1 files changed, 412 insertions, 0 deletions

diff --git a/plugins/check_by_ssh.c b/plugins/check_by_ssh.c
new file mode 100644
index 0000000..a81b333
--- /dev/null
+++ b/plugins/check_by_ssh.c
@@ -0,0 +1,412 @@
+/******************************************************************************
+ *
+ * This file is part of the Nagios Plugins.
+ *
+ * Copyright (c) 1999, 2000, 2001 Karl DeBisschop <karl@debisschop.net>
+ *
+ * The Nagios Plugins are free software; you can redistribute them
+ * and/or modify them 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.
+ *
+ * $Id$
+ *
+ *****************************************************************************/
+ 
+#define PROGRAM check_by_ssh
+#define DESCRIPTION "Run checks on a remote system using ssh, wrapping the proper timeout around the ssh invocation."
+#define AUTHOR "Karl DeBisschop"
+#define EMAIL "karl@debisschop.net"
+#define COPYRIGHTDATE "1999, 2000, 2001"
+
+#include "config.h"
+#include "common.h"
+#include "popen.h"
+#include "utils.h"
+#include <time.h>
+
+#define PROGNAME "check_by_ssh"
+
+int process_arguments (int, char **);
+int call_getopt (int, char **);
+int validate_arguments (void);
+void print_help (char *command_name);
+void print_usage (void);
+
+
+int commands;
+char *remotecmd = NULL;
+char *comm = NULL;
+char *hostname = NULL;
+char *outputfile = NULL;
+char *host_shortname = NULL;
+char *servicelist = NULL;
+int passive = FALSE;
+int verbose = FALSE;
+
+
+int
+main (int argc, char **argv)
+{
+
+        char input_buffer[MAX_INPUT_BUFFER] = "";
+        char *result_text = NULL;
+        char *status_text;
+        char *output = NULL;
+        char *eol = NULL;
+        char *srvc_desc = NULL;
+        int cresult;
+        int result = STATE_UNKNOWN;
+        time_t local_time;
+        FILE *fp = NULL;
+
+
+        /* process arguments */
+        if (process_arguments (argc, argv) == ERROR)
+                usage ("Could not parse arguments\n");
+
+
+        /* Set signal handling and alarm timeout */
+        if (signal (SIGALRM, popen_timeout_alarm_handler) == SIG_ERR) {
+                printf ("Cannot catch SIGALRM");
+                return STATE_UNKNOWN;
+        }
+        alarm (timeout_interval);
+
+
+        /* run the command */
+
+        if (verbose)
+                printf ("%s\n", comm);
+
+        child_process = spopen (comm);
+
+        if (child_process == NULL) {
+                printf ("Unable to open pipe: %s", comm);
+                return STATE_UNKNOWN;
+        }
+
+
+        /* open STDERR  for spopen */
+        child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
+        if (child_stderr == NULL) {
+                printf ("Could not open stderr for %s\n", SSH_COMMAND);
+        }
+
+
+        /* get results from remote command */
+        result_text = realloc (result_text, 1);
+        result_text[0] = 0;
+        while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process))
+                result_text = strscat (result_text, input_buffer);
+
+
+        /* WARNING if output found on stderr */
+        if (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr)) {
+                printf ("%s\n", input_buffer);
+                return STATE_WARNING;
+        }
+        (void) fclose (child_stderr);
+
+
+        /* close the pipe */
+        result = spclose (child_process);
+
+
+        /* process output */
+        if (passive) {
+
+                if (!(fp = fopen (outputfile, "a"))) {
+                        printf ("SSH WARNING: could not open %s\n", outputfile);
+                        exit (STATE_UNKNOWN);
+                }
+
+                time (&local_time);
+                srvc_desc = strtok (servicelist, ":");
+                while (result_text != NULL) {
+                        status_text = (strstr (result_text, "STATUS CODE: "));
+                        if (status_text == NULL) {
+                                printf ("%s", result_text);
+                                return result;
+                        }
+                        output = result_text;
+                        result_text = strnl (status_text);
+                        eol = strpbrk (output, "\r\n");
+                        if (eol != NULL)
+                                eol[0] = 0;
+                        if (srvc_desc && status_text
+                                        && sscanf (status_text, "STATUS CODE: %d", &cresult) == 1) {
+                                fprintf (fp, "%d PROCESS_SERVICE_CHECK_RESULT;%s;%s;%d;%s\n",
+                                                                 (int) local_time, host_shortname, srvc_desc, cresult,
+                                                                 output);
+                                srvc_desc = strtok (NULL, ":");
+                        }
+                }
+
+        }
+
+        /* print the first line from the remote command */
+        else {
+                eol = strpbrk (result_text, "\r\n");
+                if (eol)
+                        eol[0] = 0;
+                printf ("%s\n", result_text);
+
+        }
+
+
+        /* return error status from remote command */
+        return result;
+}
+
+
+
+
+
+/* process command-line arguments */
+int
+process_arguments (int argc, char **argv)
+{
+        int c;
+
+        if (argc < 2)
+                return ERROR;
+
+        remotecmd = realloc (remotecmd, 1);
+        remotecmd[0] = 0;
+
+        for (c = 1; c < argc; c++)
+                if (strcmp ("-to", argv[c]) == 0)
+                        strcpy (argv[c], "-t");
+
+        comm = strscpy (comm, SSH_COMMAND);
+
+        c = 0;
+        while (c += (call_getopt (argc - c, &argv[c]))) {
+
+                if (argc <= c)
+                        break;
+
+                if (hostname == NULL) {
+                        if (!is_host (argv[c]))
+                                terminate (STATE_UNKNOWN, "%s: Invalid host name %s\n", PROGNAME,
+                                                                         argv[c]);
+                        hostname = argv[c];
+                }
+                else if (remotecmd == NULL) {
+                        remotecmd = strscpy (remotecmd, argv[c++]);
+                        for (; c < argc; c++)
+                                remotecmd = ssprintf (remotecmd, "%s %s", remotecmd, argv[c]);
+                }
+
+        }
+
+        if (commands > 1)
+                remotecmd = strscat (remotecmd, ";echo STATUS CODE: $?;");
+
+        if (remotecmd == NULL || strlen (remotecmd) <= 1)
+                usage ("No remotecmd\n");
+
+        comm = ssprintf (comm, "%s %s '%s'", comm, hostname, remotecmd);
+
+        return validate_arguments ();
+}
+
+
+
+
+
+/* Call getopt */
+int
+call_getopt (int argc, char **argv)
+{
+        int c, i = 1;
+
+#ifdef HAVE_GETOPT_H
+        int option_index = 0;
+        static struct option long_options[] = {
+                {"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'},
+                {0, 0, 0, 0}
+        };
+#endif
+
+        while (1) {
+#ifdef HAVE_GETOPT_H
+                c =
+                        getopt_long (argc, argv, "+?Vvhft:H:O:P:p:i:u:l:C:n:s:", long_options,
+                                                                         &option_index);
+#else
+                c = getopt (argc, argv, "+?Vvhft:H:O:P:p:i:u:l:C:n:s:");
+#endif
+
+                if (c == -1 || c == EOF)
+                        break;
+
+                i++;
+                switch (c) {
+                case 't':
+                case 'H':
+                case 'O':
+                case 'p':
+                case 'i':
+                case 'u':
+                case 'l':
+                case 'n':
+                case 's':
+                        i++;
+                }
+
+                switch (c) {
+                case '?':                                                                       /* help */
+                        print_usage ();
+                        exit (STATE_UNKNOWN);
+                case 'V':                                                                       /* version */
+                        print_revision (PROGNAME, "$Revision$");
+                        exit (STATE_OK);
+                case 'h':                                                                       /* help */
+                        print_help (PROGNAME);
+                        exit (STATE_OK);
+                case 'v':                                                                       /* help */
+                        verbose = TRUE;
+                        break;
+                case 'f':                                                                       /* fork to background */
+                        comm = ssprintf (comm, "%s -f", comm);
+                        break;
+                case 't':                                                                       /* timeout period */
+                        if (!is_integer (optarg))
+                                usage2 ("timeout interval must be an integer", optarg);
+                        timeout_interval = atoi (optarg);
+                        break;
+                case 'H':                                                                       /* host */
+                        if (!is_host (optarg))
+                                usage2 ("invalid host name", optarg);
+                        hostname = optarg;
+                        break;
+                case 'P': /* port number */
+                case 'p': /* port number */
+                        if (!is_integer (optarg))
+                                usage2 ("port must be an integer", optarg);
+                        comm = ssprintf (comm,"%s -p %s", comm, optarg);
+                        break;
+                case 'O':                                                                       /* output file */
+                        outputfile = optarg;
+                        passive = TRUE;
+                        break;
+                case 's':                                                                       /* description of service to check */
+                        servicelist = optarg;
+                        break;
+                case 'n':                                                                       /* short name of host in nagios configuration */
+                        host_shortname = optarg;
+                        break;
+                case 'u':
+                        c = 'l';
+                case 'l':                                                                       /* login name */
+                case 'i':                                                                       /* identity */
+                        comm = ssprintf (comm, "%s -%c %s", comm, c, optarg);
+                        break;
+                case 'C':                                                                       /* Command for remote machine */
+                        commands++;
+                        if (commands > 1)
+                                remotecmd = strscat (remotecmd, ";echo STATUS CODE: $?;");
+                        remotecmd = strscat (remotecmd, optarg);
+                }
+        }
+        return i;
+}
+
+
+
+
+
+int
+validate_arguments (void)
+{
+        if (remotecmd == NULL || hostname == NULL)
+                return ERROR;
+        return OK;
+}
+
+
+
+
+
+void
+print_help (char *cmd)
+{
+        print_revision (cmd, "$Revision$");
+
+        printf
+                ("Copyright (c) 1999    Karl DeBisschop (kdebisschop@alum.mit.edu)\n\n"
+                 "This plugin will execute a command on a remote host using SSH\n\n");
+
+        print_usage ();
+
+        printf
+                ("\nOptions:\n"
+                 "-H, --hostname=HOST\n"
+                 "   name or IP address of remote host\n"
+                 "-C, --command='COMMAND STRING'\n"
+                 "   command to execute on the remote machine\n"
+                 "-f tells ssh to fork rather than create a tty\n"
+                 "-t, --timeout=INTEGER\n"
+                 "   specify timeout (default: %d seconds) [optional]\n"
+                 "-l, --logname=USERNAME\n"
+                 "   SSH user name on remote host [optional]\n"
+                 "-i, --identity=KEYFILE\n"
+                 "   identity of an authorized key [optional]\n"
+                 "-O, --output=FILE\n"
+                 "   external command file for nagios [optional]\n"
+                 "-s, --services=LIST\n"
+                 "   list of nagios service names, separated by ':' [optional]\n"
+                 "-n, --name=NAME\n"
+                 "   short name of host in nagios configuration [optional]\n"
+                 "\n"
+                 "The most common mode of use is to refer to a local identity file with\n"
+                 "the '-i' option. In this mode, the identity pair should have a null\n"
+                 "passphrase and the public key should be listed in the authorized_keys\n"
+                 "file of the remote host. Usually the key will be restricted to running\n"
+                 "only one command on the remote server. If the remote SSH server tracks\n"
+                 "invocation agruments, the one remote program may be an agent that can\n"
+                 "execute additional commands as proxy\n"
+                 "\n"
+                 "To use passive mode, provide multiple '-C' options, and provide\n"
+                 "all of -O, -s, and -n options (servicelist order must match '-C'\n"
+                 "options)\n", DEFAULT_SOCKET_TIMEOUT);
+}
+
+
+
+
+
+void
+print_usage (void)
+{
+        printf
+                ("Usage:\n"
+                 "check_by_ssh [-f] [-t timeout] [-i identity] [-l user] -H <host> <command>\n"
+                 "             [-n name] [-s servicelist] [-O outputfile] [-P port]\n"
+                 "check_by_ssh  -V prints version info\n"
+                 "check_by_ssh  -h prints more detailed help\n");
+}