src/liboping.c

   1 /**
   2  * Object oriented C module to send ICMP and ICMPv6 `echo's.
   3  * Copyright (C) 2006-2010  Florian octo Forster <octo at verplant.org>
   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 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #if STDC_HEADERS
  25 # include <stdlib.h>
  26 # include <stdio.h>
  27 # include <string.h>
  28 # include <inttypes.h>
  29 # include <errno.h>
  30 # include <assert.h>
  31 #else
  32 # error "You don't have the standard C99 header files installed"
  33 #endif /* STDC_HEADERS */
  34
  35 #ifdef HAVE_STDINT_H
  36 # include <stdint.h>
  37 #endif
  38
  39 #if HAVE_UNISTD_H
  40 # include <unistd.h>
  41 #endif
  42
  43 #if HAVE_FCNTL_H
  44 # include <fcntl.h>
  45 #endif
  46 #if HAVE_SYS_TYPES_H
  47 # include <sys/types.h>
  48 #endif
  49 #if HAVE_SYS_STAT_H
  50 # include <sys/stat.h>
  51 #endif
  52
  53 #if TIME_WITH_SYS_TIME
  54 # include <sys/time.h>
  55 # include <time.h>
  56 #else
  57 # if HAVE_SYS_TIME_H
  58 #  include <sys/time.h>
  59 # else
  60 #  include <time.h>
  61 # endif
  62 #endif
  63
  64 #if HAVE_SYS_SOCKET_H
  65 # include <sys/socket.h>
  66 #endif
  67
  68 #if HAVE_NETDB_H
  69 # include <netdb.h>
  70 #endif
  71
  72 #if HAVE_NETINET_IN_SYSTM_H
  73 # include <netinet/in_systm.h>
  74 #endif
  75 #if HAVE_NETINET_IN_H
  76 # include <netinet/in.h>
  77 #endif
  78 #if HAVE_NETINET_IP_H
  79 # include <netinet/ip.h>
  80 #endif
  81 #if HAVE_NETINET_IP_ICMP_H
  82 # include <netinet/ip_icmp.h>
  83 #endif
  84 #ifdef HAVE_NETINET_IP_VAR_H
  85 # include <netinet/ip_var.h>
  86 #endif
  87 #if HAVE_NETINET_IP6_H
  88 # include <netinet/ip6.h>
  89 #endif
  90 #if HAVE_NETINET_ICMP6_H
  91 # include <netinet/icmp6.h>
  92 #endif
  93
  94 #include "oping.h"
  95
  96 #if WITH_DEBUG
  97 # define dprintf(...) printf ("%s[%4i]: %-20s: ", __FILE__, __LINE__, __FUNCTION__); printf (__VA_ARGS__)
  98 #else
  99 # define dprintf(...) /**/
 100 #endif
 101
 102 #define PING_ERRMSG_LEN 256
 103
 104 struct pinghost
 105 {
 106         /* username: name passed in by the user */
 107         char                    *username;
 108         /* hostname: name returned by the reverse lookup */
 109         char                    *hostname;
 110         struct sockaddr_storage *addr;
 111         socklen_t                addrlen;
 112         int                      addrfamily;
 113         int                      fd;
 114         int                      ident;
 115         int                      sequence;
 116         struct timeval          *timer;
 117         double                   latency;
 118         uint32_t                 dropped;
 119         int                      recv_ttl;
 120         uint8_t                  recv_qos;
 121         char                    *data;
 122
 123         void                    *context;
 124
 125         struct pinghost         *next;
 126 };
 127
 128 struct pingobj
 129 {
 130         double                   timeout;
 131         int                      ttl;
 132         int                      addrfamily;
 133         uint8_t                  qos;
 134         char                    *data;
 135
 136         struct sockaddr         *srcaddr;
 137         socklen_t                srcaddrlen;
 138
 139         char                    *device;
 140
 141         char                     errmsg[PING_ERRMSG_LEN];
 142
 143         pinghost_t              *head;
 144 };
 145
 146 /*
 147  * private (static) functions
 148  */
 149 /* Even though Posix requires "strerror_r" to return an "int",
 150  * some systems (e.g. the GNU libc) return a "char *" _and_
 151  * ignore the second argument ... -tokkee */
 152 static char *sstrerror (int errnum, char *buf, size_t buflen)
 153 {
 154         buf[0] = 0;
 155
 156 #if !HAVE_STRERROR_R
 157         {
 158                 snprintf (buf, buflen, "Error %i (%#x)", errnum, errnum);
 159         }
 160 /* #endif !HAVE_STRERROR_R */
 161
 162 #elif STRERROR_R_CHAR_P
 163         {
 164                 char *temp;
 165                 temp = strerror_r (errnum, buf, buflen);
 166                 if (buf[0] == 0)
 167                 {
 168                         if ((temp != NULL) && (temp != buf) && (temp[0] != 0))
 169                                 strncpy (buf, temp, buflen);
 170                         else
 171                                 strncpy (buf, "strerror_r did not return "
 172                                                 "an error message", buflen);
 173                 }
 174         }
 175 /* #endif STRERROR_R_CHAR_P */
 176
 177 #else
 178         if (strerror_r (errnum, buf, buflen) != 0)
 179         {
 180                 snprintf (buf, buflen, "Error %i (%#x); "
 181                                 "Additionally, strerror_r failed.",
 182                                 errnum, errnum);
 183         }
 184 #endif /* STRERROR_R_CHAR_P */
 185
 186         buf[buflen - 1] = 0;
 187
 188         return (buf);
 189 } /* char *sstrerror */
 190
 191 static void ping_set_error (pingobj_t *obj, const char *function,
 192                 const char *message)
 193 {
 194         snprintf (obj->errmsg, sizeof (obj->errmsg),
 195                         "%s: %s", function, message);
 196         obj->errmsg[sizeof (obj->errmsg) - 1] = 0;
 197 }
 198
 199 static void ping_set_errno (pingobj_t *obj, int error_number)
 200 {
 201         sstrerror (error_number, obj->errmsg, sizeof (obj->errmsg));
 202 }
 203
 204 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
 205                 struct timeval *res)
 206 {
 207         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
 208         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
 209
 210         while (res->tv_usec > 1000000)
 211         {
 212                 res->tv_usec -= 1000000;
 213                 res->tv_sec++;
 214         }
 215
 216         return (0);
 217 }
 218
 219 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
 220                 struct timeval *res)
 221 {
 222         if ((tv1->tv_sec < tv2->tv_sec)
 223                         || ((tv1->tv_sec == tv2->tv_sec)
 224                                 && (tv1->tv_usec < tv2->tv_usec)))
 225                 return (-1);
 226
 227         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
 228         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
 229
 230         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec >= 0)));
 231
 232         while (res->tv_usec < 0)
 233         {
 234                 res->tv_usec += 1000000;
 235                 res->tv_sec--;
 236         }
 237
 238         return (0);
 239 }
 240
 241 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
 242 {
 243         uint32_t sum = 0;
 244         uint16_t ret = 0;
 245
 246         uint16_t *ptr;
 247
 248         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
 249                 sum += *ptr;
 250
 251         if (len == 1)
 252         {
 253                 *(char *) &ret = *(char *) ptr;
 254                 sum += ret;
 255         }
 256
 257         /* Do this twice to get all possible carries.. */
 258         sum = (sum >> 16) + (sum & 0xFFFF);
 259         sum = (sum >> 16) + (sum & 0xFFFF);
 260
 261         ret = ~sum;
 262
 263         return (ret);
 264 }
 265
 266 static pinghost_t *ping_receive_ipv4 (pingobj_t *obj, char *buffer,
 267                 size_t buffer_len)
 268 {
 269         struct ip *ip_hdr;
 270         struct icmp *icmp_hdr;
 271
 272         size_t ip_hdr_len;
 273
 274         uint16_t recv_checksum;
 275         uint16_t calc_checksum;
 276
 277         uint16_t ident;
 278         uint16_t seq;
 279
 280         pinghost_t *ptr;
 281
 282         if (buffer_len < sizeof (struct ip))
 283                 return (NULL);
 284
 285         ip_hdr     = (struct ip *) buffer;
 286         ip_hdr_len = ip_hdr->ip_hl << 2;
 287
 288         if (buffer_len < ip_hdr_len)
 289                 return (NULL);
 290
 291         buffer     += ip_hdr_len;
 292         buffer_len -= ip_hdr_len;
 293
 294         if (buffer_len < sizeof (struct icmp))
 295                 return (NULL);
 296
 297         icmp_hdr = (struct icmp *) buffer;
 298         buffer     += sizeof (struct icmp);
 299         buffer_len -= sizeof (struct icmp);
 300
 301         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
 302         {
 303                 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
 304                 return (NULL);
 305         }
 306
 307         recv_checksum = icmp_hdr->icmp_cksum;
 308         icmp_hdr->icmp_cksum = 0;
 309         calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
 310                         sizeof (struct icmp) + buffer_len);
 311
 312         if (recv_checksum != calc_checksum)
 313         {
 314                 dprintf ("Checksum missmatch: Got 0x%04"PRIx16", "
 315                                 "calculated 0x%04"PRIx16"\n",
 316                                 recv_checksum, calc_checksum);
 317                 return (NULL);
 318         }
 319
 320         ident = ntohs (icmp_hdr->icmp_id);
 321         seq   = ntohs (icmp_hdr->icmp_seq);
 322
 323         /* We have to iterate over all hosts, since ICMPv4 packets may
 324          * be received on any raw v4 socket. */
 325         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 326         {
 327                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 328                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 329
 330                 if (ptr->addrfamily != AF_INET)
 331                         continue;
 332
 333                 if (!timerisset (ptr->timer))
 334                         continue;
 335
 336                 if (ptr->ident != ident)
 337                         continue;
 338
 339                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 340                         continue;
 341
 342                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
 343                                 "seq = %"PRIu16"\n",
 344                                 ptr->hostname, ident, seq);
 345
 346                 break;
 347         }
 348
 349         if (ptr == NULL)
 350         {
 351                 dprintf ("No match found for ident = 0x%04"PRIx16", seq = %"PRIu16"\n",
 352                                 ident, seq);
 353         }
 354
 355         if (ptr != NULL){
 356                 ptr->recv_ttl = (int)     ip_hdr->ip_ttl;
 357                 ptr->recv_qos = (uint8_t) ip_hdr->ip_tos;
 358         }
 359         return (ptr);
 360 }
 361
 362 #ifndef ICMP6_ECHO_REQUEST
 363 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
 364 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
 365 # else
 366 #  define ICMP6_ECHO_REQUEST 128
 367 # endif
 368 #endif
 369
 370 #ifndef ICMP6_ECHO_REPLY
 371 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
 372 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
 373 # else
 374 #  define ICMP6_ECHO_REPLY 129
 375 # endif
 376 #endif
 377
 378 static pinghost_t *ping_receive_ipv6 (pingobj_t *obj, char *buffer,
 379                 size_t buffer_len)
 380 {
 381         struct icmp6_hdr *icmp_hdr;
 382
 383         uint16_t ident;
 384         uint16_t seq;
 385
 386         pinghost_t *ptr;
 387
 388         if (buffer_len < sizeof (struct icmp6_hdr))
 389                 return (NULL);
 390
 391         icmp_hdr = (struct icmp6_hdr *) buffer;
 392         buffer     += sizeof (struct icmp);
 393         buffer_len -= sizeof (struct icmp);
 394
 395         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 396         {
 397                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 398                 return (NULL);
 399         }
 400
 401         if (icmp_hdr->icmp6_code != 0)
 402         {
 403                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 404                 return (NULL);
 405         }
 406
 407         ident = ntohs (icmp_hdr->icmp6_id);
 408         seq   = ntohs (icmp_hdr->icmp6_seq);
 409
 410         /* We have to iterate over all hosts, since ICMPv6 packets may
 411          * be received on any raw v6 socket. */
 412         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 413         {
 414                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 415                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 416
 417                 if (ptr->addrfamily != AF_INET6)
 418                         continue;
 419
 420                 if (!timerisset (ptr->timer))
 421                         continue;
 422
 423                 if (ptr->ident != ident)
 424                         continue;
 425
 426                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 427                         continue;
 428
 429                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
 430                                 "seq = %"PRIu16"\n",
 431                                 ptr->hostname, ident, seq);
 432
 433                 break;
 434         }
 435
 436         if (ptr == NULL)
 437         {
 438                 dprintf ("No match found for ident = 0x%04"PRIx16", "
 439                                 "seq = %"PRIu16"\n",
 440                                 ident, seq);
 441         }
 442
 443         return (ptr);
 444 }
 445
 446 static int ping_receive_one (pingobj_t *obj, const pinghost_t *ph,
 447                 struct timeval *now)
 448 {
 449         /* Note: 'ph' is not necessarily the host object for which we receive a
 450          * reply. The right object will be returned by ping_receive_ipv*(). For
 451          * now, we can only rely on ph->fd and ph->addrfamily. */
 452
 453         struct timeval diff, pkt_now = *now;
 454         pinghost_t *host = NULL;
 455         int recv_ttl;
 456         uint8_t recv_qos;
 457
 458         /*
 459          * Set up the receive buffer..
 460          */
 461         struct msghdr msghdr;
 462         struct cmsghdr *cmsg;
 463         char payload_buffer[4096];
 464         ssize_t payload_buffer_len;
 465         char control_buffer[4096];
 466         struct iovec payload_iovec;
 467
 468         memset (&payload_iovec, 0, sizeof (payload_iovec));
 469         payload_iovec.iov_base = payload_buffer;
 470         payload_iovec.iov_len = sizeof (payload_buffer);
 471
 472         memset (&msghdr, 0, sizeof (msghdr));
 473         /* unspecified source address */
 474         msghdr.msg_name = NULL;
 475         msghdr.msg_namelen = 0;
 476         /* output buffer vector, see readv(2) */
 477         msghdr.msg_iov = &payload_iovec;
 478         msghdr.msg_iovlen = 1;
 479         /* output buffer for control messages */
 480         msghdr.msg_control = control_buffer;
 481         msghdr.msg_controllen = sizeof (control_buffer);
 482         /* flags; this is an output only field.. */
 483         msghdr.msg_flags = 0;
 484 #ifdef MSG_XPG4_2
 485         msghdr.msg_flags |= MSG_XPG4_2;
 486 #endif
 487
 488         payload_buffer_len = recvmsg (ph->fd, &msghdr, /* flags = */ 0);
 489         if (payload_buffer_len < 0)
 490         {
 491 #if WITH_DEBUG
 492                 char errbuf[PING_ERRMSG_LEN];
 493                 dprintf ("recvfrom: %s\n",
 494                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 495 #endif
 496                 return (-1);
 497         }
 498         dprintf ("Read %zi bytes from fd = %i\n", payload_buffer_len, ph->fd);
 499
 500         /* Iterate over all auxiliary data in msghdr */
 501         recv_ttl = -1;
 502         recv_qos = 0;
 503         for (cmsg = CMSG_FIRSTHDR (&msghdr); /* {{{ */
 504                         cmsg != NULL;
 505                         cmsg = CMSG_NXTHDR (&msghdr, cmsg))
 506         {
 507 #ifdef SO_TIMESTAMP
 508                 if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SO_TIMESTAMP)
 509                         memcpy(&pkt_now, CMSG_DATA(cmsg), sizeof(pkt_now));
 510 #endif /* SO_TIMESTAMP */
 511
 512                 if (ph->addrfamily == AF_INET) /* {{{ */
 513                 {
 514                         if (cmsg->cmsg_level != IPPROTO_IP)
 515                                 continue;
 516
 517                         if (cmsg->cmsg_type == IP_TOS)
 518                         {
 519                                 memcpy (&recv_qos, CMSG_DATA (cmsg),
 520                                                 sizeof (recv_qos));
 521                                 dprintf ("TOSv4 = 0x%02"PRIx8";\n", recv_qos);
 522                         } else
 523                         if (cmsg->cmsg_type == IP_TTL)
 524                         {
 525                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 526                                                 sizeof (recv_ttl));
 527                                 dprintf ("TTLv4 = %i;\n", recv_ttl);
 528                         }
 529                         else
 530                         {
 531                                 dprintf ("Not handling option %i.\n",
 532                                                 cmsg->cmsg_type);
 533                         }
 534                 } /* }}} */
 535                 else if (ph->addrfamily == AF_INET6) /* {{{ */
 536                 {
 537                         if (cmsg->cmsg_level != IPPROTO_IPV6)
 538                                 continue;
 539
 540                         if (cmsg->cmsg_type == IPV6_TCLASS)
 541                         {
 542                                 memcpy (&recv_qos, CMSG_DATA (cmsg),
 543                                                 sizeof (recv_qos));
 544                                 dprintf ("TOSv6 = 0x%02"PRIx8";\n", recv_qos);
 545                         } else
 546                         if (cmsg->cmsg_type == IPV6_HOPLIMIT)
 547                         {
 548                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 549                                                 sizeof (recv_ttl));
 550                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 551                         }
 552                         else
 553                         {
 554                                 dprintf ("Not handling option %i.\n",
 555                                                 cmsg->cmsg_type);
 556                         }
 557                 } /* }}} */
 558                 else
 559                 {
 560                         dprintf ("Don't know how to handle "
 561                                         "unknown protocol %i.\n",
 562                                         cmsg->cmsg_level);
 563                 }
 564         } /* }}} for (cmsg) */
 565
 566         if (ph->addrfamily == AF_INET)
 567         {
 568                 host = ping_receive_ipv4 (obj, payload_buffer, payload_buffer_len);
 569                 if (host == NULL)
 570                         return (-1);
 571         }
 572         else if (ph->addrfamily == AF_INET6)
 573         {
 574                 host = ping_receive_ipv6 (obj, payload_buffer, payload_buffer_len);
 575                 if (host == NULL)
 576                         return (-1);
 577         }
 578         else
 579         {
 580                 dprintf ("ping_receive_one: Unknown address family %i.\n",
 581                                 ph->addrfamily);
 582                 return (-1);
 583         }
 584
 585         dprintf ("rcvd: %12i.%06i\n",
 586                         (int) pkt_now.tv_sec,
 587                         (int) pkt_now.tv_usec);
 588         dprintf ("sent: %12i.%06i\n",
 589                         (int) host->timer->tv_sec,
 590                         (int) host->timer->tv_usec);
 591
 592         if (ping_timeval_sub (&pkt_now, host->timer, &diff) < 0)
 593         {
 594                 timerclear (host->timer);
 595                 return (-1);
 596         }
 597
 598         dprintf ("diff: %12i.%06i\n",
 599                         (int) diff.tv_sec,
 600                         (int) diff.tv_usec);
 601
 602         if (recv_ttl >= 0)
 603                 host->recv_ttl = recv_ttl;
 604         host->recv_qos = recv_qos;
 605
 606         host->latency  = ((double) diff.tv_usec) / 1000.0;
 607         host->latency += ((double) diff.tv_sec)  * 1000.0;
 608
 609         timerclear (host->timer);
 610
 611         return (0);
 612 }
 613
 614 static int ping_receive_all (pingobj_t *obj)
 615 {
 616         fd_set read_fds;
 617         fd_set err_fds;
 618         int num_fds;
 619         int max_fd;
 620
 621         pinghost_t *ph;
 622         pinghost_t *ptr;
 623
 624         struct timeval endtime;
 625         struct timeval nowtime;
 626         struct timeval timeout;
 627         int status;
 628
 629         int ret;
 630
 631         ph = obj->head;
 632         ret = 0;
 633
 634         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 635         {
 636                 ptr->latency  = -1.0;
 637                 ptr->recv_ttl = -1;
 638         }
 639
 640         if (gettimeofday (&nowtime, NULL) == -1)
 641         {
 642                 ping_set_errno (obj, errno);
 643                 return (-1);
 644         }
 645
 646         /* Set up timeout */
 647         timeout.tv_sec = (time_t) obj->timeout;
 648         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 649
 650         dprintf ("Set timeout to %i.%06i seconds\n",
 651                         (int) timeout.tv_sec,
 652                         (int) timeout.tv_usec);
 653
 654         ping_timeval_add (&nowtime, &timeout, &endtime);
 655
 656         while (1)
 657         {
 658                 FD_ZERO (&read_fds);
 659                 FD_ZERO (&err_fds);
 660                 num_fds =  0;
 661                 max_fd = -1;
 662
 663                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 664                 {
 665                         if (!timerisset (ptr->timer))
 666                                 continue;
 667
 668                         FD_SET (ptr->fd, &read_fds);
 669                         FD_SET (ptr->fd, &err_fds);
 670                         num_fds++;
 671
 672                         if (max_fd < ptr->fd)
 673                                 max_fd = ptr->fd;
 674                 }
 675
 676                 if (num_fds == 0)
 677                         break;
 678
 679                 if (gettimeofday (&nowtime, NULL) == -1)
 680                 {
 681                         ping_set_errno (obj, errno);
 682                         return (-1);
 683                 }
 684
 685                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 686                         break;
 687
 688                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_fds,
 689                                 (int) timeout.tv_sec,
 690                                 (int) timeout.tv_usec);
 691
 692                 status = select (max_fd + 1, &read_fds, NULL, &err_fds, &timeout);
 693
 694                 if (gettimeofday (&nowtime, NULL) == -1)
 695                 {
 696                         ping_set_errno (obj, errno);
 697                         return (-1);
 698                 }
 699
 700                 if ((status == -1) && (errno == EINTR))
 701                 {
 702                         dprintf ("select was interrupted by signal..\n");
 703                         continue;
 704                 }
 705                 else if (status < 0)
 706                 {
 707 #if WITH_DEBUG
 708                         char errbuf[PING_ERRMSG_LEN];
 709                         dprintf ("select: %s\n",
 710                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 711 #endif
 712                         break;
 713                 }
 714                 else if (status == 0)
 715                 {
 716                         dprintf ("select timed out\n");
 717                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 718                                 if (ptr->latency < 0.0)
 719                                         ptr->dropped++;
 720                         break;
 721                 }
 722
 723                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 724                 {
 725                         if (FD_ISSET (ptr->fd, &read_fds))
 726                         {
 727                                 if (ping_receive_one (obj, ptr, &nowtime) == 0)
 728                                         ret++;
 729                         }
 730                         else if (FD_ISSET (ptr->fd, &err_fds))
 731                         {
 732                                 /* clear the timer in this case so that we
 733                                  * don't run into an endless loop. */
 734                                 /* TODO: Set an error flag in this case. */
 735                                 timerclear (ptr->timer);
 736                         }
 737                 }
 738         } /* while (1) */
 739
 740         return (ret);
 741 }
 742
 743 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 744  * Sending functions:                                                        *
 745  *                                                                           *
 746  * ping_send_all                                                             *
 747  * +-> ping_send_one_ipv4                                                    *
 748  * `-> ping_send_one_ipv6                                                    *
 749  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 750 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 751                 const void *buf, size_t buflen)
 752 {
 753         ssize_t ret;
 754
 755         if (gettimeofday (ph->timer, NULL) == -1)
 756         {
 757                 timerclear (ph->timer);
 758                 return (-1);
 759         }
 760
 761         ret = sendto (ph->fd, buf, buflen, 0,
 762                         (struct sockaddr *) ph->addr, ph->addrlen);
 763
 764         if (ret < 0)
 765         {
 766 #if defined(EHOSTUNREACH)
 767                 if (errno == EHOSTUNREACH)
 768                         return (0);
 769 #endif
 770 #if defined(ENETUNREACH)
 771                 if (errno == ENETUNREACH)
 772                         return (0);
 773 #endif
 774                 ping_set_errno (obj, errno);
 775         }
 776
 777         return (ret);
 778 }
 779
 780 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 781 {
 782         struct icmp *icmp4;
 783         int status;
 784
 785         char buf[4096];
 786         int  buflen;
 787
 788         char *data;
 789         int   datalen;
 790
 791         dprintf ("ph->hostname = %s\n", ph->hostname);
 792
 793         memset (buf, '\0', sizeof (buf));
 794         icmp4 = (struct icmp *) buf;
 795         data  = (char *) (icmp4 + 1);
 796
 797         icmp4->icmp_type  = ICMP_ECHO;
 798         icmp4->icmp_code  = 0;
 799         icmp4->icmp_cksum = 0;
 800         icmp4->icmp_id    = htons (ph->ident);
 801         icmp4->icmp_seq   = htons (ph->sequence);
 802
 803         buflen = 4096 - sizeof (struct icmp);
 804         strncpy (data, ph->data, buflen);
 805         datalen = strlen (data);
 806
 807         buflen = datalen + sizeof (struct icmp);
 808
 809         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 810
 811         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 812
 813         status = ping_sendto (obj, ph, buf, buflen);
 814         if (status < 0)
 815         {
 816                 perror ("ping_sendto");
 817                 return (-1);
 818         }
 819
 820         dprintf ("sendto: status = %i\n", status);
 821
 822         return (0);
 823 }
 824
 825 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 826 {
 827         struct icmp6_hdr *icmp6;
 828         int status;
 829
 830         char buf[4096];
 831         int  buflen;
 832
 833         char *data;
 834         int   datalen;
 835
 836         dprintf ("ph->hostname = %s\n", ph->hostname);
 837
 838         memset (buf, '\0', sizeof (buf));
 839         icmp6 = (struct icmp6_hdr *) buf;
 840         data  = (char *) (icmp6 + 1);
 841
 842         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 843         icmp6->icmp6_code  = 0;
 844         /* The checksum will be calculated by the TCP/IP stack.  */
 845         /* FIXME */
 846         icmp6->icmp6_cksum = 0;
 847         icmp6->icmp6_id    = htons (ph->ident);
 848         icmp6->icmp6_seq   = htons (ph->sequence);
 849
 850         buflen = 4096 - sizeof (struct icmp6_hdr);
 851         strncpy (data, ph->data, buflen);
 852         datalen = strlen (data);
 853
 854         buflen = datalen + sizeof (struct icmp6_hdr);
 855
 856         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 857
 858         status = ping_sendto (obj, ph, buf, buflen);
 859         if (status < 0)
 860         {
 861                 perror ("ping_sendto");
 862                 return (-1);
 863         }
 864
 865         dprintf ("sendto: status = %i\n", status);
 866
 867         return (0);
 868 }
 869
 870 static int ping_send_all (pingobj_t *obj)
 871 {
 872         pinghost_t *ph;
 873         pinghost_t *ptr;
 874
 875         int ret;
 876
 877         ret = 0;
 878         ph = obj->head;
 879
 880         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 881         {
 882                 /* start timer.. The GNU `ping6' starts the timer before
 883                  * sending the packet, so I will do that too */
 884                 if (gettimeofday (ptr->timer, NULL) == -1)
 885                 {
 886 #if WITH_DEBUG
 887                         char errbuf[PING_ERRMSG_LEN];
 888                         dprintf ("gettimeofday: %s\n",
 889                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 890 #endif
 891                         timerclear (ptr->timer);
 892                         ret--;
 893                         continue;
 894                 }
 895                 else
 896                 {
 897                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 898                 }
 899
 900                 if (ptr->addrfamily == AF_INET6)
 901                 {
 902                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 903                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 904                         {
 905                                 timerclear (ptr->timer);
 906                                 ret--;
 907                                 continue;
 908                         }
 909                 }
 910                 else if (ptr->addrfamily == AF_INET)
 911                 {
 912                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 913                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 914                         {
 915                                 timerclear (ptr->timer);
 916                                 ret--;
 917                                 continue;
 918                         }
 919                 }
 920                 else /* this should not happen */
 921                 {
 922                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 923                         timerclear (ptr->timer);
 924                         ret--;
 925                         continue;
 926                 }
 927
 928                 ptr->sequence++;
 929         }
 930
 931         return (ret);
 932 }
 933
 934 /*
 935  * Set the TTL of a socket protocol independently.
 936  */
 937 static int ping_set_ttl (pinghost_t *ph, int ttl)
 938 {
 939         int ret = -2;
 940
 941         if (ph->addrfamily == AF_INET)
 942         {
 943                 dprintf ("Setting TTLv4 to %i\n", ttl);
 944                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL,
 945                                 &ttl, sizeof (ttl));
 946         }
 947         else if (ph->addrfamily == AF_INET6)
 948         {
 949                 dprintf ("Setting TTLv6 to %i\n", ttl);
 950                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
 951                                 &ttl, sizeof (ttl));
 952         }
 953
 954         return (ret);
 955 }
 956
 957 /*
 958  * Set the TOS of a socket protocol independently.
 959  *
 960  * Using SOL_SOCKET / SO_PRIORITY might be a protocol independent way to
 961  * set this. See socket(7) for details.
 962  */
 963 static int ping_set_qos (pingobj_t *obj, pinghost_t *ph, uint8_t qos)
 964 {
 965         int ret = EINVAL;
 966         char errbuf[PING_ERRMSG_LEN];
 967
 968         if (ph->addrfamily == AF_INET)
 969         {
 970                 dprintf ("Setting TP_TOS to %#04"PRIx8"\n", qos);
 971                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TOS,
 972                                 &qos, sizeof (qos));
 973                 if (ret != 0)
 974                 {
 975                         ret = errno;
 976                         ping_set_error (obj, "ping_set_qos",
 977                                         sstrerror (ret, errbuf, sizeof (errbuf)));
 978                         dprintf ("Setting TP_TOS failed: %s\n", errbuf);
 979                 }
 980         }
 981         else if (ph->addrfamily == AF_INET6)
 982         {
 983                 /* IPV6_TCLASS requires an "int". */
 984                 int tmp = (int) qos;
 985
 986                 dprintf ("Setting IPV6_TCLASS to %#04"PRIx8" (%i)\n", qos, tmp);
 987                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_TCLASS,
 988                                 &tmp, sizeof (tmp));
 989                 if (ret != 0)
 990                 {
 991                         ret = errno;
 992                         ping_set_error (obj, "ping_set_qos",
 993                                         sstrerror (ret, errbuf, sizeof (errbuf)));
 994                         dprintf ("Setting IPV6_TCLASS failed: %s\n", errbuf);
 995                 }
 996         }
 997
 998         return (ret);
 999 }
1000
1001 static int ping_get_ident (void)
1002 {
1003         int fd;
1004         static int did_seed = 0;
1005
1006         int retval;
1007
1008         if (did_seed == 0)
1009         {
1010                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
1011                 {
1012                         unsigned int seed;
1013
1014                         if (read (fd, &seed, sizeof (seed)) != -1)
1015                         {
1016                                 did_seed = 1;
1017                                 dprintf ("Random seed:   %#x\n", seed);
1018                                 srandom (seed);
1019                         }
1020
1021                         close (fd);
1022                 }
1023 #if WITH_DEBUG
1024                 else
1025                 {
1026                         char errbuf[PING_ERRMSG_LEN];
1027                         dprintf ("open (/dev/urandom): %s\n",
1028                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1029                 }
1030 #endif
1031         }
1032
1033         retval = (int) random ();
1034
1035         dprintf ("Random number: %#x\n", retval);
1036
1037         return (retval);
1038 }
1039
1040 static pinghost_t *ping_alloc (void)
1041 {
1042         pinghost_t *ph;
1043         size_t      ph_size;
1044
1045         ph_size = sizeof (pinghost_t)
1046                 + sizeof (struct sockaddr_storage)
1047                 + sizeof (struct timeval);
1048
1049         ph = (pinghost_t *) malloc (ph_size);
1050         if (ph == NULL)
1051                 return (NULL);
1052
1053         memset (ph, '\0', ph_size);
1054
1055         ph->timer   = (struct timeval *) (ph + 1);
1056         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
1057
1058         ph->addrlen = sizeof (struct sockaddr_storage);
1059         ph->fd      = -1;
1060         ph->latency = -1.0;
1061         ph->dropped = 0;
1062         ph->ident   = ping_get_ident () & 0xFFFF;
1063
1064         return (ph);
1065 }
1066
1067 static void ping_free (pinghost_t *ph)
1068 {
1069         if (ph->fd >= 0)
1070                 close (ph->fd);
1071
1072         if (ph->username != NULL)
1073                 free (ph->username);
1074
1075         if (ph->hostname != NULL)
1076                 free (ph->hostname);
1077
1078         if (ph->data != NULL)
1079                 free (ph->data);
1080
1081         free (ph);
1082 }
1083
1084 /*
1085  * public methods
1086  */
1087 const char *ping_get_error (pingobj_t *obj)
1088 {
1089         if (obj == NULL)
1090                 return (NULL);
1091         return (obj->errmsg);
1092 }
1093
1094 pingobj_t *ping_construct (void)
1095 {
1096         pingobj_t *obj;
1097
1098         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
1099                 return (NULL);
1100         memset (obj, 0, sizeof (pingobj_t));
1101
1102         obj->timeout    = PING_DEF_TIMEOUT;
1103         obj->ttl        = PING_DEF_TTL;
1104         obj->addrfamily = PING_DEF_AF;
1105         obj->data       = strdup (PING_DEF_DATA);
1106         obj->qos        = 0;
1107
1108         return (obj);
1109 }
1110
1111 void ping_destroy (pingobj_t *obj)
1112 {
1113         pinghost_t *current;
1114         pinghost_t *next;
1115
1116         if (obj == NULL)
1117                 return;
1118
1119         current = obj->head;
1120         next = NULL;
1121
1122         while (current != NULL)
1123         {
1124                 next = current->next;
1125                 ping_free (current);
1126                 current = next;
1127         }
1128
1129         if (obj->data != NULL)
1130                 free (obj->data);
1131
1132         if (obj->srcaddr != NULL)
1133                 free (obj->srcaddr);
1134
1135         if (obj->device != NULL)
1136                 free (obj->device);
1137
1138         free (obj);
1139
1140         return;
1141 }
1142
1143 int ping_setopt (pingobj_t *obj, int option, void *value)
1144 {
1145         int ret = 0;
1146
1147         if ((obj == NULL) || (value == NULL))
1148                 return (-1);
1149
1150         switch (option)
1151         {
1152                 case PING_OPT_QOS:
1153                 {
1154                         pinghost_t *ph;
1155
1156                         obj->qos = *((uint8_t *) value);
1157                         for (ph = obj->head; ph != NULL; ph = ph->next)
1158                                 ping_set_qos (obj, ph, obj->qos);
1159                         break;
1160                 }
1161
1162                 case PING_OPT_TIMEOUT:
1163                         obj->timeout = *((double *) value);
1164                         if (obj->timeout < 0.0)
1165                         {
1166                                 obj->timeout = PING_DEF_TIMEOUT;
1167                                 ret = -1;
1168                         }
1169                         break;
1170
1171                 case PING_OPT_TTL:
1172                         obj->ttl = *((int *) value);
1173                         if ((obj->ttl < 1) || (obj->ttl > 255))
1174                         {
1175                                 obj->ttl = PING_DEF_TTL;
1176                                 ret = -1;
1177                         }
1178                         else
1179                         {
1180                                 pinghost_t *ph;
1181
1182                                 for (ph = obj->head; ph != NULL; ph = ph->next)
1183                                         ping_set_ttl (ph, obj->ttl);
1184                         }
1185                         break;
1186
1187                 case PING_OPT_AF:
1188                         obj->addrfamily = *((int *) value);
1189                         if ((obj->addrfamily != AF_UNSPEC)
1190                                         && (obj->addrfamily != AF_INET)
1191                                         && (obj->addrfamily != AF_INET6))
1192                         {
1193                                 obj->addrfamily = PING_DEF_AF;
1194                                 ret = -1;
1195                         }
1196                         if (obj->srcaddr != NULL)
1197                         {
1198                                 free (obj->srcaddr);
1199                                 obj->srcaddr = NULL;
1200                         }
1201                         break;
1202
1203                 case PING_OPT_DATA:
1204                         if (obj->data != NULL)
1205                         {
1206                                 free (obj->data);
1207                                 obj->data = NULL;
1208                         }
1209                         obj->data = strdup ((const char *) value);
1210                         break;
1211
1212                 case PING_OPT_SOURCE:
1213                 {
1214                         char            *hostname = (char *) value;
1215                         struct addrinfo  ai_hints;
1216                         struct addrinfo *ai_list;
1217                         int              status;
1218 #if WITH_DEBUG
1219                         if (obj->addrfamily != AF_UNSPEC)
1220                         {
1221                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1222                         }
1223 #endif
1224                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1225                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1226 #if defined(AI_ADDRCONFIG)
1227                         ai_hints.ai_flags = AI_ADDRCONFIG;
1228 #endif
1229                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1230                         if (status != 0)
1231                         {
1232 #if defined(EAI_SYSTEM)
1233                                 char errbuf[PING_ERRMSG_LEN];
1234 #endif
1235                                 ping_set_error (obj, "getaddrinfo",
1236 #if defined(EAI_SYSTEM)
1237                                                 (status == EAI_SYSTEM)
1238                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1239 #endif
1240                                                 gai_strerror (status));
1241                                 ret = -1;
1242                                 break;
1243                         }
1244 #if WITH_DEBUG
1245                         if (ai_list->ai_next != NULL)
1246                         {
1247                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1248                         }
1249 #endif
1250                         if (obj->srcaddr == NULL)
1251                         {
1252                                 obj->srcaddrlen = 0;
1253                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1254                                 if (obj->srcaddr == NULL)
1255                                 {
1256                                         ping_set_errno (obj, errno);
1257                                         ret = -1;
1258                                         freeaddrinfo (ai_list);
1259                                         break;
1260                                 }
1261                         }
1262                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1263                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1264                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1265                                         ai_list->ai_addrlen);
1266                         obj->srcaddrlen = ai_list->ai_addrlen;
1267                         obj->addrfamily = ai_list->ai_family;
1268
1269                         freeaddrinfo (ai_list);
1270                 } /* case PING_OPT_SOURCE */
1271                 break;
1272
1273                 case PING_OPT_DEVICE:
1274                 {
1275 #ifdef SO_BINDTODEVICE
1276                         char *device = strdup ((char *) value);
1277
1278                         if (device == NULL)
1279                         {
1280                                 ping_set_errno (obj, errno);
1281                                 ret = -1;
1282                                 break;
1283                         }
1284
1285                         if (obj->device != NULL)
1286                                 free (obj->device);
1287                         obj->device = device;
1288 #else /* ! SO_BINDTODEVICE */
1289                         ping_set_errno (obj, ENOTSUP);
1290                         ret = -1;
1291 #endif /* ! SO_BINDTODEVICE */
1292                 } /* case PING_OPT_DEVICE */
1293                 break;
1294
1295                 default:
1296                         ret = -2;
1297         } /* switch (option) */
1298
1299         return (ret);
1300 } /* int ping_setopt */
1301
1302
1303 int ping_send (pingobj_t *obj)
1304 {
1305         int ret;
1306
1307         if (obj == NULL)
1308                 return (-1);
1309
1310         if (ping_send_all (obj) < 0)
1311                 return (-1);
1312
1313         if ((ret = ping_receive_all (obj)) < 0)
1314                 return (-2);
1315
1316         return (ret);
1317 }
1318
1319 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1320 {
1321         while (ph != NULL)
1322         {
1323                 if (strcasecmp (ph->username, host) == 0)
1324                         break;
1325
1326                 ph = ph->next;
1327         }
1328
1329         return (ph);
1330 }
1331
1332 int ping_host_add (pingobj_t *obj, const char *host)
1333 {
1334         pinghost_t *ph;
1335
1336         struct addrinfo  ai_hints;
1337         struct addrinfo *ai_list, *ai_ptr;
1338         int              ai_return;
1339
1340         if ((obj == NULL) || (host == NULL))
1341                 return (-1);
1342
1343         dprintf ("host = %s\n", host);
1344
1345         if (ping_host_search (obj->head, host) != NULL)
1346                 return (0);
1347
1348         memset (&ai_hints, '\0', sizeof (ai_hints));
1349         ai_hints.ai_flags     = 0;
1350 #ifdef AI_ADDRCONFIG
1351         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1352 #endif
1353 #ifdef AI_CANONNAME
1354         ai_hints.ai_flags    |= AI_CANONNAME;
1355 #endif
1356         ai_hints.ai_family    = obj->addrfamily;
1357         ai_hints.ai_socktype  = SOCK_RAW;
1358
1359         if ((ph = ping_alloc ()) == NULL)
1360         {
1361                 dprintf ("Out of memory!\n");
1362                 return (-1);
1363         }
1364
1365         if ((ph->username = strdup (host)) == NULL)
1366         {
1367                 dprintf ("Out of memory!\n");
1368                 ping_set_errno (obj, errno);
1369                 ping_free (ph);
1370                 return (-1);
1371         }
1372
1373         if ((ph->hostname = strdup (host)) == NULL)
1374         {
1375                 dprintf ("Out of memory!\n");
1376                 ping_set_errno (obj, errno);
1377                 ping_free (ph);
1378                 return (-1);
1379         }
1380
1381         /* obj->data is not garuanteed to be != NULL */
1382         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1383         {
1384                 dprintf ("Out of memory!\n");
1385                 ping_set_errno (obj, errno);
1386                 ping_free (ph);
1387                 return (-1);
1388         }
1389
1390         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1391         {
1392 #if defined(EAI_SYSTEM)
1393                 char errbuf[PING_ERRMSG_LEN];
1394 #endif
1395                 dprintf ("getaddrinfo failed\n");
1396                 ping_set_error (obj, "getaddrinfo",
1397 #if defined(EAI_SYSTEM)
1398                                                 (ai_return == EAI_SYSTEM)
1399                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1400 #endif
1401                                 gai_strerror (ai_return));
1402                 ping_free (ph);
1403                 return (-1);
1404         }
1405
1406         if (ai_list == NULL)
1407                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1408
1409         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1410         {
1411                 ph->fd = -1;
1412
1413                 if (ai_ptr->ai_family == AF_INET)
1414                 {
1415                         ai_ptr->ai_socktype = SOCK_RAW;
1416                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1417                 }
1418                 else if (ai_ptr->ai_family == AF_INET6)
1419                 {
1420                         ai_ptr->ai_socktype = SOCK_RAW;
1421                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1422                 }
1423                 else
1424                 {
1425                         char errmsg[PING_ERRMSG_LEN];
1426
1427                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1428                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1429
1430                         dprintf (errmsg);
1431                         ping_set_error (obj, "getaddrinfo", errmsg);
1432                         continue;
1433                 }
1434
1435                 /* TODO: Move this to a static function `ping_open_socket' and
1436                  * call it whenever the socket dies. */
1437                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1438                 if (ph->fd == -1)
1439                 {
1440 #if WITH_DEBUG
1441                         char errbuf[PING_ERRMSG_LEN];
1442                         dprintf ("socket: %s\n",
1443                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1444 #endif
1445                         ping_set_errno (obj, errno);
1446                         continue;
1447                 }
1448
1449                 if (obj->srcaddr != NULL)
1450                 {
1451                         assert (obj->srcaddrlen > 0);
1452                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1453
1454                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1455                         {
1456 #if WITH_DEBUG
1457                                 char errbuf[PING_ERRMSG_LEN];
1458                                 dprintf ("bind: %s\n",
1459                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1460 #endif
1461                                 ping_set_errno (obj, errno);
1462                                 close (ph->fd);
1463                                 ph->fd = -1;
1464                                 continue;
1465                         }
1466                 }
1467
1468 #ifdef SO_BINDTODEVICE
1469                 if (obj->device != NULL)
1470                 {
1471                         if (setsockopt (ph->fd, SOL_SOCKET, SO_BINDTODEVICE,
1472                                         obj->device, strlen (obj->device) + 1) != 0)
1473                         {
1474 #if WITH_DEBUG
1475                                 char errbuf[PING_ERRMSG_LEN];
1476                                 dprintf ("setsockopt: %s\n",
1477                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1478 #endif
1479                                 ping_set_errno (obj, errno);
1480                                 close (ph->fd);
1481                                 ph->fd = -1;
1482                                 continue;
1483                         }
1484                 }
1485 #endif /* SO_BINDTODEVICE */
1486 #ifdef SO_TIMESTAMP
1487                 if (1)
1488                 {
1489                         int c = 1;
1490                         setsockopt(ph->fd, SOL_SOCKET, SO_TIMESTAMP, &c, sizeof(c));
1491                 }
1492 #endif /* SO_TIMESTAMP */
1493                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1494                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1495                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1496                 ph->addrlen = ai_ptr->ai_addrlen;
1497                 ph->addrfamily = ai_ptr->ai_family;
1498
1499 #ifdef AI_CANONNAME
1500                 if ((ai_ptr->ai_canonname != NULL)
1501                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1502                 {
1503                         char *old_hostname;
1504
1505                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1506                                         ph->hostname, ai_ptr->ai_canonname);
1507
1508                         old_hostname = ph->hostname;
1509                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1510                         {
1511                                 /* strdup failed, falling back to old hostname */
1512                                 ph->hostname = old_hostname;
1513                         }
1514                         else if (old_hostname != NULL)
1515                         {
1516                                 free (old_hostname);
1517                         }
1518                 }
1519 #endif /* AI_CANONNAME */
1520
1521                 if (ph->addrfamily == AF_INET)
1522                 {
1523                         int opt;
1524
1525                         /* Enable receiving the TOS field */
1526                         opt = 1;
1527                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTOS,
1528                                         &opt, sizeof (opt));
1529
1530                         /* Enable receiving the TTL field */
1531                         opt = 1;
1532                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1533                                         &opt, sizeof (opt));
1534                 }
1535 #if defined(IPV6_RECVHOPLIMIT) || defined(IPV6_RECVTCLASS)
1536                 else if (ph->addrfamily == AF_INET6)
1537                 {
1538                         int opt;
1539
1540 # if defined(IPV6_RECVHOPLIMIT)
1541                         /* For details see RFC 3542, section 6.3. */
1542                         opt = 1;
1543                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1544                                         &opt, sizeof (opt));
1545 # endif /* IPV6_RECVHOPLIMIT */
1546
1547 # if defined(IPV6_RECVTCLASS)
1548                         /* For details see RFC 3542, section 6.5. */
1549                         opt = 1;
1550                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVTCLASS,
1551                                         &opt, sizeof (opt));
1552 # endif /* IPV6_RECVTCLASS */
1553                 }
1554 #endif /* IPV6_RECVHOPLIMIT || IPV6_RECVTCLASS */
1555
1556                 break;
1557         } /* for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next) */
1558
1559         freeaddrinfo (ai_list);
1560
1561         if (ph->fd < 0)
1562         {
1563                 ping_free (ph);
1564                 return (-1);
1565         }
1566
1567         /*
1568          * Adding in the front is much easier, but then the iterator will
1569          * return the host that was added last as first host. That's just not
1570          * nice. -octo
1571          */
1572         if (obj->head == NULL)
1573         {
1574                 obj->head = ph;
1575         }
1576         else
1577         {
1578                 pinghost_t *hptr;
1579
1580                 hptr = obj->head;
1581                 while (hptr->next != NULL)
1582                         hptr = hptr->next;
1583
1584                 assert ((hptr != NULL) && (hptr->next == NULL));
1585                 hptr->next = ph;
1586         }
1587
1588         ping_set_ttl (ph, obj->ttl);
1589         ping_set_qos (obj, ph, obj->qos);
1590
1591         return (0);
1592 } /* int ping_host_add */
1593
1594 int ping_host_remove (pingobj_t *obj, const char *host)
1595 {
1596         pinghost_t *pre, *cur;
1597
1598         if ((obj == NULL) || (host == NULL))
1599                 return (-1);
1600
1601         pre = NULL;
1602         cur = obj->head;
1603
1604         while (cur != NULL)
1605         {
1606                 if (strcasecmp (host, cur->username) == 0)
1607                         break;
1608
1609                 pre = cur;
1610                 cur = cur->next;
1611         }
1612
1613         if (cur == NULL)
1614         {
1615                 ping_set_error (obj, "ping_host_remove", "Host not found");
1616                 return (-1);
1617         }
1618
1619         if (pre == NULL)
1620                 obj->head = cur->next;
1621         else
1622                 pre->next = cur->next;
1623
1624         ping_free (cur);
1625
1626         return (0);
1627 }
1628
1629 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1630 {
1631         if (obj == NULL)
1632                 return (NULL);
1633         return ((pingobj_iter_t *) obj->head);
1634 }
1635
1636 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1637 {
1638         if (iter == NULL)
1639                 return (NULL);
1640         return ((pingobj_iter_t *) iter->next);
1641 }
1642
1643 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1644                 void *buffer, size_t *buffer_len)
1645 {
1646         int ret = EINVAL;
1647
1648         size_t orig_buffer_len = *buffer_len;
1649
1650         if ((iter == NULL) || (buffer_len == NULL))
1651                 return (-1);
1652
1653         if ((buffer == NULL) && (*buffer_len != 0 ))
1654                 return (-1);
1655
1656         switch (info)
1657         {
1658                 case PING_INFO_USERNAME:
1659                         ret = ENOMEM;
1660                         *buffer_len = strlen (iter->username) + 1;
1661                         if (orig_buffer_len <= *buffer_len)
1662                                 break;
1663                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1664                          * will copy `*buffer_len' and pad the rest of
1665                          * `buffer' with null-bytes */
1666                         strncpy (buffer, iter->username, orig_buffer_len);
1667                         ret = 0;
1668                         break;
1669
1670                 case PING_INFO_HOSTNAME:
1671                         ret = ENOMEM;
1672                         *buffer_len = strlen (iter->hostname) + 1;
1673                         if (orig_buffer_len < *buffer_len)
1674                                 break;
1675                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1676                          * will copy `*buffer_len' and pad the rest of
1677                          * `buffer' with null-bytes */
1678                         strncpy (buffer, iter->hostname, orig_buffer_len);
1679                         ret = 0;
1680                         break;
1681
1682                 case PING_INFO_ADDRESS:
1683                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1684                                         iter->addrlen,
1685                                         (char *) buffer,
1686                                         *buffer_len,
1687                                         NULL, 0,
1688                                         NI_NUMERICHOST);
1689                         if (ret != 0)
1690                         {
1691                                 if ((ret == EAI_MEMORY)
1692 #ifdef EAI_OVERFLOW
1693                                                 || (ret == EAI_OVERFLOW)
1694 #endif
1695                                    )
1696                                         ret = ENOMEM;
1697 #if defined(EAI_SYSTEM)
1698                                 else if (ret == EAI_SYSTEM)
1699                                         ret = errno;
1700 #endif
1701                                 else
1702                                         ret = EINVAL;
1703                         }
1704                         break;
1705
1706                 case PING_INFO_FAMILY:
1707                         ret = ENOMEM;
1708                         *buffer_len = sizeof (int);
1709                         if (orig_buffer_len < sizeof (int))
1710                                 break;
1711                         *((int *) buffer) = iter->addrfamily;
1712                         ret = 0;
1713                         break;
1714
1715                 case PING_INFO_LATENCY:
1716                         ret = ENOMEM;
1717                         *buffer_len = sizeof (double);
1718                         if (orig_buffer_len < sizeof (double))
1719                                 break;
1720                         *((double *) buffer) = iter->latency;
1721                         ret = 0;
1722                         break;
1723
1724                 case PING_INFO_DROPPED:
1725                         ret = ENOMEM;
1726                         *buffer_len = sizeof (uint32_t);
1727                         if (orig_buffer_len < sizeof (uint32_t))
1728                                 break;
1729                         *((uint32_t *) buffer) = iter->dropped;
1730                         ret = 0;
1731                         break;
1732
1733                 case PING_INFO_SEQUENCE:
1734                         ret = ENOMEM;
1735                         *buffer_len = sizeof (unsigned int);
1736                         if (orig_buffer_len < sizeof (unsigned int))
1737                                 break;
1738                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1739                         ret = 0;
1740                         break;
1741
1742                 case PING_INFO_IDENT:
1743                         ret = ENOMEM;
1744                         *buffer_len = sizeof (uint16_t);
1745                         if (orig_buffer_len < sizeof (uint16_t))
1746                                 break;
1747                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1748                         ret = 0;
1749                         break;
1750
1751                 case PING_INFO_DATA:
1752                         ret = ENOMEM;
1753                         *buffer_len = strlen (iter->data);
1754                         if (orig_buffer_len < *buffer_len)
1755                                 break;
1756                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1757                         ret = 0;
1758                         break;
1759
1760                 case PING_INFO_RECV_TTL:
1761                         ret = ENOMEM;
1762                         *buffer_len = sizeof (int);
1763                         if (orig_buffer_len < sizeof (int))
1764                                 break;
1765                         *((int *) buffer) = iter->recv_ttl;
1766                         ret = 0;
1767                         break;
1768
1769                 case PING_INFO_RECV_QOS:
1770                         ret = ENOMEM;
1771                         if (*buffer_len>sizeof(unsigned)) *buffer_len=sizeof(unsigned);
1772                         if (!*buffer_len) *buffer_len=1;
1773                         if (orig_buffer_len < *buffer_len)
1774                                 break;
1775                         memcpy(buffer,&iter->recv_qos,*buffer_len);
1776                         ret = 0;
1777                         break;
1778         }
1779
1780         return (ret);
1781 } /* ping_iterator_get_info */
1782
1783 void *ping_iterator_get_context (pingobj_iter_t *iter)
1784 {
1785         if (iter == NULL)
1786                 return (NULL);
1787         return (iter->context);
1788 }
1789
1790 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1791 {
1792         if (iter == NULL)
1793                 return;
1794         iter->context = context;
1795 }