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         unsigned                 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         unsigned                 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 = ip_hdr->ip_ttl;
 357                 ptr->recv_tos = 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         unsigned 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 = 0xffff;
 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 = %u;\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_RECVTCLASS)
 536                         {
 537                                 memcpy (&recv_tos, CMSG_DATA (cmsg),
 538                                                 sizeof (recv_tos));
 539                                 dprintf ("TOSv6 = %u;\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 static int ping_set_tos (pinghost_t *ph, unsigned tos)
 957 {
 958         int ret = -2;
 959
 960         if (ph->addrfamily == AF_INET)
 961         {
 962                 dprintf ("Setting TP_TOS to %i\n", ttl);
 963                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TOS,
 964                                 &tos, sizeof (tos));
 965         }
 966         else if (ph->addrfamily == AF_INET6)
 967         {
 968                 dprintf ("Setting IPV6_TCLASS to %i\n", ttl);
 969                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_TCLASS,
 970                                 &tos, sizeof (tos));
 971         }
 972
 973         return (ret);
 974 }
 975
 976 static int ping_get_ident (void)
 977 {
 978         int fd;
 979         static int did_seed = 0;
 980
 981         int retval;
 982
 983         if (did_seed == 0)
 984         {
 985                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 986                 {
 987                         unsigned int seed;
 988
 989                         if (read (fd, &seed, sizeof (seed)) != -1)
 990                         {
 991                                 did_seed = 1;
 992                                 dprintf ("Random seed:   %#x\n", seed);
 993                                 srandom (seed);
 994                         }
 995
 996                         close (fd);
 997                 }
 998 #if WITH_DEBUG
 999                 else
1000                 {
1001                         char errbuf[PING_ERRMSG_LEN];
1002                         dprintf ("open (/dev/urandom): %s\n",
1003                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1004                 }
1005 #endif
1006         }
1007
1008         retval = (int) random ();
1009
1010         dprintf ("Random number: %#x\n", retval);
1011
1012         return (retval);
1013 }
1014
1015 static pinghost_t *ping_alloc (void)
1016 {
1017         pinghost_t *ph;
1018         size_t      ph_size;
1019
1020         ph_size = sizeof (pinghost_t)
1021                 + sizeof (struct sockaddr_storage)
1022                 + sizeof (struct timeval);
1023
1024         ph = (pinghost_t *) malloc (ph_size);
1025         if (ph == NULL)
1026                 return (NULL);
1027
1028         memset (ph, '\0', ph_size);
1029
1030         ph->timer   = (struct timeval *) (ph + 1);
1031         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
1032
1033         ph->addrlen = sizeof (struct sockaddr_storage);
1034         ph->fd      = -1;
1035         ph->latency = -1.0;
1036         ph->dropped = 0;
1037         ph->ident   = ping_get_ident () & 0xFFFF;
1038
1039         return (ph);
1040 }
1041
1042 static void ping_free (pinghost_t *ph)
1043 {
1044         if (ph->fd >= 0)
1045                 close (ph->fd);
1046
1047         if (ph->username != NULL)
1048                 free (ph->username);
1049
1050         if (ph->hostname != NULL)
1051                 free (ph->hostname);
1052
1053         if (ph->data != NULL)
1054                 free (ph->data);
1055
1056         free (ph);
1057 }
1058
1059 /*
1060  * public methods
1061  */
1062 const char *ping_get_error (pingobj_t *obj)
1063 {
1064         if (obj == NULL)
1065                 return (NULL);
1066         return (obj->errmsg);
1067 }
1068
1069 pingobj_t *ping_construct (void)
1070 {
1071         pingobj_t *obj;
1072
1073         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
1074                 return (NULL);
1075         memset (obj, '\0', sizeof (pingobj_t));
1076
1077         obj->timeout    = PING_DEF_TIMEOUT;
1078         obj->ttl        = PING_DEF_TTL;
1079         obj->addrfamily = PING_DEF_AF;
1080         obj->data       = strdup (PING_DEF_DATA);
1081         obj->tos        = 0;
1082
1083         return (obj);
1084 }
1085
1086 void ping_destroy (pingobj_t *obj)
1087 {
1088         pinghost_t *current;
1089         pinghost_t *next;
1090
1091         if (obj == NULL)
1092                 return;
1093
1094         current = obj->head;
1095         next = NULL;
1096
1097         while (current != NULL)
1098         {
1099                 next = current->next;
1100                 ping_free (current);
1101                 current = next;
1102         }
1103
1104         if (obj->data != NULL)
1105                 free (obj->data);
1106
1107         if (obj->srcaddr != NULL)
1108                 free (obj->srcaddr);
1109
1110         if (obj->device != NULL)
1111                 free (obj->device);
1112
1113         free (obj);
1114
1115         return;
1116 }
1117
1118 int ping_setopt (pingobj_t *obj, int option, void *value)
1119 {
1120         int ret = 0;
1121
1122         if ((obj == NULL) || (value == NULL))
1123                 return (-1);
1124
1125         switch (option)
1126         {
1127                 case PING_OPT_TOS:{
1128                         obj->tos=*(unsigned *)value;
1129                         pinghost_t *ph;
1130                         for (ph = obj->head; ph != NULL; ph = ph->next)
1131                                 ping_set_tos (ph, obj->tos);
1132                         break;
1133                 }
1134                 case PING_OPT_TIMEOUT:
1135                         obj->timeout = *((double *) value);
1136                         if (obj->timeout < 0.0)
1137                         {
1138                                 obj->timeout = PING_DEF_TIMEOUT;
1139                                 ret = -1;
1140                         }
1141                         break;
1142
1143                 case PING_OPT_TTL:
1144                         obj->ttl = *((int *) value);
1145                         if ((obj->ttl < 1) || (obj->ttl > 255))
1146                         {
1147                                 obj->ttl = PING_DEF_TTL;
1148                                 ret = -1;
1149                         }
1150                         else
1151                         {
1152                                 pinghost_t *ph;
1153
1154                                 for (ph = obj->head; ph != NULL; ph = ph->next)
1155                                         ping_set_ttl (ph, obj->ttl);
1156                         }
1157                         break;
1158
1159                 case PING_OPT_AF:
1160                         obj->addrfamily = *((int *) value);
1161                         if ((obj->addrfamily != AF_UNSPEC)
1162                                         && (obj->addrfamily != AF_INET)
1163                                         && (obj->addrfamily != AF_INET6))
1164                         {
1165                                 obj->addrfamily = PING_DEF_AF;
1166                                 ret = -1;
1167                         }
1168                         if (obj->srcaddr != NULL)
1169                         {
1170                                 free (obj->srcaddr);
1171                                 obj->srcaddr = NULL;
1172                         }
1173                         break;
1174
1175                 case PING_OPT_DATA:
1176                         if (obj->data != NULL)
1177                         {
1178                                 free (obj->data);
1179                                 obj->data = NULL;
1180                         }
1181                         obj->data = strdup ((const char *) value);
1182                         break;
1183
1184                 case PING_OPT_SOURCE:
1185                 {
1186                         char            *hostname = (char *) value;
1187                         struct addrinfo  ai_hints;
1188                         struct addrinfo *ai_list;
1189                         int              status;
1190 #if WITH_DEBUG
1191                         if (obj->addrfamily != AF_UNSPEC)
1192                         {
1193                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1194                         }
1195 #endif
1196                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1197                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1198 #if defined(AI_ADDRCONFIG)
1199                         ai_hints.ai_flags = AI_ADDRCONFIG;
1200 #endif
1201                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1202                         if (status != 0)
1203                         {
1204 #if defined(EAI_SYSTEM)
1205                                 char errbuf[PING_ERRMSG_LEN];
1206 #endif
1207                                 ping_set_error (obj, "getaddrinfo",
1208 #if defined(EAI_SYSTEM)
1209                                                 (status == EAI_SYSTEM)
1210                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1211 #endif
1212                                                 gai_strerror (status));
1213                                 ret = -1;
1214                                 break;
1215                         }
1216 #if WITH_DEBUG
1217                         if (ai_list->ai_next != NULL)
1218                         {
1219                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1220                         }
1221 #endif
1222                         if (obj->srcaddr == NULL)
1223                         {
1224                                 obj->srcaddrlen = 0;
1225                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1226                                 if (obj->srcaddr == NULL)
1227                                 {
1228                                         ping_set_errno (obj, errno);
1229                                         ret = -1;
1230                                         freeaddrinfo (ai_list);
1231                                         break;
1232                                 }
1233                         }
1234                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1235                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1236                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1237                                         ai_list->ai_addrlen);
1238                         obj->srcaddrlen = ai_list->ai_addrlen;
1239                         obj->addrfamily = ai_list->ai_family;
1240
1241                         freeaddrinfo (ai_list);
1242                 } /* case PING_OPT_SOURCE */
1243                 break;
1244
1245                 case PING_OPT_DEVICE:
1246                 {
1247 #ifdef SO_BINDTODEVICE
1248                         char *device = strdup ((char *) value);
1249
1250                         if (device == NULL)
1251                         {
1252                                 ping_set_errno (obj, errno);
1253                                 ret = -1;
1254                                 break;
1255                         }
1256
1257                         if (obj->device != NULL)
1258                                 free (obj->device);
1259                         obj->device = device;
1260 #else /* ! SO_BINDTODEVICE */
1261                         ping_set_errno (obj, ENOTSUP);
1262                         ret = -1;
1263 #endif /* ! SO_BINDTODEVICE */
1264                 } /* case PING_OPT_DEVICE */
1265                 break;
1266
1267                 default:
1268                         ret = -2;
1269         } /* switch (option) */
1270
1271         return (ret);
1272 } /* int ping_setopt */
1273
1274
1275 int ping_send (pingobj_t *obj)
1276 {
1277         int ret;
1278
1279         if (obj == NULL)
1280                 return (-1);
1281
1282         if (ping_send_all (obj) < 0)
1283                 return (-1);
1284
1285         if ((ret = ping_receive_all (obj)) < 0)
1286                 return (-2);
1287
1288         return (ret);
1289 }
1290
1291 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1292 {
1293         while (ph != NULL)
1294         {
1295                 if (strcasecmp (ph->username, host) == 0)
1296                         break;
1297
1298                 ph = ph->next;
1299         }
1300
1301         return (ph);
1302 }
1303
1304 int ping_host_add (pingobj_t *obj, const char *host)
1305 {
1306         pinghost_t *ph;
1307
1308         struct addrinfo  ai_hints;
1309         struct addrinfo *ai_list, *ai_ptr;
1310         int              ai_return;
1311
1312         if ((obj == NULL) || (host == NULL))
1313                 return (-1);
1314
1315         dprintf ("host = %s\n", host);
1316
1317         if (ping_host_search (obj->head, host) != NULL)
1318                 return (0);
1319
1320         memset (&ai_hints, '\0', sizeof (ai_hints));
1321         ai_hints.ai_flags     = 0;
1322 #ifdef AI_ADDRCONFIG
1323         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1324 #endif
1325 #ifdef AI_CANONNAME
1326         ai_hints.ai_flags    |= AI_CANONNAME;
1327 #endif
1328         ai_hints.ai_family    = obj->addrfamily;
1329         ai_hints.ai_socktype  = SOCK_RAW;
1330
1331         if ((ph = ping_alloc ()) == NULL)
1332         {
1333                 dprintf ("Out of memory!\n");
1334                 return (-1);
1335         }
1336
1337         if ((ph->username = strdup (host)) == NULL)
1338         {
1339                 dprintf ("Out of memory!\n");
1340                 ping_set_errno (obj, errno);
1341                 ping_free (ph);
1342                 return (-1);
1343         }
1344
1345         if ((ph->hostname = strdup (host)) == NULL)
1346         {
1347                 dprintf ("Out of memory!\n");
1348                 ping_set_errno (obj, errno);
1349                 ping_free (ph);
1350                 return (-1);
1351         }
1352
1353         /* obj->data is not garuanteed to be != NULL */
1354         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1355         {
1356                 dprintf ("Out of memory!\n");
1357                 ping_set_errno (obj, errno);
1358                 ping_free (ph);
1359                 return (-1);
1360         }
1361
1362         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1363         {
1364 #if defined(EAI_SYSTEM)
1365                 char errbuf[PING_ERRMSG_LEN];
1366 #endif
1367                 dprintf ("getaddrinfo failed\n");
1368                 ping_set_error (obj, "getaddrinfo",
1369 #if defined(EAI_SYSTEM)
1370                                                 (ai_return == EAI_SYSTEM)
1371                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1372 #endif
1373                                 gai_strerror (ai_return));
1374                 ping_free (ph);
1375                 return (-1);
1376         }
1377
1378         if (ai_list == NULL)
1379                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1380
1381         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1382         {
1383                 ph->fd = -1;
1384
1385                 if (ai_ptr->ai_family == AF_INET)
1386                 {
1387                         ai_ptr->ai_socktype = SOCK_RAW;
1388                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1389                 }
1390                 else if (ai_ptr->ai_family == AF_INET6)
1391                 {
1392                         ai_ptr->ai_socktype = SOCK_RAW;
1393                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1394                 }
1395                 else
1396                 {
1397                         char errmsg[PING_ERRMSG_LEN];
1398
1399                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1400                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1401
1402                         dprintf (errmsg);
1403                         ping_set_error (obj, "getaddrinfo", errmsg);
1404                         continue;
1405                 }
1406
1407                 /* TODO: Move this to a static function `ping_open_socket' and
1408                  * call it whenever the socket dies. */
1409                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1410                 if (ph->fd == -1)
1411                 {
1412 #if WITH_DEBUG
1413                         char errbuf[PING_ERRMSG_LEN];
1414                         dprintf ("socket: %s\n",
1415                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1416 #endif
1417                         ping_set_errno (obj, errno);
1418                         continue;
1419                 }
1420
1421                 if (obj->srcaddr != NULL)
1422                 {
1423                         assert (obj->srcaddrlen > 0);
1424                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1425
1426                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1427                         {
1428 #if WITH_DEBUG
1429                                 char errbuf[PING_ERRMSG_LEN];
1430                                 dprintf ("bind: %s\n",
1431                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1432 #endif
1433                                 ping_set_errno (obj, errno);
1434                                 close (ph->fd);
1435                                 ph->fd = -1;
1436                                 continue;
1437                         }
1438                 }
1439
1440 #ifdef SO_BINDTODEVICE
1441                 if (obj->device != NULL)
1442                 {
1443                         if (setsockopt (ph->fd, SOL_SOCKET, SO_BINDTODEVICE,
1444                                         obj->device, strlen (obj->device) + 1) != 0)
1445                         {
1446 #if WITH_DEBUG
1447                                 char errbuf[PING_ERRMSG_LEN];
1448                                 dprintf ("setsockopt: %s\n",
1449                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1450 #endif
1451                                 ping_set_errno (obj, errno);
1452                                 close (ph->fd);
1453                                 ph->fd = -1;
1454                                 continue;
1455                         }
1456                 }
1457 #endif /* SO_BINDTODEVICE */
1458
1459                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1460                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1461                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1462                 ph->addrlen = ai_ptr->ai_addrlen;
1463                 ph->addrfamily = ai_ptr->ai_family;
1464
1465 #ifdef AI_CANONNAME
1466                 if ((ai_ptr->ai_canonname != NULL)
1467                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1468                 {
1469                         char *old_hostname;
1470
1471                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1472                                         ph->hostname, ai_ptr->ai_canonname);
1473
1474                         old_hostname = ph->hostname;
1475                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1476                         {
1477                                 /* strdup failed, falling back to old hostname */
1478                                 ph->hostname = old_hostname;
1479                         }
1480                         else if (old_hostname != NULL)
1481                         {
1482                                 free (old_hostname);
1483                         }
1484                 }
1485 #endif /* AI_CANONNAME */
1486
1487                 if (ph->addrfamily == AF_INET)
1488                 {
1489                         int opt = 1;
1490
1491                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1492                                         &opt, sizeof (opt));
1493                 }
1494 #if defined(IPPROTO_IPV6) && defined(IPV6_RECVHOPLIMIT)
1495                 else if (ph->addrfamily == AF_INET6)
1496                 {
1497                         int opt = 1;
1498
1499                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1500                                         &opt, sizeof (opt));
1501                 }
1502 #endif
1503
1504                 break;
1505         }
1506
1507         freeaddrinfo (ai_list);
1508
1509         if (ph->fd < 0)
1510         {
1511                 ping_free (ph);
1512                 return (-1);
1513         }
1514
1515         /*
1516          * Adding in the front is much easier, but then the iterator will
1517          * return the host that was added last as first host. That's just not
1518          * nice. -octo
1519          */
1520         if (obj->head == NULL)
1521         {
1522                 obj->head = ph;
1523         }
1524         else
1525         {
1526                 pinghost_t *hptr;
1527
1528                 hptr = obj->head;
1529                 while (hptr->next != NULL)
1530                         hptr = hptr->next;
1531
1532                 assert ((hptr != NULL) && (hptr->next == NULL));
1533                 hptr->next = ph;
1534         }
1535
1536         ping_set_ttl (ph, obj->ttl);
1537         ping_set_tos (ph, obj->tos);
1538
1539         return (0);
1540 } /* int ping_host_add */
1541
1542 int ping_host_remove (pingobj_t *obj, const char *host)
1543 {
1544         pinghost_t *pre, *cur;
1545
1546         if ((obj == NULL) || (host == NULL))
1547                 return (-1);
1548
1549         pre = NULL;
1550         cur = obj->head;
1551
1552         while (cur != NULL)
1553         {
1554                 if (strcasecmp (host, cur->username) == 0)
1555                         break;
1556
1557                 pre = cur;
1558                 cur = cur->next;
1559         }
1560
1561         if (cur == NULL)
1562         {
1563                 ping_set_error (obj, "ping_host_remove", "Host not found");
1564                 return (-1);
1565         }
1566
1567         if (pre == NULL)
1568                 obj->head = cur->next;
1569         else
1570                 pre->next = cur->next;
1571
1572         ping_free (cur);
1573
1574         return (0);
1575 }
1576
1577 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1578 {
1579         if (obj == NULL)
1580                 return (NULL);
1581         return ((pingobj_iter_t *) obj->head);
1582 }
1583
1584 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1585 {
1586         if (iter == NULL)
1587                 return (NULL);
1588         return ((pingobj_iter_t *) iter->next);
1589 }
1590
1591 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1592                 void *buffer, size_t *buffer_len)
1593 {
1594         int ret = EINVAL;
1595
1596         size_t orig_buffer_len = *buffer_len;
1597
1598         if ((iter == NULL) || (buffer_len == NULL))
1599                 return (-1);
1600
1601         if ((buffer == NULL) && (*buffer_len != 0 ))
1602                 return (-1);
1603
1604         switch (info)
1605         {
1606                 case PING_INFO_USERNAME:
1607                         ret = ENOMEM;
1608                         *buffer_len = strlen (iter->username) + 1;
1609                         if (orig_buffer_len <= *buffer_len)
1610                                 break;
1611                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1612                          * will copy `*buffer_len' and pad the rest of
1613                          * `buffer' with null-bytes */
1614                         strncpy (buffer, iter->username, orig_buffer_len);
1615                         ret = 0;
1616                         break;
1617
1618                 case PING_INFO_HOSTNAME:
1619                         ret = ENOMEM;
1620                         *buffer_len = strlen (iter->hostname) + 1;
1621                         if (orig_buffer_len < *buffer_len)
1622                                 break;
1623                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1624                          * will copy `*buffer_len' and pad the rest of
1625                          * `buffer' with null-bytes */
1626                         strncpy (buffer, iter->hostname, orig_buffer_len);
1627                         ret = 0;
1628                         break;
1629
1630                 case PING_INFO_ADDRESS:
1631                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1632                                         iter->addrlen,
1633                                         (char *) buffer,
1634                                         *buffer_len,
1635                                         NULL, 0,
1636                                         NI_NUMERICHOST);
1637                         if (ret != 0)
1638                         {
1639                                 if ((ret == EAI_MEMORY)
1640 #ifdef EAI_OVERFLOW
1641                                                 || (ret == EAI_OVERFLOW)
1642 #endif
1643                                    )
1644                                         ret = ENOMEM;
1645 #if defined(EAI_SYSTEM)
1646                                 else if (ret == EAI_SYSTEM)
1647                                         ret = errno;
1648 #endif
1649                                 else
1650                                         ret = EINVAL;
1651                         }
1652                         break;
1653
1654                 case PING_INFO_FAMILY:
1655                         ret = ENOMEM;
1656                         *buffer_len = sizeof (int);
1657                         if (orig_buffer_len < sizeof (int))
1658                                 break;
1659                         *((int *) buffer) = iter->addrfamily;
1660                         ret = 0;
1661                         break;
1662
1663                 case PING_INFO_LATENCY:
1664                         ret = ENOMEM;
1665                         *buffer_len = sizeof (double);
1666                         if (orig_buffer_len < sizeof (double))
1667                                 break;
1668                         *((double *) buffer) = iter->latency;
1669                         ret = 0;
1670                         break;
1671
1672                 case PING_INFO_DROPPED:
1673                         ret = ENOMEM;
1674                         *buffer_len = sizeof (uint32_t);
1675                         if (orig_buffer_len < sizeof (uint32_t))
1676                                 break;
1677                         *((uint32_t *) buffer) = iter->dropped;
1678                         ret = 0;
1679                         break;
1680
1681                 case PING_INFO_SEQUENCE:
1682                         ret = ENOMEM;
1683                         *buffer_len = sizeof (unsigned int);
1684                         if (orig_buffer_len < sizeof (unsigned int))
1685                                 break;
1686                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1687                         ret = 0;
1688                         break;
1689
1690                 case PING_INFO_IDENT:
1691                         ret = ENOMEM;
1692                         *buffer_len = sizeof (uint16_t);
1693                         if (orig_buffer_len < sizeof (uint16_t))
1694                                 break;
1695                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1696                         ret = 0;
1697                         break;
1698
1699                 case PING_INFO_DATA:
1700                         ret = ENOMEM;
1701                         *buffer_len = strlen (iter->data);
1702                         if (orig_buffer_len < *buffer_len)
1703                                 break;
1704                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1705                         ret = 0;
1706                         break;
1707
1708                 case PING_INFO_RECV_TTL:
1709                         ret = ENOMEM;
1710                         *buffer_len = sizeof (int);
1711                         if (orig_buffer_len < sizeof (int))
1712                                 break;
1713                         *((int *) buffer) = iter->recv_ttl;
1714                         ret = 0;
1715                         break;
1716
1717                 case PING_INFO_TOS:
1718                         ret = ENOMEM;
1719                         if (*buffer_len>sizeof(unsigned)) *buffer_len=sizeof(unsigned);
1720                         if (!*buffer_len) *buffer_len=1;
1721                         if (orig_buffer_len < *buffer_len)
1722                                 break;
1723                         memcpy(buffer,&iter->recv_tos,*buffer_len);
1724                         ret = 0;
1725                         break;
1726         }
1727
1728         return (ret);
1729 } /* ping_iterator_get_info */
1730
1731 void *ping_iterator_get_context (pingobj_iter_t *iter)
1732 {
1733         if (iter == NULL)
1734                 return (NULL);
1735         return (iter->context);
1736 }
1737
1738 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1739 {
1740         if (iter == NULL)
1741                 return;
1742         iter->context = context;
1743 }