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 # define NCURSES_OPAQUE 1
  67 # include <ncurses.h>
  68
  69 # define OPING_GREEN 1
  70 # define OPING_YELLOW 2
  71 # define OPING_RED 3
  72 #endif
  73
  74 #include "oping.h"
  75
  76 #ifndef _POSIX_SAVED_IDS
  77 # define _POSIX_SAVED_IDS 0
  78 #endif
  79
  80 typedef struct ping_context
  81 {
  82         char host[NI_MAXHOST];
  83         char addr[NI_MAXHOST];
  84
  85         int index;
  86         int req_sent;
  87         int req_rcvd;
  88
  89         double latency_min;
  90         double latency_max;
  91         double latency_total;
  92         double latency_total_square;
  93
  94 #if USE_NCURSES
  95         WINDOW *window;
  96 #endif
  97 } ping_context_t;
  98
  99 static double  opt_interval   = 1.0;
 100 static int     opt_addrfamily = PING_DEF_AF;
 101 static char   *opt_srcaddr    = NULL;
 102 static char   *opt_device     = NULL;
 103 static char   *opt_filename   = NULL;
 104 static int     opt_count      = -1;
 105 static int     opt_send_ttl   = 64;
 106
 107 static int host_num = 0;
 108
 109 #if USE_NCURSES
 110 static WINDOW *main_win = NULL;
 111 #endif
 112
 113 static void sigint_handler (int signal) /* {{{ */
 114 {
 115         /* Make compiler happy */
 116         signal = 0;
 117         /* Exit the loop */
 118         opt_count = 0;
 119 } /* }}} void sigint_handler */
 120
 121 static ping_context_t *context_create (void) /* {{{ */
 122 {
 123         ping_context_t *ret;
 124
 125         if ((ret = malloc (sizeof (ping_context_t))) == NULL)
 126                 return (NULL);
 127
 128         memset (ret, '\0', sizeof (ping_context_t));
 129
 130         ret->latency_min   = -1.0;
 131         ret->latency_max   = -1.0;
 132         ret->latency_total = 0.0;
 133         ret->latency_total_square = 0.0;
 134
 135 #if USE_NCURSES
 136         ret->window = NULL;
 137 #endif
 138
 139         return (ret);
 140 } /* }}} ping_context_t *context_create */
 141
 142 static void context_destroy (ping_context_t *context) /* {{{ */
 143 {
 144         if (context == NULL)
 145                 return;
 146
 147 #if USE_NCURSES
 148         if (context->window != NULL)
 149         {
 150                 delwin (context->window);
 151                 context->window = NULL;
 152         }
 153 #endif
 154
 155         free (context);
 156 } /* }}} void context_destroy */
 157
 158 static double context_get_average (ping_context_t *ctx) /* {{{ */
 159 {
 160         double num_total;
 161
 162         if (ctx == NULL)
 163                 return (-1.0);
 164
 165         if (ctx->req_rcvd < 1)
 166                 return (-0.0);
 167
 168         num_total = (double) ctx->req_rcvd;
 169         return (ctx->latency_total / num_total);
 170 } /* }}} double context_get_average */
 171
 172 static double context_get_stddev (ping_context_t *ctx) /* {{{ */
 173 {
 174         double num_total;
 175
 176         if (ctx == NULL)
 177                 return (-1.0);
 178
 179         if (ctx->req_rcvd < 1)
 180                 return (-0.0);
 181         else if (ctx->req_rcvd < 2)
 182                 return (0.0);
 183
 184         num_total = (double) ctx->req_rcvd;
 185         return (sqrt (((num_total * ctx->latency_total_square)
 186                                         - (ctx->latency_total * ctx->latency_total))
 187                                 / (num_total * (num_total - 1.0))));
 188 } /* }}} double context_get_stddev */
 189
 190 static double context_get_packet_loss (const ping_context_t *ctx) /* {{{ */
 191 {
 192         if (ctx == NULL)
 193                 return (-1.0);
 194
 195         if (ctx->req_sent < 1)
 196                 return (0.0);
 197
 198         return (100.0 * (ctx->req_sent - ctx->req_rcvd)
 199                         / ((double) ctx->req_sent));
 200 } /* }}} double context_get_packet_loss */
 201
 202 static int ping_initialize_contexts (pingobj_t *ping) /* {{{ */
 203 {
 204         pingobj_iter_t *iter;
 205         int index;
 206
 207         if (ping == NULL)
 208                 return (EINVAL);
 209
 210         index = 0;
 211         for (iter = ping_iterator_get (ping);
 212                         iter != NULL;
 213                         iter = ping_iterator_next (iter))
 214         {
 215                 ping_context_t *context;
 216                 size_t buffer_size;
 217
 218                 context = context_create ();
 219                 context->index = index;
 220
 221                 buffer_size = sizeof (context->host);
 222                 ping_iterator_get_info (iter, PING_INFO_HOSTNAME, context->host, &buffer_size);
 223
 224                 buffer_size = sizeof (context->addr);
 225                 ping_iterator_get_info (iter, PING_INFO_ADDRESS, context->addr, &buffer_size);
 226
 227                 ping_iterator_set_context (iter, (void *) context);
 228
 229                 index++;
 230         }
 231
 232         return (0);
 233 } /* }}} int ping_initialize_contexts */
 234
 235 static void usage_exit (const char *name, int status) /* {{{ */
 236 {
 237         fprintf (stderr, "Usage: %s [OPTIONS] "
 238                                 "-f filename | host [host [host ...]]\n"
 239
 240                         "\nAvailable options:\n"
 241                         "  -4|-6        force the use of IPv4 or IPv6\n"
 242                         "  -c count     number of ICMP packets to send\n"
 243                         "  -i interval  interval with which to send ICMP packets\n"
 244                         "  -t ttl       time to live for each ICMP packet\n"
 245                         "  -I srcaddr   source address\n"
 246                         "  -D device    outgoing interface name\n"
 247                         "  -f filename  filename to read hosts from\n"
 248
 249                         "\noping "PACKAGE_VERSION", http://verplant.org/liboping/\n"
 250                         "by Florian octo Forster <octo@verplant.org>\n"
 251                         "for contributions see `AUTHORS'\n",
 252                         name);
 253         exit (status);
 254 } /* }}} void usage_exit */
 255
 256 static int read_options (int argc, char **argv) /* {{{ */
 257 {
 258         int optchar;
 259
 260         while (1)
 261         {
 262                 optchar = getopt (argc, argv, "46c:hi:I:t:f:D:");
 263
 264                 if (optchar == -1)
 265                         break;
 266
 267                 switch (optchar)
 268                 {
 269                         case '4':
 270                         case '6':
 271                                 opt_addrfamily = (optchar == '4') ? AF_INET : AF_INET6;
 272                                 break;
 273
 274                         case 'c':
 275                                 {
 276                                         int new_count;
 277                                         new_count = atoi (optarg);
 278                                         if (new_count > 0)
 279                                                 opt_count = new_count;
 280                                         else
 281                                                 fprintf(stderr, "Ignoring invalid count: %s\n",
 282                                                                 optarg);
 283                                 }
 284                                 break;
 285
 286                         case 'f':
 287                                 {
 288                                         if (opt_filename != NULL)
 289                                                 free (opt_filename);
 290                                         opt_filename = strdup (optarg);
 291                                 }
 292                                 break;
 293
 294                         case 'i':
 295                                 {
 296                                         double new_interval;
 297                                         new_interval = atof (optarg);
 298                                         if (new_interval < 0.001)
 299                                                 fprintf (stderr, "Ignoring invalid interval: %s\n",
 300                                                                 optarg);
 301                                         else
 302                                                 opt_interval = new_interval;
 303                                 }
 304                                 break;
 305                         case 'I':
 306                                 {
 307                                         if (opt_srcaddr != NULL)
 308                                                 free (opt_srcaddr);
 309                                         opt_srcaddr = strdup (optarg);
 310                                 }
 311                                 break;
 312
 313                         case 'D':
 314                                 opt_device = optarg;
 315                                 break;
 316
 317                         case 't':
 318                         {
 319                                 int new_send_ttl;
 320                                 new_send_ttl = atoi (optarg);
 321                                 if ((new_send_ttl > 0) && (new_send_ttl < 256))
 322                                         opt_send_ttl = new_send_ttl;
 323                                 else
 324                                         fprintf (stderr, "Ignoring invalid TTL argument: %s\n",
 325                                                         optarg);
 326                                 break;
 327                         }
 328
 329                         case 'h':
 330                                 usage_exit (argv[0], 0);
 331                                 break;
 332                         default:
 333                                 usage_exit (argv[0], 1);
 334                 }
 335         }
 336
 337         return (optind);
 338 } /* }}} read_options */
 339
 340 static void time_normalize (struct timespec *ts) /* {{{ */
 341 {
 342         while (ts->tv_nsec < 0)
 343         {
 344                 if (ts->tv_sec == 0)
 345                 {
 346                         ts->tv_nsec = 0;
 347                         return;
 348                 }
 349
 350                 ts->tv_sec  -= 1;
 351                 ts->tv_nsec += 1000000000;
 352         }
 353
 354         while (ts->tv_nsec >= 1000000000)
 355         {
 356                 ts->tv_sec  += 1;
 357                 ts->tv_nsec -= 1000000000;
 358         }
 359 } /* }}} void time_normalize */
 360
 361 static void time_calc (struct timespec *ts_dest, /* {{{ */
 362                 const struct timespec *ts_int,
 363                 const struct timeval  *tv_begin,
 364                 const struct timeval  *tv_end)
 365 {
 366         ts_dest->tv_sec = tv_begin->tv_sec + ts_int->tv_sec;
 367         ts_dest->tv_nsec = (tv_begin->tv_usec * 1000) + ts_int->tv_nsec;
 368         time_normalize (ts_dest);
 369
 370         /* Assure that `(begin + interval) > end'.
 371          * This may seem overly complicated, but `tv_sec' is of type `time_t'
 372          * which may be `unsigned. *sigh* */
 373         if ((tv_end->tv_sec > ts_dest->tv_sec)
 374                         || ((tv_end->tv_sec == ts_dest->tv_sec)
 375                                 && ((tv_end->tv_usec * 1000) > ts_dest->tv_nsec)))
 376         {
 377                 ts_dest->tv_sec  = 0;
 378                 ts_dest->tv_nsec = 0;
 379                 return;
 380         }
 381
 382         ts_dest->tv_sec = ts_dest->tv_sec - tv_end->tv_sec;
 383         ts_dest->tv_nsec = ts_dest->tv_nsec - (tv_end->tv_usec * 1000);
 384         time_normalize (ts_dest);
 385 } /* }}} void time_calc */
 386
 387 #if USE_NCURSES
 388 static int update_stats_from_context (ping_context_t *ctx) /* {{{ */
 389 {
 390         if ((ctx == NULL) || (ctx->window == NULL))
 391                 return (EINVAL);
 392
 393         werase (ctx->window);
 394
 395         box (ctx->window, 0, 0);
 396         wattron (ctx->window, A_BOLD);
 397         mvwprintw (ctx->window, /* y = */ 0, /* x = */ 5,
 398                         " %s ", ctx->host);
 399         wattroff (ctx->window, A_BOLD);
 400         wprintw (ctx->window, "ping statistics ");
 401         mvwprintw (ctx->window, /* y = */ 1, /* x = */ 2,
 402                         "%i packets transmitted, %i received, %.2f%% packet "
 403                         "loss, time %.1fms",
 404                         ctx->req_sent, ctx->req_rcvd,
 405                         context_get_packet_loss (ctx),
 406                         ctx->latency_total);
 407         if (ctx->req_rcvd != 0)
 408         {
 409                 double average;
 410                 double deviation;
 411
 412                 average = context_get_average (ctx);
 413                 deviation = context_get_stddev (ctx);
 414
 415                 mvwprintw (ctx->window, /* y = */ 2, /* x = */ 2,
 416                                 "rtt min/avg/max/sdev = %.3f/%.3f/%.3f/%.3f ms",
 417                                 ctx->latency_min,
 418                                 average,
 419                                 ctx->latency_max,
 420                                 deviation);
 421         }
 422
 423         wrefresh (ctx->window);
 424
 425         return (0);
 426 } /* }}} int update_stats_from_context */
 427
 428 static int on_resize (pingobj_t *ping) /* {{{ */
 429 {
 430         pingobj_iter_t *iter;
 431         int width = 0;
 432         int height = 0;
 433         int main_win_height;
 434
 435         getmaxyx (stdscr, height, width);
 436         if ((height < 1) || (width < 1))
 437                 return (EINVAL);
 438
 439         main_win_height = height - (4 * host_num);
 440         wresize (main_win, main_win_height, /* width = */ width);
 441         /* Allow scrolling */
 442         scrollok (main_win, TRUE);
 443         /* wsetscrreg (main_win, 0, main_win_height - 1); */
 444         /* Allow hardware accelerated scrolling. */
 445         idlok (main_win, TRUE);
 446         wrefresh (main_win);
 447
 448         for (iter = ping_iterator_get (ping);
 449                         iter != NULL;
 450                         iter = ping_iterator_next (iter))
 451         {
 452                 ping_context_t *context;
 453
 454                 context = ping_iterator_get_context (iter);
 455                 if (context == NULL)
 456                         continue;
 457
 458                 if (context->window != NULL)
 459                 {
 460                         delwin (context->window);
 461                         context->window = NULL;
 462                 }
 463                 context->window = newwin (/* height = */ 4,
 464                                 /* width = */ 0,
 465                                 /* y = */ main_win_height + (4 * context->index),
 466                                 /* x = */ 0);
 467         }
 468
 469         return (0);
 470 } /* }}} */
 471
 472 static int check_resize (pingobj_t *ping) /* {{{ */
 473 {
 474         int need_resize = 0;
 475
 476         while (42)
 477         {
 478                 int key = wgetch (stdscr);
 479                 if (key == ERR)
 480                         break;
 481                 else if (key == KEY_RESIZE)
 482                         need_resize = 1;
 483         }
 484
 485         if (need_resize)
 486                 return (on_resize (ping));
 487         else
 488                 return (0);
 489 } /* }}} int check_resize */
 490
 491 static int pre_loop_hook (pingobj_t *ping) /* {{{ */
 492 {
 493         pingobj_iter_t *iter;
 494         int width = 0;
 495         int height = 0;
 496         int main_win_height;
 497
 498         initscr ();
 499         cbreak ();
 500         noecho ();
 501         nodelay (stdscr, TRUE);
 502
 503         getmaxyx (stdscr, height, width);
 504         if ((height < 1) || (width < 1))
 505                 return (EINVAL);
 506
 507         if (has_colors () == TRUE)
 508         {
 509                 start_color ();
 510                 init_pair (OPING_GREEN,  COLOR_GREEN,  /* default = */ 0);
 511                 init_pair (OPING_YELLOW, COLOR_YELLOW, /* default = */ 0);
 512                 init_pair (OPING_RED,    COLOR_RED,    /* default = */ 0);
 513         }
 514
 515         main_win_height = height - (4 * host_num);
 516         main_win = newwin (/* height = */ main_win_height,
 517                         /* width = */ 0,
 518                         /* y = */ 0, /* x = */ 0);
 519         /* Allow scrolling */
 520         scrollok (main_win, TRUE);
 521         /* wsetscrreg (main_win, 0, main_win_height - 1); */
 522         /* Allow hardware accelerated scrolling. */
 523         idlok (main_win, TRUE);
 524         wmove (main_win, /* y = */ main_win_height - 1, /* x = */ 0);
 525         wrefresh (main_win);
 526
 527         for (iter = ping_iterator_get (ping);
 528                         iter != NULL;
 529                         iter = ping_iterator_next (iter))
 530         {
 531                 ping_context_t *context;
 532
 533                 context = ping_iterator_get_context (iter);
 534                 if (context == NULL)
 535                         continue;
 536
 537                 if (context->window != NULL)
 538                 {
 539                         delwin (context->window);
 540                         context->window = NULL;
 541                 }
 542                 context->window = newwin (/* height = */ 4,
 543                                 /* width = */ 0,
 544                                 /* y = */ main_win_height + (4 * context->index),
 545                                 /* x = */ 0);
 546         }
 547
 548
 549         /* Don't know what good this does exactly, but without this code
 550          * "check_resize" will be called right after startup and *somehow*
 551          * this leads to display errors. If we purge all initial characters
 552          * here, the problem goes away. "wgetch" is non-blocking due to
 553          * "nodelay" (see above). */
 554         while (wgetch (stdscr) != ERR)
 555         {
 556                 /* eat up characters */;
 557         }
 558
 559         return (0);
 560 } /* }}} int pre_loop_hook */
 561
 562 static int pre_sleep_hook (pingobj_t *ping) /* {{{ */
 563 {
 564         return (check_resize (ping));
 565 } /* }}} int pre_sleep_hook */
 566
 567 static int post_sleep_hook (pingobj_t *ping) /* {{{ */
 568 {
 569         return (check_resize (ping));
 570 } /* }}} int pre_sleep_hook */
 571 #else /* if !USE_NCURSES */
 572 static int pre_loop_hook (pingobj_t *ping) /* {{{ */
 573 {
 574         pingobj_iter_t *iter;
 575
 576         for (iter = ping_iterator_get (ping);
 577                         iter != NULL;
 578                         iter = ping_iterator_next (iter))
 579         {
 580                 ping_context_t *ctx;
 581                 size_t buffer_size;
 582
 583                 ctx = ping_iterator_get_context (iter);
 584                 if (ctx == NULL)
 585                         continue;
 586
 587                 buffer_size = 0;
 588                 ping_iterator_get_info (iter, PING_INFO_DATA, NULL, &buffer_size);
 589
 590                 printf ("PING %s (%s) %zu bytes of data.\n",
 591                                 ctx->host, ctx->addr, buffer_size);
 592         }
 593
 594         return (0);
 595 } /* }}} int pre_loop_hook */
 596
 597 static int pre_sleep_hook (__attribute__((unused)) pingobj_t *ping) /* {{{ */
 598 {
 599         fflush (stdout);
 600
 601         return (0);
 602 } /* }}} int pre_sleep_hook */
 603
 604 static int post_sleep_hook (__attribute__((unused)) pingobj_t *ping) /* {{{ */
 605 {
 606         return (0);
 607 } /* }}} int post_sleep_hook */
 608 #endif
 609
 610 static void update_host_hook (pingobj_iter_t *iter, /* {{{ */
 611                 int index)
 612 {
 613         double          latency;
 614         unsigned int    sequence;
 615         int             recv_ttl;
 616         size_t          buffer_len;
 617         size_t          data_len;
 618         ping_context_t *context;
 619
 620         latency = -1.0;
 621         buffer_len = sizeof (latency);
 622         ping_iterator_get_info (iter, PING_INFO_LATENCY,
 623                         &latency, &buffer_len);
 624
 625         sequence = 0;
 626         buffer_len = sizeof (sequence);
 627         ping_iterator_get_info (iter, PING_INFO_SEQUENCE,
 628                         &sequence, &buffer_len);
 629
 630         recv_ttl = -1;
 631         buffer_len = sizeof (recv_ttl);
 632         ping_iterator_get_info (iter, PING_INFO_RECV_TTL,
 633                         &recv_ttl, &buffer_len);
 634
 635         data_len = 0;
 636         ping_iterator_get_info (iter, PING_INFO_DATA,
 637                         NULL, &data_len);
 638
 639         context = (ping_context_t *) ping_iterator_get_context (iter);
 640
 641 #if USE_NCURSES
 642 # define HOST_PRINTF(...) wprintw(main_win, __VA_ARGS__)
 643 #else
 644 # define HOST_PRINTF(...) printf(__VA_ARGS__)
 645 #endif
 646
 647         context->req_sent++;
 648         if (latency > 0.0)
 649         {
 650                 context->req_rcvd++;
 651                 context->latency_total += latency;
 652                 context->latency_total_square += (latency * latency);
 653
 654                 if ((context->latency_max < 0.0) || (context->latency_max < latency))
 655                         context->latency_max = latency;
 656                 if ((context->latency_min < 0.0) || (context->latency_min > latency))
 657                         context->latency_min = latency;
 658
 659 #if USE_NCURSES
 660                 if (has_colors () == TRUE)
 661                 {
 662                         int color = OPING_GREEN;
 663                         double average = context_get_average (context);
 664                         double stddev = context_get_stddev (context);
 665
 666                         if ((latency < (average - (2 * stddev)))
 667                                         || (latency > (average + (2 * stddev))))
 668                                 color = OPING_RED;
 669                         else if ((latency < (average - stddev))
 670                                         || (latency > (average + stddev)))
 671                                 color = OPING_YELLOW;
 672
 673                         HOST_PRINTF ("%zu bytes from %s (%s): icmp_seq=%u ttl=%i "
 674                                         "time=",
 675                                         data_len, context->host, context->addr,
 676                                         sequence, recv_ttl);
 677                         wattron (main_win, COLOR_PAIR(color));
 678                         HOST_PRINTF ("%.2f", latency);
 679                         wattroff (main_win, COLOR_PAIR(color));
 680                         HOST_PRINTF (" ms\n");
 681                 }
 682                 else
 683                 {
 684 #endif
 685                 HOST_PRINTF ("%zu bytes from %s (%s): icmp_seq=%u ttl=%i "
 686                                 "time=%.2f ms\n",
 687                                 data_len,
 688                                 context->host, context->addr,
 689                                 sequence, recv_ttl, latency);
 690 #if USE_NCURSES
 691                 }
 692 #endif
 693         }
 694         else
 695         {
 696 #if USE_NCURSES
 697                 if (has_colors () == TRUE)
 698                 {
 699                         HOST_PRINTF ("echo reply from %s (%s): icmp_seq=%u ",
 700                                         context->host, context->addr,
 701                                         sequence);
 702                         wattron (main_win, COLOR_PAIR(OPING_RED) | A_BOLD);
 703                         HOST_PRINTF ("timeout");
 704                         wattroff (main_win, COLOR_PAIR(OPING_RED) | A_BOLD);
 705                         HOST_PRINTF ("\n");
 706                 }
 707                 else
 708                 {
 709 #endif
 710                 HOST_PRINTF ("echo reply from %s (%s): icmp_seq=%u timeout\n",
 711                                 context->host, context->addr,
 712                                 sequence);
 713 #if USE_NCURSES
 714                 }
 715 #endif
 716         }
 717
 718 #if USE_NCURSES
 719         update_stats_from_context (context);
 720         wrefresh (main_win);
 721 #endif
 722 } /* }}} void update_host_hook */
 723
 724 static int post_loop_hook (pingobj_t *ping) /* {{{ */
 725 {
 726         pingobj_iter_t *iter;
 727
 728 #if USE_NCURSES
 729         endwin ();
 730 #endif
 731
 732         for (iter = ping_iterator_get (ping);
 733                         iter != NULL;
 734                         iter = ping_iterator_next (iter))
 735         {
 736                 ping_context_t *context;
 737
 738                 context = ping_iterator_get_context (iter);
 739
 740                 printf ("\n--- %s ping statistics ---\n"
 741                                 "%i packets transmitted, %i received, %.2f%% packet loss, time %.1fms\n",
 742                                 context->host, context->req_sent, context->req_rcvd,
 743                                 context_get_packet_loss (context),
 744                                 context->latency_total);
 745
 746                 if (context->req_rcvd != 0)
 747                 {
 748                         double average;
 749                         double deviation;
 750
 751                         average = context_get_average (context);
 752                         deviation = context_get_stddev (context);
 753
 754                         printf ("rtt min/avg/max/sdev = %.3f/%.3f/%.3f/%.3f ms\n",
 755                                         context->latency_min,
 756                                         average,
 757                                         context->latency_max,
 758                                         deviation);
 759                 }
 760
 761                 ping_iterator_set_context (iter, NULL);
 762                 context_destroy (context);
 763         }
 764
 765         return (0);
 766 } /* }}} int post_loop_hook */
 767
 768 int main (int argc, char **argv) /* {{{ */
 769 {
 770         pingobj_t      *ping;
 771         pingobj_iter_t *iter;
 772
 773         struct sigaction sigint_action;
 774
 775         struct timeval  tv_begin;
 776         struct timeval  tv_end;
 777         struct timespec ts_wait;
 778         struct timespec ts_int;
 779
 780         int optind;
 781         int i;
 782         int status;
 783 #if _POSIX_SAVED_IDS
 784         uid_t saved_set_uid;
 785
 786         /* Save the old effective user id */
 787         saved_set_uid = geteuid ();
 788         /* Set the effective user ID to the real user ID without changing the
 789          * saved set-user ID */
 790         status = seteuid (getuid ());
 791         if (status != 0)
 792         {
 793                 fprintf (stderr, "Temporarily dropping privileges "
 794                                 "failed: %s\n", strerror (errno));
 795                 exit (EXIT_FAILURE);
 796         }
 797 #endif
 798
 799         optind = read_options (argc, argv);
 800
 801 #if !_POSIX_SAVED_IDS
 802         /* Cannot temporarily drop privileges -> reject every file but "-". */
 803         if ((opt_filename != NULL)
 804                         && (strcmp ("-", opt_filename) != 0)
 805                         && (getuid () != geteuid ()))
 806         {
 807                 fprintf (stderr, "Your real and effective user IDs don't "
 808                                 "match. Reading from a file (option '-f')\n"
 809                                 "is therefore too risky. You can still read "
 810                                 "from STDIN using '-f -' if you like.\n"
 811                                 "Sorry.\n");
 812                 exit (EXIT_FAILURE);
 813         }
 814 #endif
 815
 816         if ((optind >= argc) && (opt_filename == NULL)) {
 817                 usage_exit (argv[0], 1);
 818         }
 819
 820         if ((ping = ping_construct ()) == NULL)
 821         {
 822                 fprintf (stderr, "ping_construct failed\n");
 823                 return (1);
 824         }
 825
 826         if (ping_setopt (ping, PING_OPT_TTL, &opt_send_ttl) != 0)
 827         {
 828                 fprintf (stderr, "Setting TTL to %i failed: %s\n",
 829                                 opt_send_ttl, ping_get_error (ping));
 830         }
 831
 832         {
 833                 double temp_sec;
 834                 double temp_nsec;
 835
 836                 temp_nsec = modf (opt_interval, &temp_sec);
 837                 ts_int.tv_sec  = (time_t) temp_sec;
 838                 ts_int.tv_nsec = (long) (temp_nsec * 1000000000L);
 839
 840                 /* printf ("ts_int = %i.%09li\n", (int) ts_int.tv_sec, ts_int.tv_nsec); */
 841         }
 842
 843         if (opt_addrfamily != PING_DEF_AF)
 844                 ping_setopt (ping, PING_OPT_AF, (void *) &opt_addrfamily);
 845
 846         if (opt_srcaddr != NULL)
 847         {
 848                 if (ping_setopt (ping, PING_OPT_SOURCE, (void *) opt_srcaddr) != 0)
 849                 {
 850                         fprintf (stderr, "Setting source address failed: %s\n",
 851                                         ping_get_error (ping));
 852                 }
 853         }
 854
 855         if (opt_device != NULL)
 856         {
 857                 if (ping_setopt (ping, PING_OPT_DEVICE, (void *) opt_device) != 0)
 858                 {
 859                         fprintf (stderr, "Setting device failed: %s\n",
 860                                         ping_get_error (ping));
 861                 }
 862         }
 863
 864         if (opt_filename != NULL)
 865         {
 866                 FILE *infile;
 867                 char line[256];
 868                 char host[256];
 869
 870                 if (strcmp (opt_filename, "-") == 0)
 871                         /* Open STDIN */
 872                         infile = fdopen(0, "r");
 873                 else
 874                         infile = fopen(opt_filename, "r");
 875
 876                 if (infile == NULL)
 877                 {
 878                         fprintf (stderr, "Opening %s failed: %s\n",
 879                                         (strcmp (opt_filename, "-") == 0)
 880                                         ? "STDIN" : opt_filename,
 881                                         strerror(errno));
 882                         return (1);
 883                 }
 884
 885 #if _POSIX_SAVED_IDS
 886                 /* Regain privileges */
 887                 status = seteuid (saved_set_uid);
 888                 if (status != 0)
 889                 {
 890                         fprintf (stderr, "Temporarily re-gaining privileges "
 891                                         "failed: %s\n", strerror (errno));
 892                         exit (EXIT_FAILURE);
 893                 }
 894 #endif
 895
 896                 while (fgets(line, sizeof(line), infile))
 897                 {
 898                         /* Strip whitespace */
 899                         if (sscanf(line, "%s", host) != 1)
 900                                 continue;
 901
 902                         if ((host[0] == 0) || (host[0] == '#'))
 903                                 continue;
 904
 905                         if (ping_host_add(ping, host) < 0)
 906                         {
 907                                 const char *errmsg = ping_get_error (ping);
 908
 909                                 fprintf (stderr, "Adding host `%s' failed: %s\n", host, errmsg);
 910                                 continue;
 911                         }
 912                         else
 913                         {
 914                                 host_num++;
 915                         }
 916                 }
 917
 918 #if _POSIX_SAVED_IDS
 919                 /* Drop privileges */
 920                 status = seteuid (getuid ());
 921                 if (status != 0)
 922                 {
 923                         fprintf (stderr, "Temporarily dropping privileges "
 924                                         "failed: %s\n", strerror (errno));
 925                         exit (EXIT_FAILURE);
 926                 }
 927 #endif
 928
 929                 fclose(infile);
 930         }
 931
 932 #if _POSIX_SAVED_IDS
 933         /* Regain privileges */
 934         status = seteuid (saved_set_uid);
 935         if (status != 0)
 936         {
 937                 fprintf (stderr, "Temporarily re-gaining privileges "
 938                                 "failed: %s\n", strerror (errno));
 939                 exit (EXIT_FAILURE);
 940         }
 941 #endif
 942
 943         for (i = optind; i < argc; i++)
 944         {
 945                 if (ping_host_add (ping, argv[i]) < 0)
 946                 {
 947                         const char *errmsg = ping_get_error (ping);
 948
 949                         fprintf (stderr, "Adding host `%s' failed: %s\n", argv[i], errmsg);
 950                         continue;
 951                 }
 952                 else
 953                 {
 954                         host_num++;
 955                 }
 956         }
 957
 958         /* Permanently drop root privileges if we're setuid-root. */
 959         status = setuid (getuid ());
 960         if (status != 0)
 961         {
 962                 fprintf (stderr, "Dropping privileges failed: %s\n",
 963                                 strerror (errno));
 964                 exit (EXIT_FAILURE);
 965         }
 966
 967 #if _POSIX_SAVED_IDS
 968         saved_set_uid = (uid_t) -1;
 969 #endif
 970
 971         ping_initialize_contexts (ping);
 972
 973         if (i == 0)
 974                 return (1);
 975
 976         memset (&sigint_action, '\0', sizeof (sigint_action));
 977         sigint_action.sa_handler = sigint_handler;
 978         if (sigaction (SIGINT, &sigint_action, NULL) < 0)
 979         {
 980                 perror ("sigaction");
 981                 return (1);
 982         }
 983
 984         pre_loop_hook (ping);
 985
 986         while (opt_count != 0)
 987         {
 988                 int index;
 989                 int status;
 990
 991                 if (gettimeofday (&tv_begin, NULL) < 0)
 992                 {
 993                         perror ("gettimeofday");
 994                         return (1);
 995                 }
 996
 997                 if (ping_send (ping) < 0)
 998                 {
 999                         fprintf (stderr, "ping_send failed: %s\n",
1000                                         ping_get_error (ping));
1001                         return (1);
1002                 }
1003
1004                 index = 0;
1005                 for (iter = ping_iterator_get (ping);
1006                                 iter != NULL;
1007                                 iter = ping_iterator_next (iter))
1008                 {
1009                         update_host_hook (iter, index);
1010                         index++;
1011                 }
1012
1013                 pre_sleep_hook (ping);
1014
1015                 /* Don't sleep in the last iteration */
1016                 if (opt_count == 1)
1017                         break;
1018
1019                 if (gettimeofday (&tv_end, NULL) < 0)
1020                 {
1021                         perror ("gettimeofday");
1022                         return (1);
1023                 }
1024
1025                 time_calc (&ts_wait, &ts_int, &tv_begin, &tv_end);
1026
1027                 /* printf ("Sleeping for %i.%09li seconds\n", (int) ts_wait.tv_sec, ts_wait.tv_nsec); */
1028                 while ((status = nanosleep (&ts_wait, &ts_wait)) != 0)
1029                 {
1030                         if (errno != EINTR)
1031                         {
1032                                 perror ("nanosleep");
1033                                 break;
1034                         }
1035                         else if (opt_count == 0)
1036                         {
1037                                 /* sigint */
1038                                 break;
1039                         }
1040                 }
1041
1042                 post_sleep_hook (ping);
1043
1044                 if (opt_count > 0)
1045                         opt_count--;
1046         } /* while (opt_count != 0) */
1047
1048         post_loop_hook (ping);
1049
1050         ping_destroy (ping);
1051
1052         return (0);
1053 } /* }}} int main */
1054
1055 /* vim: set fdm=marker : */