plugins/check_smtp.c

   1 /*****************************************************************************
   2 *
   3 * Nagios check_smtp plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 2000-2007 Nagios Plugins Development Team
   7 *
   8 * Description:
   9 *
  10 * This file contains the check_smtp plugin
  11 *
  12 * This plugin will attempt to open an SMTP connection with the host.
  13 *
  14 *
  15 * This program is free software: you can redistribute it and/or modify
  16 * it under the terms of the GNU General Public License as published by
  17 * the Free Software Foundation, either version 3 of the License, or
  18 * (at your option) any later version.
  19 *
  20 * This program is distributed in the hope that it will be useful,
  21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 * GNU General Public License for more details.
  24 *
  25 * You should have received a copy of the GNU General Public License
  26 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  27 *
  28 *
  29 *****************************************************************************/
  30
  31 const char *progname = "check_smtp";
  32 const char *copyright = "2000-2007";
  33 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  34
  35 #include "common.h"
  36 #include "netutils.h"
  37 #include "utils.h"
  38 #include "base64.h"
  39
  40 #include <ctype.h>
  41
  42 #ifdef HAVE_SSL
  43 int check_cert = FALSE;
  44 int days_till_exp_warn, days_till_exp_crit;
  45 #  define my_recv(buf, len) ((use_ssl && ssl_established) ? np_net_ssl_read(buf, len) : read(sd, buf, len))
  46 #  define my_send(buf, len) ((use_ssl && ssl_established) ? np_net_ssl_write(buf, len) : send(sd, buf, len, 0))
  47 #else /* ifndef HAVE_SSL */
  48 #  define my_recv(buf, len) read(sd, buf, len)
  49 #  define my_send(buf, len) send(sd, buf, len, 0)
  50 #endif
  51
  52 enum {
  53         SMTP_PORT       = 25
  54 };
  55 #define SMTP_EXPECT "220"
  56 #define SMTP_HELO "HELO "
  57 #define SMTP_EHLO "EHLO "
  58 #define SMTP_QUIT "QUIT\r\n"
  59 #define SMTP_STARTTLS "STARTTLS\r\n"
  60 #define SMTP_AUTH_LOGIN "AUTH LOGIN\r\n"
  61
  62 #ifndef HOST_MAX_BYTES
  63 #define HOST_MAX_BYTES 255
  64 #endif
  65
  66 #define EHLO_SUPPORTS_STARTTLS 1
  67
  68 int process_arguments (int, char **);
  69 int validate_arguments (void);
  70 void print_help (void);
  71 void print_usage (void);
  72 void smtp_quit(void);
  73 int recvline(char *, size_t);
  74 int recvlines(char *, size_t);
  75 int my_close(void);
  76
  77 #include "regex.h"
  78 char regex_expect[MAX_INPUT_BUFFER] = "";
  79 regex_t preg;
  80 regmatch_t pmatch[10];
  81 char timestamp[20] = "";
  82 char errbuf[MAX_INPUT_BUFFER];
  83 int cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
  84 int eflags = 0;
  85 int errcode, excode;
  86
  87 int server_port = SMTP_PORT;
  88 char *server_address = NULL;
  89 char *server_expect = NULL;
  90 int smtp_use_dummycmd = 0;
  91 char *mail_command = NULL;
  92 char *from_arg = NULL;
  93 int ncommands=0;
  94 int command_size=0;
  95 int nresponses=0;
  96 int response_size=0;
  97 char **commands = NULL;
  98 char **responses = NULL;
  99 char *authtype = NULL;
 100 char *authuser = NULL;
 101 char *authpass = NULL;
 102 int warning_time = 0;
 103 int check_warning_time = FALSE;
 104 int critical_time = 0;
 105 int check_critical_time = FALSE;
 106 int verbose = 0;
 107 int use_ssl = FALSE;
 108 short use_ehlo = FALSE;
 109 short ssl_established = 0;
 110 char *localhostname = NULL;
 111 int sd;
 112 char buffer[MAX_INPUT_BUFFER];
 113 enum {
 114   TCP_PROTOCOL = 1,
 115   UDP_PROTOCOL = 2,
 116 };
 117 int ignore_send_quit_failure = FALSE;
 118
 119
 120 int
 121 main (int argc, char **argv)
 122 {
 123         short supports_tls=FALSE;
 124         int n = 0;
 125         double elapsed_time;
 126         long microsec;
 127         int result = STATE_UNKNOWN;
 128         char *cmd_str = NULL;
 129         char *helocmd = NULL;
 130         char *error_msg = "";
 131         struct timeval tv;
 132
 133         /* Catch pipe errors in read/write - sometimes occurs when writing QUIT */
 134         (void) signal (SIGPIPE, SIG_IGN);
 135
 136         setlocale (LC_ALL, "");
 137         bindtextdomain (PACKAGE, LOCALEDIR);
 138         textdomain (PACKAGE);
 139
 140         /* Parse extra opts if any */
 141         argv=np_extra_opts (&argc, argv, progname);
 142
 143         if (process_arguments (argc, argv) == ERROR)
 144                 usage4 (_("Could not parse arguments"));
 145
 146         /* If localhostname not set on command line, use gethostname to set */
 147         if(! localhostname){
 148                 localhostname = malloc (HOST_MAX_BYTES);
 149                 if(!localhostname){
 150                         printf(_("malloc() failed!\n"));
 151                         return STATE_CRITICAL;
 152                 }
 153                 if(gethostname(localhostname, HOST_MAX_BYTES)){
 154                         printf(_("gethostname() failed!\n"));
 155                         return STATE_CRITICAL;
 156                 }
 157         }
 158         if(use_ehlo)
 159                 asprintf (&helocmd, "%s%s%s", SMTP_EHLO, localhostname, "\r\n");
 160         else
 161                 asprintf (&helocmd, "%s%s%s", SMTP_HELO, localhostname, "\r\n");
 162
 163         if (verbose)
 164                 printf("HELOCMD: %s", helocmd);
 165
 166         /* initialize the MAIL command with optional FROM command  */
 167         asprintf (&cmd_str, "%sFROM: %s%s", mail_command, from_arg, "\r\n");
 168
 169         if (verbose && smtp_use_dummycmd)
 170                 printf ("FROM CMD: %s", cmd_str);
 171
 172         /* initialize alarm signal handling */
 173         (void) signal (SIGALRM, socket_timeout_alarm_handler);
 174
 175         /* set socket timeout */
 176         (void) alarm (socket_timeout);
 177
 178         /* start timer */
 179         gettimeofday (&tv, NULL);
 180
 181         /* try to connect to the host at the given port number */
 182         result = my_tcp_connect (server_address, server_port, &sd);
 183
 184         if (result == STATE_OK) { /* we connected */
 185
 186                 /* watch for the SMTP connection string and */
 187                 /* return a WARNING status if we couldn't read any data */
 188                 if (recvlines(buffer, MAX_INPUT_BUFFER) <= 0) {
 189                         printf (_("recv() failed\n"));
 190                         return STATE_WARNING;
 191                 }
 192                 else {
 193                         if (verbose)
 194                                 printf ("%s", buffer);
 195                         /* strip the buffer of carriage returns */
 196                         strip (buffer);
 197                         /* make sure we find the response we are looking for */
 198                         if (!strstr (buffer, server_expect)) {
 199                                 if (server_port == SMTP_PORT)
 200                                         printf (_("Invalid SMTP response received from host: %s\n"), buffer);
 201                                 else
 202                                         printf (_("Invalid SMTP response received from host on port %d: %s\n"),
 203                                                                         server_port, buffer);
 204                                 return STATE_WARNING;
 205                         }
 206                 }
 207
 208                 /* send the HELO/EHLO command */
 209                 send(sd, helocmd, strlen(helocmd), 0);
 210
 211                 /* allow for response to helo command to reach us */
 212                 if (recvlines(buffer, MAX_INPUT_BUFFER) <= 0) {
 213                         printf (_("recv() failed\n"));
 214                         return STATE_WARNING;
 215                 } else if(use_ehlo){
 216                         if(strstr(buffer, "250 STARTTLS") != NULL ||
 217                            strstr(buffer, "250-STARTTLS") != NULL){
 218                                 supports_tls=TRUE;
 219                         }
 220                 }
 221
 222                 if(use_ssl && ! supports_tls){
 223                         printf(_("WARNING - TLS not supported by server\n"));
 224                         smtp_quit();
 225                         return STATE_WARNING;
 226                 }
 227
 228 #ifdef HAVE_SSL
 229                 if(use_ssl) {
 230                   /* send the STARTTLS command */
 231                   send(sd, SMTP_STARTTLS, strlen(SMTP_STARTTLS), 0);
 232
 233                   recvlines(buffer, MAX_INPUT_BUFFER); /* wait for it */
 234                   if (!strstr (buffer, server_expect)) {
 235                     printf (_("Server does not support STARTTLS\n"));
 236                     smtp_quit();
 237                     return STATE_UNKNOWN;
 238                   }
 239                   result = np_net_ssl_init(sd);
 240                   if(result != STATE_OK) {
 241                     printf (_("CRITICAL - Cannot create SSL context.\n"));
 242                     np_net_ssl_cleanup();
 243                     close(sd);
 244                     return STATE_CRITICAL;
 245                   } else {
 246                         ssl_established = 1;
 247                   }
 248
 249                 /*
 250                  * Resend the EHLO command.
 251                  *
 252                  * RFC 3207 (4.2) says: ``The client MUST discard any knowledge
 253                  * obtained from the server, such as the list of SMTP service
 254                  * extensions, which was not obtained from the TLS negotiation
 255                  * itself.  The client SHOULD send an EHLO command as the first
 256                  * command after a successful TLS negotiation.''  For this
 257                  * reason, some MTAs will not allow an AUTH LOGIN command before
 258                  * we resent EHLO via TLS.
 259                  */
 260                 if (my_send(helocmd, strlen(helocmd)) <= 0) {
 261                         printf("%s\n", _("SMTP UNKNOWN - Cannot send EHLO command via TLS."));
 262                         my_close();
 263                         return STATE_UNKNOWN;
 264                 }
 265                 if (verbose)
 266                         printf(_("sent %s"), helocmd);
 267                 if ((n = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
 268                         printf("%s\n", _("SMTP UNKNOWN - Cannot read EHLO response via TLS."));
 269                         my_close();
 270                         return STATE_UNKNOWN;
 271                 }
 272                 if (verbose) {
 273                         printf("%s", buffer);
 274                 }
 275
 276 #  ifdef USE_OPENSSL
 277                   if ( check_cert ) {
 278                     result = np_net_ssl_check_cert(days_till_exp_warn, days_till_exp_crit);
 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                  * Use the -f option to provide a FROM address
 294                  */
 295                 if (smtp_use_dummycmd) {
 296                   my_send(cmd_str, strlen(cmd_str));
 297                   if (recvlines(buffer, MAX_INPUT_BUFFER) >= 1 && 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                         if (recvlines(buffer, MAX_INPUT_BUFFER) >= 1 && verbose)
 305                                 printf("%s", buffer);
 306                         strip (buffer);
 307                         if (n < nresponses) {
 308                                 cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
 309                                 errcode = regcomp (&preg, responses[n], cflags);
 310                                 if (errcode != 0) {
 311                                         regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
 312                                         printf (_("Could Not Compile Regular Expression"));
 313                                         return ERROR;
 314                                 }
 315                                 excode = regexec (&preg, buffer, 10, pmatch, eflags);
 316                                 if (excode == 0) {
 317                                         result = STATE_OK;
 318                                 }
 319                                 else if (excode == REG_NOMATCH) {
 320                                         result = STATE_WARNING;
 321                                         printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]);
 322                                 }
 323                                 else {
 324                                         regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER);
 325                                         printf (_("Execute Error: %s\n"), errbuf);
 326                                         result = STATE_UNKNOWN;
 327                                 }
 328                         }
 329                         n++;
 330                 }
 331
 332                 if (authtype != NULL) {
 333                         if (strcmp (authtype, "LOGIN") == 0) {
 334                                 char *abuf;
 335                                 int ret;
 336                                 do {
 337                                         if (authuser == NULL) {
 338                                                 result = STATE_CRITICAL;
 339                                                 asprintf(&error_msg, _("no authuser specified, "));
 340                                                 break;
 341                                         }
 342                                         if (authpass == NULL) {
 343                                                 result = STATE_CRITICAL;
 344                                                 asprintf(&error_msg, _("no authpass specified, "));
 345                                                 break;
 346                                         }
 347
 348                                         /* send AUTH LOGIN */
 349                                         my_send(SMTP_AUTH_LOGIN, strlen(SMTP_AUTH_LOGIN));
 350                                         if (verbose)
 351                                                 printf (_("sent %s\n"), "AUTH LOGIN");
 352
 353                                         if ((ret = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
 354                                                 asprintf(&error_msg, _("recv() failed after AUTH LOGIN, "));
 355                                                 result = STATE_WARNING;
 356                                                 break;
 357                                         }
 358                                         if (verbose)
 359                                                 printf (_("received %s\n"), buffer);
 360
 361                                         if (strncmp (buffer, "334", 3) != 0) {
 362                                                 result = STATE_CRITICAL;
 363                                                 asprintf(&error_msg, _("invalid response received after AUTH LOGIN, "));
 364                                                 break;
 365                                         }
 366
 367                                         /* encode authuser with base64 */
 368                                         base64_encode_alloc (authuser, strlen(authuser), &abuf);
 369                                         /* FIXME: abuf shouldn't have enough space to strcat a '\r\n' into it. */
 370                                         strcat (abuf, "\r\n");
 371                                         my_send(abuf, strlen(abuf));
 372                                         if (verbose)
 373                                                 printf (_("sent %s\n"), abuf);
 374
 375                                         if ((ret = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
 376                                                 result = STATE_CRITICAL;
 377                                                 asprintf(&error_msg, _("recv() failed after sending authuser, "));
 378                                                 break;
 379                                         }
 380                                         if (verbose) {
 381                                                 printf (_("received %s\n"), buffer);
 382                                         }
 383                                         if (strncmp (buffer, "334", 3) != 0) {
 384                                                 result = STATE_CRITICAL;
 385                                                 asprintf(&error_msg, _("invalid response received after authuser, "));
 386                                                 break;
 387                                         }
 388                                         /* encode authpass with base64 */
 389                                         base64_encode_alloc (authpass, strlen(authpass), &abuf);
 390                                         /* FIXME: abuf shouldn't have enough space to strcat a '\r\n' into it. */
 391                                         strcat (abuf, "\r\n");
 392                                         my_send(abuf, strlen(abuf));
 393                                         if (verbose) {
 394                                                 printf (_("sent %s\n"), abuf);
 395                                         }
 396                                         if ((ret = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
 397                                                 result = STATE_CRITICAL;
 398                                                 asprintf(&error_msg, _("recv() failed after sending authpass, "));
 399                                                 break;
 400                                         }
 401                                         if (verbose) {
 402                                                 printf (_("received %s\n"), buffer);
 403                                         }
 404                                         if (strncmp (buffer, "235", 3) != 0) {
 405                                                 result = STATE_CRITICAL;
 406                                                 asprintf(&error_msg, _("invalid response received after authpass, "));
 407                                                 break;
 408                                         }
 409                                         break;
 410                                 } while (0);
 411                         } else {
 412                                 result = STATE_CRITICAL;
 413                                 asprintf(&error_msg, _("only authtype LOGIN is supported, "));
 414                         }
 415                 }
 416
 417                 /* tell the server we're done */
 418                 smtp_quit();
 419
 420                 /* finally close the connection */
 421                 close (sd);
 422         }
 423
 424         /* reset the alarm */
 425         alarm (0);
 426
 427         microsec = deltime (tv);
 428         elapsed_time = (double)microsec / 1.0e6;
 429
 430         if (result == STATE_OK) {
 431                 if (check_critical_time && elapsed_time > (double) critical_time)
 432                         result = STATE_CRITICAL;
 433                 else if (check_warning_time && elapsed_time > (double) warning_time)
 434                         result = STATE_WARNING;
 435         }
 436
 437         printf (_("SMTP %s - %s%.3f sec. response time%s%s|%s\n"),
 438                         state_text (result),
 439                         error_msg,
 440                         elapsed_time,
 441                         verbose?", ":"", verbose?buffer:"",
 442                         fperfdata ("time", elapsed_time, "s",
 443                                 (int)check_warning_time, warning_time,
 444                                 (int)check_critical_time, critical_time,
 445                                 TRUE, 0, FALSE, 0));
 446
 447         return result;
 448 }
 449
 450
 451
 452 /* process command-line arguments */
 453 int
 454 process_arguments (int argc, char **argv)
 455 {
 456         int c;
 457         char* temp;
 458
 459         int option = 0;
 460         static struct option longopts[] = {
 461                 {"hostname", required_argument, 0, 'H'},
 462                 {"expect", required_argument, 0, 'e'},
 463                 {"critical", required_argument, 0, 'c'},
 464                 {"warning", required_argument, 0, 'w'},
 465                 {"timeout", required_argument, 0, 't'},
 466                 {"port", required_argument, 0, 'p'},
 467                 {"from", required_argument, 0, 'f'},
 468                 {"fqdn", required_argument, 0, 'F'},
 469                 {"authtype", required_argument, 0, 'A'},
 470                 {"authuser", required_argument, 0, 'U'},
 471                 {"authpass", required_argument, 0, 'P'},
 472                 {"command", required_argument, 0, 'C'},
 473                 {"response", required_argument, 0, 'R'},
 474                 {"verbose", no_argument, 0, 'v'},
 475                 {"version", no_argument, 0, 'V'},
 476                 {"use-ipv4", no_argument, 0, '4'},
 477                 {"use-ipv6", no_argument, 0, '6'},
 478                 {"help", no_argument, 0, 'h'},
 479                 {"starttls",no_argument,0,'S'},
 480                 {"certificate",required_argument,0,'D'},
 481                 {"ignore-quit-failure",no_argument,0,'q'},
 482                 {0, 0, 0, 0}
 483         };
 484
 485         if (argc < 2)
 486                 return ERROR;
 487
 488         for (c = 1; c < argc; c++) {
 489                 if (strcmp ("-to", argv[c]) == 0)
 490                         strcpy (argv[c], "-t");
 491                 else if (strcmp ("-wt", argv[c]) == 0)
 492                         strcpy (argv[c], "-w");
 493                 else if (strcmp ("-ct", argv[c]) == 0)
 494                         strcpy (argv[c], "-c");
 495         }
 496
 497         while (1) {
 498                 c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:R:SD:F:A:U:P:q",
 499                                  longopts, &option);
 500
 501                 if (c == -1 || c == EOF)
 502                         break;
 503
 504                 switch (c) {
 505                 case 'H':                                                                       /* hostname */
 506                         if (is_host (optarg)) {
 507                                 server_address = optarg;
 508                         }
 509                         else {
 510                                 usage2 (_("Invalid hostname/address"), optarg);
 511                         }
 512                         break;
 513                 case 'p':                                                                       /* port */
 514                         if (is_intpos (optarg))
 515                                 server_port = atoi (optarg);
 516                         else
 517                                 usage4 (_("Port must be a positive integer"));
 518                         break;
 519                 case 'F':
 520                 /* localhostname */
 521                         localhostname = strdup(optarg);
 522                         break;
 523                 case 'f':                                                                       /* from argument */
 524                         from_arg = optarg;
 525                         smtp_use_dummycmd = 1;
 526                         break;
 527                 case 'A':
 528                         authtype = optarg;
 529                         use_ehlo = TRUE;
 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                                 command_size+=8;
 543                                 commands = realloc (commands, sizeof(char *) * command_size);
 544                                 if (commands == NULL)
 545                                         die (STATE_UNKNOWN,
 546                                              _("Could not realloc() units [%d]\n"), ncommands);
 547                         }
 548                         commands[ncommands] = (char *) malloc (sizeof(char) * 255);
 549                         strncpy (commands[ncommands], optarg, 255);
 550                         ncommands++;
 551                         break;
 552                 case 'R':                                                                       /* server responses */
 553                         if (nresponses >= response_size) {
 554                                 response_size += 8;
 555                                 responses = realloc (responses, sizeof(char *) * response_size);
 556                                 if (responses == NULL)
 557                                         die (STATE_UNKNOWN,
 558                                              _("Could not realloc() units [%d]\n"), nresponses);
 559                         }
 560                         responses[nresponses] = (char *) malloc (sizeof(char) * 255);
 561                         strncpy (responses[nresponses], optarg, 255);
 562                         nresponses++;
 563                         break;
 564                 case 'c':                                                                       /* critical time threshold */
 565                         if (is_intnonneg (optarg)) {
 566                                 critical_time = atoi (optarg);
 567                                 check_critical_time = TRUE;
 568                         }
 569                         else {
 570                                 usage4 (_("Critical time must be a positive integer"));
 571                         }
 572                         break;
 573                 case 'w':                                                                       /* warning time threshold */
 574                         if (is_intnonneg (optarg)) {
 575                                 warning_time = atoi (optarg);
 576                                 check_warning_time = TRUE;
 577                         }
 578                         else {
 579                                 usage4 (_("Warning time must be a positive integer"));
 580                         }
 581                         break;
 582                 case 'v':                                                                       /* verbose */
 583                         verbose++;
 584                         break;
 585                 case 'q':
 586                         ignore_send_quit_failure++;             /* ignore problem sending QUIT */
 587                         break;
 588                 case 't':                                                                       /* timeout */
 589                         if (is_intnonneg (optarg)) {
 590                                 socket_timeout = atoi (optarg);
 591                         }
 592                         else {
 593                                 usage4 (_("Timeout interval must be a positive integer"));
 594                         }
 595                         break;
 596                 case 'S':
 597                 /* starttls */
 598                         use_ssl = TRUE;
 599                         use_ehlo = TRUE;
 600                         break;
 601                 case 'D':
 602                 /* Check SSL cert validity */
 603 #ifdef USE_OPENSSL
 604                         if ((temp=strchr(optarg,','))!=NULL) {
 605                             *temp='\0';
 606                             if (!is_intnonneg (temp))
 607                                usage2 ("Invalid certificate expiration period", optarg);
 608                             days_till_exp_warn = atoi(optarg);
 609                             *temp=',';
 610                             temp++;
 611                             if (!is_intnonneg (temp))
 612                                 usage2 (_("Invalid certificate expiration period"), temp);
 613                             days_till_exp_crit = atoi (temp);
 614                         }
 615                         else {
 616                             days_till_exp_crit=0;
 617                             if (!is_intnonneg (optarg))
 618                                 usage2 ("Invalid certificate expiration period", optarg);
 619                             days_till_exp_warn = atoi (optarg);
 620                         }
 621                         check_cert = TRUE;
 622 #else
 623                         usage (_("SSL support not available - install OpenSSL and recompile"));
 624 #endif
 625                         break;
 626                 case '4':
 627                         address_family = AF_INET;
 628                         break;
 629                 case '6':
 630 #ifdef USE_IPV6
 631                         address_family = AF_INET6;
 632 #else
 633                         usage4 (_("IPv6 support not available"));
 634 #endif
 635                         break;
 636                 case 'V':                                                                       /* version */
 637                         print_revision (progname, NP_VERSION);
 638                         exit (STATE_OK);
 639                 case 'h':                                                                       /* help */
 640                         print_help ();
 641                         exit (STATE_OK);
 642                 case '?':                                                                       /* help */
 643                         usage5 ();
 644                 }
 645         }
 646
 647         c = optind;
 648         if (server_address == NULL) {
 649                 if (argv[c]) {
 650                         if (is_host (argv[c]))
 651                                 server_address = argv[c];
 652                         else
 653                                 usage2 (_("Invalid hostname/address"), argv[c]);
 654                 }
 655                 else {
 656                         asprintf (&server_address, "127.0.0.1");
 657                 }
 658         }
 659
 660         if (server_expect == NULL)
 661                 server_expect = strdup (SMTP_EXPECT);
 662
 663         if (mail_command == NULL)
 664                 mail_command = strdup("MAIL ");
 665
 666         if (from_arg==NULL)
 667                 from_arg = strdup(" ");
 668
 669         return validate_arguments ();
 670 }
 671
 672
 673
 674 int
 675 validate_arguments (void)
 676 {
 677         return OK;
 678 }
 679
 680
 681 void
 682 smtp_quit(void)
 683 {
 684         int bytes;
 685         int n;
 686
 687         n = my_send(SMTP_QUIT, strlen(SMTP_QUIT));
 688         if(n < 0) {
 689                 if(ignore_send_quit_failure) {
 690                         if(verbose) {
 691                                 printf(_("Connection closed by server before sending QUIT command\n"));
 692                         }
 693                         return;
 694                 }
 695                 die (STATE_UNKNOWN,
 696                         _("Connection closed by server before sending QUIT command\n"));
 697         }
 698
 699         if (verbose)
 700                 printf(_("sent %s\n"), "QUIT");
 701
 702         /* read the response but don't care about problems */
 703         bytes = recvlines(buffer, MAX_INPUT_BUFFER);
 704         if (verbose) {
 705                 if (bytes < 0)
 706                         printf(_("recv() failed after QUIT."));
 707                 else if (bytes == 0)
 708                         printf(_("Connection reset by peer."));
 709                 else {
 710                         buffer[bytes] = '\0';
 711                         printf(_("received %s\n"), buffer);
 712                 }
 713         }
 714 }
 715
 716
 717 /*
 718  * Receive one line, copy it into buf and nul-terminate it.  Returns the
 719  * number of bytes written to buf (excluding the '\0') or 0 on EOF or <0 on
 720  * error.
 721  *
 722  * TODO: Reading one byte at a time is very inefficient.  Replace this by a
 723  * function which buffers the data, move that to netutils.c and change
 724  * check_smtp and other plugins to use that.  Also, remove (\r)\n.
 725  */
 726 int
 727 recvline(char *buf, size_t bufsize)
 728 {
 729         int result;
 730         unsigned i;
 731
 732         for (i = result = 0; i < bufsize - 1; i++) {
 733                 if ((result = my_recv(&buf[i], 1)) != 1)
 734                         break;
 735                 if (buf[i] == '\n') {
 736                         buf[++i] = '\0';
 737                         return i;
 738                 }
 739         }
 740         return (result == 1 || i == 0) ? -2 : result;   /* -2 if out of space */
 741 }
 742
 743
 744 /*
 745  * Receive one or more lines, copy them into buf and nul-terminate it.  Returns
 746  * the number of bytes written to buf (excluding the '\0') or 0 on EOF or <0 on
 747  * error.  Works for all protocols which format multiline replies as follows:
 748  *
 749  * ``The format for multiline replies requires that every line, except the last,
 750  * begin with the reply code, followed immediately by a hyphen, `-' (also known
 751  * as minus), followed by text.  The last line will begin with the reply code,
 752  * followed immediately by <SP>, optionally some text, and <CRLF>.  As noted
 753  * above, servers SHOULD send the <SP> if subsequent text is not sent, but
 754  * clients MUST be prepared for it to be omitted.'' (RFC 2821, 4.2.1)
 755  *
 756  * TODO: Move this to netutils.c.  Also, remove \r and possibly the final \n.
 757  */
 758 int
 759 recvlines(char *buf, size_t bufsize)
 760 {
 761         int result, i;
 762
 763         for (i = 0; /* forever */; i += result)
 764                 if (!((result = recvline(buf + i, bufsize - i)) > 3 &&
 765                     isdigit((int)buf[i]) &&
 766                     isdigit((int)buf[i + 1]) &&
 767                     isdigit((int)buf[i + 2]) &&
 768                     buf[i + 3] == '-'))
 769                         break;
 770
 771         return (result <= 0) ? result : result + i;
 772 }
 773
 774
 775 int
 776 my_close (void)
 777 {
 778 #ifdef HAVE_SSL
 779   np_net_ssl_cleanup();
 780 #endif
 781   return close(sd);
 782 }
 783
 784
 785 void
 786 print_help (void)
 787 {
 788         char *myport;
 789         asprintf (&myport, "%d", SMTP_PORT);
 790
 791         print_revision (progname, NP_VERSION);
 792
 793         printf ("Copyright (c) 1999-2001 Ethan Galstad <nagios@nagios.org>\n");
 794         printf (COPYRIGHT, copyright, email);
 795
 796         printf("%s\n", _("This plugin will attempt to open an SMTP connection with the host."));
 797
 798   printf ("\n\n");
 799
 800         print_usage ();
 801
 802         printf (UT_HELP_VRSN);
 803         printf (UT_EXTRA_OPTS);
 804
 805         printf (UT_HOST_PORT, 'p', myport);
 806
 807         printf (UT_IPv46);
 808
 809         printf (" %s\n", "-e, --expect=STRING");
 810   printf (_("    String to expect in first line of server response (default: '%s')\n"), SMTP_EXPECT);
 811   printf (" %s\n", "-C, --command=STRING");
 812   printf ("    %s\n", _("SMTP command (may be used repeatedly)"));
 813   printf (" %s\n", "-R, --command=STRING");
 814   printf ("    %s\n", _("Expected response to command (may be used repeatedly)"));
 815   printf (" %s\n", "-f, --from=STRING");
 816   printf ("    %s\n", _("FROM-address to include in MAIL command, required by Exchange 2000")),
 817   printf (" %s\n", "-F, --fqdn=STRING");
 818   printf ("    %s\n", _("FQDN used for HELO"));
 819 #ifdef HAVE_SSL
 820   printf (" %s\n", "-D, --certificate=INTEGER[,INTEGER]");
 821   printf ("    %s\n", _("Minimum number of days a certificate has to be valid."));
 822   printf (" %s\n", "-S, --starttls");
 823   printf ("    %s\n", _("Use STARTTLS for the connection."));
 824 #endif
 825
 826         printf (" %s\n", "-A, --authtype=STRING");
 827   printf ("    %s\n", _("SMTP AUTH type to check (default none, only LOGIN supported)"));
 828   printf (" %s\n", "-U, --authuser=STRING");
 829   printf ("    %s\n", _("SMTP AUTH username"));
 830   printf (" %s\n", "-P, --authpass=STRING");
 831   printf ("    %s\n", _("SMTP AUTH password"));
 832   printf (" %s\n", "-q, --ignore-quit-failure");
 833   printf ("    %s\n", _("Ignore failure when sending QUIT command to server"));
 834
 835         printf (UT_WARN_CRIT);
 836
 837         printf (UT_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
 838
 839         printf (UT_VERBOSE);
 840
 841         printf("\n");
 842         printf ("%s\n", _("Successul connects return STATE_OK, refusals and timeouts return"));
 843   printf ("%s\n", _("STATE_CRITICAL, other errors return STATE_UNKNOWN.  Successful"));
 844   printf ("%s\n", _("connects, but incorrect reponse messages from the host result in"));
 845   printf ("%s\n", _("STATE_WARNING return values."));
 846
 847         printf (UT_SUPPORT);
 848 }
 849
 850
 851
 852 void
 853 print_usage (void)
 854 {
 855   printf ("%s\n", _("Usage:"));
 856   printf ("%s -H host [-p port] [-4|-6] [-e expect] [-C command] [-f from addr]", progname);
 857   printf ("[-A authtype -U authuser -P authpass] [-w warn] [-c crit] [-t timeout] [-q]\n");
 858   printf ("[-F fqdn] [-S] [-D warn days cert expire[,crit days cert expire]] [-v] \n");
 859 }
 860