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 == NULL)
 961                 return;
 962
 963         free (ph->username);
 964         free (ph->hostname);
 965         free (ph->data);
 966
 967         free (ph);
 968 }
 969
 970 /* ping_open_socket opens, initializes and returns a new raw socket to use for
 971  * ICMPv4 or ICMPv6 packets. addrfam must be either AF_INET or AF_INET6. On
 972  * error, -1 is returned and obj->errmsg is set appropriately. */
 973 static int ping_open_socket(pingobj_t *obj, int addrfam)
 974 {
 975         int fd;
 976         if (addrfam == AF_INET6)
 977         {
 978                 fd = socket(addrfam, SOCK_RAW, IPPROTO_ICMPV6);
 979         }
 980         else if (addrfam == AF_INET)
 981         {
 982                 fd = socket(addrfam, SOCK_RAW, IPPROTO_ICMP);
 983         }
 984         else /* this should not happen */
 985         {
 986                 ping_set_error (obj, "ping_open_socket", "Unknown address family");
 987                 dprintf ("Unknown address family: %i\n", addrfam);
 988                 return -1;
 989         }
 990
 991         if (fd == -1)
 992         {
 993                 ping_set_errno (obj, errno);
 994 #if WITH_DEBUG
 995                 char errbuf[PING_ERRMSG_LEN];
 996                 dprintf ("socket: %s\n",
 997                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 998 #endif
 999                 return -1;
1000         }
1001         else if (fd >= FD_SETSIZE)
1002         {
1003                 ping_set_errno (obj, EMFILE);
1004                 dprintf ("socket(2) returned file descriptor %d, which is above the file "
1005                          "descriptor limit for select(2) (FD_SETSIZE = %d)\n",
1006                          fd, FD_SETSIZE);
1007                 close (fd);
1008                 return -1;
1009         }
1010
1011         if (obj->srcaddr != NULL)
1012         {
1013                 assert (obj->srcaddrlen > 0);
1014                 assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1015
1016                 if (bind (fd, obj->srcaddr, obj->srcaddrlen) == -1)
1017                 {
1018                         ping_set_errno (obj, errno);
1019 #if WITH_DEBUG
1020                         char errbuf[PING_ERRMSG_LEN];
1021                         dprintf ("bind: %s\n",
1022                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1023 #endif
1024                         close (fd);
1025                         return -1;
1026                 }
1027         }
1028
1029 #ifdef SO_BINDTODEVICE
1030         if (obj->device != NULL)
1031         {
1032                 if (setsockopt (fd, SOL_SOCKET, SO_BINDTODEVICE,
1033                                 obj->device, strlen (obj->device) + 1) != 0)
1034                 {
1035                         ping_set_errno (obj, errno);
1036 #if WITH_DEBUG
1037                         char errbuf[PING_ERRMSG_LEN];
1038                         dprintf ("setsockopt (SO_BINDTODEVICE): %s\n",
1039                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1040 #endif
1041                         close (fd);
1042                         return -1;
1043                 }
1044         }
1045 #endif /* SO_BINDTODEVICE */
1046 #ifdef SO_MARK
1047         if (obj->set_mark)
1048         {
1049                 if (setsockopt(fd, SOL_SOCKET, SO_MARK,
1050                                 &obj->mark, sizeof(obj->mark)) != 0)
1051                 {
1052                         ping_set_errno (obj, errno);
1053 #if WITH_DEBUG
1054                         char errbuf[PING_ERRMSG_LEN];
1055                         dprintf ("setsockopt (SO_MARK): %s\n",
1056                                  sstrerror (errno, errbuf, sizeof (errbuf)));
1057 #endif
1058                         close (fd);
1059                         return -1;
1060                 }
1061         }
1062 #endif
1063 #ifdef SO_TIMESTAMP
1064         if (1) /* {{{ */
1065         {
1066                 int status;
1067                 int opt = 1;
1068
1069                 status = setsockopt (fd,
1070                                 SOL_SOCKET, SO_TIMESTAMP,
1071                                 &opt, sizeof (opt));
1072                 if (status != 0)
1073                 {
1074                         ping_set_errno (obj, errno);
1075 #if WITH_DEBUG
1076                         char errbuf[PING_ERRMSG_LEN];
1077                         dprintf ("setsockopt (SO_TIMESTAMP): %s\n",
1078                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1079 #endif
1080                         close (fd);
1081                         return -1;
1082                 }
1083         } /* }}} if (1) */
1084 #endif /* SO_TIMESTAMP */
1085
1086         if (addrfam == AF_INET)
1087         {
1088                 int opt;
1089
1090 #ifdef IP_RECVTOS
1091                 /* Enable receiving the TOS field */
1092                 opt = 1;
1093                 setsockopt (fd, IPPROTO_IP, IP_RECVTOS,
1094                                 &opt, sizeof (opt));
1095 #endif /* IP_RECVTOS */
1096
1097                 /* Enable receiving the TTL field */
1098                 opt = 1;
1099                 setsockopt (fd, IPPROTO_IP, IP_RECVTTL,
1100                                 &opt, sizeof (opt));
1101         }
1102 #if defined(IPV6_RECVHOPLIMIT) || defined(IPV6_RECVTCLASS)
1103         else if (addrfam == AF_INET6)
1104         {
1105                 int opt;
1106
1107 # if defined(IPV6_RECVHOPLIMIT)
1108                 /* For details see RFC 3542, section 6.3. */
1109                 opt = 1;
1110                 setsockopt (fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1111                                 &opt, sizeof (opt));
1112 # endif /* IPV6_RECVHOPLIMIT */
1113
1114 # if defined(IPV6_RECVTCLASS)
1115                 /* For details see RFC 3542, section 6.5. */
1116                 opt = 1;
1117                 setsockopt (fd, IPPROTO_IPV6, IPV6_RECVTCLASS,
1118                                 &opt, sizeof (opt));
1119 # endif /* IPV6_RECVTCLASS */
1120         }
1121 #endif /* IPV6_RECVHOPLIMIT || IPV6_RECVTCLASS */
1122
1123         return fd;
1124 }
1125
1126 /*
1127  * public methods
1128  */
1129 const char *ping_get_error (pingobj_t *obj)
1130 {
1131         if (obj == NULL)
1132                 return (NULL);
1133         return (obj->errmsg);
1134 }
1135
1136 pingobj_t *ping_construct (void)
1137 {
1138         pingobj_t *obj;
1139
1140         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
1141                 return (NULL);
1142         memset (obj, 0, sizeof (pingobj_t));
1143
1144         obj->timeout    = PING_DEF_TIMEOUT;
1145         obj->ttl        = PING_DEF_TTL;
1146         obj->addrfamily = PING_DEF_AF;
1147         obj->data       = strdup (PING_DEF_DATA);
1148         obj->qos        = 0;
1149         obj->fd4        = -1;
1150         obj->fd6        = -1;
1151
1152         return (obj);
1153 }
1154
1155 void ping_destroy (pingobj_t *obj)
1156 {
1157         pinghost_t *current;
1158         pinghost_t *next;
1159
1160         if (obj == NULL)
1161                 return;
1162
1163         current = obj->head;
1164         next = NULL;
1165
1166         while (current != NULL)
1167         {
1168                 next = current->next;
1169                 ping_free (current);
1170                 current = next;
1171         }
1172
1173         free (obj->data);
1174         free (obj->srcaddr);
1175         free (obj->device);
1176
1177         if (obj->fd4 != -1)
1178                 close(obj->fd4);
1179
1180         if (obj->fd6 != -1)
1181                 close(obj->fd6);
1182
1183         free (obj);
1184
1185         return;
1186 }
1187
1188 int ping_setopt (pingobj_t *obj, int option, void *value)
1189 {
1190         int ret = 0;
1191
1192         if ((obj == NULL) || (value == NULL))
1193                 return (-1);
1194
1195         switch (option)
1196         {
1197                 case PING_OPT_QOS:
1198                 {
1199                         obj->qos = *((uint8_t *) value);
1200                         ret = ping_set_qos (obj, obj->qos);
1201                         break;
1202                 }
1203
1204                 case PING_OPT_TIMEOUT:
1205                         obj->timeout = *((double *) value);
1206                         if (obj->timeout < 0.0)
1207                         {
1208                                 obj->timeout = PING_DEF_TIMEOUT;
1209                                 ret = -1;
1210                         }
1211                         break;
1212
1213                 case PING_OPT_TTL:
1214                         ret = *((int *) value);
1215                         if ((ret < 1) || (ret > 255))
1216                         {
1217                                 obj->ttl = PING_DEF_TTL;
1218                                 ret = -1;
1219                         }
1220                         else
1221                         {
1222                                 obj->ttl = ret;
1223                                 ret = ping_set_ttl (obj, obj->ttl);
1224                         }
1225                         break;
1226
1227                 case PING_OPT_AF:
1228                         obj->addrfamily = *((int *) value);
1229                         if ((obj->addrfamily != AF_UNSPEC)
1230                                         && (obj->addrfamily != AF_INET)
1231                                         && (obj->addrfamily != AF_INET6))
1232                         {
1233                                 obj->addrfamily = PING_DEF_AF;
1234                                 ret = -1;
1235                         }
1236                         if (obj->srcaddr != NULL)
1237                         {
1238                                 free (obj->srcaddr);
1239                                 obj->srcaddr = NULL;
1240                         }
1241                         break;
1242
1243                 case PING_OPT_DATA:
1244                         if (obj->data != NULL)
1245                         {
1246                                 free (obj->data);
1247                                 obj->data = NULL;
1248                         }
1249                         obj->data = strdup ((const char *) value);
1250                         break;
1251
1252                 case PING_OPT_SOURCE:
1253                 {
1254                         char            *hostname = (char *) value;
1255                         struct addrinfo  ai_hints;
1256                         struct addrinfo *ai_list;
1257                         int              status;
1258 #if WITH_DEBUG
1259                         if (obj->addrfamily != AF_UNSPEC)
1260                         {
1261                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1262                         }
1263 #endif
1264                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1265                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1266 #if defined(AI_ADDRCONFIG)
1267                         ai_hints.ai_flags = AI_ADDRCONFIG;
1268 #endif
1269                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1270                         if (status != 0)
1271                         {
1272 #if defined(EAI_SYSTEM)
1273                                 char errbuf[PING_ERRMSG_LEN];
1274 #endif
1275                                 ping_set_error (obj, "getaddrinfo",
1276 #if defined(EAI_SYSTEM)
1277                                                 (status == EAI_SYSTEM)
1278                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1279 #endif
1280                                                 gai_strerror (status));
1281                                 ret = -1;
1282                                 break;
1283                         }
1284 #if WITH_DEBUG
1285                         if (ai_list->ai_next != NULL)
1286                         {
1287                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1288                         }
1289 #endif
1290                         if (obj->srcaddr == NULL)
1291                         {
1292                                 obj->srcaddrlen = 0;
1293                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1294                                 if (obj->srcaddr == NULL)
1295                                 {
1296                                         ping_set_errno (obj, errno);
1297                                         ret = -1;
1298                                         freeaddrinfo (ai_list);
1299                                         break;
1300                                 }
1301                         }
1302                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1303                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1304                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1305                                         ai_list->ai_addrlen);
1306                         obj->srcaddrlen = ai_list->ai_addrlen;
1307                         obj->addrfamily = ai_list->ai_family;
1308
1309                         freeaddrinfo (ai_list);
1310                 } /* case PING_OPT_SOURCE */
1311                 break;
1312
1313                 case PING_OPT_DEVICE:
1314                 {
1315 #ifdef SO_BINDTODEVICE
1316                         char *device = strdup ((char *) value);
1317
1318                         if (device == NULL)
1319                         {
1320                                 ping_set_errno (obj, errno);
1321                                 ret = -1;
1322                                 break;
1323                         }
1324
1325                         if (obj->device != NULL)
1326                                 free (obj->device);
1327                         obj->device = device;
1328 #else /* ! SO_BINDTODEVICE */
1329                         ping_set_errno (obj, ENOTSUP);
1330                         ret = -1;
1331 #endif /* ! SO_BINDTODEVICE */
1332                 } /* case PING_OPT_DEVICE */
1333                 break;
1334
1335                 case PING_OPT_MARK:
1336                 {
1337 #ifdef SO_MARK
1338                         obj->mark     = *(int*)(value);
1339                         obj->set_mark = 1;
1340 #else /* SO_MARK */
1341                         ping_set_errno (obj, ENOTSUP);
1342                         ret = -1;
1343 #endif /* !SO_MARK */
1344
1345                 } /* case PING_OPT_MARK */
1346                 break;
1347
1348                 default:
1349                         ret = -2;
1350         } /* switch (option) */
1351
1352         return (ret);
1353 } /* int ping_setopt */
1354
1355 int ping_send (pingobj_t *obj)
1356 {
1357         pinghost_t *ptr;
1358
1359         struct timeval endtime;
1360         struct timeval nowtime;
1361         struct timeval timeout;
1362
1363         _Bool need_ipv4_socket = 0;
1364         _Bool need_ipv6_socket = 0;
1365
1366         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
1367         {
1368                 ptr->latency  = -1.0;
1369                 ptr->recv_ttl = -1;
1370
1371                 if (ptr->addrfamily == AF_INET)
1372                         need_ipv4_socket = 1;
1373                 else if (ptr->addrfamily == AF_INET6)
1374                         need_ipv6_socket = 1;
1375         }
1376
1377         if (!need_ipv4_socket && !need_ipv6_socket)
1378         {
1379                 ping_set_error (obj, "ping_send", "No hosts to ping");
1380                 return (-1);
1381         }
1382
1383         if (need_ipv4_socket && obj->fd4 == -1)
1384         {
1385                 obj->fd4 = ping_open_socket(obj, AF_INET);
1386                 if (obj->fd4 == -1)
1387                         return (-1);
1388                 ping_set_ttl (obj, obj->ttl);
1389                 ping_set_qos (obj, obj->qos);
1390         }
1391         if (need_ipv6_socket && obj->fd6 == -1)
1392         {
1393                 obj->fd6 = ping_open_socket(obj, AF_INET6);
1394                 if (obj->fd6 == -1)
1395                         return (-1);
1396                 ping_set_ttl (obj, obj->ttl);
1397                 ping_set_qos (obj, obj->qos);
1398         }
1399
1400         if (gettimeofday (&nowtime, NULL) == -1)
1401         {
1402                 ping_set_errno (obj, errno);
1403                 return (-1);
1404         }
1405
1406         /* Set up timeout */
1407         timeout.tv_sec = (time_t) obj->timeout;
1408         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
1409
1410         dprintf ("Set timeout to %i.%06i seconds\n",
1411                         (int) timeout.tv_sec,
1412                         (int) timeout.tv_usec);
1413
1414         ping_timeval_add (&nowtime, &timeout, &endtime);
1415
1416         /* host_to_ping points to the host to which to send the next ping. The
1417          * pointer is advanced to the next host in the linked list after the
1418          * ping has been sent. If host_to_ping is NULL, no more pings need to be
1419          * send out. */
1420         pinghost_t *host_to_ping = obj->head;
1421
1422         /* pings_in_flight is the number of hosts we sent a "ping" to but didn't
1423          * receive a "pong" yet. */
1424         int pings_in_flight = 0;
1425
1426         /* pongs_received is the number of echo replies received. Unless there
1427          * is an error, this is used as the return value of ping_send(). */
1428         int pongs_received = 0;
1429
1430         int error_count = 0;
1431
1432         while (pings_in_flight > 0 || host_to_ping != NULL)
1433         {
1434                 fd_set read_fds;
1435                 fd_set write_fds;
1436
1437                 int write_fd = -1;
1438                 int max_fd = -1;
1439
1440                 FD_ZERO (&read_fds);
1441                 FD_ZERO (&write_fds);
1442
1443                 if (obj->fd4 != -1)
1444                 {
1445                         FD_SET(obj->fd4, &read_fds);
1446                         if (host_to_ping != NULL && host_to_ping->addrfamily == AF_INET)
1447                                 write_fd = obj->fd4;
1448
1449                         if (max_fd < obj->fd4)
1450                                 max_fd = obj->fd4;
1451                 }
1452
1453                 if (obj->fd6 != -1)
1454                 {
1455                         FD_SET(obj->fd6, &read_fds);
1456                         if (host_to_ping != NULL && host_to_ping->addrfamily == AF_INET6)
1457                                 write_fd = obj->fd6;
1458
1459                         if (max_fd < obj->fd6)
1460                                 max_fd = obj->fd6;
1461                 }
1462
1463                 if (write_fd != -1)
1464                         FD_SET(write_fd, &write_fds);
1465
1466                 assert (max_fd != -1);
1467                 assert (max_fd < FD_SETSIZE);
1468
1469                 if (gettimeofday (&nowtime, NULL) == -1)
1470                 {
1471                         ping_set_errno (obj, errno);
1472                         return (-1);
1473                 }
1474
1475                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
1476                         break;
1477
1478                 dprintf ("Waiting on %i sockets for %u.%06u seconds\n",
1479                                 ((obj->fd4 != -1) ? 1 : 0) + ((obj->fd6 != -1) ? 1 : 0),
1480                                 (unsigned) timeout.tv_sec,
1481                                 (unsigned) timeout.tv_usec);
1482
1483                 int status = select (max_fd + 1, &read_fds, &write_fds, NULL, &timeout);
1484
1485                 if (gettimeofday (&nowtime, NULL) == -1)
1486                 {
1487                         ping_set_errno (obj, errno);
1488                         return (-1);
1489                 }
1490
1491                 if (status == -1)
1492                 {
1493                         ping_set_errno (obj, errno);
1494                         dprintf ("select: %s\n", obj->errmsg);
1495                         return (-1);
1496                 }
1497                 else if (status == 0)
1498                 {
1499                         dprintf ("select timed out\n");
1500
1501                         pinghost_t *ph;
1502                         for (ph = obj->head; ph != NULL; ph = ph->next)
1503                                 if (ph->latency < 0.0)
1504                                         ph->dropped++;
1505                         break;
1506                 }
1507
1508                 /* first, check if we can receive a reply ... */
1509                 if (obj->fd6  != -1 && FD_ISSET (obj->fd6, &read_fds))
1510                 {
1511                         if (ping_receive_one (obj, &nowtime, AF_INET6) == 0)
1512                         {
1513                                 pings_in_flight--;
1514                                 pongs_received++;
1515                         }
1516                         continue;
1517                 }
1518                 if (obj->fd4 != -1 && FD_ISSET (obj->fd4, &read_fds))
1519                 {
1520                         if (ping_receive_one (obj, &nowtime, AF_INET) == 0)
1521                         {
1522                                 pings_in_flight--;
1523                                 pongs_received++;
1524                         }
1525                         continue;
1526                 }
1527
1528                 /* ... and if no reply is available to read, continue sending
1529                  * out pings. */
1530
1531                 /* this condition should always be true. We keep it for
1532                  * consistency with the read blocks above and just to be on the
1533                  * safe side. */
1534                 if (write_fd != -1 && FD_ISSET (write_fd, &write_fds))
1535                 {
1536                         if (ping_send_one (obj, host_to_ping, write_fd) == 0)
1537                                 pings_in_flight++;
1538                         else
1539                                 error_count++;
1540                         host_to_ping = host_to_ping->next;
1541                         continue;
1542                 }
1543         } /* while (1) */
1544
1545         if (error_count)
1546                 return (-1 * error_count);
1547         return (pongs_received);
1548 } /* int ping_send */
1549
1550 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1551 {
1552         while (ph != NULL)
1553         {
1554                 if (strcasecmp (ph->username, host) == 0)
1555                         break;
1556
1557                 ph = ph->next;
1558         }
1559
1560         return (ph);
1561 }
1562
1563 int ping_host_add (pingobj_t *obj, const char *host)
1564 {
1565         pinghost_t *ph;
1566
1567         struct addrinfo  ai_hints;
1568         struct addrinfo *ai_list, *ai_ptr;
1569         int              ai_return;
1570
1571         if ((obj == NULL) || (host == NULL))
1572                 return (-1);
1573
1574         dprintf ("host = %s\n", host);
1575
1576         if (ping_host_search (obj->head, host) != NULL)
1577                 return (0);
1578
1579         memset (&ai_hints, '\0', sizeof (ai_hints));
1580         ai_hints.ai_flags     = 0;
1581 #ifdef AI_ADDRCONFIG
1582         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1583 #endif
1584 #ifdef AI_CANONNAME
1585         ai_hints.ai_flags    |= AI_CANONNAME;
1586 #endif
1587         ai_hints.ai_family    = obj->addrfamily;
1588         ai_hints.ai_socktype  = SOCK_RAW;
1589
1590         if ((ph = ping_alloc ()) == NULL)
1591         {
1592                 dprintf ("Out of memory!\n");
1593                 return (-1);
1594         }
1595
1596         if ((ph->username = strdup (host)) == NULL)
1597         {
1598                 dprintf ("Out of memory!\n");
1599                 ping_set_errno (obj, errno);
1600                 ping_free (ph);
1601                 return (-1);
1602         }
1603
1604         if ((ph->hostname = strdup (host)) == NULL)
1605         {
1606                 dprintf ("Out of memory!\n");
1607                 ping_set_errno (obj, errno);
1608                 ping_free (ph);
1609                 return (-1);
1610         }
1611
1612         /* obj->data is not garuanteed to be != NULL */
1613         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1614         {
1615                 dprintf ("Out of memory!\n");
1616                 ping_set_errno (obj, errno);
1617                 ping_free (ph);
1618                 return (-1);
1619         }
1620
1621         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1622         {
1623 #if defined(EAI_SYSTEM)
1624                 char errbuf[PING_ERRMSG_LEN];
1625 #endif
1626                 dprintf ("getaddrinfo failed\n");
1627                 ping_set_error (obj, "getaddrinfo",
1628 #if defined(EAI_SYSTEM)
1629                                                 (ai_return == EAI_SYSTEM)
1630                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1631 #endif
1632                                 gai_strerror (ai_return));
1633                 ping_free (ph);
1634                 return (-1);
1635         }
1636
1637         if (ai_list == NULL)
1638                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1639
1640         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1641         {
1642                 if (ai_ptr->ai_family == AF_INET)
1643                 {
1644                         ai_ptr->ai_socktype = SOCK_RAW;
1645                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1646                 }
1647                 else if (ai_ptr->ai_family == AF_INET6)
1648                 {
1649                         ai_ptr->ai_socktype = SOCK_RAW;
1650                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1651                 }
1652                 else
1653                 {
1654                         char errmsg[PING_ERRMSG_LEN];
1655
1656                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1657                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1658
1659                         dprintf ("%s", errmsg);
1660                         ping_set_error (obj, "getaddrinfo", errmsg);
1661                         continue;
1662                 }
1663
1664                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1665                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1666                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1667                 ph->addrlen = ai_ptr->ai_addrlen;
1668                 ph->addrfamily = ai_ptr->ai_family;
1669
1670 #ifdef AI_CANONNAME
1671                 if ((ai_ptr->ai_canonname != NULL)
1672                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1673                 {
1674                         char *old_hostname;
1675
1676                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1677                                         ph->hostname, ai_ptr->ai_canonname);
1678
1679                         old_hostname = ph->hostname;
1680                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1681                         {
1682                                 /* strdup failed, falling back to old hostname */
1683                                 ph->hostname = old_hostname;
1684                         }
1685                         else if (old_hostname != NULL)
1686                         {
1687                                 free (old_hostname);
1688                         }
1689                 }
1690 #endif /* AI_CANONNAME */
1691         } /* for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next) */
1692
1693         freeaddrinfo (ai_list);
1694
1695         /*
1696          * Adding in the front is much easier, but then the iterator will
1697          * return the host that was added last as first host. That's just not
1698          * nice. -octo
1699          */
1700         if (obj->head == NULL)
1701         {
1702                 obj->head = ph;
1703         }
1704         else
1705         {
1706                 pinghost_t *hptr;
1707
1708                 hptr = obj->head;
1709                 while (hptr->next != NULL)
1710                         hptr = hptr->next;
1711
1712                 assert ((hptr != NULL) && (hptr->next == NULL));
1713                 hptr->next = ph;
1714         }
1715
1716         ph->table_next = obj->table[ph->ident % PING_TABLE_LEN];
1717         obj->table[ph->ident % PING_TABLE_LEN] = ph;
1718
1719         return (0);
1720 } /* int ping_host_add */
1721
1722 int ping_host_remove (pingobj_t *obj, const char *host)
1723 {
1724         pinghost_t *pre, *cur, *target;
1725
1726         if ((obj == NULL) || (host == NULL))
1727                 return (-1);
1728
1729         pre = NULL;
1730         cur = obj->head;
1731
1732         while (cur != NULL)
1733         {
1734                 if (strcasecmp (host, cur->username) == 0)
1735                         break;
1736
1737                 pre = cur;
1738                 cur = cur->next;
1739         }
1740
1741         if (cur == NULL)
1742         {
1743                 ping_set_error (obj, "ping_host_remove", "Host not found");
1744                 return (-1);
1745         }
1746
1747         if (pre == NULL)
1748                 obj->head = cur->next;
1749         else
1750                 pre->next = cur->next;
1751
1752         target = cur;
1753         pre = NULL;
1754
1755         cur = obj->table[target->ident % PING_TABLE_LEN];
1756
1757         while (cur != NULL)
1758         {
1759                 if (cur == target)
1760                         break;
1761
1762                 pre = cur;
1763                 cur = cur->table_next;
1764         }
1765
1766         if (cur == NULL)
1767         {
1768                 ping_set_error(obj, "ping_host_remove", "Host not found (T)");
1769                 ping_free(target);
1770                 return (-1);
1771         }
1772
1773         if (pre == NULL)
1774                 obj->table[target->ident % PING_TABLE_LEN] = cur->table_next;
1775         else
1776                 pre->table_next = cur->table_next;
1777
1778         ping_free (cur);
1779
1780         return (0);
1781 }
1782
1783 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1784 {
1785         if (obj == NULL)
1786                 return (NULL);
1787         return ((pingobj_iter_t *) obj->head);
1788 }
1789
1790 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1791 {
1792         if (iter == NULL)
1793                 return (NULL);
1794         return ((pingobj_iter_t *) iter->next);
1795 }
1796
1797 int ping_iterator_count (pingobj_t *obj)
1798 {
1799         if (obj == NULL)
1800                 return 0;
1801
1802         int count = 0;
1803         pingobj_iter_t *iter = obj->head;
1804         while (iter) {
1805                 count++;
1806                 iter = iter->next;
1807         }
1808         return count;
1809 }
1810
1811 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1812                 void *buffer, size_t *buffer_len)
1813 {
1814         int ret = EINVAL;
1815
1816         size_t orig_buffer_len = *buffer_len;
1817
1818         if ((iter == NULL) || (buffer_len == NULL))
1819                 return (-1);
1820
1821         if ((buffer == NULL) && (*buffer_len != 0 ))
1822                 return (-1);
1823
1824         switch (info)
1825         {
1826                 case PING_INFO_USERNAME:
1827                         ret = ENOMEM;
1828                         *buffer_len = strlen (iter->username) + 1;
1829                         if (orig_buffer_len <= *buffer_len)
1830                                 break;
1831                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1832                          * will copy `*buffer_len' and pad the rest of
1833                          * `buffer' with null-bytes */
1834                         strncpy (buffer, iter->username, orig_buffer_len);
1835                         ret = 0;
1836                         break;
1837
1838                 case PING_INFO_HOSTNAME:
1839                         ret = ENOMEM;
1840                         *buffer_len = strlen (iter->hostname) + 1;
1841                         if (orig_buffer_len < *buffer_len)
1842                                 break;
1843                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1844                          * will copy `*buffer_len' and pad the rest of
1845                          * `buffer' with null-bytes */
1846                         strncpy (buffer, iter->hostname, orig_buffer_len);
1847                         ret = 0;
1848                         break;
1849
1850                 case PING_INFO_ADDRESS:
1851                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1852                                         iter->addrlen,
1853                                         (char *) buffer,
1854                                         *buffer_len,
1855                                         NULL, 0,
1856                                         NI_NUMERICHOST);
1857                         if (ret != 0)
1858                         {
1859                                 if ((ret == EAI_MEMORY)
1860 #ifdef EAI_OVERFLOW
1861                                                 || (ret == EAI_OVERFLOW)
1862 #endif
1863                                    )
1864                                         ret = ENOMEM;
1865 #if defined(EAI_SYSTEM)
1866                                 else if (ret == EAI_SYSTEM)
1867                                         ret = errno;
1868 #endif
1869                                 else
1870                                         ret = EINVAL;
1871                         }
1872                         break;
1873
1874                 case PING_INFO_FAMILY:
1875                         ret = ENOMEM;
1876                         *buffer_len = sizeof (int);
1877                         if (orig_buffer_len < sizeof (int))
1878                                 break;
1879                         *((int *) buffer) = iter->addrfamily;
1880                         ret = 0;
1881                         break;
1882
1883                 case PING_INFO_LATENCY:
1884                         ret = ENOMEM;
1885                         *buffer_len = sizeof (double);
1886                         if (orig_buffer_len < sizeof (double))
1887                                 break;
1888                         *((double *) buffer) = iter->latency;
1889                         ret = 0;
1890                         break;
1891
1892                 case PING_INFO_DROPPED:
1893                         ret = ENOMEM;
1894                         *buffer_len = sizeof (uint32_t);
1895                         if (orig_buffer_len < sizeof (uint32_t))
1896                                 break;
1897                         *((uint32_t *) buffer) = iter->dropped;
1898                         ret = 0;
1899                         break;
1900
1901                 case PING_INFO_SEQUENCE:
1902                         ret = ENOMEM;
1903                         *buffer_len = sizeof (unsigned int);
1904                         if (orig_buffer_len < sizeof (unsigned int))
1905                                 break;
1906                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1907                         ret = 0;
1908                         break;
1909
1910                 case PING_INFO_IDENT:
1911                         ret = ENOMEM;
1912                         *buffer_len = sizeof (uint16_t);
1913                         if (orig_buffer_len < sizeof (uint16_t))
1914                                 break;
1915                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1916                         ret = 0;
1917                         break;
1918
1919                 case PING_INFO_DATA:
1920                         ret = ENOMEM;
1921                         *buffer_len = strlen (iter->data);
1922                         if (orig_buffer_len < *buffer_len)
1923                                 break;
1924                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1925                         ret = 0;
1926                         break;
1927
1928                 case PING_INFO_RECV_TTL:
1929                         ret = ENOMEM;
1930                         *buffer_len = sizeof (int);
1931                         if (orig_buffer_len < sizeof (int))
1932                                 break;
1933                         *((int *) buffer) = iter->recv_ttl;
1934                         ret = 0;
1935                         break;
1936
1937                 case PING_INFO_RECV_QOS:
1938                         ret = ENOMEM;
1939                         if (*buffer_len>sizeof(unsigned)) *buffer_len=sizeof(unsigned);
1940                         if (!*buffer_len) *buffer_len=1;
1941                         if (orig_buffer_len < *buffer_len)
1942                                 break;
1943                         memcpy(buffer,&iter->recv_qos,*buffer_len);
1944                         ret = 0;
1945                         break;
1946         }
1947
1948         return (ret);
1949 } /* ping_iterator_get_info */
1950
1951 void *ping_iterator_get_context (pingobj_iter_t *iter)
1952 {
1953         if (iter == NULL)
1954                 return (NULL);
1955         return (iter->context);
1956 }
1957
1958 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1959 {
1960         if (iter == NULL)
1961                 return;
1962         iter->context = context;
1963 }