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