1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
/*****************************************************************************
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*****************************************************************************/
#include "common.h"
#include "popen.h"
#include "utils.h"
const char *progname = "check_users";
const char *revision = "$Revision$";
const char *copyright = "2002-2003";
const char *authors = "Nagios Plugin Development Team";
const char *email = "nagiosplug-devel@lists.sourceforge.net";
const char *summary = "\
This plugin checks the number of users currently logged in on the local\n\
system and generates an error if the number exceeds the thresholds specified.\n";
const char *option_summary = "-w <users> -c <users>";
const char *options = "\
-w, --warning=INTEGER\n\
Set WARNING status if more than INTEGER users are logged in\n\
-c, --critical=INTEGER\n\
Set CRITICAL status if more than INTEGER users are logged in\n";
const char *standard_options = "\
-h, --help\n\
Print detailed help screen\n\
-V, --version\n\
Print version information\n\n";
#define possibly_set(a,b) ((a) == 0 ? (b) : 0)
int process_arguments (int, char **);
void print_usage (void);
void print_help (void);
int wusers = -1;
int cusers = -1;
int
main (int argc, char **argv)
{
int users = -1;
int result = STATE_OK;
char input_buffer[MAX_INPUT_BUFFER];
if (process_arguments (argc, argv) == ERROR)
usage ("Could not parse arguments\n");
/* run the command */
child_process = spopen (WHO_COMMAND);
if (child_process == NULL) {
printf ("Could not open pipe: %s\n", WHO_COMMAND);
return STATE_UNKNOWN;
}
child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
if (child_stderr == NULL)
printf ("Could not open stderr for %s\n", WHO_COMMAND);
users = 0;
while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
/* increment 'users' on all lines except total user count */
if (input_buffer[0] != '#') {
users++;
continue;
}
/* get total logged in users */
if (sscanf (input_buffer, "# users=%d", &users) == 1)
break;
}
/* check STDERR */
if (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
result = possibly_set (result, STATE_UNKNOWN);
(void) fclose (child_stderr);
/* close the pipe */
if (spclose (child_process))
result = possibly_set (result, STATE_UNKNOWN);
/* else check the user count against warning and critical thresholds */
if (users >= cusers)
result = STATE_CRITICAL;
else if (users >= wusers)
result = STATE_WARNING;
else if (users >= 0)
result = STATE_OK;
if (result == STATE_UNKNOWN)
printf ("Unable to read output\n");
else
printf ("USERS %s - %d users currently logged in\n", state_text (result),
users);
return result;
}
/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
int c;
int option_index = 0;
static struct option long_options[] = {
{"critical", required_argument, 0, 'c'},
{"warning", required_argument, 0, 'w'},
{"version", no_argument, 0, 'V'},
{"help", no_argument, 0, 'h'},
{0, 0, 0, 0}
};
if (argc < 2)
usage ("\n");
while (1) {
c = getopt_long (argc, argv, "+hVvc:w:", long_options, &option_index);
if (c == -1 || c == EOF || c == 1)
break;
switch (c) {
case '?': /* print short usage statement if args not parsable */
printf ("%s: Unknown argument: %s\n\n", progname, optarg);
print_usage ();
exit (STATE_UNKNOWN);
case 'h': /* help */
print_help ();
exit (STATE_OK);
case 'V': /* version */
print_revision (progname, revision);
exit (STATE_OK);
case 'c': /* critical */
if (!is_intnonneg (optarg))
usage ("Critical threshold must be a nonnegative integer\n");
cusers = atoi (optarg);
break;
case 'w': /* warning */
if (!is_intnonneg (optarg))
usage ("Warning threshold must be a nonnegative integer\n");
wusers = atoi (optarg);
break;
}
}
c = optind;
if (wusers == -1 && argc > c) {
if (is_intnonneg (argv[c]) == FALSE)
usage ("Warning threshold must be a nonnegative integer\n");
wusers = atoi (argv[c++]);
}
if (cusers == -1 && argc > c) {
if (is_intnonneg (argv[c]) == FALSE)
usage ("Warning threshold must be a nonnegative integer\n");
cusers = atoi (argv[c]);
}
return OK;
}
void
print_help (void)
{
print_revision (progname, revision);
printf ("Copyright (c) %s %s\n\t<%s>\n\n", copyright, authors, email);
printf (summary);
print_usage ();
printf ("\nOptions:\n");
printf (options);
printf (standard_options);
support ();
}
void
print_usage (void)
{
printf ("Usage: %s %s\n", progname, option_summary);
printf (" %s (-h|--help)\n", progname);
printf (" %s (-V|--version)\n", progname);
}
|
