Code

Added -A/--dig-arguments to check_dig (#1889453/#1874041)
[nagiosplug.git] / plugins / check_tcp.c
1 /*****************************************************************************
2
3 * Nagios check_tcp plugin
4
5 * License: GPL
6 * Copyright (c) 1999-2008 Nagios Plugins Development Team
7
8 * Last Modified: $Date$
9
10 * Description:
11
12 * This file contains the check_tcp plugin
13
14
15 * This program is free software: you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation, either version 3 of the License, or
18 * (at your option) any later version.
19
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
23 * GNU General Public License for more details.
24
25 * You should have received a copy of the GNU General Public License
26 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
27 *  
28 * $Id$
29
30 *****************************************************************************/
32 /* progname "check_tcp" changes depending on symlink called */
33 char *progname;
34 const char *revision = "$Revision$";
35 const char *copyright = "1999-2008";
36 const char *email = "nagiosplug-devel@lists.sourceforge.net";
38 #include "common.h"
39 #include "netutils.h"
40 #include "utils.h"
41 #include "utils_tcp.h"
43 #ifdef HAVE_SSL
44 static int check_cert = FALSE;
45 static int days_till_exp;
46 # define my_recv(buf, len) ((flags & FLAG_SSL) ? np_net_ssl_read(buf, len) : read(sd, buf, len))
47 # define my_send(buf, len) ((flags & FLAG_SSL) ? np_net_ssl_write(buf, len) : send(sd, buf, len, 0))
48 #else
49 # define my_recv(buf, len) read(sd, buf, len)
50 # define my_send(buf, len) send(sd, buf, len, 0)
51 #endif
53 /* int my_recv(char *, size_t); */
54 static int process_arguments (int, char **);
55 void print_help (void);
56 void print_usage (void);
58 #define EXPECT server_expect[0]
59 static char *SERVICE = "TCP";
60 static char *SEND = NULL;
61 static char *QUIT = NULL;
62 static int PROTOCOL = IPPROTO_TCP; /* most common is default */
63 static int PORT = 0;
65 static int server_port = 0;
66 static char *server_address = NULL;
67 static char *server_send = NULL;
68 static char *server_quit = NULL;
69 static char **server_expect;
70 static size_t server_expect_count = 0;
71 static size_t maxbytes = 0;
72 static char **warn_codes = NULL;
73 static size_t warn_codes_count = 0;
74 static char **crit_codes = NULL;
75 static size_t crit_codes_count = 0;
76 static unsigned int delay = 0;
77 static double warning_time = 0;
78 static double critical_time = 0;
79 static double elapsed_time = 0;
80 static long microsec;
81 static int sd = 0;
82 #define MAXBUF 1024
83 static char buffer[MAXBUF];
84 static int expect_mismatch_state = STATE_WARNING;
86 #define FLAG_SSL 0x01
87 #define FLAG_VERBOSE 0x02
88 #define FLAG_EXACT_MATCH 0x04
89 #define FLAG_TIME_WARN 0x08
90 #define FLAG_TIME_CRIT 0x10
91 #define FLAG_HIDE_OUTPUT 0x20
92 #define FLAG_MATCH_ALL 0x40
93 static size_t flags = FLAG_EXACT_MATCH;
95 int
96 main (int argc, char **argv)
97 {
98         int result = STATE_UNKNOWN;
99         int i;
100         char *status = NULL;
101         struct timeval tv;
102         size_t len;
103         int match = -1;
105         setlocale (LC_ALL, "");
106         bindtextdomain (PACKAGE, LOCALEDIR);
107         textdomain (PACKAGE);
109         /* determine program- and service-name quickly */
110         progname = strrchr(argv[0], '/');
111         if(progname != NULL) progname++;
112         else progname = argv[0];
114         len = strlen(progname);
115         if(len > 6 && !memcmp(progname, "check_", 6)) {
116                 SERVICE = strdup(progname + 6);
117                 for(i = 0; i < len - 6; i++)
118                         SERVICE[i] = toupper(SERVICE[i]);
119         }
121         /* set up a resonable buffer at first (will be realloc()'ed if
122          * user specifies other options) */
123         server_expect = calloc(sizeof(char *), 2);
125         /* determine defaults for this service's protocol */
126         if (!strncmp(SERVICE, "UDP", 3)) {
127                 PROTOCOL = IPPROTO_UDP;
128         }
129         else if (!strncmp(SERVICE, "FTP", 3)) {
130                 EXPECT = "220";
131                 QUIT = "QUIT\r\n";
132                 PORT = 21;
133         }
134         else if (!strncmp(SERVICE, "POP", 3) || !strncmp(SERVICE, "POP3", 4)) {
135                 EXPECT = "+OK";
136                 QUIT = "QUIT\r\n";
137                 PORT = 110;
138         }
139         else if (!strncmp(SERVICE, "SMTP", 4)) {
140                 EXPECT = "220";
141                 QUIT = "QUIT\r\n";
142                 PORT = 25;
143         }
144         else if (!strncmp(SERVICE, "IMAP", 4)) {
145                 EXPECT = "* OK";
146                 QUIT = "a1 LOGOUT\r\n";
147                 PORT = 143;
148         }
149 #ifdef HAVE_SSL
150         else if (!strncmp(SERVICE, "SIMAP", 5)) {
151                 EXPECT = "* OK";
152                 QUIT = "a1 LOGOUT\r\n";
153                 flags |= FLAG_SSL;
154                 PORT = 993;
155         }
156         else if (!strncmp(SERVICE, "SPOP", 4)) {
157                 EXPECT = "+OK";
158                 QUIT = "QUIT\r\n";
159                 flags |= FLAG_SSL;
160                 PORT = 995;
161         }
162         else if (!strncmp(SERVICE, "SSMTP", 5)) {
163                 EXPECT = "220";
164                 QUIT = "QUIT\r\n";
165                 flags |= FLAG_SSL;
166                 PORT = 465;
167         }
168         else if (!strncmp(SERVICE, "JABBER", 6)) {
169                 SEND = "<stream:stream to=\'host\' xmlns=\'jabber:client\' xmlns:stream=\'http://etherx.jabber.org/streams\'>\n";
170                 EXPECT = "<?xml version=\'1.0\'?><stream:stream xmlns=\'jabber:client\' xmlns:stream=\'http://etherx.jabber.org/streams\'";
171                 QUIT = "</stream:stream>\n";
172                 flags |= FLAG_HIDE_OUTPUT;
173                 PORT = 5222;
174         }
175         else if (!strncmp (SERVICE, "NNTPS", 5)) {
176                 server_expect_count = 2;
177                 server_expect[0] = "200";
178                 server_expect[1] = "201";
179                 QUIT = "QUIT\r\n";
180                 flags |= FLAG_SSL;
181                 PORT = 563;
182         }
183 #endif
184         else if (!strncmp (SERVICE, "NNTP", 4)) {
185                 server_expect_count = 2;
186                 server_expect = malloc(sizeof(char *) * server_expect_count);
187                 server_expect[0] = strdup("200");
188                 server_expect[1] = strdup("201");
189                 QUIT = "QUIT\r\n";
190                 PORT = 119;
191         }
192         else if (!strncmp(SERVICE, "CLAMD", 5)) {
193                 SEND = "PING";
194                 EXPECT = "PONG";
195                 QUIT = NULL;
196                 PORT = 3310;
197         }
198         /* fallthrough check, so it's supposed to use reverse matching */
199         else if (strcmp (SERVICE, "TCP"))
200                 usage (_("CRITICAL - Generic check_tcp called with unknown service\n"));
202         server_address = "127.0.0.1";
203         server_port = PORT;
204         server_send = SEND;
205         server_quit = QUIT;
206         status = NULL;
208         if (process_arguments (argc, argv) == ERROR)
209                 usage4 (_("Could not parse arguments"));
211         if(flags & FLAG_VERBOSE) {
212                 printf("Using service %s\n", SERVICE);
213                 printf("Port: %d\n", server_port);
214                 printf("flags: 0x%x\n", (int)flags);
215         }
217         if(EXPECT && !server_expect_count)
218                 server_expect_count++;
220         if(PROTOCOL==IPPROTO_UDP && !(server_expect_count && server_send)){
221                 usage(_("With UDP checks, a send/expect string must be specified."));
222         }
224         /* set up the timer */
225         signal (SIGALRM, socket_timeout_alarm_handler);
226         alarm (socket_timeout);
228         /* try to connect to the host at the given port number */
229         gettimeofday (&tv, NULL);
231         result = np_net_connect (server_address, server_port, &sd, PROTOCOL);
232         if (result == STATE_CRITICAL) return STATE_CRITICAL;
234 #ifdef HAVE_SSL
235         if (flags & FLAG_SSL){
236                 result = np_net_ssl_init(sd);
237                 if (result == STATE_OK && check_cert == TRUE) {
238                         result = np_net_ssl_check_cert(days_till_exp);
239                         if(result != STATE_OK) {
240                                 printf(_("CRITICAL - Cannot retrieve server certificate.\n"));
241                         }
242                 }
243         }
244         if(result != STATE_OK){
245                 np_net_ssl_cleanup();
246                 if(sd) close(sd);
247                 return result;
248         }
249 #endif /* HAVE_SSL */
251         if (server_send != NULL) {              /* Something to send? */
252                 my_send(server_send, strlen(server_send));
253         }
255         if (delay > 0) {
256                 tv.tv_sec += delay;
257                 sleep (delay);
258         }
260         if(flags & FLAG_VERBOSE) {
261                 if (server_send) {
262                         printf("Send string: %s\n", server_send);
263                 }
264                 if (server_quit) {
265                         printf("Quit string: %s\n", server_quit);
266                 }
267                 printf("server_expect_count: %d\n", (int)server_expect_count);
268                 for(i = 0; i < server_expect_count; i++)
269                         printf("\t%d: %s\n", i, server_expect[i]);
270         }
272         /* if(len) later on, we know we have a non-NULL response */
273         len = 0;
274         if (server_expect_count) {
276                 /* watch for the expect string */
277                 while ((i = my_recv(buffer, sizeof(buffer))) > 0) {
278                         status = realloc(status, len + i + 1);
279                         memcpy(&status[len], buffer, i);
280                         len += i;
282                         /* stop reading if user-forced or data-starved */
283                         if(i < sizeof(buffer) || (maxbytes && len >= maxbytes))
284                                 break;
286                         if (maxbytes && len >= maxbytes)
287                                 break;
288                 }
290                 /* no data when expected, so return critical */
291                 if (len == 0)
292                         die (STATE_CRITICAL, _("No data received from host\n"));
294                 /* force null-termination and strip whitespace from end of output */
295                 status[len--] = '\0';
296                 /* print raw output if we're debugging */
297                 if(flags & FLAG_VERBOSE)
298                         printf("received %d bytes from host\n#-raw-recv-------#\n%s\n#-raw-recv-------#\n",
299                                (int)len + 1, status);
300                 while(isspace(status[len])) status[len--] = '\0';
302                 match = np_expect_match(status,
303                                 server_expect,
304                                 server_expect_count,
305                                 (flags & FLAG_MATCH_ALL ? TRUE : FALSE),
306                                 (flags & FLAG_EXACT_MATCH ? TRUE : FALSE),
307                                 (flags & FLAG_VERBOSE ? TRUE : FALSE));
308         }
310         if (server_quit != NULL) {
311                 my_send(server_quit, strlen(server_quit));
312         }
313 #ifdef HAVE_SSL
314         np_net_ssl_cleanup();
315 #endif 
316         if (sd) close (sd);
318         microsec = deltime (tv);
319         elapsed_time = (double)microsec / 1.0e6;
321         if (flags & FLAG_TIME_CRIT && elapsed_time > critical_time)
322                 result = STATE_CRITICAL;
323         else if (flags & FLAG_TIME_WARN && elapsed_time > warning_time)
324                 result = STATE_WARNING;
326         /* did we get the response we hoped? */
327         if(match == FALSE && result != STATE_CRITICAL)
328                 result = expect_mismatch_state;
330         /* reset the alarm */
331         alarm (0);
333         /* this is a bit stupid, because we don't want to print the
334          * response time (which can look ok to the user) if we didn't get
335          * the response we were looking for. if-else */
336         printf("%s %s - ", SERVICE, state_text(result));
338         if(match == FALSE && len && !(flags & FLAG_HIDE_OUTPUT))
339                 printf("Unexpected response from host/socket: %s", status);
340         else {
341                 if(match == FALSE)
342                         printf("Unexpected response from host/socket on ");
343                 else
344                         printf("%.3f second response time on ", elapsed_time);
345                 if(server_address[0] != '/')
346                         printf("port %d", server_port);
347                 else
348                         printf("socket %s", server_address);
349         }
351         if (match != FALSE && !(flags & FLAG_HIDE_OUTPUT) && len)
352                 printf (" [%s]", status);
354         /* perf-data doesn't apply when server doesn't talk properly,
355          * so print all zeroes on warn and crit. Use fperfdata since
356          * localisation settings can make different outputs */
357         if(match == FALSE)
358                 printf ("|%s",
359                                 fperfdata ("time", elapsed_time, "s",
360                                 (flags & FLAG_TIME_WARN ? TRUE : FALSE), 0,
361                                 (flags & FLAG_TIME_CRIT ? TRUE : FALSE), 0,
362                                 TRUE, 0,
363                                 TRUE, socket_timeout)
364                         );
365         else
366                 printf("|%s",
367                                 fperfdata ("time", elapsed_time, "s",
368                                 (flags & FLAG_TIME_WARN ? TRUE : FALSE), warning_time,
369                                 (flags & FLAG_TIME_CRIT ? TRUE : FALSE), critical_time,
370                                 TRUE, 0,
371                                 TRUE, socket_timeout)
372                         );
374         putchar('\n');
375         return result;
380 /* process command-line arguments */
381 static int
382 process_arguments (int argc, char **argv)
384         int c;
385         int escape = 0;
387         int option = 0;
388         static struct option longopts[] = {
389                 {"hostname", required_argument, 0, 'H'},
390                 {"critical", required_argument, 0, 'c'},
391                 {"warning", required_argument, 0, 'w'},
392                 {"critical-codes", required_argument, 0, 'C'},
393                 {"warning-codes", required_argument, 0, 'W'},
394                 {"timeout", required_argument, 0, 't'},
395                 {"protocol", required_argument, 0, 'P'},
396                 {"port", required_argument, 0, 'p'},
397                 {"escape", required_argument, 0, 'E'},
398                 {"all", required_argument, 0, 'A'},
399                 {"send", required_argument, 0, 's'},
400                 {"expect", required_argument, 0, 'e'},
401                 {"maxbytes", required_argument, 0, 'm'},
402                 {"quit", required_argument, 0, 'q'},
403                 {"jail", no_argument, 0, 'j'},
404                 {"delay", required_argument, 0, 'd'},
405                 {"refuse", required_argument, 0, 'r'},
406                 {"mismatch", required_argument, 0, 'M'},
407                 {"use-ipv4", no_argument, 0, '4'},
408                 {"use-ipv6", no_argument, 0, '6'},
409                 {"verbose", no_argument, 0, 'v'},
410                 {"version", no_argument, 0, 'V'},
411                 {"help", no_argument, 0, 'h'},
412 #ifdef HAVE_SSL
413                 {"ssl", no_argument, 0, 'S'},
414                 {"certificate", required_argument, 0, 'D'},
415 #endif
416                 {0, 0, 0, 0}
417         };
419         if (argc < 2)
420                 usage4 (_("No arguments found"));
422         /* backwards compatibility */
423         for (c = 1; c < argc; c++) {
424                 if (strcmp ("-to", argv[c]) == 0)
425                         strcpy (argv[c], "-t");
426                 else if (strcmp ("-wt", argv[c]) == 0)
427                         strcpy (argv[c], "-w");
428                 else if (strcmp ("-ct", argv[c]) == 0)
429                         strcpy (argv[c], "-c");
430         }
432         if (!is_option (argv[1])) {
433                 server_address = argv[1];
434                 argv[1] = argv[0];
435                 argv = &argv[1];
436                 argc--;
437         }
439         while (1) {
440                 c = getopt_long (argc, argv, "+hVv46EAH:s:e:q:m:c:w:t:p:C:W:d:Sr:jD:M:",
441                                  longopts, &option);
443                 if (c == -1 || c == EOF || c == 1)
444                         break;
446                 switch (c) {
447                 case '?':                 /* print short usage statement if args not parsable */
448                         usage5 ();
449                 case 'h':                 /* help */
450                         print_help ();
451                         exit (STATE_OK);
452                 case 'V':                 /* version */
453                         print_revision (progname, revision);
454                         exit (STATE_OK);
455                 case 'v':                 /* verbose mode */
456                         flags |= FLAG_VERBOSE;
457                         break;
458                 case '4':
459                         address_family = AF_INET;
460                         break;
461                 case '6':
462 #ifdef USE_IPV6
463                         address_family = AF_INET6;
464 #else
465                         usage4 (_("IPv6 support not available"));
466 #endif
467                         break;
468                 case 'H':                 /* hostname */
469                         server_address = optarg;
470                         break;
471                 case 'c':                 /* critical */
472                         critical_time = strtod (optarg, NULL);
473                         flags |= FLAG_TIME_CRIT;
474                         break;
475                 case 'j':                 /* hide output */
476                         flags |= FLAG_HIDE_OUTPUT;
477                         break;
478                 case 'w':                 /* warning */
479                         warning_time = strtod (optarg, NULL);
480                         flags |= FLAG_TIME_WARN;
481                         break;
482                 case 'C':
483                         crit_codes = realloc (crit_codes, ++crit_codes_count);
484                         crit_codes[crit_codes_count - 1] = optarg;
485                         break;
486                 case 'W':
487                         warn_codes = realloc (warn_codes, ++warn_codes_count);
488                         warn_codes[warn_codes_count - 1] = optarg;
489                         break;
490                 case 't':                 /* timeout */
491                         if (!is_intpos (optarg))
492                                 usage4 (_("Timeout interval must be a positive integer"));
493                         else
494                                 socket_timeout = atoi (optarg);
495                         break;
496                 case 'p':                 /* port */
497                         if (!is_intpos (optarg))
498                                 usage4 (_("Port must be a positive integer"));
499                         else
500                                 server_port = atoi (optarg);
501                         break;
502                 case 'E':
503                         escape = 1;
504                         break;
505                 case 's':
506                         if (escape)
507                                 server_send = np_escaped_string(optarg);
508                         else
509                                 asprintf(&server_send, "%s", optarg);
510                         break;
511                 case 'e': /* expect string (may be repeated) */
512                         flags &= ~FLAG_EXACT_MATCH;
513                         if (server_expect_count == 0)
514                                 server_expect = malloc (sizeof (char *) * (++server_expect_count));
515                         else
516                                 server_expect = realloc (server_expect, sizeof (char *) * (++server_expect_count));
517                         server_expect[server_expect_count - 1] = optarg;
518                         break;
519                 case 'm':
520                         if (!is_intpos (optarg))
521                                 usage4 (_("Maxbytes must be a positive integer"));
522                         else
523                                 maxbytes = strtol (optarg, NULL, 0);
524                         break;
525                 case 'q':
526                         if (escape)
527                                 server_quit = np_escaped_string(optarg);
528                         else
529                                 asprintf(&server_quit, "%s\r\n", optarg);
530                         break;
531                 case 'r':
532                         if (!strncmp(optarg,"ok",2))
533                                 econn_refuse_state = STATE_OK;
534                         else if (!strncmp(optarg,"warn",4))
535                                 econn_refuse_state = STATE_WARNING;
536                         else if (!strncmp(optarg,"crit",4))
537                                 econn_refuse_state = STATE_CRITICAL;
538                         else
539                                 usage4 (_("Refuse must be one of ok, warn, crit"));
540                         break;
541                 case 'M':
542                         if (!strncmp(optarg,"ok",2))
543                                 expect_mismatch_state = STATE_OK;
544                         else if (!strncmp(optarg,"warn",4))
545                                 expect_mismatch_state = STATE_WARNING;
546                         else if (!strncmp(optarg,"crit",4))
547                                 expect_mismatch_state = STATE_CRITICAL;
548                         else
549                                 usage4 (_("Mismatch must be one of ok, warn, crit"));
550                         break;
551                 case 'd':
552                         if (is_intpos (optarg))
553                                 delay = atoi (optarg);
554                         else
555                                 usage4 (_("Delay must be a positive integer"));
556                         break;
557                 case 'D': /* Check SSL cert validity - days 'til certificate expiration */
558 #ifdef HAVE_SSL
559 #  ifdef USE_OPENSSL /* XXX */
560                         if (!is_intnonneg (optarg))
561                                 usage2 (_("Invalid certificate expiration period"), optarg);
562                         days_till_exp = atoi (optarg);
563                         check_cert = TRUE;
564                         flags |= FLAG_SSL;
565                         break;
566 #  endif /* USE_OPENSSL */
567 #endif
568                         /* fallthrough if we don't have ssl */
569                 case 'S':
570 #ifdef HAVE_SSL
571                         flags |= FLAG_SSL;
572 #else
573                         die (STATE_UNKNOWN, _("Invalid option - SSL is not available"));
574 #endif
575                         break;
576                 case 'A':
577                         flags |= FLAG_MATCH_ALL;
578                         break;
579                 }
580         }
582         if (server_address == NULL)
583                 usage4 (_("You must provide a server address"));
584         else if (server_address[0] != '/' && is_host (server_address) == FALSE)
585                 die (STATE_CRITICAL, "%s %s - %s: %s\n", SERVICE, state_text(STATE_CRITICAL), _("Invalid hostname, address or socket"), server_address);
587         return TRUE;
591 void
592 print_help (void)
594         print_revision (progname, revision);
596         printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
597         printf (COPYRIGHT, copyright, email);
599         printf (_("This plugin tests %s connections with the specified host (or unix socket).\n\n"),
600                 SERVICE);
602         print_usage ();
604         printf (_(UT_HELP_VRSN));
606         printf (_(UT_HOST_PORT), 'p', "none");
608         printf (_(UT_IPv46));
610         printf (" %s\n", "-E, --escape");
611   printf ("    %s\n", _("Can use \\n, \\r, \\t or \\ in send or quit string. Must come before send or quit option"));
612   printf ("    %s\n", _("Default: nothing added to send, \\r\\n added to end of quit"));
613   printf (" %s\n", "-s, --send=STRING");
614   printf ("    %s\n", _("String to send to the server"));
615   printf (" %s\n", "-e, --expect=STRING");
616   printf ("    %s %s\n", _("String to expect in server response"), _("(may be repeated)"));
617   printf (" %s\n", "-A, --all");
618   printf ("    %s\n", _("All expect strings need to occur in server response. Default is any"));
619   printf (" %s\n", "-q, --quit=STRING");
620   printf ("    %s\n", _("String to send server to initiate a clean close of the connection"));
621   printf (" %s\n", "-r, --refuse=ok|warn|crit");
622   printf ("    %s\n", _("Accept tcp refusals with states ok, warn, crit (default: crit)"));
623   printf (" %s\n", "-M, --mismatch=ok|warn|crit");
624   printf ("    %s\n", _("Accept expected string mismatches with states ok, warn, crit (default: warn)"));
625   printf (" %s\n", "-j, --jail");
626   printf ("    %s\n", _("Hide output from TCP socket"));
627   printf (" %s\n", "-m, --maxbytes=INTEGER");
628   printf ("    %s\n", _("Close connection once more than this number of bytes are received"));
629   printf (" %s\n", "-d, --delay=INTEGER");
630   printf ("    %s\n", _("Seconds to wait between sending string and polling for response"));
632 #ifdef HAVE_SSL
633         printf (" %s\n", "-D, --certificate=INTEGER");
634   printf ("    %s\n", _("Minimum number of days a certificate has to be valid."));
635   printf (" %s\n", "-S, --ssl");
636   printf ("    %s\n", _("Use SSL for the connection."));
637 #endif
639         printf (_(UT_WARN_CRIT));
641         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
643         printf (_(UT_VERBOSE));
645         printf (_(UT_SUPPORT));
649 void
650 print_usage (void)
652         printf (_("Usage:"));
653   printf ("%s -H host -p port [-w <warning time>] [-c <critical time>] [-s <send string>]\n",progname);
654   printf ("[-e <expect string>] [-q <quit string>][-m <maximum bytes>] [-d <delay>]\n");
655   printf ("[-t <timeout seconds>] [-r <refuse state>] [-M <mismatch state>] [-v] [-4|-6] [-j]\n");
656   printf ("[-D <days to cert expiry>] [-S <use SSL>] [-E]\n");