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 *  This plugin will attempt to open an SMTP connection with the host.
  15 *
  16 *
  17 * License Information:
  18 *
  19 * This program is free software; you can redistribute it and/or modify
  20 * it under the terms of the GNU General Public License as published by
  21 * the Free Software Foundation; either version 2 of the License, or
  22 * (at your option) any later version.
  23 *
  24 * This program is distributed in the hope that it will be useful,
  25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27 * GNU General Public License for more details.
  28 *
  29 * You should have received a copy of the GNU General Public License
  30 * along with this program; if not, write to the Free Software
  31 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  32 *
  33 *
  34 * $Id$
  35 *
  36 ******************************************************************************/
  37
  38 const char *progname = "check_smtp";
  39 const char *revision = "$Revision$";
  40 const char *copyright = "2000-2006";
  41 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  42
  43 #include "common.h"
  44 #include "netutils.h"
  45 #include "utils.h"
  46
  47 #ifdef HAVE_SSL
  48 int check_cert = FALSE;
  49 int days_till_exp;
  50 #  define my_recv(buf, len) ((use_ssl && ssl_established) ? np_net_ssl_read(buf, len) : read(sd, buf, len))
  51 #  define my_send(buf, len) ((use_ssl && ssl_established) ? np_net_ssl_write(buf, len) : send(sd, buf, len, 0))
  52 #else /* ifndef HAVE_SSL */
  53 #  define my_recv(buf, len) read(sd, buf, len)
  54 #  define my_send(buf, len) send(sd, buf, len, 0)
  55 #endif
  56
  57 enum {
  58         SMTP_PORT       = 25
  59 };
  60 #define SMTP_EXPECT "220"
  61 #define SMTP_HELO "HELO "
  62 #define SMTP_EHLO "EHLO "
  63 #define SMTP_QUIT "QUIT\r\n"
  64 #define SMTP_STARTTLS "STARTTLS\r\n"
  65 #define SMTP_AUTH_LOGIN "AUTH LOGIN\r\n"
  66
  67 #ifndef HOST_MAX_BYTES
  68 #define HOST_MAX_BYTES 255
  69 #endif
  70
  71 #define EHLO_SUPPORTS_STARTTLS 1
  72
  73 int process_arguments (int, char **);
  74 int validate_arguments (void);
  75 void print_help (void);
  76 void print_usage (void);
  77 int my_close(void);
  78
  79 #include "regex.h"
  80 char regex_expect[MAX_INPUT_BUFFER] = "";
  81 regex_t preg;
  82 regmatch_t pmatch[10];
  83 char timestamp[20] = "";
  84 char errbuf[MAX_INPUT_BUFFER];
  85 int cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
  86 int eflags = 0;
  87 int errcode, excode;
  88
  89 int server_port = SMTP_PORT;
  90 char *server_address = NULL;
  91 char *server_expect = NULL;
  92 int smtp_use_dummycmd = 0;
  93 char *mail_command = NULL;
  94 char *from_arg = NULL;
  95 int ncommands=0;
  96 int command_size=0;
  97 int nresponses=0;
  98 int response_size=0;
  99 char **commands = NULL;
 100 char **responses = NULL;
 101 char *authtype = NULL;
 102 char *authuser = NULL;
 103 char *authpass = NULL;
 104 int warning_time = 0;
 105 int check_warning_time = FALSE;
 106 int critical_time = 0;
 107 int check_critical_time = FALSE;
 108 int verbose = 0;
 109 int use_ssl = FALSE;
 110 short use_ehlo = FALSE;
 111 short ssl_established = 0;
 112 char *localhostname = NULL;
 113 int sd;
 114 char buffer[MAX_INPUT_BUFFER];
 115 enum {
 116   TCP_PROTOCOL = 1,
 117   UDP_PROTOCOL = 2,
 118   MAXBUF = 1024
 119 };
 120
 121 /* written by lauri alanko */
 122 static char *
 123 base64 (const char *bin, size_t len)
 124 {
 125
 126         char *buf = (char *) malloc ((len + 2) / 3 * 4 + 1);
 127         size_t i = 0, j = 0;
 128
 129         char BASE64_END = '=';
 130         char base64_table[64];
 131         strncpy (base64_table, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/", 64);
 132
 133         while (j < len - 2) {
 134                 buf[i++] = base64_table[bin[j] >> 2];
 135                 buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
 136                 buf[i++] = base64_table[((bin[j + 1] & 15) << 2) | (bin[j + 2] >> 6)];
 137                 buf[i++] = base64_table[bin[j + 2] & 63];
 138                 j += 3;
 139         }
 140
 141         switch (len - j) {
 142         case 1:
 143                 buf[i++] = base64_table[bin[j] >> 2];
 144                 buf[i++] = base64_table[(bin[j] & 3) << 4];
 145                 buf[i++] = BASE64_END;
 146                 buf[i++] = BASE64_END;
 147                 break;
 148         case 2:
 149                 buf[i++] = base64_table[bin[j] >> 2];
 150                 buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
 151                 buf[i++] = base64_table[(bin[j + 1] & 15) << 2];
 152                 buf[i++] = BASE64_END;
 153                 break;
 154         case 0:
 155                 break;
 156         }
 157
 158         buf[i] = '\0';
 159         return buf;
 160 }
 161
 162 int
 163 main (int argc, char **argv)
 164 {
 165         short supports_tls=FALSE;
 166         int n = 0;
 167         double elapsed_time;
 168         long microsec;
 169         int result = STATE_UNKNOWN;
 170         char *cmd_str = NULL;
 171         char *helocmd = NULL;
 172         char *error_msg = NULL;
 173         struct timeval tv;
 174
 175         setlocale (LC_ALL, "");
 176         bindtextdomain (PACKAGE, LOCALEDIR);
 177         textdomain (PACKAGE);
 178
 179         if (process_arguments (argc, argv) == ERROR)
 180                 usage4 (_("Could not parse arguments"));
 181
 182         /* initialize the HELO command with the localhostname */
 183         if(! localhostname){
 184                 localhostname = malloc (HOST_MAX_BYTES);
 185                 if(!localhostname){
 186                         printf(_("malloc() failed!\n"));
 187                         return STATE_CRITICAL;
 188                 }
 189                 if(gethostname(localhostname, HOST_MAX_BYTES)){
 190                         printf(_("gethostname() failed!\n"));
 191                         return STATE_CRITICAL;
 192                 }
 193         } else {
 194                 helocmd = localhostname;
 195         }
 196         if(use_ehlo)
 197                 asprintf (&helocmd, "%s%s%s", SMTP_EHLO, helocmd, "\r\n");
 198         else
 199                 asprintf (&helocmd, "%s%s%s", SMTP_HELO, helocmd, "\r\n");
 200
 201         if (verbose)
 202                 printf("HELOCMD: %s", helocmd);
 203
 204         /* initialize the MAIL command with optional FROM command  */
 205         asprintf (&cmd_str, "%sFROM: %s%s", mail_command, from_arg, "\r\n");
 206
 207         if (verbose && smtp_use_dummycmd)
 208                 printf ("FROM CMD: %s", cmd_str);
 209
 210         /* initialize alarm signal handling */
 211         (void) signal (SIGALRM, socket_timeout_alarm_handler);
 212
 213         /* set socket timeout */
 214         (void) alarm (socket_timeout);
 215
 216         /* start timer */
 217         gettimeofday (&tv, NULL);
 218
 219         /* try to connect to the host at the given port number */
 220         result = my_tcp_connect (server_address, server_port, &sd);
 221
 222         if (result == STATE_OK) { /* we connected */
 223
 224                 /* watch for the SMTP connection string and */
 225                 /* return a WARNING status if we couldn't read any data */
 226                 if (recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0) == -1) {
 227                         printf (_("recv() failed\n"));
 228                         result = STATE_WARNING;
 229                 }
 230                 else {
 231                         if (verbose)
 232                                 printf ("%s", buffer);
 233                         /* strip the buffer of carriage returns */
 234                         strip (buffer);
 235                         /* make sure we find the response we are looking for */
 236                         if (!strstr (buffer, server_expect)) {
 237                                 if (server_port == SMTP_PORT)
 238                                         printf (_("Invalid SMTP response received from host\n"));
 239                                 else
 240                                         printf (_("Invalid SMTP response received from host on port %d\n"),
 241                                                                         server_port);
 242                                 result = STATE_WARNING;
 243                         }
 244                 }
 245
 246                 /* send the HELO/EHLO command */
 247                 send(sd, helocmd, strlen(helocmd), 0);
 248
 249                 /* allow for response to helo command to reach us */
 250                 if(read (sd, buffer, MAXBUF - 1) < 0){
 251                         printf (_("recv() failed\n"));
 252                         return STATE_WARNING;
 253                 } else if(use_ehlo){
 254                         buffer[MAXBUF-1]='\0';
 255                         if(strstr(buffer, "250 STARTTLS") != NULL ||
 256                            strstr(buffer, "250-STARTTLS") != NULL){
 257                                 supports_tls=TRUE;
 258                         }
 259                 }
 260
 261                 if(use_ssl && ! supports_tls){
 262                         printf(_("WARNING - TLS not supported by server\n"));
 263                         send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0);
 264                         return STATE_WARNING;
 265                 }
 266
 267 #ifdef HAVE_SSL
 268                 if(use_ssl) {
 269                   /* send the STARTTLS command */
 270                   send(sd, SMTP_STARTTLS, strlen(SMTP_STARTTLS), 0);
 271
 272                   recv(sd,buffer, MAX_INPUT_BUFFER-1, 0); /* wait for it */
 273                   if (!strstr (buffer, server_expect)) {
 274                     printf (_("Server does not support STARTTLS\n"));
 275                     send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0);
 276                     return STATE_UNKNOWN;
 277                   }
 278                   result = np_net_ssl_init(sd);
 279                   if(result != STATE_OK) {
 280                     printf (_("CRITICAL - Cannot create SSL context.\n"));
 281                     np_net_ssl_cleanup();
 282                     close(sd);
 283                     return STATE_CRITICAL;
 284                   } else {
 285                         ssl_established = 1;
 286                   }
 287
 288                 /*
 289                  * Resend the EHLO command.
 290                  *
 291                  * RFC 3207 (4.2) says: ``The client MUST discard any knowledge
 292                  * obtained from the server, such as the list of SMTP service
 293                  * extensions, which was not obtained from the TLS negotiation
 294                  * itself.  The client SHOULD send an EHLO command as the first
 295                  * command after a successful TLS negotiation.''  For this
 296                  * reason, some MTAs will not allow an AUTH LOGIN command before
 297                  * we resent EHLO via TLS.
 298                  */
 299                 if (my_send(helocmd, strlen(helocmd)) <= 0) {
 300                         printf(_("SMTP UNKNOWN - Cannot send EHLO command via TLS.\n"));
 301                         my_close();
 302                         return STATE_UNKNOWN;
 303                 }
 304                 if (verbose)
 305                         printf(_("sent %s"), helocmd);
 306                 if ((n = my_recv(buffer, MAX_INPUT_BUFFER - 1)) <= 0) {
 307                         printf(_("SMTP UNKNOWN - Cannot read EHLO response via TLS.\n"));
 308                         my_close();
 309                         return STATE_UNKNOWN;
 310                 }
 311                 if (verbose) {
 312                         buffer[n] = '\0';
 313                         printf("%s", buffer);
 314                 }
 315
 316 #  ifdef USE_OPENSSL
 317                   if ( check_cert ) {
 318                     result = np_net_ssl_check_cert(days_till_exp);
 319                     if(result != STATE_OK){
 320                       printf (_("CRITICAL - Cannot retrieve server certificate.\n"));
 321                     }
 322                     my_close();
 323                     return result;
 324                   }
 325 #  endif /* USE_OPENSSL */
 326                 }
 327 #endif
 328
 329                 /* sendmail will syslog a "NOQUEUE" error if session does not attempt
 330                  * to do something useful. This can be prevented by giving a command
 331                  * even if syntax is illegal (MAIL requires a FROM:<...> argument)
 332                  *
 333                  * According to rfc821 you can include a null reversepath in the from command
 334                  * - but a log message is generated on the smtp server.
 335                  *
 336                  * You can disable sending mail_command with '--nocommand'
 337                  * Use the -f option to provide a FROM address
 338                  */
 339                 if (smtp_use_dummycmd) {
 340                   my_send(cmd_str, strlen(cmd_str));
 341                   my_recv(buffer, MAX_INPUT_BUFFER-1);
 342                   if (verbose)
 343                     printf("%s", buffer);
 344                 }
 345
 346                 while (n < ncommands) {
 347                         asprintf (&cmd_str, "%s%s", commands[n], "\r\n");
 348                         my_send(cmd_str, strlen(cmd_str));
 349                         my_recv(buffer, MAX_INPUT_BUFFER-1);
 350                         if (verbose)
 351                                 printf("%s", buffer);
 352                         strip (buffer);
 353                         if (n < nresponses) {
 354                                 cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
 355                                 errcode = regcomp (&preg, responses[n], cflags);
 356                                 if (errcode != 0) {
 357                                         regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
 358                                         printf (_("Could Not Compile Regular Expression"));
 359                                         return ERROR;
 360                                 }
 361                                 excode = regexec (&preg, buffer, 10, pmatch, eflags);
 362                                 if (excode == 0) {
 363                                         result = STATE_OK;
 364                                 }
 365                                 else if (excode == REG_NOMATCH) {
 366                                         result = STATE_WARNING;
 367                                         printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]);
 368                                 }
 369                                 else {
 370                                         regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER);
 371                                         printf (_("Execute Error: %s\n"), errbuf);
 372                                         result = STATE_UNKNOWN;
 373                                 }
 374                         }
 375                         n++;
 376                 }
 377
 378                 if (authtype != NULL) {
 379                         if (strcmp (authtype, "LOGIN") == 0) {
 380                                 char *abuf;
 381                                 int ret;
 382                                 do {
 383                                         if (authuser == NULL) {
 384                                                 result = STATE_CRITICAL;
 385                                                 error_msg = _("no authuser specified, ");
 386                                                 break;
 387                                         }
 388                                         if (authpass == NULL) {
 389                                                 result = STATE_CRITICAL;
 390                                                 error_msg = _("no authpass specified, ");
 391                                                 break;
 392                                         }
 393
 394                                         /* send AUTH LOGIN */
 395                                         my_send(SMTP_AUTH_LOGIN, strlen(SMTP_AUTH_LOGIN));
 396                                         if (verbose)
 397                                                 printf (_("sent %s\n"), "AUTH LOGIN");
 398
 399                                         if((ret = my_recv(buffer, MAXBUF - 1)) < 0){
 400                                                 error_msg = _("recv() failed after AUTH LOGIN, \n");
 401                                                 result = STATE_WARNING;
 402                                                 break;
 403                                         }
 404                                         buffer[ret] = 0;
 405                                         if (verbose)
 406                                                 printf (_("received %s\n"), buffer);
 407
 408                                         if (strncmp (buffer, "334", 3) != 0) {
 409                                                 result = STATE_CRITICAL;
 410                                                 error_msg = _("invalid response received after AUTH LOGIN, ");
 411                                                 break;
 412                                         }
 413
 414                                         /* encode authuser with base64 */
 415                                         abuf = base64 (authuser, strlen(authuser));
 416                                         strcat (abuf, "\r\n");
 417                                         my_send(abuf, strlen(abuf));
 418                                         if (verbose)
 419                                                 printf (_("sent %s\n"), abuf);
 420
 421                                         if ((ret = my_recv(buffer, MAX_INPUT_BUFFER-1)) == -1) {
 422                                                 result = STATE_CRITICAL;
 423                                                 error_msg = _("recv() failed after sending authuser, ");
 424                                                 break;
 425                                         }
 426                                         buffer[ret] = 0;
 427                                         if (verbose) {
 428                                                 printf (_("received %s\n"), buffer);
 429                                         }
 430                                         if (strncmp (buffer, "334", 3) != 0) {
 431                                                 result = STATE_CRITICAL;
 432                                                 error_msg = _("invalid response received after authuser, ");
 433                                                 break;
 434                                         }
 435                                         /* encode authpass with base64 */
 436                                         abuf = base64 (authpass, strlen(authpass));
 437                                         strcat (abuf, "\r\n");
 438                                         my_send(abuf, strlen(abuf));
 439                                         if (verbose) {
 440                                                 printf (_("sent %s\n"), abuf);
 441                                         }
 442                                         if ((ret = my_recv(buffer, MAX_INPUT_BUFFER-1)) == -1) {
 443                                                 result = STATE_CRITICAL;
 444                                                 error_msg = _("recv() failed after sending authpass, ");
 445                                                 break;
 446                                         }
 447                                         buffer[ret] = 0;
 448                                         if (verbose) {
 449                                                 printf (_("received %s\n"), buffer);
 450                                         }
 451                                         if (strncmp (buffer, "235", 3) != 0) {
 452                                                 result = STATE_CRITICAL;
 453                                                 error_msg = _("invalid response received after authpass, ");
 454                                                 break;
 455                                         }
 456                                         break;
 457                                 } while (0);
 458                         } else {
 459                                 result = STATE_CRITICAL;
 460                                 error_msg = _("only authtype LOGIN is supported, ");
 461                         }
 462                 }
 463
 464                 /* tell the server we're done */
 465                 my_send (SMTP_QUIT, strlen (SMTP_QUIT));
 466
 467                 /* finally close the connection */
 468                 close (sd);
 469         }
 470
 471         /* reset the alarm */
 472         alarm (0);
 473
 474         microsec = deltime (tv);
 475         elapsed_time = (double)microsec / 1.0e6;
 476
 477         if (result == STATE_OK) {
 478                 if (check_critical_time && elapsed_time > (double) critical_time)
 479                         result = STATE_CRITICAL;
 480                 else if (check_warning_time && elapsed_time > (double) warning_time)
 481                         result = STATE_WARNING;
 482         }
 483
 484         printf (_("SMTP %s - %s%.3f sec. response time%s%s|%s\n"),
 485                         state_text (result),
 486                         (error_msg == NULL ? "" : error_msg),
 487                         elapsed_time,
 488                         verbose?", ":"", verbose?buffer:"",
 489                         fperfdata ("time", elapsed_time, "s",
 490                                 (int)check_warning_time, warning_time,
 491                                 (int)check_critical_time, critical_time,
 492                                 TRUE, 0, FALSE, 0));
 493
 494         return result;
 495 }
 496
 497
 498
 499 /* process command-line arguments */
 500 int
 501 process_arguments (int argc, char **argv)
 502 {
 503         int c;
 504
 505         int option = 0;
 506         static struct option longopts[] = {
 507                 {"hostname", required_argument, 0, 'H'},
 508                 {"expect", required_argument, 0, 'e'},
 509                 {"critical", required_argument, 0, 'c'},
 510                 {"warning", required_argument, 0, 'w'},
 511                 {"timeout", required_argument, 0, 't'},
 512                 {"port", required_argument, 0, 'p'},
 513                 {"from", required_argument, 0, 'f'},
 514                 {"fqdn", required_argument, 0, 'F'},
 515                 {"authtype", required_argument, 0, 'A'},
 516                 {"authuser", required_argument, 0, 'U'},
 517                 {"authpass", required_argument, 0, 'P'},
 518                 {"command", required_argument, 0, 'C'},
 519                 {"response", required_argument, 0, 'R'},
 520                 {"nocommand", required_argument, 0, 'n'},
 521                 {"verbose", no_argument, 0, 'v'},
 522                 {"version", no_argument, 0, 'V'},
 523                 {"use-ipv4", no_argument, 0, '4'},
 524                 {"use-ipv6", no_argument, 0, '6'},
 525                 {"help", no_argument, 0, 'h'},
 526                 {"starttls",no_argument,0,'S'},
 527                 {"certificate",required_argument,0,'D'},
 528                 {0, 0, 0, 0}
 529         };
 530
 531         if (argc < 2)
 532                 return ERROR;
 533
 534         for (c = 1; c < argc; c++) {
 535                 if (strcmp ("-to", argv[c]) == 0)
 536                         strcpy (argv[c], "-t");
 537                 else if (strcmp ("-wt", argv[c]) == 0)
 538                         strcpy (argv[c], "-w");
 539                 else if (strcmp ("-ct", argv[c]) == 0)
 540                         strcpy (argv[c], "-c");
 541         }
 542
 543         while (1) {
 544                 c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:R:SD:F:A:U:P:",
 545                                  longopts, &option);
 546
 547                 if (c == -1 || c == EOF)
 548                         break;
 549
 550                 switch (c) {
 551                 case 'H':                                                                       /* hostname */
 552                         if (is_host (optarg)) {
 553                                 server_address = optarg;
 554                         }
 555                         else {
 556                                 usage2 (_("Invalid hostname/address"), optarg);
 557                         }
 558                         break;
 559                 case 'p':                                                                       /* port */
 560                         if (is_intpos (optarg))
 561                                 server_port = atoi (optarg);
 562                         else
 563                                 usage4 (_("Port must be a positive integer"));
 564                         break;
 565                 case 'F':
 566                 /* localhostname */
 567                         localhostname = strdup(optarg);
 568                         break;
 569                 case 'f':                                                                       /* from argument */
 570                         from_arg = optarg;
 571                         smtp_use_dummycmd = 1;
 572                         break;
 573                 case 'A':
 574                         authtype = optarg;
 575                         break;
 576                 case 'U':
 577                         authuser = optarg;
 578                         break;
 579                 case 'P':
 580                         authpass = optarg;
 581                         break;
 582                 case 'e':                                                                       /* server expect string on 220  */
 583                         server_expect = optarg;
 584                         break;
 585                 case 'C':                                                                       /* commands  */
 586                         if (ncommands >= command_size) {
 587                                 commands = realloc (commands, command_size+8);
 588                                 if (commands == NULL)
 589                                         die (STATE_UNKNOWN,
 590                                              _("Could not realloc() units [%d]\n"), ncommands);
 591                         }
 592                         commands[ncommands] = optarg;
 593                         ncommands++;
 594                         break;
 595                 case 'R':                                                                       /* server responses */
 596                         if (nresponses >= response_size) {
 597                                 responses = realloc (responses, response_size+8);
 598                                 if (responses == NULL)
 599                                         die (STATE_UNKNOWN,
 600                                              _("Could not realloc() units [%d]\n"), nresponses);
 601                         }
 602                         responses[nresponses] = optarg;
 603                         nresponses++;
 604                         break;
 605                 case 'c':                                                                       /* critical time threshold */
 606                         if (is_intnonneg (optarg)) {
 607                                 critical_time = atoi (optarg);
 608                                 check_critical_time = TRUE;
 609                         }
 610                         else {
 611                                 usage4 (_("Critical time must be a positive integer"));
 612                         }
 613                         break;
 614                 case 'w':                                                                       /* warning time threshold */
 615                         if (is_intnonneg (optarg)) {
 616                                 warning_time = atoi (optarg);
 617                                 check_warning_time = TRUE;
 618                         }
 619                         else {
 620                                 usage4 (_("Warning time must be a positive integer"));
 621                         }
 622                         break;
 623                 case 'v':                                                                       /* verbose */
 624                         verbose++;
 625                         break;
 626                 case 't':                                                                       /* timeout */
 627                         if (is_intnonneg (optarg)) {
 628                                 socket_timeout = atoi (optarg);
 629                         }
 630                         else {
 631                                 usage4 (_("Timeout interval must be a positive integer"));
 632                         }
 633                         break;
 634                 case 'S':
 635                 /* starttls */
 636                         use_ssl = TRUE;
 637                         use_ehlo = TRUE;
 638                         break;
 639                 case 'D':
 640                 /* Check SSL cert validity */
 641 #ifdef USE_OPENSSL
 642                         if (!is_intnonneg (optarg))
 643                                 usage2 ("Invalid certificate expiration period",optarg);
 644                                 days_till_exp = atoi (optarg);
 645                                 check_cert = TRUE;
 646 #else
 647                                 usage (_("SSL support not available - install OpenSSL and recompile"));
 648 #endif
 649                         break;
 650                 case '4':
 651                         address_family = AF_INET;
 652                         break;
 653                 case '6':
 654 #ifdef USE_IPV6
 655                         address_family = AF_INET6;
 656 #else
 657                         usage4 (_("IPv6 support not available"));
 658 #endif
 659                         break;
 660                 case 'V':                                                                       /* version */
 661                         print_revision (progname, revision);
 662                         exit (STATE_OK);
 663                 case 'h':                                                                       /* help */
 664                         print_help ();
 665                         exit (STATE_OK);
 666                 case '?':                                                                       /* help */
 667                         usage2 (_("Unknown argument"), optarg);
 668                 }
 669         }
 670
 671         c = optind;
 672         if (server_address == NULL) {
 673                 if (argv[c]) {
 674                         if (is_host (argv[c]))
 675                                 server_address = argv[c];
 676                         else
 677                                 usage2 (_("Invalid hostname/address"), argv[c]);
 678                 }
 679                 else {
 680                         asprintf (&server_address, "127.0.0.1");
 681                 }
 682         }
 683
 684         if (server_expect == NULL)
 685                 server_expect = strdup (SMTP_EXPECT);
 686
 687         if (mail_command == NULL)
 688                 mail_command = strdup("MAIL ");
 689
 690         if (from_arg==NULL)
 691                 from_arg = strdup(" ");
 692
 693         return validate_arguments ();
 694 }
 695
 696
 697
 698 int
 699 validate_arguments (void)
 700 {
 701         return OK;
 702 }
 703
 704
 705 int
 706 my_close (void)
 707 {
 708 #ifdef HAVE_SSL
 709   np_net_ssl_cleanup();
 710 #endif
 711   return close(sd);
 712 }
 713
 714
 715 void
 716 print_help (void)
 717 {
 718         char *myport;
 719         asprintf (&myport, "%d", SMTP_PORT);
 720
 721         print_revision (progname, revision);
 722
 723         printf ("Copyright (c) 1999-2001 Ethan Galstad <nagios@nagios.org>\n");
 724         printf (COPYRIGHT, copyright, email);
 725
 726         printf("%s\n", _("This plugin will attempt to open an SMTP connection with the host."));
 727
 728   printf ("\n\n");
 729
 730         print_usage ();
 731
 732         printf (_(UT_HELP_VRSN));
 733
 734         printf (_(UT_HOST_PORT), 'p', myport);
 735
 736         printf (_(UT_IPv46));
 737
 738         printf (" %s\n", "-e, --expect=STRING");
 739   printf (_("    String to expect in first line of server response (default: '%s')\n"), SMTP_EXPECT);
 740   printf (" %s\n", "-n, nocommand");
 741   printf ("    %s\n", _("Suppress SMTP command"));
 742   printf (" %s\n", "-C, --command=STRING");
 743   printf ("    %s\n", _("SMTP command (may be used repeatedly)"));
 744   printf (" %s\n", "-R, --command=STRING");
 745   printf ("    %s\n", _("Expected response to command (may be used repeatedly)"));
 746   printf (" %s\n", "-f, --from=STRING");
 747   printf ("    %s\n", _("FROM-address to include in MAIL command, required by Exchange 2000")),
 748 #ifdef HAVE_SSL
 749   printf (" %s\n", "-D, --certificate=INTEGER");
 750   printf ("    %s\n", _("Minimum number of days a certificate has to be valid."));
 751   printf (" %s\n", "-S, --starttls");
 752   printf ("    %s\n", _("Use STARTTLS for the connection."));
 753 #endif
 754
 755         printf (" %s\n", "-A, --authtype=STRING");
 756   printf ("    %s\n", _("SMTP AUTH type to check (default none, only LOGIN supported)"));
 757   printf (" %s\n", "-U, --authuser=STRING");
 758   printf ("    %s\n", _("SMTP AUTH username"));
 759   printf (" %s\n", "-P, --authpass=STRING");
 760   printf ("    %s\n", _("SMTP AUTH password"));
 761
 762         printf (_(UT_WARN_CRIT));
 763
 764         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 765
 766         printf (_(UT_VERBOSE));
 767
 768         printf("\n");
 769         printf ("%s\n", _("Successul connects return STATE_OK, refusals and timeouts return"));
 770   printf ("%s\n", _("STATE_CRITICAL, other errors return STATE_UNKNOWN.  Successful"));
 771   printf ("%s\n", _("connects, but incorrect reponse messages from the host result in"));
 772   printf ("%s\n", _("STATE_WARNING return values."));
 773
 774         printf (_(UT_SUPPORT));
 775 }
 776
 777
 778
 779 void
 780 print_usage (void)
 781 {
 782   printf (_("Usage:"));
 783         printf ("%s -H host [-p port] [-e expect] [-C command] [-f from addr]", progname);
 784   printf ("[-A authtype -U authuser -P authpass] [-w warn] [-c crit] [-t timeout]\n");
 785   printf ("[-S] [-D days] [-n] [-v] [-4|-6]\n");
 786 }
 787