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 = "";
 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         /* If localhostname not set on command line, use gethostname to set */
 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         }
 194         if(use_ehlo)
 195                 asprintf (&helocmd, "%s%s%s", SMTP_EHLO, localhostname, "\r\n");
 196         else
 197                 asprintf (&helocmd, "%s%s%s", SMTP_HELO, localhostname, "\r\n");
 198
 199         if (verbose)
 200                 printf("HELOCMD: %s", helocmd);
 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
 286                 /*
 287                  * Resend the EHLO command.
 288                  *
 289                  * RFC 3207 (4.2) says: ``The client MUST discard any knowledge
 290                  * obtained from the server, such as the list of SMTP service
 291                  * extensions, which was not obtained from the TLS negotiation
 292                  * itself.  The client SHOULD send an EHLO command as the first
 293                  * command after a successful TLS negotiation.''  For this
 294                  * reason, some MTAs will not allow an AUTH LOGIN command before
 295                  * we resent EHLO via TLS.
 296                  */
 297                 if (my_send(helocmd, strlen(helocmd)) <= 0) {
 298                         printf("%s\n", _("SMTP UNKNOWN - Cannot send EHLO command via TLS."));
 299                         my_close();
 300                         return STATE_UNKNOWN;
 301                 }
 302                 if (verbose)
 303                         printf(_("sent %s"), helocmd);
 304                 if ((n = my_recv(buffer, MAX_INPUT_BUFFER - 1)) <= 0) {
 305                         printf("%s\n", _("SMTP UNKNOWN - Cannot read EHLO response via TLS."));
 306                         my_close();
 307                         return STATE_UNKNOWN;
 308                 }
 309                 if (verbose) {
 310                         buffer[n] = '\0';
 311                         printf("%s", buffer);
 312                 }
 313
 314 #  ifdef USE_OPENSSL
 315                   if ( check_cert ) {
 316                     result = np_net_ssl_check_cert(days_till_exp);
 317                     if(result != STATE_OK){
 318                       printf ("%s\n", _("CRITICAL - Cannot retrieve server certificate."));
 319                     }
 320                     my_close();
 321                     return result;
 322                   }
 323 #  endif /* USE_OPENSSL */
 324                 }
 325 #endif
 326
 327                 /* sendmail will syslog a "NOQUEUE" error if session does not attempt
 328                  * to do something useful. This can be prevented by giving a command
 329                  * even if syntax is illegal (MAIL requires a FROM:<...> argument)
 330                  *
 331                  * According to rfc821 you can include a null reversepath in the from command
 332                  * - but a log message is generated on the smtp server.
 333                  *
 334                  * You can disable sending mail_command with '--nocommand'
 335                  * Use the -f option to provide a FROM address
 336                  */
 337                 if (smtp_use_dummycmd) {
 338                   my_send(cmd_str, strlen(cmd_str));
 339                   my_recv(buffer, MAX_INPUT_BUFFER-1);
 340                   if (verbose)
 341                     printf("%s", buffer);
 342                 }
 343
 344                 while (n < ncommands) {
 345                         asprintf (&cmd_str, "%s%s", commands[n], "\r\n");
 346                         my_send(cmd_str, strlen(cmd_str));
 347                         my_recv(buffer, MAX_INPUT_BUFFER-1);
 348                         if (verbose)
 349                                 printf("%s", buffer);
 350                         strip (buffer);
 351                         if (n < nresponses) {
 352                                 cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
 353                                 errcode = regcomp (&preg, responses[n], cflags);
 354                                 if (errcode != 0) {
 355                                         regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
 356                                         printf (_("Could Not Compile Regular Expression"));
 357                                         return ERROR;
 358                                 }
 359                                 excode = regexec (&preg, buffer, 10, pmatch, eflags);
 360                                 if (excode == 0) {
 361                                         result = STATE_OK;
 362                                 }
 363                                 else if (excode == REG_NOMATCH) {
 364                                         result = STATE_WARNING;
 365                                         printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]);
 366                                 }
 367                                 else {
 368                                         regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER);
 369                                         printf (_("Execute Error: %s\n"), errbuf);
 370                                         result = STATE_UNKNOWN;
 371                                 }
 372                         }
 373                         n++;
 374                 }
 375
 376                 if (authtype != NULL) {
 377                         if (strcmp (authtype, "LOGIN") == 0) {
 378                                 char *abuf;
 379                                 int ret;
 380                                 do {
 381                                         if (authuser == NULL) {
 382                                                 result = STATE_CRITICAL;
 383                                                 asprintf(&error_msg, _("no authuser specified, "));
 384                                                 break;
 385                                         }
 386                                         if (authpass == NULL) {
 387                                                 result = STATE_CRITICAL;
 388                                                 asprintf(&error_msg, _("no authpass specified, "));
 389                                                 break;
 390                                         }
 391
 392                                         /* send AUTH LOGIN */
 393                                         my_send(SMTP_AUTH_LOGIN, strlen(SMTP_AUTH_LOGIN));
 394                                         if (verbose)
 395                                                 printf (_("sent %s\n"), "AUTH LOGIN");
 396
 397                                         if((ret = my_recv(buffer, MAXBUF - 1)) < 0){
 398                                                 asprintf(&error_msg, _("recv() failed after AUTH LOGIN, "));
 399                                                 result = STATE_WARNING;
 400                                                 break;
 401                                         }
 402                                         buffer[ret] = 0;
 403                                         if (verbose)
 404                                                 printf (_("received %s\n"), buffer);
 405
 406                                         if (strncmp (buffer, "334", 3) != 0) {
 407                                                 result = STATE_CRITICAL;
 408                                                 asprintf(&error_msg, _("invalid response received after AUTH LOGIN, "));
 409                                                 break;
 410                                         }
 411
 412                                         /* encode authuser with base64 */
 413                                         abuf = base64 (authuser, strlen(authuser));
 414                                         strcat (abuf, "\r\n");
 415                                         my_send(abuf, strlen(abuf));
 416                                         if (verbose)
 417                                                 printf (_("sent %s\n"), abuf);
 418
 419                                         if ((ret = my_recv(buffer, MAX_INPUT_BUFFER-1)) == -1) {
 420                                                 result = STATE_CRITICAL;
 421                                                 asprintf(&error_msg, _("recv() failed after sending authuser, "));
 422                                                 break;
 423                                         }
 424                                         buffer[ret] = 0;
 425                                         if (verbose) {
 426                                                 printf (_("received %s\n"), buffer);
 427                                         }
 428                                         if (strncmp (buffer, "334", 3) != 0) {
 429                                                 result = STATE_CRITICAL;
 430                                                 asprintf(&error_msg, _("invalid response received after authuser, "));
 431                                                 break;
 432                                         }
 433                                         /* encode authpass with base64 */
 434                                         abuf = base64 (authpass, strlen(authpass));
 435                                         strcat (abuf, "\r\n");
 436                                         my_send(abuf, strlen(abuf));
 437                                         if (verbose) {
 438                                                 printf (_("sent %s\n"), abuf);
 439                                         }
 440                                         if ((ret = my_recv(buffer, MAX_INPUT_BUFFER-1)) == -1) {
 441                                                 result = STATE_CRITICAL;
 442                                                 asprintf(&error_msg, _("recv() failed after sending authpass, "));
 443                                                 break;
 444                                         }
 445                                         buffer[ret] = 0;
 446                                         if (verbose) {
 447                                                 printf (_("received %s\n"), buffer);
 448                                         }
 449                                         if (strncmp (buffer, "235", 3) != 0) {
 450                                                 result = STATE_CRITICAL;
 451                                                 asprintf(&error_msg, _("invalid response received after authpass, "));
 452                                                 break;
 453                                         }
 454                                         break;
 455                                 } while (0);
 456                         } else {
 457                                 result = STATE_CRITICAL;
 458                                 asprintf(&error_msg, _("only authtype LOGIN is supported, "));
 459                         }
 460                 }
 461
 462                 /* tell the server we're done */
 463                 my_send (SMTP_QUIT, strlen (SMTP_QUIT));
 464
 465                 /* finally close the connection */
 466                 close (sd);
 467         }
 468
 469         /* reset the alarm */
 470         alarm (0);
 471
 472         microsec = deltime (tv);
 473         elapsed_time = (double)microsec / 1.0e6;
 474
 475         if (result == STATE_OK) {
 476                 if (check_critical_time && elapsed_time > (double) critical_time)
 477                         result = STATE_CRITICAL;
 478                 else if (check_warning_time && elapsed_time > (double) warning_time)
 479                         result = STATE_WARNING;
 480         }
 481
 482         printf (_("SMTP %s - %s%.3f sec. response time%s%s|%s\n"),
 483                         state_text (result),
 484                         error_msg,
 485                         elapsed_time,
 486                         verbose?", ":"", verbose?buffer:"",
 487                         fperfdata ("time", elapsed_time, "s",
 488                                 (int)check_warning_time, warning_time,
 489                                 (int)check_critical_time, critical_time,
 490                                 TRUE, 0, FALSE, 0));
 491
 492         return result;
 493 }
 494
 495
 496
 497 /* process command-line arguments */
 498 int
 499 process_arguments (int argc, char **argv)
 500 {
 501         int c;
 502
 503         int option = 0;
 504         static struct option longopts[] = {
 505                 {"hostname", required_argument, 0, 'H'},
 506                 {"expect", required_argument, 0, 'e'},
 507                 {"critical", required_argument, 0, 'c'},
 508                 {"warning", required_argument, 0, 'w'},
 509                 {"timeout", required_argument, 0, 't'},
 510                 {"port", required_argument, 0, 'p'},
 511                 {"from", required_argument, 0, 'f'},
 512                 {"fqdn", required_argument, 0, 'F'},
 513                 {"authtype", required_argument, 0, 'A'},
 514                 {"authuser", required_argument, 0, 'U'},
 515                 {"authpass", required_argument, 0, 'P'},
 516                 {"command", required_argument, 0, 'C'},
 517                 {"response", required_argument, 0, 'R'},
 518                 {"nocommand", required_argument, 0, 'n'},
 519                 {"verbose", no_argument, 0, 'v'},
 520                 {"version", no_argument, 0, 'V'},
 521                 {"use-ipv4", no_argument, 0, '4'},
 522                 {"use-ipv6", no_argument, 0, '6'},
 523                 {"help", no_argument, 0, 'h'},
 524                 {"starttls",no_argument,0,'S'},
 525                 {"certificate",required_argument,0,'D'},
 526                 {0, 0, 0, 0}
 527         };
 528
 529         if (argc < 2)
 530                 return ERROR;
 531
 532         for (c = 1; c < argc; c++) {
 533                 if (strcmp ("-to", argv[c]) == 0)
 534                         strcpy (argv[c], "-t");
 535                 else if (strcmp ("-wt", argv[c]) == 0)
 536                         strcpy (argv[c], "-w");
 537                 else if (strcmp ("-ct", argv[c]) == 0)
 538                         strcpy (argv[c], "-c");
 539         }
 540
 541         while (1) {
 542                 c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:R:SD:F:A:U:P:",
 543                                  longopts, &option);
 544
 545                 if (c == -1 || c == EOF)
 546                         break;
 547
 548                 switch (c) {
 549                 case 'H':                                                                       /* hostname */
 550                         if (is_host (optarg)) {
 551                                 server_address = optarg;
 552                         }
 553                         else {
 554                                 usage2 (_("Invalid hostname/address"), optarg);
 555                         }
 556                         break;
 557                 case 'p':                                                                       /* port */
 558                         if (is_intpos (optarg))
 559                                 server_port = atoi (optarg);
 560                         else
 561                                 usage4 (_("Port must be a positive integer"));
 562                         break;
 563                 case 'F':
 564                 /* localhostname */
 565                         localhostname = strdup(optarg);
 566                         break;
 567                 case 'f':                                                                       /* from argument */
 568                         from_arg = optarg;
 569                         smtp_use_dummycmd = 1;
 570                         break;
 571                 case 'A':
 572                         authtype = optarg;
 573                         break;
 574                 case 'U':
 575                         authuser = optarg;
 576                         break;
 577                 case 'P':
 578                         authpass = optarg;
 579                         break;
 580                 case 'e':                                                                       /* server expect string on 220  */
 581                         server_expect = optarg;
 582                         break;
 583                 case 'C':                                                                       /* commands  */
 584                         if (ncommands >= command_size) {
 585                                 commands = realloc (commands, command_size+8);
 586                                 if (commands == NULL)
 587                                         die (STATE_UNKNOWN,
 588                                              _("Could not realloc() units [%d]\n"), ncommands);
 589                         }
 590                         commands[ncommands] = optarg;
 591                         ncommands++;
 592                         break;
 593                 case 'R':                                                                       /* server responses */
 594                         if (nresponses >= response_size) {
 595                                 responses = realloc (responses, response_size+8);
 596                                 if (responses == NULL)
 597                                         die (STATE_UNKNOWN,
 598                                              _("Could not realloc() units [%d]\n"), nresponses);
 599                         }
 600                         responses[nresponses] = optarg;
 601                         nresponses++;
 602                         break;
 603                 case 'c':                                                                       /* critical time threshold */
 604                         if (is_intnonneg (optarg)) {
 605                                 critical_time = atoi (optarg);
 606                                 check_critical_time = TRUE;
 607                         }
 608                         else {
 609                                 usage4 (_("Critical time must be a positive integer"));
 610                         }
 611                         break;
 612                 case 'w':                                                                       /* warning time threshold */
 613                         if (is_intnonneg (optarg)) {
 614                                 warning_time = atoi (optarg);
 615                                 check_warning_time = TRUE;
 616                         }
 617                         else {
 618                                 usage4 (_("Warning time must be a positive integer"));
 619                         }
 620                         break;
 621                 case 'v':                                                                       /* verbose */
 622                         verbose++;
 623                         break;
 624                 case 't':                                                                       /* timeout */
 625                         if (is_intnonneg (optarg)) {
 626                                 socket_timeout = atoi (optarg);
 627                         }
 628                         else {
 629                                 usage4 (_("Timeout interval must be a positive integer"));
 630                         }
 631                         break;
 632                 case 'S':
 633                 /* starttls */
 634                         use_ssl = TRUE;
 635                         use_ehlo = TRUE;
 636                         break;
 637                 case 'D':
 638                 /* Check SSL cert validity */
 639 #ifdef USE_OPENSSL
 640                         if (!is_intnonneg (optarg))
 641                                 usage2 ("Invalid certificate expiration period",optarg);
 642                                 days_till_exp = atoi (optarg);
 643                                 check_cert = TRUE;
 644 #else
 645                                 usage (_("SSL support not available - install OpenSSL and recompile"));
 646 #endif
 647                         break;
 648                 case '4':
 649                         address_family = AF_INET;
 650                         break;
 651                 case '6':
 652 #ifdef USE_IPV6
 653                         address_family = AF_INET6;
 654 #else
 655                         usage4 (_("IPv6 support not available"));
 656 #endif
 657                         break;
 658                 case 'V':                                                                       /* version */
 659                         print_revision (progname, revision);
 660                         exit (STATE_OK);
 661                 case 'h':                                                                       /* help */
 662                         print_help ();
 663                         exit (STATE_OK);
 664                 case '?':                                                                       /* help */
 665                         usage5 ();
 666                 }
 667         }
 668
 669         c = optind;
 670         if (server_address == NULL) {
 671                 if (argv[c]) {
 672                         if (is_host (argv[c]))
 673                                 server_address = argv[c];
 674                         else
 675                                 usage2 (_("Invalid hostname/address"), argv[c]);
 676                 }
 677                 else {
 678                         asprintf (&server_address, "127.0.0.1");
 679                 }
 680         }
 681
 682         if (server_expect == NULL)
 683                 server_expect = strdup (SMTP_EXPECT);
 684
 685         if (mail_command == NULL)
 686                 mail_command = strdup("MAIL ");
 687
 688         if (from_arg==NULL)
 689                 from_arg = strdup(" ");
 690
 691         return validate_arguments ();
 692 }
 693
 694
 695
 696 int
 697 validate_arguments (void)
 698 {
 699         return OK;
 700 }
 701
 702
 703 int
 704 my_close (void)
 705 {
 706 #ifdef HAVE_SSL
 707   np_net_ssl_cleanup();
 708 #endif
 709   return close(sd);
 710 }
 711
 712
 713 void
 714 print_help (void)
 715 {
 716         char *myport;
 717         asprintf (&myport, "%d", SMTP_PORT);
 718
 719         print_revision (progname, revision);
 720
 721         printf ("Copyright (c) 1999-2001 Ethan Galstad <nagios@nagios.org>\n");
 722         printf (COPYRIGHT, copyright, email);
 723
 724         printf("%s\n", _("This plugin will attempt to open an SMTP connection with the host."));
 725
 726   printf ("\n\n");
 727
 728         print_usage ();
 729
 730         printf (_(UT_HELP_VRSN));
 731
 732         printf (_(UT_HOST_PORT), 'p', myport);
 733
 734         printf (_(UT_IPv46));
 735
 736         printf (" %s\n", "-e, --expect=STRING");
 737   printf (_("    String to expect in first line of server response (default: '%s')\n"), SMTP_EXPECT);
 738   printf (" %s\n", "-n, nocommand");
 739   printf ("    %s\n", _("Suppress SMTP command"));
 740   printf (" %s\n", "-C, --command=STRING");
 741   printf ("    %s\n", _("SMTP command (may be used repeatedly)"));
 742   printf (" %s\n", "-R, --command=STRING");
 743   printf ("    %s\n", _("Expected response to command (may be used repeatedly)"));
 744   printf (" %s\n", "-f, --from=STRING");
 745   printf ("    %s\n", _("FROM-address to include in MAIL command, required by Exchange 2000")),
 746 #ifdef HAVE_SSL
 747   printf (" %s\n", "-D, --certificate=INTEGER");
 748   printf ("    %s\n", _("Minimum number of days a certificate has to be valid."));
 749   printf (" %s\n", "-S, --starttls");
 750   printf ("    %s\n", _("Use STARTTLS for the connection."));
 751 #endif
 752
 753         printf (" %s\n", "-A, --authtype=STRING");
 754   printf ("    %s\n", _("SMTP AUTH type to check (default none, only LOGIN supported)"));
 755   printf (" %s\n", "-U, --authuser=STRING");
 756   printf ("    %s\n", _("SMTP AUTH username"));
 757   printf (" %s\n", "-P, --authpass=STRING");
 758   printf ("    %s\n", _("SMTP AUTH password"));
 759
 760         printf (_(UT_WARN_CRIT));
 761
 762         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 763
 764         printf (_(UT_VERBOSE));
 765
 766         printf("\n");
 767         printf ("%s\n", _("Successul connects return STATE_OK, refusals and timeouts return"));
 768   printf ("%s\n", _("STATE_CRITICAL, other errors return STATE_UNKNOWN.  Successful"));
 769   printf ("%s\n", _("connects, but incorrect reponse messages from the host result in"));
 770   printf ("%s\n", _("STATE_WARNING return values."));
 771
 772         printf (_(UT_SUPPORT));
 773 }
 774
 775
 776
 777 void
 778 print_usage (void)
 779 {
 780   printf (_("Usage:"));
 781         printf ("%s -H host [-p port] [-e expect] [-C command] [-f from addr]", progname);
 782   printf ("[-A authtype -U authuser -P authpass] [-w warn] [-c crit] [-t timeout]\n");
 783   printf ("[-S] [-D days] [-n] [-v] [-4|-6]\n");
 784 }
 785