Details on how to reproduce this are:
Install dnsmasq on ubuntu focal.
Start dnsmasq with for example: dnsmasq --server 8.8.8.8
Try to resolve hosts that are known to not exist on the authoritative name
server that is used with dnsmasq.
for i in srv txt aaaa a aaaa a txt srv; do host -t $i test.foo. 127.0.0.1 |
tail -n 1; done
Host test.foo. not found: 3(NXDOMAIN)
Host test.foo. not found: 3(NXDOMAIN)
Host test.foo. not found: 3(NXDOMAIN)
test.foo has no A record
Host test.foo. not found: 3(NXDOMAIN)
test.foo has no A record
test.foo has no TXT record
test.foo has no SRV record
Expected is that all tests are returning NXDOMAIN but they dont because
of the bug.
Same test on a ubuntu jammy installation with dnsmasq 2.86:
for i in srv txt aaaa a aaaa a txt srv; do host -t $i test.foo. 127.0.0.1 |
tail -n 1; done
Host test.foo. not found: 3(NXDOMAIN)
Host test.foo. not found: 3(NXDOMAIN)
Host test.foo. not found: 3(NXDOMAIN)
Host test.foo. not found: 3(NXDOMAIN)
Host test.foo. not found: 3(NXDOMAIN)
Host test.foo. not found: 3(NXDOMAIN)
Host test.foo. not found: 3(NXDOMAIN)
Host test.foo. not found: 3(NXDOMAIN)
The real world problem where we found this was with the autopath plugin from
coredns in kubernetes. Because dnsmasq in version 2.80 sometimes returns NODATA
the search path of autopath gets interrupted and the name resolution for
normally working records fails.
** Changed in: dnsmasq (Ubuntu Focal)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1995260
Title:
dnsmasq focal 2.80 NODATA instead of NXDOMAIN bug
Status in dnsmasq package in Ubuntu:
Fix Released
Status in dnsmasq source package in Focal:
New
Bug description:
We upgraded our openstack containers which host dnsmasq services from
bionic to focal. With this we got an update of dnsmasq from 2.79 to
2.80 which introduced a bug in our setup where dnsmasq returns NODATA
instead of NXDOMAIN.
This is already fixed upstream with the following commit [1].
The Ubuntu dnsmasq 2.80 package should get a backport with a release
for the focal packages which includes this bug fix.
[1]
https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=162e5e0062ce923c494cc64282f293f0ed64fc10
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1995260/+subscriptions
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