plugins/check_tcp.c

   1 /*****************************************************************************
   2  *
   3  * Monitoring check_tcp plugin
   4  *
   5  * License: GPL
   6  * Copyright (c) 1999-2024 Monitoring Plugins Development Team
   7  *
   8  * Description:
   9  *
  10  * This file contains the check_tcp plugin
  11  *
  12  *
  13  * This program is free software: you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation, either version 3 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  25  *
  26  * $Id$
  27  *
  28  *****************************************************************************/
  29
  30 /* progname "check_tcp" changes depending on symlink called */
  31 char *progname;
  32 const char *copyright = "1999-2024";
  33 const char *email = "devel@monitoring-plugins.org";
  34
  35 #include "common.h"
  36 #include "netutils.h"
  37 #include "utils.h"
  38 #include "utils_tcp.h"
  39
  40 #include <ctype.h>
  41 #include <sys/select.h>
  42
  43 #ifdef HAVE_SSL
  44 static bool check_cert = false;
  45 static int days_till_exp_warn, days_till_exp_crit;
  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
  52
  53 /* int my_recv(char *, size_t); */
  54 static int process_arguments(int /*argc*/, char ** /*argv*/);
  55 static void print_help(void);
  56 void print_usage(void);
  57
  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;
  64 static int READ_TIMEOUT = 2;
  65
  66 static int server_port = 0;
  67 static char *server_address = NULL;
  68 static bool host_specified = false;
  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 ssize_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;
  87 static int match_flags = NP_MATCH_EXACT;
  88
  89 #ifdef HAVE_SSL
  90 static char *sni = NULL;
  91 static bool sni_specified = false;
  92 #endif
  93
  94 #define FLAG_SSL         0x01
  95 #define FLAG_VERBOSE     0x02
  96 #define FLAG_TIME_WARN   0x04
  97 #define FLAG_TIME_CRIT   0x08
  98 #define FLAG_HIDE_OUTPUT 0x10
  99 static size_t flags;
 100
 101 int main(int argc, char **argv) {
 102         setlocale(LC_ALL, "");
 103         bindtextdomain(PACKAGE, LOCALEDIR);
 104         textdomain(PACKAGE);
 105
 106         /* determine program- and service-name quickly */
 107         progname = strrchr(argv[0], '/');
 108         if (progname != NULL)
 109                 progname++;
 110         else
 111                 progname = argv[0];
 112
 113         size_t prog_name_len = strlen(progname);
 114         if (prog_name_len > 6 && !memcmp(progname, "check_", 6)) {
 115                 SERVICE = strdup(progname + 6);
 116                 for (size_t i = 0; i < prog_name_len - 6; i++)
 117                         SERVICE[i] = toupper(SERVICE[i]);
 118         }
 119
 120         /* set up a reasonable buffer at first (will be realloc()'ed if
 121          * user specifies other options) */
 122         server_expect = calloc(2, sizeof(char *));
 123
 124         /* determine defaults for this service's protocol */
 125         if (!strncmp(SERVICE, "UDP", 3)) {
 126                 PROTOCOL = IPPROTO_UDP;
 127         } else if (!strncmp(SERVICE, "FTP", 3)) {
 128                 EXPECT = "220";
 129                 QUIT = "QUIT\r\n";
 130                 PORT = 21;
 131         } else if (!strncmp(SERVICE, "POP", 3) || !strncmp(SERVICE, "POP3", 4)) {
 132                 EXPECT = "+OK";
 133                 QUIT = "QUIT\r\n";
 134                 PORT = 110;
 135         } else if (!strncmp(SERVICE, "SMTP", 4)) {
 136                 EXPECT = "220";
 137                 QUIT = "QUIT\r\n";
 138                 PORT = 25;
 139         } else if (!strncmp(SERVICE, "IMAP", 4)) {
 140                 EXPECT = "* OK";
 141                 QUIT = "a1 LOGOUT\r\n";
 142                 PORT = 143;
 143         }
 144 #ifdef HAVE_SSL
 145         else if (!strncmp(SERVICE, "SIMAP", 5)) {
 146                 EXPECT = "* OK";
 147                 QUIT = "a1 LOGOUT\r\n";
 148                 flags |= FLAG_SSL;
 149                 PORT = 993;
 150         } else if (!strncmp(SERVICE, "SPOP", 4)) {
 151                 EXPECT = "+OK";
 152                 QUIT = "QUIT\r\n";
 153                 flags |= FLAG_SSL;
 154                 PORT = 995;
 155         } else if (!strncmp(SERVICE, "SSMTP", 5)) {
 156                 EXPECT = "220";
 157                 QUIT = "QUIT\r\n";
 158                 flags |= FLAG_SSL;
 159                 PORT = 465;
 160         } else if (!strncmp(SERVICE, "JABBER", 6)) {
 161                 SEND = "<stream:stream to=\'host\' xmlns=\'jabber:client\' xmlns:stream=\'http://etherx.jabber.org/streams\'>\n";
 162                 EXPECT = "<?xml version=\'1.0\'";
 163                 QUIT = "</stream:stream>\n";
 164                 flags |= FLAG_HIDE_OUTPUT;
 165                 PORT = 5222;
 166         } else if (!strncmp(SERVICE, "NNTPS", 5)) {
 167                 server_expect_count = 2;
 168                 server_expect[0] = "200";
 169                 server_expect[1] = "201";
 170                 QUIT = "QUIT\r\n";
 171                 flags |= FLAG_SSL;
 172                 PORT = 563;
 173         }
 174 #endif
 175         else if (!strncmp(SERVICE, "NNTP", 4)) {
 176                 server_expect_count = 2;
 177                 server_expect = malloc(sizeof(char *) * server_expect_count);
 178                 server_expect[0] = strdup("200");
 179                 server_expect[1] = strdup("201");
 180                 QUIT = "QUIT\r\n";
 181                 PORT = 119;
 182         } else if (!strncmp(SERVICE, "CLAMD", 5)) {
 183                 SEND = "PING";
 184                 EXPECT = "PONG";
 185                 QUIT = NULL;
 186                 PORT = 3310;
 187         }
 188         /* fallthrough check, so it's supposed to use reverse matching */
 189         else if (strcmp(SERVICE, "TCP"))
 190                 usage(_("CRITICAL - Generic check_tcp called with unknown service\n"));
 191
 192         server_address = "127.0.0.1";
 193         server_port = PORT;
 194         server_send = SEND;
 195         server_quit = QUIT;
 196         char *status = NULL;
 197
 198         /* Parse extra opts if any */
 199         argv = np_extra_opts(&argc, argv, progname);
 200
 201         if (process_arguments(argc, argv) == ERROR)
 202                 usage4(_("Could not parse arguments"));
 203
 204         if (flags & FLAG_VERBOSE) {
 205                 printf("Using service %s\n", SERVICE);
 206                 printf("Port: %d\n", server_port);
 207                 printf("flags: 0x%x\n", (int)flags);
 208         }
 209
 210         if (EXPECT && !server_expect_count)
 211                 server_expect_count++;
 212
 213         if (PROTOCOL == IPPROTO_UDP && !(server_expect_count && server_send)) {
 214                 usage(_("With UDP checks, a send/expect string must be specified."));
 215         }
 216
 217         /* set up the timer */
 218         signal(SIGALRM, socket_timeout_alarm_handler);
 219         alarm(socket_timeout);
 220
 221         /* try to connect to the host at the given port number */
 222         struct timeval tv;
 223         gettimeofday(&tv, NULL);
 224
 225         int result = STATE_UNKNOWN;
 226         result = np_net_connect(server_address, server_port, &sd, PROTOCOL);
 227         if (result == STATE_CRITICAL)
 228                 return econn_refuse_state;
 229
 230 #ifdef HAVE_SSL
 231         if (flags & FLAG_SSL) {
 232                 result = np_net_ssl_init_with_hostname(sd, (sni_specified ? sni : NULL));
 233                 if (result == STATE_OK && check_cert) {
 234                         result = np_net_ssl_check_cert(days_till_exp_warn, days_till_exp_crit);
 235                 }
 236         }
 237         if (result != STATE_OK) {
 238                 if (sd)
 239                         close(sd);
 240                 np_net_ssl_cleanup();
 241                 return result;
 242         }
 243 #endif /* HAVE_SSL */
 244
 245         if (server_send != NULL) { /* Something to send? */
 246                 my_send(server_send, strlen(server_send));
 247         }
 248
 249         if (delay > 0) {
 250                 tv.tv_sec += delay;
 251                 sleep(delay);
 252         }
 253
 254         if (flags & FLAG_VERBOSE) {
 255                 if (server_send) {
 256                         printf("Send string: %s\n", server_send);
 257                 }
 258                 if (server_quit) {
 259                         printf("Quit string: %s\n", server_quit);
 260                 }
 261                 printf("server_expect_count: %d\n", (int)server_expect_count);
 262                 for (size_t i = 0; i < server_expect_count; i++)
 263                         printf("\t%zd: %s\n", i, server_expect[i]);
 264         }
 265
 266         /* if(len) later on, we know we have a non-NULL response */
 267         ssize_t len = 0;
 268
 269         int match = -1;
 270         struct timeval timeout;
 271         fd_set rfds;
 272         FD_ZERO(&rfds);
 273         if (server_expect_count) {
 274                 ssize_t received = 0;
 275
 276                 /* watch for the expect string */
 277                 while ((received = my_recv(buffer, sizeof(buffer))) > 0) {
 278                         status = realloc(status, len + received + 1);
 279                         memcpy(&status[len], buffer, received);
 280                         len += received;
 281                         status[len] = '\0';
 282
 283                         /* stop reading if user-forced */
 284                         if (maxbytes && len >= maxbytes)
 285                                 break;
 286
 287                         if ((match = np_expect_match(status, server_expect, server_expect_count, match_flags)) != NP_MATCH_RETRY)
 288                                 break;
 289
 290                         /* some protocols wait for further input, so make sure we don't wait forever */
 291                         FD_SET(sd, &rfds);
 292                         timeout.tv_sec = READ_TIMEOUT;
 293                         timeout.tv_usec = 0;
 294                         if (select(sd + 1, &rfds, NULL, NULL, &timeout) <= 0)
 295                                 break;
 296                 }
 297
 298                 if (match == NP_MATCH_RETRY)
 299                         match = NP_MATCH_FAILURE;
 300
 301                 /* no data when expected, so return critical */
 302                 if (len == 0)
 303                         die(STATE_CRITICAL, _("No data received from host\n"));
 304
 305                 /* print raw output if we're debugging */
 306                 if (flags & FLAG_VERBOSE)
 307                         printf("received %d bytes from host\n#-raw-recv-------#\n%s\n#-raw-recv-------#\n", (int)len + 1, status);
 308                 /* strip whitespace from end of output */
 309                 while (--len > 0 && isspace(status[len]))
 310                         status[len] = '\0';
 311         }
 312
 313         if (server_quit != NULL) {
 314                 my_send(server_quit, strlen(server_quit));
 315         }
 316         if (sd)
 317                 close(sd);
 318 #ifdef HAVE_SSL
 319         np_net_ssl_cleanup();
 320 #endif
 321
 322         microsec = deltime(tv);
 323         elapsed_time = (double)microsec / 1.0e6;
 324
 325         if (flags & FLAG_TIME_CRIT && elapsed_time > critical_time)
 326                 result = STATE_CRITICAL;
 327         else if (flags & FLAG_TIME_WARN && elapsed_time > warning_time)
 328                 result = STATE_WARNING;
 329
 330         /* did we get the response we hoped? */
 331         if (match == NP_MATCH_FAILURE && result != STATE_CRITICAL)
 332                 result = expect_mismatch_state;
 333
 334         /* reset the alarm */
 335         alarm(0);
 336
 337         /* this is a bit stupid, because we don't want to print the
 338          * response time (which can look ok to the user) if we didn't get
 339          * the response we were looking for. if-else */
 340         printf("%s %s - ", SERVICE, state_text(result));
 341
 342         if (match == NP_MATCH_FAILURE && len && !(flags & FLAG_HIDE_OUTPUT))
 343                 printf("Unexpected response from host/socket: %s", status);
 344         else {
 345                 if (match == NP_MATCH_FAILURE)
 346                         printf("Unexpected response from host/socket on ");
 347                 else
 348                         printf("%.3f second response time on ", elapsed_time);
 349                 if (server_address[0] != '/') {
 350                         if (host_specified)
 351                                 printf("%s port %d", server_address, server_port);
 352                         else
 353                                 printf("port %d", server_port);
 354                 } else
 355                         printf("socket %s", server_address);
 356         }
 357
 358         if (match != NP_MATCH_FAILURE && !(flags & FLAG_HIDE_OUTPUT) && len)
 359                 printf(" [%s]", status);
 360
 361         /* perf-data doesn't apply when server doesn't talk properly,
 362          * so print all zeroes on warn and crit. Use fperfdata since
 363          * localisation settings can make different outputs */
 364         if (match == NP_MATCH_FAILURE)
 365                 printf("|%s", fperfdata("time", elapsed_time, "s", (flags & FLAG_TIME_WARN ? true : false), 0,
 366                                                                 (flags & FLAG_TIME_CRIT ? true : false), 0, true, 0, true, socket_timeout));
 367         else
 368                 printf("|%s", fperfdata("time", elapsed_time, "s", (flags & FLAG_TIME_WARN ? true : false), warning_time,
 369                                                                 (flags & FLAG_TIME_CRIT ? true : false), critical_time, true, 0, true, socket_timeout));
 370
 371         putchar('\n');
 372         return result;
 373 }
 374
 375 /* process command-line arguments */
 376 static int process_arguments(int argc, char **argv) {
 377         enum {
 378                 SNI_OPTION = CHAR_MAX + 1
 379         };
 380
 381         static struct option longopts[] = {{"hostname", required_argument, 0, 'H'},
 382                                                                            {"critical", required_argument, 0, 'c'},
 383                                                                            {"warning", required_argument, 0, 'w'},
 384                                                                            {"critical-codes", required_argument, 0, 'C'},
 385                                                                            {"warning-codes", required_argument, 0, 'W'},
 386                                                                            {"timeout", required_argument, 0, 't'},
 387                                                                            {"protocol", required_argument, 0, 'P'}, /* FIXME: Unhandled */
 388                                                                            {"port", required_argument, 0, 'p'},
 389                                                                            {"escape", no_argument, 0, 'E'},
 390                                                                            {"all", no_argument, 0, 'A'},
 391                                                                            {"send", required_argument, 0, 's'},
 392                                                                            {"expect", required_argument, 0, 'e'},
 393                                                                            {"maxbytes", required_argument, 0, 'm'},
 394                                                                            {"quit", required_argument, 0, 'q'},
 395                                                                            {"jail", no_argument, 0, 'j'},
 396                                                                            {"delay", required_argument, 0, 'd'},
 397                                                                            {"refuse", required_argument, 0, 'r'},
 398                                                                            {"mismatch", required_argument, 0, 'M'},
 399                                                                            {"use-ipv4", no_argument, 0, '4'},
 400                                                                            {"use-ipv6", no_argument, 0, '6'},
 401                                                                            {"verbose", no_argument, 0, 'v'},
 402                                                                            {"version", no_argument, 0, 'V'},
 403                                                                            {"help", no_argument, 0, 'h'},
 404                                                                            {"ssl", no_argument, 0, 'S'},
 405                                                                            {"sni", required_argument, 0, SNI_OPTION},
 406                                                                            {"certificate", required_argument, 0, 'D'},
 407                                                                            {0, 0, 0, 0}};
 408
 409         if (argc < 2)
 410                 usage4(_("No arguments found"));
 411
 412         /* backwards compatibility */
 413         for (int i = 1; i < argc; i++) {
 414                 if (strcmp("-to", argv[i]) == 0)
 415                         strcpy(argv[i], "-t");
 416                 else if (strcmp("-wt", argv[i]) == 0)
 417                         strcpy(argv[i], "-w");
 418                 else if (strcmp("-ct", argv[i]) == 0)
 419                         strcpy(argv[i], "-c");
 420         }
 421
 422         if (!is_option(argv[1])) {
 423                 server_address = argv[1];
 424                 argv[1] = argv[0];
 425                 argv = &argv[1];
 426                 argc--;
 427         }
 428
 429         int option_char;
 430         bool escape = false;
 431         while (true) {
 432                 int option = 0;
 433                 option_char = getopt_long(argc, argv, "+hVv46EAH:s:e:q:m:c:w:t:p:C:W:d:Sr:jD:M:", longopts, &option);
 434
 435                 if (option_char == -1 || option_char == EOF || option_char == 1)
 436                         break;
 437
 438                 switch (option_char) {
 439                 case '?': /* print short usage statement if args not parsable */
 440                         usage5();
 441                 case 'h': /* help */
 442                         print_help();
 443                         exit(STATE_UNKNOWN);
 444                 case 'V': /* version */
 445                         print_revision(progname, NP_VERSION);
 446                         exit(STATE_UNKNOWN);
 447                 case 'v': /* verbose mode */
 448                         flags |= FLAG_VERBOSE;
 449                         match_flags |= NP_MATCH_VERBOSE;
 450                         break;
 451                 case '4':
 452                         address_family = AF_INET;
 453                         break;
 454                 case '6':
 455 #ifdef USE_IPV6
 456                         address_family = AF_INET6;
 457 #else
 458                         usage4(_("IPv6 support not available"));
 459 #endif
 460                         break;
 461                 case 'H': /* hostname */
 462                         host_specified = true;
 463                         server_address = optarg;
 464                         break;
 465                 case 'c': /* critical */
 466                         critical_time = strtod(optarg, NULL);
 467                         flags |= FLAG_TIME_CRIT;
 468                         break;
 469                 case 'j': /* hide output */
 470                         flags |= FLAG_HIDE_OUTPUT;
 471                         break;
 472                 case 'w': /* warning */
 473                         warning_time = strtod(optarg, NULL);
 474                         flags |= FLAG_TIME_WARN;
 475                         break;
 476                 case 'C':
 477                         crit_codes = realloc(crit_codes, ++crit_codes_count);
 478                         crit_codes[crit_codes_count - 1] = optarg;
 479                         break;
 480                 case 'W':
 481                         warn_codes = realloc(warn_codes, ++warn_codes_count);
 482                         warn_codes[warn_codes_count - 1] = optarg;
 483                         break;
 484                 case 't': /* timeout */
 485                         if (!is_intpos(optarg))
 486                                 usage4(_("Timeout interval must be a positive integer"));
 487                         else
 488                                 socket_timeout = atoi(optarg);
 489                         break;
 490                 case 'p': /* port */
 491                         if (!is_intpos(optarg))
 492                                 usage4(_("Port must be a positive integer"));
 493                         else
 494                                 server_port = atoi(optarg);
 495                         break;
 496                 case 'E':
 497                         escape = true;
 498                         break;
 499                 case 's':
 500                         if (escape)
 501                                 server_send = np_escaped_string(optarg);
 502                         else
 503                                 xasprintf(&server_send, "%s", optarg);
 504                         break;
 505                 case 'e': /* expect string (may be repeated) */
 506                         match_flags &= ~NP_MATCH_EXACT;
 507                         if (server_expect_count == 0)
 508                                 server_expect = malloc(sizeof(char *) * (++server_expect_count));
 509                         else
 510                                 server_expect = realloc(server_expect, sizeof(char *) * (++server_expect_count));
 511                         server_expect[server_expect_count - 1] = optarg;
 512                         break;
 513                 case 'm':
 514                         if (!is_intpos(optarg))
 515                                 usage4(_("Maxbytes must be a positive integer"));
 516                         else
 517                                 maxbytes = strtol(optarg, NULL, 0);
 518                         break;
 519                 case 'q':
 520                         if (escape)
 521                                 server_quit = np_escaped_string(optarg);
 522                         else
 523                                 xasprintf(&server_quit, "%s\r\n", optarg);
 524                         break;
 525                 case 'r':
 526                         if (!strncmp(optarg, "ok", 2))
 527                                 econn_refuse_state = STATE_OK;
 528                         else if (!strncmp(optarg, "warn", 4))
 529                                 econn_refuse_state = STATE_WARNING;
 530                         else if (!strncmp(optarg, "crit", 4))
 531                                 econn_refuse_state = STATE_CRITICAL;
 532                         else
 533                                 usage4(_("Refuse must be one of ok, warn, crit"));
 534                         break;
 535                 case 'M':
 536                         if (!strncmp(optarg, "ok", 2))
 537                                 expect_mismatch_state = STATE_OK;
 538                         else if (!strncmp(optarg, "warn", 4))
 539                                 expect_mismatch_state = STATE_WARNING;
 540                         else if (!strncmp(optarg, "crit", 4))
 541                                 expect_mismatch_state = STATE_CRITICAL;
 542                         else
 543                                 usage4(_("Mismatch must be one of ok, warn, crit"));
 544                         break;
 545                 case 'd':
 546                         if (is_intpos(optarg))
 547                                 delay = atoi(optarg);
 548                         else
 549                                 usage4(_("Delay must be a positive integer"));
 550                         break;
 551                 case 'D': { /* Check SSL cert validity - days 'til certificate expiration */
 552 #ifdef HAVE_SSL
 553 #       ifdef USE_OPENSSL /* XXX */
 554                         char *temp;
 555                         if ((temp = strchr(optarg, ',')) != NULL) {
 556                                 *temp = '\0';
 557                                 if (!is_intnonneg(optarg))
 558                                         usage2(_("Invalid certificate expiration period"), optarg);
 559                                 days_till_exp_warn = atoi(optarg);
 560                                 *temp = ',';
 561                                 temp++;
 562                                 if (!is_intnonneg(temp))
 563                                         usage2(_("Invalid certificate expiration period"), temp);
 564                                 days_till_exp_crit = atoi(temp);
 565                         } else {
 566                                 days_till_exp_crit = 0;
 567                                 if (!is_intnonneg(optarg))
 568                                         usage2(_("Invalid certificate expiration period"), optarg);
 569                                 days_till_exp_warn = atoi(optarg);
 570                         }
 571                         check_cert = true;
 572                         flags |= FLAG_SSL;
 573                 } break;
 574 #       endif /* USE_OPENSSL */
 575 #endif
 576                         /* fallthrough if we don't have ssl */
 577                 case 'S':
 578 #ifdef HAVE_SSL
 579                         flags |= FLAG_SSL;
 580 #else
 581                         die(STATE_UNKNOWN, _("Invalid option - SSL is not available"));
 582 #endif
 583                         break;
 584                 case SNI_OPTION:
 585 #ifdef HAVE_SSL
 586                         flags |= FLAG_SSL;
 587                         sni_specified = true;
 588                         sni = optarg;
 589 #else
 590                         die(STATE_UNKNOWN, _("Invalid option - SSL is not available"));
 591 #endif
 592                         break;
 593                 case 'A':
 594                         match_flags |= NP_MATCH_ALL;
 595                         break;
 596                 }
 597         }
 598
 599         option_char = optind;
 600         if (!host_specified && option_char < argc)
 601                 server_address = strdup(argv[option_char++]);
 602
 603         if (server_address == NULL)
 604                 usage4(_("You must provide a server address"));
 605         else if (server_address[0] != '/' && !is_host(server_address))
 606                 die(STATE_CRITICAL, "%s %s - %s: %s\n", SERVICE, state_text(STATE_CRITICAL), _("Invalid hostname, address or socket"),
 607                         server_address);
 608
 609         return OK;
 610 }
 611
 612 void print_help(void) {
 613         print_revision(progname, NP_VERSION);
 614
 615         printf("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
 616         printf(COPYRIGHT, copyright, email);
 617
 618         printf(_("This plugin tests %s connections with the specified host (or unix socket).\n\n"), SERVICE);
 619
 620         print_usage();
 621
 622         printf(UT_HELP_VRSN);
 623         printf(UT_EXTRA_OPTS);
 624
 625         printf(UT_HOST_PORT, 'p', "none");
 626
 627         printf(UT_IPv46);
 628
 629         printf(" %s\n", "-E, --escape");
 630         printf("    %s\n", _("Can use \\n, \\r, \\t or \\\\ in send or quit string. Must come before send or quit option"));
 631         printf("    %s\n", _("Default: nothing added to send, \\r\\n added to end of quit"));
 632         printf(" %s\n", "-s, --send=STRING");
 633         printf("    %s\n", _("String to send to the server"));
 634         printf(" %s\n", "-e, --expect=STRING");
 635         printf("    %s %s\n", _("String to expect in server response"), _("(may be repeated)"));
 636         printf(" %s\n", "-A, --all");
 637         printf("    %s\n", _("All expect strings need to occur in server response. Default is any"));
 638         printf(" %s\n", "-q, --quit=STRING");
 639         printf("    %s\n", _("String to send server to initiate a clean close of the connection"));
 640         printf(" %s\n", "-r, --refuse=ok|warn|crit");
 641         printf("    %s\n", _("Accept TCP refusals with states ok, warn, crit (default: crit)"));
 642         printf(" %s\n", "-M, --mismatch=ok|warn|crit");
 643         printf("    %s\n", _("Accept expected string mismatches with states ok, warn, crit (default: warn)"));
 644         printf(" %s\n", "-j, --jail");
 645         printf("    %s\n", _("Hide output from TCP socket"));
 646         printf(" %s\n", "-m, --maxbytes=INTEGER");
 647         printf("    %s\n", _("Close connection once more than this number of bytes are received"));
 648         printf(" %s\n", "-d, --delay=INTEGER");
 649         printf("    %s\n", _("Seconds to wait between sending string and polling for response"));
 650
 651 #ifdef HAVE_SSL
 652         printf(" %s\n", "-D, --certificate=INTEGER[,INTEGER]");
 653         printf("    %s\n", _("Minimum number of days a certificate has to be valid."));
 654         printf("    %s\n", _("1st is #days for warning, 2nd is critical (if not specified - 0)."));
 655         printf(" %s\n", "-S, --ssl");
 656         printf("    %s\n", _("Use SSL for the connection."));
 657         printf(" %s\n", "--sni=STRING");
 658         printf("    %s\n", _("SSL server_name"));
 659 #endif
 660
 661         printf(UT_WARN_CRIT);
 662
 663         printf(UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
 664
 665         printf(UT_VERBOSE);
 666
 667         printf(UT_SUPPORT);
 668 }
 669
 670 void print_usage(void) {
 671         printf("%s\n", _("Usage:"));
 672         printf("%s -H host -p port [-w <warning time>] [-c <critical time>] [-s <send string>]\n", progname);
 673         printf("[-e <expect string>] [-q <quit string>][-m <maximum bytes>] [-d <delay>]\n");
 674         printf("[-t <timeout seconds>] [-r <refuse state>] [-M <mismatch state>] [-v] [-4|-6] [-j]\n");
 675         printf("[-D <warn days cert expire>[,<crit days cert expire>]] [-S <use SSL>] [-E]\n");
 676 }