[Nagiosplug-devel] [ nagiosplug-Bugs-1469472 ] check_ping dns lookup problem

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Bugs item #1469472, was opened at 2006-04-12 21:42
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Category: General plugin execution
Group: Release (specify)
Status: Open
Resolution: None
Priority: 5
Submitted By: nsturm (nsturm)
Assigned to: Nobody/Anonymous (nobody)
Summary: check_ping dns lookup problem

Initial Comment:
This is on 1.4.2.

check_ping and maybe other plugins, first set their
SIGARLM timeout and then do an unconditional dns lookup
on the address provided, even if it is an IP.

Besides the dns lookup on the IP address is useless to
the best of my knowledge, it can timeout, which the code
does not handle.

If the dns lookup does time out, fileno(child_process)
in popen_timeout_alarm_handler() will segfault.

A simple workaround, which is BAD BAD BAD, is attached.
The proper solution would be to rewrite this piece of
code (and similar ones on other modules) to correctly
deal with the dns timeout.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=397597&aid=1469472&group_id=29880