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 #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 #define PING_TABLE_LEN 5381
 104
 105 struct pinghost
 106 {
 107         /* username: name passed in by the user */
 108         char                    *username;
 109         /* hostname: name returned by the reverse lookup */
 110         char                    *hostname;
 111         struct sockaddr_storage *addr;
 112         socklen_t                addrlen;
 113         int                      addrfamily;
 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         struct pinghost         *table_next;
 127 };
 128
 129 struct pingobj
 130 {
 131         double                   timeout;
 132         int                      ttl;
 133         int                      addrfamily;
 134         uint8_t                  qos;
 135         char                    *data;
 136
 137         int                      fd4;
 138         int                      fd6;
 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         pinghost_t              *table[PING_TABLE_LEN];
 149 };
 150
 151 /*
 152  * private (static) functions
 153  */
 154 /* Even though Posix requires "strerror_r" to return an "int",
 155  * some systems (e.g. the GNU libc) return a "char *" _and_
 156  * ignore the second argument ... -tokkee */
 157 static char *sstrerror (int errnum, char *buf, size_t buflen)
 158 {
 159         buf[0] = 0;
 160
 161 #if !HAVE_STRERROR_R
 162         {
 163                 snprintf (buf, buflen, "Error %i (%#x)", errnum, errnum);
 164         }
 165 /* #endif !HAVE_STRERROR_R */
 166
 167 #elif STRERROR_R_CHAR_P
 168         {
 169                 char *temp;
 170                 temp = strerror_r (errnum, buf, buflen);
 171                 if (buf[0] == 0)
 172                 {
 173                         if ((temp != NULL) && (temp != buf) && (temp[0] != 0))
 174                                 strncpy (buf, temp, buflen);
 175                         else
 176                                 strncpy (buf, "strerror_r did not return "
 177                                                 "an error message", buflen);
 178                 }
 179         }
 180 /* #endif STRERROR_R_CHAR_P */
 181
 182 #else
 183         if (strerror_r (errnum, buf, buflen) != 0)
 184         {
 185                 snprintf (buf, buflen, "Error %i (%#x); "
 186                                 "Additionally, strerror_r failed.",
 187                                 errnum, errnum);
 188         }
 189 #endif /* STRERROR_R_CHAR_P */
 190
 191         buf[buflen - 1] = 0;
 192
 193         return (buf);
 194 } /* char *sstrerror */
 195
 196 static void ping_set_error (pingobj_t *obj, const char *function,
 197                 const char *message)
 198 {
 199         snprintf (obj->errmsg, sizeof (obj->errmsg),
 200                         "%s: %s", function, message);
 201         obj->errmsg[sizeof (obj->errmsg) - 1] = 0;
 202 }
 203
 204 static void ping_set_errno (pingobj_t *obj, int error_number)
 205 {
 206         sstrerror (error_number, obj->errmsg, sizeof (obj->errmsg));
 207 }
 208
 209 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
 210                 struct timeval *res)
 211 {
 212         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
 213         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
 214
 215         while (res->tv_usec > 1000000)
 216         {
 217                 res->tv_usec -= 1000000;
 218                 res->tv_sec++;
 219         }
 220
 221         return (0);
 222 }
 223
 224 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
 225                 struct timeval *res)
 226 {
 227         if ((tv1->tv_sec < tv2->tv_sec)
 228                         || ((tv1->tv_sec == tv2->tv_sec)
 229                                 && (tv1->tv_usec < tv2->tv_usec)))
 230                 return (-1);
 231
 232         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
 233         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
 234
 235         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec >= 0)));
 236
 237         while (res->tv_usec < 0)
 238         {
 239                 res->tv_usec += 1000000;
 240                 res->tv_sec--;
 241         }
 242
 243         return (0);
 244 }
 245
 246 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
 247 {
 248         uint32_t sum = 0;
 249         uint16_t ret = 0;
 250
 251         uint16_t *ptr;
 252
 253         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
 254                 sum += *ptr;
 255
 256         if (len == 1)
 257         {
 258                 *(char *) &ret = *(char *) ptr;
 259                 sum += ret;
 260         }
 261
 262         /* Do this twice to get all possible carries.. */
 263         sum = (sum >> 16) + (sum & 0xFFFF);
 264         sum = (sum >> 16) + (sum & 0xFFFF);
 265
 266         ret = ~sum;
 267
 268         return (ret);
 269 }
 270
 271 static pinghost_t *ping_receive_ipv4 (pingobj_t *obj, char *buffer,
 272                 size_t buffer_len)
 273 {
 274         struct ip *ip_hdr;
 275         struct icmp *icmp_hdr;
 276
 277         size_t ip_hdr_len;
 278
 279         uint16_t recv_checksum;
 280         uint16_t calc_checksum;
 281
 282         uint16_t ident;
 283         uint16_t seq;
 284
 285         pinghost_t *ptr;
 286
 287         if (buffer_len < sizeof (struct ip))
 288                 return (NULL);
 289
 290         ip_hdr     = (struct ip *) buffer;
 291         ip_hdr_len = ip_hdr->ip_hl << 2;
 292
 293         if (buffer_len < ip_hdr_len)
 294                 return (NULL);
 295
 296         buffer     += ip_hdr_len;
 297         buffer_len -= ip_hdr_len;
 298
 299         if (buffer_len < sizeof (struct icmp))
 300                 return (NULL);
 301
 302         icmp_hdr = (struct icmp *) buffer;
 303         buffer     += sizeof (struct icmp);
 304         buffer_len -= sizeof (struct icmp);
 305
 306         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
 307         {
 308                 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
 309                 return (NULL);
 310         }
 311
 312         recv_checksum = icmp_hdr->icmp_cksum;
 313         icmp_hdr->icmp_cksum = 0;
 314         calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
 315                         sizeof (struct icmp) + buffer_len);
 316
 317         if (recv_checksum != calc_checksum)
 318         {
 319                 dprintf ("Checksum missmatch: Got 0x%04"PRIx16", "
 320                                 "calculated 0x%04"PRIx16"\n",
 321                                 recv_checksum, calc_checksum);
 322                 return (NULL);
 323         }
 324
 325         ident = ntohs (icmp_hdr->icmp_id);
 326         seq   = ntohs (icmp_hdr->icmp_seq);
 327
 328         for (ptr = obj->table[ident % PING_TABLE_LEN];
 329                         ptr != NULL; ptr = ptr->table_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, struct timeval *now, int addrfam)
 451 {
 452         int fd = addrfam == AF_INET6 ? obj->fd6 : obj->fd4;
 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 (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, 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                 if (cmsg->cmsg_level == SOL_SOCKET)
 508                 {
 509 #ifdef SO_TIMESTAMP
 510                         if (cmsg->cmsg_type == SO_TIMESTAMP)
 511                                 memcpy (&pkt_now, CMSG_DATA (cmsg), sizeof (pkt_now));
 512 #endif /* SO_TIMESTAMP */
 513                 }
 514                 else if (addrfam == AF_INET) /* {{{ */
 515                 {
 516                         if (cmsg->cmsg_level != IPPROTO_IP)
 517                                 continue;
 518
 519                         if (cmsg->cmsg_type == IP_TOS)
 520                         {
 521                                 memcpy (&recv_qos, CMSG_DATA (cmsg),
 522                                                 sizeof (recv_qos));
 523                                 dprintf ("TOSv4 = 0x%02"PRIx8";\n", recv_qos);
 524                         } else
 525                         if (cmsg->cmsg_type == IP_TTL)
 526                         {
 527                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 528                                                 sizeof (recv_ttl));
 529                                 dprintf ("TTLv4 = %i;\n", recv_ttl);
 530                         }
 531                         else
 532                         {
 533                                 dprintf ("Not handling option %i.\n",
 534                                                 cmsg->cmsg_type);
 535                         }
 536                 } /* }}} */
 537                 else if (addrfam == AF_INET6) /* {{{ */
 538                 {
 539                         if (cmsg->cmsg_level != IPPROTO_IPV6)
 540                                 continue;
 541
 542                         if (cmsg->cmsg_type == IPV6_TCLASS)
 543                         {
 544                                 memcpy (&recv_qos, CMSG_DATA (cmsg),
 545                                                 sizeof (recv_qos));
 546                                 dprintf ("TOSv6 = 0x%02"PRIx8";\n", recv_qos);
 547                         } else
 548                         if (cmsg->cmsg_type == IPV6_HOPLIMIT)
 549                         {
 550                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 551                                                 sizeof (recv_ttl));
 552                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 553                         }
 554                         else
 555                         {
 556                                 dprintf ("Not handling option %i.\n",
 557                                                 cmsg->cmsg_type);
 558                         }
 559                 } /* }}} */
 560                 else
 561                 {
 562                         dprintf ("Don't know how to handle "
 563                                         "unknown protocol %i.\n",
 564                                         cmsg->cmsg_level);
 565                 }
 566         } /* }}} for (cmsg) */
 567
 568         if (addrfam == AF_INET)
 569         {
 570                 host = ping_receive_ipv4 (obj, payload_buffer, payload_buffer_len);
 571                 if (host == NULL)
 572                         return (-1);
 573         }
 574         else if (addrfam == AF_INET6)
 575         {
 576                 host = ping_receive_ipv6 (obj, payload_buffer, payload_buffer_len);
 577                 if (host == NULL)
 578                         return (-1);
 579         }
 580         else
 581         {
 582                 dprintf ("ping_receive_one: Unknown address family %i.\n",
 583                                 addrfam);
 584                 return (-1);
 585         }
 586
 587         dprintf ("rcvd: %12i.%06i\n",
 588                         (int) pkt_now.tv_sec,
 589                         (int) pkt_now.tv_usec);
 590         dprintf ("sent: %12i.%06i\n",
 591                         (int) host->timer->tv_sec,
 592                         (int) host->timer->tv_usec);
 593
 594         if (ping_timeval_sub (&pkt_now, host->timer, &diff) < 0)
 595         {
 596                 timerclear (host->timer);
 597                 return (-1);
 598         }
 599
 600         dprintf ("diff: %12i.%06i\n",
 601                         (int) diff.tv_sec,
 602                         (int) diff.tv_usec);
 603
 604         if (recv_ttl >= 0)
 605                 host->recv_ttl = recv_ttl;
 606         host->recv_qos = recv_qos;
 607
 608         host->latency  = ((double) diff.tv_usec) / 1000.0;
 609         host->latency += ((double) diff.tv_sec)  * 1000.0;
 610
 611         timerclear (host->timer);
 612
 613         return (0);
 614 }
 615
 616 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 617  * Sending functions:                                                        *
 618  *                                                                           *
 619  * ping_send_all                                                             *
 620  * +-> ping_send_one_ipv4                                                    *
 621  * `-> ping_send_one_ipv6                                                    *
 622  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 623 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 624                 const void *buf, size_t buflen, int fd)
 625 {
 626         ssize_t ret;
 627
 628         if (gettimeofday (ph->timer, NULL) == -1)
 629         {
 630                 timerclear (ph->timer);
 631                 return (-1);
 632         }
 633
 634         ret = sendto (fd, buf, buflen, 0,
 635                         (struct sockaddr *) ph->addr, ph->addrlen);
 636
 637         if (ret < 0)
 638         {
 639 #if defined(EHOSTUNREACH)
 640                 if (errno == EHOSTUNREACH)
 641                         return (0);
 642 #endif
 643 #if defined(ENETUNREACH)
 644                 if (errno == ENETUNREACH)
 645                         return (0);
 646 #endif
 647                 ping_set_errno (obj, errno);
 648         }
 649
 650         return (ret);
 651 }
 652
 653 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph, int fd)
 654 {
 655         struct icmp *icmp4;
 656         int status;
 657
 658         char buf[4096];
 659         int  buflen;
 660
 661         char *data;
 662         int   datalen;
 663
 664         dprintf ("ph->hostname = %s\n", ph->hostname);
 665
 666         memset (buf, '\0', sizeof (buf));
 667         icmp4 = (struct icmp *) buf;
 668         data  = (char *) (icmp4 + 1);
 669
 670         icmp4->icmp_type  = ICMP_ECHO;
 671         icmp4->icmp_code  = 0;
 672         icmp4->icmp_cksum = 0;
 673         icmp4->icmp_id    = htons (ph->ident);
 674         icmp4->icmp_seq   = htons (ph->sequence);
 675
 676         buflen = 4096 - sizeof (struct icmp);
 677         strncpy (data, ph->data, buflen);
 678         datalen = strlen (data);
 679
 680         buflen = datalen + sizeof (struct icmp);
 681
 682         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 683
 684         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 685
 686         status = ping_sendto (obj, ph, buf, buflen, fd);
 687         if (status < 0)
 688         {
 689                 perror ("ping_sendto");
 690                 return (-1);
 691         }
 692
 693         dprintf ("sendto: status = %i\n", status);
 694
 695         return (0);
 696 }
 697
 698 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph, int fd)
 699 {
 700         struct icmp6_hdr *icmp6;
 701         int status;
 702
 703         char buf[4096];
 704         int  buflen;
 705
 706         char *data;
 707         int   datalen;
 708
 709         dprintf ("ph->hostname = %s\n", ph->hostname);
 710
 711         memset (buf, '\0', sizeof (buf));
 712         icmp6 = (struct icmp6_hdr *) buf;
 713         data  = (char *) (icmp6 + 1);
 714
 715         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 716         icmp6->icmp6_code  = 0;
 717         /* The checksum will be calculated by the TCP/IP stack.  */
 718         /* FIXME */
 719         icmp6->icmp6_cksum = 0;
 720         icmp6->icmp6_id    = htons (ph->ident);
 721         icmp6->icmp6_seq   = htons (ph->sequence);
 722
 723         buflen = 4096 - sizeof (struct icmp6_hdr);
 724         strncpy (data, ph->data, buflen);
 725         datalen = strlen (data);
 726
 727         buflen = datalen + sizeof (struct icmp6_hdr);
 728
 729         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 730
 731         status = ping_sendto (obj, ph, buf, buflen, fd);
 732         if (status < 0)
 733         {
 734                 perror ("ping_sendto");
 735                 return (-1);
 736         }
 737
 738         dprintf ("sendto: status = %i\n", status);
 739
 740         return (0);
 741 }
 742
 743 static int ping_send_one (pingobj_t *obj, pinghost_t *ptr, int fd)
 744 {
 745         if (gettimeofday (ptr->timer, NULL) == -1)
 746         {
 747                 /* start timer.. The GNU `ping6' starts the timer before
 748                  * sending the packet, so I will do that too */
 749 #if WITH_DEBUG
 750                 char errbuf[PING_ERRMSG_LEN];
 751                 dprintf ("gettimeofday: %s\n",
 752                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 753 #endif
 754                 timerclear (ptr->timer);
 755                 return (-1);
 756         }
 757         else
 758         {
 759                 dprintf ("timer set for hostname = %s\n", ptr->hostname);
 760         }
 761
 762         if (ptr->addrfamily == AF_INET6)
 763         {
 764                 dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 765                 if (ping_send_one_ipv6 (obj, ptr, fd) != 0)
 766                 {
 767                         timerclear (ptr->timer);
 768                         return (-1);
 769                 }
 770         }
 771         else if (ptr->addrfamily == AF_INET)
 772         {
 773                 dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 774                 if (ping_send_one_ipv4 (obj, ptr, fd) != 0)
 775                 {
 776                         timerclear (ptr->timer);
 777                         return (-1);
 778                 }
 779         }
 780         else /* this should not happen */
 781         {
 782                 dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 783                 timerclear (ptr->timer);
 784                 return (-1);
 785         }
 786
 787         ptr->sequence++;
 788
 789         return (0);
 790 }
 791
 792 /*
 793  * Set the TTL of a socket protocol independently.
 794  */
 795 static int ping_set_ttl (pingobj_t *obj, int ttl)
 796 {
 797         int ret = 0;
 798         char errbuf[PING_ERRMSG_LEN];
 799
 800         if (obj->fd4 != -1)
 801         {
 802                 if (setsockopt (obj->fd4, IPPROTO_IP, IP_TTL,
 803                                 &ttl, sizeof (ttl)))
 804                 {
 805                         ret = errno;
 806                         ping_set_error (obj, "ping_set_ttl",
 807                                         sstrerror (ret, errbuf, sizeof (errbuf)));
 808                         dprintf ("Setting TTLv4 failed: %s\n", errbuf);
 809                 }
 810         }
 811
 812         if (obj->fd6 != -1)
 813         {
 814                 dprintf ("Setting TTLv6 to %i\n", ttl);
 815                 if (setsockopt (obj->fd6, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
 816                                 &ttl, sizeof (ttl)))
 817                 {
 818                         ret = errno;
 819                         ping_set_error (obj, "ping_set_ttl",
 820                                         sstrerror (ret, errbuf, sizeof (errbuf)));
 821                         dprintf ("Setting TTLv6 failed: %s\n", errbuf);
 822                 }
 823         }
 824
 825         return (ret);
 826 }
 827
 828 /*
 829  * Set the TOS of a socket protocol independently.
 830  *
 831  * Using SOL_SOCKET / SO_PRIORITY might be a protocol independent way to
 832  * set this. See socket(7) for details.
 833  */
 834 static int ping_set_qos (pingobj_t *obj, uint8_t qos)
 835 {
 836         int ret = 0;
 837         char errbuf[PING_ERRMSG_LEN];
 838
 839         if (obj->fd4 != -1)
 840         {
 841                 dprintf ("Setting TP_TOS to %#04"PRIx8"\n", qos);
 842                 if (setsockopt (obj->fd4, IPPROTO_IP, IP_TOS,
 843                                 &qos, sizeof (qos)))
 844                 {
 845                         ret = errno;
 846                         ping_set_error (obj, "ping_set_qos",
 847                                         sstrerror (ret, errbuf, sizeof (errbuf)));
 848                         dprintf ("Setting TP_TOS failed: %s\n", errbuf);
 849                 }
 850         }
 851
 852         if (obj->fd6 != -1)
 853         {
 854                 /* IPV6_TCLASS requires an "int". */
 855                 int tmp = (int) qos;
 856
 857                 dprintf ("Setting IPV6_TCLASS to %#04"PRIx8" (%i)\n", qos, tmp);
 858                 if (setsockopt (obj->fd6, IPPROTO_IPV6, IPV6_TCLASS,
 859                         &tmp, sizeof (tmp)))
 860                 {
 861                         ret = errno;
 862                         ping_set_error (obj, "ping_set_qos",
 863                                         sstrerror (ret, errbuf, sizeof (errbuf)));
 864                         dprintf ("Setting IPV6_TCLASS failed: %s\n", errbuf);
 865                 }
 866         }
 867
 868         return (ret);
 869 }
 870
 871 static int ping_get_ident (void)
 872 {
 873         int fd;
 874         static int did_seed = 0;
 875
 876         int retval;
 877
 878         if (did_seed == 0)
 879         {
 880                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 881                 {
 882                         unsigned int seed;
 883
 884                         if (read (fd, &seed, sizeof (seed)) != -1)
 885                         {
 886                                 did_seed = 1;
 887                                 dprintf ("Random seed:   %#x\n", seed);
 888                                 srandom (seed);
 889                         }
 890
 891                         close (fd);
 892                 }
 893 #if WITH_DEBUG
 894                 else
 895                 {
 896                         char errbuf[PING_ERRMSG_LEN];
 897                         dprintf ("open (/dev/urandom): %s\n",
 898                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 899                 }
 900 #endif
 901         }
 902
 903         retval = (int) random ();
 904
 905         dprintf ("Random number: %#x\n", retval);
 906
 907         return (retval);
 908 }
 909
 910 static pinghost_t *ping_alloc (void)
 911 {
 912         pinghost_t *ph;
 913         size_t      ph_size;
 914
 915         ph_size = sizeof (pinghost_t)
 916                 + sizeof (struct sockaddr_storage)
 917                 + sizeof (struct timeval);
 918
 919         ph = (pinghost_t *) malloc (ph_size);
 920         if (ph == NULL)
 921                 return (NULL);
 922
 923         memset (ph, '\0', ph_size);
 924
 925         ph->timer   = (struct timeval *) (ph + 1);
 926         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
 927
 928         ph->addrlen = sizeof (struct sockaddr_storage);
 929         ph->latency = -1.0;
 930         ph->dropped = 0;
 931         ph->ident   = ping_get_ident () & 0xFFFF;
 932
 933         return (ph);
 934 }
 935
 936 static void ping_free (pinghost_t *ph)
 937 {
 938         if (ph->username != NULL)
 939                 free (ph->username);
 940
 941         if (ph->hostname != NULL)
 942                 free (ph->hostname);
 943
 944         if (ph->data != NULL)
 945                 free (ph->data);
 946
 947         free (ph);
 948 }
 949
 950 static int ping_open_socket(pingobj_t *obj, int addrfam)
 951 {
 952         int fd;
 953         if (addrfam == AF_INET6)
 954         {
 955                 fd = socket(addrfam, SOCK_RAW, IPPROTO_ICMPV6);
 956         }
 957         else if (addrfam == AF_INET)
 958         {
 959                 fd = socket(addrfam, SOCK_RAW, IPPROTO_ICMP);
 960         }
 961         else /* this should not happen */
 962         {
 963                 dprintf ("Unknown address family: %i\n", addrfam);
 964                 return (-1);
 965         }
 966
 967         if (fd == -1)
 968         {
 969 #if WITH_DEBUG
 970                 char errbuf[PING_ERRMSG_LEN];
 971                 dprintf ("socket: %s\n",
 972                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 973 #endif
 974                 ping_set_errno (obj, errno);
 975                 return -1;
 976         }
 977
 978         if (obj->srcaddr != NULL)
 979         {
 980                 assert (obj->srcaddrlen > 0);
 981                 assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
 982
 983                 if (bind (fd, obj->srcaddr, obj->srcaddrlen) == -1)
 984                 {
 985 #if WITH_DEBUG
 986                         char errbuf[PING_ERRMSG_LEN];
 987                         dprintf ("bind: %s\n",
 988                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 989 #endif
 990                         ping_set_errno (obj, errno);
 991                         close (fd);
 992                         return -1;
 993                 }
 994         }
 995
 996 #ifdef SO_BINDTODEVICE
 997         if (obj->device != NULL)
 998         {
 999                 if (setsockopt (fd, SOL_SOCKET, SO_BINDTODEVICE,
1000                                 obj->device, strlen (obj->device) + 1) != 0)
1001                 {
1002 #if WITH_DEBUG
1003                         char errbuf[PING_ERRMSG_LEN];
1004                         dprintf ("setsockopt (SO_BINDTODEVICE): %s\n",
1005                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1006 #endif
1007                         ping_set_errno (obj, errno);
1008                         close (fd);
1009                         return -1;
1010                 }
1011         }
1012 #endif /* SO_BINDTODEVICE */
1013 #ifdef SO_TIMESTAMP
1014         if (1) /* {{{ */
1015         {
1016                 int status;
1017                 int opt = 1;
1018
1019                 status = setsockopt (fd,
1020                                 SOL_SOCKET, SO_TIMESTAMP,
1021                                 &opt, sizeof (opt));
1022                 if (status != 0)
1023                 {
1024 #if WITH_DEBUG
1025                         char errbuf[PING_ERRMSG_LEN];
1026                         dprintf ("setsockopt (SO_TIMESTAMP): %s\n",
1027                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1028 #endif
1029                         ping_set_errno (obj, errno);
1030                         close (fd);
1031                         return -1;
1032                 }
1033         } /* }}} if (1) */
1034 #endif /* SO_TIMESTAMP */
1035
1036         if (addrfam == AF_INET)
1037         {
1038                 int opt;
1039
1040                 /* Enable receiving the TOS field */
1041                 opt = 1;
1042                 setsockopt (fd, IPPROTO_IP, IP_RECVTOS,
1043                                 &opt, sizeof (opt));
1044
1045                 /* Enable receiving the TTL field */
1046                 opt = 1;
1047                 setsockopt (fd, IPPROTO_IP, IP_RECVTTL,
1048                                 &opt, sizeof (opt));
1049         }
1050 #if defined(IPV6_RECVHOPLIMIT) || defined(IPV6_RECVTCLASS)
1051         else if (addrfam == AF_INET6)
1052         {
1053                 int opt;
1054
1055 # if defined(IPV6_RECVHOPLIMIT)
1056                 /* For details see RFC 3542, section 6.3. */
1057                 opt = 1;
1058                 setsockopt (fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1059                                 &opt, sizeof (opt));
1060 # endif /* IPV6_RECVHOPLIMIT */
1061
1062 # if defined(IPV6_RECVTCLASS)
1063                 /* For details see RFC 3542, section 6.5. */
1064                 opt = 1;
1065                 setsockopt (fd, IPPROTO_IPV6, IPV6_RECVTCLASS,
1066                                 &opt, sizeof (opt));
1067 # endif /* IPV6_RECVTCLASS */
1068         }
1069 #endif /* IPV6_RECVHOPLIMIT || IPV6_RECVTCLASS */
1070
1071         return fd;
1072 }
1073
1074 /*
1075  * public methods
1076  */
1077 const char *ping_get_error (pingobj_t *obj)
1078 {
1079         if (obj == NULL)
1080                 return (NULL);
1081         return (obj->errmsg);
1082 }
1083
1084 pingobj_t *ping_construct (void)
1085 {
1086         pingobj_t *obj;
1087
1088         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
1089                 return (NULL);
1090         memset (obj, 0, sizeof (pingobj_t));
1091
1092         obj->timeout    = PING_DEF_TIMEOUT;
1093         obj->ttl        = PING_DEF_TTL;
1094         obj->addrfamily = PING_DEF_AF;
1095         obj->data       = strdup (PING_DEF_DATA);
1096         obj->qos        = 0;
1097         obj->fd4        = -1;
1098         obj->fd6        = -1;
1099
1100         return (obj);
1101 }
1102
1103 void ping_destroy (pingobj_t *obj)
1104 {
1105         pinghost_t *current;
1106         pinghost_t *next;
1107
1108         if (obj == NULL)
1109                 return;
1110
1111         current = obj->head;
1112         next = NULL;
1113
1114         while (current != NULL)
1115         {
1116                 next = current->next;
1117                 ping_free (current);
1118                 current = next;
1119         }
1120
1121         if (obj->data != NULL)
1122                 free (obj->data);
1123
1124         if (obj->srcaddr != NULL)
1125                 free (obj->srcaddr);
1126
1127         if (obj->device != NULL)
1128                 free (obj->device);
1129
1130         if (obj->fd4 != -1)
1131                 close(obj->fd4);
1132
1133         if (obj->fd6 != -1)
1134                 close(obj->fd6);
1135
1136         free (obj);
1137
1138         return;
1139 }
1140
1141 int ping_setopt (pingobj_t *obj, int option, void *value)
1142 {
1143         int ret = 0;
1144
1145         if ((obj == NULL) || (value == NULL))
1146                 return (-1);
1147
1148         switch (option)
1149         {
1150                 case PING_OPT_QOS:
1151                 {
1152                         obj->qos = *((uint8_t *) value);
1153                         ret = ping_set_qos (obj, obj->qos);
1154                         break;
1155                 }
1156
1157                 case PING_OPT_TIMEOUT:
1158                         obj->timeout = *((double *) value);
1159                         if (obj->timeout < 0.0)
1160                         {
1161                                 obj->timeout = PING_DEF_TIMEOUT;
1162                                 ret = -1;
1163                         }
1164                         break;
1165
1166                 case PING_OPT_TTL:
1167                         ret = *((int *) value);
1168                         if ((ret < 1) || (ret > 255))
1169                         {
1170                                 obj->ttl = PING_DEF_TTL;
1171                                 ret = -1;
1172                         }
1173                         else
1174                         {
1175                                 obj->ttl = ret;
1176                                 ret = ping_set_ttl (obj, obj->ttl);
1177                         }
1178                         break;
1179
1180                 case PING_OPT_AF:
1181                         obj->addrfamily = *((int *) value);
1182                         if ((obj->addrfamily != AF_UNSPEC)
1183                                         && (obj->addrfamily != AF_INET)
1184                                         && (obj->addrfamily != AF_INET6))
1185                         {
1186                                 obj->addrfamily = PING_DEF_AF;
1187                                 ret = -1;
1188                         }
1189                         if (obj->srcaddr != NULL)
1190                         {
1191                                 free (obj->srcaddr);
1192                                 obj->srcaddr = NULL;
1193                         }
1194                         break;
1195
1196                 case PING_OPT_DATA:
1197                         if (obj->data != NULL)
1198                         {
1199                                 free (obj->data);
1200                                 obj->data = NULL;
1201                         }
1202                         obj->data = strdup ((const char *) value);
1203                         break;
1204
1205                 case PING_OPT_SOURCE:
1206                 {
1207                         char            *hostname = (char *) value;
1208                         struct addrinfo  ai_hints;
1209                         struct addrinfo *ai_list;
1210                         int              status;
1211 #if WITH_DEBUG
1212                         if (obj->addrfamily != AF_UNSPEC)
1213                         {
1214                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1215                         }
1216 #endif
1217                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1218                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1219 #if defined(AI_ADDRCONFIG)
1220                         ai_hints.ai_flags = AI_ADDRCONFIG;
1221 #endif
1222                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1223                         if (status != 0)
1224                         {
1225 #if defined(EAI_SYSTEM)
1226                                 char errbuf[PING_ERRMSG_LEN];
1227 #endif
1228                                 ping_set_error (obj, "getaddrinfo",
1229 #if defined(EAI_SYSTEM)
1230                                                 (status == EAI_SYSTEM)
1231                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1232 #endif
1233                                                 gai_strerror (status));
1234                                 ret = -1;
1235                                 break;
1236                         }
1237 #if WITH_DEBUG
1238                         if (ai_list->ai_next != NULL)
1239                         {
1240                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1241                         }
1242 #endif
1243                         if (obj->srcaddr == NULL)
1244                         {
1245                                 obj->srcaddrlen = 0;
1246                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1247                                 if (obj->srcaddr == NULL)
1248                                 {
1249                                         ping_set_errno (obj, errno);
1250                                         ret = -1;
1251                                         freeaddrinfo (ai_list);
1252                                         break;
1253                                 }
1254                         }
1255                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1256                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1257                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1258                                         ai_list->ai_addrlen);
1259                         obj->srcaddrlen = ai_list->ai_addrlen;
1260                         obj->addrfamily = ai_list->ai_family;
1261
1262                         freeaddrinfo (ai_list);
1263                 } /* case PING_OPT_SOURCE */
1264                 break;
1265
1266                 case PING_OPT_DEVICE:
1267                 {
1268 #ifdef SO_BINDTODEVICE
1269                         char *device = strdup ((char *) value);
1270
1271                         if (device == NULL)
1272                         {
1273                                 ping_set_errno (obj, errno);
1274                                 ret = -1;
1275                                 break;
1276                         }
1277
1278                         if (obj->device != NULL)
1279                                 free (obj->device);
1280                         obj->device = device;
1281 #else /* ! SO_BINDTODEVICE */
1282                         ping_set_errno (obj, ENOTSUP);
1283                         ret = -1;
1284 #endif /* ! SO_BINDTODEVICE */
1285                 } /* case PING_OPT_DEVICE */
1286                 break;
1287
1288                 default:
1289                         ret = -2;
1290         } /* switch (option) */
1291
1292         return (ret);
1293 } /* int ping_setopt */
1294
1295 int ping_send (pingobj_t *obj)
1296 {
1297         fd_set read_fds;
1298         fd_set write_fds;
1299         fd_set err_fds;
1300
1301         int num_fds;
1302         int max_fd;
1303
1304         pinghost_t *ph;
1305         pinghost_t *ptr;
1306
1307         struct timeval endtime;
1308         struct timeval nowtime;
1309         struct timeval timeout;
1310         int status;
1311
1312         int pings = 0;
1313         int ret = 0;
1314
1315         ph = obj->head;
1316
1317         int fd4 = obj->fd4;
1318         int fd6 = obj->fd6;
1319
1320         for (ptr = ph; ptr != NULL; ptr = ptr->next)
1321         {
1322                 if (fd6 == -1 && ptr->addrfamily == AF_INET6)
1323                 {
1324                         obj->fd6 = fd6 = ping_open_socket(obj, AF_INET6);
1325                         ping_set_ttl (obj, obj->ttl);
1326                         ping_set_qos (obj, obj->qos);
1327                 }
1328                 else if (fd4 == -1 && ptr->addrfamily == AF_INET)
1329                 {
1330                         obj->fd4 = fd4 = ping_open_socket(obj, AF_INET);
1331                         ping_set_ttl (obj, obj->ttl);
1332                         ping_set_qos (obj, obj->qos);
1333                 }
1334
1335                 if ((fd6 == -1 && ptr->addrfamily == AF_INET6)
1336                         || (fd4 == -1 && ptr->addrfamily == AF_INET))
1337                 {
1338 #if WITH_DEBUG
1339                         char errbuf[PING_ERRMSG_LEN];
1340                         dprintf ("socket: %s\n",
1341                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1342 #endif
1343                         ping_set_errno (obj, errno);
1344                         return (-1);
1345                 }
1346
1347                 ptr->latency  = -1.0;
1348                 ptr->recv_ttl = -1;
1349         }
1350
1351         if (fd4 == -1 && fd6 == -1)
1352         {
1353                 dprintf("No sockets to use\n");
1354                 return (-1);
1355         }
1356
1357         if (gettimeofday (&nowtime, NULL) == -1)
1358         {
1359                 ping_set_errno (obj, errno);
1360                 return (-1);
1361         }
1362
1363         /* Set up timeout */
1364         timeout.tv_sec = (time_t) obj->timeout;
1365         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
1366
1367         dprintf ("Set timeout to %i.%06i seconds\n",
1368                         (int) timeout.tv_sec,
1369                         (int) timeout.tv_usec);
1370
1371         ping_timeval_add (&nowtime, &timeout, &endtime);
1372
1373         ptr = ph;
1374         num_fds = 0;
1375         if (fd4 != -1) num_fds++;
1376         if (fd6 != -1) num_fds++;
1377         max_fd = fd4 > fd6 ? fd4 : fd6;
1378
1379         while (pings > 0 || ptr != NULL)
1380         {
1381                 FD_ZERO (&read_fds);
1382                 FD_ZERO (&write_fds);
1383                 FD_ZERO (&err_fds);
1384
1385                 if (fd4 != -1) FD_SET(fd4, &read_fds);
1386                 if (fd6 != -1) FD_SET(fd6, &read_fds);
1387
1388                 if (fd4 != -1 && ptr != NULL && ptr->addrfamily == AF_INET)
1389                         FD_SET(fd4, &write_fds);
1390                 if (fd6 != -1 && ptr != NULL && ptr->addrfamily == AF_INET6)
1391                         FD_SET(fd6, &write_fds);
1392                 if (fd4 != -1) FD_SET(fd4, &err_fds);
1393                 if (fd6 != -1) FD_SET(fd6, &err_fds);
1394
1395                 if (gettimeofday (&nowtime, NULL) == -1)
1396                 {
1397                         ping_set_errno (obj, errno);
1398                         return (-1);
1399                 }
1400
1401                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
1402                         break;
1403
1404                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_fds,
1405                                 (int) timeout.tv_sec,
1406                                 (int) timeout.tv_usec);
1407
1408                 status = select (max_fd + 1, &read_fds, &write_fds, &err_fds, &timeout);
1409
1410                 if (gettimeofday (&nowtime, NULL) == -1)
1411                 {
1412                         ping_set_errno (obj, errno);
1413                         return (-1);
1414                 }
1415
1416                 if ((status == -1) && (errno == EINTR))
1417                 {
1418                         dprintf ("select was interrupted by signal..\n");
1419                         continue;
1420                 }
1421                 else if (status < 0)
1422                 {
1423 #if WITH_DEBUG
1424                         char errbuf[PING_ERRMSG_LEN];
1425                         dprintf ("select: %s\n",
1426                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1427 #endif
1428                         break;
1429                 }
1430                 else if (status == 0)
1431                 {
1432                         dprintf ("select timed out\n");
1433                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
1434                                 if (ptr->latency < 0.0)
1435                                         ptr->dropped++;
1436
1437                         break;
1438                 }
1439
1440                 if (fd4 != -1)
1441                 {
1442                         if (FD_ISSET (fd4, &read_fds))
1443                         {
1444                                 if (!ping_receive_one(obj, &nowtime, AF_INET))
1445                                         --pings;
1446                         }
1447                         else if (ptr != NULL && ptr->addrfamily == AF_INET &&
1448                                                 FD_ISSET (fd4, &write_fds))
1449                         {
1450                                 if (!ping_send_one(obj, ptr, fd4))
1451                                 {
1452                                         ptr = ptr->next;
1453                                         ++pings;
1454                                 }
1455                                 else
1456                                 {
1457                                         --ret;
1458                                 }
1459                         }
1460
1461                 }
1462
1463                 if (fd6  != -1)
1464                 {
1465                         if (FD_ISSET (fd6, &read_fds))
1466                         {
1467                                 if (!ping_receive_one(obj, &nowtime, AF_INET6))
1468                                         --pings;
1469                         }
1470                         else if (ptr != NULL && ptr->addrfamily == AF_INET6 &&
1471                                                 FD_ISSET (fd6, &write_fds))
1472                         {
1473                                 if (!ping_send_one(obj, ptr, fd6))
1474                                 {
1475                                         ++pings;
1476                                         ptr = ptr->next;
1477                                 }
1478                                 else
1479                                 {
1480                                         --ret;
1481                                 }
1482                         }
1483                 }
1484
1485         } /* while (1) */
1486
1487         return (ret);
1488 } /* int ping_send */
1489
1490 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1491 {
1492         while (ph != NULL)
1493         {
1494                 if (strcasecmp (ph->username, host) == 0)
1495                         break;
1496
1497                 ph = ph->next;
1498         }
1499
1500         return (ph);
1501 }
1502
1503 int ping_host_add (pingobj_t *obj, const char *host)
1504 {
1505         pinghost_t *ph;
1506
1507         struct addrinfo  ai_hints;
1508         struct addrinfo *ai_list, *ai_ptr;
1509         int              ai_return;
1510
1511         if ((obj == NULL) || (host == NULL))
1512                 return (-1);
1513
1514         dprintf ("host = %s\n", host);
1515
1516         if (ping_host_search (obj->head, host) != NULL)
1517                 return (0);
1518
1519         memset (&ai_hints, '\0', sizeof (ai_hints));
1520         ai_hints.ai_flags     = 0;
1521 #ifdef AI_ADDRCONFIG
1522         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1523 #endif
1524 #ifdef AI_CANONNAME
1525         ai_hints.ai_flags    |= AI_CANONNAME;
1526 #endif
1527         ai_hints.ai_family    = obj->addrfamily;
1528         ai_hints.ai_socktype  = SOCK_RAW;
1529
1530         if ((ph = ping_alloc ()) == NULL)
1531         {
1532                 dprintf ("Out of memory!\n");
1533                 return (-1);
1534         }
1535
1536         if ((ph->username = strdup (host)) == NULL)
1537         {
1538                 dprintf ("Out of memory!\n");
1539                 ping_set_errno (obj, errno);
1540                 ping_free (ph);
1541                 return (-1);
1542         }
1543
1544         if ((ph->hostname = strdup (host)) == NULL)
1545         {
1546                 dprintf ("Out of memory!\n");
1547                 ping_set_errno (obj, errno);
1548                 ping_free (ph);
1549                 return (-1);
1550         }
1551
1552         /* obj->data is not garuanteed to be != NULL */
1553         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1554         {
1555                 dprintf ("Out of memory!\n");
1556                 ping_set_errno (obj, errno);
1557                 ping_free (ph);
1558                 return (-1);
1559         }
1560
1561         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1562         {
1563 #if defined(EAI_SYSTEM)
1564                 char errbuf[PING_ERRMSG_LEN];
1565 #endif
1566                 dprintf ("getaddrinfo failed\n");
1567                 ping_set_error (obj, "getaddrinfo",
1568 #if defined(EAI_SYSTEM)
1569                                                 (ai_return == EAI_SYSTEM)
1570                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1571 #endif
1572                                 gai_strerror (ai_return));
1573                 ping_free (ph);
1574                 return (-1);
1575         }
1576
1577         if (ai_list == NULL)
1578                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1579
1580         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1581         {
1582                 if (ai_ptr->ai_family == AF_INET)
1583                 {
1584                         ai_ptr->ai_socktype = SOCK_RAW;
1585                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1586                 }
1587                 else if (ai_ptr->ai_family == AF_INET6)
1588                 {
1589                         ai_ptr->ai_socktype = SOCK_RAW;
1590                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1591                 }
1592                 else
1593                 {
1594                         char errmsg[PING_ERRMSG_LEN];
1595
1596                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1597                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1598
1599                         dprintf ("%s", errmsg);
1600                         ping_set_error (obj, "getaddrinfo", errmsg);
1601                         continue;
1602                 }
1603
1604                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1605                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1606                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1607                 ph->addrlen = ai_ptr->ai_addrlen;
1608                 ph->addrfamily = ai_ptr->ai_family;
1609
1610 #ifdef AI_CANONNAME
1611                 if ((ai_ptr->ai_canonname != NULL)
1612                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1613                 {
1614                         char *old_hostname;
1615
1616                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1617                                         ph->hostname, ai_ptr->ai_canonname);
1618
1619                         old_hostname = ph->hostname;
1620                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1621                         {
1622                                 /* strdup failed, falling back to old hostname */
1623                                 ph->hostname = old_hostname;
1624                         }
1625                         else if (old_hostname != NULL)
1626                         {
1627                                 free (old_hostname);
1628                         }
1629                 }
1630 #endif /* AI_CANONNAME */
1631
1632         } /* for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next) */
1633
1634         freeaddrinfo (ai_list);
1635
1636         /*
1637          * Adding in the front is much easier, but then the iterator will
1638          * return the host that was added last as first host. That's just not
1639          * nice. -octo
1640          */
1641         if (obj->head == NULL)
1642         {
1643                 obj->head = ph;
1644         }
1645         else
1646         {
1647                 pinghost_t *hptr;
1648
1649                 hptr = obj->head;
1650                 while (hptr->next != NULL)
1651                         hptr = hptr->next;
1652
1653                 assert ((hptr != NULL) && (hptr->next == NULL));
1654                 hptr->next = ph;
1655         }
1656
1657         ph->table_next = obj->table[ph->ident % PING_TABLE_LEN];
1658         obj->table[ph->ident % PING_TABLE_LEN] = ph;
1659
1660         return (0);
1661 } /* int ping_host_add */
1662
1663 int ping_host_remove (pingobj_t *obj, const char *host)
1664 {
1665         pinghost_t *pre, *cur, *target;
1666
1667         if ((obj == NULL) || (host == NULL))
1668                 return (-1);
1669
1670         pre = NULL;
1671         cur = obj->head;
1672
1673         while (cur != NULL)
1674         {
1675                 if (strcasecmp (host, cur->username) == 0)
1676                         break;
1677
1678                 pre = cur;
1679                 cur = cur->next;
1680         }
1681
1682         if (cur == NULL)
1683         {
1684                 ping_set_error (obj, "ping_host_remove", "Host not found");
1685                 return (-1);
1686         }
1687
1688         if (pre == NULL)
1689                 obj->head = cur->next;
1690         else
1691                 pre->next = cur->next;
1692
1693         target = cur;
1694         pre = NULL;
1695
1696         cur = obj->table[target->ident % PING_TABLE_LEN];
1697
1698         while (cur != NULL)
1699         {
1700                 if (cur == target)
1701                         break;
1702
1703                 pre = cur;
1704                 cur = cur->table_next;
1705         }
1706
1707         if (cur == NULL)
1708         {
1709                 ping_set_error(obj, "ping_host_remove", "Host not found (T)");
1710                 ping_free(target);
1711                 return (-1);
1712         }
1713
1714         if (pre == NULL)
1715                 obj->table[target->ident % PING_TABLE_LEN] = cur->table_next;
1716         else
1717                 pre->table_next = cur->table_next;
1718
1719         ping_free (cur);
1720
1721         return (0);
1722 }
1723
1724 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1725 {
1726         if (obj == NULL)
1727                 return (NULL);
1728         return ((pingobj_iter_t *) obj->head);
1729 }
1730
1731 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1732 {
1733         if (iter == NULL)
1734                 return (NULL);
1735         return ((pingobj_iter_t *) iter->next);
1736 }
1737
1738 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1739                 void *buffer, size_t *buffer_len)
1740 {
1741         int ret = EINVAL;
1742
1743         size_t orig_buffer_len = *buffer_len;
1744
1745         if ((iter == NULL) || (buffer_len == NULL))
1746                 return (-1);
1747
1748         if ((buffer == NULL) && (*buffer_len != 0 ))
1749                 return (-1);
1750
1751         switch (info)
1752         {
1753                 case PING_INFO_USERNAME:
1754                         ret = ENOMEM;
1755                         *buffer_len = strlen (iter->username) + 1;
1756                         if (orig_buffer_len <= *buffer_len)
1757                                 break;
1758                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1759                          * will copy `*buffer_len' and pad the rest of
1760                          * `buffer' with null-bytes */
1761                         strncpy (buffer, iter->username, orig_buffer_len);
1762                         ret = 0;
1763                         break;
1764
1765                 case PING_INFO_HOSTNAME:
1766                         ret = ENOMEM;
1767                         *buffer_len = strlen (iter->hostname) + 1;
1768                         if (orig_buffer_len < *buffer_len)
1769                                 break;
1770                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1771                          * will copy `*buffer_len' and pad the rest of
1772                          * `buffer' with null-bytes */
1773                         strncpy (buffer, iter->hostname, orig_buffer_len);
1774                         ret = 0;
1775                         break;
1776
1777                 case PING_INFO_ADDRESS:
1778                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1779                                         iter->addrlen,
1780                                         (char *) buffer,
1781                                         *buffer_len,
1782                                         NULL, 0,
1783                                         NI_NUMERICHOST);
1784                         if (ret != 0)
1785                         {
1786                                 if ((ret == EAI_MEMORY)
1787 #ifdef EAI_OVERFLOW
1788                                                 || (ret == EAI_OVERFLOW)
1789 #endif
1790                                    )
1791                                         ret = ENOMEM;
1792 #if defined(EAI_SYSTEM)
1793                                 else if (ret == EAI_SYSTEM)
1794                                         ret = errno;
1795 #endif
1796                                 else
1797                                         ret = EINVAL;
1798                         }
1799                         break;
1800
1801                 case PING_INFO_FAMILY:
1802                         ret = ENOMEM;
1803                         *buffer_len = sizeof (int);
1804                         if (orig_buffer_len < sizeof (int))
1805                                 break;
1806                         *((int *) buffer) = iter->addrfamily;
1807                         ret = 0;
1808                         break;
1809
1810                 case PING_INFO_LATENCY:
1811                         ret = ENOMEM;
1812                         *buffer_len = sizeof (double);
1813                         if (orig_buffer_len < sizeof (double))
1814                                 break;
1815                         *((double *) buffer) = iter->latency;
1816                         ret = 0;
1817                         break;
1818
1819                 case PING_INFO_DROPPED:
1820                         ret = ENOMEM;
1821                         *buffer_len = sizeof (uint32_t);
1822                         if (orig_buffer_len < sizeof (uint32_t))
1823                                 break;
1824                         *((uint32_t *) buffer) = iter->dropped;
1825                         ret = 0;
1826                         break;
1827
1828                 case PING_INFO_SEQUENCE:
1829                         ret = ENOMEM;
1830                         *buffer_len = sizeof (unsigned int);
1831                         if (orig_buffer_len < sizeof (unsigned int))
1832                                 break;
1833                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1834                         ret = 0;
1835                         break;
1836
1837                 case PING_INFO_IDENT:
1838                         ret = ENOMEM;
1839                         *buffer_len = sizeof (uint16_t);
1840                         if (orig_buffer_len < sizeof (uint16_t))
1841                                 break;
1842                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1843                         ret = 0;
1844                         break;
1845
1846                 case PING_INFO_DATA:
1847                         ret = ENOMEM;
1848                         *buffer_len = strlen (iter->data);
1849                         if (orig_buffer_len < *buffer_len)
1850                                 break;
1851                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1852                         ret = 0;
1853                         break;
1854
1855                 case PING_INFO_RECV_TTL:
1856                         ret = ENOMEM;
1857                         *buffer_len = sizeof (int);
1858                         if (orig_buffer_len < sizeof (int))
1859                                 break;
1860                         *((int *) buffer) = iter->recv_ttl;
1861                         ret = 0;
1862                         break;
1863
1864                 case PING_INFO_RECV_QOS:
1865                         ret = ENOMEM;
1866                         if (*buffer_len>sizeof(unsigned)) *buffer_len=sizeof(unsigned);
1867                         if (!*buffer_len) *buffer_len=1;
1868                         if (orig_buffer_len < *buffer_len)
1869                                 break;
1870                         memcpy(buffer,&iter->recv_qos,*buffer_len);
1871                         ret = 0;
1872                         break;
1873         }
1874
1875         return (ret);
1876 } /* ping_iterator_get_info */
1877
1878 void *ping_iterator_get_context (pingobj_iter_t *iter)
1879 {
1880         if (iter == NULL)
1881                 return (NULL);
1882         return (iter->context);
1883 }
1884
1885 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1886 {
1887         if (iter == NULL)
1888                 return;
1889         iter->context = context;
1890 }