1 /******************************************************************************
2 *
3 * Nagios check_users plugin
4 *
5 * License: GPL
6 * Copyright (c) 2002-2006 nagios-plugins team
7 *
8 * Last Modified: $Date$
9 *
10 * Description:
11 *
12 * This file contains the check_users plugin
13 *
14 * License Information:
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 2 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, write to the Free Software
28 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 *
30 * $Id$
31 *
32 *****************************************************************************/
34 const char *progname = "check_users";
35 const char *revision = "$Revision$";
36 const char *copyright = "2000-2006";
37 const char *email = "nagiosplug-devel@lists.sourceforge.net";
39 #include "common.h"
40 #include "popen.h"
41 #include "utils.h"
43 #define possibly_set(a,b) ((a) == 0 ? (b) : 0)
45 int process_arguments (int, char **);
46 void print_help (void);
47 void print_usage (void);
49 int wusers = -1;
50 int cusers = -1;
52 int
53 main (int argc, char **argv)
54 {
55 int users = -1;
56 int result = STATE_UNKNOWN;
57 char input_buffer[MAX_INPUT_BUFFER];
58 char *perf;
60 setlocale (LC_ALL, "");
61 bindtextdomain (PACKAGE, LOCALEDIR);
62 textdomain (PACKAGE);
64 perf = strdup("");
66 if (process_arguments (argc, argv) == ERROR)
67 usage4 (_("Could not parse arguments"));
69 /* run the command */
70 child_process = spopen (WHO_COMMAND);
71 if (child_process == NULL) {
72 printf (_("Could not open pipe: %s\n"), WHO_COMMAND);
73 return STATE_UNKNOWN;
74 }
76 child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
77 if (child_stderr == NULL)
78 printf (_("Could not open stderr for %s\n"), WHO_COMMAND);
80 users = 0;
82 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
84 /* increment 'users' on all lines except total user count */
85 if (input_buffer[0] != '#') {
86 users++;
87 continue;
88 }
90 /* get total logged in users */
91 if (sscanf (input_buffer, _("# users=%d"), &users) == 1)
92 break;
94 }
96 /* check STDERR */
97 if (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
98 result = possibly_set (result, STATE_UNKNOWN);
99 (void) fclose (child_stderr);
101 /* close the pipe */
102 if (spclose (child_process))
103 result = possibly_set (result, STATE_UNKNOWN);
105 /* else check the user count against warning and critical thresholds */
106 if (users >= cusers)
107 result = STATE_CRITICAL;
108 else if (users >= wusers)
109 result = STATE_WARNING;
110 else if (users >= 0)
111 result = STATE_OK;
113 if (result == STATE_UNKNOWN)
114 printf ("%s\n", _("Unable to read output"));
115 else {
116 asprintf(&perf, "%s", perfdata ("users", users, "",
117 TRUE, wusers,
118 TRUE, cusers,
119 TRUE, 0,
120 FALSE, 0));
121 printf (_("USERS %s - %d users currently logged in |%s\n"), state_text (result),
122 users, perf);
123 }
125 return result;
126 }
130 /* process command-line arguments */
131 int
132 process_arguments (int argc, char **argv)
133 {
134 int c;
136 int option = 0;
137 static struct option longopts[] = {
138 {"critical", required_argument, 0, 'c'},
139 {"warning", required_argument, 0, 'w'},
140 {"version", no_argument, 0, 'V'},
141 {"help", no_argument, 0, 'h'},
142 {0, 0, 0, 0}
143 };
145 if (argc < 2)
146 usage ("\n");
148 while (1) {
149 c = getopt_long (argc, argv, "+hVvc:w:", longopts, &option);
151 if (c == -1 || c == EOF || c == 1)
152 break;
154 switch (c) {
155 case '?': /* print short usage statement if args not parsable */
156 usage2 (_("Unknown argument"), optarg);
157 case 'h': /* help */
158 print_help ();
159 exit (STATE_OK);
160 case 'V': /* version */
161 print_revision (progname, revision);
162 exit (STATE_OK);
163 case 'c': /* critical */
164 if (!is_intnonneg (optarg))
165 usage4 (_("Critical threshold must be a positive integer"));
166 else
167 cusers = atoi (optarg);
168 break;
169 case 'w': /* warning */
170 if (!is_intnonneg (optarg))
171 usage4 (_("Warning threshold must be a positive integer"));
172 else
173 wusers = atoi (optarg);
174 break;
175 }
176 }
178 c = optind;
179 if (wusers == -1 && argc > c) {
180 if (is_intnonneg (argv[c]) == FALSE)
181 usage4 (_("Warning threshold must be a positive integer"));
182 else
183 wusers = atoi (argv[c++]);
184 }
186 if (cusers == -1 && argc > c) {
187 if (is_intnonneg (argv[c]) == FALSE)
188 usage4 (_("Warning threshold must be a positive integer"));
189 else
190 cusers = atoi (argv[c]);
191 }
193 return OK;
194 }
198 void
199 print_help (void)
200 {
201 print_revision (progname, revision);
203 printf ("Copyright (c) 1999 Ethan Galstad\n");
204 printf (COPYRIGHT, copyright, email);
206 printf ("%s\n", _("This plugin checks the number of users currently logged in on the local"));
207 printf ("%s\n", _("system and generates an error if the number exceeds the thresholds specified."));
209 printf ("\n\n");
211 print_usage ();
213 printf (_(UT_HELP_VRSN));
215 printf (" %s\n", "-w, --warning=INTEGER");
216 printf (" %s\n", _("Set WARNING status if more than INTEGER users are logged in"));
217 printf (" %s\n", "-c, --critical=INTEGER");
218 printf (" %s\n", _("Set CRITICAL status if more than INTEGER users are logged in"));
220 printf (_(UT_SUPPORT));
221 }
224 void
225 print_usage (void)
226 {
227 printf (_("Usage:"));
228 printf ("%s -w <users> -c <users>\n", progname);
229 }