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1/******************************************************************************
2*
3* Nagios check_by_ssh plugin
4*
5* License: GPL
6* Copyright (c) 1999-2006 nagios-plugins team
7*
8* Last Modified: $Date: 2007/01/28 21:46:40 $
9*
10* Description:
11*
12* This file contains the check_by_ssh plugin
13*
14* License Information:
15*
16* This program is free software; you can redistribute it and/or modify
17* it under the terms of the GNU General Public License as published by
18* the Free Software Foundation; either version 2 of the License, or
19* (at your option) any later version.
20*
21* This program is distributed in the hope that it will be useful,
22* but WITHOUT ANY WARRANTY; without even the implied warranty of
23* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24* GNU General Public License for more details.
25*
26* You should have received a copy of the GNU General Public License
27* along with this program; if not, write to the Free Software
28* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29*
30* $Id: check_by_ssh.c,v 1.41 2007/01/28 21:46:40 hweiss Exp $
31*
32******************************************************************************/
33
34const char *progname = "check_by_ssh";
35const char *revision = "$Revision: 1.41 $";
36const char *copyright = "2000-2006";
37const char *email = "nagiosplug-devel@lists.sourceforge.net";
38
39#include "common.h"
40#include "netutils.h"
41#include "utils.h"
42#include "runcmd.h"
43
44int process_arguments (int, char **);
45int validate_arguments (void);
46void print_help (void);
47void print_usage (void);
48
49int commands = 0;
50int services = 0;
51int skip = 0;
52char *remotecmd = NULL;
53char *comm = NULL;
54char *hostname = NULL;
55char *outputfile = NULL;
56char *host_shortname = NULL;
57char **service;
58int passive = FALSE;
59int verbose = FALSE;
60
61int
62main (int argc, char **argv)
63{
64
65 char *status_text;
66 int cresult;
67 int result = STATE_UNKNOWN;
68 int i;
69 time_t local_time;
70 FILE *fp = NULL;
71 struct output chld_out, chld_err;
72
73 remotecmd = "";
74 comm = strdup (SSH_COMMAND);
75
76 setlocale (LC_ALL, "");
77 bindtextdomain (PACKAGE, LOCALEDIR);
78 textdomain (PACKAGE);
79
80 /* process arguments */
81 if (process_arguments (argc, argv) == ERROR)
82 usage_va(_("Could not parse arguments"));
83
84 /* Set signal handling and alarm timeout */
85 if (signal (SIGALRM, popen_timeout_alarm_handler) == SIG_ERR) {
86 usage_va(_("Cannot catch SIGALRM"));
87 }
88 alarm (timeout_interval);
89
90 /* run the command */
91 if (verbose)
92 printf ("%s\n", comm);
93
94 result = np_runcmd(comm, &chld_out, &chld_err, 0);
95 /* UNKNOWN if output found on stderr */
96 if(chld_err.buflen && !skip) {
97 printf(_("Remote command execution failed: %s\n"),
98 chld_err.buflen ? chld_err.buf : _("Unknown error"));
99 return STATE_UNKNOWN;
100 }
101
102 /* this is simple if we're not supposed to be passive.
103 * Wrap up quickly and keep the tricks below */
104 if(!passive) {
105 printf ("%s\n", skip < chld_out.lines ? chld_out.line[skip] : chld_out.buf);
106 return result; /* return error status from remote command */
107 }
108
109
110 /*
111 * Passive mode
112 */
113
114 /* process output */
115 if (!(fp = fopen (outputfile, "a"))) {
116 printf (_("SSH WARNING: could not open %s\n"), outputfile);
117 exit (STATE_UNKNOWN);
118 }
119
120 local_time = time (NULL);
121 commands = 0;
122 for(i = skip; chld_out.line[i]; i++) {
123 status_text = strstr (chld_out.line[i], "STATUS CODE: ");
124 if (status_text == NULL) {
125 printf ("%s", chld_out.line[i]);
126 return result;
127 }
128 if (service[commands] && status_text
129 && sscanf (status_text, "STATUS CODE: %d", &cresult) == 1)
130 {
131 fprintf (fp, "[%d] PROCESS_SERVICE_CHECK_RESULT;%s;%s;%d;%s\n",
132 (int) local_time, host_shortname, service[commands++],
133 cresult, chld_out.line[i]);
134 }
135 }
136
137 /* force an OK state */
138 return result;
139}
140
141/* process command-line arguments */
142int
143process_arguments (int argc, char **argv)
144{
145 int c;
146 char *p1, *p2;
147
148 int option = 0;
149 static struct option longopts[] = {
150 {"version", no_argument, 0, 'V'},
151 {"help", no_argument, 0, 'h'},
152 {"verbose", no_argument, 0, 'v'},
153 {"fork", no_argument, 0, 'f'},
154 {"timeout", required_argument, 0, 't'},
155 {"host", required_argument, 0, 'H'},
156 {"port", required_argument,0,'p'},
157 {"output", required_argument, 0, 'O'},
158 {"name", required_argument, 0, 'n'},
159 {"services", required_argument, 0, 's'},
160 {"identity", required_argument, 0, 'i'},
161 {"user", required_argument, 0, 'u'},
162 {"logname", required_argument, 0, 'l'},
163 {"command", required_argument, 0, 'C'},
164 {"skip", required_argument, 0, 'S'},
165 {"proto1", no_argument, 0, '1'},
166 {"proto2", no_argument, 0, '2'},
167 {"use-ipv4", no_argument, 0, '4'},
168 {"use-ipv6", no_argument, 0, '6'},
169 {"ssh-option", required_argument, 0, 'o'},
170 {"quiet", no_argument, 0, 'q'},
171 {0, 0, 0, 0}
172 };
173
174 if (argc < 2)
175 return ERROR;
176
177 for (c = 1; c < argc; c++)
178 if (strcmp ("-to", argv[c]) == 0)
179 strcpy (argv[c], "-t");
180
181 while (1) {
182 c = getopt_long (argc, argv, "Vvh1246fqt:H:O:p:i:u:l:C:S:n:s:o:", longopts,
183 &option);
184
185 if (c == -1 || c == EOF)
186 break;
187
188 switch (c) {
189 case 'V': /* version */
190 print_revision (progname, revision);
191 exit (STATE_OK);
192 case 'h': /* help */
193 print_help ();
194 exit (STATE_OK);
195 case 'v': /* help */
196 verbose = TRUE;
197 break;
198 case 't': /* timeout period */
199 if (!is_integer (optarg))
200 usage_va(_("Timeout interval must be a positive integer"));
201 else
202 timeout_interval = atoi (optarg);
203 break;
204 case 'H': /* host */
205 host_or_die(optarg);
206 hostname = optarg;
207 break;
208 case 'p': /* port number */
209 if (!is_integer (optarg))
210 usage_va(_("Port must be a positive integer"));
211 asprintf (&comm,"%s -p %s", comm, optarg);
212 break;
213 case 'O': /* output file */
214 outputfile = optarg;
215 passive = TRUE;
216 break;
217 case 's': /* description of service to check */
218 p1 = optarg;
219 service = realloc (service, (++services) * sizeof(char *));
220 while ((p2 = index (p1, ':'))) {
221 *p2 = '\0';
222 service[services - 1] = p1;
223 service = realloc (service, (++services) * sizeof(char *));
224 p1 = p2 + 1;
225 }
226 service[services - 1] = p1;
227 break;
228 case 'n': /* short name of host in nagios configuration */
229 host_shortname = optarg;
230 break;
231
232 case 'u':
233 c = 'l';
234 case 'l': /* login name */
235 case 'i': /* identity */
236 asprintf (&comm, "%s -%c %s", comm, c, optarg);
237 break;
238
239 case '1': /* Pass these switches directly to ssh */
240 case '2': /* 1 to force version 1, 2 to force version 2 */
241 case '4': /* -4 for IPv4 */
242 case '6': /* -6 for IPv6 */
243 case 'f': /* fork to background */
244 asprintf (&comm, "%s -%c", comm, c);
245 break;
246 case 'C': /* Command for remote machine */
247 commands++;
248 if (commands > 1)
249 asprintf (&remotecmd, "%s;echo STATUS CODE: $?;", remotecmd);
250 asprintf (&remotecmd, "%s%s", remotecmd, optarg);
251 break;
252 case 'S': /* Skip n lines in the output to ignore system banner */
253 if (!is_integer (optarg))
254 usage_va(_("skip lines must be an integer"));
255 else
256 skip = atoi (optarg);
257 break;
258 case 'o': /* Extra options for the ssh command */
259 asprintf (&comm, "%s -%c '%s'", comm, c, optarg);
260 break;
261 case 'q': /* Tell the ssh command to be quiet */
262 asprintf (&comm, "%s -%c", comm, c);
263 break;
264 default: /* help */
265 usage5();
266 }
267 }
268
269 c = optind;
270 if (hostname == NULL) {
271 if (c <= argc) {
272 die (STATE_UNKNOWN, _("%s: You must provide a host name\n"), progname);
273 }
274 host_or_die(argv[c]);
275 hostname = argv[c++];
276 }
277
278 if (strlen(remotecmd) == 0) {
279 for (; c < argc; c++)
280 if (strlen(remotecmd) > 0)
281 asprintf (&remotecmd, "%s %s", remotecmd, argv[c]);
282 else
283 asprintf (&remotecmd, "%s", argv[c]);
284 }
285
286 if (commands > 1)
287 asprintf (&remotecmd, "%s;echo STATUS CODE: $?;", remotecmd);
288
289 if (remotecmd == NULL || strlen (remotecmd) <= 1)
290 usage_va(_("No remotecmd"));
291
292 asprintf (&comm, "%s %s '%s'", comm, hostname, remotecmd);
293
294 return validate_arguments ();
295}
296
297
298
299int
300validate_arguments (void)
301{
302 if (remotecmd == NULL || hostname == NULL)
303 return ERROR;
304
305 if (passive && commands != services)
306 die (STATE_UNKNOWN, _("%s: In passive mode, you must provide a service name for each command.\n"), progname);
307
308 if (passive && host_shortname == NULL)
309 die (STATE_UNKNOWN, _("%s: In passive mode, you must provide the host short name from the nagios configs.\n"), progname);
310
311 return OK;
312}
313
314
315void
316print_help (void)
317{
318 print_revision (progname, revision);
319
320 printf ("Copyright (c) 1999 Karl DeBisschop <kdebisschop@users.sourceforge.net>\n");
321 printf (COPYRIGHT, copyright, email);
322
323 printf (_("This plugin uses SSH to execute commands on a remote host"));
324
325 printf ("\n\n");
326
327 print_usage ();
328
329 printf (_(UT_HELP_VRSN));
330
331 printf (_(UT_HOST_PORT), 'p', "none");
332
333 printf (_(UT_IPv46));
334
335 printf (" %s\n", "-1, --proto1");
336 printf (" %s\n", _("tell ssh to use Protocol 1"));
337 printf (" %s\n", "-2, --proto2");
338 printf (" %s\n", _("tell ssh to use Protocol 2"));
339 printf (" %s\n", "-S, --skip=n");
340 printf (" %s\n", _("Ignore first n lines on STDERR (to suppress a logon banner)"));
341 printf (" %s\n", "-f");
342 printf (" %s\n", _("tells ssh to fork rather than create a tty"));
343 printf (" %s\n","-C, --command='COMMAND STRING'");
344 printf (" %s\n", _("command to execute on the remote machine"));
345 printf (" %s\n","-l, --logname=USERNAME");
346 printf (" %s\n", _("SSH user name on remote host [optional]"));
347 printf (" %s\n","-i, --identity=KEYFILE");
348 printf (" %s\n", _("identity of an authorized key [optional]"));
349 printf (" %s\n","-O, --output=FILE");
350 printf (" %s\n", _("external command file for nagios [optional]"));
351 printf (" %s\n","-s, --services=LIST");
352 printf (" %s\n", _("list of nagios service names, separated by ':' [optional]"));
353 printf (" %s\n","-n, --name=NAME");
354 printf (" %s\n", _("short name of host in nagios configuration [optional]"));
355 printf (" %s\n","-o, --ssh-option=OPTION");
356 printf (" %s\n", _("Call ssh with '-o OPTION' (may be used multiple times) [optional]"));
357 printf (" %s\n","-q, --quiet");
358 printf (" %s\n", _("Tell ssh to suppress warning and diagnostic messages [optional]"));
359 printf (_(UT_WARN_CRIT));
360 printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
361 printf (" %s\n", _("The most common mode of use is to refer to a local identity file with"));
362 printf (" %s\n", _("the '-i' option. In this mode, the identity pair should have a null"));
363 printf (" %s\n", _("passphrase and the public key should be listed in the authorized_keys"));
364 printf (" %s\n", _("file of the remote host. Usually the key will be restricted to running"));
365 printf (" %s\n", _("only one command on the remote server. If the remote SSH server tracks"));
366 printf (" %s\n", _("invocation arguments, the one remote program may be an agent that can"));
367 printf (" %s\n", _("execute additional commands as proxy"));
368 printf (" %s\n", _("To use passive mode, provide multiple '-C' options, and provide"));
369 printf (" %s\n", _("all of -O, -s, and -n options (servicelist order must match '-C'options)"));
370 printf ("\n");
371 printf ("%s\n", _("Examples:"));
372 printf (" %s\n", "$ check_by_ssh -H localhost -n lh -s c1:c2:c3 -C uptime -C uptime -C uptime -O /tmp/foo");
373 printf (" %s\n", "$ cat /tmp/foo");
374 printf (" %s\n", "[1080933700] PROCESS_SERVICE_CHECK_RESULT;flint;c1;0; up 2 days");
375 printf (" %s\n", "[1080933700] PROCESS_SERVICE_CHECK_RESULT;flint;c2;0; up 2 days");
376 printf (" %s\n", "[1080933700] PROCESS_SERVICE_CHECK_RESULT;flint;c3;0; up 2 days");
377 printf (_(UT_SUPPORT));
378}
379
380
381
382void
383print_usage (void)
384{
385 printf (_("Usage:"));
386 printf(" %s [-fq46] [-t timeout] [-i identity] [-l user] -H <host> -C <command>",progname);
387 printf(" [-n name] [-s servicelist] [-O outputfile] [-p port] [-o ssh-option]\n");
388}