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 #define PING_TABLE_LEN 5381
 108
 109 struct pinghost
 110 {
 111         /* username: name passed in by the user */
 112         char                    *username;
 113         /* hostname: name returned by the reverse lookup */
 114         char                    *hostname;
 115         struct sockaddr_storage *addr;
 116         socklen_t                addrlen;
 117         int                      addrfamily;
 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         struct pinghost         *table_next;
 131 };
 132
 133 struct pingobj
 134 {
 135         double                   timeout;
 136         int                      ttl;
 137         int                      addrfamily;
 138         uint8_t                  qos;
 139         char                    *data;
 140
 141         int                      fd4;
 142         int                      fd6;
 143
 144         struct sockaddr         *srcaddr;
 145         socklen_t                srcaddrlen;
 146
 147         char                    *device;
 148
 149         char                    set_mark;
 150         int                     mark;
 151
 152         char                     errmsg[PING_ERRMSG_LEN];
 153
 154         pinghost_t              *head;
 155         pinghost_t              *table[PING_TABLE_LEN];
 156 };
 157
 158 /*
 159  * private (static) functions
 160  */
 161 /* Even though Posix requires "strerror_r" to return an "int",
 162  * some systems (e.g. the GNU libc) return a "char *" _and_
 163  * ignore the second argument ... -tokkee */
 164 static char *sstrerror (int errnum, char *buf, size_t buflen)
 165 {
 166         buf[0] = 0;
 167
 168 #if !HAVE_STRERROR_R
 169         {
 170                 snprintf (buf, buflen, "Error %i (%#x)", errnum, errnum);
 171         }
 172 /* #endif !HAVE_STRERROR_R */
 173
 174 #elif STRERROR_R_CHAR_P
 175         {
 176                 char *temp;
 177                 temp = strerror_r (errnum, buf, buflen);
 178                 if (buf[0] == 0)
 179                 {
 180                         if ((temp != NULL) && (temp != buf) && (temp[0] != 0))
 181                                 strncpy (buf, temp, buflen);
 182                         else
 183                                 strncpy (buf, "strerror_r did not return "
 184                                                 "an error message", buflen);
 185                 }
 186         }
 187 /* #endif STRERROR_R_CHAR_P */
 188
 189 #else
 190         if (strerror_r (errnum, buf, buflen) != 0)
 191         {
 192                 snprintf (buf, buflen, "Error %i (%#x); "
 193                                 "Additionally, strerror_r failed.",
 194                                 errnum, errnum);
 195         }
 196 #endif /* STRERROR_R_CHAR_P */
 197
 198         buf[buflen - 1] = 0;
 199
 200         return (buf);
 201 } /* char *sstrerror */
 202
 203 static void ping_set_error (pingobj_t *obj, const char *function,
 204                 const char *message)
 205 {
 206         snprintf (obj->errmsg, sizeof (obj->errmsg),
 207                         "%s: %s", function, message);
 208         obj->errmsg[sizeof (obj->errmsg) - 1] = 0;
 209 }
 210
 211 static void ping_set_errno (pingobj_t *obj, int error_number)
 212 {
 213         sstrerror (error_number, obj->errmsg, sizeof (obj->errmsg));
 214 }
 215
 216 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
 217                 struct timeval *res)
 218 {
 219         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
 220         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
 221
 222         while (res->tv_usec > 1000000)
 223         {
 224                 res->tv_usec -= 1000000;
 225                 res->tv_sec++;
 226         }
 227
 228         return (0);
 229 }
 230
 231 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
 232                 struct timeval *res)
 233 {
 234         if ((tv1->tv_sec < tv2->tv_sec)
 235                         || ((tv1->tv_sec == tv2->tv_sec)
 236                                 && (tv1->tv_usec < tv2->tv_usec)))
 237                 return (-1);
 238
 239         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
 240         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
 241
 242         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec >= 0)));
 243
 244         while (res->tv_usec < 0)
 245         {
 246                 res->tv_usec += 1000000;
 247                 res->tv_sec--;
 248         }
 249
 250         return (0);
 251 }
 252
 253 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
 254 {
 255         uint32_t sum = 0;
 256         uint16_t ret = 0;
 257
 258         uint16_t *ptr;
 259
 260         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
 261                 sum += *ptr;
 262
 263         if (len == 1)
 264         {
 265                 *(char *) &ret = *(char *) ptr;
 266                 sum += ret;
 267         }
 268
 269         /* Do this twice to get all possible carries.. */
 270         sum = (sum >> 16) + (sum & 0xFFFF);
 271         sum = (sum >> 16) + (sum & 0xFFFF);
 272
 273         ret = ~sum;
 274
 275         return (ret);
 276 }
 277
 278 static pinghost_t *ping_receive_ipv4 (pingobj_t *obj, char *buffer,
 279                 size_t buffer_len)
 280 {
 281         struct ip *ip_hdr;
 282         struct icmp *icmp_hdr;
 283
 284         size_t ip_hdr_len;
 285
 286         uint16_t recv_checksum;
 287         uint16_t calc_checksum;
 288
 289         uint16_t ident;
 290         uint16_t seq;
 291
 292         pinghost_t *ptr;
 293
 294         if (buffer_len < sizeof (struct ip))
 295                 return (NULL);
 296
 297         ip_hdr     = (struct ip *) buffer;
 298         ip_hdr_len = ip_hdr->ip_hl << 2;
 299
 300         if (buffer_len < ip_hdr_len)
 301                 return (NULL);
 302
 303         buffer     += ip_hdr_len;
 304         buffer_len -= ip_hdr_len;
 305
 306         if (buffer_len < ICMP_MINLEN)
 307                 return (NULL);
 308
 309         icmp_hdr = (struct icmp *) buffer;
 310         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
 311         {
 312                 dprintf ("Unexpected ICMP type: %"PRIu8"\n", icmp_hdr->icmp_type);
 313                 return (NULL);
 314         }
 315
 316         recv_checksum = icmp_hdr->icmp_cksum;
 317         /* This writes to buffer. */
 318         icmp_hdr->icmp_cksum = 0;
 319         calc_checksum = ping_icmp4_checksum (buffer, buffer_len);
 320
 321         if (recv_checksum != calc_checksum)
 322         {
 323                 dprintf ("Checksum missmatch: Got 0x%04"PRIx16", "
 324                                 "calculated 0x%04"PRIx16"\n",
 325                                 recv_checksum, calc_checksum);
 326                 return (NULL);
 327         }
 328
 329         ident = ntohs (icmp_hdr->icmp_id);
 330         seq   = ntohs (icmp_hdr->icmp_seq);
 331
 332         for (ptr = obj->table[ident % PING_TABLE_LEN];
 333                         ptr != NULL; ptr = ptr->table_next)
 334         {
 335                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 336                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 337
 338                 if (ptr->addrfamily != AF_INET)
 339                         continue;
 340
 341                 if (!timerisset (ptr->timer))
 342                         continue;
 343
 344                 if (ptr->ident != ident)
 345                         continue;
 346
 347                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 348                         continue;
 349
 350                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
 351                                 "seq = %"PRIu16"\n",
 352                                 ptr->hostname, ident, seq);
 353
 354                 break;
 355         }
 356
 357         if (ptr == NULL)
 358         {
 359                 dprintf ("No match found for ident = 0x%04"PRIx16", seq = %"PRIu16"\n",
 360                                 ident, seq);
 361         }
 362
 363         if (ptr != NULL){
 364                 ptr->recv_ttl = (int)     ip_hdr->ip_ttl;
 365                 ptr->recv_qos = (uint8_t) ip_hdr->ip_tos;
 366         }
 367         return (ptr);
 368 }
 369
 370 #ifndef ICMP6_ECHO_REQUEST
 371 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
 372 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
 373 # else
 374 #  define ICMP6_ECHO_REQUEST 128
 375 # endif
 376 #endif
 377
 378 #ifndef ICMP6_ECHO_REPLY
 379 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
 380 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
 381 # else
 382 #  define ICMP6_ECHO_REPLY 129
 383 # endif
 384 #endif
 385
 386 static pinghost_t *ping_receive_ipv6 (pingobj_t *obj, char *buffer,
 387                 size_t buffer_len)
 388 {
 389         struct icmp6_hdr *icmp_hdr;
 390
 391         uint16_t ident;
 392         uint16_t seq;
 393
 394         pinghost_t *ptr;
 395
 396         if (buffer_len < ICMP_MINLEN)
 397                 return (NULL);
 398
 399         icmp_hdr = (struct icmp6_hdr *) buffer;
 400         buffer     += ICMP_MINLEN;
 401         buffer_len -= ICMP_MINLEN;
 402
 403         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 404         {
 405                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 406                 return (NULL);
 407         }
 408
 409         if (icmp_hdr->icmp6_code != 0)
 410         {
 411                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 412                 return (NULL);
 413         }
 414
 415         ident = ntohs (icmp_hdr->icmp6_id);
 416         seq   = ntohs (icmp_hdr->icmp6_seq);
 417
 418         /* We have to iterate over all hosts, since ICMPv6 packets may
 419          * be received on any raw v6 socket. */
 420         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 421         {
 422                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 423                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 424
 425                 if (ptr->addrfamily != AF_INET6)
 426                         continue;
 427
 428                 if (!timerisset (ptr->timer))
 429                         continue;
 430
 431                 if (ptr->ident != ident)
 432                         continue;
 433
 434                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 435                         continue;
 436
 437                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
 438                                 "seq = %"PRIu16"\n",
 439                                 ptr->hostname, ident, seq);
 440
 441                 break;
 442         }
 443
 444         if (ptr == NULL)
 445         {
 446                 dprintf ("No match found for ident = 0x%04"PRIx16", "
 447                                 "seq = %"PRIu16"\n",
 448                                 ident, seq);
 449         }
 450
 451         return (ptr);
 452 }
 453
 454 static int ping_receive_one (pingobj_t *obj, struct timeval *now, int addrfam)
 455 {
 456         int fd = addrfam == AF_INET6 ? obj->fd6 : obj->fd4;
 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 (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, 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 (addrfam == 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 (addrfam == 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 (addrfam == 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 (addrfam == 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                                 addrfam);
 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 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 641  * Sending functions:                                                        *
 642  *                                                                           *
 643  * ping_send_all                                                             *
 644  * +-> ping_send_one_ipv4                                                    *
 645  * `-> ping_send_one_ipv6                                                    *
 646  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 647 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 648                 const void *buf, size_t buflen, int fd)
 649 {
 650         ssize_t ret;
 651
 652         if (gettimeofday (ph->timer, NULL) == -1)
 653         {
 654                 timerclear (ph->timer);
 655                 return (-1);
 656         }
 657
 658         ret = sendto (fd, buf, buflen, 0,
 659                         (struct sockaddr *) ph->addr, ph->addrlen);
 660
 661         if (ret < 0)
 662         {
 663 #if defined(EHOSTUNREACH)
 664                 if (errno == EHOSTUNREACH)
 665                         return (0);
 666 #endif
 667 #if defined(ENETUNREACH)
 668                 if (errno == ENETUNREACH)
 669                         return (0);
 670 #endif
 671                 ping_set_errno (obj, errno);
 672         }
 673
 674         return (ret);
 675 }
 676
 677 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph, int fd)
 678 {
 679         struct icmp *icmp4;
 680         int status;
 681
 682         char   buf[4096] = {0};
 683         size_t buflen;
 684
 685         char *data;
 686         size_t datalen;
 687
 688         dprintf ("ph->hostname = %s\n", ph->hostname);
 689
 690         icmp4 = (struct icmp *) buf;
 691         *icmp4 = (struct icmp) {
 692                 .icmp_type = ICMP_ECHO,
 693                 .icmp_id   = htons (ph->ident),
 694                 .icmp_seq  = htons (ph->sequence),
 695         };
 696
 697         datalen = strlen (ph->data);
 698         buflen = ICMP_MINLEN + datalen;
 699         if (sizeof (buf) < buflen)
 700                 return (EINVAL);
 701
 702         data  = buf + ICMP_MINLEN;
 703         memcpy (data, ph->data, datalen);
 704
 705         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 706
 707         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 708
 709         status = ping_sendto (obj, ph, buf, buflen, fd);
 710         if (status < 0)
 711         {
 712                 perror ("ping_sendto");
 713                 return (-1);
 714         }
 715
 716         dprintf ("sendto: status = %i\n", status);
 717
 718         return (0);
 719 }
 720
 721 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph, int fd)
 722 {
 723         struct icmp6_hdr *icmp6;
 724         int status;
 725
 726         char buf[4096] = {0};
 727         int  buflen;
 728
 729         char *data;
 730         int   datalen;
 731
 732         dprintf ("ph->hostname = %s\n", ph->hostname);
 733
 734         icmp6 = (struct icmp6_hdr *) buf;
 735         *icmp6 = (struct icmp6_hdr) {
 736                 .icmp6_type  = ICMP6_ECHO_REQUEST,
 737                 .icmp6_id    = htons (ph->ident),
 738                 .icmp6_seq   = htons (ph->sequence),
 739         };
 740
 741         datalen = strlen (ph->data);
 742         buflen = sizeof (*icmp6) + datalen;
 743         if (sizeof (buf) < buflen)
 744                 return (EINVAL);
 745
 746         data  = buf + ICMP_MINLEN;
 747         memcpy (data, ph->data, datalen);
 748
 749         /* The checksum will be calculated by the TCP/IP stack. */
 750
 751         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 752
 753         status = ping_sendto (obj, ph, buf, buflen, fd);
 754         if (status < 0)
 755         {
 756                 perror ("ping_sendto");
 757                 return (-1);
 758         }
 759
 760         dprintf ("sendto: status = %i\n", status);
 761
 762         return (0);
 763 }
 764
 765 static int ping_send_one (pingobj_t *obj, pinghost_t *ptr, int fd)
 766 {
 767         if (gettimeofday (ptr->timer, NULL) == -1)
 768         {
 769                 /* start timer.. The GNU `ping6' starts the timer before
 770                  * sending the packet, so I will do that too */
 771 #if WITH_DEBUG
 772                 char errbuf[PING_ERRMSG_LEN];
 773                 dprintf ("gettimeofday: %s\n",
 774                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 775 #endif
 776                 timerclear (ptr->timer);
 777                 return (-1);
 778         }
 779         else
 780         {
 781                 dprintf ("timer set for hostname = %s\n", ptr->hostname);
 782         }
 783
 784         if (ptr->addrfamily == AF_INET6)
 785         {
 786                 dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 787                 if (ping_send_one_ipv6 (obj, ptr, fd) != 0)
 788                 {
 789                         timerclear (ptr->timer);
 790                         return (-1);
 791                 }
 792         }
 793         else if (ptr->addrfamily == AF_INET)
 794         {
 795                 dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 796                 if (ping_send_one_ipv4 (obj, ptr, fd) != 0)
 797                 {
 798                         timerclear (ptr->timer);
 799                         return (-1);
 800                 }
 801         }
 802         else /* this should not happen */
 803         {
 804                 dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 805                 timerclear (ptr->timer);
 806                 return (-1);
 807         }
 808
 809         ptr->sequence++;
 810
 811         return (0);
 812 }
 813
 814 /*
 815  * Set the TTL of a socket protocol independently.
 816  */
 817 static int ping_set_ttl (pingobj_t *obj, int ttl)
 818 {
 819         int ret = 0;
 820         char errbuf[PING_ERRMSG_LEN];
 821
 822         if (obj->fd4 != -1)
 823         {
 824                 if (setsockopt (obj->fd4, IPPROTO_IP, IP_TTL,
 825                                 &ttl, sizeof (ttl)))
 826                 {
 827                         ret = errno;
 828                         ping_set_error (obj, "ping_set_ttl",
 829                                         sstrerror (ret, errbuf, sizeof (errbuf)));
 830                         dprintf ("Setting TTLv4 failed: %s\n", errbuf);
 831                 }
 832         }
 833
 834         if (obj->fd6 != -1)
 835         {
 836                 dprintf ("Setting TTLv6 to %i\n", ttl);
 837                 if (setsockopt (obj->fd6, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
 838                                 &ttl, sizeof (ttl)))
 839                 {
 840                         ret = errno;
 841                         ping_set_error (obj, "ping_set_ttl",
 842                                         sstrerror (ret, errbuf, sizeof (errbuf)));
 843                         dprintf ("Setting TTLv6 failed: %s\n", errbuf);
 844                 }
 845         }
 846
 847         return (ret);
 848 }
 849
 850 /*
 851  * Set the TOS of a socket protocol independently.
 852  *
 853  * Using SOL_SOCKET / SO_PRIORITY might be a protocol independent way to
 854  * set this. See socket(7) for details.
 855  */
 856 static int ping_set_qos (pingobj_t *obj, uint8_t qos)
 857 {
 858         int ret = 0;
 859         char errbuf[PING_ERRMSG_LEN];
 860
 861         if (obj->fd4 != -1)
 862         {
 863                 dprintf ("Setting TP_TOS to %#04"PRIx8"\n", qos);
 864                 if (setsockopt (obj->fd4, IPPROTO_IP, IP_TOS,
 865                                 &qos, sizeof (qos)))
 866                 {
 867                         ret = errno;
 868                         ping_set_error (obj, "ping_set_qos",
 869                                         sstrerror (ret, errbuf, sizeof (errbuf)));
 870                         dprintf ("Setting TP_TOS failed: %s\n", errbuf);
 871                 }
 872         }
 873
 874         if (obj->fd6 != -1)
 875         {
 876                 /* IPV6_TCLASS requires an "int". */
 877                 int tmp = (int) qos;
 878
 879                 dprintf ("Setting IPV6_TCLASS to %#04"PRIx8" (%i)\n", qos, tmp);
 880                 if (setsockopt (obj->fd6, IPPROTO_IPV6, IPV6_TCLASS,
 881                         &tmp, sizeof (tmp)))
 882                 {
 883                         ret = errno;
 884                         ping_set_error (obj, "ping_set_qos",
 885                                         sstrerror (ret, errbuf, sizeof (errbuf)));
 886                         dprintf ("Setting IPV6_TCLASS failed: %s\n", errbuf);
 887                 }
 888         }
 889
 890         return (ret);
 891 }
 892
 893 static int ping_get_ident (void)
 894 {
 895         int fd;
 896         static int did_seed = 0;
 897
 898         int retval;
 899
 900         if (did_seed == 0)
 901         {
 902                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 903                 {
 904                         unsigned int seed;
 905
 906                         if (read (fd, &seed, sizeof (seed)) != -1)
 907                         {
 908                                 did_seed = 1;
 909                                 dprintf ("Random seed:   %#x\n", seed);
 910                                 srandom (seed);
 911                         }
 912
 913                         close (fd);
 914                 }
 915 #if WITH_DEBUG
 916                 else
 917                 {
 918                         char errbuf[PING_ERRMSG_LEN];
 919                         dprintf ("open (/dev/urandom): %s\n",
 920                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 921                 }
 922 #endif
 923         }
 924
 925         retval = (int) random ();
 926
 927         dprintf ("Random number: %#x\n", retval);
 928
 929         return (retval);
 930 }
 931
 932 static pinghost_t *ping_alloc (void)
 933 {
 934         pinghost_t *ph;
 935         size_t      ph_size;
 936
 937         ph_size = sizeof (pinghost_t)
 938                 + sizeof (struct sockaddr_storage)
 939                 + sizeof (struct timeval);
 940
 941         ph = (pinghost_t *) malloc (ph_size);
 942         if (ph == NULL)
 943                 return (NULL);
 944
 945         memset (ph, '\0', ph_size);
 946
 947         ph->timer   = (struct timeval *) (ph + 1);
 948         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
 949
 950         ph->addrlen = sizeof (struct sockaddr_storage);
 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->username != NULL)
 961                 free (ph->username);
 962
 963         if (ph->hostname != NULL)
 964                 free (ph->hostname);
 965
 966         if (ph->data != NULL)
 967                 free (ph->data);
 968
 969         free (ph);
 970 }
 971
 972 /* ping_open_socket opens, initializes and returns a new raw socket to use for
 973  * ICMPv4 or ICMPv6 packets. addrfam must be either AF_INET or AF_INET6. On
 974  * error, -1 is returned and obj->errmsg is set appropriately. */
 975 static int ping_open_socket(pingobj_t *obj, int addrfam)
 976 {
 977         int fd;
 978         if (addrfam == AF_INET6)
 979         {
 980                 fd = socket(addrfam, SOCK_RAW, IPPROTO_ICMPV6);
 981         }
 982         else if (addrfam == AF_INET)
 983         {
 984                 fd = socket(addrfam, SOCK_RAW, IPPROTO_ICMP);
 985         }
 986         else /* this should not happen */
 987         {
 988                 ping_set_error (obj, "ping_open_socket", "Unknown address family");
 989                 dprintf ("Unknown address family: %i\n", addrfam);
 990                 return -1;
 991         }
 992
 993         if (fd == -1)
 994         {
 995                 ping_set_errno (obj, errno);
 996 #if WITH_DEBUG
 997                 char errbuf[PING_ERRMSG_LEN];
 998                 dprintf ("socket: %s\n",
 999                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1000 #endif
1001                 return -1;
1002         }
1003         else if (fd >= FD_SETSIZE)
1004         {
1005                 ping_set_errno (obj, EMFILE);
1006                 dprintf ("socket(2) returned file descriptor %d, which is above the file "
1007                          "descriptor limit for select(2) (FD_SETSIZE = %d)\n",
1008                          fd, FD_SETSIZE);
1009                 close (fd);
1010                 return -1;
1011         }
1012
1013         if (obj->srcaddr != NULL)
1014         {
1015                 assert (obj->srcaddrlen > 0);
1016                 assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1017
1018                 if (bind (fd, obj->srcaddr, obj->srcaddrlen) == -1)
1019                 {
1020                         ping_set_errno (obj, errno);
1021 #if WITH_DEBUG
1022                         char errbuf[PING_ERRMSG_LEN];
1023                         dprintf ("bind: %s\n",
1024                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1025 #endif
1026                         close (fd);
1027                         return -1;
1028                 }
1029         }
1030
1031 #ifdef SO_BINDTODEVICE
1032         if (obj->device != NULL)
1033         {
1034                 if (setsockopt (fd, SOL_SOCKET, SO_BINDTODEVICE,
1035                                 obj->device, strlen (obj->device) + 1) != 0)
1036                 {
1037                         ping_set_errno (obj, errno);
1038 #if WITH_DEBUG
1039                         char errbuf[PING_ERRMSG_LEN];
1040                         dprintf ("setsockopt (SO_BINDTODEVICE): %s\n",
1041                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1042 #endif
1043                         close (fd);
1044                         return -1;
1045                 }
1046         }
1047 #endif /* SO_BINDTODEVICE */
1048 #ifdef SO_MARK
1049         if (obj->set_mark)
1050         {
1051                 if (setsockopt(fd, SOL_SOCKET, SO_MARK,
1052                                 &obj->mark, sizeof(obj->mark)) != 0)
1053                 {
1054                         ping_set_errno (obj, errno);
1055 #if WITH_DEBUG
1056                         char errbuf[PING_ERRMSG_LEN];
1057                         dprintf ("setsockopt (SO_MARK): %s\n",
1058                                  sstrerror (errno, errbuf, sizeof (errbuf)));
1059 #endif
1060                         close (fd);
1061                         return -1;
1062                 }
1063         }
1064 #endif
1065 #ifdef SO_TIMESTAMP
1066         if (1) /* {{{ */
1067         {
1068                 int status;
1069                 int opt = 1;
1070
1071                 status = setsockopt (fd,
1072                                 SOL_SOCKET, SO_TIMESTAMP,
1073                                 &opt, sizeof (opt));
1074                 if (status != 0)
1075                 {
1076                         ping_set_errno (obj, errno);
1077 #if WITH_DEBUG
1078                         char errbuf[PING_ERRMSG_LEN];
1079                         dprintf ("setsockopt (SO_TIMESTAMP): %s\n",
1080                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1081 #endif
1082                         close (fd);
1083                         return -1;
1084                 }
1085         } /* }}} if (1) */
1086 #endif /* SO_TIMESTAMP */
1087
1088         if (addrfam == AF_INET)
1089         {
1090                 int opt;
1091
1092 #ifdef IP_RECVTOS
1093                 /* Enable receiving the TOS field */
1094                 opt = 1;
1095                 setsockopt (fd, IPPROTO_IP, IP_RECVTOS,
1096                                 &opt, sizeof (opt));
1097 #endif /* IP_RECVTOS */
1098
1099                 /* Enable receiving the TTL field */
1100                 opt = 1;
1101                 setsockopt (fd, IPPROTO_IP, IP_RECVTTL,
1102                                 &opt, sizeof (opt));
1103         }
1104 #if defined(IPV6_RECVHOPLIMIT) || defined(IPV6_RECVTCLASS)
1105         else if (addrfam == AF_INET6)
1106         {
1107                 int opt;
1108
1109 # if defined(IPV6_RECVHOPLIMIT)
1110                 /* For details see RFC 3542, section 6.3. */
1111                 opt = 1;
1112                 setsockopt (fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1113                                 &opt, sizeof (opt));
1114 # endif /* IPV6_RECVHOPLIMIT */
1115
1116 # if defined(IPV6_RECVTCLASS)
1117                 /* For details see RFC 3542, section 6.5. */
1118                 opt = 1;
1119                 setsockopt (fd, IPPROTO_IPV6, IPV6_RECVTCLASS,
1120                                 &opt, sizeof (opt));
1121 # endif /* IPV6_RECVTCLASS */
1122         }
1123 #endif /* IPV6_RECVHOPLIMIT || IPV6_RECVTCLASS */
1124
1125         return fd;
1126 }
1127
1128 /*
1129  * public methods
1130  */
1131 const char *ping_get_error (pingobj_t *obj)
1132 {
1133         if (obj == NULL)
1134                 return (NULL);
1135         return (obj->errmsg);
1136 }
1137
1138 pingobj_t *ping_construct (void)
1139 {
1140         pingobj_t *obj;
1141
1142         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
1143                 return (NULL);
1144         memset (obj, 0, sizeof (pingobj_t));
1145
1146         obj->timeout    = PING_DEF_TIMEOUT;
1147         obj->ttl        = PING_DEF_TTL;
1148         obj->addrfamily = PING_DEF_AF;
1149         obj->data       = strdup (PING_DEF_DATA);
1150         obj->qos        = 0;
1151         obj->fd4        = -1;
1152         obj->fd6        = -1;
1153
1154         return (obj);
1155 }
1156
1157 void ping_destroy (pingobj_t *obj)
1158 {
1159         pinghost_t *current;
1160         pinghost_t *next;
1161
1162         if (obj == NULL)
1163                 return;
1164
1165         current = obj->head;
1166         next = NULL;
1167
1168         while (current != NULL)
1169         {
1170                 next = current->next;
1171                 ping_free (current);
1172                 current = next;
1173         }
1174
1175         if (obj->data != NULL)
1176                 free (obj->data);
1177
1178         if (obj->srcaddr != NULL)
1179                 free (obj->srcaddr);
1180
1181         if (obj->device != NULL)
1182                 free (obj->device);
1183
1184         if (obj->fd4 != -1)
1185                 close(obj->fd4);
1186
1187         if (obj->fd6 != -1)
1188                 close(obj->fd6);
1189
1190         free (obj);
1191
1192         return;
1193 }
1194
1195 int ping_setopt (pingobj_t *obj, int option, void *value)
1196 {
1197         int ret = 0;
1198
1199         if ((obj == NULL) || (value == NULL))
1200                 return (-1);
1201
1202         switch (option)
1203         {
1204                 case PING_OPT_QOS:
1205                 {
1206                         obj->qos = *((uint8_t *) value);
1207                         ret = ping_set_qos (obj, obj->qos);
1208                         break;
1209                 }
1210
1211                 case PING_OPT_TIMEOUT:
1212                         obj->timeout = *((double *) value);
1213                         if (obj->timeout < 0.0)
1214                         {
1215                                 obj->timeout = PING_DEF_TIMEOUT;
1216                                 ret = -1;
1217                         }
1218                         break;
1219
1220                 case PING_OPT_TTL:
1221                         ret = *((int *) value);
1222                         if ((ret < 1) || (ret > 255))
1223                         {
1224                                 obj->ttl = PING_DEF_TTL;
1225                                 ret = -1;
1226                         }
1227                         else
1228                         {
1229                                 obj->ttl = ret;
1230                                 ret = ping_set_ttl (obj, obj->ttl);
1231                         }
1232                         break;
1233
1234                 case PING_OPT_AF:
1235                         obj->addrfamily = *((int *) value);
1236                         if ((obj->addrfamily != AF_UNSPEC)
1237                                         && (obj->addrfamily != AF_INET)
1238                                         && (obj->addrfamily != AF_INET6))
1239                         {
1240                                 obj->addrfamily = PING_DEF_AF;
1241                                 ret = -1;
1242                         }
1243                         if (obj->srcaddr != NULL)
1244                         {
1245                                 free (obj->srcaddr);
1246                                 obj->srcaddr = NULL;
1247                         }
1248                         break;
1249
1250                 case PING_OPT_DATA:
1251                         if (obj->data != NULL)
1252                         {
1253                                 free (obj->data);
1254                                 obj->data = NULL;
1255                         }
1256                         obj->data = strdup ((const char *) value);
1257                         break;
1258
1259                 case PING_OPT_SOURCE:
1260                 {
1261                         char            *hostname = (char *) value;
1262                         struct addrinfo  ai_hints;
1263                         struct addrinfo *ai_list;
1264                         int              status;
1265 #if WITH_DEBUG
1266                         if (obj->addrfamily != AF_UNSPEC)
1267                         {
1268                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1269                         }
1270 #endif
1271                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1272                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1273 #if defined(AI_ADDRCONFIG)
1274                         ai_hints.ai_flags = AI_ADDRCONFIG;
1275 #endif
1276                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1277                         if (status != 0)
1278                         {
1279 #if defined(EAI_SYSTEM)
1280                                 char errbuf[PING_ERRMSG_LEN];
1281 #endif
1282                                 ping_set_error (obj, "getaddrinfo",
1283 #if defined(EAI_SYSTEM)
1284                                                 (status == EAI_SYSTEM)
1285                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1286 #endif
1287                                                 gai_strerror (status));
1288                                 ret = -1;
1289                                 break;
1290                         }
1291 #if WITH_DEBUG
1292                         if (ai_list->ai_next != NULL)
1293                         {
1294                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1295                         }
1296 #endif
1297                         if (obj->srcaddr == NULL)
1298                         {
1299                                 obj->srcaddrlen = 0;
1300                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1301                                 if (obj->srcaddr == NULL)
1302                                 {
1303                                         ping_set_errno (obj, errno);
1304                                         ret = -1;
1305                                         freeaddrinfo (ai_list);
1306                                         break;
1307                                 }
1308                         }
1309                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1310                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1311                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1312                                         ai_list->ai_addrlen);
1313                         obj->srcaddrlen = ai_list->ai_addrlen;
1314                         obj->addrfamily = ai_list->ai_family;
1315
1316                         freeaddrinfo (ai_list);
1317                 } /* case PING_OPT_SOURCE */
1318                 break;
1319
1320                 case PING_OPT_DEVICE:
1321                 {
1322 #ifdef SO_BINDTODEVICE
1323                         char *device = strdup ((char *) value);
1324
1325                         if (device == NULL)
1326                         {
1327                                 ping_set_errno (obj, errno);
1328                                 ret = -1;
1329                                 break;
1330                         }
1331
1332                         if (obj->device != NULL)
1333                                 free (obj->device);
1334                         obj->device = device;
1335 #else /* ! SO_BINDTODEVICE */
1336                         ping_set_errno (obj, ENOTSUP);
1337                         ret = -1;
1338 #endif /* ! SO_BINDTODEVICE */
1339                 } /* case PING_OPT_DEVICE */
1340                 break;
1341
1342                 case PING_OPT_MARK:
1343                 {
1344 #ifdef SO_MARK
1345                         obj->mark     = *(int*)(value);
1346                         obj->set_mark = 1;
1347 #else /* SO_MARK */
1348                         ping_set_errno (obj, ENOTSUP);
1349                         ret = -1;
1350 #endif /* !SO_MARK */
1351
1352                 } /* case PING_OPT_MARK */
1353                 break;
1354
1355                 default:
1356                         ret = -2;
1357         } /* switch (option) */
1358
1359         return (ret);
1360 } /* int ping_setopt */
1361
1362 int ping_send (pingobj_t *obj)
1363 {
1364         pinghost_t *ptr;
1365
1366         struct timeval endtime;
1367         struct timeval nowtime;
1368         struct timeval timeout;
1369
1370         _Bool need_ipv4_socket = 0;
1371         _Bool need_ipv6_socket = 0;
1372
1373         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
1374         {
1375                 ptr->latency  = -1.0;
1376                 ptr->recv_ttl = -1;
1377
1378                 if (ptr->addrfamily == AF_INET)
1379                         need_ipv4_socket = 1;
1380                 else if (ptr->addrfamily == AF_INET6)
1381                         need_ipv6_socket = 1;
1382         }
1383
1384         if (!need_ipv4_socket && !need_ipv6_socket)
1385         {
1386                 ping_set_error (obj, "ping_send", "No hosts to ping");
1387                 return (-1);
1388         }
1389
1390         if (need_ipv4_socket && obj->fd4 == -1)
1391         {
1392                 obj->fd4 = ping_open_socket(obj, AF_INET);
1393                 if (obj->fd4 == -1)
1394                         return (-1);
1395                 ping_set_ttl (obj, obj->ttl);
1396                 ping_set_qos (obj, obj->qos);
1397         }
1398         if (need_ipv6_socket && obj->fd6 == -1)
1399         {
1400                 obj->fd6 = ping_open_socket(obj, AF_INET6);
1401                 if (obj->fd6 == -1)
1402                         return (-1);
1403                 ping_set_ttl (obj, obj->ttl);
1404                 ping_set_qos (obj, obj->qos);
1405         }
1406
1407         if (gettimeofday (&nowtime, NULL) == -1)
1408         {
1409                 ping_set_errno (obj, errno);
1410                 return (-1);
1411         }
1412
1413         /* Set up timeout */
1414         timeout.tv_sec = (time_t) obj->timeout;
1415         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
1416
1417         dprintf ("Set timeout to %i.%06i seconds\n",
1418                         (int) timeout.tv_sec,
1419                         (int) timeout.tv_usec);
1420
1421         ping_timeval_add (&nowtime, &timeout, &endtime);
1422
1423         /* host_to_ping points to the host to which to send the next ping. The
1424          * pointer is advanced to the next host in the linked list after the
1425          * ping has been sent. If host_to_ping is NULL, no more pings need to be
1426          * send out. */
1427         pinghost_t *host_to_ping = obj->head;
1428
1429         /* pings_in_flight is the number of hosts we sent a "ping" to but didn't
1430          * receive a "pong" yet. */
1431         int pings_in_flight = 0;
1432
1433         /* pongs_received is the number of echo replies received. Unless there
1434          * is an error, this is used as the return value of ping_send(). */
1435         int pongs_received = 0;
1436
1437         int error_count = 0;
1438
1439         while (pings_in_flight > 0 || host_to_ping != NULL)
1440         {
1441                 fd_set read_fds;
1442                 fd_set write_fds;
1443
1444                 int write_fd = -1;
1445                 int max_fd = -1;
1446
1447                 FD_ZERO (&read_fds);
1448                 FD_ZERO (&write_fds);
1449
1450                 if (obj->fd4 != -1)
1451                 {
1452                         FD_SET(obj->fd4, &read_fds);
1453                         if (host_to_ping != NULL && host_to_ping->addrfamily == AF_INET)
1454                                 write_fd = obj->fd4;
1455
1456                         if (max_fd < obj->fd4)
1457                                 max_fd = obj->fd4;
1458                 }
1459
1460                 if (obj->fd6 != -1)
1461                 {
1462                         FD_SET(obj->fd6, &read_fds);
1463                         if (host_to_ping != NULL && host_to_ping->addrfamily == AF_INET6)
1464                                 write_fd = obj->fd6;
1465
1466                         if (max_fd < obj->fd6)
1467                                 max_fd = obj->fd6;
1468                 }
1469
1470                 if (write_fd != -1)
1471                         FD_SET(write_fd, &write_fds);
1472
1473                 assert (max_fd != -1);
1474                 assert (max_fd < FD_SETSIZE);
1475
1476                 if (gettimeofday (&nowtime, NULL) == -1)
1477                 {
1478                         ping_set_errno (obj, errno);
1479                         return (-1);
1480                 }
1481
1482                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
1483                         break;
1484
1485                 dprintf ("Waiting on %i sockets for %u.%06u seconds\n",
1486                                 ((obj->fd4 != -1) ? 1 : 0) + ((obj->fd6 != -1) ? 1 : 0),
1487                                 (unsigned) timeout.tv_sec,
1488                                 (unsigned) timeout.tv_usec);
1489
1490                 int status = select (max_fd + 1, &read_fds, &write_fds, NULL, &timeout);
1491
1492                 if (gettimeofday (&nowtime, NULL) == -1)
1493                 {
1494                         ping_set_errno (obj, errno);
1495                         return (-1);
1496                 }
1497
1498                 if (status == -1)
1499                 {
1500                         ping_set_errno (obj, errno);
1501                         dprintf ("select: %s\n", obj->errmsg);
1502                         return (-1);
1503                 }
1504                 else if (status == 0)
1505                 {
1506                         dprintf ("select timed out\n");
1507
1508                         pinghost_t *ph;
1509                         for (ph = obj->head; ph != NULL; ph = ph->next)
1510                                 if (ph->latency < 0.0)
1511                                         ph->dropped++;
1512                         break;
1513                 }
1514
1515                 /* first, check if we can receive a reply ... */
1516                 if (obj->fd6  != -1 && FD_ISSET (obj->fd6, &read_fds))
1517                 {
1518                         if (ping_receive_one (obj, &nowtime, AF_INET6) == 0)
1519                         {
1520                                 pings_in_flight--;
1521                                 pongs_received++;
1522                         }
1523                         continue;
1524                 }
1525                 if (obj->fd4 != -1 && FD_ISSET (obj->fd4, &read_fds))
1526                 {
1527                         if (ping_receive_one (obj, &nowtime, AF_INET) == 0)
1528                         {
1529                                 pings_in_flight--;
1530                                 pongs_received++;
1531                         }
1532                         continue;
1533                 }
1534
1535                 /* ... and if no reply is available to read, continue sending
1536                  * out pings. */
1537
1538                 /* this condition should always be true. We keep it for
1539                  * consistency with the read blocks above and just to be on the
1540                  * safe side. */
1541                 if (write_fd != -1 && FD_ISSET (write_fd, &write_fds))
1542                 {
1543                         if (ping_send_one (obj, host_to_ping, write_fd) == 0)
1544                                 pings_in_flight++;
1545                         else
1546                                 error_count++;
1547                         host_to_ping = host_to_ping->next;
1548                         continue;
1549                 }
1550         } /* while (1) */
1551
1552         if (error_count)
1553                 return (-1 * error_count);
1554         return (pongs_received);
1555 } /* int ping_send */
1556
1557 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1558 {
1559         while (ph != NULL)
1560         {
1561                 if (strcasecmp (ph->username, host) == 0)
1562                         break;
1563
1564                 ph = ph->next;
1565         }
1566
1567         return (ph);
1568 }
1569
1570 int ping_host_add (pingobj_t *obj, const char *host)
1571 {
1572         pinghost_t *ph;
1573
1574         struct addrinfo  ai_hints;
1575         struct addrinfo *ai_list, *ai_ptr;
1576         int              ai_return;
1577
1578         if ((obj == NULL) || (host == NULL))
1579                 return (-1);
1580
1581         dprintf ("host = %s\n", host);
1582
1583         if (ping_host_search (obj->head, host) != NULL)
1584                 return (0);
1585
1586         memset (&ai_hints, '\0', sizeof (ai_hints));
1587         ai_hints.ai_flags     = 0;
1588 #ifdef AI_ADDRCONFIG
1589         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1590 #endif
1591 #ifdef AI_CANONNAME
1592         ai_hints.ai_flags    |= AI_CANONNAME;
1593 #endif
1594         ai_hints.ai_family    = obj->addrfamily;
1595         ai_hints.ai_socktype  = SOCK_RAW;
1596
1597         if ((ph = ping_alloc ()) == NULL)
1598         {
1599                 dprintf ("Out of memory!\n");
1600                 return (-1);
1601         }
1602
1603         if ((ph->username = strdup (host)) == NULL)
1604         {
1605                 dprintf ("Out of memory!\n");
1606                 ping_set_errno (obj, errno);
1607                 ping_free (ph);
1608                 return (-1);
1609         }
1610
1611         if ((ph->hostname = strdup (host)) == NULL)
1612         {
1613                 dprintf ("Out of memory!\n");
1614                 ping_set_errno (obj, errno);
1615                 ping_free (ph);
1616                 return (-1);
1617         }
1618
1619         /* obj->data is not garuanteed to be != NULL */
1620         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1621         {
1622                 dprintf ("Out of memory!\n");
1623                 ping_set_errno (obj, errno);
1624                 ping_free (ph);
1625                 return (-1);
1626         }
1627
1628         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1629         {
1630 #if defined(EAI_SYSTEM)
1631                 char errbuf[PING_ERRMSG_LEN];
1632 #endif
1633                 dprintf ("getaddrinfo failed\n");
1634                 ping_set_error (obj, "getaddrinfo",
1635 #if defined(EAI_SYSTEM)
1636                                                 (ai_return == EAI_SYSTEM)
1637                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1638 #endif
1639                                 gai_strerror (ai_return));
1640                 ping_free (ph);
1641                 return (-1);
1642         }
1643
1644         if (ai_list == NULL)
1645                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1646
1647         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1648         {
1649                 if (ai_ptr->ai_family == AF_INET)
1650                 {
1651                         ai_ptr->ai_socktype = SOCK_RAW;
1652                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1653                 }
1654                 else if (ai_ptr->ai_family == AF_INET6)
1655                 {
1656                         ai_ptr->ai_socktype = SOCK_RAW;
1657                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1658                 }
1659                 else
1660                 {
1661                         char errmsg[PING_ERRMSG_LEN];
1662
1663                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1664                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1665
1666                         dprintf ("%s", errmsg);
1667                         ping_set_error (obj, "getaddrinfo", errmsg);
1668                         continue;
1669                 }
1670
1671                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1672                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1673                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1674                 ph->addrlen = ai_ptr->ai_addrlen;
1675                 ph->addrfamily = ai_ptr->ai_family;
1676
1677 #ifdef AI_CANONNAME
1678                 if ((ai_ptr->ai_canonname != NULL)
1679                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1680                 {
1681                         char *old_hostname;
1682
1683                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1684                                         ph->hostname, ai_ptr->ai_canonname);
1685
1686                         old_hostname = ph->hostname;
1687                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1688                         {
1689                                 /* strdup failed, falling back to old hostname */
1690                                 ph->hostname = old_hostname;
1691                         }
1692                         else if (old_hostname != NULL)
1693                         {
1694                                 free (old_hostname);
1695                         }
1696                 }
1697 #endif /* AI_CANONNAME */
1698         } /* for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next) */
1699
1700         freeaddrinfo (ai_list);
1701
1702         /*
1703          * Adding in the front is much easier, but then the iterator will
1704          * return the host that was added last as first host. That's just not
1705          * nice. -octo
1706          */
1707         if (obj->head == NULL)
1708         {
1709                 obj->head = ph;
1710         }
1711         else
1712         {
1713                 pinghost_t *hptr;
1714
1715                 hptr = obj->head;
1716                 while (hptr->next != NULL)
1717                         hptr = hptr->next;
1718
1719                 assert ((hptr != NULL) && (hptr->next == NULL));
1720                 hptr->next = ph;
1721         }
1722
1723         ph->table_next = obj->table[ph->ident % PING_TABLE_LEN];
1724         obj->table[ph->ident % PING_TABLE_LEN] = ph;
1725
1726         return (0);
1727 } /* int ping_host_add */
1728
1729 int ping_host_remove (pingobj_t *obj, const char *host)
1730 {
1731         pinghost_t *pre, *cur, *target;
1732
1733         if ((obj == NULL) || (host == NULL))
1734                 return (-1);
1735
1736         pre = NULL;
1737         cur = obj->head;
1738
1739         while (cur != NULL)
1740         {
1741                 if (strcasecmp (host, cur->username) == 0)
1742                         break;
1743
1744                 pre = cur;
1745                 cur = cur->next;
1746         }
1747
1748         if (cur == NULL)
1749         {
1750                 ping_set_error (obj, "ping_host_remove", "Host not found");
1751                 return (-1);
1752         }
1753
1754         if (pre == NULL)
1755                 obj->head = cur->next;
1756         else
1757                 pre->next = cur->next;
1758
1759         target = cur;
1760         pre = NULL;
1761
1762         cur = obj->table[target->ident % PING_TABLE_LEN];
1763
1764         while (cur != NULL)
1765         {
1766                 if (cur == target)
1767                         break;
1768
1769                 pre = cur;
1770                 cur = cur->table_next;
1771         }
1772
1773         if (cur == NULL)
1774         {
1775                 ping_set_error(obj, "ping_host_remove", "Host not found (T)");
1776                 ping_free(target);
1777                 return (-1);
1778         }
1779
1780         if (pre == NULL)
1781                 obj->table[target->ident % PING_TABLE_LEN] = cur->table_next;
1782         else
1783                 pre->table_next = cur->table_next;
1784
1785         ping_free (cur);
1786
1787         return (0);
1788 }
1789
1790 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1791 {
1792         if (obj == NULL)
1793                 return (NULL);
1794         return ((pingobj_iter_t *) obj->head);
1795 }
1796
1797 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1798 {
1799         if (iter == NULL)
1800                 return (NULL);
1801         return ((pingobj_iter_t *) iter->next);
1802 }
1803
1804 int ping_iterator_count (pingobj_t *obj)
1805 {
1806         if (obj == NULL)
1807                 return 0;
1808
1809         int count = 0;
1810         pingobj_iter_t *iter = obj->head;
1811         while (iter) {
1812                 count++;
1813                 iter = iter->next;
1814         }
1815         return count;
1816 }
1817
1818 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1819                 void *buffer, size_t *buffer_len)
1820 {
1821         int ret = EINVAL;
1822
1823         size_t orig_buffer_len = *buffer_len;
1824
1825         if ((iter == NULL) || (buffer_len == NULL))
1826                 return (-1);
1827
1828         if ((buffer == NULL) && (*buffer_len != 0 ))
1829                 return (-1);
1830
1831         switch (info)
1832         {
1833                 case PING_INFO_USERNAME:
1834                         ret = ENOMEM;
1835                         *buffer_len = strlen (iter->username) + 1;
1836                         if (orig_buffer_len <= *buffer_len)
1837                                 break;
1838                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1839                          * will copy `*buffer_len' and pad the rest of
1840                          * `buffer' with null-bytes */
1841                         strncpy (buffer, iter->username, orig_buffer_len);
1842                         ret = 0;
1843                         break;
1844
1845                 case PING_INFO_HOSTNAME:
1846                         ret = ENOMEM;
1847                         *buffer_len = strlen (iter->hostname) + 1;
1848                         if (orig_buffer_len < *buffer_len)
1849                                 break;
1850                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1851                          * will copy `*buffer_len' and pad the rest of
1852                          * `buffer' with null-bytes */
1853                         strncpy (buffer, iter->hostname, orig_buffer_len);
1854                         ret = 0;
1855                         break;
1856
1857                 case PING_INFO_ADDRESS:
1858                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1859                                         iter->addrlen,
1860                                         (char *) buffer,
1861                                         *buffer_len,
1862                                         NULL, 0,
1863                                         NI_NUMERICHOST);
1864                         if (ret != 0)
1865                         {
1866                                 if ((ret == EAI_MEMORY)
1867 #ifdef EAI_OVERFLOW
1868                                                 || (ret == EAI_OVERFLOW)
1869 #endif
1870                                    )
1871                                         ret = ENOMEM;
1872 #if defined(EAI_SYSTEM)
1873                                 else if (ret == EAI_SYSTEM)
1874                                         ret = errno;
1875 #endif
1876                                 else
1877                                         ret = EINVAL;
1878                         }
1879                         break;
1880
1881                 case PING_INFO_FAMILY:
1882                         ret = ENOMEM;
1883                         *buffer_len = sizeof (int);
1884                         if (orig_buffer_len < sizeof (int))
1885                                 break;
1886                         *((int *) buffer) = iter->addrfamily;
1887                         ret = 0;
1888                         break;
1889
1890                 case PING_INFO_LATENCY:
1891                         ret = ENOMEM;
1892                         *buffer_len = sizeof (double);
1893                         if (orig_buffer_len < sizeof (double))
1894                                 break;
1895                         *((double *) buffer) = iter->latency;
1896                         ret = 0;
1897                         break;
1898
1899                 case PING_INFO_DROPPED:
1900                         ret = ENOMEM;
1901                         *buffer_len = sizeof (uint32_t);
1902                         if (orig_buffer_len < sizeof (uint32_t))
1903                                 break;
1904                         *((uint32_t *) buffer) = iter->dropped;
1905                         ret = 0;
1906                         break;
1907
1908                 case PING_INFO_SEQUENCE:
1909                         ret = ENOMEM;
1910                         *buffer_len = sizeof (unsigned int);
1911                         if (orig_buffer_len < sizeof (unsigned int))
1912                                 break;
1913                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1914                         ret = 0;
1915                         break;
1916
1917                 case PING_INFO_IDENT:
1918                         ret = ENOMEM;
1919                         *buffer_len = sizeof (uint16_t);
1920                         if (orig_buffer_len < sizeof (uint16_t))
1921                                 break;
1922                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1923                         ret = 0;
1924                         break;
1925
1926                 case PING_INFO_DATA:
1927                         ret = ENOMEM;
1928                         *buffer_len = strlen (iter->data);
1929                         if (orig_buffer_len < *buffer_len)
1930                                 break;
1931                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1932                         ret = 0;
1933                         break;
1934
1935                 case PING_INFO_RECV_TTL:
1936                         ret = ENOMEM;
1937                         *buffer_len = sizeof (int);
1938                         if (orig_buffer_len < sizeof (int))
1939                                 break;
1940                         *((int *) buffer) = iter->recv_ttl;
1941                         ret = 0;
1942                         break;
1943
1944                 case PING_INFO_RECV_QOS:
1945                         ret = ENOMEM;
1946                         if (*buffer_len>sizeof(unsigned)) *buffer_len=sizeof(unsigned);
1947                         if (!*buffer_len) *buffer_len=1;
1948                         if (orig_buffer_len < *buffer_len)
1949                                 break;
1950                         memcpy(buffer,&iter->recv_qos,*buffer_len);
1951                         ret = 0;
1952                         break;
1953         }
1954
1955         return (ret);
1956 } /* ping_iterator_get_info */
1957
1958 void *ping_iterator_get_context (pingobj_iter_t *iter)
1959 {
1960         if (iter == NULL)
1961                 return (NULL);
1962         return (iter->context);
1963 }
1964
1965 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1966 {
1967         if (iter == NULL)
1968                 return;
1969         iter->context = context;
1970 }