plugins/check_smtp.c

   1 /*****************************************************************************
   2 *
   3 * Monitoring check_smtp plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 2000-2007 Monitoring 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 = "devel@monitoring-plugins.org";
  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 char *mail_command = NULL;
  91 char *from_arg = NULL;
  92 int send_mail_from=0;
  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 double warning_time = 0;
 103 int check_warning_time = FALSE;
 104 double 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         char *server_response = NULL;
 132         struct timeval tv;
 133
 134         /* Catch pipe errors in read/write - sometimes occurs when writing QUIT */
 135         (void) signal (SIGPIPE, SIG_IGN);
 136
 137         setlocale (LC_ALL, "");
 138         bindtextdomain (PACKAGE, LOCALEDIR);
 139         textdomain (PACKAGE);
 140
 141         /* Parse extra opts if any */
 142         argv=np_extra_opts (&argc, argv, progname);
 143
 144         if (process_arguments (argc, argv) == ERROR)
 145                 usage4 (_("Could not parse arguments"));
 146
 147         /* If localhostname not set on command line, use gethostname to set */
 148         if(! localhostname){
 149                 localhostname = malloc (HOST_MAX_BYTES);
 150                 if(!localhostname){
 151                         printf(_("malloc() failed!\n"));
 152                         return STATE_CRITICAL;
 153                 }
 154                 if(gethostname(localhostname, HOST_MAX_BYTES)){
 155                         printf(_("gethostname() failed!\n"));
 156                         return STATE_CRITICAL;
 157                 }
 158         }
 159         if(use_ehlo)
 160                 xasprintf (&helocmd, "%s%s%s", SMTP_EHLO, localhostname, "\r\n");
 161         else
 162                 xasprintf (&helocmd, "%s%s%s", SMTP_HELO, localhostname, "\r\n");
 163
 164         if (verbose)
 165                 printf("HELOCMD: %s", helocmd);
 166
 167         /* initialize the MAIL command with optional FROM command  */
 168         xasprintf (&cmd_str, "%sFROM:<%s>%s", mail_command, from_arg, "\r\n");
 169
 170         if (verbose && send_mail_from)
 171                 printf ("FROM CMD: %s", cmd_str);
 172
 173         /* initialize alarm signal handling */
 174         (void) signal (SIGALRM, socket_timeout_alarm_handler);
 175
 176         /* set socket timeout */
 177         (void) alarm (socket_timeout);
 178
 179         /* start timer */
 180         gettimeofday (&tv, NULL);
 181
 182         /* try to connect to the host at the given port number */
 183         result = my_tcp_connect (server_address, server_port, &sd);
 184
 185         if (result == STATE_OK) { /* we connected */
 186
 187                 /* watch for the SMTP connection string and */
 188                 /* return a WARNING status if we couldn't read any data */
 189                 if (recvlines(buffer, MAX_INPUT_BUFFER) <= 0) {
 190                         printf (_("recv() failed\n"));
 191                         return STATE_WARNING;
 192                 }
 193
 194                 /* save connect return (220 hostname ..) for later use */
 195                 xasprintf(&server_response, "%s", buffer);
 196
 197                 /* send the HELO/EHLO command */
 198                 send(sd, helocmd, strlen(helocmd), 0);
 199
 200                 /* allow for response to helo command to reach us */
 201                 if (recvlines(buffer, MAX_INPUT_BUFFER) <= 0) {
 202                         printf (_("recv() failed\n"));
 203                         return STATE_WARNING;
 204                 } else if(use_ehlo){
 205                         if(strstr(buffer, "250 STARTTLS") != NULL ||
 206                            strstr(buffer, "250-STARTTLS") != NULL){
 207                                 supports_tls=TRUE;
 208                         }
 209                 }
 210
 211                 if(use_ssl && ! supports_tls){
 212                         printf(_("WARNING - TLS not supported by server\n"));
 213                         smtp_quit();
 214                         return STATE_WARNING;
 215                 }
 216
 217 #ifdef HAVE_SSL
 218                 if(use_ssl) {
 219                   /* send the STARTTLS command */
 220                   send(sd, SMTP_STARTTLS, strlen(SMTP_STARTTLS), 0);
 221
 222                   recvlines(buffer, MAX_INPUT_BUFFER); /* wait for it */
 223                   if (!strstr (buffer, SMTP_EXPECT)) {
 224                     printf (_("Server does not support STARTTLS\n"));
 225                     smtp_quit();
 226                     return STATE_UNKNOWN;
 227                   }
 228                   result = np_net_ssl_init(sd);
 229                   if(result != STATE_OK) {
 230                     printf (_("CRITICAL - Cannot create SSL context.\n"));
 231                     np_net_ssl_cleanup();
 232                     close(sd);
 233                     return STATE_CRITICAL;
 234                   } else {
 235                         ssl_established = 1;
 236                   }
 237
 238                 /*
 239                  * Resend the EHLO command.
 240                  *
 241                  * RFC 3207 (4.2) says: ``The client MUST discard any knowledge
 242                  * obtained from the server, such as the list of SMTP service
 243                  * extensions, which was not obtained from the TLS negotiation
 244                  * itself.  The client SHOULD send an EHLO command as the first
 245                  * command after a successful TLS negotiation.''  For this
 246                  * reason, some MTAs will not allow an AUTH LOGIN command before
 247                  * we resent EHLO via TLS.
 248                  */
 249                 if (my_send(helocmd, strlen(helocmd)) <= 0) {
 250                         printf("%s\n", _("SMTP UNKNOWN - Cannot send EHLO command via TLS."));
 251                         my_close();
 252                         return STATE_UNKNOWN;
 253                 }
 254                 if (verbose)
 255                         printf(_("sent %s"), helocmd);
 256                 if ((n = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
 257                         printf("%s\n", _("SMTP UNKNOWN - Cannot read EHLO response via TLS."));
 258                         my_close();
 259                         return STATE_UNKNOWN;
 260                 }
 261                 if (verbose) {
 262                         printf("%s", buffer);
 263                 }
 264
 265 #  ifdef USE_OPENSSL
 266                   if ( check_cert ) {
 267                     result = np_net_ssl_check_cert(days_till_exp_warn, days_till_exp_crit);
 268                     smtp_quit();
 269                     my_close();
 270                     return result;
 271                   }
 272 #  endif /* USE_OPENSSL */
 273                 }
 274 #endif
 275
 276                 if (verbose)
 277                         printf ("%s", buffer);
 278
 279                 /* save buffer for later use */
 280                 xasprintf(&server_response, "%s%s", server_response, buffer);
 281                 /* strip the buffer of carriage returns */
 282                 strip (server_response);
 283
 284                 /* make sure we find the droids we are looking for */
 285                 if (!strstr (server_response, server_expect)) {
 286                         if (server_port == SMTP_PORT)
 287                                 printf (_("Invalid SMTP response received from host: %s\n"), server_response);
 288                         else
 289                                 printf (_("Invalid SMTP response received from host on port %d: %s\n"),
 290                                                                                 server_port, server_response);
 291                         return STATE_WARNING;
 292                 }
 293
 294                 if (send_mail_from) {
 295                   my_send(cmd_str, strlen(cmd_str));
 296                   if (recvlines(buffer, MAX_INPUT_BUFFER) >= 1 && verbose)
 297                     printf("%s", buffer);
 298                 }
 299
 300                 while (n < ncommands) {
 301                         xasprintf (&cmd_str, "%s%s", commands[n], "\r\n");
 302                         my_send(cmd_str, strlen(cmd_str));
 303                         if (recvlines(buffer, MAX_INPUT_BUFFER) >= 1 && verbose)
 304                                 printf("%s", buffer);
 305                         strip (buffer);
 306                         if (n < nresponses) {
 307                                 cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
 308                                 errcode = regcomp (&preg, responses[n], cflags);
 309                                 if (errcode != 0) {
 310                                         regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
 311                                         printf (_("Could Not Compile Regular Expression"));
 312                                         return ERROR;
 313                                 }
 314                                 excode = regexec (&preg, buffer, 10, pmatch, eflags);
 315                                 if (excode == 0) {
 316                                         result = STATE_OK;
 317                                 }
 318                                 else if (excode == REG_NOMATCH) {
 319                                         result = STATE_WARNING;
 320                                         printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]);
 321                                 }
 322                                 else {
 323                                         regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER);
 324                                         printf (_("Execute Error: %s\n"), errbuf);
 325                                         result = STATE_UNKNOWN;
 326                                 }
 327                         }
 328                         n++;
 329                 }
 330
 331                 if (authtype != NULL) {
 332                         if (strcmp (authtype, "LOGIN") == 0) {
 333                                 char *abuf;
 334                                 int ret;
 335                                 do {
 336                                         if (authuser == NULL) {
 337                                                 result = STATE_CRITICAL;
 338                                                 xasprintf(&error_msg, _("no authuser specified, "));
 339                                                 break;
 340                                         }
 341                                         if (authpass == NULL) {
 342                                                 result = STATE_CRITICAL;
 343                                                 xasprintf(&error_msg, _("no authpass specified, "));
 344                                                 break;
 345                                         }
 346
 347                                         /* send AUTH LOGIN */
 348                                         my_send(SMTP_AUTH_LOGIN, strlen(SMTP_AUTH_LOGIN));
 349                                         if (verbose)
 350                                                 printf (_("sent %s\n"), "AUTH LOGIN");
 351
 352                                         if ((ret = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
 353                                                 xasprintf(&error_msg, _("recv() failed after AUTH LOGIN, "));
 354                                                 result = STATE_WARNING;
 355                                                 break;
 356                                         }
 357                                         if (verbose)
 358                                                 printf (_("received %s\n"), buffer);
 359
 360                                         if (strncmp (buffer, "334", 3) != 0) {
 361                                                 result = STATE_CRITICAL;
 362                                                 xasprintf(&error_msg, _("invalid response received after AUTH LOGIN, "));
 363                                                 break;
 364                                         }
 365
 366                                         /* encode authuser with base64 */
 367                                         base64_encode_alloc (authuser, strlen(authuser), &abuf);
 368                                         xasprintf(&abuf, "%s\r\n", abuf);
 369                                         my_send(abuf, strlen(abuf));
 370                                         if (verbose)
 371                                                 printf (_("sent %s\n"), abuf);
 372
 373                                         if ((ret = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
 374                                                 result = STATE_CRITICAL;
 375                                                 xasprintf(&error_msg, _("recv() failed after sending authuser, "));
 376                                                 break;
 377                                         }
 378                                         if (verbose) {
 379                                                 printf (_("received %s\n"), buffer);
 380                                         }
 381                                         if (strncmp (buffer, "334", 3) != 0) {
 382                                                 result = STATE_CRITICAL;
 383                                                 xasprintf(&error_msg, _("invalid response received after authuser, "));
 384                                                 break;
 385                                         }
 386                                         /* encode authpass with base64 */
 387                                         base64_encode_alloc (authpass, strlen(authpass), &abuf);
 388                                         xasprintf(&abuf, "%s\r\n", abuf);
 389                                         my_send(abuf, strlen(abuf));
 390                                         if (verbose) {
 391                                                 printf (_("sent %s\n"), abuf);
 392                                         }
 393                                         if ((ret = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
 394                                                 result = STATE_CRITICAL;
 395                                                 xasprintf(&error_msg, _("recv() failed after sending authpass, "));
 396                                                 break;
 397                                         }
 398                                         if (verbose) {
 399                                                 printf (_("received %s\n"), buffer);
 400                                         }
 401                                         if (strncmp (buffer, "235", 3) != 0) {
 402                                                 result = STATE_CRITICAL;
 403                                                 xasprintf(&error_msg, _("invalid response received after authpass, "));
 404                                                 break;
 405                                         }
 406                                         break;
 407                                 } while (0);
 408                         } else {
 409                                 result = STATE_CRITICAL;
 410                                 xasprintf(&error_msg, _("only authtype LOGIN is supported, "));
 411                         }
 412                 }
 413
 414                 /* tell the server we're done */
 415                 smtp_quit();
 416
 417                 /* finally close the connection */
 418                 close (sd);
 419         }
 420
 421         /* reset the alarm */
 422         alarm (0);
 423
 424         microsec = deltime (tv);
 425         elapsed_time = (double)microsec / 1.0e6;
 426
 427         if (result == STATE_OK) {
 428                 if (check_critical_time && elapsed_time > critical_time)
 429                         result = STATE_CRITICAL;
 430                 else if (check_warning_time && elapsed_time > warning_time)
 431                         result = STATE_WARNING;
 432         }
 433
 434         printf (_("SMTP %s - %s%.3f sec. response time%s%s|%s\n"),
 435                         state_text (result),
 436                         error_msg,
 437                         elapsed_time,
 438                         verbose?", ":"", verbose?buffer:"",
 439                         fperfdata ("time", elapsed_time, "s",
 440                                 (int)check_warning_time, warning_time,
 441                                 (int)check_critical_time, critical_time,
 442                                 TRUE, 0, FALSE, 0));
 443
 444         return result;
 445 }
 446
 447
 448
 449 /* process command-line arguments */
 450 int
 451 process_arguments (int argc, char **argv)
 452 {
 453         int c;
 454         char* temp;
 455
 456         int option = 0;
 457         static struct option longopts[] = {
 458                 {"hostname", required_argument, 0, 'H'},
 459                 {"expect", required_argument, 0, 'e'},
 460                 {"critical", required_argument, 0, 'c'},
 461                 {"warning", required_argument, 0, 'w'},
 462                 {"timeout", required_argument, 0, 't'},
 463                 {"port", required_argument, 0, 'p'},
 464                 {"from", required_argument, 0, 'f'},
 465                 {"fqdn", required_argument, 0, 'F'},
 466                 {"authtype", required_argument, 0, 'A'},
 467                 {"authuser", required_argument, 0, 'U'},
 468                 {"authpass", required_argument, 0, 'P'},
 469                 {"command", required_argument, 0, 'C'},
 470                 {"response", required_argument, 0, 'R'},
 471                 {"verbose", no_argument, 0, 'v'},
 472                 {"version", no_argument, 0, 'V'},
 473                 {"use-ipv4", no_argument, 0, '4'},
 474                 {"use-ipv6", no_argument, 0, '6'},
 475                 {"help", no_argument, 0, 'h'},
 476                 {"starttls",no_argument,0,'S'},
 477                 {"certificate",required_argument,0,'D'},
 478                 {"ignore-quit-failure",no_argument,0,'q'},
 479                 {0, 0, 0, 0}
 480         };
 481
 482         if (argc < 2)
 483                 return ERROR;
 484
 485         for (c = 1; c < argc; c++) {
 486                 if (strcmp ("-to", argv[c]) == 0)
 487                         strcpy (argv[c], "-t");
 488                 else if (strcmp ("-wt", argv[c]) == 0)
 489                         strcpy (argv[c], "-w");
 490                 else if (strcmp ("-ct", argv[c]) == 0)
 491                         strcpy (argv[c], "-c");
 492         }
 493
 494         while (1) {
 495                 c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:R:SD:F:A:U:P:q",
 496                                  longopts, &option);
 497
 498                 if (c == -1 || c == EOF)
 499                         break;
 500
 501                 switch (c) {
 502                 case 'H':                                                                       /* hostname */
 503                         if (is_host (optarg)) {
 504                                 server_address = optarg;
 505                         }
 506                         else {
 507                                 usage2 (_("Invalid hostname/address"), optarg);
 508                         }
 509                         break;
 510                 case 'p':                                                                       /* port */
 511                         if (is_intpos (optarg))
 512                                 server_port = atoi (optarg);
 513                         else
 514                                 usage4 (_("Port must be a positive integer"));
 515                         break;
 516                 case 'F':
 517                 /* localhostname */
 518                         localhostname = strdup(optarg);
 519                         break;
 520                 case 'f':                                                                       /* from argument */
 521                         from_arg = optarg + strspn(optarg, "<");
 522                         from_arg = strndup(from_arg, strcspn(from_arg, ">"));
 523                         send_mail_from = 1;
 524                         break;
 525                 case 'A':
 526                         authtype = optarg;
 527                         use_ehlo = TRUE;
 528                         break;
 529                 case 'U':
 530                         authuser = optarg;
 531                         break;
 532                 case 'P':
 533                         authpass = optarg;
 534                         break;
 535                 case 'e':                                                                       /* server expect string on 220  */
 536                         server_expect = optarg;
 537                         break;
 538                 case 'C':                                                                       /* commands  */
 539                         if (ncommands >= command_size) {
 540                                 command_size+=8;
 541                                 commands = realloc (commands, sizeof(char *) * command_size);
 542                                 if (commands == NULL)
 543                                         die (STATE_UNKNOWN,
 544                                              _("Could not realloc() units [%d]\n"), ncommands);
 545                         }
 546                         commands[ncommands] = (char *) malloc (sizeof(char) * 255);
 547                         strncpy (commands[ncommands], optarg, 255);
 548                         ncommands++;
 549                         break;
 550                 case 'R':                                                                       /* server responses */
 551                         if (nresponses >= response_size) {
 552                                 response_size += 8;
 553                                 responses = realloc (responses, sizeof(char *) * response_size);
 554                                 if (responses == NULL)
 555                                         die (STATE_UNKNOWN,
 556                                              _("Could not realloc() units [%d]\n"), nresponses);
 557                         }
 558                         responses[nresponses] = (char *) malloc (sizeof(char) * 255);
 559                         strncpy (responses[nresponses], optarg, 255);
 560                         nresponses++;
 561                         break;
 562                 case 'c':                                                                       /* critical time threshold */
 563                         if (!is_nonnegative (optarg))
 564                                 usage4 (_("Critical time must be a positive"));
 565                         else {
 566                                 critical_time = strtod (optarg, NULL);
 567                                 check_critical_time = TRUE;
 568                         }
 569                         break;
 570                 case 'w':                                                                       /* warning time threshold */
 571                         if (!is_nonnegative (optarg))
 572                                 usage4 (_("Warning time must be a positive"));
 573                         else {
 574                                 warning_time = strtod (optarg, NULL);
 575                                 check_warning_time = TRUE;
 576                         }
 577                         break;
 578                 case 'v':                                                                       /* verbose */
 579                         verbose++;
 580                         break;
 581                 case 'q':
 582                         ignore_send_quit_failure++;             /* ignore problem sending QUIT */
 583                         break;
 584                 case 't':                                                                       /* timeout */
 585                         if (is_intnonneg (optarg)) {
 586                                 socket_timeout = atoi (optarg);
 587                         }
 588                         else {
 589                                 usage4 (_("Timeout interval must be a positive integer"));
 590                         }
 591                         break;
 592                 case 'D':
 593                 /* Check SSL cert validity */
 594 #ifdef USE_OPENSSL
 595                         if ((temp=strchr(optarg,','))!=NULL) {
 596                             *temp='\0';
 597                             if (!is_intnonneg (optarg))
 598                                usage2 ("Invalid certificate expiration period", optarg);
 599                             days_till_exp_warn = atoi(optarg);
 600                             *temp=',';
 601                             temp++;
 602                             if (!is_intnonneg (temp))
 603                                 usage2 (_("Invalid certificate expiration period"), temp);
 604                             days_till_exp_crit = atoi (temp);
 605                         }
 606                         else {
 607                             days_till_exp_crit=0;
 608                             if (!is_intnonneg (optarg))
 609                                 usage2 ("Invalid certificate expiration period", optarg);
 610                             days_till_exp_warn = atoi (optarg);
 611                         }
 612                         check_cert = TRUE;
 613                         ignore_send_quit_failure = TRUE;
 614 #else
 615                         usage (_("SSL support not available - install OpenSSL and recompile"));
 616 #endif
 617                 case 'S':
 618                 /* starttls */
 619                         use_ssl = TRUE;
 620                         use_ehlo = TRUE;
 621                         break;
 622                 case '4':
 623                         address_family = AF_INET;
 624                         break;
 625                 case '6':
 626 #ifdef USE_IPV6
 627                         address_family = AF_INET6;
 628 #else
 629                         usage4 (_("IPv6 support not available"));
 630 #endif
 631                         break;
 632                 case 'V':                                                                       /* version */
 633                         print_revision (progname, NP_VERSION);
 634                         exit (STATE_UNKNOWN);
 635                 case 'h':                                                                       /* help */
 636                         print_help ();
 637                         exit (STATE_UNKNOWN);
 638                 case '?':                                                                       /* help */
 639                         usage5 ();
 640                 }
 641         }
 642
 643         c = optind;
 644         if (server_address == NULL) {
 645                 if (argv[c]) {
 646                         if (is_host (argv[c]))
 647                                 server_address = argv[c];
 648                         else
 649                                 usage2 (_("Invalid hostname/address"), argv[c]);
 650                 }
 651                 else {
 652                         xasprintf (&server_address, "127.0.0.1");
 653                 }
 654         }
 655
 656         if (server_expect == NULL)
 657                 server_expect = strdup (SMTP_EXPECT);
 658
 659         if (mail_command == NULL)
 660                 mail_command = strdup("MAIL ");
 661
 662         if (from_arg==NULL)
 663                 from_arg = strdup(" ");
 664
 665         return validate_arguments ();
 666 }
 667
 668
 669
 670 int
 671 validate_arguments (void)
 672 {
 673         return OK;
 674 }
 675
 676
 677 void
 678 smtp_quit(void)
 679 {
 680         int bytes;
 681         int n;
 682
 683         n = my_send(SMTP_QUIT, strlen(SMTP_QUIT));
 684         if(n < 0) {
 685                 if(ignore_send_quit_failure) {
 686                         if(verbose) {
 687                                 printf(_("Connection closed by server before sending QUIT command\n"));
 688                         }
 689                         return;
 690                 }
 691                 die (STATE_UNKNOWN,
 692                         _("Connection closed by server before sending QUIT command\n"));
 693         }
 694
 695         if (verbose)
 696                 printf(_("sent %s\n"), "QUIT");
 697
 698         /* read the response but don't care about problems */
 699         bytes = recvlines(buffer, MAX_INPUT_BUFFER);
 700         if (verbose) {
 701                 if (bytes < 0)
 702                         printf(_("recv() failed after QUIT."));
 703                 else if (bytes == 0)
 704                         printf(_("Connection reset by peer."));
 705                 else {
 706                         buffer[bytes] = '\0';
 707                         printf(_("received %s\n"), buffer);
 708                 }
 709         }
 710 }
 711
 712
 713 /*
 714  * Receive one line, copy it into buf and nul-terminate it.  Returns the
 715  * number of bytes written to buf (excluding the '\0') or 0 on EOF or <0 on
 716  * error.
 717  *
 718  * TODO: Reading one byte at a time is very inefficient.  Replace this by a
 719  * function which buffers the data, move that to netutils.c and change
 720  * check_smtp and other plugins to use that.  Also, remove (\r)\n.
 721  */
 722 int
 723 recvline(char *buf, size_t bufsize)
 724 {
 725         int result;
 726         unsigned i;
 727
 728         for (i = result = 0; i < bufsize - 1; i++) {
 729                 if ((result = my_recv(&buf[i], 1)) != 1)
 730                         break;
 731                 if (buf[i] == '\n') {
 732                         buf[++i] = '\0';
 733                         return i;
 734                 }
 735         }
 736         return (result == 1 || i == 0) ? -2 : result;   /* -2 if out of space */
 737 }
 738
 739
 740 /*
 741  * Receive one or more lines, copy them into buf and nul-terminate it.  Returns
 742  * the number of bytes written to buf (excluding the '\0') or 0 on EOF or <0 on
 743  * error.  Works for all protocols which format multiline replies as follows:
 744  *
 745  * ``The format for multiline replies requires that every line, except the last,
 746  * begin with the reply code, followed immediately by a hyphen, `-' (also known
 747  * as minus), followed by text.  The last line will begin with the reply code,
 748  * followed immediately by <SP>, optionally some text, and <CRLF>.  As noted
 749  * above, servers SHOULD send the <SP> if subsequent text is not sent, but
 750  * clients MUST be prepared for it to be omitted.'' (RFC 2821, 4.2.1)
 751  *
 752  * TODO: Move this to netutils.c.  Also, remove \r and possibly the final \n.
 753  */
 754 int
 755 recvlines(char *buf, size_t bufsize)
 756 {
 757         int result, i;
 758
 759         for (i = 0; /* forever */; i += result)
 760                 if (!((result = recvline(buf + i, bufsize - i)) > 3 &&
 761                     isdigit((int)buf[i]) &&
 762                     isdigit((int)buf[i + 1]) &&
 763                     isdigit((int)buf[i + 2]) &&
 764                     buf[i + 3] == '-'))
 765                         break;
 766
 767         return (result <= 0) ? result : result + i;
 768 }
 769
 770
 771 int
 772 my_close (void)
 773 {
 774 #ifdef HAVE_SSL
 775   np_net_ssl_cleanup();
 776 #endif
 777   return close(sd);
 778 }
 779
 780
 781 void
 782 print_help (void)
 783 {
 784         char *myport;
 785         xasprintf (&myport, "%d", SMTP_PORT);
 786
 787         print_revision (progname, NP_VERSION);
 788
 789         printf ("Copyright (c) 1999-2001 Ethan Galstad <nagios@nagios.org>\n");
 790         printf (COPYRIGHT, copyright, email);
 791
 792         printf("%s\n", _("This plugin will attempt to open an SMTP connection with the host."));
 793
 794   printf ("\n\n");
 795
 796         print_usage ();
 797
 798         printf (UT_HELP_VRSN);
 799         printf (UT_EXTRA_OPTS);
 800
 801         printf (UT_HOST_PORT, 'p', myport);
 802
 803         printf (UT_IPv46);
 804
 805         printf (" %s\n", "-e, --expect=STRING");
 806   printf (_("    String to expect in first line of server response (default: '%s')\n"), SMTP_EXPECT);
 807   printf (" %s\n", "-C, --command=STRING");
 808   printf ("    %s\n", _("SMTP command (may be used repeatedly)"));
 809   printf (" %s\n", "-R, --response=STRING");
 810   printf ("    %s\n", _("Expected response to command (may be used repeatedly)"));
 811   printf (" %s\n", "-f, --from=STRING");
 812   printf ("    %s\n", _("FROM-address to include in MAIL command, required by Exchange 2000")),
 813   printf (" %s\n", "-F, --fqdn=STRING");
 814   printf ("    %s\n", _("FQDN used for HELO"));
 815 #ifdef HAVE_SSL
 816   printf (" %s\n", "-D, --certificate=INTEGER[,INTEGER]");
 817   printf ("    %s\n", _("Minimum number of days a certificate has to be valid."));
 818   printf (" %s\n", "-S, --starttls");
 819   printf ("    %s\n", _("Use STARTTLS for the connection."));
 820 #endif
 821
 822         printf (" %s\n", "-A, --authtype=STRING");
 823   printf ("    %s\n", _("SMTP AUTH type to check (default none, only LOGIN supported)"));
 824   printf (" %s\n", "-U, --authuser=STRING");
 825   printf ("    %s\n", _("SMTP AUTH username"));
 826   printf (" %s\n", "-P, --authpass=STRING");
 827   printf ("    %s\n", _("SMTP AUTH password"));
 828   printf (" %s\n", "-q, --ignore-quit-failure");
 829   printf ("    %s\n", _("Ignore failure when sending QUIT command to server"));
 830
 831         printf (UT_WARN_CRIT);
 832
 833         printf (UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
 834
 835         printf (UT_VERBOSE);
 836
 837         printf("\n");
 838         printf ("%s\n", _("Successul connects return STATE_OK, refusals and timeouts return"));
 839   printf ("%s\n", _("STATE_CRITICAL, other errors return STATE_UNKNOWN.  Successful"));
 840   printf ("%s\n", _("connects, but incorrect reponse messages from the host result in"));
 841   printf ("%s\n", _("STATE_WARNING return values."));
 842
 843         printf (UT_SUPPORT);
 844 }
 845
 846
 847
 848 void
 849 print_usage (void)
 850 {
 851   printf ("%s\n", _("Usage:"));
 852   printf ("%s -H host [-p port] [-4|-6] [-e expect] [-C command] [-R response] [-f from addr]\n", progname);
 853   printf ("[-A authtype -U authuser -P authpass] [-w warn] [-c crit] [-t timeout] [-q]\n");
 854   printf ("[-F fqdn] [-S] [-D warn days cert expire[,crit days cert expire]] [-v] \n");
 855 }
 856