plugins/check_smtp.c

   1 /******************************************************************************
   2
   3  This program is free software; you can redistribute it and/or modify
   4  it under the terms of the GNU General Public License as published by
   5  the Free Software Foundation; either version 2 of the License, or
   6  (at your option) any later version.
   7
   8  This program is distributed in the hope that it will be useful,
   9  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  GNU General Public License for more details.
  12
  13  You should have received a copy of the GNU General Public License
  14  along with this program; if not, write to the Free Software
  15  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  16
  17  $Id$
  18
  19 ******************************************************************************/
  20
  21 const char *progname = "check_smtp";
  22 const char *revision = "$Revision$";
  23 const char *copyright = "2000-2004";
  24 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  25
  26 #include "common.h"
  27 #include "netutils.h"
  28 #include "utils.h"
  29
  30 #ifdef HAVE_SSL_H
  31 #  include <rsa.h>
  32 #  include <crypto.h>
  33 #  include <x509.h>
  34 #  include <pem.h>
  35 #  include <ssl.h>
  36 #  include <err.h>
  37 #else
  38 #  ifdef HAVE_OPENSSL_SSL_H
  39 #    include <openssl/rsa.h>
  40 #    include <openssl/crypto.h>
  41 #    include <openssl/x509.h>
  42 #    include <openssl/pem.h>
  43 #    include <openssl/ssl.h>
  44 #    include <openssl/err.h>
  45 #  endif
  46 #endif
  47
  48 #ifdef HAVE_SSL
  49
  50 int check_cert = FALSE;
  51 int days_till_exp;
  52 SSL_CTX *ctx;
  53 SSL *ssl;
  54 X509 *server_cert;
  55 int connect_STARTTLS (void);
  56 int check_certificate (X509 **);
  57 #endif
  58
  59 enum {
  60         SMTP_PORT       = 25
  61 };
  62 const char *SMTP_EXPECT = "220";
  63 const char *SMTP_HELO = "HELO ";
  64 const char *SMTP_QUIT   = "QUIT\r\n";
  65 const char *SMTP_STARTTLS = "STARTTLS\r\n";
  66
  67 int process_arguments (int, char **);
  68 int validate_arguments (void);
  69 void print_help (void);
  70 void print_usage (void);
  71 int myrecv(void);
  72 int my_close(void);
  73
  74 #ifdef HAVE_REGEX_H
  75 #include <regex.h>
  76 char regex_expect[MAX_INPUT_BUFFER] = "";
  77 regex_t preg;
  78 regmatch_t pmatch[10];
  79 char timestamp[20] = "";
  80 char errbuf[MAX_INPUT_BUFFER];
  81 int cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
  82 int eflags = 0;
  83 int errcode, excode;
  84 #endif
  85
  86 int server_port = SMTP_PORT;
  87 char *server_address = NULL;
  88 char *server_expect = NULL;
  89 int smtp_use_dummycmd = 0;
  90 char *mail_command = NULL;
  91 char *from_arg = NULL;
  92 int ncommands=0;
  93 int command_size=0;
  94 int nresponses=0;
  95 int response_size=0;
  96 char **commands = NULL;
  97 char **responses = NULL;
  98 int warning_time = 0;
  99 int check_warning_time = FALSE;
 100 int critical_time = 0;
 101 int check_critical_time = FALSE;
 102 int verbose = 0;
 103 int use_ssl = FALSE;
 104 int sd;
 105 char buffer[MAX_INPUT_BUFFER];
 106 enum {
 107   TCP_PROTOCOL = 1,
 108   UDP_PROTOCOL = 2,
 109   MAXBUF = 1024
 110 };
 111
 112 int
 113 main (int argc, char **argv)
 114 {
 115
 116         int n = 0;
 117         double elapsed_time;
 118         long microsec;
 119         int result = STATE_UNKNOWN;
 120         char *cmd_str = NULL;
 121         char *helocmd = NULL;
 122         struct timeval tv;
 123
 124         setlocale (LC_ALL, "");
 125         bindtextdomain (PACKAGE, LOCALEDIR);
 126         textdomain (PACKAGE);
 127
 128         if (process_arguments (argc, argv) == ERROR)
 129                 usage4 (_("Could not parse arguments"));
 130
 131         /* initialize the HELO command with the localhostname */
 132 #ifndef HOST_MAX_BYTES
 133 #define HOST_MAX_BYTES 255
 134 #endif
 135         helocmd = malloc (HOST_MAX_BYTES);
 136         gethostname(helocmd, HOST_MAX_BYTES);
 137         asprintf (&helocmd, "%s%s%s", SMTP_HELO, helocmd, "\r\n");
 138
 139         /* initialize the MAIL command with optional FROM command  */
 140         asprintf (&cmd_str, "%sFROM: %s%s", mail_command, from_arg, "\r\n");
 141
 142         if (verbose && smtp_use_dummycmd)
 143                 printf ("FROM CMD: %s", cmd_str);
 144
 145         /* initialize alarm signal handling */
 146         (void) signal (SIGALRM, socket_timeout_alarm_handler);
 147
 148         /* set socket timeout */
 149         (void) alarm (socket_timeout);
 150
 151         /* start timer */
 152         gettimeofday (&tv, NULL);
 153
 154         /* try to connect to the host at the given port number */
 155         result = my_tcp_connect (server_address, server_port, &sd);
 156
 157         if (result == STATE_OK) { /* we connected */
 158
 159                 /* watch for the SMTP connection string and */
 160                 /* return a WARNING status if we couldn't read any data */
 161                 if (recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0) == -1) {
 162                         printf (_("recv() failed\n"));
 163                         result = STATE_WARNING;
 164                 }
 165                 else {
 166                         if (verbose)
 167                                 printf ("%s", buffer);
 168                         /* strip the buffer of carriage returns */
 169                         strip (buffer);
 170                         /* make sure we find the response we are looking for */
 171                         if (!strstr (buffer, server_expect)) {
 172                                 if (server_port == SMTP_PORT)
 173                                         printf (_("Invalid SMTP response received from host\n"));
 174                                 else
 175                                         printf (_("Invalid SMTP response received from host on port %d\n"),
 176                                                                         server_port);
 177                                 result = STATE_WARNING;
 178                         }
 179                 }
 180
 181                 /* send the HELO command */
 182                 send(sd, helocmd, strlen(helocmd), 0);
 183
 184                 /* allow for response to helo command to reach us */
 185                 read (sd, buffer, MAXBUF - 1);
 186
 187 #ifdef HAVE_SSL
 188                 if(use_ssl) {
 189                   /* send the STARTTLS command */
 190                   send(sd, SMTP_STARTTLS, strlen(SMTP_STARTTLS), 0);
 191
 192                   recv(sd,buffer, MAX_INPUT_BUFFER-1, 0); /* wait for it */
 193                   if (!strstr (buffer, server_expect)) {
 194                     printf (_("Server does not support STARTTLS\n"));
 195                     return STATE_UNKNOWN;
 196                   }
 197                   if(connect_STARTTLS() != OK) {
 198                     printf (_("CRITICAL - Cannot create SSL context.\n"));
 199                     return STATE_CRITICAL;
 200                   }
 201                   if ( check_cert ) {
 202                     if ((server_cert = SSL_get_peer_certificate (ssl)) != NULL) {
 203                       result = check_certificate (&server_cert);
 204                       X509_free(server_cert);
 205                     }
 206                     else {
 207                       printf (_("CRITICAL - Cannot retrieve server certificate.\n"));
 208                       result = STATE_CRITICAL;
 209
 210                     }
 211                     my_close();
 212                     return result;
 213                   }
 214                 }
 215 #endif
 216
 217                 /* sendmail will syslog a "NOQUEUE" error if session does not attempt
 218                  * to do something useful. This can be prevented by giving a command
 219                  * even if syntax is illegal (MAIL requires a FROM:<...> argument)
 220                  *
 221                  * According to rfc821 you can include a null reversepath in the from command
 222                  * - but a log message is generated on the smtp server.
 223                  *
 224                  * You can disable sending mail_command with '--nocommand'
 225                  * Use the -f option to provide a FROM address
 226                  */
 227                 if (smtp_use_dummycmd) {
 228 #ifdef HAVE_SSL
 229                   if (use_ssl)
 230                     SSL_write(ssl, cmd_str, strlen(cmd_str));
 231                   else
 232 #endif
 233                   send(sd, cmd_str, strlen(cmd_str), 0);
 234                   myrecv();
 235                   if (verbose)
 236                     printf("%s", buffer);
 237                 }
 238
 239                 while (n < ncommands) {
 240                         asprintf (&cmd_str, "%s%s", commands[n], "\r\n");
 241 #ifdef HAVE_SSL
 242                         if (use_ssl)
 243                           SSL_write(ssl,cmd_str, strlen(cmd_str));
 244                         else
 245 #endif
 246                         send(sd, cmd_str, strlen(cmd_str), 0);
 247                         myrecv();
 248                         if (verbose)
 249                                 printf("%s", buffer);
 250                         strip (buffer);
 251                         if (n < nresponses) {
 252 #ifdef HAVE_REGEX_H
 253                                 cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
 254                                 errcode = regcomp (&preg, responses[n], cflags);
 255                                 if (errcode != 0) {
 256                                         regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
 257                                         printf (_("Could Not Compile Regular Expression"));
 258                                         return ERROR;
 259                                 }
 260                                 excode = regexec (&preg, buffer, 10, pmatch, eflags);
 261                                 if (excode == 0) {
 262                                         result = STATE_OK;
 263                                 }
 264                                 else if (excode == REG_NOMATCH) {
 265                                         result = STATE_WARNING;
 266                                         printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]);
 267                                 }
 268                                 else {
 269                                         regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER);
 270                                         printf (_("Execute Error: %s\n"), errbuf);
 271                                         result = STATE_UNKNOWN;
 272                                 }
 273 #else
 274                                 if (strstr(buffer, responses[n])!=buffer) {
 275                                         result = STATE_WARNING;
 276                                         printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]);
 277                                 }
 278 #endif
 279                         }
 280                         n++;
 281                 }
 282
 283                 /* tell the server we're done */
 284 #ifdef HAVE_SSL
 285                 if (use_ssl)
 286                   SSL_write(ssl,SMTP_QUIT, strlen (SMTP_QUIT));
 287                 else
 288 #endif
 289                 send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0);
 290
 291                 /* finally close the connection */
 292                 close (sd);
 293         }
 294
 295         /* reset the alarm */
 296         alarm (0);
 297
 298         microsec = deltime (tv);
 299         elapsed_time = (double)microsec / 1.0e6;
 300
 301         if (result == STATE_OK) {
 302                 if (check_critical_time && elapsed_time > (double) critical_time)
 303                         result = STATE_CRITICAL;
 304                 else if (check_warning_time && elapsed_time > (double) warning_time)
 305                         result = STATE_WARNING;
 306         }
 307
 308         printf (_("SMTP %s - %.3f sec. response time%s%s|%s\n"),
 309                 state_text (result), elapsed_time,
 310           verbose?", ":"", verbose?buffer:"",
 311                 fperfdata ("time", elapsed_time, "s",
 312                           (int)check_warning_time, warning_time,
 313                           (int)check_critical_time, critical_time,
 314                           TRUE, 0, FALSE, 0));
 315
 316         return result;
 317 }
 318
 319
 320
 321 /* process command-line arguments */
 322 int
 323 process_arguments (int argc, char **argv)
 324 {
 325         int c;
 326
 327         int option = 0;
 328         static struct option longopts[] = {
 329                 {"hostname", required_argument, 0, 'H'},
 330                 {"expect", required_argument, 0, 'e'},
 331                 {"critical", required_argument, 0, 'c'},
 332                 {"warning", required_argument, 0, 'w'},
 333                 {"timeout", required_argument, 0, 't'},
 334                 {"port", required_argument, 0, 'p'},
 335                 {"from", required_argument, 0, 'f'},
 336                 {"command", required_argument, 0, 'C'},
 337                 {"response", required_argument, 0, 'R'},
 338                 {"nocommand", required_argument, 0, 'n'},
 339                 {"verbose", no_argument, 0, 'v'},
 340                 {"version", no_argument, 0, 'V'},
 341                 {"use-ipv4", no_argument, 0, '4'},
 342                 {"use-ipv6", no_argument, 0, '6'},
 343                 {"help", no_argument, 0, 'h'},
 344                 {"starttls",no_argument,0,'S'},
 345                 {"certificate",required_argument,0,'D'},
 346                 {0, 0, 0, 0}
 347         };
 348
 349         if (argc < 2)
 350                 return ERROR;
 351
 352         for (c = 1; c < argc; c++) {
 353                 if (strcmp ("-to", argv[c]) == 0)
 354                         strcpy (argv[c], "-t");
 355                 else if (strcmp ("-wt", argv[c]) == 0)
 356                         strcpy (argv[c], "-w");
 357                 else if (strcmp ("-ct", argv[c]) == 0)
 358                         strcpy (argv[c], "-c");
 359         }
 360
 361         while (1) {
 362                 c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:R:SD:",
 363                                  longopts, &option);
 364
 365                 if (c == -1 || c == EOF)
 366                         break;
 367
 368                 switch (c) {
 369                 case 'H':                                                                       /* hostname */
 370                         if (is_host (optarg)) {
 371                                 server_address = optarg;
 372                         }
 373                         else {
 374                                 usage2 (_("Invalid hostname/address"), optarg);
 375                         }
 376                         break;
 377                 case 'p':                                                                       /* port */
 378                         if (is_intpos (optarg))
 379                                 server_port = atoi (optarg);
 380                         else
 381                                 usage4 (_("Port must be a positive integer"));
 382                         break;
 383                 case 'f':                                                                       /* from argument */
 384                         from_arg = optarg;
 385                         smtp_use_dummycmd = 1;
 386                         break;
 387                 case 'e':                                                                       /* server expect string on 220  */
 388                         server_expect = optarg;
 389                         break;
 390                 case 'C':                                                                       /* commands  */
 391                         if (ncommands >= command_size) {
 392                                 commands = realloc (commands, command_size+8);
 393                                 if (commands == NULL)
 394                                         die (STATE_UNKNOWN,
 395                                              _("Could not realloc() units [%d]\n"), ncommands);
 396                         }
 397                         commands[ncommands] = optarg;
 398                         ncommands++;
 399                         break;
 400                 case 'R':                                                                       /* server responses */
 401                         if (nresponses >= response_size) {
 402                                 responses = realloc (responses, response_size+8);
 403                                 if (responses == NULL)
 404                                         die (STATE_UNKNOWN,
 405                                              _("Could not realloc() units [%d]\n"), nresponses);
 406                         }
 407                         responses[nresponses] = optarg;
 408                         nresponses++;
 409                         break;
 410                 case 'c':                                                                       /* critical time threshold */
 411                         if (is_intnonneg (optarg)) {
 412                                 critical_time = atoi (optarg);
 413                                 check_critical_time = TRUE;
 414                         }
 415                         else {
 416                                 usage4 (_("Critical time must be a positive integer"));
 417                         }
 418                         break;
 419                 case 'w':                                                                       /* warning time threshold */
 420                         if (is_intnonneg (optarg)) {
 421                                 warning_time = atoi (optarg);
 422                                 check_warning_time = TRUE;
 423                         }
 424                         else {
 425                                 usage4 (_("Warning time must be a positive integer"));
 426                         }
 427                         break;
 428                 case 'v':                                                                       /* verbose */
 429                         verbose++;
 430                         break;
 431                 case 't':                                                                       /* timeout */
 432                         if (is_intnonneg (optarg)) {
 433                                 socket_timeout = atoi (optarg);
 434                         }
 435                         else {
 436                                 usage4 (_("Timeout interval must be a positive integer"));
 437                         }
 438                         break;
 439                 case 'S':
 440                 /* starttls */
 441                         use_ssl = TRUE;
 442                         break;
 443                 case 'D':
 444                 /* Check SSL cert validity */
 445 #ifdef HAVE_SSL
 446                         if (!is_intnonneg (optarg))
 447                                 usage2 ("Invalid certificate expiration period",optarg);
 448                                 days_till_exp = atoi (optarg);
 449                                 check_cert = TRUE;
 450 #else
 451                                 usage (_("SSL support not available - install OpenSSL and recompile"));
 452 #endif
 453                         break;
 454                 case '4':
 455                         address_family = AF_INET;
 456                         break;
 457                 case '6':
 458 #ifdef USE_IPV6
 459                         address_family = AF_INET6;
 460 #else
 461                         usage4 (_("IPv6 support not available"));
 462 #endif
 463                         break;
 464                 case 'V':                                                                       /* version */
 465                         print_revision (progname, revision);
 466                         exit (STATE_OK);
 467                 case 'h':                                                                       /* help */
 468                         print_help ();
 469                         exit (STATE_OK);
 470                 case '?':                                                                       /* help */
 471                         usage2 (_("Unknown argument"), optarg);
 472                 }
 473         }
 474
 475         c = optind;
 476         if (server_address == NULL) {
 477                 if (argv[c]) {
 478                         if (is_host (argv[c]))
 479                                 server_address = argv[c];
 480                         else
 481                                 usage2 (_("Invalid hostname/address"), argv[c]);
 482                 }
 483                 else {
 484                         asprintf (&server_address, "127.0.0.1");
 485                 }
 486         }
 487
 488         if (server_expect == NULL)
 489                 server_expect = strdup (SMTP_EXPECT);
 490
 491         if (mail_command == NULL)
 492                 mail_command = strdup("MAIL ");
 493
 494         if (from_arg==NULL)
 495                 from_arg = strdup(" ");
 496
 497         return validate_arguments ();
 498 }
 499
 500
 501
 502 int
 503 validate_arguments (void)
 504 {
 505         return OK;
 506 }
 507
 508
 509
 510 void
 511 print_help (void)
 512 {
 513         char *myport;
 514         asprintf (&myport, "%d", SMTP_PORT);
 515
 516         print_revision (progname, revision);
 517
 518         printf ("Copyright (c) 1999-2001 Ethan Galstad <nagios@nagios.org>\n");
 519         printf (COPYRIGHT, copyright, email);
 520
 521         printf(_("This plugin will attempt to open an SMTP connection with the host.\n\n"));
 522
 523         print_usage ();
 524
 525         printf (_(UT_HELP_VRSN));
 526
 527         printf (_(UT_HOST_PORT), 'p', myport);
 528
 529         printf (_(UT_IPv46));
 530
 531         printf (_("\
 532  -e, --expect=STRING\n\
 533    String to expect in first line of server response (default: '%s')\n\
 534  -n, nocommand\n\
 535    Suppress SMTP command\n\
 536  -C, --command=STRING\n\
 537    SMTP command (may be used repeatedly)\n\
 538  -R, --command=STRING\n\
 539    Expected response to command (may be used repeatedly)\n\
 540  -f, --from=STRING\n\
 541    FROM-address to include in MAIL command, required by Exchange 2000\n"),
 542                 SMTP_EXPECT);
 543 #ifdef HAVE_SSL
 544         printf (_("\
 545  -D, --certificate=INTEGER\n\
 546     Minimum number of days a certificate has to be valid.\n\
 547  -S, --starttls\n\
 548     Use STARTTLS for the connection.\n"));
 549 #endif
 550
 551         printf (_(UT_WARN_CRIT));
 552
 553         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 554
 555         printf (_(UT_VERBOSE));
 556
 557         printf(_("\n\
 558 Successul connects return STATE_OK, refusals and timeouts return\n\
 559 STATE_CRITICAL, other errors return STATE_UNKNOWN.  Successful\n\
 560 connects, but incorrect reponse messages from the host result in\n\
 561 STATE_WARNING return values.\n"));
 562
 563         printf (_(UT_SUPPORT));
 564 }
 565
 566
 567
 568 void
 569 print_usage (void)
 570 {
 571         printf ("\
 572 Usage: %s -H host [-p port] [-e expect] [-C command] [-f from addr]\n\
 573                   [-w warn] [-c crit] [-t timeout] [-S] [-D days] [-n] [-v] [-4|-6]\n", progname);
 574 }
 575
 576 #ifdef HAVE_SSL
 577 int
 578 connect_STARTTLS (void)
 579 {
 580   SSL_METHOD *meth;
 581
 582   /* Initialize SSL context */
 583   SSLeay_add_ssl_algorithms ();
 584   meth = SSLv2_client_method ();
 585   SSL_load_error_strings ();
 586   if ((ctx = SSL_CTX_new (meth)) == NULL)
 587     {
 588       printf(_("CRITICAL - Cannot create SSL context.\n"));
 589       return STATE_CRITICAL;
 590     }
 591   /* do the SSL handshake */
 592   if ((ssl = SSL_new (ctx)) != NULL)
 593     {
 594       SSL_set_fd (ssl, sd);
 595       /* original version checked for -1
 596          I look for success instead (1) */
 597       if (SSL_connect (ssl) == 1)
 598         return OK;
 599       ERR_print_errors_fp (stderr);
 600     }
 601   else
 602     {
 603       printf (_("CRITICAL - Cannot initiate SSL handshake.\n"));
 604     }
 605   /* this causes a seg faul
 606      not sure why, being sloppy
 607      and commenting it out */
 608   /*  SSL_free (ssl); */
 609   SSL_CTX_free(ctx);
 610   my_close();
 611
 612   return STATE_CRITICAL;
 613 }
 614
 615 int
 616 check_certificate (X509 ** certificate)
 617 {
 618   ASN1_STRING *tm;
 619   int offset;
 620   struct tm stamp;
 621   int days_left;
 622
 623   /* Retrieve timestamp of certificate */
 624   tm = X509_get_notAfter (*certificate);
 625
 626   /* Generate tm structure to process timestamp */
 627   if (tm->type == V_ASN1_UTCTIME) {
 628     if (tm->length < 10) {
 629       printf (_("CRITICAL - Wrong time format in certificate.\n"));
 630       return STATE_CRITICAL;
 631     }
 632     else {
 633       stamp.tm_year = (tm->data[0] - '0') * 10 + (tm->data[1] - '0');
 634       if (stamp.tm_year < 50)
 635         stamp.tm_year += 100;
 636       offset = 0;
 637     }
 638   }
 639   else {
 640     if (tm->length < 12) {
 641       printf (_("CRITICAL - Wrong time format in certificate.\n"));
 642       return STATE_CRITICAL;
 643     }
 644     else {
 645       stamp.tm_year =
 646         (tm->data[0] - '0') * 1000 + (tm->data[1] - '0') * 100 +
 647         (tm->data[2] - '0') * 10 + (tm->data[3] - '0');
 648       stamp.tm_year -= 1900;
 649       offset = 2;
 650     }
 651   }
 652   stamp.tm_mon =
 653     (tm->data[2 + offset] - '0') * 10 + (tm->data[3 + offset] - '0') - 1;
 654   stamp.tm_mday =
 655     (tm->data[4 + offset] - '0') * 10 + (tm->data[5 + offset] - '0');
 656   stamp.tm_hour =
 657     (tm->data[6 + offset] - '0') * 10 + (tm->data[7 + offset] - '0');
 658   stamp.tm_min =
 659     (tm->data[8 + offset] - '0') * 10 + (tm->data[9 + offset] - '0');
 660   stamp.tm_sec = 0;
 661   stamp.tm_isdst = -1;
 662
 663   days_left = (mktime (&stamp) - time (NULL)) / 86400;
 664   snprintf
 665     (timestamp, sizeof(timestamp), "%02d/%02d/%04d %02d:%02d",
 666      stamp.tm_mon + 1,
 667      stamp.tm_mday, stamp.tm_year + 1900, stamp.tm_hour, stamp.tm_min);
 668
 669   if (days_left > 0 && days_left <= days_till_exp) {
 670     printf ("Certificate expires in %d day(s) (%s).\n", days_left, timestamp);
 671     return STATE_WARNING;
 672   }
 673   if (days_left < 0) {
 674     printf ("Certificate expired on %s.\n", timestamp);
 675     return STATE_CRITICAL;
 676   }
 677
 678   if (days_left == 0) {
 679     printf ("Certificate expires today (%s).\n", timestamp);
 680     return STATE_WARNING;
 681   }
 682
 683   printf ("Certificate will expire on %s.\n", timestamp);
 684
 685   return STATE_OK;
 686 }
 687 #endif
 688
 689 int
 690 myrecv (void)
 691 {
 692   int i;
 693
 694 #ifdef HAVE_SSL
 695   if (use_ssl) {
 696     i = SSL_read (ssl, buffer, MAXBUF - 1);
 697   }
 698   else {
 699 #endif
 700     i = read (sd, buffer, MAXBUF - 1);
 701 #ifdef HAVE_SSL
 702   }
 703 #endif
 704   return i;
 705 }
 706
 707 int
 708 my_close (void)
 709 {
 710 #ifdef HAVE_SSL
 711   if (use_ssl == TRUE) {
 712     SSL_shutdown (ssl);
 713     SSL_free (ssl);
 714     SSL_CTX_free (ctx);
 715     return 0;
 716   }
 717   else {
 718 #endif
 719     return close(sd);
 720 #ifdef HAVE_SSL
 721   }
 722 #endif
 723 }