Behavior of the addLocal command for IPV6 is strange

[seitzbg]

• Program: dnsdist
• Issue type: Bug report

Short description

dnsdist doesn't seem to properly parse/error on addLocal IPV6 statements.

Environment

• Operating system: Fedora 26 Server
• Software version: dnsdist-1.1.0-5.fc26.x86_64
• Software source: Fedora

Steps to reproduce

1. Add configuration directive as listed below
2. Start dnsdist
3. Profit

Expected behaviour

dnsdist would start and listen on the ipv6 address provided.

Actual behaviour

dnsdist either failed to start or listened on an incorrect address.

Other information

If you provide a directive like this:

addLocal("2001:19f0:5:2e8:5400:ff:fe1f:ff12:53", true, false)

It produces the following errors

May 29 19:25:54 proxy-nj1dnsdist[19566]: Script starting up!
May 29 19:25:54 proxy-nj1 dnsdist[19566]: Script starting up!
May 29 19:25:54 proxy-nj1 dnsdist[19566]: Configuration '/etc/dnsdist/dnsdist.conf' OK!
May 29 19:25:54 proxy-nj1 dnsdist[19566]: Configuration '/etc/dnsdist/dnsdist.conf' OK!
May 29 19:25:54 proxy-nj1 dnsdist[19567]: Fatal error: Exception thrown by a callback function called by Lua
May 29 19:25:54 proxy-nj1 systemd[1]: dnsdist.service: Main process exited, code=exited, status=1/FAILURE
May 29 19:25:54 proxy-nj1 systemd[1]: Failed to start DNS Loadbalancer.

If you add a shorter directive: addLocal("2001:19f0:5:2e8::5400:53", true, false)

It starts up and listens on:

tcp6 0 0 2001:19f0:5:2e8::540:53 :::* LISTEN 20150/dnsdist

Clearly the proper syntax for IPV6 is:

[ipv6_address]:port, which works as expected.

[stbuehler]

I'm guessing ::5400: vs ::540: is just a typo, and not what really happend, right?

[seitzbg]

no, the listen address was definitely ::540:53, that was from netstat.

[stbuehler]

Ah right. Please use the --wide/-W option with netstat.

[seitzbg]

This has been fixed in master.