plugins/check_smtp.c

   1 /******************************************************************************
   2 *
   3 * Nagios check_smtp 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_smtp 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 *
  31 * $Id$
  32 *
  33 ******************************************************************************/
  34
  35 const char *progname = "check_smtp";
  36 const char *revision = "$Revision$";
  37 const char *copyright = "2000-2006";
  38 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  39
  40 #include "common.h"
  41 #include "netutils.h"
  42 #include "utils.h"
  43
  44 #ifdef HAVE_SSL
  45 int check_cert = FALSE;
  46 int days_till_exp;
  47 #  define my_recv(buf, len) ((use_ssl && ssl_established) ? np_net_ssl_read(buf, len) : read(sd, buf, len))
  48 #  define my_send(buf, len) ((use_ssl && ssl_established) ? np_net_ssl_write(buf, len) : send(sd, buf, len, 0))
  49 #else /* ifndef HAVE_SSL */
  50 #  define my_recv(buf, len) read(sd, buf, len)
  51 #  define my_send(buf, len) send(sd, buf, len, 0)
  52 #endif
  53
  54 enum {
  55         SMTP_PORT       = 25
  56 };
  57 #define SMTP_EXPECT "220"
  58 #define SMTP_HELO "HELO "
  59 #define SMTP_EHLO "EHLO "
  60 #define SMTP_QUIT "QUIT\r\n"
  61 #define SMTP_STARTTLS "STARTTLS\r\n"
  62 #define SMTP_AUTH_LOGIN "AUTH LOGIN\r\n"
  63
  64 #ifndef HOST_MAX_BYTES
  65 #define HOST_MAX_BYTES 255
  66 #endif
  67
  68 #define EHLO_SUPPORTS_STARTTLS 1
  69
  70 int process_arguments (int, char **);
  71 int validate_arguments (void);
  72 void print_help (void);
  73 void print_usage (void);
  74 int my_close(void);
  75
  76 #include "regex.h"
  77 char regex_expect[MAX_INPUT_BUFFER] = "";
  78 regex_t preg;
  79 regmatch_t pmatch[10];
  80 char timestamp[20] = "";
  81 char errbuf[MAX_INPUT_BUFFER];
  82 int cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
  83 int eflags = 0;
  84 int errcode, excode;
  85
  86 int server_port = SMTP_PORT;
  87 char *server_address = NULL;
  88 char *server_expect = NULL;
  89 int smtp_use_dummycmd = 0;
  90 char *mail_command = NULL;
  91 char *from_arg = NULL;
  92 int ncommands=0;
  93 int command_size=0;
  94 int nresponses=0;
  95 int response_size=0;
  96 char **commands = NULL;
  97 char **responses = NULL;
  98 char *authtype = NULL;
  99 char *authuser = NULL;
 100 char *authpass = NULL;
 101 int warning_time = 0;
 102 int check_warning_time = FALSE;
 103 int critical_time = 0;
 104 int check_critical_time = FALSE;
 105 int verbose = 0;
 106 int use_ssl = FALSE;
 107 short use_ehlo = FALSE;
 108 short ssl_established = 0;
 109 char *localhostname = NULL;
 110 int sd;
 111 char buffer[MAX_INPUT_BUFFER];
 112 enum {
 113   TCP_PROTOCOL = 1,
 114   UDP_PROTOCOL = 2,
 115   MAXBUF = 1024
 116 };
 117
 118 /* written by lauri alanko */
 119 static char *
 120 base64 (const char *bin, size_t len)
 121 {
 122
 123         char *buf = (char *) malloc ((len + 2) / 3 * 4 + 1);
 124         size_t i = 0, j = 0;
 125
 126         char BASE64_END = '=';
 127         char base64_table[64];
 128         strncpy (base64_table, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/", 64);
 129
 130         while (j < len - 2) {
 131                 buf[i++] = base64_table[bin[j] >> 2];
 132                 buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
 133                 buf[i++] = base64_table[((bin[j + 1] & 15) << 2) | (bin[j + 2] >> 6)];
 134                 buf[i++] = base64_table[bin[j + 2] & 63];
 135                 j += 3;
 136         }
 137
 138         switch (len - j) {
 139         case 1:
 140                 buf[i++] = base64_table[bin[j] >> 2];
 141                 buf[i++] = base64_table[(bin[j] & 3) << 4];
 142                 buf[i++] = BASE64_END;
 143                 buf[i++] = BASE64_END;
 144                 break;
 145         case 2:
 146                 buf[i++] = base64_table[bin[j] >> 2];
 147                 buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
 148                 buf[i++] = base64_table[(bin[j + 1] & 15) << 2];
 149                 buf[i++] = BASE64_END;
 150                 break;
 151         case 0:
 152                 break;
 153         }
 154
 155         buf[i] = '\0';
 156         return buf;
 157 }
 158
 159 int
 160 main (int argc, char **argv)
 161 {
 162         short supports_tls=FALSE;
 163         int n = 0;
 164         double elapsed_time;
 165         long microsec;
 166         int result = STATE_UNKNOWN;
 167         char *cmd_str = NULL;
 168         char *helocmd = NULL;
 169         char *error_msg = NULL;
 170         struct timeval tv;
 171         struct hostent *hp;
 172
 173         setlocale (LC_ALL, "");
 174         bindtextdomain (PACKAGE, LOCALEDIR);
 175         textdomain (PACKAGE);
 176
 177         if (process_arguments (argc, argv) == ERROR)
 178                 usage4 (_("Could not parse arguments"));
 179
 180         /* initialize the HELO command with the localhostname */
 181         if(! localhostname){
 182                 localhostname = malloc (HOST_MAX_BYTES);
 183                 if(!localhostname){
 184                         printf(_("malloc() failed!\n"));
 185                         return STATE_CRITICAL;
 186                 }
 187                 if(gethostname(localhostname, HOST_MAX_BYTES)){
 188                         printf(_("gethostname() failed!\n"));
 189                         return STATE_CRITICAL;
 190                 }
 191                 hp = gethostbyname(localhostname);
 192                 if(!hp) helocmd = localhostname;
 193                 else helocmd = hp->h_name;
 194         } else {
 195                 helocmd = localhostname;
 196         }
 197         if(use_ehlo)
 198                 asprintf (&helocmd, "%s%s%s", SMTP_EHLO, helocmd, "\r\n");
 199         else
 200                 asprintf (&helocmd, "%s%s%s", SMTP_HELO, helocmd, "\r\n");
 201
 202         /* initialize the MAIL command with optional FROM command  */
 203         asprintf (&cmd_str, "%sFROM: %s%s", mail_command, from_arg, "\r\n");
 204
 205         if (verbose && smtp_use_dummycmd)
 206                 printf ("FROM CMD: %s", cmd_str);
 207
 208         /* initialize alarm signal handling */
 209         (void) signal (SIGALRM, socket_timeout_alarm_handler);
 210
 211         /* set socket timeout */
 212         (void) alarm (socket_timeout);
 213
 214         /* start timer */
 215         gettimeofday (&tv, NULL);
 216
 217         /* try to connect to the host at the given port number */
 218         result = my_tcp_connect (server_address, server_port, &sd);
 219
 220         if (result == STATE_OK) { /* we connected */
 221
 222                 /* watch for the SMTP connection string and */
 223                 /* return a WARNING status if we couldn't read any data */
 224                 if (recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0) == -1) {
 225                         printf (_("recv() failed\n"));
 226                         result = STATE_WARNING;
 227                 }
 228                 else {
 229                         if (verbose)
 230                                 printf ("%s", buffer);
 231                         /* strip the buffer of carriage returns */
 232                         strip (buffer);
 233                         /* make sure we find the response we are looking for */
 234                         if (!strstr (buffer, server_expect)) {
 235                                 if (server_port == SMTP_PORT)
 236                                         printf (_("Invalid SMTP response received from host\n"));
 237                                 else
 238                                         printf (_("Invalid SMTP response received from host on port %d\n"),
 239                                                                         server_port);
 240                                 result = STATE_WARNING;
 241                         }
 242                 }
 243
 244                 /* send the HELO/EHLO command */
 245                 send(sd, helocmd, strlen(helocmd), 0);
 246
 247                 /* allow for response to helo command to reach us */
 248                 if(read (sd, buffer, MAXBUF - 1) < 0){
 249                         printf (_("recv() failed\n"));
 250                         return STATE_WARNING;
 251                 } else if(use_ehlo){
 252                         buffer[MAXBUF-1]='\0';
 253                         if(strstr(buffer, "250 STARTTLS") != NULL ||
 254                            strstr(buffer, "250-STARTTLS") != NULL){
 255                                 supports_tls=TRUE;
 256                         }
 257                 }
 258
 259                 if(use_ssl && ! supports_tls){
 260                         printf(_("WARNING - TLS not supported by server\n"));
 261                         send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0);
 262                         return STATE_WARNING;
 263                 }
 264
 265 #ifdef HAVE_SSL
 266                 if(use_ssl) {
 267                   /* send the STARTTLS command */
 268                   send(sd, SMTP_STARTTLS, strlen(SMTP_STARTTLS), 0);
 269
 270                   recv(sd,buffer, MAX_INPUT_BUFFER-1, 0); /* wait for it */
 271                   if (!strstr (buffer, server_expect)) {
 272                     printf (_("Server does not support STARTTLS\n"));
 273                     send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0);
 274                     return STATE_UNKNOWN;
 275                   }
 276                   result = np_net_ssl_init(sd);
 277                   if(result != STATE_OK) {
 278                     printf (_("CRITICAL - Cannot create SSL context.\n"));
 279                     np_net_ssl_cleanup();
 280                     close(sd);
 281                     return STATE_CRITICAL;
 282                   } else {
 283                         ssl_established = 1;
 284                   }
 285 #  ifdef USE_OPENSSL
 286                   if ( check_cert ) {
 287                     result = np_net_ssl_check_cert(days_till_exp);
 288                     if(result != STATE_OK){
 289                       printf (_("CRITICAL - Cannot retrieve server certificate.\n"));
 290                     }
 291                     my_close();
 292                     return result;
 293                   }
 294 #  endif /* USE_OPENSSL */
 295                 }
 296 #endif
 297
 298                 /* sendmail will syslog a "NOQUEUE" error if session does not attempt
 299                  * to do something useful. This can be prevented by giving a command
 300                  * even if syntax is illegal (MAIL requires a FROM:<...> argument)
 301                  *
 302                  * According to rfc821 you can include a null reversepath in the from command
 303                  * - but a log message is generated on the smtp server.
 304                  *
 305                  * You can disable sending mail_command with '--nocommand'
 306                  * Use the -f option to provide a FROM address
 307                  */
 308                 if (smtp_use_dummycmd) {
 309                   my_send(cmd_str, strlen(cmd_str));
 310                   my_recv(buffer, MAX_INPUT_BUFFER-1);
 311                   if (verbose)
 312                     printf("%s", buffer);
 313                 }
 314
 315                 while (n < ncommands) {
 316                         asprintf (&cmd_str, "%s%s", commands[n], "\r\n");
 317                         my_send(cmd_str, strlen(cmd_str));
 318                         my_recv(buffer, MAX_INPUT_BUFFER-1);
 319                         if (verbose)
 320                                 printf("%s", buffer);
 321                         strip (buffer);
 322                         if (n < nresponses) {
 323                                 cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
 324                                 errcode = regcomp (&preg, responses[n], cflags);
 325                                 if (errcode != 0) {
 326                                         regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
 327                                         printf (_("Could Not Compile Regular Expression"));
 328                                         return ERROR;
 329                                 }
 330                                 excode = regexec (&preg, buffer, 10, pmatch, eflags);
 331                                 if (excode == 0) {
 332                                         result = STATE_OK;
 333                                 }
 334                                 else if (excode == REG_NOMATCH) {
 335                                         result = STATE_WARNING;
 336                                         printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]);
 337                                 }
 338                                 else {
 339                                         regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER);
 340                                         printf (_("Execute Error: %s\n"), errbuf);
 341                                         result = STATE_UNKNOWN;
 342                                 }
 343                         }
 344                         n++;
 345                 }
 346
 347                 if (authtype != NULL) {
 348                         if (strcmp (authtype, "LOGIN") == 0) {
 349                                 char *abuf;
 350                                 int ret;
 351                                 do {
 352                                         if (authuser == NULL) {
 353                                                 result = STATE_CRITICAL;
 354                                                 error_msg = _("no authuser specified, ");
 355                                                 break;
 356                                         }
 357                                         if (authpass == NULL) {
 358                                                 result = STATE_CRITICAL;
 359                                                 error_msg = _("no authpass specified, ");
 360                                                 break;
 361                                         }
 362
 363                                         /* send AUTH LOGIN */
 364                                         my_send(SMTP_AUTH_LOGIN, strlen(SMTP_AUTH_LOGIN));
 365                                         if (verbose)
 366                                                 printf (_("sent %s\n"), "AUTH LOGIN");
 367
 368                                         if((ret = my_recv(buffer, MAXBUF - 1)) < 0){
 369                                                 error_msg = _("recv() failed after AUTH LOGIN, \n");
 370                                                 result = STATE_WARNING;
 371                                                 break;
 372                                         }
 373                                         buffer[ret] = 0;
 374                                         if (verbose)
 375                                                 printf (_("received %s\n"), buffer);
 376
 377                                         if (strncmp (buffer, "334", 3) != 0) {
 378                                                 result = STATE_CRITICAL;
 379                                                 error_msg = _("invalid response received after AUTH LOGIN, ");
 380                                                 break;
 381                                         }
 382
 383                                         /* encode authuser with base64 */
 384                                         abuf = base64 (authuser, strlen(authuser));
 385                                         strcat (abuf, "\r\n");
 386                                         my_send(abuf, strlen(abuf));
 387                                         if (verbose)
 388                                                 printf (_("sent %s\n"), abuf);
 389
 390                                         if ((ret = my_recv(buffer, MAX_INPUT_BUFFER-1)) == -1) {
 391                                                 result = STATE_CRITICAL;
 392                                                 error_msg = _("recv() failed after sending authuser, ");
 393                                                 break;
 394                                         }
 395                                         buffer[ret] = 0;
 396                                         if (verbose) {
 397                                                 printf (_("received %s\n"), buffer);
 398                                         }
 399                                         if (strncmp (buffer, "334", 3) != 0) {
 400                                                 result = STATE_CRITICAL;
 401                                                 error_msg = _("invalid response received after authuser, ");
 402                                                 break;
 403                                         }
 404                                         /* encode authpass with base64 */
 405                                         abuf = base64 (authpass, strlen(authpass));
 406                                         strcat (abuf, "\r\n");
 407                                         my_send(abuf, strlen(abuf));
 408                                         if (verbose) {
 409                                                 printf (_("sent %s\n"), abuf);
 410                                         }
 411                                         if ((ret = my_recv(buffer, MAX_INPUT_BUFFER-1)) == -1) {
 412                                                 result = STATE_CRITICAL;
 413                                                 error_msg = _("recv() failed after sending authpass, ");
 414                                                 break;
 415                                         }
 416                                         buffer[ret] = 0;
 417                                         if (verbose) {
 418                                                 printf (_("received %s\n"), buffer);
 419                                         }
 420                                         if (strncmp (buffer, "235", 3) != 0) {
 421                                                 result = STATE_CRITICAL;
 422                                                 error_msg = _("invalid response received after authpass, ");
 423                                                 break;
 424                                         }
 425                                         break;
 426                                 } while (0);
 427                         } else {
 428                                 result = STATE_CRITICAL;
 429                                 error_msg = _("only authtype LOGIN is supported, ");
 430                         }
 431                 }
 432
 433                 /* tell the server we're done */
 434                 my_send (SMTP_QUIT, strlen (SMTP_QUIT));
 435
 436                 /* finally close the connection */
 437                 close (sd);
 438         }
 439
 440         /* reset the alarm */
 441         alarm (0);
 442
 443         microsec = deltime (tv);
 444         elapsed_time = (double)microsec / 1.0e6;
 445
 446         if (result == STATE_OK) {
 447                 if (check_critical_time && elapsed_time > (double) critical_time)
 448                         result = STATE_CRITICAL;
 449                 else if (check_warning_time && elapsed_time > (double) warning_time)
 450                         result = STATE_WARNING;
 451         }
 452
 453         printf (_("SMTP %s - %s%.3f sec. response time%s%s|%s\n"),
 454                         state_text (result),
 455                         (error_msg == NULL ? "" : error_msg),
 456                         elapsed_time,
 457                         verbose?", ":"", verbose?buffer:"",
 458                         fperfdata ("time", elapsed_time, "s",
 459                                 (int)check_warning_time, warning_time,
 460                                 (int)check_critical_time, critical_time,
 461                                 TRUE, 0, FALSE, 0));
 462
 463         return result;
 464 }
 465
 466
 467
 468 /* process command-line arguments */
 469 int
 470 process_arguments (int argc, char **argv)
 471 {
 472         int c;
 473
 474         int option = 0;
 475         static struct option longopts[] = {
 476                 {"hostname", required_argument, 0, 'H'},
 477                 {"expect", required_argument, 0, 'e'},
 478                 {"critical", required_argument, 0, 'c'},
 479                 {"warning", required_argument, 0, 'w'},
 480                 {"timeout", required_argument, 0, 't'},
 481                 {"port", required_argument, 0, 'p'},
 482                 {"from", required_argument, 0, 'f'},
 483                 {"fqdn", required_argument, 0, 'F'},
 484                 {"authtype", required_argument, 0, 'A'},
 485                 {"authuser", required_argument, 0, 'U'},
 486                 {"authpass", required_argument, 0, 'P'},
 487                 {"command", required_argument, 0, 'C'},
 488                 {"response", required_argument, 0, 'R'},
 489                 {"nocommand", required_argument, 0, 'n'},
 490                 {"verbose", no_argument, 0, 'v'},
 491                 {"version", no_argument, 0, 'V'},
 492                 {"use-ipv4", no_argument, 0, '4'},
 493                 {"use-ipv6", no_argument, 0, '6'},
 494                 {"help", no_argument, 0, 'h'},
 495                 {"starttls",no_argument,0,'S'},
 496                 {"certificate",required_argument,0,'D'},
 497                 {0, 0, 0, 0}
 498         };
 499
 500         if (argc < 2)
 501                 return ERROR;
 502
 503         for (c = 1; c < argc; c++) {
 504                 if (strcmp ("-to", argv[c]) == 0)
 505                         strcpy (argv[c], "-t");
 506                 else if (strcmp ("-wt", argv[c]) == 0)
 507                         strcpy (argv[c], "-w");
 508                 else if (strcmp ("-ct", argv[c]) == 0)
 509                         strcpy (argv[c], "-c");
 510         }
 511
 512         while (1) {
 513                 c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:R:SD:F:A:U:P:",
 514                                  longopts, &option);
 515
 516                 if (c == -1 || c == EOF)
 517                         break;
 518
 519                 switch (c) {
 520                 case 'H':                                                                       /* hostname */
 521                         if (is_host (optarg)) {
 522                                 server_address = optarg;
 523                         }
 524                         else {
 525                                 usage2 (_("Invalid hostname/address"), optarg);
 526                         }
 527                         break;
 528                 case 'p':                                                                       /* port */
 529                         if (is_intpos (optarg))
 530                                 server_port = atoi (optarg);
 531                         else
 532                                 usage4 (_("Port must be a positive integer"));
 533                         break;
 534                 case 'F':
 535                 /* localhostname */
 536                         localhostname = strdup(optarg);
 537                         break;
 538                 case 'f':                                                                       /* from argument */
 539                         from_arg = optarg;
 540                         smtp_use_dummycmd = 1;
 541                         break;
 542                 case 'A':
 543                         authtype = optarg;
 544                         break;
 545                 case 'U':
 546                         authuser = optarg;
 547                         break;
 548                 case 'P':
 549                         authpass = optarg;
 550                         break;
 551                 case 'e':                                                                       /* server expect string on 220  */
 552                         server_expect = optarg;
 553                         break;
 554                 case 'C':                                                                       /* commands  */
 555                         if (ncommands >= command_size) {
 556                                 commands = realloc (commands, command_size+8);
 557                                 if (commands == NULL)
 558                                         die (STATE_UNKNOWN,
 559                                              _("Could not realloc() units [%d]\n"), ncommands);
 560                         }
 561                         commands[ncommands] = optarg;
 562                         ncommands++;
 563                         break;
 564                 case 'R':                                                                       /* server responses */
 565                         if (nresponses >= response_size) {
 566                                 responses = realloc (responses, response_size+8);
 567                                 if (responses == NULL)
 568                                         die (STATE_UNKNOWN,
 569                                              _("Could not realloc() units [%d]\n"), nresponses);
 570                         }
 571                         responses[nresponses] = optarg;
 572                         nresponses++;
 573                         break;
 574                 case 'c':                                                                       /* critical time threshold */
 575                         if (is_intnonneg (optarg)) {
 576                                 critical_time = atoi (optarg);
 577                                 check_critical_time = TRUE;
 578                         }
 579                         else {
 580                                 usage4 (_("Critical time must be a positive integer"));
 581                         }
 582                         break;
 583                 case 'w':                                                                       /* warning time threshold */
 584                         if (is_intnonneg (optarg)) {
 585                                 warning_time = atoi (optarg);
 586                                 check_warning_time = TRUE;
 587                         }
 588                         else {
 589                                 usage4 (_("Warning time must be a positive integer"));
 590                         }
 591                         break;
 592                 case 'v':                                                                       /* verbose */
 593                         verbose++;
 594                         break;
 595                 case 't':                                                                       /* timeout */
 596                         if (is_intnonneg (optarg)) {
 597                                 socket_timeout = atoi (optarg);
 598                         }
 599                         else {
 600                                 usage4 (_("Timeout interval must be a positive integer"));
 601                         }
 602                         break;
 603                 case 'S':
 604                 /* starttls */
 605                         use_ssl = TRUE;
 606                         use_ehlo = TRUE;
 607                         break;
 608                 case 'D':
 609                 /* Check SSL cert validity */
 610 #ifdef USE_OPENSSL
 611                         if (!is_intnonneg (optarg))
 612                                 usage2 ("Invalid certificate expiration period",optarg);
 613                                 days_till_exp = atoi (optarg);
 614                                 check_cert = TRUE;
 615 #else
 616                                 usage (_("SSL support not available - install OpenSSL and recompile"));
 617 #endif
 618                         break;
 619                 case '4':
 620                         address_family = AF_INET;
 621                         break;
 622                 case '6':
 623 #ifdef USE_IPV6
 624                         address_family = AF_INET6;
 625 #else
 626                         usage4 (_("IPv6 support not available"));
 627 #endif
 628                         break;
 629                 case 'V':                                                                       /* version */
 630                         print_revision (progname, revision);
 631                         exit (STATE_OK);
 632                 case 'h':                                                                       /* help */
 633                         print_help ();
 634                         exit (STATE_OK);
 635                 case '?':                                                                       /* help */
 636                         usage2 (_("Unknown argument"), optarg);
 637                 }
 638         }
 639
 640         c = optind;
 641         if (server_address == NULL) {
 642                 if (argv[c]) {
 643                         if (is_host (argv[c]))
 644                                 server_address = argv[c];
 645                         else
 646                                 usage2 (_("Invalid hostname/address"), argv[c]);
 647                 }
 648                 else {
 649                         asprintf (&server_address, "127.0.0.1");
 650                 }
 651         }
 652
 653         if (server_expect == NULL)
 654                 server_expect = strdup (SMTP_EXPECT);
 655
 656         if (mail_command == NULL)
 657                 mail_command = strdup("MAIL ");
 658
 659         if (from_arg==NULL)
 660                 from_arg = strdup(" ");
 661
 662         return validate_arguments ();
 663 }
 664
 665
 666
 667 int
 668 validate_arguments (void)
 669 {
 670         return OK;
 671 }
 672
 673
 674 int
 675 my_close (void)
 676 {
 677 #ifdef HAVE_SSL
 678   np_net_ssl_cleanup();
 679 #endif
 680   return close(sd);
 681 }
 682
 683
 684 void
 685 print_help (void)
 686 {
 687         char *myport;
 688         asprintf (&myport, "%d", SMTP_PORT);
 689
 690         print_revision (progname, revision);
 691
 692         printf ("Copyright (c) 1999-2001 Ethan Galstad <nagios@nagios.org>\n");
 693         printf (COPYRIGHT, copyright, email);
 694
 695         printf("%s\n", _("This plugin will attempt to open an SMTP connection with the host."));
 696
 697   printf ("\n\n");
 698
 699         print_usage ();
 700
 701         printf (_(UT_HELP_VRSN));
 702
 703         printf (_(UT_HOST_PORT), 'p', myport);
 704
 705         printf (_(UT_IPv46));
 706
 707         printf (" %s\n", "-e, --expect=STRING");
 708   printf (_("String to expect in first line of server response (default: '%s')"),SMTP_EXPECT);
 709   printf (" %s\n\n", "-n, nocommand\n");
 710   printf ("    %s\n", _("Suppress SMTP command"));
 711   printf (" %s\n", "-C, --command=STRING");
 712   printf ("    %s\n", _("SMTP command (may be used repeatedly)"));
 713   printf (" %s\n", "-R, --command=STRING");
 714   printf ("    %s\n", _("Expected response to command (may be used repeatedly)"));
 715   printf (" %s\n", "-f, --from=STRING");
 716   printf ("    %s\n", _("FROM-address to include in MAIL command, required by Exchange 2000")),
 717 #ifdef HAVE_SSL
 718   printf (" %s\n", "-D, --certificate=INTEGER");
 719   printf ("    %s\n", _("Minimum number of days a certificate has to be valid."));
 720   printf (" %s\n", "-S, --starttls");
 721   printf ("    %s\n", _("Use STARTTLS for the connection."));
 722 #endif
 723
 724         printf (" %s\n", "-A, --authtype=STRING");
 725   printf ("    %s\n", _("SMTP AUTH type to check (default none, only LOGIN supported)"));
 726   printf (" %s\n", "-U, --authuser=STRING");
 727   printf ("    %s\n", _("SMTP AUTH username"));
 728   printf (" %s\n", "-P, --authpass=STRING");
 729   printf ("    %s\n", _("SMTP AUTH password"));
 730
 731         printf (_(UT_WARN_CRIT));
 732
 733         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 734
 735         printf (_(UT_VERBOSE));
 736
 737         printf ("%s\n", _("Successul connects return STATE_OK, refusals and timeouts return"));
 738   printf ("%s\n", _("STATE_CRITICAL, other errors return STATE_UNKNOWN.  Successful"));
 739   printf ("%s\n", _("connects, but incorrect reponse messages from the host result in"));
 740   printf ("%s\n", _("STATE_WARNING return values."));
 741
 742         printf (_(UT_SUPPORT));
 743 }
 744
 745
 746
 747 void
 748 print_usage (void)
 749 {
 750   printf (_("Usage:"));
 751         printf ("%s -H host [-p port] [-e expect] [-C command] [-f from addr]\n\
 752                   [-A authtype -U authuser -P authpass]\n\
 753                   [-w warn] [-c crit] [-t timeout] [-S] [-D days] [-n] [-v] [-4|-6]\n", progname);
 754 }
 755