plugins/negate.c

   1 /******************************************************************************
   2 *
   3 * Nagios negate plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 2002-2007 nagios-plugins team
   7 *
   8 * Last Modified: $Date$
   9 *
  10 * Description:
  11 *
  12 * This file contains the negate plugin
  13 *
  14 *  Negates the status of a plugin (returns OK for CRITICAL, and vice-versa)
  15 *
  16 * License Information:
  17 *
  18 * This program is free software; you can redistribute it and/or modify
  19 * it under the terms of the GNU General Public License as published by
  20 * the Free Software Foundation; either version 2 of the License, or
  21 * (at your option) any later version.
  22 *
  23 * This program is distributed in the hope that it will be useful,
  24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26 * GNU General Public License for more details.
  27 *
  28 * You should have received a copy of the GNU General Public License
  29 * along with this program; if not, write to the Free Software
  30 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  31 *
  32 * $Id$
  33
  34 @@-<article>
  35
  36 <sect1>
  37 <title>Quick Reference</title>
  38 <refentry>
  39 <refmeta><manvolnum>5<manvolnum></refmeta>
  40 <refnamdiv>
  41 <refname>&progname;</refname>
  42 <refpurpose>&SUMMARY;</refpurpose>
  43 </refnamdiv>
  44 </refentry>
  45 </sect1>
  46
  47 <sect1>
  48 <title>FAQ</title>
  49 </sect1>
  50
  51 <sect1>
  52 <title>Theory, Installation, and Operation</title>
  53
  54 <sect2>
  55 <title>General Description</title>
  56 <para>
  57 &DESCRIPTION;
  58 </para>
  59 </sect2>
  60
  61 <sect2>
  62 <title>Future Enhancements</title>
  63 <para>ToDo List</para>
  64 <itemizedlist>
  65 <listitem>Add option to do regex substitution in output text</listitem>
  66 </itemizedlist>
  67 </sect2>-@@
  68
  69 ******************************************************************************/
  70
  71 const char *progname = "negate";
  72 const char *revision = "$Revision$";
  73 const char *copyright = "2002-2007";
  74 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  75
  76 #define DEFAULT_TIMEOUT 9
  77
  78 #include "common.h"
  79 #include "utils.h"
  80 #include "utils_cmd.h"
  81
  82 /* char *command_line; */
  83
  84 static const char **process_arguments (int, char **);
  85 int validate_arguments (char **);
  86 void print_help (void);
  87 void print_usage (void);
  88
  89 static int state[4] = {
  90         STATE_OK,
  91         STATE_WARNING,
  92         STATE_CRITICAL,
  93         STATE_UNKNOWN,
  94 };
  95
  96 int
  97 main (int argc, char **argv)
  98 {
  99         int found = 0, result = STATE_UNKNOWN;
 100         char *buf;
 101         char **command_line;
 102         output chld_out, chld_err;
 103         int i;
 104
 105         setlocale (LC_ALL, "");
 106         bindtextdomain (PACKAGE, LOCALEDIR);
 107         textdomain (PACKAGE);
 108
 109         command_line = (char **) process_arguments (argc, argv);
 110
 111         /* Set signal handling and alarm */
 112         if (signal (SIGALRM, timeout_alarm_handler) == SIG_ERR)
 113                 die (STATE_UNKNOWN, _("Cannot catch SIGALRM"));
 114
 115         (void) alarm ((unsigned) timeout_interval);
 116
 117         /* catch when the command is quoted */
 118         if(command_line[1] == NULL) {
 119                 result = cmd_run (command_line[0], &chld_out, &chld_err, 0);
 120         } else {
 121                 result = cmd_run_array (command_line, &chld_out, &chld_err, 0);
 122         }
 123         if (chld_err.lines > 0) {
 124                 printf ("Error output from command:\n");
 125                 for (i = 0; i < chld_err.lines; i++) {
 126                         printf ("%s\n", chld_err.line[i]);
 127                 }
 128                 exit (STATE_WARNING);
 129         }
 130
 131         if (chld_out.lines == 0)
 132                 die (STATE_UNKNOWN, _("No data returned from command\n"));
 133
 134         for (i = 0; i < chld_out.lines; i++) {
 135                 printf ("%s\n", chld_out.line[i]);
 136         }
 137
 138         if (result >= 0 && result <= 4) {
 139                 exit (state[result]);
 140         } else {
 141                 exit (result);
 142         }
 143 }
 144
 145 /******************************************************************************
 146 @@-
 147 <sect2>
 148 <title>Functions</title>
 149
 150 <sect3>
 151 <title>process_arguments</title>
 152
 153 <para>This function parses the command line into the needed
 154 variables.</para>
 155
 156 <para>Aside from the standard 'help' and 'version' options, there
 157 is a only a 'timeout' option.</para>
 158
 159 </sect3>
 160 -@@
 161 ******************************************************************************/
 162
 163
 164
 165 /* process command-line arguments */
 166 static const char **
 167 process_arguments (int argc, char **argv)
 168 {
 169         int c;
 170         int permute = TRUE;
 171
 172         int option = 0;
 173         static struct option longopts[] = {
 174                 {"help", no_argument, 0, 'h'},
 175                 {"version", no_argument, 0, 'V'},
 176                 {"timeout", required_argument, 0, 't'},
 177                 {"ok", required_argument, 0, 'o'},
 178                 {"warning", required_argument, 0, 'w'},
 179                 {"critical", required_argument, 0, 'c'},
 180                 {"unknown", required_argument, 0, 'u'},
 181                 {0, 0, 0, 0}
 182         };
 183
 184         while (1) {
 185                 c = getopt_long (argc, argv, "+hVt:o:w:c:u:", longopts, &option);
 186
 187                 if (c == -1 || c == EOF)
 188                         break;
 189
 190                 switch (c) {
 191                 case '?':     /* help */
 192                         usage5 ();
 193                         break;
 194                 case 'h':     /* help */
 195                         print_help ();
 196                         exit (EXIT_SUCCESS);
 197                         break;
 198                 case 'V':     /* version */
 199                         print_revision (progname, revision);
 200                         exit (EXIT_SUCCESS);
 201                 case 't':     /* timeout period */
 202                         if (!is_integer (optarg))
 203                                 usage2 (_("Timeout interval must be a positive integer"), optarg);
 204                         else
 205                                 timeout_interval = atoi (optarg);
 206                         break;
 207                 case 'o':     /* replacement for OK */
 208                         if ((state[STATE_OK] = translate_state(optarg)) == ERROR)
 209                                 usage4 (_("Ok must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
 210                         permute = FALSE;
 211                         break;
 212
 213                 case 'w':     /* replacement for WARNING */
 214                         if ((state[STATE_WARNING] = translate_state(optarg)) == ERROR)
 215                                 usage4 (_("Warning must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
 216                         permute = FALSE;
 217                         break;
 218                 case 'c':     /* replacement for CRITICAL */
 219                         if ((state[STATE_CRITICAL] = translate_state(optarg)) == ERROR)
 220                                 usage4 (_("Critical must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
 221                         permute = FALSE;
 222                         break;
 223                 case 'u':     /* replacement for UNKNOWN */
 224                         if ((state[STATE_UNKNOWN] = translate_state(optarg)) == ERROR)
 225                                 usage4 (_("Unknown must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
 226                         permute = FALSE;
 227                         break;
 228                 }
 229         }
 230
 231         validate_arguments (&argv[optind]);
 232
 233         if (permute) { /* No [owcu] switch specified, default to this */
 234                 state[STATE_OK] = STATE_CRITICAL;
 235                 state[STATE_CRITICAL] = STATE_OK;
 236         }
 237
 238         return (const char **) &argv[optind];
 239 }
 240
 241
 242 /******************************************************************************
 243 @@-
 244 <sect3>
 245 <title>validate_arguments</title>
 246
 247 <para>No validation is currently done.</para>
 248
 249 </sect3>
 250 -@@
 251 ******************************************************************************/
 252
 253
 254
 255 int
 256 validate_arguments (char **command_line)
 257 {
 258         if (command_line[0] == NULL)
 259                 usage4 (_("Could not parse arguments"));
 260
 261         if (strncmp(command_line[0],"/",1) != 0 && strncmp(command_line[0],"./",2) != 0)
 262                 usage4 (_("Require path to command"));
 263 }
 264
 265 /******************************************************************************
 266 @@-
 267 </sect2>
 268 </sect1>
 269 </article>
 270 -@@
 271 ******************************************************************************/
 272
 273 int
 274 translate_state (char *state_text)
 275 {
 276         char *temp_ptr;
 277         for (temp_ptr = state_text; *temp_ptr; temp_ptr++) {
 278                 *temp_ptr = toupper(*temp_ptr);
 279         }
 280         if (!strcmp(state_text,"OK") || !strcmp(state_text,"0"))
 281                 return STATE_OK;
 282         if (!strcmp(state_text,"WARNING") || !strcmp(state_text,"1"))
 283                 return STATE_WARNING;
 284         if (!strcmp(state_text,"CRITICAL") || !strcmp(state_text,"2"))
 285                 return STATE_CRITICAL;
 286         if (!strcmp(state_text,"UNKNOWN") || !strcmp(state_text,"3"))
 287                 return STATE_UNKNOWN;
 288         return ERROR;
 289 }
 290
 291 void
 292 print_help (void)
 293 {
 294         print_revision (progname, revision);
 295
 296         printf (COPYRIGHT, copyright, email);
 297
 298         printf ("%s\n", _("Negates the status of a plugin (returns OK for CRITICAL and vice-versa)."));
 299         printf ("%s\n", _("Additional switches can be used to control which state becomes what."));
 300
 301         printf ("\n\n");
 302
 303         print_usage ();
 304
 305         printf (_(UT_HELP_VRSN));
 306
 307         printf (_(UT_TIMEOUT), DEFAULT_TIMEOUT);
 308         printf ("    %s\n", _("Keep timeout longer than the plugin timeout to retain CRITICAL status."));
 309
 310         printf(" -o,--ok=STATUS\n");
 311         printf(" -w,--warning=STATUS\n");
 312         printf(" -c,--critical=STATUS\n");
 313         printf(" -u,--unknown=STATUS\n");
 314         printf(_("    STATUS can be 'OK', 'WARNING', 'CRITICAL' or 'UNKNOWN' without single\n"));
 315         printf(_("    quotes. Numeric values are accepted. If nothing is specified, permutes\n"));
 316         printf(_("    OK and CRITICAL.\n"));
 317
 318         printf ("\n");
 319         printf ("%s\n", _("Examples:"));
 320         printf (" %s\n", "negate /usr/local/nagios/libexec/check_ping -H host");
 321         printf ("    %s\n", _("Run check_ping and invert result. Must use full path to plugin"));
 322         printf (" %s\n", "negate -w OK -c UNKNOWN /usr/local/nagios/libexec/check_procs -a 'vi negate.c'");
 323         printf ("    %s\n", _("This will return OK instead of WARNING and UNKNOWN instead of CRITICAL"));
 324         printf ("\n");
 325         printf ("%s\n", _("Notes:"));
 326         printf ("%s\n", _("This plugin is a wrapper to take the output of another plugin and invert it."));
 327         printf ("%s\n", _("The full path of the plugin must be provided."));
 328         printf ("%s\n", _("If the wrapped plugin returns OK, the wrapper will return CRITICAL."));
 329         printf ("%s\n", _("If the wrapped plugin returns CRITICAL, the wrapper will return OK."));
 330         printf ("%s\n", _("Otherwise, the output state of the wrapped plugin is unchanged."));
 331
 332         printf (_(UT_SUPPORT));
 333 }
 334
 335
 336
 337 void
 338 print_usage (void)
 339 {
 340         printf (_("Usage:"));
 341         printf ("%s [-t timeout] [-owcu STATE] <definition of wrapped plugin>\n", progname);
 342 }