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