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 static 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         for (cmsg = CMSG_FIRSTHDR (&msghdr); /* {{{ */
 482                         cmsg != NULL;
 483                         cmsg = CMSG_NXTHDR (&msghdr, cmsg))
 484         {
 485                 if (ph->addrfamily == AF_INET) /* {{{ */
 486                 {
 487                         if (cmsg->cmsg_level != IPPROTO_IP)
 488                                 continue;
 489
 490                         if (cmsg->cmsg_type == IP_TTL)
 491                         {
 492                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 493                                                 sizeof (recv_ttl));
 494                                 dprintf ("TTLv4 = %i;\n", recv_ttl);
 495                         }
 496                         else
 497                         {
 498                                 dprintf ("Not handling option %i.\n",
 499                                                 cmsg->cmsg_type);
 500                         }
 501                 } /* }}} */
 502                 else if (ph->addrfamily == AF_INET6) /* {{{ */
 503                 {
 504                         if (cmsg->cmsg_level != IPPROTO_IPV6)
 505                                 continue;
 506
 507                         if (cmsg->cmsg_type == IPV6_HOPLIMIT)
 508                         {
 509                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 510                                                 sizeof (recv_ttl));
 511                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 512                         }
 513                         else
 514                         {
 515                                 dprintf ("Not handling option %i.\n",
 516                                                 cmsg->cmsg_type);
 517                         }
 518                 } /* }}} */
 519                 else
 520                 {
 521                         dprintf ("Don't know how to handle "
 522                                         "unknown protocol %i.\n",
 523                                         cmsg->cmsg_level);
 524                 }
 525         } /* }}} for (cmsg) */
 526
 527         if (ph->addrfamily == AF_INET)
 528         {
 529                 host = ping_receive_ipv4 (ph, payload_buffer, payload_buffer_len);
 530                 if (host == NULL)
 531                         return (-1);
 532         }
 533         else if (ph->addrfamily == AF_INET6)
 534         {
 535                 host = ping_receive_ipv6 (ph, payload_buffer, payload_buffer_len);
 536                 if (host == NULL)
 537                         return (-1);
 538         }
 539         else
 540         {
 541                 dprintf ("ping_receive_one: Unknown address family %i.\n",
 542                                 ph->addrfamily);
 543                 return (-1);
 544         }
 545
 546         dprintf ("rcvd: %12i.%06i\n",
 547                         (int) now->tv_sec,
 548                         (int) now->tv_usec);
 549         dprintf ("sent: %12i.%06i\n",
 550                         (int) host->timer->tv_sec,
 551                         (int) host->timer->tv_usec);
 552
 553         if (ping_timeval_sub (now, host->timer, &diff) < 0)
 554         {
 555                 timerclear (host->timer);
 556                 return (-1);
 557         }
 558
 559         dprintf ("diff: %12i.%06i\n",
 560                         (int) diff.tv_sec,
 561                         (int) diff.tv_usec);
 562
 563         if (recv_ttl >= 0)
 564                 host->recv_ttl = recv_ttl;
 565
 566         host->latency  = ((double) diff.tv_usec) / 1000.0;
 567         host->latency += ((double) diff.tv_sec)  * 1000.0;
 568
 569         timerclear (host->timer);
 570
 571         return (0);
 572 }
 573
 574 static int ping_receive_all (pingobj_t *obj)
 575 {
 576         fd_set readfds;
 577         int num_readfds;
 578         int max_readfds;
 579
 580         pinghost_t *ph;
 581         pinghost_t *ptr;
 582
 583         struct timeval endtime;
 584         struct timeval nowtime;
 585         struct timeval timeout;
 586         int status;
 587
 588         int ret;
 589
 590         ph = obj->head;
 591         ret = 0;
 592
 593         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 594         {
 595                 ptr->latency  = -1.0;
 596                 ptr->recv_ttl = -1;
 597         }
 598
 599         if (gettimeofday (&nowtime, NULL) == -1)
 600         {
 601                 ping_set_errno (obj, errno);
 602                 return (-1);
 603         }
 604
 605         /* Set up timeout */
 606         timeout.tv_sec = (time_t) obj->timeout;
 607         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 608
 609         dprintf ("Set timeout to %i.%06i seconds\n",
 610                         (int) timeout.tv_sec,
 611                         (int) timeout.tv_usec);
 612
 613         ping_timeval_add (&nowtime, &timeout, &endtime);
 614
 615         while (1)
 616         {
 617                 FD_ZERO (&readfds);
 618                 num_readfds =  0;
 619                 max_readfds = -1;
 620
 621                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 622                 {
 623                         if (!timerisset (ptr->timer))
 624                                 continue;
 625
 626                         FD_SET (ptr->fd, &readfds);
 627                         num_readfds++;
 628
 629                         if (max_readfds < ptr->fd)
 630                                 max_readfds = ptr->fd;
 631                 }
 632
 633                 if (num_readfds == 0)
 634                         break;
 635
 636                 if (gettimeofday (&nowtime, NULL) == -1)
 637                 {
 638                         ping_set_errno (obj, errno);
 639                         return (-1);
 640                 }
 641
 642                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 643                         break;
 644
 645                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_readfds,
 646                                 (int) timeout.tv_sec,
 647                                 (int) timeout.tv_usec);
 648
 649                 status = select (max_readfds + 1, &readfds, NULL, NULL, &timeout);
 650
 651                 if (gettimeofday (&nowtime, NULL) == -1)
 652                 {
 653                         ping_set_errno (obj, errno);
 654                         return (-1);
 655                 }
 656
 657                 if ((status == -1) && (errno == EINTR))
 658                 {
 659                         dprintf ("select was interrupted by signal..\n");
 660                         continue;
 661                 }
 662                 else if (status < 0)
 663                 {
 664 #if WITH_DEBUG
 665                         char errbuf[PING_ERRMSG_LEN];
 666                         dprintf ("select: %s\n",
 667                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 668 #endif
 669                         break;
 670                 }
 671                 else if (status == 0)
 672                 {
 673                         dprintf ("select timed out\n");
 674                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 675                                 if (ptr->latency < 0.0)
 676                                         ptr->dropped++;
 677                         break;
 678                 }
 679
 680                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 681                 {
 682                         if (FD_ISSET (ptr->fd, &readfds))
 683                                 if (ping_receive_one (ptr->fd, ph, &nowtime) == 0)
 684                                         ret++;
 685                 }
 686         } /* while (1) */
 687
 688         return (ret);
 689 }
 690
 691 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 692  * Sending functions:                                                        *
 693  *                                                                           *
 694  * ping_send_all                                                             *
 695  * +-> ping_send_one_ipv4                                                    *
 696  * `-> ping_send_one_ipv6                                                    *
 697  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 698 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 699                 const void *buf, size_t buflen)
 700 {
 701         ssize_t ret;
 702
 703         if (gettimeofday (ph->timer, NULL) == -1)
 704         {
 705                 timerclear (ph->timer);
 706                 return (-1);
 707         }
 708
 709         ret = sendto (ph->fd, buf, buflen, 0,
 710                         (struct sockaddr *) ph->addr, ph->addrlen);
 711
 712         if (ret < 0)
 713         {
 714 #if defined(EHOSTUNREACH)
 715                 if (errno == EHOSTUNREACH)
 716                         return (0);
 717 #endif
 718 #if defined(ENETUNREACH)
 719                 if (errno == ENETUNREACH)
 720                         return (0);
 721 #endif
 722                 ping_set_errno (obj, errno);
 723         }
 724
 725         return (ret);
 726 }
 727
 728 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 729 {
 730         struct icmp *icmp4;
 731         int status;
 732
 733         char buf[4096];
 734         int  buflen;
 735
 736         char *data;
 737         int   datalen;
 738
 739         dprintf ("ph->hostname = %s\n", ph->hostname);
 740
 741         memset (buf, '\0', sizeof (buf));
 742         icmp4 = (struct icmp *) buf;
 743         data  = (char *) (icmp4 + 1);
 744
 745         icmp4->icmp_type  = ICMP_ECHO;
 746         icmp4->icmp_code  = 0;
 747         icmp4->icmp_cksum = 0;
 748         icmp4->icmp_id    = htons (ph->ident);
 749         icmp4->icmp_seq   = htons (ph->sequence);
 750
 751         buflen = 4096 - sizeof (struct icmp);
 752         strncpy (data, ph->data, buflen);
 753         datalen = strlen (data);
 754
 755         buflen = datalen + sizeof (struct icmp);
 756
 757         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 758
 759         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 760
 761         status = ping_sendto (obj, ph, buf, buflen);
 762         if (status < 0)
 763         {
 764                 perror ("ping_sendto");
 765                 return (-1);
 766         }
 767
 768         dprintf ("sendto: status = %i\n", status);
 769
 770         return (0);
 771 }
 772
 773 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 774 {
 775         struct icmp6_hdr *icmp6;
 776         int status;
 777
 778         char buf[4096];
 779         int  buflen;
 780
 781         char *data;
 782         int   datalen;
 783
 784         dprintf ("ph->hostname = %s\n", ph->hostname);
 785
 786         memset (buf, '\0', sizeof (buf));
 787         icmp6 = (struct icmp6_hdr *) buf;
 788         data  = (char *) (icmp6 + 1);
 789
 790         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 791         icmp6->icmp6_code  = 0;
 792         /* The checksum will be calculated by the TCP/IP stack.  */
 793         /* FIXME */
 794         icmp6->icmp6_cksum = 0;
 795         icmp6->icmp6_id    = htons (ph->ident);
 796         icmp6->icmp6_seq   = htons (ph->sequence);
 797
 798         buflen = 4096 - sizeof (struct icmp6_hdr);
 799         strncpy (data, ph->data, buflen);
 800         datalen = strlen (data);
 801
 802         buflen = datalen + sizeof (struct icmp6_hdr);
 803
 804         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 805
 806         status = ping_sendto (obj, ph, buf, buflen);
 807         if (status < 0)
 808         {
 809                 perror ("ping_sendto");
 810                 return (-1);
 811         }
 812
 813         dprintf ("sendto: status = %i\n", status);
 814
 815         return (0);
 816 }
 817
 818 static int ping_send_all (pingobj_t *obj)
 819 {
 820         pinghost_t *ph;
 821         pinghost_t *ptr;
 822
 823         int ret;
 824
 825         ret = 0;
 826         ph = obj->head;
 827
 828         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 829         {
 830                 /* start timer.. The GNU `ping6' starts the timer before
 831                  * sending the packet, so I will do that too */
 832                 if (gettimeofday (ptr->timer, NULL) == -1)
 833                 {
 834 #if WITH_DEBUG
 835                         char errbuf[PING_ERRMSG_LEN];
 836                         dprintf ("gettimeofday: %s\n",
 837                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 838 #endif
 839                         timerclear (ptr->timer);
 840                         ret--;
 841                         continue;
 842                 }
 843                 else
 844                 {
 845                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 846                 }
 847
 848                 if (ptr->addrfamily == AF_INET6)
 849                 {
 850                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 851                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 852                         {
 853                                 timerclear (ptr->timer);
 854                                 ret--;
 855                                 continue;
 856                         }
 857                 }
 858                 else if (ptr->addrfamily == AF_INET)
 859                 {
 860                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 861                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 862                         {
 863                                 timerclear (ptr->timer);
 864                                 ret--;
 865                                 continue;
 866                         }
 867                 }
 868                 else /* this should not happen */
 869                 {
 870                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 871                         timerclear (ptr->timer);
 872                         ret--;
 873                         continue;
 874                 }
 875
 876                 ptr->sequence++;
 877         }
 878
 879         return (ret);
 880 }
 881
 882 /*
 883  * Set the TTL of a socket protocol independently.
 884  */
 885 static int ping_set_ttl (pinghost_t *ph, int ttl)
 886 {
 887         int ret = -2;
 888
 889         if (ph->addrfamily == AF_INET)
 890         {
 891                 dprintf ("Setting TTLv4 to %i\n", ttl);
 892                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL,
 893                                 &ttl, sizeof (ttl));
 894         }
 895         else if (ph->addrfamily == AF_INET6)
 896         {
 897                 dprintf ("Setting TTLv6 to %i\n", ttl);
 898                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
 899                                 &ttl, sizeof (ttl));
 900         }
 901
 902         return (ret);
 903 }
 904
 905 static int ping_get_ident (void)
 906 {
 907         int fd;
 908         static int did_seed = 0;
 909
 910         int retval;
 911
 912         if (did_seed == 0)
 913         {
 914                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 915                 {
 916                         unsigned int seed;
 917
 918                         if (read (fd, &seed, sizeof (seed)) != -1)
 919                         {
 920                                 did_seed = 1;
 921                                 dprintf ("Random seed:   %#x\n", seed);
 922                                 srandom (seed);
 923                         }
 924
 925                         close (fd);
 926                 }
 927 #if WITH_DEBUG
 928                 else
 929                 {
 930                         char errbuf[PING_ERRMSG_LEN];
 931                         dprintf ("open (/dev/urandom): %s\n",
 932                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 933                 }
 934 #endif
 935         }
 936
 937         retval = (int) random ();
 938
 939         dprintf ("Random number: %#x\n", retval);
 940
 941         return (retval);
 942 }
 943
 944 static pinghost_t *ping_alloc (void)
 945 {
 946         pinghost_t *ph;
 947         size_t      ph_size;
 948
 949         ph_size = sizeof (pinghost_t)
 950                 + sizeof (struct sockaddr_storage)
 951                 + sizeof (struct timeval);
 952
 953         ph = (pinghost_t *) malloc (ph_size);
 954         if (ph == NULL)
 955                 return (NULL);
 956
 957         memset (ph, '\0', ph_size);
 958
 959         ph->timer   = (struct timeval *) (ph + 1);
 960         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
 961
 962         ph->addrlen = sizeof (struct sockaddr_storage);
 963         ph->fd      = -1;
 964         ph->latency = -1.0;
 965         ph->dropped = 0;
 966         ph->ident   = ping_get_ident () & 0xFFFF;
 967
 968         return (ph);
 969 }
 970
 971 static void ping_free (pinghost_t *ph)
 972 {
 973         if (ph->fd >= 0)
 974                 close (ph->fd);
 975
 976         if (ph->username != NULL)
 977                 free (ph->username);
 978
 979         if (ph->hostname != NULL)
 980                 free (ph->hostname);
 981
 982         if (ph->data != NULL)
 983                 free (ph->data);
 984
 985         free (ph);
 986 }
 987
 988 /*
 989  * public methods
 990  */
 991 const char *ping_get_error (pingobj_t *obj)
 992 {
 993         return (obj->errmsg);
 994 }
 995
 996 pingobj_t *ping_construct (void)
 997 {
 998         pingobj_t *obj;
 999
1000         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
1001                 return (NULL);
1002         memset (obj, '\0', sizeof (pingobj_t));
1003
1004         obj->timeout    = PING_DEF_TIMEOUT;
1005         obj->ttl        = PING_DEF_TTL;
1006         obj->addrfamily = PING_DEF_AF;
1007         obj->data       = strdup (PING_DEF_DATA);
1008
1009         return (obj);
1010 }
1011
1012 void ping_destroy (pingobj_t *obj)
1013 {
1014         pinghost_t *current;
1015         pinghost_t *next;
1016
1017         current = obj->head;
1018         next = NULL;
1019
1020         while (current != NULL)
1021         {
1022                 next = current->next;
1023                 ping_free (current);
1024                 current = next;
1025         }
1026
1027         if (obj->data != NULL)
1028                 free (obj->data);
1029
1030         if (obj->srcaddr != NULL)
1031                 free (obj->srcaddr);
1032
1033         free (obj);
1034
1035         return;
1036 }
1037
1038 int ping_setopt (pingobj_t *obj, int option, void *value)
1039 {
1040         int ret = 0;
1041
1042         switch (option)
1043         {
1044                 case PING_OPT_TIMEOUT:
1045                         obj->timeout = *((double *) value);
1046                         if (obj->timeout < 0.0)
1047                         {
1048                                 obj->timeout = PING_DEF_TIMEOUT;
1049                                 ret = -1;
1050                         }
1051                         break;
1052
1053                 case PING_OPT_TTL:
1054                         obj->ttl = *((int *) value);
1055                         if ((obj->ttl < 1) || (obj->ttl > 255))
1056                         {
1057                                 obj->ttl = PING_DEF_TTL;
1058                                 ret = -1;
1059                         }
1060                         else
1061                         {
1062                                 pinghost_t *ph;
1063
1064                                 for (ph = obj->head; ph != NULL; ph = ph->next)
1065                                         ping_set_ttl (ph, obj->ttl);
1066                         }
1067                         break;
1068
1069                 case PING_OPT_AF:
1070                         obj->addrfamily = *((int *) value);
1071                         if ((obj->addrfamily != AF_UNSPEC)
1072                                         && (obj->addrfamily != AF_INET)
1073                                         && (obj->addrfamily != AF_INET6))
1074                         {
1075                                 obj->addrfamily = PING_DEF_AF;
1076                                 ret = -1;
1077                         }
1078                         if (obj->srcaddr != NULL)
1079                         {
1080                                 free (obj->srcaddr);
1081                                 obj->srcaddr = NULL;
1082                         }
1083                         break;
1084
1085                 case PING_OPT_DATA:
1086                         if (obj->data != NULL)
1087                         {
1088                                 free (obj->data);
1089                                 obj->data = NULL;
1090                         }
1091                         obj->data = strdup ((const char *) value);
1092                         break;
1093
1094                 case PING_OPT_SOURCE:
1095                 {
1096                         char            *hostname = (char *) value;
1097                         struct addrinfo  ai_hints;
1098                         struct addrinfo *ai_list;
1099                         int              status;
1100 #if WITH_DEBUG
1101                         if (obj->addrfamily != AF_UNSPEC)
1102                         {
1103                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1104                         }
1105 #endif
1106                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1107                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1108 #if defined(AI_ADDRCONFIG)
1109                         ai_hints.ai_flags = AI_ADDRCONFIG;
1110 #endif
1111                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1112                         if (status != 0)
1113                         {
1114 #if defined(EAI_SYSTEM)
1115                                 char errbuf[PING_ERRMSG_LEN];
1116 #endif
1117                                 ping_set_error (obj, "getaddrinfo",
1118 #if defined(EAI_SYSTEM)
1119                                                 (status == EAI_SYSTEM)
1120                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1121 #endif
1122                                                 gai_strerror (status));
1123                                 ret = -1;
1124                                 break;
1125                         }
1126 #if WITH_DEBUG
1127                         if (ai_list->ai_next != NULL)
1128                         {
1129                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1130                         }
1131 #endif
1132                         if (obj->srcaddr == NULL)
1133                         {
1134                                 obj->srcaddrlen = 0;
1135                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1136                                 if (obj->srcaddr == NULL)
1137                                 {
1138                                         ping_set_errno (obj, errno);
1139                                         ret = -1;
1140                                         freeaddrinfo (ai_list);
1141                                         break;
1142                                 }
1143                         }
1144                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1145                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1146                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1147                                         ai_list->ai_addrlen);
1148                         obj->srcaddrlen = ai_list->ai_addrlen;
1149                         obj->addrfamily = ai_list->ai_family;
1150
1151                         freeaddrinfo (ai_list);
1152                 } /* case PING_OPT_SOURCE */
1153                 break;
1154
1155                 default:
1156                         ret = -2;
1157         } /* switch (option) */
1158
1159         return (ret);
1160 } /* int ping_setopt */
1161
1162
1163 int ping_send (pingobj_t *obj)
1164 {
1165         int ret;
1166
1167         if (ping_send_all (obj) < 0)
1168                 return (-1);
1169
1170         if ((ret = ping_receive_all (obj)) < 0)
1171                 return (-2);
1172
1173         return (ret);
1174 }
1175
1176 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1177 {
1178         while (ph != NULL)
1179         {
1180                 if (strcasecmp (ph->username, host) == 0)
1181                         break;
1182
1183                 ph = ph->next;
1184         }
1185
1186         return (ph);
1187 }
1188
1189 int ping_host_add (pingobj_t *obj, const char *host)
1190 {
1191         pinghost_t *ph;
1192
1193         struct addrinfo  ai_hints;
1194         struct addrinfo *ai_list, *ai_ptr;
1195         int              ai_return;
1196
1197         dprintf ("host = %s\n", host);
1198
1199         if (ping_host_search (obj->head, host) != NULL)
1200                 return (0);
1201
1202         memset (&ai_hints, '\0', sizeof (ai_hints));
1203         ai_hints.ai_flags     = 0;
1204 #ifdef AI_ADDRCONFIG
1205         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1206 #endif
1207 #ifdef AI_CANONNAME
1208         ai_hints.ai_flags    |= AI_CANONNAME;
1209 #endif
1210         ai_hints.ai_family    = obj->addrfamily;
1211         ai_hints.ai_socktype  = SOCK_RAW;
1212
1213         if ((ph = ping_alloc ()) == NULL)
1214         {
1215                 dprintf ("Out of memory!\n");
1216                 return (-1);
1217         }
1218
1219         if ((ph->username = strdup (host)) == NULL)
1220         {
1221                 dprintf ("Out of memory!\n");
1222                 ping_set_errno (obj, errno);
1223                 ping_free (ph);
1224                 return (-1);
1225         }
1226
1227         if ((ph->hostname = strdup (host)) == NULL)
1228         {
1229                 dprintf ("Out of memory!\n");
1230                 ping_set_errno (obj, errno);
1231                 ping_free (ph);
1232                 return (-1);
1233         }
1234
1235         /* obj->data is not garuanteed to be != NULL */
1236         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1237         {
1238                 dprintf ("Out of memory!\n");
1239                 ping_set_errno (obj, errno);
1240                 ping_free (ph);
1241                 return (-1);
1242         }
1243
1244         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1245         {
1246 #if defined(EAI_SYSTEM)
1247                 char errbuf[PING_ERRMSG_LEN];
1248 #endif
1249                 dprintf ("getaddrinfo failed\n");
1250                 ping_set_error (obj, "getaddrinfo",
1251 #if defined(EAI_SYSTEM)
1252                                                 (ai_return == EAI_SYSTEM)
1253                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1254 #endif
1255                                 gai_strerror (ai_return));
1256                 ping_free (ph);
1257                 return (-1);
1258         }
1259
1260         if (ai_list == NULL)
1261                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1262
1263         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1264         {
1265                 ph->fd = -1;
1266
1267                 if (ai_ptr->ai_family == AF_INET)
1268                 {
1269                         ai_ptr->ai_socktype = SOCK_RAW;
1270                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1271                 }
1272                 else if (ai_ptr->ai_family == AF_INET6)
1273                 {
1274                         ai_ptr->ai_socktype = SOCK_RAW;
1275                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1276                 }
1277                 else
1278                 {
1279                         char errmsg[PING_ERRMSG_LEN];
1280
1281                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1282                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1283
1284                         dprintf (errmsg);
1285                         ping_set_error (obj, "getaddrinfo", errmsg);
1286                         continue;
1287                 }
1288
1289                 /* TODO: Move this to a static function `ping_open_socket' and
1290                  * call it whenever the socket dies. */
1291                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1292                 if (ph->fd == -1)
1293                 {
1294 #if WITH_DEBUG
1295                         char errbuf[PING_ERRMSG_LEN];
1296                         dprintf ("socket: %s\n",
1297                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1298 #endif
1299                         ping_set_errno (obj, errno);
1300                         continue;
1301                 }
1302
1303                 if (obj->srcaddr != NULL)
1304                 {
1305                         assert (obj->srcaddrlen > 0);
1306                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1307
1308                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1309                         {
1310 #if WITH_DEBUG
1311                                 char errbuf[PING_ERRMSG_LEN];
1312                                 dprintf ("bind: %s\n",
1313                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1314 #endif
1315                                 ping_set_errno (obj, errno);
1316                                 close (ph->fd);
1317                                 ph->fd = -1;
1318                                 continue;
1319                         }
1320                 }
1321
1322                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1323                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1324                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1325                 ph->addrlen = ai_ptr->ai_addrlen;
1326                 ph->addrfamily = ai_ptr->ai_family;
1327
1328 #ifdef AI_CANONNAME
1329                 if ((ai_ptr->ai_canonname != NULL)
1330                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1331                 {
1332                         char *old_hostname;
1333
1334                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1335                                         ph->hostname, ai_ptr->ai_canonname);
1336
1337                         old_hostname = ph->hostname;
1338                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1339                         {
1340                                 /* strdup failed, falling back to old hostname */
1341                                 ph->hostname = old_hostname;
1342                         }
1343                         else if (old_hostname != NULL)
1344                         {
1345                                 free (old_hostname);
1346                         }
1347                 }
1348 #endif /* AI_CANONNAME */
1349
1350                 if (ph->addrfamily == AF_INET)
1351                 {
1352                         int opt = 1;
1353
1354                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1355                                         &opt, sizeof (opt));
1356                 }
1357 #if defined(IPPROTO_IPV6) && defined(IPV6_RECVHOPLIMIT)
1358                 else if (ph->addrfamily == AF_INET6)
1359                 {
1360                         int opt = 1;
1361
1362                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1363                                         &opt, sizeof (opt));
1364                 }
1365 #endif
1366
1367                 break;
1368         }
1369
1370         freeaddrinfo (ai_list);
1371
1372         if (ph->fd < 0)
1373         {
1374                 ping_free (ph);
1375                 return (-1);
1376         }
1377
1378         /*
1379          * Adding in the front is much easier, but then the iterator will
1380          * return the host that was added last as first host. That's just not
1381          * nice. -octo
1382          */
1383         if (obj->head == NULL)
1384         {
1385                 obj->head = ph;
1386         }
1387         else
1388         {
1389                 pinghost_t *hptr;
1390
1391                 hptr = obj->head;
1392                 while (hptr->next != NULL)
1393                         hptr = hptr->next;
1394
1395                 assert ((hptr != NULL) && (hptr->next == NULL));
1396                 hptr->next = ph;
1397         }
1398
1399         ping_set_ttl (ph, obj->ttl);
1400
1401         return (0);
1402 } /* int ping_host_add */
1403
1404 int ping_host_remove (pingobj_t *obj, const char *host)
1405 {
1406         pinghost_t *pre, *cur;
1407
1408         pre = NULL;
1409         cur = obj->head;
1410
1411         while (cur != NULL)
1412         {
1413                 if (strcasecmp (host, cur->username) == 0)
1414                         break;
1415
1416                 pre = cur;
1417                 cur = cur->next;
1418         }
1419
1420         if (cur == NULL)
1421         {
1422                 ping_set_error (obj, "ping_host_remove", "Host not found");
1423                 return (-1);
1424         }
1425
1426         if (pre == NULL)
1427                 obj->head = cur->next;
1428         else
1429                 pre->next = cur->next;
1430
1431         ping_free (cur);
1432
1433         return (0);
1434 }
1435
1436 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1437 {
1438         return ((pingobj_iter_t *) obj->head);
1439 }
1440
1441 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1442 {
1443         return ((pingobj_iter_t *) iter->next);
1444 }
1445
1446 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1447                 void *buffer, size_t *buffer_len)
1448 {
1449         int ret = EINVAL;
1450
1451         size_t orig_buffer_len = *buffer_len;
1452
1453         switch (info)
1454         {
1455                 case PING_INFO_USERNAME:
1456                         ret = ENOMEM;
1457                         *buffer_len = strlen (iter->username) + 1;
1458                         if (orig_buffer_len <= *buffer_len)
1459                                 break;
1460                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1461                          * will copy `*buffer_len' and pad the rest of
1462                          * `buffer' with null-bytes */
1463                         strncpy (buffer, iter->username, orig_buffer_len);
1464                         ret = 0;
1465                         break;
1466
1467                 case PING_INFO_HOSTNAME:
1468                         ret = ENOMEM;
1469                         *buffer_len = strlen (iter->hostname) + 1;
1470                         if (orig_buffer_len < *buffer_len)
1471                                 break;
1472                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1473                          * will copy `*buffer_len' and pad the rest of
1474                          * `buffer' with null-bytes */
1475                         strncpy (buffer, iter->hostname, orig_buffer_len);
1476                         ret = 0;
1477                         break;
1478
1479                 case PING_INFO_ADDRESS:
1480                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1481                                         iter->addrlen,
1482                                         (char *) buffer,
1483                                         *buffer_len,
1484                                         NULL, 0,
1485                                         NI_NUMERICHOST);
1486                         if (ret != 0)
1487                         {
1488                                 if ((ret == EAI_MEMORY)
1489 #ifdef EAI_OVERFLOW
1490                                                 || (ret == EAI_OVERFLOW)
1491 #endif
1492                                    )
1493                                         ret = ENOMEM;
1494 #if defined(EAI_SYSTEM)
1495                                 else if (ret == EAI_SYSTEM)
1496                                         ret = errno;
1497 #endif
1498                                 else
1499                                         ret = EINVAL;
1500                         }
1501                         break;
1502
1503                 case PING_INFO_FAMILY:
1504                         ret = ENOMEM;
1505                         *buffer_len = sizeof (int);
1506                         if (orig_buffer_len < sizeof (int))
1507                                 break;
1508                         *((int *) buffer) = iter->addrfamily;
1509                         ret = 0;
1510                         break;
1511
1512                 case PING_INFO_LATENCY:
1513                         ret = ENOMEM;
1514                         *buffer_len = sizeof (double);
1515                         if (orig_buffer_len < sizeof (double))
1516                                 break;
1517                         *((double *) buffer) = iter->latency;
1518                         ret = 0;
1519                         break;
1520
1521                 case PING_INFO_DROPPED:
1522                         ret = ENOMEM;
1523                         *buffer_len = sizeof (uint32_t);
1524                         if (orig_buffer_len < sizeof (uint32_t))
1525                                 break;
1526                         *((uint32_t *) buffer) = iter->dropped;
1527                         ret = 0;
1528                         break;
1529
1530                 case PING_INFO_SEQUENCE:
1531                         ret = ENOMEM;
1532                         *buffer_len = sizeof (unsigned int);
1533                         if (orig_buffer_len < sizeof (unsigned int))
1534                                 break;
1535                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1536                         ret = 0;
1537                         break;
1538
1539                 case PING_INFO_IDENT:
1540                         ret = ENOMEM;
1541                         *buffer_len = sizeof (uint16_t);
1542                         if (orig_buffer_len < sizeof (uint16_t))
1543                                 break;
1544                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1545                         ret = 0;
1546                         break;
1547
1548                 case PING_INFO_DATA:
1549                         ret = ENOMEM;
1550                         *buffer_len = strlen (iter->data);
1551                         if (orig_buffer_len < *buffer_len)
1552                                 break;
1553                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1554                         ret = 0;
1555                         break;
1556
1557                 case PING_INFO_RECV_TTL:
1558                         ret = ENOMEM;
1559                         *buffer_len = sizeof (int);
1560                         if (orig_buffer_len < sizeof (int))
1561                                 break;
1562                         *((int *) buffer) = iter->recv_ttl;
1563                         ret = 0;
1564                         break;
1565         }
1566
1567         return (ret);
1568 } /* ping_iterator_get_info */
1569
1570 void *ping_iterator_get_context (pingobj_iter_t *iter)
1571 {
1572         return (iter->context);
1573 }
1574
1575 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1576 {
1577         iter->context = context;
1578 }