plugins/negate.c

   1 /*****************************************************************************
   2 *
   3 * Nagios negate plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 2002-2008 Nagios Plugins Development Team
   7 *
   8 * Description:
   9 *
  10 * This file contains the negate plugin
  11 *
  12 * Negates the status of a plugin (returns OK for CRITICAL, and vice-versa).
  13 * Can also perform custom state switching.
  14 *
  15 *
  16 * This program is free software: you can redistribute it and/or modify
  17 * it under the terms of the GNU General Public License as published by
  18 * the Free Software Foundation, either version 3 of the License, or
  19 * (at your option) any later version.
  20 *
  21 * This program is distributed in the hope that it will be useful,
  22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 * GNU General Public License for more details.
  25 *
  26 * You should have received a copy of the GNU General Public License
  27 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  28 *
  29 *
  30 *****************************************************************************/
  31
  32 const char *progname = "negate";
  33 const char *copyright = "2002-2008";
  34 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  35
  36 #define DEFAULT_TIMEOUT 11
  37
  38 #include "common.h"
  39 #include "utils.h"
  40 #include "utils_cmd.h"
  41
  42 /* char *command_line; */
  43
  44 static const char **process_arguments (int, char **);
  45 int validate_arguments (char **);
  46 void print_help (void);
  47 void print_usage (void);
  48 int subst_text = FALSE;
  49
  50 static int state[4] = {
  51         STATE_OK,
  52         STATE_WARNING,
  53         STATE_CRITICAL,
  54         STATE_UNKNOWN,
  55 };
  56
  57 int
  58 main (int argc, char **argv)
  59 {
  60         int found = 0, result = STATE_UNKNOWN;
  61         char *buf, *sub;
  62         char **command_line;
  63         output chld_out, chld_err;
  64         int i;
  65
  66         setlocale (LC_ALL, "");
  67         bindtextdomain (PACKAGE, LOCALEDIR);
  68         textdomain (PACKAGE);
  69
  70         timeout_interval = DEFAULT_TIMEOUT;
  71
  72         command_line = (char **) process_arguments (argc, argv);
  73
  74         /* Set signal handling and alarm */
  75         if (signal (SIGALRM, timeout_alarm_handler) == SIG_ERR)
  76                 die (STATE_UNKNOWN, _("Cannot catch SIGALRM"));
  77
  78         (void) alarm ((unsigned) timeout_interval);
  79
  80         /* catch when the command is quoted */
  81         if(command_line[1] == NULL) {
  82                 result = cmd_run (command_line[0], &chld_out, &chld_err, 0);
  83         } else {
  84                 result = cmd_run_array (command_line, &chld_out, &chld_err, 0);
  85         }
  86         if (chld_err.lines > 0) {
  87                 printf ("Error output from command:\n");
  88                 for (i = 0; i < chld_err.lines; i++) {
  89                         printf ("%s\n", chld_err.line[i]);
  90                 }
  91                 exit (STATE_WARNING);
  92         }
  93
  94         /* Return UNKNOWN or worse if no output is returned */
  95         if (chld_out.lines == 0)
  96                 die (max_state_alt (result, STATE_UNKNOWN), _("No data returned from command\n"));
  97
  98         for (i = 0; i < chld_out.lines; i++) {
  99                 if (subst_text && result != state[result] &&
 100                     result >= 0 && result <= 4) {
 101                         /* Loop over each match found */
 102                         while ((sub = strstr (chld_out.line[i], state_text (result)))) {
 103                                 /* Terminate the first part and skip over the string we'll substitute */
 104                                 *sub = '\0';
 105                                 sub += strlen (state_text (result));
 106                                 /* then put everything back together */
 107                                 asprintf (&chld_out.line[i], "%s%s%s", chld_out.line[i], state_text (state[result]), sub);
 108                         }
 109                 }
 110                 printf ("%s\n", chld_out.line[i]);
 111         }
 112
 113         if (result >= 0 && result <= 4) {
 114                 exit (state[result]);
 115         } else {
 116                 exit (result);
 117         }
 118 }
 119
 120
 121 /* process command-line arguments */
 122 static const char **
 123 process_arguments (int argc, char **argv)
 124 {
 125         int c;
 126         int permute = TRUE;
 127
 128         int option = 0;
 129         static struct option longopts[] = {
 130                 {"help", no_argument, 0, 'h'},
 131                 {"version", no_argument, 0, 'V'},
 132                 {"timeout", required_argument, 0, 't'},
 133                 {"timeout-result", required_argument, 0, 'T'},
 134                 {"ok", required_argument, 0, 'o'},
 135                 {"warning", required_argument, 0, 'w'},
 136                 {"critical", required_argument, 0, 'c'},
 137                 {"unknown", required_argument, 0, 'u'},
 138                 {"substitute", no_argument, 0, 's'},
 139                 {0, 0, 0, 0}
 140         };
 141
 142         while (1) {
 143                 c = getopt_long (argc, argv, "+hVt:T:o:w:c:u:s", longopts, &option);
 144
 145                 if (c == -1 || c == EOF)
 146                         break;
 147
 148                 switch (c) {
 149                 case '?':     /* help */
 150                         usage5 ();
 151                         break;
 152                 case 'h':     /* help */
 153                         print_help ();
 154                         exit (EXIT_SUCCESS);
 155                         break;
 156                 case 'V':     /* version */
 157                         print_revision (progname, NP_VERSION);
 158                         exit (EXIT_SUCCESS);
 159                 case 't':     /* timeout period */
 160                         if (!is_integer (optarg))
 161                                 usage2 (_("Timeout interval must be a positive integer"), optarg);
 162                         else
 163                                 timeout_interval = atoi (optarg);
 164                         break;
 165                 case 'T':     /* Result to return on timeouts */
 166                         if ((timeout_state = translate_state(optarg)) == ERROR)
 167                                 usage4 (_("Timeout result must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
 168                         break;
 169                 case 'o':     /* replacement for OK */
 170                         if ((state[STATE_OK] = translate_state(optarg)) == ERROR)
 171                                 usage4 (_("Ok must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
 172                         permute = FALSE;
 173                         break;
 174
 175                 case 'w':     /* replacement for WARNING */
 176                         if ((state[STATE_WARNING] = translate_state(optarg)) == ERROR)
 177                                 usage4 (_("Warning must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
 178                         permute = FALSE;
 179                         break;
 180                 case 'c':     /* replacement for CRITICAL */
 181                         if ((state[STATE_CRITICAL] = translate_state(optarg)) == ERROR)
 182                                 usage4 (_("Critical must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
 183                         permute = FALSE;
 184                         break;
 185                 case 'u':     /* replacement for UNKNOWN */
 186                         if ((state[STATE_UNKNOWN] = translate_state(optarg)) == ERROR)
 187                                 usage4 (_("Unknown must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
 188                         permute = FALSE;
 189                         break;
 190                 case 's':     /* Substitute status text */
 191                         subst_text = TRUE;
 192                         break;
 193                 }
 194         }
 195
 196         validate_arguments (&argv[optind]);
 197
 198         if (permute) { /* No [owcu] switch specified, default to this */
 199                 state[STATE_OK] = STATE_CRITICAL;
 200                 state[STATE_CRITICAL] = STATE_OK;
 201         }
 202
 203         return (const char **) &argv[optind];
 204 }
 205
 206
 207 int
 208 validate_arguments (char **command_line)
 209 {
 210         if (command_line[0] == NULL)
 211                 usage4 (_("Could not parse arguments"));
 212
 213         if (strncmp(command_line[0],"/",1) != 0 && strncmp(command_line[0],"./",2) != 0)
 214                 usage4 (_("Require path to command"));
 215 }
 216
 217
 218 int
 219 translate_state (char *state_text)
 220 {
 221         char *temp_ptr;
 222         for (temp_ptr = state_text; *temp_ptr; temp_ptr++) {
 223                 *temp_ptr = toupper(*temp_ptr);
 224         }
 225         if (!strcmp(state_text,"OK") || !strcmp(state_text,"0"))
 226                 return STATE_OK;
 227         if (!strcmp(state_text,"WARNING") || !strcmp(state_text,"1"))
 228                 return STATE_WARNING;
 229         if (!strcmp(state_text,"CRITICAL") || !strcmp(state_text,"2"))
 230                 return STATE_CRITICAL;
 231         if (!strcmp(state_text,"UNKNOWN") || !strcmp(state_text,"3"))
 232                 return STATE_UNKNOWN;
 233         return ERROR;
 234 }
 235
 236 void
 237 print_help (void)
 238 {
 239         print_revision (progname, NP_VERSION);
 240
 241         printf (COPYRIGHT, copyright, email);
 242
 243         printf ("%s\n", _("Negates the status of a plugin (returns OK for CRITICAL and vice-versa)."));
 244         printf ("%s\n", _("Additional switches can be used to control which state becomes what."));
 245
 246         printf ("\n\n");
 247
 248         print_usage ();
 249
 250         printf (UT_HELP_VRSN);
 251
 252         printf (UT_TIMEOUT, timeout_interval);
 253         printf ("    %s\n", _("Keep timeout longer than the plugin timeout to retain CRITICAL status."));
 254         printf (" -T, --timeout-result=STATUS\n");
 255         printf ("    %s\n", _("Custom result on Negate timeouts; see below for STATUS definition\n"));
 256
 257         printf(" -o, --ok=STATUS\n");
 258         printf(" -w, --warning=STATUS\n");
 259         printf(" -c, --critical=STATUS\n");
 260         printf(" -u, --unknown=STATUS\n");
 261         printf(_("    STATUS can be 'OK', 'WARNING', 'CRITICAL' or 'UNKNOWN' without single\n"));
 262         printf(_("    quotes. Numeric values are accepted. If nothing is specified, permutes\n"));
 263         printf(_("    OK and CRITICAL.\n"));
 264         printf(" -s, --substitute\n");
 265         printf(_("    Substitute output text as well. Will only substitute text in CAPITALS\n"));
 266
 267         printf ("\n");
 268         printf ("%s\n", _("Examples:"));
 269         printf (" %s\n", "negate /usr/local/nagios/libexec/check_ping -H host");
 270         printf ("    %s\n", _("Run check_ping and invert result. Must use full path to plugin"));
 271         printf (" %s\n", "negate -w OK -c UNKNOWN /usr/local/nagios/libexec/check_procs -a 'vi negate.c'");
 272         printf ("    %s\n", _("This will return OK instead of WARNING and UNKNOWN instead of CRITICAL"));
 273         printf ("\n");
 274         printf ("%s\n", _("Notes:"));
 275         printf (" %s\n", _("This plugin is a wrapper to take the output of another plugin and invert it."));
 276         printf (" %s\n", _("The full path of the plugin must be provided."));
 277         printf (" %s\n", _("If the wrapped plugin returns OK, the wrapper will return CRITICAL."));
 278         printf (" %s\n", _("If the wrapped plugin returns CRITICAL, the wrapper will return OK."));
 279         printf (" %s\n", _("Otherwise, the output state of the wrapped plugin is unchanged."));
 280         printf ("\n");
 281         printf (" %s\n", _("Using timeout-result, it is possible to override the timeout behaviour or a"));
 282         printf (" %s\n", _("plugin by setting the negate timeout a bit lower."));
 283
 284         printf (UT_SUPPORT);
 285 }
 286
 287
 288
 289 void
 290 print_usage (void)
 291 {
 292         printf ("%s\n", _("Usage:"));
 293         printf ("%s [-t timeout] [-Towcu STATE] [-s] <definition of wrapped plugin>\n", progname);
 294 }