src/liboping.c

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