plugins/check_ping.c

   1 /******************************************************************************
   2 *
   3 * Nagios check_ping plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 2000-2006 nagios-plugins team
   7 *
   8 * Last Modified: $Date$
   9 *
  10 * Description:
  11 *
  12 * This file contains the check_ping plugin
  13 *
  14 *  Use the ping program to check connection statistics for a remote host.
  15 *
  16 *
  17 * License Information:
  18 *
  19 * This program is free software; you can redistribute it and/or modify
  20 * it under the terms of the GNU General Public License as published by
  21 * the Free Software Foundation; either version 2 of the License, or
  22 * (at your option) any later version.
  23 *
  24 * This program is distributed in the hope that it will be useful,
  25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27 * GNU General Public License for more details.
  28 *
  29 * You should have received a copy of the GNU General Public License
  30 * along with this program; if not, write to the Free Software
  31 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  32
  33  $Id$
  34
  35 ******************************************************************************/
  36
  37 const char *progname = "check_ping";
  38 const char *revision = "$Revision$";
  39 const char *copyright = "2000-2006";
  40 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  41
  42 #include "common.h"
  43 #include "netutils.h"
  44 #include "popen.h"
  45 #include "utils.h"
  46
  47 #define WARN_DUPLICATES "DUPLICATES FOUND! "
  48 #define UNKNOWN_TRIP_TIME -1.0  /* -1 seconds */
  49
  50 enum {
  51         UNKNOWN_PACKET_LOSS = 200,    /* 200% */
  52         DEFAULT_MAX_PACKETS = 5       /* default no. of ICMP ECHO packets */
  53 };
  54
  55 int process_arguments (int, char **);
  56 int get_threshold (char *, float *, int *);
  57 int validate_arguments (void);
  58 int run_ping (const char *cmd, const char *addr);
  59 int error_scan (char buf[MAX_INPUT_BUFFER], const char *addr);
  60 void print_usage (void);
  61 void print_help (void);
  62
  63 int display_html = FALSE;
  64 int wpl = UNKNOWN_PACKET_LOSS;
  65 int cpl = UNKNOWN_PACKET_LOSS;
  66 float wrta = UNKNOWN_TRIP_TIME;
  67 float crta = UNKNOWN_TRIP_TIME;
  68 char **addresses = NULL;
  69 int n_addresses = 0;
  70 int max_addr = 1;
  71 int max_packets = -1;
  72 int verbose = 0;
  73
  74 float rta = UNKNOWN_TRIP_TIME;
  75 int pl = UNKNOWN_PACKET_LOSS;
  76
  77 char *warn_text;
  78
  79
  80
  81 int
  82 main (int argc, char **argv)
  83 {
  84         char *cmd = NULL;
  85         char *rawcmd = NULL;
  86         int result = STATE_UNKNOWN;
  87         int this_result = STATE_UNKNOWN;
  88         int i;
  89
  90         setlocale (LC_ALL, "");
  91         setlocale (LC_NUMERIC, "C");
  92         bindtextdomain (PACKAGE, LOCALEDIR);
  93         textdomain (PACKAGE);
  94
  95         addresses = malloc (sizeof(char*) * max_addr);
  96         addresses[0] = NULL;
  97
  98         if (process_arguments (argc, argv) == ERROR)
  99                 usage4 (_("Could not parse arguments"));
 100
 101         /* Set signal handling and alarm */
 102         if (signal (SIGALRM, popen_timeout_alarm_handler) == SIG_ERR) {
 103                 usage4 (_("Cannot catch SIGALRM"));
 104         }
 105
 106         /* If ./configure finds ping has timeout values, set plugin alarm slightly
 107          * higher so that we can use response from command line ping */
 108 #if defined(PING_PACKETS_FIRST) && defined(PING_HAS_TIMEOUT)
 109         alarm (timeout_interval + 1);
 110 #else
 111         alarm (timeout_interval);
 112 #endif
 113
 114         for (i = 0 ; i < n_addresses ; i++) {
 115
 116 #ifdef PING6_COMMAND
 117                 if (address_family != AF_INET && is_inet6_addr(addresses[i]))
 118                         rawcmd = strdup(PING6_COMMAND);
 119                 else
 120                         rawcmd = strdup(PING_COMMAND);
 121 #else
 122                 rawcmd = strdup(PING_COMMAND);
 123 #endif
 124
 125                 /* does the host address of number of packets argument come first? */
 126 #ifdef PING_PACKETS_FIRST
 127 # ifdef PING_HAS_TIMEOUT
 128                 asprintf (&cmd, rawcmd, timeout_interval, max_packets, addresses[i]);
 129 # else
 130                 asprintf (&cmd, rawcmd, max_packets, addresses[i]);
 131 # endif
 132 #else
 133                 asprintf (&cmd, rawcmd, addresses[i], max_packets);
 134 #endif
 135
 136                 if (verbose >= 2)
 137                         printf ("CMD: %s\n", cmd);
 138
 139                 /* run the command */
 140                 this_result = run_ping (cmd, addresses[i]);
 141
 142                 if (pl == UNKNOWN_PACKET_LOSS || rta < 0.0) {
 143                         printf ("%s\n", cmd);
 144                         die (STATE_UNKNOWN,
 145                                    _("CRITICAL - Could not interpret output from ping command\n"));
 146                 }
 147
 148                 if (pl >= cpl || rta >= crta || rta < 0)
 149                         this_result = STATE_CRITICAL;
 150                 else if (pl >= wpl || rta >= wrta)
 151                         this_result = STATE_WARNING;
 152                 else if (pl >= 0 && rta >= 0)
 153                         this_result = max_state (STATE_OK, this_result);
 154
 155                 if (n_addresses > 1 && this_result != STATE_UNKNOWN)
 156                         die (STATE_OK, "%s is alive\n", addresses[i]);
 157
 158                 if (display_html == TRUE)
 159                         printf ("<A HREF='%s/traceroute.cgi?%s'>", CGIURL, addresses[i]);
 160                 if (pl == 100)
 161                         printf (_("PING %s - %sPacket loss = %d%%"), state_text (this_result), warn_text,
 162                                                         pl);
 163                 else
 164                         printf (_("PING %s - %sPacket loss = %d%%, RTA = %2.2f ms"),
 165                                                         state_text (this_result), warn_text, pl, rta);
 166                 if (display_html == TRUE)
 167                         printf ("</A>");
 168                 printf ("\n");
 169
 170                 if (verbose >= 2)
 171                         printf ("%f:%d%% %f:%d%%\n", wrta, wpl, crta, cpl);
 172
 173                 result = max_state (result, this_result);
 174                 free (rawcmd);
 175                 free (cmd);
 176         }
 177
 178         return result;
 179 }
 180
 181
 182
 183 /* process command-line arguments */
 184 int
 185 process_arguments (int argc, char **argv)
 186 {
 187         int c = 1;
 188         char *ptr;
 189
 190         int option = 0;
 191         static struct option longopts[] = {
 192                 STD_LONG_OPTS,
 193                 {"packets", required_argument, 0, 'p'},
 194                 {"nohtml", no_argument, 0, 'n'},
 195                 {"link", no_argument, 0, 'L'},
 196                 {"use-ipv4", no_argument, 0, '4'},
 197                 {"use-ipv6", no_argument, 0, '6'},
 198                 {0, 0, 0, 0}
 199         };
 200
 201         if (argc < 2)
 202                 return ERROR;
 203
 204         for (c = 1; c < argc; c++) {
 205                 if (strcmp ("-to", argv[c]) == 0)
 206                         strcpy (argv[c], "-t");
 207                 if (strcmp ("-nohtml", argv[c]) == 0)
 208                         strcpy (argv[c], "-n");
 209         }
 210
 211         while (1) {
 212                 c = getopt_long (argc, argv, "VvhnL46t:c:w:H:p:", longopts, &option);
 213
 214                 if (c == -1 || c == EOF)
 215                         break;
 216
 217                 switch (c) {
 218                 case '?':       /* usage */
 219                         usage5 ();
 220                 case 'h':       /* help */
 221                         print_help ();
 222                         exit (STATE_OK);
 223                         break;
 224                 case 'V':       /* version */
 225                         print_revision (progname, revision);
 226                         exit (STATE_OK);
 227                         break;
 228                 case 't':       /* timeout period */
 229                         timeout_interval = atoi (optarg);
 230                         break;
 231                 case 'v':       /* verbose mode */
 232                         verbose++;
 233                         break;
 234                 case '4':       /* IPv4 only */
 235                         address_family = AF_INET;
 236                         break;
 237                 case '6':       /* IPv6 only */
 238 #ifdef USE_IPV6
 239                         address_family = AF_INET6;
 240 #else
 241                         usage (_("IPv6 support not available\n"));
 242 #endif
 243                         break;
 244                 case 'H':       /* hostname */
 245                         ptr=optarg;
 246                         while (1) {
 247                                 n_addresses++;
 248                                 if (n_addresses > max_addr) {
 249                                         max_addr *= 2;
 250                                         addresses = realloc (addresses, sizeof(char*) * max_addr);
 251                                         if (addresses == NULL)
 252                                                 die (STATE_UNKNOWN, _("Could not realloc() addresses\n"));
 253                                 }
 254                                 addresses[n_addresses-1] = ptr;
 255                                 if ((ptr = index (ptr, ','))) {
 256                                         strcpy (ptr, "");
 257                                         ptr += sizeof(char);
 258                                 } else {
 259                                         break;
 260                                 }
 261                         }
 262                         break;
 263                 case 'p':       /* number of packets to send */
 264                         if (is_intnonneg (optarg))
 265                                 max_packets = atoi (optarg);
 266                         else
 267                                 usage2 (_("<max_packets> (%s) must be a non-negative number\n"), optarg);
 268                         break;
 269                 case 'n':       /* no HTML */
 270                         display_html = FALSE;
 271                         break;
 272                 case 'L':       /* show HTML */
 273                         display_html = TRUE;
 274                         break;
 275                 case 'c':
 276                         get_threshold (optarg, &crta, &cpl);
 277                         break;
 278                 case 'w':
 279                         get_threshold (optarg, &wrta, &wpl);
 280                         break;
 281                 }
 282         }
 283
 284         c = optind;
 285         if (c == argc)
 286                 return validate_arguments ();
 287
 288         if (addresses[0] == NULL) {
 289                 if (is_host (argv[c]) == FALSE) {
 290                         usage2 (_("Invalid hostname/address"), argv[c]);
 291                 } else {
 292                         addresses[0] = argv[c++];
 293                         n_addresses++;
 294                         if (c == argc)
 295                                 return validate_arguments ();
 296                 }
 297         }
 298
 299         if (wpl == UNKNOWN_PACKET_LOSS) {
 300                 if (is_intpercent (argv[c]) == FALSE) {
 301                         printf (_("<wpl> (%s) must be an integer percentage\n"), argv[c]);
 302                         return ERROR;
 303                 } else {
 304                         wpl = atoi (argv[c++]);
 305                         if (c == argc)
 306                                 return validate_arguments ();
 307                 }
 308         }
 309
 310         if (cpl == UNKNOWN_PACKET_LOSS) {
 311                 if (is_intpercent (argv[c]) == FALSE) {
 312                         printf (_("<cpl> (%s) must be an integer percentage\n"), argv[c]);
 313                         return ERROR;
 314                 } else {
 315                         cpl = atoi (argv[c++]);
 316                         if (c == argc)
 317                                 return validate_arguments ();
 318                 }
 319         }
 320
 321         if (wrta < 0.0) {
 322                 if (is_negative (argv[c])) {
 323                         printf (_("<wrta> (%s) must be a non-negative number\n"), argv[c]);
 324                         return ERROR;
 325                 } else {
 326                         wrta = atof (argv[c++]);
 327                         if (c == argc)
 328                                 return validate_arguments ();
 329                 }
 330         }
 331
 332         if (crta < 0.0) {
 333                 if (is_negative (argv[c])) {
 334                         printf (_("<crta> (%s) must be a non-negative number\n"), argv[c]);
 335                         return ERROR;
 336                 } else {
 337                         crta = atof (argv[c++]);
 338                         if (c == argc)
 339                                 return validate_arguments ();
 340                 }
 341         }
 342
 343         if (max_packets == -1) {
 344                 if (is_intnonneg (argv[c])) {
 345                         max_packets = atoi (argv[c++]);
 346                 } else {
 347                         printf (_("<max_packets> (%s) must be a non-negative number\n"), argv[c]);
 348                         return ERROR;
 349                 }
 350         }
 351
 352         return validate_arguments ();
 353 }
 354
 355
 356
 357 int
 358 get_threshold (char *arg, float *trta, int *tpl)
 359 {
 360         if (is_intnonneg (arg) && sscanf (arg, "%f", trta) == 1)
 361                 return OK;
 362         else if (strpbrk (arg, ",:") && strstr (arg, "%") && sscanf (arg, "%f%*[:,]%d%%", trta, tpl) == 2)
 363                 return OK;
 364         else if (strstr (arg, "%") && sscanf (arg, "%d%%", tpl) == 1)
 365                 return OK;
 366
 367         usage2 (_("%s: Warning threshold must be integer or percentage!\n\n"), arg);
 368         return STATE_UNKNOWN;
 369 }
 370
 371
 372
 373 int
 374 validate_arguments ()
 375 {
 376         float max_seconds;
 377         int i;
 378
 379         if (wrta < 0.0) {
 380                 printf (_("<wrta> was not set\n"));
 381                 return ERROR;
 382         }
 383         else if (crta < 0.0) {
 384                 printf (_("<crta> was not set\n"));
 385                 return ERROR;
 386         }
 387         else if (wpl == UNKNOWN_PACKET_LOSS) {
 388                 printf (_("<wpl> was not set\n"));
 389                 return ERROR;
 390         }
 391         else if (cpl == UNKNOWN_PACKET_LOSS) {
 392                 printf (_("<cpl> was not set\n"));
 393                 return ERROR;
 394         }
 395         else if (wrta > crta) {
 396                 printf (_("<wrta> (%f) cannot be larger than <crta> (%f)\n"), wrta, crta);
 397                 return ERROR;
 398         }
 399         else if (wpl > cpl) {
 400                 printf (_("<wpl> (%d) cannot be larger than <cpl> (%d)\n"), wpl, cpl);
 401                 return ERROR;
 402         }
 403
 404         if (max_packets == -1)
 405                 max_packets = DEFAULT_MAX_PACKETS;
 406
 407         max_seconds = crta / 1000.0 * max_packets + max_packets;
 408         if (max_seconds > timeout_interval)
 409                 timeout_interval = (int)max_seconds;
 410
 411         for (i=0; i<n_addresses; i++) {
 412                 if (is_host(addresses[i]) == FALSE)
 413                         usage2 (_("Invalid hostname/address"), addresses[i]);
 414         }
 415
 416         if (n_addresses == 0) {
 417                 usage (_("You must specify a server address or host name"));
 418         }
 419
 420         return OK;
 421 }
 422
 423
 424
 425 int
 426 run_ping (const char *cmd, const char *addr)
 427 {
 428         char buf[MAX_INPUT_BUFFER];
 429         int result = STATE_UNKNOWN;
 430
 431         if ((child_process = spopen (cmd)) == NULL)
 432                 die (STATE_UNKNOWN, _("Could not open pipe: %s\n"), cmd);
 433
 434         child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
 435         if (child_stderr == NULL)
 436                 printf (_("Cannot open stderr for %s\n"), cmd);
 437
 438         while (fgets (buf, MAX_INPUT_BUFFER - 1, child_process)) {
 439
 440                 if (verbose >= 3)
 441                         printf("Output: %s", buf);
 442
 443                 result = max_state (result, error_scan (buf, addr));
 444
 445                 /* get the percent loss statistics */
 446                 if(sscanf(buf,"%*d packets transmitted, %*d packets received, +%*d errors, %d%% packet loss",&pl)==1 ||
 447                          sscanf(buf,"%*d packets transmitted, %*d packets received, +%*d duplicates, %d%% packet loss", &pl) == 1 ||
 448                          sscanf(buf,"%*d packets transmitted, %*d received, +%*d duplicates, %d%% packet loss", &pl) == 1 ||
 449                          sscanf(buf,"%*d packets transmitted, %*d packets received, %d%% packet loss",&pl)==1 ||
 450                          sscanf(buf,"%*d packets transmitted, %*d packets received, %d%% loss, time",&pl)==1 ||
 451                          sscanf(buf,"%*d packets transmitted, %*d received, %d%% loss, time", &pl)==1 ||
 452                          sscanf(buf,"%*d packets transmitted, %*d received, %d%% packet loss, time", &pl)==1 ||
 453                          sscanf(buf,"%*d packets transmitted, %*d received, +%*d errors, %d%% packet loss", &pl) == 1 ||
 454                          sscanf(buf,"%*d packets transmitted %*d received, +%*d errors, %d%% packet loss", &pl) == 1
 455                          )
 456                         continue;
 457
 458                 /* get the round trip average */
 459                 else
 460                         if(sscanf(buf,"round-trip min/avg/max = %*f/%f/%*f",&rta)==1 ||
 461                                  sscanf(buf,"round-trip min/avg/max/mdev = %*f/%f/%*f/%*f",&rta)==1 ||
 462                                  sscanf(buf,"round-trip min/avg/max/sdev = %*f/%f/%*f/%*f",&rta)==1 ||
 463                                  sscanf(buf,"round-trip min/avg/max/stddev = %*f/%f/%*f/%*f",&rta)==1 ||
 464                                  sscanf(buf,"round-trip min/avg/max/std-dev = %*f/%f/%*f/%*f",&rta)==1 ||
 465                                  sscanf(buf,"round-trip (ms) min/avg/max = %*f/%f/%*f",&rta)==1 ||
 466                                  sscanf(buf,"round-trip (ms) min/avg/max/stddev = %*f/%f/%*f/%*f",&rta)==1 ||
 467                                  sscanf(buf,"rtt min/avg/max/mdev = %*f/%f/%*f/%*f ms",&rta)==1)
 468                         continue;
 469         }
 470
 471         /* this is needed because there is no rta if all packets are lost */
 472         if (pl == 100)
 473                 rta = crta;
 474
 475         /* check stderr, setting at least WARNING if there is output here */
 476         /* Add warning into warn_text */
 477         while (fgets (buf, MAX_INPUT_BUFFER - 1, child_stderr)) {
 478                 if (! strstr(buf,"WARNING - no SO_TIMESTAMP support, falling back to SIOCGSTAMP")) {
 479                         if (verbose >= 3) {
 480                                 printf("Got stderr: %s", buf);
 481                         }
 482                         if ((result=error_scan(buf, addr)) == STATE_OK) {
 483                                 result = STATE_WARNING;
 484                                 if (warn_text == NULL) {
 485                                         warn_text = strdup(_("System call sent warnings to stderr "));
 486                                 } else {
 487                                         asprintf(&warn_text, "%s %s", warn_text, _("System call sent warnings to stderr "));
 488                                 }
 489                         }
 490                 }
 491         }
 492
 493         (void) fclose (child_stderr);
 494
 495
 496         /* close the pipe - WARNING if status is set */
 497         if (spclose (child_process))
 498                 result = max_state (result, STATE_WARNING);
 499
 500         if (warn_text == NULL)
 501                 warn_text = strdup("");
 502
 503         return result;
 504 }
 505
 506
 507
 508 int
 509 error_scan (char buf[MAX_INPUT_BUFFER], const char *addr)
 510 {
 511         if (strstr (buf, "Network is unreachable") ||
 512                 strstr (buf, "Destination Net Unreachable")
 513                 )
 514                 die (STATE_CRITICAL, _("CRITICAL - Network Unreachable (%s)"), addr);
 515         else if (strstr (buf, "Destination Host Unreachable"))
 516                 die (STATE_CRITICAL, _("CRITICAL - Host Unreachable (%s)"), addr);
 517         else if (strstr (buf, "Destination Port Unreachable"))
 518                 die (STATE_CRITICAL, _("CRITICAL - Bogus ICMP: Port Unreachable (%s)"), addr);
 519         else if (strstr (buf, "Destination Protocol Unreachable"))
 520                 die (STATE_CRITICAL, _("CRITICAL - Bogus ICMP: Protocol Unreachable (%s)"), addr);
 521         else if (strstr (buf, "Destination Net Prohibited"))
 522                 die (STATE_CRITICAL, _("CRITICAL - Network Prohibited (%s)"), addr);
 523         else if (strstr (buf, "Destination Host Prohibited"))
 524                 die (STATE_CRITICAL, _("CRITICAL - Host Prohibited (%s)"), addr);
 525         else if (strstr (buf, "Packet filtered"))
 526                 die (STATE_CRITICAL, _("CRITICAL - Packet Filtered (%s)"), addr);
 527         else if (strstr (buf, "unknown host" ))
 528                 die (STATE_CRITICAL, _("CRITICAL - Host not found (%s)"), addr);
 529         else if (strstr (buf, "Time to live exceeded"))
 530                 die (STATE_CRITICAL, _("CRITICAL - Time to live exceeded (%s)"), addr);
 531
 532         if (strstr (buf, "(DUP!)") || strstr (buf, "DUPLICATES FOUND")) {
 533                 if (warn_text == NULL)
 534                         warn_text = strdup (_(WARN_DUPLICATES));
 535                 else if (! strstr (warn_text, _(WARN_DUPLICATES)) &&
 536                          asprintf (&warn_text, "%s %s", warn_text, _(WARN_DUPLICATES)) == -1)
 537                         die (STATE_UNKNOWN, _("Unable to realloc warn_text"));
 538                 return (STATE_WARNING);
 539         }
 540
 541         return (STATE_OK);
 542 }
 543
 544
 545
 546 void
 547 print_help (void)
 548 {
 549         print_revision (progname, revision);
 550
 551         printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>");
 552         printf (COPYRIGHT, copyright, email);
 553
 554         printf (_("Use ping to check connection statistics for a remote host."));
 555
 556   printf ("\n\n");
 557
 558         print_usage ();
 559
 560         printf (_(UT_HELP_VRSN));
 561
 562         printf (_(UT_IPv46));
 563
 564         printf (" %s\n", "-H, --hostname=HOST");
 565   printf ("    %s\n", _("host to ping"));
 566   printf (" %s\n", "-w, --warning=THRESHOLD");
 567   printf ("    %s\n", _("warning threshold pair"));
 568   printf (" %s\n", "-c, --critical=THRESHOLD");
 569   printf ("    %s\n", _("critical threshold pair"));
 570   printf (" %s\n", "-p, --packets=INTEGER");
 571   printf ("    %s ", _("number of ICMP ECHO packets to send"));
 572   printf (_("(Default: %d)\n"), DEFAULT_MAX_PACKETS);
 573   printf (" %s\n", "-L, --link");
 574   printf ("    %s\n", _("show HTML in the plugin output (obsoleted by urlize)"));
 575
 576         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 577
 578         printf ("%s\n", _("THRESHOLD is <rta>,<pl>% where <rta> is the round trip average travel"));
 579   printf ("%s\n", _("time (ms) which triggers a WARNING or CRITICAL state, and <pl> is the"));
 580   printf ("%s\n", _("percentage of packet loss to trigger an alarm state."));
 581
 582   printf ("\n\n");
 583
 584         printf ("%s\n", _("This plugin uses the ping command to probe the specified host for packet loss"));
 585   printf ("%s\n", _("(percentage) and round trip average (milliseconds). It can produce HTML output"));
 586   printf ("%s\n", _("linking to a traceroute CGI contributed by Ian Cass. The CGI can be found in"));
 587   printf ("%s\n", _("the contrib area of the downloads section at http://www.nagios.org/"));
 588
 589   printf ("\n\n");
 590
 591         printf (_(UT_SUPPORT));
 592 }
 593
 594 void
 595 print_usage (void)
 596 {
 597   printf (_("Usage:"));
 598         printf ("%s -H <host_address> -w <wrta>,<wpl>%% -c <crta>,<cpl>%%\n", progname);
 599   printf (" [-p packets] [-t timeout] [-4|-6]\n");
 600 }