src/oping.c

   1 /**
   2  * Object oriented C module to send ICMP and ICMPv6 `echo's.
   3  * Copyright (C) 2006  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_MATH_H
  35 # include <math.h>
  36 #endif
  37
  38 #if TIME_WITH_SYS_TIME
  39 # include <sys/time.h>
  40 # include <time.h>
  41 #else
  42 # if HAVE_SYS_TIME_H
  43 #  include <sys/time.h>
  44 # else
  45 #  include <time.h>
  46 # endif
  47 #endif
  48
  49 #if HAVE_NETDB_H
  50 # include <netdb.h> /* NI_MAXHOST */
  51 #endif
  52
  53 #if HAVE_SIGNAL_H
  54 # include <signal.h>
  55 #endif
  56
  57 #include "oping.h"
  58
  59 typedef struct ping_context
  60 {
  61         char host[NI_MAXHOST];
  62         char addr[NI_MAXHOST];
  63
  64         int req_sent;
  65         int req_rcvd;
  66
  67         double latency_min;
  68         double latency_max;
  69         double latency_total;
  70         double latency_total_square;
  71 } ping_context_t;
  72
  73 static double  opt_interval   = 1.0;
  74 static int     opt_addrfamily = PING_DEF_AF;
  75 static char   *opt_srcaddr    = NULL;
  76 static int     opt_count      = -1;
  77
  78 static void sigint_handler (int signal)
  79 {
  80         /* Make compiler happy */
  81         signal = 0;
  82         /* Exit the loop */
  83         opt_count = 0;
  84 }
  85
  86 static ping_context_t *context_create (void)
  87 {
  88         ping_context_t *ret;
  89
  90         if ((ret = malloc (sizeof (ping_context_t))) == NULL)
  91                 return (NULL);
  92
  93         memset (ret, '\0', sizeof (ping_context_t));
  94
  95         ret->latency_min   = -1.0;
  96         ret->latency_max   = -1.0;
  97         ret->latency_total = 0.0;
  98         ret->latency_total_square = 0.0;
  99
 100         return (ret);
 101 }
 102
 103 static void context_destroy (ping_context_t *context)
 104 {
 105         free (context);
 106 }
 107
 108 static void usage_exit (const char *name)
 109 {
 110         fprintf (stderr, "Usage: %s [-46] [-c count] [-i interval] host [host [host ...]]\n",
 111                         name);
 112         exit (1);
 113 }
 114
 115 static int read_options (int argc, char **argv)
 116 {
 117         int optchar;
 118
 119         while (1)
 120         {
 121                 optchar = getopt (argc, argv, "46c:hi:I:");
 122
 123                 if (optchar == -1)
 124                         break;
 125
 126                 switch (optchar)
 127                 {
 128                         case '4':
 129                         case '6':
 130                                 opt_addrfamily = (optchar == '4') ? AF_INET : AF_INET6;
 131                                 break;
 132
 133                         case 'c':
 134                                 {
 135                                         int new_count;
 136                                         new_count = atoi (optarg);
 137                                         if (new_count > 0)
 138                                                 opt_count = new_count;
 139                                 }
 140                                 break;
 141
 142                         case 'i':
 143                                 {
 144                                         double new_interval;
 145                                         new_interval = atof (optarg);
 146                                         if (new_interval < 0.001)
 147                                                 fprintf (stderr, "Ignoring invalid interval %g.\n",
 148                                                                 new_interval);
 149                                         else
 150                                                 opt_interval = new_interval;
 151                                 }
 152                                 break;
 153                         case 'I':
 154                                 {
 155                                         if (opt_srcaddr != NULL)
 156                                                 free (opt_srcaddr);
 157                                         opt_srcaddr = strdup (optarg);
 158                                 }
 159                                 break;
 160
 161                         case 'h':
 162                         default:
 163                                 usage_exit (argv[0]);
 164                 }
 165         }
 166
 167         return (optind);
 168 }
 169
 170 static void print_host (pingobj_iter_t *iter)
 171 {
 172         double          latency;
 173         unsigned int    sequence;
 174         size_t          buffer_len;
 175         size_t          data_len;
 176         ping_context_t *context;
 177
 178         buffer_len = sizeof (latency);
 179         ping_iterator_get_info (iter, PING_INFO_LATENCY,
 180                         &latency, &buffer_len);
 181
 182         buffer_len = sizeof (sequence);
 183         ping_iterator_get_info (iter, PING_INFO_SEQUENCE,
 184                         &sequence, &buffer_len);
 185
 186         data_len = 0;
 187         ping_iterator_get_info (iter, PING_INFO_DATA,
 188                         NULL, &data_len);
 189
 190         context = (ping_context_t *) ping_iterator_get_context (iter);
 191
 192         context->req_sent++;
 193         if (latency > 0.0)
 194         {
 195                 context->req_rcvd++;
 196                 context->latency_total += latency;
 197                 context->latency_total_square += (latency * latency);
 198
 199                 if ((context->latency_max < 0.0) || (context->latency_max < latency))
 200                         context->latency_max = latency;
 201                 if ((context->latency_min < 0.0) || (context->latency_min > latency))
 202                         context->latency_min = latency;
 203
 204                 printf ("%zu bytes from %s (%s): icmp_seq=%u time=%.2f ms\n",
 205                                 data_len,
 206                                 context->host, context->addr,
 207                                 sequence, latency);
 208         }
 209         else
 210         {
 211                 printf ("echo reply from %s (%s): icmp_seq=%u timeout\n",
 212                                 context->host, context->addr,
 213                                 sequence);
 214         }
 215 }
 216
 217 static void time_normalize (struct timespec *ts)
 218 {
 219         while (ts->tv_nsec < 0)
 220         {
 221                 if (ts->tv_sec == 0)
 222                 {
 223                         ts->tv_nsec = 0;
 224                         return;
 225                 }
 226
 227                 ts->tv_sec  -= 1;
 228                 ts->tv_nsec += 1000000000;
 229         }
 230
 231         while (ts->tv_nsec >= 1000000000)
 232         {
 233                 ts->tv_sec  += 1;
 234                 ts->tv_nsec -= 1000000000;
 235         }
 236 }
 237
 238 static void time_calc (struct timespec *ts_dest,
 239                 const struct timespec *ts_int,
 240                 const struct timeval  *tv_begin,
 241                 const struct timeval  *tv_end)
 242 {
 243         ts_dest->tv_sec = tv_begin->tv_sec + ts_int->tv_sec;
 244         ts_dest->tv_nsec = (tv_begin->tv_usec * 1000) + ts_int->tv_nsec;
 245         time_normalize (ts_dest);
 246
 247         /* Assure that `(begin + interval) > end'.
 248          * This may seem overly complicated, but `tv_sec' is of type `time_t'
 249          * which may be `unsigned. *sigh* */
 250         if ((tv_end->tv_sec > ts_dest->tv_sec)
 251                         || ((tv_end->tv_sec == ts_dest->tv_sec)
 252                                 && ((tv_end->tv_usec * 1000) > ts_dest->tv_nsec)))
 253         {
 254                 ts_dest->tv_sec  = 0;
 255                 ts_dest->tv_nsec = 0;
 256                 return;
 257         }
 258
 259         ts_dest->tv_sec = ts_dest->tv_sec - tv_end->tv_sec;
 260         ts_dest->tv_nsec = ts_dest->tv_nsec - (tv_end->tv_usec * 1000);
 261         time_normalize (ts_dest);
 262 }
 263
 264 int main (int argc, char **argv)
 265 {
 266         pingobj_t      *ping;
 267         pingobj_iter_t *iter;
 268
 269         struct sigaction sigint_action;
 270
 271         struct timeval  tv_begin;
 272         struct timeval  tv_end;
 273         struct timespec ts_wait;
 274         struct timespec ts_int;
 275
 276         int optind;
 277         int i;
 278
 279         optind = read_options (argc, argv);
 280
 281         if (optind >= argc)
 282                 usage_exit (argv[0]);
 283
 284         if (geteuid () != 0)
 285         {
 286                 fprintf (stderr, "Need superuser privileges to open a RAW socket. Sorry.\n");
 287                 return (1);
 288         }
 289
 290         if ((ping = ping_construct ()) == NULL)
 291         {
 292                 fprintf (stderr, "ping_construct failed\n");
 293                 return (1);
 294         }
 295
 296         {
 297                 double temp_sec;
 298                 double temp_nsec;
 299
 300                 temp_nsec = modf (opt_interval, &temp_sec);
 301                 ts_int.tv_sec  = (time_t) temp_sec;
 302                 ts_int.tv_nsec = (long) (temp_nsec * 1000000000L);
 303
 304                 /* printf ("ts_int = %i.%09li\n", (int) ts_int.tv_sec, ts_int.tv_nsec); */
 305         }
 306
 307         if (opt_addrfamily != PING_DEF_AF)
 308                 ping_setopt (ping, PING_OPT_AF, (void *) &opt_addrfamily);
 309
 310         if (opt_srcaddr != NULL)
 311         {
 312                 if (ping_setopt (ping, PING_OPT_SOURCE, (void *) opt_srcaddr) != 0)
 313                 {
 314                         fprintf (stderr, "Setting source address failed: %s\n",
 315                                         ping_get_error (ping));
 316                 }
 317         }
 318
 319         for (i = optind; i < argc; i++)
 320         {
 321                 if (ping_host_add (ping, argv[i]) < 0)
 322                 {
 323                         const char *errmsg = ping_get_error (ping);
 324
 325                         fprintf (stderr, "Adding host `%s' failed: %s\n", argv[i], errmsg);
 326                         continue;
 327                 }
 328         }
 329
 330         /* Drop root privileges if we're setuid-root. */
 331         setuid (getuid ());
 332
 333         i = 0;
 334         for (iter = ping_iterator_get (ping);
 335                         iter != NULL;
 336                         iter = ping_iterator_next (iter))
 337         {
 338                 ping_context_t *context;
 339                 size_t buffer_size;
 340
 341                 context = context_create ();
 342
 343                 buffer_size = sizeof (context->host);
 344                 ping_iterator_get_info (iter, PING_INFO_HOSTNAME, context->host, &buffer_size);
 345
 346                 buffer_size = sizeof (context->addr);
 347                 ping_iterator_get_info (iter, PING_INFO_ADDRESS, context->addr, &buffer_size);
 348
 349                 buffer_size = 0;
 350                 ping_iterator_get_info (iter, PING_INFO_DATA, NULL, &buffer_size);
 351
 352                 printf ("PING %s (%s) %zu bytes of data.\n",
 353                                 context->host, context->addr, buffer_size);
 354
 355                 ping_iterator_set_context (iter, (void *) context);
 356
 357                 i++;
 358         }
 359
 360         if (i == 0)
 361                 return (1);
 362
 363         memset (&sigint_action, '\0', sizeof (sigint_action));
 364         sigint_action.sa_handler = sigint_handler;
 365         if (sigaction (SIGINT, &sigint_action, NULL) < 0)
 366         {
 367                 perror ("sigaction");
 368                 return (1);
 369         }
 370
 371         while (opt_count != 0)
 372         {
 373                 int status;
 374
 375                 if (gettimeofday (&tv_begin, NULL) < 0)
 376                 {
 377                         perror ("gettimeofday");
 378                         return (1);
 379                 }
 380
 381                 if (ping_send (ping) < 0)
 382                 {
 383                         fprintf (stderr, "ping_send failed: %s\n",
 384                                         ping_get_error (ping));
 385                         return (1);
 386                 }
 387
 388                 for (iter = ping_iterator_get (ping);
 389                                 iter != NULL;
 390                                 iter = ping_iterator_next (iter))
 391                 {
 392                         print_host (iter);
 393                 }
 394                 fflush (stdout);
 395
 396                 /* Don't sleep in the last iteration */
 397                 if (opt_count == 1)
 398                         break;
 399
 400                 if (gettimeofday (&tv_end, NULL) < 0)
 401                 {
 402                         perror ("gettimeofday");
 403                         return (1);
 404                 }
 405
 406                 time_calc (&ts_wait, &ts_int, &tv_begin, &tv_end);
 407
 408                 /* printf ("Sleeping for %i.%09li seconds\n", (int) ts_wait.tv_sec, ts_wait.tv_nsec); */
 409                 while ((status = nanosleep (&ts_wait, &ts_wait)) != 0)
 410                 {
 411                         if (errno != EINTR)
 412                         {
 413                                 perror ("nanosleep");
 414                                 break;
 415                         }
 416                         else if (opt_count == 0)
 417                         {
 418                                 /* sigint */
 419                                 break;
 420                         }
 421                 }
 422
 423                 if (opt_count > 0)
 424                         opt_count--;
 425         } /* while (opt_count != 0) */
 426
 427         for (iter = ping_iterator_get (ping);
 428                         iter != NULL;
 429                         iter = ping_iterator_next (iter))
 430         {
 431                 ping_context_t *context;
 432
 433                 context = ping_iterator_get_context (iter);
 434
 435                 printf ("\n--- %s ping statistics ---\n"
 436                                 "%i packets transmitted, %i received, %.2f%% packet loss, time %.1fms\n",
 437                                 context->host, context->req_sent, context->req_rcvd,
 438                                 100.0 * (context->req_sent - context->req_rcvd) / ((double) context->req_sent),
 439                                 context->latency_total);
 440
 441                 if (context->req_rcvd != 0)
 442                 {
 443                         double num_total;
 444                         double average;
 445                         double deviation;
 446
 447                         num_total = (double) context->req_rcvd;
 448
 449                         average = context->latency_total / num_total;
 450                         deviation = sqrt (((num_total * context->latency_total_square) - (context->latency_total * context->latency_total))
 451                                         / (num_total * (num_total - 1.0)));
 452
 453                         printf ("rtt min/avg/max/sdev = %.3f/%.3f/%.3f/%.3f ms\n",
 454                                         context->latency_min,
 455                                         average,
 456                                         context->latency_max,
 457                                         deviation);
 458                 }
 459
 460                 ping_iterator_set_context (iter, NULL);
 461                 context_destroy (context);
 462         }
 463
 464         ping_destroy (ping);
 465
 466         return (0);
 467 }