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pkg-monitoring-plugins/plugins/check_by_ssh.c

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/*****************************************************************************
*
* Nagios check_by_ssh plugin
*
* License: GPL
* Copyright (c) 2000-2008 Nagios Plugins Development Team
*
* Description:
*
* This file contains the check_by_ssh plugin
*
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*
*****************************************************************************/
const char *progname = "check_by_ssh";
const char *copyright = "2000-2008";
const char *email = "nagiosplug-devel@lists.sourceforge.net";
#include "common.h"
#include "utils.h"
#include "netutils.h"
#include "utils_cmd.h"
#ifndef NP_MAXARGS
#define NP_MAXARGS 1024
#endif
int process_arguments (int, char **);
int validate_arguments (void);
void comm_append (const char *);
void print_help (void);
void print_usage (void);
unsigned int commands = 0;
unsigned int services = 0;
int skip_stdout = 0;
int skip_stderr = 0;
char *remotecmd = NULL;
char **commargv = NULL;
int commargc = 0;
char *hostname = NULL;
char *outputfile = NULL;
char *host_shortname = NULL;
char **service;
int passive = FALSE;
int verbose = FALSE;
int
main (int argc, char **argv)
{
char *status_text;
int cresult;
int result = STATE_UNKNOWN;
int i;
time_t local_time;
FILE *fp = NULL;
output chld_out, chld_err;
remotecmd = "";
comm_append(SSH_COMMAND);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
/* Parse extra opts if any */
argv=np_extra_opts (&argc, argv, progname);
/* process arguments */
if (process_arguments (argc, argv) == ERROR)
usage_va(_("Could not parse arguments"));
/* Set signal handling and alarm timeout */
if (signal (SIGALRM, timeout_alarm_handler) == SIG_ERR) {
usage_va(_("Cannot catch SIGALRM"));
}
alarm (timeout_interval);
/* run the command */
if (verbose) {
printf ("Command: %s\n", commargv[0]);
for (i=1; i<commargc; i++)
printf ("Argument %i: %s\n", i, commargv[i]);
}
result = cmd_run_array (commargv, &chld_out, &chld_err, 0);
if (skip_stdout == -1) /* --skip-stdout specified without argument */
skip_stdout = chld_out.lines;
if (skip_stderr == -1) /* --skip-stderr specified without argument */
skip_stderr = chld_err.lines;
/* UNKNOWN or worse if (non-skipped) output found on stderr */
if(chld_err.lines > skip_stderr) {
printf (_("Remote command execution failed: %s\n"),
chld_err.line[skip_stderr]);
return max_state_alt(result, STATE_UNKNOWN);
}
/* this is simple if we're not supposed to be passive.
* Wrap up quickly and keep the tricks below */
if(!passive) {
if (chld_out.lines > skip_stdout)
for (i = skip_stdout; i < chld_out.lines; i++)
puts (chld_out.line[i]);
else
printf (_("%s - check_by_ssh: Remote command '%s' returned status %d\n"),
state_text(result), remotecmd, result);
return result; /* return error status from remote command */
}
/*
* Passive mode
*/
/* process output */
if (!(fp = fopen (outputfile, "a"))) {
printf (_("SSH WARNING: could not open %s\n"), outputfile);
exit (STATE_UNKNOWN);
}
local_time = time (NULL);
commands = 0;
for(i = skip_stdout; i < chld_out.lines; i++) {
status_text = chld_out.line[i++];
if (i == chld_out.lines || strstr (chld_out.line[i], "STATUS CODE: ") == NULL)
die (STATE_UNKNOWN, _("%s: Error parsing output\n"), progname);
if (service[commands] && status_text
&& sscanf (chld_out.line[i], "STATUS CODE: %d", &cresult) == 1)
{
fprintf (fp, "[%d] PROCESS_SERVICE_CHECK_RESULT;%s;%s;%d;%s\n",
(int) local_time, host_shortname, service[commands++],
cresult, status_text);
}
}
/* Multiple commands and passive checking should always return OK */
return result;
}
/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
int c;
char *p1, *p2;
int option = 0;
static struct option longopts[] = {
{"version", no_argument, 0, 'V'},
{"help", no_argument, 0, 'h'},
{"verbose", no_argument, 0, 'v'},
{"fork", no_argument, 0, 'f'},
{"timeout", required_argument, 0, 't'},
{"host", required_argument, 0, 'H'},
{"port", required_argument,0,'p'},
{"output", required_argument, 0, 'O'},
{"name", required_argument, 0, 'n'},
{"services", required_argument, 0, 's'},
{"identity", required_argument, 0, 'i'},
{"user", required_argument, 0, 'u'},
{"logname", required_argument, 0, 'l'},
{"command", required_argument, 0, 'C'},
{"skip", optional_argument, 0, 'S'}, /* backwards compatibility */
{"skip-stdout", optional_argument, 0, 'S'},
{"skip-stderr", optional_argument, 0, 'E'},
{"proto1", no_argument, 0, '1'},
{"proto2", no_argument, 0, '2'},
{"use-ipv4", no_argument, 0, '4'},
{"use-ipv6", no_argument, 0, '6'},
{"ssh-option", required_argument, 0, 'o'},
{"quiet", no_argument, 0, 'q'},
{"configfile", optional_argument, 0, 'F'},
{0, 0, 0, 0}
};
if (argc < 2)
return ERROR;
for (c = 1; c < argc; c++)
if (strcmp ("-to", argv[c]) == 0)
strcpy (argv[c], "-t");
while (1) {
c = getopt_long (argc, argv, "Vvh1246fqt:H:O:p:i:u:l:C:S::E::n:s:o:F:", longopts,
&option);
if (c == -1 || c == EOF)
break;
switch (c) {
case 'V': /* version */
print_revision (progname, NP_VERSION);
exit (STATE_OK);
case 'h': /* help */
print_help ();
exit (STATE_OK);
case 'v': /* help */
verbose = TRUE;
break;
case 't': /* timeout period */
if (!is_integer (optarg))
usage_va(_("Timeout interval must be a positive integer"));
else
timeout_interval = atoi (optarg);
break;
case 'H': /* host */
host_or_die(optarg);
hostname = optarg;
break;
case 'p': /* port number */
if (!is_integer (optarg))
usage_va(_("Port must be a positive integer"));
comm_append("-p");
comm_append(optarg);
break;
case 'O': /* output file */
outputfile = optarg;
passive = TRUE;
break;
case 's': /* description of service to check */
p1 = optarg;
service = realloc (service, (++services) * sizeof(char *));
while ((p2 = index (p1, ':'))) {
*p2 = '\0';
service[services - 1] = p1;
service = realloc (service, (++services) * sizeof(char *));
p1 = p2 + 1;
}
service[services - 1] = p1;
break;
case 'n': /* short name of host in nagios configuration */
host_shortname = optarg;
break;
case 'u':
comm_append("-l");
comm_append(optarg);
break;
case 'l': /* login name */
comm_append("-l");
comm_append(optarg);
break;
case 'i': /* identity */
comm_append("-i");
comm_append(optarg);
break;
case '1': /* Pass these switches directly to ssh */
comm_append("-1");
break;
case '2': /* 1 to force version 1, 2 to force version 2 */
comm_append("-2");
break;
case '4': /* -4 for IPv4 */
comm_append("-4");
break;
case '6': /* -6 for IPv6 */
comm_append("-6");
break;
case 'f': /* fork to background */
comm_append("-f");
break;
case 'C': /* Command for remote machine */
commands++;
if (commands > 1)
asprintf (&remotecmd, "%s;echo STATUS CODE: $?;", remotecmd);
asprintf (&remotecmd, "%s%s", remotecmd, optarg);
break;
case 'S': /* skip n (or all) lines on stdout */
if (optarg == NULL)
skip_stdout = -1; /* skip all output on stdout */
else if (!is_integer (optarg))
usage_va(_("skip-stdout argument must be an integer"));
else
skip_stdout = atoi (optarg);
break;
case 'E': /* skip n (or all) lines on stderr */
if (optarg == NULL)
skip_stderr = -1; /* skip all output on stderr */
else if (!is_integer (optarg))
usage_va(_("skip-stderr argument must be an integer"));
else
skip_stderr = atoi (optarg);
break;
case 'o': /* Extra options for the ssh command */
comm_append("-o");
comm_append(optarg);
break;
case 'q': /* Tell the ssh command to be quiet */
comm_append("-q");
break;
case 'F': /* ssh configfile */
comm_append("-F");
comm_append(optarg);
break;
default: /* help */
usage5();
}
}
c = optind;
if (hostname == NULL) {
if (c <= argc) {
die (STATE_UNKNOWN, _("%s: You must provide a host name\n"), progname);
}
host_or_die(argv[c]);
hostname = argv[c++];
}
if (strlen(remotecmd) == 0) {
for (; c < argc; c++)
if (strlen(remotecmd) > 0)
asprintf (&remotecmd, "%s %s", remotecmd, argv[c]);
else
asprintf (&remotecmd, "%s", argv[c]);
}
if (commands > 1 || passive)
asprintf (&remotecmd, "%s;echo STATUS CODE: $?;", remotecmd);
if (remotecmd == NULL || strlen (remotecmd) <= 1)
usage_va(_("No remotecmd"));
comm_append(hostname);
comm_append(remotecmd);
return validate_arguments ();
}
void
comm_append (const char *str)
{
if (++commargc > NP_MAXARGS)
die(STATE_UNKNOWN, _("%s: Argument limit of %d exceeded\n"), progname, NP_MAXARGS);
if ((commargv = (char **)realloc(commargv, (commargc+1) * sizeof(char *))) == NULL)
die(STATE_UNKNOWN, _("Can not (re)allocate 'commargv' buffer\n"));
commargv[commargc-1] = strdup(str);
commargv[commargc] = NULL;
}
int
validate_arguments (void)
{
if (remotecmd == NULL || hostname == NULL)
return ERROR;
if (passive && commands != services)
die (STATE_UNKNOWN, _("%s: In passive mode, you must provide a service name for each command.\n"), progname);
if (passive && host_shortname == NULL)
die (STATE_UNKNOWN, _("%s: In passive mode, you must provide the host short name from the nagios configs.\n"), progname);
return OK;
}
void
print_help (void)
{
print_revision (progname, NP_VERSION);
printf ("Copyright (c) 1999 Karl DeBisschop <kdebisschop@users.sourceforge.net>\n");
printf (COPYRIGHT, copyright, email);
printf (_("This plugin uses SSH to execute commands on a remote host"));
printf ("\n\n");
print_usage ();
printf (UT_HELP_VRSN);
printf (UT_EXTRA_OPTS);
printf (UT_HOST_PORT, 'p', "none");
printf (UT_IPv46);
printf (" %s\n", "-1, --proto1");
printf (" %s\n", _("tell ssh to use Protocol 1 [optional]"));
printf (" %s\n", "-2, --proto2");
printf (" %s\n", _("tell ssh to use Protocol 2 [optional]"));
printf (" %s\n", "-S, --skip-stdout[=n]");
printf (" %s\n", _("Ignore all or (if specified) first n lines on STDOUT [optional]"));
printf (" %s\n", "-E, --skip-stderr[=n]");
printf (" %s\n", _("Ignore all or (if specified) first n lines on STDERR [optional]"));
printf (" %s\n", "-f");
printf (" %s\n", _("tells ssh to fork rather than create a tty [optional]. This will always return OK if ssh is executed"));
printf (" %s\n","-C, --command='COMMAND STRING'");
printf (" %s\n", _("command to execute on the remote machine"));
printf (" %s\n","-l, --logname=USERNAME");
printf (" %s\n", _("SSH user name on remote host [optional]"));
printf (" %s\n","-i, --identity=KEYFILE");
printf (" %s\n", _("identity of an authorized key [optional]"));
printf (" %s\n","-O, --output=FILE");
printf (" %s\n", _("external command file for nagios [optional]"));
printf (" %s\n","-s, --services=LIST");
printf (" %s\n", _("list of nagios service names, separated by ':' [optional]"));
printf (" %s\n","-n, --name=NAME");
printf (" %s\n", _("short name of host in nagios configuration [optional]"));
printf (" %s\n","-o, --ssh-option=OPTION");
printf (" %s\n", _("Call ssh with '-o OPTION' (may be used multiple times) [optional]"));
printf (" %s\n","-F, --configfile");
printf (" %s\n", _("Tell ssh to use this configfile [optional]"));
printf (" %s\n","-q, --quiet");
printf (" %s\n", _("Tell ssh to suppress warning and diagnostic messages [optional]"));
printf (UT_WARN_CRIT);
printf (UT_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
printf (UT_VERBOSE);
printf("\n");
printf (" %s\n", _("The most common mode of use is to refer to a local identity file with"));
printf (" %s\n", _("the '-i' option. In this mode, the identity pair should have a null"));
printf (" %s\n", _("passphrase and the public key should be listed in the authorized_keys"));
printf (" %s\n", _("file of the remote host. Usually the key will be restricted to running"));
printf (" %s\n", _("only one command on the remote server. If the remote SSH server tracks"));
printf (" %s\n", _("invocation arguments, the one remote program may be an agent that can"));
printf (" %s\n", _("execute additional commands as proxy"));
printf("\n");
printf (" %s\n", _("To use passive mode, provide multiple '-C' options, and provide"));
printf (" %s\n", _("all of -O, -s, and -n options (servicelist order must match '-C'options)"));
printf ("\n");
printf ("%s\n", _("Examples:"));
printf (" %s\n", "$ check_by_ssh -H localhost -n lh -s c1:c2:c3 -C uptime -C uptime -C uptime -O /tmp/foo");
printf (" %s\n", "$ cat /tmp/foo");
printf (" %s\n", "[1080933700] PROCESS_SERVICE_CHECK_RESULT;flint;c1;0; up 2 days");
printf (" %s\n", "[1080933700] PROCESS_SERVICE_CHECK_RESULT;flint;c2;0; up 2 days");
printf (" %s\n", "[1080933700] PROCESS_SERVICE_CHECK_RESULT;flint;c3;0; up 2 days");
printf(UT_SUPPORT);
}
void
print_usage (void)
{
printf ("%s\n", _("Usage:"));
printf (" %s -H <host> -C <command> [-fqv] [-1|-2] [-4|-6]\n"
" [-S [lines]] [-E [lines]] [-t timeout] [-i identity]\n"
" [-l user] [-n name] [-s servicelist] [-O outputfile]\n"
" [-p port] [-o ssh-option] [-F configfile]\n",
progname);
}
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