src/liboping.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_UNISTD_H
  35 # include <unistd.h>
  36 #endif
  37
  38 #if HAVE_FCNTL_H
  39 # include <fcntl.h>
  40 #endif
  41 #if HAVE_SYS_TYPES_H
  42 # include <sys/types.h>
  43 #endif
  44 #if HAVE_SYS_STAT_H
  45 # include <sys/stat.h>
  46 #endif
  47
  48 #if TIME_WITH_SYS_TIME
  49 # include <sys/time.h>
  50 # include <time.h>
  51 #else
  52 # if HAVE_SYS_TIME_H
  53 #  include <sys/time.h>
  54 # else
  55 #  include <time.h>
  56 # endif
  57 #endif
  58
  59 #if HAVE_SYS_SOCKET_H
  60 # include <sys/socket.h>
  61 #endif
  62 #if HAVE_NETDB_H
  63 # include <netdb.h>
  64 #endif
  65
  66 #if HAVE_NETINET_IN_SYSTM_H
  67 # include <netinet/in_systm.h>
  68 #endif
  69 #if HAVE_NETINET_IN_H
  70 # include <netinet/in.h>
  71 #endif
  72 #if HAVE_NETINET_IP_H
  73 # include <netinet/ip.h>
  74 #endif
  75 #if HAVE_NETINET_IP_ICMP_H
  76 # include <netinet/ip_icmp.h>
  77 #endif
  78 #ifdef HAVE_NETINET_IP_VAR_H
  79 # include <netinet/ip_var.h>
  80 #endif
  81 #if HAVE_NETINET_IP6_H
  82 # include <netinet/ip6.h>
  83 #endif
  84 #if HAVE_NETINET_ICMP6_H
  85 # include <netinet/icmp6.h>
  86 #endif
  87
  88 #include "oping.h"
  89
  90 #if WITH_DEBUG
  91 # define dprintf(...) printf ("%s[%4i]: %-20s: ", __FILE__, __LINE__, __FUNCTION__); printf (__VA_ARGS__)
  92 #else
  93 # define dprintf(...) /**/
  94 #endif
  95
  96 #define PING_ERRMSG_LEN 256
  97
  98 struct pinghost
  99 {
 100         char                    *hostname;
 101         struct sockaddr_storage *addr;
 102         socklen_t                addrlen;
 103         int                      addrfamily;
 104         int                      fd;
 105         int                      ident;
 106         int                      sequence;
 107         struct timeval          *timer;
 108         double                   latency;
 109         char                    *data;
 110
 111         void                    *context;
 112
 113         struct pinghost         *next;
 114 };
 115
 116 struct pingobj
 117 {
 118         double                   timeout;
 119         int                      ttl;
 120         int                      addrfamily;
 121         char                    *data;
 122
 123         struct sockaddr_storage *srcaddr;
 124         socklen_t                srcaddrlen;
 125
 126         char                     errmsg[PING_ERRMSG_LEN];
 127
 128         pinghost_t              *head;
 129 };
 130
 131 /*
 132  * private (static) functions
 133  */
 134 static void ping_set_error (pingobj_t *obj, const char *function,
 135                 const char *message)
 136 {
 137         snprintf (obj->errmsg, PING_ERRMSG_LEN, "%s: %s", function, message);
 138         obj->errmsg[PING_ERRMSG_LEN - 1] = '\0';
 139 }
 140
 141 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
 142                 struct timeval *res)
 143 {
 144         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
 145         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
 146
 147         while (res->tv_usec > 1000000)
 148         {
 149                 res->tv_usec -= 1000000;
 150                 res->tv_sec++;
 151         }
 152
 153         return (0);
 154 }
 155
 156 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
 157                 struct timeval *res)
 158 {
 159
 160         if ((tv1->tv_sec < tv2->tv_sec)
 161                         || ((tv1->tv_sec == tv2->tv_sec)
 162                                 && (tv1->tv_usec < tv2->tv_usec)))
 163                 return (-1);
 164
 165         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
 166         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
 167
 168         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec > 0)));
 169
 170         while (res->tv_usec < 0)
 171         {
 172                 res->tv_usec += 1000000;
 173                 res->tv_sec--;
 174         }
 175
 176         return (0);
 177 }
 178
 179 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
 180 {
 181         uint32_t sum = 0;
 182         uint16_t ret = 0;
 183
 184         uint16_t *ptr;
 185
 186         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
 187                 sum += *ptr;
 188
 189         if (len == 1)
 190         {
 191                 *(char *) &ret = *(char *) ptr;
 192                 sum += ret;
 193         }
 194
 195         /* Do this twice to get all possible carries.. */
 196         sum = (sum >> 16) + (sum & 0xFFFF);
 197         sum = (sum >> 16) + (sum & 0xFFFF);
 198
 199         ret = ~sum;
 200
 201         return (ret);
 202 }
 203
 204 static pinghost_t *ping_receive_ipv4 (pinghost_t *ph, char *buffer, size_t buffer_len)
 205 {
 206         struct ip *ip_hdr;
 207         struct icmp *icmp_hdr;
 208
 209         size_t ip_hdr_len;
 210
 211         uint16_t recv_checksum;
 212         uint16_t calc_checksum;
 213
 214         uint16_t ident;
 215         uint16_t seq;
 216
 217         pinghost_t *ptr;
 218
 219         if (buffer_len < sizeof (struct ip))
 220                 return (NULL);
 221
 222         ip_hdr     = (struct ip *) buffer;
 223         ip_hdr_len = ip_hdr->ip_hl << 2;
 224
 225         if (buffer_len < ip_hdr_len)
 226                 return (NULL);
 227
 228         buffer     += ip_hdr_len;
 229         buffer_len -= ip_hdr_len;
 230
 231         if (buffer_len < sizeof (struct icmp))
 232                 return (NULL);
 233
 234         icmp_hdr = (struct icmp *) buffer;
 235         buffer     += sizeof (struct icmp);
 236         buffer_len -= sizeof (struct icmp);
 237
 238         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
 239         {
 240                 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
 241                 return (NULL);
 242         }
 243
 244         recv_checksum = icmp_hdr->icmp_cksum;
 245         icmp_hdr->icmp_cksum = 0;
 246         calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
 247                         sizeof (struct icmp) + buffer_len);
 248
 249         if (recv_checksum != calc_checksum)
 250         {
 251                 dprintf ("Checksum missmatch: Got 0x%04x, calculated 0x%04x\n",
 252                                 recv_checksum, calc_checksum);
 253                 return (NULL);
 254         }
 255
 256         ident = ntohs (icmp_hdr->icmp_id);
 257         seq   = ntohs (icmp_hdr->icmp_seq);
 258
 259         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 260         {
 261                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 262                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 263
 264                 if (ptr->addrfamily != AF_INET)
 265                         continue;
 266
 267                 if (!timerisset (ptr->timer))
 268                         continue;
 269
 270                 if (ptr->ident != ident)
 271                         continue;
 272
 273                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 274                         continue;
 275
 276                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
 277                                 ptr->hostname, ident, seq);
 278
 279                 break;
 280         }
 281
 282         if (ptr == NULL)
 283         {
 284                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
 285                                 ident, seq);
 286         }
 287
 288         return (ptr);
 289 }
 290
 291 static pinghost_t *ping_receive_ipv6 (pinghost_t *ph, char *buffer, size_t buffer_len)
 292 {
 293         struct icmp6_hdr *icmp_hdr;
 294
 295         uint16_t ident;
 296         uint16_t seq;
 297
 298         pinghost_t *ptr;
 299
 300         if (buffer_len < sizeof (struct icmp6_hdr))
 301                 return (NULL);
 302
 303         icmp_hdr = (struct icmp6_hdr *) buffer;
 304         buffer     += sizeof (struct icmp);
 305         buffer_len -= sizeof (struct icmp);
 306
 307         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 308         {
 309                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 310                 return (NULL);
 311         }
 312
 313         if (icmp_hdr->icmp6_code != 0)
 314         {
 315                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 316                 return (NULL);
 317         }
 318
 319         ident = ntohs (icmp_hdr->icmp6_id);
 320         seq   = ntohs (icmp_hdr->icmp6_seq);
 321
 322         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 323         {
 324                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 325                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 326
 327                 if (ptr->addrfamily != AF_INET6)
 328                         continue;
 329
 330                 if (!timerisset (ptr->timer))
 331                         continue;
 332
 333                 if (ptr->ident != ident)
 334                         continue;
 335
 336                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 337                         continue;
 338
 339                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
 340                                 ptr->hostname, ident, seq);
 341
 342                 break;
 343         }
 344
 345         if (ptr == NULL)
 346         {
 347                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
 348                                 ident, seq);
 349         }
 350
 351         return (ptr);
 352 }
 353
 354 static int ping_receive_one (int fd, pinghost_t *ph, struct timeval *now)
 355 {
 356         char   buffer[4096];
 357         size_t buffer_len;
 358
 359         struct timeval diff;
 360
 361         pinghost_t *host = NULL;
 362
 363         struct sockaddr_storage sa;
 364         socklen_t               sa_len;
 365
 366         sa_len = sizeof (sa);
 367
 368         buffer_len = recvfrom (fd, buffer, sizeof (buffer), 0,
 369                         (struct sockaddr *) &sa, &sa_len);
 370         if (buffer_len == -1)
 371         {
 372                 dprintf ("recvfrom: %s\n", strerror (errno));
 373                 return (-1);
 374         }
 375
 376         dprintf ("Read %u bytes from fd = %i\n", (unsigned int) buffer_len, fd);
 377
 378         if (sa.ss_family == AF_INET)
 379         {
 380                 if ((host = ping_receive_ipv4 (ph, buffer, buffer_len)) == NULL)
 381                         return (-1);
 382         }
 383         else if (sa.ss_family == AF_INET6)
 384         {
 385                 if ((host = ping_receive_ipv6 (ph, buffer, buffer_len)) == NULL)
 386                         return (-1);
 387         }
 388
 389         dprintf ("rcvd: %12i.%06i\n",
 390                         (int) now->tv_sec,
 391                         (int) now->tv_usec);
 392         dprintf ("sent: %12i.%06i\n",
 393                         (int) host->timer->tv_sec,
 394                         (int) host->timer->tv_usec);
 395
 396         if (ping_timeval_sub (now, host->timer, &diff) < 0)
 397         {
 398                 timerclear (host->timer);
 399                 return (-1);
 400         }
 401
 402         dprintf ("diff: %12i.%06i\n",
 403                         (int) diff.tv_sec,
 404                         (int) diff.tv_usec);
 405
 406         host->latency  = ((double) diff.tv_usec) / 1000.0;
 407         host->latency += ((double) diff.tv_sec)  * 1000.0;
 408
 409         timerclear (host->timer);
 410
 411         return (0);
 412 }
 413
 414 static int ping_receive_all (pingobj_t *obj)
 415 {
 416         fd_set readfds;
 417         int num_readfds;
 418         int max_readfds;
 419
 420         pinghost_t *ph;
 421         pinghost_t *ptr;
 422
 423         struct timeval endtime;
 424         struct timeval nowtime;
 425         struct timeval timeout;
 426         int status;
 427
 428         int ret;
 429
 430         ph = obj->head;
 431         ret = 0;
 432
 433         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 434                 ptr->latency = -1.0;
 435
 436         if (gettimeofday (&nowtime, NULL) == -1)
 437         {
 438                 ping_set_error (obj, "gettimeofday", strerror (errno));
 439                 return (-1);
 440         }
 441
 442         /* Set up timeout */
 443         timeout.tv_sec = (time_t) obj->timeout;
 444         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 445
 446         dprintf ("Set timeout to %i.%06i seconds\n",
 447                         (int) timeout.tv_sec,
 448                         (int) timeout.tv_usec);
 449
 450         ping_timeval_add (&nowtime, &timeout, &endtime);
 451
 452         while (1)
 453         {
 454                 FD_ZERO (&readfds);
 455                 num_readfds =  0;
 456                 max_readfds = -1;
 457
 458                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 459                 {
 460                         if (!timerisset (ptr->timer))
 461                                 continue;
 462
 463                         FD_SET (ptr->fd, &readfds);
 464                         num_readfds++;
 465
 466                         if (max_readfds < ptr->fd)
 467                                 max_readfds = ptr->fd;
 468                 }
 469
 470                 if (num_readfds == 0)
 471                         break;
 472
 473                 if (gettimeofday (&nowtime, NULL) == -1)
 474                 {
 475                         ping_set_error (obj, "gettimeofday", strerror (errno));
 476                         return (-1);
 477                 }
 478
 479                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 480                         break;
 481
 482                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_readfds,
 483                                 (int) timeout.tv_sec,
 484                                 (int) timeout.tv_usec);
 485
 486                 status = select (max_readfds + 1, &readfds, NULL, NULL, &timeout);
 487
 488                 if (gettimeofday (&nowtime, NULL) == -1)
 489                 {
 490                         ping_set_error (obj, "gettimeofday", strerror (errno));
 491                         return (-1);
 492                 }
 493
 494                 if ((status == -1) && (errno == EINTR))
 495                 {
 496                         dprintf ("select was interrupted by signal..\n");
 497                         continue;
 498                 }
 499                 else if (status < 0)
 500                 {
 501                         dprintf ("select: %s\n", strerror (errno));
 502                         break;
 503                 }
 504                 else if (status == 0)
 505                 {
 506                         dprintf ("select timed out\n");
 507                         break;
 508                 }
 509
 510                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 511                 {
 512                         if (FD_ISSET (ptr->fd, &readfds))
 513                                 if (ping_receive_one (ptr->fd, ph, &nowtime) == 0)
 514                                         ret++;
 515                 }
 516         } /* while (1) */
 517
 518         return (ret);
 519 }
 520
 521 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 522  * Sending functions:                                                        *
 523  *                                                                           *
 524  * ping_send_all                                                             *
 525  * +-> ping_send_one_ipv4                                                    *
 526  * `-> ping_send_one_ipv6                                                    *
 527  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 528 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 529                 const void *buf, size_t buflen)
 530 {
 531         ssize_t ret;
 532
 533         if (gettimeofday (ph->timer, NULL) == -1)
 534         {
 535                 timerclear (ph->timer);
 536                 return (-1);
 537         }
 538
 539         ret = sendto (ph->fd, buf, buflen, 0,
 540                         (struct sockaddr *) ph->addr, ph->addrlen);
 541
 542         if (ret < 0)
 543         {
 544 #if defined(EHOSTUNREACH)
 545                 if (errno == EHOSTUNREACH)
 546                         return (0);
 547 #endif
 548 #if defined(ENETUNREACH)
 549                 if (errno == ENETUNREACH)
 550                         return (0);
 551 #endif
 552                 ping_set_error (obj, "sendto", strerror (errno));
 553         }
 554
 555         return (ret);
 556 }
 557
 558 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 559 {
 560         struct icmp *icmp4;
 561         int status;
 562
 563         char buf[4096];
 564         int  buflen;
 565
 566         char *data;
 567         int   datalen;
 568
 569         dprintf ("ph->hostname = %s\n", ph->hostname);
 570
 571         memset (buf, '\0', sizeof (buf));
 572         icmp4 = (struct icmp *) buf;
 573         data  = (char *) (icmp4 + 1);
 574
 575         icmp4->icmp_type  = ICMP_ECHO;
 576         icmp4->icmp_code  = 0;
 577         icmp4->icmp_cksum = 0;
 578         icmp4->icmp_id    = htons (ph->ident);
 579         icmp4->icmp_seq   = htons (ph->sequence);
 580
 581         buflen = 4096 - sizeof (struct icmp);
 582         strncpy (data, ph->data, buflen);
 583         datalen = strlen (data);
 584
 585         buflen = datalen + sizeof (struct icmp);
 586
 587         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 588
 589         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 590
 591         status = ping_sendto (obj, ph, buf, buflen);
 592         if (status < 0)
 593         {
 594                 perror ("ping_sendto");
 595                 return (-1);
 596         }
 597
 598         dprintf ("sendto: status = %i\n", status);
 599
 600         return (0);
 601 }
 602
 603 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 604 {
 605         struct icmp6_hdr *icmp6;
 606         int status;
 607
 608         char buf[4096];
 609         int  buflen;
 610
 611         char *data;
 612         int   datalen;
 613
 614         dprintf ("ph->hostname = %s\n", ph->hostname);
 615
 616         memset (buf, '\0', sizeof (buf));
 617         icmp6 = (struct icmp6_hdr *) buf;
 618         data  = (char *) (icmp6 + 1);
 619
 620         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 621         icmp6->icmp6_code  = 0;
 622         /* The checksum will be calculated by the TCP/IP stack.  */
 623         /* FIXME */
 624         icmp6->icmp6_cksum = 0;
 625         icmp6->icmp6_id    = htons (ph->ident);
 626         icmp6->icmp6_seq   = htons (ph->sequence);
 627
 628         buflen = 4096 - sizeof (struct icmp6_hdr);
 629         strncpy (data, ph->data, buflen);
 630         datalen = strlen (data);
 631
 632         buflen = datalen + sizeof (struct icmp6_hdr);
 633
 634         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 635
 636         status = ping_sendto (obj, ph, buf, buflen);
 637         if (status < 0)
 638         {
 639                 perror ("ping_sendto");
 640                 return (-1);
 641         }
 642
 643         dprintf ("sendto: status = %i\n", status);
 644
 645         return (0);
 646 }
 647
 648 static int ping_send_all (pingobj_t *obj)
 649 {
 650         pinghost_t *ph;
 651         pinghost_t *ptr;
 652
 653         int ret;
 654
 655         ret = 0;
 656         ph = obj->head;
 657
 658         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 659         {
 660                 /* start timer.. The GNU `ping6' starts the timer before
 661                  * sending the packet, so I will do that too */
 662                 if (gettimeofday (ptr->timer, NULL) == -1)
 663                 {
 664                         dprintf ("gettimeofday: %s\n", strerror (errno));
 665                         timerclear (ptr->timer);
 666                         ret--;
 667                         continue;
 668                 }
 669                 else
 670                 {
 671                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 672                 }
 673
 674                 if (ptr->addrfamily == AF_INET6)
 675                 {
 676                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 677                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 678                         {
 679                                 timerclear (ptr->timer);
 680                                 ret--;
 681                                 continue;
 682                         }
 683                 }
 684                 else if (ptr->addrfamily == AF_INET)
 685                 {
 686                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 687                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 688                         {
 689                                 timerclear (ptr->timer);
 690                                 ret--;
 691                                 continue;
 692                         }
 693                 }
 694                 else /* this should not happen */
 695                 {
 696                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 697                         timerclear (ptr->timer);
 698                         ret--;
 699                         continue;
 700                 }
 701
 702                 ptr->sequence++;
 703         }
 704
 705         return (ret);
 706 }
 707
 708 /*
 709  * Set the TTL of a socket protocol independently.
 710  */
 711 static int ping_set_ttl (pinghost_t *ph, int ttl)
 712 {
 713         int ret = -2;
 714
 715         if (ph->addrfamily == AF_INET)
 716         {
 717                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL, &ttl, sizeof (ttl));
 718         }
 719         else if (ph->addrfamily == AF_INET6)
 720         {
 721                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof (ttl));
 722         }
 723
 724         return (ret);
 725 }
 726
 727 static int ping_get_ident (void)
 728 {
 729         int fd;
 730         static int did_seed = 0;
 731
 732         int retval;
 733
 734         if (did_seed == 0)
 735         {
 736                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 737                 {
 738                         unsigned int seed;
 739
 740                         if (read (fd, &seed, sizeof (seed)) != -1)
 741                         {
 742                                 did_seed = 1;
 743                                 dprintf ("Random seed: %i\n", seed);
 744                                 srandom (seed);
 745                         }
 746
 747                         close (fd);
 748                 }
 749                 else
 750                 {
 751                         dprintf ("open (/dev/urandom): %s\n", strerror (errno));
 752                 }
 753         }
 754
 755         retval = (int) random ();
 756
 757         dprintf ("Random number: %i\n", retval);
 758
 759         return (retval);
 760 }
 761
 762 static pinghost_t *ping_alloc (void)
 763 {
 764         pinghost_t *ph;
 765         size_t      ph_size;
 766
 767         ph_size = sizeof (pinghost_t)
 768                 + sizeof (struct sockaddr_storage)
 769                 + sizeof (struct timeval);
 770
 771         ph = (pinghost_t *) malloc (ph_size);
 772         if (ph == NULL)
 773                 return (NULL);
 774
 775         memset (ph, '\0', ph_size);
 776
 777         ph->timer   = (struct timeval *) (ph + 1);
 778         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
 779
 780         ph->addrlen = sizeof (struct sockaddr_storage);
 781         ph->latency = -1.0;
 782         ph->ident   = ping_get_ident () & 0xFFFF;
 783
 784         return (ph);
 785 }
 786
 787 static void ping_free (pinghost_t *ph)
 788 {
 789         if (ph->hostname != NULL)
 790                 free (ph->hostname);
 791
 792         if (ph->data != NULL)
 793                 free (ph->data);
 794
 795         free (ph);
 796 }
 797
 798 /*
 799  * public methods
 800  */
 801 const char *ping_get_error (pingobj_t *obj)
 802 {
 803         return (obj->errmsg);
 804 }
 805
 806 pingobj_t *ping_construct (void)
 807 {
 808         pingobj_t *obj;
 809
 810         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
 811                 return (NULL);
 812         memset (obj, '\0', sizeof (pingobj_t));
 813
 814         obj->timeout    = PING_DEF_TIMEOUT;
 815         obj->ttl        = PING_DEF_TTL;
 816         obj->addrfamily = PING_DEF_AF;
 817         obj->data       = strdup (PING_DEF_DATA);
 818
 819         return (obj);
 820 }
 821
 822 void ping_destroy (pingobj_t *obj)
 823 {
 824         pinghost_t *current;
 825         pinghost_t *next;
 826
 827         current = obj->head;
 828         next = NULL;
 829
 830         while (current != NULL)
 831         {
 832                 next = current->next;
 833                 ping_free (current);
 834                 current = next;
 835         }
 836
 837         if (obj->data != NULL)
 838                 free (obj->data);
 839
 840         if (obj->srcaddr != NULL)
 841                 free (obj->srcaddr);
 842
 843         free (obj);
 844
 845         return;
 846 }
 847
 848 int ping_setopt (pingobj_t *obj, int option, void *value)
 849 {
 850         int ret = 0;
 851
 852         switch (option)
 853         {
 854                 case PING_OPT_TIMEOUT:
 855                         obj->timeout = *((double *) value);
 856                         if (obj->timeout < 0.0)
 857                         {
 858                                 obj->timeout = PING_DEF_TIMEOUT;
 859                                 ret = -1;
 860                         }
 861                         break;
 862
 863                 case PING_OPT_TTL:
 864                         obj->ttl = *((int *) value);
 865                         if ((obj->ttl < 1) || (obj->ttl > 255))
 866                         {
 867                                 obj->ttl = PING_DEF_TTL;
 868                                 ret = -1;
 869                         }
 870                         break;
 871
 872                 case PING_OPT_AF:
 873                         obj->addrfamily = *((int *) value);
 874                         if ((obj->addrfamily != AF_UNSPEC)
 875                                         && (obj->addrfamily != AF_INET)
 876                                         && (obj->addrfamily != AF_INET6))
 877                         {
 878                                 obj->addrfamily = PING_DEF_AF;
 879                                 ret = -1;
 880                         }
 881                         if (obj->srcaddr != NULL)
 882                         {
 883                                 free (obj->srcaddr);
 884                                 obj->srcaddr = NULL;
 885                         }
 886                         break;
 887
 888                 case PING_OPT_DATA:
 889                         if (obj->data != NULL)
 890                         {
 891                                 free (obj->data);
 892                                 obj->data = NULL;
 893                         }
 894                         obj->data = strdup ((const char *) value);
 895                         break;
 896
 897                 case PING_OPT_SOURCE:
 898                 {
 899                         char            *hostname = (char *) value;
 900                         struct addrinfo  ai_hints;
 901                         struct addrinfo *ai_list;
 902                         int              status;
 903 #if WITH_DEBUG
 904                         if (obj->addrfamily != AF_UNSPEC)
 905                         {
 906                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
 907                         }
 908 #endif
 909                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
 910                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
 911 #if defined(AI_ADDRCONFIG)
 912                         ai_hints.ai_flags = AI_ADDRCONFIG;
 913 #endif
 914                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
 915                         if (status != 0)
 916                         {
 917                                 ping_set_error (obj, "getaddrinfo",
 918                                                 status == EAI_SYSTEM
 919                                                 ? strerror (errno)
 920                                                 : gai_strerror (status));
 921                                 ret = -1;
 922                                 break;
 923                         }
 924 #if WITH_DEBUG
 925                         if (ai_list->ai_next != NULL)
 926                         {
 927                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
 928                         }
 929 #endif
 930                         if (obj->srcaddr == NULL)
 931                         {
 932                                 obj->srcaddrlen = 0;
 933                                 obj->srcaddr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage));
 934                                 if (obj->srcaddr == NULL)
 935                                 {
 936                                         ping_set_error (obj, "malloc",
 937                                                         strerror (errno));
 938                                         ret = -1;
 939                                         freeaddrinfo (ai_list);
 940                                         break;
 941                                 }
 942                         }
 943                         memset ((void *) obj->srcaddr, '\0', sizeof (struct sockaddr_storage));
 944                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
 945                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
 946                                         ai_list->ai_addrlen);
 947                         obj->srcaddrlen = ai_list->ai_addrlen;
 948                         obj->addrfamily = ai_list->ai_family;
 949
 950                         freeaddrinfo (ai_list);
 951                 } /* case PING_OPT_SOURCE */
 952                 break;
 953
 954                 default:
 955                         ret = -2;
 956         } /* switch (option) */
 957
 958         return (ret);
 959 } /* int ping_setopt */
 960
 961
 962 int ping_send (pingobj_t *obj)
 963 {
 964         int ret;
 965
 966         if (ping_send_all (obj) < 0)
 967                 return (-1);
 968
 969         if ((ret = ping_receive_all (obj)) < 0)
 970                 return (-2);
 971
 972         return (ret);
 973 }
 974
 975 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
 976 {
 977         while (ph != NULL)
 978         {
 979                 if (strcasecmp (ph->hostname, host) == 0)
 980                         break;
 981
 982                 ph = ph->next;
 983         }
 984
 985         return (ph);
 986 }
 987
 988 int ping_host_add (pingobj_t *obj, const char *host)
 989 {
 990         pinghost_t *ph;
 991
 992         struct sockaddr_storage sockaddr;
 993         socklen_t               sockaddr_len;
 994
 995         struct addrinfo  ai_hints;
 996         struct addrinfo *ai_list, *ai_ptr;
 997         int              ai_return;
 998
 999         dprintf ("host = %s\n", host);
1000
1001         if (ping_host_search (obj->head, host) != NULL)
1002                 return (0);
1003
1004         memset (&ai_hints, '\0', sizeof (ai_hints));
1005         ai_hints.ai_flags     = 0;
1006 #ifdef AI_ADDRCONFIG
1007         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1008 #endif
1009 #ifdef AI_CANONNAME
1010         ai_hints.ai_flags    |= AI_CANONNAME;
1011 #endif
1012         ai_hints.ai_family    = obj->addrfamily;
1013         ai_hints.ai_socktype  = SOCK_RAW;
1014
1015         if ((ph = ping_alloc ()) == NULL)
1016         {
1017                 dprintf ("Out of memory!\n");
1018                 return (-1);
1019         }
1020
1021         if ((ph->hostname = strdup (host)) == NULL)
1022         {
1023                 dprintf ("Out of memory!\n");
1024                 ping_set_error (obj, "strdup", strerror (errno));
1025                 ping_free (ph);
1026                 return (-1);
1027         }
1028
1029         /* obj->data is not garuanteed to be != NULL */
1030         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1031         {
1032                 dprintf ("Out of memory!\n");
1033                 ping_set_error (obj, "strdup", strerror (errno));
1034                 ping_free (ph);
1035                 return (-1);
1036         }
1037
1038         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1039         {
1040                 dprintf ("getaddrinfo failed\n");
1041                 ping_set_error (obj, "getaddrinfo",
1042                                 (ai_return == EAI_SYSTEM)
1043                                 ? strerror (errno)
1044                                 : gai_strerror (ai_return));
1045                 ping_free (ph);
1046                 return (-1);
1047         }
1048
1049         if (ai_list == NULL)
1050                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1051
1052         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1053         {
1054                 ph->fd = -1;
1055
1056                 sockaddr_len = sizeof (sockaddr);
1057                 memset (&sockaddr, '\0', sockaddr_len);
1058
1059                 if (ai_ptr->ai_family == AF_INET)
1060                 {
1061                         struct sockaddr_in *si;
1062
1063                         si = (struct sockaddr_in *) &sockaddr;
1064                         si->sin_family = AF_INET;
1065                         si->sin_port   = htons (ph->ident);
1066                         si->sin_addr.s_addr = htonl (INADDR_ANY);
1067
1068                         ai_ptr->ai_socktype = SOCK_RAW;
1069                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1070                 }
1071                 else if (ai_ptr->ai_family == AF_INET6)
1072                 {
1073                         struct sockaddr_in6 *si;
1074
1075                         si = (struct sockaddr_in6 *) &sockaddr;
1076                         si->sin6_family = AF_INET6;
1077                         si->sin6_port   = htons (ph->ident);
1078                         si->sin6_addr   = in6addr_any;
1079
1080                         ai_ptr->ai_socktype = SOCK_RAW;
1081                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1082                 }
1083                 else
1084                 {
1085                         char errmsg[PING_ERRMSG_LEN];
1086
1087                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1088                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1089
1090                         dprintf (errmsg);
1091                         ping_set_error (obj, "getaddrinfo", errmsg);
1092                         continue;
1093                 }
1094
1095                 /* TODO: Move this to a static function `ping_open_socket' and
1096                  * call it whenever the socket dies. */
1097                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1098                 if (ph->fd == -1)
1099                 {
1100                         dprintf ("socket: %s\n", strerror (errno));
1101                         ping_set_error (obj, "socket", strerror (errno));
1102                         continue;
1103                 }
1104
1105                 if (obj->srcaddr != NULL)
1106                 {
1107                         assert (obj->srcaddrlen > 0);
1108                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1109
1110                         if (bind (ph->fd, (struct sockaddr *) obj->srcaddr, obj->srcaddrlen) == -1)
1111                         {
1112                                 dprintf ("bind: %s\n", strerror (errno));
1113                                 ping_set_error (obj, "bind", strerror (errno));
1114                                 close (ph->fd);
1115                                 ph->fd = -1;
1116                                 continue;
1117                         }
1118                 }
1119
1120                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1121                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1122                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1123                 ph->addrlen = ai_ptr->ai_addrlen;
1124                 ph->addrfamily = ai_ptr->ai_family;
1125
1126 #ifdef AI_CANONNAME
1127                 if ((ai_ptr->ai_canonname != NULL)
1128                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1129                 {
1130                         char *old_hostname;
1131
1132                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1133                                         ph->hostname, ai_ptr->ai_canonname);
1134
1135                         old_hostname = ph->hostname;
1136                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1137                         {
1138                                 /* strdup failed, falling back to old hostname */
1139                                 ph->hostname = old_hostname;
1140                         }
1141                         else if (old_hostname != NULL)
1142                         {
1143                                 free (old_hostname);
1144                         }
1145                 }
1146 #endif /* AI_CANONNAME */
1147
1148                 break;
1149         }
1150
1151         freeaddrinfo (ai_list);
1152
1153         if (ph->fd < 0)
1154         {
1155                 free (ph->hostname);
1156                 free (ph);
1157                 return (-1);
1158         }
1159
1160         /*
1161          * Adding in the front is much easier, but then the iterator will
1162          * return the host that was added last as first host. That's just not
1163          * nice. -octo
1164          */
1165         if (obj->head == NULL)
1166         {
1167                 obj->head = ph;
1168         }
1169         else
1170         {
1171                 pinghost_t *hptr;
1172
1173                 hptr = obj->head;
1174                 while (hptr->next != NULL)
1175                         hptr = hptr->next;
1176
1177                 assert ((hptr != NULL) && (hptr->next == NULL));
1178                 hptr->next = ph;
1179         }
1180
1181         ping_set_ttl (ph, obj->ttl);
1182
1183         return (0);
1184 }
1185
1186 int ping_host_remove (pingobj_t *obj, const char *host)
1187 {
1188         pinghost_t *pre, *cur;
1189
1190         pre = NULL;
1191         cur = obj->head;
1192
1193         while (cur != NULL)
1194         {
1195                 if (strcasecmp (host, cur->hostname))
1196                         break;
1197
1198                 pre = cur;
1199                 cur = cur->next;
1200         }
1201
1202         if (cur == NULL)
1203         {
1204                 ping_set_error (obj, "ping_host_remove", "Host not found");
1205                 return (-1);
1206         }
1207
1208         if (pre == NULL)
1209                 obj->head = cur->next;
1210         else
1211                 pre->next = cur->next;
1212
1213         if (cur->fd >= 0)
1214                 close (cur->fd);
1215
1216         ping_free (cur);
1217
1218         return (0);
1219 }
1220
1221 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1222 {
1223         return ((pingobj_iter_t *) obj->head);
1224 }
1225
1226 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1227 {
1228         return ((pingobj_iter_t *) iter->next);
1229 }
1230
1231 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1232                 void *buffer, size_t *buffer_len)
1233 {
1234         int ret = EINVAL;
1235
1236         size_t orig_buffer_len = *buffer_len;
1237
1238         switch (info)
1239         {
1240                 case PING_INFO_HOSTNAME:
1241                         ret = ENOMEM;
1242                         *buffer_len = strlen (iter->hostname);
1243                         if (orig_buffer_len <= *buffer_len)
1244                                 break;
1245                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1246                          * will copy `*buffer_len' and pad the rest of
1247                          * `buffer' with null-bytes */
1248                         strncpy (buffer, iter->hostname, orig_buffer_len);
1249                         ret = 0;
1250                         break;
1251
1252                 case PING_INFO_ADDRESS:
1253                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1254                                         iter->addrlen,
1255                                         (char *) buffer,
1256                                         *buffer_len,
1257                                         NULL, 0,
1258                                         NI_NUMERICHOST);
1259                         if (ret != 0)
1260                         {
1261                                 if ((ret == EAI_MEMORY)
1262 #ifdef EAI_OVERFLOW
1263                                                 || (ret == EAI_OVERFLOW)
1264 #endif
1265                                    )
1266                                         ret = ENOMEM;
1267                                 else if (ret == EAI_SYSTEM)
1268                                         /* XXX: Not thread-safe! */
1269                                         ret = errno;
1270                                 else
1271                                         ret = EINVAL;
1272                         }
1273                         break;
1274
1275                 case PING_INFO_FAMILY:
1276                         ret = ENOMEM;
1277                         *buffer_len = sizeof (int);
1278                         if (orig_buffer_len < sizeof (int))
1279                                 break;
1280                         *((int *) buffer) = iter->addrfamily;
1281                         ret = 0;
1282                         break;
1283
1284                 case PING_INFO_LATENCY:
1285                         ret = ENOMEM;
1286                         *buffer_len = sizeof (double);
1287                         if (orig_buffer_len < sizeof (double))
1288                                 break;
1289                         *((double *) buffer) = iter->latency;
1290                         ret = 0;
1291                         break;
1292
1293                 case PING_INFO_SEQUENCE:
1294                         ret = ENOMEM;
1295                         *buffer_len = sizeof (unsigned int);
1296                         if (orig_buffer_len < sizeof (unsigned int))
1297                                 break;
1298                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1299                         ret = 0;
1300                         break;
1301
1302                 case PING_INFO_IDENT:
1303                         ret = ENOMEM;
1304                         *buffer_len = sizeof (uint16_t);
1305                         if (orig_buffer_len < sizeof (uint16_t))
1306                                 break;
1307                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1308                         ret = 0;
1309                         break;
1310
1311                 case PING_INFO_DATA:
1312                         ret = ENOMEM;
1313                         *buffer_len = strlen (iter->data);
1314                         if (orig_buffer_len < *buffer_len)
1315                                 break;
1316                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1317                         ret = 0;
1318                         break;
1319         }
1320
1321         return (ret);
1322 }
1323
1324 void *ping_iterator_get_context (pingobj_iter_t *iter)
1325 {
1326         return (iter->context);
1327 }
1328
1329 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1330 {
1331         iter->context = context;
1332 }