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 * Description:
   9 *
  10 * This file contains the check_ping plugin
  11 *
  12 * Use the ping program to check connection statistics for a remote 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_ping";
  32 const char *copyright = "2000-2007";
  33 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  34
  35 #include "common.h"
  36 #include "netutils.h"
  37 #include "popen.h"
  38 #include "utils.h"
  39
  40 #define WARN_DUPLICATES "DUPLICATES FOUND! "
  41 #define UNKNOWN_TRIP_TIME -1.0  /* -1 seconds */
  42
  43 enum {
  44         UNKNOWN_PACKET_LOSS = 200,    /* 200% */
  45         DEFAULT_MAX_PACKETS = 5       /* default no. of ICMP ECHO packets */
  46 };
  47
  48 int process_arguments (int, char **);
  49 int get_threshold (char *, float *, int *);
  50 int validate_arguments (void);
  51 int run_ping (const char *cmd, const char *addr);
  52 int error_scan (char buf[MAX_INPUT_BUFFER], const char *addr);
  53 void print_usage (void);
  54 void print_help (void);
  55
  56 int display_html = FALSE;
  57 int wpl = UNKNOWN_PACKET_LOSS;
  58 int cpl = UNKNOWN_PACKET_LOSS;
  59 float wrta = UNKNOWN_TRIP_TIME;
  60 float crta = UNKNOWN_TRIP_TIME;
  61 char **addresses = NULL;
  62 int n_addresses = 0;
  63 int max_addr = 1;
  64 int max_packets = -1;
  65 int verbose = 0;
  66
  67 float rta = UNKNOWN_TRIP_TIME;
  68 int pl = UNKNOWN_PACKET_LOSS;
  69
  70 char *warn_text;
  71
  72
  73
  74 int
  75 main (int argc, char **argv)
  76 {
  77         char *cmd = NULL;
  78         char *rawcmd = NULL;
  79         int result = STATE_UNKNOWN;
  80         int this_result = STATE_UNKNOWN;
  81         int i;
  82
  83         setlocale (LC_ALL, "");
  84         setlocale (LC_NUMERIC, "C");
  85         bindtextdomain (PACKAGE, LOCALEDIR);
  86         textdomain (PACKAGE);
  87
  88         addresses = malloc (sizeof(char*) * max_addr);
  89         addresses[0] = NULL;
  90
  91         /* Parse extra opts if any */
  92         argv=np_extra_opts (&argc, argv, progname);
  93
  94         if (process_arguments (argc, argv) == ERROR)
  95                 usage4 (_("Could not parse arguments"));
  96
  97         /* Set signal handling and alarm */
  98         if (signal (SIGALRM, popen_timeout_alarm_handler) == SIG_ERR) {
  99                 usage4 (_("Cannot catch SIGALRM"));
 100         }
 101
 102         /* If ./configure finds ping has timeout values, set plugin alarm slightly
 103          * higher so that we can use response from command line ping */
 104 #if defined(PING_PACKETS_FIRST) && defined(PING_HAS_TIMEOUT)
 105         alarm (timeout_interval + 1);
 106 #else
 107         alarm (timeout_interval);
 108 #endif
 109
 110         for (i = 0 ; i < n_addresses ; i++) {
 111
 112 #ifdef PING6_COMMAND
 113                 if (address_family != AF_INET && is_inet6_addr(addresses[i]))
 114                         rawcmd = strdup(PING6_COMMAND);
 115                 else
 116                         rawcmd = strdup(PING_COMMAND);
 117 #else
 118                 rawcmd = strdup(PING_COMMAND);
 119 #endif
 120
 121                 /* does the host address of number of packets argument come first? */
 122 #ifdef PING_PACKETS_FIRST
 123 # ifdef PING_HAS_TIMEOUT
 124                 asprintf (&cmd, rawcmd, timeout_interval, max_packets, addresses[i]);
 125 # else
 126                 asprintf (&cmd, rawcmd, max_packets, addresses[i]);
 127 # endif
 128 #else
 129                 asprintf (&cmd, rawcmd, addresses[i], max_packets);
 130 #endif
 131
 132                 if (verbose >= 2)
 133                         printf ("CMD: %s\n", cmd);
 134
 135                 /* run the command */
 136                 this_result = run_ping (cmd, addresses[i]);
 137
 138                 if (pl == UNKNOWN_PACKET_LOSS || rta < 0.0) {
 139                         printf ("%s\n", cmd);
 140                         die (STATE_UNKNOWN,
 141                                    _("CRITICAL - Could not interpret output from ping command\n"));
 142                 }
 143
 144                 if (pl >= cpl || rta >= crta || rta < 0)
 145                         this_result = STATE_CRITICAL;
 146                 else if (pl >= wpl || rta >= wrta)
 147                         this_result = STATE_WARNING;
 148                 else if (pl >= 0 && rta >= 0)
 149                         this_result = max_state (STATE_OK, this_result);
 150
 151                 if (n_addresses > 1 && this_result != STATE_UNKNOWN)
 152                         die (STATE_OK, "%s is alive\n", addresses[i]);
 153
 154                 if (display_html == TRUE)
 155                         printf ("<A HREF='%s/traceroute.cgi?%s'>", CGIURL, addresses[i]);
 156                 if (pl == 100)
 157                         printf (_("PING %s - %sPacket loss = %d%%"), state_text (this_result), warn_text,
 158                                                         pl);
 159                 else
 160                         printf (_("PING %s - %sPacket loss = %d%%, RTA = %2.2f ms"),
 161                                                         state_text (this_result), warn_text, pl, rta);
 162                 if (display_html == TRUE)
 163                         printf ("</A>");
 164
 165                 /* Print performance data */
 166                 printf("|%s", fperfdata ("rta", (double) rta, "ms",
 167                                           wrta>0?TRUE:FALSE, wrta,
 168                                           crta>0?TRUE:FALSE, crta,
 169                                           TRUE, 0, FALSE, 0));
 170                 printf(" %s\n", perfdata ("pl", (long) pl, "%",
 171                                           wpl>0?TRUE:FALSE, wpl,
 172                                           cpl>0?TRUE:FALSE, cpl,
 173                                           TRUE, 0, FALSE, 0));
 174
 175                 if (verbose >= 2)
 176                         printf ("%f:%d%% %f:%d%%\n", wrta, wpl, crta, cpl);
 177
 178                 result = max_state (result, this_result);
 179                 free (rawcmd);
 180                 free (cmd);
 181         }
 182
 183         return result;
 184 }
 185
 186
 187
 188 /* process command-line arguments */
 189 int
 190 process_arguments (int argc, char **argv)
 191 {
 192         int c = 1;
 193         char *ptr;
 194
 195         int option = 0;
 196         static struct option longopts[] = {
 197                 STD_LONG_OPTS,
 198                 {"packets", required_argument, 0, 'p'},
 199                 {"nohtml", no_argument, 0, 'n'},
 200                 {"link", no_argument, 0, 'L'},
 201                 {"use-ipv4", no_argument, 0, '4'},
 202                 {"use-ipv6", no_argument, 0, '6'},
 203                 {0, 0, 0, 0}
 204         };
 205
 206         if (argc < 2)
 207                 return ERROR;
 208
 209         for (c = 1; c < argc; c++) {
 210                 if (strcmp ("-to", argv[c]) == 0)
 211                         strcpy (argv[c], "-t");
 212                 if (strcmp ("-nohtml", argv[c]) == 0)
 213                         strcpy (argv[c], "-n");
 214         }
 215
 216         while (1) {
 217                 c = getopt_long (argc, argv, "VvhnL46t:c:w:H:p:", longopts, &option);
 218
 219                 if (c == -1 || c == EOF)
 220                         break;
 221
 222                 switch (c) {
 223                 case '?':       /* usage */
 224                         usage5 ();
 225                 case 'h':       /* help */
 226                         print_help ();
 227                         exit (STATE_OK);
 228                         break;
 229                 case 'V':       /* version */
 230                         print_revision (progname, NP_VERSION);
 231                         exit (STATE_OK);
 232                         break;
 233                 case 't':       /* timeout period */
 234                         timeout_interval = atoi (optarg);
 235                         break;
 236                 case 'v':       /* verbose mode */
 237                         verbose++;
 238                         break;
 239                 case '4':       /* IPv4 only */
 240                         address_family = AF_INET;
 241                         break;
 242                 case '6':       /* IPv6 only */
 243 #ifdef USE_IPV6
 244                         address_family = AF_INET6;
 245 #else
 246                         usage (_("IPv6 support not available\n"));
 247 #endif
 248                         break;
 249                 case 'H':       /* hostname */
 250                         ptr=optarg;
 251                         while (1) {
 252                                 n_addresses++;
 253                                 if (n_addresses > max_addr) {
 254                                         max_addr *= 2;
 255                                         addresses = realloc (addresses, sizeof(char*) * max_addr);
 256                                         if (addresses == NULL)
 257                                                 die (STATE_UNKNOWN, _("Could not realloc() addresses\n"));
 258                                 }
 259                                 addresses[n_addresses-1] = ptr;
 260                                 if ((ptr = index (ptr, ','))) {
 261                                         strcpy (ptr, "");
 262                                         ptr += sizeof(char);
 263                                 } else {
 264                                         break;
 265                                 }
 266                         }
 267                         break;
 268                 case 'p':       /* number of packets to send */
 269                         if (is_intnonneg (optarg))
 270                                 max_packets = atoi (optarg);
 271                         else
 272                                 usage2 (_("<max_packets> (%s) must be a non-negative number\n"), optarg);
 273                         break;
 274                 case 'n':       /* no HTML */
 275                         display_html = FALSE;
 276                         break;
 277                 case 'L':       /* show HTML */
 278                         display_html = TRUE;
 279                         break;
 280                 case 'c':
 281                         get_threshold (optarg, &crta, &cpl);
 282                         break;
 283                 case 'w':
 284                         get_threshold (optarg, &wrta, &wpl);
 285                         break;
 286                 }
 287         }
 288
 289         c = optind;
 290         if (c == argc)
 291                 return validate_arguments ();
 292
 293         if (addresses[0] == NULL) {
 294                 if (is_host (argv[c]) == FALSE) {
 295                         usage2 (_("Invalid hostname/address"), argv[c]);
 296                 } else {
 297                         addresses[0] = argv[c++];
 298                         n_addresses++;
 299                         if (c == argc)
 300                                 return validate_arguments ();
 301                 }
 302         }
 303
 304         if (wpl == UNKNOWN_PACKET_LOSS) {
 305                 if (is_intpercent (argv[c]) == FALSE) {
 306                         printf (_("<wpl> (%s) must be an integer percentage\n"), argv[c]);
 307                         return ERROR;
 308                 } else {
 309                         wpl = atoi (argv[c++]);
 310                         if (c == argc)
 311                                 return validate_arguments ();
 312                 }
 313         }
 314
 315         if (cpl == UNKNOWN_PACKET_LOSS) {
 316                 if (is_intpercent (argv[c]) == FALSE) {
 317                         printf (_("<cpl> (%s) must be an integer percentage\n"), argv[c]);
 318                         return ERROR;
 319                 } else {
 320                         cpl = atoi (argv[c++]);
 321                         if (c == argc)
 322                                 return validate_arguments ();
 323                 }
 324         }
 325
 326         if (wrta < 0.0) {
 327                 if (is_negative (argv[c])) {
 328                         printf (_("<wrta> (%s) must be a non-negative number\n"), argv[c]);
 329                         return ERROR;
 330                 } else {
 331                         wrta = atof (argv[c++]);
 332                         if (c == argc)
 333                                 return validate_arguments ();
 334                 }
 335         }
 336
 337         if (crta < 0.0) {
 338                 if (is_negative (argv[c])) {
 339                         printf (_("<crta> (%s) must be a non-negative number\n"), argv[c]);
 340                         return ERROR;
 341                 } else {
 342                         crta = atof (argv[c++]);
 343                         if (c == argc)
 344                                 return validate_arguments ();
 345                 }
 346         }
 347
 348         if (max_packets == -1) {
 349                 if (is_intnonneg (argv[c])) {
 350                         max_packets = atoi (argv[c++]);
 351                 } else {
 352                         printf (_("<max_packets> (%s) must be a non-negative number\n"), argv[c]);
 353                         return ERROR;
 354                 }
 355         }
 356
 357         return validate_arguments ();
 358 }
 359
 360
 361
 362 int
 363 get_threshold (char *arg, float *trta, int *tpl)
 364 {
 365         if (is_intnonneg (arg) && sscanf (arg, "%f", trta) == 1)
 366                 return OK;
 367         else if (strpbrk (arg, ",:") && strstr (arg, "%") && sscanf (arg, "%f%*[:,]%d%%", trta, tpl) == 2)
 368                 return OK;
 369         else if (strstr (arg, "%") && sscanf (arg, "%d%%", tpl) == 1)
 370                 return OK;
 371
 372         usage2 (_("%s: Warning threshold must be integer or percentage!\n\n"), arg);
 373         return STATE_UNKNOWN;
 374 }
 375
 376
 377
 378 int
 379 validate_arguments ()
 380 {
 381         float max_seconds;
 382         int i;
 383
 384         if (wrta < 0.0) {
 385                 printf (_("<wrta> was not set\n"));
 386                 return ERROR;
 387         }
 388         else if (crta < 0.0) {
 389                 printf (_("<crta> was not set\n"));
 390                 return ERROR;
 391         }
 392         else if (wpl == UNKNOWN_PACKET_LOSS) {
 393                 printf (_("<wpl> was not set\n"));
 394                 return ERROR;
 395         }
 396         else if (cpl == UNKNOWN_PACKET_LOSS) {
 397                 printf (_("<cpl> was not set\n"));
 398                 return ERROR;
 399         }
 400         else if (wrta > crta) {
 401                 printf (_("<wrta> (%f) cannot be larger than <crta> (%f)\n"), wrta, crta);
 402                 return ERROR;
 403         }
 404         else if (wpl > cpl) {
 405                 printf (_("<wpl> (%d) cannot be larger than <cpl> (%d)\n"), wpl, cpl);
 406                 return ERROR;
 407         }
 408
 409         if (max_packets == -1)
 410                 max_packets = DEFAULT_MAX_PACKETS;
 411
 412         max_seconds = crta / 1000.0 * max_packets + max_packets;
 413         if (max_seconds > timeout_interval)
 414                 timeout_interval = (int)max_seconds;
 415
 416         for (i=0; i<n_addresses; i++) {
 417                 if (is_host(addresses[i]) == FALSE)
 418                         usage2 (_("Invalid hostname/address"), addresses[i]);
 419         }
 420
 421         if (n_addresses == 0) {
 422                 usage (_("You must specify a server address or host name"));
 423         }
 424
 425         return OK;
 426 }
 427
 428
 429
 430 int
 431 run_ping (const char *cmd, const char *addr)
 432 {
 433         char buf[MAX_INPUT_BUFFER];
 434         int result = STATE_UNKNOWN;
 435
 436         if ((child_process = spopen (cmd)) == NULL)
 437                 die (STATE_UNKNOWN, _("Could not open pipe: %s\n"), cmd);
 438
 439         child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
 440         if (child_stderr == NULL)
 441                 printf (_("Cannot open stderr for %s\n"), cmd);
 442
 443         while (fgets (buf, MAX_INPUT_BUFFER - 1, child_process)) {
 444
 445                 if (verbose >= 3)
 446                         printf("Output: %s", buf);
 447
 448                 result = max_state (result, error_scan (buf, addr));
 449
 450                 /* get the percent loss statistics */
 451                 if(sscanf(buf,"%*d packets transmitted, %*d packets received, +%*d errors, %d%% packet loss",&pl)==1 ||
 452                          sscanf(buf,"%*d packets transmitted, %*d packets received, +%*d duplicates, %d%% packet loss", &pl) == 1 ||
 453                          sscanf(buf,"%*d packets transmitted, %*d received, +%*d duplicates, %d%% packet loss", &pl) == 1 ||
 454                          sscanf(buf,"%*d packets transmitted, %*d packets received, %d%% packet loss",&pl)==1 ||
 455                          sscanf(buf,"%*d packets transmitted, %*d packets received, %d%% loss, time",&pl)==1 ||
 456                          sscanf(buf,"%*d packets transmitted, %*d received, %d%% loss, time", &pl)==1 ||
 457                          sscanf(buf,"%*d packets transmitted, %*d received, %d%% packet loss, time", &pl)==1 ||
 458                          sscanf(buf,"%*d packets transmitted, %*d received, +%*d errors, %d%% packet loss", &pl) == 1 ||
 459                          sscanf(buf,"%*d packets transmitted %*d received, +%*d errors, %d%% packet loss", &pl) == 1
 460                          )
 461                         continue;
 462
 463                 /* get the round trip average */
 464                 else
 465                         if(sscanf(buf,"round-trip min/avg/max = %*f/%f/%*f",&rta)==1 ||
 466                                  sscanf(buf,"round-trip min/avg/max/mdev = %*f/%f/%*f/%*f",&rta)==1 ||
 467                                  sscanf(buf,"round-trip min/avg/max/sdev = %*f/%f/%*f/%*f",&rta)==1 ||
 468                                  sscanf(buf,"round-trip min/avg/max/stddev = %*f/%f/%*f/%*f",&rta)==1 ||
 469                                  sscanf(buf,"round-trip min/avg/max/std-dev = %*f/%f/%*f/%*f",&rta)==1 ||
 470                                  sscanf(buf,"round-trip (ms) min/avg/max = %*f/%f/%*f",&rta)==1 ||
 471                                  sscanf(buf,"round-trip (ms) min/avg/max/stddev = %*f/%f/%*f/%*f",&rta)==1 ||
 472                                  sscanf(buf,"rtt min/avg/max/mdev = %*f/%f/%*f/%*f ms",&rta)==1)
 473                         continue;
 474         }
 475
 476         /* this is needed because there is no rta if all packets are lost */
 477         if (pl == 100)
 478                 rta = crta;
 479
 480         /* check stderr, setting at least WARNING if there is output here */
 481         /* Add warning into warn_text */
 482         while (fgets (buf, MAX_INPUT_BUFFER - 1, child_stderr)) {
 483                 if (! strstr(buf,"WARNING - no SO_TIMESTAMP support, falling back to SIOCGSTAMP")) {
 484                         if (verbose >= 3) {
 485                                 printf("Got stderr: %s", buf);
 486                         }
 487                         if ((result=error_scan(buf, addr)) == STATE_OK) {
 488                                 result = STATE_WARNING;
 489                                 if (warn_text == NULL) {
 490                                         warn_text = strdup(_("System call sent warnings to stderr "));
 491                                 } else {
 492                                         asprintf(&warn_text, "%s %s", warn_text, _("System call sent warnings to stderr "));
 493                                 }
 494                         }
 495                 }
 496         }
 497
 498         (void) fclose (child_stderr);
 499
 500
 501         /* close the pipe - WARNING if status is set */
 502         if (spclose (child_process))
 503                 result = max_state (result, STATE_WARNING);
 504
 505         if (warn_text == NULL)
 506                 warn_text = strdup("");
 507
 508         return result;
 509 }
 510
 511
 512
 513 int
 514 error_scan (char buf[MAX_INPUT_BUFFER], const char *addr)
 515 {
 516         if (strstr (buf, "Network is unreachable") ||
 517                 strstr (buf, "Destination Net Unreachable")
 518                 )
 519                 die (STATE_CRITICAL, _("CRITICAL - Network Unreachable (%s)"), addr);
 520         else if (strstr (buf, "Destination Host Unreachable"))
 521                 die (STATE_CRITICAL, _("CRITICAL - Host Unreachable (%s)"), addr);
 522         else if (strstr (buf, "Destination Port Unreachable"))
 523                 die (STATE_CRITICAL, _("CRITICAL - Bogus ICMP: Port Unreachable (%s)"), addr);
 524         else if (strstr (buf, "Destination Protocol Unreachable"))
 525                 die (STATE_CRITICAL, _("CRITICAL - Bogus ICMP: Protocol Unreachable (%s)"), addr);
 526         else if (strstr (buf, "Destination Net Prohibited"))
 527                 die (STATE_CRITICAL, _("CRITICAL - Network Prohibited (%s)"), addr);
 528         else if (strstr (buf, "Destination Host Prohibited"))
 529                 die (STATE_CRITICAL, _("CRITICAL - Host Prohibited (%s)"), addr);
 530         else if (strstr (buf, "Packet filtered"))
 531                 die (STATE_CRITICAL, _("CRITICAL - Packet Filtered (%s)"), addr);
 532         else if (strstr (buf, "unknown host" ))
 533                 die (STATE_CRITICAL, _("CRITICAL - Host not found (%s)"), addr);
 534         else if (strstr (buf, "Time to live exceeded"))
 535                 die (STATE_CRITICAL, _("CRITICAL - Time to live exceeded (%s)"), addr);
 536
 537         if (strstr (buf, "(DUP!)") || strstr (buf, "DUPLICATES FOUND")) {
 538                 if (warn_text == NULL)
 539                         warn_text = strdup (_(WARN_DUPLICATES));
 540                 else if (! strstr (warn_text, _(WARN_DUPLICATES)) &&
 541                          asprintf (&warn_text, "%s %s", warn_text, _(WARN_DUPLICATES)) == -1)
 542                         die (STATE_UNKNOWN, _("Unable to realloc warn_text"));
 543                 return (STATE_WARNING);
 544         }
 545
 546         return (STATE_OK);
 547 }
 548
 549
 550
 551 void
 552 print_help (void)
 553 {
 554         print_revision (progname, NP_VERSION);
 555
 556         printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
 557         printf (COPYRIGHT, copyright, email);
 558
 559         printf (_("Use ping to check connection statistics for a remote host."));
 560
 561   printf ("\n\n");
 562
 563         print_usage ();
 564
 565         printf (UT_HELP_VRSN);
 566         printf (UT_EXTRA_OPTS);
 567
 568         printf (UT_IPv46);
 569
 570         printf (" %s\n", "-H, --hostname=HOST");
 571   printf ("    %s\n", _("host to ping"));
 572   printf (" %s\n", "-w, --warning=THRESHOLD");
 573   printf ("    %s\n", _("warning threshold pair"));
 574   printf (" %s\n", "-c, --critical=THRESHOLD");
 575   printf ("    %s\n", _("critical threshold pair"));
 576   printf (" %s\n", "-p, --packets=INTEGER");
 577   printf ("    %s ", _("number of ICMP ECHO packets to send"));
 578   printf (_("(Default: %d)\n"), DEFAULT_MAX_PACKETS);
 579   printf (" %s\n", "-L, --link");
 580   printf ("    %s\n", _("show HTML in the plugin output (obsoleted by urlize)"));
 581
 582         printf (UT_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
 583
 584   printf ("\n");
 585         printf ("%s\n", _("THRESHOLD is <rta>,<pl>% where <rta> is the round trip average travel"));
 586   printf ("%s\n", _("time (ms) which triggers a WARNING or CRITICAL state, and <pl> is the"));
 587   printf ("%s\n", _("percentage of packet loss to trigger an alarm state."));
 588
 589   printf ("\n");
 590         printf ("%s\n", _("This plugin uses the ping command to probe the specified host for packet loss"));
 591   printf ("%s\n", _("(percentage) and round trip average (milliseconds). It can produce HTML output"));
 592   printf ("%s\n", _("linking to a traceroute CGI contributed by Ian Cass. The CGI can be found in"));
 593   printf ("%s\n", _("the contrib area of the downloads section at http://www.nagios.org/"));
 594
 595         printf (UT_SUPPORT);
 596 }
 597
 598 void
 599 print_usage (void)
 600 {
 601   printf ("%s\n", _("Usage:"));
 602         printf ("%s -H <host_address> -w <wrta>,<wpl>%% -c <crta>,<cpl>%%\n", progname);
 603   printf (" [-p packets] [-t timeout] [-4|-6]\n");
 604 }