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-rw-r--r--plugins/check_tcp.c563
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diff --git a/plugins/check_tcp.c b/plugins/check_tcp.c
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+++ b/plugins/check_tcp.c
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+/******************************************************************************
+ *
+ * This file is part of the Nagios Plugins.
+ *
+ * Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>
+ *
+ * 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_tcp
+#define DESCRIPTION "Check a TCP port"
+#define AUTHOR "Ethan Galstad"
+#define EMAIL "nagios@nagios.org"
+#define COPYRIGHTDATE "1999"
+
+#include "config.h"
+#include "common.h"
+#include "netutils.h"
+#include "utils.h"
+
+#ifdef HAVE_SSL_H
+#include <rsa.h>
+#include <crypto.h>
+#include <x509.h>
+#include <pem.h>
+#include <ssl.h>
+#include <err.h>
+#endif
+
+#ifdef HAVE_OPENSSL_SSL_H
+#include <openssl/rsa.h>
+#include <openssl/crypto.h>
+#include <openssl/x509.h>
+#include <openssl/pem.h>
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+#endif
+
+#ifdef HAVE_SSL
+SSL_CTX *ctx;
+SSL *ssl;
+int connect_SSL (void);
+#endif
+
+#define TCP_PROTOCOL 1
+#define UDP_PROTOCOL 2
+
+int process_arguments (int, char **);
+void print_usage (void);
+void print_help (void);
+
+char *PROGNAME = NULL;
+char *SERVICE = NULL;
+char *SEND = NULL;
+char *EXPECT = NULL;
+char *QUIT = NULL;
+int PROTOCOL = 0;
+int PORT = 0;
+
+int server_port = 0;
+char *server_address = NULL;
+char *server_send = NULL;
+char *server_quit = NULL;
+char **server_expect = NULL;
+int server_expect_count = 0;
+char **warn_codes = NULL;
+int warn_codes_count = 0;
+char **crit_codes = NULL;
+int crit_codes_count = 0;
+int delay = 0;
+int warning_time = 0;
+int check_warning_time = FALSE;
+int critical_time = 0;
+int check_critical_time = FALSE;
+int verbose = FALSE;
+int use_ssl = FALSE;
+int sd;
+
+int
+main (int argc, char **argv)
+{
+ int result;
+ int i;
+ char buffer[MAX_INPUT_BUFFER] = "";
+ char *status = NULL;
+ char *output = NULL;
+ char *ptr = NULL;
+
+ if (strstr (argv[0], "check_udp")) {
+ PROGNAME = strscpy (PROGNAME, "check_udp");
+ SERVICE = strscpy (SERVICE, "UDP");
+ SEND = NULL;
+ EXPECT = NULL;
+ QUIT = NULL;
+ PROTOCOL = UDP_PROTOCOL;
+ PORT = 0;
+ }
+ else if (strstr (argv[0], "check_tcp")) {
+ PROGNAME = strscpy (PROGNAME, "check_tcp");
+ SERVICE = strscpy (SERVICE, "TCP");
+ SEND = NULL;
+ EXPECT = NULL;
+ QUIT = NULL;
+ PROTOCOL = TCP_PROTOCOL;
+ PORT = 0;
+ }
+ else if (strstr (argv[0], "check_ftp")) {
+ PROGNAME = strscpy (PROGNAME, "check_ftp");
+ SERVICE = strscpy (SERVICE, "FTP");
+ SEND = NULL;
+ EXPECT = strscpy (EXPECT, "220");
+ QUIT = strscpy (QUIT, "QUIT\r\n");
+ PROTOCOL = TCP_PROTOCOL;
+ PORT = 21;
+ }
+ else if (strstr (argv[0], "check_smtp")) {
+ PROGNAME = strscpy (PROGNAME, "check_smtp");
+ SERVICE = strscpy (SERVICE, "SMTP");
+ SEND = NULL;
+ EXPECT = strscpy (EXPECT, "220");
+ QUIT = strscpy (QUIT, "QUIT\r\n");
+ PROTOCOL = TCP_PROTOCOL;
+ PORT = 25;
+ }
+ else if (strstr (argv[0], "check_pop")) {
+ PROGNAME = strscpy (PROGNAME, "check_pop");
+ SERVICE = strscpy (SERVICE, "POP");
+ SEND = NULL;
+ EXPECT = strscpy (EXPECT, "110");
+ QUIT = strscpy (QUIT, "QUIT\r\n");
+ PROTOCOL = TCP_PROTOCOL;
+ PORT = 110;
+ }
+ else if (strstr (argv[0], "check_imap")) {
+ PROGNAME = strscpy (PROGNAME, "check_imap");
+ SERVICE = strscpy (SERVICE, "IMAP");
+ SEND = NULL;
+ EXPECT = strscpy (EXPECT, "* OK");
+ QUIT = strscpy (QUIT, "a1 LOGOUT\r\n");
+ PROTOCOL = TCP_PROTOCOL;
+ PORT = 143;
+ }
+#ifdef HAVE_SSL
+ else if (strstr(argv[0],"check_simap")) {
+ PROGNAME=strscpy(PROGNAME,"check_simap");
+ SERVICE=strscpy(SERVICE,"SIMAP");
+ SEND=NULL;
+ EXPECT=strscpy(EXPECT,"* OK");
+ QUIT=strscpy(QUIT,"a1 LOGOUT\n");
+ PROTOCOL=TCP_PROTOCOL;
+ use_ssl=TRUE;
+ PORT=993;
+ }
+#endif
+ else if (strstr (argv[0], "check_nntp")) {
+ PROGNAME = strscpy (PROGNAME, "check_nntp");
+ SERVICE = strscpy (SERVICE, "NNTP");
+ SEND = NULL;
+ EXPECT = NULL;
+ server_expect = realloc (server_expect, ++server_expect_count);
+ server_expect[server_expect_count - 1] = strscpy (EXPECT, "200");
+ server_expect = realloc (server_expect, ++server_expect_count);
+ server_expect[server_expect_count - 1] = strscpy (NULL, "201");
+ QUIT = strscpy (QUIT, "QUIT\r\n");
+ PROTOCOL = TCP_PROTOCOL;
+ PORT = 119;
+ }
+ else {
+ usage ("ERROR: Generic check_tcp called with unknown service\n");
+ }
+
+ server_address = strscpy (NULL, "127.0.0.1");
+ server_port = PORT;
+ server_send = SEND;
+ server_quit = QUIT;
+
+ if (process_arguments (argc, argv) == ERROR)
+ usage ("Could not parse arguments\n");
+
+ /* use default expect if none listed in process_arguments() */
+ if (EXPECT && server_expect_count == 0) {
+ server_expect = malloc (1);
+ server_expect[server_expect_count - 1] = EXPECT;
+ }
+
+ /* initialize alarm signal handling */
+ signal (SIGALRM, socket_timeout_alarm_handler);
+
+ /* set socket timeout */
+ alarm (socket_timeout);
+
+ /* try to connect to the host at the given port number */
+ time (&start_time);
+#ifdef HAVE_SSL
+ if (use_ssl)
+ result = connect_SSL ();
+ else
+#endif
+ {
+ if (PROTOCOL == UDP_PROTOCOL)
+ result = my_udp_connect (server_address, server_port, &sd);
+ else /* default is TCP */
+ result = my_tcp_connect (server_address, server_port, &sd);
+ }
+
+ if (result == STATE_CRITICAL)
+ return STATE_CRITICAL;
+
+ if (server_send != NULL) { /* Something to send? */
+ snprintf (buffer, MAX_INPUT_BUFFER - 1, "%s\r\n", server_send);
+ buffer[MAX_INPUT_BUFFER - 1] = 0;
+#ifdef HAVE_SSL
+ if (use_ssl)
+ SSL_write(ssl,buffer,strlen(buffer));
+ else
+#endif
+ send (sd, buffer, strlen (buffer), 0);
+ }
+
+ if (delay > 0) {
+ start_time = start_time + delay;
+ sleep (delay);
+ }
+
+ if (server_send || server_expect_count > 0) {
+
+ /* watch for the expect string */
+#ifdef HAVE_SSL
+ if (use_ssl && SSL_read (ssl, buffer, MAX_INPUT_BUFFER - 1)>=0)
+ status = strscat(status,buffer);
+ else
+#endif
+ {
+ if (recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0) >= 0)
+ status = strscat (status, buffer);
+ }
+ strip (status);
+
+ /* return a CRITICAL status if we couldn't read any data */
+ if (status == NULL)
+ terminate (STATE_CRITICAL, "No data received from host\n");
+
+ if (status && verbose)
+ printf ("%s\n", status);
+
+ if (server_expect_count > 0) {
+ for (i = 0;; i++) {
+ printf ("%d %d\n", i, server_expect_count);
+ if (i >= server_expect_count)
+ terminate (STATE_WARNING, "Invalid response from host\n");
+ if (strstr (status, server_expect[i]))
+ break;
+ }
+ }
+ }
+
+ if (server_quit)
+#ifdef HAVE_SSL
+ if (use_ssl) {
+ SSL_write (ssl, QUIT, strlen (QUIT));
+ SSL_shutdown (ssl);
+ SSL_free (ssl);
+ SSL_CTX_free (ctx);
+ }
+ else
+#endif
+ send (sd, server_quit, strlen (server_quit), 0);
+
+ /* close the connection */
+ close (sd);
+
+ time (&end_time);
+
+ if (check_critical_time == TRUE && (end_time - start_time) > critical_time)
+ result = STATE_CRITICAL;
+ else if (check_warning_time == TRUE
+ && (end_time - start_time) > warning_time) result = STATE_WARNING;
+
+ /* reset the alarm */
+ alarm (0);
+
+ printf
+ ("%s %s - %d second response time on port %d",
+ SERVICE,
+ state_text (result), (int) (end_time - start_time), server_port);
+
+ if (status)
+ printf (" [%s]\n", status);
+ else
+ printf ("\n");
+
+ return result;
+}
+
+
+
+
+
+
+
+/* process command-line arguments */
+int
+process_arguments (int argc, char **argv)
+{
+ int c;
+
+#ifdef HAVE_GETOPT_H
+ int option_index = 0;
+ static struct option long_options[] = {
+ {"hostname", required_argument, 0, 'H'},
+ {"critical-time", required_argument, 0, 'c'},
+ {"warning-time", required_argument, 0, 'w'},
+ {"critical-codes", required_argument, 0, 'C'},
+ {"warning-codes", required_argument, 0, 'W'},
+ {"timeout", required_argument, 0, 't'},
+ {"protocol", required_argument, 0, 'P'},
+ {"port", required_argument, 0, 'p'},
+ {"send", required_argument, 0, 's'},
+ {"expect", required_argument, 0, 'e'},
+ {"quit", required_argument, 0, 'q'},
+ {"delay", required_argument, 0, 'd'},
+ {"verbose", no_argument, 0, 'v'},
+ {"version", no_argument, 0, 'V'},
+ {"help", no_argument, 0, 'h'},
+ {0, 0, 0, 0}
+ };
+#endif
+
+ if (argc < 2)
+ usage ("No arguments found\n");
+
+ /* backwards compatibility */
+ for (c = 1; c < argc; c++) {
+ if (strcmp ("-to", argv[c]) == 0)
+ strcpy (argv[c], "-t");
+ else if (strcmp ("-wt", argv[c]) == 0)
+ strcpy (argv[c], "-w");
+ else if (strcmp ("-ct", argv[c]) == 0)
+ strcpy (argv[c], "-c");
+ }
+
+ if (!is_option (argv[1])) {
+ server_address = argv[1];
+ argv[1] = argv[0];
+ argv = &argv[1];
+ argc--;
+ }
+
+ while (1) {
+#ifdef HAVE_GETOPT_H
+ c =
+ getopt_long (argc, argv, "+hVvH:s:e:q:c:w:t:p:C:W:d:S", long_options,
+ &option_index);
+#else
+ c = getopt (argc, argv, "+hVvH:s:e:q:c:w:t:p:C:W:d:S");
+#endif
+
+ 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", my_basename (argv[0]), 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 'v': /* verbose mode */
+ verbose = TRUE;
+ break;
+ case 'H': /* hostname */
+ if (is_host (optarg) == FALSE)
+ usage ("Invalid host name/address\n");
+ server_address = optarg;
+ break;
+ case 'c': /* critical */
+ if (!is_intnonneg (optarg))
+ usage ("Critical threshold must be a nonnegative integer\n");
+ critical_time = atoi (optarg);
+ check_critical_time = TRUE;
+ break;
+ case 'w': /* warning */
+ if (!is_intnonneg (optarg))
+ usage ("Warning threshold must be a nonnegative integer\n");
+ warning_time = atoi (optarg);
+ check_warning_time = TRUE;
+ break;
+ case 'C':
+ crit_codes = realloc (crit_codes, ++crit_codes_count);
+ crit_codes[crit_codes_count - 1] = optarg;
+ break;
+ case 'W':
+ warn_codes = realloc (warn_codes, ++warn_codes_count);
+ warn_codes[warn_codes_count - 1] = optarg;
+ break;
+ case 't': /* timeout */
+ if (!is_intpos (optarg))
+ usage ("Timeout interval must be a positive integer\n");
+ socket_timeout = atoi (optarg);
+ break;
+ case 'p': /* port */
+ if (!is_intpos (optarg))
+ usage ("Server port must be a positive integer\n");
+ server_port = atoi (optarg);
+ break;
+ case 's':
+ server_send = optarg;
+ break;
+ case 'e':
+ EXPECT = NULL;
+ if (server_expect_count == 0)
+ server_expect = malloc (++server_expect_count);
+ else
+ server_expect = realloc (server_expect, ++server_expect_count);
+ server_expect[server_expect_count - 1] = optarg;
+ break;
+ case 'q':
+ server_quit = optarg;
+ break;
+ case 'd':
+ if (is_intpos (optarg))
+ delay = atoi (optarg);
+ else
+ usage ("Delay must be a positive integer\n");
+ break;
+ case 'S':
+#ifndef HAVE_SSL
+ terminate (STATE_UNKNOWN,
+ "SSL support not available. Install OpenSSL and recompile.");
+#endif
+ use_ssl = TRUE;
+ break;
+ }
+ }
+
+ if (server_address == NULL)
+ usage ("You must provide a server address\n");
+
+ return OK;
+}
+
+
+
+
+
+void
+print_usage (void)
+{
+ printf
+ ("Usage: %s -H host -p port [-w warn_time] [-c crit_time] [-s send]\n"
+ " [-e expect] [-W wait] [-t to_sec] [-v]\n", PROGNAME);
+}
+
+
+
+
+
+void
+print_help (void)
+{
+ print_revision (PROGNAME, "$Revision$");
+ printf
+ ("Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)\n\n"
+ "This plugin tests %s connections with the specified host.\n\n",
+ SERVICE);
+ print_usage ();
+ printf
+ ("Options:\n"
+ " -H, --hostname=ADDRESS\n"
+ " Host name argument for servers using host headers (use numeric\n"
+ " address if possible to bypass DNS lookup).\n"
+ " -p, --port=INTEGER\n"
+ " Port number\n"
+ " -s, --send=STRING\n"
+ " String to send to the server\n"
+ " -e, --expect=STRING\n"
+ " String to expect in server response"
+ " -W, --wait=INTEGER\n"
+ " Seconds to wait between sending string and polling for response\n"
+ " -w, --warning=INTEGER\n"
+ " Response time to result in warning status (seconds)\n"
+ " -c, --critical=INTEGER\n"
+ " Response time to result in critical status (seconds)\n"
+ " -t, --timeout=INTEGER\n"
+ " Seconds before connection times out (default: %d)\n"
+ " -v"
+ " Show details for command-line debugging (do not use with nagios server)\n"
+ " -h, --help\n"
+ " Print detailed help screen\n"
+ " -V, --version\n"
+ " Print version information\n", DEFAULT_SOCKET_TIMEOUT);
+}
+
+
+#ifdef HAVE_SSL
+int
+connect_SSL (void)
+{
+ SSL_METHOD *meth;
+
+ /* Initialize SSL context */
+ SSLeay_add_ssl_algorithms ();
+ meth = SSLv2_client_method ();
+ SSL_load_error_strings ();
+ if ((ctx = SSL_CTX_new (meth)) == NULL)
+ {
+ printf ("ERROR: Cannot create SSL context.\n");
+ return STATE_CRITICAL;
+ }
+
+ /* Initialize alarm signal handling */
+ signal (SIGALRM, socket_timeout_alarm_handler);
+
+ /* Set socket timeout */
+ alarm (socket_timeout);
+
+ /* Save start time */
+ time (&start_time);
+
+ /* Make TCP connection */
+ if (my_tcp_connect (server_address, server_port, &sd) == STATE_OK)
+ {
+ /* Do the SSL handshake */
+ if ((ssl = SSL_new (ctx)) != NULL)
+ {
+ SSL_set_fd (ssl, sd);
+ if (SSL_connect (ssl) != -1)
+ return OK;
+ ERR_print_errors_fp (stderr);
+ }
+ else
+ {
+ printf ("ERROR: Cannot initiate SSL handshake.\n");
+ }
+ SSL_free (ssl);
+ }
+
+ SSL_CTX_free (ctx);
+ close (sd);
+
+ return STATE_CRITICAL;
+}
+#endif
+
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