Using IPv6 nameserver does not work: "dial udp6: lookup <ip6-addr>: no such host"

[hhoffstaette]

IPv6 support seems to be broken in 1.0.5:

$doggo --debug -6 www.cloudflare.com @2606:4700:4700::1111 
time=2024-10-16T21:14:18.752+02:00 level=DEBUG msg="LoadNameservers: Initial nameservers" nameservers=[2606:4700:4700::1111]
time=2024-10-16T21:14:18.753+02:00 level=DEBUG msg="Added nameserver" nameserver="{Address:[2606:4700:4700:]:1111 Type:udp}"
time=2024-10-16T21:14:18.753+02:00 level=DEBUG msg="LoadNameservers: Final nameservers" nameservers="[{Address:[2606:4700:4700:]:1111 Type:udp}]"
time=2024-10-16T21:14:18.753+02:00 level=DEBUG msg="initiating UDP resolver"
time=2024-10-16T21:14:18.753+02:00 level=DEBUG msg="Attempting to resolve" domain=www.cloudflare.com. ndots=0 nameserver=[2606:4700:4700:]:1111
time=2024-10-16T21:14:18.753+02:00 level=ERROR msg="error in lookup" error="dial udp6: lookup 2606:4700:4700:: no such host"

This happens with both a self-compiled and the prebuilt binary on Linux 6.11.4 (amd64).
My IPv6 support works otherwise.

[hhoffstaette]

At first glance it seems that the address parser seems to have a problem with the compressed IPv6 form, but expanding the address does not help:

$doggo --debug -6 www.cloudflare.com @2606:4700:4700:0:0:0:0:1111
time=2024-10-16T21:19:28.286+02:00 level=DEBUG msg="LoadNameservers: Initial nameservers" nameservers=[2606:4700:4700:0:0:0:0:1111]
time=2024-10-16T21:19:28.286+02:00 level=DEBUG msg="Added nameserver" nameserver="{Address:[2606:4700:4700:0:0:0:0]:1111 Type:udp}"
time=2024-10-16T21:19:28.286+02:00 level=DEBUG msg="LoadNameservers: Final nameservers" nameservers="[{Address:[2606:4700:4700:0:0:0:0]:1111 Type:udp}]"
time=2024-10-16T21:19:28.286+02:00 level=DEBUG msg="initiating UDP resolver"
time=2024-10-16T21:19:28.286+02:00 level=DEBUG msg="Attempting to resolve" domain=www.cloudflare.com. ndots=0 nameserver=[2606:4700:4700:0:0:0:0]:1111
time=2024-10-16T21:19:28.287+02:00 level=ERROR msg="error in lookup" error="dial udp6: lookup 2606:4700:4700:0:0:0:0: no such host"

The last element is consistently cut off.

[matej-vrba]

You need to use square brackets. doggo @[2606:4700:4700::1111] example.com a aaaa

[hhoffstaette]

That works - Thank You! 🚀
Is this documented somewhere? I could not find anything about this when I looked, maybe it could be added to the docs.

[matej-vrba]

Is this documented somewhere?

idk, but it's standard way to specify ipv6 when you need to add e.g. port (because you can't tell if 8080 is port or part of the address in https://2001:db8::1:8080/). Not sure why it's required here.