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         struct hostent *hp;
 175
 176         setlocale (LC_ALL, "");
 177         bindtextdomain (PACKAGE, LOCALEDIR);
 178         textdomain (PACKAGE);
 179
 180         if (process_arguments (argc, argv) == ERROR)
 181                 usage4 (_("Could not parse arguments"));
 182
 183         /* initialize the HELO command with the localhostname */
 184         if(! localhostname){
 185                 localhostname = malloc (HOST_MAX_BYTES);
 186                 if(!localhostname){
 187                         printf(_("malloc() failed!\n"));
 188                         return STATE_CRITICAL;
 189                 }
 190                 if(gethostname(localhostname, HOST_MAX_BYTES)){
 191                         printf(_("gethostname() failed!\n"));
 192                         return STATE_CRITICAL;
 193                 }
 194                 hp = gethostbyname(localhostname);
 195                 if(!hp) helocmd = localhostname;
 196                 else helocmd = hp->h_name;
 197         } else {
 198                 helocmd = localhostname;
 199         }
 200         if(use_ehlo)
 201                 asprintf (&helocmd, "%s%s%s", SMTP_EHLO, helocmd, "\r\n");
 202         else
 203                 asprintf (&helocmd, "%s%s%s", SMTP_HELO, helocmd, "\r\n");
 204
 205         /* initialize the MAIL command with optional FROM command  */
 206         asprintf (&cmd_str, "%sFROM: %s%s", mail_command, from_arg, "\r\n");
 207
 208         if (verbose && smtp_use_dummycmd)
 209                 printf ("FROM CMD: %s", cmd_str);
 210
 211         /* initialize alarm signal handling */
 212         (void) signal (SIGALRM, socket_timeout_alarm_handler);
 213
 214         /* set socket timeout */
 215         (void) alarm (socket_timeout);
 216
 217         /* start timer */
 218         gettimeofday (&tv, NULL);
 219
 220         /* try to connect to the host at the given port number */
 221         result = my_tcp_connect (server_address, server_port, &sd);
 222
 223         if (result == STATE_OK) { /* we connected */
 224
 225                 /* watch for the SMTP connection string and */
 226                 /* return a WARNING status if we couldn't read any data */
 227                 if (recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0) == -1) {
 228                         printf (_("recv() failed\n"));
 229                         result = STATE_WARNING;
 230                 }
 231                 else {
 232                         if (verbose)
 233                                 printf ("%s", buffer);
 234                         /* strip the buffer of carriage returns */
 235                         strip (buffer);
 236                         /* make sure we find the response we are looking for */
 237                         if (!strstr (buffer, server_expect)) {
 238                                 if (server_port == SMTP_PORT)
 239                                         printf (_("Invalid SMTP response received from host\n"));
 240                                 else
 241                                         printf (_("Invalid SMTP response received from host on port %d\n"),
 242                                                                         server_port);
 243                                 result = STATE_WARNING;
 244                         }
 245                 }
 246
 247                 /* send the HELO/EHLO command */
 248                 send(sd, helocmd, strlen(helocmd), 0);
 249
 250                 /* allow for response to helo command to reach us */
 251                 if(read (sd, buffer, MAXBUF - 1) < 0){
 252                         printf (_("recv() failed\n"));
 253                         return STATE_WARNING;
 254                 } else if(use_ehlo){
 255                         buffer[MAXBUF-1]='\0';
 256                         if(strstr(buffer, "250 STARTTLS") != NULL ||
 257                            strstr(buffer, "250-STARTTLS") != NULL){
 258                                 supports_tls=TRUE;
 259                         }
 260                 }
 261
 262                 if(use_ssl && ! supports_tls){
 263                         printf(_("WARNING - TLS not supported by server\n"));
 264                         send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0);
 265                         return STATE_WARNING;
 266                 }
 267
 268 #ifdef HAVE_SSL
 269                 if(use_ssl) {
 270                   /* send the STARTTLS command */
 271                   send(sd, SMTP_STARTTLS, strlen(SMTP_STARTTLS), 0);
 272
 273                   recv(sd,buffer, MAX_INPUT_BUFFER-1, 0); /* wait for it */
 274                   if (!strstr (buffer, server_expect)) {
 275                     printf (_("Server does not support STARTTLS\n"));
 276                     send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0);
 277                     return STATE_UNKNOWN;
 278                   }
 279                   result = np_net_ssl_init(sd);
 280                   if(result != STATE_OK) {
 281                     printf (_("CRITICAL - Cannot create SSL context.\n"));
 282                     np_net_ssl_cleanup();
 283                     close(sd);
 284                     return STATE_CRITICAL;
 285                   } else {
 286                         ssl_established = 1;
 287                   }
 288
 289                 /*
 290                  * Resend the EHLO command.
 291                  *
 292                  * RFC 3207 (4.2) says: ``The client MUST discard any knowledge
 293                  * obtained from the server, such as the list of SMTP service
 294                  * extensions, which was not obtained from the TLS negotiation
 295                  * itself.  The client SHOULD send an EHLO command as the first
 296                  * command after a successful TLS negotiation.''  For this
 297                  * reason, some MTAs will not allow an AUTH LOGIN command before
 298                  * we resent EHLO via TLS.
 299                  */
 300                 if (my_send(helocmd, strlen(helocmd)) <= 0) {
 301                         printf(_("SMTP UNKNOWN - Cannot send EHLO command via TLS.\n"));
 302                         my_close();
 303                         return STATE_UNKNOWN;
 304                 }
 305                 if (verbose)
 306                         printf(_("sent %s"), helocmd);
 307                 if ((n = my_recv(buffer, MAX_INPUT_BUFFER - 1)) <= 0) {
 308                         printf(_("SMTP UNKNOWN - Cannot read EHLO response via TLS.\n"));
 309                         my_close();
 310                         return STATE_UNKNOWN;
 311                 }
 312                 if (verbose) {
 313                         buffer[n] = '\0';
 314                         printf("%s", buffer);
 315                 }
 316
 317 #  ifdef USE_OPENSSL
 318                   if ( check_cert ) {
 319                     result = np_net_ssl_check_cert(days_till_exp);
 320                     if(result != STATE_OK){
 321                       printf (_("CRITICAL - Cannot retrieve server certificate.\n"));
 322                     }
 323                     my_close();
 324                     return result;
 325                   }
 326 #  endif /* USE_OPENSSL */
 327                 }
 328 #endif
 329
 330                 /* sendmail will syslog a "NOQUEUE" error if session does not attempt
 331                  * to do something useful. This can be prevented by giving a command
 332                  * even if syntax is illegal (MAIL requires a FROM:<...> argument)
 333                  *
 334                  * According to rfc821 you can include a null reversepath in the from command
 335                  * - but a log message is generated on the smtp server.
 336                  *
 337                  * You can disable sending mail_command with '--nocommand'
 338                  * Use the -f option to provide a FROM address
 339                  */
 340                 if (smtp_use_dummycmd) {
 341                   my_send(cmd_str, strlen(cmd_str));
 342                   my_recv(buffer, MAX_INPUT_BUFFER-1);
 343                   if (verbose)
 344                     printf("%s", buffer);
 345                 }
 346
 347                 while (n < ncommands) {
 348                         asprintf (&cmd_str, "%s%s", commands[n], "\r\n");
 349                         my_send(cmd_str, strlen(cmd_str));
 350                         my_recv(buffer, MAX_INPUT_BUFFER-1);
 351                         if (verbose)
 352                                 printf("%s", buffer);
 353                         strip (buffer);
 354                         if (n < nresponses) {
 355                                 cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
 356                                 errcode = regcomp (&preg, responses[n], cflags);
 357                                 if (errcode != 0) {
 358                                         regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
 359                                         printf (_("Could Not Compile Regular Expression"));
 360                                         return ERROR;
 361                                 }
 362                                 excode = regexec (&preg, buffer, 10, pmatch, eflags);
 363                                 if (excode == 0) {
 364                                         result = STATE_OK;
 365                                 }
 366                                 else if (excode == REG_NOMATCH) {
 367                                         result = STATE_WARNING;
 368                                         printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]);
 369                                 }
 370                                 else {
 371                                         regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER);
 372                                         printf (_("Execute Error: %s\n"), errbuf);
 373                                         result = STATE_UNKNOWN;
 374                                 }
 375                         }
 376                         n++;
 377                 }
 378
 379                 if (authtype != NULL) {
 380                         if (strcmp (authtype, "LOGIN") == 0) {
 381                                 char *abuf;
 382                                 int ret;
 383                                 do {
 384                                         if (authuser == NULL) {
 385                                                 result = STATE_CRITICAL;
 386                                                 error_msg = _("no authuser specified, ");
 387                                                 break;
 388                                         }
 389                                         if (authpass == NULL) {
 390                                                 result = STATE_CRITICAL;
 391                                                 error_msg = _("no authpass specified, ");
 392                                                 break;
 393                                         }
 394
 395                                         /* send AUTH LOGIN */
 396                                         my_send(SMTP_AUTH_LOGIN, strlen(SMTP_AUTH_LOGIN));
 397                                         if (verbose)
 398                                                 printf (_("sent %s\n"), "AUTH LOGIN");
 399
 400                                         if((ret = my_recv(buffer, MAXBUF - 1)) < 0){
 401                                                 error_msg = _("recv() failed after AUTH LOGIN, \n");
 402                                                 result = STATE_WARNING;
 403                                                 break;
 404                                         }
 405                                         buffer[ret] = 0;
 406                                         if (verbose)
 407                                                 printf (_("received %s\n"), buffer);
 408
 409                                         if (strncmp (buffer, "334", 3) != 0) {
 410                                                 result = STATE_CRITICAL;
 411                                                 error_msg = _("invalid response received after AUTH LOGIN, ");
 412                                                 break;
 413                                         }
 414
 415                                         /* encode authuser with base64 */
 416                                         abuf = base64 (authuser, strlen(authuser));
 417                                         strcat (abuf, "\r\n");
 418                                         my_send(abuf, strlen(abuf));
 419                                         if (verbose)
 420                                                 printf (_("sent %s\n"), abuf);
 421
 422                                         if ((ret = my_recv(buffer, MAX_INPUT_BUFFER-1)) == -1) {
 423                                                 result = STATE_CRITICAL;
 424                                                 error_msg = _("recv() failed after sending authuser, ");
 425                                                 break;
 426                                         }
 427                                         buffer[ret] = 0;
 428                                         if (verbose) {
 429                                                 printf (_("received %s\n"), buffer);
 430                                         }
 431                                         if (strncmp (buffer, "334", 3) != 0) {
 432                                                 result = STATE_CRITICAL;
 433                                                 error_msg = _("invalid response received after authuser, ");
 434                                                 break;
 435                                         }
 436                                         /* encode authpass with base64 */
 437                                         abuf = base64 (authpass, strlen(authpass));
 438                                         strcat (abuf, "\r\n");
 439                                         my_send(abuf, strlen(abuf));
 440                                         if (verbose) {
 441                                                 printf (_("sent %s\n"), abuf);
 442                                         }
 443                                         if ((ret = my_recv(buffer, MAX_INPUT_BUFFER-1)) == -1) {
 444                                                 result = STATE_CRITICAL;
 445                                                 error_msg = _("recv() failed after sending authpass, ");
 446                                                 break;
 447                                         }
 448                                         buffer[ret] = 0;
 449                                         if (verbose) {
 450                                                 printf (_("received %s\n"), buffer);
 451                                         }
 452                                         if (strncmp (buffer, "235", 3) != 0) {
 453                                                 result = STATE_CRITICAL;
 454                                                 error_msg = _("invalid response received after authpass, ");
 455                                                 break;
 456                                         }
 457                                         break;
 458                                 } while (0);
 459                         } else {
 460                                 result = STATE_CRITICAL;
 461                                 error_msg = _("only authtype LOGIN is supported, ");
 462                         }
 463                 }
 464
 465                 /* tell the server we're done */
 466                 my_send (SMTP_QUIT, strlen (SMTP_QUIT));
 467
 468                 /* finally close the connection */
 469                 close (sd);
 470         }
 471
 472         /* reset the alarm */
 473         alarm (0);
 474
 475         microsec = deltime (tv);
 476         elapsed_time = (double)microsec / 1.0e6;
 477
 478         if (result == STATE_OK) {
 479                 if (check_critical_time && elapsed_time > (double) critical_time)
 480                         result = STATE_CRITICAL;
 481                 else if (check_warning_time && elapsed_time > (double) warning_time)
 482                         result = STATE_WARNING;
 483         }
 484
 485         printf (_("SMTP %s - %s%.3f sec. response time%s%s|%s\n"),
 486                         state_text (result),
 487                         (error_msg == NULL ? "" : error_msg),
 488                         elapsed_time,
 489                         verbose?", ":"", verbose?buffer:"",
 490                         fperfdata ("time", elapsed_time, "s",
 491                                 (int)check_warning_time, warning_time,
 492                                 (int)check_critical_time, critical_time,
 493                                 TRUE, 0, FALSE, 0));
 494
 495         return result;
 496 }
 497
 498
 499
 500 /* process command-line arguments */
 501 int
 502 process_arguments (int argc, char **argv)
 503 {
 504         int c;
 505
 506         int option = 0;
 507         static struct option longopts[] = {
 508                 {"hostname", required_argument, 0, 'H'},
 509                 {"expect", required_argument, 0, 'e'},
 510                 {"critical", required_argument, 0, 'c'},
 511                 {"warning", required_argument, 0, 'w'},
 512                 {"timeout", required_argument, 0, 't'},
 513                 {"port", required_argument, 0, 'p'},
 514                 {"from", required_argument, 0, 'f'},
 515                 {"fqdn", required_argument, 0, 'F'},
 516                 {"authtype", required_argument, 0, 'A'},
 517                 {"authuser", required_argument, 0, 'U'},
 518                 {"authpass", required_argument, 0, 'P'},
 519                 {"command", required_argument, 0, 'C'},
 520                 {"response", required_argument, 0, 'R'},
 521                 {"nocommand", required_argument, 0, 'n'},
 522                 {"verbose", no_argument, 0, 'v'},
 523                 {"version", no_argument, 0, 'V'},
 524                 {"use-ipv4", no_argument, 0, '4'},
 525                 {"use-ipv6", no_argument, 0, '6'},
 526                 {"help", no_argument, 0, 'h'},
 527                 {"starttls",no_argument,0,'S'},
 528                 {"certificate",required_argument,0,'D'},
 529                 {0, 0, 0, 0}
 530         };
 531
 532         if (argc < 2)
 533                 return ERROR;
 534
 535         for (c = 1; c < argc; c++) {
 536                 if (strcmp ("-to", argv[c]) == 0)
 537                         strcpy (argv[c], "-t");
 538                 else if (strcmp ("-wt", argv[c]) == 0)
 539                         strcpy (argv[c], "-w");
 540                 else if (strcmp ("-ct", argv[c]) == 0)
 541                         strcpy (argv[c], "-c");
 542         }
 543
 544         while (1) {
 545                 c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:R:SD:F:A:U:P:",
 546                                  longopts, &option);
 547
 548                 if (c == -1 || c == EOF)
 549                         break;
 550
 551                 switch (c) {
 552                 case 'H':                                                                       /* hostname */
 553                         if (is_host (optarg)) {
 554                                 server_address = optarg;
 555                         }
 556                         else {
 557                                 usage2 (_("Invalid hostname/address"), optarg);
 558                         }
 559                         break;
 560                 case 'p':                                                                       /* port */
 561                         if (is_intpos (optarg))
 562                                 server_port = atoi (optarg);
 563                         else
 564                                 usage4 (_("Port must be a positive integer"));
 565                         break;
 566                 case 'F':
 567                 /* localhostname */
 568                         localhostname = strdup(optarg);
 569                         break;
 570                 case 'f':                                                                       /* from argument */
 571                         from_arg = optarg;
 572                         smtp_use_dummycmd = 1;
 573                         break;
 574                 case 'A':
 575                         authtype = optarg;
 576                         break;
 577                 case 'U':
 578                         authuser = optarg;
 579                         break;
 580                 case 'P':
 581                         authpass = optarg;
 582                         break;
 583                 case 'e':                                                                       /* server expect string on 220  */
 584                         server_expect = optarg;
 585                         break;
 586                 case 'C':                                                                       /* commands  */
 587                         if (ncommands >= command_size) {
 588                                 commands = realloc (commands, command_size+8);
 589                                 if (commands == NULL)
 590                                         die (STATE_UNKNOWN,
 591                                              _("Could not realloc() units [%d]\n"), ncommands);
 592                         }
 593                         commands[ncommands] = optarg;
 594                         ncommands++;
 595                         break;
 596                 case 'R':                                                                       /* server responses */
 597                         if (nresponses >= response_size) {
 598                                 responses = realloc (responses, response_size+8);
 599                                 if (responses == NULL)
 600                                         die (STATE_UNKNOWN,
 601                                              _("Could not realloc() units [%d]\n"), nresponses);
 602                         }
 603                         responses[nresponses] = optarg;
 604                         nresponses++;
 605                         break;
 606                 case 'c':                                                                       /* critical time threshold */
 607                         if (is_intnonneg (optarg)) {
 608                                 critical_time = atoi (optarg);
 609                                 check_critical_time = TRUE;
 610                         }
 611                         else {
 612                                 usage4 (_("Critical time must be a positive integer"));
 613                         }
 614                         break;
 615                 case 'w':                                                                       /* warning time threshold */
 616                         if (is_intnonneg (optarg)) {
 617                                 warning_time = atoi (optarg);
 618                                 check_warning_time = TRUE;
 619                         }
 620                         else {
 621                                 usage4 (_("Warning time must be a positive integer"));
 622                         }
 623                         break;
 624                 case 'v':                                                                       /* verbose */
 625                         verbose++;
 626                         break;
 627                 case 't':                                                                       /* timeout */
 628                         if (is_intnonneg (optarg)) {
 629                                 socket_timeout = atoi (optarg);
 630                         }
 631                         else {
 632                                 usage4 (_("Timeout interval must be a positive integer"));
 633                         }
 634                         break;
 635                 case 'S':
 636                 /* starttls */
 637                         use_ssl = TRUE;
 638                         use_ehlo = TRUE;
 639                         break;
 640                 case 'D':
 641                 /* Check SSL cert validity */
 642 #ifdef USE_OPENSSL
 643                         if (!is_intnonneg (optarg))
 644                                 usage2 ("Invalid certificate expiration period",optarg);
 645                                 days_till_exp = atoi (optarg);
 646                                 check_cert = TRUE;
 647 #else
 648                                 usage (_("SSL support not available - install OpenSSL and recompile"));
 649 #endif
 650                         break;
 651                 case '4':
 652                         address_family = AF_INET;
 653                         break;
 654                 case '6':
 655 #ifdef USE_IPV6
 656                         address_family = AF_INET6;
 657 #else
 658                         usage4 (_("IPv6 support not available"));
 659 #endif
 660                         break;
 661                 case 'V':                                                                       /* version */
 662                         print_revision (progname, revision);
 663                         exit (STATE_OK);
 664                 case 'h':                                                                       /* help */
 665                         print_help ();
 666                         exit (STATE_OK);
 667                 case '?':                                                                       /* help */
 668                         usage2 (_("Unknown argument"), optarg);
 669                 }
 670         }
 671
 672         c = optind;
 673         if (server_address == NULL) {
 674                 if (argv[c]) {
 675                         if (is_host (argv[c]))
 676                                 server_address = argv[c];
 677                         else
 678                                 usage2 (_("Invalid hostname/address"), argv[c]);
 679                 }
 680                 else {
 681                         asprintf (&server_address, "127.0.0.1");
 682                 }
 683         }
 684
 685         if (server_expect == NULL)
 686                 server_expect = strdup (SMTP_EXPECT);
 687
 688         if (mail_command == NULL)
 689                 mail_command = strdup("MAIL ");
 690
 691         if (from_arg==NULL)
 692                 from_arg = strdup(" ");
 693
 694         return validate_arguments ();
 695 }
 696
 697
 698
 699 int
 700 validate_arguments (void)
 701 {
 702         return OK;
 703 }
 704
 705
 706 int
 707 my_close (void)
 708 {
 709 #ifdef HAVE_SSL
 710   np_net_ssl_cleanup();
 711 #endif
 712   return close(sd);
 713 }
 714
 715
 716 void
 717 print_help (void)
 718 {
 719         char *myport;
 720         asprintf (&myport, "%d", SMTP_PORT);
 721
 722         print_revision (progname, revision);
 723
 724         printf ("Copyright (c) 1999-2001 Ethan Galstad <nagios@nagios.org>\n");
 725         printf (COPYRIGHT, copyright, email);
 726
 727         printf("%s\n", _("This plugin will attempt to open an SMTP connection with the host."));
 728
 729   printf ("\n\n");
 730
 731         print_usage ();
 732
 733         printf (_(UT_HELP_VRSN));
 734
 735         printf (_(UT_HOST_PORT), 'p', myport);
 736
 737         printf (_(UT_IPv46));
 738
 739         printf (" %s\n", "-e, --expect=STRING");
 740   printf (_("    String to expect in first line of server response (default: '%s')\n"), SMTP_EXPECT);
 741   printf (" %s\n", "-n, nocommand");
 742   printf ("    %s\n", _("Suppress SMTP command"));
 743   printf (" %s\n", "-C, --command=STRING");
 744   printf ("    %s\n", _("SMTP command (may be used repeatedly)"));
 745   printf (" %s\n", "-R, --command=STRING");
 746   printf ("    %s\n", _("Expected response to command (may be used repeatedly)"));
 747   printf (" %s\n", "-f, --from=STRING");
 748   printf ("    %s\n", _("FROM-address to include in MAIL command, required by Exchange 2000")),
 749 #ifdef HAVE_SSL
 750   printf (" %s\n", "-D, --certificate=INTEGER");
 751   printf ("    %s\n", _("Minimum number of days a certificate has to be valid."));
 752   printf (" %s\n", "-S, --starttls");
 753   printf ("    %s\n", _("Use STARTTLS for the connection."));
 754 #endif
 755
 756         printf (" %s\n", "-A, --authtype=STRING");
 757   printf ("    %s\n", _("SMTP AUTH type to check (default none, only LOGIN supported)"));
 758   printf (" %s\n", "-U, --authuser=STRING");
 759   printf ("    %s\n", _("SMTP AUTH username"));
 760   printf (" %s\n", "-P, --authpass=STRING");
 761   printf ("    %s\n", _("SMTP AUTH password"));
 762
 763         printf (_(UT_WARN_CRIT));
 764
 765         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 766
 767         printf (_(UT_VERBOSE));
 768
 769         printf("\n");
 770         printf ("%s\n", _("Successul connects return STATE_OK, refusals and timeouts return"));
 771   printf ("%s\n", _("STATE_CRITICAL, other errors return STATE_UNKNOWN.  Successful"));
 772   printf ("%s\n", _("connects, but incorrect reponse messages from the host result in"));
 773   printf ("%s\n", _("STATE_WARNING return values."));
 774
 775         printf (_(UT_SUPPORT));
 776 }
 777
 778
 779
 780 void
 781 print_usage (void)
 782 {
 783   printf (_("Usage:"));
 784         printf ("%s -H host [-p port] [-e expect] [-C command] [-f from addr]", progname);
 785   printf ("[-A authtype -U authuser -P authpass] [-w warn] [-c crit] [-t timeout]\n");
 786   printf ("[-S] [-D days] [-n] [-v] [-4|-6]\n");
 787 }
 788