Internal server error when running commands (cmd.cgi)

[Ethan Galstad]

This has been a long-standing problem with the CGIs.  Basically it 
resulted because you weren't specifying the CONTENT_LENGTH 
environment variable.  Anyway, fix was in CVS as of last weekend (I 
think).  Saw the post on google groups and tracked down the issue. :-
)

On 30 Sep 2002 at 14:20, steveneu at visi.com wrote:

>  I created a php script to post or get to itself with variables. php can read 
> params passed to it via GET or POST just fine. 
>  I cut and pasted some forms from nagios to disable/enable a test for a 
> service. I also created a GET URL with the same parameters as contained in the 
> form. The GET links work just fine, the forms which are doing the POST give me 
> an "internal server error" with a "premature end of script headers" entry in 
> the http-error log.
>  Is there a specific apache module that could be flaking out? Did something 
> change in the cgis recently? This all started when I "upgraded" to beta 6. 
> 
> Quoting Nicholas Paufler <npaufler at incentre.net>:
> 
> > Just FYI, when I was experiencing troubles getting Nagios running I found
> > the exact same behavior. I was trying to debug the CGI and while the
> > documentation implied to me I should be using HTTP POST (hence, i set the
> > variables as such) to test, it was segfaulting. Using HTTP get, however,
> > worked just fine.
> > 
> > I did manage to get things working via some combination of restarting
> > apache
> > and Nagios, though, so I'm not sure if there was ever really a problem. I'd
> > venture that the segfault on POST from the commandline is "normal", if not
> > what is expected. So that's probably a bit of a red herring for you.
> > 
> > Have you tried any other CGI's to see whether GET or POST is working with
> > them? If you have mod_php installed it should be trivial to write up a
> > quick
> > script to see if variables are being passed correctly on POST so hopefully
> > you can eliminate either your httpd or nagios as the culprit.
> > 
> > Nicholas Paufler
> > Systems Administrator
> > The Internet Centre
> > 
> > ----- Original Message -----
> > From: "Steve Neuharth" <steveneu at tiny.net>
> > To: <nagios-users at lists.sourceforge.net>
> > Cc: "Blaz Zupan" <blaz at si.FreeBSD.org>
> > Sent: Sunday, September 29, 2002 8:14 AM
> > Subject: Re: [Nagios-users] Internal server error when running commands
> > (cmd.cgi)
> > 
> > 
> > > It appears that the cgi's segfault when I POST to them. I can run them
> > > from a shell everything works fine as long as I GET or HEAD but when I
> > > POST, it dies. Likewise through the browser. If I use any form in nagios
> > > to POST to any nagios CGI, I get the error. If I send the same params
> > > via a GET:
> > >
> > "https://127.0.0.1/nagios/cgi-bin/cmd.cgi?cmd_typ=55&cmd_mod=2&host=ns.visi.
> > com&com_author=Steve%20Neuharth&start_time=09/27/2002%2021:41:53&end_time=09
> > /27/2002%2023:41:53&hours=2&minutes=0&fixed=1"
> > > , the scripts run fine, no segfault.
> > >
> > > mmcclure at pneservices.com wrote:
> > > > Apache's not giving you enough information to really determine what the
> > > > problem is.
> > > >
> > > > Try running /usr/local/share/nagios/cgi-bin//cmd.cgi directly from a
> > > > shell.  You'll have to set some environment variables, but you should
> > be
> > > > able to figure those out from the HTML source and other parts of your
> > > > configuration.
> > > >
> > > > If you still can't figure it out after you have all the enviroment
> > > > variables set up, post the error message, someone will probably know
> > > > what it means.
> > > >
> > > > ----------
> > > > Mike McClure, CCIE # 5125, CISSP # 30232
> > > > PNE Services, Inc.  http://www.pneservices.com
> > > > mmcclure at pneservices.com
> > > > mobile: 913-636-5590
> > > >
> > > >
> > > >>-----Original Message-----
> > > >>From: nagios-users-admin at lists.sourceforge.net [mailto:nagios-users-
> > > >>admin at lists.sourceforge.net] On Behalf Of Steve Neuharth
> > > >>Sent: Thursday, September 26, 2002 6:58 PM
> > > >>To: Steve Neuharth
> > > >>Cc: nagios-users at lists.sourceforge.net
> > > >>Subject: Re: [Nagios-users] Internal server error when running
> > > >
> > > > commands
> > > >
> > > >>(cmd.cgi)
> > > >>
> > > >>So... anybody got any suggestions?
> > > >>
> > > >>Steve Neuharth wrote:
> > > >>
> > > >>>    I have nagios up and running (beats the pants off of BigBrother
> > > >>
> > > >>IMHO).
> > > >>
> > > >>>    I'm running FreeBSD 4.7 and I installed nagios straight from the
> > > >>
> > > >>ports
> > > >>
> > > >>>collection. I have done this several times before and the port
> > > >>>maintainer does a great job of scripting the install so that it
> > > >>
> > > > works
> > > >
> > > >>>"out-of-the-box" as it were.
> > > >>>    All of the cgi's seem to work BUT I get an internal server error
> > > >>
> > > >>when I
> > > >>
> > > >>>try to make cmd.cgi "do stuff" such as adding a comment, scheduling
> > > >>
> > > > a
> > > >
> > > >>>check. My first thought was file perms on the rw directory but I
> > > >>
> > > > cannot
> > > >
> > > >>>find anything wrong after reading the netsaint faq (this info is
> > > >>
> > > > missing
> > > >
> > > >>>from the nagios faq btw).  Here is my var/nagios dir:
> > > >>>
> > > >>>tiny# pwd
> > > >>>/usr/local/var/nagios
> > > >>>tiny# ls -l
> > > >>>total 24502
> > > >>>drwxrwxr-x  2 nagios  nagios      2560 Sep 26 00:00 archives
> > > >>>-rw-rw-r--  1 nagios  nagios         0 Sep 26 00:06 comment.log
> > > >>>-rw-rw-r--  1 nagios  nagios         0 Sep 26 00:06 downtime.log
> > > >>>-rw-rw-r--  1 nagios  nagios   1266212 Sep 26 00:24
> > > >>
> > > > host-perfdata.out
> > > >
> > > >>>-rw-r--r--  1 root    nagios         6 Sep 26 00:06 nagios.lock
> > > >>>-rw-rw-r--  1 nagios  nagios      1991 Sep 26 00:11 nagios.log
> > > >>>drwxrwxr-x  2 nagios  www          512 Sep 26 00:06 rw
> > > >>>-rw-rw-r--  1 nagios  nagios  23766777 Sep 26 00:24
> > > >>
> > > > service-perfdata.out
> > > >
> > > >>>-rw-rw-r--  1 nagios  nagios      3456 Sep 26 00:24 status.log
> > > >>>-rw-r--r--  1 nagios  nagios      2563 Sep 26 00:06 status.sav
> > > >>>
> > > >>>another strange thing is the nagios.cmd file:
> > > >>>tiny# pwd
> > > >>>/usr/local/var/nagios/rw
> > > >>>tiny# ls -l
> > > >>>total 0
> > > >>>prw-rw----  1 nagios  www  0 Sep 26 00:06 nagios.cmd
> > > >>>
> > > >>>why is it a pipe? should it be? maybe, but I thought it was strange.
> > > >>>
> > > >>>When I "submit" something I get "Internal Server Error" and in the
> > > >>>apache log I get:
> > > >>>[Thu Sep 26 00:27:30 2002] [error] [client 192.168.0.1] Premature
> > > >>
> > > > end of
> > > >
> > > >>>script headers: /usr/local/share/nagios/cgi-bin//cmd.cgi
> > > >>>
> > > >>>
> > > >>>
> > > >>>
> > > >>>
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Ethan Galstad,
Nagios Developer
---
Email: nagios at nagios.org
Website: http://www.nagios.org



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