Re: Bug#264775: segfaults on hostnames that only have IPv6 addresses

On Di, 2004-08-10 at 11:40, Andras Korn wrote:
> we run bopm on one of the Hungarian IRCNet servers. Unfortunately, it often
> segfaults. Investigating the segfaults, we found that they seem to happen
> when a user connects from a host that only has an AAAA and no A record
> (possibly the mere existence of an AAAA record is enough to trigger the
> bug).

The only way to crash BOPM is passing wrong data through the CONNREGEX.
As BOPM depends on the IP being present in the notices your ircd is
probably the root of this problem. It reports wrong IPs (in this case
probably none at all -- just DNS names) which cause BOPM to crash.

There is no support of IPv6 planned in BOPM, also because of the lack of
IPv6-capable proxies. There are no known IPv6 abuses by now.

You probably have to modify your IRCd to give out slightly changed
connection notices -- which do not match upon the CONNREGEX -- when no
IPv4 address is available.

All hacks to modify BOPM to resolve the requests on its own are
unsupported upstream, and also on Debian.

Regards,
Philipp Kern
Blitzed IRC Network