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         return (ptr);
 347 }
 348
 349 #ifndef ICMP6_ECHO_REQUEST
 350 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
 351 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
 352 # else
 353 #  define ICMP6_ECHO_REQUEST 128
 354 # endif
 355 #endif
 356
 357 #ifndef ICMP6_ECHO_REPLY
 358 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
 359 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
 360 # else
 361 #  define ICMP6_ECHO_REPLY 129
 362 # endif
 363 #endif
 364
 365 static pinghost_t *ping_receive_ipv6 (pinghost_t *ph, char *buffer, size_t buffer_len)
 366 {
 367         struct icmp6_hdr *icmp_hdr;
 368
 369         uint16_t ident;
 370         uint16_t seq;
 371
 372         pinghost_t *ptr;
 373
 374         if (buffer_len < sizeof (struct icmp6_hdr))
 375                 return (NULL);
 376
 377         icmp_hdr = (struct icmp6_hdr *) buffer;
 378         buffer     += sizeof (struct icmp);
 379         buffer_len -= sizeof (struct icmp);
 380
 381         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 382         {
 383                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 384                 return (NULL);
 385         }
 386
 387         if (icmp_hdr->icmp6_code != 0)
 388         {
 389                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 390                 return (NULL);
 391         }
 392
 393         ident = ntohs (icmp_hdr->icmp6_id);
 394         seq   = ntohs (icmp_hdr->icmp6_seq);
 395
 396         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 397         {
 398                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 399                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 400
 401                 if (ptr->addrfamily != AF_INET6)
 402                         continue;
 403
 404                 if (!timerisset (ptr->timer))
 405                         continue;
 406
 407                 if (ptr->ident != ident)
 408                         continue;
 409
 410                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 411                         continue;
 412
 413                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
 414                                 ptr->hostname, ident, seq);
 415
 416                 break;
 417         }
 418
 419         if (ptr == NULL)
 420         {
 421                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
 422                                 ident, seq);
 423         }
 424
 425         return (ptr);
 426 }
 427
 428 static int ping_receive_one (int fd, pinghost_t *ph, struct timeval *now)
 429 {
 430         struct timeval diff;
 431         pinghost_t *host = NULL;
 432         int family;
 433         int recv_ttl;
 434
 435         /*
 436          * Set up the receive buffer..
 437          */
 438         struct msghdr msghdr;
 439         struct cmsghdr *cmsg;
 440         char payload_buffer[4096];
 441         ssize_t payload_buffer_len;
 442         char control_buffer[4096];
 443         struct iovec payload_iovec;
 444
 445         memset (&payload_iovec, 0, sizeof (payload_iovec));
 446         payload_iovec.iov_base = payload_buffer;
 447         payload_iovec.iov_len = sizeof (payload_buffer);
 448
 449         memset (&msghdr, 0, sizeof (msghdr));
 450         /* unspecified source address */
 451         msghdr.msg_name = NULL;
 452         msghdr.msg_namelen = 0;
 453         /* output buffer vector, see readv(2) */
 454         msghdr.msg_iov = &payload_iovec;
 455         msghdr.msg_iovlen = 1;
 456         /* output buffer for control messages */
 457         msghdr.msg_control = control_buffer;
 458         msghdr.msg_controllen = sizeof (control_buffer);
 459         /* flags; this is an output only field.. */
 460         msghdr.msg_flags = 0;
 461 #ifdef MSG_XPG4_2
 462         msghdr.msg_flags |= MSG_XPG4_2;
 463 #endif
 464
 465         payload_buffer_len = recvmsg (fd, &msghdr, /* flags = */ 0);
 466         if (payload_buffer_len < 0)
 467         {
 468 #if WITH_DEBUG
 469                 char errbuf[PING_ERRMSG_LEN];
 470                 dprintf ("recvfrom: %s\n",
 471                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 472 #endif
 473                 return (-1);
 474         }
 475         dprintf ("Read %zi bytes from fd = %i\n", payload_buffer_len, fd);
 476
 477         /* Iterate over all auxiliary data in msghdr */
 478         family = -1;
 479         recv_ttl = -1;
 480         for (cmsg = CMSG_FIRSTHDR (&msghdr); /* {{{ */
 481                         cmsg != NULL;
 482                         cmsg = CMSG_NXTHDR (&msghdr, cmsg))
 483         {
 484                 if (cmsg->cmsg_level == IPPROTO_IP) /* {{{ */
 485                 {
 486                         family = AF_INET;
 487                         if (cmsg->cmsg_type == IP_TTL)
 488                         {
 489                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 490                                                 sizeof (recv_ttl));
 491                                 dprintf ("TTLv4 = %i;\n", recv_ttl);
 492                         }
 493                         else
 494                         {
 495                                 dprintf ("Not handling option %i.\n",
 496                                                 cmsg->cmsg_type);
 497                         }
 498                 } /* }}} */
 499                 else if (cmsg->cmsg_level == IPPROTO_IPV6) /* {{{ */
 500                 {
 501                         family = AF_INET6;
 502                         if (cmsg->cmsg_type == IPV6_HOPLIMIT)
 503                         {
 504                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 505                                                 sizeof (recv_ttl));
 506                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 507                         }
 508                         else
 509                         {
 510                                 dprintf ("Not handling option %i.\n",
 511                                                 cmsg->cmsg_type);
 512                         }
 513                 } /* }}} */
 514                 else
 515                 {
 516                         dprintf ("Don't know how to handle "
 517                                         "unknown protocol %i.\n",
 518                                         cmsg->cmsg_level);
 519                 }
 520         } /* }}} for (cmsg) */
 521
 522         if (family == AF_INET)
 523         {
 524                 host = ping_receive_ipv4 (ph, payload_buffer, payload_buffer_len);
 525                 if (host == NULL)
 526                         return (-1);
 527         }
 528         else if (family == AF_INET6)
 529         {
 530                 host = ping_receive_ipv6 (ph, payload_buffer, payload_buffer_len);
 531                 if (host == NULL)
 532                         return (-1);
 533         }
 534         else
 535         {
 536                 dprintf ("ping_receive_one: Unknown address family %i.\n",
 537                                 family);
 538                 return (-1);
 539         }
 540
 541         dprintf ("rcvd: %12i.%06i\n",
 542                         (int) now->tv_sec,
 543                         (int) now->tv_usec);
 544         dprintf ("sent: %12i.%06i\n",
 545                         (int) host->timer->tv_sec,
 546                         (int) host->timer->tv_usec);
 547
 548         if (ping_timeval_sub (now, host->timer, &diff) < 0)
 549         {
 550                 timerclear (host->timer);
 551                 return (-1);
 552         }
 553
 554         dprintf ("diff: %12i.%06i\n",
 555                         (int) diff.tv_sec,
 556                         (int) diff.tv_usec);
 557
 558         host->latency  = ((double) diff.tv_usec) / 1000.0;
 559         host->latency += ((double) diff.tv_sec)  * 1000.0;
 560
 561         host->recv_ttl = recv_ttl;
 562
 563         timerclear (host->timer);
 564
 565         return (0);
 566 }
 567
 568 static int ping_receive_all (pingobj_t *obj)
 569 {
 570         fd_set readfds;
 571         int num_readfds;
 572         int max_readfds;
 573
 574         pinghost_t *ph;
 575         pinghost_t *ptr;
 576
 577         struct timeval endtime;
 578         struct timeval nowtime;
 579         struct timeval timeout;
 580         int status;
 581
 582         int ret;
 583
 584         ph = obj->head;
 585         ret = 0;
 586
 587         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 588                 ptr->latency = -1.0;
 589
 590         if (gettimeofday (&nowtime, NULL) == -1)
 591         {
 592                 ping_set_errno (obj, errno);
 593                 return (-1);
 594         }
 595
 596         /* Set up timeout */
 597         timeout.tv_sec = (time_t) obj->timeout;
 598         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 599
 600         dprintf ("Set timeout to %i.%06i seconds\n",
 601                         (int) timeout.tv_sec,
 602                         (int) timeout.tv_usec);
 603
 604         ping_timeval_add (&nowtime, &timeout, &endtime);
 605
 606         while (1)
 607         {
 608                 FD_ZERO (&readfds);
 609                 num_readfds =  0;
 610                 max_readfds = -1;
 611
 612                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 613                 {
 614                         if (!timerisset (ptr->timer))
 615                                 continue;
 616
 617                         FD_SET (ptr->fd, &readfds);
 618                         num_readfds++;
 619
 620                         if (max_readfds < ptr->fd)
 621                                 max_readfds = ptr->fd;
 622                 }
 623
 624                 if (num_readfds == 0)
 625                         break;
 626
 627                 if (gettimeofday (&nowtime, NULL) == -1)
 628                 {
 629                         ping_set_errno (obj, errno);
 630                         return (-1);
 631                 }
 632
 633                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 634                         break;
 635
 636                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_readfds,
 637                                 (int) timeout.tv_sec,
 638                                 (int) timeout.tv_usec);
 639
 640                 status = select (max_readfds + 1, &readfds, NULL, NULL, &timeout);
 641
 642                 if (gettimeofday (&nowtime, NULL) == -1)
 643                 {
 644                         ping_set_errno (obj, errno);
 645                         return (-1);
 646                 }
 647
 648                 if ((status == -1) && (errno == EINTR))
 649                 {
 650                         dprintf ("select was interrupted by signal..\n");
 651                         continue;
 652                 }
 653                 else if (status < 0)
 654                 {
 655 #if WITH_DEBUG
 656                         char errbuf[PING_ERRMSG_LEN];
 657                         dprintf ("select: %s\n",
 658                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 659 #endif
 660                         break;
 661                 }
 662                 else if (status == 0)
 663                 {
 664                         dprintf ("select timed out\n");
 665                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 666                                 if (ptr->latency < 0.0)
 667                                         ptr->dropped++;
 668                         break;
 669                 }
 670
 671                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 672                 {
 673                         if (FD_ISSET (ptr->fd, &readfds))
 674                                 if (ping_receive_one (ptr->fd, ph, &nowtime) == 0)
 675                                         ret++;
 676                 }
 677         } /* while (1) */
 678
 679         return (ret);
 680 }
 681
 682 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 683  * Sending functions:                                                        *
 684  *                                                                           *
 685  * ping_send_all                                                             *
 686  * +-> ping_send_one_ipv4                                                    *
 687  * `-> ping_send_one_ipv6                                                    *
 688  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 689 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 690                 const void *buf, size_t buflen)
 691 {
 692         ssize_t ret;
 693
 694         if (gettimeofday (ph->timer, NULL) == -1)
 695         {
 696                 timerclear (ph->timer);
 697                 return (-1);
 698         }
 699
 700         ret = sendto (ph->fd, buf, buflen, 0,
 701                         (struct sockaddr *) ph->addr, ph->addrlen);
 702
 703         if (ret < 0)
 704         {
 705 #if defined(EHOSTUNREACH)
 706                 if (errno == EHOSTUNREACH)
 707                         return (0);
 708 #endif
 709 #if defined(ENETUNREACH)
 710                 if (errno == ENETUNREACH)
 711                         return (0);
 712 #endif
 713                 ping_set_errno (obj, errno);
 714         }
 715
 716         return (ret);
 717 }
 718
 719 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 720 {
 721         struct icmp *icmp4;
 722         int status;
 723
 724         char buf[4096];
 725         int  buflen;
 726
 727         char *data;
 728         int   datalen;
 729
 730         dprintf ("ph->hostname = %s\n", ph->hostname);
 731
 732         memset (buf, '\0', sizeof (buf));
 733         icmp4 = (struct icmp *) buf;
 734         data  = (char *) (icmp4 + 1);
 735
 736         icmp4->icmp_type  = ICMP_ECHO;
 737         icmp4->icmp_code  = 0;
 738         icmp4->icmp_cksum = 0;
 739         icmp4->icmp_id    = htons (ph->ident);
 740         icmp4->icmp_seq   = htons (ph->sequence);
 741
 742         buflen = 4096 - sizeof (struct icmp);
 743         strncpy (data, ph->data, buflen);
 744         datalen = strlen (data);
 745
 746         buflen = datalen + sizeof (struct icmp);
 747
 748         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 749
 750         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 751
 752         status = ping_sendto (obj, ph, buf, buflen);
 753         if (status < 0)
 754         {
 755                 perror ("ping_sendto");
 756                 return (-1);
 757         }
 758
 759         dprintf ("sendto: status = %i\n", status);
 760
 761         return (0);
 762 }
 763
 764 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 765 {
 766         struct icmp6_hdr *icmp6;
 767         int status;
 768
 769         char buf[4096];
 770         int  buflen;
 771
 772         char *data;
 773         int   datalen;
 774
 775         dprintf ("ph->hostname = %s\n", ph->hostname);
 776
 777         memset (buf, '\0', sizeof (buf));
 778         icmp6 = (struct icmp6_hdr *) buf;
 779         data  = (char *) (icmp6 + 1);
 780
 781         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 782         icmp6->icmp6_code  = 0;
 783         /* The checksum will be calculated by the TCP/IP stack.  */
 784         /* FIXME */
 785         icmp6->icmp6_cksum = 0;
 786         icmp6->icmp6_id    = htons (ph->ident);
 787         icmp6->icmp6_seq   = htons (ph->sequence);
 788
 789         buflen = 4096 - sizeof (struct icmp6_hdr);
 790         strncpy (data, ph->data, buflen);
 791         datalen = strlen (data);
 792
 793         buflen = datalen + sizeof (struct icmp6_hdr);
 794
 795         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 796
 797         status = ping_sendto (obj, ph, buf, buflen);
 798         if (status < 0)
 799         {
 800                 perror ("ping_sendto");
 801                 return (-1);
 802         }
 803
 804         dprintf ("sendto: status = %i\n", status);
 805
 806         return (0);
 807 }
 808
 809 static int ping_send_all (pingobj_t *obj)
 810 {
 811         pinghost_t *ph;
 812         pinghost_t *ptr;
 813
 814         int ret;
 815
 816         ret = 0;
 817         ph = obj->head;
 818
 819         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 820         {
 821                 /* start timer.. The GNU `ping6' starts the timer before
 822                  * sending the packet, so I will do that too */
 823                 if (gettimeofday (ptr->timer, NULL) == -1)
 824                 {
 825 #if WITH_DEBUG
 826                         char errbuf[PING_ERRMSG_LEN];
 827                         dprintf ("gettimeofday: %s\n",
 828                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 829 #endif
 830                         timerclear (ptr->timer);
 831                         ret--;
 832                         continue;
 833                 }
 834                 else
 835                 {
 836                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 837                 }
 838
 839                 if (ptr->addrfamily == AF_INET6)
 840                 {
 841                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 842                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 843                         {
 844                                 timerclear (ptr->timer);
 845                                 ret--;
 846                                 continue;
 847                         }
 848                 }
 849                 else if (ptr->addrfamily == AF_INET)
 850                 {
 851                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 852                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 853                         {
 854                                 timerclear (ptr->timer);
 855                                 ret--;
 856                                 continue;
 857                         }
 858                 }
 859                 else /* this should not happen */
 860                 {
 861                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 862                         timerclear (ptr->timer);
 863                         ret--;
 864                         continue;
 865                 }
 866
 867                 ptr->sequence++;
 868         }
 869
 870         return (ret);
 871 }
 872
 873 /*
 874  * Set the TTL of a socket protocol independently.
 875  */
 876 static int ping_set_ttl (pinghost_t *ph, int ttl)
 877 {
 878         int ret = -2;
 879
 880         if (ph->addrfamily == AF_INET)
 881         {
 882                 dprintf ("Setting TTLv4 to %i\n", ttl);
 883                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL,
 884                                 &ttl, sizeof (ttl));
 885         }
 886         else if (ph->addrfamily == AF_INET6)
 887         {
 888                 dprintf ("Setting TTLv6 to %i\n", ttl);
 889                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
 890                                 &ttl, sizeof (ttl));
 891         }
 892
 893         return (ret);
 894 }
 895
 896 static int ping_get_ident (void)
 897 {
 898         int fd;
 899         static int did_seed = 0;
 900
 901         int retval;
 902
 903         if (did_seed == 0)
 904         {
 905                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 906                 {
 907                         unsigned int seed;
 908
 909                         if (read (fd, &seed, sizeof (seed)) != -1)
 910                         {
 911                                 did_seed = 1;
 912                                 dprintf ("Random seed:   %#x\n", seed);
 913                                 srandom (seed);
 914                         }
 915
 916                         close (fd);
 917                 }
 918 #if WITH_DEBUG
 919                 else
 920                 {
 921                         char errbuf[PING_ERRMSG_LEN];
 922                         dprintf ("open (/dev/urandom): %s\n",
 923                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 924                 }
 925 #endif
 926         }
 927
 928         retval = (int) random ();
 929
 930         dprintf ("Random number: %#x\n", retval);
 931
 932         return (retval);
 933 }
 934
 935 static pinghost_t *ping_alloc (void)
 936 {
 937         pinghost_t *ph;
 938         size_t      ph_size;
 939
 940         ph_size = sizeof (pinghost_t)
 941                 + sizeof (struct sockaddr_storage)
 942                 + sizeof (struct timeval);
 943
 944         ph = (pinghost_t *) malloc (ph_size);
 945         if (ph == NULL)
 946                 return (NULL);
 947
 948         memset (ph, '\0', ph_size);
 949
 950         ph->timer   = (struct timeval *) (ph + 1);
 951         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
 952
 953         ph->addrlen = sizeof (struct sockaddr_storage);
 954         ph->fd      = -1;
 955         ph->latency = -1.0;
 956         ph->dropped = 0;
 957         ph->ident   = ping_get_ident () & 0xFFFF;
 958
 959         return (ph);
 960 }
 961
 962 static void ping_free (pinghost_t *ph)
 963 {
 964         if (ph->fd >= 0)
 965                 close (ph->fd);
 966
 967         if (ph->username != NULL)
 968                 free (ph->username);
 969
 970         if (ph->hostname != NULL)
 971                 free (ph->hostname);
 972
 973         if (ph->data != NULL)
 974                 free (ph->data);
 975
 976         free (ph);
 977 }
 978
 979 /*
 980  * public methods
 981  */
 982 const char *ping_get_error (pingobj_t *obj)
 983 {
 984         return (obj->errmsg);
 985 }
 986
 987 pingobj_t *ping_construct (void)
 988 {
 989         pingobj_t *obj;
 990
 991         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
 992                 return (NULL);
 993         memset (obj, '\0', sizeof (pingobj_t));
 994
 995         obj->timeout    = PING_DEF_TIMEOUT;
 996         obj->ttl        = PING_DEF_TTL;
 997         obj->addrfamily = PING_DEF_AF;
 998         obj->data       = strdup (PING_DEF_DATA);
 999
1000         return (obj);
1001 }
1002
1003 void ping_destroy (pingobj_t *obj)
1004 {
1005         pinghost_t *current;
1006         pinghost_t *next;
1007
1008         current = obj->head;
1009         next = NULL;
1010
1011         while (current != NULL)
1012         {
1013                 next = current->next;
1014                 ping_free (current);
1015                 current = next;
1016         }
1017
1018         if (obj->data != NULL)
1019                 free (obj->data);
1020
1021         if (obj->srcaddr != NULL)
1022                 free (obj->srcaddr);
1023
1024         free (obj);
1025
1026         return;
1027 }
1028
1029 int ping_setopt (pingobj_t *obj, int option, void *value)
1030 {
1031         int ret = 0;
1032
1033         switch (option)
1034         {
1035                 case PING_OPT_TIMEOUT:
1036                         obj->timeout = *((double *) value);
1037                         if (obj->timeout < 0.0)
1038                         {
1039                                 obj->timeout = PING_DEF_TIMEOUT;
1040                                 ret = -1;
1041                         }
1042                         break;
1043
1044                 case PING_OPT_TTL:
1045                         obj->ttl = *((int *) value);
1046                         if ((obj->ttl < 1) || (obj->ttl > 255))
1047                         {
1048                                 obj->ttl = PING_DEF_TTL;
1049                                 ret = -1;
1050                         }
1051                         else
1052                         {
1053                                 pinghost_t *ph;
1054
1055                                 for (ph = obj->head; ph != NULL; ph = ph->next)
1056                                         ping_set_ttl (ph, obj->ttl);
1057                         }
1058                         break;
1059
1060                 case PING_OPT_AF:
1061                         obj->addrfamily = *((int *) value);
1062                         if ((obj->addrfamily != AF_UNSPEC)
1063                                         && (obj->addrfamily != AF_INET)
1064                                         && (obj->addrfamily != AF_INET6))
1065                         {
1066                                 obj->addrfamily = PING_DEF_AF;
1067                                 ret = -1;
1068                         }
1069                         if (obj->srcaddr != NULL)
1070                         {
1071                                 free (obj->srcaddr);
1072                                 obj->srcaddr = NULL;
1073                         }
1074                         break;
1075
1076                 case PING_OPT_DATA:
1077                         if (obj->data != NULL)
1078                         {
1079                                 free (obj->data);
1080                                 obj->data = NULL;
1081                         }
1082                         obj->data = strdup ((const char *) value);
1083                         break;
1084
1085                 case PING_OPT_SOURCE:
1086                 {
1087                         char            *hostname = (char *) value;
1088                         struct addrinfo  ai_hints;
1089                         struct addrinfo *ai_list;
1090                         int              status;
1091 #if WITH_DEBUG
1092                         if (obj->addrfamily != AF_UNSPEC)
1093                         {
1094                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1095                         }
1096 #endif
1097                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1098                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1099 #if defined(AI_ADDRCONFIG)
1100                         ai_hints.ai_flags = AI_ADDRCONFIG;
1101 #endif
1102                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1103                         if (status != 0)
1104                         {
1105 #if defined(EAI_SYSTEM)
1106                                 char errbuf[PING_ERRMSG_LEN];
1107 #endif
1108                                 ping_set_error (obj, "getaddrinfo",
1109 #if defined(EAI_SYSTEM)
1110                                                 (status == EAI_SYSTEM)
1111                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1112 #endif
1113                                                 gai_strerror (status));
1114                                 ret = -1;
1115                                 break;
1116                         }
1117 #if WITH_DEBUG
1118                         if (ai_list->ai_next != NULL)
1119                         {
1120                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1121                         }
1122 #endif
1123                         if (obj->srcaddr == NULL)
1124                         {
1125                                 obj->srcaddrlen = 0;
1126                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1127                                 if (obj->srcaddr == NULL)
1128                                 {
1129                                         ping_set_errno (obj, errno);
1130                                         ret = -1;
1131                                         freeaddrinfo (ai_list);
1132                                         break;
1133                                 }
1134                         }
1135                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1136                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1137                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1138                                         ai_list->ai_addrlen);
1139                         obj->srcaddrlen = ai_list->ai_addrlen;
1140                         obj->addrfamily = ai_list->ai_family;
1141
1142                         freeaddrinfo (ai_list);
1143                 } /* case PING_OPT_SOURCE */
1144                 break;
1145
1146                 default:
1147                         ret = -2;
1148         } /* switch (option) */
1149
1150         return (ret);
1151 } /* int ping_setopt */
1152
1153
1154 int ping_send (pingobj_t *obj)
1155 {
1156         int ret;
1157
1158         if (ping_send_all (obj) < 0)
1159                 return (-1);
1160
1161         if ((ret = ping_receive_all (obj)) < 0)
1162                 return (-2);
1163
1164         return (ret);
1165 }
1166
1167 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1168 {
1169         while (ph != NULL)
1170         {
1171                 if (strcasecmp (ph->username, host) == 0)
1172                         break;
1173
1174                 ph = ph->next;
1175         }
1176
1177         return (ph);
1178 }
1179
1180 int ping_host_add (pingobj_t *obj, const char *host)
1181 {
1182         pinghost_t *ph;
1183
1184         struct addrinfo  ai_hints;
1185         struct addrinfo *ai_list, *ai_ptr;
1186         int              ai_return;
1187
1188         dprintf ("host = %s\n", host);
1189
1190         if (ping_host_search (obj->head, host) != NULL)
1191                 return (0);
1192
1193         memset (&ai_hints, '\0', sizeof (ai_hints));
1194         ai_hints.ai_flags     = 0;
1195 #ifdef AI_ADDRCONFIG
1196         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1197 #endif
1198 #ifdef AI_CANONNAME
1199         ai_hints.ai_flags    |= AI_CANONNAME;
1200 #endif
1201         ai_hints.ai_family    = obj->addrfamily;
1202         ai_hints.ai_socktype  = SOCK_RAW;
1203
1204         if ((ph = ping_alloc ()) == NULL)
1205         {
1206                 dprintf ("Out of memory!\n");
1207                 return (-1);
1208         }
1209
1210         if ((ph->username = strdup (host)) == NULL)
1211         {
1212                 dprintf ("Out of memory!\n");
1213                 ping_set_errno (obj, errno);
1214                 ping_free (ph);
1215                 return (-1);
1216         }
1217
1218         if ((ph->hostname = strdup (host)) == NULL)
1219         {
1220                 dprintf ("Out of memory!\n");
1221                 ping_set_errno (obj, errno);
1222                 ping_free (ph);
1223                 return (-1);
1224         }
1225
1226         /* obj->data is not garuanteed to be != NULL */
1227         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1228         {
1229                 dprintf ("Out of memory!\n");
1230                 ping_set_errno (obj, errno);
1231                 ping_free (ph);
1232                 return (-1);
1233         }
1234
1235         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1236         {
1237 #if defined(EAI_SYSTEM)
1238                 char errbuf[PING_ERRMSG_LEN];
1239 #endif
1240                 dprintf ("getaddrinfo failed\n");
1241                 ping_set_error (obj, "getaddrinfo",
1242 #if defined(EAI_SYSTEM)
1243                                                 (ai_return == EAI_SYSTEM)
1244                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1245 #endif
1246                                 gai_strerror (ai_return));
1247                 ping_free (ph);
1248                 return (-1);
1249         }
1250
1251         if (ai_list == NULL)
1252                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1253
1254         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1255         {
1256                 ph->fd = -1;
1257
1258                 if (ai_ptr->ai_family == AF_INET)
1259                 {
1260                         ai_ptr->ai_socktype = SOCK_RAW;
1261                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1262                 }
1263                 else if (ai_ptr->ai_family == AF_INET6)
1264                 {
1265                         ai_ptr->ai_socktype = SOCK_RAW;
1266                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1267                 }
1268                 else
1269                 {
1270                         char errmsg[PING_ERRMSG_LEN];
1271
1272                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1273                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1274
1275                         dprintf (errmsg);
1276                         ping_set_error (obj, "getaddrinfo", errmsg);
1277                         continue;
1278                 }
1279
1280                 /* TODO: Move this to a static function `ping_open_socket' and
1281                  * call it whenever the socket dies. */
1282                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1283                 if (ph->fd == -1)
1284                 {
1285 #if WITH_DEBUG
1286                         char errbuf[PING_ERRMSG_LEN];
1287                         dprintf ("socket: %s\n",
1288                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1289 #endif
1290                         ping_set_errno (obj, errno);
1291                         continue;
1292                 }
1293
1294                 if (obj->srcaddr != NULL)
1295                 {
1296                         assert (obj->srcaddrlen > 0);
1297                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1298
1299                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1300                         {
1301 #if WITH_DEBUG
1302                                 char errbuf[PING_ERRMSG_LEN];
1303                                 dprintf ("bind: %s\n",
1304                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1305 #endif
1306                                 ping_set_errno (obj, errno);
1307                                 close (ph->fd);
1308                                 ph->fd = -1;
1309                                 continue;
1310                         }
1311                 }
1312
1313                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1314                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1315                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1316                 ph->addrlen = ai_ptr->ai_addrlen;
1317                 ph->addrfamily = ai_ptr->ai_family;
1318
1319 #ifdef AI_CANONNAME
1320                 if ((ai_ptr->ai_canonname != NULL)
1321                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1322                 {
1323                         char *old_hostname;
1324
1325                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1326                                         ph->hostname, ai_ptr->ai_canonname);
1327
1328                         old_hostname = ph->hostname;
1329                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1330                         {
1331                                 /* strdup failed, falling back to old hostname */
1332                                 ph->hostname = old_hostname;
1333                         }
1334                         else if (old_hostname != NULL)
1335                         {
1336                                 free (old_hostname);
1337                         }
1338                 }
1339 #endif /* AI_CANONNAME */
1340
1341                 if (ph->addrfamily == AF_INET)
1342                 {
1343                         int opt = 1;
1344
1345                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1346                                         &opt, sizeof (opt));
1347                 }
1348                 else if (ph->addrfamily == AF_INET6)
1349                 {
1350                         int opt = 1;
1351
1352                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1353                                         &opt, sizeof (opt));
1354                 }
1355
1356                 break;
1357         }
1358
1359         freeaddrinfo (ai_list);
1360
1361         if (ph->fd < 0)
1362         {
1363                 ping_free (ph);
1364                 return (-1);
1365         }
1366
1367         /*
1368          * Adding in the front is much easier, but then the iterator will
1369          * return the host that was added last as first host. That's just not
1370          * nice. -octo
1371          */
1372         if (obj->head == NULL)
1373         {
1374                 obj->head = ph;
1375         }
1376         else
1377         {
1378                 pinghost_t *hptr;
1379
1380                 hptr = obj->head;
1381                 while (hptr->next != NULL)
1382                         hptr = hptr->next;
1383
1384                 assert ((hptr != NULL) && (hptr->next == NULL));
1385                 hptr->next = ph;
1386         }
1387
1388         ping_set_ttl (ph, obj->ttl);
1389
1390         return (0);
1391 } /* int ping_host_add */
1392
1393 int ping_host_remove (pingobj_t *obj, const char *host)
1394 {
1395         pinghost_t *pre, *cur;
1396
1397         pre = NULL;
1398         cur = obj->head;
1399
1400         while (cur != NULL)
1401         {
1402                 if (strcasecmp (host, cur->username) == 0)
1403                         break;
1404
1405                 pre = cur;
1406                 cur = cur->next;
1407         }
1408
1409         if (cur == NULL)
1410         {
1411                 ping_set_error (obj, "ping_host_remove", "Host not found");
1412                 return (-1);
1413         }
1414
1415         if (pre == NULL)
1416                 obj->head = cur->next;
1417         else
1418                 pre->next = cur->next;
1419
1420         ping_free (cur);
1421
1422         return (0);
1423 }
1424
1425 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1426 {
1427         return ((pingobj_iter_t *) obj->head);
1428 }
1429
1430 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1431 {
1432         return ((pingobj_iter_t *) iter->next);
1433 }
1434
1435 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1436                 void *buffer, size_t *buffer_len)
1437 {
1438         int ret = EINVAL;
1439
1440         size_t orig_buffer_len = *buffer_len;
1441
1442         switch (info)
1443         {
1444                 case PING_INFO_USERNAME:
1445                         ret = ENOMEM;
1446                         *buffer_len = strlen (iter->username) + 1;
1447                         if (orig_buffer_len <= *buffer_len)
1448                                 break;
1449                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1450                          * will copy `*buffer_len' and pad the rest of
1451                          * `buffer' with null-bytes */
1452                         strncpy (buffer, iter->username, orig_buffer_len);
1453                         ret = 0;
1454                         break;
1455
1456                 case PING_INFO_HOSTNAME:
1457                         ret = ENOMEM;
1458                         *buffer_len = strlen (iter->hostname) + 1;
1459                         if (orig_buffer_len < *buffer_len)
1460                                 break;
1461                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1462                          * will copy `*buffer_len' and pad the rest of
1463                          * `buffer' with null-bytes */
1464                         strncpy (buffer, iter->hostname, orig_buffer_len);
1465                         ret = 0;
1466                         break;
1467
1468                 case PING_INFO_ADDRESS:
1469                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1470                                         iter->addrlen,
1471                                         (char *) buffer,
1472                                         *buffer_len,
1473                                         NULL, 0,
1474                                         NI_NUMERICHOST);
1475                         if (ret != 0)
1476                         {
1477                                 if ((ret == EAI_MEMORY)
1478 #ifdef EAI_OVERFLOW
1479                                                 || (ret == EAI_OVERFLOW)
1480 #endif
1481                                    )
1482                                         ret = ENOMEM;
1483 #if defined(EAI_SYSTEM)
1484                                 else if (ret == EAI_SYSTEM)
1485                                         ret = errno;
1486 #endif
1487                                 else
1488                                         ret = EINVAL;
1489                         }
1490                         break;
1491
1492                 case PING_INFO_FAMILY:
1493                         ret = ENOMEM;
1494                         *buffer_len = sizeof (int);
1495                         if (orig_buffer_len < sizeof (int))
1496                                 break;
1497                         *((int *) buffer) = iter->addrfamily;
1498                         ret = 0;
1499                         break;
1500
1501                 case PING_INFO_LATENCY:
1502                         ret = ENOMEM;
1503                         *buffer_len = sizeof (double);
1504                         if (orig_buffer_len < sizeof (double))
1505                                 break;
1506                         *((double *) buffer) = iter->latency;
1507                         ret = 0;
1508                         break;
1509
1510                 case PING_INFO_DROPPED:
1511                         ret = ENOMEM;
1512                         *buffer_len = sizeof (uint32_t);
1513                         if (orig_buffer_len < sizeof (uint32_t))
1514                                 break;
1515                         *((uint32_t *) buffer) = iter->dropped;
1516                         ret = 0;
1517                         break;
1518
1519                 case PING_INFO_SEQUENCE:
1520                         ret = ENOMEM;
1521                         *buffer_len = sizeof (unsigned int);
1522                         if (orig_buffer_len < sizeof (unsigned int))
1523                                 break;
1524                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1525                         ret = 0;
1526                         break;
1527
1528                 case PING_INFO_IDENT:
1529                         ret = ENOMEM;
1530                         *buffer_len = sizeof (uint16_t);
1531                         if (orig_buffer_len < sizeof (uint16_t))
1532                                 break;
1533                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1534                         ret = 0;
1535                         break;
1536
1537                 case PING_INFO_DATA:
1538                         ret = ENOMEM;
1539                         *buffer_len = strlen (iter->data);
1540                         if (orig_buffer_len < *buffer_len)
1541                                 break;
1542                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1543                         ret = 0;
1544                         break;
1545
1546                 case PING_INFO_RECV_TTL:
1547                         ret = ENOMEM;
1548                         *buffer_len = sizeof (int);
1549                         if (orig_buffer_len < sizeof (int))
1550                                 break;
1551                         *((int *) buffer) = iter->recv_ttl;
1552                         ret = 0;
1553                         break;
1554         }
1555
1556         return (ret);
1557 } /* ping_iterator_get_info */
1558
1559 void *ping_iterator_get_context (pingobj_iter_t *iter)
1560 {
1561         return (iter->context);
1562 }
1563
1564 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1565 {
1566         iter->context = context;
1567 }