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 setlocale (LC_ALL, "");
45 bindtextdomain (PACKAGE, LOCALEDIR);
46 textdomain (PACKAGE);
48 if (process_arguments (argc, argv) == ERROR)
49 usage (_("Could not parse arguments\n"));
51 /* run the command */
52 child_process = spopen (WHO_COMMAND);
53 if (child_process == NULL) {
54 printf (_("Could not open pipe: %s\n"), WHO_COMMAND);
55 return STATE_UNKNOWN;
56 }
58 child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
59 if (child_stderr == NULL)
60 printf (_("Could not open stderr for %s\n"), WHO_COMMAND);
62 users = 0;
64 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
66 /* increment 'users' on all lines except total user count */
67 if (input_buffer[0] != '#') {
68 users++;
69 continue;
70 }
72 /* get total logged in users */
73 if (sscanf (input_buffer, _("# users=%d"), &users) == 1)
74 break;
76 }
78 /* check STDERR */
79 if (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
80 result = possibly_set (result, STATE_UNKNOWN);
81 (void) fclose (child_stderr);
83 /* close the pipe */
84 if (spclose (child_process))
85 result = possibly_set (result, STATE_UNKNOWN);
87 /* else check the user count against warning and critical thresholds */
88 if (users >= cusers)
89 result = STATE_CRITICAL;
90 else if (users >= wusers)
91 result = STATE_WARNING;
92 else if (users >= 0)
93 result = STATE_OK;
95 if (result == STATE_UNKNOWN)
96 printf (_("Unable to read output\n"));
97 else
98 printf (_("USERS %s - %d users currently logged in\n"), state_text (result),
99 users);
101 return result;
102 }
108 /* process command-line arguments */
109 int
110 process_arguments (int argc, char **argv)
111 {
112 int c;
114 int option = 0;
115 static struct option longopts[] = {
116 {"critical", required_argument, 0, 'c'},
117 {"warning", required_argument, 0, 'w'},
118 {"version", no_argument, 0, 'V'},
119 {"help", no_argument, 0, 'h'},
120 {0, 0, 0, 0}
121 };
123 if (argc < 2)
124 usage ("\n");
126 while (1) {
127 c = getopt_long (argc, argv, "+hVvc:w:", longopts, &option);
129 if (c == -1 || c == EOF || c == 1)
130 break;
132 switch (c) {
133 case '?': /* print short usage statement if args not parsable */
134 printf (_("%s: Unknown argument: %s\n\n"), progname, optarg);
135 print_usage ();
136 exit (STATE_UNKNOWN);
137 case 'h': /* help */
138 print_help ();
139 exit (STATE_OK);
140 case 'V': /* version */
141 print_revision (progname, revision);
142 exit (STATE_OK);
143 case 'c': /* critical */
144 if (!is_intnonneg (optarg))
145 usage (_("Critical threshold must be a nonnegative integer\n"));
146 else
147 cusers = atoi (optarg);
148 break;
149 case 'w': /* warning */
150 if (!is_intnonneg (optarg))
151 usage (_("Warning threshold must be a nonnegative integer\n"));
152 else
153 wusers = atoi (optarg);
154 break;
155 }
156 }
158 c = optind;
159 if (wusers == -1 && argc > c) {
160 if (is_intnonneg (argv[c]) == FALSE)
161 usage (_("Warning threshold must be a nonnegative integer\n"));
162 else
163 wusers = atoi (argv[c++]);
164 }
166 if (cusers == -1 && argc > c) {
167 if (is_intnonneg (argv[c]) == FALSE)
168 usage (_("Warning threshold must be a nonnegative integer\n"));
169 else
170 cusers = atoi (argv[c]);
171 }
173 return OK;
174 }
180 \f
181 void
182 print_help (void)
183 {
184 print_revision (progname, revision);
186 printf (_("Copyright (c) 1999 Ethan Galstad\n"));
187 printf (_(COPYRIGHT), copyright, email);
189 printf (_("\
190 This plugin checks the number of users currently logged in on the local\n\
191 system and generates an error if the number exceeds the thresholds specified.\n"));
193 print_usage ();
195 printf (_(UT_HELP_VRSN));
197 printf (_("\
198 -w, --warning=INTEGER\n\
199 Set WARNING status if more than INTEGER users are logged in\n\
200 -c, --critical=INTEGER\n\
201 Set CRITICAL status if more than INTEGER users are logged in\n"));
203 printf (_(UT_SUPPORT));
204 }
209 void
210 print_usage (void)
211 {
212 printf ("Usage: %s -w <users> -c <users>\n", progname);
213 printf (_(UT_HLP_VRS), progname, progname);
214 }