Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

.github/workflows/ci.yml

@@ -129,12 +129,12 @@ jobs:
           secrets.PROTONVPN_OPENVPN_PASSWORD }}" | ./ci/runner
           protonvpn-openvpn-port-forwarding
 
-      - name:
-          Run Gluetun container with Private Internet Access OpenVPN and port
-          forwarding configuration
-        run: echo -e "${{ secrets.PRIVATEINTERNETACCESS_OPENVPN_USER }}\n${{
-          secrets.PRIVATEINTERNETACCESS_OPENVPN_PASSWORD }}" | ./ci/runner
-          private-internet-access-openvpn-port-forwarding
+      # - name:
+      #     Run Gluetun container with Private Internet Access OpenVPN and port
+      #     forwarding configuration
+      #   run: echo -e "${{ secrets.PRIVATEINTERNETACCESS_OPENVPN_USER }}\n${{
+      #     secrets.PRIVATEINTERNETACCESS_OPENVPN_PASSWORD }}" | ./ci/runner
+      #     private-internet-access-openvpn-port-forwarding
 
       - name: Run Gluetun container with AirVPN Wireguard configuration
         run: echo -e "${{ secrets.AIRVPN_WIREGUARD_PRIVATE_KEY }}\n${{

Dockerfile

@@ -276,7 +276,7 @@ ENV VPN_SERVICE_PROVIDER=pia \
     PUID=1000 \
     PGID=1000
 ENTRYPOINT ["/gluetun-entrypoint"]
-EXPOSE 8000/tcp 8888/tcp 8388/tcp 8388/udp 1080/tcp
+EXPOSE 8000/tcp 8888/tcp 8388/tcp 8388/udp 1080/tcp 1080/udp
 HEALTHCHECK --interval=5s --timeout=5s --start-period=10s --retries=3 CMD /gluetun-entrypoint healthcheck
 ARG TARGETPLATFORM
 RUN apk add --no-cache --update -l wget && \

README.md

@@ -73,7 +73,7 @@ Lightweight swiss-army-knife-like VPN client to multiple VPN service providers
 - Choose the vpn network protocol, `udp` or `tcp`
 - Built in firewall kill switch to allow traffic only with needed the VPN servers and LAN devices
 - Built in Shadowsocks proxy server (protocol based on SOCKS5 with an encryption layer, tunnels TCP+UDP)
-- Built in Socks5 proxy server (tunnels TCP) - partial credits to @angelakis and @adjscent
+- Built in Socks5 proxy server (tunnels TCP+UDP) - partial credits to @angelakis and @adjscent
 - Built in HTTP proxy (tunnels HTTP and HTTPS through TCP)
 - [Connect other containers to it](https://github.com/qdm12/gluetun-wiki/blob/main/setup/connect-a-container-to-gluetun.md)
 - [Connect LAN devices to it](https://github.com/qdm12/gluetun-wiki/blob/main/setup/connect-a-lan-device-to-gluetun.md)

internal/provider/custom/openvpnconf.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"github.com/qdm12/gluetun/internal/configuration/settings"
+	"github.com/qdm12/gluetun/internal/constants"
 	"github.com/qdm12/gluetun/internal/constants/openvpn"
 	"github.com/qdm12/gluetun/internal/models"
 	"github.com/qdm12/gluetun/internal/provider/utils"
@@ -65,7 +66,11 @@ func modifyConfig(lines []string, connection models.Connection,
 	}
 
 	// Add values
-	modified = append(modified, "proto "+connection.Protocol)
+	protocol := connection.Protocol
+	if protocol == constants.TCP {
+		protocol = "tcp-client"
+	}
+	modified = append(modified, "proto "+protocol)
 	modified = append(modified, fmt.Sprintf("remote %s %d", connection.IP, connection.Port))
 	modified = append(modified, "dev "+settings.Interface)
 	modified = append(modified, "mute-replay-warnings")

internal/socks5/socks5.go

@@ -10,6 +10,7 @@ import (
 	"net/netip"
 	"strconv"
 	"strings"
+	"sync"
 )
 
 var (
@@ -210,13 +211,6 @@ func (c *socksConn) handleUDPAssociateRequest(ctx context.Context,
 		return fmt.Errorf("getting udp association addresses: %w", err)
 	}
 
-	err = c.encodeSuccessResponse(c.clientConn, socksVersion, succeeded,
-		bindAddrType, bindAddress, bindPort)
-	if err != nil {
-		c.encodeFailedResponse(c.clientConn, socksVersion, generalServerFailure)
-		return fmt.Errorf("writing successful %s response: %w", udpAssociate, err)
-	}
-
 	association, err := c.udpRouter.registerAssociation(c.clientConn, expectedAddrPort)
 	if err != nil {
 		c.encodeFailedResponse(c.clientConn, socksVersion, generalServerFailure)
@@ -224,21 +218,28 @@ func (c *socksConn) handleUDPAssociateRequest(ctx context.Context,
 	}
 	defer c.udpRouter.unregisterAssociation(association)
 
+	err = c.encodeSuccessResponse(c.clientConn, socksVersion, succeeded,
+		bindAddrType, bindAddress, bindPort)
+	if err != nil {
+		c.encodeFailedResponse(c.clientConn, socksVersion, generalServerFailure)
+		return fmt.Errorf("writing successful %s response: %w", udpAssociate, err)
+	}
+
 	associationCtx, associationCancel := context.WithCancel(ctx)
 	defer associationCancel()
 
-	handlerDone := make(chan struct{})
-	go func() {
-		defer close(handlerDone)
-		c.udpRouter.runAssociationHandler(associationCtx, association)
-	}()
+	var wg sync.WaitGroup
 
-	go func() {
+	wg.Go(func() {
+		c.udpRouter.runAssociationHandler(associationCtx, association)
+	})
+
+	wg.Go(func() {
 		_, _ = io.Copy(io.Discard, c.clientConn)
 		associationCancel()
-	}()
+	})
 	<-associationCtx.Done()
-	<-handlerDone
+	wg.Wait()
 	return nil
 }
 

internal/socks5/udp_router.go

@@ -48,7 +48,7 @@ func newUDPRouter(ctx context.Context, address string, logger Logger) (router *u
 		listener: listener,
 		bufferPool: sync.Pool{
 			New: func() any {
-				return bytes.NewBuffer(make([]byte, pooledUDPPacketBufferCapacity))
+				return bytes.NewBuffer(make([]byte, 0, pooledUDPPacketBufferCapacity))
 			},
 		},
 		nextAssociationID:             1,
@@ -111,10 +111,6 @@ func (r *udpRouter) unregisterAssociation(association udpAssociation) {
 		delete(r.clientAddrPortToAssociation, clientAddrPort)
 	}
 
-	if association.clientAddrPort.IsValid() {
-		delete(r.clientAddrPortToAssociation, association.clientAddrPort)
-	}
-
 	pendingAssociations := r.clientIPToPendingAssociations[association.controlConnAddr]
 	for i, pendingAssociation := range pendingAssociations {
 		if pendingAssociation.id == association.id {
@@ -163,8 +159,9 @@ func (r *udpRouter) run(ctx context.Context) error {
 
 func (r *udpRouter) routePacket(sourceAddrPort netip.AddrPort, packet *bytes.Buffer) error {
 	r.mutex.Lock()
-	defer r.mutex.Unlock()
 	association, packetFromClient := r.findClientAssociation(sourceAddrPort)
+	r.mutex.Unlock()
+
 	if !packetFromClient {
 		r.bufferPool.Put(packet)
 		return nil
@@ -334,6 +331,23 @@ func (r *udpRouter) writeClientPacketToDestination(ctx context.Context,
 		return fmt.Errorf("decoding UDP datagram: %w", err)
 	}
 
+	host, portStr, err := net.SplitHostPort(destination)
+	if err != nil {
+		return fmt.Errorf("splitting destination host and port: %w", err)
+	}
+
+	if _, err := netip.ParseAddr(host); err != nil { // domain name
+		addrs, err := net.DefaultResolver.LookupHost(ctx, host)
+		if err != nil {
+			return fmt.Errorf("resolving destination host: %w", err)
+		}
+		if len(addrs) == 0 {
+			return fmt.Errorf("resolving destination host: no addresses found for %q", host)
+		}
+
+		destination = net.JoinHostPort(addrs[0], portStr)
+	}
+
 	resolvedDestinationUDPAddress, err := net.ResolveUDPAddr("udp", destination)
 	if err != nil {
 		return fmt.Errorf("resolving destination UDP address: %w", err)