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