src/liboping.c

   1 /**
   2  * Object oriented C module to send ICMP and ICMPv6 `echo's.
   3  * Copyright (C) 2006-2009  Florian octo Forster <octo at verplant.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; only version 2 of the License is
   8  * applicable.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  18  */
  19
  20 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #if STDC_HEADERS
  25 # include <stdlib.h>
  26 # include <stdio.h>
  27 # include <string.h>
  28 # include <inttypes.h>
  29 # include <errno.h>
  30 # include <assert.h>
  31 #else
  32 # error "You don't have the standard C99 header files installed"
  33 #endif /* STDC_HEADERS */
  34
  35 #ifdef HAVE_STDINT_H
  36 # include <stdint.h>
  37 #endif
  38
  39 #if HAVE_UNISTD_H
  40 # include <unistd.h>
  41 #endif
  42
  43 #if HAVE_FCNTL_H
  44 # include <fcntl.h>
  45 #endif
  46 #if HAVE_SYS_TYPES_H
  47 # include <sys/types.h>
  48 #endif
  49 #if HAVE_SYS_STAT_H
  50 # include <sys/stat.h>
  51 #endif
  52
  53 #if TIME_WITH_SYS_TIME
  54 # include <sys/time.h>
  55 # include <time.h>
  56 #else
  57 # if HAVE_SYS_TIME_H
  58 #  include <sys/time.h>
  59 # else
  60 #  include <time.h>
  61 # endif
  62 #endif
  63
  64 #if HAVE_SYS_SOCKET_H
  65 # include <sys/socket.h>
  66 #endif
  67
  68 #if HAVE_NETDB_H
  69 # include <netdb.h>
  70 #endif
  71
  72 #if HAVE_NETINET_IN_SYSTM_H
  73 # include <netinet/in_systm.h>
  74 #endif
  75 #if HAVE_NETINET_IN_H
  76 # include <netinet/in.h>
  77 #endif
  78 #if HAVE_NETINET_IP_H
  79 # include <netinet/ip.h>
  80 #endif
  81 #if HAVE_NETINET_IP_ICMP_H
  82 # include <netinet/ip_icmp.h>
  83 #endif
  84 #ifdef HAVE_NETINET_IP_VAR_H
  85 # include <netinet/ip_var.h>
  86 #endif
  87 #if HAVE_NETINET_IP6_H
  88 # include <netinet/ip6.h>
  89 #endif
  90 #if HAVE_NETINET_ICMP6_H
  91 # include <netinet/icmp6.h>
  92 #endif
  93
  94 #include "oping.h"
  95
  96 #if WITH_DEBUG
  97 # define dprintf(...) printf ("%s[%4i]: %-20s: ", __FILE__, __LINE__, __FUNCTION__); printf (__VA_ARGS__)
  98 #else
  99 # define dprintf(...) /**/
 100 #endif
 101
 102 #define PING_ERRMSG_LEN 256
 103
 104 struct pinghost
 105 {
 106         /* username: name passed in by the user */
 107         char                    *username;
 108         /* hostname: name returned by the reverse lookup */
 109         char                    *hostname;
 110         struct sockaddr_storage *addr;
 111         socklen_t                addrlen;
 112         int                      addrfamily;
 113         int                      fd;
 114         int                      ident;
 115         int                      sequence;
 116         struct timeval          *timer;
 117         double                   latency;
 118         uint32_t                 dropped;
 119         int                      recv_ttl;
 120         char                    *data;
 121
 122         void                    *context;
 123
 124         struct pinghost         *next;
 125 };
 126
 127 struct pingobj
 128 {
 129         double                   timeout;
 130         int                      ttl;
 131         int                      addrfamily;
 132         char                    *data;
 133
 134         struct sockaddr         *srcaddr;
 135         socklen_t                srcaddrlen;
 136
 137         char                    *device;
 138
 139         char                     errmsg[PING_ERRMSG_LEN];
 140
 141         pinghost_t              *head;
 142 };
 143
 144 /*
 145  * private (static) functions
 146  */
 147 /* Even though Posix requires "strerror_r" to return an "int",
 148  * some systems (e.g. the GNU libc) return a "char *" _and_
 149  * ignore the second argument ... -tokkee */
 150 static char *sstrerror (int errnum, char *buf, size_t buflen)
 151 {
 152         buf[0] = 0;
 153
 154 #if !HAVE_STRERROR_R
 155         {
 156                 snprintf (buf, buflen, "Error %i (%#x)", errnum, errnum);
 157         }
 158 /* #endif !HAVE_STRERROR_R */
 159
 160 #elif STRERROR_R_CHAR_P
 161         {
 162                 char *temp;
 163                 temp = strerror_r (errnum, buf, buflen);
 164                 if (buf[0] == 0)
 165                 {
 166                         if ((temp != NULL) && (temp != buf) && (temp[0] != 0))
 167                                 strncpy (buf, temp, buflen);
 168                         else
 169                                 strncpy (buf, "strerror_r did not return "
 170                                                 "an error message", buflen);
 171                 }
 172         }
 173 /* #endif STRERROR_R_CHAR_P */
 174
 175 #else
 176         if (strerror_r (errnum, buf, buflen) != 0)
 177         {
 178                 snprintf (buf, buflen, "Error %i (%#x); "
 179                                 "Additionally, strerror_r failed.",
 180                                 errnum, errnum);
 181         }
 182 #endif /* STRERROR_R_CHAR_P */
 183
 184         buf[buflen - 1] = 0;
 185
 186         return (buf);
 187 } /* char *sstrerror */
 188
 189 static void ping_set_error (pingobj_t *obj, const char *function,
 190                 const char *message)
 191 {
 192         snprintf (obj->errmsg, sizeof (obj->errmsg),
 193                         "%s: %s", function, message);
 194         obj->errmsg[sizeof (obj->errmsg) - 1] = 0;
 195 }
 196
 197 static void ping_set_errno (pingobj_t *obj, int error_number)
 198 {
 199         sstrerror (error_number, obj->errmsg, sizeof (obj->errmsg));
 200 }
 201
 202 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
 203                 struct timeval *res)
 204 {
 205         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
 206         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
 207
 208         while (res->tv_usec > 1000000)
 209         {
 210                 res->tv_usec -= 1000000;
 211                 res->tv_sec++;
 212         }
 213
 214         return (0);
 215 }
 216
 217 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
 218                 struct timeval *res)
 219 {
 220         if ((tv1->tv_sec < tv2->tv_sec)
 221                         || ((tv1->tv_sec == tv2->tv_sec)
 222                                 && (tv1->tv_usec < tv2->tv_usec)))
 223                 return (-1);
 224
 225         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
 226         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
 227
 228         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec >= 0)));
 229
 230         while (res->tv_usec < 0)
 231         {
 232                 res->tv_usec += 1000000;
 233                 res->tv_sec--;
 234         }
 235
 236         return (0);
 237 }
 238
 239 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
 240 {
 241         uint32_t sum = 0;
 242         uint16_t ret = 0;
 243
 244         uint16_t *ptr;
 245
 246         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
 247                 sum += *ptr;
 248
 249         if (len == 1)
 250         {
 251                 *(char *) &ret = *(char *) ptr;
 252                 sum += ret;
 253         }
 254
 255         /* Do this twice to get all possible carries.. */
 256         sum = (sum >> 16) + (sum & 0xFFFF);
 257         sum = (sum >> 16) + (sum & 0xFFFF);
 258
 259         ret = ~sum;
 260
 261         return (ret);
 262 }
 263
 264 static pinghost_t *ping_receive_ipv4 (pingobj_t *obj, char *buffer,
 265                 size_t buffer_len)
 266 {
 267         struct ip *ip_hdr;
 268         struct icmp *icmp_hdr;
 269
 270         size_t ip_hdr_len;
 271
 272         uint16_t recv_checksum;
 273         uint16_t calc_checksum;
 274
 275         uint16_t ident;
 276         uint16_t seq;
 277
 278         pinghost_t *ptr;
 279
 280         if (buffer_len < sizeof (struct ip))
 281                 return (NULL);
 282
 283         ip_hdr     = (struct ip *) buffer;
 284         ip_hdr_len = ip_hdr->ip_hl << 2;
 285
 286         if (buffer_len < ip_hdr_len)
 287                 return (NULL);
 288
 289         buffer     += ip_hdr_len;
 290         buffer_len -= ip_hdr_len;
 291
 292         if (buffer_len < sizeof (struct icmp))
 293                 return (NULL);
 294
 295         icmp_hdr = (struct icmp *) buffer;
 296         buffer     += sizeof (struct icmp);
 297         buffer_len -= sizeof (struct icmp);
 298
 299         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
 300         {
 301                 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
 302                 return (NULL);
 303         }
 304
 305         recv_checksum = icmp_hdr->icmp_cksum;
 306         icmp_hdr->icmp_cksum = 0;
 307         calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
 308                         sizeof (struct icmp) + buffer_len);
 309
 310         if (recv_checksum != calc_checksum)
 311         {
 312                 dprintf ("Checksum missmatch: Got 0x%04"PRIx16", "
 313                                 "calculated 0x%04"PRIx16"\n",
 314                                 recv_checksum, calc_checksum);
 315                 return (NULL);
 316         }
 317
 318         ident = ntohs (icmp_hdr->icmp_id);
 319         seq   = ntohs (icmp_hdr->icmp_seq);
 320
 321         /* We have to iterate over all hosts, since ICMPv4 packets may
 322          * be received on any raw v4 socket. */
 323         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 324         {
 325                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 326                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 327
 328                 if (ptr->addrfamily != AF_INET)
 329                         continue;
 330
 331                 if (!timerisset (ptr->timer))
 332                         continue;
 333
 334                 if (ptr->ident != ident)
 335                         continue;
 336
 337                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 338                         continue;
 339
 340                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
 341                                 "seq = %"PRIu16"\n",
 342                                 ptr->hostname, ident, seq);
 343
 344                 break;
 345         }
 346
 347         if (ptr == NULL)
 348         {
 349                 dprintf ("No match found for ident = 0x%04"PRIx16", seq = %"PRIu16"\n",
 350                                 ident, seq);
 351         }
 352
 353         if (ptr != NULL)
 354                 ptr->recv_ttl = ip_hdr->ip_ttl;
 355
 356         return (ptr);
 357 }
 358
 359 #ifndef ICMP6_ECHO_REQUEST
 360 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
 361 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
 362 # else
 363 #  define ICMP6_ECHO_REQUEST 128
 364 # endif
 365 #endif
 366
 367 #ifndef ICMP6_ECHO_REPLY
 368 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
 369 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
 370 # else
 371 #  define ICMP6_ECHO_REPLY 129
 372 # endif
 373 #endif
 374
 375 static pinghost_t *ping_receive_ipv6 (pingobj_t *obj, char *buffer,
 376                 size_t buffer_len)
 377 {
 378         struct icmp6_hdr *icmp_hdr;
 379
 380         uint16_t ident;
 381         uint16_t seq;
 382
 383         pinghost_t *ptr;
 384
 385         if (buffer_len < sizeof (struct icmp6_hdr))
 386                 return (NULL);
 387
 388         icmp_hdr = (struct icmp6_hdr *) buffer;
 389         buffer     += sizeof (struct icmp);
 390         buffer_len -= sizeof (struct icmp);
 391
 392         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 393         {
 394                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 395                 return (NULL);
 396         }
 397
 398         if (icmp_hdr->icmp6_code != 0)
 399         {
 400                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 401                 return (NULL);
 402         }
 403
 404         ident = ntohs (icmp_hdr->icmp6_id);
 405         seq   = ntohs (icmp_hdr->icmp6_seq);
 406
 407         /* We have to iterate over all hosts, since ICMPv6 packets may
 408          * be received on any raw v6 socket. */
 409         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 410         {
 411                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 412                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 413
 414                 if (ptr->addrfamily != AF_INET6)
 415                         continue;
 416
 417                 if (!timerisset (ptr->timer))
 418                         continue;
 419
 420                 if (ptr->ident != ident)
 421                         continue;
 422
 423                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 424                         continue;
 425
 426                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
 427                                 "seq = %"PRIu16"\n",
 428                                 ptr->hostname, ident, seq);
 429
 430                 break;
 431         }
 432
 433         if (ptr == NULL)
 434         {
 435                 dprintf ("No match found for ident = 0x%04"PRIx16", "
 436                                 "seq = %"PRIu16"\n",
 437                                 ident, seq);
 438         }
 439
 440         return (ptr);
 441 }
 442
 443 static int ping_receive_one (pingobj_t *obj, const pinghost_t *ph,
 444                 struct timeval *now)
 445 {
 446         /* Note: 'ph' is not necessarily the host object for which we receive a
 447          * reply. The right object will be returned by ping_receive_ipv*(). For
 448          * now, we can only rely on ph->fd and ph->addrfamily. */
 449
 450         struct timeval diff;
 451         pinghost_t *host = NULL;
 452         int recv_ttl;
 453
 454         /*
 455          * Set up the receive buffer..
 456          */
 457         struct msghdr msghdr;
 458         struct cmsghdr *cmsg;
 459         char payload_buffer[4096];
 460         ssize_t payload_buffer_len;
 461         char control_buffer[4096];
 462         struct iovec payload_iovec;
 463
 464         memset (&payload_iovec, 0, sizeof (payload_iovec));
 465         payload_iovec.iov_base = payload_buffer;
 466         payload_iovec.iov_len = sizeof (payload_buffer);
 467
 468         memset (&msghdr, 0, sizeof (msghdr));
 469         /* unspecified source address */
 470         msghdr.msg_name = NULL;
 471         msghdr.msg_namelen = 0;
 472         /* output buffer vector, see readv(2) */
 473         msghdr.msg_iov = &payload_iovec;
 474         msghdr.msg_iovlen = 1;
 475         /* output buffer for control messages */
 476         msghdr.msg_control = control_buffer;
 477         msghdr.msg_controllen = sizeof (control_buffer);
 478         /* flags; this is an output only field.. */
 479         msghdr.msg_flags = 0;
 480 #ifdef MSG_XPG4_2
 481         msghdr.msg_flags |= MSG_XPG4_2;
 482 #endif
 483
 484         payload_buffer_len = recvmsg (ph->fd, &msghdr, /* flags = */ 0);
 485         if (payload_buffer_len < 0)
 486         {
 487 #if WITH_DEBUG
 488                 char errbuf[PING_ERRMSG_LEN];
 489                 dprintf ("recvfrom: %s\n",
 490                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 491 #endif
 492                 return (-1);
 493         }
 494         dprintf ("Read %zi bytes from fd = %i\n", payload_buffer_len, ph->fd);
 495
 496         /* Iterate over all auxiliary data in msghdr */
 497         recv_ttl = -1;
 498         for (cmsg = CMSG_FIRSTHDR (&msghdr); /* {{{ */
 499                         cmsg != NULL;
 500                         cmsg = CMSG_NXTHDR (&msghdr, cmsg))
 501         {
 502                 if (ph->addrfamily == AF_INET) /* {{{ */
 503                 {
 504                         if (cmsg->cmsg_level != IPPROTO_IP)
 505                                 continue;
 506
 507                         if (cmsg->cmsg_type == IP_TTL)
 508                         {
 509                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 510                                                 sizeof (recv_ttl));
 511                                 dprintf ("TTLv4 = %i;\n", recv_ttl);
 512                         }
 513                         else
 514                         {
 515                                 dprintf ("Not handling option %i.\n",
 516                                                 cmsg->cmsg_type);
 517                         }
 518                 } /* }}} */
 519                 else if (ph->addrfamily == AF_INET6) /* {{{ */
 520                 {
 521                         if (cmsg->cmsg_level != IPPROTO_IPV6)
 522                                 continue;
 523
 524                         if (cmsg->cmsg_type == IPV6_HOPLIMIT)
 525                         {
 526                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 527                                                 sizeof (recv_ttl));
 528                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 529                         }
 530                         else
 531                         {
 532                                 dprintf ("Not handling option %i.\n",
 533                                                 cmsg->cmsg_type);
 534                         }
 535                 } /* }}} */
 536                 else
 537                 {
 538                         dprintf ("Don't know how to handle "
 539                                         "unknown protocol %i.\n",
 540                                         cmsg->cmsg_level);
 541                 }
 542         } /* }}} for (cmsg) */
 543
 544         if (ph->addrfamily == AF_INET)
 545         {
 546                 host = ping_receive_ipv4 (obj, payload_buffer, payload_buffer_len);
 547                 if (host == NULL)
 548                         return (-1);
 549         }
 550         else if (ph->addrfamily == AF_INET6)
 551         {
 552                 host = ping_receive_ipv6 (obj, payload_buffer, payload_buffer_len);
 553                 if (host == NULL)
 554                         return (-1);
 555         }
 556         else
 557         {
 558                 dprintf ("ping_receive_one: Unknown address family %i.\n",
 559                                 ph->addrfamily);
 560                 return (-1);
 561         }
 562
 563         dprintf ("rcvd: %12i.%06i\n",
 564                         (int) now->tv_sec,
 565                         (int) now->tv_usec);
 566         dprintf ("sent: %12i.%06i\n",
 567                         (int) host->timer->tv_sec,
 568                         (int) host->timer->tv_usec);
 569
 570         if (ping_timeval_sub (now, host->timer, &diff) < 0)
 571         {
 572                 timerclear (host->timer);
 573                 return (-1);
 574         }
 575
 576         dprintf ("diff: %12i.%06i\n",
 577                         (int) diff.tv_sec,
 578                         (int) diff.tv_usec);
 579
 580         if (recv_ttl >= 0)
 581                 host->recv_ttl = recv_ttl;
 582
 583         host->latency  = ((double) diff.tv_usec) / 1000.0;
 584         host->latency += ((double) diff.tv_sec)  * 1000.0;
 585
 586         timerclear (host->timer);
 587
 588         return (0);
 589 }
 590
 591 static int ping_receive_all (pingobj_t *obj)
 592 {
 593         fd_set readfds;
 594         int num_readfds;
 595         int max_readfds;
 596
 597         pinghost_t *ph;
 598         pinghost_t *ptr;
 599
 600         struct timeval endtime;
 601         struct timeval nowtime;
 602         struct timeval timeout;
 603         int status;
 604
 605         int ret;
 606
 607         ph = obj->head;
 608         ret = 0;
 609
 610         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 611         {
 612                 ptr->latency  = -1.0;
 613                 ptr->recv_ttl = -1;
 614         }
 615
 616         if (gettimeofday (&nowtime, NULL) == -1)
 617         {
 618                 ping_set_errno (obj, errno);
 619                 return (-1);
 620         }
 621
 622         /* Set up timeout */
 623         timeout.tv_sec = (time_t) obj->timeout;
 624         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 625
 626         dprintf ("Set timeout to %i.%06i seconds\n",
 627                         (int) timeout.tv_sec,
 628                         (int) timeout.tv_usec);
 629
 630         ping_timeval_add (&nowtime, &timeout, &endtime);
 631
 632         while (1)
 633         {
 634                 FD_ZERO (&readfds);
 635                 num_readfds =  0;
 636                 max_readfds = -1;
 637
 638                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 639                 {
 640                         if (!timerisset (ptr->timer))
 641                                 continue;
 642
 643                         FD_SET (ptr->fd, &readfds);
 644                         num_readfds++;
 645
 646                         if (max_readfds < ptr->fd)
 647                                 max_readfds = ptr->fd;
 648                 }
 649
 650                 if (num_readfds == 0)
 651                         break;
 652
 653                 if (gettimeofday (&nowtime, NULL) == -1)
 654                 {
 655                         ping_set_errno (obj, errno);
 656                         return (-1);
 657                 }
 658
 659                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 660                         break;
 661
 662                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_readfds,
 663                                 (int) timeout.tv_sec,
 664                                 (int) timeout.tv_usec);
 665
 666                 status = select (max_readfds + 1, &readfds, NULL, NULL, &timeout);
 667
 668                 if (gettimeofday (&nowtime, NULL) == -1)
 669                 {
 670                         ping_set_errno (obj, errno);
 671                         return (-1);
 672                 }
 673
 674                 if ((status == -1) && (errno == EINTR))
 675                 {
 676                         dprintf ("select was interrupted by signal..\n");
 677                         continue;
 678                 }
 679                 else if (status < 0)
 680                 {
 681 #if WITH_DEBUG
 682                         char errbuf[PING_ERRMSG_LEN];
 683                         dprintf ("select: %s\n",
 684                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 685 #endif
 686                         break;
 687                 }
 688                 else if (status == 0)
 689                 {
 690                         dprintf ("select timed out\n");
 691                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 692                                 if (ptr->latency < 0.0)
 693                                         ptr->dropped++;
 694                         break;
 695                 }
 696
 697                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 698                 {
 699                         if (FD_ISSET (ptr->fd, &readfds))
 700                                 if (ping_receive_one (obj, ptr, &nowtime) == 0)
 701                                         ret++;
 702                 }
 703         } /* while (1) */
 704
 705         return (ret);
 706 }
 707
 708 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 709  * Sending functions:                                                        *
 710  *                                                                           *
 711  * ping_send_all                                                             *
 712  * +-> ping_send_one_ipv4                                                    *
 713  * `-> ping_send_one_ipv6                                                    *
 714  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 715 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 716                 const void *buf, size_t buflen)
 717 {
 718         ssize_t ret;
 719
 720         if (gettimeofday (ph->timer, NULL) == -1)
 721         {
 722                 timerclear (ph->timer);
 723                 return (-1);
 724         }
 725
 726         ret = sendto (ph->fd, buf, buflen, 0,
 727                         (struct sockaddr *) ph->addr, ph->addrlen);
 728
 729         if (ret < 0)
 730         {
 731 #if defined(EHOSTUNREACH)
 732                 if (errno == EHOSTUNREACH)
 733                         return (0);
 734 #endif
 735 #if defined(ENETUNREACH)
 736                 if (errno == ENETUNREACH)
 737                         return (0);
 738 #endif
 739                 ping_set_errno (obj, errno);
 740         }
 741
 742         return (ret);
 743 }
 744
 745 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 746 {
 747         struct icmp *icmp4;
 748         int status;
 749
 750         char buf[4096];
 751         int  buflen;
 752
 753         char *data;
 754         int   datalen;
 755
 756         dprintf ("ph->hostname = %s\n", ph->hostname);
 757
 758         memset (buf, '\0', sizeof (buf));
 759         icmp4 = (struct icmp *) buf;
 760         data  = (char *) (icmp4 + 1);
 761
 762         icmp4->icmp_type  = ICMP_ECHO;
 763         icmp4->icmp_code  = 0;
 764         icmp4->icmp_cksum = 0;
 765         icmp4->icmp_id    = htons (ph->ident);
 766         icmp4->icmp_seq   = htons (ph->sequence);
 767
 768         buflen = 4096 - sizeof (struct icmp);
 769         strncpy (data, ph->data, buflen);
 770         datalen = strlen (data);
 771
 772         buflen = datalen + sizeof (struct icmp);
 773
 774         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 775
 776         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 777
 778         status = ping_sendto (obj, ph, buf, buflen);
 779         if (status < 0)
 780         {
 781                 perror ("ping_sendto");
 782                 return (-1);
 783         }
 784
 785         dprintf ("sendto: status = %i\n", status);
 786
 787         return (0);
 788 }
 789
 790 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 791 {
 792         struct icmp6_hdr *icmp6;
 793         int status;
 794
 795         char buf[4096];
 796         int  buflen;
 797
 798         char *data;
 799         int   datalen;
 800
 801         dprintf ("ph->hostname = %s\n", ph->hostname);
 802
 803         memset (buf, '\0', sizeof (buf));
 804         icmp6 = (struct icmp6_hdr *) buf;
 805         data  = (char *) (icmp6 + 1);
 806
 807         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 808         icmp6->icmp6_code  = 0;
 809         /* The checksum will be calculated by the TCP/IP stack.  */
 810         /* FIXME */
 811         icmp6->icmp6_cksum = 0;
 812         icmp6->icmp6_id    = htons (ph->ident);
 813         icmp6->icmp6_seq   = htons (ph->sequence);
 814
 815         buflen = 4096 - sizeof (struct icmp6_hdr);
 816         strncpy (data, ph->data, buflen);
 817         datalen = strlen (data);
 818
 819         buflen = datalen + sizeof (struct icmp6_hdr);
 820
 821         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 822
 823         status = ping_sendto (obj, ph, buf, buflen);
 824         if (status < 0)
 825         {
 826                 perror ("ping_sendto");
 827                 return (-1);
 828         }
 829
 830         dprintf ("sendto: status = %i\n", status);
 831
 832         return (0);
 833 }
 834
 835 static int ping_send_all (pingobj_t *obj)
 836 {
 837         pinghost_t *ph;
 838         pinghost_t *ptr;
 839
 840         int ret;
 841
 842         ret = 0;
 843         ph = obj->head;
 844
 845         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 846         {
 847                 /* start timer.. The GNU `ping6' starts the timer before
 848                  * sending the packet, so I will do that too */
 849                 if (gettimeofday (ptr->timer, NULL) == -1)
 850                 {
 851 #if WITH_DEBUG
 852                         char errbuf[PING_ERRMSG_LEN];
 853                         dprintf ("gettimeofday: %s\n",
 854                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 855 #endif
 856                         timerclear (ptr->timer);
 857                         ret--;
 858                         continue;
 859                 }
 860                 else
 861                 {
 862                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 863                 }
 864
 865                 if (ptr->addrfamily == AF_INET6)
 866                 {
 867                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 868                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 869                         {
 870                                 timerclear (ptr->timer);
 871                                 ret--;
 872                                 continue;
 873                         }
 874                 }
 875                 else if (ptr->addrfamily == AF_INET)
 876                 {
 877                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 878                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 879                         {
 880                                 timerclear (ptr->timer);
 881                                 ret--;
 882                                 continue;
 883                         }
 884                 }
 885                 else /* this should not happen */
 886                 {
 887                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 888                         timerclear (ptr->timer);
 889                         ret--;
 890                         continue;
 891                 }
 892
 893                 ptr->sequence++;
 894         }
 895
 896         return (ret);
 897 }
 898
 899 /*
 900  * Set the TTL of a socket protocol independently.
 901  */
 902 static int ping_set_ttl (pinghost_t *ph, int ttl)
 903 {
 904         int ret = -2;
 905
 906         if (ph->addrfamily == AF_INET)
 907         {
 908                 dprintf ("Setting TTLv4 to %i\n", ttl);
 909                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL,
 910                                 &ttl, sizeof (ttl));
 911         }
 912         else if (ph->addrfamily == AF_INET6)
 913         {
 914                 dprintf ("Setting TTLv6 to %i\n", ttl);
 915                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
 916                                 &ttl, sizeof (ttl));
 917         }
 918
 919         return (ret);
 920 }
 921
 922 static int ping_get_ident (void)
 923 {
 924         int fd;
 925         static int did_seed = 0;
 926
 927         int retval;
 928
 929         if (did_seed == 0)
 930         {
 931                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 932                 {
 933                         unsigned int seed;
 934
 935                         if (read (fd, &seed, sizeof (seed)) != -1)
 936                         {
 937                                 did_seed = 1;
 938                                 dprintf ("Random seed:   %#x\n", seed);
 939                                 srandom (seed);
 940                         }
 941
 942                         close (fd);
 943                 }
 944 #if WITH_DEBUG
 945                 else
 946                 {
 947                         char errbuf[PING_ERRMSG_LEN];
 948                         dprintf ("open (/dev/urandom): %s\n",
 949                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 950                 }
 951 #endif
 952         }
 953
 954         retval = (int) random ();
 955
 956         dprintf ("Random number: %#x\n", retval);
 957
 958         return (retval);
 959 }
 960
 961 static pinghost_t *ping_alloc (void)
 962 {
 963         pinghost_t *ph;
 964         size_t      ph_size;
 965
 966         ph_size = sizeof (pinghost_t)
 967                 + sizeof (struct sockaddr_storage)
 968                 + sizeof (struct timeval);
 969
 970         ph = (pinghost_t *) malloc (ph_size);
 971         if (ph == NULL)
 972                 return (NULL);
 973
 974         memset (ph, '\0', ph_size);
 975
 976         ph->timer   = (struct timeval *) (ph + 1);
 977         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
 978
 979         ph->addrlen = sizeof (struct sockaddr_storage);
 980         ph->fd      = -1;
 981         ph->latency = -1.0;
 982         ph->dropped = 0;
 983         ph->ident   = ping_get_ident () & 0xFFFF;
 984
 985         return (ph);
 986 }
 987
 988 static void ping_free (pinghost_t *ph)
 989 {
 990         if (ph->fd >= 0)
 991                 close (ph->fd);
 992
 993         if (ph->username != NULL)
 994                 free (ph->username);
 995
 996         if (ph->hostname != NULL)
 997                 free (ph->hostname);
 998
 999         if (ph->data != NULL)
1000                 free (ph->data);
1001
1002         free (ph);
1003 }
1004
1005 /*
1006  * public methods
1007  */
1008 const char *ping_get_error (pingobj_t *obj)
1009 {
1010         if (obj == NULL)
1011                 return (NULL);
1012         return (obj->errmsg);
1013 }
1014
1015 pingobj_t *ping_construct (void)
1016 {
1017         pingobj_t *obj;
1018
1019         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
1020                 return (NULL);
1021         memset (obj, '\0', sizeof (pingobj_t));
1022
1023         obj->timeout    = PING_DEF_TIMEOUT;
1024         obj->ttl        = PING_DEF_TTL;
1025         obj->addrfamily = PING_DEF_AF;
1026         obj->data       = strdup (PING_DEF_DATA);
1027
1028         return (obj);
1029 }
1030
1031 void ping_destroy (pingobj_t *obj)
1032 {
1033         pinghost_t *current;
1034         pinghost_t *next;
1035
1036         if (obj == NULL)
1037                 return;
1038
1039         current = obj->head;
1040         next = NULL;
1041
1042         while (current != NULL)
1043         {
1044                 next = current->next;
1045                 ping_free (current);
1046                 current = next;
1047         }
1048
1049         if (obj->data != NULL)
1050                 free (obj->data);
1051
1052         if (obj->srcaddr != NULL)
1053                 free (obj->srcaddr);
1054
1055         if (obj->device != NULL)
1056                 free (obj->device);
1057
1058         free (obj);
1059
1060         return;
1061 }
1062
1063 int ping_setopt (pingobj_t *obj, int option, void *value)
1064 {
1065         int ret = 0;
1066
1067         if ((obj == NULL) || (value == NULL))
1068                 return (-1);
1069
1070         switch (option)
1071         {
1072                 case PING_OPT_TIMEOUT:
1073                         obj->timeout = *((double *) value);
1074                         if (obj->timeout < 0.0)
1075                         {
1076                                 obj->timeout = PING_DEF_TIMEOUT;
1077                                 ret = -1;
1078                         }
1079                         break;
1080
1081                 case PING_OPT_TTL:
1082                         obj->ttl = *((int *) value);
1083                         if ((obj->ttl < 1) || (obj->ttl > 255))
1084                         {
1085                                 obj->ttl = PING_DEF_TTL;
1086                                 ret = -1;
1087                         }
1088                         else
1089                         {
1090                                 pinghost_t *ph;
1091
1092                                 for (ph = obj->head; ph != NULL; ph = ph->next)
1093                                         ping_set_ttl (ph, obj->ttl);
1094                         }
1095                         break;
1096
1097                 case PING_OPT_AF:
1098                         obj->addrfamily = *((int *) value);
1099                         if ((obj->addrfamily != AF_UNSPEC)
1100                                         && (obj->addrfamily != AF_INET)
1101                                         && (obj->addrfamily != AF_INET6))
1102                         {
1103                                 obj->addrfamily = PING_DEF_AF;
1104                                 ret = -1;
1105                         }
1106                         if (obj->srcaddr != NULL)
1107                         {
1108                                 free (obj->srcaddr);
1109                                 obj->srcaddr = NULL;
1110                         }
1111                         break;
1112
1113                 case PING_OPT_DATA:
1114                         if (obj->data != NULL)
1115                         {
1116                                 free (obj->data);
1117                                 obj->data = NULL;
1118                         }
1119                         obj->data = strdup ((const char *) value);
1120                         break;
1121
1122                 case PING_OPT_SOURCE:
1123                 {
1124                         char            *hostname = (char *) value;
1125                         struct addrinfo  ai_hints;
1126                         struct addrinfo *ai_list;
1127                         int              status;
1128 #if WITH_DEBUG
1129                         if (obj->addrfamily != AF_UNSPEC)
1130                         {
1131                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1132                         }
1133 #endif
1134                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1135                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1136 #if defined(AI_ADDRCONFIG)
1137                         ai_hints.ai_flags = AI_ADDRCONFIG;
1138 #endif
1139                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1140                         if (status != 0)
1141                         {
1142 #if defined(EAI_SYSTEM)
1143                                 char errbuf[PING_ERRMSG_LEN];
1144 #endif
1145                                 ping_set_error (obj, "getaddrinfo",
1146 #if defined(EAI_SYSTEM)
1147                                                 (status == EAI_SYSTEM)
1148                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1149 #endif
1150                                                 gai_strerror (status));
1151                                 ret = -1;
1152                                 break;
1153                         }
1154 #if WITH_DEBUG
1155                         if (ai_list->ai_next != NULL)
1156                         {
1157                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1158                         }
1159 #endif
1160                         if (obj->srcaddr == NULL)
1161                         {
1162                                 obj->srcaddrlen = 0;
1163                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1164                                 if (obj->srcaddr == NULL)
1165                                 {
1166                                         ping_set_errno (obj, errno);
1167                                         ret = -1;
1168                                         freeaddrinfo (ai_list);
1169                                         break;
1170                                 }
1171                         }
1172                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1173                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1174                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1175                                         ai_list->ai_addrlen);
1176                         obj->srcaddrlen = ai_list->ai_addrlen;
1177                         obj->addrfamily = ai_list->ai_family;
1178
1179                         freeaddrinfo (ai_list);
1180                 } /* case PING_OPT_SOURCE */
1181                 break;
1182
1183                 case PING_OPT_DEVICE:
1184                 {
1185 #ifdef SO_BINDTODEVICE
1186                         char *device = strdup ((char *) value);
1187
1188                         if (device == NULL)
1189                         {
1190                                 ping_set_errno (obj, errno);
1191                                 ret = -1;
1192                                 break;
1193                         }
1194
1195                         if (obj->device != NULL)
1196                                 free (obj->device);
1197                         obj->device = device;
1198 #else /* ! SO_BINDTODEVICE */
1199                         ping_set_errno (obj, ENOTSUP);
1200                         ret = -1;
1201 #endif /* ! SO_BINDTODEVICE */
1202                 } /* case PING_OPT_DEVICE */
1203                 break;
1204
1205                 default:
1206                         ret = -2;
1207         } /* switch (option) */
1208
1209         return (ret);
1210 } /* int ping_setopt */
1211
1212
1213 int ping_send (pingobj_t *obj)
1214 {
1215         int ret;
1216
1217         if (obj == NULL)
1218                 return (-1);
1219
1220         if (ping_send_all (obj) < 0)
1221                 return (-1);
1222
1223         if ((ret = ping_receive_all (obj)) < 0)
1224                 return (-2);
1225
1226         return (ret);
1227 }
1228
1229 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1230 {
1231         while (ph != NULL)
1232         {
1233                 if (strcasecmp (ph->username, host) == 0)
1234                         break;
1235
1236                 ph = ph->next;
1237         }
1238
1239         return (ph);
1240 }
1241
1242 int ping_host_add (pingobj_t *obj, const char *host)
1243 {
1244         pinghost_t *ph;
1245
1246         struct addrinfo  ai_hints;
1247         struct addrinfo *ai_list, *ai_ptr;
1248         int              ai_return;
1249
1250         if ((obj == NULL) || (host == NULL))
1251                 return (-1);
1252
1253         dprintf ("host = %s\n", host);
1254
1255         if (ping_host_search (obj->head, host) != NULL)
1256                 return (0);
1257
1258         memset (&ai_hints, '\0', sizeof (ai_hints));
1259         ai_hints.ai_flags     = 0;
1260 #ifdef AI_ADDRCONFIG
1261         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1262 #endif
1263 #ifdef AI_CANONNAME
1264         ai_hints.ai_flags    |= AI_CANONNAME;
1265 #endif
1266         ai_hints.ai_family    = obj->addrfamily;
1267         ai_hints.ai_socktype  = SOCK_RAW;
1268
1269         if ((ph = ping_alloc ()) == NULL)
1270         {
1271                 dprintf ("Out of memory!\n");
1272                 return (-1);
1273         }
1274
1275         if ((ph->username = strdup (host)) == NULL)
1276         {
1277                 dprintf ("Out of memory!\n");
1278                 ping_set_errno (obj, errno);
1279                 ping_free (ph);
1280                 return (-1);
1281         }
1282
1283         if ((ph->hostname = strdup (host)) == NULL)
1284         {
1285                 dprintf ("Out of memory!\n");
1286                 ping_set_errno (obj, errno);
1287                 ping_free (ph);
1288                 return (-1);
1289         }
1290
1291         /* obj->data is not garuanteed to be != NULL */
1292         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1293         {
1294                 dprintf ("Out of memory!\n");
1295                 ping_set_errno (obj, errno);
1296                 ping_free (ph);
1297                 return (-1);
1298         }
1299
1300         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1301         {
1302 #if defined(EAI_SYSTEM)
1303                 char errbuf[PING_ERRMSG_LEN];
1304 #endif
1305                 dprintf ("getaddrinfo failed\n");
1306                 ping_set_error (obj, "getaddrinfo",
1307 #if defined(EAI_SYSTEM)
1308                                                 (ai_return == EAI_SYSTEM)
1309                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1310 #endif
1311                                 gai_strerror (ai_return));
1312                 ping_free (ph);
1313                 return (-1);
1314         }
1315
1316         if (ai_list == NULL)
1317                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1318
1319         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1320         {
1321                 ph->fd = -1;
1322
1323                 if (ai_ptr->ai_family == AF_INET)
1324                 {
1325                         ai_ptr->ai_socktype = SOCK_RAW;
1326                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1327                 }
1328                 else if (ai_ptr->ai_family == AF_INET6)
1329                 {
1330                         ai_ptr->ai_socktype = SOCK_RAW;
1331                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1332                 }
1333                 else
1334                 {
1335                         char errmsg[PING_ERRMSG_LEN];
1336
1337                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1338                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1339
1340                         dprintf (errmsg);
1341                         ping_set_error (obj, "getaddrinfo", errmsg);
1342                         continue;
1343                 }
1344
1345                 /* TODO: Move this to a static function `ping_open_socket' and
1346                  * call it whenever the socket dies. */
1347                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1348                 if (ph->fd == -1)
1349                 {
1350 #if WITH_DEBUG
1351                         char errbuf[PING_ERRMSG_LEN];
1352                         dprintf ("socket: %s\n",
1353                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1354 #endif
1355                         ping_set_errno (obj, errno);
1356                         continue;
1357                 }
1358
1359                 if (obj->srcaddr != NULL)
1360                 {
1361                         assert (obj->srcaddrlen > 0);
1362                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1363
1364                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1365                         {
1366 #if WITH_DEBUG
1367                                 char errbuf[PING_ERRMSG_LEN];
1368                                 dprintf ("bind: %s\n",
1369                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1370 #endif
1371                                 ping_set_errno (obj, errno);
1372                                 close (ph->fd);
1373                                 ph->fd = -1;
1374                                 continue;
1375                         }
1376                 }
1377
1378 #ifdef SO_BINDTODEVICE
1379                 if (obj->device != NULL)
1380                 {
1381                         if (setsockopt (ph->fd, SOL_SOCKET, SO_BINDTODEVICE,
1382                                         obj->device, strlen (obj->device) + 1) != 0)
1383                         {
1384 #if WITH_DEBUG
1385                                 char errbuf[PING_ERRMSG_LEN];
1386                                 dprintf ("setsockopt: %s\n",
1387                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1388 #endif
1389                                 ping_set_errno (obj, errno);
1390                                 close (ph->fd);
1391                                 ph->fd = -1;
1392                                 continue;
1393                         }
1394                 }
1395 #endif /* SO_BINDTODEVICE */
1396
1397                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1398                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1399                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1400                 ph->addrlen = ai_ptr->ai_addrlen;
1401                 ph->addrfamily = ai_ptr->ai_family;
1402
1403 #ifdef AI_CANONNAME
1404                 if ((ai_ptr->ai_canonname != NULL)
1405                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1406                 {
1407                         char *old_hostname;
1408
1409                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1410                                         ph->hostname, ai_ptr->ai_canonname);
1411
1412                         old_hostname = ph->hostname;
1413                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1414                         {
1415                                 /* strdup failed, falling back to old hostname */
1416                                 ph->hostname = old_hostname;
1417                         }
1418                         else if (old_hostname != NULL)
1419                         {
1420                                 free (old_hostname);
1421                         }
1422                 }
1423 #endif /* AI_CANONNAME */
1424
1425                 if (ph->addrfamily == AF_INET)
1426                 {
1427                         int opt = 1;
1428
1429                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1430                                         &opt, sizeof (opt));
1431                 }
1432 #if defined(IPPROTO_IPV6) && defined(IPV6_RECVHOPLIMIT)
1433                 else if (ph->addrfamily == AF_INET6)
1434                 {
1435                         int opt = 1;
1436
1437                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1438                                         &opt, sizeof (opt));
1439                 }
1440 #endif
1441
1442                 break;
1443         }
1444
1445         freeaddrinfo (ai_list);
1446
1447         if (ph->fd < 0)
1448         {
1449                 ping_free (ph);
1450                 return (-1);
1451         }
1452
1453         /*
1454          * Adding in the front is much easier, but then the iterator will
1455          * return the host that was added last as first host. That's just not
1456          * nice. -octo
1457          */
1458         if (obj->head == NULL)
1459         {
1460                 obj->head = ph;
1461         }
1462         else
1463         {
1464                 pinghost_t *hptr;
1465
1466                 hptr = obj->head;
1467                 while (hptr->next != NULL)
1468                         hptr = hptr->next;
1469
1470                 assert ((hptr != NULL) && (hptr->next == NULL));
1471                 hptr->next = ph;
1472         }
1473
1474         ping_set_ttl (ph, obj->ttl);
1475
1476         return (0);
1477 } /* int ping_host_add */
1478
1479 int ping_host_remove (pingobj_t *obj, const char *host)
1480 {
1481         pinghost_t *pre, *cur;
1482
1483         if ((obj == NULL) || (host == NULL))
1484                 return (-1);
1485
1486         pre = NULL;
1487         cur = obj->head;
1488
1489         while (cur != NULL)
1490         {
1491                 if (strcasecmp (host, cur->username) == 0)
1492                         break;
1493
1494                 pre = cur;
1495                 cur = cur->next;
1496         }
1497
1498         if (cur == NULL)
1499         {
1500                 ping_set_error (obj, "ping_host_remove", "Host not found");
1501                 return (-1);
1502         }
1503
1504         if (pre == NULL)
1505                 obj->head = cur->next;
1506         else
1507                 pre->next = cur->next;
1508
1509         ping_free (cur);
1510
1511         return (0);
1512 }
1513
1514 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1515 {
1516         if (obj == NULL)
1517                 return (NULL);
1518         return ((pingobj_iter_t *) obj->head);
1519 }
1520
1521 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1522 {
1523         if (iter == NULL)
1524                 return (NULL);
1525         return ((pingobj_iter_t *) iter->next);
1526 }
1527
1528 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1529                 void *buffer, size_t *buffer_len)
1530 {
1531         int ret = EINVAL;
1532
1533         size_t orig_buffer_len = *buffer_len;
1534
1535         if ((iter == NULL) || (buffer == NULL) || (buffer_len == NULL))
1536                 return (-1);
1537
1538         switch (info)
1539         {
1540                 case PING_INFO_USERNAME:
1541                         ret = ENOMEM;
1542                         *buffer_len = strlen (iter->username) + 1;
1543                         if (orig_buffer_len <= *buffer_len)
1544                                 break;
1545                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1546                          * will copy `*buffer_len' and pad the rest of
1547                          * `buffer' with null-bytes */
1548                         strncpy (buffer, iter->username, orig_buffer_len);
1549                         ret = 0;
1550                         break;
1551
1552                 case PING_INFO_HOSTNAME:
1553                         ret = ENOMEM;
1554                         *buffer_len = strlen (iter->hostname) + 1;
1555                         if (orig_buffer_len < *buffer_len)
1556                                 break;
1557                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1558                          * will copy `*buffer_len' and pad the rest of
1559                          * `buffer' with null-bytes */
1560                         strncpy (buffer, iter->hostname, orig_buffer_len);
1561                         ret = 0;
1562                         break;
1563
1564                 case PING_INFO_ADDRESS:
1565                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1566                                         iter->addrlen,
1567                                         (char *) buffer,
1568                                         *buffer_len,
1569                                         NULL, 0,
1570                                         NI_NUMERICHOST);
1571                         if (ret != 0)
1572                         {
1573                                 if ((ret == EAI_MEMORY)
1574 #ifdef EAI_OVERFLOW
1575                                                 || (ret == EAI_OVERFLOW)
1576 #endif
1577                                    )
1578                                         ret = ENOMEM;
1579 #if defined(EAI_SYSTEM)
1580                                 else if (ret == EAI_SYSTEM)
1581                                         ret = errno;
1582 #endif
1583                                 else
1584                                         ret = EINVAL;
1585                         }
1586                         break;
1587
1588                 case PING_INFO_FAMILY:
1589                         ret = ENOMEM;
1590                         *buffer_len = sizeof (int);
1591                         if (orig_buffer_len < sizeof (int))
1592                                 break;
1593                         *((int *) buffer) = iter->addrfamily;
1594                         ret = 0;
1595                         break;
1596
1597                 case PING_INFO_LATENCY:
1598                         ret = ENOMEM;
1599                         *buffer_len = sizeof (double);
1600                         if (orig_buffer_len < sizeof (double))
1601                                 break;
1602                         *((double *) buffer) = iter->latency;
1603                         ret = 0;
1604                         break;
1605
1606                 case PING_INFO_DROPPED:
1607                         ret = ENOMEM;
1608                         *buffer_len = sizeof (uint32_t);
1609                         if (orig_buffer_len < sizeof (uint32_t))
1610                                 break;
1611                         *((uint32_t *) buffer) = iter->dropped;
1612                         ret = 0;
1613                         break;
1614
1615                 case PING_INFO_SEQUENCE:
1616                         ret = ENOMEM;
1617                         *buffer_len = sizeof (unsigned int);
1618                         if (orig_buffer_len < sizeof (unsigned int))
1619                                 break;
1620                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1621                         ret = 0;
1622                         break;
1623
1624                 case PING_INFO_IDENT:
1625                         ret = ENOMEM;
1626                         *buffer_len = sizeof (uint16_t);
1627                         if (orig_buffer_len < sizeof (uint16_t))
1628                                 break;
1629                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1630                         ret = 0;
1631                         break;
1632
1633                 case PING_INFO_DATA:
1634                         ret = ENOMEM;
1635                         *buffer_len = strlen (iter->data);
1636                         if (orig_buffer_len < *buffer_len)
1637                                 break;
1638                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1639                         ret = 0;
1640                         break;
1641
1642                 case PING_INFO_RECV_TTL:
1643                         ret = ENOMEM;
1644                         *buffer_len = sizeof (int);
1645                         if (orig_buffer_len < sizeof (int))
1646                                 break;
1647                         *((int *) buffer) = iter->recv_ttl;
1648                         ret = 0;
1649                         break;
1650         }
1651
1652         return (ret);
1653 } /* ping_iterator_get_info */
1654
1655 void *ping_iterator_get_context (pingobj_iter_t *iter)
1656 {
1657         if (iter == NULL)
1658                 return (NULL);
1659         return (iter->context);
1660 }
1661
1662 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1663 {
1664         if (iter == NULL)
1665                 return;
1666         iter->context = context;
1667 }