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 #define possibly_set(a,b) ((a) == 0 ? (b) : 0)
30 int process_arguments (int, char **);
31 void print_help (void);
32 void print_usage (void);
34 int wusers = -1;
35 int cusers = -1;
37 int
38 main (int argc, char **argv)
39 {
40 int users = -1;
41 int result = STATE_OK;
42 char input_buffer[MAX_INPUT_BUFFER];
44 if (process_arguments (argc, argv) == ERROR)
45 usage (_("Could not parse arguments\n"));
47 /* run the command */
48 child_process = spopen (WHO_COMMAND);
49 if (child_process == NULL) {
50 printf (_("Could not open pipe: %s\n"), WHO_COMMAND);
51 return STATE_UNKNOWN;
52 }
54 child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
55 if (child_stderr == NULL)
56 printf (_("Could not open stderr for %s\n"), WHO_COMMAND);
58 users = 0;
60 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
62 /* increment 'users' on all lines except total user count */
63 if (input_buffer[0] != '#') {
64 users++;
65 continue;
66 }
68 /* get total logged in users */
69 if (sscanf (input_buffer, _("# users=%d"), &users) == 1)
70 break;
72 }
74 /* check STDERR */
75 if (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
76 result = possibly_set (result, STATE_UNKNOWN);
77 (void) fclose (child_stderr);
79 /* close the pipe */
80 if (spclose (child_process))
81 result = possibly_set (result, STATE_UNKNOWN);
83 /* else check the user count against warning and critical thresholds */
84 if (users >= cusers)
85 result = STATE_CRITICAL;
86 else if (users >= wusers)
87 result = STATE_WARNING;
88 else if (users >= 0)
89 result = STATE_OK;
91 if (result == STATE_UNKNOWN)
92 printf (_("Unable to read output\n"));
93 else
94 printf (_("USERS %s - %d users currently logged in\n"), state_text (result),
95 users);
97 return result;
98 }
104 /* process command-line arguments */
105 int
106 process_arguments (int argc, char **argv)
107 {
108 int c;
110 int option_index = 0;
111 static struct option long_options[] = {
112 {"critical", required_argument, 0, 'c'},
113 {"warning", required_argument, 0, 'w'},
114 {"version", no_argument, 0, 'V'},
115 {"help", no_argument, 0, 'h'},
116 {0, 0, 0, 0}
117 };
119 if (argc < 2)
120 usage ("\n");
122 while (1) {
123 c = getopt_long (argc, argv, "+hVvc:w:", long_options, &option_index);
125 if (c == -1 || c == EOF || c == 1)
126 break;
128 switch (c) {
129 case '?': /* print short usage statement if args not parsable */
130 printf (_("%s: Unknown argument: %s\n\n"), progname, optarg);
131 print_usage ();
132 exit (STATE_UNKNOWN);
133 case 'h': /* help */
134 print_help ();
135 exit (STATE_OK);
136 case 'V': /* version */
137 print_revision (progname, revision);
138 exit (STATE_OK);
139 case 'c': /* critical */
140 if (!is_intnonneg (optarg))
141 usage (_("Critical threshold must be a nonnegative integer\n"));
142 else
143 cusers = atoi (optarg);
144 break;
145 case 'w': /* warning */
146 if (!is_intnonneg (optarg))
147 usage (_("Warning threshold must be a nonnegative integer\n"));
148 else
149 wusers = atoi (optarg);
150 break;
151 }
152 }
154 c = optind;
155 if (wusers == -1 && argc > c) {
156 if (is_intnonneg (argv[c]) == FALSE)
157 usage (_("Warning threshold must be a nonnegative integer\n"));
158 else
159 wusers = atoi (argv[c++]);
160 }
162 if (cusers == -1 && argc > c) {
163 if (is_intnonneg (argv[c]) == FALSE)
164 usage (_("Warning threshold must be a nonnegative integer\n"));
165 else
166 cusers = atoi (argv[c]);
167 }
169 return OK;
170 }
176 \f
177 void
178 print_help (void)
179 {
180 print_revision (progname, revision);
182 printf (_("Copyright (c) 1999 Ethan Galstad\n"));
183 printf (_(COPYRIGHT), copyright, email);
185 printf (_("\
186 This plugin checks the number of users currently logged in on the local\n\
187 system and generates an error if the number exceeds the thresholds specified.\n"));
189 print_usage ();
191 printf (_(UT_HELP_VRSN));
193 printf (_("\
194 -w, --warning=INTEGER\n\
195 Set WARNING status if more than INTEGER users are logged in\n\
196 -c, --critical=INTEGER\n\
197 Set CRITICAL status if more than INTEGER users are logged in\n"));
199 printf (_(UT_SUPPORT));
200 }
205 void
206 print_usage (void)
207 {
208 printf ("Usage: %s -w <users> -c <users>\n", progname);
209 printf (_(UT_HLP_VRS), progname, progname);
210 }