Add IPv6 support to WebRTC

[synnack]

I run go2rtc on an IPv6-only home assistant, and go2rtc webrtc port does not bind to IPv6 on port 8555, which it should in 2023, when the world has run out of IPv4 and I am definitely too poor for IPv4.

I've tried:

webrtc:
  listen: [::]:8555

But it simply refuses to listen on IPv6 since 1.8.1.

[synnack]

Turns out that 8554 is my mistake. That's the RTSP listener which works correctly for IPv6.

[synnack]

This commit broke my go2rtc:
e4b6851

I wonder why this commit was made..?

[synnack]

This restore commit is unfortunately incomplete: 189f142

[AlexxIT]

Yeah. In 2023 it's hard to get IPv6 working in my country. Never seen it working :)

PS. Commit was made for saving resources on unnecessary IPv6 binding for simple home usage.

[gtxaspec]

confirmed webrtc doesn't work with ipv6. i was wondering why I was having issues!
tcp 0 0 0.0.0.0:8555 0.0.0.0:* LISTEN

@AlexxIT perhaps a toggle to enable or disable ipv6 completely would be useful to save resources for certain situations? In my situation I would disable ipv4 completely =D

[AlexxIT]

I just need to find a way to test IPv6 live. I think go will only bind to available interfaces. Or you can use 0.0.0.0 for IPv4 or [::] for IPv6.

[synnack]

I don't think that currently works, [::] cannot bind if you ask for "tcp4" in webrtc.go

[gtxaspec]

@AlexxIT you can try tunnelbroker.net to get a free tunnel which will give you an ipv6 address you can use over an ipv4 connection, for your testing

[synnack]

You can also test local IPv6 by setting up radvd to use a site-local prefix (for example fc42:a1e4:417::/64 ), to prevent it from setting a default route, set AdvDefaultLifetime to a value of 0. That way you get local IPv6 in your network, without it affecting other connections. Of course the tunnelbroker solution is a better one, that way you get full IPv6 access.

[revellion]

If you need another tester for IPv6 related functionality i can assist aswell. I've got global IPv6 access from my ISP currently since a year and a half back :D

[AlexxIT]

You can test it if you want. This feature was fixed in previous releases