Forkserver: --max-from-ip/max_conn_ip not working when no specific listening interface is defined

[wornet-aer]

Today I discovered a strange behaviour:
qpsmtpd was not blocking too many connections from the same ip address, even with --limit-connections=60 --max-from-ip=6 specified. The overall maximum connection limit of 60 was correctly respected though. I was having the hosts_allow plugin enable and didn't need to change much to fix it: I just had to explicitly specify the public ip address of my system instead of leaving --listen-address empty.

I'm not sure yet, if this is a bug within the forkserver or the plugin. The hosts_allow plugin recognizes every connection as the first one of the client host, which means the wrong behaviour has to do with the following lines:

qpsmtpd/plugins/hosts_allow

Lines 74 to 78 in d3cf60d

	my $num_conn = 1; # seed with current value
	my $raddr = inet_aton($remote);
	foreach my $rip (@{$args{child_addrs}}) {
	++$num_conn if (defined $rip && $rip eq $raddr);
	}

Maybe $args{child_addrs} is not correctly filled when having no specific listening interface defined?

Any thougths, hints or tips are appreciated! :-)

Cheers
Andreas