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                 dprintf ("Setting TTLv4 to %i\n", ttl);
 876                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL,
 877                                 &ttl, sizeof (ttl));
 878         }
 879         else if (ph->addrfamily == AF_INET6)
 880         {
 881                 dprintf ("Setting TTLv6 to %i\n", ttl);
 882                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
 883                                 &ttl, sizeof (ttl));
 884         }
 885
 886         return (ret);
 887 }
 888
 889 static int ping_get_ident (void)
 890 {
 891         int fd;
 892         static int did_seed = 0;
 893
 894         int retval;
 895
 896         if (did_seed == 0)
 897         {
 898                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 899                 {
 900                         unsigned int seed;
 901
 902                         if (read (fd, &seed, sizeof (seed)) != -1)
 903                         {
 904                                 did_seed = 1;
 905                                 dprintf ("Random seed:   %#x\n", seed);
 906                                 srandom (seed);
 907                         }
 908
 909                         close (fd);
 910                 }
 911 #if WITH_DEBUG
 912                 else
 913                 {
 914                         char errbuf[PING_ERRMSG_LEN];
 915                         dprintf ("open (/dev/urandom): %s\n",
 916                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 917                 }
 918 #endif
 919         }
 920
 921         retval = (int) random ();
 922
 923         dprintf ("Random number: %#x\n", retval);
 924
 925         return (retval);
 926 }
 927
 928 static pinghost_t *ping_alloc (void)
 929 {
 930         pinghost_t *ph;
 931         size_t      ph_size;
 932
 933         ph_size = sizeof (pinghost_t)
 934                 + sizeof (struct sockaddr_storage)
 935                 + sizeof (struct timeval);
 936
 937         ph = (pinghost_t *) malloc (ph_size);
 938         if (ph == NULL)
 939                 return (NULL);
 940
 941         memset (ph, '\0', ph_size);
 942
 943         ph->timer   = (struct timeval *) (ph + 1);
 944         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
 945
 946         ph->addrlen = sizeof (struct sockaddr_storage);
 947         ph->fd      = -1;
 948         ph->latency = -1.0;
 949         ph->dropped = 0;
 950         ph->ident   = ping_get_ident () & 0xFFFF;
 951
 952         return (ph);
 953 }
 954
 955 static void ping_free (pinghost_t *ph)
 956 {
 957         if (ph->fd >= 0)
 958                 close (ph->fd);
 959
 960         if (ph->username != NULL)
 961                 free (ph->username);
 962
 963         if (ph->hostname != NULL)
 964                 free (ph->hostname);
 965
 966         if (ph->data != NULL)
 967                 free (ph->data);
 968
 969         free (ph);
 970 }
 971
 972 /*
 973  * public methods
 974  */
 975 const char *ping_get_error (pingobj_t *obj)
 976 {
 977         return (obj->errmsg);
 978 }
 979
 980 pingobj_t *ping_construct (void)
 981 {
 982         pingobj_t *obj;
 983
 984         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
 985                 return (NULL);
 986         memset (obj, '\0', sizeof (pingobj_t));
 987
 988         obj->timeout    = PING_DEF_TIMEOUT;
 989         obj->ttl        = PING_DEF_TTL;
 990         obj->addrfamily = PING_DEF_AF;
 991         obj->data       = strdup (PING_DEF_DATA);
 992
 993         return (obj);
 994 }
 995
 996 void ping_destroy (pingobj_t *obj)
 997 {
 998         pinghost_t *current;
 999         pinghost_t *next;
1000
1001         current = obj->head;
1002         next = NULL;
1003
1004         while (current != NULL)
1005         {
1006                 next = current->next;
1007                 ping_free (current);
1008                 current = next;
1009         }
1010
1011         if (obj->data != NULL)
1012                 free (obj->data);
1013
1014         if (obj->srcaddr != NULL)
1015                 free (obj->srcaddr);
1016
1017         free (obj);
1018
1019         return;
1020 }
1021
1022 int ping_setopt (pingobj_t *obj, int option, void *value)
1023 {
1024         int ret = 0;
1025
1026         switch (option)
1027         {
1028                 case PING_OPT_TIMEOUT:
1029                         obj->timeout = *((double *) value);
1030                         if (obj->timeout < 0.0)
1031                         {
1032                                 obj->timeout = PING_DEF_TIMEOUT;
1033                                 ret = -1;
1034                         }
1035                         break;
1036
1037                 case PING_OPT_TTL:
1038                         obj->ttl = *((int *) value);
1039                         if ((obj->ttl < 1) || (obj->ttl > 255))
1040                         {
1041                                 obj->ttl = PING_DEF_TTL;
1042                                 ret = -1;
1043                         }
1044                         else
1045                         {
1046                                 pinghost_t *ph;
1047
1048                                 for (ph = obj->head; ph != NULL; ph = ph->next)
1049                                         ping_set_ttl (ph, obj->ttl);
1050                         }
1051                         break;
1052
1053                 case PING_OPT_AF:
1054                         obj->addrfamily = *((int *) value);
1055                         if ((obj->addrfamily != AF_UNSPEC)
1056                                         && (obj->addrfamily != AF_INET)
1057                                         && (obj->addrfamily != AF_INET6))
1058                         {
1059                                 obj->addrfamily = PING_DEF_AF;
1060                                 ret = -1;
1061                         }
1062                         if (obj->srcaddr != NULL)
1063                         {
1064                                 free (obj->srcaddr);
1065                                 obj->srcaddr = NULL;
1066                         }
1067                         break;
1068
1069                 case PING_OPT_DATA:
1070                         if (obj->data != NULL)
1071                         {
1072                                 free (obj->data);
1073                                 obj->data = NULL;
1074                         }
1075                         obj->data = strdup ((const char *) value);
1076                         break;
1077
1078                 case PING_OPT_SOURCE:
1079                 {
1080                         char            *hostname = (char *) value;
1081                         struct addrinfo  ai_hints;
1082                         struct addrinfo *ai_list;
1083                         int              status;
1084 #if WITH_DEBUG
1085                         if (obj->addrfamily != AF_UNSPEC)
1086                         {
1087                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1088                         }
1089 #endif
1090                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1091                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1092 #if defined(AI_ADDRCONFIG)
1093                         ai_hints.ai_flags = AI_ADDRCONFIG;
1094 #endif
1095                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1096                         if (status != 0)
1097                         {
1098 #if defined(EAI_SYSTEM)
1099                                 char errbuf[PING_ERRMSG_LEN];
1100 #endif
1101                                 ping_set_error (obj, "getaddrinfo",
1102 #if defined(EAI_SYSTEM)
1103                                                 (status == EAI_SYSTEM)
1104                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1105 #endif
1106                                                 gai_strerror (status));
1107                                 ret = -1;
1108                                 break;
1109                         }
1110 #if WITH_DEBUG
1111                         if (ai_list->ai_next != NULL)
1112                         {
1113                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1114                         }
1115 #endif
1116                         if (obj->srcaddr == NULL)
1117                         {
1118                                 obj->srcaddrlen = 0;
1119                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1120                                 if (obj->srcaddr == NULL)
1121                                 {
1122                                         ping_set_errno (obj, errno);
1123                                         ret = -1;
1124                                         freeaddrinfo (ai_list);
1125                                         break;
1126                                 }
1127                         }
1128                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1129                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1130                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1131                                         ai_list->ai_addrlen);
1132                         obj->srcaddrlen = ai_list->ai_addrlen;
1133                         obj->addrfamily = ai_list->ai_family;
1134
1135                         freeaddrinfo (ai_list);
1136                 } /* case PING_OPT_SOURCE */
1137                 break;
1138
1139                 default:
1140                         ret = -2;
1141         } /* switch (option) */
1142
1143         return (ret);
1144 } /* int ping_setopt */
1145
1146
1147 int ping_send (pingobj_t *obj)
1148 {
1149         int ret;
1150
1151         if (ping_send_all (obj) < 0)
1152                 return (-1);
1153
1154         if ((ret = ping_receive_all (obj)) < 0)
1155                 return (-2);
1156
1157         return (ret);
1158 }
1159
1160 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1161 {
1162         while (ph != NULL)
1163         {
1164                 if (strcasecmp (ph->username, host) == 0)
1165                         break;
1166
1167                 ph = ph->next;
1168         }
1169
1170         return (ph);
1171 }
1172
1173 int ping_host_add (pingobj_t *obj, const char *host)
1174 {
1175         pinghost_t *ph;
1176
1177         struct addrinfo  ai_hints;
1178         struct addrinfo *ai_list, *ai_ptr;
1179         int              ai_return;
1180
1181         dprintf ("host = %s\n", host);
1182
1183         if (ping_host_search (obj->head, host) != NULL)
1184                 return (0);
1185
1186         memset (&ai_hints, '\0', sizeof (ai_hints));
1187         ai_hints.ai_flags     = 0;
1188 #ifdef AI_ADDRCONFIG
1189         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1190 #endif
1191 #ifdef AI_CANONNAME
1192         ai_hints.ai_flags    |= AI_CANONNAME;
1193 #endif
1194         ai_hints.ai_family    = obj->addrfamily;
1195         ai_hints.ai_socktype  = SOCK_RAW;
1196
1197         if ((ph = ping_alloc ()) == NULL)
1198         {
1199                 dprintf ("Out of memory!\n");
1200                 return (-1);
1201         }
1202
1203         if ((ph->username = strdup (host)) == NULL)
1204         {
1205                 dprintf ("Out of memory!\n");
1206                 ping_set_errno (obj, errno);
1207                 ping_free (ph);
1208                 return (-1);
1209         }
1210
1211         if ((ph->hostname = strdup (host)) == NULL)
1212         {
1213                 dprintf ("Out of memory!\n");
1214                 ping_set_errno (obj, errno);
1215                 ping_free (ph);
1216                 return (-1);
1217         }
1218
1219         /* obj->data is not garuanteed to be != NULL */
1220         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1221         {
1222                 dprintf ("Out of memory!\n");
1223                 ping_set_errno (obj, errno);
1224                 ping_free (ph);
1225                 return (-1);
1226         }
1227
1228         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1229         {
1230 #if defined(EAI_SYSTEM)
1231                 char errbuf[PING_ERRMSG_LEN];
1232 #endif
1233                 dprintf ("getaddrinfo failed\n");
1234                 ping_set_error (obj, "getaddrinfo",
1235 #if defined(EAI_SYSTEM)
1236                                                 (ai_return == EAI_SYSTEM)
1237                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1238 #endif
1239                                 gai_strerror (ai_return));
1240                 ping_free (ph);
1241                 return (-1);
1242         }
1243
1244         if (ai_list == NULL)
1245                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1246
1247         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1248         {
1249                 ph->fd = -1;
1250
1251                 if (ai_ptr->ai_family == AF_INET)
1252                 {
1253                         ai_ptr->ai_socktype = SOCK_RAW;
1254                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1255                 }
1256                 else if (ai_ptr->ai_family == AF_INET6)
1257                 {
1258                         ai_ptr->ai_socktype = SOCK_RAW;
1259                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1260                 }
1261                 else
1262                 {
1263                         char errmsg[PING_ERRMSG_LEN];
1264
1265                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1266                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1267
1268                         dprintf (errmsg);
1269                         ping_set_error (obj, "getaddrinfo", errmsg);
1270                         continue;
1271                 }
1272
1273                 /* TODO: Move this to a static function `ping_open_socket' and
1274                  * call it whenever the socket dies. */
1275                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1276                 if (ph->fd == -1)
1277                 {
1278 #if WITH_DEBUG
1279                         char errbuf[PING_ERRMSG_LEN];
1280                         dprintf ("socket: %s\n",
1281                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1282 #endif
1283                         ping_set_errno (obj, errno);
1284                         continue;
1285                 }
1286
1287                 if (obj->srcaddr != NULL)
1288                 {
1289                         assert (obj->srcaddrlen > 0);
1290                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1291
1292                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1293                         {
1294 #if WITH_DEBUG
1295                                 char errbuf[PING_ERRMSG_LEN];
1296                                 dprintf ("bind: %s\n",
1297                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1298 #endif
1299                                 ping_set_errno (obj, errno);
1300                                 close (ph->fd);
1301                                 ph->fd = -1;
1302                                 continue;
1303                         }
1304                 }
1305
1306                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1307                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1308                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1309                 ph->addrlen = ai_ptr->ai_addrlen;
1310                 ph->addrfamily = ai_ptr->ai_family;
1311
1312 #ifdef AI_CANONNAME
1313                 if ((ai_ptr->ai_canonname != NULL)
1314                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1315                 {
1316                         char *old_hostname;
1317
1318                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1319                                         ph->hostname, ai_ptr->ai_canonname);
1320
1321                         old_hostname = ph->hostname;
1322                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1323                         {
1324                                 /* strdup failed, falling back to old hostname */
1325                                 ph->hostname = old_hostname;
1326                         }
1327                         else if (old_hostname != NULL)
1328                         {
1329                                 free (old_hostname);
1330                         }
1331                 }
1332 #endif /* AI_CANONNAME */
1333
1334                 if (ph->addrfamily == AF_INET)
1335                 {
1336                         int opt = 1;
1337
1338                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1339                                         &opt, sizeof (opt));
1340                 }
1341                 else if (ph->addrfamily == AF_INET6)
1342                 {
1343                         int opt = 1;
1344
1345                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1346                                         &opt, sizeof (opt));
1347                 }
1348
1349                 break;
1350         }
1351
1352         freeaddrinfo (ai_list);
1353
1354         if (ph->fd < 0)
1355         {
1356                 ping_free (ph);
1357                 return (-1);
1358         }
1359
1360         /*
1361          * Adding in the front is much easier, but then the iterator will
1362          * return the host that was added last as first host. That's just not
1363          * nice. -octo
1364          */
1365         if (obj->head == NULL)
1366         {
1367                 obj->head = ph;
1368         }
1369         else
1370         {
1371                 pinghost_t *hptr;
1372
1373                 hptr = obj->head;
1374                 while (hptr->next != NULL)
1375                         hptr = hptr->next;
1376
1377                 assert ((hptr != NULL) && (hptr->next == NULL));
1378                 hptr->next = ph;
1379         }
1380
1381         ping_set_ttl (ph, obj->ttl);
1382
1383         return (0);
1384 } /* int ping_host_add */
1385
1386 int ping_host_remove (pingobj_t *obj, const char *host)
1387 {
1388         pinghost_t *pre, *cur;
1389
1390         pre = NULL;
1391         cur = obj->head;
1392
1393         while (cur != NULL)
1394         {
1395                 if (strcasecmp (host, cur->username) == 0)
1396                         break;
1397
1398                 pre = cur;
1399                 cur = cur->next;
1400         }
1401
1402         if (cur == NULL)
1403         {
1404                 ping_set_error (obj, "ping_host_remove", "Host not found");
1405                 return (-1);
1406         }
1407
1408         if (pre == NULL)
1409                 obj->head = cur->next;
1410         else
1411                 pre->next = cur->next;
1412
1413         ping_free (cur);
1414
1415         return (0);
1416 }
1417
1418 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1419 {
1420         return ((pingobj_iter_t *) obj->head);
1421 }
1422
1423 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1424 {
1425         return ((pingobj_iter_t *) iter->next);
1426 }
1427
1428 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1429                 void *buffer, size_t *buffer_len)
1430 {
1431         int ret = EINVAL;
1432
1433         size_t orig_buffer_len = *buffer_len;
1434
1435         switch (info)
1436         {
1437                 case PING_INFO_USERNAME:
1438                         ret = ENOMEM;
1439                         *buffer_len = strlen (iter->username) + 1;
1440                         if (orig_buffer_len <= *buffer_len)
1441                                 break;
1442                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1443                          * will copy `*buffer_len' and pad the rest of
1444                          * `buffer' with null-bytes */
1445                         strncpy (buffer, iter->username, orig_buffer_len);
1446                         ret = 0;
1447                         break;
1448
1449                 case PING_INFO_HOSTNAME:
1450                         ret = ENOMEM;
1451                         *buffer_len = strlen (iter->hostname) + 1;
1452                         if (orig_buffer_len < *buffer_len)
1453                                 break;
1454                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1455                          * will copy `*buffer_len' and pad the rest of
1456                          * `buffer' with null-bytes */
1457                         strncpy (buffer, iter->hostname, orig_buffer_len);
1458                         ret = 0;
1459                         break;
1460
1461                 case PING_INFO_ADDRESS:
1462                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1463                                         iter->addrlen,
1464                                         (char *) buffer,
1465                                         *buffer_len,
1466                                         NULL, 0,
1467                                         NI_NUMERICHOST);
1468                         if (ret != 0)
1469                         {
1470                                 if ((ret == EAI_MEMORY)
1471 #ifdef EAI_OVERFLOW
1472                                                 || (ret == EAI_OVERFLOW)
1473 #endif
1474                                    )
1475                                         ret = ENOMEM;
1476 #if defined(EAI_SYSTEM)
1477                                 else if (ret == EAI_SYSTEM)
1478                                         ret = errno;
1479 #endif
1480                                 else
1481                                         ret = EINVAL;
1482                         }
1483                         break;
1484
1485                 case PING_INFO_FAMILY:
1486                         ret = ENOMEM;
1487                         *buffer_len = sizeof (int);
1488                         if (orig_buffer_len < sizeof (int))
1489                                 break;
1490                         *((int *) buffer) = iter->addrfamily;
1491                         ret = 0;
1492                         break;
1493
1494                 case PING_INFO_LATENCY:
1495                         ret = ENOMEM;
1496                         *buffer_len = sizeof (double);
1497                         if (orig_buffer_len < sizeof (double))
1498                                 break;
1499                         *((double *) buffer) = iter->latency;
1500                         ret = 0;
1501                         break;
1502
1503                 case PING_INFO_DROPPED:
1504                         ret = ENOMEM;
1505                         *buffer_len = sizeof (uint32_t);
1506                         if (orig_buffer_len < sizeof (uint32_t))
1507                                 break;
1508                         *((uint32_t *) buffer) = iter->dropped;
1509                         ret = 0;
1510                         break;
1511
1512                 case PING_INFO_SEQUENCE:
1513                         ret = ENOMEM;
1514                         *buffer_len = sizeof (unsigned int);
1515                         if (orig_buffer_len < sizeof (unsigned int))
1516                                 break;
1517                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1518                         ret = 0;
1519                         break;
1520
1521                 case PING_INFO_IDENT:
1522                         ret = ENOMEM;
1523                         *buffer_len = sizeof (uint16_t);
1524                         if (orig_buffer_len < sizeof (uint16_t))
1525                                 break;
1526                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1527                         ret = 0;
1528                         break;
1529
1530                 case PING_INFO_DATA:
1531                         ret = ENOMEM;
1532                         *buffer_len = strlen (iter->data);
1533                         if (orig_buffer_len < *buffer_len)
1534                                 break;
1535                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1536                         ret = 0;
1537                         break;
1538
1539                 case PING_INFO_RECV_TTL:
1540                         ret = ENOMEM;
1541                         *buffer_len = sizeof (int);
1542                         if (orig_buffer_len < sizeof (int))
1543                                 break;
1544                         *((int *) buffer) = iter->recv_ttl;
1545                         ret = 0;
1546                         break;
1547         }
1548
1549         return (ret);
1550 } /* ping_iterator_get_info */
1551
1552 void *ping_iterator_get_context (pingobj_iter_t *iter)
1553 {
1554         return (iter->context);
1555 }
1556
1557 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1558 {
1559         iter->context = context;
1560 }