Code

scanf parsing fix for check_swap from tracker id 1123292. now use floor(3)
[nagiosplug.git] / plugins / check_tcp.c
index ed51e94ad560d62cdb60cf079bbd076186258228..ad8b0429009d40037f474d71f1daeae56e6a14d8 100644 (file)
@@ -21,7 +21,7 @@
 /* progname "check_tcp" changes depending on symlink called */
 char *progname;
 const char *revision = "$Revision$";
-const char *copyright = "1999-2003";
+const char *copyright = "1999-2004";
 const char *email = "nagiosplug-devel@lists.sourceforge.net";
 
 #include "common.h"
@@ -47,252 +47,217 @@ const char *email = "nagiosplug-devel@lists.sourceforge.net";
 #endif
 
 #ifdef HAVE_SSL
-int check_cert = FALSE;
-int days_till_exp;
-char *randbuff = "";
-SSL_CTX *ctx;
-SSL *ssl;
-X509 *server_cert;
-int connect_SSL (void);
-int check_certificate (X509 **);
+static int check_cert = FALSE;
+static int days_till_exp;
+static char *randbuff = "";
+static SSL_CTX *ctx;
+static SSL *ssl;
+static X509 *server_cert;
+static int connect_SSL (void);
+static int check_certificate (X509 **);
+# define my_recv(buf, len) ((flags & FLAG_SSL) ? SSL_read(ssl, buf, len) : read(sd, buf, len))
+#else
+# define my_recv(buf, len) read(sd, buf, len)
 #endif
 
-enum {
-       TCP_PROTOCOL = 1,
-       UDP_PROTOCOL = 2,
-       MAXBUF = 1024
-};
 
-int process_arguments (int, char **);
-int my_recv (void);
+/* int my_recv(char *, size_t); */
+static int process_arguments (int, char **);
 void print_help (void);
 void print_usage (void);
 
-char *SERVICE = NULL;
-char *SEND = NULL;
-char *EXPECT = NULL;
-char *QUIT = NULL;
-int PROTOCOL = 0;
-int PORT = 0;
-
-char timestamp[17] = "";
-int server_port = 0;
-char *server_address = NULL;
-char *server_send = NULL;
-char *server_quit = NULL;
-char **server_expect = NULL;
-size_t server_expect_count = 0;
-int maxbytes = 0;
-char **warn_codes = NULL;
-size_t warn_codes_count = 0;
-char **crit_codes = NULL;
-size_t crit_codes_count = 0;
-unsigned int delay = 0;
-double warning_time = 0;
-int check_warning_time = FALSE;
-double critical_time = 0;
-int check_critical_time = FALSE;
-int hide_output = FALSE;
-double elapsed_time = 0;
-long microsec;
-int verbose = FALSE;
-int use_ssl = FALSE;
-int sd = 0;
-char *buffer;
-
-
+#define EXPECT server_expect[0]
+static char *SERVICE = "TCP";
+static char *SEND = NULL;
+static char *QUIT = NULL;
+static int PROTOCOL = IPPROTO_TCP; /* most common is default */
+static int PORT = 0;
+
+static char timestamp[17] = "";
+static int server_port = 0;
+static char *server_address = NULL;
+static char *server_send = NULL;
+static char *server_quit = NULL;
+static char **server_expect;
+static size_t server_expect_count = 0;
+static size_t maxbytes = 0;
+static char **warn_codes = NULL;
+static size_t warn_codes_count = 0;
+static char **crit_codes = NULL;
+static size_t crit_codes_count = 0;
+static unsigned int delay = 0;
+static double warning_time = 0;
+static double critical_time = 0;
+static double elapsed_time = 0;
+static long microsec;
+static int sd = 0;
+#define MAXBUF 1024
+static char buffer[MAXBUF];
+static int expect_mismatch_state = STATE_WARNING;
+
+#define FLAG_SSL 0x01
+#define FLAG_VERBOSE 0x02
+#define FLAG_EXACT_MATCH 0x04
+#define FLAG_TIME_WARN 0x08
+#define FLAG_TIME_CRIT 0x10
+#define FLAG_HIDE_OUTPUT 0x20
+static size_t flags = FLAG_EXACT_MATCH;
 
 int
 main (int argc, char **argv)
 {
-       int result;
+       int result = STATE_UNKNOWN;
        int i;
-       char *status;
+       char *status = NULL;
        struct timeval tv;
+       size_t len, match = -1;
 
        setlocale (LC_ALL, "");
        bindtextdomain (PACKAGE, LOCALEDIR);
        textdomain (PACKAGE);
 
-       if (strstr (argv[0], "check_udp")) {
-               progname = strdup ("check_udp");
-               SERVICE = strdup ("UDP");
-               SEND = NULL;
-               EXPECT = NULL;
-               QUIT = NULL;
-               PROTOCOL = UDP_PROTOCOL;
-               PORT = 0;
+       /* determine program- and service-name quickly */
+       progname = strrchr(argv[0], '/');
+       if(progname != NULL) progname++;
+       else progname = argv[0];
+
+       len = strlen(progname);
+       if(len > 6 && !memcmp(progname, "check_", 6)) {
+               SERVICE = progname + 6;
+               for(i = 0; i < len - 6; i++)
+                       SERVICE[i] = toupper(SERVICE[i]);
        }
-       else if (strstr (argv[0], "check_tcp")) {
-               progname = strdup ("check_tcp");
-               SERVICE = strdup ("TCP");
-               SEND = NULL;
-               EXPECT = NULL;
-               QUIT = NULL;
-               PROTOCOL = TCP_PROTOCOL;
-               PORT = 0;
+
+       /* set up a resonable buffer at first (will be realloc()'ed if
+        * user specifies other options) */
+       server_expect = calloc(sizeof(char *), 2);
+
+       /* determine defaults for this service's protocol */
+       if (!strncmp(SERVICE, "UDP", 3)) {
+               PROTOCOL = IPPROTO_UDP;
        }
-       else if (strstr (argv[0], "check_ftp")) {
-               progname = strdup ("check_ftp");
-               SERVICE = strdup ("FTP");
-               SEND = NULL;
-               EXPECT = strdup ("220");
-               QUIT = strdup ("QUIT\r\n");
-               PROTOCOL = TCP_PROTOCOL;
+       else if (!strncmp(SERVICE, "FTP", 3)) {
+               EXPECT = "220";
+               QUIT = "QUIT\r\n";
                PORT = 21;
        }
-       else if (strstr (argv[0], "check_smtp")) {
-               progname = strdup ("check_smtp");
-               SERVICE = strdup ("SMTP");
-               SEND = NULL;
-               EXPECT = strdup ("220");
-               QUIT = strdup ("QUIT\r\n");
-               PROTOCOL = TCP_PROTOCOL;
-               PORT = 25;
-       }
-       else if (strstr (argv[0], "check_pop")) {
-               progname = strdup ("check_pop");
-               SERVICE = strdup ("POP");
-               SEND = NULL;
-               EXPECT = strdup ("+OK");
-               QUIT = strdup ("QUIT\r\n");
-               PROTOCOL = TCP_PROTOCOL;
+       else if (!strncmp(SERVICE, "POP", 3) || !strncmp(SERVICE, "POP3", 4)) {
+               EXPECT = "+OK";
+               QUIT = "QUIT\r\n";
                PORT = 110;
        }
-       else if (strstr (argv[0], "check_imap")) {
-               progname = strdup ("check_imap");
-               SERVICE = strdup ("IMAP");
-               SEND = NULL;
-               EXPECT = strdup ("* OK");
-               QUIT = strdup ("a1 LOGOUT\r\n");
-               PROTOCOL = TCP_PROTOCOL;
+       else if (!strncmp(SERVICE, "SMTP", 4)) {
+               EXPECT = "220";
+               QUIT = "QUIT\r\n";
+               PORT = 25;
+       }
+       else if (!strncmp(SERVICE, "IMAP", 4)) {
+               EXPECT = "* OK";
+               QUIT = "a1 LOGOUT\r\n";
                PORT = 143;
        }
 #ifdef HAVE_SSL
-       else if (strstr(argv[0],"check_simap")) {
-               progname = strdup ("check_simap");
-               SERVICE = strdup ("SIMAP");
-               SEND=NULL;
-               EXPECT = strdup ("* OK");
-               QUIT = strdup ("a1 LOGOUT\r\n");
-               PROTOCOL=TCP_PROTOCOL;
-               use_ssl=TRUE;
-               PORT=993;
+       else if (!strncmp(SERVICE, "SIMAP", 5)) {
+               EXPECT = "* OK";
+               QUIT = "a1 LOGOUT\r\n";
+               flags |= FLAG_SSL;
+               PORT = 993;
        }
-       else if (strstr(argv[0],"check_spop")) {
-               progname = strdup ("check_spop");
-               SERVICE = strdup ("SPOP");
-               SEND=NULL;
-               EXPECT = strdup ("+OK");
-               QUIT = strdup ("QUIT\r\n");
-               PROTOCOL=TCP_PROTOCOL;
-               use_ssl=TRUE;
-               PORT=995;
+       else if (!strncmp(SERVICE, "SPOP", 4)) {
+               EXPECT = "+OK";
+               QUIT = "QUIT\r\n";
+               flags |= FLAG_SSL;
+               PORT = 995;
        }
-       else if (strstr(argv[0],"check_jabber")) {
-               progname = strdup("check_jabber");
-               SERVICE = strdup("JABBER");
-               SEND = strdup("<stream:stream to=\'host\' xmlns=\'jabber:client\' xmlns:stream=\'http://etherx.jabber.org/streams\'>\n");
-               EXPECT = strdup("<?xml version=\'1.0\'?><stream:stream xmlns:stream=\'http://etherx.jabber.org/streams\'");
-               QUIT = strdup("</stream:stream>\n");
-               PROTOCOL=TCP_PROTOCOL;
-               use_ssl=TRUE;
+       else if (!strncmp(SERVICE, "SSMTP", 5)) {
+               EXPECT = "220";
+               QUIT = "QUIT\r\n";
+               flags |= FLAG_SSL;
+               PORT = 465;
+       }
+       else if (!strncmp(SERVICE, "JABBER", 6)) {
+               SEND = "<stream:stream to=\'host\' xmlns=\'jabber:client\' xmlns:stream=\'http://etherx.jabber.org/streams\'>\n";
+               EXPECT = "<?xml version=\'1.0\'?><stream:stream xmlns:stream=\'http://etherx.jabber.org/streams\'";
+               QUIT = "</stream:stream>\n";
+               flags |= FLAG_SSL | FLAG_HIDE_OUTPUT;
                PORT = 5222;
        }
-       else if (strstr (argv[0], "check_nntps")) {
-               progname = strdup("check_nntps");
-               SERVICE = strdup("NNTPS");
-               SEND = NULL;
-               EXPECT = NULL;
-               server_expect = realloc (server_expect, ++server_expect_count);
-               asprintf (&server_expect[server_expect_count - 1], "200");
-               server_expect = realloc (server_expect, ++server_expect_count);
-               asprintf (&server_expect[server_expect_count - 1], "201");
-               QUIT = strdup("QUIT\r\n");
-               PROTOCOL = TCP_PROTOCOL;
-               use_ssl=TRUE;
+       else if (!strncmp (SERVICE, "NNTPS", 5)) {
+               server_expect_count = 2;
+               server_expect[0] = "200";
+               server_expect[1] = "201";
+               QUIT = "QUIT\r\n";
+               flags |= FLAG_SSL;
                PORT = 563;
-}
-
+       }
 #endif
-       else if (strstr (argv[0], "check_nntp")) {
-               progname = strdup ("check_nntp");
-               SERVICE = strdup ("NNTP");
-               SEND = NULL;
-               EXPECT = NULL;
-               server_expect = realloc (server_expect, sizeof (char *) * (++server_expect_count));
-               asprintf (&server_expect[server_expect_count - 1], "200");
-               server_expect = realloc (server_expect, sizeof (char *) * (++server_expect_count));
-               asprintf (&server_expect[server_expect_count - 1], "201");
-               asprintf (&QUIT, "QUIT\r\n");
-               PROTOCOL = TCP_PROTOCOL;
+       else if (!strncmp (SERVICE, "NNTP", 4)) {
+               server_expect_count = 2;
+               server_expect = malloc(sizeof(char *) * server_expect_count);
+               server_expect[0] = strdup("200");
+               server_expect[1] = strdup("201");
+               QUIT = "QUIT\r\n";
                PORT = 119;
        }
-       else {
-               progname = strdup ("check_tcp");
+       /* fallthrough check, so it's supposed to use reverse matching */
+       else if (strcmp (SERVICE, "TCP"))
                usage (_("CRITICAL - Generic check_tcp called with unknown service\n"));
-       }
 
-       server_address = strdup ("127.0.0.1");
+       server_address = "127.0.0.1";
        server_port = PORT;
        server_send = SEND;
        server_quit = QUIT;
-       status = strdup ("");
+       status = NULL;
 
-       if (process_arguments (argc, argv) != TRUE)
-               usage (_("check_tcp: could not parse arguments\n"));
+       if (process_arguments (argc, argv) == ERROR)
+               usage4 (_("Could not parse arguments"));
 
-       /* use default expect if none listed in process_arguments() */
-       if (EXPECT && server_expect_count == 0) {
-               server_expect = malloc (sizeof (char *) * (++server_expect_count));
-               server_expect[server_expect_count - 1] = EXPECT;
+       if(flags & FLAG_VERBOSE) {
+               printf("Using service %s\n", SERVICE);
+               printf("Port: %d\n", PORT);
+               printf("flags: 0x%x\n", flags);
        }
 
-       /* initialize alarm signal handling */
-       signal (SIGALRM, socket_timeout_alarm_handler);
+       if(EXPECT && !server_expect_count)
+               server_expect_count++;
 
-       /* set socket timeout */
+       /* set up the timer */
+       signal (SIGALRM, socket_timeout_alarm_handler);
        alarm (socket_timeout);
 
        /* try to connect to the host at the given port number */
        gettimeofday (&tv, NULL);
 #ifdef HAVE_SSL
-       if (use_ssl && check_cert == TRUE) {
-         if (connect_SSL () != OK)
-           die (STATE_CRITICAL,"CRITICAL - Could not make SSL connection\n");
-         if ((server_cert = SSL_get_peer_certificate (ssl)) != NULL) {
-           result = check_certificate (&server_cert);
-           X509_free(server_cert);
-         }
-         else {
-           printf("CRITICAL Cannot retrieve server certificate.\n");
-           result = STATE_CRITICAL;
-         }
-         SSL_shutdown (ssl);
-         SSL_free (ssl);
-         SSL_CTX_free (ctx);
-         close (sd);
-         return result;
+       if (flags & FLAG_SSL && check_cert == TRUE) {
+               if (connect_SSL () != OK)
+                       die (STATE_CRITICAL,_("CRITICAL - Could not make SSL connection\n"));
+               if ((server_cert = SSL_get_peer_certificate (ssl)) != NULL) {
+                       result = check_certificate (&server_cert);
+                       X509_free(server_cert);
+               }
+               else {
+                       printf(_("CRITICAL - Cannot retrieve server certificate.\n"));
+                       result = STATE_CRITICAL;
+               }
+
+               SSL_shutdown (ssl);
+               SSL_free (ssl);
+               SSL_CTX_free (ctx);
+               close (sd);
+               return result;
        }
-       else if (use_ssl)
+       else if (flags & FLAG_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);
-               }
+               result = np_net_connect (server_address, server_port, &sd, PROTOCOL);
 
        if (result == STATE_CRITICAL)
                return STATE_CRITICAL;
 
        if (server_send != NULL) {              /* Something to send? */
-               asprintf (&server_send, "%s\r\n", server_send);
 #ifdef HAVE_SSL
-               if (use_ssl)
+               if (flags & FLAG_SSL)
                        SSL_write(ssl, server_send, (int)strlen(server_send));
                else
 #endif
@@ -304,55 +269,71 @@ main (int argc, char **argv)
                sleep (delay);
        }
 
-       if (server_send || server_expect_count > 0) {
+       if(flags & FLAG_VERBOSE) {
+               printf("server_expect_count: %d\n", server_expect_count);
+               for(i = 0; i < server_expect_count; i++)
+                       printf("\t%d: %s\n", i, server_expect[i]);
+       }
+
+       /* if(len) later on, we know we have a non-NULL response */
+       len = 0;
+       if (server_expect_count) {
 
-               buffer = malloc (MAXBUF);
-               memset (buffer, '\0', MAXBUF);
                /* watch for the expect string */
-               while ((i = my_recv ()) > 0) {
-                       buffer[i] = '\0';
-                       asprintf (&status, "%s%s", status, buffer);
-                       if (buffer[i-2] == '\r' && buffer[i-1] == '\n')
+               while ((i = my_recv(buffer, sizeof(buffer))) > 0) {
+                       status = realloc(status, len + i + 1);
+                       memcpy(&status[len], buffer, i);
+                       len += i;
+
+                       /* stop reading if user-forced or data-starved */
+                       if(i < sizeof(buffer) || (maxbytes && len >= maxbytes))
                                break;
-                       if (maxbytes>0 && strlen(status) >= (unsigned)maxbytes)
+
+                       if (maxbytes && len >= maxbytes)
                                break;
                }
 
-               /* return a CRITICAL status if we couldn't read any data */
-               if (strlen(status) == 0)
+               /* no data when expected, so return critical */
+               if (len == 0)
                        die (STATE_CRITICAL, _("No data received from host\n"));
 
-               strip (status);
-
-               if (status && verbose)
-                       printf ("%s\n", status);
-
-               if (server_expect_count > 0) {
-                       for (i = 0;; i++) {
-                               if (verbose)
-                                       printf ("%d %d\n", i, (int)server_expect_count);
-                               if (i >= (int)server_expect_count)
-                                       die (STATE_WARNING, _("Invalid response from host\n"));
-                               if (strstr (status, server_expect[i]))
-                                       break;
+               /* force null-termination and strip whitespace from end of output */
+               status[len--] = '\0';
+               /* print raw output if we're debugging */
+               if(flags & FLAG_VERBOSE)
+                       printf("received %d bytes from host\n#-raw-recv-------#\n%s\n#-raw-recv-------#\n",
+                              len + 1, status);
+               while(isspace(status[len])) status[len--] = '\0';
+
+               for (i = 0; i < server_expect_count; i++) {
+                       match = -2;             /* tag it so we know if we tried and failed */
+                       if (flags & FLAG_VERBOSE)
+                               printf ("looking for [%s] %s [%s]\n", server_expect[i],
+                                       (flags & FLAG_EXACT_MATCH) ? "in beginning of" : "anywhere in",
+                                       status);
+
+                       /* match it. math first in short-circuit */
+                       if ((flags & FLAG_EXACT_MATCH && !strncmp(status, server_expect[i], strlen(server_expect[i]))) ||
+                           (!(flags & FLAG_EXACT_MATCH) && strstr(status, server_expect[i])))
+                       {
+                               if(flags & FLAG_VERBOSE) puts("found it");
+                               match = i;
+                               break;
                        }
                }
        }
 
        if (server_quit != NULL) {
 #ifdef HAVE_SSL
-               if (use_ssl) {
+               if (flags & FLAG_SSL) {
                        SSL_write (ssl, server_quit, (int)strlen(server_quit));
                        SSL_shutdown (ssl);
                        SSL_free (ssl);
                        SSL_CTX_free (ctx);
                }
-               else {
+               else
 #endif
                        send (sd, server_quit, strlen (server_quit), 0);
-#ifdef HAVE_SSL
-               }
-#endif
        }
 
        /* close the connection */
@@ -362,37 +343,53 @@ main (int argc, char **argv)
        microsec = deltime (tv);
        elapsed_time = (double)microsec / 1.0e6;
 
-       if (check_critical_time == TRUE && elapsed_time > critical_time)
+       if (flags & FLAG_TIME_CRIT && elapsed_time > critical_time)
                result = STATE_CRITICAL;
-       else if (check_warning_time == TRUE && elapsed_time > warning_time)
+       else if (flags & FLAG_TIME_WARN && elapsed_time > warning_time)
+               result = STATE_WARNING;
+
+       /* did we get the response we hoped? */
+       if(match == -2 && result != STATE_CRITICAL)
                result = STATE_WARNING;
 
        /* reset the alarm */
        alarm (0);
 
-       printf
-               (_("%s %s%s - %.3f second response time on port %d"),
-                SERVICE,
-                state_text (result),
-                (was_refused) ? " (refused)" : "",
-                elapsed_time, server_port);
+       /* this is a bit stupid, because we don't want to print the
+        * response time (which can look ok to the user) if we didn't get
+        * the response we were looking for. if-else */
+       printf(_("%s %s - "), SERVICE, state_text(result));
 
-       if (hide_output == FALSE && status && strlen(status) > 0)
-               printf (" [%s]", status);
+       if(match == -2 && len && !(flags & FLAG_HIDE_OUTPUT))
+               printf("Unexpected response from host: %s", status);
+       else
+               printf("%.3f second response time on port %d",
+                      elapsed_time, server_port);
 
-       printf (" |%s\n", fperfdata ("time", elapsed_time, "s",
-               TRUE, warning_time,
-               TRUE, critical_time,
-               TRUE, 0,
-               TRUE, socket_timeout));
+       if (match != -2 && !(flags & FLAG_HIDE_OUTPUT) && len)
+               printf (" [%s]", status);
 
+       /* perf-data doesn't apply when server doesn't talk properly,
+        * so print all zeroes on warn and crit */
+       if(match == -2)
+               printf ("|time=%fs;0.0;0.0;0.0;0.0", elapsed_time);
+       else
+               printf("|%s",
+                               fperfdata ("time", elapsed_time, "s",
+                                  TRUE, warning_time,
+                                  TRUE, critical_time,
+                                  TRUE, 0,
+                                  TRUE, socket_timeout)
+                     );
+
+       putchar('\n');
        return result;
 }
 
 
 
 /* process command-line arguments */
-int
+static int
 process_arguments (int argc, char **argv)
 {
        int c;
@@ -414,6 +411,7 @@ process_arguments (int argc, char **argv)
                {"jail", required_argument, 0, 'j'},
                {"delay", required_argument, 0, 'd'},
                {"refuse", required_argument, 0, 'r'},
+               {"mismatch", required_argument, 0, 'M'},
                {"use-ipv4", no_argument, 0, '4'},
                {"use-ipv6", no_argument, 0, '6'},
                {"verbose", no_argument, 0, 'v'},
@@ -427,7 +425,7 @@ process_arguments (int argc, char **argv)
        };
 
        if (argc < 2)
-               usage ("No arguments found\n");
+               usage4 (_("No arguments found"));
 
        /* backwards compatibility */
        for (c = 1; c < argc; c++) {
@@ -447,7 +445,7 @@ process_arguments (int argc, char **argv)
        }
 
        while (1) {
-               c = getopt_long (argc, argv, "+hVv46H:s:e:q:m:c:w:t:p:C:W:d:Sr:j",
+               c = getopt_long (argc, argv, "+hVv46H:s:e:q:m:c:w:t:p:C:W:d:Sr:jD:M:",
                                 longopts, &option);
 
                if (c == -1 || c == EOF || c == 1)
@@ -455,17 +453,15 @@ process_arguments (int argc, char **argv)
 
                switch (c) {
                case '?':                 /* print short usage statement if args not parsable */
-                       printf (_("%s: Unknown argument: %s\n\n"), progname, optarg);
-                       print_usage ();
-                       exit (STATE_UNKNOWN);
+                       usage2 (_("Unknown argument"), optarg);
                case 'h':                 /* help */
                        print_help ();
                        exit (STATE_OK);
                case 'V':                 /* version */
-                       print_revision (progname, "$Revision$");
+                       print_revision (progname, revision);
                        exit (STATE_OK);
                case 'v':                 /* verbose mode */
-                       verbose = TRUE;
+                       flags |= FLAG_VERBOSE;
                        break;
                case '4':
                        address_family = AF_INET;
@@ -474,30 +470,30 @@ process_arguments (int argc, char **argv)
 #ifdef USE_IPV6
                        address_family = AF_INET6;
 #else
-                       usage (_("IPv6 support not available\n"));
+                       usage4 (_("IPv6 support not available"));
 #endif
                        break;
                case 'H':                 /* hostname */
                        if (is_host (optarg) == FALSE)
-                               usage2 (_("invalid hostname/address"), optarg);
+                               usage2 (_("Invalid hostname/address"), optarg);
                        server_address = optarg;
                        break;
                case 'c':                 /* critical */
                        if (!is_intnonneg (optarg))
-                               usage (_("Critical threshold must be a positive integer\n"));
+                               usage4 (_("Critical threshold must be a positive integer"));
                        else
                                critical_time = strtod (optarg, NULL);
-                       check_critical_time = TRUE;
+                       flags |= FLAG_TIME_CRIT;
                        break;
                case 'j':                 /* hide output */
-                       hide_output = TRUE;
+                       flags |= FLAG_HIDE_OUTPUT;
                        break;
                case 'w':                 /* warning */
                        if (!is_intnonneg (optarg))
-                               usage (_("Warning threshold must be a positive integer\n"));
+                               usage4 (_("Warning threshold must be a positive integer"));
                        else
                                warning_time = strtod (optarg, NULL);
-                       check_warning_time = TRUE;
+                       flags |= FLAG_TIME_WARN;
                        break;
                case 'C':
                        crit_codes = realloc (crit_codes, ++crit_codes_count);
@@ -509,13 +505,13 @@ process_arguments (int argc, char **argv)
                        break;
                case 't':                 /* timeout */
                        if (!is_intpos (optarg))
-                               usage (_("Timeout interval must be a positive integer\n"));
+                               usage4 (_("Timeout interval must be a positive integer"));
                        else
                                socket_timeout = atoi (optarg);
                        break;
                case 'p':                 /* port */
                        if (!is_intpos (optarg))
-                               usage (_("Port must be a positive integer\n"));
+                               usage4 (_("Port must be a positive integer"));
                        else
                                server_port = atoi (optarg);
                        break;
@@ -524,6 +520,7 @@ process_arguments (int argc, char **argv)
                        break;
                case 'e': /* expect string (may be repeated) */
                        EXPECT = NULL;
+                       flags &= ~FLAG_EXACT_MATCH;
                        if (server_expect_count == 0)
                                server_expect = malloc (sizeof (char *) * (++server_expect_count));
                        else
@@ -532,9 +529,9 @@ process_arguments (int argc, char **argv)
                        break;
                case 'm':
                        if (!is_intpos (optarg))
-                               usage (_("Maxbytes must be a positive integer\n"));
+                               usage4 (_("Maxbytes must be a positive integer"));
                        else
-                               maxbytes = atoi (optarg);
+                               maxbytes = strtol (optarg, NULL, 0);
                case 'q':
                        asprintf(&server_quit, "%s\r\n", optarg);
                        break;
@@ -546,41 +543,54 @@ process_arguments (int argc, char **argv)
                        else if (!strncmp(optarg,"crit",4))
                                econn_refuse_state = STATE_CRITICAL;
                        else
-                               usage (_("Refuse must be one of ok, warn, crit\n"));
+                               usage4 (_("Refuse must be one of ok, warn, crit"));
+                       break;
+               case 'M':
+                       if (!strncmp(optarg,"ok",2))
+                               expect_mismatch_state = STATE_OK;
+                       else if (!strncmp(optarg,"warn",4))
+                               expect_mismatch_state = STATE_WARNING;
+                       else if (!strncmp(optarg,"crit",4))
+                               expect_mismatch_state = STATE_CRITICAL;
+                       else
+                               usage4 (_("Mismatch must be one of ok, warn, crit"));
                        break;
                case 'd':
                        if (is_intpos (optarg))
                                delay = atoi (optarg);
                        else
-                               usage (_("Delay must be a positive integer\n"));
+                               usage4 (_("Delay must be a positive integer"));
                        break;
-                 case 'D': /* Check SSL cert validity - days 'til certificate expiration */
+               case 'D': /* Check SSL cert validity - days 'til certificate expiration */
 #ifdef HAVE_SSL
                        if (!is_intnonneg (optarg))
-                               usage2 ("invalid certificate expiration period", optarg);
+                               usage2 (_("Invalid certificate expiration period"), optarg);
                        days_till_exp = atoi (optarg);
                        check_cert = TRUE;
-                       use_ssl = TRUE;
+                       flags |= FLAG_SSL;
                        break;
+#endif
+                       /* fallthrough if we don't have ssl */
                case 'S':
-                       use_ssl = TRUE;
+#ifdef HAVE_SSL
+                       flags |= FLAG_SSL;
 #else
-                       die (STATE_UNKNOWN, "SSL support not available.  Install OpenSSL and recompile.");
+                       die (STATE_UNKNOWN, _("Invalid option - SSL is not available"));
 #endif
                        break;
                }
        }
 
        if (server_address == NULL)
-               usage (_("You must provide a server address\n"));
+               usage4 (_("You must provide a server address"));
 
-       return OK;
+       return TRUE;
 }
 
 
-
+/* SSL-specific functions */
 #ifdef HAVE_SSL
-int
+static int
 connect_SSL (void)
 {
   SSL_METHOD *meth;
@@ -631,12 +641,8 @@ connect_SSL (void)
 
   return STATE_CRITICAL;
 }
-#endif
-
 
-
-#ifdef HAVE_SSL
-int
+static int
 check_certificate (X509 ** certificate)
 {
   ASN1_STRING *tm;
@@ -651,7 +657,7 @@ check_certificate (X509 ** certificate)
   /* Generate tm structure to process timestamp */
   if (tm->type == V_ASN1_UTCTIME) {
     if (tm->length < 10) {
-      printf ("CRITICAL - Wrong time format in certificate.\n");
+      printf (_("CRITICAL - Wrong time format in certificate.\n"));
       return STATE_CRITICAL;
     }
     else {
@@ -663,7 +669,7 @@ check_certificate (X509 ** certificate)
   }
   else {
     if (tm->length < 12) {
-      printf ("CRITICAL - Wrong time format in certificate.\n");
+      printf (_("CRITICAL - Wrong time format in certificate.\n"));
       return STATE_CRITICAL;
     }
     else {
@@ -692,46 +698,24 @@ check_certificate (X509 ** certificate)
           stamp.tm_mday, stamp.tm_year + 1900, stamp.tm_hour, stamp.tm_min);
 
         if (days_left > 0 && days_left <= days_till_exp) {
-         printf ("Certificate expires in %d day(s) (%s).\n", days_left, timestamp);
+         printf (_("Certificate expires in %d day(s) (%s).\n"), days_left, timestamp);
          return STATE_WARNING;
         }
         if (days_left < 0) {
-         printf ("Certificate expired on %s.\n", timestamp);
+         printf (_("Certificate expired on %s.\n"), timestamp);
          return STATE_CRITICAL;
         }
 
         if (days_left == 0) {
-         printf ("Certificate expires today (%s).\n", timestamp);
+         printf (_("Certificate expires today (%s).\n"), timestamp);
          return STATE_WARNING;
         }
 
-        printf ("Certificate will expire on %s.\n", timestamp);
+        printf (_("Certificate will expire on %s.\n"), timestamp);
 
         return STATE_OK;
 }
-#endif
-
-
-
-int
-my_recv (void)
-{
-       int i;
-
-#ifdef HAVE_SSL
-       if (use_ssl) {
-               i = SSL_read (ssl, buffer, MAXBUF - 1);
-       }
-       else {
-#endif
-               i = read (sd, buffer, MAXBUF - 1);
-#ifdef HAVE_SSL
-       }
-#endif
-
-       return i;
-}
-
+#endif /* HAVE_SSL */
 
 
 void
@@ -739,8 +723,8 @@ print_help (void)
 {
        print_revision (progname, revision);
 
-       printf (_("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n"));
-       printf (_(COPYRIGHT), copyright, email);
+       printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
+       printf (COPYRIGHT, copyright, email);
 
        printf (_("This plugin tests %s connections with the specified host.\n\n"),
                SERVICE);
@@ -764,6 +748,8 @@ print_help (void)
        printf (_("\
  -r, --refuse=ok|warn|crit\n\
     Accept tcp refusals with states ok, warn, crit (default: crit)\n\
+ -M, --mismatch=ok|warn|crit\n\
+    Accept expected string mismatches with states ok, warn, crit (default: warn)\n\
  -j, --jail\n\
     Hide output from TCP socket\n\
  -m, --maxbytes=INTEGER\n\
@@ -789,16 +775,14 @@ print_help (void)
 }
 
 
-
 void
 print_usage (void)
 {
-       printf (_("\
+       printf ("\
 Usage: %s -H host -p port [-w <warning time>] [-c <critical time>]\n\
-  [-s <send string>] [-e <expect string>] [-q <quit string>]\n\
-  [-m <maximum bytes>] [-d <delay>] [-t <timeout seconds>]\n\
-  [-r <refuse state>] [-v] [-4|-6] [-j] [-D <days to cert expiry>]\n\
-  [-S <use SSL>]\n"), progname);
-       printf ("       %s (-h|--help)\n", progname);
-       printf ("       %s (-V|--version)\n", progname);
+                  [-s <send string>] [-e <expect string>] [-q <quit string>]\n\
+                  [-m <maximum bytes>] [-d <delay>] [-t <timeout seconds>]\n\
+                  [-r <refuse state>] [-M <mismatch state>] [-v] [-4|-6] [-j]\n\
+                  [-D <days to cert expiry>] [-S <use SSL>]\n", progname);
 }
+