1 /******************************************************************************
2 *
3 * CHECK_NAGIOS.C
4 *
5 * Program: Nagios process plugin for Nagios
6 * License: GPL
7 * Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)
8 *
9 * $Id$
10 *
11 * License Information:
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 *
27 *****************************************************************************/
29 #include "common.h"
30 #include "popen.h"
31 #include "utils.h"
33 const char *progname = "check_nagios";
35 int process_arguments (int, char **);
36 void print_usage (void);
37 void print_help (void);
39 char *status_log = NULL;
40 char *process_string = NULL;
41 int expire_minutes = 0;
43 int
44 main (int argc, char **argv)
45 {
46 int result = STATE_UNKNOWN;
47 char input_buffer[MAX_INPUT_BUFFER];
48 unsigned long latest_entry_time = 0L;
49 unsigned long temp_entry_time = 0L;
50 int proc_entries = 0;
51 time_t current_time;
52 char *temp_ptr;
53 FILE *fp;
55 if (process_arguments (argc, argv) == ERROR)
56 usage ("Could not parse arguments\n");
58 /* Set signal handling and alarm */
59 if (signal (SIGALRM, timeout_alarm_handler) == SIG_ERR) {
60 printf ("Cannot catch SIGALRM");
61 return STATE_UNKNOWN;
62 }
64 /* handle timeouts gracefully... */
65 alarm (timeout_interval);
67 /* open the status log */
68 fp = fopen (status_log, "r");
69 if (fp == NULL) {
70 printf ("Error: Cannot open status log for reading!\n");
71 return STATE_CRITICAL;
72 }
74 /* get the date/time of the last item updated in the log */
75 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, fp)) {
76 temp_ptr = strtok (input_buffer, "]");
77 temp_entry_time =
78 (temp_ptr == NULL) ? 0L : strtoul (temp_ptr + 1, NULL, 10);
79 if (temp_entry_time > latest_entry_time)
80 latest_entry_time = temp_entry_time;
81 }
82 fclose (fp);
84 /* run the command to check for the Nagios process.. */
85 child_process = spopen (PS_RAW_COMMAND);
86 if (child_process == NULL) {
87 printf ("Could not open pipe: %s\n", PS_RAW_COMMAND);
88 return STATE_UNKNOWN;
89 }
91 child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
92 if (child_stderr == NULL) {
93 printf ("Could not open stderr for %s\n", PS_RAW_COMMAND);
94 }
96 /* count the number of matching Nagios processes... */
97 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
98 if (!strstr(input_buffer, argv[0]) && strstr(input_buffer, process_string))
99 proc_entries++;
100 }
102 /* If we get anything on stderr, at least set warning */
103 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
104 result = max_state (result, STATE_WARNING);
106 /* close stderr */
107 (void) fclose (child_stderr);
109 /* close the pipe */
110 if (spclose (child_process))
111 result = max_state (result, STATE_WARNING);
113 /* reset the alarm handler */
114 alarm (0);
116 if (proc_entries == 0) {
117 printf ("Could not locate a running Nagios process!\n");
118 return STATE_CRITICAL;
119 }
121 result = STATE_OK;
123 time (¤t_time);
124 if ((current_time - latest_entry_time) > (expire_minutes * 60))
125 result = STATE_WARNING;
127 printf
128 ("Nagios %s: located %d process%s, status log updated %d second%s ago\n",
129 (result == STATE_OK) ? "ok" : "problem", proc_entries,
130 (proc_entries == 1) ? "" : "es",
131 (int) (current_time - latest_entry_time),
132 ((int) (current_time - latest_entry_time) == 1) ? "" : "s");
134 return result;
135 }
141 /* process command-line arguments */
142 int
143 process_arguments (int argc, char **argv)
144 {
145 int c;
147 #ifdef HAVE_GETOPT_H
148 int option_index = 0;
149 static struct option long_options[] = {
150 {"filename", required_argument, 0, 'F'},
151 {"expires", required_argument, 0, 'e'},
152 {"command", required_argument, 0, 'C'},
153 {"version", no_argument, 0, 'V'},
154 {"help", no_argument, 0, 'h'},
155 {0, 0, 0, 0}
156 };
157 #endif
159 if (argc < 2)
160 return ERROR;
162 if (!is_option (argv[1])) {
163 status_log = argv[1];
164 if (is_intnonneg (argv[2]))
165 expire_minutes = atoi (argv[2]);
166 else
167 terminate (STATE_UNKNOWN,
168 "Expiration time must be an integer (seconds)\nType '%s -h' for additional help\n",
169 progname);
170 process_string = argv[3];
171 return OK;
172 }
174 while (1) {
175 #ifdef HAVE_GETOPT_H
176 c = getopt_long (argc, argv, "+hVF:C:e:", long_options, &option_index);
177 #else
178 c = getopt (argc, argv, "+hVF:C:e:");
179 #endif
181 if (c == -1 || c == EOF || c == 1)
182 break;
184 switch (c) {
185 case '?': /* print short usage statement if args not parsable */
186 printf ("%s: Unknown argument: %c\n\n", progname, optopt);
187 print_usage ();
188 exit (STATE_UNKNOWN);
189 case 'h': /* help */
190 print_help ();
191 exit (STATE_OK);
192 case 'V': /* version */
193 print_revision (progname, "$Revision$");
194 exit (STATE_OK);
195 case 'F': /* hostname */
196 status_log = optarg;
197 break;
198 case 'C': /* hostname */
199 process_string = optarg;
200 break;
201 case 'e': /* hostname */
202 if (is_intnonneg (optarg))
203 expire_minutes = atoi (optarg);
204 else
205 terminate (STATE_UNKNOWN,
206 "Expiration time must be an integer (seconds)\nType '%s -h' for additional help\n",
207 progname);
208 break;
209 }
210 }
213 if (status_log == NULL)
214 terminate (STATE_UNKNOWN,
215 "You must provide the status_log\nType '%s -h' for additional help\n",
216 progname);
217 else if (process_string == NULL)
218 terminate (STATE_UNKNOWN,
219 "You must provide a process string\nType '%s -h' for additional help\n",
220 progname);
222 return OK;
223 }
229 void
230 print_usage (void)
231 {
232 printf
233 ("Usage: %s -F <status log file> -e <expire_minutes> -C <process_string>\n",
234 progname);
235 }
241 void
242 print_help (void)
243 {
244 print_revision (progname, "$Revision$");
245 printf
246 ("Copyright (c) 2000 Ethan Galstad/Karl DeBisschop\n\n"
247 "This plugin attempts to check the status of the Nagios process on the local\n"
248 "machine. The plugin will check to make sure the Nagios status log is no older\n"
249 "than the number of minutes specified by the <expire_minutes> option. It also\n"
250 "uses the /bin/ps command to check for a process matching whatever you specify\n"
251 "by the <process_string> argument.\n");
252 print_usage ();
253 printf
254 ("\nOptions:\n"
255 "-F, --filename=FILE\n"
256 " Name of the log file to check\n"
257 "-e, --expires=INTEGER\n"
258 " Seconds aging afterwhich logfile is condsidered stale\n"
259 "-C, --command=STRING\n"
260 " Command to search for in process table\n"
261 "-h, --help\n"
262 " Print this help screen\n"
263 "-V, --version\n"
264 " Print version information\n\n"
265 "Example:\n"
266 " ./check_nagios -F /usr/local/nagios/var/status.log -e 5 -C /usr/local/nagios/bin/nagios\n");
267 }