src/liboping.c

   1 /**
   2  * Object oriented C module to send ICMP and ICMPv6 `echo's.
   3  * Copyright (C) 2006  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 <errno.h>
  29 # include <assert.h>
  30 #else
  31 # error "You don't have the standard C99 header files installed"
  32 #endif /* STDC_HEADERS */
  33
  34 #if HAVE_UNISTD_H
  35 # include <unistd.h>
  36 #endif
  37
  38 #if HAVE_FCNTL_H
  39 # include <fcntl.h>
  40 #endif
  41 #if HAVE_SYS_TYPES_H
  42 # include <sys/types.h>
  43 #endif
  44 #if HAVE_SYS_STAT_H
  45 # include <sys/stat.h>
  46 #endif
  47
  48 #if TIME_WITH_SYS_TIME
  49 # include <sys/time.h>
  50 # include <time.h>
  51 #else
  52 # if HAVE_SYS_TIME_H
  53 #  include <sys/time.h>
  54 # else
  55 #  include <time.h>
  56 # endif
  57 #endif
  58
  59 #if HAVE_SYS_SOCKET_H
  60 # include <sys/socket.h>
  61 #endif
  62 #if HAVE_NETDB_H
  63 # include <netdb.h>
  64 #endif
  65
  66 #if HAVE_NETINET_IN_SYSTM_H
  67 # include <netinet/in_systm.h>
  68 #endif
  69 #if HAVE_NETINET_IN_H
  70 # include <netinet/in.h>
  71 #endif
  72 #if HAVE_NETINET_IP_H
  73 # include <netinet/ip.h>
  74 #endif
  75 #if HAVE_NETINET_IP_ICMP_H
  76 # include <netinet/ip_icmp.h>
  77 #endif
  78 #ifdef HAVE_NETINET_IP_VAR_H
  79 # include <netinet/ip_var.h>
  80 #endif
  81 #if HAVE_NETINET_IP6_H
  82 # include <netinet/ip6.h>
  83 #endif
  84 #if HAVE_NETINET_ICMP6_H
  85 # include <netinet/icmp6.h>
  86 #endif
  87
  88 #include "oping.h"
  89
  90 #if WITH_DEBUG
  91 # define dprintf(...) printf ("%s[%4i]: %-20s: ", __FILE__, __LINE__, __FUNCTION__); printf (__VA_ARGS__)
  92 #else
  93 # define dprintf(...) /**/
  94 #endif
  95
  96 #define PING_ERRMSG_LEN 256
  97
  98 struct pinghost
  99 {
 100         char                    *hostname;
 101         struct sockaddr_storage *addr;
 102         socklen_t                addrlen;
 103         int                      addrfamily;
 104         int                      fd;
 105         int                      ident;
 106         int                      sequence;
 107         struct timeval          *timer;
 108         double                   latency;
 109         char                    *data;
 110
 111         void                    *context;
 112
 113         struct pinghost         *next;
 114 };
 115
 116 struct pingobj
 117 {
 118         double                   timeout;
 119         int                      ttl;
 120         int                      addrfamily;
 121         char                    *data;
 122
 123         struct sockaddr_storage *srcaddr;
 124         socklen_t                srcaddrlen;
 125
 126         char                     errmsg[PING_ERRMSG_LEN];
 127
 128         pinghost_t              *head;
 129 };
 130
 131 /*
 132  * private (static) functions
 133  */
 134 static void ping_set_error (pingobj_t *obj, const char *function,
 135                 const char *message)
 136 {
 137         snprintf (obj->errmsg, PING_ERRMSG_LEN, "%s: %s", function, message);
 138         obj->errmsg[PING_ERRMSG_LEN - 1] = '\0';
 139 }
 140
 141 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
 142                 struct timeval *res)
 143 {
 144         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
 145         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
 146
 147         while (res->tv_usec > 1000000)
 148         {
 149                 res->tv_usec -= 1000000;
 150                 res->tv_sec++;
 151         }
 152
 153         return (0);
 154 }
 155
 156 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
 157                 struct timeval *res)
 158 {
 159
 160         if ((tv1->tv_sec < tv2->tv_sec)
 161                         || ((tv1->tv_sec == tv2->tv_sec)
 162                                 && (tv1->tv_usec < tv2->tv_usec)))
 163                 return (-1);
 164
 165         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
 166         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
 167
 168         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec > 0)));
 169
 170         while (res->tv_usec < 0)
 171         {
 172                 res->tv_usec += 1000000;
 173                 res->tv_sec--;
 174         }
 175
 176         return (0);
 177 }
 178
 179 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
 180 {
 181         uint32_t sum = 0;
 182         uint16_t ret = 0;
 183
 184         uint16_t *ptr;
 185
 186         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
 187                 sum += *ptr;
 188
 189         if (len == 1)
 190         {
 191                 *(char *) &ret = *(char *) ptr;
 192                 sum += ret;
 193         }
 194
 195         /* Do this twice to get all possible carries.. */
 196         sum = (sum >> 16) + (sum & 0xFFFF);
 197         sum = (sum >> 16) + (sum & 0xFFFF);
 198
 199         ret = ~sum;
 200
 201         return (ret);
 202 }
 203
 204 static pinghost_t *ping_receive_ipv4 (pinghost_t *ph, char *buffer, size_t buffer_len)
 205 {
 206         struct ip *ip_hdr;
 207         struct icmp *icmp_hdr;
 208
 209         size_t ip_hdr_len;
 210
 211         uint16_t recv_checksum;
 212         uint16_t calc_checksum;
 213
 214         uint16_t ident;
 215         uint16_t seq;
 216
 217         pinghost_t *ptr;
 218
 219         if (buffer_len < sizeof (struct ip))
 220                 return (NULL);
 221
 222         ip_hdr     = (struct ip *) buffer;
 223         ip_hdr_len = ip_hdr->ip_hl << 2;
 224
 225         if (buffer_len < ip_hdr_len)
 226                 return (NULL);
 227
 228         buffer     += ip_hdr_len;
 229         buffer_len -= ip_hdr_len;
 230
 231         if (buffer_len < sizeof (struct icmp))
 232                 return (NULL);
 233
 234         icmp_hdr = (struct icmp *) buffer;
 235         buffer     += sizeof (struct icmp);
 236         buffer_len -= sizeof (struct icmp);
 237
 238         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
 239         {
 240                 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
 241                 return (NULL);
 242         }
 243
 244         recv_checksum = icmp_hdr->icmp_cksum;
 245         icmp_hdr->icmp_cksum = 0;
 246         calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
 247                         sizeof (struct icmp) + buffer_len);
 248
 249         if (recv_checksum != calc_checksum)
 250         {
 251                 dprintf ("Checksum missmatch: Got 0x%04x, calculated 0x%04x\n",
 252                                 recv_checksum, calc_checksum);
 253                 return (NULL);
 254         }
 255
 256         ident = ntohs (icmp_hdr->icmp_id);
 257         seq   = ntohs (icmp_hdr->icmp_seq);
 258
 259         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 260         {
 261                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 262                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 263
 264                 if (ptr->addrfamily != AF_INET)
 265                         continue;
 266
 267                 if (!timerisset (ptr->timer))
 268                         continue;
 269
 270                 if (ptr->ident != ident)
 271                         continue;
 272
 273                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 274                         continue;
 275
 276                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
 277                                 ptr->hostname, ident, seq);
 278
 279                 break;
 280         }
 281
 282         if (ptr == NULL)
 283         {
 284                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
 285                                 ident, seq);
 286         }
 287
 288         return (ptr);
 289 }
 290
 291 #ifndef ICMP6_ECHO_REQUEST
 292 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
 293 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
 294 # else
 295 #  define ICMP6_ECHO_REQUEST 128
 296 # endif
 297 #endif
 298
 299 #ifndef ICMP6_ECHO_REPLY
 300 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
 301 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
 302 # else
 303 #  define ICMP6_ECHO_REPLY 129
 304 # endif
 305 #endif
 306
 307 static pinghost_t *ping_receive_ipv6 (pinghost_t *ph, char *buffer, size_t buffer_len)
 308 {
 309         struct icmp6_hdr *icmp_hdr;
 310
 311         uint16_t ident;
 312         uint16_t seq;
 313
 314         pinghost_t *ptr;
 315
 316         if (buffer_len < sizeof (struct icmp6_hdr))
 317                 return (NULL);
 318
 319         icmp_hdr = (struct icmp6_hdr *) buffer;
 320         buffer     += sizeof (struct icmp);
 321         buffer_len -= sizeof (struct icmp);
 322
 323         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 324         {
 325                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 326                 return (NULL);
 327         }
 328
 329         if (icmp_hdr->icmp6_code != 0)
 330         {
 331                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 332                 return (NULL);
 333         }
 334
 335         ident = ntohs (icmp_hdr->icmp6_id);
 336         seq   = ntohs (icmp_hdr->icmp6_seq);
 337
 338         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 339         {
 340                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 341                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 342
 343                 if (ptr->addrfamily != AF_INET6)
 344                         continue;
 345
 346                 if (!timerisset (ptr->timer))
 347                         continue;
 348
 349                 if (ptr->ident != ident)
 350                         continue;
 351
 352                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 353                         continue;
 354
 355                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
 356                                 ptr->hostname, ident, seq);
 357
 358                 break;
 359         }
 360
 361         if (ptr == NULL)
 362         {
 363                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
 364                                 ident, seq);
 365         }
 366
 367         return (ptr);
 368 }
 369
 370 static int ping_receive_one (int fd, pinghost_t *ph, struct timeval *now)
 371 {
 372         char   buffer[4096];
 373         size_t buffer_len;
 374
 375         struct timeval diff;
 376
 377         pinghost_t *host = NULL;
 378
 379         struct sockaddr_storage sa;
 380         socklen_t               sa_len;
 381
 382         sa_len = sizeof (sa);
 383
 384         buffer_len = recvfrom (fd, buffer, sizeof (buffer), 0,
 385                         (struct sockaddr *) &sa, &sa_len);
 386         if (buffer_len == -1)
 387         {
 388                 dprintf ("recvfrom: %s\n", strerror (errno));
 389                 return (-1);
 390         }
 391
 392         dprintf ("Read %u bytes from fd = %i\n", (unsigned int) buffer_len, fd);
 393
 394         if (sa.ss_family == AF_INET)
 395         {
 396                 if ((host = ping_receive_ipv4 (ph, buffer, buffer_len)) == NULL)
 397                         return (-1);
 398         }
 399         else if (sa.ss_family == AF_INET6)
 400         {
 401                 if ((host = ping_receive_ipv6 (ph, buffer, buffer_len)) == NULL)
 402                         return (-1);
 403         }
 404
 405         dprintf ("rcvd: %12i.%06i\n",
 406                         (int) now->tv_sec,
 407                         (int) now->tv_usec);
 408         dprintf ("sent: %12i.%06i\n",
 409                         (int) host->timer->tv_sec,
 410                         (int) host->timer->tv_usec);
 411
 412         if (ping_timeval_sub (now, host->timer, &diff) < 0)
 413         {
 414                 timerclear (host->timer);
 415                 return (-1);
 416         }
 417
 418         dprintf ("diff: %12i.%06i\n",
 419                         (int) diff.tv_sec,
 420                         (int) diff.tv_usec);
 421
 422         host->latency  = ((double) diff.tv_usec) / 1000.0;
 423         host->latency += ((double) diff.tv_sec)  * 1000.0;
 424
 425         timerclear (host->timer);
 426
 427         return (0);
 428 }
 429
 430 static int ping_receive_all (pingobj_t *obj)
 431 {
 432         fd_set readfds;
 433         int num_readfds;
 434         int max_readfds;
 435
 436         pinghost_t *ph;
 437         pinghost_t *ptr;
 438
 439         struct timeval endtime;
 440         struct timeval nowtime;
 441         struct timeval timeout;
 442         int status;
 443
 444         int ret;
 445
 446         ph = obj->head;
 447         ret = 0;
 448
 449         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 450                 ptr->latency = -1.0;
 451
 452         if (gettimeofday (&nowtime, NULL) == -1)
 453         {
 454                 ping_set_error (obj, "gettimeofday", strerror (errno));
 455                 return (-1);
 456         }
 457
 458         /* Set up timeout */
 459         timeout.tv_sec = (time_t) obj->timeout;
 460         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 461
 462         dprintf ("Set timeout to %i.%06i seconds\n",
 463                         (int) timeout.tv_sec,
 464                         (int) timeout.tv_usec);
 465
 466         ping_timeval_add (&nowtime, &timeout, &endtime);
 467
 468         while (1)
 469         {
 470                 FD_ZERO (&readfds);
 471                 num_readfds =  0;
 472                 max_readfds = -1;
 473
 474                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 475                 {
 476                         if (!timerisset (ptr->timer))
 477                                 continue;
 478
 479                         FD_SET (ptr->fd, &readfds);
 480                         num_readfds++;
 481
 482                         if (max_readfds < ptr->fd)
 483                                 max_readfds = ptr->fd;
 484                 }
 485
 486                 if (num_readfds == 0)
 487                         break;
 488
 489                 if (gettimeofday (&nowtime, NULL) == -1)
 490                 {
 491                         ping_set_error (obj, "gettimeofday", strerror (errno));
 492                         return (-1);
 493                 }
 494
 495                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 496                         break;
 497
 498                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_readfds,
 499                                 (int) timeout.tv_sec,
 500                                 (int) timeout.tv_usec);
 501
 502                 status = select (max_readfds + 1, &readfds, NULL, NULL, &timeout);
 503
 504                 if (gettimeofday (&nowtime, NULL) == -1)
 505                 {
 506                         ping_set_error (obj, "gettimeofday", strerror (errno));
 507                         return (-1);
 508                 }
 509
 510                 if ((status == -1) && (errno == EINTR))
 511                 {
 512                         dprintf ("select was interrupted by signal..\n");
 513                         continue;
 514                 }
 515                 else if (status < 0)
 516                 {
 517                         dprintf ("select: %s\n", strerror (errno));
 518                         break;
 519                 }
 520                 else if (status == 0)
 521                 {
 522                         dprintf ("select timed out\n");
 523                         break;
 524                 }
 525
 526                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 527                 {
 528                         if (FD_ISSET (ptr->fd, &readfds))
 529                                 if (ping_receive_one (ptr->fd, ph, &nowtime) == 0)
 530                                         ret++;
 531                 }
 532         } /* while (1) */
 533
 534         return (ret);
 535 }
 536
 537 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 538  * Sending functions:                                                        *
 539  *                                                                           *
 540  * ping_send_all                                                             *
 541  * +-> ping_send_one_ipv4                                                    *
 542  * `-> ping_send_one_ipv6                                                    *
 543  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 544 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 545                 const void *buf, size_t buflen)
 546 {
 547         ssize_t ret;
 548
 549         if (gettimeofday (ph->timer, NULL) == -1)
 550         {
 551                 timerclear (ph->timer);
 552                 return (-1);
 553         }
 554
 555         ret = sendto (ph->fd, buf, buflen, 0,
 556                         (struct sockaddr *) ph->addr, ph->addrlen);
 557
 558         if (ret < 0)
 559         {
 560 #if defined(EHOSTUNREACH)
 561                 if (errno == EHOSTUNREACH)
 562                         return (0);
 563 #endif
 564 #if defined(ENETUNREACH)
 565                 if (errno == ENETUNREACH)
 566                         return (0);
 567 #endif
 568                 ping_set_error (obj, "sendto", strerror (errno));
 569         }
 570
 571         return (ret);
 572 }
 573
 574 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 575 {
 576         struct icmp *icmp4;
 577         int status;
 578
 579         char buf[4096];
 580         int  buflen;
 581
 582         char *data;
 583         int   datalen;
 584
 585         dprintf ("ph->hostname = %s\n", ph->hostname);
 586
 587         memset (buf, '\0', sizeof (buf));
 588         icmp4 = (struct icmp *) buf;
 589         data  = (char *) (icmp4 + 1);
 590
 591         icmp4->icmp_type  = ICMP_ECHO;
 592         icmp4->icmp_code  = 0;
 593         icmp4->icmp_cksum = 0;
 594         icmp4->icmp_id    = htons (ph->ident);
 595         icmp4->icmp_seq   = htons (ph->sequence);
 596
 597         buflen = 4096 - sizeof (struct icmp);
 598         strncpy (data, ph->data, buflen);
 599         datalen = strlen (data);
 600
 601         buflen = datalen + sizeof (struct icmp);
 602
 603         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 604
 605         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 606
 607         status = ping_sendto (obj, ph, buf, buflen);
 608         if (status < 0)
 609         {
 610                 perror ("ping_sendto");
 611                 return (-1);
 612         }
 613
 614         dprintf ("sendto: status = %i\n", status);
 615
 616         return (0);
 617 }
 618
 619 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 620 {
 621         struct icmp6_hdr *icmp6;
 622         int status;
 623
 624         char buf[4096];
 625         int  buflen;
 626
 627         char *data;
 628         int   datalen;
 629
 630         dprintf ("ph->hostname = %s\n", ph->hostname);
 631
 632         memset (buf, '\0', sizeof (buf));
 633         icmp6 = (struct icmp6_hdr *) buf;
 634         data  = (char *) (icmp6 + 1);
 635
 636         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 637         icmp6->icmp6_code  = 0;
 638         /* The checksum will be calculated by the TCP/IP stack.  */
 639         /* FIXME */
 640         icmp6->icmp6_cksum = 0;
 641         icmp6->icmp6_id    = htons (ph->ident);
 642         icmp6->icmp6_seq   = htons (ph->sequence);
 643
 644         buflen = 4096 - sizeof (struct icmp6_hdr);
 645         strncpy (data, ph->data, buflen);
 646         datalen = strlen (data);
 647
 648         buflen = datalen + sizeof (struct icmp6_hdr);
 649
 650         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 651
 652         status = ping_sendto (obj, ph, buf, buflen);
 653         if (status < 0)
 654         {
 655                 perror ("ping_sendto");
 656                 return (-1);
 657         }
 658
 659         dprintf ("sendto: status = %i\n", status);
 660
 661         return (0);
 662 }
 663
 664 static int ping_send_all (pingobj_t *obj)
 665 {
 666         pinghost_t *ph;
 667         pinghost_t *ptr;
 668
 669         int ret;
 670
 671         ret = 0;
 672         ph = obj->head;
 673
 674         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 675         {
 676                 /* start timer.. The GNU `ping6' starts the timer before
 677                  * sending the packet, so I will do that too */
 678                 if (gettimeofday (ptr->timer, NULL) == -1)
 679                 {
 680                         dprintf ("gettimeofday: %s\n", strerror (errno));
 681                         timerclear (ptr->timer);
 682                         ret--;
 683                         continue;
 684                 }
 685                 else
 686                 {
 687                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 688                 }
 689
 690                 if (ptr->addrfamily == AF_INET6)
 691                 {
 692                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 693                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 694                         {
 695                                 timerclear (ptr->timer);
 696                                 ret--;
 697                                 continue;
 698                         }
 699                 }
 700                 else if (ptr->addrfamily == AF_INET)
 701                 {
 702                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 703                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 704                         {
 705                                 timerclear (ptr->timer);
 706                                 ret--;
 707                                 continue;
 708                         }
 709                 }
 710                 else /* this should not happen */
 711                 {
 712                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 713                         timerclear (ptr->timer);
 714                         ret--;
 715                         continue;
 716                 }
 717
 718                 ptr->sequence++;
 719         }
 720
 721         return (ret);
 722 }
 723
 724 /*
 725  * Set the TTL of a socket protocol independently.
 726  */
 727 static int ping_set_ttl (pinghost_t *ph, int ttl)
 728 {
 729         int ret = -2;
 730
 731         if (ph->addrfamily == AF_INET)
 732         {
 733                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL, &ttl, sizeof (ttl));
 734         }
 735         else if (ph->addrfamily == AF_INET6)
 736         {
 737                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof (ttl));
 738         }
 739
 740         return (ret);
 741 }
 742
 743 static int ping_get_ident (void)
 744 {
 745         int fd;
 746         static int did_seed = 0;
 747
 748         int retval;
 749
 750         if (did_seed == 0)
 751         {
 752                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 753                 {
 754                         unsigned int seed;
 755
 756                         if (read (fd, &seed, sizeof (seed)) != -1)
 757                         {
 758                                 did_seed = 1;
 759                                 dprintf ("Random seed: %i\n", seed);
 760                                 srandom (seed);
 761                         }
 762
 763                         close (fd);
 764                 }
 765                 else
 766                 {
 767                         dprintf ("open (/dev/urandom): %s\n", strerror (errno));
 768                 }
 769         }
 770
 771         retval = (int) random ();
 772
 773         dprintf ("Random number: %i\n", retval);
 774
 775         return (retval);
 776 }
 777
 778 static pinghost_t *ping_alloc (void)
 779 {
 780         pinghost_t *ph;
 781         size_t      ph_size;
 782
 783         ph_size = sizeof (pinghost_t)
 784                 + sizeof (struct sockaddr_storage)
 785                 + sizeof (struct timeval);
 786
 787         ph = (pinghost_t *) malloc (ph_size);
 788         if (ph == NULL)
 789                 return (NULL);
 790
 791         memset (ph, '\0', ph_size);
 792
 793         ph->timer   = (struct timeval *) (ph + 1);
 794         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
 795
 796         ph->addrlen = sizeof (struct sockaddr_storage);
 797         ph->fd      = -1;
 798         ph->latency = -1.0;
 799         ph->ident   = ping_get_ident () & 0xFFFF;
 800
 801         return (ph);
 802 }
 803
 804 static void ping_free (pinghost_t *ph)
 805 {
 806         if (ph->fd >= 0)
 807                 close (ph->fd);
 808
 809         if (ph->hostname != NULL)
 810                 free (ph->hostname);
 811
 812         if (ph->data != NULL)
 813                 free (ph->data);
 814
 815         free (ph);
 816 }
 817
 818 /*
 819  * public methods
 820  */
 821 const char *ping_get_error (pingobj_t *obj)
 822 {
 823         return (obj->errmsg);
 824 }
 825
 826 pingobj_t *ping_construct (void)
 827 {
 828         pingobj_t *obj;
 829
 830         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
 831                 return (NULL);
 832         memset (obj, '\0', sizeof (pingobj_t));
 833
 834         obj->timeout    = PING_DEF_TIMEOUT;
 835         obj->ttl        = PING_DEF_TTL;
 836         obj->addrfamily = PING_DEF_AF;
 837         obj->data       = strdup (PING_DEF_DATA);
 838
 839         return (obj);
 840 }
 841
 842 void ping_destroy (pingobj_t *obj)
 843 {
 844         pinghost_t *current;
 845         pinghost_t *next;
 846
 847         current = obj->head;
 848         next = NULL;
 849
 850         while (current != NULL)
 851         {
 852                 next = current->next;
 853                 ping_free (current);
 854                 current = next;
 855         }
 856
 857         if (obj->data != NULL)
 858                 free (obj->data);
 859
 860         if (obj->srcaddr != NULL)
 861                 free (obj->srcaddr);
 862
 863         free (obj);
 864
 865         return;
 866 }
 867
 868 int ping_setopt (pingobj_t *obj, int option, void *value)
 869 {
 870         int ret = 0;
 871
 872         switch (option)
 873         {
 874                 case PING_OPT_TIMEOUT:
 875                         obj->timeout = *((double *) value);
 876                         if (obj->timeout < 0.0)
 877                         {
 878                                 obj->timeout = PING_DEF_TIMEOUT;
 879                                 ret = -1;
 880                         }
 881                         break;
 882
 883                 case PING_OPT_TTL:
 884                         obj->ttl = *((int *) value);
 885                         if ((obj->ttl < 1) || (obj->ttl > 255))
 886                         {
 887                                 obj->ttl = PING_DEF_TTL;
 888                                 ret = -1;
 889                         }
 890                         break;
 891
 892                 case PING_OPT_AF:
 893                         obj->addrfamily = *((int *) value);
 894                         if ((obj->addrfamily != AF_UNSPEC)
 895                                         && (obj->addrfamily != AF_INET)
 896                                         && (obj->addrfamily != AF_INET6))
 897                         {
 898                                 obj->addrfamily = PING_DEF_AF;
 899                                 ret = -1;
 900                         }
 901                         if (obj->srcaddr != NULL)
 902                         {
 903                                 free (obj->srcaddr);
 904                                 obj->srcaddr = NULL;
 905                         }
 906                         break;
 907
 908                 case PING_OPT_DATA:
 909                         if (obj->data != NULL)
 910                         {
 911                                 free (obj->data);
 912                                 obj->data = NULL;
 913                         }
 914                         obj->data = strdup ((const char *) value);
 915                         break;
 916
 917                 case PING_OPT_SOURCE:
 918                 {
 919                         char            *hostname = (char *) value;
 920                         struct addrinfo  ai_hints;
 921                         struct addrinfo *ai_list;
 922                         int              status;
 923 #if WITH_DEBUG
 924                         if (obj->addrfamily != AF_UNSPEC)
 925                         {
 926                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
 927                         }
 928 #endif
 929                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
 930                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
 931 #if defined(AI_ADDRCONFIG)
 932                         ai_hints.ai_flags = AI_ADDRCONFIG;
 933 #endif
 934                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
 935                         if (status != 0)
 936                         {
 937                                 ping_set_error (obj, "getaddrinfo",
 938                                                 status == EAI_SYSTEM
 939                                                 ? strerror (errno)
 940                                                 : gai_strerror (status));
 941                                 ret = -1;
 942                                 break;
 943                         }
 944 #if WITH_DEBUG
 945                         if (ai_list->ai_next != NULL)
 946                         {
 947                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
 948                         }
 949 #endif
 950                         if (obj->srcaddr == NULL)
 951                         {
 952                                 obj->srcaddrlen = 0;
 953                                 obj->srcaddr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage));
 954                                 if (obj->srcaddr == NULL)
 955                                 {
 956                                         ping_set_error (obj, "malloc",
 957                                                         strerror (errno));
 958                                         ret = -1;
 959                                         freeaddrinfo (ai_list);
 960                                         break;
 961                                 }
 962                         }
 963                         memset ((void *) obj->srcaddr, '\0', sizeof (struct sockaddr_storage));
 964                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
 965                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
 966                                         ai_list->ai_addrlen);
 967                         obj->srcaddrlen = ai_list->ai_addrlen;
 968                         obj->addrfamily = ai_list->ai_family;
 969
 970                         freeaddrinfo (ai_list);
 971                 } /* case PING_OPT_SOURCE */
 972                 break;
 973
 974                 default:
 975                         ret = -2;
 976         } /* switch (option) */
 977
 978         return (ret);
 979 } /* int ping_setopt */
 980
 981
 982 int ping_send (pingobj_t *obj)
 983 {
 984         int ret;
 985
 986         if (ping_send_all (obj) < 0)
 987                 return (-1);
 988
 989         if ((ret = ping_receive_all (obj)) < 0)
 990                 return (-2);
 991
 992         return (ret);
 993 }
 994
 995 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
 996 {
 997         while (ph != NULL)
 998         {
 999                 if (strcasecmp (ph->hostname, host) == 0)
1000                         break;
1001
1002                 ph = ph->next;
1003         }
1004
1005         return (ph);
1006 }
1007
1008 int ping_host_add (pingobj_t *obj, const char *host)
1009 {
1010         pinghost_t *ph;
1011
1012         struct sockaddr_storage sockaddr;
1013         socklen_t               sockaddr_len;
1014
1015         struct addrinfo  ai_hints;
1016         struct addrinfo *ai_list, *ai_ptr;
1017         int              ai_return;
1018
1019         dprintf ("host = %s\n", host);
1020
1021         if (ping_host_search (obj->head, host) != NULL)
1022                 return (0);
1023
1024         memset (&ai_hints, '\0', sizeof (ai_hints));
1025         ai_hints.ai_flags     = 0;
1026 #ifdef AI_ADDRCONFIG
1027         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1028 #endif
1029 #ifdef AI_CANONNAME
1030         ai_hints.ai_flags    |= AI_CANONNAME;
1031 #endif
1032         ai_hints.ai_family    = obj->addrfamily;
1033         ai_hints.ai_socktype  = SOCK_RAW;
1034
1035         if ((ph = ping_alloc ()) == NULL)
1036         {
1037                 dprintf ("Out of memory!\n");
1038                 return (-1);
1039         }
1040
1041         if ((ph->hostname = strdup (host)) == NULL)
1042         {
1043                 dprintf ("Out of memory!\n");
1044                 ping_set_error (obj, "strdup", strerror (errno));
1045                 ping_free (ph);
1046                 return (-1);
1047         }
1048
1049         /* obj->data is not garuanteed to be != NULL */
1050         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1051         {
1052                 dprintf ("Out of memory!\n");
1053                 ping_set_error (obj, "strdup", strerror (errno));
1054                 ping_free (ph);
1055                 return (-1);
1056         }
1057
1058         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1059         {
1060                 dprintf ("getaddrinfo failed\n");
1061                 ping_set_error (obj, "getaddrinfo",
1062                                 (ai_return == EAI_SYSTEM)
1063                                 ? strerror (errno)
1064                                 : gai_strerror (ai_return));
1065                 ping_free (ph);
1066                 return (-1);
1067         }
1068
1069         if (ai_list == NULL)
1070                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1071
1072         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1073         {
1074                 ph->fd = -1;
1075
1076                 sockaddr_len = sizeof (sockaddr);
1077                 memset (&sockaddr, '\0', sockaddr_len);
1078
1079                 if (ai_ptr->ai_family == AF_INET)
1080                 {
1081                         struct sockaddr_in *si;
1082
1083                         si = (struct sockaddr_in *) &sockaddr;
1084                         si->sin_family = AF_INET;
1085                         si->sin_port   = htons (ph->ident);
1086                         si->sin_addr.s_addr = htonl (INADDR_ANY);
1087
1088                         ai_ptr->ai_socktype = SOCK_RAW;
1089                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1090                 }
1091                 else if (ai_ptr->ai_family == AF_INET6)
1092                 {
1093                         struct sockaddr_in6 *si;
1094
1095                         si = (struct sockaddr_in6 *) &sockaddr;
1096                         si->sin6_family = AF_INET6;
1097                         si->sin6_port   = htons (ph->ident);
1098                         si->sin6_addr   = in6addr_any;
1099
1100                         ai_ptr->ai_socktype = SOCK_RAW;
1101                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1102                 }
1103                 else
1104                 {
1105                         char errmsg[PING_ERRMSG_LEN];
1106
1107                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1108                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1109
1110                         dprintf (errmsg);
1111                         ping_set_error (obj, "getaddrinfo", errmsg);
1112                         continue;
1113                 }
1114
1115                 /* TODO: Move this to a static function `ping_open_socket' and
1116                  * call it whenever the socket dies. */
1117                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1118                 if (ph->fd == -1)
1119                 {
1120                         dprintf ("socket: %s\n", strerror (errno));
1121                         ping_set_error (obj, "socket", strerror (errno));
1122                         continue;
1123                 }
1124
1125                 if (obj->srcaddr != NULL)
1126                 {
1127                         assert (obj->srcaddrlen > 0);
1128                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1129
1130                         if (bind (ph->fd, (struct sockaddr *) obj->srcaddr, obj->srcaddrlen) == -1)
1131                         {
1132                                 dprintf ("bind: %s\n", strerror (errno));
1133                                 ping_set_error (obj, "bind", strerror (errno));
1134                                 close (ph->fd);
1135                                 ph->fd = -1;
1136                                 continue;
1137                         }
1138                 }
1139
1140                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1141                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1142                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1143                 ph->addrlen = ai_ptr->ai_addrlen;
1144                 ph->addrfamily = ai_ptr->ai_family;
1145
1146 #ifdef AI_CANONNAME
1147                 if ((ai_ptr->ai_canonname != NULL)
1148                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1149                 {
1150                         char *old_hostname;
1151
1152                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1153                                         ph->hostname, ai_ptr->ai_canonname);
1154
1155                         old_hostname = ph->hostname;
1156                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1157                         {
1158                                 /* strdup failed, falling back to old hostname */
1159                                 ph->hostname = old_hostname;
1160                         }
1161                         else if (old_hostname != NULL)
1162                         {
1163                                 free (old_hostname);
1164                         }
1165                 }
1166 #endif /* AI_CANONNAME */
1167
1168                 break;
1169         }
1170
1171         freeaddrinfo (ai_list);
1172
1173         if (ph->fd < 0)
1174         {
1175                 ping_free (ph);
1176                 return (-1);
1177         }
1178
1179         /*
1180          * Adding in the front is much easier, but then the iterator will
1181          * return the host that was added last as first host. That's just not
1182          * nice. -octo
1183          */
1184         if (obj->head == NULL)
1185         {
1186                 obj->head = ph;
1187         }
1188         else
1189         {
1190                 pinghost_t *hptr;
1191
1192                 hptr = obj->head;
1193                 while (hptr->next != NULL)
1194                         hptr = hptr->next;
1195
1196                 assert ((hptr != NULL) && (hptr->next == NULL));
1197                 hptr->next = ph;
1198         }
1199
1200         ping_set_ttl (ph, obj->ttl);
1201
1202         return (0);
1203 }
1204
1205 int ping_host_remove (pingobj_t *obj, const char *host)
1206 {
1207         pinghost_t *pre, *cur;
1208
1209         pre = NULL;
1210         cur = obj->head;
1211
1212         while (cur != NULL)
1213         {
1214                 if (strcasecmp (host, cur->hostname) == 0)
1215                         break;
1216
1217                 pre = cur;
1218                 cur = cur->next;
1219         }
1220
1221         if (cur == NULL)
1222         {
1223                 ping_set_error (obj, "ping_host_remove", "Host not found");
1224                 return (-1);
1225         }
1226
1227         if (pre == NULL)
1228                 obj->head = cur->next;
1229         else
1230                 pre->next = cur->next;
1231
1232         ping_free (cur);
1233
1234         return (0);
1235 }
1236
1237 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1238 {
1239         return ((pingobj_iter_t *) obj->head);
1240 }
1241
1242 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1243 {
1244         return ((pingobj_iter_t *) iter->next);
1245 }
1246
1247 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1248                 void *buffer, size_t *buffer_len)
1249 {
1250         int ret = EINVAL;
1251
1252         size_t orig_buffer_len = *buffer_len;
1253
1254         switch (info)
1255         {
1256                 case PING_INFO_HOSTNAME:
1257                         ret = ENOMEM;
1258                         *buffer_len = strlen (iter->hostname);
1259                         if (orig_buffer_len <= *buffer_len)
1260                                 break;
1261                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1262                          * will copy `*buffer_len' and pad the rest of
1263                          * `buffer' with null-bytes */
1264                         strncpy (buffer, iter->hostname, orig_buffer_len);
1265                         ret = 0;
1266                         break;
1267
1268                 case PING_INFO_ADDRESS:
1269                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1270                                         iter->addrlen,
1271                                         (char *) buffer,
1272                                         *buffer_len,
1273                                         NULL, 0,
1274                                         NI_NUMERICHOST);
1275                         if (ret != 0)
1276                         {
1277                                 if ((ret == EAI_MEMORY)
1278 #ifdef EAI_OVERFLOW
1279                                                 || (ret == EAI_OVERFLOW)
1280 #endif
1281                                    )
1282                                         ret = ENOMEM;
1283                                 else if (ret == EAI_SYSTEM)
1284                                         /* XXX: Not thread-safe! */
1285                                         ret = errno;
1286                                 else
1287                                         ret = EINVAL;
1288                         }
1289                         break;
1290
1291                 case PING_INFO_FAMILY:
1292                         ret = ENOMEM;
1293                         *buffer_len = sizeof (int);
1294                         if (orig_buffer_len < sizeof (int))
1295                                 break;
1296                         *((int *) buffer) = iter->addrfamily;
1297                         ret = 0;
1298                         break;
1299
1300                 case PING_INFO_LATENCY:
1301                         ret = ENOMEM;
1302                         *buffer_len = sizeof (double);
1303                         if (orig_buffer_len < sizeof (double))
1304                                 break;
1305                         *((double *) buffer) = iter->latency;
1306                         ret = 0;
1307                         break;
1308
1309                 case PING_INFO_SEQUENCE:
1310                         ret = ENOMEM;
1311                         *buffer_len = sizeof (unsigned int);
1312                         if (orig_buffer_len < sizeof (unsigned int))
1313                                 break;
1314                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1315                         ret = 0;
1316                         break;
1317
1318                 case PING_INFO_IDENT:
1319                         ret = ENOMEM;
1320                         *buffer_len = sizeof (uint16_t);
1321                         if (orig_buffer_len < sizeof (uint16_t))
1322                                 break;
1323                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1324                         ret = 0;
1325                         break;
1326
1327                 case PING_INFO_DATA:
1328                         ret = ENOMEM;
1329                         *buffer_len = strlen (iter->data);
1330                         if (orig_buffer_len < *buffer_len)
1331                                 break;
1332                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1333                         ret = 0;
1334                         break;
1335         }
1336
1337         return (ret);
1338 }
1339
1340 void *ping_iterator_get_context (pingobj_iter_t *iter)
1341 {
1342         return (iter->context);
1343 }
1344
1345 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1346 {
1347         iter->context = context;
1348 }