src/oping.c

   1 /**
   2  * Object oriented C module to send ICMP and ICMPv6 `echo's.
   3  * Copyright (C) 2006-2010  Florian octo Forster <octo at verplant.org>
   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 <errno.h>
  29 # include <assert.h>
  30 #else
  31 # error "You don't have the standard C99 header files installed"
  32 #endif /* STDC_HEADERS */
  33
  34 #if HAVE_UNISTD_H
  35 # include <unistd.h>
  36 #endif
  37
  38 #if HAVE_MATH_H
  39 # include <math.h>
  40 #endif
  41
  42 #if TIME_WITH_SYS_TIME
  43 # include <sys/time.h>
  44 # include <time.h>
  45 #else
  46 # if HAVE_SYS_TIME_H
  47 #  include <sys/time.h>
  48 # else
  49 #  include <time.h>
  50 # endif
  51 #endif
  52
  53 #if HAVE_NETDB_H
  54 # include <netdb.h> /* NI_MAXHOST */
  55 #endif
  56
  57 #if HAVE_SIGNAL_H
  58 # include <signal.h>
  59 #endif
  60
  61 #if HAVE_SYS_TYPES_H
  62 #include <sys/types.h>
  63 #endif
  64
  65 #if USE_NCURSES
  66 # include <ncurses.h>
  67 #endif
  68
  69 #include "oping.h"
  70
  71 #ifndef _POSIX_SAVED_IDS
  72 # define _POSIX_SAVED_IDS 0
  73 #endif
  74
  75 typedef struct ping_context
  76 {
  77         char host[NI_MAXHOST];
  78         char addr[NI_MAXHOST];
  79
  80         int req_sent;
  81         int req_rcvd;
  82
  83         double latency_min;
  84         double latency_max;
  85         double latency_total;
  86         double latency_total_square;
  87
  88 #if USE_NCURSES
  89         WINDOW *window;
  90 #endif
  91 } ping_context_t;
  92
  93 static double  opt_interval   = 1.0;
  94 static int     opt_addrfamily = PING_DEF_AF;
  95 static char   *opt_srcaddr    = NULL;
  96 static char   *opt_device     = NULL;
  97 static char   *opt_filename   = NULL;
  98 static int     opt_count      = -1;
  99 static int     opt_send_ttl   = 64;
 100
 101 #if USE_NCURSES
 102 static WINDOW *main_win = NULL;
 103 #endif
 104
 105 static void sigint_handler (int signal) /* {{{ */
 106 {
 107         /* Make compiler happy */
 108         signal = 0;
 109         /* Exit the loop */
 110         opt_count = 0;
 111 } /* }}} void sigint_handler */
 112
 113 static ping_context_t *context_create (void)
 114 {
 115         ping_context_t *ret;
 116
 117         if ((ret = malloc (sizeof (ping_context_t))) == NULL)
 118                 return (NULL);
 119
 120         memset (ret, '\0', sizeof (ping_context_t));
 121
 122         ret->latency_min   = -1.0;
 123         ret->latency_max   = -1.0;
 124         ret->latency_total = 0.0;
 125         ret->latency_total_square = 0.0;
 126
 127 #if USE_NCURSES
 128         ret->window = NULL;
 129 #endif
 130
 131         return (ret);
 132 }
 133
 134 static void context_destroy (ping_context_t *context)
 135 {
 136         if (context == NULL)
 137                 return;
 138
 139 #if USE_NCURSES
 140         if (context->window != NULL)
 141         {
 142                 delwin (context->window);
 143                 context->window = NULL;
 144         }
 145 #endif
 146
 147         free (context);
 148 }
 149
 150 static double context_get_average (ping_context_t *ctx) /* {{{ */
 151 {
 152         double num_total;
 153
 154         if (ctx == NULL)
 155                 return (-1.0);
 156
 157         if (ctx->req_rcvd < 1)
 158                 return (-0.0);
 159
 160         num_total = (double) ctx->req_rcvd;
 161         return (ctx->latency_total / num_total);
 162 } /* }}} double context_get_average */
 163
 164 static double context_get_stddev (ping_context_t *ctx) /* {{{ */
 165 {
 166         double num_total;
 167
 168         if (ctx == NULL)
 169                 return (-1.0);
 170
 171         if (ctx->req_rcvd < 1)
 172                 return (-0.0);
 173         else if (ctx->req_rcvd < 2)
 174                 return (0.0);
 175
 176         num_total = (double) ctx->req_rcvd;
 177         return (sqrt (((num_total * ctx->latency_total_square)
 178                                         - (ctx->latency_total * ctx->latency_total))
 179                                 / (num_total * (num_total - 1.0))));
 180 } /* }}} double context_get_stddev */
 181
 182 static double context_get_packet_loss (const ping_context_t *ctx) /* {{{ */
 183 {
 184         if (ctx == NULL)
 185                 return (-1.0);
 186
 187         if (ctx->req_sent < 1)
 188                 return (0.0);
 189
 190         return (100.0 * (ctx->req_sent - ctx->req_rcvd)
 191                         / ((double) ctx->req_sent));
 192 } /* }}} double context_get_packet_loss */
 193
 194 static void usage_exit (const char *name, int status)
 195 {
 196         int name_length;
 197
 198         name_length = (int) strlen (name);
 199
 200         fprintf (stderr, "Usage: %s [OPTIONS] "
 201                                 "-f filename | host [host [host ...]]\n"
 202
 203                         "\nAvailable options:\n"
 204                         "  -4|-6        force the use of IPv4 or IPv6\n"
 205                         "  -c count     number of ICMP packets to send\n"
 206                         "  -i interval  interval with which to send ICMP packets\n"
 207                         "  -t ttl       time to live for each ICMP packet\n"
 208                         "  -I srcaddr   source address\n"
 209                         "  -D device    outgoing interface name\n"
 210                         "  -f filename  filename to read hosts from\n"
 211
 212                         "\noping "PACKAGE_VERSION", http://verplant.org/liboping/\n"
 213                         "by Florian octo Forster <octo@verplant.org>\n"
 214                         "for contributions see `AUTHORS'\n",
 215                         name);
 216         exit (status);
 217 }
 218
 219 static int read_options (int argc, char **argv) /* {{{ */
 220 {
 221         int optchar;
 222
 223         while (1)
 224         {
 225                 optchar = getopt (argc, argv, "46c:hi:I:t:f:D:");
 226
 227                 if (optchar == -1)
 228                         break;
 229
 230                 switch (optchar)
 231                 {
 232                         case '4':
 233                         case '6':
 234                                 opt_addrfamily = (optchar == '4') ? AF_INET : AF_INET6;
 235                                 break;
 236
 237                         case 'c':
 238                                 {
 239                                         int new_count;
 240                                         new_count = atoi (optarg);
 241                                         if (new_count > 0)
 242                                                 opt_count = new_count;
 243                                         else
 244                                                 fprintf(stderr, "Ignoring invalid count: %s\n",
 245                                                                 optarg);
 246                                 }
 247                                 break;
 248
 249                         case 'f':
 250                                 {
 251                                         if (opt_filename != NULL)
 252                                                 free (opt_filename);
 253                                         opt_filename = strdup (optarg);
 254                                 }
 255                                 break;
 256
 257                         case 'i':
 258                                 {
 259                                         double new_interval;
 260                                         new_interval = atof (optarg);
 261                                         if (new_interval < 0.001)
 262                                                 fprintf (stderr, "Ignoring invalid interval: %s\n",
 263                                                                 optarg);
 264                                         else
 265                                                 opt_interval = new_interval;
 266                                 }
 267                                 break;
 268                         case 'I':
 269                                 {
 270                                         if (opt_srcaddr != NULL)
 271                                                 free (opt_srcaddr);
 272                                         opt_srcaddr = strdup (optarg);
 273                                 }
 274                                 break;
 275
 276                         case 'D':
 277                                 opt_device = optarg;
 278                                 break;
 279
 280                         case 't':
 281                         {
 282                                 int new_send_ttl;
 283                                 new_send_ttl = atoi (optarg);
 284                                 if ((new_send_ttl > 0) && (new_send_ttl < 256))
 285                                         opt_send_ttl = new_send_ttl;
 286                                 else
 287                                         fprintf (stderr, "Ignoring invalid TTL argument: %s\n",
 288                                                         optarg);
 289                                 break;
 290                         }
 291
 292                         case 'h':
 293                                 usage_exit (argv[0], 0);
 294                                 break;
 295                         default:
 296                                 usage_exit (argv[0], 1);
 297                 }
 298         }
 299
 300         return (optind);
 301 } /* }}} read_options */
 302
 303 static void time_normalize (struct timespec *ts) /* {{{ */
 304 {
 305         while (ts->tv_nsec < 0)
 306         {
 307                 if (ts->tv_sec == 0)
 308                 {
 309                         ts->tv_nsec = 0;
 310                         return;
 311                 }
 312
 313                 ts->tv_sec  -= 1;
 314                 ts->tv_nsec += 1000000000;
 315         }
 316
 317         while (ts->tv_nsec >= 1000000000)
 318         {
 319                 ts->tv_sec  += 1;
 320                 ts->tv_nsec -= 1000000000;
 321         }
 322 } /* }}} void time_normalize */
 323
 324 static void time_calc (struct timespec *ts_dest, /* {{{ */
 325                 const struct timespec *ts_int,
 326                 const struct timeval  *tv_begin,
 327                 const struct timeval  *tv_end)
 328 {
 329         ts_dest->tv_sec = tv_begin->tv_sec + ts_int->tv_sec;
 330         ts_dest->tv_nsec = (tv_begin->tv_usec * 1000) + ts_int->tv_nsec;
 331         time_normalize (ts_dest);
 332
 333         /* Assure that `(begin + interval) > end'.
 334          * This may seem overly complicated, but `tv_sec' is of type `time_t'
 335          * which may be `unsigned. *sigh* */
 336         if ((tv_end->tv_sec > ts_dest->tv_sec)
 337                         || ((tv_end->tv_sec == ts_dest->tv_sec)
 338                                 && ((tv_end->tv_usec * 1000) > ts_dest->tv_nsec)))
 339         {
 340                 ts_dest->tv_sec  = 0;
 341                 ts_dest->tv_nsec = 0;
 342                 return;
 343         }
 344
 345         ts_dest->tv_sec = ts_dest->tv_sec - tv_end->tv_sec;
 346         ts_dest->tv_nsec = ts_dest->tv_nsec - (tv_end->tv_usec * 1000);
 347         time_normalize (ts_dest);
 348 } /* }}} void time_calc */
 349
 350 #if USE_NCURSES
 351 static int context_window_repaint (ping_context_t *ctx, /* {{{ */
 352                 int index)
 353 {
 354         if (ctx == NULL)
 355                 return (EINVAL);
 356
 357         if (ctx->window == NULL)
 358         {
 359                 ctx->window = newwin (/* height = */ 4, /* width = */ 0,
 360                                 /* start y = */ 4 * index, /* start x = */ 0);
 361         }
 362         else /* if (ctx->window != NULL) */
 363         {
 364                 werase (ctx->window);
 365         }
 366
 367         box (ctx->window, 0, 0);
 368         mvwprintw (ctx->window, /* y = */ 0, /* x = */ 5,
 369                         " %s ping statistics ",
 370                         ctx->host);
 371         mvwprintw (ctx->window, /* y = */ 1, /* x = */ 2,
 372                         "%i packets transmitted, %i received, %.2f%% packet "
 373                         "loss, time %.1fms",
 374                         ctx->req_sent, ctx->req_rcvd,
 375                         context_get_packet_loss (ctx),
 376                         ctx->latency_total);
 377         if (ctx->req_rcvd != 0)
 378         {
 379                 double average;
 380                 double deviation;
 381
 382                 average = context_get_average (ctx);
 383                 deviation = context_get_stddev (ctx);
 384
 385                 mvwprintw (ctx->window, /* y = */ 2, /* x = */ 2,
 386                                 "rtt min/avg/max/sdev = %.3f/%.3f/%.3f/%.3f ms",
 387                                 ctx->latency_min,
 388                                 average,
 389                                 ctx->latency_max,
 390                                 deviation);
 391         }
 392
 393         wrefresh (ctx->window);
 394
 395         return (0);
 396 } /* }}} int context_window_repaint */
 397
 398 static int resize_windows (pingobj_t *ping) /* {{{ */
 399 {
 400         int index;
 401         pingobj_iter_t *iter;
 402         int width = 0;
 403         int height = 0;
 404         int need_resize = 0;
 405
 406         while (42)
 407         {
 408                 int key = wgetch (stdscr);
 409                 if (key == ERR)
 410                         break;
 411                 else if (key == KEY_RESIZE)
 412                         need_resize = 1;
 413         }
 414
 415         if (!need_resize)
 416                 return (0);
 417
 418         getmaxyx (stdscr, height, width);
 419         if ((height < 1) || (width < 1))
 420                 return (EINVAL);
 421
 422         index = 0;
 423         for (iter = ping_iterator_get (ping);
 424                         iter != NULL;
 425                         iter = ping_iterator_next (iter))
 426         {
 427                 ping_context_t *ctx = ping_iterator_get_context (iter);
 428
 429                 if (ctx->window == NULL)
 430                 {
 431                         index++;
 432                         continue;
 433                 }
 434
 435                 wresize (ctx->window, 4, width);
 436                 context_window_repaint (ctx, index);
 437
 438                 index++;
 439         }
 440
 441         if (main_win != NULL)
 442         {
 443                 wresize (main_win, height - (4 * index), width);
 444                 /* touchwin (main_win); */
 445                 /* wrefresh (main_win); */
 446                 clearok (main_win, TRUE);
 447         }
 448
 449         return (0);
 450 } /* }}} int resize_windows */
 451 #endif
 452
 453 static void print_host (pingobj_iter_t *iter, /* {{{ */
 454                 int index)
 455 {
 456         double          latency;
 457         unsigned int    sequence;
 458         int             recv_ttl;
 459         size_t          buffer_len;
 460         size_t          data_len;
 461         ping_context_t *context;
 462
 463         latency = -1.0;
 464         buffer_len = sizeof (latency);
 465         ping_iterator_get_info (iter, PING_INFO_LATENCY,
 466                         &latency, &buffer_len);
 467
 468         sequence = 0;
 469         buffer_len = sizeof (sequence);
 470         ping_iterator_get_info (iter, PING_INFO_SEQUENCE,
 471                         &sequence, &buffer_len);
 472
 473         recv_ttl = -1;
 474         buffer_len = sizeof (recv_ttl);
 475         ping_iterator_get_info (iter, PING_INFO_RECV_TTL,
 476                         &recv_ttl, &buffer_len);
 477
 478         data_len = 0;
 479         ping_iterator_get_info (iter, PING_INFO_DATA,
 480                         NULL, &data_len);
 481
 482         context = (ping_context_t *) ping_iterator_get_context (iter);
 483
 484 #if USE_NCURSES
 485 # define HOST_PRINTF(...) wprintw(main_win, __VA_ARGS__)
 486 #else
 487 # define HOST_PRINTF(...) printf(__VA_ARGS__)
 488 #endif
 489
 490         context->req_sent++;
 491         if (latency > 0.0)
 492         {
 493                 context->req_rcvd++;
 494                 context->latency_total += latency;
 495                 context->latency_total_square += (latency * latency);
 496
 497                 if ((context->latency_max < 0.0) || (context->latency_max < latency))
 498                         context->latency_max = latency;
 499                 if ((context->latency_min < 0.0) || (context->latency_min > latency))
 500                         context->latency_min = latency;
 501
 502                 HOST_PRINTF ("%zu bytes from %s (%s): icmp_seq=%u ttl=%i "
 503                                 "time=%.2f ms\n",
 504                                 data_len,
 505                                 context->host, context->addr,
 506                                 sequence, recv_ttl, latency);
 507         }
 508         else
 509         {
 510                 HOST_PRINTF ("echo reply from %s (%s): icmp_seq=%u timeout\n",
 511                                 context->host, context->addr,
 512                                 sequence);
 513         }
 514
 515 #if USE_NCURSES
 516         context_window_repaint (context, index);
 517         wrefresh (main_win);
 518 #endif
 519 } /* }}} void print_host */
 520
 521 static int print_header (pingobj_t *ping) /* {{{ */
 522 {
 523         pingobj_iter_t *iter;
 524         int index;
 525
 526 #if USE_NCURSES
 527         initscr ();
 528         cbreak ();
 529         noecho ();
 530         nodelay (stdscr, TRUE);
 531 #endif
 532
 533         index = 0;
 534         for (iter = ping_iterator_get (ping);
 535                         iter != NULL;
 536                         iter = ping_iterator_next (iter))
 537         {
 538                 ping_context_t *context;
 539                 size_t buffer_size;
 540
 541                 context = context_create ();
 542
 543                 buffer_size = sizeof (context->host);
 544                 ping_iterator_get_info (iter, PING_INFO_HOSTNAME, context->host, &buffer_size);
 545
 546                 buffer_size = sizeof (context->addr);
 547                 ping_iterator_get_info (iter, PING_INFO_ADDRESS, context->addr, &buffer_size);
 548
 549                 buffer_size = 0;
 550                 ping_iterator_get_info (iter, PING_INFO_DATA, NULL, &buffer_size);
 551
 552 #if USE_NCURSES
 553                 context_window_repaint (context, index);
 554 #else /* !USE_NCURSES */
 555                 printf ("PING %s (%s) %zu bytes of data.\n",
 556                                 context->host, context->addr, buffer_size);
 557 #endif
 558
 559                 ping_iterator_set_context (iter, (void *) context);
 560
 561                 index++;
 562         }
 563
 564 #if USE_NCURSES
 565         main_win = newwin (/* height = */ 0, /* width = */ 0,
 566                         /* y = */ 4 * index, /* x = */ 0);
 567         /* Allow scrolling */
 568         scrollok (main_win, TRUE);
 569         /* Allow hardware accelerated scrolling. */
 570         idlok (main_win, TRUE);
 571
 572         /* Don't know what good this does exactly, but without this code
 573          * "resize_windows" will be called right after startup and *somehow*
 574          * this leads to display errors. If we purge all initial characters
 575          * here, the problem goes away. "wgetch" is non-blocking due to
 576          * "nodelay" (see above). */
 577         while (wgetch (stdscr) != ERR)
 578         {
 579                 /* eat up characters */;
 580         }
 581 #endif
 582
 583         return (0);
 584 } /* }}} int print_header */
 585
 586 static int print_footer (pingobj_t *ping) /* {{{ */
 587 {
 588         pingobj_iter_t *iter;
 589
 590 #if USE_NCURSES
 591         endwin ();
 592 #endif
 593
 594         for (iter = ping_iterator_get (ping);
 595                         iter != NULL;
 596                         iter = ping_iterator_next (iter))
 597         {
 598                 ping_context_t *context;
 599
 600                 context = ping_iterator_get_context (iter);
 601
 602                 printf ("\n--- %s ping statistics ---\n"
 603                                 "%i packets transmitted, %i received, %.2f%% packet loss, time %.1fms\n",
 604                                 context->host, context->req_sent, context->req_rcvd,
 605                                 context_get_packet_loss (context),
 606                                 context->latency_total);
 607
 608                 if (context->req_rcvd != 0)
 609                 {
 610                         double average;
 611                         double deviation;
 612
 613                         average = context_get_average (context);
 614                         deviation = context_get_stddev (context);
 615
 616                         printf ("rtt min/avg/max/sdev = %.3f/%.3f/%.3f/%.3f ms\n",
 617                                         context->latency_min,
 618                                         average,
 619                                         context->latency_max,
 620                                         deviation);
 621                 }
 622
 623                 ping_iterator_set_context (iter, NULL);
 624                 context_destroy (context);
 625         }
 626
 627         return (0);
 628 } /* }}} int print_footer */
 629
 630 int main (int argc, char **argv) /* {{{ */
 631 {
 632         pingobj_t      *ping;
 633         pingobj_iter_t *iter;
 634
 635         struct sigaction sigint_action;
 636
 637         struct timeval  tv_begin;
 638         struct timeval  tv_end;
 639         struct timespec ts_wait;
 640         struct timespec ts_int;
 641
 642         int optind;
 643         int i;
 644         int status;
 645 #if _POSIX_SAVED_IDS
 646         uid_t saved_set_uid;
 647
 648         /* Save the old effective user id */
 649         saved_set_uid = geteuid ();
 650         /* Set the effective user ID to the real user ID without changing the
 651          * saved set-user ID */
 652         status = seteuid (getuid ());
 653         if (status != 0)
 654         {
 655                 fprintf (stderr, "Temporarily dropping privileges "
 656                                 "failed: %s\n", strerror (errno));
 657                 exit (EXIT_FAILURE);
 658         }
 659 #endif
 660
 661         optind = read_options (argc, argv);
 662
 663 #if !_POSIX_SAVED_IDS
 664         /* Cannot temporarily drop privileges -> reject every file but "-". */
 665         if ((opt_filename != NULL)
 666                         && (strcmp ("-", opt_filename) != 0)
 667                         && (getuid () != geteuid ()))
 668         {
 669                 fprintf (stderr, "Your real and effective user IDs don't "
 670                                 "match. Reading from a file (option '-f')\n"
 671                                 "is therefore too risky. You can still read "
 672                                 "from STDIN using '-f -' if you like.\n"
 673                                 "Sorry.\n");
 674                 exit (EXIT_FAILURE);
 675         }
 676 #endif
 677
 678         if ((optind >= argc) && (opt_filename == NULL)) {
 679                 usage_exit (argv[0], 1);
 680         }
 681
 682         if ((ping = ping_construct ()) == NULL)
 683         {
 684                 fprintf (stderr, "ping_construct failed\n");
 685                 return (1);
 686         }
 687
 688         if (ping_setopt (ping, PING_OPT_TTL, &opt_send_ttl) != 0)
 689         {
 690                 fprintf (stderr, "Setting TTL to %i failed: %s\n",
 691                                 opt_send_ttl, ping_get_error (ping));
 692         }
 693
 694         {
 695                 double temp_sec;
 696                 double temp_nsec;
 697
 698                 temp_nsec = modf (opt_interval, &temp_sec);
 699                 ts_int.tv_sec  = (time_t) temp_sec;
 700                 ts_int.tv_nsec = (long) (temp_nsec * 1000000000L);
 701
 702                 /* printf ("ts_int = %i.%09li\n", (int) ts_int.tv_sec, ts_int.tv_nsec); */
 703         }
 704
 705         if (opt_addrfamily != PING_DEF_AF)
 706                 ping_setopt (ping, PING_OPT_AF, (void *) &opt_addrfamily);
 707
 708         if (opt_srcaddr != NULL)
 709         {
 710                 if (ping_setopt (ping, PING_OPT_SOURCE, (void *) opt_srcaddr) != 0)
 711                 {
 712                         fprintf (stderr, "Setting source address failed: %s\n",
 713                                         ping_get_error (ping));
 714                 }
 715         }
 716
 717         if (opt_device != NULL)
 718         {
 719                 if (ping_setopt (ping, PING_OPT_DEVICE, (void *) opt_device) != 0)
 720                 {
 721                         fprintf (stderr, "Setting device failed: %s\n",
 722                                         ping_get_error (ping));
 723                 }
 724         }
 725
 726         if (opt_filename != NULL)
 727         {
 728                 FILE *infile;
 729                 char line[256];
 730                 char host[256];
 731
 732                 if (strcmp (opt_filename, "-") == 0)
 733                         /* Open STDIN */
 734                         infile = fdopen(0, "r");
 735                 else
 736                         infile = fopen(opt_filename, "r");
 737
 738                 if (infile == NULL)
 739                 {
 740                         fprintf (stderr, "Opening %s failed: %s\n",
 741                                         (strcmp (opt_filename, "-") == 0)
 742                                         ? "STDIN" : opt_filename,
 743                                         strerror(errno));
 744                         return (1);
 745                 }
 746
 747 #if _POSIX_SAVED_IDS
 748                 /* Regain privileges */
 749                 status = seteuid (saved_set_uid);
 750                 if (status != 0)
 751                 {
 752                         fprintf (stderr, "Temporarily re-gaining privileges "
 753                                         "failed: %s\n", strerror (errno));
 754                         exit (EXIT_FAILURE);
 755                 }
 756 #endif
 757
 758                 while (fgets(line, sizeof(line), infile))
 759                 {
 760                         /* Strip whitespace */
 761                         if (sscanf(line, "%s", host) != 1)
 762                                 continue;
 763
 764                         if ((host[0] == 0) || (host[0] == '#'))
 765                                 continue;
 766
 767                         if (ping_host_add(ping, host) < 0)
 768                         {
 769                                 const char *errmsg = ping_get_error (ping);
 770
 771                                 fprintf (stderr, "Adding host `%s' failed: %s\n", host, errmsg);
 772                                 continue;
 773                         }
 774                 }
 775
 776 #if _POSIX_SAVED_IDS
 777                 /* Drop privileges */
 778                 status = seteuid (getuid ());
 779                 if (status != 0)
 780                 {
 781                         fprintf (stderr, "Temporarily dropping privileges "
 782                                         "failed: %s\n", strerror (errno));
 783                         exit (EXIT_FAILURE);
 784                 }
 785 #endif
 786
 787                 fclose(infile);
 788         }
 789
 790 #if _POSIX_SAVED_IDS
 791         /* Regain privileges */
 792         status = seteuid (saved_set_uid);
 793         if (status != 0)
 794         {
 795                 fprintf (stderr, "Temporarily re-gaining privileges "
 796                                 "failed: %s\n", strerror (errno));
 797                 exit (EXIT_FAILURE);
 798         }
 799 #endif
 800
 801         for (i = optind; i < argc; i++)
 802         {
 803                 if (ping_host_add (ping, argv[i]) < 0)
 804                 {
 805                         const char *errmsg = ping_get_error (ping);
 806
 807                         fprintf (stderr, "Adding host `%s' failed: %s\n", argv[i], errmsg);
 808                         continue;
 809                 }
 810         }
 811
 812         /* Permanently drop root privileges if we're setuid-root. */
 813         status = setuid (getuid ());
 814         if (status != 0)
 815         {
 816                 fprintf (stderr, "Dropping privileges failed: %s\n",
 817                                 strerror (errno));
 818                 exit (EXIT_FAILURE);
 819         }
 820
 821 #if _POSIX_SAVED_IDS
 822         saved_set_uid = (uid_t) -1;
 823 #endif
 824
 825         print_header (ping);
 826
 827         if (i == 0)
 828                 return (1);
 829
 830         memset (&sigint_action, '\0', sizeof (sigint_action));
 831         sigint_action.sa_handler = sigint_handler;
 832         if (sigaction (SIGINT, &sigint_action, NULL) < 0)
 833         {
 834                 perror ("sigaction");
 835                 return (1);
 836         }
 837
 838         while (opt_count != 0)
 839         {
 840                 int index;
 841                 int status;
 842
 843                 if (gettimeofday (&tv_begin, NULL) < 0)
 844                 {
 845                         perror ("gettimeofday");
 846                         return (1);
 847                 }
 848
 849                 if (ping_send (ping) < 0)
 850                 {
 851                         fprintf (stderr, "ping_send failed: %s\n",
 852                                         ping_get_error (ping));
 853                         return (1);
 854                 }
 855
 856                 index = 0;
 857                 for (iter = ping_iterator_get (ping);
 858                                 iter != NULL;
 859                                 iter = ping_iterator_next (iter))
 860                 {
 861                         print_host (iter, index);
 862                         index++;
 863                 }
 864 #if !USE_NCURSES
 865                 fflush (stdout);
 866 #endif
 867
 868                 /* Don't sleep in the last iteration */
 869                 if (opt_count == 1)
 870                         break;
 871
 872                 if (gettimeofday (&tv_end, NULL) < 0)
 873                 {
 874                         perror ("gettimeofday");
 875                         return (1);
 876                 }
 877
 878                 time_calc (&ts_wait, &ts_int, &tv_begin, &tv_end);
 879
 880                 /* printf ("Sleeping for %i.%09li seconds\n", (int) ts_wait.tv_sec, ts_wait.tv_nsec); */
 881                 while ((status = nanosleep (&ts_wait, &ts_wait)) != 0)
 882                 {
 883                         if (errno != EINTR)
 884                         {
 885                                 perror ("nanosleep");
 886                                 break;
 887                         }
 888                         else if (opt_count == 0)
 889                         {
 890                                 /* sigint */
 891                                 break;
 892                         }
 893
 894 #if USE_NCURSES
 895                         resize_windows (ping);
 896 #endif
 897                 }
 898
 899 #if USE_NCURSES
 900                 resize_windows (ping);
 901 #endif
 902
 903                 if (opt_count > 0)
 904                         opt_count--;
 905         } /* while (opt_count != 0) */
 906
 907         print_footer (ping);
 908
 909         ping_destroy (ping);
 910
 911         return (0);
 912 } /* }}} int main */
 913
 914 /* vim: set fdm=marker : */