src/liboping.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 library is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU Lesser General Public License as published by the
   7  * Free Software Foundation; either version 2.1 of the License, or (at your
   8  * option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
  13  * for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public License
  16  * along with this library; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin Street, 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 <inttypes.h>
  29 # include <errno.h>
  30 # include <assert.h>
  31 #else
  32 # error "You don't have the standard C99 header files installed"
  33 #endif /* STDC_HEADERS */
  34
  35 #ifdef HAVE_STDINT_H
  36 # include <stdint.h>
  37 #endif
  38
  39 #if HAVE_UNISTD_H
  40 # include <unistd.h>
  41 #endif
  42
  43 #if HAVE_FCNTL_H
  44 # include <fcntl.h>
  45 #endif
  46 #if HAVE_SYS_TYPES_H
  47 # include <sys/types.h>
  48 #endif
  49 #if HAVE_SYS_STAT_H
  50 # include <sys/stat.h>
  51 #endif
  52
  53 #if TIME_WITH_SYS_TIME
  54 # include <sys/time.h>
  55 # include <time.h>
  56 #else
  57 # if HAVE_SYS_TIME_H
  58 #  include <sys/time.h>
  59 # else
  60 #  include <time.h>
  61 # endif
  62 #endif
  63
  64 #if HAVE_SYS_SOCKET_H
  65 # include <sys/socket.h>
  66 #endif
  67
  68 #if HAVE_NETDB_H
  69 # include <netdb.h>
  70 #endif
  71
  72 #if HAVE_NETINET_IN_SYSTM_H
  73 # include <netinet/in_systm.h>
  74 #endif
  75 #if HAVE_NETINET_IN_H
  76 # include <netinet/in.h>
  77 #endif
  78 #if HAVE_NETINET_IP_H
  79 # include <netinet/ip.h>
  80 #endif
  81 #if HAVE_NETINET_IP_ICMP_H
  82 # include <netinet/ip_icmp.h>
  83 #endif
  84 #ifdef HAVE_NETINET_IP_VAR_H
  85 # include <netinet/ip_var.h>
  86 #endif
  87 #if HAVE_NETINET_IP6_H
  88 # include <netinet/ip6.h>
  89 #endif
  90 #if HAVE_NETINET_ICMP6_H
  91 # include <netinet/icmp6.h>
  92 #endif
  93
  94 #include "oping.h"
  95
  96 #if WITH_DEBUG
  97 # define dprintf(...) printf ("%s[%4i]: %-20s: ", __FILE__, __LINE__, __FUNCTION__); printf (__VA_ARGS__)
  98 #else
  99 # define dprintf(...) /**/
 100 #endif
 101
 102 #define PING_ERRMSG_LEN 256
 103
 104 struct pinghost
 105 {
 106         /* username: name passed in by the user */
 107         char                    *username;
 108         /* hostname: name returned by the reverse lookup */
 109         char                    *hostname;
 110         struct sockaddr_storage *addr;
 111         socklen_t                addrlen;
 112         int                      addrfamily;
 113         int                      fd;
 114         int                      ident;
 115         int                      sequence;
 116         struct timeval          *timer;
 117         double                   latency;
 118         uint32_t                 dropped;
 119         int                      recv_ttl;
 120         uint8_t                  recv_tos;
 121         char                    *data;
 122
 123         void                    *context;
 124
 125         struct pinghost         *next;
 126 };
 127
 128 struct pingobj
 129 {
 130         double                   timeout;
 131         int                      ttl;
 132         int                      addrfamily;
 133         uint8_t                  tos;
 134         char                    *data;
 135
 136         struct sockaddr         *srcaddr;
 137         socklen_t                srcaddrlen;
 138
 139         char                    *device;
 140
 141         char                     errmsg[PING_ERRMSG_LEN];
 142
 143         pinghost_t              *head;
 144 };
 145
 146 /*
 147  * private (static) functions
 148  */
 149 /* Even though Posix requires "strerror_r" to return an "int",
 150  * some systems (e.g. the GNU libc) return a "char *" _and_
 151  * ignore the second argument ... -tokkee */
 152 static char *sstrerror (int errnum, char *buf, size_t buflen)
 153 {
 154         buf[0] = 0;
 155
 156 #if !HAVE_STRERROR_R
 157         {
 158                 snprintf (buf, buflen, "Error %i (%#x)", errnum, errnum);
 159         }
 160 /* #endif !HAVE_STRERROR_R */
 161
 162 #elif STRERROR_R_CHAR_P
 163         {
 164                 char *temp;
 165                 temp = strerror_r (errnum, buf, buflen);
 166                 if (buf[0] == 0)
 167                 {
 168                         if ((temp != NULL) && (temp != buf) && (temp[0] != 0))
 169                                 strncpy (buf, temp, buflen);
 170                         else
 171                                 strncpy (buf, "strerror_r did not return "
 172                                                 "an error message", buflen);
 173                 }
 174         }
 175 /* #endif STRERROR_R_CHAR_P */
 176
 177 #else
 178         if (strerror_r (errnum, buf, buflen) != 0)
 179         {
 180                 snprintf (buf, buflen, "Error %i (%#x); "
 181                                 "Additionally, strerror_r failed.",
 182                                 errnum, errnum);
 183         }
 184 #endif /* STRERROR_R_CHAR_P */
 185
 186         buf[buflen - 1] = 0;
 187
 188         return (buf);
 189 } /* char *sstrerror */
 190
 191 static void ping_set_error (pingobj_t *obj, const char *function,
 192                 const char *message)
 193 {
 194         snprintf (obj->errmsg, sizeof (obj->errmsg),
 195                         "%s: %s", function, message);
 196         obj->errmsg[sizeof (obj->errmsg) - 1] = 0;
 197 }
 198
 199 static void ping_set_errno (pingobj_t *obj, int error_number)
 200 {
 201         sstrerror (error_number, obj->errmsg, sizeof (obj->errmsg));
 202 }
 203
 204 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
 205                 struct timeval *res)
 206 {
 207         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
 208         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
 209
 210         while (res->tv_usec > 1000000)
 211         {
 212                 res->tv_usec -= 1000000;
 213                 res->tv_sec++;
 214         }
 215
 216         return (0);
 217 }
 218
 219 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
 220                 struct timeval *res)
 221 {
 222         if ((tv1->tv_sec < tv2->tv_sec)
 223                         || ((tv1->tv_sec == tv2->tv_sec)
 224                                 && (tv1->tv_usec < tv2->tv_usec)))
 225                 return (-1);
 226
 227         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
 228         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
 229
 230         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec >= 0)));
 231
 232         while (res->tv_usec < 0)
 233         {
 234                 res->tv_usec += 1000000;
 235                 res->tv_sec--;
 236         }
 237
 238         return (0);
 239 }
 240
 241 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
 242 {
 243         uint32_t sum = 0;
 244         uint16_t ret = 0;
 245
 246         uint16_t *ptr;
 247
 248         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
 249                 sum += *ptr;
 250
 251         if (len == 1)
 252         {
 253                 *(char *) &ret = *(char *) ptr;
 254                 sum += ret;
 255         }
 256
 257         /* Do this twice to get all possible carries.. */
 258         sum = (sum >> 16) + (sum & 0xFFFF);
 259         sum = (sum >> 16) + (sum & 0xFFFF);
 260
 261         ret = ~sum;
 262
 263         return (ret);
 264 }
 265
 266 static pinghost_t *ping_receive_ipv4 (pingobj_t *obj, char *buffer,
 267                 size_t buffer_len)
 268 {
 269         struct ip *ip_hdr;
 270         struct icmp *icmp_hdr;
 271
 272         size_t ip_hdr_len;
 273
 274         uint16_t recv_checksum;
 275         uint16_t calc_checksum;
 276
 277         uint16_t ident;
 278         uint16_t seq;
 279
 280         pinghost_t *ptr;
 281
 282         if (buffer_len < sizeof (struct ip))
 283                 return (NULL);
 284
 285         ip_hdr     = (struct ip *) buffer;
 286         ip_hdr_len = ip_hdr->ip_hl << 2;
 287
 288         if (buffer_len < ip_hdr_len)
 289                 return (NULL);
 290
 291         buffer     += ip_hdr_len;
 292         buffer_len -= ip_hdr_len;
 293
 294         if (buffer_len < sizeof (struct icmp))
 295                 return (NULL);
 296
 297         icmp_hdr = (struct icmp *) buffer;
 298         buffer     += sizeof (struct icmp);
 299         buffer_len -= sizeof (struct icmp);
 300
 301         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
 302         {
 303                 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
 304                 return (NULL);
 305         }
 306
 307         recv_checksum = icmp_hdr->icmp_cksum;
 308         icmp_hdr->icmp_cksum = 0;
 309         calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
 310                         sizeof (struct icmp) + buffer_len);
 311
 312         if (recv_checksum != calc_checksum)
 313         {
 314                 dprintf ("Checksum missmatch: Got 0x%04"PRIx16", "
 315                                 "calculated 0x%04"PRIx16"\n",
 316                                 recv_checksum, calc_checksum);
 317                 return (NULL);
 318         }
 319
 320         ident = ntohs (icmp_hdr->icmp_id);
 321         seq   = ntohs (icmp_hdr->icmp_seq);
 322
 323         /* We have to iterate over all hosts, since ICMPv4 packets may
 324          * be received on any raw v4 socket. */
 325         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 326         {
 327                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 328                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 329
 330                 if (ptr->addrfamily != AF_INET)
 331                         continue;
 332
 333                 if (!timerisset (ptr->timer))
 334                         continue;
 335
 336                 if (ptr->ident != ident)
 337                         continue;
 338
 339                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 340                         continue;
 341
 342                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
 343                                 "seq = %"PRIu16"\n",
 344                                 ptr->hostname, ident, seq);
 345
 346                 break;
 347         }
 348
 349         if (ptr == NULL)
 350         {
 351                 dprintf ("No match found for ident = 0x%04"PRIx16", seq = %"PRIu16"\n",
 352                                 ident, seq);
 353         }
 354
 355         if (ptr != NULL){
 356                 ptr->recv_ttl = (int)     ip_hdr->ip_ttl;
 357                 ptr->recv_tos = (uint8_t) ip_hdr->ip_tos;
 358         }
 359         return (ptr);
 360 }
 361
 362 #ifndef ICMP6_ECHO_REQUEST
 363 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
 364 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
 365 # else
 366 #  define ICMP6_ECHO_REQUEST 128
 367 # endif
 368 #endif
 369
 370 #ifndef ICMP6_ECHO_REPLY
 371 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
 372 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
 373 # else
 374 #  define ICMP6_ECHO_REPLY 129
 375 # endif
 376 #endif
 377
 378 static pinghost_t *ping_receive_ipv6 (pingobj_t *obj, char *buffer,
 379                 size_t buffer_len)
 380 {
 381         struct icmp6_hdr *icmp_hdr;
 382
 383         uint16_t ident;
 384         uint16_t seq;
 385
 386         pinghost_t *ptr;
 387
 388         if (buffer_len < sizeof (struct icmp6_hdr))
 389                 return (NULL);
 390
 391         icmp_hdr = (struct icmp6_hdr *) buffer;
 392         buffer     += sizeof (struct icmp);
 393         buffer_len -= sizeof (struct icmp);
 394
 395         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 396         {
 397                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 398                 return (NULL);
 399         }
 400
 401         if (icmp_hdr->icmp6_code != 0)
 402         {
 403                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 404                 return (NULL);
 405         }
 406
 407         ident = ntohs (icmp_hdr->icmp6_id);
 408         seq   = ntohs (icmp_hdr->icmp6_seq);
 409
 410         /* We have to iterate over all hosts, since ICMPv6 packets may
 411          * be received on any raw v6 socket. */
 412         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 413         {
 414                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 415                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 416
 417                 if (ptr->addrfamily != AF_INET6)
 418                         continue;
 419
 420                 if (!timerisset (ptr->timer))
 421                         continue;
 422
 423                 if (ptr->ident != ident)
 424                         continue;
 425
 426                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 427                         continue;
 428
 429                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
 430                                 "seq = %"PRIu16"\n",
 431                                 ptr->hostname, ident, seq);
 432
 433                 break;
 434         }
 435
 436         if (ptr == NULL)
 437         {
 438                 dprintf ("No match found for ident = 0x%04"PRIx16", "
 439                                 "seq = %"PRIu16"\n",
 440                                 ident, seq);
 441         }
 442
 443         return (ptr);
 444 }
 445
 446 static int ping_receive_one (pingobj_t *obj, const pinghost_t *ph,
 447                 struct timeval *now)
 448 {
 449         /* Note: 'ph' is not necessarily the host object for which we receive a
 450          * reply. The right object will be returned by ping_receive_ipv*(). For
 451          * now, we can only rely on ph->fd and ph->addrfamily. */
 452
 453         struct timeval diff;
 454         pinghost_t *host = NULL;
 455         int recv_ttl;
 456         uint8_t recv_tos;
 457
 458         /*
 459          * Set up the receive buffer..
 460          */
 461         struct msghdr msghdr;
 462         struct cmsghdr *cmsg;
 463         char payload_buffer[4096];
 464         ssize_t payload_buffer_len;
 465         char control_buffer[4096];
 466         struct iovec payload_iovec;
 467
 468         memset (&payload_iovec, 0, sizeof (payload_iovec));
 469         payload_iovec.iov_base = payload_buffer;
 470         payload_iovec.iov_len = sizeof (payload_buffer);
 471
 472         memset (&msghdr, 0, sizeof (msghdr));
 473         /* unspecified source address */
 474         msghdr.msg_name = NULL;
 475         msghdr.msg_namelen = 0;
 476         /* output buffer vector, see readv(2) */
 477         msghdr.msg_iov = &payload_iovec;
 478         msghdr.msg_iovlen = 1;
 479         /* output buffer for control messages */
 480         msghdr.msg_control = control_buffer;
 481         msghdr.msg_controllen = sizeof (control_buffer);
 482         /* flags; this is an output only field.. */
 483         msghdr.msg_flags = 0;
 484 #ifdef MSG_XPG4_2
 485         msghdr.msg_flags |= MSG_XPG4_2;
 486 #endif
 487
 488         payload_buffer_len = recvmsg (ph->fd, &msghdr, /* flags = */ 0);
 489         if (payload_buffer_len < 0)
 490         {
 491 #if WITH_DEBUG
 492                 char errbuf[PING_ERRMSG_LEN];
 493                 dprintf ("recvfrom: %s\n",
 494                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 495 #endif
 496                 return (-1);
 497         }
 498         dprintf ("Read %zi bytes from fd = %i\n", payload_buffer_len, ph->fd);
 499
 500         /* Iterate over all auxiliary data in msghdr */
 501         recv_ttl = -1;
 502         recv_tos = 0xff;
 503         for (cmsg = CMSG_FIRSTHDR (&msghdr); /* {{{ */
 504                         cmsg != NULL;
 505                         cmsg = CMSG_NXTHDR (&msghdr, cmsg))
 506         {
 507                 if (ph->addrfamily == AF_INET) /* {{{ */
 508                 {
 509                         if (cmsg->cmsg_level != IPPROTO_IP)
 510                                 continue;
 511
 512                         if (cmsg->cmsg_type == IP_TOS)
 513                         {
 514                                 memcpy (&recv_tos, CMSG_DATA (cmsg),
 515                                                 sizeof (recv_tos));
 516                                 dprintf ("TOSv4 = 0x%02"PRIx8";\n", recv_tos);
 517                         } else
 518                         if (cmsg->cmsg_type == IP_TTL)
 519                         {
 520                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 521                                                 sizeof (recv_ttl));
 522                                 dprintf ("TTLv4 = %i;\n", recv_ttl);
 523                         }
 524                         else
 525                         {
 526                                 dprintf ("Not handling option %i.\n",
 527                                                 cmsg->cmsg_type);
 528                         }
 529                 } /* }}} */
 530                 else if (ph->addrfamily == AF_INET6) /* {{{ */
 531                 {
 532                         if (cmsg->cmsg_level != IPPROTO_IPV6)
 533                                 continue;
 534
 535                         if (cmsg->cmsg_type == IPV6_TCLASS)
 536                         {
 537                                 memcpy (&recv_tos, CMSG_DATA (cmsg),
 538                                                 sizeof (recv_tos));
 539                                 dprintf ("TOSv6 = 0x%02"PRIx8";\n", recv_tos);
 540                         } else
 541                         if (cmsg->cmsg_type == IPV6_HOPLIMIT)
 542                         {
 543                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 544                                                 sizeof (recv_ttl));
 545                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 546                         }
 547                         else
 548                         {
 549                                 dprintf ("Not handling option %i.\n",
 550                                                 cmsg->cmsg_type);
 551                         }
 552                 } /* }}} */
 553                 else
 554                 {
 555                         dprintf ("Don't know how to handle "
 556                                         "unknown protocol %i.\n",
 557                                         cmsg->cmsg_level);
 558                 }
 559         } /* }}} for (cmsg) */
 560
 561         if (ph->addrfamily == AF_INET)
 562         {
 563                 host = ping_receive_ipv4 (obj, payload_buffer, payload_buffer_len);
 564                 if (host == NULL)
 565                         return (-1);
 566         }
 567         else if (ph->addrfamily == AF_INET6)
 568         {
 569                 host = ping_receive_ipv6 (obj, payload_buffer, payload_buffer_len);
 570                 if (host == NULL)
 571                         return (-1);
 572         }
 573         else
 574         {
 575                 dprintf ("ping_receive_one: Unknown address family %i.\n",
 576                                 ph->addrfamily);
 577                 return (-1);
 578         }
 579
 580         dprintf ("rcvd: %12i.%06i\n",
 581                         (int) now->tv_sec,
 582                         (int) now->tv_usec);
 583         dprintf ("sent: %12i.%06i\n",
 584                         (int) host->timer->tv_sec,
 585                         (int) host->timer->tv_usec);
 586
 587         if (ping_timeval_sub (now, host->timer, &diff) < 0)
 588         {
 589                 timerclear (host->timer);
 590                 return (-1);
 591         }
 592
 593         dprintf ("diff: %12i.%06i\n",
 594                         (int) diff.tv_sec,
 595                         (int) diff.tv_usec);
 596
 597         if (recv_ttl >= 0)
 598                 host->recv_ttl = recv_ttl;
 599         if (recv_tos != 0xffff)
 600                 host->recv_tos = recv_tos;
 601
 602         host->latency  = ((double) diff.tv_usec) / 1000.0;
 603         host->latency += ((double) diff.tv_sec)  * 1000.0;
 604
 605         timerclear (host->timer);
 606
 607         return (0);
 608 }
 609
 610 static int ping_receive_all (pingobj_t *obj)
 611 {
 612         fd_set read_fds;
 613         fd_set err_fds;
 614         int num_fds;
 615         int max_fd;
 616
 617         pinghost_t *ph;
 618         pinghost_t *ptr;
 619
 620         struct timeval endtime;
 621         struct timeval nowtime;
 622         struct timeval timeout;
 623         int status;
 624
 625         int ret;
 626
 627         ph = obj->head;
 628         ret = 0;
 629
 630         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 631         {
 632                 ptr->latency  = -1.0;
 633                 ptr->recv_ttl = -1;
 634         }
 635
 636         if (gettimeofday (&nowtime, NULL) == -1)
 637         {
 638                 ping_set_errno (obj, errno);
 639                 return (-1);
 640         }
 641
 642         /* Set up timeout */
 643         timeout.tv_sec = (time_t) obj->timeout;
 644         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 645
 646         dprintf ("Set timeout to %i.%06i seconds\n",
 647                         (int) timeout.tv_sec,
 648                         (int) timeout.tv_usec);
 649
 650         ping_timeval_add (&nowtime, &timeout, &endtime);
 651
 652         while (1)
 653         {
 654                 FD_ZERO (&read_fds);
 655                 FD_ZERO (&err_fds);
 656                 num_fds =  0;
 657                 max_fd = -1;
 658
 659                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 660                 {
 661                         if (!timerisset (ptr->timer))
 662                                 continue;
 663
 664                         FD_SET (ptr->fd, &read_fds);
 665                         FD_SET (ptr->fd, &err_fds);
 666                         num_fds++;
 667
 668                         if (max_fd < ptr->fd)
 669                                 max_fd = ptr->fd;
 670                 }
 671
 672                 if (num_fds == 0)
 673                         break;
 674
 675                 if (gettimeofday (&nowtime, NULL) == -1)
 676                 {
 677                         ping_set_errno (obj, errno);
 678                         return (-1);
 679                 }
 680
 681                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 682                         break;
 683
 684                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_fds,
 685                                 (int) timeout.tv_sec,
 686                                 (int) timeout.tv_usec);
 687
 688                 status = select (max_fd + 1, &read_fds, NULL, &err_fds, &timeout);
 689
 690                 if (gettimeofday (&nowtime, NULL) == -1)
 691                 {
 692                         ping_set_errno (obj, errno);
 693                         return (-1);
 694                 }
 695
 696                 if ((status == -1) && (errno == EINTR))
 697                 {
 698                         dprintf ("select was interrupted by signal..\n");
 699                         continue;
 700                 }
 701                 else if (status < 0)
 702                 {
 703 #if WITH_DEBUG
 704                         char errbuf[PING_ERRMSG_LEN];
 705                         dprintf ("select: %s\n",
 706                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 707 #endif
 708                         break;
 709                 }
 710                 else if (status == 0)
 711                 {
 712                         dprintf ("select timed out\n");
 713                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 714                                 if (ptr->latency < 0.0)
 715                                         ptr->dropped++;
 716                         break;
 717                 }
 718
 719                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 720                 {
 721                         if (FD_ISSET (ptr->fd, &read_fds))
 722                         {
 723                                 if (ping_receive_one (obj, ptr, &nowtime) == 0)
 724                                         ret++;
 725                         }
 726                         else if (FD_ISSET (ptr->fd, &err_fds))
 727                         {
 728                                 /* clear the timer in this case so that we
 729                                  * don't run into an endless loop. */
 730                                 /* TODO: Set an error flag in this case. */
 731                                 timerclear (ptr->timer);
 732                         }
 733                 }
 734         } /* while (1) */
 735
 736         return (ret);
 737 }
 738
 739 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 740  * Sending functions:                                                        *
 741  *                                                                           *
 742  * ping_send_all                                                             *
 743  * +-> ping_send_one_ipv4                                                    *
 744  * `-> ping_send_one_ipv6                                                    *
 745  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 746 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 747                 const void *buf, size_t buflen)
 748 {
 749         ssize_t ret;
 750
 751         if (gettimeofday (ph->timer, NULL) == -1)
 752         {
 753                 timerclear (ph->timer);
 754                 return (-1);
 755         }
 756
 757         ret = sendto (ph->fd, buf, buflen, 0,
 758                         (struct sockaddr *) ph->addr, ph->addrlen);
 759
 760         if (ret < 0)
 761         {
 762 #if defined(EHOSTUNREACH)
 763                 if (errno == EHOSTUNREACH)
 764                         return (0);
 765 #endif
 766 #if defined(ENETUNREACH)
 767                 if (errno == ENETUNREACH)
 768                         return (0);
 769 #endif
 770                 ping_set_errno (obj, errno);
 771         }
 772
 773         return (ret);
 774 }
 775
 776 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 777 {
 778         struct icmp *icmp4;
 779         int status;
 780
 781         char buf[4096];
 782         int  buflen;
 783
 784         char *data;
 785         int   datalen;
 786
 787         dprintf ("ph->hostname = %s\n", ph->hostname);
 788
 789         memset (buf, '\0', sizeof (buf));
 790         icmp4 = (struct icmp *) buf;
 791         data  = (char *) (icmp4 + 1);
 792
 793         icmp4->icmp_type  = ICMP_ECHO;
 794         icmp4->icmp_code  = 0;
 795         icmp4->icmp_cksum = 0;
 796         icmp4->icmp_id    = htons (ph->ident);
 797         icmp4->icmp_seq   = htons (ph->sequence);
 798
 799         buflen = 4096 - sizeof (struct icmp);
 800         strncpy (data, ph->data, buflen);
 801         datalen = strlen (data);
 802
 803         buflen = datalen + sizeof (struct icmp);
 804
 805         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 806
 807         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 808
 809         status = ping_sendto (obj, ph, buf, buflen);
 810         if (status < 0)
 811         {
 812                 perror ("ping_sendto");
 813                 return (-1);
 814         }
 815
 816         dprintf ("sendto: status = %i\n", status);
 817
 818         return (0);
 819 }
 820
 821 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 822 {
 823         struct icmp6_hdr *icmp6;
 824         int status;
 825
 826         char buf[4096];
 827         int  buflen;
 828
 829         char *data;
 830         int   datalen;
 831
 832         dprintf ("ph->hostname = %s\n", ph->hostname);
 833
 834         memset (buf, '\0', sizeof (buf));
 835         icmp6 = (struct icmp6_hdr *) buf;
 836         data  = (char *) (icmp6 + 1);
 837
 838         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 839         icmp6->icmp6_code  = 0;
 840         /* The checksum will be calculated by the TCP/IP stack.  */
 841         /* FIXME */
 842         icmp6->icmp6_cksum = 0;
 843         icmp6->icmp6_id    = htons (ph->ident);
 844         icmp6->icmp6_seq   = htons (ph->sequence);
 845
 846         buflen = 4096 - sizeof (struct icmp6_hdr);
 847         strncpy (data, ph->data, buflen);
 848         datalen = strlen (data);
 849
 850         buflen = datalen + sizeof (struct icmp6_hdr);
 851
 852         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 853
 854         status = ping_sendto (obj, ph, buf, buflen);
 855         if (status < 0)
 856         {
 857                 perror ("ping_sendto");
 858                 return (-1);
 859         }
 860
 861         dprintf ("sendto: status = %i\n", status);
 862
 863         return (0);
 864 }
 865
 866 static int ping_send_all (pingobj_t *obj)
 867 {
 868         pinghost_t *ph;
 869         pinghost_t *ptr;
 870
 871         int ret;
 872
 873         ret = 0;
 874         ph = obj->head;
 875
 876         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 877         {
 878                 /* start timer.. The GNU `ping6' starts the timer before
 879                  * sending the packet, so I will do that too */
 880                 if (gettimeofday (ptr->timer, NULL) == -1)
 881                 {
 882 #if WITH_DEBUG
 883                         char errbuf[PING_ERRMSG_LEN];
 884                         dprintf ("gettimeofday: %s\n",
 885                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 886 #endif
 887                         timerclear (ptr->timer);
 888                         ret--;
 889                         continue;
 890                 }
 891                 else
 892                 {
 893                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 894                 }
 895
 896                 if (ptr->addrfamily == AF_INET6)
 897                 {
 898                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 899                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 900                         {
 901                                 timerclear (ptr->timer);
 902                                 ret--;
 903                                 continue;
 904                         }
 905                 }
 906                 else if (ptr->addrfamily == AF_INET)
 907                 {
 908                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 909                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 910                         {
 911                                 timerclear (ptr->timer);
 912                                 ret--;
 913                                 continue;
 914                         }
 915                 }
 916                 else /* this should not happen */
 917                 {
 918                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 919                         timerclear (ptr->timer);
 920                         ret--;
 921                         continue;
 922                 }
 923
 924                 ptr->sequence++;
 925         }
 926
 927         return (ret);
 928 }
 929
 930 /*
 931  * Set the TTL of a socket protocol independently.
 932  */
 933 static int ping_set_ttl (pinghost_t *ph, int ttl)
 934 {
 935         int ret = -2;
 936
 937         if (ph->addrfamily == AF_INET)
 938         {
 939                 dprintf ("Setting TTLv4 to %i\n", ttl);
 940                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL,
 941                                 &ttl, sizeof (ttl));
 942         }
 943         else if (ph->addrfamily == AF_INET6)
 944         {
 945                 dprintf ("Setting TTLv6 to %i\n", ttl);
 946                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
 947                                 &ttl, sizeof (ttl));
 948         }
 949
 950         return (ret);
 951 }
 952
 953 /*
 954  * Set the TOS of a socket protocol independently.
 955  *
 956  * Using SOL_SOCKET / SO_PRIORITY might be a protocol independent way to
 957  * set this. See socket(7) for details.
 958  */
 959 static int ping_set_tos (pingobj_t *obj, pinghost_t *ph, uint8_t tos)
 960 {
 961         int ret = EINVAL;
 962         char errbuf[PING_ERRMSG_LEN];
 963
 964         if (ph->addrfamily == AF_INET)
 965         {
 966                 dprintf ("Setting TP_TOS to %#04"PRIx8"\n", tos);
 967                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TOS,
 968                                 &tos, sizeof (tos));
 969                 if (ret != 0)
 970                 {
 971                         ret = errno;
 972                         ping_set_error (obj, "ping_set_tos",
 973                                         sstrerror (ret, errbuf, sizeof (errbuf)));
 974                         dprintf ("Setting TP_TOS failed: %s\n", errbuf);
 975                 }
 976         }
 977         else if (ph->addrfamily == AF_INET6)
 978         {
 979                 /* IPV6_TCLASS requires an "int". */
 980                 int tmp = (int) tos;
 981
 982                 dprintf ("Setting IPV6_TCLASS to %#04"PRIx8" (%i)\n", tos, tmp);
 983                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_TCLASS,
 984                                 &tmp, sizeof (tmp));
 985                 if (ret != 0)
 986                 {
 987                         ret = errno;
 988                         ping_set_error (obj, "ping_set_tos",
 989                                         sstrerror (ret, errbuf, sizeof (errbuf)));
 990                         dprintf ("Setting IPV6_TCLASS failed: %s\n", errbuf);
 991                 }
 992         }
 993
 994         return (ret);
 995 }
 996
 997 static int ping_get_ident (void)
 998 {
 999         int fd;
1000         static int did_seed = 0;
1001
1002         int retval;
1003
1004         if (did_seed == 0)
1005         {
1006                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
1007                 {
1008                         unsigned int seed;
1009
1010                         if (read (fd, &seed, sizeof (seed)) != -1)
1011                         {
1012                                 did_seed = 1;
1013                                 dprintf ("Random seed:   %#x\n", seed);
1014                                 srandom (seed);
1015                         }
1016
1017                         close (fd);
1018                 }
1019 #if WITH_DEBUG
1020                 else
1021                 {
1022                         char errbuf[PING_ERRMSG_LEN];
1023                         dprintf ("open (/dev/urandom): %s\n",
1024                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1025                 }
1026 #endif
1027         }
1028
1029         retval = (int) random ();
1030
1031         dprintf ("Random number: %#x\n", retval);
1032
1033         return (retval);
1034 }
1035
1036 static pinghost_t *ping_alloc (void)
1037 {
1038         pinghost_t *ph;
1039         size_t      ph_size;
1040
1041         ph_size = sizeof (pinghost_t)
1042                 + sizeof (struct sockaddr_storage)
1043                 + sizeof (struct timeval);
1044
1045         ph = (pinghost_t *) malloc (ph_size);
1046         if (ph == NULL)
1047                 return (NULL);
1048
1049         memset (ph, '\0', ph_size);
1050
1051         ph->timer   = (struct timeval *) (ph + 1);
1052         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
1053
1054         ph->addrlen = sizeof (struct sockaddr_storage);
1055         ph->fd      = -1;
1056         ph->latency = -1.0;
1057         ph->dropped = 0;
1058         ph->ident   = ping_get_ident () & 0xFFFF;
1059
1060         return (ph);
1061 }
1062
1063 static void ping_free (pinghost_t *ph)
1064 {
1065         if (ph->fd >= 0)
1066                 close (ph->fd);
1067
1068         if (ph->username != NULL)
1069                 free (ph->username);
1070
1071         if (ph->hostname != NULL)
1072                 free (ph->hostname);
1073
1074         if (ph->data != NULL)
1075                 free (ph->data);
1076
1077         free (ph);
1078 }
1079
1080 /*
1081  * public methods
1082  */
1083 const char *ping_get_error (pingobj_t *obj)
1084 {
1085         if (obj == NULL)
1086                 return (NULL);
1087         return (obj->errmsg);
1088 }
1089
1090 pingobj_t *ping_construct (void)
1091 {
1092         pingobj_t *obj;
1093
1094         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
1095                 return (NULL);
1096         memset (obj, 0, sizeof (pingobj_t));
1097
1098         obj->timeout    = PING_DEF_TIMEOUT;
1099         obj->ttl        = PING_DEF_TTL;
1100         obj->addrfamily = PING_DEF_AF;
1101         obj->data       = strdup (PING_DEF_DATA);
1102         obj->tos        = 0;
1103
1104         return (obj);
1105 }
1106
1107 void ping_destroy (pingobj_t *obj)
1108 {
1109         pinghost_t *current;
1110         pinghost_t *next;
1111
1112         if (obj == NULL)
1113                 return;
1114
1115         current = obj->head;
1116         next = NULL;
1117
1118         while (current != NULL)
1119         {
1120                 next = current->next;
1121                 ping_free (current);
1122                 current = next;
1123         }
1124
1125         if (obj->data != NULL)
1126                 free (obj->data);
1127
1128         if (obj->srcaddr != NULL)
1129                 free (obj->srcaddr);
1130
1131         if (obj->device != NULL)
1132                 free (obj->device);
1133
1134         free (obj);
1135
1136         return;
1137 }
1138
1139 int ping_setopt (pingobj_t *obj, int option, void *value)
1140 {
1141         int ret = 0;
1142
1143         if ((obj == NULL) || (value == NULL))
1144                 return (-1);
1145
1146         switch (option)
1147         {
1148                 case PING_OPT_TOS:
1149                 {
1150                         pinghost_t *ph;
1151
1152                         obj->tos = *((uint8_t *) value);
1153                         for (ph = obj->head; ph != NULL; ph = ph->next)
1154                                 ping_set_tos (obj, ph, obj->tos);
1155                         break;
1156                 }
1157
1158                 case PING_OPT_TIMEOUT:
1159                         obj->timeout = *((double *) value);
1160                         if (obj->timeout < 0.0)
1161                         {
1162                                 obj->timeout = PING_DEF_TIMEOUT;
1163                                 ret = -1;
1164                         }
1165                         break;
1166
1167                 case PING_OPT_TTL:
1168                         obj->ttl = *((int *) value);
1169                         if ((obj->ttl < 1) || (obj->ttl > 255))
1170                         {
1171                                 obj->ttl = PING_DEF_TTL;
1172                                 ret = -1;
1173                         }
1174                         else
1175                         {
1176                                 pinghost_t *ph;
1177
1178                                 for (ph = obj->head; ph != NULL; ph = ph->next)
1179                                         ping_set_ttl (ph, obj->ttl);
1180                         }
1181                         break;
1182
1183                 case PING_OPT_AF:
1184                         obj->addrfamily = *((int *) value);
1185                         if ((obj->addrfamily != AF_UNSPEC)
1186                                         && (obj->addrfamily != AF_INET)
1187                                         && (obj->addrfamily != AF_INET6))
1188                         {
1189                                 obj->addrfamily = PING_DEF_AF;
1190                                 ret = -1;
1191                         }
1192                         if (obj->srcaddr != NULL)
1193                         {
1194                                 free (obj->srcaddr);
1195                                 obj->srcaddr = NULL;
1196                         }
1197                         break;
1198
1199                 case PING_OPT_DATA:
1200                         if (obj->data != NULL)
1201                         {
1202                                 free (obj->data);
1203                                 obj->data = NULL;
1204                         }
1205                         obj->data = strdup ((const char *) value);
1206                         break;
1207
1208                 case PING_OPT_SOURCE:
1209                 {
1210                         char            *hostname = (char *) value;
1211                         struct addrinfo  ai_hints;
1212                         struct addrinfo *ai_list;
1213                         int              status;
1214 #if WITH_DEBUG
1215                         if (obj->addrfamily != AF_UNSPEC)
1216                         {
1217                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1218                         }
1219 #endif
1220                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1221                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1222 #if defined(AI_ADDRCONFIG)
1223                         ai_hints.ai_flags = AI_ADDRCONFIG;
1224 #endif
1225                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1226                         if (status != 0)
1227                         {
1228 #if defined(EAI_SYSTEM)
1229                                 char errbuf[PING_ERRMSG_LEN];
1230 #endif
1231                                 ping_set_error (obj, "getaddrinfo",
1232 #if defined(EAI_SYSTEM)
1233                                                 (status == EAI_SYSTEM)
1234                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1235 #endif
1236                                                 gai_strerror (status));
1237                                 ret = -1;
1238                                 break;
1239                         }
1240 #if WITH_DEBUG
1241                         if (ai_list->ai_next != NULL)
1242                         {
1243                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1244                         }
1245 #endif
1246                         if (obj->srcaddr == NULL)
1247                         {
1248                                 obj->srcaddrlen = 0;
1249                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1250                                 if (obj->srcaddr == NULL)
1251                                 {
1252                                         ping_set_errno (obj, errno);
1253                                         ret = -1;
1254                                         freeaddrinfo (ai_list);
1255                                         break;
1256                                 }
1257                         }
1258                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1259                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1260                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1261                                         ai_list->ai_addrlen);
1262                         obj->srcaddrlen = ai_list->ai_addrlen;
1263                         obj->addrfamily = ai_list->ai_family;
1264
1265                         freeaddrinfo (ai_list);
1266                 } /* case PING_OPT_SOURCE */
1267                 break;
1268
1269                 case PING_OPT_DEVICE:
1270                 {
1271 #ifdef SO_BINDTODEVICE
1272                         char *device = strdup ((char *) value);
1273
1274                         if (device == NULL)
1275                         {
1276                                 ping_set_errno (obj, errno);
1277                                 ret = -1;
1278                                 break;
1279                         }
1280
1281                         if (obj->device != NULL)
1282                                 free (obj->device);
1283                         obj->device = device;
1284 #else /* ! SO_BINDTODEVICE */
1285                         ping_set_errno (obj, ENOTSUP);
1286                         ret = -1;
1287 #endif /* ! SO_BINDTODEVICE */
1288                 } /* case PING_OPT_DEVICE */
1289                 break;
1290
1291                 default:
1292                         ret = -2;
1293         } /* switch (option) */
1294
1295         return (ret);
1296 } /* int ping_setopt */
1297
1298
1299 int ping_send (pingobj_t *obj)
1300 {
1301         int ret;
1302
1303         if (obj == NULL)
1304                 return (-1);
1305
1306         if (ping_send_all (obj) < 0)
1307                 return (-1);
1308
1309         if ((ret = ping_receive_all (obj)) < 0)
1310                 return (-2);
1311
1312         return (ret);
1313 }
1314
1315 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1316 {
1317         while (ph != NULL)
1318         {
1319                 if (strcasecmp (ph->username, host) == 0)
1320                         break;
1321
1322                 ph = ph->next;
1323         }
1324
1325         return (ph);
1326 }
1327
1328 int ping_host_add (pingobj_t *obj, const char *host)
1329 {
1330         pinghost_t *ph;
1331
1332         struct addrinfo  ai_hints;
1333         struct addrinfo *ai_list, *ai_ptr;
1334         int              ai_return;
1335
1336         if ((obj == NULL) || (host == NULL))
1337                 return (-1);
1338
1339         dprintf ("host = %s\n", host);
1340
1341         if (ping_host_search (obj->head, host) != NULL)
1342                 return (0);
1343
1344         memset (&ai_hints, '\0', sizeof (ai_hints));
1345         ai_hints.ai_flags     = 0;
1346 #ifdef AI_ADDRCONFIG
1347         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1348 #endif
1349 #ifdef AI_CANONNAME
1350         ai_hints.ai_flags    |= AI_CANONNAME;
1351 #endif
1352         ai_hints.ai_family    = obj->addrfamily;
1353         ai_hints.ai_socktype  = SOCK_RAW;
1354
1355         if ((ph = ping_alloc ()) == NULL)
1356         {
1357                 dprintf ("Out of memory!\n");
1358                 return (-1);
1359         }
1360
1361         if ((ph->username = strdup (host)) == NULL)
1362         {
1363                 dprintf ("Out of memory!\n");
1364                 ping_set_errno (obj, errno);
1365                 ping_free (ph);
1366                 return (-1);
1367         }
1368
1369         if ((ph->hostname = strdup (host)) == NULL)
1370         {
1371                 dprintf ("Out of memory!\n");
1372                 ping_set_errno (obj, errno);
1373                 ping_free (ph);
1374                 return (-1);
1375         }
1376
1377         /* obj->data is not garuanteed to be != NULL */
1378         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1379         {
1380                 dprintf ("Out of memory!\n");
1381                 ping_set_errno (obj, errno);
1382                 ping_free (ph);
1383                 return (-1);
1384         }
1385
1386         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1387         {
1388 #if defined(EAI_SYSTEM)
1389                 char errbuf[PING_ERRMSG_LEN];
1390 #endif
1391                 dprintf ("getaddrinfo failed\n");
1392                 ping_set_error (obj, "getaddrinfo",
1393 #if defined(EAI_SYSTEM)
1394                                                 (ai_return == EAI_SYSTEM)
1395                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1396 #endif
1397                                 gai_strerror (ai_return));
1398                 ping_free (ph);
1399                 return (-1);
1400         }
1401
1402         if (ai_list == NULL)
1403                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1404
1405         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1406         {
1407                 ph->fd = -1;
1408
1409                 if (ai_ptr->ai_family == AF_INET)
1410                 {
1411                         ai_ptr->ai_socktype = SOCK_RAW;
1412                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1413                 }
1414                 else if (ai_ptr->ai_family == AF_INET6)
1415                 {
1416                         ai_ptr->ai_socktype = SOCK_RAW;
1417                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1418                 }
1419                 else
1420                 {
1421                         char errmsg[PING_ERRMSG_LEN];
1422
1423                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1424                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1425
1426                         dprintf (errmsg);
1427                         ping_set_error (obj, "getaddrinfo", errmsg);
1428                         continue;
1429                 }
1430
1431                 /* TODO: Move this to a static function `ping_open_socket' and
1432                  * call it whenever the socket dies. */
1433                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1434                 if (ph->fd == -1)
1435                 {
1436 #if WITH_DEBUG
1437                         char errbuf[PING_ERRMSG_LEN];
1438                         dprintf ("socket: %s\n",
1439                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1440 #endif
1441                         ping_set_errno (obj, errno);
1442                         continue;
1443                 }
1444
1445                 if (obj->srcaddr != NULL)
1446                 {
1447                         assert (obj->srcaddrlen > 0);
1448                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1449
1450                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1451                         {
1452 #if WITH_DEBUG
1453                                 char errbuf[PING_ERRMSG_LEN];
1454                                 dprintf ("bind: %s\n",
1455                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1456 #endif
1457                                 ping_set_errno (obj, errno);
1458                                 close (ph->fd);
1459                                 ph->fd = -1;
1460                                 continue;
1461                         }
1462                 }
1463
1464 #ifdef SO_BINDTODEVICE
1465                 if (obj->device != NULL)
1466                 {
1467                         if (setsockopt (ph->fd, SOL_SOCKET, SO_BINDTODEVICE,
1468                                         obj->device, strlen (obj->device) + 1) != 0)
1469                         {
1470 #if WITH_DEBUG
1471                                 char errbuf[PING_ERRMSG_LEN];
1472                                 dprintf ("setsockopt: %s\n",
1473                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1474 #endif
1475                                 ping_set_errno (obj, errno);
1476                                 close (ph->fd);
1477                                 ph->fd = -1;
1478                                 continue;
1479                         }
1480                 }
1481 #endif /* SO_BINDTODEVICE */
1482
1483                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1484                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1485                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1486                 ph->addrlen = ai_ptr->ai_addrlen;
1487                 ph->addrfamily = ai_ptr->ai_family;
1488
1489 #ifdef AI_CANONNAME
1490                 if ((ai_ptr->ai_canonname != NULL)
1491                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1492                 {
1493                         char *old_hostname;
1494
1495                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1496                                         ph->hostname, ai_ptr->ai_canonname);
1497
1498                         old_hostname = ph->hostname;
1499                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1500                         {
1501                                 /* strdup failed, falling back to old hostname */
1502                                 ph->hostname = old_hostname;
1503                         }
1504                         else if (old_hostname != NULL)
1505                         {
1506                                 free (old_hostname);
1507                         }
1508                 }
1509 #endif /* AI_CANONNAME */
1510
1511                 if (ph->addrfamily == AF_INET)
1512                 {
1513                         int opt;
1514
1515                         /* Enable receiving the TOS field */
1516                         opt = 1;
1517                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTOS,
1518                                         &opt, sizeof (opt));
1519
1520                         /* Enable receiving the TTL field */
1521                         opt = 1;
1522                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1523                                         &opt, sizeof (opt));
1524                 }
1525 #if defined(IPV6_RECVHOPLIMIT) || defined(IPV6_RECVTCLASS)
1526                 else if (ph->addrfamily == AF_INET6)
1527                 {
1528                         int opt;
1529
1530 # if defined(IPV6_RECVHOPLIMIT)
1531                         /* For details see RFC 3542, section 6.3. */
1532                         opt = 1;
1533                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1534                                         &opt, sizeof (opt));
1535 # endif /* IPV6_RECVHOPLIMIT */
1536
1537 # if defined(IPV6_RECVTCLASS)
1538                         /* For details see RFC 3542, section 6.5. */
1539                         opt = 1;
1540                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVTCLASS,
1541                                         &opt, sizeof (opt));
1542 # endif /* IPV6_RECVTCLASS */
1543                 }
1544 #endif /* IPV6_RECVHOPLIMIT || IPV6_RECVTCLASS */
1545
1546                 break;
1547         } /* for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next) */
1548
1549         freeaddrinfo (ai_list);
1550
1551         if (ph->fd < 0)
1552         {
1553                 ping_free (ph);
1554                 return (-1);
1555         }
1556
1557         /*
1558          * Adding in the front is much easier, but then the iterator will
1559          * return the host that was added last as first host. That's just not
1560          * nice. -octo
1561          */
1562         if (obj->head == NULL)
1563         {
1564                 obj->head = ph;
1565         }
1566         else
1567         {
1568                 pinghost_t *hptr;
1569
1570                 hptr = obj->head;
1571                 while (hptr->next != NULL)
1572                         hptr = hptr->next;
1573
1574                 assert ((hptr != NULL) && (hptr->next == NULL));
1575                 hptr->next = ph;
1576         }
1577
1578         ping_set_ttl (ph, obj->ttl);
1579         ping_set_tos (obj, ph, obj->tos);
1580
1581         return (0);
1582 } /* int ping_host_add */
1583
1584 int ping_host_remove (pingobj_t *obj, const char *host)
1585 {
1586         pinghost_t *pre, *cur;
1587
1588         if ((obj == NULL) || (host == NULL))
1589                 return (-1);
1590
1591         pre = NULL;
1592         cur = obj->head;
1593
1594         while (cur != NULL)
1595         {
1596                 if (strcasecmp (host, cur->username) == 0)
1597                         break;
1598
1599                 pre = cur;
1600                 cur = cur->next;
1601         }
1602
1603         if (cur == NULL)
1604         {
1605                 ping_set_error (obj, "ping_host_remove", "Host not found");
1606                 return (-1);
1607         }
1608
1609         if (pre == NULL)
1610                 obj->head = cur->next;
1611         else
1612                 pre->next = cur->next;
1613
1614         ping_free (cur);
1615
1616         return (0);
1617 }
1618
1619 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1620 {
1621         if (obj == NULL)
1622                 return (NULL);
1623         return ((pingobj_iter_t *) obj->head);
1624 }
1625
1626 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1627 {
1628         if (iter == NULL)
1629                 return (NULL);
1630         return ((pingobj_iter_t *) iter->next);
1631 }
1632
1633 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1634                 void *buffer, size_t *buffer_len)
1635 {
1636         int ret = EINVAL;
1637
1638         size_t orig_buffer_len = *buffer_len;
1639
1640         if ((iter == NULL) || (buffer_len == NULL))
1641                 return (-1);
1642
1643         if ((buffer == NULL) && (*buffer_len != 0 ))
1644                 return (-1);
1645
1646         switch (info)
1647         {
1648                 case PING_INFO_USERNAME:
1649                         ret = ENOMEM;
1650                         *buffer_len = strlen (iter->username) + 1;
1651                         if (orig_buffer_len <= *buffer_len)
1652                                 break;
1653                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1654                          * will copy `*buffer_len' and pad the rest of
1655                          * `buffer' with null-bytes */
1656                         strncpy (buffer, iter->username, orig_buffer_len);
1657                         ret = 0;
1658                         break;
1659
1660                 case PING_INFO_HOSTNAME:
1661                         ret = ENOMEM;
1662                         *buffer_len = strlen (iter->hostname) + 1;
1663                         if (orig_buffer_len < *buffer_len)
1664                                 break;
1665                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1666                          * will copy `*buffer_len' and pad the rest of
1667                          * `buffer' with null-bytes */
1668                         strncpy (buffer, iter->hostname, orig_buffer_len);
1669                         ret = 0;
1670                         break;
1671
1672                 case PING_INFO_ADDRESS:
1673                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1674                                         iter->addrlen,
1675                                         (char *) buffer,
1676                                         *buffer_len,
1677                                         NULL, 0,
1678                                         NI_NUMERICHOST);
1679                         if (ret != 0)
1680                         {
1681                                 if ((ret == EAI_MEMORY)
1682 #ifdef EAI_OVERFLOW
1683                                                 || (ret == EAI_OVERFLOW)
1684 #endif
1685                                    )
1686                                         ret = ENOMEM;
1687 #if defined(EAI_SYSTEM)
1688                                 else if (ret == EAI_SYSTEM)
1689                                         ret = errno;
1690 #endif
1691                                 else
1692                                         ret = EINVAL;
1693                         }
1694                         break;
1695
1696                 case PING_INFO_FAMILY:
1697                         ret = ENOMEM;
1698                         *buffer_len = sizeof (int);
1699                         if (orig_buffer_len < sizeof (int))
1700                                 break;
1701                         *((int *) buffer) = iter->addrfamily;
1702                         ret = 0;
1703                         break;
1704
1705                 case PING_INFO_LATENCY:
1706                         ret = ENOMEM;
1707                         *buffer_len = sizeof (double);
1708                         if (orig_buffer_len < sizeof (double))
1709                                 break;
1710                         *((double *) buffer) = iter->latency;
1711                         ret = 0;
1712                         break;
1713
1714                 case PING_INFO_DROPPED:
1715                         ret = ENOMEM;
1716                         *buffer_len = sizeof (uint32_t);
1717                         if (orig_buffer_len < sizeof (uint32_t))
1718                                 break;
1719                         *((uint32_t *) buffer) = iter->dropped;
1720                         ret = 0;
1721                         break;
1722
1723                 case PING_INFO_SEQUENCE:
1724                         ret = ENOMEM;
1725                         *buffer_len = sizeof (unsigned int);
1726                         if (orig_buffer_len < sizeof (unsigned int))
1727                                 break;
1728                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1729                         ret = 0;
1730                         break;
1731
1732                 case PING_INFO_IDENT:
1733                         ret = ENOMEM;
1734                         *buffer_len = sizeof (uint16_t);
1735                         if (orig_buffer_len < sizeof (uint16_t))
1736                                 break;
1737                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1738                         ret = 0;
1739                         break;
1740
1741                 case PING_INFO_DATA:
1742                         ret = ENOMEM;
1743                         *buffer_len = strlen (iter->data);
1744                         if (orig_buffer_len < *buffer_len)
1745                                 break;
1746                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1747                         ret = 0;
1748                         break;
1749
1750                 case PING_INFO_RECV_TTL:
1751                         ret = ENOMEM;
1752                         *buffer_len = sizeof (int);
1753                         if (orig_buffer_len < sizeof (int))
1754                                 break;
1755                         *((int *) buffer) = iter->recv_ttl;
1756                         ret = 0;
1757                         break;
1758
1759                 case PING_INFO_RECV_TOS:
1760                         ret = ENOMEM;
1761                         if (*buffer_len>sizeof(unsigned)) *buffer_len=sizeof(unsigned);
1762                         if (!*buffer_len) *buffer_len=1;
1763                         if (orig_buffer_len < *buffer_len)
1764                                 break;
1765                         memcpy(buffer,&iter->recv_tos,*buffer_len);
1766                         ret = 0;
1767                         break;
1768         }
1769
1770         return (ret);
1771 } /* ping_iterator_get_info */
1772
1773 void *ping_iterator_get_context (pingobj_iter_t *iter)
1774 {
1775         if (iter == NULL)
1776                 return (NULL);
1777         return (iter->context);
1778 }
1779
1780 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1781 {
1782         if (iter == NULL)
1783                 return;
1784         iter->context = context;
1785 }