src/oping.c

   1 /**
   2  * Object oriented C module to send ICMP and ICMPv6 `echo's.
   3  * Copyright (C) 2006-2014  Florian octo Forster <ff at octo.it>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; only version 2 of the License is
   8  * applicable.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  18  */
  19
  20 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #if STDC_HEADERS
  25 # include <stdlib.h>
  26 # include <stdio.h>
  27 # include <string.h>
  28 # include <stdint.h>
  29 # include <inttypes.h>
  30 # include <errno.h>
  31 # include <assert.h>
  32 #else
  33 # error "You don't have the standard C99 header files installed"
  34 #endif /* STDC_HEADERS */
  35
  36 #if HAVE_UNISTD_H
  37 # include <unistd.h>
  38 #endif
  39
  40 #if HAVE_MATH_H
  41 # include <math.h>
  42 #endif
  43
  44 #if TIME_WITH_SYS_TIME
  45 # include <sys/time.h>
  46 # include <time.h>
  47 #else
  48 # if HAVE_SYS_TIME_H
  49 #  include <sys/time.h>
  50 # else
  51 #  include <time.h>
  52 # endif
  53 #endif
  54
  55 #if HAVE_SYS_SOCKET_H
  56 # include <sys/socket.h>
  57 #endif
  58 #if HAVE_NETINET_IN_H
  59 # include <netinet/in.h>
  60 #endif
  61 #if HAVE_NETINET_IP_H
  62 # include <netinet/ip.h>
  63 #endif
  64
  65 #if HAVE_NETDB_H
  66 # include <netdb.h> /* NI_MAXHOST */
  67 #endif
  68
  69 #if HAVE_SIGNAL_H
  70 # include <signal.h>
  71 #endif
  72
  73 #if HAVE_SYS_TYPES_H
  74 #include <sys/types.h>
  75 #endif
  76
  77 #include <locale.h>
  78 #include <langinfo.h>
  79
  80 #if USE_NCURSES
  81 # define NCURSES_OPAQUE 1
  82 /* http://newsgroups.derkeiler.com/Archive/Rec/rec.games.roguelike.development/2010-09/msg00050.html */
  83 # define _X_OPEN_SOURCE_EXTENDED
  84
  85 # if HAVE_NCURSESW_NCURSES_H
  86 #  include <ncursesw/ncurses.h>
  87 # elif HAVE_NCURSES_H
  88 #  include <ncurses.h>
  89 # endif
  90
  91 # define OPING_GREEN 1
  92 # define OPING_YELLOW 2
  93 # define OPING_RED 3
  94 # define OPING_GREEN_HIST 4
  95 # define OPING_YELLOW_HIST 5
  96 # define OPING_RED_HIST 6
  97
  98 static char const * const hist_symbols_utf8[] = {
  99         "▁", "▂", "▃", "▄", "▅", "▆", "▇", "█" };
 100 static size_t const hist_symbols_utf8_num = sizeof (hist_symbols_utf8)
 101         / sizeof (hist_symbols_utf8[0]);
 102
 103 /* scancodes for 6 levels of horizontal bars, ncurses-specific */
 104 /* those are not the usual constants because those are not constant */
 105 static int const hist_symbols_acs[] = {
 106         115, /* ACS_S9 "⎽" */
 107         114, /* ACS_S7 "⎼" */
 108         113, /* ACS_S5 "─" */
 109         112, /* ACS_S3 "⎻" */
 110         111  /* ACS_S1 "⎺" */
 111 };
 112 static size_t const hist_symbols_acs_num = sizeof (hist_symbols_acs)
 113         / sizeof (hist_symbols_acs[0]);
 114
 115 /* use different colors without a background for scancodes */
 116 static int const hist_colors_utf8[] = {
 117         OPING_GREEN_HIST, OPING_YELLOW_HIST, OPING_RED_HIST };
 118 static int const hist_colors_acs[] = {
 119         OPING_GREEN, OPING_YELLOW, OPING_RED };
 120 /* assuming that both arrays are the same size */
 121 static size_t const hist_colors_num = sizeof (hist_colors_utf8)
 122         / sizeof (hist_colors_utf8[0]);
 123 #endif
 124
 125 #include "oping.h"
 126
 127 #ifndef _POSIX_SAVED_IDS
 128 # define _POSIX_SAVED_IDS 0
 129 #endif
 130
 131 #ifndef IPTOS_MINCOST
 132 # define IPTOS_MINCOST 0x02
 133 #endif
 134
 135 /* Remove GNU specific __attribute__ settings when using another compiler */
 136 #if !__GNUC__
 137 # define __attribute__(x) /**/
 138 #endif
 139
 140 typedef struct ping_context
 141 {
 142         char host[NI_MAXHOST];
 143         char addr[NI_MAXHOST];
 144
 145         int index;
 146         int req_sent;
 147         int req_rcvd;
 148
 149         double latency_min;
 150         double latency_max;
 151         double latency_total;
 152         double latency_total_square;
 153
 154 #if USE_NCURSES
 155         WINDOW *window;
 156 #endif
 157 } ping_context_t;
 158
 159 static double  opt_interval   = 1.0;
 160 static int     opt_addrfamily = PING_DEF_AF;
 161 static char   *opt_srcaddr    = NULL;
 162 static char   *opt_device     = NULL;
 163 static char   *opt_filename   = NULL;
 164 static int     opt_count      = -1;
 165 static int     opt_send_ttl   = 64;
 166 static uint8_t opt_send_qos   = 0;
 167 static double  opt_exit_status_threshold = 1.0;
 168 #if USE_NCURSES
 169 static int     opt_utf8       = 0;
 170 #endif
 171
 172 static int host_num = 0;
 173
 174 #if USE_NCURSES
 175 static WINDOW *main_win = NULL;
 176 #endif
 177
 178 static void sigint_handler (int signal) /* {{{ */
 179 {
 180         /* Make compiler happy */
 181         signal = 0;
 182         /* Exit the loop */
 183         opt_count = 0;
 184 } /* }}} void sigint_handler */
 185
 186 static ping_context_t *context_create (void) /* {{{ */
 187 {
 188         ping_context_t *ret;
 189
 190         if ((ret = malloc (sizeof (ping_context_t))) == NULL)
 191                 return (NULL);
 192
 193         memset (ret, '\0', sizeof (ping_context_t));
 194
 195         ret->latency_min   = -1.0;
 196         ret->latency_max   = -1.0;
 197         ret->latency_total = 0.0;
 198         ret->latency_total_square = 0.0;
 199
 200 #if USE_NCURSES
 201         ret->window = NULL;
 202 #endif
 203
 204         return (ret);
 205 } /* }}} ping_context_t *context_create */
 206
 207 static void context_destroy (ping_context_t *context) /* {{{ */
 208 {
 209         if (context == NULL)
 210                 return;
 211
 212 #if USE_NCURSES
 213         if (context->window != NULL)
 214         {
 215                 delwin (context->window);
 216                 context->window = NULL;
 217         }
 218 #endif
 219
 220         free (context);
 221 } /* }}} void context_destroy */
 222
 223 static double context_get_average (ping_context_t *ctx) /* {{{ */
 224 {
 225         double num_total;
 226
 227         if (ctx == NULL)
 228                 return (-1.0);
 229
 230         if (ctx->req_rcvd < 1)
 231                 return (-0.0);
 232
 233         num_total = (double) ctx->req_rcvd;
 234         return (ctx->latency_total / num_total);
 235 } /* }}} double context_get_average */
 236
 237 static double context_get_stddev (ping_context_t *ctx) /* {{{ */
 238 {
 239         double num_total;
 240
 241         if (ctx == NULL)
 242                 return (-1.0);
 243
 244         if (ctx->req_rcvd < 1)
 245                 return (-0.0);
 246         else if (ctx->req_rcvd < 2)
 247                 return (0.0);
 248
 249         num_total = (double) ctx->req_rcvd;
 250         return (sqrt (((num_total * ctx->latency_total_square)
 251                                         - (ctx->latency_total * ctx->latency_total))
 252                                 / (num_total * (num_total - 1.0))));
 253 } /* }}} double context_get_stddev */
 254
 255 static double context_get_packet_loss (const ping_context_t *ctx) /* {{{ */
 256 {
 257         if (ctx == NULL)
 258                 return (-1.0);
 259
 260         if (ctx->req_sent < 1)
 261                 return (0.0);
 262
 263         return (100.0 * (ctx->req_sent - ctx->req_rcvd)
 264                         / ((double) ctx->req_sent));
 265 } /* }}} double context_get_packet_loss */
 266
 267 static int ping_initialize_contexts (pingobj_t *ping) /* {{{ */
 268 {
 269         pingobj_iter_t *iter;
 270         int index;
 271
 272         if (ping == NULL)
 273                 return (EINVAL);
 274
 275         index = 0;
 276         for (iter = ping_iterator_get (ping);
 277                         iter != NULL;
 278                         iter = ping_iterator_next (iter))
 279         {
 280                 ping_context_t *context;
 281                 size_t buffer_size;
 282
 283                 context = context_create ();
 284                 context->index = index;
 285
 286                 buffer_size = sizeof (context->host);
 287                 ping_iterator_get_info (iter, PING_INFO_HOSTNAME, context->host, &buffer_size);
 288
 289                 buffer_size = sizeof (context->addr);
 290                 ping_iterator_get_info (iter, PING_INFO_ADDRESS, context->addr, &buffer_size);
 291
 292                 ping_iterator_set_context (iter, (void *) context);
 293
 294                 index++;
 295         }
 296
 297         return (0);
 298 } /* }}} int ping_initialize_contexts */
 299
 300 static void usage_exit (const char *name, int status) /* {{{ */
 301 {
 302         fprintf (stderr, "Usage: %s [OPTIONS] "
 303                                 "-f filename | host [host [host ...]]\n"
 304
 305                         "\nAvailable options:\n"
 306                         "  -4|-6        force the use of IPv4 or IPv6\n"
 307                         "  -c count     number of ICMP packets to send\n"
 308                         "  -i interval  interval with which to send ICMP packets\n"
 309                         "  -t ttl       time to live for each ICMP packet\n"
 310                         "  -Q qos       Quality of Service (QoS) of outgoing packets\n"
 311                         "               Use \"-Q help\" for a list of valid options.\n"
 312                         "  -I srcaddr   source address\n"
 313                         "  -D device    outgoing interface name\n"
 314                         "  -f filename  filename to read hosts from\n"
 315 #if USE_NCURSES
 316                         "  -u / -U      force / disable UTF-8 output\n"
 317 #endif
 318                         "  -Z percent   Exit with non-zero exit status if more than this percentage of\n"
 319                         "               probes timed out. (default: never)\n"
 320
 321                         "\noping "PACKAGE_VERSION", http://verplant.org/liboping/\n"
 322                         "by Florian octo Forster <octo@verplant.org>\n"
 323                         "for contributions see `AUTHORS'\n",
 324                         name);
 325         exit (status);
 326 } /* }}} void usage_exit */
 327
 328 __attribute__((noreturn))
 329 static void usage_qos_exit (const char *arg, int status) /* {{{ */
 330 {
 331         if (arg != 0)
 332                 fprintf (stderr, "Invalid QoS argument: \"%s\"\n\n", arg);
 333
 334         fprintf (stderr, "Valid QoS arguments (option \"-Q\") are:\n"
 335                         "\n"
 336                         "  Differentiated Services (IPv4 and IPv6, RFC 2474)\n"
 337                         "\n"
 338                         "    be                     Best Effort (BE, default PHB).\n"
 339                         "    ef                     Expedited Forwarding (EF) PHB group (RFC 3246).\n"
 340                         "                           (low delay, low loss, low jitter)\n"
 341                         "    va                     Voice Admit (VA) DSCP (RFC 5865).\n"
 342                         "                           (capacity-admitted traffic)\n"
 343                         "    af[1-4][1-3]           Assured Forwarding (AF) PHB group (RFC 2597).\n"
 344                         "                           For example: \"af12\" (class 1, precedence 2)\n"
 345                         "    cs[0-7]                Class Selector (CS) PHB group (RFC 2474).\n"
 346                         "                           For example: \"cs1\" (priority traffic)\n"
 347                         "\n"
 348                         "  Type of Service (IPv4, RFC 1349, obsolete)\n"
 349                         "\n"
 350                         "    lowdelay     (%#04x)    minimize delay\n"
 351                         "    throughput   (%#04x)    maximize throughput\n"
 352                         "    reliability  (%#04x)    maximize reliability\n"
 353                         "    mincost      (%#04x)    minimize monetary cost\n"
 354                         "\n"
 355                         "  Specify manually\n"
 356                         "\n"
 357                         "    0x00 - 0xff            Hexadecimal numeric specification.\n"
 358                         "       0 -  255            Decimal numeric specification.\n"
 359                         "\n",
 360                         (unsigned int) IPTOS_LOWDELAY,
 361                         (unsigned int) IPTOS_THROUGHPUT,
 362                         (unsigned int) IPTOS_RELIABILITY,
 363                         (unsigned int) IPTOS_MINCOST);
 364
 365         exit (status);
 366 } /* }}} void usage_qos_exit */
 367
 368 static int set_opt_send_qos (const char *opt) /* {{{ */
 369 {
 370         if (opt == NULL)
 371                 return (EINVAL);
 372
 373         if (strcasecmp ("help", opt) == 0)
 374                 usage_qos_exit (/* arg = */ NULL, /* status = */ EXIT_SUCCESS);
 375         /* DiffServ (RFC 2474): */
 376         /* - Best effort (BE) */
 377         else if (strcasecmp ("be", opt) == 0)
 378                 opt_send_qos = 0;
 379         /* - Expedited Forwarding (EF, RFC 3246) */
 380         else if (strcasecmp ("ef", opt) == 0)
 381                 opt_send_qos = 0xB8; /* == 0x2E << 2 */
 382         /* - Voice Admit (VA, RFC 5865) */
 383         else if (strcasecmp ("va", opt) == 0)
 384                 opt_send_qos = 0xB0; /* == 0x2D << 2 */
 385         /* - Assured Forwarding (AF, RFC 2597) */
 386         else if ((strncasecmp ("af", opt, strlen ("af")) == 0)
 387                         && (strlen (opt) == 4))
 388         {
 389                 uint8_t dscp;
 390                 uint8_t class = 0;
 391                 uint8_t prec = 0;
 392
 393                 /* There are four classes, AF1x, AF2x, AF3x, and AF4x. */
 394                 if (opt[2] == '1')
 395                         class = 1;
 396                 else if (opt[2] == '2')
 397                         class = 2;
 398                 else if (opt[2] == '3')
 399                         class = 3;
 400                 else if (opt[2] == '4')
 401                         class = 4;
 402                 else
 403                         usage_qos_exit (/* arg = */ opt, /* status = */ EXIT_SUCCESS);
 404
 405                 /* In each class, there are three precedences, AFx1, AFx2, and AFx3 */
 406                 if (opt[3] == '1')
 407                         prec = 1;
 408                 else if (opt[3] == '2')
 409                         prec = 2;
 410                 else if (opt[3] == '3')
 411                         prec = 3;
 412                 else
 413                         usage_qos_exit (/* arg = */ opt, /* status = */ EXIT_SUCCESS);
 414
 415                 dscp = (8 * class) + (2 * prec);
 416                 /* The lower two bits are used for Explicit Congestion Notification (ECN) */
 417                 opt_send_qos = dscp << 2;
 418         }
 419         /* - Class Selector (CS) */
 420         else if ((strncasecmp ("cs", opt, strlen ("cs")) == 0)
 421                         && (strlen (opt) == 3))
 422         {
 423                 uint8_t class;
 424
 425                 if ((opt[2] < '0') || (opt[2] > '7'))
 426                         usage_qos_exit (/* arg = */ opt, /* status = */ EXIT_FAILURE);
 427
 428                 /* Not exactly legal by the C standard, but I don't know of any
 429                  * system not supporting this hack. */
 430                 class = ((uint8_t) opt[2]) - ((uint8_t) '0');
 431                 opt_send_qos = class << 5;
 432         }
 433         /* Type of Service (RFC 1349) */
 434         else if (strcasecmp ("lowdelay", opt) == 0)
 435                 opt_send_qos = IPTOS_LOWDELAY;
 436         else if (strcasecmp ("throughput", opt) == 0)
 437                 opt_send_qos = IPTOS_THROUGHPUT;
 438         else if (strcasecmp ("reliability", opt) == 0)
 439                 opt_send_qos = IPTOS_RELIABILITY;
 440         else if (strcasecmp ("mincost", opt) == 0)
 441                 opt_send_qos = IPTOS_MINCOST;
 442         /* Numeric value */
 443         else
 444         {
 445                 unsigned long value;
 446                 char *endptr;
 447
 448                 errno = 0;
 449                 endptr = NULL;
 450                 value = strtoul (opt, &endptr, /* base = */ 0);
 451                 if ((errno != 0) || (endptr == opt)
 452                                 || (endptr == NULL) || (*endptr != 0)
 453                                 || (value > 0xff))
 454                         usage_qos_exit (/* arg = */ opt, /* status = */ EXIT_FAILURE);
 455
 456                 opt_send_qos = (uint8_t) value;
 457         }
 458
 459         return (0);
 460 } /* }}} int set_opt_send_qos */
 461
 462 static char *format_qos (uint8_t qos, char *buffer, size_t buffer_size) /* {{{ */
 463 {
 464         uint8_t dscp;
 465         uint8_t ecn;
 466         char *dscp_str;
 467         char *ecn_str;
 468
 469         dscp = qos >> 2;
 470         ecn = qos & 0x03;
 471
 472         switch (dscp)
 473         {
 474                 case 0x00: dscp_str = "be";  break;
 475                 case 0x2e: dscp_str = "ef";  break;
 476                 case 0x2d: dscp_str = "va";  break;
 477                 case 0x0a: dscp_str = "af11"; break;
 478                 case 0x0c: dscp_str = "af12"; break;
 479                 case 0x0e: dscp_str = "af13"; break;
 480                 case 0x12: dscp_str = "af21"; break;
 481                 case 0x14: dscp_str = "af22"; break;
 482                 case 0x16: dscp_str = "af23"; break;
 483                 case 0x1a: dscp_str = "af31"; break;
 484                 case 0x1c: dscp_str = "af32"; break;
 485                 case 0x1e: dscp_str = "af33"; break;
 486                 case 0x22: dscp_str = "af41"; break;
 487                 case 0x24: dscp_str = "af42"; break;
 488                 case 0x26: dscp_str = "af43"; break;
 489                 case 0x08: dscp_str = "cs1";  break;
 490                 case 0x10: dscp_str = "cs2";  break;
 491                 case 0x18: dscp_str = "cs3";  break;
 492                 case 0x20: dscp_str = "cs4";  break;
 493                 case 0x28: dscp_str = "cs5";  break;
 494                 case 0x30: dscp_str = "cs6";  break;
 495                 case 0x38: dscp_str = "cs7";  break;
 496                 default:   dscp_str = NULL;
 497         }
 498
 499         switch (ecn)
 500         {
 501                 case 0x01: ecn_str = ",ecn(1)"; break;
 502                 case 0x02: ecn_str = ",ecn(0)"; break;
 503                 case 0x03: ecn_str = ",ce"; break;
 504                 default:   ecn_str = "";
 505         }
 506
 507         if (dscp_str == NULL)
 508                 snprintf (buffer, buffer_size, "0x%02x%s", dscp, ecn_str);
 509         else
 510                 snprintf (buffer, buffer_size, "%s%s", dscp_str, ecn_str);
 511         buffer[buffer_size - 1] = 0;
 512
 513         return (buffer);
 514 } /* }}} char *format_qos */
 515
 516 static int read_options (int argc, char **argv) /* {{{ */
 517 {
 518         int optchar;
 519
 520         while (1)
 521         {
 522                 optchar = getopt (argc, argv, "46c:hi:I:t:Q:f:D:Z:"
 523 #if USE_NCURSES
 524                                 "uU"
 525 #endif
 526                                 );
 527
 528                 if (optchar == -1)
 529                         break;
 530
 531                 switch (optchar)
 532                 {
 533                         case '4':
 534                         case '6':
 535                                 opt_addrfamily = (optchar == '4') ? AF_INET : AF_INET6;
 536                                 break;
 537
 538                         case 'c':
 539                                 {
 540                                         int new_count;
 541                                         new_count = atoi (optarg);
 542                                         if (new_count > 0)
 543                                                 opt_count = new_count;
 544                                         else
 545                                                 fprintf(stderr, "Ignoring invalid count: %s\n",
 546                                                                 optarg);
 547                                 }
 548                                 break;
 549
 550                         case 'f':
 551                                 {
 552                                         if (opt_filename != NULL)
 553                                                 free (opt_filename);
 554                                         opt_filename = strdup (optarg);
 555                                 }
 556                                 break;
 557
 558                         case 'i':
 559                                 {
 560                                         double new_interval;
 561                                         new_interval = atof (optarg);
 562                                         if (new_interval < 0.001)
 563                                                 fprintf (stderr, "Ignoring invalid interval: %s\n",
 564                                                                 optarg);
 565                                         else
 566                                                 opt_interval = new_interval;
 567                                 }
 568                                 break;
 569                         case 'I':
 570                                 {
 571                                         if (opt_srcaddr != NULL)
 572                                                 free (opt_srcaddr);
 573                                         opt_srcaddr = strdup (optarg);
 574                                 }
 575                                 break;
 576
 577                         case 'D':
 578                                 opt_device = optarg;
 579                                 break;
 580
 581                         case 't':
 582                         {
 583                                 int new_send_ttl;
 584                                 new_send_ttl = atoi (optarg);
 585                                 if ((new_send_ttl > 0) && (new_send_ttl < 256))
 586                                         opt_send_ttl = new_send_ttl;
 587                                 else
 588                                         fprintf (stderr, "Ignoring invalid TTL argument: %s\n",
 589                                                         optarg);
 590                                 break;
 591                         }
 592
 593                         case 'Q':
 594                                 set_opt_send_qos (optarg);
 595                                 break;
 596
 597 #if USE_NCURSES
 598                         case 'u':
 599                                 opt_utf8 = 2;
 600                                 break;
 601                         case 'U':
 602                                 opt_utf8 = 1;
 603                                 break;
 604 #endif
 605
 606                         case 'Z':
 607                         {
 608                                 char *endptr = NULL;
 609                                 double tmp;
 610
 611                                 errno = 0;
 612                                 tmp = strtod (optarg, &endptr);
 613                                 if ((errno != 0) || (endptr == NULL) || (*endptr != 0) || (tmp < 0.0) || (tmp > 100.0))
 614                                 {
 615                                         fprintf (stderr, "Ignoring invalid -Z argument: %s\n", optarg);
 616                                         fprintf (stderr, "The \"-Z\" option requires a numeric argument between 0 and 100.\n");
 617                                 }
 618                                 else
 619                                         opt_exit_status_threshold = tmp / 100.0;
 620
 621                                 break;
 622                         }
 623
 624                         case 'h':
 625                                 usage_exit (argv[0], 0);
 626                                 break;
 627                         default:
 628                                 usage_exit (argv[0], 1);
 629                 }
 630         }
 631
 632         return (optind);
 633 } /* }}} read_options */
 634
 635 static void time_normalize (struct timespec *ts) /* {{{ */
 636 {
 637         while (ts->tv_nsec < 0)
 638         {
 639                 if (ts->tv_sec == 0)
 640                 {
 641                         ts->tv_nsec = 0;
 642                         return;
 643                 }
 644
 645                 ts->tv_sec  -= 1;
 646                 ts->tv_nsec += 1000000000;
 647         }
 648
 649         while (ts->tv_nsec >= 1000000000)
 650         {
 651                 ts->tv_sec  += 1;
 652                 ts->tv_nsec -= 1000000000;
 653         }
 654 } /* }}} void time_normalize */
 655
 656 static void time_calc (struct timespec *ts_dest, /* {{{ */
 657                 const struct timespec *ts_int,
 658                 const struct timeval  *tv_begin,
 659                 const struct timeval  *tv_end)
 660 {
 661         ts_dest->tv_sec = tv_begin->tv_sec + ts_int->tv_sec;
 662         ts_dest->tv_nsec = (tv_begin->tv_usec * 1000) + ts_int->tv_nsec;
 663         time_normalize (ts_dest);
 664
 665         /* Assure that `(begin + interval) > end'.
 666          * This may seem overly complicated, but `tv_sec' is of type `time_t'
 667          * which may be `unsigned. *sigh* */
 668         if ((tv_end->tv_sec > ts_dest->tv_sec)
 669                         || ((tv_end->tv_sec == ts_dest->tv_sec)
 670                                 && ((tv_end->tv_usec * 1000) > ts_dest->tv_nsec)))
 671         {
 672                 ts_dest->tv_sec  = 0;
 673                 ts_dest->tv_nsec = 0;
 674                 return;
 675         }
 676
 677         ts_dest->tv_sec = ts_dest->tv_sec - tv_end->tv_sec;
 678         ts_dest->tv_nsec = ts_dest->tv_nsec - (tv_end->tv_usec * 1000);
 679         time_normalize (ts_dest);
 680 } /* }}} void time_calc */
 681
 682 #if USE_NCURSES
 683 static _Bool has_utf8() /* {{{ */
 684 {
 685 # if HAVE_NCURSESW_NCURSES_H
 686         if (!opt_utf8)
 687         {
 688                 /* Automatically determine */
 689                 if (strcasecmp ("UTF-8", nl_langinfo (CODESET)) == 0)
 690                         opt_utf8 = 2;
 691                 else
 692                         opt_utf8 = 1;
 693         }
 694         return ((_Bool) (opt_utf8 - 1));
 695 # else
 696         return (0);
 697 # endif
 698 } /* }}} _Bool has_utf8 */
 699
 700 static int update_prettyping_graph (ping_context_t *ctx, /* {{{ */
 701                 double latency, unsigned int sequence)
 702 {
 703         int color = OPING_RED;
 704         char const *symbol = "!";
 705         int symbolc = '!';
 706
 707         int x_max;
 708         int x_pos;
 709
 710         x_max = getmaxx (ctx->window);
 711         x_pos = ((sequence - 1) % (x_max - 4)) + 2;
 712
 713         if (latency >= 0.0)
 714         {
 715                 double ratio;
 716
 717                 size_t symbols_num = hist_symbols_acs_num;
 718                 size_t colors_num = 1;
 719
 720                 size_t index_symbols;
 721                 size_t index_colors;
 722                 size_t intensity;
 723
 724                 /* latency is in milliseconds, opt_interval is in seconds. */
 725                 ratio = (latency * 0.001) / opt_interval;
 726                 if (ratio > 1) {
 727                         ratio = 1.0;
 728                 }
 729
 730                 if (has_utf8 ())
 731                         symbols_num = hist_symbols_utf8_num;
 732
 733                 if (has_colors () == TRUE)
 734                         colors_num = hist_colors_num;
 735
 736                 intensity = (size_t) (ratio * ((double) (symbols_num * colors_num)));
 737                 if (intensity >= (symbols_num * colors_num))
 738                         intensity = (symbols_num * colors_num) - 1;
 739
 740                 index_symbols = intensity % symbols_num;
 741                 assert (index_symbols < symbols_num);
 742
 743                 index_colors = intensity / symbols_num;
 744                 assert (index_colors < colors_num);
 745
 746                 if (has_utf8())
 747                 {
 748                         color = hist_colors_utf8[index_colors];
 749                         symbol = hist_symbols_utf8[index_symbols];
 750                 }
 751                 else
 752                 {
 753                         color = hist_colors_acs[index_colors];
 754                         symbolc = hist_symbols_acs[index_symbols] | A_ALTCHARSET;
 755                 }
 756         }
 757         else /* if (!(latency >= 0.0)) */
 758                 wattron (ctx->window, A_BOLD);
 759
 760         if (has_colors () == TRUE)
 761                 wattron (ctx->window, COLOR_PAIR(color));
 762
 763         if (has_utf8())
 764                 mvwprintw (ctx->window, /* y = */ 3, /* x = */ x_pos, symbol);
 765         else
 766                 mvwaddch (ctx->window, /* y = */ 3, /* x = */ x_pos, symbolc);
 767
 768         if (has_colors () == TRUE)
 769                 wattroff (ctx->window, COLOR_PAIR(color));
 770
 771         /* Use negation here to handle NaN correctly. */
 772         if (!(latency >= 0.0))
 773                 wattroff (ctx->window, A_BOLD);
 774
 775         wprintw (ctx->window, " ");
 776         return (0);
 777 } /* }}} int update_prettyping_graph */
 778
 779 static int update_stats_from_context (ping_context_t *ctx, pingobj_iter_t *iter) /* {{{ */
 780 {
 781         double latency = -1.0;
 782         size_t buffer_len = sizeof (latency);
 783
 784         ping_iterator_get_info (iter, PING_INFO_LATENCY,
 785                         &latency, &buffer_len);
 786
 787         unsigned int sequence = 0;
 788         buffer_len = sizeof (sequence);
 789         ping_iterator_get_info (iter, PING_INFO_SEQUENCE,
 790                         &sequence, &buffer_len);
 791
 792
 793         if ((ctx == NULL) || (ctx->window == NULL))
 794                 return (EINVAL);
 795
 796         /* werase (ctx->window); */
 797
 798         box (ctx->window, 0, 0);
 799         wattron (ctx->window, A_BOLD);
 800         mvwprintw (ctx->window, /* y = */ 0, /* x = */ 5,
 801                         " %s ", ctx->host);
 802         wattroff (ctx->window, A_BOLD);
 803         wprintw (ctx->window, "ping statistics ");
 804         mvwprintw (ctx->window, /* y = */ 1, /* x = */ 2,
 805                         "%i packets transmitted, %i received, %.2f%% packet "
 806                         "loss, time %.1fms",
 807                         ctx->req_sent, ctx->req_rcvd,
 808                         context_get_packet_loss (ctx),
 809                         ctx->latency_total);
 810         if (ctx->req_rcvd != 0)
 811         {
 812                 double average;
 813                 double deviation;
 814
 815                 average = context_get_average (ctx);
 816                 deviation = context_get_stddev (ctx);
 817
 818                 mvwprintw (ctx->window, /* y = */ 2, /* x = */ 2,
 819                                 "rtt min/avg/max/sdev = %.3f/%.3f/%.3f/%.3f ms",
 820                                 ctx->latency_min,
 821                                 average,
 822                                 ctx->latency_max,
 823                                 deviation);
 824         }
 825
 826         update_prettyping_graph (ctx, latency, sequence);
 827
 828         wrefresh (ctx->window);
 829
 830         return (0);
 831 } /* }}} int update_stats_from_context */
 832
 833 static int on_resize (pingobj_t *ping) /* {{{ */
 834 {
 835         pingobj_iter_t *iter;
 836         int width = 0;
 837         int height = 0;
 838         int main_win_height;
 839
 840         getmaxyx (stdscr, height, width);
 841         if ((height < 1) || (width < 1))
 842                 return (EINVAL);
 843
 844         main_win_height = height - (5 * host_num);
 845         wresize (main_win, main_win_height, /* width = */ width);
 846         /* Allow scrolling */
 847         scrollok (main_win, TRUE);
 848         /* wsetscrreg (main_win, 0, main_win_height - 1); */
 849         /* Allow hardware accelerated scrolling. */
 850         idlok (main_win, TRUE);
 851         wrefresh (main_win);
 852
 853         for (iter = ping_iterator_get (ping);
 854                         iter != NULL;
 855                         iter = ping_iterator_next (iter))
 856         {
 857                 ping_context_t *context;
 858
 859                 context = ping_iterator_get_context (iter);
 860                 if (context == NULL)
 861                         continue;
 862
 863                 if (context->window != NULL)
 864                 {
 865                         delwin (context->window);
 866                         context->window = NULL;
 867                 }
 868                 context->window = newwin (/* height = */ 5,
 869                                 /* width = */ width,
 870                                 /* y = */ main_win_height + (5 * context->index),
 871                                 /* x = */ 0);
 872         }
 873
 874         return (0);
 875 } /* }}} */
 876
 877 static int check_resize (pingobj_t *ping) /* {{{ */
 878 {
 879         int need_resize = 0;
 880
 881         while (42)
 882         {
 883                 int key = wgetch (stdscr);
 884                 if (key == ERR)
 885                         break;
 886                 else if (key == KEY_RESIZE)
 887                         need_resize = 1;
 888         }
 889
 890         if (need_resize)
 891                 return (on_resize (ping));
 892         else
 893                 return (0);
 894 } /* }}} int check_resize */
 895
 896 static int pre_loop_hook (pingobj_t *ping) /* {{{ */
 897 {
 898         pingobj_iter_t *iter;
 899         int width = 0;
 900         int height = 0;
 901         int main_win_height;
 902
 903         initscr ();
 904         cbreak ();
 905         noecho ();
 906         nodelay (stdscr, TRUE);
 907
 908         getmaxyx (stdscr, height, width);
 909         if ((height < 1) || (width < 1))
 910                 return (EINVAL);
 911
 912         if (has_colors () == TRUE)
 913         {
 914                 start_color ();
 915                 init_pair (OPING_GREEN,  COLOR_GREEN,  /* default = */ 0);
 916                 init_pair (OPING_YELLOW, COLOR_YELLOW, /* default = */ 0);
 917                 init_pair (OPING_RED,    COLOR_RED,    /* default = */ 0);
 918                 init_pair (OPING_GREEN_HIST,  COLOR_GREEN,  COLOR_BLACK);
 919                 init_pair (OPING_YELLOW_HIST, COLOR_YELLOW, COLOR_GREEN);
 920                 init_pair (OPING_RED_HIST,    COLOR_RED,    COLOR_YELLOW);
 921         }
 922
 923         main_win_height = height - (5 * host_num);
 924         main_win = newwin (/* height = */ main_win_height,
 925                         /* width = */ width,
 926                         /* y = */ 0, /* x = */ 0);
 927         /* Allow scrolling */
 928         scrollok (main_win, TRUE);
 929         /* wsetscrreg (main_win, 0, main_win_height - 1); */
 930         /* Allow hardware accelerated scrolling. */
 931         idlok (main_win, TRUE);
 932         wmove (main_win, /* y = */ main_win_height - 1, /* x = */ 0);
 933         wrefresh (main_win);
 934
 935         for (iter = ping_iterator_get (ping);
 936                         iter != NULL;
 937                         iter = ping_iterator_next (iter))
 938         {
 939                 ping_context_t *context;
 940
 941                 context = ping_iterator_get_context (iter);
 942                 if (context == NULL)
 943                         continue;
 944
 945                 if (context->window != NULL)
 946                 {
 947                         delwin (context->window);
 948                         context->window = NULL;
 949                 }
 950                 context->window = newwin (/* height = */ 5,
 951                                 /* width = */ width,
 952                                 /* y = */ main_win_height + (5 * context->index),
 953                                 /* x = */ 0);
 954         }
 955
 956
 957         /* Don't know what good this does exactly, but without this code
 958          * "check_resize" will be called right after startup and *somehow*
 959          * this leads to display errors. If we purge all initial characters
 960          * here, the problem goes away. "wgetch" is non-blocking due to
 961          * "nodelay" (see above). */
 962         while (wgetch (stdscr) != ERR)
 963         {
 964                 /* eat up characters */;
 965         }
 966
 967         return (0);
 968 } /* }}} int pre_loop_hook */
 969
 970 static int pre_sleep_hook (pingobj_t *ping) /* {{{ */
 971 {
 972         return (check_resize (ping));
 973 } /* }}} int pre_sleep_hook */
 974
 975 static int post_sleep_hook (pingobj_t *ping) /* {{{ */
 976 {
 977         return (check_resize (ping));
 978 } /* }}} int pre_sleep_hook */
 979 #else /* if !USE_NCURSES */
 980 static int pre_loop_hook (pingobj_t *ping) /* {{{ */
 981 {
 982         pingobj_iter_t *iter;
 983
 984         for (iter = ping_iterator_get (ping);
 985                         iter != NULL;
 986                         iter = ping_iterator_next (iter))
 987         {
 988                 ping_context_t *ctx;
 989                 size_t buffer_size;
 990
 991                 ctx = ping_iterator_get_context (iter);
 992                 if (ctx == NULL)
 993                         continue;
 994
 995                 buffer_size = 0;
 996                 ping_iterator_get_info (iter, PING_INFO_DATA, NULL, &buffer_size);
 997
 998                 printf ("PING %s (%s) %zu bytes of data.\n",
 999                                 ctx->host, ctx->addr, buffer_size);
1000         }
1001
1002         return (0);
1003 } /* }}} int pre_loop_hook */
1004
1005 static int pre_sleep_hook (__attribute__((unused)) pingobj_t *ping) /* {{{ */
1006 {
1007         fflush (stdout);
1008
1009         return (0);
1010 } /* }}} int pre_sleep_hook */
1011
1012 static int post_sleep_hook (__attribute__((unused)) pingobj_t *ping) /* {{{ */
1013 {
1014         return (0);
1015 } /* }}} int post_sleep_hook */
1016 #endif
1017
1018 static void update_host_hook (pingobj_iter_t *iter, /* {{{ */
1019                 __attribute__((unused)) int index)
1020 {
1021         double          latency;
1022         unsigned int    sequence;
1023         int             recv_ttl;
1024         uint8_t         recv_qos;
1025         char            recv_qos_str[16];
1026         size_t          buffer_len;
1027         size_t          data_len;
1028         ping_context_t *context;
1029
1030         latency = -1.0;
1031         buffer_len = sizeof (latency);
1032         ping_iterator_get_info (iter, PING_INFO_LATENCY,
1033                         &latency, &buffer_len);
1034
1035         sequence = 0;
1036         buffer_len = sizeof (sequence);
1037         ping_iterator_get_info (iter, PING_INFO_SEQUENCE,
1038                         &sequence, &buffer_len);
1039
1040         recv_ttl = -1;
1041         buffer_len = sizeof (recv_ttl);
1042         ping_iterator_get_info (iter, PING_INFO_RECV_TTL,
1043                         &recv_ttl, &buffer_len);
1044
1045         recv_qos = 0;
1046         buffer_len = sizeof (recv_qos);
1047         ping_iterator_get_info (iter, PING_INFO_RECV_QOS,
1048                         &recv_qos, &buffer_len);
1049
1050         data_len = 0;
1051         ping_iterator_get_info (iter, PING_INFO_DATA,
1052                         NULL, &data_len);
1053
1054         context = (ping_context_t *) ping_iterator_get_context (iter);
1055
1056 #if USE_NCURSES
1057 # define HOST_PRINTF(...) wprintw(main_win, __VA_ARGS__)
1058 #else
1059 # define HOST_PRINTF(...) printf(__VA_ARGS__)
1060 #endif
1061
1062         context->req_sent++;
1063         if (latency > 0.0)
1064         {
1065                 context->req_rcvd++;
1066                 context->latency_total += latency;
1067                 context->latency_total_square += (latency * latency);
1068
1069                 if ((context->latency_max < 0.0) || (context->latency_max < latency))
1070                         context->latency_max = latency;
1071                 if ((context->latency_min < 0.0) || (context->latency_min > latency))
1072                         context->latency_min = latency;
1073
1074 #if USE_NCURSES
1075                 if (has_colors () == TRUE)
1076                 {
1077                         int color = OPING_GREEN;
1078                         double average = context_get_average (context);
1079                         double stddev = context_get_stddev (context);
1080
1081                         if ((latency < (average - (2 * stddev)))
1082                                         || (latency > (average + (2 * stddev))))
1083                                 color = OPING_RED;
1084                         else if ((latency < (average - stddev))
1085                                         || (latency > (average + stddev)))
1086                                 color = OPING_YELLOW;
1087
1088                         HOST_PRINTF ("%zu bytes from %s (%s): icmp_seq=%u ttl=%i ",
1089                                         data_len, context->host, context->addr,
1090                                         sequence, recv_ttl,
1091                                         format_qos (recv_qos, recv_qos_str, sizeof (recv_qos_str)));
1092                         if ((recv_qos != 0) || (opt_send_qos != 0))
1093                         {
1094                                 HOST_PRINTF ("qos=%s ",
1095                                                 format_qos (recv_qos, recv_qos_str, sizeof (recv_qos_str)));
1096                         }
1097                         HOST_PRINTF ("time=");
1098                         wattron (main_win, COLOR_PAIR(color));
1099                         HOST_PRINTF ("%.2f", latency);
1100                         wattroff (main_win, COLOR_PAIR(color));
1101                         HOST_PRINTF (" ms\n");
1102                 }
1103                 else
1104                 {
1105 #endif
1106                 HOST_PRINTF ("%zu bytes from %s (%s): icmp_seq=%u ttl=%i ",
1107                                 data_len,
1108                                 context->host, context->addr,
1109                                 sequence, recv_ttl);
1110                 if ((recv_qos != 0) || (opt_send_qos != 0))
1111                 {
1112                         HOST_PRINTF ("qos=%s ",
1113                                         format_qos (recv_qos, recv_qos_str, sizeof (recv_qos_str)));
1114                 }
1115                 HOST_PRINTF ("time=%.2f ms\n", latency);
1116 #if USE_NCURSES
1117                 }
1118 #endif
1119         }
1120         else
1121         {
1122 #if USE_NCURSES
1123                 if (has_colors () == TRUE)
1124                 {
1125                         HOST_PRINTF ("echo reply from %s (%s): icmp_seq=%u ",
1126                                         context->host, context->addr,
1127                                         sequence);
1128                         wattron (main_win, COLOR_PAIR(OPING_RED) | A_BOLD);
1129                         HOST_PRINTF ("timeout");
1130                         wattroff (main_win, COLOR_PAIR(OPING_RED) | A_BOLD);
1131                         HOST_PRINTF ("\n");
1132                 }
1133                 else
1134                 {
1135 #endif
1136                 HOST_PRINTF ("echo reply from %s (%s): icmp_seq=%u timeout\n",
1137                                 context->host, context->addr,
1138                                 sequence);
1139 #if USE_NCURSES
1140                 }
1141 #endif
1142         }
1143
1144 #if USE_NCURSES
1145         update_stats_from_context (context, iter);
1146         wrefresh (main_win);
1147 #endif
1148 } /* }}} void update_host_hook */
1149
1150 /* Prints statistics for each host, cleans up the contexts and returns the
1151  * number of hosts which failed to return more than the fraction
1152  * opt_exit_status_threshold of pings. */
1153 static int post_loop_hook (pingobj_t *ping) /* {{{ */
1154 {
1155         pingobj_iter_t *iter;
1156         int failure_count = 0;
1157
1158 #if USE_NCURSES
1159         endwin ();
1160 #endif
1161
1162         for (iter = ping_iterator_get (ping);
1163                         iter != NULL;
1164                         iter = ping_iterator_next (iter))
1165         {
1166                 ping_context_t *context;
1167
1168                 context = ping_iterator_get_context (iter);
1169
1170                 printf ("\n--- %s ping statistics ---\n"
1171                                 "%i packets transmitted, %i received, %.2f%% packet loss, time %.1fms\n",
1172                                 context->host, context->req_sent, context->req_rcvd,
1173                                 context_get_packet_loss (context),
1174                                 context->latency_total);
1175
1176                 {
1177                         double pct_failed = 1.0 - (((double) context->req_rcvd)
1178                                         / ((double) context->req_sent));
1179                         if (pct_failed > opt_exit_status_threshold)
1180                                 failure_count++;
1181                 }
1182
1183                 if (context->req_rcvd != 0)
1184                 {
1185                         double average;
1186                         double deviation;
1187
1188                         average = context_get_average (context);
1189                         deviation = context_get_stddev (context);
1190
1191                         printf ("rtt min/avg/max/sdev = %.3f/%.3f/%.3f/%.3f ms\n",
1192                                         context->latency_min,
1193                                         average,
1194                                         context->latency_max,
1195                                         deviation);
1196                 }
1197
1198                 ping_iterator_set_context (iter, NULL);
1199                 context_destroy (context);
1200         }
1201
1202         return (failure_count);
1203 } /* }}} int post_loop_hook */
1204
1205 int main (int argc, char **argv) /* {{{ */
1206 {
1207         pingobj_t      *ping;
1208         pingobj_iter_t *iter;
1209
1210         struct sigaction sigint_action;
1211
1212         struct timeval  tv_begin;
1213         struct timeval  tv_end;
1214         struct timespec ts_wait;
1215         struct timespec ts_int;
1216
1217         int optind;
1218         int i;
1219         int status;
1220 #if _POSIX_SAVED_IDS
1221         uid_t saved_set_uid;
1222
1223         /* Save the old effective user id */
1224         saved_set_uid = geteuid ();
1225         /* Set the effective user ID to the real user ID without changing the
1226          * saved set-user ID */
1227         status = seteuid (getuid ());
1228         if (status != 0)
1229         {
1230                 fprintf (stderr, "Temporarily dropping privileges "
1231                                 "failed: %s\n", strerror (errno));
1232                 exit (EXIT_FAILURE);
1233         }
1234 #endif
1235
1236         setlocale(LC_ALL, "");
1237         optind = read_options (argc, argv);
1238
1239 #if !_POSIX_SAVED_IDS
1240         /* Cannot temporarily drop privileges -> reject every file but "-". */
1241         if ((opt_filename != NULL)
1242                         && (strcmp ("-", opt_filename) != 0)
1243                         && (getuid () != geteuid ()))
1244         {
1245                 fprintf (stderr, "Your real and effective user IDs don't "
1246                                 "match. Reading from a file (option '-f')\n"
1247                                 "is therefore too risky. You can still read "
1248                                 "from STDIN using '-f -' if you like.\n"
1249                                 "Sorry.\n");
1250                 exit (EXIT_FAILURE);
1251         }
1252 #endif
1253
1254         if ((optind >= argc) && (opt_filename == NULL)) {
1255                 usage_exit (argv[0], 1);
1256         }
1257
1258         if ((ping = ping_construct ()) == NULL)
1259         {
1260                 fprintf (stderr, "ping_construct failed\n");
1261                 return (1);
1262         }
1263
1264         if (ping_setopt (ping, PING_OPT_TTL, &opt_send_ttl) != 0)
1265         {
1266                 fprintf (stderr, "Setting TTL to %i failed: %s\n",
1267                                 opt_send_ttl, ping_get_error (ping));
1268         }
1269
1270         if (ping_setopt (ping, PING_OPT_QOS, &opt_send_qos) != 0)
1271         {
1272                 fprintf (stderr, "Setting TOS to %i failed: %s\n",
1273                                 opt_send_qos, ping_get_error (ping));
1274         }
1275
1276         {
1277                 double temp_sec;
1278                 double temp_nsec;
1279
1280                 temp_nsec = modf (opt_interval, &temp_sec);
1281                 ts_int.tv_sec  = (time_t) temp_sec;
1282                 ts_int.tv_nsec = (long) (temp_nsec * 1000000000L);
1283
1284                 /* printf ("ts_int = %i.%09li\n", (int) ts_int.tv_sec, ts_int.tv_nsec); */
1285         }
1286
1287         if (opt_addrfamily != PING_DEF_AF)
1288                 ping_setopt (ping, PING_OPT_AF, (void *) &opt_addrfamily);
1289
1290         if (opt_srcaddr != NULL)
1291         {
1292                 if (ping_setopt (ping, PING_OPT_SOURCE, (void *) opt_srcaddr) != 0)
1293                 {
1294                         fprintf (stderr, "Setting source address failed: %s\n",
1295                                         ping_get_error (ping));
1296                 }
1297         }
1298
1299         if (opt_device != NULL)
1300         {
1301                 if (ping_setopt (ping, PING_OPT_DEVICE, (void *) opt_device) != 0)
1302                 {
1303                         fprintf (stderr, "Setting device failed: %s\n",
1304                                         ping_get_error (ping));
1305                 }
1306         }
1307
1308         if (opt_filename != NULL)
1309         {
1310                 FILE *infile;
1311                 char line[256];
1312                 char host[256];
1313
1314                 if (strcmp (opt_filename, "-") == 0)
1315                         /* Open STDIN */
1316                         infile = fdopen(0, "r");
1317                 else
1318                         infile = fopen(opt_filename, "r");
1319
1320                 if (infile == NULL)
1321                 {
1322                         fprintf (stderr, "Opening %s failed: %s\n",
1323                                         (strcmp (opt_filename, "-") == 0)
1324                                         ? "STDIN" : opt_filename,
1325                                         strerror(errno));
1326                         return (1);
1327                 }
1328
1329 #if _POSIX_SAVED_IDS
1330                 /* Regain privileges */
1331                 status = seteuid (saved_set_uid);
1332                 if (status != 0)
1333                 {
1334                         fprintf (stderr, "Temporarily re-gaining privileges "
1335                                         "failed: %s\n", strerror (errno));
1336                         exit (EXIT_FAILURE);
1337                 }
1338 #endif
1339
1340                 while (fgets(line, sizeof(line), infile))
1341                 {
1342                         /* Strip whitespace */
1343                         if (sscanf(line, "%s", host) != 1)
1344                                 continue;
1345
1346                         if ((host[0] == 0) || (host[0] == '#'))
1347                                 continue;
1348
1349                         if (ping_host_add(ping, host) < 0)
1350                         {
1351                                 const char *errmsg = ping_get_error (ping);
1352
1353                                 fprintf (stderr, "Adding host `%s' failed: %s\n", host, errmsg);
1354                                 continue;
1355                         }
1356                         else
1357                         {
1358                                 host_num++;
1359                         }
1360                 }
1361
1362 #if _POSIX_SAVED_IDS
1363                 /* Drop privileges */
1364                 status = seteuid (getuid ());
1365                 if (status != 0)
1366                 {
1367                         fprintf (stderr, "Temporarily dropping privileges "
1368                                         "failed: %s\n", strerror (errno));
1369                         exit (EXIT_FAILURE);
1370                 }
1371 #endif
1372
1373                 fclose(infile);
1374         }
1375
1376 #if _POSIX_SAVED_IDS
1377         /* Regain privileges */
1378         status = seteuid (saved_set_uid);
1379         if (status != 0)
1380         {
1381                 fprintf (stderr, "Temporarily re-gaining privileges "
1382                                 "failed: %s\n", strerror (errno));
1383                 exit (EXIT_FAILURE);
1384         }
1385 #endif
1386
1387         for (i = optind; i < argc; i++)
1388         {
1389                 if (ping_host_add (ping, argv[i]) < 0)
1390                 {
1391                         const char *errmsg = ping_get_error (ping);
1392
1393                         fprintf (stderr, "Adding host `%s' failed: %s\n", argv[i], errmsg);
1394                         continue;
1395                 }
1396                 else
1397                 {
1398                         host_num++;
1399                 }
1400         }
1401
1402         /* Permanently drop root privileges if we're setuid-root. */
1403         status = setuid (getuid ());
1404         if (status != 0)
1405         {
1406                 fprintf (stderr, "Dropping privileges failed: %s\n",
1407                                 strerror (errno));
1408                 exit (EXIT_FAILURE);
1409         }
1410
1411 #if _POSIX_SAVED_IDS
1412         saved_set_uid = (uid_t) -1;
1413 #endif
1414
1415         ping_initialize_contexts (ping);
1416
1417         if (i == 0)
1418                 return (1);
1419
1420         memset (&sigint_action, '\0', sizeof (sigint_action));
1421         sigint_action.sa_handler = sigint_handler;
1422         if (sigaction (SIGINT, &sigint_action, NULL) < 0)
1423         {
1424                 perror ("sigaction");
1425                 return (1);
1426         }
1427
1428         pre_loop_hook (ping);
1429
1430         while (opt_count != 0)
1431         {
1432                 int index;
1433                 int status;
1434
1435                 if (gettimeofday (&tv_begin, NULL) < 0)
1436                 {
1437                         perror ("gettimeofday");
1438                         return (1);
1439                 }
1440
1441                 status = ping_send (ping);
1442                 if (status == -EINTR)
1443                 {
1444                         continue;
1445                 }
1446                 else if (status < 0)
1447                 {
1448                         fprintf (stderr, "ping_send failed: %s\n",
1449                                         ping_get_error (ping));
1450                         return (1);
1451                 }
1452
1453                 index = 0;
1454                 for (iter = ping_iterator_get (ping);
1455                                 iter != NULL;
1456                                 iter = ping_iterator_next (iter))
1457                 {
1458                         update_host_hook (iter, index);
1459                         index++;
1460                 }
1461
1462                 pre_sleep_hook (ping);
1463
1464                 /* Don't sleep in the last iteration */
1465                 if (opt_count == 1)
1466                         break;
1467
1468                 if (gettimeofday (&tv_end, NULL) < 0)
1469                 {
1470                         perror ("gettimeofday");
1471                         return (1);
1472                 }
1473
1474                 time_calc (&ts_wait, &ts_int, &tv_begin, &tv_end);
1475
1476                 /* printf ("Sleeping for %i.%09li seconds\n", (int) ts_wait.tv_sec, ts_wait.tv_nsec); */
1477                 while ((status = nanosleep (&ts_wait, &ts_wait)) != 0)
1478                 {
1479                         if (errno == EINTR)
1480                         {
1481                                 continue;
1482                         }
1483                         else
1484                         {
1485                                 perror ("nanosleep");
1486                                 break;
1487                         }
1488                 }
1489
1490                 post_sleep_hook (ping);
1491
1492                 if (opt_count > 0)
1493                         opt_count--;
1494         } /* while (opt_count != 0) */
1495
1496         /* Returns the number of failed hosts according to -Z. */
1497         status = post_loop_hook (ping);
1498
1499         ping_destroy (ping);
1500
1501         if (status == 0)
1502                 exit (EXIT_SUCCESS);
1503         else
1504         {
1505                 if (status > 255)
1506                         status = 255;
1507                 exit (status);
1508         }
1509 } /* }}} int main */
1510
1511 /* vim: set fdm=marker : */