[Galene] galene on IPv6 only

[Curtis Villamizar <curtis@orleans.occnc.com>]

It looks like galene does not want to work on an IPv6 only server.
This server has no IPv4 address at all, not even loopback 127.0.0.1.
When I use -http [<myprefix>::6106]:8443 it does not bind to that
address.  I do get a UDP bind to a random UDP port.  I see the UDP
range option but it is not clear to me what that is for.

I also get messages related to IPv4-ish stuff.
  Failed to enable mDNS over IPv4:
    (listen udp4 224.0.0.0:5353: socket: protocol not supported)
and
  Relay test failed: timeout 2026/03/19 07:41:38
    Perhaps you didn't configure a TURN server?
  TURN: no public addresses

The second message is benign and only indicates the relayTest() test
has failed even though it should not be run if there is no IPv4.

This is despite both mDNS and TURN supposedly disabled.

This is IPv6 so no need for ICE, STUN, TURN, etc.  There is nothing on
the local lan (its in a datacenter) so no need for mDNS and running
mDNS is *very* bad form in that type of environment.

I should mention that this is FreeBSD inside an IPv6 only jail.

I have patches that get me to connect via tcp6.  See below.  This also
gets rid of the mDNS attempt so that seems tied to the bind previously
not working.  So this is sort of a solved problem.  If instead of
using the IPv6 address inside [] I use the host name, then not solved.
Even though the host has an AAAA DNS record and no A record, the bind
does not work if the host name is specified.  This may be an upstream
problem in the go net library.

This could be solved by doing a DNS lookup and seeing the AAAA record
(and A record if used) and listenning with tcp6 (and tcp4 if A used).
This would be needed anyway if you wanted to be like apache and
support binding to more than one address with one instance of the
server.  It would be a lot cleaner.  Maybe later I'll refile the
patches.

Curtis


--- galene.go.orig	2025-08-09 10:26:35.000000000 -0400
+++ galene.go	2026-03-19 09:42:32.995605000 -0400
@@ -53,6 +53,13 @@
 		"built-in TURN server `address` (\"\" to disable)")
 	flag.Parse()
 
+	log.Printf("httpAddr = %s", httpAddr)
+	if strings.HasPrefix(httpAddr, "[") {
+		group.UseMDNS = false
+		turnserver.Address = ""
+		log.Printf("Using IPv6, disable mDNS and TURN")
+	}
+
 	if udpRange != "" {
 		if strings.ContainsRune(udpRange, '-') {
 			var min, max uint16
@@ -145,7 +152,9 @@
 	terminate := make(chan os.Signal, 1)
 	signal.Notify(terminate, syscall.SIGINT, syscall.SIGTERM)
 
-	go relayTest()
+	if ! strings.HasPrefix(httpAddr, "[") {
+		go relayTest()
+	}
 
 	ticker := time.NewTicker(15 * time.Minute)
 	defer ticker.Stop()

--- webserver/webserver.go.orig	2025-08-09 10:26:35.000000000 -0400
+++ webserver/webserver.go	2026-03-19 08:54:40.982460000 -0400
@@ -72,6 +72,10 @@
 	proto := "tcp"
 	if strings.HasPrefix(address, "/") {
 		proto = "unix"
+	}
+	if strings.HasPrefix(address, "[") {
+		proto = "tcp6"
+		log.Printf("Using IPv6, set proto to tcp6")
 	}
 
 	listener, err := net.Listen(proto, address)