src/liboping.c

   1 /**
   2  * Object oriented C module to send ICMP and ICMPv6 `echo's.
   3  * Copyright (C) 2006-2016  Florian octo Forster <ff at octo.it>
   4  *
   5  * This library is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU Lesser General Public License as published by the
   7  * Free Software Foundation; either version 2.1 of the License, or (at your
   8  * option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
  13  * for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public License
  16  * along with this library; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19
  20 #ifdef __APPLE__
  21 #define __APPLE_USE_RFC_3542
  22 #endif
  23
  24 #if HAVE_CONFIG_H
  25 # include <config.h>
  26 #endif
  27
  28 #if STDC_HEADERS
  29 # include <stdlib.h>
  30 # include <stdio.h>
  31 # include <string.h>
  32 # include <inttypes.h>
  33 # include <errno.h>
  34 # include <assert.h>
  35 #else
  36 # error "You don't have the standard C99 header files installed"
  37 #endif /* STDC_HEADERS */
  38
  39 #ifdef HAVE_STDINT_H
  40 # include <stdint.h>
  41 #endif
  42
  43 #if HAVE_UNISTD_H
  44 # include <unistd.h>
  45 #endif
  46
  47 #if HAVE_FCNTL_H
  48 # include <fcntl.h>
  49 #endif
  50 #if HAVE_SYS_TYPES_H
  51 # include <sys/types.h>
  52 #endif
  53 #if HAVE_SYS_STAT_H
  54 # include <sys/stat.h>
  55 #endif
  56
  57 #if TIME_WITH_SYS_TIME
  58 # include <sys/time.h>
  59 # include <time.h>
  60 #else
  61 # if HAVE_SYS_TIME_H
  62 #  include <sys/time.h>
  63 # else
  64 #  include <time.h>
  65 # endif
  66 #endif
  67
  68 #if HAVE_SYS_SOCKET_H
  69 # include <sys/socket.h>
  70 #endif
  71
  72 #if HAVE_NETDB_H
  73 # include <netdb.h>
  74 #endif
  75
  76 #if HAVE_NETINET_IN_SYSTM_H
  77 # include <netinet/in_systm.h>
  78 #endif
  79 #if HAVE_NETINET_IN_H
  80 # include <netinet/in.h>
  81 #endif
  82 #if HAVE_NETINET_IP_H
  83 # include <netinet/ip.h>
  84 #endif
  85 #if HAVE_NETINET_IP_ICMP_H
  86 # include <netinet/ip_icmp.h>
  87 #endif
  88 #ifdef HAVE_NETINET_IP_VAR_H
  89 # include <netinet/ip_var.h>
  90 #endif
  91 #if HAVE_NETINET_IP6_H
  92 # include <netinet/ip6.h>
  93 #endif
  94 #if HAVE_NETINET_ICMP6_H
  95 # include <netinet/icmp6.h>
  96 #endif
  97
  98 #include "oping.h"
  99
 100 #if WITH_DEBUG
 101 # define dprintf(...) printf ("%s[%4i]: %-20s: ", __FILE__, __LINE__, __FUNCTION__); printf (__VA_ARGS__)
 102 #else
 103 # define dprintf(...) /**/
 104 #endif
 105
 106 #define PING_ERRMSG_LEN 256
 107
 108 struct pinghost
 109 {
 110         /* username: name passed in by the user */
 111         char                    *username;
 112         /* hostname: name returned by the reverse lookup */
 113         char                    *hostname;
 114         struct sockaddr_storage *addr;
 115         socklen_t                addrlen;
 116         int                      addrfamily;
 117         int                      fd;
 118         int                      ident;
 119         int                      sequence;
 120         struct timeval          *timer;
 121         double                   latency;
 122         uint32_t                 dropped;
 123         int                      recv_ttl;
 124         uint8_t                  recv_qos;
 125         char                    *data;
 126
 127         void                    *context;
 128
 129         struct pinghost         *next;
 130 };
 131
 132 struct pingobj
 133 {
 134         double                   timeout;
 135         int                      ttl;
 136         int                      addrfamily;
 137         uint8_t                  qos;
 138         char                    *data;
 139
 140         struct sockaddr         *srcaddr;
 141         socklen_t                srcaddrlen;
 142
 143         char                    *device;
 144
 145         char                    set_mark;
 146         int                     mark;
 147
 148         char                     errmsg[PING_ERRMSG_LEN];
 149
 150         pinghost_t              *head;
 151 };
 152
 153 /*
 154  * private (static) functions
 155  */
 156 /* Even though Posix requires "strerror_r" to return an "int",
 157  * some systems (e.g. the GNU libc) return a "char *" _and_
 158  * ignore the second argument ... -tokkee */
 159 static char *sstrerror (int errnum, char *buf, size_t buflen)
 160 {
 161         buf[0] = 0;
 162
 163 #if !HAVE_STRERROR_R
 164         {
 165                 snprintf (buf, buflen, "Error %i (%#x)", errnum, errnum);
 166         }
 167 /* #endif !HAVE_STRERROR_R */
 168
 169 #elif STRERROR_R_CHAR_P
 170         {
 171                 char *temp;
 172                 temp = strerror_r (errnum, buf, buflen);
 173                 if (buf[0] == 0)
 174                 {
 175                         if ((temp != NULL) && (temp != buf) && (temp[0] != 0))
 176                                 strncpy (buf, temp, buflen);
 177                         else
 178                                 strncpy (buf, "strerror_r did not return "
 179                                                 "an error message", buflen);
 180                 }
 181         }
 182 /* #endif STRERROR_R_CHAR_P */
 183
 184 #else
 185         if (strerror_r (errnum, buf, buflen) != 0)
 186         {
 187                 snprintf (buf, buflen, "Error %i (%#x); "
 188                                 "Additionally, strerror_r failed.",
 189                                 errnum, errnum);
 190         }
 191 #endif /* STRERROR_R_CHAR_P */
 192
 193         buf[buflen - 1] = 0;
 194
 195         return (buf);
 196 } /* char *sstrerror */
 197
 198 static void ping_set_error (pingobj_t *obj, const char *function,
 199                 const char *message)
 200 {
 201         snprintf (obj->errmsg, sizeof (obj->errmsg),
 202                         "%s: %s", function, message);
 203         obj->errmsg[sizeof (obj->errmsg) - 1] = 0;
 204 }
 205
 206 static void ping_set_errno (pingobj_t *obj, int error_number)
 207 {
 208         sstrerror (error_number, obj->errmsg, sizeof (obj->errmsg));
 209 }
 210
 211 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
 212                 struct timeval *res)
 213 {
 214         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
 215         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
 216
 217         while (res->tv_usec > 1000000)
 218         {
 219                 res->tv_usec -= 1000000;
 220                 res->tv_sec++;
 221         }
 222
 223         return (0);
 224 }
 225
 226 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
 227                 struct timeval *res)
 228 {
 229         if ((tv1->tv_sec < tv2->tv_sec)
 230                         || ((tv1->tv_sec == tv2->tv_sec)
 231                                 && (tv1->tv_usec < tv2->tv_usec)))
 232                 return (-1);
 233
 234         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
 235         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
 236
 237         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec >= 0)));
 238
 239         while (res->tv_usec < 0)
 240         {
 241                 res->tv_usec += 1000000;
 242                 res->tv_sec--;
 243         }
 244
 245         return (0);
 246 }
 247
 248 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
 249 {
 250         uint32_t sum = 0;
 251         uint16_t ret = 0;
 252
 253         uint16_t *ptr;
 254
 255         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
 256                 sum += *ptr;
 257
 258         if (len == 1)
 259         {
 260                 *(char *) &ret = *(char *) ptr;
 261                 sum += ret;
 262         }
 263
 264         /* Do this twice to get all possible carries.. */
 265         sum = (sum >> 16) + (sum & 0xFFFF);
 266         sum = (sum >> 16) + (sum & 0xFFFF);
 267
 268         ret = ~sum;
 269
 270         return (ret);
 271 }
 272
 273 static pinghost_t *ping_receive_ipv4 (pingobj_t *obj, char *buffer,
 274                 size_t buffer_len)
 275 {
 276         struct ip *ip_hdr;
 277         struct icmp *icmp_hdr;
 278
 279         size_t ip_hdr_len;
 280
 281         uint16_t recv_checksum;
 282         uint16_t calc_checksum;
 283
 284         uint16_t ident;
 285         uint16_t seq;
 286
 287         pinghost_t *ptr;
 288
 289         if (buffer_len < sizeof (struct ip))
 290                 return (NULL);
 291
 292         ip_hdr     = (struct ip *) buffer;
 293         ip_hdr_len = ip_hdr->ip_hl << 2;
 294
 295         if (buffer_len < ip_hdr_len)
 296                 return (NULL);
 297
 298         buffer     += ip_hdr_len;
 299         buffer_len -= ip_hdr_len;
 300
 301         if (buffer_len < ICMP_MINLEN)
 302                 return (NULL);
 303
 304         icmp_hdr = (struct icmp *) buffer;
 305         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
 306         {
 307                 dprintf ("Unexpected ICMP type: %"PRIu8"\n", icmp_hdr->icmp_type);
 308                 return (NULL);
 309         }
 310
 311         recv_checksum = icmp_hdr->icmp_cksum;
 312         /* This writes to buffer. */
 313         icmp_hdr->icmp_cksum = 0;
 314         calc_checksum = ping_icmp4_checksum (buffer, buffer_len);
 315
 316         if (recv_checksum != calc_checksum)
 317         {
 318                 dprintf ("Checksum missmatch: Got 0x%04"PRIx16", "
 319                                 "calculated 0x%04"PRIx16"\n",
 320                                 recv_checksum, calc_checksum);
 321                 return (NULL);
 322         }
 323
 324         ident = ntohs (icmp_hdr->icmp_id);
 325         seq   = ntohs (icmp_hdr->icmp_seq);
 326
 327         /* We have to iterate over all hosts, since ICMPv4 packets may
 328          * be received on any raw v4 socket. */
 329         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 330         {
 331                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 332                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 333
 334                 if (ptr->addrfamily != AF_INET)
 335                         continue;
 336
 337                 if (!timerisset (ptr->timer))
 338                         continue;
 339
 340                 if (ptr->ident != ident)
 341                         continue;
 342
 343                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 344                         continue;
 345
 346                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
 347                                 "seq = %"PRIu16"\n",
 348                                 ptr->hostname, ident, seq);
 349
 350                 break;
 351         }
 352
 353         if (ptr == NULL)
 354         {
 355                 dprintf ("No match found for ident = 0x%04"PRIx16", seq = %"PRIu16"\n",
 356                                 ident, seq);
 357         }
 358
 359         if (ptr != NULL){
 360                 ptr->recv_ttl = (int)     ip_hdr->ip_ttl;
 361                 ptr->recv_qos = (uint8_t) ip_hdr->ip_tos;
 362         }
 363         return (ptr);
 364 }
 365
 366 #ifndef ICMP6_ECHO_REQUEST
 367 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
 368 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
 369 # else
 370 #  define ICMP6_ECHO_REQUEST 128
 371 # endif
 372 #endif
 373
 374 #ifndef ICMP6_ECHO_REPLY
 375 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
 376 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
 377 # else
 378 #  define ICMP6_ECHO_REPLY 129
 379 # endif
 380 #endif
 381
 382 static pinghost_t *ping_receive_ipv6 (pingobj_t *obj, char *buffer,
 383                 size_t buffer_len)
 384 {
 385         struct icmp6_hdr *icmp_hdr;
 386
 387         uint16_t ident;
 388         uint16_t seq;
 389
 390         pinghost_t *ptr;
 391
 392         if (buffer_len < ICMP_MINLEN)
 393                 return (NULL);
 394
 395         icmp_hdr = (struct icmp6_hdr *) buffer;
 396         buffer     += ICMP_MINLEN;
 397         buffer_len -= ICMP_MINLEN;
 398
 399         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 400         {
 401                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 402                 return (NULL);
 403         }
 404
 405         if (icmp_hdr->icmp6_code != 0)
 406         {
 407                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 408                 return (NULL);
 409         }
 410
 411         ident = ntohs (icmp_hdr->icmp6_id);
 412         seq   = ntohs (icmp_hdr->icmp6_seq);
 413
 414         /* We have to iterate over all hosts, since ICMPv6 packets may
 415          * be received on any raw v6 socket. */
 416         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 417         {
 418                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 419                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 420
 421                 if (ptr->addrfamily != AF_INET6)
 422                         continue;
 423
 424                 if (!timerisset (ptr->timer))
 425                         continue;
 426
 427                 if (ptr->ident != ident)
 428                         continue;
 429
 430                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 431                         continue;
 432
 433                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
 434                                 "seq = %"PRIu16"\n",
 435                                 ptr->hostname, ident, seq);
 436
 437                 break;
 438         }
 439
 440         if (ptr == NULL)
 441         {
 442                 dprintf ("No match found for ident = 0x%04"PRIx16", "
 443                                 "seq = %"PRIu16"\n",
 444                                 ident, seq);
 445         }
 446
 447         return (ptr);
 448 }
 449
 450 static int ping_receive_one (pingobj_t *obj, const pinghost_t *ph,
 451                 struct timeval *now)
 452 {
 453         /* Note: 'ph' is not necessarily the host object for which we receive a
 454          * reply. The right object will be returned by ping_receive_ipv*(). For
 455          * now, we can only rely on ph->fd and ph->addrfamily. */
 456
 457         struct timeval diff, pkt_now = *now;
 458         pinghost_t *host = NULL;
 459         int recv_ttl;
 460         uint8_t recv_qos;
 461
 462         /*
 463          * Set up the receive buffer..
 464          */
 465         struct msghdr msghdr;
 466         struct cmsghdr *cmsg;
 467         char payload_buffer[4096];
 468         ssize_t payload_buffer_len;
 469         char control_buffer[4096];
 470         struct iovec payload_iovec;
 471
 472         memset (&payload_iovec, 0, sizeof (payload_iovec));
 473         payload_iovec.iov_base = payload_buffer;
 474         payload_iovec.iov_len = sizeof (payload_buffer);
 475
 476         memset (&msghdr, 0, sizeof (msghdr));
 477         /* unspecified source address */
 478         msghdr.msg_name = NULL;
 479         msghdr.msg_namelen = 0;
 480         /* output buffer vector, see readv(2) */
 481         msghdr.msg_iov = &payload_iovec;
 482         msghdr.msg_iovlen = 1;
 483         /* output buffer for control messages */
 484         msghdr.msg_control = control_buffer;
 485         msghdr.msg_controllen = sizeof (control_buffer);
 486         /* flags; this is an output only field.. */
 487         msghdr.msg_flags = 0;
 488 #ifdef MSG_XPG4_2
 489         msghdr.msg_flags |= MSG_XPG4_2;
 490 #endif
 491
 492         payload_buffer_len = recvmsg (ph->fd, &msghdr, /* flags = */ 0);
 493         if (payload_buffer_len < 0)
 494         {
 495 #if WITH_DEBUG
 496                 char errbuf[PING_ERRMSG_LEN];
 497                 dprintf ("recvfrom: %s\n",
 498                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 499 #endif
 500                 return (-1);
 501         }
 502         dprintf ("Read %zi bytes from fd = %i\n", payload_buffer_len, ph->fd);
 503
 504         /* Iterate over all auxiliary data in msghdr */
 505         recv_ttl = -1;
 506         recv_qos = 0;
 507         for (cmsg = CMSG_FIRSTHDR (&msghdr); /* {{{ */
 508                         cmsg != NULL;
 509                         cmsg = CMSG_NXTHDR (&msghdr, cmsg))
 510         {
 511                 if (cmsg->cmsg_level == SOL_SOCKET)
 512                 {
 513 #ifdef SO_TIMESTAMP
 514                         if (cmsg->cmsg_type == SO_TIMESTAMP)
 515                                 memcpy (&pkt_now, CMSG_DATA (cmsg), sizeof (pkt_now));
 516 #endif /* SO_TIMESTAMP */
 517                 }
 518                 else if (ph->addrfamily == AF_INET) /* {{{ */
 519                 {
 520                         if (cmsg->cmsg_level != IPPROTO_IP)
 521                                 continue;
 522
 523                         if (cmsg->cmsg_type == IP_TOS)
 524                         {
 525                                 memcpy (&recv_qos, CMSG_DATA (cmsg),
 526                                                 sizeof (recv_qos));
 527                                 dprintf ("TOSv4 = 0x%02"PRIx8";\n", recv_qos);
 528                         } else
 529                         if (cmsg->cmsg_type == IP_TTL)
 530                         {
 531                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 532                                                 sizeof (recv_ttl));
 533                                 dprintf ("TTLv4 = %i;\n", recv_ttl);
 534                         }
 535                         else
 536                         {
 537                                 dprintf ("Not handling option %i.\n",
 538                                                 cmsg->cmsg_type);
 539                         }
 540                 } /* }}} */
 541                 else if (ph->addrfamily == AF_INET6) /* {{{ */
 542                 {
 543                         if (cmsg->cmsg_level != IPPROTO_IPV6)
 544                                 continue;
 545
 546                         if (cmsg->cmsg_type == IPV6_TCLASS)
 547                         {
 548                                 memcpy (&recv_qos, CMSG_DATA (cmsg),
 549                                                 sizeof (recv_qos));
 550                                 dprintf ("TOSv6 = 0x%02"PRIx8";\n", recv_qos);
 551                         } else
 552 #ifdef IPV6_HOPLIMIT
 553                         if (cmsg->cmsg_type == IPV6_HOPLIMIT)
 554                         {
 555                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 556                                                 sizeof (recv_ttl));
 557                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 558                         }
 559                         else
 560 #endif
 561 #ifdef IPV6_UNICAST_HOPS
 562                         if (cmsg->cmsg_type == IPV6_UNICAST_HOPS)
 563                         {
 564                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 565                                                 sizeof (recv_ttl));
 566                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 567                         }
 568                         else
 569 #endif
 570 #ifdef IPV6_MULTICAST_HOPS
 571                         if (cmsg->cmsg_type == IPV6_MULTICAST_HOPS)
 572                         {
 573                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 574                                                 sizeof (recv_ttl));
 575                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 576                         }
 577                         else
 578 #endif
 579                         {
 580                                 dprintf ("Not handling option %i.\n",
 581                                                 cmsg->cmsg_type);
 582                         }
 583                 } /* }}} */
 584                 else
 585                 {
 586                         dprintf ("Don't know how to handle "
 587                                         "unknown protocol %i.\n",
 588                                         cmsg->cmsg_level);
 589                 }
 590         } /* }}} for (cmsg) */
 591
 592         if (ph->addrfamily == AF_INET)
 593         {
 594                 host = ping_receive_ipv4 (obj, payload_buffer, payload_buffer_len);
 595                 if (host == NULL)
 596                         return (-1);
 597         }
 598         else if (ph->addrfamily == AF_INET6)
 599         {
 600                 host = ping_receive_ipv6 (obj, payload_buffer, payload_buffer_len);
 601                 if (host == NULL)
 602                         return (-1);
 603         }
 604         else
 605         {
 606                 dprintf ("ping_receive_one: Unknown address family %i.\n",
 607                                 ph->addrfamily);
 608                 return (-1);
 609         }
 610
 611         dprintf ("rcvd: %12i.%06i\n",
 612                         (int) pkt_now.tv_sec,
 613                         (int) pkt_now.tv_usec);
 614         dprintf ("sent: %12i.%06i\n",
 615                         (int) host->timer->tv_sec,
 616                         (int) host->timer->tv_usec);
 617
 618         if (ping_timeval_sub (&pkt_now, host->timer, &diff) < 0)
 619         {
 620                 timerclear (host->timer);
 621                 return (-1);
 622         }
 623
 624         dprintf ("diff: %12i.%06i\n",
 625                         (int) diff.tv_sec,
 626                         (int) diff.tv_usec);
 627
 628         if (recv_ttl >= 0)
 629                 host->recv_ttl = recv_ttl;
 630         host->recv_qos = recv_qos;
 631
 632         host->latency  = ((double) diff.tv_usec) / 1000.0;
 633         host->latency += ((double) diff.tv_sec)  * 1000.0;
 634
 635         timerclear (host->timer);
 636
 637         return (0);
 638 }
 639
 640 /* Blocks until a packet was received from all hosts or the timeout is reached.
 641  * When interrupted, (-EINTR) is returned. On error, -1 is returned. On
 642  * success, returns zero. */
 643 static int ping_receive_all (pingobj_t *obj)
 644 {
 645         fd_set read_fds;
 646         fd_set err_fds;
 647         int num_fds;
 648         int max_fd;
 649
 650         pinghost_t *ph;
 651         pinghost_t *ptr;
 652
 653         struct timeval endtime;
 654         struct timeval nowtime;
 655         struct timeval timeout;
 656         int status;
 657
 658         int ret;
 659
 660         ph = obj->head;
 661         ret = 0;
 662
 663         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 664         {
 665                 ptr->latency  = -1.0;
 666                 ptr->recv_ttl = -1;
 667         }
 668
 669         if (gettimeofday (&nowtime, NULL) == -1)
 670         {
 671                 ping_set_errno (obj, errno);
 672                 return (-1);
 673         }
 674
 675         /* Set up timeout */
 676         timeout.tv_sec = (time_t) obj->timeout;
 677         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 678
 679         dprintf ("Set timeout to %i.%06i seconds\n",
 680                         (int) timeout.tv_sec,
 681                         (int) timeout.tv_usec);
 682
 683         ping_timeval_add (&nowtime, &timeout, &endtime);
 684
 685         while (1)
 686         {
 687                 FD_ZERO (&read_fds);
 688                 FD_ZERO (&err_fds);
 689                 num_fds =  0;
 690                 max_fd = -1;
 691
 692                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 693                 {
 694                         if (!timerisset (ptr->timer))
 695                                 continue;
 696
 697                         assert (ptr->fd < FD_SETSIZE);
 698                         FD_SET (ptr->fd, &read_fds);
 699                         FD_SET (ptr->fd, &err_fds);
 700                         num_fds++;
 701
 702                         if (max_fd < ptr->fd)
 703                                 max_fd = ptr->fd;
 704                 }
 705
 706                 if (num_fds == 0)
 707                         break;
 708
 709                 if (gettimeofday (&nowtime, NULL) == -1)
 710                 {
 711                         ping_set_errno (obj, errno);
 712                         return (-1);
 713                 }
 714
 715                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 716                         break;
 717
 718                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_fds,
 719                                 (int) timeout.tv_sec,
 720                                 (int) timeout.tv_usec);
 721
 722                 status = select (max_fd + 1, &read_fds, NULL, &err_fds, &timeout);
 723
 724                 if (gettimeofday (&nowtime, NULL) == -1)
 725                 {
 726                         ping_set_errno (obj, errno);
 727                         return (-1);
 728                 }
 729
 730                 if ((status == -1) && (errno == EINTR))
 731                 {
 732                         dprintf ("select was interrupted by signal..\n");
 733                         ping_set_errno (obj, EINTR);
 734                         return (-EINTR);
 735                 }
 736                 else if (status < 0)
 737                 {
 738 #if WITH_DEBUG
 739                         char errbuf[PING_ERRMSG_LEN];
 740                         dprintf ("select: %s\n",
 741                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 742 #endif
 743                         break;
 744                 }
 745                 else if (status == 0)
 746                 {
 747                         dprintf ("select timed out\n");
 748                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 749                                 if (ptr->latency < 0.0)
 750                                         ptr->dropped++;
 751                         break;
 752                 }
 753
 754                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 755                 {
 756                         if (FD_ISSET (ptr->fd, &read_fds))
 757                         {
 758                                 if (ping_receive_one (obj, ptr, &nowtime) == 0)
 759                                         ret++;
 760                         }
 761                         else if (FD_ISSET (ptr->fd, &err_fds))
 762                         {
 763                                 /* clear the timer in this case so that we
 764                                  * don't run into an endless loop. */
 765                                 /* TODO: Set an error flag in this case. */
 766                                 timerclear (ptr->timer);
 767                         }
 768                 }
 769         } /* while (1) */
 770
 771         return (ret);
 772 } /* int ping_receive_all */
 773
 774 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 775  * Sending functions:                                                        *
 776  *                                                                           *
 777  * ping_send_all                                                             *
 778  * +-> ping_send_one_ipv4                                                    *
 779  * `-> ping_send_one_ipv6                                                    *
 780  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 781 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 782                 const void *buf, size_t buflen)
 783 {
 784         ssize_t ret;
 785
 786         if (gettimeofday (ph->timer, NULL) == -1)
 787         {
 788                 timerclear (ph->timer);
 789                 return (-1);
 790         }
 791
 792         ret = sendto (ph->fd, buf, buflen, 0,
 793                         (struct sockaddr *) ph->addr, ph->addrlen);
 794
 795         if (ret < 0)
 796         {
 797 #if defined(EHOSTUNREACH)
 798                 if (errno == EHOSTUNREACH)
 799                         return (0);
 800 #endif
 801 #if defined(ENETUNREACH)
 802                 if (errno == ENETUNREACH)
 803                         return (0);
 804 #endif
 805                 ping_set_errno (obj, errno);
 806         }
 807
 808         return (ret);
 809 }
 810
 811 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 812 {
 813         struct icmp *icmp4;
 814         int status;
 815
 816         char   buf[4096] = {0};
 817         size_t buflen;
 818
 819         char *data;
 820         size_t datalen;
 821
 822         dprintf ("ph->hostname = %s\n", ph->hostname);
 823
 824         icmp4 = (struct icmp *) buf;
 825         *icmp4 = (struct icmp) {
 826                 .icmp_type = ICMP_ECHO,
 827                 .icmp_id   = htons (ph->ident),
 828                 .icmp_seq  = htons (ph->sequence),
 829         };
 830
 831         datalen = strlen (ph->data);
 832         buflen = ICMP_MINLEN + datalen;
 833         if (sizeof (buf) < buflen)
 834                 return (EINVAL);
 835
 836         data  = buf + ICMP_MINLEN;
 837         memcpy (data, ph->data, datalen);
 838
 839         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 840
 841         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 842
 843         status = ping_sendto (obj, ph, buf, buflen);
 844         if (status < 0)
 845         {
 846                 perror ("ping_sendto");
 847                 return (-1);
 848         }
 849
 850         dprintf ("sendto: status = %i\n", status);
 851
 852         return (0);
 853 }
 854
 855 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 856 {
 857         struct icmp6_hdr *icmp6;
 858         int status;
 859
 860         char buf[4096] = {0};
 861         int  buflen;
 862
 863         char *data;
 864         int   datalen;
 865
 866         dprintf ("ph->hostname = %s\n", ph->hostname);
 867
 868         icmp6 = (struct icmp6_hdr *) buf;
 869         *icmp6 = (struct icmp6_hdr) {
 870                 .icmp6_type  = ICMP6_ECHO_REQUEST,
 871                 .icmp6_id    = htons (ph->ident),
 872                 .icmp6_seq   = htons (ph->sequence),
 873         };
 874
 875         datalen = strlen (ph->data);
 876         buflen = sizeof (*icmp6) + datalen;
 877         if (sizeof (buf) < buflen)
 878                 return (EINVAL);
 879
 880         data  = buf + ICMP_MINLEN;
 881         memcpy (data, ph->data, datalen);
 882
 883         /* The checksum will be calculated by the TCP/IP stack. */
 884
 885         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 886
 887         status = ping_sendto (obj, ph, buf, buflen);
 888         if (status < 0)
 889         {
 890                 perror ("ping_sendto");
 891                 return (-1);
 892         }
 893
 894         dprintf ("sendto: status = %i\n", status);
 895
 896         return (0);
 897 }
 898
 899 static int ping_send_all (pingobj_t *obj)
 900 {
 901         pinghost_t *ph;
 902         pinghost_t *ptr;
 903
 904         int ret;
 905
 906         ret = 0;
 907         ph = obj->head;
 908
 909         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 910         {
 911                 /* start timer.. The GNU `ping6' starts the timer before
 912                  * sending the packet, so I will do that too */
 913                 if (gettimeofday (ptr->timer, NULL) == -1)
 914                 {
 915 #if WITH_DEBUG
 916                         char errbuf[PING_ERRMSG_LEN];
 917                         dprintf ("gettimeofday: %s\n",
 918                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 919 #endif
 920                         timerclear (ptr->timer);
 921                         ret--;
 922                         continue;
 923                 }
 924                 else
 925                 {
 926                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 927                 }
 928
 929                 if (ptr->addrfamily == AF_INET6)
 930                 {
 931                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 932                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 933                         {
 934                                 timerclear (ptr->timer);
 935                                 ret--;
 936                                 continue;
 937                         }
 938                 }
 939                 else if (ptr->addrfamily == AF_INET)
 940                 {
 941                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 942                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 943                         {
 944                                 timerclear (ptr->timer);
 945                                 ret--;
 946                                 continue;
 947                         }
 948                 }
 949                 else /* this should not happen */
 950                 {
 951                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 952                         timerclear (ptr->timer);
 953                         ret--;
 954                         continue;
 955                 }
 956
 957                 ptr->sequence++;
 958         }
 959
 960         return (ret);
 961 }
 962
 963 /*
 964  * Set the TTL of a socket protocol independently.
 965  */
 966 static int ping_set_ttl (pinghost_t *ph, int ttl)
 967 {
 968         int ret = -2;
 969
 970         if (ph->addrfamily == AF_INET)
 971         {
 972                 dprintf ("Setting TTLv4 to %i\n", ttl);
 973                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL,
 974                                 &ttl, sizeof (ttl));
 975         }
 976         else if (ph->addrfamily == AF_INET6)
 977         {
 978                 dprintf ("Setting TTLv6 to %i\n", ttl);
 979                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
 980                                 &ttl, sizeof (ttl));
 981         }
 982
 983         return (ret);
 984 }
 985
 986 /*
 987  * Set the TOS of a socket protocol independently.
 988  *
 989  * Using SOL_SOCKET / SO_PRIORITY might be a protocol independent way to
 990  * set this. See socket(7) for details.
 991  */
 992 static int ping_set_qos (pingobj_t *obj, pinghost_t *ph, uint8_t qos)
 993 {
 994         int ret = EINVAL;
 995         char errbuf[PING_ERRMSG_LEN];
 996
 997         if (ph->addrfamily == AF_INET)
 998         {
 999                 dprintf ("Setting TP_TOS to %#04"PRIx8"\n", qos);
1000                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TOS,
1001                                 &qos, sizeof (qos));
1002                 if (ret != 0)
1003                 {
1004                         ret = errno;
1005                         ping_set_error (obj, "ping_set_qos",
1006                                         sstrerror (ret, errbuf, sizeof (errbuf)));
1007                         dprintf ("Setting TP_TOS failed: %s\n", errbuf);
1008                 }
1009         }
1010         else if (ph->addrfamily == AF_INET6)
1011         {
1012                 /* IPV6_TCLASS requires an "int". */
1013                 int tmp = (int) qos;
1014
1015                 dprintf ("Setting IPV6_TCLASS to %#04"PRIx8" (%i)\n", qos, tmp);
1016                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_TCLASS,
1017                                 &tmp, sizeof (tmp));
1018                 if (ret != 0)
1019                 {
1020                         ret = errno;
1021                         ping_set_error (obj, "ping_set_qos",
1022                                         sstrerror (ret, errbuf, sizeof (errbuf)));
1023                         dprintf ("Setting IPV6_TCLASS failed: %s\n", errbuf);
1024                 }
1025         }
1026
1027         return (ret);
1028 }
1029
1030 static int ping_get_ident (void)
1031 {
1032         int fd;
1033         static int did_seed = 0;
1034
1035         int retval;
1036
1037         if (did_seed == 0)
1038         {
1039                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
1040                 {
1041                         unsigned int seed;
1042
1043                         if (read (fd, &seed, sizeof (seed)) != -1)
1044                         {
1045                                 did_seed = 1;
1046                                 dprintf ("Random seed:   %#x\n", seed);
1047                                 srandom (seed);
1048                         }
1049
1050                         close (fd);
1051                 }
1052 #if WITH_DEBUG
1053                 else
1054                 {
1055                         char errbuf[PING_ERRMSG_LEN];
1056                         dprintf ("open (/dev/urandom): %s\n",
1057                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1058                 }
1059 #endif
1060         }
1061
1062         retval = (int) random ();
1063
1064         dprintf ("Random number: %#x\n", retval);
1065
1066         return (retval);
1067 }
1068
1069 static pinghost_t *ping_alloc (void)
1070 {
1071         pinghost_t *ph;
1072         size_t      ph_size;
1073
1074         ph_size = sizeof (pinghost_t)
1075                 + sizeof (struct sockaddr_storage)
1076                 + sizeof (struct timeval);
1077
1078         ph = (pinghost_t *) malloc (ph_size);
1079         if (ph == NULL)
1080                 return (NULL);
1081
1082         memset (ph, '\0', ph_size);
1083
1084         ph->timer   = (struct timeval *) (ph + 1);
1085         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
1086
1087         ph->addrlen = sizeof (struct sockaddr_storage);
1088         ph->fd      = -1;
1089         ph->latency = -1.0;
1090         ph->dropped = 0;
1091         ph->ident   = ping_get_ident () & 0xFFFF;
1092
1093         return (ph);
1094 }
1095
1096 static void ping_free (pinghost_t *ph)
1097 {
1098         if (ph->fd >= 0)
1099                 close (ph->fd);
1100
1101         if (ph->username != NULL)
1102                 free (ph->username);
1103
1104         if (ph->hostname != NULL)
1105                 free (ph->hostname);
1106
1107         if (ph->data != NULL)
1108                 free (ph->data);
1109
1110         free (ph);
1111 }
1112
1113 /*
1114  * public methods
1115  */
1116 const char *ping_get_error (pingobj_t *obj)
1117 {
1118         if (obj == NULL)
1119                 return (NULL);
1120         return (obj->errmsg);
1121 }
1122
1123 pingobj_t *ping_construct (void)
1124 {
1125         pingobj_t *obj;
1126
1127         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
1128                 return (NULL);
1129         memset (obj, 0, sizeof (pingobj_t));
1130
1131         obj->timeout    = PING_DEF_TIMEOUT;
1132         obj->ttl        = PING_DEF_TTL;
1133         obj->addrfamily = PING_DEF_AF;
1134         obj->data       = strdup (PING_DEF_DATA);
1135         obj->qos        = 0;
1136
1137         return (obj);
1138 }
1139
1140 void ping_destroy (pingobj_t *obj)
1141 {
1142         pinghost_t *current;
1143         pinghost_t *next;
1144
1145         if (obj == NULL)
1146                 return;
1147
1148         current = obj->head;
1149         next = NULL;
1150
1151         while (current != NULL)
1152         {
1153                 next = current->next;
1154                 ping_free (current);
1155                 current = next;
1156         }
1157
1158         if (obj->data != NULL)
1159                 free (obj->data);
1160
1161         if (obj->srcaddr != NULL)
1162                 free (obj->srcaddr);
1163
1164         if (obj->device != NULL)
1165                 free (obj->device);
1166
1167         free (obj);
1168
1169         return;
1170 }
1171
1172 int ping_setopt (pingobj_t *obj, int option, void *value)
1173 {
1174         int ret = 0;
1175
1176         if ((obj == NULL) || (value == NULL))
1177                 return (-1);
1178
1179         switch (option)
1180         {
1181                 case PING_OPT_QOS:
1182                 {
1183                         pinghost_t *ph;
1184
1185                         obj->qos = *((uint8_t *) value);
1186                         for (ph = obj->head; ph != NULL; ph = ph->next)
1187                                 ping_set_qos (obj, ph, obj->qos);
1188                         break;
1189                 }
1190
1191                 case PING_OPT_TIMEOUT:
1192                         obj->timeout = *((double *) value);
1193                         if (obj->timeout < 0.0)
1194                         {
1195                                 obj->timeout = PING_DEF_TIMEOUT;
1196                                 ret = -1;
1197                         }
1198                         break;
1199
1200                 case PING_OPT_TTL:
1201                         obj->ttl = *((int *) value);
1202                         if ((obj->ttl < 1) || (obj->ttl > 255))
1203                         {
1204                                 obj->ttl = PING_DEF_TTL;
1205                                 ret = -1;
1206                         }
1207                         else
1208                         {
1209                                 pinghost_t *ph;
1210
1211                                 for (ph = obj->head; ph != NULL; ph = ph->next)
1212                                         ping_set_ttl (ph, obj->ttl);
1213                         }
1214                         break;
1215
1216                 case PING_OPT_AF:
1217                         obj->addrfamily = *((int *) value);
1218                         if ((obj->addrfamily != AF_UNSPEC)
1219                                         && (obj->addrfamily != AF_INET)
1220                                         && (obj->addrfamily != AF_INET6))
1221                         {
1222                                 obj->addrfamily = PING_DEF_AF;
1223                                 ret = -1;
1224                         }
1225                         if (obj->srcaddr != NULL)
1226                         {
1227                                 free (obj->srcaddr);
1228                                 obj->srcaddr = NULL;
1229                         }
1230                         break;
1231
1232                 case PING_OPT_DATA:
1233                         if (obj->data != NULL)
1234                         {
1235                                 free (obj->data);
1236                                 obj->data = NULL;
1237                         }
1238                         obj->data = strdup ((const char *) value);
1239                         break;
1240
1241                 case PING_OPT_SOURCE:
1242                 {
1243                         char            *hostname = (char *) value;
1244                         struct addrinfo  ai_hints;
1245                         struct addrinfo *ai_list;
1246                         int              status;
1247 #if WITH_DEBUG
1248                         if (obj->addrfamily != AF_UNSPEC)
1249                         {
1250                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1251                         }
1252 #endif
1253                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1254                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1255 #if defined(AI_ADDRCONFIG)
1256                         ai_hints.ai_flags = AI_ADDRCONFIG;
1257 #endif
1258                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1259                         if (status != 0)
1260                         {
1261 #if defined(EAI_SYSTEM)
1262                                 char errbuf[PING_ERRMSG_LEN];
1263 #endif
1264                                 ping_set_error (obj, "getaddrinfo",
1265 #if defined(EAI_SYSTEM)
1266                                                 (status == EAI_SYSTEM)
1267                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1268 #endif
1269                                                 gai_strerror (status));
1270                                 ret = -1;
1271                                 break;
1272                         }
1273 #if WITH_DEBUG
1274                         if (ai_list->ai_next != NULL)
1275                         {
1276                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1277                         }
1278 #endif
1279                         if (obj->srcaddr == NULL)
1280                         {
1281                                 obj->srcaddrlen = 0;
1282                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1283                                 if (obj->srcaddr == NULL)
1284                                 {
1285                                         ping_set_errno (obj, errno);
1286                                         ret = -1;
1287                                         freeaddrinfo (ai_list);
1288                                         break;
1289                                 }
1290                         }
1291                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1292                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1293                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1294                                         ai_list->ai_addrlen);
1295                         obj->srcaddrlen = ai_list->ai_addrlen;
1296                         obj->addrfamily = ai_list->ai_family;
1297
1298                         freeaddrinfo (ai_list);
1299                 } /* case PING_OPT_SOURCE */
1300                 break;
1301
1302                 case PING_OPT_DEVICE:
1303                 {
1304 #ifdef SO_BINDTODEVICE
1305                         char *device = strdup ((char *) value);
1306
1307                         if (device == NULL)
1308                         {
1309                                 ping_set_errno (obj, errno);
1310                                 ret = -1;
1311                                 break;
1312                         }
1313
1314                         if (obj->device != NULL)
1315                                 free (obj->device);
1316                         obj->device = device;
1317 #else /* ! SO_BINDTODEVICE */
1318                         ping_set_errno (obj, ENOTSUP);
1319                         ret = -1;
1320 #endif /* ! SO_BINDTODEVICE */
1321                 } /* case PING_OPT_DEVICE */
1322                 break;
1323
1324                 case PING_OPT_MARK:
1325                 {
1326 #ifdef SO_MARK
1327                         obj->mark     = *(int*)(value);
1328                         obj->set_mark = 1;
1329 #else /* SO_MARK */
1330                         ping_set_errno (obj, ENOTSUP);
1331                         ret = -1;
1332 #endif /* !SO_MARK */
1333
1334                 } /* case PING_OPT_MARK */
1335                 break;
1336
1337                 default:
1338                         ret = -2;
1339         } /* switch (option) */
1340
1341         return (ret);
1342 } /* int ping_setopt */
1343
1344
1345 int ping_send (pingobj_t *obj)
1346 {
1347         if (obj == NULL)
1348                 return (-1);
1349
1350         if (ping_send_all (obj) < 0)
1351                 return (-1);
1352
1353         return (ping_receive_all (obj));
1354 }
1355
1356 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1357 {
1358         while (ph != NULL)
1359         {
1360                 if (strcasecmp (ph->username, host) == 0)
1361                         break;
1362
1363                 ph = ph->next;
1364         }
1365
1366         return (ph);
1367 }
1368
1369 int ping_host_add (pingobj_t *obj, const char *host)
1370 {
1371         pinghost_t *ph;
1372
1373         struct addrinfo  ai_hints;
1374         struct addrinfo *ai_list, *ai_ptr;
1375         int              ai_return;
1376
1377         if ((obj == NULL) || (host == NULL))
1378                 return (-1);
1379
1380         dprintf ("host = %s\n", host);
1381
1382         if (ping_host_search (obj->head, host) != NULL)
1383                 return (0);
1384
1385         memset (&ai_hints, '\0', sizeof (ai_hints));
1386         ai_hints.ai_flags     = 0;
1387 #ifdef AI_ADDRCONFIG
1388         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1389 #endif
1390 #ifdef AI_CANONNAME
1391         ai_hints.ai_flags    |= AI_CANONNAME;
1392 #endif
1393         ai_hints.ai_family    = obj->addrfamily;
1394         ai_hints.ai_socktype  = SOCK_RAW;
1395
1396         if ((ph = ping_alloc ()) == NULL)
1397         {
1398                 dprintf ("Out of memory!\n");
1399                 return (-1);
1400         }
1401
1402         if ((ph->username = strdup (host)) == NULL)
1403         {
1404                 dprintf ("Out of memory!\n");
1405                 ping_set_errno (obj, errno);
1406                 ping_free (ph);
1407                 return (-1);
1408         }
1409
1410         if ((ph->hostname = strdup (host)) == NULL)
1411         {
1412                 dprintf ("Out of memory!\n");
1413                 ping_set_errno (obj, errno);
1414                 ping_free (ph);
1415                 return (-1);
1416         }
1417
1418         /* obj->data is not garuanteed to be != NULL */
1419         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1420         {
1421                 dprintf ("Out of memory!\n");
1422                 ping_set_errno (obj, errno);
1423                 ping_free (ph);
1424                 return (-1);
1425         }
1426
1427         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1428         {
1429 #if defined(EAI_SYSTEM)
1430                 char errbuf[PING_ERRMSG_LEN];
1431 #endif
1432                 dprintf ("getaddrinfo failed\n");
1433                 ping_set_error (obj, "getaddrinfo",
1434 #if defined(EAI_SYSTEM)
1435                                                 (ai_return == EAI_SYSTEM)
1436                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1437 #endif
1438                                 gai_strerror (ai_return));
1439                 ping_free (ph);
1440                 return (-1);
1441         }
1442
1443         if (ai_list == NULL)
1444                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1445
1446         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1447         {
1448                 ph->fd = -1;
1449
1450                 if (ai_ptr->ai_family == AF_INET)
1451                 {
1452                         ai_ptr->ai_socktype = SOCK_RAW;
1453                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1454                 }
1455                 else if (ai_ptr->ai_family == AF_INET6)
1456                 {
1457                         ai_ptr->ai_socktype = SOCK_RAW;
1458                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1459                 }
1460                 else
1461                 {
1462                         char errmsg[PING_ERRMSG_LEN];
1463
1464                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1465                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1466
1467                         dprintf ("%s", errmsg);
1468                         ping_set_error (obj, "getaddrinfo", errmsg);
1469                         continue;
1470                 }
1471
1472                 /* TODO: Move this to a static function `ping_open_socket' and
1473                  * call it whenever the socket dies. */
1474                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1475                 if (ph->fd == -1)
1476                 {
1477 #if WITH_DEBUG
1478                         char errbuf[PING_ERRMSG_LEN];
1479                         dprintf ("socket: %s\n",
1480                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1481 #endif
1482                         ping_set_errno (obj, errno);
1483                         continue;
1484                 }
1485                 else if (ph->fd >= FD_SETSIZE)
1486                 {
1487                         dprintf("socket(2) returned file descriptor %d, which is above the file "
1488                                 "descriptor limit for select(2) (FD_SETSIZE = %d)\n",
1489                                 ph->fd, FD_SETSIZE);
1490                         close(ph->fd);
1491                         ph->fd = -1;
1492                         ping_set_errno(obj, EMFILE);
1493                         continue;
1494                 }
1495
1496                 if (obj->srcaddr != NULL)
1497                 {
1498                         assert (obj->srcaddrlen > 0);
1499                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1500
1501                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1502                         {
1503 #if WITH_DEBUG
1504                                 char errbuf[PING_ERRMSG_LEN];
1505                                 dprintf ("bind: %s\n",
1506                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1507 #endif
1508                                 ping_set_errno (obj, errno);
1509                                 close (ph->fd);
1510                                 ph->fd = -1;
1511                                 continue;
1512                         }
1513                 }
1514
1515 #ifdef SO_BINDTODEVICE
1516                 if (obj->device != NULL)
1517                 {
1518                         if (setsockopt (ph->fd, SOL_SOCKET, SO_BINDTODEVICE,
1519                                         obj->device, strlen (obj->device) + 1) != 0)
1520                         {
1521 #if WITH_DEBUG
1522                                 char errbuf[PING_ERRMSG_LEN];
1523                                 dprintf ("setsockopt (SO_BINDTODEVICE): %s\n",
1524                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1525 #endif
1526                                 ping_set_errno (obj, errno);
1527                                 close (ph->fd);
1528                                 ph->fd = -1;
1529                                 continue;
1530                         }
1531                 }
1532 #endif /* SO_BINDTODEVICE */
1533 #ifdef SO_MARK
1534                 if(obj->set_mark)
1535                 {
1536                         if(setsockopt(ph->fd, SOL_SOCKET, SO_MARK, &(obj->mark), sizeof(obj->mark)) != 0)
1537                         {
1538 #if WITH_DEBUG
1539                                 char errbuf[PING_ERRMSG_LEN];
1540                                 dprintf ("setsockopt (SO_MARK): %s\n",
1541                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1542 #endif
1543                                 ping_set_errno (obj, errno);
1544                                 close (ph->fd);
1545                                 ph->fd = -1;
1546                                 continue;
1547                         }
1548                 }
1549 #endif
1550 #ifdef SO_TIMESTAMP
1551                 if (1) /* {{{ */
1552                 {
1553                         int status;
1554                         int opt = 1;
1555
1556                         status = setsockopt (ph->fd,
1557                                         SOL_SOCKET, SO_TIMESTAMP,
1558                                         &opt, sizeof (opt));
1559                         if (status != 0)
1560                         {
1561 #if WITH_DEBUG
1562                                 char errbuf[PING_ERRMSG_LEN];
1563                                 dprintf ("setsockopt (SO_TIMESTAMP): %s\n",
1564                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1565 #endif
1566                                 ping_set_errno (obj, errno);
1567                                 close (ph->fd);
1568                                 ph->fd = -1;
1569                                 continue;
1570                         }
1571                 } /* }}} if (1) */
1572 #endif /* SO_TIMESTAMP */
1573                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1574                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1575                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1576                 ph->addrlen = ai_ptr->ai_addrlen;
1577                 ph->addrfamily = ai_ptr->ai_family;
1578
1579 #ifdef AI_CANONNAME
1580                 if ((ai_ptr->ai_canonname != NULL)
1581                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1582                 {
1583                         char *old_hostname;
1584
1585                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1586                                         ph->hostname, ai_ptr->ai_canonname);
1587
1588                         old_hostname = ph->hostname;
1589                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1590                         {
1591                                 /* strdup failed, falling back to old hostname */
1592                                 ph->hostname = old_hostname;
1593                         }
1594                         else if (old_hostname != NULL)
1595                         {
1596                                 free (old_hostname);
1597                         }
1598                 }
1599 #endif /* AI_CANONNAME */
1600
1601                 if (ph->addrfamily == AF_INET)
1602                 {
1603                         int opt;
1604
1605 #ifdef IP_RECVTOS
1606                         /* Enable receiving the TOS field */
1607                         opt = 1;
1608                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTOS,
1609                                         &opt, sizeof (opt));
1610 #endif  /* IP_RECVTOS */
1611
1612                         /* Enable receiving the TTL field */
1613                         opt = 1;
1614                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1615                                         &opt, sizeof (opt));
1616                 }
1617 #if defined(IPV6_RECVHOPLIMIT) || defined(IPV6_RECVTCLASS)
1618                 else if (ph->addrfamily == AF_INET6)
1619                 {
1620                         int opt;
1621
1622 # if defined(IPV6_RECVHOPLIMIT)
1623                         /* For details see RFC 3542, section 6.3. */
1624                         opt = 1;
1625                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1626                                         &opt, sizeof (opt));
1627 # endif /* IPV6_RECVHOPLIMIT */
1628
1629 # if defined(IPV6_RECVTCLASS)
1630                         /* For details see RFC 3542, section 6.5. */
1631                         opt = 1;
1632                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVTCLASS,
1633                                         &opt, sizeof (opt));
1634 # endif /* IPV6_RECVTCLASS */
1635                 }
1636 #endif /* IPV6_RECVHOPLIMIT || IPV6_RECVTCLASS */
1637
1638                 break;
1639         } /* for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next) */
1640
1641         freeaddrinfo (ai_list);
1642
1643         if (ph->fd < 0)
1644         {
1645                 ping_free (ph);
1646                 return (-1);
1647         }
1648
1649         /*
1650          * Adding in the front is much easier, but then the iterator will
1651          * return the host that was added last as first host. That's just not
1652          * nice. -octo
1653          */
1654         if (obj->head == NULL)
1655         {
1656                 obj->head = ph;
1657         }
1658         else
1659         {
1660                 pinghost_t *hptr;
1661
1662                 hptr = obj->head;
1663                 while (hptr->next != NULL)
1664                         hptr = hptr->next;
1665
1666                 assert ((hptr != NULL) && (hptr->next == NULL));
1667                 hptr->next = ph;
1668         }
1669
1670         ping_set_ttl (ph, obj->ttl);
1671         ping_set_qos (obj, ph, obj->qos);
1672
1673         return (0);
1674 } /* int ping_host_add */
1675
1676 int ping_host_remove (pingobj_t *obj, const char *host)
1677 {
1678         pinghost_t *pre, *cur;
1679
1680         if ((obj == NULL) || (host == NULL))
1681                 return (-1);
1682
1683         pre = NULL;
1684         cur = obj->head;
1685
1686         while (cur != NULL)
1687         {
1688                 if (strcasecmp (host, cur->username) == 0)
1689                         break;
1690
1691                 pre = cur;
1692                 cur = cur->next;
1693         }
1694
1695         if (cur == NULL)
1696         {
1697                 ping_set_error (obj, "ping_host_remove", "Host not found");
1698                 return (-1);
1699         }
1700
1701         if (pre == NULL)
1702                 obj->head = cur->next;
1703         else
1704                 pre->next = cur->next;
1705
1706         ping_free (cur);
1707
1708         return (0);
1709 }
1710
1711 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1712 {
1713         if (obj == NULL)
1714                 return (NULL);
1715         return ((pingobj_iter_t *) obj->head);
1716 }
1717
1718 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1719 {
1720         if (iter == NULL)
1721                 return (NULL);
1722         return ((pingobj_iter_t *) iter->next);
1723 }
1724
1725 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1726                 void *buffer, size_t *buffer_len)
1727 {
1728         int ret = EINVAL;
1729
1730         size_t orig_buffer_len = *buffer_len;
1731
1732         if ((iter == NULL) || (buffer_len == NULL))
1733                 return (-1);
1734
1735         if ((buffer == NULL) && (*buffer_len != 0 ))
1736                 return (-1);
1737
1738         switch (info)
1739         {
1740                 case PING_INFO_USERNAME:
1741                         ret = ENOMEM;
1742                         *buffer_len = strlen (iter->username) + 1;
1743                         if (orig_buffer_len <= *buffer_len)
1744                                 break;
1745                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1746                          * will copy `*buffer_len' and pad the rest of
1747                          * `buffer' with null-bytes */
1748                         strncpy (buffer, iter->username, orig_buffer_len);
1749                         ret = 0;
1750                         break;
1751
1752                 case PING_INFO_HOSTNAME:
1753                         ret = ENOMEM;
1754                         *buffer_len = strlen (iter->hostname) + 1;
1755                         if (orig_buffer_len < *buffer_len)
1756                                 break;
1757                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1758                          * will copy `*buffer_len' and pad the rest of
1759                          * `buffer' with null-bytes */
1760                         strncpy (buffer, iter->hostname, orig_buffer_len);
1761                         ret = 0;
1762                         break;
1763
1764                 case PING_INFO_ADDRESS:
1765                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1766                                         iter->addrlen,
1767                                         (char *) buffer,
1768                                         *buffer_len,
1769                                         NULL, 0,
1770                                         NI_NUMERICHOST);
1771                         if (ret != 0)
1772                         {
1773                                 if ((ret == EAI_MEMORY)
1774 #ifdef EAI_OVERFLOW
1775                                                 || (ret == EAI_OVERFLOW)
1776 #endif
1777                                    )
1778                                         ret = ENOMEM;
1779 #if defined(EAI_SYSTEM)
1780                                 else if (ret == EAI_SYSTEM)
1781                                         ret = errno;
1782 #endif
1783                                 else
1784                                         ret = EINVAL;
1785                         }
1786                         break;
1787
1788                 case PING_INFO_FAMILY:
1789                         ret = ENOMEM;
1790                         *buffer_len = sizeof (int);
1791                         if (orig_buffer_len < sizeof (int))
1792                                 break;
1793                         *((int *) buffer) = iter->addrfamily;
1794                         ret = 0;
1795                         break;
1796
1797                 case PING_INFO_LATENCY:
1798                         ret = ENOMEM;
1799                         *buffer_len = sizeof (double);
1800                         if (orig_buffer_len < sizeof (double))
1801                                 break;
1802                         *((double *) buffer) = iter->latency;
1803                         ret = 0;
1804                         break;
1805
1806                 case PING_INFO_DROPPED:
1807                         ret = ENOMEM;
1808                         *buffer_len = sizeof (uint32_t);
1809                         if (orig_buffer_len < sizeof (uint32_t))
1810                                 break;
1811                         *((uint32_t *) buffer) = iter->dropped;
1812                         ret = 0;
1813                         break;
1814
1815                 case PING_INFO_SEQUENCE:
1816                         ret = ENOMEM;
1817                         *buffer_len = sizeof (unsigned int);
1818                         if (orig_buffer_len < sizeof (unsigned int))
1819                                 break;
1820                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1821                         ret = 0;
1822                         break;
1823
1824                 case PING_INFO_IDENT:
1825                         ret = ENOMEM;
1826                         *buffer_len = sizeof (uint16_t);
1827                         if (orig_buffer_len < sizeof (uint16_t))
1828                                 break;
1829                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1830                         ret = 0;
1831                         break;
1832
1833                 case PING_INFO_DATA:
1834                         ret = ENOMEM;
1835                         *buffer_len = strlen (iter->data);
1836                         if (orig_buffer_len < *buffer_len)
1837                                 break;
1838                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1839                         ret = 0;
1840                         break;
1841
1842                 case PING_INFO_RECV_TTL:
1843                         ret = ENOMEM;
1844                         *buffer_len = sizeof (int);
1845                         if (orig_buffer_len < sizeof (int))
1846                                 break;
1847                         *((int *) buffer) = iter->recv_ttl;
1848                         ret = 0;
1849                         break;
1850
1851                 case PING_INFO_RECV_QOS:
1852                         ret = ENOMEM;
1853                         if (*buffer_len>sizeof(unsigned)) *buffer_len=sizeof(unsigned);
1854                         if (!*buffer_len) *buffer_len=1;
1855                         if (orig_buffer_len < *buffer_len)
1856                                 break;
1857                         memcpy(buffer,&iter->recv_qos,*buffer_len);
1858                         ret = 0;
1859                         break;
1860         }
1861
1862         return (ret);
1863 } /* ping_iterator_get_info */
1864
1865 void *ping_iterator_get_context (pingobj_iter_t *iter)
1866 {
1867         if (iter == NULL)
1868                 return (NULL);
1869         return (iter->context);
1870 }
1871
1872 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1873 {
1874         if (iter == NULL)
1875                 return;
1876         iter->context = context;
1877 }