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 void smtp_quit(void);
  78 int my_close(void);
  79
  80 #include "regex.h"
  81 char regex_expect[MAX_INPUT_BUFFER] = "";
  82 regex_t preg;
  83 regmatch_t pmatch[10];
  84 char timestamp[20] = "";
  85 char errbuf[MAX_INPUT_BUFFER];
  86 int cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
  87 int eflags = 0;
  88 int errcode, excode;
  89
  90 int server_port = SMTP_PORT;
  91 char *server_address = NULL;
  92 char *server_expect = NULL;
  93 int smtp_use_dummycmd = 0;
  94 char *mail_command = NULL;
  95 char *from_arg = NULL;
  96 int ncommands=0;
  97 int command_size=0;
  98 int nresponses=0;
  99 int response_size=0;
 100 char **commands = NULL;
 101 char **responses = NULL;
 102 char *authtype = NULL;
 103 char *authuser = NULL;
 104 char *authpass = NULL;
 105 int warning_time = 0;
 106 int check_warning_time = FALSE;
 107 int critical_time = 0;
 108 int check_critical_time = FALSE;
 109 int verbose = 0;
 110 int use_ssl = FALSE;
 111 short use_ehlo = FALSE;
 112 short ssl_established = 0;
 113 char *localhostname = NULL;
 114 int sd;
 115 char buffer[MAX_INPUT_BUFFER];
 116 enum {
 117   TCP_PROTOCOL = 1,
 118   UDP_PROTOCOL = 2,
 119   MAXBUF = 1024
 120 };
 121
 122 /* written by lauri alanko */
 123 static char *
 124 base64 (const char *bin, size_t len)
 125 {
 126
 127         char *buf = (char *) malloc ((len + 2) / 3 * 4 + 1);
 128         size_t i = 0, j = 0;
 129
 130         char BASE64_END = '=';
 131         char base64_table[64];
 132         strncpy (base64_table, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/", 64);
 133
 134         while (j < len - 2) {
 135                 buf[i++] = base64_table[bin[j] >> 2];
 136                 buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
 137                 buf[i++] = base64_table[((bin[j + 1] & 15) << 2) | (bin[j + 2] >> 6)];
 138                 buf[i++] = base64_table[bin[j + 2] & 63];
 139                 j += 3;
 140         }
 141
 142         switch (len - j) {
 143         case 1:
 144                 buf[i++] = base64_table[bin[j] >> 2];
 145                 buf[i++] = base64_table[(bin[j] & 3) << 4];
 146                 buf[i++] = BASE64_END;
 147                 buf[i++] = BASE64_END;
 148                 break;
 149         case 2:
 150                 buf[i++] = base64_table[bin[j] >> 2];
 151                 buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
 152                 buf[i++] = base64_table[(bin[j + 1] & 15) << 2];
 153                 buf[i++] = BASE64_END;
 154                 break;
 155         case 0:
 156                 break;
 157         }
 158
 159         buf[i] = '\0';
 160         return buf;
 161 }
 162
 163 int
 164 main (int argc, char **argv)
 165 {
 166         short supports_tls=FALSE;
 167         int n = 0;
 168         double elapsed_time;
 169         long microsec;
 170         int result = STATE_UNKNOWN;
 171         char *cmd_str = NULL;
 172         char *helocmd = NULL;
 173         char *error_msg = "";
 174         struct timeval tv;
 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         /* If localhostname not set on command line, use gethostname to set */
 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         }
 195         if(use_ehlo)
 196                 asprintf (&helocmd, "%s%s%s", SMTP_EHLO, localhostname, "\r\n");
 197         else
 198                 asprintf (&helocmd, "%s%s%s", SMTP_HELO, localhostname, "\r\n");
 199
 200         if (verbose)
 201                 printf("HELOCMD: %s", helocmd);
 202
 203         /* initialize the MAIL command with optional FROM command  */
 204         asprintf (&cmd_str, "%sFROM: %s%s", mail_command, from_arg, "\r\n");
 205
 206         if (verbose && smtp_use_dummycmd)
 207                 printf ("FROM CMD: %s", cmd_str);
 208
 209         /* initialize alarm signal handling */
 210         (void) signal (SIGALRM, socket_timeout_alarm_handler);
 211
 212         /* set socket timeout */
 213         (void) alarm (socket_timeout);
 214
 215         /* start timer */
 216         gettimeofday (&tv, NULL);
 217
 218         /* try to connect to the host at the given port number */
 219         result = my_tcp_connect (server_address, server_port, &sd);
 220
 221         if (result == STATE_OK) { /* we connected */
 222
 223                 /* watch for the SMTP connection string and */
 224                 /* return a WARNING status if we couldn't read any data */
 225                 if (recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0) == -1) {
 226                         printf (_("recv() failed\n"));
 227                         result = STATE_WARNING;
 228                 }
 229                 else {
 230                         if (verbose)
 231                                 printf ("%s", buffer);
 232                         /* strip the buffer of carriage returns */
 233                         strip (buffer);
 234                         /* make sure we find the response we are looking for */
 235                         if (!strstr (buffer, server_expect)) {
 236                                 if (server_port == SMTP_PORT)
 237                                         printf (_("Invalid SMTP response received from host\n"));
 238                                 else
 239                                         printf (_("Invalid SMTP response received from host on port %d\n"),
 240                                                                         server_port);
 241                                 result = STATE_WARNING;
 242                         }
 243                 }
 244
 245                 /* send the HELO/EHLO command */
 246                 send(sd, helocmd, strlen(helocmd), 0);
 247
 248                 /* allow for response to helo command to reach us */
 249                 if(read (sd, buffer, MAXBUF - 1) < 0){
 250                         printf (_("recv() failed\n"));
 251                         return STATE_WARNING;
 252                 } else if(use_ehlo){
 253                         buffer[MAXBUF-1]='\0';
 254                         if(strstr(buffer, "250 STARTTLS") != NULL ||
 255                            strstr(buffer, "250-STARTTLS") != NULL){
 256                                 supports_tls=TRUE;
 257                         }
 258                 }
 259
 260                 if(use_ssl && ! supports_tls){
 261                         printf(_("WARNING - TLS not supported by server\n"));
 262                         smtp_quit();
 263                         return STATE_WARNING;
 264                 }
 265
 266 #ifdef HAVE_SSL
 267                 if(use_ssl) {
 268                   /* send the STARTTLS command */
 269                   send(sd, SMTP_STARTTLS, strlen(SMTP_STARTTLS), 0);
 270
 271                   recv(sd,buffer, MAX_INPUT_BUFFER-1, 0); /* wait for it */
 272                   if (!strstr (buffer, server_expect)) {
 273                     printf (_("Server does not support STARTTLS\n"));
 274                     smtp_quit();
 275                     return STATE_UNKNOWN;
 276                   }
 277                   result = np_net_ssl_init(sd);
 278                   if(result != STATE_OK) {
 279                     printf (_("CRITICAL - Cannot create SSL context.\n"));
 280                     np_net_ssl_cleanup();
 281                     close(sd);
 282                     return STATE_CRITICAL;
 283                   } else {
 284                         ssl_established = 1;
 285                   }
 286
 287                 /*
 288                  * Resend the EHLO command.
 289                  *
 290                  * RFC 3207 (4.2) says: ``The client MUST discard any knowledge
 291                  * obtained from the server, such as the list of SMTP service
 292                  * extensions, which was not obtained from the TLS negotiation
 293                  * itself.  The client SHOULD send an EHLO command as the first
 294                  * command after a successful TLS negotiation.''  For this
 295                  * reason, some MTAs will not allow an AUTH LOGIN command before
 296                  * we resent EHLO via TLS.
 297                  */
 298                 if (my_send(helocmd, strlen(helocmd)) <= 0) {
 299                         printf("%s\n", _("SMTP UNKNOWN - Cannot send EHLO command via TLS."));
 300                         my_close();
 301                         return STATE_UNKNOWN;
 302                 }
 303                 if (verbose)
 304                         printf(_("sent %s"), helocmd);
 305                 if ((n = my_recv(buffer, MAX_INPUT_BUFFER - 1)) <= 0) {
 306                         printf("%s\n", _("SMTP UNKNOWN - Cannot read EHLO response via TLS."));
 307                         my_close();
 308                         return STATE_UNKNOWN;
 309                 }
 310                 if (verbose) {
 311                         buffer[n] = '\0';
 312                         printf("%s", buffer);
 313                 }
 314
 315 #  ifdef USE_OPENSSL
 316                   if ( check_cert ) {
 317                     result = np_net_ssl_check_cert(days_till_exp);
 318                     if(result != STATE_OK){
 319                       printf ("%s\n", _("CRITICAL - Cannot retrieve server certificate."));
 320                     }
 321                     my_close();
 322                     return result;
 323                   }
 324 #  endif /* USE_OPENSSL */
 325                 }
 326 #endif
 327
 328                 /* sendmail will syslog a "NOQUEUE" error if session does not attempt
 329                  * to do something useful. This can be prevented by giving a command
 330                  * even if syntax is illegal (MAIL requires a FROM:<...> argument)
 331                  *
 332                  * According to rfc821 you can include a null reversepath in the from command
 333                  * - but a log message is generated on the smtp server.
 334                  *
 335                  * You can disable sending mail_command with '--nocommand'
 336                  * Use the -f option to provide a FROM address
 337                  */
 338                 if (smtp_use_dummycmd) {
 339                   my_send(cmd_str, strlen(cmd_str));
 340                   my_recv(buffer, MAX_INPUT_BUFFER-1);
 341                   if (verbose)
 342                     printf("%s", buffer);
 343                 }
 344
 345                 while (n < ncommands) {
 346                         asprintf (&cmd_str, "%s%s", commands[n], "\r\n");
 347                         my_send(cmd_str, strlen(cmd_str));
 348                         my_recv(buffer, MAX_INPUT_BUFFER-1);
 349                         if (verbose)
 350                                 printf("%s", buffer);
 351                         strip (buffer);
 352                         if (n < nresponses) {
 353                                 cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
 354                                 errcode = regcomp (&preg, responses[n], cflags);
 355                                 if (errcode != 0) {
 356                                         regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
 357                                         printf (_("Could Not Compile Regular Expression"));
 358                                         return ERROR;
 359                                 }
 360                                 excode = regexec (&preg, buffer, 10, pmatch, eflags);
 361                                 if (excode == 0) {
 362                                         result = STATE_OK;
 363                                 }
 364                                 else if (excode == REG_NOMATCH) {
 365                                         result = STATE_WARNING;
 366                                         printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]);
 367                                 }
 368                                 else {
 369                                         regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER);
 370                                         printf (_("Execute Error: %s\n"), errbuf);
 371                                         result = STATE_UNKNOWN;
 372                                 }
 373                         }
 374                         n++;
 375                 }
 376
 377                 if (authtype != NULL) {
 378                         if (strcmp (authtype, "LOGIN") == 0) {
 379                                 char *abuf;
 380                                 int ret;
 381                                 do {
 382                                         if (authuser == NULL) {
 383                                                 result = STATE_CRITICAL;
 384                                                 asprintf(&error_msg, _("no authuser specified, "));
 385                                                 break;
 386                                         }
 387                                         if (authpass == NULL) {
 388                                                 result = STATE_CRITICAL;
 389                                                 asprintf(&error_msg, _("no authpass specified, "));
 390                                                 break;
 391                                         }
 392
 393                                         /* send AUTH LOGIN */
 394                                         my_send(SMTP_AUTH_LOGIN, strlen(SMTP_AUTH_LOGIN));
 395                                         if (verbose)
 396                                                 printf (_("sent %s\n"), "AUTH LOGIN");
 397
 398                                         if((ret = my_recv(buffer, MAXBUF - 1)) < 0){
 399                                                 asprintf(&error_msg, _("recv() failed after AUTH LOGIN, "));
 400                                                 result = STATE_WARNING;
 401                                                 break;
 402                                         }
 403                                         buffer[ret] = 0;
 404                                         if (verbose)
 405                                                 printf (_("received %s\n"), buffer);
 406
 407                                         if (strncmp (buffer, "334", 3) != 0) {
 408                                                 result = STATE_CRITICAL;
 409                                                 asprintf(&error_msg, _("invalid response received after AUTH LOGIN, "));
 410                                                 break;
 411                                         }
 412
 413                                         /* encode authuser with base64 */
 414                                         abuf = base64 (authuser, strlen(authuser));
 415                                         strcat (abuf, "\r\n");
 416                                         my_send(abuf, strlen(abuf));
 417                                         if (verbose)
 418                                                 printf (_("sent %s\n"), abuf);
 419
 420                                         if ((ret = my_recv(buffer, MAX_INPUT_BUFFER-1)) == -1) {
 421                                                 result = STATE_CRITICAL;
 422                                                 asprintf(&error_msg, _("recv() failed after sending authuser, "));
 423                                                 break;
 424                                         }
 425                                         buffer[ret] = 0;
 426                                         if (verbose) {
 427                                                 printf (_("received %s\n"), buffer);
 428                                         }
 429                                         if (strncmp (buffer, "334", 3) != 0) {
 430                                                 result = STATE_CRITICAL;
 431                                                 asprintf(&error_msg, _("invalid response received after authuser, "));
 432                                                 break;
 433                                         }
 434                                         /* encode authpass with base64 */
 435                                         abuf = base64 (authpass, strlen(authpass));
 436                                         strcat (abuf, "\r\n");
 437                                         my_send(abuf, strlen(abuf));
 438                                         if (verbose) {
 439                                                 printf (_("sent %s\n"), abuf);
 440                                         }
 441                                         if ((ret = my_recv(buffer, MAX_INPUT_BUFFER-1)) == -1) {
 442                                                 result = STATE_CRITICAL;
 443                                                 asprintf(&error_msg, _("recv() failed after sending authpass, "));
 444                                                 break;
 445                                         }
 446                                         buffer[ret] = 0;
 447                                         if (verbose) {
 448                                                 printf (_("received %s\n"), buffer);
 449                                         }
 450                                         if (strncmp (buffer, "235", 3) != 0) {
 451                                                 result = STATE_CRITICAL;
 452                                                 asprintf(&error_msg, _("invalid response received after authpass, "));
 453                                                 break;
 454                                         }
 455                                         break;
 456                                 } while (0);
 457                         } else {
 458                                 result = STATE_CRITICAL;
 459                                 asprintf(&error_msg, _("only authtype LOGIN is supported, "));
 460                         }
 461                 }
 462
 463                 /* tell the server we're done */
 464                 smtp_quit();
 465
 466                 /* finally close the connection */
 467                 close (sd);
 468         }
 469
 470         /* reset the alarm */
 471         alarm (0);
 472
 473         microsec = deltime (tv);
 474         elapsed_time = (double)microsec / 1.0e6;
 475
 476         if (result == STATE_OK) {
 477                 if (check_critical_time && elapsed_time > (double) critical_time)
 478                         result = STATE_CRITICAL;
 479                 else if (check_warning_time && elapsed_time > (double) warning_time)
 480                         result = STATE_WARNING;
 481         }
 482
 483         printf (_("SMTP %s - %s%.3f sec. response time%s%s|%s\n"),
 484                         state_text (result),
 485                         error_msg,
 486                         elapsed_time,
 487                         verbose?", ":"", verbose?buffer:"",
 488                         fperfdata ("time", elapsed_time, "s",
 489                                 (int)check_warning_time, warning_time,
 490                                 (int)check_critical_time, critical_time,
 491                                 TRUE, 0, FALSE, 0));
 492
 493         return result;
 494 }
 495
 496
 497
 498 /* process command-line arguments */
 499 int
 500 process_arguments (int argc, char **argv)
 501 {
 502         int c;
 503
 504         int option = 0;
 505         static struct option longopts[] = {
 506                 {"hostname", required_argument, 0, 'H'},
 507                 {"expect", required_argument, 0, 'e'},
 508                 {"critical", required_argument, 0, 'c'},
 509                 {"warning", required_argument, 0, 'w'},
 510                 {"timeout", required_argument, 0, 't'},
 511                 {"port", required_argument, 0, 'p'},
 512                 {"from", required_argument, 0, 'f'},
 513                 {"fqdn", required_argument, 0, 'F'},
 514                 {"authtype", required_argument, 0, 'A'},
 515                 {"authuser", required_argument, 0, 'U'},
 516                 {"authpass", required_argument, 0, 'P'},
 517                 {"command", required_argument, 0, 'C'},
 518                 {"response", required_argument, 0, 'R'},
 519                 {"nocommand", required_argument, 0, 'n'},
 520                 {"verbose", no_argument, 0, 'v'},
 521                 {"version", no_argument, 0, 'V'},
 522                 {"use-ipv4", no_argument, 0, '4'},
 523                 {"use-ipv6", no_argument, 0, '6'},
 524                 {"help", no_argument, 0, 'h'},
 525                 {"starttls",no_argument,0,'S'},
 526                 {"certificate",required_argument,0,'D'},
 527                 {0, 0, 0, 0}
 528         };
 529
 530         if (argc < 2)
 531                 return ERROR;
 532
 533         for (c = 1; c < argc; c++) {
 534                 if (strcmp ("-to", argv[c]) == 0)
 535                         strcpy (argv[c], "-t");
 536                 else if (strcmp ("-wt", argv[c]) == 0)
 537                         strcpy (argv[c], "-w");
 538                 else if (strcmp ("-ct", argv[c]) == 0)
 539                         strcpy (argv[c], "-c");
 540         }
 541
 542         while (1) {
 543                 c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:R:SD:F:A:U:P:",
 544                                  longopts, &option);
 545
 546                 if (c == -1 || c == EOF)
 547                         break;
 548
 549                 switch (c) {
 550                 case 'H':                                                                       /* hostname */
 551                         if (is_host (optarg)) {
 552                                 server_address = optarg;
 553                         }
 554                         else {
 555                                 usage2 (_("Invalid hostname/address"), optarg);
 556                         }
 557                         break;
 558                 case 'p':                                                                       /* port */
 559                         if (is_intpos (optarg))
 560                                 server_port = atoi (optarg);
 561                         else
 562                                 usage4 (_("Port must be a positive integer"));
 563                         break;
 564                 case 'F':
 565                 /* localhostname */
 566                         localhostname = strdup(optarg);
 567                         break;
 568                 case 'f':                                                                       /* from argument */
 569                         from_arg = optarg;
 570                         smtp_use_dummycmd = 1;
 571                         break;
 572                 case 'A':
 573                         authtype = optarg;
 574                         break;
 575                 case 'U':
 576                         authuser = optarg;
 577                         break;
 578                 case 'P':
 579                         authpass = optarg;
 580                         break;
 581                 case 'e':                                                                       /* server expect string on 220  */
 582                         server_expect = optarg;
 583                         break;
 584                 case 'C':                                                                       /* commands  */
 585                         if (ncommands >= command_size) {
 586                                 command_size+=8;
 587                                 commands = realloc (commands, sizeof(char *) * command_size);
 588                                 if (commands == NULL)
 589                                         die (STATE_UNKNOWN,
 590                                              _("Could not realloc() units [%d]\n"), ncommands);
 591                         }
 592                         commands[ncommands] = (char *) malloc (sizeof(char) * 255);
 593                         strncpy (commands[ncommands], optarg, 255);
 594                         ncommands++;
 595                         break;
 596                 case 'R':                                                                       /* server responses */
 597                         if (nresponses >= response_size) {
 598                                 response_size += 8;
 599                                 responses = realloc (responses, sizeof(char *) * response_size);
 600                                 if (responses == NULL)
 601                                         die (STATE_UNKNOWN,
 602                                              _("Could not realloc() units [%d]\n"), nresponses);
 603                         }
 604                         responses[nresponses] = (char *) malloc (sizeof(char) * 255);
 605                         strncpy (responses[nresponses], optarg, 255);
 606                         nresponses++;
 607                         break;
 608                 case 'c':                                                                       /* critical time threshold */
 609                         if (is_intnonneg (optarg)) {
 610                                 critical_time = atoi (optarg);
 611                                 check_critical_time = TRUE;
 612                         }
 613                         else {
 614                                 usage4 (_("Critical time must be a positive integer"));
 615                         }
 616                         break;
 617                 case 'w':                                                                       /* warning time threshold */
 618                         if (is_intnonneg (optarg)) {
 619                                 warning_time = atoi (optarg);
 620                                 check_warning_time = TRUE;
 621                         }
 622                         else {
 623                                 usage4 (_("Warning time must be a positive integer"));
 624                         }
 625                         break;
 626                 case 'v':                                                                       /* verbose */
 627                         verbose++;
 628                         break;
 629                 case 't':                                                                       /* timeout */
 630                         if (is_intnonneg (optarg)) {
 631                                 socket_timeout = atoi (optarg);
 632                         }
 633                         else {
 634                                 usage4 (_("Timeout interval must be a positive integer"));
 635                         }
 636                         break;
 637                 case 'S':
 638                 /* starttls */
 639                         use_ssl = TRUE;
 640                         use_ehlo = TRUE;
 641                         break;
 642                 case 'D':
 643                 /* Check SSL cert validity */
 644 #ifdef USE_OPENSSL
 645                         if (!is_intnonneg (optarg))
 646                                 usage2 ("Invalid certificate expiration period",optarg);
 647                                 days_till_exp = atoi (optarg);
 648                                 check_cert = TRUE;
 649 #else
 650                                 usage (_("SSL support not available - install OpenSSL and recompile"));
 651 #endif
 652                         break;
 653                 case '4':
 654                         address_family = AF_INET;
 655                         break;
 656                 case '6':
 657 #ifdef USE_IPV6
 658                         address_family = AF_INET6;
 659 #else
 660                         usage4 (_("IPv6 support not available"));
 661 #endif
 662                         break;
 663                 case 'V':                                                                       /* version */
 664                         print_revision (progname, revision);
 665                         exit (STATE_OK);
 666                 case 'h':                                                                       /* help */
 667                         print_help ();
 668                         exit (STATE_OK);
 669                 case '?':                                                                       /* help */
 670                         usage5 ();
 671                 }
 672         }
 673
 674         c = optind;
 675         if (server_address == NULL) {
 676                 if (argv[c]) {
 677                         if (is_host (argv[c]))
 678                                 server_address = argv[c];
 679                         else
 680                                 usage2 (_("Invalid hostname/address"), argv[c]);
 681                 }
 682                 else {
 683                         asprintf (&server_address, "127.0.0.1");
 684                 }
 685         }
 686
 687         if (server_expect == NULL)
 688                 server_expect = strdup (SMTP_EXPECT);
 689
 690         if (mail_command == NULL)
 691                 mail_command = strdup("MAIL ");
 692
 693         if (from_arg==NULL)
 694                 from_arg = strdup(" ");
 695
 696         return validate_arguments ();
 697 }
 698
 699
 700
 701 int
 702 validate_arguments (void)
 703 {
 704         return OK;
 705 }
 706
 707
 708 void
 709 smtp_quit(void)
 710 {
 711         int bytes;
 712
 713         my_send(SMTP_QUIT, strlen(SMTP_QUIT));
 714         if (verbose)
 715                 printf(_("sent %s\n"), "QUIT");
 716
 717         /* read the response but don't care about problems */
 718         bytes = my_recv(buffer, MAXBUF - 1);
 719         if (verbose) {
 720                 if (bytes < 0)
 721                         printf(_("recv() failed after QUIT."));
 722                 else if (bytes == 0)
 723                         printf(_("Connection reset by peer."));
 724                 else {
 725                         buffer[bytes] = '\0';
 726                         printf(_("received %s\n"), buffer);
 727                 }
 728         }
 729 }
 730
 731
 732 int
 733 my_close (void)
 734 {
 735 #ifdef HAVE_SSL
 736   np_net_ssl_cleanup();
 737 #endif
 738   return close(sd);
 739 }
 740
 741
 742 void
 743 print_help (void)
 744 {
 745         char *myport;
 746         asprintf (&myport, "%d", SMTP_PORT);
 747
 748         print_revision (progname, revision);
 749
 750         printf ("Copyright (c) 1999-2001 Ethan Galstad <nagios@nagios.org>\n");
 751         printf (COPYRIGHT, copyright, email);
 752
 753         printf("%s\n", _("This plugin will attempt to open an SMTP connection with the host."));
 754
 755   printf ("\n\n");
 756
 757         print_usage ();
 758
 759         printf (_(UT_HELP_VRSN));
 760
 761         printf (_(UT_HOST_PORT), 'p', myport);
 762
 763         printf (_(UT_IPv46));
 764
 765         printf (" %s\n", "-e, --expect=STRING");
 766   printf (_("    String to expect in first line of server response (default: '%s')\n"), SMTP_EXPECT);
 767   printf (" %s\n", "-n, nocommand");
 768   printf ("    %s\n", _("Suppress SMTP command"));
 769   printf (" %s\n", "-C, --command=STRING");
 770   printf ("    %s\n", _("SMTP command (may be used repeatedly)"));
 771   printf (" %s\n", "-R, --command=STRING");
 772   printf ("    %s\n", _("Expected response to command (may be used repeatedly)"));
 773   printf (" %s\n", "-f, --from=STRING");
 774   printf ("    %s\n", _("FROM-address to include in MAIL command, required by Exchange 2000")),
 775 #ifdef HAVE_SSL
 776   printf (" %s\n", "-D, --certificate=INTEGER");
 777   printf ("    %s\n", _("Minimum number of days a certificate has to be valid."));
 778   printf (" %s\n", "-S, --starttls");
 779   printf ("    %s\n", _("Use STARTTLS for the connection."));
 780 #endif
 781
 782         printf (" %s\n", "-A, --authtype=STRING");
 783   printf ("    %s\n", _("SMTP AUTH type to check (default none, only LOGIN supported)"));
 784   printf (" %s\n", "-U, --authuser=STRING");
 785   printf ("    %s\n", _("SMTP AUTH username"));
 786   printf (" %s\n", "-P, --authpass=STRING");
 787   printf ("    %s\n", _("SMTP AUTH password"));
 788
 789         printf (_(UT_WARN_CRIT));
 790
 791         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 792
 793         printf (_(UT_VERBOSE));
 794
 795         printf("\n");
 796         printf ("%s\n", _("Successul connects return STATE_OK, refusals and timeouts return"));
 797   printf ("%s\n", _("STATE_CRITICAL, other errors return STATE_UNKNOWN.  Successful"));
 798   printf ("%s\n", _("connects, but incorrect reponse messages from the host result in"));
 799   printf ("%s\n", _("STATE_WARNING return values."));
 800
 801         printf (_(UT_SUPPORT));
 802 }
 803
 804
 805
 806 void
 807 print_usage (void)
 808 {
 809   printf (_("Usage:"));
 810         printf ("%s -H host [-p port] [-e expect] [-C command] [-f from addr]", progname);
 811   printf ("[-A authtype -U authuser -P authpass] [-w warn] [-c crit] [-t timeout]\n");
 812   printf ("[-S] [-D days] [-n] [-v] [-4|-6]\n");
 813 }
 814