src/liboping.c

   1 /**
   2  * Object oriented C module to send ICMP and ICMPv6 `echo's.
   3  * Copyright (C) 2006-2011  Florian octo Forster <ff at octo.it>
   4  *
   5  * This library is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU Lesser General Public License as published by the
   7  * Free Software Foundation; either version 2.1 of the License, or (at your
   8  * option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
  13  * for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public License
  16  * along with this library; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19
  20 #ifdef __APPLE__
  21 #define __APPLE_USE_RFC_3542
  22 #endif
  23
  24 #if HAVE_CONFIG_H
  25 # include <config.h>
  26 #endif
  27
  28 #if STDC_HEADERS
  29 # include <stdlib.h>
  30 # include <stdio.h>
  31 # include <string.h>
  32 # include <inttypes.h>
  33 # include <errno.h>
  34 # include <assert.h>
  35 #else
  36 # error "You don't have the standard C99 header files installed"
  37 #endif /* STDC_HEADERS */
  38
  39 #ifdef HAVE_STDINT_H
  40 # include <stdint.h>
  41 #endif
  42
  43 #if HAVE_UNISTD_H
  44 # include <unistd.h>
  45 #endif
  46
  47 #if HAVE_FCNTL_H
  48 # include <fcntl.h>
  49 #endif
  50 #if HAVE_SYS_TYPES_H
  51 # include <sys/types.h>
  52 #endif
  53 #if HAVE_SYS_STAT_H
  54 # include <sys/stat.h>
  55 #endif
  56
  57 #if TIME_WITH_SYS_TIME
  58 # include <sys/time.h>
  59 # include <time.h>
  60 #else
  61 # if HAVE_SYS_TIME_H
  62 #  include <sys/time.h>
  63 # else
  64 #  include <time.h>
  65 # endif
  66 #endif
  67
  68 #if HAVE_SYS_SOCKET_H
  69 # include <sys/socket.h>
  70 #endif
  71
  72 #if HAVE_NETDB_H
  73 # include <netdb.h>
  74 #endif
  75
  76 #if HAVE_NETINET_IN_SYSTM_H
  77 # include <netinet/in_systm.h>
  78 #endif
  79 #if HAVE_NETINET_IN_H
  80 # include <netinet/in.h>
  81 #endif
  82 #if HAVE_NETINET_IP_H
  83 # include <netinet/ip.h>
  84 #endif
  85 #if HAVE_NETINET_IP_ICMP_H
  86 # include <netinet/ip_icmp.h>
  87 #endif
  88 #ifdef HAVE_NETINET_IP_VAR_H
  89 # include <netinet/ip_var.h>
  90 #endif
  91 #if HAVE_NETINET_IP6_H
  92 # include <netinet/ip6.h>
  93 #endif
  94 #if HAVE_NETINET_ICMP6_H
  95 # include <netinet/icmp6.h>
  96 #endif
  97
  98 #include "oping.h"
  99
 100 #if WITH_DEBUG
 101 # define dprintf(...) printf ("%s[%4i]: %-20s: ", __FILE__, __LINE__, __FUNCTION__); printf (__VA_ARGS__)
 102 #else
 103 # define dprintf(...) /**/
 104 #endif
 105
 106 #define PING_ERRMSG_LEN 256
 107
 108 struct pinghost
 109 {
 110         /* username: name passed in by the user */
 111         char                    *username;
 112         /* hostname: name returned by the reverse lookup */
 113         char                    *hostname;
 114         struct sockaddr_storage *addr;
 115         socklen_t                addrlen;
 116         int                      addrfamily;
 117         int                      fd;
 118         int                      ident;
 119         int                      sequence;
 120         struct timeval          *timer;
 121         double                   latency;
 122         uint32_t                 dropped;
 123         int                      recv_ttl;
 124         uint8_t                  recv_qos;
 125         char                    *data;
 126
 127         void                    *context;
 128
 129         struct pinghost         *next;
 130 };
 131
 132 struct pingobj
 133 {
 134         double                   timeout;
 135         int                      ttl;
 136         int                      addrfamily;
 137         uint8_t                  qos;
 138         char                    *data;
 139
 140         struct sockaddr         *srcaddr;
 141         socklen_t                srcaddrlen;
 142
 143         char                    *device;
 144
 145         char                     errmsg[PING_ERRMSG_LEN];
 146
 147         pinghost_t              *head;
 148 };
 149
 150 /*
 151  * private (static) functions
 152  */
 153 /* Even though Posix requires "strerror_r" to return an "int",
 154  * some systems (e.g. the GNU libc) return a "char *" _and_
 155  * ignore the second argument ... -tokkee */
 156 static char *sstrerror (int errnum, char *buf, size_t buflen)
 157 {
 158         buf[0] = 0;
 159
 160 #if !HAVE_STRERROR_R
 161         {
 162                 snprintf (buf, buflen, "Error %i (%#x)", errnum, errnum);
 163         }
 164 /* #endif !HAVE_STRERROR_R */
 165
 166 #elif STRERROR_R_CHAR_P
 167         {
 168                 char *temp;
 169                 temp = strerror_r (errnum, buf, buflen);
 170                 if (buf[0] == 0)
 171                 {
 172                         if ((temp != NULL) && (temp != buf) && (temp[0] != 0))
 173                                 strncpy (buf, temp, buflen);
 174                         else
 175                                 strncpy (buf, "strerror_r did not return "
 176                                                 "an error message", buflen);
 177                 }
 178         }
 179 /* #endif STRERROR_R_CHAR_P */
 180
 181 #else
 182         if (strerror_r (errnum, buf, buflen) != 0)
 183         {
 184                 snprintf (buf, buflen, "Error %i (%#x); "
 185                                 "Additionally, strerror_r failed.",
 186                                 errnum, errnum);
 187         }
 188 #endif /* STRERROR_R_CHAR_P */
 189
 190         buf[buflen - 1] = 0;
 191
 192         return (buf);
 193 } /* char *sstrerror */
 194
 195 static void ping_set_error (pingobj_t *obj, const char *function,
 196                 const char *message)
 197 {
 198         snprintf (obj->errmsg, sizeof (obj->errmsg),
 199                         "%s: %s", function, message);
 200         obj->errmsg[sizeof (obj->errmsg) - 1] = 0;
 201 }
 202
 203 static void ping_set_errno (pingobj_t *obj, int error_number)
 204 {
 205         sstrerror (error_number, obj->errmsg, sizeof (obj->errmsg));
 206 }
 207
 208 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
 209                 struct timeval *res)
 210 {
 211         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
 212         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
 213
 214         while (res->tv_usec > 1000000)
 215         {
 216                 res->tv_usec -= 1000000;
 217                 res->tv_sec++;
 218         }
 219
 220         return (0);
 221 }
 222
 223 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
 224                 struct timeval *res)
 225 {
 226         if ((tv1->tv_sec < tv2->tv_sec)
 227                         || ((tv1->tv_sec == tv2->tv_sec)
 228                                 && (tv1->tv_usec < tv2->tv_usec)))
 229                 return (-1);
 230
 231         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
 232         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
 233
 234         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec >= 0)));
 235
 236         while (res->tv_usec < 0)
 237         {
 238                 res->tv_usec += 1000000;
 239                 res->tv_sec--;
 240         }
 241
 242         return (0);
 243 }
 244
 245 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
 246 {
 247         uint32_t sum = 0;
 248         uint16_t ret = 0;
 249
 250         uint16_t *ptr;
 251
 252         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
 253                 sum += *ptr;
 254
 255         if (len == 1)
 256         {
 257                 *(char *) &ret = *(char *) ptr;
 258                 sum += ret;
 259         }
 260
 261         /* Do this twice to get all possible carries.. */
 262         sum = (sum >> 16) + (sum & 0xFFFF);
 263         sum = (sum >> 16) + (sum & 0xFFFF);
 264
 265         ret = ~sum;
 266
 267         return (ret);
 268 }
 269
 270 static pinghost_t *ping_receive_ipv4 (pingobj_t *obj, char *buffer,
 271                 size_t buffer_len)
 272 {
 273         struct ip *ip_hdr;
 274         struct icmp *icmp_hdr;
 275
 276         size_t ip_hdr_len;
 277
 278         uint16_t recv_checksum;
 279         uint16_t calc_checksum;
 280
 281         uint16_t ident;
 282         uint16_t seq;
 283
 284         pinghost_t *ptr;
 285
 286         if (buffer_len < sizeof (struct ip))
 287                 return (NULL);
 288
 289         ip_hdr     = (struct ip *) buffer;
 290         ip_hdr_len = ip_hdr->ip_hl << 2;
 291
 292         if (buffer_len < ip_hdr_len)
 293                 return (NULL);
 294
 295         buffer     += ip_hdr_len;
 296         buffer_len -= ip_hdr_len;
 297
 298         if (buffer_len < sizeof (struct icmp))
 299                 return (NULL);
 300
 301         icmp_hdr = (struct icmp *) buffer;
 302         buffer     += sizeof (struct icmp);
 303         buffer_len -= sizeof (struct icmp);
 304
 305         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
 306         {
 307                 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
 308                 return (NULL);
 309         }
 310
 311         recv_checksum = icmp_hdr->icmp_cksum;
 312         icmp_hdr->icmp_cksum = 0;
 313         calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
 314                         sizeof (struct icmp) + buffer_len);
 315
 316         if (recv_checksum != calc_checksum)
 317         {
 318                 dprintf ("Checksum missmatch: Got 0x%04"PRIx16", "
 319                                 "calculated 0x%04"PRIx16"\n",
 320                                 recv_checksum, calc_checksum);
 321                 return (NULL);
 322         }
 323
 324         ident = ntohs (icmp_hdr->icmp_id);
 325         seq   = ntohs (icmp_hdr->icmp_seq);
 326
 327         /* We have to iterate over all hosts, since ICMPv4 packets may
 328          * be received on any raw v4 socket. */
 329         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 330         {
 331                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 332                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 333
 334                 if (ptr->addrfamily != AF_INET)
 335                         continue;
 336
 337                 if (!timerisset (ptr->timer))
 338                         continue;
 339
 340                 if (ptr->ident != ident)
 341                         continue;
 342
 343                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 344                         continue;
 345
 346                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
 347                                 "seq = %"PRIu16"\n",
 348                                 ptr->hostname, ident, seq);
 349
 350                 break;
 351         }
 352
 353         if (ptr == NULL)
 354         {
 355                 dprintf ("No match found for ident = 0x%04"PRIx16", seq = %"PRIu16"\n",
 356                                 ident, seq);
 357         }
 358
 359         if (ptr != NULL){
 360                 ptr->recv_ttl = (int)     ip_hdr->ip_ttl;
 361                 ptr->recv_qos = (uint8_t) ip_hdr->ip_tos;
 362         }
 363         return (ptr);
 364 }
 365
 366 #ifndef ICMP6_ECHO_REQUEST
 367 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
 368 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
 369 # else
 370 #  define ICMP6_ECHO_REQUEST 128
 371 # endif
 372 #endif
 373
 374 #ifndef ICMP6_ECHO_REPLY
 375 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
 376 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
 377 # else
 378 #  define ICMP6_ECHO_REPLY 129
 379 # endif
 380 #endif
 381
 382 static pinghost_t *ping_receive_ipv6 (pingobj_t *obj, char *buffer,
 383                 size_t buffer_len)
 384 {
 385         struct icmp6_hdr *icmp_hdr;
 386
 387         uint16_t ident;
 388         uint16_t seq;
 389
 390         pinghost_t *ptr;
 391
 392         if (buffer_len < sizeof (struct icmp6_hdr))
 393                 return (NULL);
 394
 395         icmp_hdr = (struct icmp6_hdr *) buffer;
 396         buffer     += sizeof (struct icmp);
 397         buffer_len -= sizeof (struct icmp);
 398
 399         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 400         {
 401                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 402                 return (NULL);
 403         }
 404
 405         if (icmp_hdr->icmp6_code != 0)
 406         {
 407                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 408                 return (NULL);
 409         }
 410
 411         ident = ntohs (icmp_hdr->icmp6_id);
 412         seq   = ntohs (icmp_hdr->icmp6_seq);
 413
 414         /* We have to iterate over all hosts, since ICMPv6 packets may
 415          * be received on any raw v6 socket. */
 416         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 417         {
 418                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 419                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 420
 421                 if (ptr->addrfamily != AF_INET6)
 422                         continue;
 423
 424                 if (!timerisset (ptr->timer))
 425                         continue;
 426
 427                 if (ptr->ident != ident)
 428                         continue;
 429
 430                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 431                         continue;
 432
 433                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
 434                                 "seq = %"PRIu16"\n",
 435                                 ptr->hostname, ident, seq);
 436
 437                 break;
 438         }
 439
 440         if (ptr == NULL)
 441         {
 442                 dprintf ("No match found for ident = 0x%04"PRIx16", "
 443                                 "seq = %"PRIu16"\n",
 444                                 ident, seq);
 445         }
 446
 447         return (ptr);
 448 }
 449
 450 static int ping_receive_one (pingobj_t *obj, const pinghost_t *ph,
 451                 struct timeval *now)
 452 {
 453         /* Note: 'ph' is not necessarily the host object for which we receive a
 454          * reply. The right object will be returned by ping_receive_ipv*(). For
 455          * now, we can only rely on ph->fd and ph->addrfamily. */
 456
 457         struct timeval diff, pkt_now = *now;
 458         pinghost_t *host = NULL;
 459         int recv_ttl;
 460         uint8_t recv_qos;
 461
 462         /*
 463          * Set up the receive buffer..
 464          */
 465         struct msghdr msghdr;
 466         struct cmsghdr *cmsg;
 467         char payload_buffer[4096];
 468         ssize_t payload_buffer_len;
 469         char control_buffer[4096];
 470         struct iovec payload_iovec;
 471
 472         memset (&payload_iovec, 0, sizeof (payload_iovec));
 473         payload_iovec.iov_base = payload_buffer;
 474         payload_iovec.iov_len = sizeof (payload_buffer);
 475
 476         memset (&msghdr, 0, sizeof (msghdr));
 477         /* unspecified source address */
 478         msghdr.msg_name = NULL;
 479         msghdr.msg_namelen = 0;
 480         /* output buffer vector, see readv(2) */
 481         msghdr.msg_iov = &payload_iovec;
 482         msghdr.msg_iovlen = 1;
 483         /* output buffer for control messages */
 484         msghdr.msg_control = control_buffer;
 485         msghdr.msg_controllen = sizeof (control_buffer);
 486         /* flags; this is an output only field.. */
 487         msghdr.msg_flags = 0;
 488 #ifdef MSG_XPG4_2
 489         msghdr.msg_flags |= MSG_XPG4_2;
 490 #endif
 491
 492         payload_buffer_len = recvmsg (ph->fd, &msghdr, /* flags = */ 0);
 493         if (payload_buffer_len < 0)
 494         {
 495 #if WITH_DEBUG
 496                 char errbuf[PING_ERRMSG_LEN];
 497                 dprintf ("recvfrom: %s\n",
 498                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 499 #endif
 500                 return (-1);
 501         }
 502         dprintf ("Read %zi bytes from fd = %i\n", payload_buffer_len, ph->fd);
 503
 504         /* Iterate over all auxiliary data in msghdr */
 505         recv_ttl = -1;
 506         recv_qos = 0;
 507         for (cmsg = CMSG_FIRSTHDR (&msghdr); /* {{{ */
 508                         cmsg != NULL;
 509                         cmsg = CMSG_NXTHDR (&msghdr, cmsg))
 510         {
 511                 if (cmsg->cmsg_level == SOL_SOCKET)
 512                 {
 513 #ifdef SO_TIMESTAMP
 514                         if (cmsg->cmsg_type == SO_TIMESTAMP)
 515                                 memcpy (&pkt_now, CMSG_DATA (cmsg), sizeof (pkt_now));
 516 #endif /* SO_TIMESTAMP */
 517                 }
 518                 else if (ph->addrfamily == AF_INET) /* {{{ */
 519                 {
 520                         if (cmsg->cmsg_level != IPPROTO_IP)
 521                                 continue;
 522
 523                         if (cmsg->cmsg_type == IP_TOS)
 524                         {
 525                                 memcpy (&recv_qos, CMSG_DATA (cmsg),
 526                                                 sizeof (recv_qos));
 527                                 dprintf ("TOSv4 = 0x%02"PRIx8";\n", recv_qos);
 528                         } else
 529                         if (cmsg->cmsg_type == IP_TTL)
 530                         {
 531                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 532                                                 sizeof (recv_ttl));
 533                                 dprintf ("TTLv4 = %i;\n", recv_ttl);
 534                         }
 535                         else
 536                         {
 537                                 dprintf ("Not handling option %i.\n",
 538                                                 cmsg->cmsg_type);
 539                         }
 540                 } /* }}} */
 541                 else if (ph->addrfamily == AF_INET6) /* {{{ */
 542                 {
 543                         if (cmsg->cmsg_level != IPPROTO_IPV6)
 544                                 continue;
 545
 546                         if (cmsg->cmsg_type == IPV6_TCLASS)
 547                         {
 548                                 memcpy (&recv_qos, CMSG_DATA (cmsg),
 549                                                 sizeof (recv_qos));
 550                                 dprintf ("TOSv6 = 0x%02"PRIx8";\n", recv_qos);
 551                         } else
 552 #ifdef IPV6_HOPLIMIT
 553                         if (cmsg->cmsg_type == IPV6_HOPLIMIT)
 554                         {
 555                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 556                                                 sizeof (recv_ttl));
 557                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 558                         }
 559                         else
 560 #endif
 561 #ifdef IPV6_UNICAST_HOPS
 562                         if (cmsg->cmsg_type == IPV6_UNICAST_HOPS)
 563                         {
 564                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 565                                                 sizeof (recv_ttl));
 566                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 567                         }
 568                         else
 569 #endif
 570 #ifdef IPV6_MULTICAST_HOPS
 571                         if (cmsg->cmsg_type == IPV6_MULTICAST_HOPS)
 572                         {
 573                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 574                                                 sizeof (recv_ttl));
 575                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 576                         }
 577                         else
 578 #endif
 579                         {
 580                                 dprintf ("Not handling option %i.\n",
 581                                                 cmsg->cmsg_type);
 582                         }
 583                 } /* }}} */
 584                 else
 585                 {
 586                         dprintf ("Don't know how to handle "
 587                                         "unknown protocol %i.\n",
 588                                         cmsg->cmsg_level);
 589                 }
 590         } /* }}} for (cmsg) */
 591
 592         if (ph->addrfamily == AF_INET)
 593         {
 594                 host = ping_receive_ipv4 (obj, payload_buffer, payload_buffer_len);
 595                 if (host == NULL)
 596                         return (-1);
 597         }
 598         else if (ph->addrfamily == AF_INET6)
 599         {
 600                 host = ping_receive_ipv6 (obj, payload_buffer, payload_buffer_len);
 601                 if (host == NULL)
 602                         return (-1);
 603         }
 604         else
 605         {
 606                 dprintf ("ping_receive_one: Unknown address family %i.\n",
 607                                 ph->addrfamily);
 608                 return (-1);
 609         }
 610
 611         dprintf ("rcvd: %12i.%06i\n",
 612                         (int) pkt_now.tv_sec,
 613                         (int) pkt_now.tv_usec);
 614         dprintf ("sent: %12i.%06i\n",
 615                         (int) host->timer->tv_sec,
 616                         (int) host->timer->tv_usec);
 617
 618         if (ping_timeval_sub (&pkt_now, host->timer, &diff) < 0)
 619         {
 620                 timerclear (host->timer);
 621                 return (-1);
 622         }
 623
 624         dprintf ("diff: %12i.%06i\n",
 625                         (int) diff.tv_sec,
 626                         (int) diff.tv_usec);
 627
 628         if (recv_ttl >= 0)
 629                 host->recv_ttl = recv_ttl;
 630         host->recv_qos = recv_qos;
 631
 632         host->latency  = ((double) diff.tv_usec) / 1000.0;
 633         host->latency += ((double) diff.tv_sec)  * 1000.0;
 634
 635         timerclear (host->timer);
 636
 637         return (0);
 638 }
 639
 640 static int ping_receive_all (pingobj_t *obj)
 641 {
 642         fd_set read_fds;
 643         fd_set err_fds;
 644         int num_fds;
 645         int max_fd;
 646
 647         pinghost_t *ph;
 648         pinghost_t *ptr;
 649
 650         struct timeval endtime;
 651         struct timeval nowtime;
 652         struct timeval timeout;
 653         int status;
 654
 655         int ret;
 656
 657         ph = obj->head;
 658         ret = 0;
 659
 660         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 661         {
 662                 ptr->latency  = -1.0;
 663                 ptr->recv_ttl = -1;
 664         }
 665
 666         if (gettimeofday (&nowtime, NULL) == -1)
 667         {
 668                 ping_set_errno (obj, errno);
 669                 return (-1);
 670         }
 671
 672         /* Set up timeout */
 673         timeout.tv_sec = (time_t) obj->timeout;
 674         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 675
 676         dprintf ("Set timeout to %i.%06i seconds\n",
 677                         (int) timeout.tv_sec,
 678                         (int) timeout.tv_usec);
 679
 680         ping_timeval_add (&nowtime, &timeout, &endtime);
 681
 682         while (1)
 683         {
 684                 FD_ZERO (&read_fds);
 685                 FD_ZERO (&err_fds);
 686                 num_fds =  0;
 687                 max_fd = -1;
 688
 689                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 690                 {
 691                         if (!timerisset (ptr->timer))
 692                                 continue;
 693
 694                         FD_SET (ptr->fd, &read_fds);
 695                         FD_SET (ptr->fd, &err_fds);
 696                         num_fds++;
 697
 698                         if (max_fd < ptr->fd)
 699                                 max_fd = ptr->fd;
 700                 }
 701
 702                 if (num_fds == 0)
 703                         break;
 704
 705                 if (gettimeofday (&nowtime, NULL) == -1)
 706                 {
 707                         ping_set_errno (obj, errno);
 708                         return (-1);
 709                 }
 710
 711                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 712                         break;
 713
 714                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_fds,
 715                                 (int) timeout.tv_sec,
 716                                 (int) timeout.tv_usec);
 717
 718                 status = select (max_fd + 1, &read_fds, NULL, &err_fds, &timeout);
 719
 720                 if (gettimeofday (&nowtime, NULL) == -1)
 721                 {
 722                         ping_set_errno (obj, errno);
 723                         return (-1);
 724                 }
 725
 726                 if ((status == -1) && (errno == EINTR))
 727                 {
 728                         dprintf ("select was interrupted by signal..\n");
 729                         continue;
 730                 }
 731                 else if (status < 0)
 732                 {
 733 #if WITH_DEBUG
 734                         char errbuf[PING_ERRMSG_LEN];
 735                         dprintf ("select: %s\n",
 736                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 737 #endif
 738                         break;
 739                 }
 740                 else if (status == 0)
 741                 {
 742                         dprintf ("select timed out\n");
 743                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 744                                 if (ptr->latency < 0.0)
 745                                         ptr->dropped++;
 746                         break;
 747                 }
 748
 749                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 750                 {
 751                         if (FD_ISSET (ptr->fd, &read_fds))
 752                         {
 753                                 if (ping_receive_one (obj, ptr, &nowtime) == 0)
 754                                         ret++;
 755                         }
 756                         else if (FD_ISSET (ptr->fd, &err_fds))
 757                         {
 758                                 /* clear the timer in this case so that we
 759                                  * don't run into an endless loop. */
 760                                 /* TODO: Set an error flag in this case. */
 761                                 timerclear (ptr->timer);
 762                         }
 763                 }
 764         } /* while (1) */
 765
 766         return (ret);
 767 }
 768
 769 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 770  * Sending functions:                                                        *
 771  *                                                                           *
 772  * ping_send_all                                                             *
 773  * +-> ping_send_one_ipv4                                                    *
 774  * `-> ping_send_one_ipv6                                                    *
 775  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 776 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 777                 const void *buf, size_t buflen)
 778 {
 779         ssize_t ret;
 780
 781         if (gettimeofday (ph->timer, NULL) == -1)
 782         {
 783                 timerclear (ph->timer);
 784                 return (-1);
 785         }
 786
 787         ret = sendto (ph->fd, buf, buflen, 0,
 788                         (struct sockaddr *) ph->addr, ph->addrlen);
 789
 790         if (ret < 0)
 791         {
 792 #if defined(EHOSTUNREACH)
 793                 if (errno == EHOSTUNREACH)
 794                         return (0);
 795 #endif
 796 #if defined(ENETUNREACH)
 797                 if (errno == ENETUNREACH)
 798                         return (0);
 799 #endif
 800                 ping_set_errno (obj, errno);
 801         }
 802
 803         return (ret);
 804 }
 805
 806 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 807 {
 808         struct icmp *icmp4;
 809         int status;
 810
 811         char buf[4096];
 812         int  buflen;
 813
 814         char *data;
 815         int   datalen;
 816
 817         dprintf ("ph->hostname = %s\n", ph->hostname);
 818
 819         memset (buf, '\0', sizeof (buf));
 820         icmp4 = (struct icmp *) buf;
 821         data  = (char *) (icmp4 + 1);
 822
 823         icmp4->icmp_type  = ICMP_ECHO;
 824         icmp4->icmp_code  = 0;
 825         icmp4->icmp_cksum = 0;
 826         icmp4->icmp_id    = htons (ph->ident);
 827         icmp4->icmp_seq   = htons (ph->sequence);
 828
 829         buflen = 4096 - sizeof (struct icmp);
 830         strncpy (data, ph->data, buflen);
 831         datalen = strlen (data);
 832
 833         buflen = datalen + sizeof (struct icmp);
 834
 835         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 836
 837         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 838
 839         status = ping_sendto (obj, ph, buf, buflen);
 840         if (status < 0)
 841         {
 842                 perror ("ping_sendto");
 843                 return (-1);
 844         }
 845
 846         dprintf ("sendto: status = %i\n", status);
 847
 848         return (0);
 849 }
 850
 851 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 852 {
 853         struct icmp6_hdr *icmp6;
 854         int status;
 855
 856         char buf[4096];
 857         int  buflen;
 858
 859         char *data;
 860         int   datalen;
 861
 862         dprintf ("ph->hostname = %s\n", ph->hostname);
 863
 864         memset (buf, '\0', sizeof (buf));
 865         icmp6 = (struct icmp6_hdr *) buf;
 866         data  = (char *) (icmp6 + 1);
 867
 868         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 869         icmp6->icmp6_code  = 0;
 870         /* The checksum will be calculated by the TCP/IP stack.  */
 871         /* FIXME */
 872         icmp6->icmp6_cksum = 0;
 873         icmp6->icmp6_id    = htons (ph->ident);
 874         icmp6->icmp6_seq   = htons (ph->sequence);
 875
 876         buflen = 4096 - sizeof (struct icmp6_hdr);
 877         strncpy (data, ph->data, buflen);
 878         datalen = strlen (data);
 879
 880         buflen = datalen + sizeof (struct icmp6_hdr);
 881
 882         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 883
 884         status = ping_sendto (obj, ph, buf, buflen);
 885         if (status < 0)
 886         {
 887                 perror ("ping_sendto");
 888                 return (-1);
 889         }
 890
 891         dprintf ("sendto: status = %i\n", status);
 892
 893         return (0);
 894 }
 895
 896 static int ping_send_all (pingobj_t *obj)
 897 {
 898         pinghost_t *ph;
 899         pinghost_t *ptr;
 900
 901         int ret;
 902
 903         ret = 0;
 904         ph = obj->head;
 905
 906         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 907         {
 908                 /* start timer.. The GNU `ping6' starts the timer before
 909                  * sending the packet, so I will do that too */
 910                 if (gettimeofday (ptr->timer, NULL) == -1)
 911                 {
 912 #if WITH_DEBUG
 913                         char errbuf[PING_ERRMSG_LEN];
 914                         dprintf ("gettimeofday: %s\n",
 915                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 916 #endif
 917                         timerclear (ptr->timer);
 918                         ret--;
 919                         continue;
 920                 }
 921                 else
 922                 {
 923                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 924                 }
 925
 926                 if (ptr->addrfamily == AF_INET6)
 927                 {
 928                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 929                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 930                         {
 931                                 timerclear (ptr->timer);
 932                                 ret--;
 933                                 continue;
 934                         }
 935                 }
 936                 else if (ptr->addrfamily == AF_INET)
 937                 {
 938                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 939                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 940                         {
 941                                 timerclear (ptr->timer);
 942                                 ret--;
 943                                 continue;
 944                         }
 945                 }
 946                 else /* this should not happen */
 947                 {
 948                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 949                         timerclear (ptr->timer);
 950                         ret--;
 951                         continue;
 952                 }
 953
 954                 ptr->sequence++;
 955         }
 956
 957         return (ret);
 958 }
 959
 960 /*
 961  * Set the TTL of a socket protocol independently.
 962  */
 963 static int ping_set_ttl (pinghost_t *ph, int ttl)
 964 {
 965         int ret = -2;
 966
 967         if (ph->addrfamily == AF_INET)
 968         {
 969                 dprintf ("Setting TTLv4 to %i\n", ttl);
 970                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL,
 971                                 &ttl, sizeof (ttl));
 972         }
 973         else if (ph->addrfamily == AF_INET6)
 974         {
 975                 dprintf ("Setting TTLv6 to %i\n", ttl);
 976                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
 977                                 &ttl, sizeof (ttl));
 978         }
 979
 980         return (ret);
 981 }
 982
 983 /*
 984  * Set the TOS of a socket protocol independently.
 985  *
 986  * Using SOL_SOCKET / SO_PRIORITY might be a protocol independent way to
 987  * set this. See socket(7) for details.
 988  */
 989 static int ping_set_qos (pingobj_t *obj, pinghost_t *ph, uint8_t qos)
 990 {
 991         int ret = EINVAL;
 992         char errbuf[PING_ERRMSG_LEN];
 993
 994         if (ph->addrfamily == AF_INET)
 995         {
 996                 dprintf ("Setting TP_TOS to %#04"PRIx8"\n", qos);
 997                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TOS,
 998                                 &qos, sizeof (qos));
 999                 if (ret != 0)
1000                 {
1001                         ret = errno;
1002                         ping_set_error (obj, "ping_set_qos",
1003                                         sstrerror (ret, errbuf, sizeof (errbuf)));
1004                         dprintf ("Setting TP_TOS failed: %s\n", errbuf);
1005                 }
1006         }
1007         else if (ph->addrfamily == AF_INET6)
1008         {
1009                 /* IPV6_TCLASS requires an "int". */
1010                 int tmp = (int) qos;
1011
1012                 dprintf ("Setting IPV6_TCLASS to %#04"PRIx8" (%i)\n", qos, tmp);
1013                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_TCLASS,
1014                                 &tmp, sizeof (tmp));
1015                 if (ret != 0)
1016                 {
1017                         ret = errno;
1018                         ping_set_error (obj, "ping_set_qos",
1019                                         sstrerror (ret, errbuf, sizeof (errbuf)));
1020                         dprintf ("Setting IPV6_TCLASS failed: %s\n", errbuf);
1021                 }
1022         }
1023
1024         return (ret);
1025 }
1026
1027 static int ping_get_ident (void)
1028 {
1029         int fd;
1030         static int did_seed = 0;
1031
1032         int retval;
1033
1034         if (did_seed == 0)
1035         {
1036                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
1037                 {
1038                         unsigned int seed;
1039
1040                         if (read (fd, &seed, sizeof (seed)) != -1)
1041                         {
1042                                 did_seed = 1;
1043                                 dprintf ("Random seed:   %#x\n", seed);
1044                                 srandom (seed);
1045                         }
1046
1047                         close (fd);
1048                 }
1049 #if WITH_DEBUG
1050                 else
1051                 {
1052                         char errbuf[PING_ERRMSG_LEN];
1053                         dprintf ("open (/dev/urandom): %s\n",
1054                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1055                 }
1056 #endif
1057         }
1058
1059         retval = (int) random ();
1060
1061         dprintf ("Random number: %#x\n", retval);
1062
1063         return (retval);
1064 }
1065
1066 static pinghost_t *ping_alloc (void)
1067 {
1068         pinghost_t *ph;
1069         size_t      ph_size;
1070
1071         ph_size = sizeof (pinghost_t)
1072                 + sizeof (struct sockaddr_storage)
1073                 + sizeof (struct timeval);
1074
1075         ph = (pinghost_t *) malloc (ph_size);
1076         if (ph == NULL)
1077                 return (NULL);
1078
1079         memset (ph, '\0', ph_size);
1080
1081         ph->timer   = (struct timeval *) (ph + 1);
1082         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
1083
1084         ph->addrlen = sizeof (struct sockaddr_storage);
1085         ph->fd      = -1;
1086         ph->latency = -1.0;
1087         ph->dropped = 0;
1088         ph->ident   = ping_get_ident () & 0xFFFF;
1089
1090         return (ph);
1091 }
1092
1093 static void ping_free (pinghost_t *ph)
1094 {
1095         if (ph->fd >= 0)
1096                 close (ph->fd);
1097
1098         if (ph->username != NULL)
1099                 free (ph->username);
1100
1101         if (ph->hostname != NULL)
1102                 free (ph->hostname);
1103
1104         if (ph->data != NULL)
1105                 free (ph->data);
1106
1107         free (ph);
1108 }
1109
1110 /*
1111  * public methods
1112  */
1113 const char *ping_get_error (pingobj_t *obj)
1114 {
1115         if (obj == NULL)
1116                 return (NULL);
1117         return (obj->errmsg);
1118 }
1119
1120 pingobj_t *ping_construct (void)
1121 {
1122         pingobj_t *obj;
1123
1124         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
1125                 return (NULL);
1126         memset (obj, 0, sizeof (pingobj_t));
1127
1128         obj->timeout    = PING_DEF_TIMEOUT;
1129         obj->ttl        = PING_DEF_TTL;
1130         obj->addrfamily = PING_DEF_AF;
1131         obj->data       = strdup (PING_DEF_DATA);
1132         obj->qos        = 0;
1133
1134         return (obj);
1135 }
1136
1137 void ping_destroy (pingobj_t *obj)
1138 {
1139         pinghost_t *current;
1140         pinghost_t *next;
1141
1142         if (obj == NULL)
1143                 return;
1144
1145         current = obj->head;
1146         next = NULL;
1147
1148         while (current != NULL)
1149         {
1150                 next = current->next;
1151                 ping_free (current);
1152                 current = next;
1153         }
1154
1155         if (obj->data != NULL)
1156                 free (obj->data);
1157
1158         if (obj->srcaddr != NULL)
1159                 free (obj->srcaddr);
1160
1161         if (obj->device != NULL)
1162                 free (obj->device);
1163
1164         free (obj);
1165
1166         return;
1167 }
1168
1169 int ping_setopt (pingobj_t *obj, int option, void *value)
1170 {
1171         int ret = 0;
1172
1173         if ((obj == NULL) || (value == NULL))
1174                 return (-1);
1175
1176         switch (option)
1177         {
1178                 case PING_OPT_QOS:
1179                 {
1180                         pinghost_t *ph;
1181
1182                         obj->qos = *((uint8_t *) value);
1183                         for (ph = obj->head; ph != NULL; ph = ph->next)
1184                                 ping_set_qos (obj, ph, obj->qos);
1185                         break;
1186                 }
1187
1188                 case PING_OPT_TIMEOUT:
1189                         obj->timeout = *((double *) value);
1190                         if (obj->timeout < 0.0)
1191                         {
1192                                 obj->timeout = PING_DEF_TIMEOUT;
1193                                 ret = -1;
1194                         }
1195                         break;
1196
1197                 case PING_OPT_TTL:
1198                         obj->ttl = *((int *) value);
1199                         if ((obj->ttl < 1) || (obj->ttl > 255))
1200                         {
1201                                 obj->ttl = PING_DEF_TTL;
1202                                 ret = -1;
1203                         }
1204                         else
1205                         {
1206                                 pinghost_t *ph;
1207
1208                                 for (ph = obj->head; ph != NULL; ph = ph->next)
1209                                         ping_set_ttl (ph, obj->ttl);
1210                         }
1211                         break;
1212
1213                 case PING_OPT_AF:
1214                         obj->addrfamily = *((int *) value);
1215                         if ((obj->addrfamily != AF_UNSPEC)
1216                                         && (obj->addrfamily != AF_INET)
1217                                         && (obj->addrfamily != AF_INET6))
1218                         {
1219                                 obj->addrfamily = PING_DEF_AF;
1220                                 ret = -1;
1221                         }
1222                         if (obj->srcaddr != NULL)
1223                         {
1224                                 free (obj->srcaddr);
1225                                 obj->srcaddr = NULL;
1226                         }
1227                         break;
1228
1229                 case PING_OPT_DATA:
1230                         if (obj->data != NULL)
1231                         {
1232                                 free (obj->data);
1233                                 obj->data = NULL;
1234                         }
1235                         obj->data = strdup ((const char *) value);
1236                         break;
1237
1238                 case PING_OPT_SOURCE:
1239                 {
1240                         char            *hostname = (char *) value;
1241                         struct addrinfo  ai_hints;
1242                         struct addrinfo *ai_list;
1243                         int              status;
1244 #if WITH_DEBUG
1245                         if (obj->addrfamily != AF_UNSPEC)
1246                         {
1247                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1248                         }
1249 #endif
1250                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1251                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1252 #if defined(AI_ADDRCONFIG)
1253                         ai_hints.ai_flags = AI_ADDRCONFIG;
1254 #endif
1255                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1256                         if (status != 0)
1257                         {
1258 #if defined(EAI_SYSTEM)
1259                                 char errbuf[PING_ERRMSG_LEN];
1260 #endif
1261                                 ping_set_error (obj, "getaddrinfo",
1262 #if defined(EAI_SYSTEM)
1263                                                 (status == EAI_SYSTEM)
1264                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1265 #endif
1266                                                 gai_strerror (status));
1267                                 ret = -1;
1268                                 break;
1269                         }
1270 #if WITH_DEBUG
1271                         if (ai_list->ai_next != NULL)
1272                         {
1273                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1274                         }
1275 #endif
1276                         if (obj->srcaddr == NULL)
1277                         {
1278                                 obj->srcaddrlen = 0;
1279                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1280                                 if (obj->srcaddr == NULL)
1281                                 {
1282                                         ping_set_errno (obj, errno);
1283                                         ret = -1;
1284                                         freeaddrinfo (ai_list);
1285                                         break;
1286                                 }
1287                         }
1288                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1289                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1290                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1291                                         ai_list->ai_addrlen);
1292                         obj->srcaddrlen = ai_list->ai_addrlen;
1293                         obj->addrfamily = ai_list->ai_family;
1294
1295                         freeaddrinfo (ai_list);
1296                 } /* case PING_OPT_SOURCE */
1297                 break;
1298
1299                 case PING_OPT_DEVICE:
1300                 {
1301 #ifdef SO_BINDTODEVICE
1302                         char *device = strdup ((char *) value);
1303
1304                         if (device == NULL)
1305                         {
1306                                 ping_set_errno (obj, errno);
1307                                 ret = -1;
1308                                 break;
1309                         }
1310
1311                         if (obj->device != NULL)
1312                                 free (obj->device);
1313                         obj->device = device;
1314 #else /* ! SO_BINDTODEVICE */
1315                         ping_set_errno (obj, ENOTSUP);
1316                         ret = -1;
1317 #endif /* ! SO_BINDTODEVICE */
1318                 } /* case PING_OPT_DEVICE */
1319                 break;
1320
1321                 default:
1322                         ret = -2;
1323         } /* switch (option) */
1324
1325         return (ret);
1326 } /* int ping_setopt */
1327
1328
1329 int ping_send (pingobj_t *obj)
1330 {
1331         int ret;
1332
1333         if (obj == NULL)
1334                 return (-1);
1335
1336         if (ping_send_all (obj) < 0)
1337                 return (-1);
1338
1339         if ((ret = ping_receive_all (obj)) < 0)
1340                 return (-2);
1341
1342         return (ret);
1343 }
1344
1345 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1346 {
1347         while (ph != NULL)
1348         {
1349                 if (strcasecmp (ph->username, host) == 0)
1350                         break;
1351
1352                 ph = ph->next;
1353         }
1354
1355         return (ph);
1356 }
1357
1358 int ping_host_add (pingobj_t *obj, const char *host)
1359 {
1360         pinghost_t *ph;
1361
1362         struct addrinfo  ai_hints;
1363         struct addrinfo *ai_list, *ai_ptr;
1364         int              ai_return;
1365
1366         if ((obj == NULL) || (host == NULL))
1367                 return (-1);
1368
1369         dprintf ("host = %s\n", host);
1370
1371         if (ping_host_search (obj->head, host) != NULL)
1372                 return (0);
1373
1374         memset (&ai_hints, '\0', sizeof (ai_hints));
1375         ai_hints.ai_flags     = 0;
1376 #ifdef AI_ADDRCONFIG
1377         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1378 #endif
1379 #ifdef AI_CANONNAME
1380         ai_hints.ai_flags    |= AI_CANONNAME;
1381 #endif
1382         ai_hints.ai_family    = obj->addrfamily;
1383         ai_hints.ai_socktype  = SOCK_RAW;
1384
1385         if ((ph = ping_alloc ()) == NULL)
1386         {
1387                 dprintf ("Out of memory!\n");
1388                 return (-1);
1389         }
1390
1391         if ((ph->username = strdup (host)) == NULL)
1392         {
1393                 dprintf ("Out of memory!\n");
1394                 ping_set_errno (obj, errno);
1395                 ping_free (ph);
1396                 return (-1);
1397         }
1398
1399         if ((ph->hostname = strdup (host)) == NULL)
1400         {
1401                 dprintf ("Out of memory!\n");
1402                 ping_set_errno (obj, errno);
1403                 ping_free (ph);
1404                 return (-1);
1405         }
1406
1407         /* obj->data is not garuanteed to be != NULL */
1408         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1409         {
1410                 dprintf ("Out of memory!\n");
1411                 ping_set_errno (obj, errno);
1412                 ping_free (ph);
1413                 return (-1);
1414         }
1415
1416         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1417         {
1418 #if defined(EAI_SYSTEM)
1419                 char errbuf[PING_ERRMSG_LEN];
1420 #endif
1421                 dprintf ("getaddrinfo failed\n");
1422                 ping_set_error (obj, "getaddrinfo",
1423 #if defined(EAI_SYSTEM)
1424                                                 (ai_return == EAI_SYSTEM)
1425                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1426 #endif
1427                                 gai_strerror (ai_return));
1428                 ping_free (ph);
1429                 return (-1);
1430         }
1431
1432         if (ai_list == NULL)
1433                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1434
1435         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1436         {
1437                 ph->fd = -1;
1438
1439                 if (ai_ptr->ai_family == AF_INET)
1440                 {
1441                         ai_ptr->ai_socktype = SOCK_RAW;
1442                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1443                 }
1444                 else if (ai_ptr->ai_family == AF_INET6)
1445                 {
1446                         ai_ptr->ai_socktype = SOCK_RAW;
1447                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1448                 }
1449                 else
1450                 {
1451                         char errmsg[PING_ERRMSG_LEN];
1452
1453                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1454                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1455
1456                         dprintf ("%s", errmsg);
1457                         ping_set_error (obj, "getaddrinfo", errmsg);
1458                         continue;
1459                 }
1460
1461                 /* TODO: Move this to a static function `ping_open_socket' and
1462                  * call it whenever the socket dies. */
1463                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1464                 if (ph->fd == -1)
1465                 {
1466 #if WITH_DEBUG
1467                         char errbuf[PING_ERRMSG_LEN];
1468                         dprintf ("socket: %s\n",
1469                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1470 #endif
1471                         ping_set_errno (obj, errno);
1472                         continue;
1473                 }
1474
1475                 if (obj->srcaddr != NULL)
1476                 {
1477                         assert (obj->srcaddrlen > 0);
1478                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1479
1480                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1481                         {
1482 #if WITH_DEBUG
1483                                 char errbuf[PING_ERRMSG_LEN];
1484                                 dprintf ("bind: %s\n",
1485                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1486 #endif
1487                                 ping_set_errno (obj, errno);
1488                                 close (ph->fd);
1489                                 ph->fd = -1;
1490                                 continue;
1491                         }
1492                 }
1493
1494 #ifdef SO_BINDTODEVICE
1495                 if (obj->device != NULL)
1496                 {
1497                         if (setsockopt (ph->fd, SOL_SOCKET, SO_BINDTODEVICE,
1498                                         obj->device, strlen (obj->device) + 1) != 0)
1499                         {
1500 #if WITH_DEBUG
1501                                 char errbuf[PING_ERRMSG_LEN];
1502                                 dprintf ("setsockopt (SO_BINDTODEVICE): %s\n",
1503                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1504 #endif
1505                                 ping_set_errno (obj, errno);
1506                                 close (ph->fd);
1507                                 ph->fd = -1;
1508                                 continue;
1509                         }
1510                 }
1511 #endif /* SO_BINDTODEVICE */
1512 #ifdef SO_TIMESTAMP
1513                 if (1) /* {{{ */
1514                 {
1515                         int status;
1516                         int opt = 1;
1517
1518                         status = setsockopt (ph->fd,
1519                                         SOL_SOCKET, SO_TIMESTAMP,
1520                                         &opt, sizeof (opt));
1521                         if (status != 0)
1522                         {
1523 #if WITH_DEBUG
1524                                 char errbuf[PING_ERRMSG_LEN];
1525                                 dprintf ("setsockopt (SO_TIMESTAMP): %s\n",
1526                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1527 #endif
1528                                 ping_set_errno (obj, errno);
1529                                 close (ph->fd);
1530                                 ph->fd = -1;
1531                                 continue;
1532                         }
1533                 } /* }}} if (1) */
1534 #endif /* SO_TIMESTAMP */
1535                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1536                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1537                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1538                 ph->addrlen = ai_ptr->ai_addrlen;
1539                 ph->addrfamily = ai_ptr->ai_family;
1540
1541 #ifdef AI_CANONNAME
1542                 if ((ai_ptr->ai_canonname != NULL)
1543                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1544                 {
1545                         char *old_hostname;
1546
1547                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1548                                         ph->hostname, ai_ptr->ai_canonname);
1549
1550                         old_hostname = ph->hostname;
1551                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1552                         {
1553                                 /* strdup failed, falling back to old hostname */
1554                                 ph->hostname = old_hostname;
1555                         }
1556                         else if (old_hostname != NULL)
1557                         {
1558                                 free (old_hostname);
1559                         }
1560                 }
1561 #endif /* AI_CANONNAME */
1562
1563                 if (ph->addrfamily == AF_INET)
1564                 {
1565                         int opt;
1566
1567 #ifdef IP_RECVTOS
1568                         /* Enable receiving the TOS field */
1569                         opt = 1;
1570                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTOS,
1571                                         &opt, sizeof (opt));
1572 #endif  /* IP_RECVTOS */
1573
1574                         /* Enable receiving the TTL field */
1575                         opt = 1;
1576                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1577                                         &opt, sizeof (opt));
1578                 }
1579 #if defined(IPV6_RECVHOPLIMIT) || defined(IPV6_RECVTCLASS)
1580                 else if (ph->addrfamily == AF_INET6)
1581                 {
1582                         int opt;
1583
1584 # if defined(IPV6_RECVHOPLIMIT)
1585                         /* For details see RFC 3542, section 6.3. */
1586                         opt = 1;
1587                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1588                                         &opt, sizeof (opt));
1589 # endif /* IPV6_RECVHOPLIMIT */
1590
1591 # if defined(IPV6_RECVTCLASS)
1592                         /* For details see RFC 3542, section 6.5. */
1593                         opt = 1;
1594                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVTCLASS,
1595                                         &opt, sizeof (opt));
1596 # endif /* IPV6_RECVTCLASS */
1597                 }
1598 #endif /* IPV6_RECVHOPLIMIT || IPV6_RECVTCLASS */
1599
1600                 break;
1601         } /* for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next) */
1602
1603         freeaddrinfo (ai_list);
1604
1605         if (ph->fd < 0)
1606         {
1607                 ping_free (ph);
1608                 return (-1);
1609         }
1610
1611         /*
1612          * Adding in the front is much easier, but then the iterator will
1613          * return the host that was added last as first host. That's just not
1614          * nice. -octo
1615          */
1616         if (obj->head == NULL)
1617         {
1618                 obj->head = ph;
1619         }
1620         else
1621         {
1622                 pinghost_t *hptr;
1623
1624                 hptr = obj->head;
1625                 while (hptr->next != NULL)
1626                         hptr = hptr->next;
1627
1628                 assert ((hptr != NULL) && (hptr->next == NULL));
1629                 hptr->next = ph;
1630         }
1631
1632         ping_set_ttl (ph, obj->ttl);
1633         ping_set_qos (obj, ph, obj->qos);
1634
1635         return (0);
1636 } /* int ping_host_add */
1637
1638 int ping_host_remove (pingobj_t *obj, const char *host)
1639 {
1640         pinghost_t *pre, *cur;
1641
1642         if ((obj == NULL) || (host == NULL))
1643                 return (-1);
1644
1645         pre = NULL;
1646         cur = obj->head;
1647
1648         while (cur != NULL)
1649         {
1650                 if (strcasecmp (host, cur->username) == 0)
1651                         break;
1652
1653                 pre = cur;
1654                 cur = cur->next;
1655         }
1656
1657         if (cur == NULL)
1658         {
1659                 ping_set_error (obj, "ping_host_remove", "Host not found");
1660                 return (-1);
1661         }
1662
1663         if (pre == NULL)
1664                 obj->head = cur->next;
1665         else
1666                 pre->next = cur->next;
1667
1668         ping_free (cur);
1669
1670         return (0);
1671 }
1672
1673 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1674 {
1675         if (obj == NULL)
1676                 return (NULL);
1677         return ((pingobj_iter_t *) obj->head);
1678 }
1679
1680 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1681 {
1682         if (iter == NULL)
1683                 return (NULL);
1684         return ((pingobj_iter_t *) iter->next);
1685 }
1686
1687 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1688                 void *buffer, size_t *buffer_len)
1689 {
1690         int ret = EINVAL;
1691
1692         size_t orig_buffer_len = *buffer_len;
1693
1694         if ((iter == NULL) || (buffer_len == NULL))
1695                 return (-1);
1696
1697         if ((buffer == NULL) && (*buffer_len != 0 ))
1698                 return (-1);
1699
1700         switch (info)
1701         {
1702                 case PING_INFO_USERNAME:
1703                         ret = ENOMEM;
1704                         *buffer_len = strlen (iter->username) + 1;
1705                         if (orig_buffer_len <= *buffer_len)
1706                                 break;
1707                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1708                          * will copy `*buffer_len' and pad the rest of
1709                          * `buffer' with null-bytes */
1710                         strncpy (buffer, iter->username, orig_buffer_len);
1711                         ret = 0;
1712                         break;
1713
1714                 case PING_INFO_HOSTNAME:
1715                         ret = ENOMEM;
1716                         *buffer_len = strlen (iter->hostname) + 1;
1717                         if (orig_buffer_len < *buffer_len)
1718                                 break;
1719                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1720                          * will copy `*buffer_len' and pad the rest of
1721                          * `buffer' with null-bytes */
1722                         strncpy (buffer, iter->hostname, orig_buffer_len);
1723                         ret = 0;
1724                         break;
1725
1726                 case PING_INFO_ADDRESS:
1727                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1728                                         iter->addrlen,
1729                                         (char *) buffer,
1730                                         *buffer_len,
1731                                         NULL, 0,
1732                                         NI_NUMERICHOST);
1733                         if (ret != 0)
1734                         {
1735                                 if ((ret == EAI_MEMORY)
1736 #ifdef EAI_OVERFLOW
1737                                                 || (ret == EAI_OVERFLOW)
1738 #endif
1739                                    )
1740                                         ret = ENOMEM;
1741 #if defined(EAI_SYSTEM)
1742                                 else if (ret == EAI_SYSTEM)
1743                                         ret = errno;
1744 #endif
1745                                 else
1746                                         ret = EINVAL;
1747                         }
1748                         break;
1749
1750                 case PING_INFO_FAMILY:
1751                         ret = ENOMEM;
1752                         *buffer_len = sizeof (int);
1753                         if (orig_buffer_len < sizeof (int))
1754                                 break;
1755                         *((int *) buffer) = iter->addrfamily;
1756                         ret = 0;
1757                         break;
1758
1759                 case PING_INFO_LATENCY:
1760                         ret = ENOMEM;
1761                         *buffer_len = sizeof (double);
1762                         if (orig_buffer_len < sizeof (double))
1763                                 break;
1764                         *((double *) buffer) = iter->latency;
1765                         ret = 0;
1766                         break;
1767
1768                 case PING_INFO_DROPPED:
1769                         ret = ENOMEM;
1770                         *buffer_len = sizeof (uint32_t);
1771                         if (orig_buffer_len < sizeof (uint32_t))
1772                                 break;
1773                         *((uint32_t *) buffer) = iter->dropped;
1774                         ret = 0;
1775                         break;
1776
1777                 case PING_INFO_SEQUENCE:
1778                         ret = ENOMEM;
1779                         *buffer_len = sizeof (unsigned int);
1780                         if (orig_buffer_len < sizeof (unsigned int))
1781                                 break;
1782                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1783                         ret = 0;
1784                         break;
1785
1786                 case PING_INFO_IDENT:
1787                         ret = ENOMEM;
1788                         *buffer_len = sizeof (uint16_t);
1789                         if (orig_buffer_len < sizeof (uint16_t))
1790                                 break;
1791                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1792                         ret = 0;
1793                         break;
1794
1795                 case PING_INFO_DATA:
1796                         ret = ENOMEM;
1797                         *buffer_len = strlen (iter->data);
1798                         if (orig_buffer_len < *buffer_len)
1799                                 break;
1800                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1801                         ret = 0;
1802                         break;
1803
1804                 case PING_INFO_RECV_TTL:
1805                         ret = ENOMEM;
1806                         *buffer_len = sizeof (int);
1807                         if (orig_buffer_len < sizeof (int))
1808                                 break;
1809                         *((int *) buffer) = iter->recv_ttl;
1810                         ret = 0;
1811                         break;
1812
1813                 case PING_INFO_RECV_QOS:
1814                         ret = ENOMEM;
1815                         if (*buffer_len>sizeof(unsigned)) *buffer_len=sizeof(unsigned);
1816                         if (!*buffer_len) *buffer_len=1;
1817                         if (orig_buffer_len < *buffer_len)
1818                                 break;
1819                         memcpy(buffer,&iter->recv_qos,*buffer_len);
1820                         ret = 0;
1821                         break;
1822         }
1823
1824         return (ret);
1825 } /* ping_iterator_get_info */
1826
1827 void *ping_iterator_get_context (pingobj_iter_t *iter)
1828 {
1829         if (iter == NULL)
1830                 return (NULL);
1831         return (iter->context);
1832 }
1833
1834 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1835 {
1836         if (iter == NULL)
1837                 return;
1838         iter->context = context;
1839 }