plugins/check_smtp.c

   1 /******************************************************************************
   2
   3  This program is free software; you can redistribute it and/or modify
   4  it under the terms of the GNU General Public License as published by
   5  the Free Software Foundation; either version 2 of the License, or
   6  (at your option) any later version.
   7
   8  This program is distributed in the hope that it will be useful,
   9  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  GNU General Public License for more details.
  12
  13  You should have received a copy of the GNU General Public License
  14  along with this program; if not, write to the Free Software
  15  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  16
  17  $Id$
  18
  19 ******************************************************************************/
  20
  21 const char *progname = "check_smtp";
  22 const char *revision = "$Revision$";
  23 const char *copyright = "2000-2004";
  24 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  25
  26 #include "common.h"
  27 #include "netutils.h"
  28 #include "utils.h"
  29
  30 #ifdef HAVE_SSL
  31 int check_cert = FALSE;
  32 int days_till_exp;
  33 #  define my_recv(buf, len) ((use_ssl && ssl_established) ? np_net_ssl_read(buf, len) : read(sd, buf, len))
  34 #  define my_send(buf, len) ((use_ssl && ssl_established) ? np_net_ssl_write(buf, len) : send(sd, buf, len, 0))
  35 #else /* ifndef HAVE_SSL */
  36 #  define my_recv(buf, len) read(sd, buf, len)
  37 #  define my_send(buf, len) send(sd, buf, len, 0)
  38 #endif
  39
  40 enum {
  41         SMTP_PORT       = 25
  42 };
  43 #define SMTP_EXPECT "220"
  44 #define SMTP_HELO "HELO "
  45 #define SMTP_EHLO "EHLO "
  46 #define SMTP_QUIT "QUIT\r\n"
  47 #define SMTP_STARTTLS "STARTTLS\r\n"
  48 #define SMTP_AUTH_LOGIN "AUTH LOGIN\r\n"
  49
  50 #ifndef HOST_MAX_BYTES
  51 #define HOST_MAX_BYTES 255
  52 #endif
  53
  54 #define EHLO_SUPPORTS_STARTTLS 1
  55
  56 int process_arguments (int, char **);
  57 int validate_arguments (void);
  58 void print_help (void);
  59 void print_usage (void);
  60 int my_close(void);
  61
  62 #include "regex.h"
  63 char regex_expect[MAX_INPUT_BUFFER] = "";
  64 regex_t preg;
  65 regmatch_t pmatch[10];
  66 char timestamp[20] = "";
  67 char errbuf[MAX_INPUT_BUFFER];
  68 int cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
  69 int eflags = 0;
  70 int errcode, excode;
  71
  72 int server_port = SMTP_PORT;
  73 char *server_address = NULL;
  74 char *server_expect = NULL;
  75 int smtp_use_dummycmd = 0;
  76 char *mail_command = NULL;
  77 char *from_arg = NULL;
  78 int ncommands=0;
  79 int command_size=0;
  80 int nresponses=0;
  81 int response_size=0;
  82 char **commands = NULL;
  83 char **responses = NULL;
  84 char *authtype = NULL;
  85 char *authuser = NULL;
  86 char *authpass = NULL;
  87 int warning_time = 0;
  88 int check_warning_time = FALSE;
  89 int critical_time = 0;
  90 int check_critical_time = FALSE;
  91 int verbose = 0;
  92 int use_ssl = FALSE;
  93 short use_ehlo = FALSE;
  94 short ssl_established = 0;
  95 char *localhostname = NULL;
  96 int sd;
  97 char buffer[MAX_INPUT_BUFFER];
  98 enum {
  99   TCP_PROTOCOL = 1,
 100   UDP_PROTOCOL = 2,
 101   MAXBUF = 1024
 102 };
 103
 104 /* written by lauri alanko */
 105 static char *
 106 base64 (const char *bin, size_t len)
 107 {
 108
 109         char *buf = (char *) malloc ((len + 2) / 3 * 4 + 1);
 110         size_t i = 0, j = 0;
 111
 112         char BASE64_END = '=';
 113         char base64_table[64];
 114         strncpy (base64_table, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/", 64);
 115
 116         while (j < len - 2) {
 117                 buf[i++] = base64_table[bin[j] >> 2];
 118                 buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
 119                 buf[i++] = base64_table[((bin[j + 1] & 15) << 2) | (bin[j + 2] >> 6)];
 120                 buf[i++] = base64_table[bin[j + 2] & 63];
 121                 j += 3;
 122         }
 123
 124         switch (len - j) {
 125         case 1:
 126                 buf[i++] = base64_table[bin[j] >> 2];
 127                 buf[i++] = base64_table[(bin[j] & 3) << 4];
 128                 buf[i++] = BASE64_END;
 129                 buf[i++] = BASE64_END;
 130                 break;
 131         case 2:
 132                 buf[i++] = base64_table[bin[j] >> 2];
 133                 buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
 134                 buf[i++] = base64_table[(bin[j + 1] & 15) << 2];
 135                 buf[i++] = BASE64_END;
 136                 break;
 137         case 0:
 138                 break;
 139         }
 140
 141         buf[i] = '\0';
 142         return buf;
 143 }
 144
 145 int
 146 main (int argc, char **argv)
 147 {
 148         short supports_tls=FALSE;
 149         int n = 0;
 150         double elapsed_time;
 151         long microsec;
 152         int result = STATE_UNKNOWN;
 153         char *cmd_str = NULL;
 154         char *helocmd = NULL;
 155         char *error_msg = NULL;
 156         struct timeval tv;
 157         struct hostent *hp;
 158
 159         setlocale (LC_ALL, "");
 160         bindtextdomain (PACKAGE, LOCALEDIR);
 161         textdomain (PACKAGE);
 162
 163         if (process_arguments (argc, argv) == ERROR)
 164                 usage4 (_("Could not parse arguments"));
 165
 166         /* initialize the HELO command with the localhostname */
 167         if(! localhostname){
 168                 localhostname = malloc (HOST_MAX_BYTES);
 169                 if(!localhostname){
 170                         printf(_("malloc() failed!\n"));
 171                         return STATE_CRITICAL;
 172                 }
 173                 if(gethostname(localhostname, HOST_MAX_BYTES)){
 174                         printf(_("gethostname() failed!\n"));
 175                         return STATE_CRITICAL;
 176                 }
 177                 hp = gethostbyname(localhostname);
 178                 if(!hp) helocmd = localhostname;
 179                 else helocmd = hp->h_name;
 180         } else {
 181                 helocmd = localhostname;
 182         }
 183         if(use_ehlo)
 184                 asprintf (&helocmd, "%s%s%s", SMTP_EHLO, helocmd, "\r\n");
 185         else
 186                 asprintf (&helocmd, "%s%s%s", SMTP_HELO, helocmd, "\r\n");
 187
 188         /* initialize the MAIL command with optional FROM command  */
 189         asprintf (&cmd_str, "%sFROM: %s%s", mail_command, from_arg, "\r\n");
 190
 191         if (verbose && smtp_use_dummycmd)
 192                 printf ("FROM CMD: %s", cmd_str);
 193
 194         /* initialize alarm signal handling */
 195         (void) signal (SIGALRM, socket_timeout_alarm_handler);
 196
 197         /* set socket timeout */
 198         (void) alarm (socket_timeout);
 199
 200         /* start timer */
 201         gettimeofday (&tv, NULL);
 202
 203         /* try to connect to the host at the given port number */
 204         result = my_tcp_connect (server_address, server_port, &sd);
 205
 206         if (result == STATE_OK) { /* we connected */
 207
 208                 /* watch for the SMTP connection string and */
 209                 /* return a WARNING status if we couldn't read any data */
 210                 if (recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0) == -1) {
 211                         printf (_("recv() failed\n"));
 212                         result = STATE_WARNING;
 213                 }
 214                 else {
 215                         if (verbose)
 216                                 printf ("%s", buffer);
 217                         /* strip the buffer of carriage returns */
 218                         strip (buffer);
 219                         /* make sure we find the response we are looking for */
 220                         if (!strstr (buffer, server_expect)) {
 221                                 if (server_port == SMTP_PORT)
 222                                         printf (_("Invalid SMTP response received from host\n"));
 223                                 else
 224                                         printf (_("Invalid SMTP response received from host on port %d\n"),
 225                                                                         server_port);
 226                                 result = STATE_WARNING;
 227                         }
 228                 }
 229
 230                 /* send the HELO/EHLO command */
 231                 send(sd, helocmd, strlen(helocmd), 0);
 232
 233                 /* allow for response to helo command to reach us */
 234                 if(read (sd, buffer, MAXBUF - 1) < 0){
 235                         printf (_("recv() failed\n"));
 236                         return STATE_WARNING;
 237                 } else if(use_ehlo){
 238                         buffer[MAXBUF-1]='\0';
 239                         if(strstr(buffer, "250 STARTTLS") != NULL ||
 240                            strstr(buffer, "250-STARTTLS") != NULL){
 241                                 supports_tls=TRUE;
 242                         }
 243                 }
 244
 245                 if(use_ssl && ! supports_tls){
 246                         printf(_("WARNING - TLS not supported by server\n"));
 247                         send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0);
 248                         return STATE_WARNING;
 249                 }
 250
 251 #ifdef HAVE_SSL
 252                 if(use_ssl) {
 253                   /* send the STARTTLS command */
 254                   send(sd, SMTP_STARTTLS, strlen(SMTP_STARTTLS), 0);
 255
 256                   recv(sd,buffer, MAX_INPUT_BUFFER-1, 0); /* wait for it */
 257                   if (!strstr (buffer, server_expect)) {
 258                     printf (_("Server does not support STARTTLS\n"));
 259                     send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0);
 260                     return STATE_UNKNOWN;
 261                   }
 262                   result = np_net_ssl_init(sd);
 263                   if(result != STATE_OK) {
 264                     printf (_("CRITICAL - Cannot create SSL context.\n"));
 265                     np_net_ssl_cleanup();
 266                     close(sd);
 267                     return STATE_CRITICAL;
 268                   } else {
 269                         ssl_established = 1;
 270                   }
 271 #  ifdef USE_OPENSSL
 272                   if ( check_cert ) {
 273                     result = np_net_ssl_check_cert(days_till_exp);
 274                     if(result != STATE_OK){
 275                       printf (_("CRITICAL - Cannot retrieve server certificate.\n"));
 276                     }
 277                     my_close();
 278                     return result;
 279                   }
 280 #  endif /* USE_OPENSSL */
 281                 }
 282 #endif
 283
 284                 /* sendmail will syslog a "NOQUEUE" error if session does not attempt
 285                  * to do something useful. This can be prevented by giving a command
 286                  * even if syntax is illegal (MAIL requires a FROM:<...> argument)
 287                  *
 288                  * According to rfc821 you can include a null reversepath in the from command
 289                  * - but a log message is generated on the smtp server.
 290                  *
 291                  * You can disable sending mail_command with '--nocommand'
 292                  * Use the -f option to provide a FROM address
 293                  */
 294                 if (smtp_use_dummycmd) {
 295                   my_send(cmd_str, strlen(cmd_str));
 296                   my_recv(buffer, MAX_INPUT_BUFFER-1);
 297                   if (verbose)
 298                     printf("%s", buffer);
 299                 }
 300
 301                 while (n < ncommands) {
 302                         asprintf (&cmd_str, "%s%s", commands[n], "\r\n");
 303                         my_send(cmd_str, strlen(cmd_str));
 304                         my_recv(buffer, MAX_INPUT_BUFFER-1);
 305                         if (verbose)
 306                                 printf("%s", buffer);
 307                         strip (buffer);
 308                         if (n < nresponses) {
 309                                 cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
 310                                 errcode = regcomp (&preg, responses[n], cflags);
 311                                 if (errcode != 0) {
 312                                         regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
 313                                         printf (_("Could Not Compile Regular Expression"));
 314                                         return ERROR;
 315                                 }
 316                                 excode = regexec (&preg, buffer, 10, pmatch, eflags);
 317                                 if (excode == 0) {
 318                                         result = STATE_OK;
 319                                 }
 320                                 else if (excode == REG_NOMATCH) {
 321                                         result = STATE_WARNING;
 322                                         printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]);
 323                                 }
 324                                 else {
 325                                         regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER);
 326                                         printf (_("Execute Error: %s\n"), errbuf);
 327                                         result = STATE_UNKNOWN;
 328                                 }
 329                         }
 330                         n++;
 331                 }
 332
 333                 if (authtype != NULL) {
 334                         if (strcmp (authtype, "LOGIN") == 0) {
 335                                 char *abuf;
 336                                 int ret;
 337                                 do {
 338                                         if (authuser == NULL) {
 339                                                 result = STATE_CRITICAL;
 340                                                 error_msg = _("no authuser specified, ");
 341                                                 break;
 342                                         }
 343                                         if (authpass == NULL) {
 344                                                 result = STATE_CRITICAL;
 345                                                 error_msg = _("no authpass specified, ");
 346                                                 break;
 347                                         }
 348
 349                                         /* send AUTH LOGIN */
 350                                         my_send(SMTP_AUTH_LOGIN, strlen(SMTP_AUTH_LOGIN));
 351                                         if (verbose)
 352                                                 printf (_("sent %s\n"), "AUTH LOGIN");
 353
 354                                         if((ret = my_recv(buffer, MAXBUF - 1)) < 0){
 355                                                 error_msg = _("recv() failed after AUTH LOGIN, \n");
 356                                                 result = STATE_WARNING;
 357                                                 break;
 358                                         }
 359                                         buffer[ret] = 0;
 360                                         if (verbose)
 361                                                 printf (_("received %s\n"), buffer);
 362
 363                                         if (strncmp (buffer, "334", 3) != 0) {
 364                                                 result = STATE_CRITICAL;
 365                                                 error_msg = _("invalid response received after AUTH LOGIN, ");
 366                                                 break;
 367                                         }
 368
 369                                         /* encode authuser with base64 */
 370                                         abuf = base64 (authuser, strlen(authuser));
 371                                         strcat (abuf, "\r\n");
 372                                         my_send(abuf, strlen(abuf));
 373                                         if (verbose)
 374                                                 printf (_("sent %s\n"), abuf);
 375
 376                                         if ((ret = my_recv(buffer, MAX_INPUT_BUFFER-1)) == -1) {
 377                                                 result = STATE_CRITICAL;
 378                                                 error_msg = _("recv() failed after sending authuser, ");
 379                                                 break;
 380                                         }
 381                                         buffer[ret] = 0;
 382                                         if (verbose) {
 383                                                 printf (_("received %s\n"), buffer);
 384                                         }
 385                                         if (strncmp (buffer, "334", 3) != 0) {
 386                                                 result = STATE_CRITICAL;
 387                                                 error_msg = _("invalid response received after authuser, ");
 388                                                 break;
 389                                         }
 390                                         /* encode authpass with base64 */
 391                                         abuf = base64 (authpass, strlen(authpass));
 392                                         strcat (abuf, "\r\n");
 393                                         my_send(abuf, strlen(abuf));
 394                                         if (verbose) {
 395                                                 printf (_("sent %s\n"), abuf);
 396                                         }
 397                                         if ((ret = my_recv(buffer, MAX_INPUT_BUFFER-1)) == -1) {
 398                                                 result = STATE_CRITICAL;
 399                                                 error_msg = _("recv() failed after sending authpass, ");
 400                                                 break;
 401                                         }
 402                                         buffer[ret] = 0;
 403                                         if (verbose) {
 404                                                 printf (_("received %s\n"), buffer);
 405                                         }
 406                                         if (strncmp (buffer, "235", 3) != 0) {
 407                                                 result = STATE_CRITICAL;
 408                                                 error_msg = _("invalid response received after authpass, ");
 409                                                 break;
 410                                         }
 411                                         break;
 412                                 } while (0);
 413                         } else {
 414                                 result = STATE_CRITICAL;
 415                                 error_msg = _("only authtype LOGIN is supported, ");
 416                         }
 417                 }
 418
 419                 /* tell the server we're done */
 420                 my_send (SMTP_QUIT, strlen (SMTP_QUIT));
 421
 422                 /* finally close the connection */
 423                 close (sd);
 424         }
 425
 426         /* reset the alarm */
 427         alarm (0);
 428
 429         microsec = deltime (tv);
 430         elapsed_time = (double)microsec / 1.0e6;
 431
 432         if (result == STATE_OK) {
 433                 if (check_critical_time && elapsed_time > (double) critical_time)
 434                         result = STATE_CRITICAL;
 435                 else if (check_warning_time && elapsed_time > (double) warning_time)
 436                         result = STATE_WARNING;
 437         }
 438
 439         printf (_("SMTP %s - %s%.3f sec. response time%s%s|%s\n"),
 440                         state_text (result),
 441                         (error_msg == NULL ? "" : error_msg),
 442                         elapsed_time,
 443                         verbose?", ":"", verbose?buffer:"",
 444                         fperfdata ("time", elapsed_time, "s",
 445                                 (int)check_warning_time, warning_time,
 446                                 (int)check_critical_time, critical_time,
 447                                 TRUE, 0, FALSE, 0));
 448
 449         return result;
 450 }
 451
 452
 453
 454 /* process command-line arguments */
 455 int
 456 process_arguments (int argc, char **argv)
 457 {
 458         int c;
 459
 460         int option = 0;
 461         static struct option longopts[] = {
 462                 {"hostname", required_argument, 0, 'H'},
 463                 {"expect", required_argument, 0, 'e'},
 464                 {"critical", required_argument, 0, 'c'},
 465                 {"warning", required_argument, 0, 'w'},
 466                 {"timeout", required_argument, 0, 't'},
 467                 {"port", required_argument, 0, 'p'},
 468                 {"from", required_argument, 0, 'f'},
 469                 {"fqdn", required_argument, 0, 'F'},
 470                 {"authtype", required_argument, 0, 'A'},
 471                 {"authuser", required_argument, 0, 'U'},
 472                 {"authpass", required_argument, 0, 'P'},
 473                 {"command", required_argument, 0, 'C'},
 474                 {"response", required_argument, 0, 'R'},
 475                 {"nocommand", required_argument, 0, 'n'},
 476                 {"verbose", no_argument, 0, 'v'},
 477                 {"version", no_argument, 0, 'V'},
 478                 {"use-ipv4", no_argument, 0, '4'},
 479                 {"use-ipv6", no_argument, 0, '6'},
 480                 {"help", no_argument, 0, 'h'},
 481                 {"starttls",no_argument,0,'S'},
 482                 {"certificate",required_argument,0,'D'},
 483                 {0, 0, 0, 0}
 484         };
 485
 486         if (argc < 2)
 487                 return ERROR;
 488
 489         for (c = 1; c < argc; c++) {
 490                 if (strcmp ("-to", argv[c]) == 0)
 491                         strcpy (argv[c], "-t");
 492                 else if (strcmp ("-wt", argv[c]) == 0)
 493                         strcpy (argv[c], "-w");
 494                 else if (strcmp ("-ct", argv[c]) == 0)
 495                         strcpy (argv[c], "-c");
 496         }
 497
 498         while (1) {
 499                 c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:R:SD:F:A:U:P:",
 500                                  longopts, &option);
 501
 502                 if (c == -1 || c == EOF)
 503                         break;
 504
 505                 switch (c) {
 506                 case 'H':                                                                       /* hostname */
 507                         if (is_host (optarg)) {
 508                                 server_address = optarg;
 509                         }
 510                         else {
 511                                 usage2 (_("Invalid hostname/address"), optarg);
 512                         }
 513                         break;
 514                 case 'p':                                                                       /* port */
 515                         if (is_intpos (optarg))
 516                                 server_port = atoi (optarg);
 517                         else
 518                                 usage4 (_("Port must be a positive integer"));
 519                         break;
 520                 case 'F':
 521                 /* localhostname */
 522                         localhostname = strdup(optarg);
 523                         break;
 524                 case 'f':                                                                       /* from argument */
 525                         from_arg = optarg;
 526                         smtp_use_dummycmd = 1;
 527                         break;
 528                 case 'A':
 529                         authtype = optarg;
 530                         break;
 531                 case 'U':
 532                         authuser = optarg;
 533                         break;
 534                 case 'P':
 535                         authpass = optarg;
 536                         break;
 537                 case 'e':                                                                       /* server expect string on 220  */
 538                         server_expect = optarg;
 539                         break;
 540                 case 'C':                                                                       /* commands  */
 541                         if (ncommands >= command_size) {
 542                                 commands = realloc (commands, command_size+8);
 543                                 if (commands == NULL)
 544                                         die (STATE_UNKNOWN,
 545                                              _("Could not realloc() units [%d]\n"), ncommands);
 546                         }
 547                         commands[ncommands] = optarg;
 548                         ncommands++;
 549                         break;
 550                 case 'R':                                                                       /* server responses */
 551                         if (nresponses >= response_size) {
 552                                 responses = realloc (responses, response_size+8);
 553                                 if (responses == NULL)
 554                                         die (STATE_UNKNOWN,
 555                                              _("Could not realloc() units [%d]\n"), nresponses);
 556                         }
 557                         responses[nresponses] = optarg;
 558                         nresponses++;
 559                         break;
 560                 case 'c':                                                                       /* critical time threshold */
 561                         if (is_intnonneg (optarg)) {
 562                                 critical_time = atoi (optarg);
 563                                 check_critical_time = TRUE;
 564                         }
 565                         else {
 566                                 usage4 (_("Critical time must be a positive integer"));
 567                         }
 568                         break;
 569                 case 'w':                                                                       /* warning time threshold */
 570                         if (is_intnonneg (optarg)) {
 571                                 warning_time = atoi (optarg);
 572                                 check_warning_time = TRUE;
 573                         }
 574                         else {
 575                                 usage4 (_("Warning time must be a positive integer"));
 576                         }
 577                         break;
 578                 case 'v':                                                                       /* verbose */
 579                         verbose++;
 580                         break;
 581                 case 't':                                                                       /* timeout */
 582                         if (is_intnonneg (optarg)) {
 583                                 socket_timeout = atoi (optarg);
 584                         }
 585                         else {
 586                                 usage4 (_("Timeout interval must be a positive integer"));
 587                         }
 588                         break;
 589                 case 'S':
 590                 /* starttls */
 591                         use_ssl = TRUE;
 592                         use_ehlo = TRUE;
 593                         break;
 594                 case 'D':
 595                 /* Check SSL cert validity */
 596 #ifdef USE_OPENSSL
 597                         if (!is_intnonneg (optarg))
 598                                 usage2 ("Invalid certificate expiration period",optarg);
 599                                 days_till_exp = atoi (optarg);
 600                                 check_cert = TRUE;
 601 #else
 602                                 usage (_("SSL support not available - install OpenSSL and recompile"));
 603 #endif
 604                         break;
 605                 case '4':
 606                         address_family = AF_INET;
 607                         break;
 608                 case '6':
 609 #ifdef USE_IPV6
 610                         address_family = AF_INET6;
 611 #else
 612                         usage4 (_("IPv6 support not available"));
 613 #endif
 614                         break;
 615                 case 'V':                                                                       /* version */
 616                         print_revision (progname, revision);
 617                         exit (STATE_OK);
 618                 case 'h':                                                                       /* help */
 619                         print_help ();
 620                         exit (STATE_OK);
 621                 case '?':                                                                       /* help */
 622                         usage2 (_("Unknown argument"), optarg);
 623                 }
 624         }
 625
 626         c = optind;
 627         if (server_address == NULL) {
 628                 if (argv[c]) {
 629                         if (is_host (argv[c]))
 630                                 server_address = argv[c];
 631                         else
 632                                 usage2 (_("Invalid hostname/address"), argv[c]);
 633                 }
 634                 else {
 635                         asprintf (&server_address, "127.0.0.1");
 636                 }
 637         }
 638
 639         if (server_expect == NULL)
 640                 server_expect = strdup (SMTP_EXPECT);
 641
 642         if (mail_command == NULL)
 643                 mail_command = strdup("MAIL ");
 644
 645         if (from_arg==NULL)
 646                 from_arg = strdup(" ");
 647
 648         return validate_arguments ();
 649 }
 650
 651
 652
 653 int
 654 validate_arguments (void)
 655 {
 656         return OK;
 657 }
 658
 659
 660
 661 void
 662 print_help (void)
 663 {
 664         char *myport;
 665         asprintf (&myport, "%d", SMTP_PORT);
 666
 667         print_revision (progname, revision);
 668
 669         printf ("Copyright (c) 1999-2001 Ethan Galstad <nagios@nagios.org>\n");
 670         printf (COPYRIGHT, copyright, email);
 671
 672         printf(_("This plugin will attempt to open an SMTP connection with the host.\n\n"));
 673
 674         print_usage ();
 675
 676         printf (_(UT_HELP_VRSN));
 677
 678         printf (_(UT_HOST_PORT), 'p', myport);
 679
 680         printf (_(UT_IPv46));
 681
 682         printf (_("\
 683  -e, --expect=STRING\n\
 684    String to expect in first line of server response (default: '%s')\n\
 685  -n, nocommand\n\
 686    Suppress SMTP command\n\
 687  -C, --command=STRING\n\
 688    SMTP command (may be used repeatedly)\n\
 689  -R, --command=STRING\n\
 690    Expected response to command (may be used repeatedly)\n\
 691  -f, --from=STRING\n\
 692    FROM-address to include in MAIL command, required by Exchange 2000\n"),
 693                 SMTP_EXPECT);
 694 #ifdef HAVE_SSL
 695         printf (_("\
 696  -D, --certificate=INTEGER\n\
 697     Minimum number of days a certificate has to be valid.\n\
 698  -S, --starttls\n\
 699     Use STARTTLS for the connection.\n"));
 700 #endif
 701
 702         printf("\
 703  -A, --authtype=STRING\n\
 704    SMTP AUTH type to check (default none, only LOGIN supported)\n\
 705  -U, --authuser=STRING\n\
 706    SMTP AUTH username\n\
 707  -P, --authpass=STRING\n\
 708    SMTP AUTH password\n\
 709                         ");
 710
 711         printf (_(UT_WARN_CRIT));
 712
 713         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 714
 715         printf (_(UT_VERBOSE));
 716
 717         printf(_("\n\
 718 Successul connects return STATE_OK, refusals and timeouts return\n\
 719 STATE_CRITICAL, other errors return STATE_UNKNOWN.  Successful\n\
 720 connects, but incorrect reponse messages from the host result in\n\
 721 STATE_WARNING return values.\n"));
 722
 723         printf (_(UT_SUPPORT));
 724 }
 725
 726
 727
 728 void
 729 print_usage (void)
 730 {
 731         printf ("\
 732 Usage: %s -H host [-p port] [-e expect] [-C command] [-f from addr]\n\
 733                   [-A authtype -U authuser -P authpass]\n\
 734                   [-w warn] [-c crit] [-t timeout] [-S] [-D days] [-n] [-v] [-4|-6]\n", progname);
 735 }
 736
 737 int
 738 my_close (void)
 739 {
 740 #ifdef HAVE_SSL
 741         np_net_ssl_cleanup();
 742 #endif
 743         return close(sd);
 744 }