*** This bug is a duplicate of bug 1042275 ***
https://bugs.launchpad.net/bugs/1042275
** This bug has been marked a duplicate of bug 1042275
Please enhance dnsmasq to talk directly to resolvconf and to register only
its actual listening address(es)
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https://bugs.launchpad.net/bugs/1501189
Title:
DNS breaks when port=0 is used in dnsmasq.conf
Status in dnsmasq package in Ubuntu:
Triaged
Bug description:
The following function is defined in /etc/init.d/dnsmasq:
start_resolvconf()
{
# If interface "lo" is explicitly disabled in /etc/default/dnsmasq
# Then dnsmasq won't be providing local DNS, so don't add it to
# the resolvconf server set.
for interface in $DNSMASQ_EXCEPT
do
[ $interface = lo ] && return
done
if [ -x /sbin/resolvconf ] ; then
echo "nameserver 127.0.0.1" | /sbin/resolvconf -a lo.$NAME
fi
return 0
}
When someone puts port=0 in dnsmasq.conf, because e.g. he wants to use it
only as a (proxy)DHCP/TFTP server,
127.0.0.1 is added to resolvconf, and DNS is broken because nothing listens
there.
One workaround is to put DNSMASQ_EXCEPT=lo in /etc/default/dnsmasq.
But that doesn't make much sense, we don't want to exclude some interface,
we're not running a DNS server at all.
So it would be nice if dnsmasq checked if port=0 is defined in its
configuration, and didn't add 127.0.0.1 to resolvconf then.
Sample implementation code, to be inserted before `if [ -x /sbin/resolvconf
]`:
grep -qr port=0 /etc/dnsmasq.d/ /etc/dnsmasq.conf && return
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