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         wattron (ctx->window, A_BOLD);
 369         mvwprintw (ctx->window, /* y = */ 0, /* x = */ 5,
 370                         " %s ", ctx->host);
 371         wattroff (ctx->window, A_BOLD);
 372         wprintw (ctx->window, "ping statistics ");
 373         mvwprintw (ctx->window, /* y = */ 1, /* x = */ 2,
 374                         "%i packets transmitted, %i received, %.2f%% packet "
 375                         "loss, time %.1fms",
 376                         ctx->req_sent, ctx->req_rcvd,
 377                         context_get_packet_loss (ctx),
 378                         ctx->latency_total);
 379         if (ctx->req_rcvd != 0)
 380         {
 381                 double average;
 382                 double deviation;
 383
 384                 average = context_get_average (ctx);
 385                 deviation = context_get_stddev (ctx);
 386
 387                 mvwprintw (ctx->window, /* y = */ 2, /* x = */ 2,
 388                                 "rtt min/avg/max/sdev = %.3f/%.3f/%.3f/%.3f ms",
 389                                 ctx->latency_min,
 390                                 average,
 391                                 ctx->latency_max,
 392                                 deviation);
 393         }
 394
 395         wrefresh (ctx->window);
 396
 397         return (0);
 398 } /* }}} int context_window_repaint */
 399
 400 static int resize_windows (pingobj_t *ping) /* {{{ */
 401 {
 402         int index;
 403         pingobj_iter_t *iter;
 404         int width = 0;
 405         int height = 0;
 406         int need_resize = 0;
 407
 408         while (42)
 409         {
 410                 int key = wgetch (stdscr);
 411                 if (key == ERR)
 412                         break;
 413                 else if (key == KEY_RESIZE)
 414                         need_resize = 1;
 415         }
 416
 417         if (!need_resize)
 418                 return (0);
 419
 420         getmaxyx (stdscr, height, width);
 421         if ((height < 1) || (width < 1))
 422                 return (EINVAL);
 423
 424         index = 0;
 425         for (iter = ping_iterator_get (ping);
 426                         iter != NULL;
 427                         iter = ping_iterator_next (iter))
 428         {
 429                 ping_context_t *ctx = ping_iterator_get_context (iter);
 430
 431                 if (ctx->window == NULL)
 432                 {
 433                         index++;
 434                         continue;
 435                 }
 436
 437                 wresize (ctx->window, 4, width);
 438                 context_window_repaint (ctx, index);
 439
 440                 index++;
 441         }
 442
 443         if (main_win != NULL)
 444         {
 445                 wresize (main_win, height - (4 * index), width);
 446                 /* touchwin (main_win); */
 447                 /* wrefresh (main_win); */
 448                 clearok (main_win, TRUE);
 449         }
 450
 451         return (0);
 452 } /* }}} int resize_windows */
 453 #endif
 454
 455 static void print_host (pingobj_iter_t *iter, /* {{{ */
 456                 int index)
 457 {
 458         double          latency;
 459         unsigned int    sequence;
 460         int             recv_ttl;
 461         size_t          buffer_len;
 462         size_t          data_len;
 463         ping_context_t *context;
 464
 465         latency = -1.0;
 466         buffer_len = sizeof (latency);
 467         ping_iterator_get_info (iter, PING_INFO_LATENCY,
 468                         &latency, &buffer_len);
 469
 470         sequence = 0;
 471         buffer_len = sizeof (sequence);
 472         ping_iterator_get_info (iter, PING_INFO_SEQUENCE,
 473                         &sequence, &buffer_len);
 474
 475         recv_ttl = -1;
 476         buffer_len = sizeof (recv_ttl);
 477         ping_iterator_get_info (iter, PING_INFO_RECV_TTL,
 478                         &recv_ttl, &buffer_len);
 479
 480         data_len = 0;
 481         ping_iterator_get_info (iter, PING_INFO_DATA,
 482                         NULL, &data_len);
 483
 484         context = (ping_context_t *) ping_iterator_get_context (iter);
 485
 486 #if USE_NCURSES
 487 # define HOST_PRINTF(...) wprintw(main_win, __VA_ARGS__)
 488 #else
 489 # define HOST_PRINTF(...) printf(__VA_ARGS__)
 490 #endif
 491
 492         context->req_sent++;
 493         if (latency > 0.0)
 494         {
 495                 context->req_rcvd++;
 496                 context->latency_total += latency;
 497                 context->latency_total_square += (latency * latency);
 498
 499                 if ((context->latency_max < 0.0) || (context->latency_max < latency))
 500                         context->latency_max = latency;
 501                 if ((context->latency_min < 0.0) || (context->latency_min > latency))
 502                         context->latency_min = latency;
 503
 504                 HOST_PRINTF ("%zu bytes from %s (%s): icmp_seq=%u ttl=%i "
 505                                 "time=%.2f ms\n",
 506                                 data_len,
 507                                 context->host, context->addr,
 508                                 sequence, recv_ttl, latency);
 509         }
 510         else
 511         {
 512                 HOST_PRINTF ("echo reply from %s (%s): icmp_seq=%u timeout\n",
 513                                 context->host, context->addr,
 514                                 sequence);
 515         }
 516
 517 #if USE_NCURSES
 518         context_window_repaint (context, index);
 519         wrefresh (main_win);
 520 #endif
 521 } /* }}} void print_host */
 522
 523 static int print_header (pingobj_t *ping) /* {{{ */
 524 {
 525         pingobj_iter_t *iter;
 526         int index;
 527
 528 #if USE_NCURSES
 529         initscr ();
 530         cbreak ();
 531         noecho ();
 532         nodelay (stdscr, TRUE);
 533 #endif
 534
 535         index = 0;
 536         for (iter = ping_iterator_get (ping);
 537                         iter != NULL;
 538                         iter = ping_iterator_next (iter))
 539         {
 540                 ping_context_t *context;
 541                 size_t buffer_size;
 542
 543                 context = context_create ();
 544
 545                 buffer_size = sizeof (context->host);
 546                 ping_iterator_get_info (iter, PING_INFO_HOSTNAME, context->host, &buffer_size);
 547
 548                 buffer_size = sizeof (context->addr);
 549                 ping_iterator_get_info (iter, PING_INFO_ADDRESS, context->addr, &buffer_size);
 550
 551                 buffer_size = 0;
 552                 ping_iterator_get_info (iter, PING_INFO_DATA, NULL, &buffer_size);
 553
 554 #if USE_NCURSES
 555                 context_window_repaint (context, index);
 556 #else /* !USE_NCURSES */
 557                 printf ("PING %s (%s) %zu bytes of data.\n",
 558                                 context->host, context->addr, buffer_size);
 559 #endif
 560
 561                 ping_iterator_set_context (iter, (void *) context);
 562
 563                 index++;
 564         }
 565
 566 #if USE_NCURSES
 567         main_win = newwin (/* height = */ 0, /* width = */ 0,
 568                         /* y = */ 4 * index, /* x = */ 0);
 569         /* Allow scrolling */
 570         scrollok (main_win, TRUE);
 571         /* Allow hardware accelerated scrolling. */
 572         idlok (main_win, TRUE);
 573
 574         /* Don't know what good this does exactly, but without this code
 575          * "resize_windows" will be called right after startup and *somehow*
 576          * this leads to display errors. If we purge all initial characters
 577          * here, the problem goes away. "wgetch" is non-blocking due to
 578          * "nodelay" (see above). */
 579         while (wgetch (stdscr) != ERR)
 580         {
 581                 /* eat up characters */;
 582         }
 583 #endif
 584
 585         return (0);
 586 } /* }}} int print_header */
 587
 588 static int print_footer (pingobj_t *ping) /* {{{ */
 589 {
 590         pingobj_iter_t *iter;
 591
 592 #if USE_NCURSES
 593         endwin ();
 594 #endif
 595
 596         for (iter = ping_iterator_get (ping);
 597                         iter != NULL;
 598                         iter = ping_iterator_next (iter))
 599         {
 600                 ping_context_t *context;
 601
 602                 context = ping_iterator_get_context (iter);
 603
 604                 printf ("\n--- %s ping statistics ---\n"
 605                                 "%i packets transmitted, %i received, %.2f%% packet loss, time %.1fms\n",
 606                                 context->host, context->req_sent, context->req_rcvd,
 607                                 context_get_packet_loss (context),
 608                                 context->latency_total);
 609
 610                 if (context->req_rcvd != 0)
 611                 {
 612                         double average;
 613                         double deviation;
 614
 615                         average = context_get_average (context);
 616                         deviation = context_get_stddev (context);
 617
 618                         printf ("rtt min/avg/max/sdev = %.3f/%.3f/%.3f/%.3f ms\n",
 619                                         context->latency_min,
 620                                         average,
 621                                         context->latency_max,
 622                                         deviation);
 623                 }
 624
 625                 ping_iterator_set_context (iter, NULL);
 626                 context_destroy (context);
 627         }
 628
 629         return (0);
 630 } /* }}} int print_footer */
 631
 632 int main (int argc, char **argv) /* {{{ */
 633 {
 634         pingobj_t      *ping;
 635         pingobj_iter_t *iter;
 636
 637         struct sigaction sigint_action;
 638
 639         struct timeval  tv_begin;
 640         struct timeval  tv_end;
 641         struct timespec ts_wait;
 642         struct timespec ts_int;
 643
 644         int optind;
 645         int i;
 646         int status;
 647 #if _POSIX_SAVED_IDS
 648         uid_t saved_set_uid;
 649
 650         /* Save the old effective user id */
 651         saved_set_uid = geteuid ();
 652         /* Set the effective user ID to the real user ID without changing the
 653          * saved set-user ID */
 654         status = seteuid (getuid ());
 655         if (status != 0)
 656         {
 657                 fprintf (stderr, "Temporarily dropping privileges "
 658                                 "failed: %s\n", strerror (errno));
 659                 exit (EXIT_FAILURE);
 660         }
 661 #endif
 662
 663         optind = read_options (argc, argv);
 664
 665 #if !_POSIX_SAVED_IDS
 666         /* Cannot temporarily drop privileges -> reject every file but "-". */
 667         if ((opt_filename != NULL)
 668                         && (strcmp ("-", opt_filename) != 0)
 669                         && (getuid () != geteuid ()))
 670         {
 671                 fprintf (stderr, "Your real and effective user IDs don't "
 672                                 "match. Reading from a file (option '-f')\n"
 673                                 "is therefore too risky. You can still read "
 674                                 "from STDIN using '-f -' if you like.\n"
 675                                 "Sorry.\n");
 676                 exit (EXIT_FAILURE);
 677         }
 678 #endif
 679
 680         if ((optind >= argc) && (opt_filename == NULL)) {
 681                 usage_exit (argv[0], 1);
 682         }
 683
 684         if ((ping = ping_construct ()) == NULL)
 685         {
 686                 fprintf (stderr, "ping_construct failed\n");
 687                 return (1);
 688         }
 689
 690         if (ping_setopt (ping, PING_OPT_TTL, &opt_send_ttl) != 0)
 691         {
 692                 fprintf (stderr, "Setting TTL to %i failed: %s\n",
 693                                 opt_send_ttl, ping_get_error (ping));
 694         }
 695
 696         {
 697                 double temp_sec;
 698                 double temp_nsec;
 699
 700                 temp_nsec = modf (opt_interval, &temp_sec);
 701                 ts_int.tv_sec  = (time_t) temp_sec;
 702                 ts_int.tv_nsec = (long) (temp_nsec * 1000000000L);
 703
 704                 /* printf ("ts_int = %i.%09li\n", (int) ts_int.tv_sec, ts_int.tv_nsec); */
 705         }
 706
 707         if (opt_addrfamily != PING_DEF_AF)
 708                 ping_setopt (ping, PING_OPT_AF, (void *) &opt_addrfamily);
 709
 710         if (opt_srcaddr != NULL)
 711         {
 712                 if (ping_setopt (ping, PING_OPT_SOURCE, (void *) opt_srcaddr) != 0)
 713                 {
 714                         fprintf (stderr, "Setting source address failed: %s\n",
 715                                         ping_get_error (ping));
 716                 }
 717         }
 718
 719         if (opt_device != NULL)
 720         {
 721                 if (ping_setopt (ping, PING_OPT_DEVICE, (void *) opt_device) != 0)
 722                 {
 723                         fprintf (stderr, "Setting device failed: %s\n",
 724                                         ping_get_error (ping));
 725                 }
 726         }
 727
 728         if (opt_filename != NULL)
 729         {
 730                 FILE *infile;
 731                 char line[256];
 732                 char host[256];
 733
 734                 if (strcmp (opt_filename, "-") == 0)
 735                         /* Open STDIN */
 736                         infile = fdopen(0, "r");
 737                 else
 738                         infile = fopen(opt_filename, "r");
 739
 740                 if (infile == NULL)
 741                 {
 742                         fprintf (stderr, "Opening %s failed: %s\n",
 743                                         (strcmp (opt_filename, "-") == 0)
 744                                         ? "STDIN" : opt_filename,
 745                                         strerror(errno));
 746                         return (1);
 747                 }
 748
 749 #if _POSIX_SAVED_IDS
 750                 /* Regain privileges */
 751                 status = seteuid (saved_set_uid);
 752                 if (status != 0)
 753                 {
 754                         fprintf (stderr, "Temporarily re-gaining privileges "
 755                                         "failed: %s\n", strerror (errno));
 756                         exit (EXIT_FAILURE);
 757                 }
 758 #endif
 759
 760                 while (fgets(line, sizeof(line), infile))
 761                 {
 762                         /* Strip whitespace */
 763                         if (sscanf(line, "%s", host) != 1)
 764                                 continue;
 765
 766                         if ((host[0] == 0) || (host[0] == '#'))
 767                                 continue;
 768
 769                         if (ping_host_add(ping, host) < 0)
 770                         {
 771                                 const char *errmsg = ping_get_error (ping);
 772
 773                                 fprintf (stderr, "Adding host `%s' failed: %s\n", host, errmsg);
 774                                 continue;
 775                         }
 776                 }
 777
 778 #if _POSIX_SAVED_IDS
 779                 /* Drop privileges */
 780                 status = seteuid (getuid ());
 781                 if (status != 0)
 782                 {
 783                         fprintf (stderr, "Temporarily dropping privileges "
 784                                         "failed: %s\n", strerror (errno));
 785                         exit (EXIT_FAILURE);
 786                 }
 787 #endif
 788
 789                 fclose(infile);
 790         }
 791
 792 #if _POSIX_SAVED_IDS
 793         /* Regain privileges */
 794         status = seteuid (saved_set_uid);
 795         if (status != 0)
 796         {
 797                 fprintf (stderr, "Temporarily re-gaining privileges "
 798                                 "failed: %s\n", strerror (errno));
 799                 exit (EXIT_FAILURE);
 800         }
 801 #endif
 802
 803         for (i = optind; i < argc; i++)
 804         {
 805                 if (ping_host_add (ping, argv[i]) < 0)
 806                 {
 807                         const char *errmsg = ping_get_error (ping);
 808
 809                         fprintf (stderr, "Adding host `%s' failed: %s\n", argv[i], errmsg);
 810                         continue;
 811                 }
 812         }
 813
 814         /* Permanently drop root privileges if we're setuid-root. */
 815         status = setuid (getuid ());
 816         if (status != 0)
 817         {
 818                 fprintf (stderr, "Dropping privileges failed: %s\n",
 819                                 strerror (errno));
 820                 exit (EXIT_FAILURE);
 821         }
 822
 823 #if _POSIX_SAVED_IDS
 824         saved_set_uid = (uid_t) -1;
 825 #endif
 826
 827         print_header (ping);
 828
 829         if (i == 0)
 830                 return (1);
 831
 832         memset (&sigint_action, '\0', sizeof (sigint_action));
 833         sigint_action.sa_handler = sigint_handler;
 834         if (sigaction (SIGINT, &sigint_action, NULL) < 0)
 835         {
 836                 perror ("sigaction");
 837                 return (1);
 838         }
 839
 840         while (opt_count != 0)
 841         {
 842                 int index;
 843                 int status;
 844
 845                 if (gettimeofday (&tv_begin, NULL) < 0)
 846                 {
 847                         perror ("gettimeofday");
 848                         return (1);
 849                 }
 850
 851                 if (ping_send (ping) < 0)
 852                 {
 853                         fprintf (stderr, "ping_send failed: %s\n",
 854                                         ping_get_error (ping));
 855                         return (1);
 856                 }
 857
 858                 index = 0;
 859                 for (iter = ping_iterator_get (ping);
 860                                 iter != NULL;
 861                                 iter = ping_iterator_next (iter))
 862                 {
 863                         print_host (iter, index);
 864                         index++;
 865                 }
 866 #if !USE_NCURSES
 867                 fflush (stdout);
 868 #endif
 869
 870                 /* Don't sleep in the last iteration */
 871                 if (opt_count == 1)
 872                         break;
 873
 874                 if (gettimeofday (&tv_end, NULL) < 0)
 875                 {
 876                         perror ("gettimeofday");
 877                         return (1);
 878                 }
 879
 880                 time_calc (&ts_wait, &ts_int, &tv_begin, &tv_end);
 881
 882                 /* printf ("Sleeping for %i.%09li seconds\n", (int) ts_wait.tv_sec, ts_wait.tv_nsec); */
 883                 while ((status = nanosleep (&ts_wait, &ts_wait)) != 0)
 884                 {
 885                         if (errno != EINTR)
 886                         {
 887                                 perror ("nanosleep");
 888                                 break;
 889                         }
 890                         else if (opt_count == 0)
 891                         {
 892                                 /* sigint */
 893                                 break;
 894                         }
 895
 896 #if USE_NCURSES
 897                         resize_windows (ping);
 898 #endif
 899                 }
 900
 901 #if USE_NCURSES
 902                 resize_windows (ping);
 903 #endif
 904
 905                 if (opt_count > 0)
 906                         opt_count--;
 907         } /* while (opt_count != 0) */
 908
 909         print_footer (ping);
 910
 911         ping_destroy (ping);
 912
 913         return (0);
 914 } /* }}} int main */
 915
 916 /* vim: set fdm=marker : */