[syslog-ng] [Bug 130] New: Changes to resolv.conf do not apply to DNS resolution

[bugzilla at bugzilla.balabit.com]

https://bugzilla.balabit.com/show_bug.cgi?id=130

           Summary: Changes to resolv.conf do not apply to DNS resolution
           Product: syslog-ng
           Version: 3.0.x
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: unspecified
         Component: syslog-ng
        AssignedTo: bazsi at balabit.hu
        ReportedBy: Kevin.Guthrie at itron.com
Type of the Report: bug
   Estimated Hours: 0.0


This was seen using 3.0.1 on an ARM processor running Linux 2.6.32. It is linked against glibc 2.11.
The unit is an embedded device to run independently. It contains a modem to handle communication with head end systems.
The configuration was set up to to use a fully qualified domain name to a UDP port. The unit was booted up originally with an empty /etc/resolv.conf file. The
syslog-ng daemon was started up prior to the modem establishing a connection. The resolv.conf file is not populated at the time that the syslog-ng daemon is
initialized. Errors in the local log show the DNS failure, as expected. However, after the modem connection is established and the resolv.conf file is updated,
syslog-ng continues to fail DNS resolution.

Attempts to use SIGHUP against the process do not correct the issue. Only killing and restarting the daemon corrects the issue. That should not be necessary.

Based off information found at http://sources.redhat.com/bugzilla/show_bug.cgi?id=3675, syslog-ng needs to call the res_init function in order to allow DNS
resolution to succeed. This could be limited to the SIGHUP handler or prior to any attempt to perform DNS resolution.


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