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TUN inbound: autoSystemDnsToGateway falls back to an IPv6 gateway on Linux

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Without an IPv4 address in gateway, the system DNS now points at the
first IPv6 gateway plus one (e.g. fc00::1/64 -> fc00::2) instead of
nothing, and the routing check before the takeover accepts IPv6
addresses for it.

The README also says what each system does without gateway: Xray
assigns no address on Linux, Windows gives the TUN link-local ones
itself, and macOS and FreeBSD use 169.254.10.1/30.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
patterniha
2026-09-30 07:18:55 +03:30
co-authored by Claude Opus 5.5
parent de02da553a
commit 3a6bdb19ba
4 changed files with 46 additions and 18 deletions
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proxy/tun/tun_linux_dns_test.go
+13 -4
View File
@@ -103,7 +103,7 @@ func TestConfigureSystemDNSNoGateway(t *testing.T) {
t1.options.Gateway = nil
if err := t1.ConfigureSystemDNS(context.Background(), "tun"); err == nil {
t.Fatal("expected an error when no IPv4 gateway is configured")
t.Fatal("expected an error when no gateway is configured")
}
if len(*probes) != 0 {
t.Errorf("routing probe must not run without a gateway, got %d calls", len(*probes))
@@ -351,9 +351,18 @@ func TestSystemDNSAddrs(t *testing.T) {
wantOK: false,
},
{
name: "ipv6 only",
gateway: []string{"fc00::1/64"},
wantOK: false,
name: "ipv6 only",
gateway: []string{"fc00::1/64"},
wantSource: "fc00::1",
wantDNS: "fc00::2",
wantOK: true,
},
{
name: "first ipv6 without ipv4",
gateway: []string{"fc00::1/64", "fd00::1/64"},
wantSource: "fc00::1",
wantDNS: "fc00::2",
wantOK: true,
},
}