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negate.c

/******************************************************************************
*
* Nagios negate plugin
*
* License: GPL
* Copyright (c) 2002-2006 nagios-plugins team
*
* Last Modified: $Date: 2006/10/19 23:53:28 $
*
* Description:
*
* This file contains the negate plugin
*
*  Negates the status of a plugin (returns OK for CRITICAL, and vice-versa)
*
* License Information:
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: negate.c,v 1.26 2006/10/19 23:53:28 opensides Exp $

@@-<article>

<sect1>
<title>Quick Reference</title>
<refentry>
<refmeta><manvolnum>5<manvolnum></refmeta>
<refnamdiv>
<refname>&progname;</refname>
<refpurpose>&SUMMARY;</refpurpose>
</refnamdiv>
</refentry>
</sect1>

<sect1>
<title>FAQ</title>
</sect1>

<sect1>
<title>Theory, Installation, and Operation</title>

<sect2>
<title>General Description</title>
<para>
&DESCRIPTION;
</para>
</sect2>

<sect2>
<title>Future Enhancements</title>
<para>ToDo List</para>
<itemizedlist>
<listitem>Add option to do regex substitution in output text</listitem>
</itemizedlist>
</sect2>-@@

******************************************************************************/

const char *progname = "negate";
const char *revision = "$Revision: 1.26 $";
const char *copyright = "2002-2006";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

#define DEFAULT_TIMEOUT 9

#include "common.h"
#include "utils.h"
#include "popen.h"

char *command_line;

int process_arguments (int, char **);
int validate_arguments (void);
void print_help (void);
void print_usage (void);



int
main (int argc, char **argv)
{
      int found = 0, result = STATE_UNKNOWN;
      char *buf;

      setlocale (LC_ALL, "");
      bindtextdomain (PACKAGE, LOCALEDIR);
      textdomain (PACKAGE);

      if (process_arguments (argc, argv) == ERROR)
            usage4 (_("Could not parse arguments"));

      /* Set signal handling and alarm */
      if (signal (SIGALRM, timeout_alarm_handler) == SIG_ERR)
            die (STATE_UNKNOWN, _("Cannot catch SIGALRM"));

      (void) alarm ((unsigned) timeout_interval);

      child_process = spopen (command_line);
      if (child_process == NULL)
            die (STATE_UNKNOWN, _("Could not open pipe: %s\n"), command_line);

      child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
      
      if (child_stderr == NULL) {
            printf (_("Could not open stderr for %s\n"), command_line);
      }

      buf = malloc(MAX_INPUT_BUFFER);
      while (fgets (buf, MAX_INPUT_BUFFER - 1, child_process)) {
            found++;
            printf ("%s", buf);
      }

      if (!found)
            die (STATE_UNKNOWN,
                 _("%s problem - No data received from host\nCMD: %s\n"),\
                 argv[0], command_line);

      /* close the pipe */
      result = spclose (child_process);

      /* WARNING if output found on stderr */
      if (fgets (buf, MAX_INPUT_BUFFER - 1, child_stderr))
            result = max_state (result, STATE_WARNING);

      /* close stderr */
      (void) fclose (child_stderr);

      if (result == STATE_OK)
            exit (STATE_CRITICAL);
      else if (result == STATE_CRITICAL)
            exit (EXIT_SUCCESS);
      else
            exit (result);
}

/******************************************************************************
@@-
<sect2>
<title>Functions</title>

<sect3>
<title>process_arguments</title>

<para>This function parses the command line into the needed
variables.</para>

<para>Aside from the standard 'help' and 'version' options, there
is a only a 'timeout' option.</para>

</sect3>
-@@
******************************************************************************/



/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
      int c;

      int option = 0;
      static struct option longopts[] = {
            {"help", no_argument, 0, 'h'},
            {"version", no_argument, 0, 'V'},
            {"timeout", required_argument, 0, 't'},
            {0, 0, 0, 0}
      };

      while (1) {
            c = getopt_long (argc, argv, "+hVt:",
                             longopts, &option);

            if (c == -1 || c == EOF)
                  break;

            switch (c) {
            case '?':     /* help */
                  usage2 (_("Unknown argument"), optarg);
                  break;
            case 'h':     /* help */
                  print_help ();
                  exit (EXIT_SUCCESS);
                  break;
            case 'V':     /* version */
                  print_revision (progname, revision);
                  exit (EXIT_SUCCESS);
            case 't':     /* timeout period */
                  if (!is_integer (optarg))
                        usage2 (_("Timeout interval must be a positive integer"), optarg);
                  else
                        timeout_interval = atoi (optarg);
                  break;
            }
      }

      asprintf (&command_line, "%s", argv[optind]);
      for (c = optind+1; c < argc; c++) {
            asprintf (&command_line, "%s %s", command_line, argv[c]);
      }

      return validate_arguments ();
}


/******************************************************************************
@@-
<sect3>
<title>validate_arguments</title>

<para>No validation is currently done.</para>

</sect3>
-@@
******************************************************************************/



int
validate_arguments ()
{
      if (command_line == NULL)
            return ERROR;
      return STATE_OK;
}

/******************************************************************************
@@-
</sect2> 
</sect1>
</article>
-@@
******************************************************************************/



void
print_help (void)
{
      print_revision (progname, revision);

      printf (COPYRIGHT, copyright, email);

      printf ("%s\n", _("Negates the status of a plugin (returns OK for CRITICAL, and vice-versa)."));

  printf ("\n\n");

      print_usage ();

      printf (_(UT_HELP_VRSN));

      printf (_(UT_TIMEOUT), DEFAULT_TIMEOUT);

      printf ("    %s\n", _("[keep timeout than the plugin timeout to retain CRITICAL status]"));
  printf ("\n");
  printf ("%s\n", _("Examples:"));
      printf (" %s\n", "negate \"/usr/local/nagios/libexec/check_ping -H host\"");
  printf ("    %s\n", _("Run check_ping and invert result. Must use full path to plugin"));
  printf (" %s\n", "negate \"/usr/local/nagios/libexec/check_procs -a 'vi negate.c'\"");
  printf ("    %s\n", _("Use single quotes if you need to retain spaces"));
  printf (_(UT_VERBOSE));
  printf ("\n");
  printf ("%s\n", _("Notes:"));
      printf ("%s\n", _("This plugin is a wrapper to take the output of another plugin and invert it."));
  printf ("%s\n", _("If the wrapped plugin returns STATE_OK, the wrapper will return STATE_CRITICAL."));
  printf ("%s\n", _("If the wrapped plugin returns STATE_CRITICAL, the wrapper will return STATE_OK."));
  printf ("%s\n", _("Otherwise, the output state of the wrapped plugin is unchanged."));

      printf (_(UT_SUPPORT));
}



void
print_usage (void)
{
  printf (_("Usage:"));
      printf ("%s [-t timeout] <definition of wrapped plugin>\n",progname);
}

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