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 * 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 * This program is free software: you can redistribute it and/or modify
  18 * it under the terms of the GNU General Public License as published by
  19 * the Free Software Foundation, either version 3 of the License, or
  20 * (at your option) any later version.
  21 *
  22 * This program is distributed in the hope that it will be useful,
  23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25 * GNU General Public License for more details.
  26 *
  27 * You should have received a copy of the GNU General Public License
  28 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  29 *
  30 * $Id$
  31 *
  32 *****************************************************************************/
  33
  34 const char *progname = "check_smtp";
  35 const char *revision = "$Revision$";
  36 const char *copyright = "2000-2007";
  37 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  38
  39 #include <ctype.h>
  40
  41 #include "common.h"
  42 #include "netutils.h"
  43 #include "utils.h"
  44 #include "base64.h"
  45
  46 #ifdef HAVE_SSL
  47 int check_cert = FALSE;
  48 int days_till_exp;
  49 #  define my_recv(buf, len) ((use_ssl && ssl_established) ? np_net_ssl_read(buf, len) : read(sd, buf, len))
  50 #  define my_send(buf, len) ((use_ssl && ssl_established) ? np_net_ssl_write(buf, len) : send(sd, buf, len, 0))
  51 #else /* ifndef HAVE_SSL */
  52 #  define my_recv(buf, len) read(sd, buf, len)
  53 #  define my_send(buf, len) send(sd, buf, len, 0)
  54 #endif
  55
  56 enum {
  57         SMTP_PORT       = 25
  58 };
  59 #define SMTP_EXPECT "220"
  60 #define SMTP_HELO "HELO "
  61 #define SMTP_EHLO "EHLO "
  62 #define SMTP_QUIT "QUIT\r\n"
  63 #define SMTP_STARTTLS "STARTTLS\r\n"
  64 #define SMTP_AUTH_LOGIN "AUTH LOGIN\r\n"
  65
  66 #ifndef HOST_MAX_BYTES
  67 #define HOST_MAX_BYTES 255
  68 #endif
  69
  70 #define EHLO_SUPPORTS_STARTTLS 1
  71
  72 int process_arguments (int, char **);
  73 int validate_arguments (void);
  74 void print_help (void);
  75 void print_usage (void);
  76 void smtp_quit(void);
  77 int recvline(char *, size_t);
  78 int recvlines(char *, size_t);
  79 int my_close(void);
  80
  81 #include "regex.h"
  82 char regex_expect[MAX_INPUT_BUFFER] = "";
  83 regex_t preg;
  84 regmatch_t pmatch[10];
  85 char timestamp[20] = "";
  86 char errbuf[MAX_INPUT_BUFFER];
  87 int cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
  88 int eflags = 0;
  89 int errcode, excode;
  90
  91 int server_port = SMTP_PORT;
  92 char *server_address = NULL;
  93 char *server_expect = NULL;
  94 int smtp_use_dummycmd = 0;
  95 char *mail_command = NULL;
  96 char *from_arg = NULL;
  97 int ncommands=0;
  98 int command_size=0;
  99 int nresponses=0;
 100 int response_size=0;
 101 char **commands = NULL;
 102 char **responses = NULL;
 103 char *authtype = NULL;
 104 char *authuser = NULL;
 105 char *authpass = NULL;
 106 int warning_time = 0;
 107 int check_warning_time = FALSE;
 108 int critical_time = 0;
 109 int check_critical_time = FALSE;
 110 int verbose = 0;
 111 int use_ssl = FALSE;
 112 short use_ehlo = FALSE;
 113 short ssl_established = 0;
 114 char *localhostname = NULL;
 115 int sd;
 116 char buffer[MAX_INPUT_BUFFER];
 117 enum {
 118   TCP_PROTOCOL = 1,
 119   UDP_PROTOCOL = 2,
 120 };
 121
 122
 123 int
 124 main (int argc, char **argv)
 125 {
 126         short supports_tls=FALSE;
 127         int n = 0;
 128         double elapsed_time;
 129         long microsec;
 130         int result = STATE_UNKNOWN;
 131         char *cmd_str = NULL;
 132         char *helocmd = NULL;
 133         char *error_msg = "";
 134         struct timeval tv;
 135
 136         setlocale (LC_ALL, "");
 137         bindtextdomain (PACKAGE, LOCALEDIR);
 138         textdomain (PACKAGE);
 139
 140         if (process_arguments (argc, argv) == ERROR)
 141                 usage4 (_("Could not parse arguments"));
 142
 143         /* If localhostname not set on command line, use gethostname to set */
 144         if(! localhostname){
 145                 localhostname = malloc (HOST_MAX_BYTES);
 146                 if(!localhostname){
 147                         printf(_("malloc() failed!\n"));
 148                         return STATE_CRITICAL;
 149                 }
 150                 if(gethostname(localhostname, HOST_MAX_BYTES)){
 151                         printf(_("gethostname() failed!\n"));
 152                         return STATE_CRITICAL;
 153                 }
 154         }
 155         if(use_ehlo)
 156                 asprintf (&helocmd, "%s%s%s", SMTP_EHLO, localhostname, "\r\n");
 157         else
 158                 asprintf (&helocmd, "%s%s%s", SMTP_HELO, localhostname, "\r\n");
 159
 160         if (verbose)
 161                 printf("HELOCMD: %s", helocmd);
 162
 163         /* initialize the MAIL command with optional FROM command  */
 164         asprintf (&cmd_str, "%sFROM: %s%s", mail_command, from_arg, "\r\n");
 165
 166         if (verbose && smtp_use_dummycmd)
 167                 printf ("FROM CMD: %s", cmd_str);
 168
 169         /* initialize alarm signal handling */
 170         (void) signal (SIGALRM, socket_timeout_alarm_handler);
 171
 172         /* set socket timeout */
 173         (void) alarm (socket_timeout);
 174
 175         /* start timer */
 176         gettimeofday (&tv, NULL);
 177
 178         /* try to connect to the host at the given port number */
 179         result = my_tcp_connect (server_address, server_port, &sd);
 180
 181         if (result == STATE_OK) { /* we connected */
 182
 183                 /* watch for the SMTP connection string and */
 184                 /* return a WARNING status if we couldn't read any data */
 185                 if (recvlines(buffer, MAX_INPUT_BUFFER) <= 0) {
 186                         printf (_("recv() failed\n"));
 187                         result = STATE_WARNING;
 188                 }
 189                 else {
 190                         if (verbose)
 191                                 printf ("%s", buffer);
 192                         /* strip the buffer of carriage returns */
 193                         strip (buffer);
 194                         /* make sure we find the response we are looking for */
 195                         if (!strstr (buffer, server_expect)) {
 196                                 if (server_port == SMTP_PORT)
 197                                         printf (_("Invalid SMTP response received from host\n"));
 198                                 else
 199                                         printf (_("Invalid SMTP response received from host on port %d\n"),
 200                                                                         server_port);
 201                                 result = STATE_WARNING;
 202                         }
 203                 }
 204
 205                 /* send the HELO/EHLO command */
 206                 send(sd, helocmd, strlen(helocmd), 0);
 207
 208                 /* allow for response to helo command to reach us */
 209                 if (recvlines(buffer, MAX_INPUT_BUFFER) <= 0) {
 210                         printf (_("recv() failed\n"));
 211                         return STATE_WARNING;
 212                 } else if(use_ehlo){
 213                         if(strstr(buffer, "250 STARTTLS") != NULL ||
 214                            strstr(buffer, "250-STARTTLS") != NULL){
 215                                 supports_tls=TRUE;
 216                         }
 217                 }
 218
 219                 if(use_ssl && ! supports_tls){
 220                         printf(_("WARNING - TLS not supported by server\n"));
 221                         smtp_quit();
 222                         return STATE_WARNING;
 223                 }
 224
 225 #ifdef HAVE_SSL
 226                 if(use_ssl) {
 227                   /* send the STARTTLS command */
 228                   send(sd, SMTP_STARTTLS, strlen(SMTP_STARTTLS), 0);
 229
 230                   recvlines(buffer, MAX_INPUT_BUFFER); /* wait for it */
 231                   if (!strstr (buffer, server_expect)) {
 232                     printf (_("Server does not support STARTTLS\n"));
 233                     smtp_quit();
 234                     return STATE_UNKNOWN;
 235                   }
 236                   result = np_net_ssl_init(sd);
 237                   if(result != STATE_OK) {
 238                     printf (_("CRITICAL - Cannot create SSL context.\n"));
 239                     np_net_ssl_cleanup();
 240                     close(sd);
 241                     return STATE_CRITICAL;
 242                   } else {
 243                         ssl_established = 1;
 244                   }
 245
 246                 /*
 247                  * Resend the EHLO command.
 248                  *
 249                  * RFC 3207 (4.2) says: ``The client MUST discard any knowledge
 250                  * obtained from the server, such as the list of SMTP service
 251                  * extensions, which was not obtained from the TLS negotiation
 252                  * itself.  The client SHOULD send an EHLO command as the first
 253                  * command after a successful TLS negotiation.''  For this
 254                  * reason, some MTAs will not allow an AUTH LOGIN command before
 255                  * we resent EHLO via TLS.
 256                  */
 257                 if (my_send(helocmd, strlen(helocmd)) <= 0) {
 258                         printf("%s\n", _("SMTP UNKNOWN - Cannot send EHLO command via TLS."));
 259                         my_close();
 260                         return STATE_UNKNOWN;
 261                 }
 262                 if (verbose)
 263                         printf(_("sent %s"), helocmd);
 264                 if ((n = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
 265                         printf("%s\n", _("SMTP UNKNOWN - Cannot read EHLO response via TLS."));
 266                         my_close();
 267                         return STATE_UNKNOWN;
 268                 }
 269                 if (verbose) {
 270                         printf("%s", buffer);
 271                 }
 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 ("%s\n", _("CRITICAL - Cannot retrieve server certificate."));
 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                   if (recvlines(buffer, MAX_INPUT_BUFFER) >= 1 && verbose)
 299                     printf("%s", buffer);
 300                 }
 301
 302                 while (n < ncommands) {
 303                         asprintf (&cmd_str, "%s%s", commands[n], "\r\n");
 304                         my_send(cmd_str, strlen(cmd_str));
 305                         if (recvlines(buffer, MAX_INPUT_BUFFER) >= 1 && verbose)
 306                                 printf("%s", buffer);
 307                         strip (buffer);
 308                         if (n < nresponses) {
 309                                 cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
 310                                 errcode = regcomp (&preg, responses[n], cflags);
 311                                 if (errcode != 0) {
 312                                         regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
 313                                         printf (_("Could Not Compile Regular Expression"));
 314                                         return ERROR;
 315                                 }
 316                                 excode = regexec (&preg, buffer, 10, pmatch, eflags);
 317                                 if (excode == 0) {
 318                                         result = STATE_OK;
 319                                 }
 320                                 else if (excode == REG_NOMATCH) {
 321                                         result = STATE_WARNING;
 322                                         printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]);
 323                                 }
 324                                 else {
 325                                         regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER);
 326                                         printf (_("Execute Error: %s\n"), errbuf);
 327                                         result = STATE_UNKNOWN;
 328                                 }
 329                         }
 330                         n++;
 331                 }
 332
 333                 if (authtype != NULL) {
 334                         if (strcmp (authtype, "LOGIN") == 0) {
 335                                 char *abuf;
 336                                 int ret;
 337                                 do {
 338                                         if (authuser == NULL) {
 339                                                 result = STATE_CRITICAL;
 340                                                 asprintf(&error_msg, _("no authuser specified, "));
 341                                                 break;
 342                                         }
 343                                         if (authpass == NULL) {
 344                                                 result = STATE_CRITICAL;
 345                                                 asprintf(&error_msg, _("no authpass specified, "));
 346                                                 break;
 347                                         }
 348
 349                                         /* send AUTH LOGIN */
 350                                         my_send(SMTP_AUTH_LOGIN, strlen(SMTP_AUTH_LOGIN));
 351                                         if (verbose)
 352                                                 printf (_("sent %s\n"), "AUTH LOGIN");
 353
 354                                         if ((ret = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
 355                                                 asprintf(&error_msg, _("recv() failed after AUTH LOGIN, "));
 356                                                 result = STATE_WARNING;
 357                                                 break;
 358                                         }
 359                                         if (verbose)
 360                                                 printf (_("received %s\n"), buffer);
 361
 362                                         if (strncmp (buffer, "334", 3) != 0) {
 363                                                 result = STATE_CRITICAL;
 364                                                 asprintf(&error_msg, _("invalid response received after AUTH LOGIN, "));
 365                                                 break;
 366                                         }
 367
 368                                         /* encode authuser with base64 */
 369                                         base64_encode_alloc (authuser, strlen(authuser), &abuf);
 370                                         /* FIXME: abuf shouldn't have enough space to strcat a '\r\n' into it. */
 371                                         strcat (abuf, "\r\n");
 372                                         my_send(abuf, strlen(abuf));
 373                                         if (verbose)
 374                                                 printf (_("sent %s\n"), abuf);
 375
 376                                         if ((ret = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
 377                                                 result = STATE_CRITICAL;
 378                                                 asprintf(&error_msg, _("recv() failed after sending authuser, "));
 379                                                 break;
 380                                         }
 381                                         if (verbose) {
 382                                                 printf (_("received %s\n"), buffer);
 383                                         }
 384                                         if (strncmp (buffer, "334", 3) != 0) {
 385                                                 result = STATE_CRITICAL;
 386                                                 asprintf(&error_msg, _("invalid response received after authuser, "));
 387                                                 break;
 388                                         }
 389                                         /* encode authpass with base64 */
 390                                         base64_encode_alloc (authpass, strlen(authpass), &abuf);
 391                                         /* FIXME: abuf shouldn't have enough space to strcat a '\r\n' into it. */
 392                                         strcat (abuf, "\r\n");
 393                                         my_send(abuf, strlen(abuf));
 394                                         if (verbose) {
 395                                                 printf (_("sent %s\n"), abuf);
 396                                         }
 397                                         if ((ret = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
 398                                                 result = STATE_CRITICAL;
 399                                                 asprintf(&error_msg, _("recv() failed after sending authpass, "));
 400                                                 break;
 401                                         }
 402                                         if (verbose) {
 403                                                 printf (_("received %s\n"), buffer);
 404                                         }
 405                                         if (strncmp (buffer, "235", 3) != 0) {
 406                                                 result = STATE_CRITICAL;
 407                                                 asprintf(&error_msg, _("invalid response received after authpass, "));
 408                                                 break;
 409                                         }
 410                                         break;
 411                                 } while (0);
 412                         } else {
 413                                 result = STATE_CRITICAL;
 414                                 asprintf(&error_msg, _("only authtype LOGIN is supported, "));
 415                         }
 416                 }
 417
 418                 /* tell the server we're done */
 419                 smtp_quit();
 420
 421                 /* finally close the connection */
 422                 close (sd);
 423         }
 424
 425         /* reset the alarm */
 426         alarm (0);
 427
 428         microsec = deltime (tv);
 429         elapsed_time = (double)microsec / 1.0e6;
 430
 431         if (result == STATE_OK) {
 432                 if (check_critical_time && elapsed_time > (double) critical_time)
 433                         result = STATE_CRITICAL;
 434                 else if (check_warning_time && elapsed_time > (double) warning_time)
 435                         result = STATE_WARNING;
 436         }
 437
 438         printf (_("SMTP %s - %s%.3f sec. response time%s%s|%s\n"),
 439                         state_text (result),
 440                         error_msg,
 441                         elapsed_time,
 442                         verbose?", ":"", verbose?buffer:"",
 443                         fperfdata ("time", elapsed_time, "s",
 444                                 (int)check_warning_time, warning_time,
 445                                 (int)check_critical_time, critical_time,
 446                                 TRUE, 0, FALSE, 0));
 447
 448         return result;
 449 }
 450
 451
 452
 453 /* process command-line arguments */
 454 int
 455 process_arguments (int argc, char **argv)
 456 {
 457         int c;
 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                 {"nocommand", required_argument, 0, 'n'},
 475                 {"verbose", no_argument, 0, 'v'},
 476                 {"version", no_argument, 0, 'V'},
 477                 {"use-ipv4", no_argument, 0, '4'},
 478                 {"use-ipv6", no_argument, 0, '6'},
 479                 {"help", no_argument, 0, 'h'},
 480                 {"starttls",no_argument,0,'S'},
 481                 {"certificate",required_argument,0,'D'},
 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:",
 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 't':                                                                       /* timeout */
 586                         if (is_intnonneg (optarg)) {
 587                                 socket_timeout = atoi (optarg);
 588                         }
 589                         else {
 590                                 usage4 (_("Timeout interval must be a positive integer"));
 591                         }
 592                         break;
 593                 case 'S':
 594                 /* starttls */
 595                         use_ssl = TRUE;
 596                         use_ehlo = TRUE;
 597                         break;
 598                 case 'D':
 599                 /* Check SSL cert validity */
 600 #ifdef USE_OPENSSL
 601                         if (!is_intnonneg (optarg))
 602                                 usage2 ("Invalid certificate expiration period",optarg);
 603                                 days_till_exp = atoi (optarg);
 604                                 check_cert = TRUE;
 605 #else
 606                                 usage (_("SSL support not available - install OpenSSL and recompile"));
 607 #endif
 608                         break;
 609                 case '4':
 610                         address_family = AF_INET;
 611                         break;
 612                 case '6':
 613 #ifdef USE_IPV6
 614                         address_family = AF_INET6;
 615 #else
 616                         usage4 (_("IPv6 support not available"));
 617 #endif
 618                         break;
 619                 case 'V':                                                                       /* version */
 620                         print_revision (progname, revision);
 621                         exit (STATE_OK);
 622                 case 'h':                                                                       /* help */
 623                         print_help ();
 624                         exit (STATE_OK);
 625                 case '?':                                                                       /* help */
 626                         usage5 ();
 627                 }
 628         }
 629
 630         c = optind;
 631         if (server_address == NULL) {
 632                 if (argv[c]) {
 633                         if (is_host (argv[c]))
 634                                 server_address = argv[c];
 635                         else
 636                                 usage2 (_("Invalid hostname/address"), argv[c]);
 637                 }
 638                 else {
 639                         asprintf (&server_address, "127.0.0.1");
 640                 }
 641         }
 642
 643         if (server_expect == NULL)
 644                 server_expect = strdup (SMTP_EXPECT);
 645
 646         if (mail_command == NULL)
 647                 mail_command = strdup("MAIL ");
 648
 649         if (from_arg==NULL)
 650                 from_arg = strdup(" ");
 651
 652         return validate_arguments ();
 653 }
 654
 655
 656
 657 int
 658 validate_arguments (void)
 659 {
 660         return OK;
 661 }
 662
 663
 664 void
 665 smtp_quit(void)
 666 {
 667         int bytes;
 668
 669         my_send(SMTP_QUIT, strlen(SMTP_QUIT));
 670         if (verbose)
 671                 printf(_("sent %s\n"), "QUIT");
 672
 673         /* read the response but don't care about problems */
 674         bytes = recvlines(buffer, MAX_INPUT_BUFFER);
 675         if (verbose) {
 676                 if (bytes < 0)
 677                         printf(_("recv() failed after QUIT."));
 678                 else if (bytes == 0)
 679                         printf(_("Connection reset by peer."));
 680                 else {
 681                         buffer[bytes] = '\0';
 682                         printf(_("received %s\n"), buffer);
 683                 }
 684         }
 685 }
 686
 687
 688 /*
 689  * Receive one line, copy it into buf and nul-terminate it.  Returns the
 690  * number of bytes written to buf (excluding the '\0') or 0 on EOF or <0 on
 691  * error.
 692  *
 693  * TODO: Reading one byte at a time is very inefficient.  Replace this by a
 694  * function which buffers the data, move that to netutils.c and change
 695  * check_smtp and other plugins to use that.  Also, remove (\r)\n.
 696  */
 697 int
 698 recvline(char *buf, size_t bufsize)
 699 {
 700         int result;
 701         unsigned i;
 702
 703         for (i = result = 0; i < bufsize - 1; i++) {
 704                 if ((result = my_recv(&buf[i], 1)) != 1)
 705                         break;
 706                 if (buf[i] == '\n') {
 707                         buf[++i] = '\0';
 708                         return i;
 709                 }
 710         }
 711         return (result == 1 || i == 0) ? -2 : result;   /* -2 if out of space */
 712 }
 713
 714
 715 /*
 716  * Receive one or more lines, copy them into buf and nul-terminate it.  Returns
 717  * the number of bytes written to buf (excluding the '\0') or 0 on EOF or <0 on
 718  * error.  Works for all protocols which format multiline replies as follows:
 719  *
 720  * ``The format for multiline replies requires that every line, except the last,
 721  * begin with the reply code, followed immediately by a hyphen, `-' (also known
 722  * as minus), followed by text.  The last line will begin with the reply code,
 723  * followed immediately by <SP>, optionally some text, and <CRLF>.  As noted
 724  * above, servers SHOULD send the <SP> if subsequent text is not sent, but
 725  * clients MUST be prepared for it to be omitted.'' (RFC 2821, 4.2.1)
 726  *
 727  * TODO: Move this to netutils.c.  Also, remove \r and possibly the final \n.
 728  */
 729 int
 730 recvlines(char *buf, size_t bufsize)
 731 {
 732         int result, i;
 733
 734         for (i = 0; /* forever */; i += result)
 735                 if (!((result = recvline(buf + i, bufsize - i)) > 3 &&
 736                     isdigit((int)buf[i]) &&
 737                     isdigit((int)buf[i + 1]) &&
 738                     isdigit((int)buf[i + 2]) &&
 739                     buf[i + 3] == '-'))
 740                         break;
 741
 742         return (result <= 0) ? result : result + i;
 743 }
 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 }
 754
 755
 756 void
 757 print_help (void)
 758 {
 759         char *myport;
 760         asprintf (&myport, "%d", SMTP_PORT);
 761
 762         print_revision (progname, revision);
 763
 764         printf ("Copyright (c) 1999-2001 Ethan Galstad <nagios@nagios.org>\n");
 765         printf (COPYRIGHT, copyright, email);
 766
 767         printf("%s\n", _("This plugin will attempt to open an SMTP connection with the host."));
 768
 769   printf ("\n\n");
 770
 771         print_usage ();
 772
 773         printf (_(UT_HELP_VRSN));
 774
 775         printf (_(UT_HOST_PORT), 'p', myport);
 776
 777         printf (_(UT_IPv46));
 778
 779         printf (" %s\n", "-e, --expect=STRING");
 780   printf (_("    String to expect in first line of server response (default: '%s')\n"), SMTP_EXPECT);
 781   printf (" %s\n", "-n, nocommand");
 782   printf ("    %s\n", _("Suppress SMTP command"));
 783   printf (" %s\n", "-C, --command=STRING");
 784   printf ("    %s\n", _("SMTP command (may be used repeatedly)"));
 785   printf (" %s\n", "-R, --command=STRING");
 786   printf ("    %s\n", _("Expected response to command (may be used repeatedly)"));
 787   printf (" %s\n", "-f, --from=STRING");
 788   printf ("    %s\n", _("FROM-address to include in MAIL command, required by Exchange 2000")),
 789 #ifdef HAVE_SSL
 790   printf (" %s\n", "-D, --certificate=INTEGER");
 791   printf ("    %s\n", _("Minimum number of days a certificate has to be valid."));
 792   printf (" %s\n", "-S, --starttls");
 793   printf ("    %s\n", _("Use STARTTLS for the connection."));
 794 #endif
 795
 796         printf (" %s\n", "-A, --authtype=STRING");
 797   printf ("    %s\n", _("SMTP AUTH type to check (default none, only LOGIN supported)"));
 798   printf (" %s\n", "-U, --authuser=STRING");
 799   printf ("    %s\n", _("SMTP AUTH username"));
 800   printf (" %s\n", "-P, --authpass=STRING");
 801   printf ("    %s\n", _("SMTP AUTH password"));
 802
 803         printf (_(UT_WARN_CRIT));
 804
 805         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 806
 807         printf (_(UT_VERBOSE));
 808
 809         printf("\n");
 810         printf ("%s\n", _("Successul connects return STATE_OK, refusals and timeouts return"));
 811   printf ("%s\n", _("STATE_CRITICAL, other errors return STATE_UNKNOWN.  Successful"));
 812   printf ("%s\n", _("connects, but incorrect reponse messages from the host result in"));
 813   printf ("%s\n", _("STATE_WARNING return values."));
 814
 815         printf (_(UT_SUPPORT));
 816 }
 817
 818
 819
 820 void
 821 print_usage (void)
 822 {
 823   printf (_("Usage:"));
 824         printf ("%s -H host [-p port] [-e expect] [-C command] [-f from addr]", progname);
 825   printf ("[-A authtype -U authuser -P authpass] [-w warn] [-c crit] [-t timeout]\n");
 826   printf ("[-S] [-D days] [-n] [-v] [-4|-6]\n");
 827 }
 828