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authorEthan Galstad <egalstad@users.sourceforge.net>2002-02-28 06:42:51 (GMT)
committerEthan Galstad <egalstad@users.sourceforge.net>2002-02-28 06:42:51 (GMT)
commit44a321cb8a42d6c0ea2d96a1086a17f2134c89cc (patch)
treea1a4d9f7b92412a17ab08f34f04eec45433048b7 /plugins/check_users.c
parent54fd5d7022ff2d6a59bc52b8869182f3fc77a058 (diff)
downloadmonitoring-plugins-44a321cb8a42d6c0ea2d96a1086a17f2134c89cc.tar.gz
Initial revision
git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@2 f882894a-f735-0410-b71e-b25c423dba1c
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1/******************************************************************************
2 *
3 * CHECK_USERS.C
4 *
5 * Program: Current users plugin for Nagios
6 * License: GPL
7 * Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)
8 *
9 * Last Modified: $Date$
10 * Modifications:
11 *
12 * 1999-11-17 Karl DeBisschop
13 * - check stderr and status from spoen/spclose
14 * - reformat commenst to fit 80-cahr screen
15 * - set default result to STATE_UNKNOWN
16 * - initialize users at -1, eliminate 'found' variable
17 *
18 * Command line: CHECK_USERS <wusers> <cusers>
19 *
20 * Description:
21 *
22 * This plugin will use the /usr/bin/who command to check the number
23 * of users currently logged into the system. If number of logged in
24 * user exceeds the number specified by the <cusers> option, a
25 * STATE_CRITICAL is return. It it exceeds <wusers>, a STATE_WARNING
26 * is returned. Errors reading the output from the who command result
27 * in a STATE_UNKNOWN error.
28 *
29 * License Information:
30 *
31 * This program is free software; you can redistribute it and/or modify
32 * it under the terms of the GNU General Public License as published by
33 * the Free Software Foundation; either version 2 of the License, or
34 * (at your option) any later version.
35 *
36 * This program is distributed in the hope that it will be useful,
37 * but WITHOUT ANY WARRANTY; without even the implied warranty of
38 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
39 * GNU General Public License for more details.
40 *
41 * You should have received a copy of the GNU General Public License
42 * along with this program; if not, write to the Free Software
43 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
44 *
45 *****************************************************************************/
46
47#include "common.h"
48#include "popen.h"
49#include "utils.h"
50
51#define PROGNAME "check_users"
52
53#define possibly_set(a,b) ((a) == 0 ? (b) : 0)
54
55int process_arguments (int, char **);
56int call_getopt (int, char **);
57void print_usage (void);
58void print_help (void);
59
60int wusers = -1;
61int cusers = -1;
62
63int
64main (int argc, char **argv)
65{
66 int users = -1;
67 int result = STATE_OK;
68 char input_buffer[MAX_INPUT_BUFFER];
69
70 if (process_arguments (argc, argv) == ERROR)
71 usage ("Could not parse arguments\n");
72
73 /* run the command */
74 child_process = spopen (WHO_COMMAND);
75 if (child_process == NULL) {
76 printf ("Could not open pipe: %s\n", WHO_COMMAND);
77 return STATE_UNKNOWN;
78 }
79
80 child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
81 if (child_stderr == NULL)
82 printf ("Could not open stderr for %s\n", WHO_COMMAND);
83
84 users = 0;
85
86 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
87
88 /* increment 'users' on all lines except total user count */
89 if (input_buffer[0] != '#') {
90 users++;
91 continue;
92 }
93
94 /* get total logged in users */
95 if (sscanf (input_buffer, "# users=%d", &users) == 1)
96 break;
97
98 }
99
100 /* check STDERR */
101 if (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
102 result = possibly_set (result, STATE_UNKNOWN);
103 (void) fclose (child_stderr);
104
105 /* close the pipe */
106 if (spclose (child_process))
107 result = possibly_set (result, STATE_UNKNOWN);
108
109 /* else check the user count against warning and critical thresholds */
110 if (users >= cusers)
111 result = STATE_CRITICAL;
112 else if (users >= wusers)
113 result = STATE_WARNING;
114 else if (users >= 0)
115 result = STATE_OK;
116
117 if (result == STATE_UNKNOWN)
118 printf ("Unable to read output\n");
119 else
120 printf ("USERS %s - %d users currently logged in\n", state_text (result),
121 users);
122
123 return result;
124}
125
126
127
128
129
130/* process command-line arguments */
131int
132process_arguments (int argc, char **argv)
133{
134 int c;
135
136 if (argc < 2)
137 usage ("\n");
138
139 c = 0;
140 while ((c += call_getopt (argc - c, &argv[c])) < argc) {
141
142 if (is_option (argv[c]))
143 continue;
144
145 if (wusers == -1 && argc > c) {
146 if (is_intnonneg (argv[c]) == FALSE)
147 usage ("Warning threshold must be a nonnegative integer\n");
148 wusers = atoi (argv[c]);
149
150 }
151 else if (cusers == -1 && argc > c) {
152 if (is_intnonneg (argv[c]) == FALSE)
153 usage ("Warning threshold must be a nonnegative integer\n");
154 cusers = atoi (argv[c]);
155 }
156 }
157
158 return OK;
159}
160
161
162
163
164
165int
166call_getopt (int argc, char **argv)
167{
168 int c, i = 0;
169
170#ifdef HAVE_GETOPT_H
171 int option_index = 0;
172 static struct option long_options[] = {
173 {"critical", required_argument, 0, 'c'},
174 {"warning", required_argument, 0, 'w'},
175 {"version", no_argument, 0, 'V'},
176 {"help", no_argument, 0, 'h'},
177 {0, 0, 0, 0}
178 };
179#endif
180
181 while (1) {
182#ifdef HAVE_GETOPT_H
183 c = getopt_long (argc, argv, "+hVvc:w:", long_options, &option_index);
184#else
185 c = getopt (argc, argv, "+hVvc:w:");
186#endif
187
188 i++;
189
190 if (c == -1 || c == EOF || c == 1)
191 break;
192
193 switch (c) {
194 case 'c':
195 case 'w':
196 i++;
197 }
198
199 switch (c) {
200 case '?': /* print short usage statement if args not parsable */
201 printf ("%s: Unknown argument: %s\n\n", my_basename (argv[0]), optarg);
202 print_usage ();
203 exit (STATE_UNKNOWN);
204 case 'h': /* help */
205 print_help ();
206 exit (STATE_OK);
207 case 'V': /* version */
208 print_revision (my_basename (argv[0]), "$Revision$");
209 exit (STATE_OK);
210 case 'c': /* critical */
211 if (!is_intnonneg (optarg))
212 usage ("Critical threshold must be a nonnegative integer\n");
213 cusers = atoi (optarg);
214 break;
215 case 'w': /* warning */
216 if (!is_intnonneg (optarg))
217 usage ("Warning threshold must be a nonnegative integer\n");
218 wusers = atoi (optarg);
219 break;
220 }
221 }
222 return i;
223}
224
225
226
227
228
229void
230print_usage (void)
231{
232 printf ("Usage: %s -w <users> -c <users>\n", PROGNAME);
233}
234
235
236
237
238
239void
240print_help (void)
241{
242 print_revision (PROGNAME, "$Revision$");
243 printf
244 ("Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)\n\n"
245 "This plugin checks the number of users currently logged in on the local\n"
246 "system and generates an error if the number exceeds the thresholds specified.\n");
247 print_usage ();
248 printf
249 ("Options:\n"
250 " -w, --warning=INTEGER\n"
251 " Set WARNING status if more than INTEGER users are logged in\n"
252 " -c, --critical=INTEGER\n"
253 " Set CRITICAL status if more than INTEGER users are logged in\n"
254 " -h, --help\n"
255 " Print detailed help screen\n"
256 " -V, --version\n" " Print version information\n");
257}