d1b4f01898e5a8130871ef55387c86c5da112c35
1 /*****************************************************************************
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License as published by
5 the Free Software Foundation; either version 2 of the License, or
6 (at your option) any later version.
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
13 You should have received a copy of the GNU General Public License
14 along with this program; if not, write to the Free Software
15 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 $Id$
19 *****************************************************************************/
21 const char *progname = "check_users";
22 const char *revision = "$Revision$";
23 const char *copyright = "2000-2004";
24 const char *email = "nagiosplug-devel@lists.sourceforge.net";
26 #include "common.h"
27 #include "popen.h"
28 #include "utils.h"
30 #define possibly_set(a,b) ((a) == 0 ? (b) : 0)
32 int process_arguments (int, char **);
33 void print_help (void);
34 void print_usage (void);
36 int wusers = -1;
37 int cusers = -1;
39 int
40 main (int argc, char **argv)
41 {
42 int users = -1;
43 int result = STATE_UNKNOWN;
44 char input_buffer[MAX_INPUT_BUFFER];
45 char *perf;
47 setlocale (LC_ALL, "");
48 bindtextdomain (PACKAGE, LOCALEDIR);
49 textdomain (PACKAGE);
51 perf = strdup("");
53 if (process_arguments (argc, argv) == ERROR)
54 usage4 (_("Could not parse arguments"));
56 /* run the command */
57 child_process = spopen (WHO_COMMAND);
58 if (child_process == NULL) {
59 printf (_("Could not open pipe: %s\n"), WHO_COMMAND);
60 return STATE_UNKNOWN;
61 }
63 child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
64 if (child_stderr == NULL)
65 printf (_("Could not open stderr for %s\n"), WHO_COMMAND);
67 users = 0;
69 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
71 /* increment 'users' on all lines except total user count */
72 if (input_buffer[0] != '#') {
73 users++;
74 continue;
75 }
77 /* get total logged in users */
78 if (sscanf (input_buffer, _("# users=%d"), &users) == 1)
79 break;
81 }
83 /* check STDERR */
84 if (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
85 result = possibly_set (result, STATE_UNKNOWN);
86 (void) fclose (child_stderr);
88 /* close the pipe */
89 if (spclose (child_process))
90 result = possibly_set (result, STATE_UNKNOWN);
92 /* else check the user count against warning and critical thresholds */
93 if (users >= cusers)
94 result = STATE_CRITICAL;
95 else if (users >= wusers)
96 result = STATE_WARNING;
97 else if (users >= 0)
98 result = STATE_OK;
100 if (result == STATE_UNKNOWN)
101 printf (_("Unable to read output\n"));
102 else {
103 asprintf(&perf, "%s", perfdata ("users", users, "",
104 TRUE, wusers,
105 TRUE, cusers,
106 TRUE, 0,
107 FALSE, 0));
108 printf (_("USERS %s - %d users currently logged in |%s\n"), state_text (result),
109 users, perf);
110 }
112 return result;
113 }
117 /* process command-line arguments */
118 int
119 process_arguments (int argc, char **argv)
120 {
121 int c;
123 int option = 0;
124 static struct option longopts[] = {
125 {"critical", required_argument, 0, 'c'},
126 {"warning", required_argument, 0, 'w'},
127 {"version", no_argument, 0, 'V'},
128 {"help", no_argument, 0, 'h'},
129 {0, 0, 0, 0}
130 };
132 if (argc < 2)
133 usage ("\n");
135 while (1) {
136 c = getopt_long (argc, argv, "+hVvc:w:", longopts, &option);
138 if (c == -1 || c == EOF || c == 1)
139 break;
141 switch (c) {
142 case '?': /* print short usage statement if args not parsable */
143 printf (_("%s: Unknown argument: %s\n\n"), progname, optarg);
144 print_usage ();
145 exit (STATE_UNKNOWN);
146 case 'h': /* help */
147 print_help ();
148 exit (STATE_OK);
149 case 'V': /* version */
150 print_revision (progname, revision);
151 exit (STATE_OK);
152 case 'c': /* critical */
153 if (!is_intnonneg (optarg))
154 usage (_("Critical threshold must be a positive integer\n"));
155 else
156 cusers = atoi (optarg);
157 break;
158 case 'w': /* warning */
159 if (!is_intnonneg (optarg))
160 usage (_("Warning threshold must be a positive integer\n"));
161 else
162 wusers = atoi (optarg);
163 break;
164 }
165 }
167 c = optind;
168 if (wusers == -1 && argc > c) {
169 if (is_intnonneg (argv[c]) == FALSE)
170 usage (_("Warning threshold must be a positive integer\n"));
171 else
172 wusers = atoi (argv[c++]);
173 }
175 if (cusers == -1 && argc > c) {
176 if (is_intnonneg (argv[c]) == FALSE)
177 usage (_("Warning threshold must be a positive integer\n"));
178 else
179 cusers = atoi (argv[c]);
180 }
182 return OK;
183 }
187 void
188 print_help (void)
189 {
190 print_revision (progname, revision);
192 printf ("Copyright (c) 1999 Ethan Galstad\n");
193 printf (COPYRIGHT, copyright, email);
195 printf (_("\
196 This plugin checks the number of users currently logged in on the local\n\
197 system and generates an error if the number exceeds the thresholds specified.\n"));
199 print_usage ();
201 printf (_(UT_HELP_VRSN));
203 printf (_("\
204 -w, --warning=INTEGER\n\
205 Set WARNING status if more than INTEGER users are logged in\n\
206 -c, --critical=INTEGER\n\
207 Set CRITICAL status if more than INTEGER users are logged in\n"));
209 printf (_(UT_SUPPORT));
210 }
214 void
215 print_usage (void)
216 {
217 printf ("Usage: %s -w <users> -c <users>\n", progname);
218 }