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nagios-plugins
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							<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<HTML
><HEAD
><TITLE
>Nagios plug-in development guidelines</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.64
"></HEAD
><BODY
CLASS="BOOK"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="BOOK"
><A
NAME="AEN1"
></A
><DIV
CLASS="TITLEPAGE"
><H1
CLASS="TITLE"
><A
NAME="AEN3"
>Nagios plug-in development guidelines</A
></H1
><H3
CLASS="AUTHOR"
><A
NAME="AEN5"
>Karl DeBisschop</A
></H3
><DIV
CLASS="AFFILIATION"
><DIV
CLASS="ADDRESS"
><P
CLASS="ADDRESS"
>karl@debisschop.net</P
></DIV
></DIV
><H3
CLASS="AUTHOR"
><A
NAME="AEN11"
>Ethan Galstad</A
></H3
><DIV
CLASS="AFFILIATION"
><DIV
CLASS="ADDRESS"
><P
CLASS="ADDRESS"
>netsaint@linuxbox.com</P
></DIV
></DIV
><H3
CLASS="AUTHOR"
><A
NAME="AEN21"
>Hugo Gayosso</A
></H3
><DIV
CLASS="AFFILIATION"
><DIV
CLASS="ADDRESS"
><P
CLASS="ADDRESS"
>hgayosso@gnu.org</P
></DIV
></DIV
><H3
CLASS="AUTHOR"
><A
NAME="AEN27"
>Subhendu Ghosh</A
></H3
><DIV
CLASS="AFFILIATION"
><DIV
CLASS="ADDRESS"
><P
CLASS="ADDRESS"
>sghosh@sourceforge.net</P
></DIV
></DIV
><H3
CLASS="AUTHOR"
><A
NAME="AEN33"
>Stanley Hopcroft</A
></H3
><DIV
CLASS="AFFILIATION"
><DIV
CLASS="ADDRESS"
><P
CLASS="ADDRESS"
>stanleyhopcroft@sourceforge.net</P
></DIV
></DIV
><P
CLASS="COPYRIGHT"
>Copyright &copy; 2000 2001 2002 by Karl DeBisschop, Ethan Galstad, 
		Hugo Gayosso, Stanley Hopcroft, Subhendu Ghosh</P
><HR></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="#PREFACE"
>About the guidelines</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN51"
>Copyright</A
></DT
></DL
></DD
><DT
><A
HREF="#AEN56"
></A
></DT
><DD
><DL
><DT
><A
HREF="#PLUGOUTPUT"
>Plugin Output for Nagios</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN60"
>Print only one line of text</A
></DT
><DT
><A
HREF="#AEN63"
>Screen Output</A
></DT
><DT
><A
HREF="#AEN67"
>Return the proper status code</A
></DT
><DT
><A
HREF="#AEN71"
>Plugin Return Codes</A
></DT
></DL
></DD
><DT
><A
HREF="#SYSCMDAUXFILES"
>System Commands and Auxiliary Files</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN117"
>Don't execute system commands without specifying their
		full path</A
></DT
><DT
><A
HREF="#AEN121"
>Use spopen() if external commands must be executed</A
></DT
><DT
><A
HREF="#AEN125"
>Don't make temp files unless absolutely required</A
></DT
><DT
><A
HREF="#AEN128"
>Don't be tricked into following symlinks</A
></DT
><DT
><A
HREF="#AEN131"
>Validate all input</A
></DT
></DL
></DD
><DT
><A
HREF="#PERLPLUGIN"
>Perl Plugins</A
></DT
><DT
><A
HREF="#RUNTIME"
>Runtime Timeouts</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN165"
>Use DEFAULT_SOCKET_TIMEOUT</A
></DT
><DT
><A
HREF="#AEN168"
>Add alarms to network plugins</A
></DT
></DL
></DD
><DT
><A
HREF="#PLUGOPTIONS"
>Plugin Options</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN174"
>Option Processing</A
></DT
><DT
><A
HREF="#AEN187"
>Plugins with more than one type of threshold, or with
      threshold ranges</A
></DT
></DL
></DD
><DT
><A
HREF="#SUBMITTINGCHANGES"
>New submissions and patches</A
></DT
></DL
></DD
></DL
></DIV
><DIV
CLASS="PREFACE"
><HR><H1
><A
NAME="PREFACE"
>About the guidelines</A
></H1
><P
>The purpose of this guidelines is to provide a reference for
    the plug-in developers and encourage the standarization of the
    different kind of plug-ins: C, shell, perl, python, etc.</P
><DIV
CLASS="SECTION"
><HR><H1
CLASS="SECTION"
><A
NAME="AEN51"
>Copyright</A
></H1
><P
>Nagios Plug-in Development Guidelines Copyright (C) 2000 2001
		2002
        Karl DeBisschop, Ethan Galstad, Hugo Gayosso, Stanley Hopcroft, 
		Subhendu Ghosh</P
><P
>Permission is granted to make and distribute verbatim
        copies of this manual provided the copyright notice and this
        permission notice are preserved on all copies.</P
><P
>The plugins themselves are copyrighted by their respective
		authors.</P
></DIV
></DIV
><DIV
CLASS="ARTICLE"
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="#PLUGOUTPUT"
>Plugin Output for Nagios</A
></DT
><DT
><A
HREF="#SYSCMDAUXFILES"
>System Commands and Auxiliary Files</A
></DT
><DT
><A
HREF="#PERLPLUGIN"
>Perl Plugins</A
></DT
><DT
><A
HREF="#RUNTIME"
>Runtime Timeouts</A
></DT
><DT
><A
HREF="#PLUGOPTIONS"
>Plugin Options</A
></DT
><DT
><A
HREF="#SUBMITTINGCHANGES"
>New submissions and patches</A
></DT
></DL
></DIV
><DIV
CLASS="SECTION"
><H1
CLASS="SECTION"
><A
NAME="PLUGOUTPUT"
>Plugin Output for Nagios</A
></H1
><P
>You should always print something to STDOUT that tells if the 
		service is working or why its failing. Try to keep the output short - 
		probably less that 80 characters. Remember that you ideally would like 
		the entire output to appear in a pager message, which will get chopped
		off after a certain length.</P
><DIV
CLASS="SECTION"
><HR><H2
CLASS="SECTION"
><A
NAME="AEN60"
>Print only one line of text</A
></H2
><P
>Nagios will only grab the first line of text from STDOUT
		when it notifies contacts about potential problems. If you print
		multiple lines, you're out of luck. Remember, keep it short and
		to the point.</P
></DIV
><DIV
CLASS="SECTION"
><HR><H2
CLASS="SECTION"
><A
NAME="AEN63"
>Screen Output</A
></H2
><P
>The plug-in should print the diagnostic and just the
		synopsis part of the help message.  A well written plugin would
		then have --help as a way to get the verbose help.</P
><P
>Code and output should try to respect the 80x25 size of a
		crt (remember when fixing stuff in the server room!)</P
></DIV
><DIV
CLASS="SECTION"
><HR><H2
CLASS="SECTION"
><A
NAME="AEN67"
>Return the proper status code</A
></H2
><P
>See <A
HREF="#RETURNCODES"
>Table 1 in the section called <I
>Plugin Return Codes</I
></A
> below
		for the numeric values of status codes and their
		description. Remember to return an UNKNOWN state if bogus or
		invalid command line arguments are supplied or it you are unable
		to check the service.</P
></DIV
><DIV
CLASS="SECTION"
><HR><H2
CLASS="SECTION"
><A
NAME="AEN71"
>Plugin Return Codes</A
></H2
><P
>The return codes below are based on the POSIX spec of returning
		a positive value.  Netsaint prior to v0.0.7 supported non-POSIX
		compliant return code of "-1" for unknown.  Nagios supports POSIX return
		codes by default.</P
><P
>Note: Some plugins will on occasion print on STDOUT that an error
		occurred and error code is 138 or 255 or some such number.  These
		are usually caused by plugins using system commands and having not 
		enough checks to catch unexpected output.  Developers should include a
		default catch-all for system command output that returns an UNKOWN
		return code.</P
><DIV
CLASS="TABLE"
><A
NAME="RETURNCODES"
></A
><P
><B
>Table 1. Plugin Return Codes</B
></P
><TABLE
BORDER="1"
BGCOLOR="#E0E0E0"
CELLSPACING="0"
CELLPADDING="4"
CLASS="CALSTABLE"
><THEAD
><TR
><TH
ALIGN="LEFT"
VALIGN="TOP"
><P
>Numeric Value</P
></TH
><TH
ALIGN="LEFT"
VALIGN="TOP"
><P
>Service Status</P
></TH
><TH
ALIGN="LEFT"
VALIGN="TOP"
><P
>Status Description</P
></TH
></TR
></THEAD
><TBODY
><TR
><TD
ALIGN="CENTER"
VALIGN="TOP"
><P
>0</P
></TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
><P
>OK</P
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>The plugin was able to check the service and it 
						appeared to be functioning properly</P
></TD
></TR
><TR
><TD
ALIGN="CENTER"
VALIGN="TOP"
><P
>1</P
></TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
><P
>Warning</P
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>The plugin was able to check the service, but it 
						appeared to be above some "warning" threshold or did not appear 
						to be working properly</P
></TD
></TR
><TR
><TD
ALIGN="CENTER"
VALIGN="TOP"
><P
>2</P
></TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
><P
>Critical</P
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>The plugin detected that either the service was not 
						running or it was above some "critical" threshold</P
></TD
></TR
><TR
><TD
ALIGN="CENTER"
VALIGN="TOP"
><P
>3</P
></TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
><P
>Unknown</P
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>Invalid command line arguments were supplied to the 
						plugin or the plugin was unable to check the status of the given 
						hosts/service</P
></TD
></TR
></TBODY
></TABLE
></DIV
></DIV
></DIV
><DIV
CLASS="SECTION"
><HR><H1
CLASS="SECTION"
><A
NAME="SYSCMDAUXFILES"
>System Commands and Auxiliary Files</A
></H1
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN117"
>Don't execute system commands without specifying their
		full path</A
></H2
><P
>Don't use exec(), popen(), etc. to execute external
		commands without explicity using the full path of the external
		program.</P
><P
>Doing otherwise makes the plugin vulnerable to hijacking
		by a trojan horse earlier in the search path. See the main
		plugin distribution for examples on how this is done.</P
></DIV
><DIV
CLASS="SECTION"
><HR><H2
CLASS="SECTION"
><A
NAME="AEN121"
>Use spopen() if external commands must be executed</A
></H2
><P
>If you have to execute external commands from within your
    	plugin and you're writing it in C, use the spopen() function
		that Karl DeBisschop has written.</P
><P
>The code for spopen() and spclose() is included with the
		core plugin distribution.</P
></DIV
><DIV
CLASS="SECTION"
><HR><H2
CLASS="SECTION"
><A
NAME="AEN125"
>Don't make temp files unless absolutely required</A
></H2
><P
>If temp files are needed, make sure that the plugin will
		fail cleanly if the file can't be written (e.g., too few file
		handles, out of disk space, incorrect permissions, etc.) and
		delete the temp file when processing is complete.</P
></DIV
><DIV
CLASS="SECTION"
><HR><H2
CLASS="SECTION"
><A
NAME="AEN128"
>Don't be tricked into following symlinks</A
></H2
><P
>If your plugin opens any files, take steps to ensure that
		you are not following a symlink to another location on the
		system.</P
></DIV
><DIV
CLASS="SECTION"
><HR><H2
CLASS="SECTION"
><A
NAME="AEN131"
>Validate all input</A
></H2
><P
>use routines in utils.c or utils.pm and write more as needed</P
></DIV
></DIV
><DIV
CLASS="SECTION"
><HR><H1
CLASS="SECTION"
><A
NAME="PERLPLUGIN"
>Perl Plugins</A
></H1
><P
>Perl plugins are coded a little more defensively than other
		plugins because of embedded Perl.  When configured as such, embedded
		Perl Nagios (ePN) requires stricter use of the some of Perl's features.
		This section outlines some of the steps needed to use ePN
		effectively.</P
><P
></P
><OL
TYPE="1"
><LI
><P
> Do not use BEGIN and END blocks since they will be called 
			the first time and when Nagios shuts down with Embedded Perl (ePN).  In 
			particular, do not use BEGIN blocks to initialize variables.</P
></LI
><LI
><P
>To use utils.pm, you need to provide a full path to the
			module in order for it to work with ePN.</P
><P
CLASS="LITERALLAYOUT"
>	&nbsp;&nbsp;e.g.<br>
		use&nbsp;lib&nbsp;"/usr/local/nagios/libexec";<br>
		use&nbsp;utils&nbsp;qw(...);<br>
	&nbsp;&nbsp;</P
></LI
><LI
><P
>Perl scripts should be called with "-w"</P
></LI
><LI
><P
>All Perl plugins must compile cleanly under "use strict" - i.e. at
			least explicitly package names as in "$main::x" or predeclare every
			variable. </P
><P
>Explicitly initialize each varialable in use.  Otherwise with
			caching enabled, the plugin will not be recompilied each time, and
			therefore Perl will not reinitialize all the variables.  All old
			variable values will still be in effect.</P
></LI
><LI
><P
>Do not use &#60; DATA &#62; (these simply do not compile under ePN).</P
></LI
><LI
><P
>Do not use named subroutines</P
></LI
><LI
><P
>If writing to a file (perhaps recording
			performance data) explicitly close close it.  The plugin never
			calls <I
CLASS="EMPHASIS"
>exit</I
>; that is caught by
			p1.pl, so output streams are never closed.</P
></LI
><LI
><P
>As in <A
HREF="#RUNTIME"
>the section called <I
>Runtime Timeouts</I
></A
> all plugins need 
			to monitor their runtime, specially if they are using network
			resources.  Use of the <I
CLASS="EMPHASIS"
>alarm</I
> is recommended.
			Plugins may import a default time out ($TIMEOUT) from utils.pm.
			</P
></LI
><LI
><P
>Perl plugins should import %ERRORS from utils.pm
			and then "exit $ERRORS{'OK'}" rather than "exit 0"
			</P
></LI
></OL
></DIV
><DIV
CLASS="SECTION"
><HR><H1
CLASS="SECTION"
><A
NAME="RUNTIME"
>Runtime Timeouts</A
></H1
><P
>Plugins have a very limited runtime - typically 10 sec.
		As a result, it is very important for plugins to maintain internal
		code to exit if runtime exceeds a threshold. </P
><P
>All plugins should timeout gracefully, not just networking
		plugins. For instance, df may lock if you have automounted
		drives and your network fails - but on first glance, who'd think
		df could lock up like that.  Plus, it should just be more error
		resistant to be able to time out rather than consume
		resources.</P
><DIV
CLASS="SECTION"
><HR><H2
CLASS="SECTION"
><A
NAME="AEN165"
>Use DEFAULT_SOCKET_TIMEOUT</A
></H2
><P
>All network plugins should use DEFAULT_SOCKET_TIMEOUT to timeout</P
></DIV
><DIV
CLASS="SECTION"
><HR><H2
CLASS="SECTION"
><A
NAME="AEN168"
>Add alarms to network plugins</A
></H2
><P
>If you write a plugin which communicates with another
		networked host, you should make sure to set an alarm() in your
		code that prevents the plugin from hanging due to abnormal
		socket closures, etc. Nagios takes steps to protect itself
		against unruly plugins that timeout, but any plugins you create
		should be well behaved on their own.</P
></DIV
></DIV
><DIV
CLASS="SECTION"
><HR><H1
CLASS="SECTION"
><A
NAME="PLUGOPTIONS"
>Plugin Options</A
></H1
><P
>A well written plugin should have --help as a way to get 
		verbose help. Code and output should try to respect the 80x25 size of a
		crt (remember when fixing stuff in the server room!)</P
><DIV
CLASS="SECTION"
><HR><H2
CLASS="SECTION"
><A
NAME="AEN174"
>Option Processing</A
></H2
><P
>For plugins written in C, we recommend the C standard
		getopt library for short options. If using getopt_long, check to
		be sure that HAVE_GETOPT_H is defined (configure checks this and
		sets the #define in common/config.h).</P
><P
>For plugins written in Perl, we recommend Getopt::Long module.</P
><P
>Positional arguments are strongly discouraged.</P
><P
>There are a few reserved options that should not be used
		for other purposes:</P
><P
CLASS="LITERALLAYOUT"
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-V&nbsp;version&nbsp;(--version)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-h&nbsp;help&nbsp;(--help)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-t&nbsp;timeout&nbsp;(--timeout)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-w&nbsp;warning&nbsp;threshold&nbsp;(--warning)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-c&nbsp;critical&nbsp;threshold&nbsp;(--critical)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-H&nbsp;hostname&nbsp;(--hostname)<br>
		</P
><P
>In addition to the reserved options above, some other standard options are:</P
><P
CLASS="LITERALLAYOUT"
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-C&nbsp;SNMP&nbsp;community&nbsp;(--community)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-a&nbsp;authentication&nbsp;password&nbsp;(--authentication)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-l&nbsp;login&nbsp;name&nbsp;(--logname)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-p&nbsp;port&nbsp;or&nbsp;password&nbsp;(--port&nbsp;or&nbsp;--passwd/--password)monitors&nbsp;operational<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-u&nbsp;url&nbsp;or&nbsp;username&nbsp;(--url&nbsp;or&nbsp;--username)<br>
		</P
><P
>Look at check_pgsql and check_procs to see how I currently
		think this can work.  Standard options are:</P
><P
>The option -V or --version should be present in all
		plugins. For C plugins it should result in a call to print_revision, a
		function in utils.c which takes two character arguments, the
		command name and the plugin revision.</P
><P
>The -? option, or any other unparsable set of options,
		should print out a short usage statement. Character width should
		be 80 and less and no more that 23 lines should be printed (it
		should display cleanly on a dumb terminal in a server
		room).</P
><P
>The option -h or --help should be present in all plugins.
		In C plugins, it should result in a call to print_help (or
		equivalent).  The function print_help should call print_revision, 
		then print_usage, then should provide detailed
		help. Help text should fit on an 80-character width display, but
		may run as many lines as needed.</P
></DIV
><DIV
CLASS="SECTION"
><HR><H2
CLASS="SECTION"
><A
NAME="AEN187"
>Plugins with more than one type of threshold, or with
      threshold ranges</A
></H2
><P
>Old style was to do things like -ct for critical time and
      -cv for critical value. That goes out the window with POSIX
      getopt. The allowable alternatves are:</P
><P
></P
><OL
TYPE="1"
><LI
><P
>long options like -critical-time (or -ct and -cv, I
	  suppose).</P
></LI
><LI
><P
>repeated options like `check_load -w 10 -w 6 -w 4 -c
	  16 -c 10 -c 10`</P
></LI
><LI
><P
>for brevity, the above can be expressed as `check_load
	  -w 10,6,4 -c 16,10,10`</P
></LI
><LI
><P
>ranges are expressed with colons as in `check_procs -C
	  httpd -w 1:20 -c 1:30` which will warn above 20 instances,
	  and critical at 0 and above 30</P
></LI
><LI
><P
>lists are expressed with commas, so Jacob's check_nmap
	  uses constructs like '-p 1000,1010,1050:1060,2000'</P
></LI
><LI
><P
>If possible when writing lists, use tokens to make the
	  list easy to remember and non-order dependent - so
	  check_disk uses '-c 10000,10%' so that it is clear which is
	  the precentage and which is the KB values (note that due to
	  my own lack of foresight, that used to be '-c 10000:10%' but
	  such constructs should all be changed for consistency,
	  though providing reverse compatibility is fairly
	  easy).</P
></LI
></OL
><P
>As always, comments are welcome - making this consistent
      without a host of long options was quite a hassle, and I would
      suspect that there are flaws in this strategy. Perhaps clear
      long-options is the most important of the above choices, but not
      all POSIX systems have C libraries for long options, so the
      short forms must exist as well.</P
></DIV
></DIV
><DIV
CLASS="SECTION"
><HR><H1
CLASS="SECTION"
><A
NAME="SUBMITTINGCHANGES"
>New submissions and patches</A
></H1
><P
>If you would like other to use your plugins and have it included in
	the standard distribution, please include patches for the relavant
	configuration files, in particular "configure.in" Otherwise submitted 
	plugins will be included in the contrib directory.</P
><P
>Plugins in the contrib directory are going to be migrated to the
	standard plugins/plugin-scripts directory as time permits and per user
	requests</P
><P
>Patches should be submitted via the SourceForge and be announced to
	the mailing list.</P
><P
>For new plugins, provide a diff to add to the EXTRAS list (configure.in) 
	unless you are fairly sure that the plugin will work for all platforms with 
	no non-standard	software added.</P
><P
>If possible please submit a test harness. Documentation on sample
	tests coming soon.</P
></DIV
></DIV
></DIV
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