Code

Moved check_tcp's expect string testing into utils_tcp for testing purposes.
[nagiosplug.git] / plugins / check_tcp.c
1 /*****************************************************************************
2 *
3 * Nagios check_tcp plugin
4 *
5 * License: GPL
6 * Copyright (c) 1999-2006 nagios-plugins team
7 *
8 * Last Modified: $Date$
9 *
10 * Description:
11 *
12 * This file contains the check_tcp plugin
13 *
14 * License Information:
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 *
30 * $Id$
31
32 *****************************************************************************/
34 /* progname "check_tcp" changes depending on symlink called */
35 char *progname;
36 const char *revision = "$Revision$";
37 const char *copyright = "1999-2006";
38 const char *email = "nagiosplug-devel@lists.sourceforge.net";
40 #include "common.h"
41 #include "netutils.h"
42 #include "utils.h"
43 #include "utils_tcp.h"
45 #ifdef HAVE_SSL
46 static int check_cert = FALSE;
47 static int days_till_exp;
48 # define my_recv(buf, len) ((flags & FLAG_SSL) ? np_net_ssl_read(buf, len) : read(sd, buf, len))
49 # define my_send(buf, len) ((flags & FLAG_SSL) ? np_net_ssl_write(buf, len) : send(sd, buf, len, 0))
50 #else
51 # define my_recv(buf, len) read(sd, buf, len)
52 # define my_send(buf, len) send(sd, buf, len, 0)
53 #endif
55 /* int my_recv(char *, size_t); */
56 static int process_arguments (int, char **);
57 void print_help (void);
58 void print_usage (void);
60 #define EXPECT server_expect[0]
61 static char *SERVICE = "TCP";
62 static char *SEND = NULL;
63 static char *QUIT = NULL;
64 static int PROTOCOL = IPPROTO_TCP; /* most common is default */
65 static int PORT = 0;
67 static int server_port = 0;
68 static char *server_address = NULL;
69 static char *server_send = NULL;
70 static char *server_quit = NULL;
71 static char **server_expect;
72 static size_t server_expect_count = 0;
73 static size_t maxbytes = 0;
74 static char **warn_codes = NULL;
75 static size_t warn_codes_count = 0;
76 static char **crit_codes = NULL;
77 static size_t crit_codes_count = 0;
78 static unsigned int delay = 0;
79 static double warning_time = 0;
80 static double critical_time = 0;
81 static double elapsed_time = 0;
82 static long microsec;
83 static int sd = 0;
84 #define MAXBUF 1024
85 static char buffer[MAXBUF];
86 static int expect_mismatch_state = STATE_WARNING;
88 #define FLAG_SSL 0x01
89 #define FLAG_VERBOSE 0x02
90 #define FLAG_EXACT_MATCH 0x04
91 #define FLAG_TIME_WARN 0x08
92 #define FLAG_TIME_CRIT 0x10
93 #define FLAG_HIDE_OUTPUT 0x20
94 #define FLAG_MATCH_ALL 0x40
95 static size_t flags = FLAG_EXACT_MATCH;
97 int
98 main (int argc, char **argv)
99 {
100         int result = STATE_UNKNOWN;
101         int i;
102         char *status = NULL;
103         struct timeval tv;
104         size_t len;
105         int match = -1;
107         setlocale (LC_ALL, "");
108         bindtextdomain (PACKAGE, LOCALEDIR);
109         textdomain (PACKAGE);
111         /* determine program- and service-name quickly */
112         progname = strrchr(argv[0], '/');
113         if(progname != NULL) progname++;
114         else progname = argv[0];
116         len = strlen(progname);
117         if(len > 6 && !memcmp(progname, "check_", 6)) {
118                 SERVICE = strdup(progname + 6);
119                 for(i = 0; i < len - 6; i++)
120                         SERVICE[i] = toupper(SERVICE[i]);
121         }
123         /* set up a resonable buffer at first (will be realloc()'ed if
124          * user specifies other options) */
125         server_expect = calloc(sizeof(char *), 2);
127         /* determine defaults for this service's protocol */
128         if (!strncmp(SERVICE, "UDP", 3)) {
129                 PROTOCOL = IPPROTO_UDP;
130         }
131         else if (!strncmp(SERVICE, "FTP", 3)) {
132                 EXPECT = "220";
133                 QUIT = "QUIT\r\n";
134                 PORT = 21;
135         }
136         else if (!strncmp(SERVICE, "POP", 3) || !strncmp(SERVICE, "POP3", 4)) {
137                 EXPECT = "+OK";
138                 QUIT = "QUIT\r\n";
139                 PORT = 110;
140         }
141         else if (!strncmp(SERVICE, "SMTP", 4)) {
142                 EXPECT = "220";
143                 QUIT = "QUIT\r\n";
144                 PORT = 25;
145         }
146         else if (!strncmp(SERVICE, "IMAP", 4)) {
147                 EXPECT = "* OK";
148                 QUIT = "a1 LOGOUT\r\n";
149                 PORT = 143;
150         }
151 #ifdef HAVE_SSL
152         else if (!strncmp(SERVICE, "SIMAP", 5)) {
153                 EXPECT = "* OK";
154                 QUIT = "a1 LOGOUT\r\n";
155                 flags |= FLAG_SSL;
156                 PORT = 993;
157         }
158         else if (!strncmp(SERVICE, "SPOP", 4)) {
159                 EXPECT = "+OK";
160                 QUIT = "QUIT\r\n";
161                 flags |= FLAG_SSL;
162                 PORT = 995;
163         }
164         else if (!strncmp(SERVICE, "SSMTP", 5)) {
165                 EXPECT = "220";
166                 QUIT = "QUIT\r\n";
167                 flags |= FLAG_SSL;
168                 PORT = 465;
169         }
170         else if (!strncmp(SERVICE, "JABBER", 6)) {
171                 SEND = "<stream:stream to=\'host\' xmlns=\'jabber:client\' xmlns:stream=\'http://etherx.jabber.org/streams\'>\n";
172                 EXPECT = "<?xml version=\'1.0\'?><stream:stream xmlns=\'jabber:client\' xmlns:stream=\'http://etherx.jabber.org/streams\'";
173                 QUIT = "</stream:stream>\n";
174                 flags |= FLAG_HIDE_OUTPUT;
175                 PORT = 5222;
176         }
177         else if (!strncmp (SERVICE, "NNTPS", 5)) {
178                 server_expect_count = 2;
179                 server_expect[0] = "200";
180                 server_expect[1] = "201";
181                 QUIT = "QUIT\r\n";
182                 flags |= FLAG_SSL;
183                 PORT = 563;
184         }
185 #endif
186         else if (!strncmp (SERVICE, "NNTP", 4)) {
187                 server_expect_count = 2;
188                 server_expect = malloc(sizeof(char *) * server_expect_count);
189                 server_expect[0] = strdup("200");
190                 server_expect[1] = strdup("201");
191                 QUIT = "QUIT\r\n";
192                 PORT = 119;
193         }
194         else if (!strncmp(SERVICE, "CLAMD", 5)) {
195                 SEND = "PING";
196                 EXPECT = "PONG";
197                 QUIT = NULL;
198                 PORT = 3310;
199         }
200         /* fallthrough check, so it's supposed to use reverse matching */
201         else if (strcmp (SERVICE, "TCP"))
202                 usage (_("CRITICAL - Generic check_tcp called with unknown service\n"));
204         server_address = "127.0.0.1";
205         server_port = PORT;
206         server_send = SEND;
207         server_quit = QUIT;
208         status = NULL;
210         if (process_arguments (argc, argv) == ERROR)
211                 usage4 (_("Could not parse arguments"));
213         if(flags & FLAG_VERBOSE) {
214                 printf("Using service %s\n", SERVICE);
215                 printf("Port: %d\n", server_port);
216                 printf("flags: 0x%x\n", (int)flags);
217         }
219         if(EXPECT && !server_expect_count)
220                 server_expect_count++;
222         if(PROTOCOL==IPPROTO_UDP && !(server_expect_count && server_send)){
223                 usage(_("With UDP checks, a send/expect string must be specified."));
224         }
226         /* set up the timer */
227         signal (SIGALRM, socket_timeout_alarm_handler);
228         alarm (socket_timeout);
230         /* try to connect to the host at the given port number */
231         gettimeofday (&tv, NULL);
233         result = np_net_connect (server_address, server_port, &sd, PROTOCOL);
234         if (result == STATE_CRITICAL) return STATE_CRITICAL;
236 #ifdef HAVE_SSL
237         if (flags & FLAG_SSL){
238                 result = np_net_ssl_init(sd);
239                 if (result == STATE_OK && check_cert == TRUE) {
240                         result = np_net_ssl_check_cert(days_till_exp);
241                         if(result != STATE_OK) {
242                                 printf(_("CRITICAL - Cannot retrieve server certificate.\n"));
243                         }
244                 }
245         }
246         if(result != STATE_OK){
247                 np_net_ssl_cleanup();
248                 if(sd) close(sd);
249                 return result;
250         }
251 #endif /* HAVE_SSL */
253         if (server_send != NULL) {              /* Something to send? */
254                 my_send(server_send, strlen(server_send));
255         }
257         if (delay > 0) {
258                 tv.tv_sec += delay;
259                 sleep (delay);
260         }
262         if(flags & FLAG_VERBOSE) {
263                 if (server_send) {
264                         printf("Send string: %s\n", server_send);
265                 }
266                 if (server_quit) {
267                         printf("Quit string: %s\n", server_quit);
268                 }
269                 printf("server_expect_count: %d\n", (int)server_expect_count);
270                 for(i = 0; i < server_expect_count; i++)
271                         printf("\t%d: %s\n", i, server_expect[i]);
272         }
274         /* if(len) later on, we know we have a non-NULL response */
275         len = 0;
276         if (server_expect_count) {
278                 /* watch for the expect string */
279                 while ((i = my_recv(buffer, sizeof(buffer))) > 0) {
280                         status = realloc(status, len + i + 1);
281                         memcpy(&status[len], buffer, i);
282                         len += i;
284                         /* stop reading if user-forced or data-starved */
285                         if(i < sizeof(buffer) || (maxbytes && len >= maxbytes))
286                                 break;
288                         if (maxbytes && len >= maxbytes)
289                                 break;
290                 }
292                 /* no data when expected, so return critical */
293                 if (len == 0)
294                         die (STATE_CRITICAL, _("No data received from host\n"));
296                 /* force null-termination and strip whitespace from end of output */
297                 status[len--] = '\0';
298                 /* print raw output if we're debugging */
299                 if(flags & FLAG_VERBOSE)
300                         printf("received %d bytes from host\n#-raw-recv-------#\n%s\n#-raw-recv-------#\n",
301                                (int)len + 1, status);
302                 while(isspace(status[len])) status[len--] = '\0';
304                 match = np_expect_match(status,
305                                 server_expect,
306                                 server_expect_count,
307                                 (flags & FLAG_MATCH_ALL ? TRUE : FALSE),
308                                 (flags & FLAG_EXACT_MATCH ? TRUE : FALSE),
309                                 (flags & FLAG_VERBOSE ? TRUE : FALSE));
310         }
312         if (server_quit != NULL) {
313                 my_send(server_quit, strlen(server_quit));
314         }
315 #ifdef HAVE_SSL
316         np_net_ssl_cleanup();
317 #endif 
318         if (sd) close (sd);
320         microsec = deltime (tv);
321         elapsed_time = (double)microsec / 1.0e6;
323         if (flags & FLAG_TIME_CRIT && elapsed_time > critical_time)
324                 result = STATE_CRITICAL;
325         else if (flags & FLAG_TIME_WARN && elapsed_time > warning_time)
326                 result = STATE_WARNING;
328         /* did we get the response we hoped? */
329         if(match == FALSE && result != STATE_CRITICAL)
330                 result = expect_mismatch_state;
332         /* reset the alarm */
333         alarm (0);
335         /* this is a bit stupid, because we don't want to print the
336          * response time (which can look ok to the user) if we didn't get
337          * the response we were looking for. if-else */
338         printf("%s %s - ", SERVICE, state_text(result));
340         if(match == FALSE && len && !(flags & FLAG_HIDE_OUTPUT))
341                 printf("Unexpected response from host/socket: %s", status);
342         else {
343                 if(match == FALSE)
344                         printf("Unexpected response from host/socket on ");
345                 else
346                         printf("%.3f second response time on ", elapsed_time);
347                 if(server_address[0] != '/')
348                         printf("port %d", server_port);
349                 else
350                         printf("socket %s", server_address);
351         }
353         if (match != FALSE && !(flags & FLAG_HIDE_OUTPUT) && len)
354                 printf (" [%s]", status);
356         /* perf-data doesn't apply when server doesn't talk properly,
357          * so print all zeroes on warn and crit. Use fperfdata since
358          * localisation settings can make different outputs */
359         if(match == FALSE)
360                 printf ("|%s",
361                                 fperfdata ("time", elapsed_time, "s",
362                                 (flags & FLAG_TIME_WARN ? TRUE : FALSE), 0,
363                                 (flags & FLAG_TIME_CRIT ? TRUE : FALSE), 0,
364                                 TRUE, 0,
365                                 TRUE, socket_timeout)
366                         );
367         else
368                 printf("|%s",
369                                 fperfdata ("time", elapsed_time, "s",
370                                 (flags & FLAG_TIME_WARN ? TRUE : FALSE), warning_time,
371                                 (flags & FLAG_TIME_CRIT ? TRUE : FALSE), critical_time,
372                                 TRUE, 0,
373                                 TRUE, socket_timeout)
374                         );
376         putchar('\n');
377         return result;
382 /* process command-line arguments */
383 static int
384 process_arguments (int argc, char **argv)
386         int c;
387         int escape = 0;
389         int option = 0;
390         static struct option longopts[] = {
391                 {"hostname", required_argument, 0, 'H'},
392                 {"critical", required_argument, 0, 'c'},
393                 {"warning", required_argument, 0, 'w'},
394                 {"critical-codes", required_argument, 0, 'C'},
395                 {"warning-codes", required_argument, 0, 'W'},
396                 {"timeout", required_argument, 0, 't'},
397                 {"protocol", required_argument, 0, 'P'},
398                 {"port", required_argument, 0, 'p'},
399                 {"escape", required_argument, 0, 'E'},
400                 {"all", required_argument, 0, 'A'},
401                 {"send", required_argument, 0, 's'},
402                 {"expect", required_argument, 0, 'e'},
403                 {"maxbytes", required_argument, 0, 'm'},
404                 {"quit", required_argument, 0, 'q'},
405                 {"jail", no_argument, 0, 'j'},
406                 {"delay", required_argument, 0, 'd'},
407                 {"refuse", required_argument, 0, 'r'},
408                 {"mismatch", required_argument, 0, 'M'},
409                 {"use-ipv4", no_argument, 0, '4'},
410                 {"use-ipv6", no_argument, 0, '6'},
411                 {"verbose", no_argument, 0, 'v'},
412                 {"version", no_argument, 0, 'V'},
413                 {"help", no_argument, 0, 'h'},
414 #ifdef HAVE_SSL
415                 {"ssl", no_argument, 0, 'S'},
416                 {"certificate", required_argument, 0, 'D'},
417 #endif
418                 {0, 0, 0, 0}
419         };
421         if (argc < 2)
422                 usage4 (_("No arguments found"));
424         /* backwards compatibility */
425         for (c = 1; c < argc; c++) {
426                 if (strcmp ("-to", argv[c]) == 0)
427                         strcpy (argv[c], "-t");
428                 else if (strcmp ("-wt", argv[c]) == 0)
429                         strcpy (argv[c], "-w");
430                 else if (strcmp ("-ct", argv[c]) == 0)
431                         strcpy (argv[c], "-c");
432         }
434         if (!is_option (argv[1])) {
435                 server_address = argv[1];
436                 argv[1] = argv[0];
437                 argv = &argv[1];
438                 argc--;
439         }
441         while (1) {
442                 c = getopt_long (argc, argv, "+hVv46EAH:s:e:q:m:c:w:t:p:C:W:d:Sr:jD:M:",
443                                  longopts, &option);
445                 if (c == -1 || c == EOF || c == 1)
446                         break;
448                 switch (c) {
449                 case '?':                 /* print short usage statement if args not parsable */
450                         usage5 ();
451                 case 'h':                 /* help */
452                         print_help ();
453                         exit (STATE_OK);
454                 case 'V':                 /* version */
455                         print_revision (progname, revision);
456                         exit (STATE_OK);
457                 case 'v':                 /* verbose mode */
458                         flags |= FLAG_VERBOSE;
459                         break;
460                 case '4':
461                         address_family = AF_INET;
462                         break;
463                 case '6':
464 #ifdef USE_IPV6
465                         address_family = AF_INET6;
466 #else
467                         usage4 (_("IPv6 support not available"));
468 #endif
469                         break;
470                 case 'H':                 /* hostname */
471                         server_address = optarg;
472                         break;
473                 case 'c':                 /* critical */
474                         critical_time = strtod (optarg, NULL);
475                         flags |= FLAG_TIME_CRIT;
476                         break;
477                 case 'j':                 /* hide output */
478                         flags |= FLAG_HIDE_OUTPUT;
479                         break;
480                 case 'w':                 /* warning */
481                         warning_time = strtod (optarg, NULL);
482                         flags |= FLAG_TIME_WARN;
483                         break;
484                 case 'C':
485                         crit_codes = realloc (crit_codes, ++crit_codes_count);
486                         crit_codes[crit_codes_count - 1] = optarg;
487                         break;
488                 case 'W':
489                         warn_codes = realloc (warn_codes, ++warn_codes_count);
490                         warn_codes[warn_codes_count - 1] = optarg;
491                         break;
492                 case 't':                 /* timeout */
493                         if (!is_intpos (optarg))
494                                 usage4 (_("Timeout interval must be a positive integer"));
495                         else
496                                 socket_timeout = atoi (optarg);
497                         break;
498                 case 'p':                 /* port */
499                         if (!is_intpos (optarg))
500                                 usage4 (_("Port must be a positive integer"));
501                         else
502                                 server_port = atoi (optarg);
503                         break;
504                 case 'E':
505                         escape = 1;
506                         break;
507                 case 's':
508                         if (escape)
509                                 server_send = np_escaped_string(optarg);
510                         else
511                                 asprintf(&server_send, "%s", optarg);
512                         break;
513                 case 'e': /* expect string (may be repeated) */
514                         flags &= ~FLAG_EXACT_MATCH;
515                         if (server_expect_count == 0)
516                                 server_expect = malloc (sizeof (char *) * (++server_expect_count));
517                         else
518                                 server_expect = realloc (server_expect, sizeof (char *) * (++server_expect_count));
519                         server_expect[server_expect_count - 1] = optarg;
520                         break;
521                 case 'm':
522                         if (!is_intpos (optarg))
523                                 usage4 (_("Maxbytes must be a positive integer"));
524                         else
525                                 maxbytes = strtol (optarg, NULL, 0);
526                         break;
527                 case 'q':
528                         if (escape)
529                                 server_quit = np_escaped_string(optarg);
530                         else
531                                 asprintf(&server_quit, "%s\r\n", optarg);
532                         break;
533                 case 'r':
534                         if (!strncmp(optarg,"ok",2))
535                                 econn_refuse_state = STATE_OK;
536                         else if (!strncmp(optarg,"warn",4))
537                                 econn_refuse_state = STATE_WARNING;
538                         else if (!strncmp(optarg,"crit",4))
539                                 econn_refuse_state = STATE_CRITICAL;
540                         else
541                                 usage4 (_("Refuse must be one of ok, warn, crit"));
542                         break;
543                 case 'M':
544                         if (!strncmp(optarg,"ok",2))
545                                 expect_mismatch_state = STATE_OK;
546                         else if (!strncmp(optarg,"warn",4))
547                                 expect_mismatch_state = STATE_WARNING;
548                         else if (!strncmp(optarg,"crit",4))
549                                 expect_mismatch_state = STATE_CRITICAL;
550                         else
551                                 usage4 (_("Mismatch must be one of ok, warn, crit"));
552                         break;
553                 case 'd':
554                         if (is_intpos (optarg))
555                                 delay = atoi (optarg);
556                         else
557                                 usage4 (_("Delay must be a positive integer"));
558                         break;
559                 case 'D': /* Check SSL cert validity - days 'til certificate expiration */
560 #ifdef HAVE_SSL
561 #  ifdef USE_OPENSSL /* XXX */
562                         if (!is_intnonneg (optarg))
563                                 usage2 (_("Invalid certificate expiration period"), optarg);
564                         days_till_exp = atoi (optarg);
565                         check_cert = TRUE;
566                         flags |= FLAG_SSL;
567                         break;
568 #  endif /* USE_OPENSSL */
569 #endif
570                         /* fallthrough if we don't have ssl */
571                 case 'S':
572 #ifdef HAVE_SSL
573                         flags |= FLAG_SSL;
574 #else
575                         die (STATE_UNKNOWN, _("Invalid option - SSL is not available"));
576 #endif
577                         break;
578                 case 'A':
579                         flags |= FLAG_MATCH_ALL;
580                         break;
581                 }
582         }
584         if (server_address == NULL)
585                 usage4 (_("You must provide a server address"));
586         else if (server_address[0] != '/' && is_host (server_address) == FALSE)
587                 die (STATE_CRITICAL, "%s %s - %s: %s\n", SERVICE, state_text(STATE_CRITICAL), _("Invalid hostname, address or socket"), server_address);
589         return TRUE;
593 void
594 print_help (void)
596         print_revision (progname, revision);
598         printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
599         printf (COPYRIGHT, copyright, email);
601         printf (_("This plugin tests %s connections with the specified host (or unix socket).\n\n"),
602                 SERVICE);
604         print_usage ();
606         printf (_(UT_HELP_VRSN));
608         printf (_(UT_HOST_PORT), 'p', "none");
610         printf (_(UT_IPv46));
612         printf (" %s\n", "-E, --escape");
613   printf ("    %s\n", _("Can use \\n, \\r, \\t or \\ in send or quit string. Must come before send or quit option"));
614   printf ("    %s\n", _("Default: nothing added to send, \\r\\n added to end of quit"));
615   printf (" %s\n", "-s, --send=STRING");
616   printf ("    %s\n", _("String to send to the server"));
617   printf (" %s\n", "-e, --expect=STRING");
618   printf ("    %s %s\n", _("String to expect in server response"), _("(may be repeated)"));
619   printf (" %s\n", "-A, --all");
620   printf ("    %s\n", _("All expect strings need to occur in server response. Default is any"));
621   printf (" %s\n", "-q, --quit=STRING");
622   printf ("    %s\n", _("String to send server to initiate a clean close of the connection"));
623   printf (" %s\n", "-r, --refuse=ok|warn|crit");
624   printf ("    %s\n", _("Accept tcp refusals with states ok, warn, crit (default: crit)"));
625   printf (" %s\n", "-M, --mismatch=ok|warn|crit");
626   printf ("    %s\n", _("Accept expected string mismatches with states ok, warn, crit (default: warn)"));
627   printf (" %s\n", "-j, --jail");
628   printf ("    %s\n", _("Hide output from TCP socket"));
629   printf (" %s\n", "-m, --maxbytes=INTEGER");
630   printf ("    %s\n", _("Close connection once more than this number of bytes are received"));
631   printf (" %s\n", "-d, --delay=INTEGER");
632   printf ("    %s\n", _("Seconds to wait between sending string and polling for response"));
634 #ifdef HAVE_SSL
635         printf (" %s\n", "-D, --certificate=INTEGER");
636   printf ("    %s\n", _("Minimum number of days a certificate has to be valid."));
637   printf (" %s\n", "-S, --ssl");
638   printf ("    %s\n", _("Use SSL for the connection."));
639 #endif
641         printf (_(UT_WARN_CRIT));
643         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
645         printf (_(UT_VERBOSE));
647         printf (_(UT_SUPPORT));
651 void
652 print_usage (void)
654         printf (_("Usage:"));
655   printf ("%s -H host -p port [-w <warning time>] [-c <critical time>] [-s <send string>]\n",progname);
656   printf ("[-e <expect string>] [-q <quit string>][-m <maximum bytes>] [-d <delay>]\n");
657   printf ("[-t <timeout seconds>] [-r <refuse state>] [-M <mismatch state>] [-v] [-4|-6] [-j]\n");
658   printf ("[-D <days to cert expiry>] [-S <use SSL>] [-E]\n");