mirror of
https://github.com/qdm12/gluetun.git
synced 2026-07-27 12:56:24 +02:00
Quentin McGaw
d9cc7dcffb
- new directory structure containing manifest.json and one json file per provider, by default. - the manifest.json file can specify a filepath for each vpn provider - each vpn provider json data file can contain the `"preferred": true` field to enforce it is used even if outdated, unless there is a version mismatch - `STORAGE_SERVERS_DIRECTORY_PATH` replaces `STORAGE_FILEPATH` (which is now a migration source only). It sets the directory where server manifest and per-provider JSON files are stored (default: `/gluetun/servers/`). - First-run migration: On startup, gluetun checks for the old /gluetun/servers.json file; if found and no new manifest exists, it automatically migrates all data to /gluetun/servers/ directory structure - Silent fallback: If legacy file isn't found, uses the new directory path normally - Legacy cleanup: After successful migration, attempts to remove the old fat JSON file (logs warning only if removal fails, e.g., read-only bind mounts)
38 lines
1.1 KiB
Go
38 lines
1.1 KiB
Go
package pmtud
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import (
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"github.com/qdm12/gluetun-servers/pkg/constants"
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pconstants "github.com/qdm12/gluetun/internal/pmtud/constants"
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)
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// MaxTheoreticalVPNMTU returns the theoretical maximum MTU for a VPN tunnel
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// given the VPN type, network protocol, and whether IPv6 is used.
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// This is notably useful to skip testing MTU values higher than this value.
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// The function panics if the network or VPN type is unknown.
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func MaxTheoreticalVPNMTU(vpnType, network string, ipv6 bool) uint32 {
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const physicalLinkMTU = pconstants.MaxEthernetFrameSize
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vpnLinkMTU := physicalLinkMTU
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if !ipv6 {
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vpnLinkMTU -= pconstants.IPv4HeaderLength
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} else {
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vpnLinkMTU -= pconstants.IPv6HeaderLength
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}
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switch network {
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case constants.TCP:
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vpnLinkMTU -= pconstants.BaseTCPHeaderLength
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case constants.UDP:
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vpnLinkMTU -= pconstants.UDPHeaderLength
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default:
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panic("unknown network protocol: " + network)
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}
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switch vpnType {
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case constants.Wireguard, constants.AmneziaWg:
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vpnLinkMTU -= pconstants.WireguardHeaderLength
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case constants.OpenVPN:
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vpnLinkMTU -= pconstants.OpenVPNHeaderMaxLength
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default:
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panic("unknown VPN type: " + vpnType)
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}
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return vpnLinkMTU
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}
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