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         ptr->recv_ttl = ip_hdr->ip_ttl;
 347
 348         return (ptr);
 349 }
 350
 351 #ifndef ICMP6_ECHO_REQUEST
 352 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
 353 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
 354 # else
 355 #  define ICMP6_ECHO_REQUEST 128
 356 # endif
 357 #endif
 358
 359 #ifndef ICMP6_ECHO_REPLY
 360 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
 361 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
 362 # else
 363 #  define ICMP6_ECHO_REPLY 129
 364 # endif
 365 #endif
 366
 367 static pinghost_t *ping_receive_ipv6 (pinghost_t *ph, char *buffer, size_t buffer_len)
 368 {
 369         struct icmp6_hdr *icmp_hdr;
 370
 371         uint16_t ident;
 372         uint16_t seq;
 373
 374         pinghost_t *ptr;
 375
 376         if (buffer_len < sizeof (struct icmp6_hdr))
 377                 return (NULL);
 378
 379         icmp_hdr = (struct icmp6_hdr *) buffer;
 380         buffer     += sizeof (struct icmp);
 381         buffer_len -= sizeof (struct icmp);
 382
 383         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 384         {
 385                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 386                 return (NULL);
 387         }
 388
 389         if (icmp_hdr->icmp6_code != 0)
 390         {
 391                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 392                 return (NULL);
 393         }
 394
 395         ident = ntohs (icmp_hdr->icmp6_id);
 396         seq   = ntohs (icmp_hdr->icmp6_seq);
 397
 398         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 399         {
 400                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 401                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 402
 403                 if (ptr->addrfamily != AF_INET6)
 404                         continue;
 405
 406                 if (!timerisset (ptr->timer))
 407                         continue;
 408
 409                 if (ptr->ident != ident)
 410                         continue;
 411
 412                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 413                         continue;
 414
 415                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
 416                                 ptr->hostname, ident, seq);
 417
 418                 break;
 419         }
 420
 421         if (ptr == NULL)
 422         {
 423                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
 424                                 ident, seq);
 425         }
 426
 427         return (ptr);
 428 }
 429
 430 static int ping_receive_one (int fd, pinghost_t *ph, struct timeval *now)
 431 {
 432         struct timeval diff;
 433         pinghost_t *host = NULL;
 434         int family;
 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         family = ph->addrfamily;
 481         recv_ttl = -1;
 482         for (cmsg = CMSG_FIRSTHDR (&msghdr); /* {{{ */
 483                         cmsg != NULL;
 484                         cmsg = CMSG_NXTHDR (&msghdr, cmsg))
 485         {
 486                 if (cmsg->cmsg_level == IPPROTO_IP) /* {{{ */
 487                 {
 488                         family = AF_INET;
 489                         if (cmsg->cmsg_type == IP_TTL)
 490                         {
 491                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 492                                                 sizeof (recv_ttl));
 493                                 dprintf ("TTLv4 = %i;\n", recv_ttl);
 494                         }
 495                         else
 496                         {
 497                                 dprintf ("Not handling option %i.\n",
 498                                                 cmsg->cmsg_type);
 499                         }
 500                 } /* }}} */
 501                 else if (cmsg->cmsg_level == IPPROTO_IPV6) /* {{{ */
 502                 {
 503                         family = AF_INET6;
 504                         if (cmsg->cmsg_type == IPV6_HOPLIMIT)
 505                         {
 506                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 507                                                 sizeof (recv_ttl));
 508                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 509                         }
 510                         else
 511                         {
 512                                 dprintf ("Not handling option %i.\n",
 513                                                 cmsg->cmsg_type);
 514                         }
 515                 } /* }}} */
 516                 else
 517                 {
 518                         dprintf ("Don't know how to handle "
 519                                         "unknown protocol %i.\n",
 520                                         cmsg->cmsg_level);
 521                 }
 522         } /* }}} for (cmsg) */
 523
 524         if (family == AF_INET)
 525         {
 526                 host = ping_receive_ipv4 (ph, payload_buffer, payload_buffer_len);
 527                 if (host == NULL)
 528                         return (-1);
 529         }
 530         else if (family == AF_INET6)
 531         {
 532                 host = ping_receive_ipv6 (ph, payload_buffer, payload_buffer_len);
 533                 if (host == NULL)
 534                         return (-1);
 535         }
 536         else
 537         {
 538                 dprintf ("ping_receive_one: Unknown address family %i.\n",
 539                                 family);
 540                 return (-1);
 541         }
 542
 543         dprintf ("rcvd: %12i.%06i\n",
 544                         (int) now->tv_sec,
 545                         (int) now->tv_usec);
 546         dprintf ("sent: %12i.%06i\n",
 547                         (int) host->timer->tv_sec,
 548                         (int) host->timer->tv_usec);
 549
 550         if (ping_timeval_sub (now, host->timer, &diff) < 0)
 551         {
 552                 timerclear (host->timer);
 553                 return (-1);
 554         }
 555
 556         dprintf ("diff: %12i.%06i\n",
 557                         (int) diff.tv_sec,
 558                         (int) diff.tv_usec);
 559
 560         if (recv_ttl >= 0)
 561                 host->recv_ttl = recv_ttl;
 562
 563         host->latency  = ((double) diff.tv_usec) / 1000.0;
 564         host->latency += ((double) diff.tv_sec)  * 1000.0;
 565
 566         timerclear (host->timer);
 567
 568         return (0);
 569 }
 570
 571 static int ping_receive_all (pingobj_t *obj)
 572 {
 573         fd_set readfds;
 574         int num_readfds;
 575         int max_readfds;
 576
 577         pinghost_t *ph;
 578         pinghost_t *ptr;
 579
 580         struct timeval endtime;
 581         struct timeval nowtime;
 582         struct timeval timeout;
 583         int status;
 584
 585         int ret;
 586
 587         ph = obj->head;
 588         ret = 0;
 589
 590         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 591                 ptr->latency = -1.0;
 592
 593         if (gettimeofday (&nowtime, NULL) == -1)
 594         {
 595                 ping_set_errno (obj, errno);
 596                 return (-1);
 597         }
 598
 599         /* Set up timeout */
 600         timeout.tv_sec = (time_t) obj->timeout;
 601         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 602
 603         dprintf ("Set timeout to %i.%06i seconds\n",
 604                         (int) timeout.tv_sec,
 605                         (int) timeout.tv_usec);
 606
 607         ping_timeval_add (&nowtime, &timeout, &endtime);
 608
 609         while (1)
 610         {
 611                 FD_ZERO (&readfds);
 612                 num_readfds =  0;
 613                 max_readfds = -1;
 614
 615                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 616                 {
 617                         if (!timerisset (ptr->timer))
 618                                 continue;
 619
 620                         FD_SET (ptr->fd, &readfds);
 621                         num_readfds++;
 622
 623                         if (max_readfds < ptr->fd)
 624                                 max_readfds = ptr->fd;
 625                 }
 626
 627                 if (num_readfds == 0)
 628                         break;
 629
 630                 if (gettimeofday (&nowtime, NULL) == -1)
 631                 {
 632                         ping_set_errno (obj, errno);
 633                         return (-1);
 634                 }
 635
 636                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 637                         break;
 638
 639                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_readfds,
 640                                 (int) timeout.tv_sec,
 641                                 (int) timeout.tv_usec);
 642
 643                 status = select (max_readfds + 1, &readfds, NULL, NULL, &timeout);
 644
 645                 if (gettimeofday (&nowtime, NULL) == -1)
 646                 {
 647                         ping_set_errno (obj, errno);
 648                         return (-1);
 649                 }
 650
 651                 if ((status == -1) && (errno == EINTR))
 652                 {
 653                         dprintf ("select was interrupted by signal..\n");
 654                         continue;
 655                 }
 656                 else if (status < 0)
 657                 {
 658 #if WITH_DEBUG
 659                         char errbuf[PING_ERRMSG_LEN];
 660                         dprintf ("select: %s\n",
 661                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 662 #endif
 663                         break;
 664                 }
 665                 else if (status == 0)
 666                 {
 667                         dprintf ("select timed out\n");
 668                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 669                                 if (ptr->latency < 0.0)
 670                                         ptr->dropped++;
 671                         break;
 672                 }
 673
 674                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 675                 {
 676                         if (FD_ISSET (ptr->fd, &readfds))
 677                                 if (ping_receive_one (ptr->fd, ph, &nowtime) == 0)
 678                                         ret++;
 679                 }
 680         } /* while (1) */
 681
 682         return (ret);
 683 }
 684
 685 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 686  * Sending functions:                                                        *
 687  *                                                                           *
 688  * ping_send_all                                                             *
 689  * +-> ping_send_one_ipv4                                                    *
 690  * `-> ping_send_one_ipv6                                                    *
 691  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 692 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 693                 const void *buf, size_t buflen)
 694 {
 695         ssize_t ret;
 696
 697         if (gettimeofday (ph->timer, NULL) == -1)
 698         {
 699                 timerclear (ph->timer);
 700                 return (-1);
 701         }
 702
 703         ret = sendto (ph->fd, buf, buflen, 0,
 704                         (struct sockaddr *) ph->addr, ph->addrlen);
 705
 706         if (ret < 0)
 707         {
 708 #if defined(EHOSTUNREACH)
 709                 if (errno == EHOSTUNREACH)
 710                         return (0);
 711 #endif
 712 #if defined(ENETUNREACH)
 713                 if (errno == ENETUNREACH)
 714                         return (0);
 715 #endif
 716                 ping_set_errno (obj, errno);
 717         }
 718
 719         return (ret);
 720 }
 721
 722 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 723 {
 724         struct icmp *icmp4;
 725         int status;
 726
 727         char buf[4096];
 728         int  buflen;
 729
 730         char *data;
 731         int   datalen;
 732
 733         dprintf ("ph->hostname = %s\n", ph->hostname);
 734
 735         memset (buf, '\0', sizeof (buf));
 736         icmp4 = (struct icmp *) buf;
 737         data  = (char *) (icmp4 + 1);
 738
 739         icmp4->icmp_type  = ICMP_ECHO;
 740         icmp4->icmp_code  = 0;
 741         icmp4->icmp_cksum = 0;
 742         icmp4->icmp_id    = htons (ph->ident);
 743         icmp4->icmp_seq   = htons (ph->sequence);
 744
 745         buflen = 4096 - sizeof (struct icmp);
 746         strncpy (data, ph->data, buflen);
 747         datalen = strlen (data);
 748
 749         buflen = datalen + sizeof (struct icmp);
 750
 751         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 752
 753         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 754
 755         status = ping_sendto (obj, ph, buf, buflen);
 756         if (status < 0)
 757         {
 758                 perror ("ping_sendto");
 759                 return (-1);
 760         }
 761
 762         dprintf ("sendto: status = %i\n", status);
 763
 764         return (0);
 765 }
 766
 767 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 768 {
 769         struct icmp6_hdr *icmp6;
 770         int status;
 771
 772         char buf[4096];
 773         int  buflen;
 774
 775         char *data;
 776         int   datalen;
 777
 778         dprintf ("ph->hostname = %s\n", ph->hostname);
 779
 780         memset (buf, '\0', sizeof (buf));
 781         icmp6 = (struct icmp6_hdr *) buf;
 782         data  = (char *) (icmp6 + 1);
 783
 784         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 785         icmp6->icmp6_code  = 0;
 786         /* The checksum will be calculated by the TCP/IP stack.  */
 787         /* FIXME */
 788         icmp6->icmp6_cksum = 0;
 789         icmp6->icmp6_id    = htons (ph->ident);
 790         icmp6->icmp6_seq   = htons (ph->sequence);
 791
 792         buflen = 4096 - sizeof (struct icmp6_hdr);
 793         strncpy (data, ph->data, buflen);
 794         datalen = strlen (data);
 795
 796         buflen = datalen + sizeof (struct icmp6_hdr);
 797
 798         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 799
 800         status = ping_sendto (obj, ph, buf, buflen);
 801         if (status < 0)
 802         {
 803                 perror ("ping_sendto");
 804                 return (-1);
 805         }
 806
 807         dprintf ("sendto: status = %i\n", status);
 808
 809         return (0);
 810 }
 811
 812 static int ping_send_all (pingobj_t *obj)
 813 {
 814         pinghost_t *ph;
 815         pinghost_t *ptr;
 816
 817         int ret;
 818
 819         ret = 0;
 820         ph = obj->head;
 821
 822         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 823         {
 824                 /* start timer.. The GNU `ping6' starts the timer before
 825                  * sending the packet, so I will do that too */
 826                 if (gettimeofday (ptr->timer, NULL) == -1)
 827                 {
 828 #if WITH_DEBUG
 829                         char errbuf[PING_ERRMSG_LEN];
 830                         dprintf ("gettimeofday: %s\n",
 831                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 832 #endif
 833                         timerclear (ptr->timer);
 834                         ret--;
 835                         continue;
 836                 }
 837                 else
 838                 {
 839                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 840                 }
 841
 842                 if (ptr->addrfamily == AF_INET6)
 843                 {
 844                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 845                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 846                         {
 847                                 timerclear (ptr->timer);
 848                                 ret--;
 849                                 continue;
 850                         }
 851                 }
 852                 else if (ptr->addrfamily == AF_INET)
 853                 {
 854                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 855                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 856                         {
 857                                 timerclear (ptr->timer);
 858                                 ret--;
 859                                 continue;
 860                         }
 861                 }
 862                 else /* this should not happen */
 863                 {
 864                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 865                         timerclear (ptr->timer);
 866                         ret--;
 867                         continue;
 868                 }
 869
 870                 ptr->sequence++;
 871         }
 872
 873         return (ret);
 874 }
 875
 876 /*
 877  * Set the TTL of a socket protocol independently.
 878  */
 879 static int ping_set_ttl (pinghost_t *ph, int ttl)
 880 {
 881         int ret = -2;
 882
 883         if (ph->addrfamily == AF_INET)
 884         {
 885                 dprintf ("Setting TTLv4 to %i\n", ttl);
 886                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL,
 887                                 &ttl, sizeof (ttl));
 888         }
 889         else if (ph->addrfamily == AF_INET6)
 890         {
 891                 dprintf ("Setting TTLv6 to %i\n", ttl);
 892                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
 893                                 &ttl, sizeof (ttl));
 894         }
 895
 896         return (ret);
 897 }
 898
 899 static int ping_get_ident (void)
 900 {
 901         int fd;
 902         static int did_seed = 0;
 903
 904         int retval;
 905
 906         if (did_seed == 0)
 907         {
 908                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 909                 {
 910                         unsigned int seed;
 911
 912                         if (read (fd, &seed, sizeof (seed)) != -1)
 913                         {
 914                                 did_seed = 1;
 915                                 dprintf ("Random seed:   %#x\n", seed);
 916                                 srandom (seed);
 917                         }
 918
 919                         close (fd);
 920                 }
 921 #if WITH_DEBUG
 922                 else
 923                 {
 924                         char errbuf[PING_ERRMSG_LEN];
 925                         dprintf ("open (/dev/urandom): %s\n",
 926                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 927                 }
 928 #endif
 929         }
 930
 931         retval = (int) random ();
 932
 933         dprintf ("Random number: %#x\n", retval);
 934
 935         return (retval);
 936 }
 937
 938 static pinghost_t *ping_alloc (void)
 939 {
 940         pinghost_t *ph;
 941         size_t      ph_size;
 942
 943         ph_size = sizeof (pinghost_t)
 944                 + sizeof (struct sockaddr_storage)
 945                 + sizeof (struct timeval);
 946
 947         ph = (pinghost_t *) malloc (ph_size);
 948         if (ph == NULL)
 949                 return (NULL);
 950
 951         memset (ph, '\0', ph_size);
 952
 953         ph->timer   = (struct timeval *) (ph + 1);
 954         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
 955
 956         ph->addrlen = sizeof (struct sockaddr_storage);
 957         ph->fd      = -1;
 958         ph->latency = -1.0;
 959         ph->dropped = 0;
 960         ph->ident   = ping_get_ident () & 0xFFFF;
 961
 962         return (ph);
 963 }
 964
 965 static void ping_free (pinghost_t *ph)
 966 {
 967         if (ph->fd >= 0)
 968                 close (ph->fd);
 969
 970         if (ph->username != NULL)
 971                 free (ph->username);
 972
 973         if (ph->hostname != NULL)
 974                 free (ph->hostname);
 975
 976         if (ph->data != NULL)
 977                 free (ph->data);
 978
 979         free (ph);
 980 }
 981
 982 /*
 983  * public methods
 984  */
 985 const char *ping_get_error (pingobj_t *obj)
 986 {
 987         return (obj->errmsg);
 988 }
 989
 990 pingobj_t *ping_construct (void)
 991 {
 992         pingobj_t *obj;
 993
 994         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
 995                 return (NULL);
 996         memset (obj, '\0', sizeof (pingobj_t));
 997
 998         obj->timeout    = PING_DEF_TIMEOUT;
 999         obj->ttl        = PING_DEF_TTL;
1000         obj->addrfamily = PING_DEF_AF;
1001         obj->data       = strdup (PING_DEF_DATA);
1002
1003         return (obj);
1004 }
1005
1006 void ping_destroy (pingobj_t *obj)
1007 {
1008         pinghost_t *current;
1009         pinghost_t *next;
1010
1011         current = obj->head;
1012         next = NULL;
1013
1014         while (current != NULL)
1015         {
1016                 next = current->next;
1017                 ping_free (current);
1018                 current = next;
1019         }
1020
1021         if (obj->data != NULL)
1022                 free (obj->data);
1023
1024         if (obj->srcaddr != NULL)
1025                 free (obj->srcaddr);
1026
1027         free (obj);
1028
1029         return;
1030 }
1031
1032 int ping_setopt (pingobj_t *obj, int option, void *value)
1033 {
1034         int ret = 0;
1035
1036         switch (option)
1037         {
1038                 case PING_OPT_TIMEOUT:
1039                         obj->timeout = *((double *) value);
1040                         if (obj->timeout < 0.0)
1041                         {
1042                                 obj->timeout = PING_DEF_TIMEOUT;
1043                                 ret = -1;
1044                         }
1045                         break;
1046
1047                 case PING_OPT_TTL:
1048                         obj->ttl = *((int *) value);
1049                         if ((obj->ttl < 1) || (obj->ttl > 255))
1050                         {
1051                                 obj->ttl = PING_DEF_TTL;
1052                                 ret = -1;
1053                         }
1054                         else
1055                         {
1056                                 pinghost_t *ph;
1057
1058                                 for (ph = obj->head; ph != NULL; ph = ph->next)
1059                                         ping_set_ttl (ph, obj->ttl);
1060                         }
1061                         break;
1062
1063                 case PING_OPT_AF:
1064                         obj->addrfamily = *((int *) value);
1065                         if ((obj->addrfamily != AF_UNSPEC)
1066                                         && (obj->addrfamily != AF_INET)
1067                                         && (obj->addrfamily != AF_INET6))
1068                         {
1069                                 obj->addrfamily = PING_DEF_AF;
1070                                 ret = -1;
1071                         }
1072                         if (obj->srcaddr != NULL)
1073                         {
1074                                 free (obj->srcaddr);
1075                                 obj->srcaddr = NULL;
1076                         }
1077                         break;
1078
1079                 case PING_OPT_DATA:
1080                         if (obj->data != NULL)
1081                         {
1082                                 free (obj->data);
1083                                 obj->data = NULL;
1084                         }
1085                         obj->data = strdup ((const char *) value);
1086                         break;
1087
1088                 case PING_OPT_SOURCE:
1089                 {
1090                         char            *hostname = (char *) value;
1091                         struct addrinfo  ai_hints;
1092                         struct addrinfo *ai_list;
1093                         int              status;
1094 #if WITH_DEBUG
1095                         if (obj->addrfamily != AF_UNSPEC)
1096                         {
1097                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1098                         }
1099 #endif
1100                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1101                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1102 #if defined(AI_ADDRCONFIG)
1103                         ai_hints.ai_flags = AI_ADDRCONFIG;
1104 #endif
1105                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1106                         if (status != 0)
1107                         {
1108 #if defined(EAI_SYSTEM)
1109                                 char errbuf[PING_ERRMSG_LEN];
1110 #endif
1111                                 ping_set_error (obj, "getaddrinfo",
1112 #if defined(EAI_SYSTEM)
1113                                                 (status == EAI_SYSTEM)
1114                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1115 #endif
1116                                                 gai_strerror (status));
1117                                 ret = -1;
1118                                 break;
1119                         }
1120 #if WITH_DEBUG
1121                         if (ai_list->ai_next != NULL)
1122                         {
1123                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1124                         }
1125 #endif
1126                         if (obj->srcaddr == NULL)
1127                         {
1128                                 obj->srcaddrlen = 0;
1129                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1130                                 if (obj->srcaddr == NULL)
1131                                 {
1132                                         ping_set_errno (obj, errno);
1133                                         ret = -1;
1134                                         freeaddrinfo (ai_list);
1135                                         break;
1136                                 }
1137                         }
1138                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1139                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1140                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1141                                         ai_list->ai_addrlen);
1142                         obj->srcaddrlen = ai_list->ai_addrlen;
1143                         obj->addrfamily = ai_list->ai_family;
1144
1145                         freeaddrinfo (ai_list);
1146                 } /* case PING_OPT_SOURCE */
1147                 break;
1148
1149                 default:
1150                         ret = -2;
1151         } /* switch (option) */
1152
1153         return (ret);
1154 } /* int ping_setopt */
1155
1156
1157 int ping_send (pingobj_t *obj)
1158 {
1159         int ret;
1160
1161         if (ping_send_all (obj) < 0)
1162                 return (-1);
1163
1164         if ((ret = ping_receive_all (obj)) < 0)
1165                 return (-2);
1166
1167         return (ret);
1168 }
1169
1170 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1171 {
1172         while (ph != NULL)
1173         {
1174                 if (strcasecmp (ph->username, host) == 0)
1175                         break;
1176
1177                 ph = ph->next;
1178         }
1179
1180         return (ph);
1181 }
1182
1183 int ping_host_add (pingobj_t *obj, const char *host)
1184 {
1185         pinghost_t *ph;
1186
1187         struct addrinfo  ai_hints;
1188         struct addrinfo *ai_list, *ai_ptr;
1189         int              ai_return;
1190
1191         dprintf ("host = %s\n", host);
1192
1193         if (ping_host_search (obj->head, host) != NULL)
1194                 return (0);
1195
1196         memset (&ai_hints, '\0', sizeof (ai_hints));
1197         ai_hints.ai_flags     = 0;
1198 #ifdef AI_ADDRCONFIG
1199         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1200 #endif
1201 #ifdef AI_CANONNAME
1202         ai_hints.ai_flags    |= AI_CANONNAME;
1203 #endif
1204         ai_hints.ai_family    = obj->addrfamily;
1205         ai_hints.ai_socktype  = SOCK_RAW;
1206
1207         if ((ph = ping_alloc ()) == NULL)
1208         {
1209                 dprintf ("Out of memory!\n");
1210                 return (-1);
1211         }
1212
1213         if ((ph->username = strdup (host)) == NULL)
1214         {
1215                 dprintf ("Out of memory!\n");
1216                 ping_set_errno (obj, errno);
1217                 ping_free (ph);
1218                 return (-1);
1219         }
1220
1221         if ((ph->hostname = strdup (host)) == NULL)
1222         {
1223                 dprintf ("Out of memory!\n");
1224                 ping_set_errno (obj, errno);
1225                 ping_free (ph);
1226                 return (-1);
1227         }
1228
1229         /* obj->data is not garuanteed to be != NULL */
1230         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1231         {
1232                 dprintf ("Out of memory!\n");
1233                 ping_set_errno (obj, errno);
1234                 ping_free (ph);
1235                 return (-1);
1236         }
1237
1238         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1239         {
1240 #if defined(EAI_SYSTEM)
1241                 char errbuf[PING_ERRMSG_LEN];
1242 #endif
1243                 dprintf ("getaddrinfo failed\n");
1244                 ping_set_error (obj, "getaddrinfo",
1245 #if defined(EAI_SYSTEM)
1246                                                 (ai_return == EAI_SYSTEM)
1247                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1248 #endif
1249                                 gai_strerror (ai_return));
1250                 ping_free (ph);
1251                 return (-1);
1252         }
1253
1254         if (ai_list == NULL)
1255                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1256
1257         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1258         {
1259                 ph->fd = -1;
1260
1261                 if (ai_ptr->ai_family == AF_INET)
1262                 {
1263                         ai_ptr->ai_socktype = SOCK_RAW;
1264                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1265                 }
1266                 else if (ai_ptr->ai_family == AF_INET6)
1267                 {
1268                         ai_ptr->ai_socktype = SOCK_RAW;
1269                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1270                 }
1271                 else
1272                 {
1273                         char errmsg[PING_ERRMSG_LEN];
1274
1275                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1276                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1277
1278                         dprintf (errmsg);
1279                         ping_set_error (obj, "getaddrinfo", errmsg);
1280                         continue;
1281                 }
1282
1283                 /* TODO: Move this to a static function `ping_open_socket' and
1284                  * call it whenever the socket dies. */
1285                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1286                 if (ph->fd == -1)
1287                 {
1288 #if WITH_DEBUG
1289                         char errbuf[PING_ERRMSG_LEN];
1290                         dprintf ("socket: %s\n",
1291                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1292 #endif
1293                         ping_set_errno (obj, errno);
1294                         continue;
1295                 }
1296
1297                 if (obj->srcaddr != NULL)
1298                 {
1299                         assert (obj->srcaddrlen > 0);
1300                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1301
1302                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1303                         {
1304 #if WITH_DEBUG
1305                                 char errbuf[PING_ERRMSG_LEN];
1306                                 dprintf ("bind: %s\n",
1307                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1308 #endif
1309                                 ping_set_errno (obj, errno);
1310                                 close (ph->fd);
1311                                 ph->fd = -1;
1312                                 continue;
1313                         }
1314                 }
1315
1316                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1317                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1318                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1319                 ph->addrlen = ai_ptr->ai_addrlen;
1320                 ph->addrfamily = ai_ptr->ai_family;
1321
1322 #ifdef AI_CANONNAME
1323                 if ((ai_ptr->ai_canonname != NULL)
1324                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1325                 {
1326                         char *old_hostname;
1327
1328                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1329                                         ph->hostname, ai_ptr->ai_canonname);
1330
1331                         old_hostname = ph->hostname;
1332                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1333                         {
1334                                 /* strdup failed, falling back to old hostname */
1335                                 ph->hostname = old_hostname;
1336                         }
1337                         else if (old_hostname != NULL)
1338                         {
1339                                 free (old_hostname);
1340                         }
1341                 }
1342 #endif /* AI_CANONNAME */
1343
1344                 if (ph->addrfamily == AF_INET)
1345                 {
1346                         int opt = 1;
1347
1348                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1349                                         &opt, sizeof (opt));
1350                 }
1351                 else if (ph->addrfamily == AF_INET6)
1352                 {
1353                         int opt = 1;
1354
1355                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1356                                         &opt, sizeof (opt));
1357                 }
1358
1359                 break;
1360         }
1361
1362         freeaddrinfo (ai_list);
1363
1364         if (ph->fd < 0)
1365         {
1366                 ping_free (ph);
1367                 return (-1);
1368         }
1369
1370         /*
1371          * Adding in the front is much easier, but then the iterator will
1372          * return the host that was added last as first host. That's just not
1373          * nice. -octo
1374          */
1375         if (obj->head == NULL)
1376         {
1377                 obj->head = ph;
1378         }
1379         else
1380         {
1381                 pinghost_t *hptr;
1382
1383                 hptr = obj->head;
1384                 while (hptr->next != NULL)
1385                         hptr = hptr->next;
1386
1387                 assert ((hptr != NULL) && (hptr->next == NULL));
1388                 hptr->next = ph;
1389         }
1390
1391         ping_set_ttl (ph, obj->ttl);
1392
1393         return (0);
1394 } /* int ping_host_add */
1395
1396 int ping_host_remove (pingobj_t *obj, const char *host)
1397 {
1398         pinghost_t *pre, *cur;
1399
1400         pre = NULL;
1401         cur = obj->head;
1402
1403         while (cur != NULL)
1404         {
1405                 if (strcasecmp (host, cur->username) == 0)
1406                         break;
1407
1408                 pre = cur;
1409                 cur = cur->next;
1410         }
1411
1412         if (cur == NULL)
1413         {
1414                 ping_set_error (obj, "ping_host_remove", "Host not found");
1415                 return (-1);
1416         }
1417
1418         if (pre == NULL)
1419                 obj->head = cur->next;
1420         else
1421                 pre->next = cur->next;
1422
1423         ping_free (cur);
1424
1425         return (0);
1426 }
1427
1428 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1429 {
1430         return ((pingobj_iter_t *) obj->head);
1431 }
1432
1433 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1434 {
1435         return ((pingobj_iter_t *) iter->next);
1436 }
1437
1438 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1439                 void *buffer, size_t *buffer_len)
1440 {
1441         int ret = EINVAL;
1442
1443         size_t orig_buffer_len = *buffer_len;
1444
1445         switch (info)
1446         {
1447                 case PING_INFO_USERNAME:
1448                         ret = ENOMEM;
1449                         *buffer_len = strlen (iter->username) + 1;
1450                         if (orig_buffer_len <= *buffer_len)
1451                                 break;
1452                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1453                          * will copy `*buffer_len' and pad the rest of
1454                          * `buffer' with null-bytes */
1455                         strncpy (buffer, iter->username, orig_buffer_len);
1456                         ret = 0;
1457                         break;
1458
1459                 case PING_INFO_HOSTNAME:
1460                         ret = ENOMEM;
1461                         *buffer_len = strlen (iter->hostname) + 1;
1462                         if (orig_buffer_len < *buffer_len)
1463                                 break;
1464                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1465                          * will copy `*buffer_len' and pad the rest of
1466                          * `buffer' with null-bytes */
1467                         strncpy (buffer, iter->hostname, orig_buffer_len);
1468                         ret = 0;
1469                         break;
1470
1471                 case PING_INFO_ADDRESS:
1472                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1473                                         iter->addrlen,
1474                                         (char *) buffer,
1475                                         *buffer_len,
1476                                         NULL, 0,
1477                                         NI_NUMERICHOST);
1478                         if (ret != 0)
1479                         {
1480                                 if ((ret == EAI_MEMORY)
1481 #ifdef EAI_OVERFLOW
1482                                                 || (ret == EAI_OVERFLOW)
1483 #endif
1484                                    )
1485                                         ret = ENOMEM;
1486 #if defined(EAI_SYSTEM)
1487                                 else if (ret == EAI_SYSTEM)
1488                                         ret = errno;
1489 #endif
1490                                 else
1491                                         ret = EINVAL;
1492                         }
1493                         break;
1494
1495                 case PING_INFO_FAMILY:
1496                         ret = ENOMEM;
1497                         *buffer_len = sizeof (int);
1498                         if (orig_buffer_len < sizeof (int))
1499                                 break;
1500                         *((int *) buffer) = iter->addrfamily;
1501                         ret = 0;
1502                         break;
1503
1504                 case PING_INFO_LATENCY:
1505                         ret = ENOMEM;
1506                         *buffer_len = sizeof (double);
1507                         if (orig_buffer_len < sizeof (double))
1508                                 break;
1509                         *((double *) buffer) = iter->latency;
1510                         ret = 0;
1511                         break;
1512
1513                 case PING_INFO_DROPPED:
1514                         ret = ENOMEM;
1515                         *buffer_len = sizeof (uint32_t);
1516                         if (orig_buffer_len < sizeof (uint32_t))
1517                                 break;
1518                         *((uint32_t *) buffer) = iter->dropped;
1519                         ret = 0;
1520                         break;
1521
1522                 case PING_INFO_SEQUENCE:
1523                         ret = ENOMEM;
1524                         *buffer_len = sizeof (unsigned int);
1525                         if (orig_buffer_len < sizeof (unsigned int))
1526                                 break;
1527                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1528                         ret = 0;
1529                         break;
1530
1531                 case PING_INFO_IDENT:
1532                         ret = ENOMEM;
1533                         *buffer_len = sizeof (uint16_t);
1534                         if (orig_buffer_len < sizeof (uint16_t))
1535                                 break;
1536                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1537                         ret = 0;
1538                         break;
1539
1540                 case PING_INFO_DATA:
1541                         ret = ENOMEM;
1542                         *buffer_len = strlen (iter->data);
1543                         if (orig_buffer_len < *buffer_len)
1544                                 break;
1545                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1546                         ret = 0;
1547                         break;
1548
1549                 case PING_INFO_RECV_TTL:
1550                         ret = ENOMEM;
1551                         *buffer_len = sizeof (int);
1552                         if (orig_buffer_len < sizeof (int))
1553                                 break;
1554                         *((int *) buffer) = iter->recv_ttl;
1555                         ret = 0;
1556                         break;
1557         }
1558
1559         return (ret);
1560 } /* ping_iterator_get_info */
1561
1562 void *ping_iterator_get_context (pingobj_iter_t *iter)
1563 {
1564         return (iter->context);
1565 }
1566
1567 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1568 {
1569         iter->context = context;
1570 }