plugins/check_nagios.c

   1 /*****************************************************************************
   2 *
   3 * Nagios check_nagios plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 1999-2007 Nagios Plugins Development Team
   7 *
   8 * Description:
   9 *
  10 * This file contains the check_nagios plugin
  11 *
  12 * This plugin checks the status of the Nagios process on the local machine.
  13 * The plugin will check to make sure the Nagios status log is no older than
  14 * the number of minutes specified by the expires option.
  15 * It also checks the process table for a process matching the command
  16 * argument.
  17 *
  18 *
  19 * This program is free software: you can redistribute it and/or modify
  20 * it under the terms of the GNU General Public License as published by
  21 * the Free Software Foundation, either version 3 of the License, or
  22 * (at your option) any later version.
  23 *
  24 * This program is distributed in the hope that it will be useful,
  25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27 * GNU General Public License for more details.
  28 *
  29 * You should have received a copy of the GNU General Public License
  30 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  31 *
  32 *
  33 *****************************************************************************/
  34
  35 const char *progname = "check_nagios";
  36 const char *copyright = "1999-2007";
  37 const char *email = "devel@nagios-plugins.org";
  38
  39 #include "common.h"
  40 #include "runcmd.h"
  41 #include "utils.h"
  42
  43 int process_arguments (int, char **);
  44 void print_help (void);
  45 void print_usage (void);
  46
  47 char *status_log = NULL;
  48 char *process_string = NULL;
  49 int expire_minutes = 0;
  50
  51 int verbose = 0;
  52
  53 int
  54 main (int argc, char **argv)
  55 {
  56         int result = STATE_UNKNOWN;
  57         char input_buffer[MAX_INPUT_BUFFER];
  58         unsigned long latest_entry_time = 0L;
  59         unsigned long temp_entry_time = 0L;
  60         int proc_entries = 0;
  61         time_t current_time;
  62         char *temp_ptr;
  63         FILE *fp;
  64         int procuid = 0;
  65         int procpid = 0;
  66         int procppid = 0;
  67         int procvsz = 0;
  68         int procrss = 0;
  69         float procpcpu = 0;
  70         char procstat[8];
  71 #ifdef PS_USES_PROCETIME
  72         char procetime[MAX_INPUT_BUFFER];
  73 #endif /* PS_USES_PROCETIME */
  74         char procprog[MAX_INPUT_BUFFER];
  75         char *procargs;
  76         int pos, cols;
  77         int expected_cols = PS_COLS - 1;
  78         const char *zombie = "Z";
  79         char *temp_string;
  80         output chld_out, chld_err;
  81         size_t i;
  82
  83         setlocale (LC_ALL, "");
  84         bindtextdomain (PACKAGE, LOCALEDIR);
  85         textdomain (PACKAGE);
  86
  87         /* Parse extra opts if any */
  88         argv=np_extra_opts (&argc, argv, progname);
  89
  90         if (process_arguments (argc, argv) == ERROR)
  91                 usage_va(_("Could not parse arguments"));
  92
  93         /* Set signal handling and alarm timeout */
  94         if (signal (SIGALRM, timeout_alarm_handler) == SIG_ERR) {
  95                 usage_va(_("Cannot catch SIGALRM"));
  96         }
  97
  98         /* handle timeouts gracefully... */
  99         alarm (timeout_interval);
 100
 101         /* open the status log */
 102         fp = fopen (status_log, "r");
 103         if (fp == NULL) {
 104                 die (STATE_CRITICAL, "NAGIOS %s: %s\n", _("CRITICAL"), _("Cannot open status log for reading!"));
 105         }
 106
 107         /* get the date/time of the last item updated in the log */
 108         while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, fp)) {
 109                 if ((temp_ptr = strstr (input_buffer, "created=")) != NULL) {
 110                         temp_entry_time = strtoul (temp_ptr + 8, NULL, 10);
 111                         latest_entry_time = temp_entry_time;
 112                         break;
 113                 } else if ((temp_ptr = strtok (input_buffer, "]")) != NULL) {
 114                         temp_entry_time = strtoul (temp_ptr + 1, NULL, 10);
 115                         if (temp_entry_time > latest_entry_time)
 116                                 latest_entry_time = temp_entry_time;
 117                 }
 118         }
 119         fclose (fp);
 120
 121         if (verbose >= 2)
 122                 printf("command: %s\n", PS_COMMAND);
 123
 124         /* run the command to check for the Nagios process.. */
 125         if((result = np_runcmd(PS_COMMAND, &chld_out, &chld_err, 0)) != 0)
 126                 result = STATE_WARNING;
 127
 128         /* count the number of matching Nagios processes... */
 129         for(i = 0; i < chld_out.lines; i++) {
 130                 cols = sscanf (chld_out.line[i], PS_FORMAT, PS_VARLIST);
 131                 /* Zombie processes do not give a procprog command */
 132                 if ( cols == (expected_cols - 1) && strstr(procstat, zombie) ) {
 133                         cols = expected_cols;
 134                         /* Set some value for procargs for the strip command further below
 135                          * Seen to be a problem on some Solaris 7 and 8 systems */
 136                         chld_out.line[i][pos] = '\n';
 137                         chld_out.line[i][pos+1] = 0x0;
 138                 }
 139                 if ( cols >= expected_cols ) {
 140                         xasprintf (&procargs, "%s", chld_out.line[i] + pos);
 141                         strip (procargs);
 142
 143                         /* Some ps return full pathname for command. This removes path */
 144                         temp_string = strtok ((char *)procprog, "/");
 145                         while (temp_string) {
 146                                 strcpy(procprog, temp_string);
 147                                 temp_string = strtok (NULL, "/");
 148                         }
 149
 150                         /* May get empty procargs */
 151                         if (!strstr(procargs, argv[0]) && strstr(procargs, process_string) && strcmp(procargs,"")) {
 152                                 proc_entries++;
 153                                 if (verbose >= 2) {
 154                                         printf (_("Found process: %s %s\n"), procprog, procargs);
 155                                 }
 156                         }
 157                 }
 158         }
 159
 160         /* If we get anything on stderr, at least set warning */
 161         if(chld_err.buflen)
 162                 result = max_state (result, STATE_WARNING);
 163
 164         /* reset the alarm handler */
 165         alarm (0);
 166
 167         if (proc_entries == 0) {
 168                 die (STATE_CRITICAL, "NAGIOS %s: %s\n", _("CRITICAL"), _("Could not locate a running Nagios process!"));
 169         }
 170
 171         if (latest_entry_time == 0L) {
 172                 die (STATE_CRITICAL, "NAGIOS %s: %s\n", _("CRITICAL"), _("Cannot parse Nagios log file for valid time"));
 173         }
 174
 175         time (&current_time);
 176         if ((int)(current_time - latest_entry_time) > (expire_minutes * 60)) {
 177                 result = STATE_WARNING;
 178         } else {
 179                 result = STATE_OK;
 180         }
 181
 182         printf ("NAGIOS %s: ", (result == STATE_OK) ? _("OK") : _("WARNING"));
 183         printf (ngettext ("%d process", "%d processes", proc_entries), proc_entries);
 184         printf (", ");
 185         printf (
 186           ngettext ("status log updated %d second ago",
 187             "status log updated %d seconds ago",
 188             (int) (current_time - latest_entry_time) ),
 189             (int) (current_time - latest_entry_time) );
 190         printf ("\n");
 191
 192         return result;
 193 }
 194
 195
 196
 197 /* process command-line arguments */
 198 int
 199 process_arguments (int argc, char **argv)
 200 {
 201         int c;
 202
 203         int option = 0;
 204         static struct option longopts[] = {
 205                 {"filename", required_argument, 0, 'F'},
 206                 {"expires", required_argument, 0, 'e'},
 207                 {"command", required_argument, 0, 'C'},
 208                 {"timeout", optional_argument, 0, 't'},
 209                 {"version", no_argument, 0, 'V'},
 210                 {"help", no_argument, 0, 'h'},
 211                 {"verbose", no_argument, 0, 'v'},
 212                 {0, 0, 0, 0}
 213         };
 214
 215         if (argc < 2)
 216                 return ERROR;
 217
 218         if (!is_option (argv[1])) {
 219                 status_log = argv[1];
 220                 if (is_intnonneg (argv[2]))
 221                         expire_minutes = atoi (argv[2]);
 222                 else
 223                         die (STATE_UNKNOWN,
 224                                                                  _("Expiration time must be an integer (seconds)\n"));
 225                 process_string = argv[3];
 226                 return OK;
 227         }
 228
 229         while (1) {
 230                 c = getopt_long (argc, argv, "+hVvF:C:e:t:", longopts, &option);
 231
 232                 if (c == -1 || c == EOF || c == 1)
 233                         break;
 234
 235                 switch (c) {
 236                 case 'h':                                                                       /* help */
 237                         print_help ();
 238                         exit (STATE_OK);
 239                 case 'V':                                                                       /* version */
 240                         print_revision (progname, NP_VERSION);
 241                         exit (STATE_OK);
 242                 case 'F':                                                                       /* status log */
 243                         status_log = optarg;
 244                         break;
 245                 case 'C':                                                                       /* command */
 246                         process_string = optarg;
 247                         break;
 248                 case 'e':                                                                       /* expiry time */
 249                         if (is_intnonneg (optarg))
 250                                 expire_minutes = atoi (optarg);
 251                         else
 252                                 die (STATE_UNKNOWN,
 253                                      _("Expiration time must be an integer (seconds)\n"));
 254                         break;
 255                 case 't':                                                                       /* timeout */
 256                         if (is_intnonneg (optarg))
 257                                 timeout_interval = atoi (optarg);
 258                         else
 259                                 die (STATE_UNKNOWN,
 260                                      _("Timeout must be an integer (seconds)\n"));
 261                         break;
 262                 case 'v':
 263                         verbose++;
 264                         break;
 265                 default:                                                                        /* print short usage_va statement if args not parsable */
 266                         usage5();
 267                 }
 268         }
 269
 270
 271         if (status_log == NULL)
 272                 die (STATE_UNKNOWN, _("You must provide the status_log\n"));
 273
 274         if (process_string == NULL)
 275                 die (STATE_UNKNOWN, _("You must provide a process string\n"));
 276
 277         return OK;
 278 }
 279
 280
 281
 282 void
 283 print_help (void)
 284 {
 285         print_revision (progname, NP_VERSION);
 286
 287         printf (_(COPYRIGHT), copyright, email);
 288
 289         printf ("%s\n", _("This plugin checks the status of the Nagios process on the local machine"));
 290   printf ("%s\n", _("The plugin will check to make sure the Nagios status log is no older than"));
 291   printf ("%s\n", _("the number of minutes specified by the expires option."));
 292   printf ("%s\n", _("It also checks the process table for a process matching the command argument."));
 293
 294   printf ("\n\n");
 295
 296         print_usage ();
 297
 298         printf (UT_HELP_VRSN);
 299         printf (UT_EXTRA_OPTS);
 300
 301         printf (" %s\n", "-F, --filename=FILE");
 302   printf ("    %s\n", _("Name of the log file to check"));
 303   printf (" %s\n", "-e, --expires=INTEGER");
 304   printf ("    %s\n", _("Minutes aging after which logfile is considered stale"));
 305   printf (" %s\n", "-C, --command=STRING");
 306   printf ("    %s\n", _("Substring to search for in process arguments"));
 307   printf (" %s\n", "-t, --timeout=INTEGER");
 308   printf ("    %s\n", _("Timeout for the plugin in seconds"));
 309   printf (UT_VERBOSE);
 310
 311   printf ("\n");
 312   printf ("%s\n", _("Examples:"));
 313   printf (" %s\n", "check_nagios -t 20 -e 5 -F /usr/local/nagios/var/status.log -C /usr/local/nagios/bin/nagios");
 314
 315   printf (UT_SUPPORT);
 316 }
 317
 318
 319
 320 void
 321 print_usage (void)
 322 {
 323   printf ("%s\n", _("Usage:"));
 324         printf ("%s -F <status log file> -t <timeout_seconds> -e <expire_minutes> -C <process_string>\n", progname);
 325 }