plugins/check_ping.c

   1 /*****************************************************************************
   2 *
   3 * Nagios check_ping 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_ping plugin
  13 *
  14 * Use the ping program to check connection statistics for a remote 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_ping";
  35 const char *revision = "$Revision$";
  36 const char *copyright = "2000-2007";
  37 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  38
  39 #include "common.h"
  40 #include "netutils.h"
  41 #include "popen.h"
  42 #include "utils.h"
  43
  44 #define WARN_DUPLICATES "DUPLICATES FOUND! "
  45 #define UNKNOWN_TRIP_TIME -1.0  /* -1 seconds */
  46
  47 enum {
  48         UNKNOWN_PACKET_LOSS = 200,    /* 200% */
  49         DEFAULT_MAX_PACKETS = 5       /* default no. of ICMP ECHO packets */
  50 };
  51
  52 int process_arguments (int, char **);
  53 int get_threshold (char *, float *, int *);
  54 int validate_arguments (void);
  55 int run_ping (const char *cmd, const char *addr);
  56 int error_scan (char buf[MAX_INPUT_BUFFER], const char *addr);
  57 void print_usage (void);
  58 void print_help (void);
  59
  60 int display_html = FALSE;
  61 int wpl = UNKNOWN_PACKET_LOSS;
  62 int cpl = UNKNOWN_PACKET_LOSS;
  63 float wrta = UNKNOWN_TRIP_TIME;
  64 float crta = UNKNOWN_TRIP_TIME;
  65 char **addresses = NULL;
  66 int n_addresses = 0;
  67 int max_addr = 1;
  68 int max_packets = -1;
  69 int verbose = 0;
  70
  71 float rta = UNKNOWN_TRIP_TIME;
  72 int pl = UNKNOWN_PACKET_LOSS;
  73
  74 char *warn_text;
  75
  76
  77
  78 int
  79 main (int argc, char **argv)
  80 {
  81         char *cmd = NULL;
  82         char *rawcmd = NULL;
  83         int result = STATE_UNKNOWN;
  84         int this_result = STATE_UNKNOWN;
  85         int i;
  86
  87         setlocale (LC_ALL, "");
  88         setlocale (LC_NUMERIC, "C");
  89         bindtextdomain (PACKAGE, LOCALEDIR);
  90         textdomain (PACKAGE);
  91
  92         addresses = malloc (sizeof(char*) * max_addr);
  93         addresses[0] = NULL;
  94
  95         if (process_arguments (argc, argv) == ERROR)
  96                 usage4 (_("Could not parse arguments"));
  97
  98         /* Set signal handling and alarm */
  99         if (signal (SIGALRM, popen_timeout_alarm_handler) == SIG_ERR) {
 100                 usage4 (_("Cannot catch SIGALRM"));
 101         }
 102
 103         /* If ./configure finds ping has timeout values, set plugin alarm slightly
 104          * higher so that we can use response from command line ping */
 105 #if defined(PING_PACKETS_FIRST) && defined(PING_HAS_TIMEOUT)
 106         alarm (timeout_interval + 1);
 107 #else
 108         alarm (timeout_interval);
 109 #endif
 110
 111         for (i = 0 ; i < n_addresses ; i++) {
 112
 113 #ifdef PING6_COMMAND
 114                 if (address_family != AF_INET && is_inet6_addr(addresses[i]))
 115                         rawcmd = strdup(PING6_COMMAND);
 116                 else
 117                         rawcmd = strdup(PING_COMMAND);
 118 #else
 119                 rawcmd = strdup(PING_COMMAND);
 120 #endif
 121
 122                 /* does the host address of number of packets argument come first? */
 123 #ifdef PING_PACKETS_FIRST
 124 # ifdef PING_HAS_TIMEOUT
 125                 asprintf (&cmd, rawcmd, timeout_interval, max_packets, addresses[i]);
 126 # else
 127                 asprintf (&cmd, rawcmd, max_packets, addresses[i]);
 128 # endif
 129 #else
 130                 asprintf (&cmd, rawcmd, addresses[i], max_packets);
 131 #endif
 132
 133                 if (verbose >= 2)
 134                         printf ("CMD: %s\n", cmd);
 135
 136                 /* run the command */
 137                 this_result = run_ping (cmd, addresses[i]);
 138
 139                 if (pl == UNKNOWN_PACKET_LOSS || rta < 0.0) {
 140                         printf ("%s\n", cmd);
 141                         die (STATE_UNKNOWN,
 142                                    _("CRITICAL - Could not interpret output from ping command\n"));
 143                 }
 144
 145                 if (pl >= cpl || rta >= crta || rta < 0)
 146                         this_result = STATE_CRITICAL;
 147                 else if (pl >= wpl || rta >= wrta)
 148                         this_result = STATE_WARNING;
 149                 else if (pl >= 0 && rta >= 0)
 150                         this_result = max_state (STATE_OK, this_result);
 151
 152                 if (n_addresses > 1 && this_result != STATE_UNKNOWN)
 153                         die (STATE_OK, "%s is alive\n", addresses[i]);
 154
 155                 if (display_html == TRUE)
 156                         printf ("<A HREF='%s/traceroute.cgi?%s'>", CGIURL, addresses[i]);
 157                 if (pl == 100)
 158                         printf (_("PING %s - %sPacket loss = %d%%"), state_text (this_result), warn_text,
 159                                                         pl);
 160                 else
 161                         printf (_("PING %s - %sPacket loss = %d%%, RTA = %2.2f ms"),
 162                                                         state_text (this_result), warn_text, pl, rta);
 163                 if (display_html == TRUE)
 164                         printf ("</A>");
 165                 printf ("\n");
 166
 167                 if (verbose >= 2)
 168                         printf ("%f:%d%% %f:%d%%\n", wrta, wpl, crta, cpl);
 169
 170                 result = max_state (result, this_result);
 171                 free (rawcmd);
 172                 free (cmd);
 173         }
 174
 175         return result;
 176 }
 177
 178
 179
 180 /* process command-line arguments */
 181 int
 182 process_arguments (int argc, char **argv)
 183 {
 184         int c = 1;
 185         char *ptr;
 186
 187         int option = 0;
 188         static struct option longopts[] = {
 189                 STD_LONG_OPTS,
 190                 {"packets", required_argument, 0, 'p'},
 191                 {"nohtml", no_argument, 0, 'n'},
 192                 {"link", no_argument, 0, 'L'},
 193                 {"use-ipv4", no_argument, 0, '4'},
 194                 {"use-ipv6", no_argument, 0, '6'},
 195                 {0, 0, 0, 0}
 196         };
 197
 198         if (argc < 2)
 199                 return ERROR;
 200
 201         for (c = 1; c < argc; c++) {
 202                 if (strcmp ("-to", argv[c]) == 0)
 203                         strcpy (argv[c], "-t");
 204                 if (strcmp ("-nohtml", argv[c]) == 0)
 205                         strcpy (argv[c], "-n");
 206         }
 207
 208         while (1) {
 209                 c = getopt_long (argc, argv, "VvhnL46t:c:w:H:p:", longopts, &option);
 210
 211                 if (c == -1 || c == EOF)
 212                         break;
 213
 214                 switch (c) {
 215                 case '?':       /* usage */
 216                         usage5 ();
 217                 case 'h':       /* help */
 218                         print_help ();
 219                         exit (STATE_OK);
 220                         break;
 221                 case 'V':       /* version */
 222                         print_revision (progname, revision);
 223                         exit (STATE_OK);
 224                         break;
 225                 case 't':       /* timeout period */
 226                         timeout_interval = atoi (optarg);
 227                         break;
 228                 case 'v':       /* verbose mode */
 229                         verbose++;
 230                         break;
 231                 case '4':       /* IPv4 only */
 232                         address_family = AF_INET;
 233                         break;
 234                 case '6':       /* IPv6 only */
 235 #ifdef USE_IPV6
 236                         address_family = AF_INET6;
 237 #else
 238                         usage (_("IPv6 support not available\n"));
 239 #endif
 240                         break;
 241                 case 'H':       /* hostname */
 242                         ptr=optarg;
 243                         while (1) {
 244                                 n_addresses++;
 245                                 if (n_addresses > max_addr) {
 246                                         max_addr *= 2;
 247                                         addresses = realloc (addresses, sizeof(char*) * max_addr);
 248                                         if (addresses == NULL)
 249                                                 die (STATE_UNKNOWN, _("Could not realloc() addresses\n"));
 250                                 }
 251                                 addresses[n_addresses-1] = ptr;
 252                                 if ((ptr = index (ptr, ','))) {
 253                                         strcpy (ptr, "");
 254                                         ptr += sizeof(char);
 255                                 } else {
 256                                         break;
 257                                 }
 258                         }
 259                         break;
 260                 case 'p':       /* number of packets to send */
 261                         if (is_intnonneg (optarg))
 262                                 max_packets = atoi (optarg);
 263                         else
 264                                 usage2 (_("<max_packets> (%s) must be a non-negative number\n"), optarg);
 265                         break;
 266                 case 'n':       /* no HTML */
 267                         display_html = FALSE;
 268                         break;
 269                 case 'L':       /* show HTML */
 270                         display_html = TRUE;
 271                         break;
 272                 case 'c':
 273                         get_threshold (optarg, &crta, &cpl);
 274                         break;
 275                 case 'w':
 276                         get_threshold (optarg, &wrta, &wpl);
 277                         break;
 278                 }
 279         }
 280
 281         c = optind;
 282         if (c == argc)
 283                 return validate_arguments ();
 284
 285         if (addresses[0] == NULL) {
 286                 if (is_host (argv[c]) == FALSE) {
 287                         usage2 (_("Invalid hostname/address"), argv[c]);
 288                 } else {
 289                         addresses[0] = argv[c++];
 290                         n_addresses++;
 291                         if (c == argc)
 292                                 return validate_arguments ();
 293                 }
 294         }
 295
 296         if (wpl == UNKNOWN_PACKET_LOSS) {
 297                 if (is_intpercent (argv[c]) == FALSE) {
 298                         printf (_("<wpl> (%s) must be an integer percentage\n"), argv[c]);
 299                         return ERROR;
 300                 } else {
 301                         wpl = atoi (argv[c++]);
 302                         if (c == argc)
 303                                 return validate_arguments ();
 304                 }
 305         }
 306
 307         if (cpl == UNKNOWN_PACKET_LOSS) {
 308                 if (is_intpercent (argv[c]) == FALSE) {
 309                         printf (_("<cpl> (%s) must be an integer percentage\n"), argv[c]);
 310                         return ERROR;
 311                 } else {
 312                         cpl = atoi (argv[c++]);
 313                         if (c == argc)
 314                                 return validate_arguments ();
 315                 }
 316         }
 317
 318         if (wrta < 0.0) {
 319                 if (is_negative (argv[c])) {
 320                         printf (_("<wrta> (%s) must be a non-negative number\n"), argv[c]);
 321                         return ERROR;
 322                 } else {
 323                         wrta = atof (argv[c++]);
 324                         if (c == argc)
 325                                 return validate_arguments ();
 326                 }
 327         }
 328
 329         if (crta < 0.0) {
 330                 if (is_negative (argv[c])) {
 331                         printf (_("<crta> (%s) must be a non-negative number\n"), argv[c]);
 332                         return ERROR;
 333                 } else {
 334                         crta = atof (argv[c++]);
 335                         if (c == argc)
 336                                 return validate_arguments ();
 337                 }
 338         }
 339
 340         if (max_packets == -1) {
 341                 if (is_intnonneg (argv[c])) {
 342                         max_packets = atoi (argv[c++]);
 343                 } else {
 344                         printf (_("<max_packets> (%s) must be a non-negative number\n"), argv[c]);
 345                         return ERROR;
 346                 }
 347         }
 348
 349         return validate_arguments ();
 350 }
 351
 352
 353
 354 int
 355 get_threshold (char *arg, float *trta, int *tpl)
 356 {
 357         if (is_intnonneg (arg) && sscanf (arg, "%f", trta) == 1)
 358                 return OK;
 359         else if (strpbrk (arg, ",:") && strstr (arg, "%") && sscanf (arg, "%f%*[:,]%d%%", trta, tpl) == 2)
 360                 return OK;
 361         else if (strstr (arg, "%") && sscanf (arg, "%d%%", tpl) == 1)
 362                 return OK;
 363
 364         usage2 (_("%s: Warning threshold must be integer or percentage!\n\n"), arg);
 365         return STATE_UNKNOWN;
 366 }
 367
 368
 369
 370 int
 371 validate_arguments ()
 372 {
 373         float max_seconds;
 374         int i;
 375
 376         if (wrta < 0.0) {
 377                 printf (_("<wrta> was not set\n"));
 378                 return ERROR;
 379         }
 380         else if (crta < 0.0) {
 381                 printf (_("<crta> was not set\n"));
 382                 return ERROR;
 383         }
 384         else if (wpl == UNKNOWN_PACKET_LOSS) {
 385                 printf (_("<wpl> was not set\n"));
 386                 return ERROR;
 387         }
 388         else if (cpl == UNKNOWN_PACKET_LOSS) {
 389                 printf (_("<cpl> was not set\n"));
 390                 return ERROR;
 391         }
 392         else if (wrta > crta) {
 393                 printf (_("<wrta> (%f) cannot be larger than <crta> (%f)\n"), wrta, crta);
 394                 return ERROR;
 395         }
 396         else if (wpl > cpl) {
 397                 printf (_("<wpl> (%d) cannot be larger than <cpl> (%d)\n"), wpl, cpl);
 398                 return ERROR;
 399         }
 400
 401         if (max_packets == -1)
 402                 max_packets = DEFAULT_MAX_PACKETS;
 403
 404         max_seconds = crta / 1000.0 * max_packets + max_packets;
 405         if (max_seconds > timeout_interval)
 406                 timeout_interval = (int)max_seconds;
 407
 408         for (i=0; i<n_addresses; i++) {
 409                 if (is_host(addresses[i]) == FALSE)
 410                         usage2 (_("Invalid hostname/address"), addresses[i]);
 411         }
 412
 413         if (n_addresses == 0) {
 414                 usage (_("You must specify a server address or host name"));
 415         }
 416
 417         return OK;
 418 }
 419
 420
 421
 422 int
 423 run_ping (const char *cmd, const char *addr)
 424 {
 425         char buf[MAX_INPUT_BUFFER];
 426         int result = STATE_UNKNOWN;
 427
 428         if ((child_process = spopen (cmd)) == NULL)
 429                 die (STATE_UNKNOWN, _("Could not open pipe: %s\n"), cmd);
 430
 431         child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
 432         if (child_stderr == NULL)
 433                 printf (_("Cannot open stderr for %s\n"), cmd);
 434
 435         while (fgets (buf, MAX_INPUT_BUFFER - 1, child_process)) {
 436
 437                 if (verbose >= 3)
 438                         printf("Output: %s", buf);
 439
 440                 result = max_state (result, error_scan (buf, addr));
 441
 442                 /* get the percent loss statistics */
 443                 if(sscanf(buf,"%*d packets transmitted, %*d packets received, +%*d errors, %d%% packet loss",&pl)==1 ||
 444                          sscanf(buf,"%*d packets transmitted, %*d packets received, +%*d duplicates, %d%% packet loss", &pl) == 1 ||
 445                          sscanf(buf,"%*d packets transmitted, %*d received, +%*d duplicates, %d%% packet loss", &pl) == 1 ||
 446                          sscanf(buf,"%*d packets transmitted, %*d packets received, %d%% packet loss",&pl)==1 ||
 447                          sscanf(buf,"%*d packets transmitted, %*d packets received, %d%% loss, time",&pl)==1 ||
 448                          sscanf(buf,"%*d packets transmitted, %*d received, %d%% loss, time", &pl)==1 ||
 449                          sscanf(buf,"%*d packets transmitted, %*d received, %d%% packet loss, time", &pl)==1 ||
 450                          sscanf(buf,"%*d packets transmitted, %*d received, +%*d errors, %d%% packet loss", &pl) == 1 ||
 451                          sscanf(buf,"%*d packets transmitted %*d received, +%*d errors, %d%% packet loss", &pl) == 1
 452                          )
 453                         continue;
 454
 455                 /* get the round trip average */
 456                 else
 457                         if(sscanf(buf,"round-trip min/avg/max = %*f/%f/%*f",&rta)==1 ||
 458                                  sscanf(buf,"round-trip min/avg/max/mdev = %*f/%f/%*f/%*f",&rta)==1 ||
 459                                  sscanf(buf,"round-trip min/avg/max/sdev = %*f/%f/%*f/%*f",&rta)==1 ||
 460                                  sscanf(buf,"round-trip min/avg/max/stddev = %*f/%f/%*f/%*f",&rta)==1 ||
 461                                  sscanf(buf,"round-trip min/avg/max/std-dev = %*f/%f/%*f/%*f",&rta)==1 ||
 462                                  sscanf(buf,"round-trip (ms) min/avg/max = %*f/%f/%*f",&rta)==1 ||
 463                                  sscanf(buf,"round-trip (ms) min/avg/max/stddev = %*f/%f/%*f/%*f",&rta)==1 ||
 464                                  sscanf(buf,"rtt min/avg/max/mdev = %*f/%f/%*f/%*f ms",&rta)==1)
 465                         continue;
 466         }
 467
 468         /* this is needed because there is no rta if all packets are lost */
 469         if (pl == 100)
 470                 rta = crta;
 471
 472         /* check stderr, setting at least WARNING if there is output here */
 473         /* Add warning into warn_text */
 474         while (fgets (buf, MAX_INPUT_BUFFER - 1, child_stderr)) {
 475                 if (! strstr(buf,"WARNING - no SO_TIMESTAMP support, falling back to SIOCGSTAMP")) {
 476                         if (verbose >= 3) {
 477                                 printf("Got stderr: %s", buf);
 478                         }
 479                         if ((result=error_scan(buf, addr)) == STATE_OK) {
 480                                 result = STATE_WARNING;
 481                                 if (warn_text == NULL) {
 482                                         warn_text = strdup(_("System call sent warnings to stderr "));
 483                                 } else {
 484                                         asprintf(&warn_text, "%s %s", warn_text, _("System call sent warnings to stderr "));
 485                                 }
 486                         }
 487                 }
 488         }
 489
 490         (void) fclose (child_stderr);
 491
 492
 493         /* close the pipe - WARNING if status is set */
 494         if (spclose (child_process))
 495                 result = max_state (result, STATE_WARNING);
 496
 497         if (warn_text == NULL)
 498                 warn_text = strdup("");
 499
 500         return result;
 501 }
 502
 503
 504
 505 int
 506 error_scan (char buf[MAX_INPUT_BUFFER], const char *addr)
 507 {
 508         if (strstr (buf, "Network is unreachable") ||
 509                 strstr (buf, "Destination Net Unreachable")
 510                 )
 511                 die (STATE_CRITICAL, _("CRITICAL - Network Unreachable (%s)"), addr);
 512         else if (strstr (buf, "Destination Host Unreachable"))
 513                 die (STATE_CRITICAL, _("CRITICAL - Host Unreachable (%s)"), addr);
 514         else if (strstr (buf, "Destination Port Unreachable"))
 515                 die (STATE_CRITICAL, _("CRITICAL - Bogus ICMP: Port Unreachable (%s)"), addr);
 516         else if (strstr (buf, "Destination Protocol Unreachable"))
 517                 die (STATE_CRITICAL, _("CRITICAL - Bogus ICMP: Protocol Unreachable (%s)"), addr);
 518         else if (strstr (buf, "Destination Net Prohibited"))
 519                 die (STATE_CRITICAL, _("CRITICAL - Network Prohibited (%s)"), addr);
 520         else if (strstr (buf, "Destination Host Prohibited"))
 521                 die (STATE_CRITICAL, _("CRITICAL - Host Prohibited (%s)"), addr);
 522         else if (strstr (buf, "Packet filtered"))
 523                 die (STATE_CRITICAL, _("CRITICAL - Packet Filtered (%s)"), addr);
 524         else if (strstr (buf, "unknown host" ))
 525                 die (STATE_CRITICAL, _("CRITICAL - Host not found (%s)"), addr);
 526         else if (strstr (buf, "Time to live exceeded"))
 527                 die (STATE_CRITICAL, _("CRITICAL - Time to live exceeded (%s)"), addr);
 528
 529         if (strstr (buf, "(DUP!)") || strstr (buf, "DUPLICATES FOUND")) {
 530                 if (warn_text == NULL)
 531                         warn_text = strdup (_(WARN_DUPLICATES));
 532                 else if (! strstr (warn_text, _(WARN_DUPLICATES)) &&
 533                          asprintf (&warn_text, "%s %s", warn_text, _(WARN_DUPLICATES)) == -1)
 534                         die (STATE_UNKNOWN, _("Unable to realloc warn_text"));
 535                 return (STATE_WARNING);
 536         }
 537
 538         return (STATE_OK);
 539 }
 540
 541
 542
 543 void
 544 print_help (void)
 545 {
 546         print_revision (progname, revision);
 547
 548         printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
 549         printf (COPYRIGHT, copyright, email);
 550
 551         printf (_("Use ping to check connection statistics for a remote host."));
 552
 553   printf ("\n\n");
 554
 555         print_usage ();
 556
 557         printf (_(UT_HELP_VRSN));
 558
 559         printf (_(UT_IPv46));
 560
 561         printf (" %s\n", "-H, --hostname=HOST");
 562   printf ("    %s\n", _("host to ping"));
 563   printf (" %s\n", "-w, --warning=THRESHOLD");
 564   printf ("    %s\n", _("warning threshold pair"));
 565   printf (" %s\n", "-c, --critical=THRESHOLD");
 566   printf ("    %s\n", _("critical threshold pair"));
 567   printf (" %s\n", "-p, --packets=INTEGER");
 568   printf ("    %s ", _("number of ICMP ECHO packets to send"));
 569   printf (_("(Default: %d)\n"), DEFAULT_MAX_PACKETS);
 570   printf (" %s\n", "-L, --link");
 571   printf ("    %s\n", _("show HTML in the plugin output (obsoleted by urlize)"));
 572
 573         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 574
 575         printf ("%s\n", _("THRESHOLD is <rta>,<pl>% where <rta> is the round trip average travel"));
 576   printf ("%s\n", _("time (ms) which triggers a WARNING or CRITICAL state, and <pl> is the"));
 577   printf ("%s\n", _("percentage of packet loss to trigger an alarm state."));
 578
 579   printf ("\n\n");
 580
 581         printf ("%s\n", _("This plugin uses the ping command to probe the specified host for packet loss"));
 582   printf ("%s\n", _("(percentage) and round trip average (milliseconds). It can produce HTML output"));
 583   printf ("%s\n", _("linking to a traceroute CGI contributed by Ian Cass. The CGI can be found in"));
 584   printf ("%s\n", _("the contrib area of the downloads section at http://www.nagios.org/"));
 585
 586   printf ("\n\n");
 587
 588         printf (_(UT_SUPPORT));
 589 }
 590
 591 void
 592 print_usage (void)
 593 {
 594   printf (_("Usage:"));
 595         printf ("%s -H <host_address> -w <wrta>,<wpl>%% -c <crta>,<cpl>%%\n", progname);
 596   printf (" [-p packets] [-t timeout] [-4|-6]\n");
 597 }