.Firewall.toLinesNode())
 	node.AppendNode(s.Log.toLinesNode())
-	node.AppendNode(s.IPv6.toLinesNode())
 	node.AppendNode(s.Health.toLinesNode())
 	node.AppendNode(s.Shadowsocks.toLinesNode())
 	node.AppendNode(s.HTTPProxy.toLinesNode())
@@ -163,7 +152,6 @@ func (s Settings) toLinesNode() (node *gotree.Node) {
 	node.AppendNode(s.Updater.toLinesNode())
 	node.AppendNode(s.Version.toLinesNode())
 	node.AppendNode(s.Pprof.ToLinesNode())
-	node.AppendNode(s.BoringPoll.toLinesNode())
 
 	return node
 }
@@ -186,11 +174,13 @@ func (s Settings) Warnings() (warnings []string) {
 			"by creating an issue, attaching the new certificate and we will update Gluetun.")
 	}
 
-	for _, upstreamAddress := range s.DNS.UpstreamPlainAddresses {
-		if upstreamAddress.Addr().IsPrivate() {
-			warnings = append(warnings, "DNS upstream address "+upstreamAddress.String()+" is private: "+
-				"DNS traffic might leak out of the VPN tunnel to that address.")
-		}
+	// TODO remove in v4
+	if s.DNS.ServerAddress.Unmap().Compare(netip.AddrFrom4([4]byte{127, 0, 0, 1})) != 0 {
+		warnings = append(warnings, "DNS address is set to "+s.DNS.ServerAddress.String()+
+			" so the local forwarding DNS server will not be used."+
+			" The default value changed to 127.0.0.1 so it uses the internal DNS server."+
+			" If this server fails to start, the IPv4 address of the first plaintext DNS server"+
+			" corresponding to the first DNS provider chosen is used.")
 	}
 
 	return warnings
@@ -218,9 +208,7 @@ func (s *Settings) Read(r *reader.Reader, warner Warner) (err error) {
 		"updater":     s.Updater.read,
 		"version":     s.Version.read,
 		"VPN":         s.VPN.read,
-		"IPv6":        s.IPv6.read,
 		"profiling":   s.Pprof.Read,
-		"boring poll": s.BoringPoll.read,
 	}
 
 	for name, read := range readFunctions {

internal/configuration/settings/settings_test.go

@@ -29,28 +29,18 @@ func Test_Settings_String(t *testing.T) {
 |   |       └── OpenVPN server selection settings:
 |   |           ├── Protocol: UDP
 |   |           └── Private Internet Access encryption preset: strong
-|   ├── OpenVPN settings:
-|   |   ├── OpenVPN version: 2.6
-|   |   ├── User: [not set]
-|   |   ├── Password: [not set]
-|   |   ├── Private Internet Access encryption preset: strong
-|   |   ├── Network interface: tun0
-|   |   ├── Run OpenVPN as: root
-|   |   └── Verbosity level: 1
-|   └── Path MTU discovery:
-|       ├── ICMP addresses:
-|       |   ├── 1.1.1.1
-|       |   └── 8.8.8.8
-|       └── TCP addresses:
-|           ├── 1.1.1.1:53
-|           ├── 8.8.8.8:53
-|           ├── 1.1.1.1:443
-|           ├── 8.8.8.8:443
-|           ├── [2606:4700:4700::1111]:53
-|           ├── [2001:4860:4860::8888]:53
-|           ├── [2606:4700:4700::1111]:443
-|           └── [2001:4860:4860::8888]:443
+|   └── OpenVPN settings:
+|       ├── OpenVPN version: 2.6
+|       ├── User: [not set]
+|       ├── Password: [not set]
+|       ├── Private Internet Access encryption preset: strong
+|       ├── Network interface: tun0
+|       ├── Run OpenVPN as: root
+|       └── Verbosity level: 1
 ├── DNS settings:
+|   ├── Keep existing nameserver(s): no
+|   ├── DNS server address to use: 127.0.0.1
+|   ├── DNS forwarder server enabled: yes
 |   ├── Upstream resolver type: dot
 |   ├── Upstream resolvers:
 |   |   └── Cloudflare
@@ -62,15 +52,9 @@ func Test_Settings_String(t *testing.T) {
 |       ├── Block ads: no
 |       └── Block surveillance: yes
 ├── Firewall settings:
-|   ├── Enabled: yes
-|   └── Iptables settings:
-|       └── Log level: INFO
+|   └── Enabled: yes
 ├── Log settings:
 |   └── Log level: INFO
-├── IPv6 settings:
-|   └── Check addresses:
-|       ├── [2001:4860:4860::8888]:53
-|       └── [2606:4700:4700::1111]:53
 ├── Health settings:
 |   ├── Server listening address: 127.0.0.1:9999
 |   ├── Target addresses:

internal/configuration/settings/updater.go

@@ -21,6 +21,10 @@ type Updater struct {
 	// updater. It cannot be nil in the internal state.
 	// TODO change to value and add Enabled field.
 	Period *time.Duration
+	// DNSAddress is the DNS server address to use
+	// to resolve VPN server hostnames to IP addresses.
+	// It cannot be the empty string in the internal state.
+	DNSAddress string
 	// MinRatio is the minimum ratio of servers to
 	// find per provider, compared to the total current
 	// number of servers. It defaults to 0.8.
@@ -72,6 +76,7 @@ func (u Updater) Validate() (err error) {
 func (u *Updater) copy() (copied Updater) {
 	return Updater{
 		Period:         gosettings.CopyPointer(u.Period),
+		DNSAddress:     u.DNSAddress,
 		MinRatio:       u.MinRatio,
 		Providers:      gosettings.CopySlice(u.Providers),
 		ProtonEmail:    gosettings.CopyPointer(u.ProtonEmail),
@@ -84,6 +89,7 @@ func (u *Updater) copy() (copied Updater) {
 // settings.
 func (u *Updater) overrideWith(other Updater) {
 	u.Period = gosettings.OverrideWithPointer(u.Period, other.Period)
+	u.DNSAddress = gosettings.OverrideWithComparable(u.DNSAddress, other.DNSAddress)
 	u.MinRatio = gosettings.OverrideWithComparable(u.MinRatio, other.MinRatio)
 	u.Providers = gosettings.OverrideWithSlice(u.Providers, other.Providers)
 	u.ProtonEmail = gosettings.OverrideWithPointer(u.ProtonEmail, other.ProtonEmail)
@@ -92,6 +98,7 @@ func (u *Updater) overrideWith(other Updater) {
 
 func (u *Updater) SetDefaults(vpnProvider string) {
 	u.Period = gosettings.DefaultPointer(u.Period, 0)
+	u.DNSAddress = gosettings.DefaultComparable(u.DNSAddress, "1.1.1.1:53")
 
 	if u.MinRatio == 0 {
 		const defaultMinRatio = 0.8
@@ -118,6 +125,7 @@ func (u Updater) toLinesNode() (node *gotree.Node) {
 
 	node = gotree.New("Server data updater settings:")
 	node.Appendf("Update period: %s", *u.Period)
+	node.Appendf("DNS address: %s", u.DNSAddress)
 	node.Appendf("Minimum ratio: %.1f", u.MinRatio)
 	node.Appendf("Providers to update: %s", strings.Join(u.Providers, ", "))
 	if slices.Contains(u.Providers, providers.Protonvpn) {
@@ -134,6 +142,11 @@ func (u *Updater) read(r *reader.Reader) (err error) {
 		return err
 	}
 
+	u.DNSAddress, err = readUpdaterDNSAddress()
+	if err != nil {
+		return err
+	}
+
 	u.MinRatio, err = r.Float64("UPDATER_MIN_RATIO")
 	if err != nil {
 		return err
@@ -153,3 +166,12 @@ func (u *Updater) read(r *reader.Reader) (err error) {
 
 	return nil
 }
+
+func readUpdaterDNSAddress() (address string, err error) {
+	// TODO this is currently using Cloudflare in
+	// plaintext to not be blocked by DNS over TLS by default.
+	// If a plaintext address is set in the DNS settings, this one will be used.
+	// use custom future encrypted DNS written in Go without blocking
+	// as it's too much trouble to start another parallel unbound instance for now.
+	return "", nil
+}

internal/configuration/settings/vpn.go

@@ -16,26 +16,14 @@ type VPN struct {
 	// empty string in the internal state.
 	Type      string    `json:"type"`
 	Provider  Provider  `json:"provider"`
-	AmneziaWg AmneziaWg `json:"amneziawg"`
 	OpenVPN   OpenVPN   `json:"openvpn"`
 	Wireguard Wireguard `json:"wireguard"`
-	PMTUD     PMTUD     `json:"pmtud"`
-	// UpCommand is the command to use when the VPN connection is up.
-	// It can be the empty string to indicate not to run a command.
-	// It cannot be nil in the internal state.
-	UpCommand *string `json:"up_command"`
-	// DownCommand is the command to use after the VPN connection goes down.
-	// It can be the empty string to indicate to NOT run a command.
-	// It cannot be nil in the internal state.
-	DownCommand *string `json:"down_command"`
 }
 
-// Validate validates VPN settings, using the filter choices getter (aka servers data storage),
-// and if IPv6 is supported or not.
 // TODO v4 remove pointer for receiver (because of Surfshark).
 func (v *VPN) Validate(filterChoicesGetter FilterChoicesGetter, ipv6Supported bool, warner Warner) (err error) {
 	// Validate Type
-	validVPNTypes := []string{vpn.AmneziaWg, vpn.OpenVPN, vpn.Wireguard}
+	validVPNTypes := []string{vpn.OpenVPN, vpn.Wireguard}
 	if err = validate.IsOneOf(v.Type, validVPNTypes...); err != nil {
 		return fmt.Errorf("%w: %w", ErrVPNTypeNotValid, err)
 	}
@@ -45,66 +33,42 @@ func (v *VPN) Validate(filterChoicesGetter FilterChoicesGetter, ipv6Supported bo
 		return fmt.Errorf("provider settings: %w", err)
 	}
 
-	switch v.Type {
-	case vpn.AmneziaWg:
-		err = v.AmneziaWg.validate(v.Provider.Name, ipv6Supported)
-		if err != nil {
-			return fmt.Errorf("AmneziaWG settings: %w", err)
-		}
-	case vpn.OpenVPN:
+	if v.Type == vpn.OpenVPN {
 		err := v.OpenVPN.validate(v.Provider.Name)
 		if err != nil {
 			return fmt.Errorf("OpenVPN settings: %w", err)
 		}
-	case vpn.Wireguard:
-		const amneziawg = false
-		err := v.Wireguard.validate(v.Provider.Name, ipv6Supported, amneziawg)
+	} else {
+		err := v.Wireguard.validate(v.Provider.Name, ipv6Supported)
 		if err != nil {
 			return fmt.Errorf("Wireguard settings: %w", err)
 		}
 	}
 
-	err = v.PMTUD.validate()
-	if err != nil {
-		return fmt.Errorf("PMTUD settings: %w", err)
-	}
-
 	return nil
 }
 
 func (v *VPN) Copy() (copied VPN) {
 	return VPN{
-		Type:        v.Type,
-		Provider:    v.Provider.copy(),
-		AmneziaWg:   v.AmneziaWg.copy(),
-		OpenVPN:     v.OpenVPN.copy(),
-		Wireguard:   v.Wireguard.copy(),
-		PMTUD:       v.PMTUD.copy(),
-		UpCommand:   gosettings.CopyPointer(v.UpCommand),
-		DownCommand: gosettings.CopyPointer(v.DownCommand),
+		Type:      v.Type,
+		Provider:  v.Provider.copy(),
+		OpenVPN:   v.OpenVPN.copy(),
+		Wireguard: v.Wireguard.copy(),
 	}
 }
 
 func (v *VPN) OverrideWith(other VPN) {
 	v.Type = gosettings.OverrideWithComparable(v.Type, other.Type)
 	v.Provider.overrideWith(other.Provider)
-	v.AmneziaWg.overrideWith(other.AmneziaWg)
 	v.OpenVPN.overrideWith(other.OpenVPN)
 	v.Wireguard.overrideWith(other.Wireguard)
-	v.PMTUD.overrideWith(other.PMTUD)
-	v.UpCommand = gosettings.OverrideWithPointer(v.UpCommand, other.UpCommand)
-	v.DownCommand = gosettings.OverrideWithPointer(v.DownCommand, other.DownCommand)
 }
 
 func (v *VPN) setDefaults() {
 	v.Type = gosettings.DefaultComparable(v.Type, vpn.OpenVPN)
 	v.Provider.setDefaults()
-	v.AmneziaWg.setDefaults(v.Provider.Name)
 	v.OpenVPN.setDefaults(v.Provider.Name)
 	v.Wireguard.setDefaults(v.Provider.Name)
-	v.PMTUD.setDefaults()
-	v.UpCommand = gosettings.DefaultPointer(v.UpCommand, "")
-	v.DownCommand = gosettings.DefaultPointer(v.DownCommand, "")
 }
 
 func (v VPN) String() string {
@@ -116,22 +80,11 @@ func (v VPN) toLinesNode() (node *gotree.Node) {
 
 	node.AppendNode(v.Provider.toLinesNode())
 
-	switch v.Type {
-	case vpn.AmneziaWg:
-		node.AppendNode(v.AmneziaWg.toLinesNode())
-	case vpn.OpenVPN:
+	if v.Type == vpn.OpenVPN {
 		node.AppendNode(v.OpenVPN.toLinesNode())
-	case vpn.Wireguard:
+	} else {
 		node.AppendNode(v.Wireguard.toLinesNode())
 	}
-	node.AppendNode(v.PMTUD.toLinesNode())
-
-	if *v.UpCommand != "" {
-		node.Appendf("Up command: %s", *v.UpCommand)
-	}
-	if *v.DownCommand != "" {
-		node.Appendf("Down command: %s", *v.DownCommand)
-	}
 
 	return node
 }
@@ -144,30 +97,15 @@ func (v *VPN) read(r *reader.Reader) (err error) {
 		return fmt.Errorf("VPN provider: %w", err)
 	}
 
-	err = v.AmneziaWg.read(r)
-	if err != nil {
-		return fmt.Errorf("AmneziaWG: %w", err)
-	}
-
 	err = v.OpenVPN.read(r)
 	if err != nil {
 		return fmt.Errorf("OpenVPN: %w", err)
 	}
 
-	const amneziawg = false
-	err = v.Wireguard.read(r, amneziawg)
+	err = v.Wireguard.read(r)
 	if err != nil {
 		return fmt.Errorf("wireguard: %w", err)
 	}
 
-	err = v.PMTUD.read(r)
-	if err != nil {
-		return fmt.Errorf("PMTUD: %w", err)
-	}
-
-	v.UpCommand = r.Get("VPN_UP_COMMAND", reader.ForceLowercase(false))
-
-	v.DownCommand = r.Get("VPN_DOWN_COMMAND", reader.ForceLowercase(false))
-
 	return nil
 }

internal/configuration/settings/wireguard.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
 	"github.com/qdm12/gluetun/internal/constants/providers"
 	"github.com/qdm12/gosettings"
 	"github.com/qdm12/gosettings/reader"
@@ -37,9 +38,15 @@ type Wireguard struct {
 	Interface                   string         `json:"interface"`
 	PersistentKeepaliveInterval *time.Duration `json:"persistent_keep_alive_interval"`
 	// Maximum Transmission Unit (MTU) of the Wireguard interface.
-	// It cannot be nil in the internal state, and defaults to
-	// 0 indicating to use PMTUD.
-	MTU *uint32 `json:"mtu"`
+	// It cannot be zero in the internal state, and defaults to
+	// 1320. Note it is not the wireguard-go MTU default of 1420
+	// because this impacts bandwidth a lot on some VPN providers,
+	// see https://github.com/qdm12/gluetun/issues/1650.
+	// It has been lowered to 1320 following quite a bit of
+	// investigation in the issue:
+	// https://github.com/qdm12/gluetun/issues/2533.
+	// Note this should now be replaced with the PMTUD feature.
+	MTU uint32 `json:"mtu"`
 	// Implementation is the Wireguard implementation to use.
 	// It can be "auto", "userspace" or "kernelspace".
 	// It defaults to "auto" and cannot be the empty string
@@ -50,8 +57,23 @@ type Wireguard struct {
 var regexpInterfaceName = regexp.MustCompile(`^[a-zA-Z0-9_]+$`)
 
 // Validate validates Wireguard settings.
-// It should only be ran if the VPN type chosen is Wireguard or AmneziaWg.
-func (w Wireguard) validate(vpnProvider string, ipv6Supported, amneziawg bool) (err error) {
+// It should only be ran if the VPN type chosen is Wireguard.
+func (w Wireguard) validate(vpnProvider string, ipv6Supported bool) (err error) {
+	if !helpers.IsOneOf(vpnProvider,
+		providers.Airvpn,
+		providers.Custom,
+		providers.Fastestvpn,
+		providers.Ivpn,
+		providers.Mullvad,
+		providers.Nordvpn,
+		providers.Protonvpn,
+		providers.Surfshark,
+		providers.Windscribe,
+	) {
+		// do not validate for VPN provider not supporting Wireguard
+		return nil
+	}
+
 	// Validate PrivateKey
 	if *w.PrivateKey == "" {
 		return fmt.Errorf("%w", ErrWireguardPrivateKeyNotSet)
@@ -120,11 +142,9 @@ func (w Wireguard) validate(vpnProvider string, ipv6Supported, amneziawg bool) (
 			ErrWireguardInterfaceNotValid, w.Interface, regexpInterfaceName)
 	}
 
-	if !amneziawg { // amneziawg should have its own Implementation field and ignore this one
-		validImplementations := []string{"auto", "userspace", "kernelspace"}
-		if err := validate.IsOneOf(w.Implementation, validImplementations...); err != nil {
-			return fmt.Errorf("%w: %w", ErrWireguardImplementationNotValid, err)
-		}
+	validImplementations := []string{"auto", "userspace", "kernelspace"}
+	if err := validate.IsOneOf(w.Implementation, validImplementations...); err != nil {
+		return fmt.Errorf("%w: %w", ErrWireguardImplementationNotValid, err)
 	}
 
 	return nil
@@ -175,7 +195,8 @@ func (w *Wireguard) setDefaults(vpnProvider string) {
 	w.AllowedIPs = gosettings.DefaultSlice(w.AllowedIPs, defaultAllowedIPs)
 	w.PersistentKeepaliveInterval = gosettings.DefaultPointer(w.PersistentKeepaliveInterval, 0)
 	w.Interface = gosettings.DefaultComparable(w.Interface, "wg0")
-	w.MTU = gosettings.DefaultPointer(w.MTU, 0)
+	const defaultMTU = 1320
+	w.MTU = gosettings.DefaultComparable(w.MTU, defaultMTU)
 	w.Implementation = gosettings.DefaultComparable(w.Implementation, "auto")
 }
 
@@ -211,11 +232,7 @@ func (w Wireguard) toLinesNode() (node *gotree.Node) {
 	}
 
 	interfaceNode := node.Appendf("Network interface: %s", w.Interface)
-	if *w.MTU == 0 {
-		interfaceNode.Append("MTU: use path MTU discovery")
-	} else {
-		interfaceNode.Appendf("MTU: %d", *w.MTU)
-	}
+	interfaceNode.Appendf("MTU: %d", w.MTU)
 
 	if w.Implementation != "auto" {
 		node.Appendf("Implementation: %s", w.Implementation)
@@ -224,21 +241,14 @@ func (w Wireguard) toLinesNode() (node *gotree.Node) {
 	return node
 }
 
-func (w *Wireguard) read(r *reader.Reader, amneziaWG bool) (err error) {
-	prefix := "WIREGUARD"
-	if amneziaWG {
-		prefix = "AMNEZIAWG"
-	}
-	w.PrivateKey = r.Get(prefix+"_PRIVATE_KEY", reader.ForceLowercase(false))
-	w.PreSharedKey = r.Get(prefix+"_PRESHARED_KEY", reader.ForceLowercase(false))
+func (w *Wireguard) read(r *reader.Reader) (err error) {
+	w.PrivateKey = r.Get("WIREGUARD_PRIVATE_KEY", reader.ForceLowercase(false))
+	w.PreSharedKey = r.Get("WIREGUARD_PRESHARED_KEY", reader.ForceLowercase(false))
 	w.Interface = r.String("VPN_INTERFACE",
-		reader.RetroKeys(prefix+"_INTERFACE"), reader.ForceLowercase(false))
+		reader.RetroKeys("WIREGUARD_INTERFACE"), reader.ForceLowercase(false))
+	w.Implementation = r.String("WIREGUARD_IMPLEMENTATION")
 
-	if !amneziaWG {
-		w.Implementation = r.String("WIREGUARD_IMPLEMENTATION")
-	}
-
-	addressStrings := r.CSV(prefix+"_ADDRESSES", reader.RetroKeys(prefix+"_ADDRESS"))
+	addressStrings := r.CSV("WIREGUARD_ADDRESSES", reader.RetroKeys("WIREGUARD_ADDRESS"))
 	// WARNING: do not initialize w.Addresses to an empty slice
 	// or the defaults for nordvpn will not work.
 	for _, addressString := range addressStrings {
@@ -253,19 +263,21 @@ func (w *Wireguard) read(r *reader.Reader, amneziaWG bool) (err error) {
 		w.Addresses = append(w.Addresses, address)
 	}
 
-	w.AllowedIPs, err = r.CSVNetipPrefixes(prefix + "_ALLOWED_IPS")
+	w.AllowedIPs, err = r.CSVNetipPrefixes("WIREGUARD_ALLOWED_IPS")
 	if err != nil {
 		return err // already wrapped
 	}
 
-	w.PersistentKeepaliveInterval, err = r.DurationPtr(prefix + "_PERSISTENT_KEEPALIVE_INTERVAL")
+	w.PersistentKeepaliveInterval, err = r.DurationPtr("WIREGUARD_PERSISTENT_KEEPALIVE_INTERVAL")
 	if err != nil {
 		return err
 	}
 
-	w.MTU, err = r.Uint32Ptr(prefix + "_MTU")
+	mtuPtr, err := r.Uint32Ptr("WIREGUARD_MTU")
 	if err != nil {
 		return err
+	} else if mtuPtr != nil {
+		w.MTU = *mtuPtr
 	}
 	return nil
 }

internal/configuration/settings/wireguardselection.go

@@ -152,22 +152,18 @@ func (w WireguardSelection) toLinesNode() (node *gotree.Node) {
 	return node
 }
 
-func (w *WireguardSelection) read(r *reader.Reader, amneziaWG bool) (err error) {
-	prefix := "WIREGUARD"
-	if amneziaWG {
-		prefix = "AMNEZIAWG"
-	}
-	w.EndpointIP, err = r.NetipAddr(prefix+"_ENDPOINT_IP", reader.RetroKeys("VPN_ENDPOINT_IP"))
+func (w *WireguardSelection) read(r *reader.Reader) (err error) {
+	w.EndpointIP, err = r.NetipAddr("WIREGUARD_ENDPOINT_IP", reader.RetroKeys("VPN_ENDPOINT_IP"))
 	if err != nil {
 		return fmt.Errorf("%w - note this MUST be an IP address, "+
 			"see https://github.com/qdm12/gluetun/issues/788", err)
 	}
 
-	w.EndpointPort, err = r.Uint16Ptr(prefix+"_ENDPOINT_PORT", reader.RetroKeys("VPN_ENDPOINT_PORT"))
+	w.EndpointPort, err = r.Uint16Ptr("WIREGUARD_ENDPOINT_PORT", reader.RetroKeys("VPN_ENDPOINT_PORT"))
 	if err != nil {
 		return err
 	}
 
-	w.PublicKey = r.String(prefix+"_PUBLIC_KEY", reader.ForceLowercase(false))
+	w.PublicKey = r.String("WIREGUARD_PUBLIC_KEY", reader.ForceLowercase(false))
 	return nil
 }

internal/configuration/sources/files/amneziawg.go

@@ -1,84 +0,0 @@
-package files
-
-import (
-	"errors"
-	"fmt"
-	"os"
-	"path/filepath"
-
-	"gopkg.in/ini.v1"
-)
-
-func (s *Source) lazyLoadAmneziawgConf() AmneziawgConfig {
-	if s.cached.amneziawgLoaded {
-		return s.cached.amneziawgConf
-	}
-
-	s.cached.amneziawgLoaded = true
-	var err error
-	s.cached.amneziawgConf, err = ParseAmneziawgConf(filepath.Join(s.rootDirectory, "amneziawg", "awg0.conf"))
-	if err != nil {
-		s.warner.Warnf("skipping Amneziawg config: %s", err)
-	}
-	return s.cached.amneziawgConf
-}
-
-type AmneziawgConfig struct {
-	Wireguard WireguardConfig
-	Jc        *string
-	Jmin      *string
-	Jmax      *string
-	S1        *string
-	S2        *string
-	S3        *string
-	S4        *string
-	H1        *string
-	H2        *string
-	H3        *string
-	H4        *string
-	I1        *string
-	I2        *string
-	I3        *string
-	I4        *string
-	I5        *string
-}
-
-func ParseAmneziawgConf(path string) (config AmneziawgConfig, err error) {
-	iniFile, err := ini.InsensitiveLoad(path)
-	if err != nil {
-		if errors.Is(err, os.ErrNotExist) {
-			return AmneziawgConfig{}, nil
-		}
-		return AmneziawgConfig{}, fmt.Errorf("loading ini from reader: %w", err)
-	}
-
-	config.Wireguard, err = ParseWireguardConf(path)
-	if err != nil {
-		return AmneziawgConfig{}, err
-	}
-
-	interfaceSection, err := iniFile.GetSection("Interface")
-	if err != nil {
-		// can never happen
-		return AmneziawgConfig{}, fmt.Errorf("getting interface section: %w", err)
-	}
-
-	config.Jc = getINIKeyFromSection(interfaceSection, "Jc")
-	config.Jmin = getINIKeyFromSection(interfaceSection, "Jmin")
-	config.Jmax = getINIKeyFromSection(interfaceSection, "Jmax")
-	config.S1 = getINIKeyFromSection(interfaceSection, "S1")
-	config.S2 = getINIKeyFromSection(interfaceSection, "S2")
-	config.S3 = getINIKeyFromSection(interfaceSection, "S3")
-	config.S4 = getINIKeyFromSection(interfaceSection, "S4")
-	config.H1 = getINIKeyFromSection(interfaceSection, "H1")
-	config.H2 = getINIKeyFromSection(interfaceSection, "H2")
-	config.H3 = getINIKeyFromSection(interfaceSection, "H3")
-	config.H4 = getINIKeyFromSection(interfaceSection, "H4")
-	config.I1 = getINIKeyFromSection(interfaceSection, "I1")
-	config.I2 = getINIKeyFromSection(interfaceSection, "I2")
-	config.I3 = getINIKeyFromSection(interfaceSection, "I3")
-	config.I4 = getINIKeyFromSection(interfaceSection, "I4")
-	config.I5 = getINIKeyFromSection(interfaceSection, "I5")
-
-	return config, nil
-}

internal/configuration/sources/files/amneziawg_test.go

@@ -1,82 +0,0 @@
-package files
-
-import (
-	"io/fs"
-	"os"
-	"path/filepath"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-func Test_Source_ParseAmneziawgConf(t *testing.T) {
-	t.Parallel()
-
-	t.Run("no_file", func(t *testing.T) {
-		t.Parallel()
-
-		noFile := filepath.Join(t.TempDir(), "doesnotexist")
-		wireguard, err := ParseAmneziawgConf(noFile)
-		assert.Equal(t, AmneziawgConfig{}, wireguard)
-		assert.NoError(t, err)
-	})
-
-	testCases := map[string]struct {
-		fileContent string
-		amneziawg   AmneziawgConfig
-		errMessage  string
-	}{
-		"ini_load_error": {
-			fileContent: "invalid",
-			errMessage:  "loading ini from reader: key-value delimiter not found: invalid",
-		},
-		"empty_file": {
-			errMessage: `getting interface section: section "interface" does not exist`,
-		},
-		"success": {
-			fileContent: `
-[Interface]
-PrivateKey = QOlCgyA/Sn/c/+YNTIEohrjm8IZV+OZ2AUFIoX20sk8=
-Address = 10.38.22.35/32
-DNS = 193.138.218.74
-Jc = 4
-H1 = 721391205
-I1 = <b 0x1234>
-
-[Peer]
-PresharedKey = YJ680VN+dGrdsWNjSFqZ6vvwuiNhbq502ZL3G7Q3o3g=
-`,
-			amneziawg: AmneziawgConfig{
-				Wireguard: WireguardConfig{
-					PrivateKey:   ptrTo("QOlCgyA/Sn/c/+YNTIEohrjm8IZV+OZ2AUFIoX20sk8="),
-					PreSharedKey: ptrTo("YJ680VN+dGrdsWNjSFqZ6vvwuiNhbq502ZL3G7Q3o3g="),
-					Addresses:    ptrTo("10.38.22.35/32"),
-				},
-				Jc: ptrTo("4"),
-				H1: ptrTo("721391205"),
-				I1: ptrTo("<b 0x1234>"),
-			},
-		},
-	}
-
-	for testName, testCase := range testCases {
-		t.Run(testName, func(t *testing.T) {
-			t.Parallel()
-
-			configFile := filepath.Join(t.TempDir(), "awg.conf")
-			const permission = fs.FileMode(0o600)
-			err := os.WriteFile(configFile, []byte(testCase.fileContent), permission)
-			require.NoError(t, err)
-
-			wireguard, err := ParseAmneziawgConf(configFile)
-
-			assert.Equal(t, testCase.amneziawg, wireguard)
-			if testCase.errMessage != "" {
-				assert.EqualError(t, err, testCase.errMessage)
-			} else {
-				assert.NoError(t, err)
-			}
-		})
-	}
-}

internal/configuration/sources/files/reader.go

@@ -13,8 +13,6 @@ type Source struct {
 	cached        struct {
 		wireguardLoaded bool
 		wireguardConf   WireguardConfig
-		amneziawgLoaded bool
-		amneziawgConf   AmneziawgConfig
 	}
 }
 
@@ -73,11 +71,6 @@ func (s *Source) Get(key string) (value string, isSet bool) {
 		return strPtrToStringIsSet(s.lazyLoadWireguardConf().EndpointPort)
 	}
 
-	value, isSet, matched := s.getAmneziawgKey(key)
-	if matched {
-		return value, isSet
-	}
-
 	value, isSet, err := ReadFromFile(path)
 	if err != nil {
 		s.warner.Warnf("skipping %s: reading file: %s", path, err)
@@ -85,58 +78,6 @@ func (s *Source) Get(key string) (value string, isSet bool) {
 	return value, isSet
 }
 
-func (s *Source) getAmneziawgKey(key string) (value string, isSet, matched bool) {
-	switch key {
-	case "amnezia_private_key":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Wireguard.PrivateKey)
-	case "amnezia_preshared_key":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Wireguard.PreSharedKey)
-	case "amnezia_addresses":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Wireguard.Addresses)
-	case "amnezia_public_key":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Wireguard.PublicKey)
-	case "amnezia_endpoint_ip":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Wireguard.EndpointIP)
-	case "amnezia_endpoint_port":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Wireguard.EndpointPort)
-	case "amnezia_jc":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Jc)
-	case "amnezia_jmin":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Jmin)
-	case "amnezia_jmax":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Jmax)
-	case "amnezia_s1":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().S1)
-	case "amnezia_s2":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().S2)
-	case "amnezia_s3":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().S3)
-	case "amnezia_s4":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().S4)
-	case "amnezia_h1":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().H1)
-	case "amnezia_h2":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().H2)
-	case "amnezia_h3":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().H3)
-	case "amnezia_h4":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().H4)
-	case "amnezia_i1":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().I1)
-	case "amnezia_i2":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().I2)
-	case "amnezia_i3":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().I3)
-	case "amnezia_i4":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().I4)
-	case "amnezia_i5":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().I5)
-	default:
-		return "", false, false
-	}
-	return value, isSet, true
-}
-
 func (s *Source) KeyTransform(key string) string {
 	switch key {
 	// TODO v4 remove these irregular cases

internal/configuration/sources/files/wireguard.go

@@ -3,7 +3,6 @@ package files
 import (
 	"errors"
 	"fmt"
-	"net"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -83,15 +82,12 @@ func parseWireguardPeerSection(peerSection *ini.Section) (
 	publicKey = getINIKeyFromSection(peerSection, "PublicKey")
 	endpoint := getINIKeyFromSection(peerSection, "Endpoint")
 	if endpoint != nil {
-		host, port, err := net.SplitHostPort(*endpoint)
-		if err == nil {
-			endpointIP = &host
-			// IPv6 hosts contain colons; port is managed by the provider for those
-			if !strings.Contains(host, ":") {
-				endpointPort = &port
-			}
-		} else {
-			endpointIP = endpoint
+		parts := strings.Split(*endpoint, ":")
+		endpointIP = &parts[0]
+		const partsWithPort = 2
+		if len(parts) >= partsWithPort {
+			endpointPort = new(string)
+			*endpointPort = strings.Join(parts[1:], ":")
 		}
 	}
 

internal/configuration/sources/files/wireguard_test.go

@@ -179,11 +179,6 @@ Endpoint = 1.2.3.4:51820`,
 			endpointIP:   ptrTo("1.2.3.4"),
 			endpointPort: ptrTo("51820"),
 		},
-		"ipv6_endpoint": {
-			iniData: `[Peer]
-Endpoint = [2a02:bbbb:aaaa:8075::10]:51820`,
-			endpointIP: ptrTo("2a02:bbbb:aaaa:8075::10"),
-		},
 	}
 
 	for testName, testCase := range testCases {

internal/configuration/sources/secrets/amneziawg.go

@@ -1,27 +0,0 @@
-package secrets
-
-import (
-	"os"
-	"path/filepath"
-
-	"github.com/qdm12/gluetun/internal/configuration/sources/files"
-)
-
-func (s *Source) lazyLoadAmneziawgConf() files.AmneziawgConfig {
-	if s.cached.amneziawgLoaded {
-		return s.cached.amneziawgConf
-	}
-
-	path := os.Getenv("AMNEZIAWG_CONF_SECRETFILE")
-	if path == "" {
-		path = filepath.Join(s.rootDirectory, "amneziawg", "awg0.conf")
-	}
-
-	s.cached.amneziawgLoaded = true
-	var err error
-	s.cached.amneziawgConf, err = files.ParseAmneziawgConf(path)
-	if err != nil {
-		s.warner.Warnf("skipping Amneziawg config: %s", err)
-	}
-	return s.cached.amneziawgConf
-}

internal/configuration/sources/secrets/reader.go

@@ -15,8 +15,6 @@ type Source struct {
 	cached        struct {
 		wireguardLoaded bool
 		wireguardConf   files.WireguardConfig
-		amneziawgLoaded bool
-		amneziawgConf   files.AmneziawgConfig
 	}
 }
 
@@ -85,11 +83,6 @@ func (s *Source) Get(key string) (value string, isSet bool) {
 		return strPtrToStringIsSet(s.lazyLoadWireguardConf().EndpointPort)
 	}
 
-	value, isSet, matched := s.getAmneziaWg(key)
-	if matched {
-		return value, isSet
-	}
-
 	value, isSet, err := files.ReadFromFile(path)
 	if err != nil {
 		s.warner.Warnf("skipping %s: reading file: %s", path, err)
@@ -111,55 +104,3 @@ func (s *Source) KeyTransform(key string) string {
 		return key
 	}
 }
-
-func (s *Source) getAmneziaWg(key string) (value string, isSet, matched bool) {
-	switch key {
-	case "amneziawg_private_key":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Wireguard.PrivateKey)
-	case "amneziawg_preshared_key":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Wireguard.PreSharedKey)
-	case "amneziawg_addresses":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Wireguard.Addresses)
-	case "amneziawg_public_key":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Wireguard.PublicKey)
-	case "amneziawg_endpoint_ip":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Wireguard.EndpointIP)
-	case "amneziawg_endpoint_port":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Wireguard.EndpointPort)
-	case "amneziawg_jc":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Jc)
-	case "amneziawg_jmin":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Jmin)
-	case "amneziawg_jmax":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().Jmax)
-	case "amneziawg_s1":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().S1)
-	case "amneziawg_s2":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().S2)
-	case "amneziawg_s3":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().S3)
-	case "amneziawg_s4":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().S4)
-	case "amneziawg_h1":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().H1)
-	case "amneziawg_h2":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().H2)
-	case "amneziawg_h3":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().H3)
-	case "amneziawg_h4":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().H4)
-	case "amneziawg_i1":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().I1)
-	case "amneziawg_i2":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().I2)
-	case "amneziawg_i3":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().I3)
-	case "amneziawg_i4":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().I4)
-	case "amneziawg_i5":
-		value, isSet = strPtrToStringIsSet(s.lazyLoadAmneziawgConf().I5)
-	default:
-		return "", false, false
-	}
-	return value, isSet, true
-}

internal/constants/vpn/protocol.go

@@ -1,7 +1,6 @@
 package vpn
 
 const (
-	AmneziaWg = "amneziawg"
 	OpenVPN   = "openvpn"
 	Wireguard = "wireguard"
 )

internal/dns/interfaces.go

@@ -0,0 +1,17 @@
+package dns
+
+import (
+	"context"
+	"net/netip"
+)
+
+type Logger interface {
+	Debug(s string)
+	Info(s string)
+	Warn(s string)
+	Error(s string)
+}
+
+type Firewall interface {
+	RestrictOutputAddrPort(ctx context.Context, addrPort netip.AddrPort) (err error)
+}

internal/dns/leak.go

@@ -1,131 +0,0 @@
-package dns
-
-import (
-	"context"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"math"
-	"math/rand/v2"
-	"net/http"
-	"sort"
-	"strings"
-)
-
-func leakCheck(ctx context.Context, client *http.Client) (report string, err error) {
-	const sessionLength = 40
-	session := generateRandomString(sessionLength)
-
-	ctx, cancel := context.WithCancel(ctx)
-	defer cancel()
-	type result struct {
-		dnsToCount map[string]uint
-		err        error
-	}
-	resultsCh := make(chan result)
-
-	const requestsCount = 5
-	for range requestsCount {
-		go func() {
-			dnsToCount, err := triggerDNSQuery(ctx, client, session)
-			resultsCh <- result{dnsToCount: dnsToCount, err: err}
-		}()
-	}
-
-	dnsToCount := make(map[string]uint)
-	for range requestsCount {
-		result := <-resultsCh
-		if result.err != nil {
-			if err == nil {
-				cancel()
-				err = fmt.Errorf("request failed: %w", result.err)
-			}
-			continue
-		}
-		for dns, count := range result.dnsToCount {
-			dnsToCount[dns] += count
-		}
-	}
-
-	if err != nil {
-		return "", err
-	}
-
-	return formatPercentages(dnsToCount), nil
-}
-
-func generateRandomString(length uint) string {
-	const charset = "abcdefghijklmnopqrstuvwxyz0123456789"
-	b := make([]byte, length)
-	for i := range b {
-		b[i] = charset[rand.IntN(len(charset))] //nolint:gosec
-	}
-	return string(b)
-}
-
-var errIPLeakSessionMismatch = errors.New("ipleak.net session mismatch")
-
-func triggerDNSQuery(ctx context.Context, client *http.Client, session string) (
-	dnsToCount map[string]uint, err error,
-) {
-	const randomLength = 12
-	randomPart := generateRandomString(randomLength)
-	url := fmt.Sprintf("https://%s-%s.ipleak.net/dnsdetection/", session, randomPart)
-	request, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
-	if err != nil {
-		return nil, fmt.Errorf("creating request: %w", err)
-	}
-
-	response, err := client.Do(request)
-	if err != nil {
-		return nil, fmt.Errorf("performing request: %w", err)
-	}
-	defer response.Body.Close()
-
-	type ipLeakData struct {
-		Session string          `json:"session"`
-		IP      map[string]uint `json:"ip"`
-	}
-
-	decoder := json.NewDecoder(response.Body)
-	var data ipLeakData
-	err = decoder.Decode(&data)
-	if err != nil {
-		return nil, fmt.Errorf("decoding response: %w", err)
-	} else if data.Session != session {
-		return nil, fmt.Errorf("%w: expected %s, got %s", errIPLeakSessionMismatch, session, data.Session)
-	}
-
-	return data.IP, nil
-}
-
-func formatPercentages(data map[string]uint) string {
-	if len(data) == 0 {
-		return ""
-	}
-
-	var total uint
-	keys := make([]string, 0, len(data))
-	for k, v := range data {
-		total += v
-		keys = append(keys, k)
-	}
-
-	sort.Slice(keys, func(i, j int) bool {
-		if data[keys[i]] == data[keys[j]] {
-			return keys[i] < keys[j] // Tie-breaker: alphabetical
-		}
-		return data[keys[i]] > data[keys[j]]
-	})
-
-	results := make([]string, len(keys))
-	for i, key := range keys {
-		var pct float64
-		if total > 0 {
-			pct = math.Ceil((float64(data[key]) / float64(total)) * 100) //nolint:mnd
-		}
-		results[i] = fmt.Sprintf("%s (%.0f%%)", key, pct)
-	}
-
-	return strings.Join(results, ", ")
-}

internal/dns/leak_test.go

@@ -1,22 +0,0 @@
-package dns
-
-import (
-	"context"
-	"net/http"
-	"testing"
-	"time"
-
-	"github.com/stretchr/testify/require"
-)
-
-func Test_leakCheck(t *testing.T) {
-	t.Parallel()
-
-	const timeout = 10 * time.Second
-	ctx, cancel := context.WithTimeout(t.Context(), timeout)
-	t.Cleanup(cancel)
-	client := http.DefaultClient
-	report, err := leakCheck(ctx, client)
-	require.NoError(t, err)
-	require.NotEmpty(t, report)
-}

internal/dns/logger.go

@@ -1,10 +0,0 @@
-package dns
-
-type Logger interface {
-	Debug(s string)
-	Info(s string)
-	Infof(format string, args ...any)
-	Warn(s string)
-	Warnf(format string, args ...any)
-	Error(s string)
-}

internal/dns/loop.go

@@ -22,9 +22,9 @@ type Loop struct {
 	server         *server.Server
 	filter         *mapfilter.Filter
 	localResolvers []netip.Addr
-	localSubnets   []netip.Prefix
 	resolvConf     string
 	client         *http.Client
+	firewall       Firewall
 	logger         Logger
 	userTrigger    bool
 	start          <-chan struct{}
@@ -40,7 +40,7 @@ type Loop struct {
 const defaultBackoffTime = 10 * time.Second
 
 func NewLoop(settings settings.DNS,
-	client *http.Client, logger Logger, localSubnets []netip.Prefix,
+	client *http.Client, firewall Firewall, logger Logger,
 ) (loop *Loop, err error) {
 	start := make(chan struct{})
 	running := make(chan models.LoopStatus)
@@ -63,9 +63,9 @@ func NewLoop(settings settings.DNS,
 		state:         state,
 		server:        nil,
 		filter:        filter,
-		localSubnets:  localSubnets,
 		resolvConf:    "/etc/resolv.conf",
 		client:        client,
+		firewall:      firewall,
 		logger:        logger,
 		userTrigger:   true,
 		start:         start,

internal/dns/plaintext.go

@@ -0,0 +1,44 @@
+package dns
+
+import (
+	"context"
+	"net/netip"
+	"time"
+
+	"github.com/qdm12/dns/v2/pkg/nameserver"
+)
+
+func (l *Loop) useUnencryptedDNS(ctx context.Context, fallback bool) {
+	settings := l.GetSettings()
+
+	targetIP := settings.GetFirstPlaintextIPv4()
+
+	if fallback {
+		l.logger.Info("falling back on plaintext DNS at address " + targetIP.String())
+	} else {
+		l.logger.Info("using plaintext DNS at address " + targetIP.String())
+	}
+
+	const dialTimeout = 3 * time.Second
+	const defaultDNSPort = 53
+	addrPort := netip.AddrPortFrom(targetIP, defaultDNSPort)
+	settingsInternalDNS := nameserver.SettingsInternalDNS{
+		AddrPort: addrPort,
+		Timeout:  dialTimeout,
+	}
+	nameserver.UseDNSInternally(settingsInternalDNS)
+
+	settingsSystemWide := nameserver.SettingsSystemDNS{
+		IPs:        []netip.Addr{targetIP},
+		ResolvPath: l.resolvConf,
+	}
+	err := nameserver.UseDNSSystemWide(settingsSystemWide)
+	if err != nil {
+		l.logger.Error(err.Error())
+	}
+
+	err = l.firewall.RestrictOutputAddrPort(ctx, addrPort)
+	if err != nil {
+		l.logger.Error("restricting plain DNS traffic to " + targetIP.String() + ": " + err.Error())
+	}
+}

internal/dns/run.go

@@ -2,9 +2,9 @@ package dns
 
 import (
 	"context"
+	"errors"
 
 	"github.com/qdm12/dns/v2/pkg/nameserver"
-	"github.com/qdm12/gluetun/internal/configuration/settings"
 	"github.com/qdm12/gluetun/internal/constants"
 )
 
@@ -18,6 +18,15 @@ func (l *Loop) Run(ctx context.Context, done chan<- struct{}) {
 		return
 	}
 
+	if *l.GetSettings().KeepNameserver {
+		l.logger.Warn("⚠️⚠️⚠️  keeping the default container nameservers, " +
+			"this will likely leak DNS traffic outside the VPN " +
+			"and go through your container network DNS outside the VPN tunnel!")
+	} else {
+		const fallback = false
+		l.useUnencryptedDNS(ctx, fallback)
+	}
+
 	select {
 	case <-l.start:
 	case <-ctx.Done():
@@ -29,40 +38,39 @@ func (l *Loop) Run(ctx context.Context, done chan<- struct{}) {
 		// Their values are to be used if DOT=off
 		var runError <-chan error
 
-		var settings settings.DNS
-		for {
-			settings = l.GetSettings()
+		settings := l.GetSettings()
+		for !*settings.KeepNameserver && *settings.ServerEnabled {
 			var err error
-			runError, err = l.setupServer(ctx, settings)
+			runError, err = l.setupServer(ctx)
 			if err == nil {
+				l.backoffTime = defaultBackoffTime
+				l.logger.Info("ready")
 				break
 			}
 
 			l.signalOrSetStatus(constants.Crashed)
+
 			if ctx.Err() != nil {
 				return
 			}
+
+			if !errors.Is(err, errUpdateBlockLists) {
+				const fallback = true
+				l.useUnencryptedDNS(ctx, fallback)
+			}
 			l.logAndWait(ctx, err)
-		}
-
-		l.backoffTime = defaultBackoffTime
-		l.logger.Infof("ready and using DNS server with %s upstream resolvers", settings.UpstreamType)
-
-		err = l.updateFiles(ctx, settings)
-		if err != nil {
-			l.logger.Warn("downloading block lists failed, skipping: " + err.Error())
+			settings = l.GetSettings()
 		}
 		l.signalOrSetStatus(constants.Running)
 
-		l.userTrigger = false
-
-		report, err := leakCheck(ctx, l.client)
-		if err != nil {
-			l.logger.Warnf("running leak check: %s", err)
-		} else {
-			l.logger.Infof("leak check report: %s", report)
+		settings = l.GetSettings()
+		if !*settings.KeepNameserver && !*settings.ServerEnabled {
+			const fallback = false
+			l.useUnencryptedDNS(ctx, fallback)
 		}
 
+		l.userTrigger = false
+
 		exitLoop := l.runWait(ctx, runError)
 		if exitLoop {
 			return
@@ -74,13 +82,21 @@ func (l *Loop) runWait(ctx context.Context, runError <-chan error) (exitLoop boo
 	for {
 		select {
 		case <-ctx.Done():
-			l.stopServer()
-			// TODO revert OS and Go nameserver when exiting
+			settings := l.GetSettings()
+			if !*settings.KeepNameserver && *settings.ServerEnabled {
+				l.stopServer()
+				// TODO revert OS and Go nameserver when exiting
+			}
 			return true
 		case <-l.stop:
 			l.userTrigger = true
 			l.logger.Info("stopping")
-			l.stopServer()
+			settings := l.GetSettings()
+			if !*settings.KeepNameserver && *settings.ServerEnabled {
+				const fallback = false
+				l.useUnencryptedDNS(ctx, fallback)
+				l.stopServer()
+			}
 			l.stopped <- struct{}{}
 		case <-l.start:
 			l.userTrigger = true
@@ -88,6 +104,8 @@ func (l *Loop) runWait(ctx context.Context, runError <-chan error) (exitLoop boo
 			return false
 		case err := <-runError: // unexpected error
 			l.statusManager.SetStatus(constants.Crashed)
+			const fallback = true
+			l.useUnencryptedDNS(ctx, fallback)
 			l.logAndWait(ctx, err)
 			return false
 		}

internal/dns/settings.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"net/netip"
-	"slices"
 
 	"github.com/qdm12/dns/v2/pkg/doh"
 	"github.com/qdm12/dns/v2/pkg/dot"
@@ -27,23 +26,31 @@ func (l *Loop) SetSettings(ctx context.Context, settings settings.DNS) (
 	return l.state.SetSettings(ctx, settings)
 }
 
-func buildServerSettings(userSettings settings.DNS,
+func buildServerSettings(settings settings.DNS,
 	filter *mapfilter.Filter, localResolvers []netip.Addr,
-	localSubnets []netip.Prefix, logger Logger) (
+	logger Logger) (
 	serverSettings server.Settings, err error,
 ) {
 	serverSettings.Logger = logger
 
-	upstreamResolvers := buildProviders(userSettings, localSubnets, logger)
+	providersData := provider.NewProviders()
+	upstreamResolvers := make([]provider.Provider, len(settings.Providers))
+	for i := range settings.Providers {
+		var err error
+		upstreamResolvers[i], err = providersData.Get(settings.Providers[i])
+		if err != nil {
+			panic(err) // this should already had been checked
+		}
+	}
 
 	ipVersion := "ipv4"
-	if *userSettings.IPv6 {
+	if *settings.IPv6 {
 		ipVersion = "ipv6"
 	}
 
 	var dialer server.Dialer
-	switch userSettings.UpstreamType {
-	case settings.DNSUpstreamTypeDot:
+	switch settings.UpstreamType {
+	case "dot":
 		dialerSettings := dot.Settings{
 			UpstreamResolvers: upstreamResolvers,
 			IPVersion:         ipVersion,
@@ -52,7 +59,7 @@ func buildServerSettings(userSettings settings.DNS,
 		if err != nil {
 			return server.Settings{}, fmt.Errorf("creating DNS over TLS dialer: %w", err)
 		}
-	case settings.DNSUpstreamTypeDoh:
+	case "doh":
 		dialerSettings := doh.Settings{
 			UpstreamResolvers: upstreamResolvers,
 			IPVersion:         ipVersion,
@@ -61,7 +68,7 @@ func buildServerSettings(userSettings settings.DNS,
 		if err != nil {
 			return server.Settings{}, fmt.Errorf("creating DNS over HTTPS dialer: %w", err)
 		}
-	case settings.DNSUpstreamTypePlain:
+	case "plain":
 		dialerSettings := plain.Settings{
 			UpstreamResolvers: upstreamResolvers,
 			IPVersion:         ipVersion,
@@ -71,11 +78,11 @@ func buildServerSettings(userSettings settings.DNS,
 			return server.Settings{}, fmt.Errorf("creating plain DNS dialer: %w", err)
 		}
 	default:
-		panic("unknown upstream type: " + userSettings.UpstreamType)
+		panic("unknown upstream type: " + settings.UpstreamType)
 	}
 	serverSettings.Dialer = dialer
 
-	if *userSettings.Caching {
+	if *settings.Caching {
 		lruCache, err := lru.New(lru.Settings{})
 		if err != nil {
 			return server.Settings{}, fmt.Errorf("creating LRU cache: %w", err)
@@ -116,46 +123,3 @@ func buildServerSettings(userSettings settings.DNS,
 
 	return serverSettings, nil
 }
-
-func buildProviders(userSettings settings.DNS, localSubnets []netip.Prefix,
-	logger Logger,
-) (providers []provider.Provider) {
-	userDefinedPlainAddresses := userSettings.UpstreamType == settings.DNSUpstreamTypePlain &&
-		len(userSettings.UpstreamPlainAddresses) > 0
-	if !userDefinedPlainAddresses {
-		providers = make([]provider.Provider, len(userSettings.Providers))
-		providersData := provider.NewProviders()
-		for i, providerName := range userSettings.Providers {
-			var err error
-			providers[i], err = providersData.Get(providerName)
-			if err != nil {
-				panic(err) // this should already had been checked
-			}
-		}
-		return providers
-	}
-
-	providers = make([]provider.Provider, len(userSettings.UpstreamPlainAddresses))
-	for i, addrPort := range userSettings.UpstreamPlainAddresses {
-		addr := addrPort.Addr()
-		if addr.IsPrivate() && !addr.IsLoopback() &&
-			!slices.ContainsFunc(localSubnets, func(prefix netip.Prefix) bool {
-				return prefix.Contains(addr)
-			}) {
-			logger.Warnf("DNS server address %s is not in local subnets, "+
-				"make sure to specify it in FIREWALL_OUTBOUND_SUBNETS as %s",
-				addr, netip.PrefixFrom(addr, addr.BitLen()))
-		}
-
-		providers[i] = provider.Provider{
-			Name: addrPort.String(),
-		}
-		if addr.Is4() {
-			providers[i].Plain.IPv4 = []netip.AddrPort{addrPort}
-		} else {
-			providers[i].Plain.IPv6 = []netip.AddrPort{addrPort}
-		}
-	}
-
-	return providers
-}

internal/dns/setup.go

@@ -2,23 +2,26 @@ package dns
 
 import (
 	"context"
+	"errors"
 	"fmt"
+	"net/netip"
 
-	"github.com/qdm12/dns/v2/pkg/middlewares/filter/update"
+	"github.com/qdm12/dns/v2/pkg/check"
 	"github.com/qdm12/dns/v2/pkg/nameserver"
 	"github.com/qdm12/dns/v2/pkg/server"
-	"github.com/qdm12/gluetun/internal/configuration/settings"
 )
 
-func (l *Loop) setupServer(ctx context.Context, settings settings.DNS) (runError <-chan error, err error) {
-	var updateSettings update.Settings
-	updateSettings.SetRebindingProtectionExempt(settings.Blacklist.RebindingProtectionExemptHostnames)
-	err = l.filter.Update(updateSettings)
+var errUpdateBlockLists = errors.New("cannot update filter block lists")
+
+func (l *Loop) setupServer(ctx context.Context) (runError <-chan error, err error) {
+	err = l.updateFiles(ctx)
 	if err != nil {
-		return nil, fmt.Errorf("updating filter for rebinding protection: %w", err)
+		return nil, fmt.Errorf("%w: %w", errUpdateBlockLists, err)
 	}
 
-	serverSettings, err := buildServerSettings(settings, l.filter, l.localResolvers, l.localSubnets, l.logger)
+	settings := l.GetSettings()
+
+	serverSettings, err := buildServerSettings(settings, l.filter, l.localResolvers, l.logger)
 	if err != nil {
 		return nil, fmt.Errorf("building server settings: %w", err)
 	}
@@ -35,13 +38,29 @@ func (l *Loop) setupServer(ctx context.Context, settings settings.DNS) (runError
 	l.server = server
 
 	// use internal DNS server
-	nameserver.UseDNSInternally(nameserver.SettingsInternalDNS{})
+	const defaultDNSPort = 53
+	addrPort := netip.AddrPortFrom(settings.ServerAddress, defaultDNSPort)
+	nameserver.UseDNSInternally(nameserver.SettingsInternalDNS{
+		AddrPort: addrPort,
+	})
 	err = nameserver.UseDNSSystemWide(nameserver.SettingsSystemDNS{
+		IPs:        []netip.Addr{settings.ServerAddress},
 		ResolvPath: l.resolvConf,
 	})
 	if err != nil {
 		l.logger.Error(err.Error())
 	}
 
+	err = l.firewall.RestrictOutputAddrPort(ctx, addrPort)
+	if err != nil {
+		l.logger.Error("restricting plain DNS traffic to " + addrPort.Addr().String() + ": " + err.Error())
+	}
+
+	err = check.WaitForDNS(ctx, check.Settings{})
+	if err != nil {
+		l.stopServer()
+		return nil, err
+	}
+
 	return runError, nil
 }

internal/dns/state/settings.go

@@ -40,6 +40,8 @@ func (s *State) SetSettings(ctx context.Context, settings settings.DNS) (
 
 	// Restart
 	_, _ = s.statusApplier.ApplyStatus(ctx, constants.Stopped)
-	outcome, _ = s.statusApplier.ApplyStatus(ctx, constants.Running)
+	if *settings.ServerEnabled {
+		outcome, _ = s.statusApplier.ApplyStatus(ctx, constants.Running)
+	}
 	return outcome
 }

internal/dns/ticker.go

@@ -28,12 +28,23 @@ func (l *Loop) RunRestartTicker(ctx context.Context, done chan<- struct{}) {
 			return
 		case <-timer.C:
 			lastTick = l.timeNow()
-			settings := l.GetSettings()
-			if l.GetStatus() == constants.Running {
-				if err := l.updateFiles(ctx, settings); err != nil {
-					l.logger.Warn("updating block lists failed, skipping: " + err.Error())
+
+			status := l.GetStatus()
+			if status == constants.Running {
+				if err := l.updateFiles(ctx); err != nil {
+					l.statusManager.SetStatus(constants.Crashed)
+					l.logger.Error(err.Error())
+					l.logger.Warn("skipping DNS server restart due to failed files update")
+					settings := l.GetSettings()
+					timer.Reset(*settings.UpdatePeriod)
+					continue
 				}
 			}
+
+			_, _ = l.statusManager.ApplyStatus(ctx, constants.Stopped)
+			_, _ = l.statusManager.ApplyStatus(ctx, constants.Running)
+
+			settings := l.GetSettings()
 			timer.Reset(*settings.UpdatePeriod)
 		case <-l.updateTicker:
 			if !timer.Stop() {

internal/dns/update.go

@@ -6,10 +6,11 @@ import (
 
 	"github.com/qdm12/dns/v2/pkg/blockbuilder"
 	"github.com/qdm12/dns/v2/pkg/middlewares/filter/update"
-	"github.com/qdm12/gluetun/internal/configuration/settings"
 )
 
-func (l *Loop) updateFiles(ctx context.Context, settings settings.DNS) (err error) {
+func (l *Loop) updateFiles(ctx context.Context) (err error) {
+	settings := l.GetSettings()
+
 	l.logger.Info("downloading hostnames and IP block lists")
 	blacklistSettings := settings.Blacklist.ToBlockBuilderSettings(l.client)
 
@@ -36,6 +37,7 @@ func (l *Loop) updateFiles(ctx context.Context, settings settings.DNS) (err erro
 		IPPrefixes: result.BlockedIPPrefixes,
 	}
 	updateSettings.BlockHostnames(result.BlockedHostnames)
+	updateSettings.SetRebindingProtectionExempt(settings.Blacklist.RebindingProtectionExemptHostnames)
 	err = l.filter.Update(updateSettings)
 	if err != nil {
 		return fmt.Errorf("updating filter: %w", err)

internal/firewall/cmd_matcher_test.go

@@ -1,4 +1,4 @@
-package iptables
+package firewall
 
 import (
 	"fmt"

internal/firewall/delete.go

@@ -1,4 +1,4 @@
-package iptables
+package firewall
 
 import (
 	"context"

internal/firewall/delete_test.go

@@ -1,4 +1,4 @@
-package iptables
+package firewall
 
 import (
 	"context"

internal/firewall/enable.go

@@ -22,7 +22,9 @@ func (c *Config) SetEnabled(ctx context.Context, enabled bool) (err error) {
 
 	if !enabled {
 		c.logger.Info("disabling...")
-		c.restore(ctx)
+		if err = c.disable(ctx); err != nil {
+			return fmt.Errorf("disabling firewall: %w", err)
+		}
 		c.enabled = false
 		c.logger.Info("disabled successfully")
 		return nil
@@ -39,37 +41,64 @@ func (c *Config) SetEnabled(ctx context.Context, enabled bool) (err error) {
 	return nil
 }
 
-func (c *Config) enable(ctx context.Context) (err error) {
-	c.restore, err = c.impl.SaveAndRestore(ctx)
+func (c *Config) disable(ctx context.Context) (err error) {
+	if err = c.clearAllRules(ctx); err != nil {
+		return fmt.Errorf("clearing all rules: %w", err)
+	}
+	if err = c.setIPv4AllPolicies(ctx, "ACCEPT"); err != nil {
+		return fmt.Errorf("setting ipv4 policies: %w", err)
+	}
+	if err = c.setIPv6AllPolicies(ctx, "ACCEPT"); err != nil {
+		return fmt.Errorf("setting ipv6 policies: %w", err)
+	}
+
+	const remove = true
+	err = c.redirectPorts(ctx, remove)
 	if err != nil {
-		return fmt.Errorf("saving firewall rules: %w", err)
+		return fmt.Errorf("removing port redirections: %w", err)
 	}
 
-	defer func() {
-		if err != nil {
-			c.restore(context.Background())
-		}
-	}()
+	return nil
+}
 
-	if err = c.impl.SetIPv4AllPolicies(ctx, "DROP"); err != nil {
+// To use in defered call when enabling the firewall.
+func (c *Config) fallbackToDisabled(ctx context.Context) {
+	if ctx.Err() != nil {
+		return
+	}
+	if err := c.disable(ctx); err != nil {
+		c.logger.Error("failed reversing firewall changes: " + err.Error())
+	}
+}
+
+func (c *Config) enable(ctx context.Context) (err error) {
+	touched := false
+	if err = c.setIPv4AllPolicies(ctx, "DROP"); err != nil {
 		return err
 	}
+	touched = true
 
-	if err = c.impl.SetIPv6AllPolicies(ctx, "DROP"); err != nil {
-		return err
-	}
-
-	// Loopback traffic
-	if err = c.impl.AcceptInputThroughInterface(ctx, "lo"); err != nil {
+	if err = c.setIPv6AllPolicies(ctx, "DROP"); err != nil {
 		return err
 	}
 
 	const remove = false
-	if err = c.impl.AcceptOutputThroughInterface(ctx, "lo", remove); err != nil {
+
+	defer func() {
+		if touched && err != nil {
+			c.fallbackToDisabled(ctx)
+		}
+	}()
+
+	// Loopback traffic
+	if err = c.acceptInputThroughInterface(ctx, "lo", remove); err != nil {
+		return err
+	}
+	if err = c.acceptOutputThroughInterface(ctx, "lo", remove); err != nil {
 		return err
 	}
 
-	if err = c.impl.AcceptEstablishedRelatedTraffic(ctx); err != nil {
+	if err = c.acceptEstablishedRelatedTraffic(ctx, remove); err != nil {
 		return err
 	}
 
@@ -79,9 +108,7 @@ func (c *Config) enable(ctx context.Context) (err error) {
 
 	localInterfaces := make(map[string]struct{}, len(c.localNetworks))
 	for _, network := range c.localNetworks {
-		err = c.impl.AcceptOutputFromIPToSubnet(ctx,
-			network.InterfaceName, network.IP, network.IPNet, remove)
-		if err != nil {
+		if err := c.acceptOutputFromIPToSubnet(ctx, network.InterfaceName, network.IP, network.IPNet, remove); err != nil {
 			return err
 		}
 
@@ -90,7 +117,7 @@ func (c *Config) enable(ctx context.Context) (err error) {
 			continue
 		}
 		localInterfaces[network.InterfaceName] = struct{}{}
-		err = c.impl.AcceptIpv6MulticastOutput(ctx, network.InterfaceName)
+		err = c.acceptIpv6MulticastOutput(ctx, network.InterfaceName, remove)
 		if err != nil {
 			return fmt.Errorf("accepting IPv6 multicast output: %w", err)
 		}
@@ -103,7 +130,7 @@ func (c *Config) enable(ctx context.Context) (err error) {
 	// Allows packets from any IP address to go through eth0 / local network
 	// to reach Gluetun.
 	for _, network := range c.localNetworks {
-		if err := c.impl.AcceptInputToSubnet(ctx, network.InterfaceName, network.IPNet); err != nil {
+		if err := c.acceptInputToSubnet(ctx, network.InterfaceName, network.IPNet, remove); err != nil {
 			return err
 		}
 	}
@@ -112,12 +139,12 @@ func (c *Config) enable(ctx context.Context) (err error) {
 		return err
 	}
 
-	err = c.redirectPorts(ctx)
+	err = c.redirectPorts(ctx, remove)
 	if err != nil {
 		return fmt.Errorf("redirecting ports: %w", err)
 	}
 
-	if err := c.impl.RunUserPostRules(ctx, c.customRulesPath); err != nil {
+	if err := c.runUserPostRules(ctx, c.customRulesPath, remove); err != nil {
 		return fmt.Errorf("running user defined post firewall rules: %w", err)
 	}
 
@@ -137,7 +164,7 @@ func (c *Config) allowVPNIP(ctx context.Context) (err error) {
 			continue
 		}
 		interfacesSeen[defaultRoute.NetInterface] = struct{}{}
-		err = c.impl.AcceptOutputTrafficToVPN(ctx, defaultRoute.NetInterface, c.vpnConnection, remove)
+		err = c.acceptOutputTrafficToVPN(ctx, defaultRoute.NetInterface, c.vpnConnection, remove)
 		if err != nil {
 			return fmt.Errorf("accepting output traffic through VPN: %w", err)
 		}
@@ -159,7 +186,7 @@ func (c *Config) allowOutboundSubnets(ctx context.Context) (err error) {
 			firewallUpdated = true
 
 			const remove = false
-			err := c.impl.AcceptOutputFromIPToSubnet(ctx, defaultRoute.NetInterface,
+			err := c.acceptOutputFromIPToSubnet(ctx, defaultRoute.NetInterface,
 				defaultRoute.AssignedIP, subnet, remove)
 			if err != nil {
 				return err
@@ -177,7 +204,7 @@ func (c *Config) allowInputPorts(ctx context.Context) (err error) {
 	for port, netInterfaces := range c.allowedInputPorts {
 		for netInterface := range netInterfaces {
 			const remove = false
-			err = c.impl.AcceptInputToPort(ctx, netInterface, port, remove)
+			err = c.acceptInputToPort(ctx, netInterface, port, remove)
 			if err != nil {
 				return fmt.Errorf("accepting input port %d on interface %s: %w",
 					port, netInterface, err)
@@ -187,10 +214,9 @@ func (c *Config) allowInputPorts(ctx context.Context) (err error) {
 	return nil
 }
 
-func (c *Config) redirectPorts(ctx context.Context) (err error) {
+func (c *Config) redirectPorts(ctx context.Context, remove bool) (err error) {
 	for _, portRedirection := range c.portRedirections {
-		const remove = false
-		err = c.impl.RedirectPort(ctx, portRedirection.interfaceName, portRedirection.sourcePort,
+		err = c.redirectPort(ctx, portRedirection.interfaceName, portRedirection.sourcePort,
 			portRedirection.destinationPort, remove)
 		if err != nil {
 			return err

internal/firewall/firewall.go

@@ -2,55 +2,63 @@ package firewall
 
 import (
 	"context"
-	"fmt"
 	"net/netip"
 	"sync"
 
-	"github.com/qdm12/gluetun/internal/firewall/iptables"
 	"github.com/qdm12/gluetun/internal/models"
 	"github.com/qdm12/gluetun/internal/routing"
 )
 
 type Config struct {
-	runner        CmdRunner
-	logger        Logger
-	defaultRoutes []routing.DefaultRoute
-	localNetworks []routing.LocalNetwork
+	runner         CmdRunner
+	logger         Logger
+	iptablesMutex  sync.Mutex
+	ip6tablesMutex sync.Mutex
+	defaultRoutes  []routing.DefaultRoute
+	localNetworks  []routing.LocalNetwork
 
-	// Fixed
-	impl            firewallImpl
+	// Fixed state
+	ipTables        string
+	ip6Tables       string
 	customRulesPath string
 
 	// State
 	enabled           bool
-	restore           func(context.Context)
 	vpnConnection     models.Connection
 	vpnIntf           string
 	outboundSubnets   []netip.Prefix
 	allowedInputPorts map[uint16]map[string]struct{} // port to interfaces set mapping
 	portRedirections  portRedirections
+	outputAddrPort    map[uint16]netip.Addr
 	stateMutex        sync.Mutex
 }
 
 // NewConfig creates a new Config instance and returns an error
 // if no iptables implementation is available.
-func NewConfig(ctx context.Context, logger, iptablesLogger Logger,
+func NewConfig(ctx context.Context, logger Logger,
 	runner CmdRunner, defaultRoutes []routing.DefaultRoute,
 	localNetworks []routing.LocalNetwork,
 ) (config *Config, err error) {
-	impl, err := iptables.New(ctx, runner, iptablesLogger)
+	iptables, err := checkIptablesSupport(ctx, runner, "iptables", "iptables-nft", "iptables-legacy")
 	if err != nil {
-		return nil, fmt.Errorf("creating iptables firewall: %w", err)
+		return nil, err
+	}
+
+	ip6tables, err := findIP6tablesSupported(ctx, runner)
+	if err != nil {
+		return nil, err
 	}
 
 	return &Config{
 		runner:            runner,
 		logger:            logger,
 		allowedInputPorts: make(map[uint16]map[string]struct{}),
+		outputAddrPort:    make(map[uint16]netip.Addr),
+		ipTables:          iptables,
+		ip6Tables:         ip6tables,
+		customRulesPath:   "/iptables/post-rules.txt",
 		// Obtained from routing
-		defaultRoutes:   defaultRoutes,
-		localNetworks:   localNetworks,
-		impl:            impl,
-		customRulesPath: "/iptables/post-rules.txt",
+		defaultRoutes: defaultRoutes,
+		localNetworks: localNetworks,
 	}, nil
 }

internal/firewall/interfaces.go

@@ -1,12 +1,6 @@
 package firewall
 
-import (
-	"context"
-	"net/netip"
-	"os/exec"
-
-	"github.com/qdm12/gluetun/internal/models"
-)
+import "os/exec"
 
 type CmdRunner interface {
 	Run(cmd *exec.Cmd) (output string, err error)
@@ -18,27 +12,3 @@ type Logger interface {
 	Warn(s string)
 	Error(s string)
 }
-
-type firewallImpl interface { //nolint:interfacebloat
-	SaveAndRestore(ctx context.Context) (restore func(context.Context), err error)
-	AcceptEstablishedRelatedTraffic(ctx context.Context) error
-	AcceptInputThroughInterface(ctx context.Context, intf string) error
-	AcceptInputToPort(ctx context.Context, intf string, port uint16, remove bool) error
-	AcceptInputToSubnet(ctx context.Context, intf string, subnet netip.Prefix) error
-	AcceptIpv6MulticastOutput(ctx context.Context, intf string) error
-	AcceptOutput(ctx context.Context, protocol, intf string,
-		ip netip.Addr, port uint16, remove bool) error
-	AcceptOutputFromIPToSubnet(ctx context.Context, intf string, assignedIP netip.Addr,
-		subnet netip.Prefix, remove bool) error
-	AcceptOutputThroughInterface(ctx context.Context, intf string, remove bool) error
-	AcceptOutputTrafficToVPN(ctx context.Context, intf string,
-		connection models.Connection, remove bool) error
-	RedirectPort(ctx context.Context, intf string, sourcePort,
-		destinationPort uint16, remove bool) error
-	RunUserPostRules(ctx context.Context, customRulesPath string) error
-	SetIPv4AllPolicies(ctx context.Context, policy string) error
-	SetIPv6AllPolicies(ctx context.Context, policy string) error
-	TempDropOutputTCPRST(ctx context.Context, src, dst netip.AddrPort, excludeMark int) (
-		revert func(ctx context.Context) error, err error)
-	Version(ctx context.Context) (version string, err error)
-}

internal/firewall/ip6tables.go

@@ -1,4 +1,4 @@
-package iptables
+package firewall
 
 import (
 	"context"
@@ -14,8 +14,8 @@ import (
 func findIP6tablesSupported(ctx context.Context, runner CmdRunner) (
 	ip6tablesPath string, err error,
 ) {
-	ip6tablesPath, err = checkIptablesSupport(ctx, runner, "ip6tables", "ip6tables-legacy")
-	if errors.Is(err, ErrNotSupported) {
+	ip6tablesPath, err = checkIptablesSupport(ctx, runner, "ip6tables", "ip6tables-nft", "ip6tables-legacy")
+	if errors.Is(err, ErrIPTablesNotSupported) {
 		return "", nil
 	} else if err != nil {
 		return "", err
@@ -24,23 +24,8 @@ func findIP6tablesSupported(ctx context.Context, runner CmdRunner) (
 }
 
 func (c *Config) runIP6tablesInstructions(ctx context.Context, instructions []string) error {
-	c.iptablesMutex.Lock() // only one iptables command at once
-	defer c.iptablesMutex.Unlock()
-
-	restore, err := c.saveAndRestoreIPv6(ctx)
-	if err != nil {
-		return err
-	}
-	err = c.runIP6tablesInstructionsNoSave(ctx, instructions)
-	if err != nil {
-		restore(ctx)
-	}
-	return err
-}
-
-func (c *Config) runIP6tablesInstructionsNoSave(ctx context.Context, instructions []string) error {
 	for _, instruction := range instructions {
-		if err := c.runIP6tablesInstructionNoSave(ctx, instruction); err != nil {
+		if err := c.runIP6tablesInstruction(ctx, instruction); err != nil {
 			return err
 		}
 	}
@@ -48,24 +33,11 @@ func (c *Config) runIP6tablesInstructionsNoSave(ctx context.Context, instruction
 }
 
 func (c *Config) runIP6tablesInstruction(ctx context.Context, instruction string) error {
-	c.iptablesMutex.Lock() // only one iptables command at once
-	defer c.iptablesMutex.Unlock()
-
-	restore, err := c.saveAndRestoreIPv6(ctx)
-	if err != nil {
-		return err
-	}
-	err = c.runIP6tablesInstructionNoSave(ctx, instruction)
-	if err != nil {
-		restore(ctx)
-	}
-	return err
-}
-
-func (c *Config) runIP6tablesInstructionNoSave(ctx context.Context, instruction string) error {
 	if c.ip6Tables == "" {
 		return nil
 	}
+	c.ip6tablesMutex.Lock() // only one ip6tables command at once
+	defer c.ip6tablesMutex.Unlock()
 
 	if isDeleteMatchInstruction(instruction) {
 		return deleteIPTablesRule(ctx, c.ip6Tables, instruction,
@@ -84,7 +56,7 @@ func (c *Config) runIP6tablesInstructionNoSave(ctx context.Context, instruction
 
 var ErrPolicyNotValid = errors.New("policy is not valid")
 
-func (c *Config) SetIPv6AllPolicies(ctx context.Context, policy string) error {
+func (c *Config) setIPv6AllPolicies(ctx context.Context, policy string) error {
 	switch policy {
 	case "ACCEPT", "DROP":
 	default:

internal/firewall/iptables.go

@@ -1,4 +1,4 @@
-package iptables
+package firewall
 
 import (
 	"context"
@@ -26,6 +26,22 @@ func appendOrDelete(remove bool) string {
 	return "--append"
 }
 
+// flipRule changes an append rule in a delete rule or a delete rule into an
+// append rule.
+func flipRule(rule string) string {
+	switch {
+	case strings.HasPrefix(rule, "-A"):
+		return strings.Replace(rule, "-A", "-D", 1)
+	case strings.HasPrefix(rule, "--append"):
+		return strings.Replace(rule, "--append", "-D", 1)
+	case strings.HasPrefix(rule, "-D"):
+		return strings.Replace(rule, "-D", "-A", 1)
+	case strings.HasPrefix(rule, "--delete"):
+		return strings.Replace(rule, "--delete", "-A", 1)
+	}
+	return rule
+}
+
 // Version obtains the version of the installed iptables.
 func (c *Config) Version(ctx context.Context) (string, error) {
 	cmd := exec.CommandContext(ctx, c.ipTables, "--version") //nolint:gosec
@@ -38,28 +54,12 @@ func (c *Config) Version(ctx context.Context) (string, error) {
 	if len(words) < minWords {
 		return "", fmt.Errorf("%w: %s", ErrIPTablesVersionTooShort, output)
 	}
-	return "iptables " + words[1], nil
+	return words[1], nil
 }
 
 func (c *Config) runIptablesInstructions(ctx context.Context, instructions []string) error {
-	c.iptablesMutex.Lock()
-	defer c.iptablesMutex.Unlock()
-
-	restore, err := c.saveAndRestoreIPv4(ctx)
-	if err != nil {
-		return err
-	}
-
-	err = c.runIptablesInstructionsNoSave(ctx, instructions)
-	if err != nil {
-		restore(ctx)
-	}
-	return err
-}
-
-func (c *Config) runIptablesInstructionsNoSave(ctx context.Context, instructions []string) error {
 	for _, instruction := range instructions {
-		if err := c.runIptablesInstructionNoSave(ctx, instruction); err != nil {
+		if err := c.runIptablesInstruction(ctx, instruction); err != nil {
 			return err
 		}
 	}
@@ -70,19 +70,6 @@ func (c *Config) runIptablesInstruction(ctx context.Context, instruction string)
 	c.iptablesMutex.Lock() // only one iptables command at once
 	defer c.iptablesMutex.Unlock()
 
-	restore, err := c.saveAndRestoreIPv4(ctx)
-	if err != nil {
-		return err
-	}
-
-	err = c.runIptablesInstructionNoSave(ctx, instruction)
-	if err != nil {
-		restore(ctx)
-	}
-	return err
-}
-
-func (c *Config) runIptablesInstructionNoSave(ctx context.Context, instruction string) error {
 	if isDeleteMatchInstruction(instruction) {
 		return deleteIPTablesRule(ctx, c.ipTables, instruction,
 			c.runner, c.logger)
@@ -98,7 +85,14 @@ func (c *Config) runIptablesInstructionNoSave(ctx context.Context, instruction s
 	return nil
 }
 
-func (c *Config) SetIPv4AllPolicies(ctx context.Context, policy string) error {
+func (c *Config) clearAllRules(ctx context.Context) error {
+	return c.runMixedIptablesInstructions(ctx, []string{
+		"--flush",        // flush all chains
+		"--delete-chain", // delete all chains
+	})
+}
+
+func (c *Config) setIPv4AllPolicies(ctx context.Context, policy string) error {
 	switch policy {
 	case "ACCEPT", "DROP":
 	default:
@@ -111,19 +105,22 @@ func (c *Config) SetIPv4AllPolicies(ctx context.Context, policy string) error {
 	})
 }
 
-func (c *Config) AcceptInputThroughInterface(ctx context.Context, intf string) error {
+func (c *Config) acceptInputThroughInterface(ctx context.Context, intf string, remove bool) error {
 	return c.runMixedIptablesInstruction(ctx, fmt.Sprintf(
-		"--append INPUT -i %s -j ACCEPT", intf))
+		"%s INPUT -i %s -j ACCEPT", appendOrDelete(remove), intf,
+	))
 }
 
-func (c *Config) AcceptInputToSubnet(ctx context.Context, intf string, destination netip.Prefix) error {
+func (c *Config) acceptInputToSubnet(ctx context.Context, intf string,
+	destination netip.Prefix, remove bool,
+) error {
 	interfaceFlag := "-i " + intf
 	if intf == "*" { // all interfaces
 		interfaceFlag = ""
 	}
 
-	instruction := fmt.Sprintf("--append INPUT %s -d %s -j ACCEPT",
-		interfaceFlag, destination.String())
+	instruction := fmt.Sprintf("%s INPUT %s -d %s -j ACCEPT",
+		appendOrDelete(remove), interfaceFlag, destination.String())
 
 	if destination.Addr().Is4() {
 		return c.runIptablesInstruction(ctx, instruction)
@@ -134,23 +131,26 @@ func (c *Config) AcceptInputToSubnet(ctx context.Context, intf string, destinati
 	return c.runIP6tablesInstruction(ctx, instruction)
 }
 
-func (c *Config) AcceptOutputThroughInterface(ctx context.Context, intf string, remove bool) error {
+func (c *Config) acceptOutputThroughInterface(ctx context.Context, intf string, remove bool) error {
 	return c.runMixedIptablesInstruction(ctx, fmt.Sprintf(
 		"%s OUTPUT -o %s -j ACCEPT", appendOrDelete(remove), intf,
 	))
 }
 
-func (c *Config) AcceptEstablishedRelatedTraffic(ctx context.Context) error {
+func (c *Config) acceptEstablishedRelatedTraffic(ctx context.Context, remove bool) error {
 	return c.runMixedIptablesInstructions(ctx, []string{
-		"--append OUTPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT",
-		"--append INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT",
+		fmt.Sprintf("%s OUTPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT", appendOrDelete(remove)),
+		fmt.Sprintf("%s INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT", appendOrDelete(remove)),
 	})
 }
 
-func (c *Config) AcceptOutputTrafficToVPN(ctx context.Context,
+func (c *Config) acceptOutputTrafficToVPN(ctx context.Context,
 	defaultInterface string, connection models.Connection, remove bool,
 ) error {
 	protocol := connection.Protocol
+	if protocol == "tcp-client" {
+		protocol = "tcp"
+	}
 	instruction := fmt.Sprintf("%s OUTPUT -d %s -o %s -p %s -m %s --dport %d -j ACCEPT",
 		appendOrDelete(remove), connection.IP, defaultInterface, protocol,
 		protocol, connection.Port)
@@ -162,29 +162,8 @@ func (c *Config) AcceptOutputTrafficToVPN(ctx context.Context,
 	return c.runIP6tablesInstruction(ctx, instruction)
 }
 
-func (c *Config) AcceptOutput(ctx context.Context,
-	protocol, intf string, ip netip.Addr, port uint16, remove bool,
-) error {
-	interfaceFlag := "-o " + intf
-	if intf == "*" { // all interfaces
-		interfaceFlag = ""
-	}
-
-	instruction := fmt.Sprintf("%s OUTPUT -d %s %s -p %s -m %s --dport %d -j ACCEPT",
-		appendOrDelete(remove), ip, interfaceFlag, protocol, protocol, port)
-	if ip.Is4() {
-		return c.runIptablesInstruction(ctx, instruction)
-	} else if c.ip6Tables == "" {
-		return fmt.Errorf("accept output to VPN server: %w", ErrNeedIP6Tables)
-	}
-	return c.runIP6tablesInstruction(ctx, instruction)
-}
-
-// AcceptOutputFromIPToSubnet accepts outgoing traffic from sourceIP to destinationSubnet
-// on the interface intf. If intf is empty, it is set to "*" which means all interfaces.
-// If remove is true, the rule is removed instead of added.
 // Thanks to @npawelek.
-func (c *Config) AcceptOutputFromIPToSubnet(ctx context.Context,
+func (c *Config) acceptOutputFromIPToSubnet(ctx context.Context,
 	intf string, sourceIP netip.Addr, destinationSubnet netip.Prefix, remove bool,
 ) error {
 	doIPv4 := sourceIP.Is4() && destinationSubnet.Addr().Is4()
@@ -205,24 +184,21 @@ func (c *Config) AcceptOutputFromIPToSubnet(ctx context.Context,
 	return c.runIP6tablesInstruction(ctx, instruction)
 }
 
-// AcceptIpv6MulticastOutput accepts outgoing traffic to the IPv6 multicast address
-// ff02::1:ff00:0/104, which is used for NDP (Neighbor Discovery Protocol) to resolve
-// IPv6 addresses to MAC addresses. If intf is empty, it is set to "*" which means
-// all interfaces. If remove is true, the rule is removed instead of added.
-func (c *Config) AcceptIpv6MulticastOutput(ctx context.Context, intf string) error {
+// NDP uses multicast address (theres no broadcast in IPv6 like ARP uses in IPv4).
+func (c *Config) acceptIpv6MulticastOutput(ctx context.Context,
+	intf string, remove bool,
+) error {
 	interfaceFlag := "-o " + intf
 	if intf == "*" { // all interfaces
 		interfaceFlag = ""
 	}
-	instruction := fmt.Sprintf("--append OUTPUT %s -d ff02::1:ff00:0/104 -j ACCEPT", interfaceFlag)
+	instruction := fmt.Sprintf("%s OUTPUT %s -d ff02::1:ff00:0/104 -j ACCEPT",
+		appendOrDelete(remove), interfaceFlag)
 	return c.runIP6tablesInstruction(ctx, instruction)
 }
 
-// AcceptInputToPort accepts incoming traffic on the specified port, for both TCP and UDP
-// protocols, on the interface intf. If intf is empty, it is set to "*" which means all interfaces.
-// If remove is true, the rule is removed instead of added. This is used for port forwarding, with
-// intf set to the VPN tunnel interface.
-func (c *Config) AcceptInputToPort(ctx context.Context, intf string, port uint16, remove bool) error {
+// Used for port forwarding, with intf set to tun.
+func (c *Config) acceptInputToPort(ctx context.Context, intf string, port uint16, remove bool) error {
 	interfaceFlag := "-i " + intf
 	if intf == "*" { // all interfaces
 		interfaceFlag = ""
@@ -233,12 +209,8 @@ func (c *Config) AcceptInputToPort(ctx context.Context, intf string, port uint16
 	})
 }
 
-// RedirectPort redirects incoming traffic on the specified source port to the
-// specified destination port, for both TCP and UDP protocols, on the interface intf.
-// If intf is empty, it is set to "*" which means all interfaces. If remove is true,
-// the redirection is removed instead of added. This is used for VPN server side
-// port forwarding, with intf set to the VPN tunnel interface.
-func (c *Config) RedirectPort(ctx context.Context, intf string,
+// Used for VPN server side port forwarding, with intf set to the VPN tunnel interface.
+func (c *Config) redirectPort(ctx context.Context, intf string,
 	sourcePort, destinationPort uint16, remove bool,
 ) (err error) {
 	interfaceFlag := "-i " + intf
@@ -246,15 +218,7 @@ func (c *Config) RedirectPort(ctx context.Context, intf string,
 		interfaceFlag = ""
 	}
 
-	c.iptablesMutex.Lock()
-	defer c.iptablesMutex.Unlock()
-
-	restore, err := c.saveAndRestore(ctx)
-	if err != nil {
-		return err
-	}
-
-	err = c.runIptablesInstructionsNoSave(ctx, []string{
+	err = c.runIptablesInstructions(ctx, []string{
 		fmt.Sprintf("-t nat %s PREROUTING %s -p tcp --dport %d -j REDIRECT --to-ports %d",
 			appendOrDelete(remove), interfaceFlag, sourcePort, destinationPort),
 		fmt.Sprintf("%s INPUT %s -p tcp -m tcp --dport %d -j ACCEPT",
@@ -265,12 +229,11 @@ func (c *Config) RedirectPort(ctx context.Context, intf string,
 			appendOrDelete(remove), interfaceFlag, destinationPort),
 	})
 	if err != nil {
-		restore(ctx)
 		return fmt.Errorf("redirecting IPv4 source port %d to destination port %d on interface %s: %w",
 			sourcePort, destinationPort, intf, err)
 	}
 
-	err = c.runIP6tablesInstructionsNoSave(ctx, []string{
+	err = c.runIP6tablesInstructions(ctx, []string{
 		fmt.Sprintf("-t nat %s PREROUTING %s -p tcp --dport %d -j REDIRECT --to-ports %d",
 			appendOrDelete(remove), interfaceFlag, sourcePort, destinationPort),
 		fmt.Sprintf("%s INPUT %s -p tcp -m tcp --dport %d -j ACCEPT",
@@ -281,7 +244,6 @@ func (c *Config) RedirectPort(ctx context.Context, intf string,
 			appendOrDelete(remove), interfaceFlag, destinationPort),
 	})
 	if err != nil {
-		restore(ctx) // just in case
 		errMessage := err.Error()
 		if strings.Contains(errMessage, "can't initialize ip6tables table `nat': Table does not exist") {
 			if !remove {
@@ -295,7 +257,7 @@ func (c *Config) RedirectPort(ctx context.Context, intf string,
 	return nil
 }
 
-func (c *Config) RunUserPostRules(ctx context.Context, filepath string) error {
+func (c *Config) runUserPostRules(ctx context.Context, filepath string, remove bool) error {
 	file, err := os.OpenFile(filepath, os.O_RDONLY, 0)
 	if os.IsNotExist(err) {
 		return nil
@@ -311,15 +273,16 @@ func (c *Config) RunUserPostRules(ctx context.Context, filepath string) error {
 		return err
 	}
 	lines := strings.Split(string(b), "\n")
-
-	c.iptablesMutex.Lock()
-	defer c.iptablesMutex.Unlock()
-
-	restore, err := c.saveAndRestore(ctx)
-	if err != nil {
-		return err
-	}
-
+	successfulRules := []string{}
+	defer func() {
+		// transaction-like rollback
+		if err == nil || ctx.Err() != nil {
+			return
+		}
+		for _, rule := range successfulRules {
+			_ = c.runIptablesInstruction(ctx, flipRule(rule))
+		}
+	}()
 	for _, line := range lines {
 		var ipv4 bool
 		var rule string
@@ -346,18 +309,23 @@ func (c *Config) RunUserPostRules(ctx context.Context, filepath string) error {
 			continue
 		}
 
+		if remove {
+			rule = flipRule(rule)
+		}
+
 		switch {
 		case ipv4:
-			err = c.runIptablesInstructionNoSave(ctx, rule)
+			err = c.runIptablesInstruction(ctx, rule)
 		case c.ip6Tables == "":
 			err = fmt.Errorf("running user ip6tables rule: %w", ErrNeedIP6Tables)
 		default: // ipv6
-			err = c.runIP6tablesInstructionNoSave(ctx, rule)
+			err = c.runIP6tablesInstruction(ctx, rule)
 		}
 		if err != nil {
-			restore(ctx)
 			return err
 		}
+
+		successfulRules = append(successfulRules, rule)
 	}
 	return nil
 }

internal/firewall/iptables/atomic.go

@@ -1,87 +0,0 @@
-package iptables
-
-import (
-	"context"
-	"fmt"
-	"os/exec"
-	"strings"
-)
-
-// SaveAndRestore saves the current iptables and ip6tables rules and
-// returns a restore function that can be called to restore the saved rules.
-func (c *Config) SaveAndRestore(ctx context.Context) (restore func(context.Context), err error) {
-	c.iptablesMutex.Lock()
-	defer c.iptablesMutex.Unlock()
-
-	return c.saveAndRestore(ctx)
-}
-
-// callers MUST always lock both the [Config] iptablesMutex and the ip6tablesMutex
-// before calling this function. Note the restore function does not interact with mutexes
-// so the caller must make sure the mutexes are locked when calling the restore function.
-func (c *Config) saveAndRestore(ctx context.Context) (restore func(context.Context), err error) {
-	restoreIPv4, err := c.saveAndRestoreIPv4(ctx)
-	if err != nil {
-		return nil, err
-	}
-	restoreIPv6, err := c.saveAndRestoreIPv6(ctx)
-	if err != nil {
-		return nil, err
-	}
-
-	restore = func(ctx context.Context) {
-		restoreIPv4(ctx)
-		if restoreIPv6 != nil {
-			restoreIPv6(ctx)
-		}
-	}
-	return restore, nil
-}
-
-// Callers of saveAndRestoreIPv4 MUST always lock the [Config] iptablesMutex
-// before calling this function.
-func (c *Config) saveAndRestoreIPv4(ctx context.Context) (restore func(context.Context), err error) {
-	cmd := exec.CommandContext(ctx, c.ipTables+"-save") //nolint:gosec
-	data, err := c.runner.Run(cmd)
-	if err != nil {
-		return nil, fmt.Errorf("saving IPv4 iptables: %w", err)
-	}
-
-	restore = func(ctx context.Context) {
-		cmd := exec.CommandContext(ctx, c.ipTables+"-restore") //nolint:gosec
-		cmd.Stdin = strings.NewReader(data)
-		output, err := c.runner.Run(cmd)
-		if err != nil {
-			c.logger.Warn(fmt.Sprintf("restoring IPv4 iptables failed: %s", makeRestoreErrorMessage(err, output, data)))
-		}
-	}
-	return restore, nil
-}
-
-// Callers of saveAndRestoreIPv6 MUST always lock the [Config] ip6tablesMutex
-// before calling this function.
-func (c *Config) saveAndRestoreIPv6(ctx context.Context) (restore func(context.Context), err error) {
-	if c.ip6Tables == "" {
-		return nil, nil //nolint:nilnil
-	}
-
-	cmd := exec.CommandContext(ctx, c.ip6Tables+"-save") //nolint:gosec
-	data, err := c.runner.Run(cmd)
-	if err != nil {
-		return nil, fmt.Errorf("saving IPv6 iptables: %w", err)
-	}
-
-	restore = func(ctx context.Context) {
-		cmd = exec.CommandContext(ctx, c.ip6Tables+"-restore") //nolint:gosec
-		cmd.Stdin = strings.NewReader(data)
-		output, err := c.runner.Run(cmd)
-		if err != nil {
-			c.logger.Warn(fmt.Sprintf("restoring IPv6 iptables failed: %s", makeRestoreErrorMessage(err, output, data)))
-		}
-	}
-	return restore, nil
-}
-
-func makeRestoreErrorMessage(err error, output, data string) string {
-	return fmt.Sprintf("%s: %s: restoring from data:\n%s", err, output, data)
-}

internal/firewall/iptables/firewall.go

@@ -1,35 +0,0 @@
-package iptables
-
-import (
-	"context"
-	"sync"
-)
-
-type Config struct {
-	runner        CmdRunner
-	logger        Logger
-	iptablesMutex sync.Mutex
-
-	// Fixed state
-	ipTables  string
-	ip6Tables string
-}
-
-func New(ctx context.Context, runner CmdRunner, logger Logger) (*Config, error) {
-	iptables, err := checkIptablesSupport(ctx, runner, "iptables", "iptables-nft", "iptables-legacy")
-	if err != nil {
-		return nil, err
-	}
-
-	ip6tables, err := findIP6tablesSupported(ctx, runner)
-	if err != nil {
-		return nil, err
-	}
-
-	return &Config{
-		runner:    runner,
-		logger:    logger,
-		ipTables:  iptables,
-		ip6Tables: ip6tables,
-	}, nil
-}

internal/firewall/iptables/interfaces.go

@@ -1,12 +0,0 @@
-package iptables
-
-import "os/exec"
-
-type CmdRunner interface {
-	Run(cmd *exec.Cmd) (output string, err error)
-}
-
-type Logger interface {
-	Debug(s string)
-	Warn(s string)
-}

internal/firewall/iptables/iptablesmix.go

@@ -1,45 +0,0 @@
-package iptables
-
-import (
-	"context"
-)
-
-func (c *Config) runMixedIptablesInstructions(ctx context.Context, instructions []string) error {
-	c.iptablesMutex.Lock()
-	defer c.iptablesMutex.Unlock()
-
-	restore, err := c.saveAndRestore(ctx)
-	if err != nil {
-		return err
-	}
-
-	for _, instruction := range instructions {
-		if err := c.runMixedIptablesInstructionNoSave(ctx, instruction); err != nil {
-			restore(ctx)
-			return err
-		}
-	}
-	return nil
-}
-
-func (c *Config) runMixedIptablesInstruction(ctx context.Context, instruction string) error {
-	c.iptablesMutex.Lock()
-	defer c.iptablesMutex.Unlock()
-
-	restore, err := c.saveAndRestore(ctx)
-	if err != nil {
-		return err
-	}
-	err = c.runMixedIptablesInstructionNoSave(ctx, instruction)
-	if err != nil {
-		restore(ctx)
-	}
-	return err
-}
-
-func (c *Config) runMixedIptablesInstructionNoSave(ctx context.Context, instruction string) error {
-	if err := c.runIptablesInstructionNoSave(ctx, instruction); err != nil {
-		return err
-	}
-	return c.runIP6tablesInstructionNoSave(ctx, instruction)
-}

internal/firewall/iptables/tcp.go

@@ -1,98 +0,0 @@
-package iptables
-
-import (
-	"context"
-	"errors"
-	"fmt"
-	"net/netip"
-	"os"
-)
-
-type tcpFlags struct {
-	mask       []tcpFlag
-	comparison []tcpFlag
-}
-
-type tcpFlag uint8
-
-const (
-	tcpFlagFIN tcpFlag = 1 << iota
-	tcpFlagSYN
-	tcpFlagRST
-	tcpFlagPSH
-	tcpFlagACK
-	tcpFlagURG
-	tcpFlagECE
-	tcpFlagCWR
-)
-
-func (f tcpFlag) String() string {
-	switch f {
-	case tcpFlagFIN:
-		return "FIN"
-	case tcpFlagSYN:
-		return "SYN"
-	case tcpFlagRST:
-		return "RST"
-	case tcpFlagPSH:
-		return "PSH"
-	case tcpFlagACK:
-		return "ACK"
-	case tcpFlagURG:
-		return "URG"
-	case tcpFlagECE:
-		return "ECE"
-	case tcpFlagCWR:
-		return "CWR"
-	default:
-		panic(fmt.Sprintf("%s: %d", errTCPFlagUnknown, f))
-	}
-}
-
-var errTCPFlagUnknown = errors.New("unknown TCP flag")
-
-func parseTCPFlag(s string) (tcpFlag, error) {
-	allFlags := []tcpFlag{
-		tcpFlagFIN, tcpFlagSYN, tcpFlagRST, tcpFlagPSH,
-		tcpFlagACK, tcpFlagURG, tcpFlagECE, tcpFlagCWR,
-	}
-	for _, flag := range allFlags {
-		if s == fmt.Sprintf("%#02x", uint8(flag)) || s == flag.String() {
-			return flag, nil
-		}
-	}
-	return 0, fmt.Errorf("%w: %s", errTCPFlagUnknown, s)
-}
-
-var ErrMarkMatchModuleMissing = errors.New("kernel is missing the mark module libxt_mark.so")
-
-// TempDropOutputTCPRST temporarily drops outgoing TCP RST packets to the specified address and port,
-// for any TCP packets not marked with the excludeMark given.
-// This is necessary for TCP path MTU discovery to work, as the kernel will try to terminate the connection
-// by sending a TCP RST packet, although we want to handle the connection manually.
-func (c *Config) TempDropOutputTCPRST(ctx context.Context,
-	src, dst netip.AddrPort, excludeMark int) (
-	revert func(ctx context.Context) error, err error,
-) {
-	_, err = os.Stat("/usr/lib/xtables/libxt_mark.so")
-	if err != nil && errors.Is(err, os.ErrNotExist) {
-		return nil, fmt.Errorf("%w", ErrMarkMatchModuleMissing)
-	}
-
-	const template = "%s OUTPUT -p tcp -s %s --sport %d -d %s --dport %d " +
-		"--tcp-flags RST RST -m mark ! --mark %d -j DROP" //nolint:dupword
-	instruction := fmt.Sprintf(template, "--append", src.Addr(), src.Port(), dst.Addr(), dst.Port(), excludeMark)
-	revertInstruction := fmt.Sprintf(template, "--delete", src.Addr(), src.Port(), dst.Addr(), dst.Port(), excludeMark)
-	run := c.runIptablesInstruction
-	if dst.Addr().Is6() {
-		run = c.runIP6tablesInstruction
-	}
-	revert = func(ctx context.Context) error {
-		return run(ctx, revertInstruction)
-	}
-	err = run(ctx, instruction)
-	if err != nil {
-		return nil, fmt.Errorf("running instruction: %w", err)
-	}
-	return revert, nil
-}

internal/firewall/iptablesmix.go

@@ -0,0 +1,34 @@
+package firewall
+
+import (
+	"context"
+	"fmt"
+)
+
+func (c *Config) runMixedIptablesInstructions(ctx context.Context, instructions []string) error {
+	for _, instruction := range instructions {
+		if err := c.runMixedIptablesInstruction(ctx, instruction); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (c *Config) runMixedIptablesInstruction(ctx context.Context, instruction string) error {
+	if err := c.runIptablesInstruction(ctx, instruction); err != nil {
+		return err
+	}
+	return c.runIP6tablesInstruction(ctx, instruction)
+}
+
+func (c *Config) runIPv4AndV6IptablesInstructions(ctx context.Context,
+	ipv4Instructions, ipv6Instructions []string,
+) error {
+	if err := c.runIptablesInstructions(ctx, ipv4Instructions); err != nil {
+		return fmt.Errorf("running iptables instructions: %w", err)
+	}
+	if err := c.runIP6tablesInstructions(ctx, ipv6Instructions); err != nil {
+		return fmt.Errorf("running ip6tables instructions: %w", err)
+	}
+	return nil
+}

internal/firewall/list.go

@@ -1,4 +1,4 @@
-package iptables
+package firewall
 
 import (
 	"errors"
@@ -26,18 +26,10 @@ type chainRule struct {
 	inputInterface  string       // input interface, for example "tun0" or "*""
 	outputInterface string       // output interface, for example "eth0" or "*""
 	source          netip.Prefix // source IP CIDR, for example 0.0.0.0/0. Must be valid.
-	sourcePort      uint16       // Not specified if set to zero.
 	destination     netip.Prefix // destination IP CIDR, for example 0.0.0.0/0. Must be valid.
 	destinationPort uint16       // Not specified if set to zero.
 	redirPorts      []uint16     // Not specified if empty.
 	ctstate         []string     // for example ["RELATED","ESTABLISHED"]. Can be empty.
-	tcpFlags        tcpFlags
-	mark            mark
-}
-
-type mark struct {
-	invert bool
-	value  uint
 }
 
 var ErrChainListMalformed = errors.New("iptables chain list output is malformed")
@@ -249,23 +241,19 @@ func parseChainRuleField(fieldIndex int, field string, rule *chainRule) (err err
 }
 
 func parseChainRuleOptionalFields(optionalFields []string, rule *chainRule) (err error) {
-	i := 0
-	for i < len(optionalFields) {
-		switch optionalFields[i] {
-		case "udp":
+	for i := 0; i < len(optionalFields); i++ {
+		key := optionalFields[i]
+		switch key {
+		case "tcp", "udp":
 			i++
-			consumed, err := parseUDPOptional(optionalFields[i:], rule)
+			value := optionalFields[i]
+			value = strings.TrimPrefix(value, "dpt:")
+			const base, bitLength = 10, 16
+			destinationPort, err := strconv.ParseUint(value, base, bitLength)
 			if err != nil {
-				return fmt.Errorf("parsing UDP optional fields: %w", err)
+				return fmt.Errorf("parsing destination port %q: %w", value, err)
 			}
-			i += consumed
-		case "tcp":
-			i++
-			consumed, err := parseTCPOptional(optionalFields[i:], rule)
-			if err != nil {
-				return fmt.Errorf("parsing TCP optional fields: %w", err)
-			}
-			i += consumed
+			rule.destinationPort = uint16(destinationPort)
 		case "redir":
 			i++
 			switch optionalFields[i] {
@@ -276,136 +264,20 @@ func parseChainRuleOptionalFields(optionalFields []string, rule *chainRule) (err
 					return fmt.Errorf("parsing redirection ports: %w", err)
 				}
 				rule.redirPorts = ports
-				i++
 			default:
-				return fmt.Errorf("%w: unexpected %q after redir",
-					ErrChainRuleMalformed, optionalFields[1])
+				return fmt.Errorf("%w: unexpected optional field: %s",
+					ErrChainRuleMalformed, optionalFields[i])
 			}
 		case "ctstate":
 			i++
 			rule.ctstate = strings.Split(optionalFields[i], ",")
-			i++
-		case "mark":
-			i++
-			mark, consumed, err := parseMark(optionalFields[i:])
-			if err != nil {
-				return fmt.Errorf("parsing mark: %w", err)
-			}
-			rule.mark = mark
-			i += consumed
 		default:
-			return fmt.Errorf("%w: unexpected optional field: %s",
-				ErrChainRuleMalformed, optionalFields[i])
+			return fmt.Errorf("%w: unexpected optional field: %s", ErrChainRuleMalformed, key)
 		}
 	}
 	return nil
 }
 
-var errUDPOptionalUnknown = errors.New("unknown UDP optional field")
-
-func parseUDPOptional(optionalFields []string, rule *chainRule) (consumed int, err error) {
-	for _, value := range optionalFields {
-		if !strings.ContainsRune(value, ':') {
-			// no longer a UDP-associated option
-			return consumed, nil
-		}
-		switch {
-		case strings.HasPrefix(value, "dpt:"):
-			rule.destinationPort, err = parseDestinationPort(value)
-			if err != nil {
-				return 0, fmt.Errorf("parsing destination port: %w", err)
-			}
-			consumed++
-		case strings.HasPrefix(value, "spt:"):
-			rule.sourcePort, err = parseSourcePort(value)
-			if err != nil {
-				return 0, fmt.Errorf("parsing source port: %w", err)
-			}
-			consumed++
-		default:
-			return 0, fmt.Errorf("%w: %s", errUDPOptionalUnknown, value)
-		}
-	}
-	return consumed, nil
-}
-
-var errTCPOptionalUnknown = errors.New("unknown TCP optional field")
-
-func parseTCPOptional(optionalFields []string, rule *chainRule) (consumed int, err error) {
-	for _, value := range optionalFields {
-		if !strings.ContainsRune(value, ':') {
-			// no longer a TCP-associated option
-			return consumed, nil
-		}
-		switch {
-		case strings.HasPrefix(value, "dpt:"):
-			rule.destinationPort, err = parseDestinationPort(value)
-			if err != nil {
-				return 0, fmt.Errorf("parsing destination port: %w", err)
-			}
-			consumed++
-		case strings.HasPrefix(value, "spt:"):
-			rule.sourcePort, err = parseSourcePort(value)
-			if err != nil {
-				return 0, fmt.Errorf("parsing source port: %w", err)
-			}
-			consumed++
-		case strings.HasPrefix(value, "flags:"):
-			rule.tcpFlags, err = parseTCPFlags(value)
-			if err != nil {
-				return 0, fmt.Errorf("parsing TCP flags: %w", err)
-			}
-			consumed++
-		default:
-			return 0, fmt.Errorf("%w: %s", errTCPOptionalUnknown, value)
-		}
-	}
-	return consumed, nil
-}
-
-func parseDestinationPort(value string) (port uint16, err error) {
-	value = strings.TrimPrefix(value, "dpt:")
-	return parsePort(value)
-}
-
-func parseSourcePort(value string) (port uint16, err error) {
-	value = strings.TrimPrefix(value, "spt:")
-	return parsePort(value)
-}
-
-var errTCPFlagsMalformed = errors.New("TCP flags are malformed")
-
-func parseTCPFlags(value string) (tcpFlags, error) {
-	value = strings.TrimPrefix(value, "flags:")
-	fields := strings.Split(value, "/")
-	const expectedFields = 2
-	if len(fields) != expectedFields {
-		return tcpFlags{}, fmt.Errorf("%w: expected format 'flags:<mask>/<comparison>' in %q",
-			errTCPFlagsMalformed, value)
-	}
-	maskFlags := strings.Split(fields[0], ",")
-	mask := make([]tcpFlag, len(maskFlags))
-	var err error
-	for i, maskFlag := range maskFlags {
-		mask[i], err = parseTCPFlag(maskFlag)
-		if err != nil {
-			return tcpFlags{}, fmt.Errorf("parsing TCP mask flags: %w", err)
-		}
-	}
-	comparisonFlags := strings.Split(fields[1], ",")
-	comparison := make([]tcpFlag, len(comparisonFlags))
-	for i, comparisonFlag := range comparisonFlags {
-		comparison[i], err = parseTCPFlag(comparisonFlag)
-		if err != nil {
-			return tcpFlags{}, fmt.Errorf("parsing TCP comparison flags: %w", err)
-		}
-	}
-	return tcpFlags{
-		mask:       mask,
-		comparison: comparison,
-	}, nil
-}
-
 func parsePortsCSV(s string) (ports []uint16, err error) {
 	if s == "" {
 		return nil, nil
@@ -414,40 +286,16 @@ func parsePortsCSV(s string) (ports []uint16, err error) {
 	fields := strings.Split(s, ",")
 	ports = make([]uint16, len(fields))
 	for i, field := range fields {
-		ports[i], err = parsePort(field)
+		const base, bitLength = 10, 16
+		port, err := strconv.ParseUint(field, base, bitLength)
 		if err != nil {
-			return nil, err
+			return nil, fmt.Errorf("parsing port %q: %w", field, err)
 		}
+		ports[i] = uint16(port)
 	}
 	return ports, nil
 }
 
-var errMarkValueMalformed = errors.New("mark value is malformed")
-
-func parseMark(optionalFields []string) (m mark, consumed int, err error) {
-	switch optionalFields[consumed] {
-	case "match":
-		consumed++
-		if optionalFields[consumed] == "!" {
-			m.invert = true
-			consumed++
-		}
-
-		const base = 0 // auto-detect
-		const bits = 32
-		value, err := strconv.ParseUint(optionalFields[consumed], base, bits)
-		if err != nil {
-			return mark{}, 0, fmt.Errorf("%w: %s", errMarkValueMalformed, optionalFields[consumed])
-		}
-		m.value = uint(value)
-		consumed++
-	default:
-		return mark{}, 0, fmt.Errorf("%w: unexpected mark mode field: %s",
-			ErrChainRuleMalformed, optionalFields[consumed])
-	}
-	return m, consumed, nil
-}
-
 var ErrLineNumberIsZero = errors.New("line number is zero")
 
 func parseLineNumber(s string) (n uint16, err error) {

internal/firewall/list_test.go

@@ -1,4 +1,4 @@
-package iptables
+package firewall
 
 import (
 	"net/netip"

internal/firewall/mocks_generate_test.go

@@ -1,3 +1,3 @@
-package iptables
+package firewall
 
 //go:generate mockgen -destination=mocks_test.go -package $GOPACKAGE . CmdRunner,Logger

internal/firewall/mocks_test.go

@@ -1,8 +1,8 @@
 // Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/qdm12/gluetun/internal/firewall/iptables (interfaces: CmdRunner,Logger)
+// Source: github.com/qdm12/gluetun/internal/firewall (interfaces: CmdRunner,Logger)
 
-// Package iptables is a generated GoMock package.
-package iptables
+// Package firewall is a generated GoMock package.
+package firewall
 
 import (
 	exec "os/exec"
@@ -84,6 +84,30 @@ func (mr *MockLoggerMockRecorder) Debug(arg0 interface{}) *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Debug", reflect.TypeOf((*MockLogger)(nil).Debug), arg0)
 }
 
+// Error mocks base method.
+func (m *MockLogger) Error(arg0 string) {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "Error", arg0)
+}
+
+// Error indicates an expected call of Error.
+func (mr *MockLoggerMockRecorder) Error(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Error", reflect.TypeOf((*MockLogger)(nil).Error), arg0)
+}
+
+// Info mocks base method.
+func (m *MockLogger) Info(arg0 string) {
+	m.ctrl.T.Helper()
+	m.ctrl.Call(m, "Info", arg0)
+}
+
+// Info indicates an expected call of Info.
+func (mr *MockLoggerMockRecorder) Info(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Info", reflect.TypeOf((*MockLogger)(nil).Info), arg0)
+}
+
 // Warn mocks base method.
 func (m *MockLogger) Warn(arg0 string) {
 	m.ctrl.T.Helper()

internal/firewall/outboundsubnets.go

@@ -48,7 +48,7 @@ func (c *Config) removeOutboundSubnets(ctx context.Context, subnets []netip.Pref
 			}
 
 			firewallUpdated = true
-			err := c.impl.AcceptOutputFromIPToSubnet(ctx, defaultRoute.NetInterface,
+			err := c.acceptOutputFromIPToSubnet(ctx, defaultRoute.NetInterface,
 				defaultRoute.AssignedIP, subNet, remove)
 			if err != nil {
 				c.logger.Error("cannot remove outdated outbound subnet: " + err.Error())
@@ -77,7 +77,7 @@ func (c *Config) addOutboundSubnets(ctx context.Context, subnets []netip.Prefix)
 			}
 
 			firewallUpdated = true
-			err := c.impl.AcceptOutputFromIPToSubnet(ctx, defaultRoute.NetInterface,
+			err := c.acceptOutputFromIPToSubnet(ctx, defaultRoute.NetInterface,
 				defaultRoute.AssignedIP, subnet, remove)
 			if err != nil {
 				return err

internal/firewall/parse.go

@@ -1,4 +1,4 @@
-package iptables
+package firewall
 
 import (
 	"errors"
@@ -9,22 +9,30 @@ import (
 	"strings"
 )
 
+type operation uint8
+
+const (
+	opNone operation = iota
+	opAppend
+	opDelete
+	opInsert
+	opReplace
+)
+
 type iptablesInstruction struct {
 	table           string // defaults to "filter", and can be "nat" for example.
-	append          bool
+	operation       operation
 	chain           string       // for example INPUT, PREROUTING. Cannot be empty.
 	target          string       // for example ACCEPT. Can be empty.
 	protocol        string       // "tcp" or "udp" or "" for all protocols.
 	inputInterface  string       // for example "tun0" or "" for any interface.
 	outputInterface string       // for example "tun0" or "" for any interface.
 	source          netip.Prefix // if not valid, then it is unspecified.
-	sourcePort      uint16       // if zero, there is no source port
 	destination     netip.Prefix // if not valid, then it is unspecified.
 	destinationPort uint16       // if zero, there is no destination port
 	toPorts         []uint16     // if empty, there is no redirection
 	ctstate         []string     // if empty, there is no ctstate
-	tcpFlags        tcpFlags
-	mark            mark
+	lineNumber      uint16       // for replace operation, the line number to replace
 }
 
 func (i *iptablesInstruction) setDefaults() {
@@ -46,8 +54,6 @@ func (i *iptablesInstruction) equalToRule(table, chain string, rule chainRule) (
 		return false
 	case i.destinationPort != rule.destinationPort:
 		return false
-	case i.sourcePort != rule.sourcePort:
-		return false
 	case !slices.Equal(i.toPorts, rule.redirPorts):
 		return false
 	case !slices.Equal(i.ctstate, rule.ctstate):
@@ -60,16 +66,63 @@ func (i *iptablesInstruction) equalToRule(table, chain string, rule chainRule) (
 		return false
 	case !ipPrefixesEqual(i.destination, rule.destination):
 		return false
-	case !slices.Equal(i.tcpFlags.mask, rule.tcpFlags.mask) ||
-		!slices.Equal(i.tcpFlags.comparison, rule.tcpFlags.comparison):
-		return false
-	case i.mark != rule.mark:
-		return false
 	default:
 		return true
 	}
 }
 
+func (i *iptablesInstruction) String() string {
+	var sb strings.Builder
+	if i.table != "" && i.table != "filter" {
+		sb.WriteString(fmt.Sprintf("-t %s ", i.table))
+	}
+	switch i.operation {
+	case opNone:
+		panic("no operation specified")
+	case opAppend:
+		sb.WriteString(fmt.Sprintf("--append %s ", i.chain))
+	case opDelete:
+		sb.WriteString(fmt.Sprintf("--delete %s ", i.chain))
+	case opInsert:
+		sb.WriteString(fmt.Sprintf("--insert %s ", i.chain))
+	case opReplace:
+		sb.WriteString(fmt.Sprintf("--replace %s %d ", i.chain, i.lineNumber))
+	}
+	if i.inputInterface != "" {
+		sb.WriteString(fmt.Sprintf("-i %s ", i.inputInterface))
+	}
+	if i.outputInterface != "" {
+		sb.WriteString(fmt.Sprintf("-o %s ", i.outputInterface))
+	}
+	if i.protocol != "" {
+		sb.WriteString(fmt.Sprintf("-p %s ", i.protocol))
+	}
+	if i.source.IsValid() {
+		sb.WriteString(fmt.Sprintf("-s %s ", i.source.String()))
+	}
+	if i.destination.IsValid() {
+		sb.WriteString(fmt.Sprintf("-d %s ", i.destination.String()))
+	}
+	if i.destinationPort != 0 {
+		sb.WriteString(fmt.Sprintf("--dport %d ", i.destinationPort))
+	}
+	if len(i.ctstate) > 0 {
+		sb.WriteString(fmt.Sprintf("--ctstate %s ", strings.Join(i.ctstate, ",")))
+	}
+	if len(i.toPorts) > 0 {
+		var portStrings []string
+		for _, port := range i.toPorts {
+			portStrings = append(portStrings, strconv.FormatUint(uint64(port), 10))
+		}
+		sb.WriteString(fmt.Sprintf("--to-ports %s ", strings.Join(portStrings, ",")))
+	}
+	if i.target != "" {
+		sb.WriteString(fmt.Sprintf("-j %s ", i.target))
+	}
+
+	return strings.TrimSpace(sb.String())
+}
+
 // instruction can be "" which equivalent to the "*" chain rule interface.
 func networkInterfacesEqual(instruction, chainRule string) bool {
 	return instruction == chainRule || (instruction == "" && chainRule == "*")
@@ -102,39 +155,53 @@ func parseIptablesInstruction(s string) (instruction iptablesInstruction, err er
 }
 
 func parseInstructionFlag(fields []string, instruction *iptablesInstruction) (consumed int, err error) {
-	consumed, err = preCheckInstructionFields(fields)
-	if err != nil {
-		return 0, err
-	}
 	flag := fields[0]
+
+	// All flags use one value after the flag, except the following:
+	switch flag {
+	case "-R", "--replace":
+		const expected = 3
+		if len(fields) < expected {
+			return 0, fmt.Errorf("%w: flag %q requires at least 2 values, but got %s",
+				ErrIptablesCommandMalformed, flag, strings.Join(fields, " "))
+		}
+		consumed = expected
+	default:
+		const expected = 2
+		if len(fields) < expected {
+			return 0, fmt.Errorf("%w: flag %q requires a value, but got none",
+				ErrIptablesCommandMalformed, flag)
+		}
+		consumed = expected
+	}
 	value := fields[1]
 
 	switch flag {
 	case "-t", "--table":
 		instruction.table = value
 	case "-D", "--delete":
-		instruction.append = false
+		instruction.operation = opDelete
 		instruction.chain = value
 	case "-A", "--append":
-		instruction.append = true
+		instruction.operation = opAppend
 		instruction.chain = value
+	case "-I", "--insert":
+		instruction.operation = opInsert
+		instruction.chain = value
+	case "-R", "--replace":
+		instruction.operation = opReplace
+		instruction.chain = value
+		const base, bits = 10, 16
+		n, err := strconv.ParseUint(fields[2], base, bits)
+		if err != nil {
+			return 0, fmt.Errorf("parsing line number for --replace operation: %w", err)
+		}
+		instruction.lineNumber = uint16(n)
 	case "-j", "--jump":
 		instruction.target = value
 	case "-p", "--protocol":
 		instruction.protocol = value
-	case "-m", "--match":
-		consumed, err = parseMatchModule(fields, instruction)
-		if err != nil {
-			return 0, fmt.Errorf("parsing match module: %w", err)
-		}
-	case "--mark":
-		const base = 0 // auto-detect
-		const bits = 32
-		value, err := strconv.ParseUint(value, base, bits)
-		if err != nil {
-			return 0, fmt.Errorf("parsing mark value %q: %w", fields[2], err)
-		}
-		instruction.mark.value = uint(value)
+	case "-m", "--match": // ignore match
 	case "-i", "--in-interface":
 		instruction.inputInterface = value
 	case "-o", "--out-interface":
@@ -144,61 +211,37 @@ func parseInstructionFlag(fields []string, instruction *iptablesInstruction) (co
 		if err != nil {
 			return 0, fmt.Errorf("parsing source IP CIDR: %w", err)
 		}
-	case "--sport":
-		instruction.sourcePort, err = parsePort(value)
-		if err != nil {
-			return 0, fmt.Errorf("parsing source port: %w", err)
-		}
 	case "-d", "--destination":
 		instruction.destination, err = parseIPPrefix(value)
 		if err != nil {
 			return 0, fmt.Errorf("parsing destination IP CIDR: %w", err)
 		}
 	case "--dport":
-		instruction.destinationPort, err = parsePort(value)
+		const base, bitLength = 10, 16
+		destinationPort, err := strconv.ParseUint(value, base, bitLength)
 		if err != nil {
 			return 0, fmt.Errorf("parsing destination port: %w", err)
 		}
+		instruction.destinationPort = uint16(destinationPort)
 	case "--ctstate":
 		instruction.ctstate = strings.Split(value, ",")
 	case "--to-ports":
-		instruction.toPorts, err = parseToPorts(value)
-		if err != nil {
-			return 0, fmt.Errorf("parsing port redirection: %w", err)
-		}
-	case "--tcp-flags":
-		mask, comparison := value, fields[2]
-		instruction.tcpFlags, err = parseTCPFlags(mask + "/" + comparison)
-		if err != nil {
-			return 0, fmt.Errorf("parsing TCP flags: %w", err)
+		portStrings := strings.Split(value, ",")
+		instruction.toPorts = make([]uint16, len(portStrings))
+		for i, portString := range portStrings {
+			const base, bitLength = 10, 16
+			port, err := strconv.ParseUint(portString, base, bitLength)
+			if err != nil {
+				return 0, fmt.Errorf("parsing port redirection: %w", err)
+			}
+			instruction.toPorts[i] = uint16(port)
 		}
 	default:
-		return 0, fmt.Errorf("%w: unknown key %q", ErrIptablesCommandMalformed, flag)
+		return 0, fmt.Errorf("%w: unknown flag %q", ErrIptablesCommandMalformed, flag)
 	}
 	return consumed, nil
 }
 
-func preCheckInstructionFields(fields []string) (consumed int, err error) {
-	flag := fields[0]
-	// All flags use one value after the flag, except the following:
-	switch flag {
-	case "--tcp-flags": // -m can have 1 or 2 values
-		const expected = 3
-		if len(fields) < expected {
-			return 0, fmt.Errorf("%w: flag %q requires at least 2 values, but got %s",
-				ErrIptablesCommandMalformed, flag, strings.Join(fields, " "))
-		}
-		return expected, nil
-	default:
-		const expected = 2
-		if len(fields) < expected {
-			return 0, fmt.Errorf("%w: flag %q requires a value, but got none",
-				ErrIptablesCommandMalformed, flag)
-		}
-		return expected, nil
-	}
-}
-
 func parseIPPrefix(value string) (prefix netip.Prefix, err error) {
 	slashIndex := strings.Index(value, "/")
 	if slashIndex >= 0 {
@@ -211,52 +254,3 @@ func parseIPPrefix(value string) (prefix netip.Prefix, err error) {
 	}
 	return netip.PrefixFrom(ip, ip.BitLen()), nil
 }
-
-func parsePort(value string) (port uint16, err error) {
-	const base, bitLength = 10, 16
-	portValue, err := strconv.ParseUint(value, base, bitLength)
-	if err != nil {
-		return 0, err
-	}
-	return uint16(portValue), nil
-}
-
-func parseMatchModule(fields []string, instruction *iptablesInstruction) (
-	consumed int, err error,
-) {
-	_ = fields[consumed] // -m or --match flag already detected
-	consumed++
-	switch fields[consumed] {
-	case "tcp", "udp":
-		consumed++
-		// for now ignore the protocol match since it's auto-loaded
-		// when parsing the -p/--protocol flag, and we don't need to
-		// parse it twice.
-	case "mark":
-		consumed++
-		switch fields[consumed] {
-		case "!":
-			consumed++
-			instruction.mark.invert = true
-		default:
-			return consumed, fmt.Errorf("%w: unsupported match mark with value: %s",
-				ErrIptablesCommandMalformed, fields[2])
-		}
-	default:
-		return 0, fmt.Errorf("%w: unknown match value: %s",
-			ErrIptablesCommandMalformed, fields[consumed])
-	}
-	return consumed, nil
-}
-
-func parseToPorts(value string) (toPorts []uint16, err error) {
-	portStrings := strings.Split(value, ",")
-	toPorts = make([]uint16, len(portStrings))
-	for i, portString := range portStrings {
-		toPorts[i], err = parsePort(portString)
-		if err != nil {
-			return nil, err
-		}
-	}
-	return toPorts, nil
-}

internal/firewall/parse_test.go

@@ -1,4 +1,4 @@
-package iptables
+package firewall
 
 import (
 	"net/netip"
@@ -28,14 +28,14 @@ func Test_parseIptablesInstruction(t *testing.T) {
 		"unknown_key": {
 			s:          "-x something",
 			errWrapped: ErrIptablesCommandMalformed,
-			errMessage: "parsing \"-x something\": iptables command is malformed: unknown key \"-x\"",
+			errMessage: "parsing \"-x something\": iptables command is malformed: unknown flag \"-x\"",
 		},
 		"one_pair": {
-			s: "-A INPUT",
+			s: "-I INPUT",
 			instruction: iptablesInstruction{
-				table:  "filter",
-				chain:  "INPUT",
-				append: true,
+				table:     "filter",
+				chain:     "INPUT",
+				operation: opInsert,
 			},
 		},
 		"instruction_A": {
@@ -43,7 +43,7 @@ func Test_parseIptablesInstruction(t *testing.T) {
 			instruction: iptablesInstruction{
 				table:           "filter",
 				chain:           "INPUT",
-				append:          true,
+				operation:       opAppend,
 				inputInterface:  "tun0",
 				protocol:        "tcp",
 				source:          netip.MustParsePrefix("1.2.3.4/32"),
@@ -57,7 +57,7 @@ func Test_parseIptablesInstruction(t *testing.T) {
 			instruction: iptablesInstruction{
 				table:           "nat",
 				chain:           "PREROUTING",
-				append:          false,
+				operation:       opDelete,
 				inputInterface:  "tun0",
 				protocol:        "tcp",
 				destinationPort: 43716,

internal/firewall/ports.go

@@ -3,6 +3,7 @@ package firewall
 import (
 	"context"
 	"fmt"
+	"net/netip"
 	"strconv"
 )
 
@@ -35,7 +36,7 @@ func (c *Config) SetAllowedPort(ctx context.Context, port uint16, intf string) (
 	c.logger.Info("setting allowed input port " + fmt.Sprint(port) + " through interface " + intf + "...")
 
 	const remove = false
-	if err := c.impl.AcceptInputToPort(ctx, intf, port, remove); err != nil {
+	if err := c.acceptInputToPort(ctx, intf, port, remove); err != nil {
 		return fmt.Errorf("allowing input to port %d through interface %s: %w",
 			port, intf, err)
 	}
@@ -68,7 +69,7 @@ func (c *Config) RemoveAllowedPort(ctx context.Context, port uint16) (err error)
 
 	const remove = true
 	for netInterface := range interfacesSet {
-		err := c.impl.AcceptInputToPort(ctx, netInterface, port, remove)
+		err := c.acceptInputToPort(ctx, netInterface, port, remove)
 		if err != nil {
 			return fmt.Errorf("removing allowed port %d on interface %s: %w",
 				port, netInterface, err)
@@ -81,3 +82,133 @@ func (c *Config) RemoveAllowedPort(ctx context.Context, port uint16) (err error)
 
 	return nil
 }
+
+// RestrictOutputAddrPort allows outgoing traffic to a specific IP and port for both tcp and udp,
+// while blocking other tcp or udp traffic to that port going to other IP addresses, both IPv4 and IPv6.
+// If the port was previously allowed for another IP address, that previous allowance will be removed.
+// Giving an invalid address will remove any existing restrictions for the port specified.
+func (c *Config) RestrictOutputAddrPort(ctx context.Context, addrPort netip.AddrPort) (err error) {
+	c.stateMutex.Lock()
+	defer c.stateMutex.Unlock()
+	existingIP := c.outputAddrPort[addrPort.Port()]
+
+	switch {
+	case existingIP == addrPort.Addr():
+		return nil
+	case !addrPort.Addr().IsValid():
+		// invalid address, remove any existing rules for the port
+		return c.removeOutputAddrPortRestriction(ctx, existingIP, addrPort.Port())
+	case !existingIP.IsValid():
+		// no previous existing address for the port
+		return c.insertOutputAddrPortRestriction(ctx, addrPort)
+	default:
+		// existing rule in the same IP family or different family
+		return c.replaceOutputAddrPortRestriction(ctx, existingIP, addrPort)
+	}
+}
+
+func (c *Config) removeOutputAddrPortRestriction(ctx context.Context, existingIP netip.Addr, port uint16) (err error) {
+	commonInstructions := []string{
+		fmt.Sprintf("--delete OUTPUT -p udp --dport %d -j DROP", port),
+		fmt.Sprintf("--delete OUTPUT -p tcp --dport %d -j DROP", port),
+	}
+	ipv4Instructions := commonInstructions
+	ipv6Instructions := commonInstructions
+
+	familySpecificInstructions := []string{
+		fmt.Sprintf("--delete OUTPUT -p udp --dport %d -d %s -j ACCEPT", port, existingIP),
+		fmt.Sprintf("--delete OUTPUT -p tcp --dport %d -d %s -j ACCEPT", port, existingIP),
+	}
+	if existingIP.Is4() {
+		ipv4Instructions = append(ipv4Instructions, familySpecificInstructions...)
+	} else {
+		ipv6Instructions = append(ipv6Instructions, familySpecificInstructions...)
+	}
+
+	err = c.runIPv4AndV6IptablesInstructions(ctx, ipv4Instructions, ipv6Instructions)
+	if err != nil {
+		return err
+	}
+	delete(c.outputAddrPort, port)
+	return nil
+}
+
+func (c *Config) insertOutputAddrPortRestriction(ctx context.Context, addrPort netip.AddrPort) (err error) {
+	commonInstructions := []string{
+		fmt.Sprintf("--insert OUTPUT -p udp --dport %d -j DROP", addrPort.Port()),
+		fmt.Sprintf("--insert OUTPUT -p tcp --dport %d -j DROP", addrPort.Port()),
+	}
+	ipv4Instructions := commonInstructions
+	ipv6Instructions := commonInstructions
+
+	familySpecificInstructions := []string{
+		fmt.Sprintf("--insert OUTPUT -p udp --dport %d -d %s -j ACCEPT", addrPort.Port(), addrPort.Addr()),
+		fmt.Sprintf("--insert OUTPUT -p tcp --dport %d -d %s -j ACCEPT", addrPort.Port(), addrPort.Addr()),
+	}
+	if addrPort.Addr().Is4() {
+		ipv4Instructions = append(ipv4Instructions, familySpecificInstructions...)
+	} else {
+		ipv6Instructions = append(ipv6Instructions, familySpecificInstructions...)
+	}
+	err = c.runIPv4AndV6IptablesInstructions(ctx, ipv4Instructions, ipv6Instructions)
+	if err != nil {
+		return err
+	}
+	c.outputAddrPort[addrPort.Port()] = addrPort.Addr()
+	return nil
+}
+
+func (c *Config) replaceOutputAddrPortRestriction(ctx context.Context,
+	existingIP netip.Addr, addrPort netip.AddrPort,
+) (err error) {
+	for _, protocol := range [...]string{"udp", "tcp"} {
+		switch {
+		case existingIP.Is4() && addrPort.Addr().Is4():
+			oldInstruction := fmt.Sprintf("--insert OUTPUT -p %s --dport %d -d %s -j ACCEPT",
+				protocol, addrPort.Port(), existingIP)
+			newInstruction := fmt.Sprintf("--insert OUTPUT -p %s --dport %d -d %s -j ACCEPT",
+				protocol, addrPort.Port(), addrPort.Addr())
+			err = c.replaceIptablesRule(ctx, oldInstruction, newInstruction)
+			if err != nil {
+				return fmt.Errorf("replacing existing IPv4 rule: %w", err)
+			}
+		case existingIP.Is6() && addrPort.Addr().Is6():
+			oldInstruction := fmt.Sprintf("--insert OUTPUT -p %s --dport %d -d %s -j ACCEPT",
+				protocol, addrPort.Port(), existingIP)
+			newInstruction := fmt.Sprintf("--insert OUTPUT -p %s --dport %d -d %s -j ACCEPT",
+				protocol, addrPort.Port(), addrPort.Addr())
+			err = c.replaceIP6tablesRule(ctx, oldInstruction, newInstruction)
+			if err != nil {
+				return fmt.Errorf("replacing existing IPv6 rule: %w", err)
+			}
+		case existingIP.Is4() && addrPort.Addr().Is6():
+			instruction := fmt.Sprintf("--delete OUTPUT -p %s --dport %d -d %s -j ACCEPT",
+				protocol, addrPort.Port(), existingIP)
+			err = c.runIptablesInstruction(ctx, instruction)
+			if err != nil {
+				return fmt.Errorf("removing existing IPv4 rule: %w", err)
+			}
+			instruction = fmt.Sprintf("--insert OUTPUT -p %s --dport %d -d %s -j ACCEPT",
+				protocol, addrPort.Port(), addrPort.Addr())
+			err = c.runIP6tablesInstruction(ctx, instruction)
+			if err != nil {
+				return fmt.Errorf("inserting new IPv6 rule: %w", err)
+			}
+		case existingIP.Is6() && addrPort.Addr().Is4():
+			instruction := fmt.Sprintf("--delete OUTPUT -p %s --dport %d -d %s -j ACCEPT",
+				protocol, addrPort.Port(), existingIP)
+			err = c.runIP6tablesInstruction(ctx, instruction)
+			if err != nil {
+				return fmt.Errorf("removing existing IPv6 rule: %w", err)
+			}
+			instruction = fmt.Sprintf("--insert OUTPUT -p %s --dport %d -d %s -j ACCEPT",
+				protocol, addrPort.Port(), addrPort.Addr())
+			err = c.runIptablesInstruction(ctx, instruction)
+			if err != nil {
+				return fmt.Errorf("inserting new IPv4 rule: %w", err)
+			}
+		}
+	}
+	c.outputAddrPort[addrPort.Port()] = addrPort.Addr()
+	return nil
+}