src/liboping.c

   1 /**
   2  * Object oriented C module to send ICMP and ICMPv6 `echo's.
   3  * Copyright (C) 2006-2009  Florian octo Forster <octo at verplant.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; only version 2 of the License is
   8  * applicable.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  18  */
  19
  20 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #if STDC_HEADERS
  25 # include <stdlib.h>
  26 # include <stdio.h>
  27 # include <string.h>
  28 # include <inttypes.h>
  29 # include <errno.h>
  30 # include <assert.h>
  31 #else
  32 # error "You don't have the standard C99 header files installed"
  33 #endif /* STDC_HEADERS */
  34
  35 #ifdef HAVE_STDINT_H
  36 # include <stdint.h>
  37 #endif
  38
  39 #if HAVE_UNISTD_H
  40 # include <unistd.h>
  41 #endif
  42
  43 #if HAVE_FCNTL_H
  44 # include <fcntl.h>
  45 #endif
  46 #if HAVE_SYS_TYPES_H
  47 # include <sys/types.h>
  48 #endif
  49 #if HAVE_SYS_STAT_H
  50 # include <sys/stat.h>
  51 #endif
  52
  53 #if TIME_WITH_SYS_TIME
  54 # include <sys/time.h>
  55 # include <time.h>
  56 #else
  57 # if HAVE_SYS_TIME_H
  58 #  include <sys/time.h>
  59 # else
  60 #  include <time.h>
  61 # endif
  62 #endif
  63
  64 #if HAVE_SYS_SOCKET_H
  65 # include <sys/socket.h>
  66 #endif
  67
  68 #if HAVE_NETDB_H
  69 # include <netdb.h>
  70 #endif
  71
  72 #if HAVE_NETINET_IN_SYSTM_H
  73 # include <netinet/in_systm.h>
  74 #endif
  75 #if HAVE_NETINET_IN_H
  76 # include <netinet/in.h>
  77 #endif
  78 #if HAVE_NETINET_IP_H
  79 # include <netinet/ip.h>
  80 #endif
  81 #if HAVE_NETINET_IP_ICMP_H
  82 # include <netinet/ip_icmp.h>
  83 #endif
  84 #ifdef HAVE_NETINET_IP_VAR_H
  85 # include <netinet/ip_var.h>
  86 #endif
  87 #if HAVE_NETINET_IP6_H
  88 # include <netinet/ip6.h>
  89 #endif
  90 #if HAVE_NETINET_ICMP6_H
  91 # include <netinet/icmp6.h>
  92 #endif
  93
  94 #include "oping.h"
  95
  96 #if WITH_DEBUG
  97 # define dprintf(...) printf ("%s[%4i]: %-20s: ", __FILE__, __LINE__, __FUNCTION__); printf (__VA_ARGS__)
  98 #else
  99 # define dprintf(...) /**/
 100 #endif
 101
 102 #define PING_ERRMSG_LEN 256
 103
 104 struct pinghost
 105 {
 106         /* username: name passed in by the user */
 107         char                    *username;
 108         /* hostname: name returned by the reverse lookup */
 109         char                    *hostname;
 110         struct sockaddr_storage *addr;
 111         socklen_t                addrlen;
 112         int                      addrfamily;
 113         int                      fd;
 114         int                      ident;
 115         int                      sequence;
 116         struct timeval          *timer;
 117         double                   latency;
 118         uint32_t                 dropped;
 119         int                      recv_ttl;
 120         char                    *data;
 121
 122         void                    *context;
 123
 124         struct pinghost         *next;
 125 };
 126
 127 struct pingobj
 128 {
 129         double                   timeout;
 130         int                      ttl;
 131         int                      addrfamily;
 132         char                    *data;
 133
 134         struct sockaddr         *srcaddr;
 135         socklen_t                srcaddrlen;
 136
 137         char                     errmsg[PING_ERRMSG_LEN];
 138
 139         pinghost_t              *head;
 140 };
 141
 142 /*
 143  * private (static) functions
 144  */
 145 /* Even though Posix requires "strerror_r" to return an "int",
 146  * some systems (e.g. the GNU libc) return a "char *" _and_
 147  * ignore the second argument ... -tokkee */
 148 char *sstrerror (int errnum, char *buf, size_t buflen)
 149 {
 150         buf[0] = 0;
 151
 152 #if !HAVE_STRERROR_R
 153         {
 154                 snprintf (buf, buflen, "Error %i (%#x)", errnum, errnum);
 155         }
 156 /* #endif !HAVE_STRERROR_R */
 157
 158 #elif STRERROR_R_CHAR_P
 159         {
 160                 char *temp;
 161                 temp = strerror_r (errnum, buf, buflen);
 162                 if (buf[0] == 0)
 163                 {
 164                         if ((temp != NULL) && (temp != buf) && (temp[0] != 0))
 165                                 strncpy (buf, temp, buflen);
 166                         else
 167                                 strncpy (buf, "strerror_r did not return "
 168                                                 "an error message", buflen);
 169                 }
 170         }
 171 /* #endif STRERROR_R_CHAR_P */
 172
 173 #else
 174         if (strerror_r (errnum, buf, buflen) != 0)
 175         {
 176                 snprintf (buf, buflen, "Error %i (%#x); "
 177                                 "Additionally, strerror_r failed.",
 178                                 errnum, errnum);
 179         }
 180 #endif /* STRERROR_R_CHAR_P */
 181
 182         buf[buflen - 1] = 0;
 183
 184         return (buf);
 185 } /* char *sstrerror */
 186
 187 static void ping_set_error (pingobj_t *obj, const char *function,
 188                 const char *message)
 189 {
 190         snprintf (obj->errmsg, sizeof (obj->errmsg),
 191                         "%s: %s", function, message);
 192         obj->errmsg[sizeof (obj->errmsg) - 1] = 0;
 193 }
 194
 195 static void ping_set_errno (pingobj_t *obj, int error_number)
 196 {
 197         sstrerror (error_number, obj->errmsg, sizeof (obj->errmsg));
 198 }
 199
 200 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
 201                 struct timeval *res)
 202 {
 203         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
 204         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
 205
 206         while (res->tv_usec > 1000000)
 207         {
 208                 res->tv_usec -= 1000000;
 209                 res->tv_sec++;
 210         }
 211
 212         return (0);
 213 }
 214
 215 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
 216                 struct timeval *res)
 217 {
 218         if ((tv1->tv_sec < tv2->tv_sec)
 219                         || ((tv1->tv_sec == tv2->tv_sec)
 220                                 && (tv1->tv_usec < tv2->tv_usec)))
 221                 return (-1);
 222
 223         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
 224         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
 225
 226         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec >= 0)));
 227
 228         while (res->tv_usec < 0)
 229         {
 230                 res->tv_usec += 1000000;
 231                 res->tv_sec--;
 232         }
 233
 234         return (0);
 235 }
 236
 237 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
 238 {
 239         uint32_t sum = 0;
 240         uint16_t ret = 0;
 241
 242         uint16_t *ptr;
 243
 244         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
 245                 sum += *ptr;
 246
 247         if (len == 1)
 248         {
 249                 *(char *) &ret = *(char *) ptr;
 250                 sum += ret;
 251         }
 252
 253         /* Do this twice to get all possible carries.. */
 254         sum = (sum >> 16) + (sum & 0xFFFF);
 255         sum = (sum >> 16) + (sum & 0xFFFF);
 256
 257         ret = ~sum;
 258
 259         return (ret);
 260 }
 261
 262 static pinghost_t *ping_receive_ipv4 (pinghost_t *ph, char *buffer, size_t buffer_len)
 263 {
 264         struct ip *ip_hdr;
 265         struct icmp *icmp_hdr;
 266
 267         size_t ip_hdr_len;
 268
 269         uint16_t recv_checksum;
 270         uint16_t calc_checksum;
 271
 272         uint16_t ident;
 273         uint16_t seq;
 274
 275         pinghost_t *ptr;
 276
 277         if (buffer_len < sizeof (struct ip))
 278                 return (NULL);
 279
 280         ip_hdr     = (struct ip *) buffer;
 281         ip_hdr_len = ip_hdr->ip_hl << 2;
 282
 283         if (buffer_len < ip_hdr_len)
 284                 return (NULL);
 285
 286         buffer     += ip_hdr_len;
 287         buffer_len -= ip_hdr_len;
 288
 289         if (buffer_len < sizeof (struct icmp))
 290                 return (NULL);
 291
 292         icmp_hdr = (struct icmp *) buffer;
 293         buffer     += sizeof (struct icmp);
 294         buffer_len -= sizeof (struct icmp);
 295
 296         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
 297         {
 298                 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
 299                 return (NULL);
 300         }
 301
 302         recv_checksum = icmp_hdr->icmp_cksum;
 303         icmp_hdr->icmp_cksum = 0;
 304         calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
 305                         sizeof (struct icmp) + buffer_len);
 306
 307         if (recv_checksum != calc_checksum)
 308         {
 309                 dprintf ("Checksum missmatch: Got 0x%04x, calculated 0x%04x\n",
 310                                 recv_checksum, calc_checksum);
 311                 return (NULL);
 312         }
 313
 314         ident = ntohs (icmp_hdr->icmp_id);
 315         seq   = ntohs (icmp_hdr->icmp_seq);
 316
 317         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 318         {
 319                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 320                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 321
 322                 if (ptr->addrfamily != AF_INET)
 323                         continue;
 324
 325                 if (!timerisset (ptr->timer))
 326                         continue;
 327
 328                 if (ptr->ident != ident)
 329                         continue;
 330
 331                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 332                         continue;
 333
 334                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
 335                                 ptr->hostname, ident, seq);
 336
 337                 break;
 338         }
 339
 340         if (ptr == NULL)
 341         {
 342                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
 343                                 ident, seq);
 344         }
 345
 346         if (ptr != NULL)
 347                 ptr->recv_ttl = ip_hdr->ip_ttl;
 348
 349         return (ptr);
 350 }
 351
 352 #ifndef ICMP6_ECHO_REQUEST
 353 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
 354 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
 355 # else
 356 #  define ICMP6_ECHO_REQUEST 128
 357 # endif
 358 #endif
 359
 360 #ifndef ICMP6_ECHO_REPLY
 361 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
 362 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
 363 # else
 364 #  define ICMP6_ECHO_REPLY 129
 365 # endif
 366 #endif
 367
 368 static pinghost_t *ping_receive_ipv6 (pinghost_t *ph, char *buffer, size_t buffer_len)
 369 {
 370         struct icmp6_hdr *icmp_hdr;
 371
 372         uint16_t ident;
 373         uint16_t seq;
 374
 375         pinghost_t *ptr;
 376
 377         if (buffer_len < sizeof (struct icmp6_hdr))
 378                 return (NULL);
 379
 380         icmp_hdr = (struct icmp6_hdr *) buffer;
 381         buffer     += sizeof (struct icmp);
 382         buffer_len -= sizeof (struct icmp);
 383
 384         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 385         {
 386                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 387                 return (NULL);
 388         }
 389
 390         if (icmp_hdr->icmp6_code != 0)
 391         {
 392                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 393                 return (NULL);
 394         }
 395
 396         ident = ntohs (icmp_hdr->icmp6_id);
 397         seq   = ntohs (icmp_hdr->icmp6_seq);
 398
 399         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 400         {
 401                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 402                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 403
 404                 if (ptr->addrfamily != AF_INET6)
 405                         continue;
 406
 407                 if (!timerisset (ptr->timer))
 408                         continue;
 409
 410                 if (ptr->ident != ident)
 411                         continue;
 412
 413                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 414                         continue;
 415
 416                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
 417                                 ptr->hostname, ident, seq);
 418
 419                 break;
 420         }
 421
 422         if (ptr == NULL)
 423         {
 424                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
 425                                 ident, seq);
 426         }
 427
 428         return (ptr);
 429 }
 430
 431 static int ping_receive_one (int fd, pinghost_t *ph, struct timeval *now)
 432 {
 433         struct timeval diff;
 434         pinghost_t *host = NULL;
 435         int recv_ttl;
 436
 437         /*
 438          * Set up the receive buffer..
 439          */
 440         struct msghdr msghdr;
 441         struct cmsghdr *cmsg;
 442         char payload_buffer[4096];
 443         ssize_t payload_buffer_len;
 444         char control_buffer[4096];
 445         struct iovec payload_iovec;
 446
 447         memset (&payload_iovec, 0, sizeof (payload_iovec));
 448         payload_iovec.iov_base = payload_buffer;
 449         payload_iovec.iov_len = sizeof (payload_buffer);
 450
 451         memset (&msghdr, 0, sizeof (msghdr));
 452         /* unspecified source address */
 453         msghdr.msg_name = NULL;
 454         msghdr.msg_namelen = 0;
 455         /* output buffer vector, see readv(2) */
 456         msghdr.msg_iov = &payload_iovec;
 457         msghdr.msg_iovlen = 1;
 458         /* output buffer for control messages */
 459         msghdr.msg_control = control_buffer;
 460         msghdr.msg_controllen = sizeof (control_buffer);
 461         /* flags; this is an output only field.. */
 462         msghdr.msg_flags = 0;
 463 #ifdef MSG_XPG4_2
 464         msghdr.msg_flags |= MSG_XPG4_2;
 465 #endif
 466
 467         payload_buffer_len = recvmsg (fd, &msghdr, /* flags = */ 0);
 468         if (payload_buffer_len < 0)
 469         {
 470 #if WITH_DEBUG
 471                 char errbuf[PING_ERRMSG_LEN];
 472                 dprintf ("recvfrom: %s\n",
 473                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 474 #endif
 475                 return (-1);
 476         }
 477         dprintf ("Read %zi bytes from fd = %i\n", payload_buffer_len, fd);
 478
 479         /* Iterate over all auxiliary data in msghdr */
 480         recv_ttl = -1;
 481         ph->recv_ttl = -1;
 482         for (cmsg = CMSG_FIRSTHDR (&msghdr); /* {{{ */
 483                         cmsg != NULL;
 484                         cmsg = CMSG_NXTHDR (&msghdr, cmsg))
 485         {
 486                 if (ph->addrfamily == AF_INET) /* {{{ */
 487                 {
 488                         if (cmsg->cmsg_level != IPPROTO_IP)
 489                                 continue;
 490
 491                         if (cmsg->cmsg_type == IP_TTL)
 492                         {
 493                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 494                                                 sizeof (recv_ttl));
 495                                 dprintf ("TTLv4 = %i;\n", recv_ttl);
 496                         }
 497                         else
 498                         {
 499                                 dprintf ("Not handling option %i.\n",
 500                                                 cmsg->cmsg_type);
 501                         }
 502                 } /* }}} */
 503                 else if (ph->addrfamily == AF_INET6) /* {{{ */
 504                 {
 505                         if (cmsg->cmsg_level != IPPROTO_IPV6)
 506                                 continue;
 507
 508                         if (cmsg->cmsg_type == IPV6_HOPLIMIT)
 509                         {
 510                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 511                                                 sizeof (recv_ttl));
 512                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 513                         }
 514                         else
 515                         {
 516                                 dprintf ("Not handling option %i.\n",
 517                                                 cmsg->cmsg_type);
 518                         }
 519                 } /* }}} */
 520                 else
 521                 {
 522                         dprintf ("Don't know how to handle "
 523                                         "unknown protocol %i.\n",
 524                                         cmsg->cmsg_level);
 525                 }
 526         } /* }}} for (cmsg) */
 527
 528         if (ph->addrfamily == AF_INET)
 529         {
 530                 host = ping_receive_ipv4 (ph, payload_buffer, payload_buffer_len);
 531                 if (host == NULL)
 532                         return (-1);
 533         }
 534         else if (ph->addrfamily == AF_INET6)
 535         {
 536                 host = ping_receive_ipv6 (ph, payload_buffer, payload_buffer_len);
 537                 if (host == NULL)
 538                         return (-1);
 539         }
 540         else
 541         {
 542                 dprintf ("ping_receive_one: Unknown address family %i.\n",
 543                                 ph->addrfamily);
 544                 return (-1);
 545         }
 546
 547         dprintf ("rcvd: %12i.%06i\n",
 548                         (int) now->tv_sec,
 549                         (int) now->tv_usec);
 550         dprintf ("sent: %12i.%06i\n",
 551                         (int) host->timer->tv_sec,
 552                         (int) host->timer->tv_usec);
 553
 554         if (ping_timeval_sub (now, host->timer, &diff) < 0)
 555         {
 556                 timerclear (host->timer);
 557                 return (-1);
 558         }
 559
 560         dprintf ("diff: %12i.%06i\n",
 561                         (int) diff.tv_sec,
 562                         (int) diff.tv_usec);
 563
 564         if (recv_ttl >= 0)
 565                 host->recv_ttl = recv_ttl;
 566
 567         host->latency  = ((double) diff.tv_usec) / 1000.0;
 568         host->latency += ((double) diff.tv_sec)  * 1000.0;
 569
 570         timerclear (host->timer);
 571
 572         return (0);
 573 }
 574
 575 static int ping_receive_all (pingobj_t *obj)
 576 {
 577         fd_set readfds;
 578         int num_readfds;
 579         int max_readfds;
 580
 581         pinghost_t *ph;
 582         pinghost_t *ptr;
 583
 584         struct timeval endtime;
 585         struct timeval nowtime;
 586         struct timeval timeout;
 587         int status;
 588
 589         int ret;
 590
 591         ph = obj->head;
 592         ret = 0;
 593
 594         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 595                 ptr->latency = -1.0;
 596
 597         if (gettimeofday (&nowtime, NULL) == -1)
 598         {
 599                 ping_set_errno (obj, errno);
 600                 return (-1);
 601         }
 602
 603         /* Set up timeout */
 604         timeout.tv_sec = (time_t) obj->timeout;
 605         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 606
 607         dprintf ("Set timeout to %i.%06i seconds\n",
 608                         (int) timeout.tv_sec,
 609                         (int) timeout.tv_usec);
 610
 611         ping_timeval_add (&nowtime, &timeout, &endtime);
 612
 613         while (1)
 614         {
 615                 FD_ZERO (&readfds);
 616                 num_readfds =  0;
 617                 max_readfds = -1;
 618
 619                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 620                 {
 621                         if (!timerisset (ptr->timer))
 622                                 continue;
 623
 624                         FD_SET (ptr->fd, &readfds);
 625                         num_readfds++;
 626
 627                         if (max_readfds < ptr->fd)
 628                                 max_readfds = ptr->fd;
 629                 }
 630
 631                 if (num_readfds == 0)
 632                         break;
 633
 634                 if (gettimeofday (&nowtime, NULL) == -1)
 635                 {
 636                         ping_set_errno (obj, errno);
 637                         return (-1);
 638                 }
 639
 640                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 641                         break;
 642
 643                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_readfds,
 644                                 (int) timeout.tv_sec,
 645                                 (int) timeout.tv_usec);
 646
 647                 status = select (max_readfds + 1, &readfds, NULL, NULL, &timeout);
 648
 649                 if (gettimeofday (&nowtime, NULL) == -1)
 650                 {
 651                         ping_set_errno (obj, errno);
 652                         return (-1);
 653                 }
 654
 655                 if ((status == -1) && (errno == EINTR))
 656                 {
 657                         dprintf ("select was interrupted by signal..\n");
 658                         continue;
 659                 }
 660                 else if (status < 0)
 661                 {
 662 #if WITH_DEBUG
 663                         char errbuf[PING_ERRMSG_LEN];
 664                         dprintf ("select: %s\n",
 665                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 666 #endif
 667                         break;
 668                 }
 669                 else if (status == 0)
 670                 {
 671                         dprintf ("select timed out\n");
 672                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 673                                 if (ptr->latency < 0.0)
 674                                         ptr->dropped++;
 675                         break;
 676                 }
 677
 678                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 679                 {
 680                         if (FD_ISSET (ptr->fd, &readfds))
 681                                 if (ping_receive_one (ptr->fd, ph, &nowtime) == 0)
 682                                         ret++;
 683                 }
 684         } /* while (1) */
 685
 686         return (ret);
 687 }
 688
 689 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 690  * Sending functions:                                                        *
 691  *                                                                           *
 692  * ping_send_all                                                             *
 693  * +-> ping_send_one_ipv4                                                    *
 694  * `-> ping_send_one_ipv6                                                    *
 695  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 696 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 697                 const void *buf, size_t buflen)
 698 {
 699         ssize_t ret;
 700
 701         if (gettimeofday (ph->timer, NULL) == -1)
 702         {
 703                 timerclear (ph->timer);
 704                 return (-1);
 705         }
 706
 707         ret = sendto (ph->fd, buf, buflen, 0,
 708                         (struct sockaddr *) ph->addr, ph->addrlen);
 709
 710         if (ret < 0)
 711         {
 712 #if defined(EHOSTUNREACH)
 713                 if (errno == EHOSTUNREACH)
 714                         return (0);
 715 #endif
 716 #if defined(ENETUNREACH)
 717                 if (errno == ENETUNREACH)
 718                         return (0);
 719 #endif
 720                 ping_set_errno (obj, errno);
 721         }
 722
 723         return (ret);
 724 }
 725
 726 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 727 {
 728         struct icmp *icmp4;
 729         int status;
 730
 731         char buf[4096];
 732         int  buflen;
 733
 734         char *data;
 735         int   datalen;
 736
 737         dprintf ("ph->hostname = %s\n", ph->hostname);
 738
 739         memset (buf, '\0', sizeof (buf));
 740         icmp4 = (struct icmp *) buf;
 741         data  = (char *) (icmp4 + 1);
 742
 743         icmp4->icmp_type  = ICMP_ECHO;
 744         icmp4->icmp_code  = 0;
 745         icmp4->icmp_cksum = 0;
 746         icmp4->icmp_id    = htons (ph->ident);
 747         icmp4->icmp_seq   = htons (ph->sequence);
 748
 749         buflen = 4096 - sizeof (struct icmp);
 750         strncpy (data, ph->data, buflen);
 751         datalen = strlen (data);
 752
 753         buflen = datalen + sizeof (struct icmp);
 754
 755         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 756
 757         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 758
 759         status = ping_sendto (obj, ph, buf, buflen);
 760         if (status < 0)
 761         {
 762                 perror ("ping_sendto");
 763                 return (-1);
 764         }
 765
 766         dprintf ("sendto: status = %i\n", status);
 767
 768         return (0);
 769 }
 770
 771 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 772 {
 773         struct icmp6_hdr *icmp6;
 774         int status;
 775
 776         char buf[4096];
 777         int  buflen;
 778
 779         char *data;
 780         int   datalen;
 781
 782         dprintf ("ph->hostname = %s\n", ph->hostname);
 783
 784         memset (buf, '\0', sizeof (buf));
 785         icmp6 = (struct icmp6_hdr *) buf;
 786         data  = (char *) (icmp6 + 1);
 787
 788         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 789         icmp6->icmp6_code  = 0;
 790         /* The checksum will be calculated by the TCP/IP stack.  */
 791         /* FIXME */
 792         icmp6->icmp6_cksum = 0;
 793         icmp6->icmp6_id    = htons (ph->ident);
 794         icmp6->icmp6_seq   = htons (ph->sequence);
 795
 796         buflen = 4096 - sizeof (struct icmp6_hdr);
 797         strncpy (data, ph->data, buflen);
 798         datalen = strlen (data);
 799
 800         buflen = datalen + sizeof (struct icmp6_hdr);
 801
 802         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 803
 804         status = ping_sendto (obj, ph, buf, buflen);
 805         if (status < 0)
 806         {
 807                 perror ("ping_sendto");
 808                 return (-1);
 809         }
 810
 811         dprintf ("sendto: status = %i\n", status);
 812
 813         return (0);
 814 }
 815
 816 static int ping_send_all (pingobj_t *obj)
 817 {
 818         pinghost_t *ph;
 819         pinghost_t *ptr;
 820
 821         int ret;
 822
 823         ret = 0;
 824         ph = obj->head;
 825
 826         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 827         {
 828                 /* start timer.. The GNU `ping6' starts the timer before
 829                  * sending the packet, so I will do that too */
 830                 if (gettimeofday (ptr->timer, NULL) == -1)
 831                 {
 832 #if WITH_DEBUG
 833                         char errbuf[PING_ERRMSG_LEN];
 834                         dprintf ("gettimeofday: %s\n",
 835                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 836 #endif
 837                         timerclear (ptr->timer);
 838                         ret--;
 839                         continue;
 840                 }
 841                 else
 842                 {
 843                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 844                 }
 845
 846                 if (ptr->addrfamily == AF_INET6)
 847                 {
 848                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 849                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 850                         {
 851                                 timerclear (ptr->timer);
 852                                 ret--;
 853                                 continue;
 854                         }
 855                 }
 856                 else if (ptr->addrfamily == AF_INET)
 857                 {
 858                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 859                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 860                         {
 861                                 timerclear (ptr->timer);
 862                                 ret--;
 863                                 continue;
 864                         }
 865                 }
 866                 else /* this should not happen */
 867                 {
 868                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 869                         timerclear (ptr->timer);
 870                         ret--;
 871                         continue;
 872                 }
 873
 874                 ptr->sequence++;
 875         }
 876
 877         return (ret);
 878 }
 879
 880 /*
 881  * Set the TTL of a socket protocol independently.
 882  */
 883 static int ping_set_ttl (pinghost_t *ph, int ttl)
 884 {
 885         int ret = -2;
 886
 887         if (ph->addrfamily == AF_INET)
 888         {
 889                 dprintf ("Setting TTLv4 to %i\n", ttl);
 890                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL,
 891                                 &ttl, sizeof (ttl));
 892         }
 893         else if (ph->addrfamily == AF_INET6)
 894         {
 895                 dprintf ("Setting TTLv6 to %i\n", ttl);
 896                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
 897                                 &ttl, sizeof (ttl));
 898         }
 899
 900         return (ret);
 901 }
 902
 903 static int ping_get_ident (void)
 904 {
 905         int fd;
 906         static int did_seed = 0;
 907
 908         int retval;
 909
 910         if (did_seed == 0)
 911         {
 912                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 913                 {
 914                         unsigned int seed;
 915
 916                         if (read (fd, &seed, sizeof (seed)) != -1)
 917                         {
 918                                 did_seed = 1;
 919                                 dprintf ("Random seed:   %#x\n", seed);
 920                                 srandom (seed);
 921                         }
 922
 923                         close (fd);
 924                 }
 925 #if WITH_DEBUG
 926                 else
 927                 {
 928                         char errbuf[PING_ERRMSG_LEN];
 929                         dprintf ("open (/dev/urandom): %s\n",
 930                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 931                 }
 932 #endif
 933         }
 934
 935         retval = (int) random ();
 936
 937         dprintf ("Random number: %#x\n", retval);
 938
 939         return (retval);
 940 }
 941
 942 static pinghost_t *ping_alloc (void)
 943 {
 944         pinghost_t *ph;
 945         size_t      ph_size;
 946
 947         ph_size = sizeof (pinghost_t)
 948                 + sizeof (struct sockaddr_storage)
 949                 + sizeof (struct timeval);
 950
 951         ph = (pinghost_t *) malloc (ph_size);
 952         if (ph == NULL)
 953                 return (NULL);
 954
 955         memset (ph, '\0', ph_size);
 956
 957         ph->timer   = (struct timeval *) (ph + 1);
 958         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
 959
 960         ph->addrlen = sizeof (struct sockaddr_storage);
 961         ph->fd      = -1;
 962         ph->latency = -1.0;
 963         ph->dropped = 0;
 964         ph->ident   = ping_get_ident () & 0xFFFF;
 965
 966         return (ph);
 967 }
 968
 969 static void ping_free (pinghost_t *ph)
 970 {
 971         if (ph->fd >= 0)
 972                 close (ph->fd);
 973
 974         if (ph->username != NULL)
 975                 free (ph->username);
 976
 977         if (ph->hostname != NULL)
 978                 free (ph->hostname);
 979
 980         if (ph->data != NULL)
 981                 free (ph->data);
 982
 983         free (ph);
 984 }
 985
 986 /*
 987  * public methods
 988  */
 989 const char *ping_get_error (pingobj_t *obj)
 990 {
 991         return (obj->errmsg);
 992 }
 993
 994 pingobj_t *ping_construct (void)
 995 {
 996         pingobj_t *obj;
 997
 998         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
 999                 return (NULL);
1000         memset (obj, '\0', sizeof (pingobj_t));
1001
1002         obj->timeout    = PING_DEF_TIMEOUT;
1003         obj->ttl        = PING_DEF_TTL;
1004         obj->addrfamily = PING_DEF_AF;
1005         obj->data       = strdup (PING_DEF_DATA);
1006
1007         return (obj);
1008 }
1009
1010 void ping_destroy (pingobj_t *obj)
1011 {
1012         pinghost_t *current;
1013         pinghost_t *next;
1014
1015         current = obj->head;
1016         next = NULL;
1017
1018         while (current != NULL)
1019         {
1020                 next = current->next;
1021                 ping_free (current);
1022                 current = next;
1023         }
1024
1025         if (obj->data != NULL)
1026                 free (obj->data);
1027
1028         if (obj->srcaddr != NULL)
1029                 free (obj->srcaddr);
1030
1031         free (obj);
1032
1033         return;
1034 }
1035
1036 int ping_setopt (pingobj_t *obj, int option, void *value)
1037 {
1038         int ret = 0;
1039
1040         switch (option)
1041         {
1042                 case PING_OPT_TIMEOUT:
1043                         obj->timeout = *((double *) value);
1044                         if (obj->timeout < 0.0)
1045                         {
1046                                 obj->timeout = PING_DEF_TIMEOUT;
1047                                 ret = -1;
1048                         }
1049                         break;
1050
1051                 case PING_OPT_TTL:
1052                         obj->ttl = *((int *) value);
1053                         if ((obj->ttl < 1) || (obj->ttl > 255))
1054                         {
1055                                 obj->ttl = PING_DEF_TTL;
1056                                 ret = -1;
1057                         }
1058                         else
1059                         {
1060                                 pinghost_t *ph;
1061
1062                                 for (ph = obj->head; ph != NULL; ph = ph->next)
1063                                         ping_set_ttl (ph, obj->ttl);
1064                         }
1065                         break;
1066
1067                 case PING_OPT_AF:
1068                         obj->addrfamily = *((int *) value);
1069                         if ((obj->addrfamily != AF_UNSPEC)
1070                                         && (obj->addrfamily != AF_INET)
1071                                         && (obj->addrfamily != AF_INET6))
1072                         {
1073                                 obj->addrfamily = PING_DEF_AF;
1074                                 ret = -1;
1075                         }
1076                         if (obj->srcaddr != NULL)
1077                         {
1078                                 free (obj->srcaddr);
1079                                 obj->srcaddr = NULL;
1080                         }
1081                         break;
1082
1083                 case PING_OPT_DATA:
1084                         if (obj->data != NULL)
1085                         {
1086                                 free (obj->data);
1087                                 obj->data = NULL;
1088                         }
1089                         obj->data = strdup ((const char *) value);
1090                         break;
1091
1092                 case PING_OPT_SOURCE:
1093                 {
1094                         char            *hostname = (char *) value;
1095                         struct addrinfo  ai_hints;
1096                         struct addrinfo *ai_list;
1097                         int              status;
1098 #if WITH_DEBUG
1099                         if (obj->addrfamily != AF_UNSPEC)
1100                         {
1101                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1102                         }
1103 #endif
1104                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1105                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1106 #if defined(AI_ADDRCONFIG)
1107                         ai_hints.ai_flags = AI_ADDRCONFIG;
1108 #endif
1109                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1110                         if (status != 0)
1111                         {
1112 #if defined(EAI_SYSTEM)
1113                                 char errbuf[PING_ERRMSG_LEN];
1114 #endif
1115                                 ping_set_error (obj, "getaddrinfo",
1116 #if defined(EAI_SYSTEM)
1117                                                 (status == EAI_SYSTEM)
1118                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1119 #endif
1120                                                 gai_strerror (status));
1121                                 ret = -1;
1122                                 break;
1123                         }
1124 #if WITH_DEBUG
1125                         if (ai_list->ai_next != NULL)
1126                         {
1127                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1128                         }
1129 #endif
1130                         if (obj->srcaddr == NULL)
1131                         {
1132                                 obj->srcaddrlen = 0;
1133                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1134                                 if (obj->srcaddr == NULL)
1135                                 {
1136                                         ping_set_errno (obj, errno);
1137                                         ret = -1;
1138                                         freeaddrinfo (ai_list);
1139                                         break;
1140                                 }
1141                         }
1142                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1143                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1144                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1145                                         ai_list->ai_addrlen);
1146                         obj->srcaddrlen = ai_list->ai_addrlen;
1147                         obj->addrfamily = ai_list->ai_family;
1148
1149                         freeaddrinfo (ai_list);
1150                 } /* case PING_OPT_SOURCE */
1151                 break;
1152
1153                 default:
1154                         ret = -2;
1155         } /* switch (option) */
1156
1157         return (ret);
1158 } /* int ping_setopt */
1159
1160
1161 int ping_send (pingobj_t *obj)
1162 {
1163         int ret;
1164
1165         if (ping_send_all (obj) < 0)
1166                 return (-1);
1167
1168         if ((ret = ping_receive_all (obj)) < 0)
1169                 return (-2);
1170
1171         return (ret);
1172 }
1173
1174 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1175 {
1176         while (ph != NULL)
1177         {
1178                 if (strcasecmp (ph->username, host) == 0)
1179                         break;
1180
1181                 ph = ph->next;
1182         }
1183
1184         return (ph);
1185 }
1186
1187 int ping_host_add (pingobj_t *obj, const char *host)
1188 {
1189         pinghost_t *ph;
1190
1191         struct addrinfo  ai_hints;
1192         struct addrinfo *ai_list, *ai_ptr;
1193         int              ai_return;
1194
1195         dprintf ("host = %s\n", host);
1196
1197         if (ping_host_search (obj->head, host) != NULL)
1198                 return (0);
1199
1200         memset (&ai_hints, '\0', sizeof (ai_hints));
1201         ai_hints.ai_flags     = 0;
1202 #ifdef AI_ADDRCONFIG
1203         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1204 #endif
1205 #ifdef AI_CANONNAME
1206         ai_hints.ai_flags    |= AI_CANONNAME;
1207 #endif
1208         ai_hints.ai_family    = obj->addrfamily;
1209         ai_hints.ai_socktype  = SOCK_RAW;
1210
1211         if ((ph = ping_alloc ()) == NULL)
1212         {
1213                 dprintf ("Out of memory!\n");
1214                 return (-1);
1215         }
1216
1217         if ((ph->username = strdup (host)) == NULL)
1218         {
1219                 dprintf ("Out of memory!\n");
1220                 ping_set_errno (obj, errno);
1221                 ping_free (ph);
1222                 return (-1);
1223         }
1224
1225         if ((ph->hostname = strdup (host)) == NULL)
1226         {
1227                 dprintf ("Out of memory!\n");
1228                 ping_set_errno (obj, errno);
1229                 ping_free (ph);
1230                 return (-1);
1231         }
1232
1233         /* obj->data is not garuanteed to be != NULL */
1234         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1235         {
1236                 dprintf ("Out of memory!\n");
1237                 ping_set_errno (obj, errno);
1238                 ping_free (ph);
1239                 return (-1);
1240         }
1241
1242         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1243         {
1244 #if defined(EAI_SYSTEM)
1245                 char errbuf[PING_ERRMSG_LEN];
1246 #endif
1247                 dprintf ("getaddrinfo failed\n");
1248                 ping_set_error (obj, "getaddrinfo",
1249 #if defined(EAI_SYSTEM)
1250                                                 (ai_return == EAI_SYSTEM)
1251                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1252 #endif
1253                                 gai_strerror (ai_return));
1254                 ping_free (ph);
1255                 return (-1);
1256         }
1257
1258         if (ai_list == NULL)
1259                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1260
1261         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1262         {
1263                 ph->fd = -1;
1264
1265                 if (ai_ptr->ai_family == AF_INET)
1266                 {
1267                         ai_ptr->ai_socktype = SOCK_RAW;
1268                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1269                 }
1270                 else if (ai_ptr->ai_family == AF_INET6)
1271                 {
1272                         ai_ptr->ai_socktype = SOCK_RAW;
1273                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1274                 }
1275                 else
1276                 {
1277                         char errmsg[PING_ERRMSG_LEN];
1278
1279                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1280                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1281
1282                         dprintf (errmsg);
1283                         ping_set_error (obj, "getaddrinfo", errmsg);
1284                         continue;
1285                 }
1286
1287                 /* TODO: Move this to a static function `ping_open_socket' and
1288                  * call it whenever the socket dies. */
1289                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1290                 if (ph->fd == -1)
1291                 {
1292 #if WITH_DEBUG
1293                         char errbuf[PING_ERRMSG_LEN];
1294                         dprintf ("socket: %s\n",
1295                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1296 #endif
1297                         ping_set_errno (obj, errno);
1298                         continue;
1299                 }
1300
1301                 if (obj->srcaddr != NULL)
1302                 {
1303                         assert (obj->srcaddrlen > 0);
1304                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1305
1306                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1307                         {
1308 #if WITH_DEBUG
1309                                 char errbuf[PING_ERRMSG_LEN];
1310                                 dprintf ("bind: %s\n",
1311                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1312 #endif
1313                                 ping_set_errno (obj, errno);
1314                                 close (ph->fd);
1315                                 ph->fd = -1;
1316                                 continue;
1317                         }
1318                 }
1319
1320                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1321                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1322                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1323                 ph->addrlen = ai_ptr->ai_addrlen;
1324                 ph->addrfamily = ai_ptr->ai_family;
1325
1326 #ifdef AI_CANONNAME
1327                 if ((ai_ptr->ai_canonname != NULL)
1328                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1329                 {
1330                         char *old_hostname;
1331
1332                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1333                                         ph->hostname, ai_ptr->ai_canonname);
1334
1335                         old_hostname = ph->hostname;
1336                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1337                         {
1338                                 /* strdup failed, falling back to old hostname */
1339                                 ph->hostname = old_hostname;
1340                         }
1341                         else if (old_hostname != NULL)
1342                         {
1343                                 free (old_hostname);
1344                         }
1345                 }
1346 #endif /* AI_CANONNAME */
1347
1348                 if (ph->addrfamily == AF_INET)
1349                 {
1350                         int opt = 1;
1351
1352                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1353                                         &opt, sizeof (opt));
1354                 }
1355                 else if (ph->addrfamily == AF_INET6)
1356                 {
1357                         int opt = 1;
1358
1359                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1360                                         &opt, sizeof (opt));
1361                 }
1362
1363                 break;
1364         }
1365
1366         freeaddrinfo (ai_list);
1367
1368         if (ph->fd < 0)
1369         {
1370                 ping_free (ph);
1371                 return (-1);
1372         }
1373
1374         /*
1375          * Adding in the front is much easier, but then the iterator will
1376          * return the host that was added last as first host. That's just not
1377          * nice. -octo
1378          */
1379         if (obj->head == NULL)
1380         {
1381                 obj->head = ph;
1382         }
1383         else
1384         {
1385                 pinghost_t *hptr;
1386
1387                 hptr = obj->head;
1388                 while (hptr->next != NULL)
1389                         hptr = hptr->next;
1390
1391                 assert ((hptr != NULL) && (hptr->next == NULL));
1392                 hptr->next = ph;
1393         }
1394
1395         ping_set_ttl (ph, obj->ttl);
1396
1397         return (0);
1398 } /* int ping_host_add */
1399
1400 int ping_host_remove (pingobj_t *obj, const char *host)
1401 {
1402         pinghost_t *pre, *cur;
1403
1404         pre = NULL;
1405         cur = obj->head;
1406
1407         while (cur != NULL)
1408         {
1409                 if (strcasecmp (host, cur->username) == 0)
1410                         break;
1411
1412                 pre = cur;
1413                 cur = cur->next;
1414         }
1415
1416         if (cur == NULL)
1417         {
1418                 ping_set_error (obj, "ping_host_remove", "Host not found");
1419                 return (-1);
1420         }
1421
1422         if (pre == NULL)
1423                 obj->head = cur->next;
1424         else
1425                 pre->next = cur->next;
1426
1427         ping_free (cur);
1428
1429         return (0);
1430 }
1431
1432 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1433 {
1434         return ((pingobj_iter_t *) obj->head);
1435 }
1436
1437 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1438 {
1439         return ((pingobj_iter_t *) iter->next);
1440 }
1441
1442 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1443                 void *buffer, size_t *buffer_len)
1444 {
1445         int ret = EINVAL;
1446
1447         size_t orig_buffer_len = *buffer_len;
1448
1449         switch (info)
1450         {
1451                 case PING_INFO_USERNAME:
1452                         ret = ENOMEM;
1453                         *buffer_len = strlen (iter->username) + 1;
1454                         if (orig_buffer_len <= *buffer_len)
1455                                 break;
1456                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1457                          * will copy `*buffer_len' and pad the rest of
1458                          * `buffer' with null-bytes */
1459                         strncpy (buffer, iter->username, orig_buffer_len);
1460                         ret = 0;
1461                         break;
1462
1463                 case PING_INFO_HOSTNAME:
1464                         ret = ENOMEM;
1465                         *buffer_len = strlen (iter->hostname) + 1;
1466                         if (orig_buffer_len < *buffer_len)
1467                                 break;
1468                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1469                          * will copy `*buffer_len' and pad the rest of
1470                          * `buffer' with null-bytes */
1471                         strncpy (buffer, iter->hostname, orig_buffer_len);
1472                         ret = 0;
1473                         break;
1474
1475                 case PING_INFO_ADDRESS:
1476                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1477                                         iter->addrlen,
1478                                         (char *) buffer,
1479                                         *buffer_len,
1480                                         NULL, 0,
1481                                         NI_NUMERICHOST);
1482                         if (ret != 0)
1483                         {
1484                                 if ((ret == EAI_MEMORY)
1485 #ifdef EAI_OVERFLOW
1486                                                 || (ret == EAI_OVERFLOW)
1487 #endif
1488                                    )
1489                                         ret = ENOMEM;
1490 #if defined(EAI_SYSTEM)
1491                                 else if (ret == EAI_SYSTEM)
1492                                         ret = errno;
1493 #endif
1494                                 else
1495                                         ret = EINVAL;
1496                         }
1497                         break;
1498
1499                 case PING_INFO_FAMILY:
1500                         ret = ENOMEM;
1501                         *buffer_len = sizeof (int);
1502                         if (orig_buffer_len < sizeof (int))
1503                                 break;
1504                         *((int *) buffer) = iter->addrfamily;
1505                         ret = 0;
1506                         break;
1507
1508                 case PING_INFO_LATENCY:
1509                         ret = ENOMEM;
1510                         *buffer_len = sizeof (double);
1511                         if (orig_buffer_len < sizeof (double))
1512                                 break;
1513                         *((double *) buffer) = iter->latency;
1514                         ret = 0;
1515                         break;
1516
1517                 case PING_INFO_DROPPED:
1518                         ret = ENOMEM;
1519                         *buffer_len = sizeof (uint32_t);
1520                         if (orig_buffer_len < sizeof (uint32_t))
1521                                 break;
1522                         *((uint32_t *) buffer) = iter->dropped;
1523                         ret = 0;
1524                         break;
1525
1526                 case PING_INFO_SEQUENCE:
1527                         ret = ENOMEM;
1528                         *buffer_len = sizeof (unsigned int);
1529                         if (orig_buffer_len < sizeof (unsigned int))
1530                                 break;
1531                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1532                         ret = 0;
1533                         break;
1534
1535                 case PING_INFO_IDENT:
1536                         ret = ENOMEM;
1537                         *buffer_len = sizeof (uint16_t);
1538                         if (orig_buffer_len < sizeof (uint16_t))
1539                                 break;
1540                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1541                         ret = 0;
1542                         break;
1543
1544                 case PING_INFO_DATA:
1545                         ret = ENOMEM;
1546                         *buffer_len = strlen (iter->data);
1547                         if (orig_buffer_len < *buffer_len)
1548                                 break;
1549                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1550                         ret = 0;
1551                         break;
1552
1553                 case PING_INFO_RECV_TTL:
1554                         ret = ENOMEM;
1555                         *buffer_len = sizeof (int);
1556                         if (orig_buffer_len < sizeof (int))
1557                                 break;
1558                         *((int *) buffer) = iter->recv_ttl;
1559                         ret = 0;
1560                         break;
1561         }
1562
1563         return (ret);
1564 } /* ping_iterator_get_info */
1565
1566 void *ping_iterator_get_context (pingobj_iter_t *iter)
1567 {
1568         return (iter->context);
1569 }
1570
1571 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1572 {
1573         iter->context = context;
1574 }