1 files changed, 563 insertions, 0 deletions

diff --git a/plugins/check_tcp.c b/plugins/check_tcp.c
new file mode 100644
index 00000000..bef0e752
--- /dev/null
+++ b/plugins/check_tcp.c
@@ -0,0 +1,563 @@
+/******************************************************************************
+ *
+ * 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
+