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