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 *****************************************************************************/
19 const char *progname = "check_users";
20 const char *revision = "$Revision$";
21 const char *copyright = "2000-2003";
22 const char *email = "nagiosplug-devel@lists.sourceforge.net";
24 #include "common.h"
25 #include "popen.h"
26 #include "utils.h"
28 void
29 print_usage (void)
30 {
31 printf ("Usage: %s -w <users> -c <users>\n", progname);
32 printf (_(UT_HLP_VRS), progname, progname);
33 }
35 void
36 print_help (void)
37 {
38 print_revision (progname, revision);
40 printf (_("Copyright (c) 1999 Ethan Galstad\n"));
41 printf (_(COPYRIGHT), copyright, email);
43 printf (_("\
44 This plugin checks the number of users currently logged in on the local\n\
45 system and generates an error if the number exceeds the thresholds specified.\n"));
47 print_usage ();
49 printf (_(UT_HELP_VRSN));
51 printf (_("\
52 -w, --warning=INTEGER\n\
53 Set WARNING status if more than INTEGER users are logged in\n\
54 -c, --critical=INTEGER\n\
55 Set CRITICAL status if more than INTEGER users are logged in\n"));
57 printf (_(UT_SUPPORT));
58 }
59 \f
60 #define possibly_set(a,b) ((a) == 0 ? (b) : 0)
62 int process_arguments (int, char **);
63 void print_usage (void);
64 void print_help (void);
66 int wusers = -1;
67 int cusers = -1;
69 int
70 main (int argc, char **argv)
71 {
72 int users = -1;
73 int result = STATE_OK;
74 char input_buffer[MAX_INPUT_BUFFER];
76 if (process_arguments (argc, argv) == ERROR)
77 usage (_("Could not parse arguments\n"));
79 /* run the command */
80 child_process = spopen (WHO_COMMAND);
81 if (child_process == NULL) {
82 printf (_("Could not open pipe: %s\n"), WHO_COMMAND);
83 return STATE_UNKNOWN;
84 }
86 child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
87 if (child_stderr == NULL)
88 printf (_("Could not open stderr for %s\n"), WHO_COMMAND);
90 users = 0;
92 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
94 /* increment 'users' on all lines except total user count */
95 if (input_buffer[0] != '#') {
96 users++;
97 continue;
98 }
100 /* get total logged in users */
101 if (sscanf (input_buffer, _("# users=%d"), &users) == 1)
102 break;
104 }
106 /* check STDERR */
107 if (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
108 result = possibly_set (result, STATE_UNKNOWN);
109 (void) fclose (child_stderr);
111 /* close the pipe */
112 if (spclose (child_process))
113 result = possibly_set (result, STATE_UNKNOWN);
115 /* else check the user count against warning and critical thresholds */
116 if (users >= cusers)
117 result = STATE_CRITICAL;
118 else if (users >= wusers)
119 result = STATE_WARNING;
120 else if (users >= 0)
121 result = STATE_OK;
123 if (result == STATE_UNKNOWN)
124 printf (_("Unable to read output\n"));
125 else
126 printf (_("USERS %s - %d users currently logged in\n"), state_text (result),
127 users);
129 return result;
130 }
136 /* process command-line arguments */
137 int
138 process_arguments (int argc, char **argv)
139 {
140 int c;
142 int option_index = 0;
143 static struct option long_options[] = {
144 {"critical", required_argument, 0, 'c'},
145 {"warning", required_argument, 0, 'w'},
146 {"version", no_argument, 0, 'V'},
147 {"help", no_argument, 0, 'h'},
148 {0, 0, 0, 0}
149 };
151 if (argc < 2)
152 usage ("\n");
154 while (1) {
155 c = getopt_long (argc, argv, "+hVvc:w:", long_options, &option_index);
157 if (c == -1 || c == EOF || c == 1)
158 break;
160 switch (c) {
161 case '?': /* print short usage statement if args not parsable */
162 printf (_("%s: Unknown argument: %s\n\n"), progname, optarg);
163 print_usage ();
164 exit (STATE_UNKNOWN);
165 case 'h': /* help */
166 print_help ();
167 exit (STATE_OK);
168 case 'V': /* version */
169 print_revision (progname, revision);
170 exit (STATE_OK);
171 case 'c': /* critical */
172 if (!is_intnonneg (optarg))
173 usage (_("Critical threshold must be a nonnegative integer\n"));
174 cusers = atoi (optarg);
175 break;
176 case 'w': /* warning */
177 if (!is_intnonneg (optarg))
178 usage (_("Warning threshold must be a nonnegative integer\n"));
179 wusers = atoi (optarg);
180 break;
181 }
182 }
184 c = optind;
185 if (wusers == -1 && argc > c) {
186 if (is_intnonneg (argv[c]) == FALSE)
187 usage (_("Warning threshold must be a nonnegative integer\n"));
188 wusers = atoi (argv[c++]);
189 }
191 if (cusers == -1 && argc > c) {
192 if (is_intnonneg (argv[c]) == FALSE)
193 usage (_("Warning threshold must be a nonnegative integer\n"));
194 cusers = atoi (argv[c]);
195 }
197 return OK;
198 }