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negate.c

/*****************************************************************************
* 
* Nagios negate plugin
* 
* License: GPL
* Copyright (c) 2002-2008 Nagios Plugins Development Team
* 
* Last Modified: $Date: 2008-05-02 10:28:15 +0100 (Fri, 02 May 2008) $
* 
* Description:
* 
* This file contains the negate plugin
* 
* Negates the status of a plugin (returns OK for CRITICAL, and vice-versa).
* Can also perform custom state switching.
* 
* 
* 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 3 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, see <http://www.gnu.org/licenses/>.
* 
* $Id: negate.c 1989 2008-05-02 09:28:15Z dermoth $
* 
*****************************************************************************/

const char *progname = "negate";
const char *revision = "$Revision: 1989 $";
const char *copyright = "2002-2008";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

#define DEFAULT_TIMEOUT 11

#include "common.h"
#include "utils.h"
#include "utils_cmd.h"

/* char *command_line; */

static const char **process_arguments (int, char **);
int validate_arguments (char **);
void print_help (void);
void print_usage (void);
int subst_text = FALSE;

static int state[4] = {
      STATE_OK,
      STATE_WARNING,
      STATE_CRITICAL,
      STATE_UNKNOWN,
};

int
main (int argc, char **argv)
{
      int found = 0, result = STATE_UNKNOWN;
      char *buf, *sub;
      char **command_line;
      output chld_out, chld_err;
      int i;

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

      command_line = (char **) process_arguments (argc, argv);

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

      (void) alarm ((unsigned) timeout_interval);

      /* catch when the command is quoted */
      if(command_line[1] == NULL) {
            result = cmd_run (command_line[0], &chld_out, &chld_err, 0);
      } else {
            result = cmd_run_array (command_line, &chld_out, &chld_err, 0);
      }
      if (chld_err.lines > 0) {
            printf ("Error output from command:\n");
            for (i = 0; i < chld_err.lines; i++) {
                  printf ("%s\n", chld_err.line[i]);
            }
            exit (STATE_WARNING);
      }

      /* Return UNKNOWN or worse if no output is returned */
      if (chld_out.lines == 0)
            die (max_state_alt (result, STATE_UNKNOWN), _("No data returned from command\n"));

      for (i = 0; i < chld_out.lines; i++) {
            if (subst_text && result != state[result] &&
                result >= 0 && result <= 4) {
                  /* Loop over each match found */
                  while ((sub = strstr (chld_out.line[i], state_text (result)))) {
                        /* Terminate the first part and skip over the string we'll substitute */
                        *sub = '\0';
                        sub += strlen (state_text (result));
                        /* then put everything back together */
                        asprintf (&chld_out.line[i], "%s%s%s", chld_out.line[i], state_text (state[result]), sub);
                  }
            }
            printf ("%s\n", chld_out.line[i]);
      }

      if (result >= 0 && result <= 4) {
            exit (state[result]);
      } else {
            exit (result);
      }
}


/* process command-line arguments */
static const char **
process_arguments (int argc, char **argv)
{
      int c;
      int permute = TRUE;

      int option = 0;
      static struct option longopts[] = {
            {"help", no_argument, 0, 'h'},
            {"version", no_argument, 0, 'V'},
            {"timeout", required_argument, 0, 't'},
            {"ok", required_argument, 0, 'o'},
            {"warning", required_argument, 0, 'w'},
            {"critical", required_argument, 0, 'c'},
            {"unknown", required_argument, 0, 'u'},
            {"substitute", no_argument, 0, 's'},
            {0, 0, 0, 0}
      };

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

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

            switch (c) {
            case '?':     /* help */
                  usage5 ();
                  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;
            case 'o':     /* replacement for OK */
                  if ((state[STATE_OK] = translate_state(optarg)) == ERROR)
                        usage4 (_("Ok must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
                  permute = FALSE;
                  break;

            case 'w':     /* replacement for WARNING */
                  if ((state[STATE_WARNING] = translate_state(optarg)) == ERROR)
                        usage4 (_("Warning must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
                  permute = FALSE;
                  break;
            case 'c':     /* replacement for CRITICAL */
                  if ((state[STATE_CRITICAL] = translate_state(optarg)) == ERROR)
                        usage4 (_("Critical must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
                  permute = FALSE;
                  break;
            case 'u':     /* replacement for UNKNOWN */
                  if ((state[STATE_UNKNOWN] = translate_state(optarg)) == ERROR)
                        usage4 (_("Unknown must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
                  permute = FALSE;
                  break;
            case 's':     /* Substitute status text */
                  subst_text = TRUE;
                  break;
            }
      }

      validate_arguments (&argv[optind]);

      if (permute) { /* No [owcu] switch specified, default to this */
            state[STATE_OK] = STATE_CRITICAL;
            state[STATE_CRITICAL] = STATE_OK;
      }

      return (const char **) &argv[optind];
}


int
validate_arguments (char **command_line)
{
      if (command_line[0] == NULL)
            usage4 (_("Could not parse arguments"));

      if (strncmp(command_line[0],"/",1) != 0 && strncmp(command_line[0],"./",2) != 0)
            usage4 (_("Require path to command"));
}


int
translate_state (char *state_text)
{
      char *temp_ptr;
      for (temp_ptr = state_text; *temp_ptr; temp_ptr++) {
            *temp_ptr = toupper(*temp_ptr);
      }
      if (!strcmp(state_text,"OK") || !strcmp(state_text,"0"))
            return STATE_OK;
      if (!strcmp(state_text,"WARNING") || !strcmp(state_text,"1"))
            return STATE_WARNING;
      if (!strcmp(state_text,"CRITICAL") || !strcmp(state_text,"2"))
            return STATE_CRITICAL;
      if (!strcmp(state_text,"UNKNOWN") || !strcmp(state_text,"3"))
            return STATE_UNKNOWN;
      return ERROR;
}

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 ("%s\n", _("Additional switches can be used to control which state becomes what."));

      printf ("\n\n");

      print_usage ();

      printf (_(UT_HELP_VRSN));

      printf (_(UT_TIMEOUT), DEFAULT_TIMEOUT);
      printf ("    %s\n", _("Keep timeout longer than the plugin timeout to retain CRITICAL status."));

      printf(" -o, --ok=STATUS\n");
      printf(" -w, --warning=STATUS\n");
      printf(" -c, --critical=STATUS\n");
      printf(" -u, --unknown=STATUS\n");
      printf(_("    STATUS can be 'OK', 'WARNING', 'CRITICAL' or 'UNKNOWN' without single\n"));
      printf(_("    quotes. Numeric values are accepted. If nothing is specified, permutes\n"));
      printf(_("    OK and CRITICAL.\n"));
      printf(" -s, --substitute\n");
      printf(_("    Substitute output text as well. Will only substitute text in CAPITALS\n"));

      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 -w OK -c UNKNOWN /usr/local/nagios/libexec/check_procs -a 'vi negate.c'");
      printf ("    %s\n", _("This will return OK instead of WARNING and UNKNOWN instead of CRITICAL"));
      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", _("The full path of the plugin must be provided."));
      printf (" %s\n", _("If the wrapped plugin returns OK, the wrapper will return CRITICAL."));
      printf (" %s\n", _("If the wrapped plugin returns CRITICAL, the wrapper will return 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] [-owcu STATE] [-s] <definition of wrapped plugin>\n", progname);
}

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