src/liboping.c

   1 /**
   2  * Object oriented C module to send ICMP and ICMPv6 `echo's.
   3  * Copyright (C) 2006-2009  Florian octo Forster <octo at verplant.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; only version 2 of the License is
   8  * applicable.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  18  */
  19
  20 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #if STDC_HEADERS
  25 # include <stdlib.h>
  26 # include <stdio.h>
  27 # include <string.h>
  28 # include <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         char                    *data;
 121
 122         void                    *context;
 123
 124         struct pinghost         *next;
 125 };
 126
 127 struct pingobj
 128 {
 129         double                   timeout;
 130         int                      ttl;
 131         int                      addrfamily;
 132         char                    *data;
 133
 134         struct sockaddr         *srcaddr;
 135         socklen_t                srcaddrlen;
 136
 137         char                    *device;
 138
 139         char                     errmsg[PING_ERRMSG_LEN];
 140
 141         pinghost_t              *head;
 142 };
 143
 144 /*
 145  * private (static) functions
 146  */
 147 /* Even though Posix requires "strerror_r" to return an "int",
 148  * some systems (e.g. the GNU libc) return a "char *" _and_
 149  * ignore the second argument ... -tokkee */
 150 static char *sstrerror (int errnum, char *buf, size_t buflen)
 151 {
 152         buf[0] = 0;
 153
 154 #if !HAVE_STRERROR_R
 155         {
 156                 snprintf (buf, buflen, "Error %i (%#x)", errnum, errnum);
 157         }
 158 /* #endif !HAVE_STRERROR_R */
 159
 160 #elif STRERROR_R_CHAR_P
 161         {
 162                 char *temp;
 163                 temp = strerror_r (errnum, buf, buflen);
 164                 if (buf[0] == 0)
 165                 {
 166                         if ((temp != NULL) && (temp != buf) && (temp[0] != 0))
 167                                 strncpy (buf, temp, buflen);
 168                         else
 169                                 strncpy (buf, "strerror_r did not return "
 170                                                 "an error message", buflen);
 171                 }
 172         }
 173 /* #endif STRERROR_R_CHAR_P */
 174
 175 #else
 176         if (strerror_r (errnum, buf, buflen) != 0)
 177         {
 178                 snprintf (buf, buflen, "Error %i (%#x); "
 179                                 "Additionally, strerror_r failed.",
 180                                 errnum, errnum);
 181         }
 182 #endif /* STRERROR_R_CHAR_P */
 183
 184         buf[buflen - 1] = 0;
 185
 186         return (buf);
 187 } /* char *sstrerror */
 188
 189 static void ping_set_error (pingobj_t *obj, const char *function,
 190                 const char *message)
 191 {
 192         snprintf (obj->errmsg, sizeof (obj->errmsg),
 193                         "%s: %s", function, message);
 194         obj->errmsg[sizeof (obj->errmsg) - 1] = 0;
 195 }
 196
 197 static void ping_set_errno (pingobj_t *obj, int error_number)
 198 {
 199         sstrerror (error_number, obj->errmsg, sizeof (obj->errmsg));
 200 }
 201
 202 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
 203                 struct timeval *res)
 204 {
 205         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
 206         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
 207
 208         while (res->tv_usec > 1000000)
 209         {
 210                 res->tv_usec -= 1000000;
 211                 res->tv_sec++;
 212         }
 213
 214         return (0);
 215 }
 216
 217 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
 218                 struct timeval *res)
 219 {
 220         if ((tv1->tv_sec < tv2->tv_sec)
 221                         || ((tv1->tv_sec == tv2->tv_sec)
 222                                 && (tv1->tv_usec < tv2->tv_usec)))
 223                 return (-1);
 224
 225         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
 226         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
 227
 228         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec >= 0)));
 229
 230         while (res->tv_usec < 0)
 231         {
 232                 res->tv_usec += 1000000;
 233                 res->tv_sec--;
 234         }
 235
 236         return (0);
 237 }
 238
 239 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
 240 {
 241         uint32_t sum = 0;
 242         uint16_t ret = 0;
 243
 244         uint16_t *ptr;
 245
 246         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
 247                 sum += *ptr;
 248
 249         if (len == 1)
 250         {
 251                 *(char *) &ret = *(char *) ptr;
 252                 sum += ret;
 253         }
 254
 255         /* Do this twice to get all possible carries.. */
 256         sum = (sum >> 16) + (sum & 0xFFFF);
 257         sum = (sum >> 16) + (sum & 0xFFFF);
 258
 259         ret = ~sum;
 260
 261         return (ret);
 262 }
 263
 264 static pinghost_t *ping_receive_ipv4 (pingobj_t *obj, char *buffer,
 265                 size_t buffer_len)
 266 {
 267         struct ip *ip_hdr;
 268         struct icmp *icmp_hdr;
 269
 270         size_t ip_hdr_len;
 271
 272         uint16_t recv_checksum;
 273         uint16_t calc_checksum;
 274
 275         uint16_t ident;
 276         uint16_t seq;
 277
 278         pinghost_t *ptr;
 279
 280         if (buffer_len < sizeof (struct ip))
 281                 return (NULL);
 282
 283         ip_hdr     = (struct ip *) buffer;
 284         ip_hdr_len = ip_hdr->ip_hl << 2;
 285
 286         if (buffer_len < ip_hdr_len)
 287                 return (NULL);
 288
 289         buffer     += ip_hdr_len;
 290         buffer_len -= ip_hdr_len;
 291
 292         if (buffer_len < sizeof (struct icmp))
 293                 return (NULL);
 294
 295         icmp_hdr = (struct icmp *) buffer;
 296         buffer     += sizeof (struct icmp);
 297         buffer_len -= sizeof (struct icmp);
 298
 299         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
 300         {
 301                 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
 302                 return (NULL);
 303         }
 304
 305         recv_checksum = icmp_hdr->icmp_cksum;
 306         icmp_hdr->icmp_cksum = 0;
 307         calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
 308                         sizeof (struct icmp) + buffer_len);
 309
 310         if (recv_checksum != calc_checksum)
 311         {
 312                 dprintf ("Checksum missmatch: Got 0x%04"PRIx16", "
 313                                 "calculated 0x%04"PRIx16"\n",
 314                                 recv_checksum, calc_checksum);
 315                 return (NULL);
 316         }
 317
 318         ident = ntohs (icmp_hdr->icmp_id);
 319         seq   = ntohs (icmp_hdr->icmp_seq);
 320
 321         /* We have to iterate over all hosts, since ICMPv4 packets may
 322          * be received on any raw v4 socket. */
 323         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 324         {
 325                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 326                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 327
 328                 if (ptr->addrfamily != AF_INET)
 329                         continue;
 330
 331                 if (!timerisset (ptr->timer))
 332                         continue;
 333
 334                 if (ptr->ident != ident)
 335                         continue;
 336
 337                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 338                         continue;
 339
 340                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
 341                                 "seq = %"PRIu16"\n",
 342                                 ptr->hostname, ident, seq);
 343
 344                 break;
 345         }
 346
 347         if (ptr == NULL)
 348         {
 349                 dprintf ("No match found for ident = 0x%04"PRIx16", seq = %"PRIu16"\n",
 350                                 ident, seq);
 351         }
 352
 353         if (ptr != NULL)
 354                 ptr->recv_ttl = ip_hdr->ip_ttl;
 355
 356         return (ptr);
 357 }
 358
 359 #ifndef ICMP6_ECHO_REQUEST
 360 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
 361 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
 362 # else
 363 #  define ICMP6_ECHO_REQUEST 128
 364 # endif
 365 #endif
 366
 367 #ifndef ICMP6_ECHO_REPLY
 368 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
 369 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
 370 # else
 371 #  define ICMP6_ECHO_REPLY 129
 372 # endif
 373 #endif
 374
 375 static pinghost_t *ping_receive_ipv6 (pingobj_t *obj, char *buffer,
 376                 size_t buffer_len)
 377 {
 378         struct icmp6_hdr *icmp_hdr;
 379
 380         uint16_t ident;
 381         uint16_t seq;
 382
 383         pinghost_t *ptr;
 384
 385         if (buffer_len < sizeof (struct icmp6_hdr))
 386                 return (NULL);
 387
 388         icmp_hdr = (struct icmp6_hdr *) buffer;
 389         buffer     += sizeof (struct icmp);
 390         buffer_len -= sizeof (struct icmp);
 391
 392         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 393         {
 394                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 395                 return (NULL);
 396         }
 397
 398         if (icmp_hdr->icmp6_code != 0)
 399         {
 400                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 401                 return (NULL);
 402         }
 403
 404         ident = ntohs (icmp_hdr->icmp6_id);
 405         seq   = ntohs (icmp_hdr->icmp6_seq);
 406
 407         /* We have to iterate over all hosts, since ICMPv6 packets may
 408          * be received on any raw v6 socket. */
 409         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 410         {
 411                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 412                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 413
 414                 if (ptr->addrfamily != AF_INET6)
 415                         continue;
 416
 417                 if (!timerisset (ptr->timer))
 418                         continue;
 419
 420                 if (ptr->ident != ident)
 421                         continue;
 422
 423                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 424                         continue;
 425
 426                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
 427                                 "seq = %"PRIu16"\n",
 428                                 ptr->hostname, ident, seq);
 429
 430                 break;
 431         }
 432
 433         if (ptr == NULL)
 434         {
 435                 dprintf ("No match found for ident = 0x%04"PRIx16", "
 436                                 "seq = %"PRIu16"\n",
 437                                 ident, seq);
 438         }
 439
 440         return (ptr);
 441 }
 442
 443 static int ping_receive_one (pingobj_t *obj, const pinghost_t *ph,
 444                 struct timeval *now)
 445 {
 446         /* Note: 'ph' is not necessarily the host object for which we receive a
 447          * reply. The right object will be returned by ping_receive_ipv*(). For
 448          * now, we can only rely on ph->fd and ph->addrfamily. */
 449
 450         struct timeval diff;
 451         pinghost_t *host = NULL;
 452         int recv_ttl;
 453
 454         /*
 455          * Set up the receive buffer..
 456          */
 457         struct msghdr msghdr;
 458         struct cmsghdr *cmsg;
 459         char payload_buffer[4096];
 460         ssize_t payload_buffer_len;
 461         char control_buffer[4096];
 462         struct iovec payload_iovec;
 463
 464         memset (&payload_iovec, 0, sizeof (payload_iovec));
 465         payload_iovec.iov_base = payload_buffer;
 466         payload_iovec.iov_len = sizeof (payload_buffer);
 467
 468         memset (&msghdr, 0, sizeof (msghdr));
 469         /* unspecified source address */
 470         msghdr.msg_name = NULL;
 471         msghdr.msg_namelen = 0;
 472         /* output buffer vector, see readv(2) */
 473         msghdr.msg_iov = &payload_iovec;
 474         msghdr.msg_iovlen = 1;
 475         /* output buffer for control messages */
 476         msghdr.msg_control = control_buffer;
 477         msghdr.msg_controllen = sizeof (control_buffer);
 478         /* flags; this is an output only field.. */
 479         msghdr.msg_flags = 0;
 480 #ifdef MSG_XPG4_2
 481         msghdr.msg_flags |= MSG_XPG4_2;
 482 #endif
 483
 484         payload_buffer_len = recvmsg (ph->fd, &msghdr, /* flags = */ 0);
 485         if (payload_buffer_len < 0)
 486         {
 487 #if WITH_DEBUG
 488                 char errbuf[PING_ERRMSG_LEN];
 489                 dprintf ("recvfrom: %s\n",
 490                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 491 #endif
 492                 return (-1);
 493         }
 494         dprintf ("Read %zi bytes from fd = %i\n", payload_buffer_len, ph->fd);
 495
 496         /* Iterate over all auxiliary data in msghdr */
 497         recv_ttl = -1;
 498         for (cmsg = CMSG_FIRSTHDR (&msghdr); /* {{{ */
 499                         cmsg != NULL;
 500                         cmsg = CMSG_NXTHDR (&msghdr, cmsg))
 501         {
 502                 if (ph->addrfamily == AF_INET) /* {{{ */
 503                 {
 504                         if (cmsg->cmsg_level != IPPROTO_IP)
 505                                 continue;
 506
 507                         if (cmsg->cmsg_type == IP_TTL)
 508                         {
 509                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 510                                                 sizeof (recv_ttl));
 511                                 dprintf ("TTLv4 = %i;\n", recv_ttl);
 512                         }
 513                         else
 514                         {
 515                                 dprintf ("Not handling option %i.\n",
 516                                                 cmsg->cmsg_type);
 517                         }
 518                 } /* }}} */
 519                 else if (ph->addrfamily == AF_INET6) /* {{{ */
 520                 {
 521                         if (cmsg->cmsg_level != IPPROTO_IPV6)
 522                                 continue;
 523
 524                         if (cmsg->cmsg_type == IPV6_HOPLIMIT)
 525                         {
 526                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 527                                                 sizeof (recv_ttl));
 528                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 529                         }
 530                         else
 531                         {
 532                                 dprintf ("Not handling option %i.\n",
 533                                                 cmsg->cmsg_type);
 534                         }
 535                 } /* }}} */
 536                 else
 537                 {
 538                         dprintf ("Don't know how to handle "
 539                                         "unknown protocol %i.\n",
 540                                         cmsg->cmsg_level);
 541                 }
 542         } /* }}} for (cmsg) */
 543
 544         if (ph->addrfamily == AF_INET)
 545         {
 546                 host = ping_receive_ipv4 (obj, payload_buffer, payload_buffer_len);
 547                 if (host == NULL)
 548                         return (-1);
 549         }
 550         else if (ph->addrfamily == AF_INET6)
 551         {
 552                 host = ping_receive_ipv6 (obj, payload_buffer, payload_buffer_len);
 553                 if (host == NULL)
 554                         return (-1);
 555         }
 556         else
 557         {
 558                 dprintf ("ping_receive_one: Unknown address family %i.\n",
 559                                 ph->addrfamily);
 560                 return (-1);
 561         }
 562
 563         dprintf ("rcvd: %12i.%06i\n",
 564                         (int) now->tv_sec,
 565                         (int) now->tv_usec);
 566         dprintf ("sent: %12i.%06i\n",
 567                         (int) host->timer->tv_sec,
 568                         (int) host->timer->tv_usec);
 569
 570         if (ping_timeval_sub (now, host->timer, &diff) < 0)
 571         {
 572                 timerclear (host->timer);
 573                 return (-1);
 574         }
 575
 576         dprintf ("diff: %12i.%06i\n",
 577                         (int) diff.tv_sec,
 578                         (int) diff.tv_usec);
 579
 580         if (recv_ttl >= 0)
 581                 host->recv_ttl = recv_ttl;
 582
 583         host->latency  = ((double) diff.tv_usec) / 1000.0;
 584         host->latency += ((double) diff.tv_sec)  * 1000.0;
 585
 586         timerclear (host->timer);
 587
 588         return (0);
 589 }
 590
 591 static int ping_receive_all (pingobj_t *obj)
 592 {
 593         fd_set read_fds;
 594         fd_set err_fds;
 595         int num_fds;
 596         int max_fd;
 597
 598         pinghost_t *ph;
 599         pinghost_t *ptr;
 600
 601         struct timeval endtime;
 602         struct timeval nowtime;
 603         struct timeval timeout;
 604         int status;
 605
 606         int ret;
 607
 608         ph = obj->head;
 609         ret = 0;
 610
 611         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 612         {
 613                 ptr->latency  = -1.0;
 614                 ptr->recv_ttl = -1;
 615         }
 616
 617         if (gettimeofday (&nowtime, NULL) == -1)
 618         {
 619                 ping_set_errno (obj, errno);
 620                 return (-1);
 621         }
 622
 623         /* Set up timeout */
 624         timeout.tv_sec = (time_t) obj->timeout;
 625         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 626
 627         dprintf ("Set timeout to %i.%06i seconds\n",
 628                         (int) timeout.tv_sec,
 629                         (int) timeout.tv_usec);
 630
 631         ping_timeval_add (&nowtime, &timeout, &endtime);
 632
 633         while (1)
 634         {
 635                 FD_ZERO (&read_fds);
 636                 FD_ZERO (&err_fds);
 637                 num_fds =  0;
 638                 max_fd = -1;
 639
 640                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 641                 {
 642                         if (!timerisset (ptr->timer))
 643                                 continue;
 644
 645                         FD_SET (ptr->fd, &read_fds);
 646                         FD_SET (ptr->fd, &err_fds);
 647                         num_fds++;
 648
 649                         if (max_fd < ptr->fd)
 650                                 max_fd = ptr->fd;
 651                 }
 652
 653                 if (num_fds == 0)
 654                         break;
 655
 656                 if (gettimeofday (&nowtime, NULL) == -1)
 657                 {
 658                         ping_set_errno (obj, errno);
 659                         return (-1);
 660                 }
 661
 662                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 663                         break;
 664
 665                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_fds,
 666                                 (int) timeout.tv_sec,
 667                                 (int) timeout.tv_usec);
 668
 669                 status = select (max_fd + 1, &read_fds, NULL, &err_fds, &timeout);
 670
 671                 if (gettimeofday (&nowtime, NULL) == -1)
 672                 {
 673                         ping_set_errno (obj, errno);
 674                         return (-1);
 675                 }
 676
 677                 if ((status == -1) && (errno == EINTR))
 678                 {
 679                         dprintf ("select was interrupted by signal..\n");
 680                         continue;
 681                 }
 682                 else if (status < 0)
 683                 {
 684 #if WITH_DEBUG
 685                         char errbuf[PING_ERRMSG_LEN];
 686                         dprintf ("select: %s\n",
 687                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 688 #endif
 689                         break;
 690                 }
 691                 else if (status == 0)
 692                 {
 693                         dprintf ("select timed out\n");
 694                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 695                                 if (ptr->latency < 0.0)
 696                                         ptr->dropped++;
 697                         break;
 698                 }
 699
 700                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 701                 {
 702                         if (FD_ISSET (ptr->fd, &read_fds))
 703                         {
 704                                 if (ping_receive_one (obj, ptr, &nowtime) == 0)
 705                                         ret++;
 706                         }
 707                         else if (FD_ISSET (ptr->fd, &err_fds))
 708                         {
 709                                 /* clear the timer in this case so that we
 710                                  * don't run into an endless loop. */
 711                                 /* TODO: Set an error flag in this case. */
 712                                 timerclear (ptr->timer);
 713                         }
 714                 }
 715         } /* while (1) */
 716
 717         return (ret);
 718 }
 719
 720 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 721  * Sending functions:                                                        *
 722  *                                                                           *
 723  * ping_send_all                                                             *
 724  * +-> ping_send_one_ipv4                                                    *
 725  * `-> ping_send_one_ipv6                                                    *
 726  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 727 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 728                 const void *buf, size_t buflen)
 729 {
 730         ssize_t ret;
 731
 732         if (gettimeofday (ph->timer, NULL) == -1)
 733         {
 734                 timerclear (ph->timer);
 735                 return (-1);
 736         }
 737
 738         ret = sendto (ph->fd, buf, buflen, 0,
 739                         (struct sockaddr *) ph->addr, ph->addrlen);
 740
 741         if (ret < 0)
 742         {
 743 #if defined(EHOSTUNREACH)
 744                 if (errno == EHOSTUNREACH)
 745                         return (0);
 746 #endif
 747 #if defined(ENETUNREACH)
 748                 if (errno == ENETUNREACH)
 749                         return (0);
 750 #endif
 751                 ping_set_errno (obj, errno);
 752         }
 753
 754         return (ret);
 755 }
 756
 757 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 758 {
 759         struct icmp *icmp4;
 760         int status;
 761
 762         char buf[4096];
 763         int  buflen;
 764
 765         char *data;
 766         int   datalen;
 767
 768         dprintf ("ph->hostname = %s\n", ph->hostname);
 769
 770         memset (buf, '\0', sizeof (buf));
 771         icmp4 = (struct icmp *) buf;
 772         data  = (char *) (icmp4 + 1);
 773
 774         icmp4->icmp_type  = ICMP_ECHO;
 775         icmp4->icmp_code  = 0;
 776         icmp4->icmp_cksum = 0;
 777         icmp4->icmp_id    = htons (ph->ident);
 778         icmp4->icmp_seq   = htons (ph->sequence);
 779
 780         buflen = 4096 - sizeof (struct icmp);
 781         strncpy (data, ph->data, buflen);
 782         datalen = strlen (data);
 783
 784         buflen = datalen + sizeof (struct icmp);
 785
 786         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 787
 788         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 789
 790         status = ping_sendto (obj, ph, buf, buflen);
 791         if (status < 0)
 792         {
 793                 perror ("ping_sendto");
 794                 return (-1);
 795         }
 796
 797         dprintf ("sendto: status = %i\n", status);
 798
 799         return (0);
 800 }
 801
 802 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 803 {
 804         struct icmp6_hdr *icmp6;
 805         int status;
 806
 807         char buf[4096];
 808         int  buflen;
 809
 810         char *data;
 811         int   datalen;
 812
 813         dprintf ("ph->hostname = %s\n", ph->hostname);
 814
 815         memset (buf, '\0', sizeof (buf));
 816         icmp6 = (struct icmp6_hdr *) buf;
 817         data  = (char *) (icmp6 + 1);
 818
 819         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 820         icmp6->icmp6_code  = 0;
 821         /* The checksum will be calculated by the TCP/IP stack.  */
 822         /* FIXME */
 823         icmp6->icmp6_cksum = 0;
 824         icmp6->icmp6_id    = htons (ph->ident);
 825         icmp6->icmp6_seq   = htons (ph->sequence);
 826
 827         buflen = 4096 - sizeof (struct icmp6_hdr);
 828         strncpy (data, ph->data, buflen);
 829         datalen = strlen (data);
 830
 831         buflen = datalen + sizeof (struct icmp6_hdr);
 832
 833         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 834
 835         status = ping_sendto (obj, ph, buf, buflen);
 836         if (status < 0)
 837         {
 838                 perror ("ping_sendto");
 839                 return (-1);
 840         }
 841
 842         dprintf ("sendto: status = %i\n", status);
 843
 844         return (0);
 845 }
 846
 847 static int ping_send_all (pingobj_t *obj)
 848 {
 849         pinghost_t *ph;
 850         pinghost_t *ptr;
 851
 852         int ret;
 853
 854         ret = 0;
 855         ph = obj->head;
 856
 857         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 858         {
 859                 /* start timer.. The GNU `ping6' starts the timer before
 860                  * sending the packet, so I will do that too */
 861                 if (gettimeofday (ptr->timer, NULL) == -1)
 862                 {
 863 #if WITH_DEBUG
 864                         char errbuf[PING_ERRMSG_LEN];
 865                         dprintf ("gettimeofday: %s\n",
 866                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 867 #endif
 868                         timerclear (ptr->timer);
 869                         ret--;
 870                         continue;
 871                 }
 872                 else
 873                 {
 874                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 875                 }
 876
 877                 if (ptr->addrfamily == AF_INET6)
 878                 {
 879                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 880                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 881                         {
 882                                 timerclear (ptr->timer);
 883                                 ret--;
 884                                 continue;
 885                         }
 886                 }
 887                 else if (ptr->addrfamily == AF_INET)
 888                 {
 889                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 890                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 891                         {
 892                                 timerclear (ptr->timer);
 893                                 ret--;
 894                                 continue;
 895                         }
 896                 }
 897                 else /* this should not happen */
 898                 {
 899                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 900                         timerclear (ptr->timer);
 901                         ret--;
 902                         continue;
 903                 }
 904
 905                 ptr->sequence++;
 906         }
 907
 908         return (ret);
 909 }
 910
 911 /*
 912  * Set the TTL of a socket protocol independently.
 913  */
 914 static int ping_set_ttl (pinghost_t *ph, int ttl)
 915 {
 916         int ret = -2;
 917
 918         if (ph->addrfamily == AF_INET)
 919         {
 920                 dprintf ("Setting TTLv4 to %i\n", ttl);
 921                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL,
 922                                 &ttl, sizeof (ttl));
 923         }
 924         else if (ph->addrfamily == AF_INET6)
 925         {
 926                 dprintf ("Setting TTLv6 to %i\n", ttl);
 927                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
 928                                 &ttl, sizeof (ttl));
 929         }
 930
 931         return (ret);
 932 }
 933
 934 static int ping_get_ident (void)
 935 {
 936         int fd;
 937         static int did_seed = 0;
 938
 939         int retval;
 940
 941         if (did_seed == 0)
 942         {
 943                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 944                 {
 945                         unsigned int seed;
 946
 947                         if (read (fd, &seed, sizeof (seed)) != -1)
 948                         {
 949                                 did_seed = 1;
 950                                 dprintf ("Random seed:   %#x\n", seed);
 951                                 srandom (seed);
 952                         }
 953
 954                         close (fd);
 955                 }
 956 #if WITH_DEBUG
 957                 else
 958                 {
 959                         char errbuf[PING_ERRMSG_LEN];
 960                         dprintf ("open (/dev/urandom): %s\n",
 961                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 962                 }
 963 #endif
 964         }
 965
 966         retval = (int) random ();
 967
 968         dprintf ("Random number: %#x\n", retval);
 969
 970         return (retval);
 971 }
 972
 973 static pinghost_t *ping_alloc (void)
 974 {
 975         pinghost_t *ph;
 976         size_t      ph_size;
 977
 978         ph_size = sizeof (pinghost_t)
 979                 + sizeof (struct sockaddr_storage)
 980                 + sizeof (struct timeval);
 981
 982         ph = (pinghost_t *) malloc (ph_size);
 983         if (ph == NULL)
 984                 return (NULL);
 985
 986         memset (ph, '\0', ph_size);
 987
 988         ph->timer   = (struct timeval *) (ph + 1);
 989         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
 990
 991         ph->addrlen = sizeof (struct sockaddr_storage);
 992         ph->fd      = -1;
 993         ph->latency = -1.0;
 994         ph->dropped = 0;
 995         ph->ident   = ping_get_ident () & 0xFFFF;
 996
 997         return (ph);
 998 }
 999
1000 static void ping_free (pinghost_t *ph)
1001 {
1002         if (ph->fd >= 0)
1003                 close (ph->fd);
1004
1005         if (ph->username != NULL)
1006                 free (ph->username);
1007
1008         if (ph->hostname != NULL)
1009                 free (ph->hostname);
1010
1011         if (ph->data != NULL)
1012                 free (ph->data);
1013
1014         free (ph);
1015 }
1016
1017 /*
1018  * public methods
1019  */
1020 const char *ping_get_error (pingobj_t *obj)
1021 {
1022         if (obj == NULL)
1023                 return (NULL);
1024         return (obj->errmsg);
1025 }
1026
1027 pingobj_t *ping_construct (void)
1028 {
1029         pingobj_t *obj;
1030
1031         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
1032                 return (NULL);
1033         memset (obj, '\0', sizeof (pingobj_t));
1034
1035         obj->timeout    = PING_DEF_TIMEOUT;
1036         obj->ttl        = PING_DEF_TTL;
1037         obj->addrfamily = PING_DEF_AF;
1038         obj->data       = strdup (PING_DEF_DATA);
1039
1040         return (obj);
1041 }
1042
1043 void ping_destroy (pingobj_t *obj)
1044 {
1045         pinghost_t *current;
1046         pinghost_t *next;
1047
1048         if (obj == NULL)
1049                 return;
1050
1051         current = obj->head;
1052         next = NULL;
1053
1054         while (current != NULL)
1055         {
1056                 next = current->next;
1057                 ping_free (current);
1058                 current = next;
1059         }
1060
1061         if (obj->data != NULL)
1062                 free (obj->data);
1063
1064         if (obj->srcaddr != NULL)
1065                 free (obj->srcaddr);
1066
1067         if (obj->device != NULL)
1068                 free (obj->device);
1069
1070         free (obj);
1071
1072         return;
1073 }
1074
1075 int ping_setopt (pingobj_t *obj, int option, void *value)
1076 {
1077         int ret = 0;
1078
1079         if ((obj == NULL) || (value == NULL))
1080                 return (-1);
1081
1082         switch (option)
1083         {
1084                 case PING_OPT_TIMEOUT:
1085                         obj->timeout = *((double *) value);
1086                         if (obj->timeout < 0.0)
1087                         {
1088                                 obj->timeout = PING_DEF_TIMEOUT;
1089                                 ret = -1;
1090                         }
1091                         break;
1092
1093                 case PING_OPT_TTL:
1094                         obj->ttl = *((int *) value);
1095                         if ((obj->ttl < 1) || (obj->ttl > 255))
1096                         {
1097                                 obj->ttl = PING_DEF_TTL;
1098                                 ret = -1;
1099                         }
1100                         else
1101                         {
1102                                 pinghost_t *ph;
1103
1104                                 for (ph = obj->head; ph != NULL; ph = ph->next)
1105                                         ping_set_ttl (ph, obj->ttl);
1106                         }
1107                         break;
1108
1109                 case PING_OPT_AF:
1110                         obj->addrfamily = *((int *) value);
1111                         if ((obj->addrfamily != AF_UNSPEC)
1112                                         && (obj->addrfamily != AF_INET)
1113                                         && (obj->addrfamily != AF_INET6))
1114                         {
1115                                 obj->addrfamily = PING_DEF_AF;
1116                                 ret = -1;
1117                         }
1118                         if (obj->srcaddr != NULL)
1119                         {
1120                                 free (obj->srcaddr);
1121                                 obj->srcaddr = NULL;
1122                         }
1123                         break;
1124
1125                 case PING_OPT_DATA:
1126                         if (obj->data != NULL)
1127                         {
1128                                 free (obj->data);
1129                                 obj->data = NULL;
1130                         }
1131                         obj->data = strdup ((const char *) value);
1132                         break;
1133
1134                 case PING_OPT_SOURCE:
1135                 {
1136                         char            *hostname = (char *) value;
1137                         struct addrinfo  ai_hints;
1138                         struct addrinfo *ai_list;
1139                         int              status;
1140 #if WITH_DEBUG
1141                         if (obj->addrfamily != AF_UNSPEC)
1142                         {
1143                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1144                         }
1145 #endif
1146                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1147                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1148 #if defined(AI_ADDRCONFIG)
1149                         ai_hints.ai_flags = AI_ADDRCONFIG;
1150 #endif
1151                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1152                         if (status != 0)
1153                         {
1154 #if defined(EAI_SYSTEM)
1155                                 char errbuf[PING_ERRMSG_LEN];
1156 #endif
1157                                 ping_set_error (obj, "getaddrinfo",
1158 #if defined(EAI_SYSTEM)
1159                                                 (status == EAI_SYSTEM)
1160                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1161 #endif
1162                                                 gai_strerror (status));
1163                                 ret = -1;
1164                                 break;
1165                         }
1166 #if WITH_DEBUG
1167                         if (ai_list->ai_next != NULL)
1168                         {
1169                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1170                         }
1171 #endif
1172                         if (obj->srcaddr == NULL)
1173                         {
1174                                 obj->srcaddrlen = 0;
1175                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1176                                 if (obj->srcaddr == NULL)
1177                                 {
1178                                         ping_set_errno (obj, errno);
1179                                         ret = -1;
1180                                         freeaddrinfo (ai_list);
1181                                         break;
1182                                 }
1183                         }
1184                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1185                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1186                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1187                                         ai_list->ai_addrlen);
1188                         obj->srcaddrlen = ai_list->ai_addrlen;
1189                         obj->addrfamily = ai_list->ai_family;
1190
1191                         freeaddrinfo (ai_list);
1192                 } /* case PING_OPT_SOURCE */
1193                 break;
1194
1195                 case PING_OPT_DEVICE:
1196                 {
1197 #ifdef SO_BINDTODEVICE
1198                         char *device = strdup ((char *) value);
1199
1200                         if (device == NULL)
1201                         {
1202                                 ping_set_errno (obj, errno);
1203                                 ret = -1;
1204                                 break;
1205                         }
1206
1207                         if (obj->device != NULL)
1208                                 free (obj->device);
1209                         obj->device = device;
1210 #else /* ! SO_BINDTODEVICE */
1211                         ping_set_errno (obj, ENOTSUP);
1212                         ret = -1;
1213 #endif /* ! SO_BINDTODEVICE */
1214                 } /* case PING_OPT_DEVICE */
1215                 break;
1216
1217                 default:
1218                         ret = -2;
1219         } /* switch (option) */
1220
1221         return (ret);
1222 } /* int ping_setopt */
1223
1224
1225 int ping_send (pingobj_t *obj)
1226 {
1227         int ret;
1228
1229         if (obj == NULL)
1230                 return (-1);
1231
1232         if (ping_send_all (obj) < 0)
1233                 return (-1);
1234
1235         if ((ret = ping_receive_all (obj)) < 0)
1236                 return (-2);
1237
1238         return (ret);
1239 }
1240
1241 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1242 {
1243         while (ph != NULL)
1244         {
1245                 if (strcasecmp (ph->username, host) == 0)
1246                         break;
1247
1248                 ph = ph->next;
1249         }
1250
1251         return (ph);
1252 }
1253
1254 int ping_host_add (pingobj_t *obj, const char *host)
1255 {
1256         pinghost_t *ph;
1257
1258         struct addrinfo  ai_hints;
1259         struct addrinfo *ai_list, *ai_ptr;
1260         int              ai_return;
1261
1262         if ((obj == NULL) || (host == NULL))
1263                 return (-1);
1264
1265         dprintf ("host = %s\n", host);
1266
1267         if (ping_host_search (obj->head, host) != NULL)
1268                 return (0);
1269
1270         memset (&ai_hints, '\0', sizeof (ai_hints));
1271         ai_hints.ai_flags     = 0;
1272 #ifdef AI_ADDRCONFIG
1273         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1274 #endif
1275 #ifdef AI_CANONNAME
1276         ai_hints.ai_flags    |= AI_CANONNAME;
1277 #endif
1278         ai_hints.ai_family    = obj->addrfamily;
1279         ai_hints.ai_socktype  = SOCK_RAW;
1280
1281         if ((ph = ping_alloc ()) == NULL)
1282         {
1283                 dprintf ("Out of memory!\n");
1284                 return (-1);
1285         }
1286
1287         if ((ph->username = strdup (host)) == NULL)
1288         {
1289                 dprintf ("Out of memory!\n");
1290                 ping_set_errno (obj, errno);
1291                 ping_free (ph);
1292                 return (-1);
1293         }
1294
1295         if ((ph->hostname = strdup (host)) == NULL)
1296         {
1297                 dprintf ("Out of memory!\n");
1298                 ping_set_errno (obj, errno);
1299                 ping_free (ph);
1300                 return (-1);
1301         }
1302
1303         /* obj->data is not garuanteed to be != NULL */
1304         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1305         {
1306                 dprintf ("Out of memory!\n");
1307                 ping_set_errno (obj, errno);
1308                 ping_free (ph);
1309                 return (-1);
1310         }
1311
1312         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1313         {
1314 #if defined(EAI_SYSTEM)
1315                 char errbuf[PING_ERRMSG_LEN];
1316 #endif
1317                 dprintf ("getaddrinfo failed\n");
1318                 ping_set_error (obj, "getaddrinfo",
1319 #if defined(EAI_SYSTEM)
1320                                                 (ai_return == EAI_SYSTEM)
1321                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1322 #endif
1323                                 gai_strerror (ai_return));
1324                 ping_free (ph);
1325                 return (-1);
1326         }
1327
1328         if (ai_list == NULL)
1329                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1330
1331         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1332         {
1333                 ph->fd = -1;
1334
1335                 if (ai_ptr->ai_family == AF_INET)
1336                 {
1337                         ai_ptr->ai_socktype = SOCK_RAW;
1338                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1339                 }
1340                 else if (ai_ptr->ai_family == AF_INET6)
1341                 {
1342                         ai_ptr->ai_socktype = SOCK_RAW;
1343                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1344                 }
1345                 else
1346                 {
1347                         char errmsg[PING_ERRMSG_LEN];
1348
1349                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1350                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1351
1352                         dprintf (errmsg);
1353                         ping_set_error (obj, "getaddrinfo", errmsg);
1354                         continue;
1355                 }
1356
1357                 /* TODO: Move this to a static function `ping_open_socket' and
1358                  * call it whenever the socket dies. */
1359                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1360                 if (ph->fd == -1)
1361                 {
1362 #if WITH_DEBUG
1363                         char errbuf[PING_ERRMSG_LEN];
1364                         dprintf ("socket: %s\n",
1365                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1366 #endif
1367                         ping_set_errno (obj, errno);
1368                         continue;
1369                 }
1370
1371                 if (obj->srcaddr != NULL)
1372                 {
1373                         assert (obj->srcaddrlen > 0);
1374                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1375
1376                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1377                         {
1378 #if WITH_DEBUG
1379                                 char errbuf[PING_ERRMSG_LEN];
1380                                 dprintf ("bind: %s\n",
1381                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1382 #endif
1383                                 ping_set_errno (obj, errno);
1384                                 close (ph->fd);
1385                                 ph->fd = -1;
1386                                 continue;
1387                         }
1388                 }
1389
1390 #ifdef SO_BINDTODEVICE
1391                 if (obj->device != NULL)
1392                 {
1393                         if (setsockopt (ph->fd, SOL_SOCKET, SO_BINDTODEVICE,
1394                                         obj->device, strlen (obj->device) + 1) != 0)
1395                         {
1396 #if WITH_DEBUG
1397                                 char errbuf[PING_ERRMSG_LEN];
1398                                 dprintf ("setsockopt: %s\n",
1399                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1400 #endif
1401                                 ping_set_errno (obj, errno);
1402                                 close (ph->fd);
1403                                 ph->fd = -1;
1404                                 continue;
1405                         }
1406                 }
1407 #endif /* SO_BINDTODEVICE */
1408
1409                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1410                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1411                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1412                 ph->addrlen = ai_ptr->ai_addrlen;
1413                 ph->addrfamily = ai_ptr->ai_family;
1414
1415 #ifdef AI_CANONNAME
1416                 if ((ai_ptr->ai_canonname != NULL)
1417                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1418                 {
1419                         char *old_hostname;
1420
1421                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1422                                         ph->hostname, ai_ptr->ai_canonname);
1423
1424                         old_hostname = ph->hostname;
1425                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1426                         {
1427                                 /* strdup failed, falling back to old hostname */
1428                                 ph->hostname = old_hostname;
1429                         }
1430                         else if (old_hostname != NULL)
1431                         {
1432                                 free (old_hostname);
1433                         }
1434                 }
1435 #endif /* AI_CANONNAME */
1436
1437                 if (ph->addrfamily == AF_INET)
1438                 {
1439                         int opt = 1;
1440
1441                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1442                                         &opt, sizeof (opt));
1443                 }
1444 #if defined(IPPROTO_IPV6) && defined(IPV6_RECVHOPLIMIT)
1445                 else if (ph->addrfamily == AF_INET6)
1446                 {
1447                         int opt = 1;
1448
1449                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1450                                         &opt, sizeof (opt));
1451                 }
1452 #endif
1453
1454                 break;
1455         }
1456
1457         freeaddrinfo (ai_list);
1458
1459         if (ph->fd < 0)
1460         {
1461                 ping_free (ph);
1462                 return (-1);
1463         }
1464
1465         /*
1466          * Adding in the front is much easier, but then the iterator will
1467          * return the host that was added last as first host. That's just not
1468          * nice. -octo
1469          */
1470         if (obj->head == NULL)
1471         {
1472                 obj->head = ph;
1473         }
1474         else
1475         {
1476                 pinghost_t *hptr;
1477
1478                 hptr = obj->head;
1479                 while (hptr->next != NULL)
1480                         hptr = hptr->next;
1481
1482                 assert ((hptr != NULL) && (hptr->next == NULL));
1483                 hptr->next = ph;
1484         }
1485
1486         ping_set_ttl (ph, obj->ttl);
1487
1488         return (0);
1489 } /* int ping_host_add */
1490
1491 int ping_host_remove (pingobj_t *obj, const char *host)
1492 {
1493         pinghost_t *pre, *cur;
1494
1495         if ((obj == NULL) || (host == NULL))
1496                 return (-1);
1497
1498         pre = NULL;
1499         cur = obj->head;
1500
1501         while (cur != NULL)
1502         {
1503                 if (strcasecmp (host, cur->username) == 0)
1504                         break;
1505
1506                 pre = cur;
1507                 cur = cur->next;
1508         }
1509
1510         if (cur == NULL)
1511         {
1512                 ping_set_error (obj, "ping_host_remove", "Host not found");
1513                 return (-1);
1514         }
1515
1516         if (pre == NULL)
1517                 obj->head = cur->next;
1518         else
1519                 pre->next = cur->next;
1520
1521         ping_free (cur);
1522
1523         return (0);
1524 }
1525
1526 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1527 {
1528         if (obj == NULL)
1529                 return (NULL);
1530         return ((pingobj_iter_t *) obj->head);
1531 }
1532
1533 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1534 {
1535         if (iter == NULL)
1536                 return (NULL);
1537         return ((pingobj_iter_t *) iter->next);
1538 }
1539
1540 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1541                 void *buffer, size_t *buffer_len)
1542 {
1543         int ret = EINVAL;
1544
1545         size_t orig_buffer_len = *buffer_len;
1546
1547         if ((iter == NULL) || (buffer_len == NULL))
1548                 return (-1);
1549
1550         if ((buffer == NULL) && (*buffer_len != 0 ))
1551                 return (-1);
1552
1553         switch (info)
1554         {
1555                 case PING_INFO_USERNAME:
1556                         ret = ENOMEM;
1557                         *buffer_len = strlen (iter->username) + 1;
1558                         if (orig_buffer_len <= *buffer_len)
1559                                 break;
1560                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1561                          * will copy `*buffer_len' and pad the rest of
1562                          * `buffer' with null-bytes */
1563                         strncpy (buffer, iter->username, orig_buffer_len);
1564                         ret = 0;
1565                         break;
1566
1567                 case PING_INFO_HOSTNAME:
1568                         ret = ENOMEM;
1569                         *buffer_len = strlen (iter->hostname) + 1;
1570                         if (orig_buffer_len < *buffer_len)
1571                                 break;
1572                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1573                          * will copy `*buffer_len' and pad the rest of
1574                          * `buffer' with null-bytes */
1575                         strncpy (buffer, iter->hostname, orig_buffer_len);
1576                         ret = 0;
1577                         break;
1578
1579                 case PING_INFO_ADDRESS:
1580                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1581                                         iter->addrlen,
1582                                         (char *) buffer,
1583                                         *buffer_len,
1584                                         NULL, 0,
1585                                         NI_NUMERICHOST);
1586                         if (ret != 0)
1587                         {
1588                                 if ((ret == EAI_MEMORY)
1589 #ifdef EAI_OVERFLOW
1590                                                 || (ret == EAI_OVERFLOW)
1591 #endif
1592                                    )
1593                                         ret = ENOMEM;
1594 #if defined(EAI_SYSTEM)
1595                                 else if (ret == EAI_SYSTEM)
1596                                         ret = errno;
1597 #endif
1598                                 else
1599                                         ret = EINVAL;
1600                         }
1601                         break;
1602
1603                 case PING_INFO_FAMILY:
1604                         ret = ENOMEM;
1605                         *buffer_len = sizeof (int);
1606                         if (orig_buffer_len < sizeof (int))
1607                                 break;
1608                         *((int *) buffer) = iter->addrfamily;
1609                         ret = 0;
1610                         break;
1611
1612                 case PING_INFO_LATENCY:
1613                         ret = ENOMEM;
1614                         *buffer_len = sizeof (double);
1615                         if (orig_buffer_len < sizeof (double))
1616                                 break;
1617                         *((double *) buffer) = iter->latency;
1618                         ret = 0;
1619                         break;
1620
1621                 case PING_INFO_DROPPED:
1622                         ret = ENOMEM;
1623                         *buffer_len = sizeof (uint32_t);
1624                         if (orig_buffer_len < sizeof (uint32_t))
1625                                 break;
1626                         *((uint32_t *) buffer) = iter->dropped;
1627                         ret = 0;
1628                         break;
1629
1630                 case PING_INFO_SEQUENCE:
1631                         ret = ENOMEM;
1632                         *buffer_len = sizeof (unsigned int);
1633                         if (orig_buffer_len < sizeof (unsigned int))
1634                                 break;
1635                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1636                         ret = 0;
1637                         break;
1638
1639                 case PING_INFO_IDENT:
1640                         ret = ENOMEM;
1641                         *buffer_len = sizeof (uint16_t);
1642                         if (orig_buffer_len < sizeof (uint16_t))
1643                                 break;
1644                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1645                         ret = 0;
1646                         break;
1647
1648                 case PING_INFO_DATA:
1649                         ret = ENOMEM;
1650                         *buffer_len = strlen (iter->data);
1651                         if (orig_buffer_len < *buffer_len)
1652                                 break;
1653                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1654                         ret = 0;
1655                         break;
1656
1657                 case PING_INFO_RECV_TTL:
1658                         ret = ENOMEM;
1659                         *buffer_len = sizeof (int);
1660                         if (orig_buffer_len < sizeof (int))
1661                                 break;
1662                         *((int *) buffer) = iter->recv_ttl;
1663                         ret = 0;
1664                         break;
1665         }
1666
1667         return (ret);
1668 } /* ping_iterator_get_info */
1669
1670 void *ping_iterator_get_context (pingobj_iter_t *iter)
1671 {
1672         if (iter == NULL)
1673                 return (NULL);
1674         return (iter->context);
1675 }
1676
1677 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1678 {
1679         if (iter == NULL)
1680                 return;
1681         iter->context = context;
1682 }