Ubuntu
c-ares package

doesn't return DNS results

Bug #993490 reported by Ryan Schulze
26
This bug affects 5 people
Affects Status Importance Assigned to Milestone
znc
New
Undecided
Unassigned
c-ares (Ubuntu)
Confirmed
Undecided
Unassigned

Bug Description

The ZNC package relies on c-ares for DNS lookups. After updating to precise ZNC was no longer able to do DNS lookups.

The ZNC error message is "Csocket.cpp:267 DNS server returned answer with no data".

strace of what is happening:

recvfrom(5, "\323o\201\200\0\1\0\0\0\0\0\0\3irc\16OnlineGamesNet\3"..., 513, 0, {sa_family=AF_INET6, sin6_port=htons(53), inet_pton(AF_INET6, "2a01:4f8:151:6002::2", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [28]) = 40
recvfrom(4294967295, 0x7fffe94ea740, 513, 0, 0x7fffe94ea950, 0x7fffe94ea73c) = -1 EBADF (Bad file descriptor)

After replacing /usr/lib/x86_64-linux-gnu/libcares.so.2.0.0 with the version from oneric DNS resolv correctly again via c-ares.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: libc-ares2 1.7.5-1
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Wed May 2 14:07:41 2012
InstallationMedia: Ubuntu-Server 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
SourcePackage: c-ares
UpgradeStatus: Upgraded to precise on 2012-05-02 (0 days ago)

Revision history for this message
Ryan Schulze (qfl4-ryan-nryi) wrote :
Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in c-ares (Ubuntu):
status: New → Confirmed
Revision history for this message
fish (discordianfish) wrote :

Can also confirm this bug. It happens for me on a ec2 micro instances with official canonical Ubuntu 12.04 LTS AMI. So it should be easy for anyone to reproduce.

Revision history for this message
Luke Sheldrick (luke-sheldrick) wrote :

This is affecting me too.

Have found http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=658184 however the work around doesn't seem to help me.

Just updated to the latest 12.04, with the following ZNC versions:

luke@n0rty:~$ dpkg -l | grep znc
ii znc 0.206-1 advanced modular IRC bouncer
ii znc-dev 0.206-1 advanced modular IRC bouncer (development headers)
ii znc-extra 0.206-1 extra modules for znc
ii znc-perl 0.206-1 advanced modular IRC bouncer (Perl extension)
ii znc-python 0.206-1 advanced modular IRC bouncer (Python extension)
ii znc-tcl 0.206-1 advanced modular IRC bouncer (Tcl extension)

Revision history for this message
Luke Sheldrick (luke-sheldrick) wrote :

OK, it does seem to work... however have to set it per user in the znc conf.

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