src/liboping.c

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