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