src/liboping.c

   1 /**
   2  * Object oriented C module to send ICMP and ICMPv6 `echo's.
   3  * Copyright (C) 2006-2008  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 <stdint.h>
  29 # include <inttypes.h>
  30 # include <errno.h>
  31 # include <assert.h>
  32 #else
  33 # error "You don't have the standard C99 header files installed"
  34 #endif /* STDC_HEADERS */
  35
  36 #if HAVE_UNISTD_H
  37 # include <unistd.h>
  38 #endif
  39
  40 #if HAVE_FCNTL_H
  41 # include <fcntl.h>
  42 #endif
  43 #if HAVE_SYS_TYPES_H
  44 # include <sys/types.h>
  45 #endif
  46 #if HAVE_SYS_STAT_H
  47 # include <sys/stat.h>
  48 #endif
  49
  50 #if TIME_WITH_SYS_TIME
  51 # include <sys/time.h>
  52 # include <time.h>
  53 #else
  54 # if HAVE_SYS_TIME_H
  55 #  include <sys/time.h>
  56 # else
  57 #  include <time.h>
  58 # endif
  59 #endif
  60
  61 #if HAVE_SYS_SOCKET_H
  62 # include <sys/socket.h>
  63 #endif
  64 #if HAVE_NETDB_H
  65 # include <netdb.h>
  66 #endif
  67
  68 #if HAVE_NETINET_IN_SYSTM_H
  69 # include <netinet/in_systm.h>
  70 #endif
  71 #if HAVE_NETINET_IN_H
  72 # include <netinet/in.h>
  73 #endif
  74 #if HAVE_NETINET_IP_H
  75 # include <netinet/ip.h>
  76 #endif
  77 #if HAVE_NETINET_IP_ICMP_H
  78 # include <netinet/ip_icmp.h>
  79 #endif
  80 #ifdef HAVE_NETINET_IP_VAR_H
  81 # include <netinet/ip_var.h>
  82 #endif
  83 #if HAVE_NETINET_IP6_H
  84 # include <netinet/ip6.h>
  85 #endif
  86 #if HAVE_NETINET_ICMP6_H
  87 # include <netinet/icmp6.h>
  88 #endif
  89
  90 #include "oping.h"
  91
  92 #if WITH_DEBUG
  93 # define dprintf(...) printf ("%s[%4i]: %-20s: ", __FILE__, __LINE__, __FUNCTION__); printf (__VA_ARGS__)
  94 #else
  95 # define dprintf(...) /**/
  96 #endif
  97
  98 #define PING_ERRMSG_LEN 256
  99
 100 struct pinghost
 101 {
 102         /* username: name passed in by the user */
 103         char                    *username;
 104         /* hostname: name returned by the reverse lookup */
 105         char                    *hostname;
 106         struct sockaddr_storage *addr;
 107         socklen_t                addrlen;
 108         int                      addrfamily;
 109         int                      fd;
 110         int                      ident;
 111         int                      sequence;
 112         struct timeval          *timer;
 113         double                   latency;
 114         uint32_t                 dropped;
 115         char                    *data;
 116
 117         void                    *context;
 118
 119         struct pinghost         *next;
 120 };
 121
 122 struct pingobj
 123 {
 124         double                   timeout;
 125         int                      ttl;
 126         int                      addrfamily;
 127         char                    *data;
 128
 129         struct sockaddr_storage *srcaddr;
 130         socklen_t                srcaddrlen;
 131
 132         char                     errmsg[PING_ERRMSG_LEN];
 133
 134         pinghost_t              *head;
 135 };
 136
 137 /*
 138  * private (static) functions
 139  */
 140 static void ping_set_error (pingobj_t *obj, const char *function,
 141                 const char *message)
 142 {
 143         snprintf (obj->errmsg, PING_ERRMSG_LEN, "%s: %s", function, message);
 144         obj->errmsg[PING_ERRMSG_LEN - 1] = '\0';
 145 }
 146
 147 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
 148                 struct timeval *res)
 149 {
 150         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
 151         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
 152
 153         while (res->tv_usec > 1000000)
 154         {
 155                 res->tv_usec -= 1000000;
 156                 res->tv_sec++;
 157         }
 158
 159         return (0);
 160 }
 161
 162 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
 163                 struct timeval *res)
 164 {
 165
 166         if ((tv1->tv_sec < tv2->tv_sec)
 167                         || ((tv1->tv_sec == tv2->tv_sec)
 168                                 && (tv1->tv_usec < tv2->tv_usec)))
 169                 return (-1);
 170
 171         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
 172         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
 173
 174         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec > 0)));
 175
 176         while (res->tv_usec < 0)
 177         {
 178                 res->tv_usec += 1000000;
 179                 res->tv_sec--;
 180         }
 181
 182         return (0);
 183 }
 184
 185 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
 186 {
 187         uint32_t sum = 0;
 188         uint16_t ret = 0;
 189
 190         uint16_t *ptr;
 191
 192         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
 193                 sum += *ptr;
 194
 195         if (len == 1)
 196         {
 197                 *(char *) &ret = *(char *) ptr;
 198                 sum += ret;
 199         }
 200
 201         /* Do this twice to get all possible carries.. */
 202         sum = (sum >> 16) + (sum & 0xFFFF);
 203         sum = (sum >> 16) + (sum & 0xFFFF);
 204
 205         ret = ~sum;
 206
 207         return (ret);
 208 }
 209
 210 static pinghost_t *ping_receive_ipv4 (pinghost_t *ph, char *buffer, size_t buffer_len)
 211 {
 212         struct ip *ip_hdr;
 213         struct icmp *icmp_hdr;
 214
 215         size_t ip_hdr_len;
 216
 217         uint16_t recv_checksum;
 218         uint16_t calc_checksum;
 219
 220         uint16_t ident;
 221         uint16_t seq;
 222
 223         pinghost_t *ptr;
 224
 225         if (buffer_len < sizeof (struct ip))
 226                 return (NULL);
 227
 228         ip_hdr     = (struct ip *) buffer;
 229         ip_hdr_len = ip_hdr->ip_hl << 2;
 230
 231         if (buffer_len < ip_hdr_len)
 232                 return (NULL);
 233
 234         buffer     += ip_hdr_len;
 235         buffer_len -= ip_hdr_len;
 236
 237         if (buffer_len < sizeof (struct icmp))
 238                 return (NULL);
 239
 240         icmp_hdr = (struct icmp *) buffer;
 241         buffer     += sizeof (struct icmp);
 242         buffer_len -= sizeof (struct icmp);
 243
 244         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
 245         {
 246                 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
 247                 return (NULL);
 248         }
 249
 250         recv_checksum = icmp_hdr->icmp_cksum;
 251         icmp_hdr->icmp_cksum = 0;
 252         calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
 253                         sizeof (struct icmp) + buffer_len);
 254
 255         if (recv_checksum != calc_checksum)
 256         {
 257                 dprintf ("Checksum missmatch: Got 0x%04x, calculated 0x%04x\n",
 258                                 recv_checksum, calc_checksum);
 259                 return (NULL);
 260         }
 261
 262         ident = ntohs (icmp_hdr->icmp_id);
 263         seq   = ntohs (icmp_hdr->icmp_seq);
 264
 265         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 266         {
 267                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 268                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 269
 270                 if (ptr->addrfamily != AF_INET)
 271                         continue;
 272
 273                 if (!timerisset (ptr->timer))
 274                         continue;
 275
 276                 if (ptr->ident != ident)
 277                         continue;
 278
 279                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 280                         continue;
 281
 282                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
 283                                 ptr->hostname, ident, seq);
 284
 285                 break;
 286         }
 287
 288         if (ptr == NULL)
 289         {
 290                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
 291                                 ident, seq);
 292         }
 293
 294         return (ptr);
 295 }
 296
 297 #ifndef ICMP6_ECHO_REQUEST
 298 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
 299 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
 300 # else
 301 #  define ICMP6_ECHO_REQUEST 128
 302 # endif
 303 #endif
 304
 305 #ifndef ICMP6_ECHO_REPLY
 306 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
 307 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
 308 # else
 309 #  define ICMP6_ECHO_REPLY 129
 310 # endif
 311 #endif
 312
 313 static pinghost_t *ping_receive_ipv6 (pinghost_t *ph, char *buffer, size_t buffer_len)
 314 {
 315         struct icmp6_hdr *icmp_hdr;
 316
 317         uint16_t ident;
 318         uint16_t seq;
 319
 320         pinghost_t *ptr;
 321
 322         if (buffer_len < sizeof (struct icmp6_hdr))
 323                 return (NULL);
 324
 325         icmp_hdr = (struct icmp6_hdr *) buffer;
 326         buffer     += sizeof (struct icmp);
 327         buffer_len -= sizeof (struct icmp);
 328
 329         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 330         {
 331                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 332                 return (NULL);
 333         }
 334
 335         if (icmp_hdr->icmp6_code != 0)
 336         {
 337                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 338                 return (NULL);
 339         }
 340
 341         ident = ntohs (icmp_hdr->icmp6_id);
 342         seq   = ntohs (icmp_hdr->icmp6_seq);
 343
 344         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 345         {
 346                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 347                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 348
 349                 if (ptr->addrfamily != AF_INET6)
 350                         continue;
 351
 352                 if (!timerisset (ptr->timer))
 353                         continue;
 354
 355                 if (ptr->ident != ident)
 356                         continue;
 357
 358                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 359                         continue;
 360
 361                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
 362                                 ptr->hostname, ident, seq);
 363
 364                 break;
 365         }
 366
 367         if (ptr == NULL)
 368         {
 369                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
 370                                 ident, seq);
 371         }
 372
 373         return (ptr);
 374 }
 375
 376 static int ping_receive_one (int fd, pinghost_t *ph, struct timeval *now)
 377 {
 378         char   buffer[4096];
 379         size_t buffer_len;
 380
 381         struct timeval diff;
 382
 383         pinghost_t *host = NULL;
 384
 385         struct sockaddr_storage sa;
 386         socklen_t               sa_len;
 387
 388         sa_len = sizeof (sa);
 389
 390         buffer_len = recvfrom (fd, buffer, sizeof (buffer), 0,
 391                         (struct sockaddr *) &sa, &sa_len);
 392         if (buffer_len == -1)
 393         {
 394                 dprintf ("recvfrom: %s\n", strerror (errno));
 395                 return (-1);
 396         }
 397
 398         dprintf ("Read %u bytes from fd = %i\n", (unsigned int) buffer_len, fd);
 399
 400         if (sa.ss_family == AF_INET)
 401         {
 402                 if ((host = ping_receive_ipv4 (ph, buffer, buffer_len)) == NULL)
 403                         return (-1);
 404         }
 405         else if (sa.ss_family == AF_INET6)
 406         {
 407                 if ((host = ping_receive_ipv6 (ph, buffer, buffer_len)) == NULL)
 408                         return (-1);
 409         }
 410
 411         dprintf ("rcvd: %12i.%06i\n",
 412                         (int) now->tv_sec,
 413                         (int) now->tv_usec);
 414         dprintf ("sent: %12i.%06i\n",
 415                         (int) host->timer->tv_sec,
 416                         (int) host->timer->tv_usec);
 417
 418         if (ping_timeval_sub (now, host->timer, &diff) < 0)
 419         {
 420                 timerclear (host->timer);
 421                 return (-1);
 422         }
 423
 424         dprintf ("diff: %12i.%06i\n",
 425                         (int) diff.tv_sec,
 426                         (int) diff.tv_usec);
 427
 428         host->latency  = ((double) diff.tv_usec) / 1000.0;
 429         host->latency += ((double) diff.tv_sec)  * 1000.0;
 430
 431         timerclear (host->timer);
 432
 433         return (0);
 434 }
 435
 436 static int ping_receive_all (pingobj_t *obj)
 437 {
 438         fd_set readfds;
 439         int num_readfds;
 440         int max_readfds;
 441
 442         pinghost_t *ph;
 443         pinghost_t *ptr;
 444
 445         struct timeval endtime;
 446         struct timeval nowtime;
 447         struct timeval timeout;
 448         int status;
 449
 450         int ret;
 451
 452         ph = obj->head;
 453         ret = 0;
 454
 455         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 456                 ptr->latency = -1.0;
 457
 458         if (gettimeofday (&nowtime, NULL) == -1)
 459         {
 460                 ping_set_error (obj, "gettimeofday", strerror (errno));
 461                 return (-1);
 462         }
 463
 464         /* Set up timeout */
 465         timeout.tv_sec = (time_t) obj->timeout;
 466         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 467
 468         dprintf ("Set timeout to %i.%06i seconds\n",
 469                         (int) timeout.tv_sec,
 470                         (int) timeout.tv_usec);
 471
 472         ping_timeval_add (&nowtime, &timeout, &endtime);
 473
 474         while (1)
 475         {
 476                 FD_ZERO (&readfds);
 477                 num_readfds =  0;
 478                 max_readfds = -1;
 479
 480                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 481                 {
 482                         if (!timerisset (ptr->timer))
 483                                 continue;
 484
 485                         FD_SET (ptr->fd, &readfds);
 486                         num_readfds++;
 487
 488                         if (max_readfds < ptr->fd)
 489                                 max_readfds = ptr->fd;
 490                 }
 491
 492                 if (num_readfds == 0)
 493                         break;
 494
 495                 if (gettimeofday (&nowtime, NULL) == -1)
 496                 {
 497                         ping_set_error (obj, "gettimeofday", strerror (errno));
 498                         return (-1);
 499                 }
 500
 501                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 502                         break;
 503
 504                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_readfds,
 505                                 (int) timeout.tv_sec,
 506                                 (int) timeout.tv_usec);
 507
 508                 status = select (max_readfds + 1, &readfds, NULL, NULL, &timeout);
 509
 510                 if (gettimeofday (&nowtime, NULL) == -1)
 511                 {
 512                         ping_set_error (obj, "gettimeofday", strerror (errno));
 513                         return (-1);
 514                 }
 515
 516                 if ((status == -1) && (errno == EINTR))
 517                 {
 518                         dprintf ("select was interrupted by signal..\n");
 519                         continue;
 520                 }
 521                 else if (status < 0)
 522                 {
 523                         dprintf ("select: %s\n", strerror (errno));
 524                         break;
 525                 }
 526                 else if (status == 0)
 527                 {
 528                         dprintf ("select timed out\n");
 529                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 530                                 if (ptr->latency < 0.0)
 531                                         ptr->dropped++;
 532                         break;
 533                 }
 534
 535                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 536                 {
 537                         if (FD_ISSET (ptr->fd, &readfds))
 538                                 if (ping_receive_one (ptr->fd, ph, &nowtime) == 0)
 539                                         ret++;
 540                 }
 541         } /* while (1) */
 542
 543         return (ret);
 544 }
 545
 546 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 547  * Sending functions:                                                        *
 548  *                                                                           *
 549  * ping_send_all                                                             *
 550  * +-> ping_send_one_ipv4                                                    *
 551  * `-> ping_send_one_ipv6                                                    *
 552  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 553 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 554                 const void *buf, size_t buflen)
 555 {
 556         ssize_t ret;
 557
 558         if (gettimeofday (ph->timer, NULL) == -1)
 559         {
 560                 timerclear (ph->timer);
 561                 return (-1);
 562         }
 563
 564         ret = sendto (ph->fd, buf, buflen, 0,
 565                         (struct sockaddr *) ph->addr, ph->addrlen);
 566
 567         if (ret < 0)
 568         {
 569 #if defined(EHOSTUNREACH)
 570                 if (errno == EHOSTUNREACH)
 571                         return (0);
 572 #endif
 573 #if defined(ENETUNREACH)
 574                 if (errno == ENETUNREACH)
 575                         return (0);
 576 #endif
 577                 ping_set_error (obj, "sendto", strerror (errno));
 578         }
 579
 580         return (ret);
 581 }
 582
 583 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 584 {
 585         struct icmp *icmp4;
 586         int status;
 587
 588         char buf[4096];
 589         int  buflen;
 590
 591         char *data;
 592         int   datalen;
 593
 594         dprintf ("ph->hostname = %s\n", ph->hostname);
 595
 596         memset (buf, '\0', sizeof (buf));
 597         icmp4 = (struct icmp *) buf;
 598         data  = (char *) (icmp4 + 1);
 599
 600         icmp4->icmp_type  = ICMP_ECHO;
 601         icmp4->icmp_code  = 0;
 602         icmp4->icmp_cksum = 0;
 603         icmp4->icmp_id    = htons (ph->ident);
 604         icmp4->icmp_seq   = htons (ph->sequence);
 605
 606         buflen = 4096 - sizeof (struct icmp);
 607         strncpy (data, ph->data, buflen);
 608         datalen = strlen (data);
 609
 610         buflen = datalen + sizeof (struct icmp);
 611
 612         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 613
 614         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 615
 616         status = ping_sendto (obj, ph, buf, buflen);
 617         if (status < 0)
 618         {
 619                 perror ("ping_sendto");
 620                 return (-1);
 621         }
 622
 623         dprintf ("sendto: status = %i\n", status);
 624
 625         return (0);
 626 }
 627
 628 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 629 {
 630         struct icmp6_hdr *icmp6;
 631         int status;
 632
 633         char buf[4096];
 634         int  buflen;
 635
 636         char *data;
 637         int   datalen;
 638
 639         dprintf ("ph->hostname = %s\n", ph->hostname);
 640
 641         memset (buf, '\0', sizeof (buf));
 642         icmp6 = (struct icmp6_hdr *) buf;
 643         data  = (char *) (icmp6 + 1);
 644
 645         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 646         icmp6->icmp6_code  = 0;
 647         /* The checksum will be calculated by the TCP/IP stack.  */
 648         /* FIXME */
 649         icmp6->icmp6_cksum = 0;
 650         icmp6->icmp6_id    = htons (ph->ident);
 651         icmp6->icmp6_seq   = htons (ph->sequence);
 652
 653         buflen = 4096 - sizeof (struct icmp6_hdr);
 654         strncpy (data, ph->data, buflen);
 655         datalen = strlen (data);
 656
 657         buflen = datalen + sizeof (struct icmp6_hdr);
 658
 659         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 660
 661         status = ping_sendto (obj, ph, buf, buflen);
 662         if (status < 0)
 663         {
 664                 perror ("ping_sendto");
 665                 return (-1);
 666         }
 667
 668         dprintf ("sendto: status = %i\n", status);
 669
 670         return (0);
 671 }
 672
 673 static int ping_send_all (pingobj_t *obj)
 674 {
 675         pinghost_t *ph;
 676         pinghost_t *ptr;
 677
 678         int ret;
 679
 680         ret = 0;
 681         ph = obj->head;
 682
 683         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 684         {
 685                 /* start timer.. The GNU `ping6' starts the timer before
 686                  * sending the packet, so I will do that too */
 687                 if (gettimeofday (ptr->timer, NULL) == -1)
 688                 {
 689                         dprintf ("gettimeofday: %s\n", strerror (errno));
 690                         timerclear (ptr->timer);
 691                         ret--;
 692                         continue;
 693                 }
 694                 else
 695                 {
 696                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 697                 }
 698
 699                 if (ptr->addrfamily == AF_INET6)
 700                 {
 701                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 702                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 703                         {
 704                                 timerclear (ptr->timer);
 705                                 ret--;
 706                                 continue;
 707                         }
 708                 }
 709                 else if (ptr->addrfamily == AF_INET)
 710                 {
 711                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 712                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 713                         {
 714                                 timerclear (ptr->timer);
 715                                 ret--;
 716                                 continue;
 717                         }
 718                 }
 719                 else /* this should not happen */
 720                 {
 721                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 722                         timerclear (ptr->timer);
 723                         ret--;
 724                         continue;
 725                 }
 726
 727                 ptr->sequence++;
 728         }
 729
 730         return (ret);
 731 }
 732
 733 /*
 734  * Set the TTL of a socket protocol independently.
 735  */
 736 static int ping_set_ttl (pinghost_t *ph, int ttl)
 737 {
 738         int ret = -2;
 739
 740         if (ph->addrfamily == AF_INET)
 741         {
 742                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL, &ttl, sizeof (ttl));
 743         }
 744         else if (ph->addrfamily == AF_INET6)
 745         {
 746                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof (ttl));
 747         }
 748
 749         return (ret);
 750 }
 751
 752 static int ping_get_ident (void)
 753 {
 754         int fd;
 755         static int did_seed = 0;
 756
 757         int retval;
 758
 759         if (did_seed == 0)
 760         {
 761                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 762                 {
 763                         unsigned int seed;
 764
 765                         if (read (fd, &seed, sizeof (seed)) != -1)
 766                         {
 767                                 did_seed = 1;
 768                                 dprintf ("Random seed: %i\n", seed);
 769                                 srandom (seed);
 770                         }
 771
 772                         close (fd);
 773                 }
 774                 else
 775                 {
 776                         dprintf ("open (/dev/urandom): %s\n", strerror (errno));
 777                 }
 778         }
 779
 780         retval = (int) random ();
 781
 782         dprintf ("Random number: %i\n", retval);
 783
 784         return (retval);
 785 }
 786
 787 static pinghost_t *ping_alloc (void)
 788 {
 789         pinghost_t *ph;
 790         size_t      ph_size;
 791
 792         ph_size = sizeof (pinghost_t)
 793                 + sizeof (struct sockaddr_storage)
 794                 + sizeof (struct timeval);
 795
 796         ph = (pinghost_t *) malloc (ph_size);
 797         if (ph == NULL)
 798                 return (NULL);
 799
 800         memset (ph, '\0', ph_size);
 801
 802         ph->timer   = (struct timeval *) (ph + 1);
 803         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
 804
 805         ph->addrlen = sizeof (struct sockaddr_storage);
 806         ph->fd      = -1;
 807         ph->latency = -1.0;
 808         ph->dropped = 0;
 809         ph->ident   = ping_get_ident () & 0xFFFF;
 810
 811         return (ph);
 812 }
 813
 814 static void ping_free (pinghost_t *ph)
 815 {
 816         if (ph->fd >= 0)
 817                 close (ph->fd);
 818
 819         if (ph->username != NULL)
 820                 free (ph->username);
 821
 822         if (ph->hostname != NULL)
 823                 free (ph->hostname);
 824
 825         if (ph->data != NULL)
 826                 free (ph->data);
 827
 828         free (ph);
 829 }
 830
 831 /*
 832  * public methods
 833  */
 834 const char *ping_get_error (pingobj_t *obj)
 835 {
 836         return (obj->errmsg);
 837 }
 838
 839 pingobj_t *ping_construct (void)
 840 {
 841         pingobj_t *obj;
 842
 843         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
 844                 return (NULL);
 845         memset (obj, '\0', sizeof (pingobj_t));
 846
 847         obj->timeout    = PING_DEF_TIMEOUT;
 848         obj->ttl        = PING_DEF_TTL;
 849         obj->addrfamily = PING_DEF_AF;
 850         obj->data       = strdup (PING_DEF_DATA);
 851
 852         return (obj);
 853 }
 854
 855 void ping_destroy (pingobj_t *obj)
 856 {
 857         pinghost_t *current;
 858         pinghost_t *next;
 859
 860         current = obj->head;
 861         next = NULL;
 862
 863         while (current != NULL)
 864         {
 865                 next = current->next;
 866                 ping_free (current);
 867                 current = next;
 868         }
 869
 870         if (obj->data != NULL)
 871                 free (obj->data);
 872
 873         if (obj->srcaddr != NULL)
 874                 free (obj->srcaddr);
 875
 876         free (obj);
 877
 878         return;
 879 }
 880
 881 int ping_setopt (pingobj_t *obj, int option, void *value)
 882 {
 883         int ret = 0;
 884
 885         switch (option)
 886         {
 887                 case PING_OPT_TIMEOUT:
 888                         obj->timeout = *((double *) value);
 889                         if (obj->timeout < 0.0)
 890                         {
 891                                 obj->timeout = PING_DEF_TIMEOUT;
 892                                 ret = -1;
 893                         }
 894                         break;
 895
 896                 case PING_OPT_TTL:
 897                         obj->ttl = *((int *) value);
 898                         if ((obj->ttl < 1) || (obj->ttl > 255))
 899                         {
 900                                 obj->ttl = PING_DEF_TTL;
 901                                 ret = -1;
 902                         }
 903                         break;
 904
 905                 case PING_OPT_AF:
 906                         obj->addrfamily = *((int *) value);
 907                         if ((obj->addrfamily != AF_UNSPEC)
 908                                         && (obj->addrfamily != AF_INET)
 909                                         && (obj->addrfamily != AF_INET6))
 910                         {
 911                                 obj->addrfamily = PING_DEF_AF;
 912                                 ret = -1;
 913                         }
 914                         if (obj->srcaddr != NULL)
 915                         {
 916                                 free (obj->srcaddr);
 917                                 obj->srcaddr = NULL;
 918                         }
 919                         break;
 920
 921                 case PING_OPT_DATA:
 922                         if (obj->data != NULL)
 923                         {
 924                                 free (obj->data);
 925                                 obj->data = NULL;
 926                         }
 927                         obj->data = strdup ((const char *) value);
 928                         break;
 929
 930                 case PING_OPT_SOURCE:
 931                 {
 932                         char            *hostname = (char *) value;
 933                         struct addrinfo  ai_hints;
 934                         struct addrinfo *ai_list;
 935                         int              status;
 936 #if WITH_DEBUG
 937                         if (obj->addrfamily != AF_UNSPEC)
 938                         {
 939                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
 940                         }
 941 #endif
 942                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
 943                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
 944 #if defined(AI_ADDRCONFIG)
 945                         ai_hints.ai_flags = AI_ADDRCONFIG;
 946 #endif
 947                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
 948                         if (status != 0)
 949                         {
 950                                 ping_set_error (obj, "getaddrinfo",
 951 #if defined(EAI_SYSTEM)
 952                                                 (status == EAI_SYSTEM)
 953                                                 ? strerror (errno) :
 954 #endif
 955                                                 gai_strerror (status));
 956                                 ret = -1;
 957                                 break;
 958                         }
 959 #if WITH_DEBUG
 960                         if (ai_list->ai_next != NULL)
 961                         {
 962                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
 963                         }
 964 #endif
 965                         if (obj->srcaddr == NULL)
 966                         {
 967                                 obj->srcaddrlen = 0;
 968                                 obj->srcaddr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage));
 969                                 if (obj->srcaddr == NULL)
 970                                 {
 971                                         ping_set_error (obj, "malloc",
 972                                                         strerror (errno));
 973                                         ret = -1;
 974                                         freeaddrinfo (ai_list);
 975                                         break;
 976                                 }
 977                         }
 978                         memset ((void *) obj->srcaddr, '\0', sizeof (struct sockaddr_storage));
 979                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
 980                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
 981                                         ai_list->ai_addrlen);
 982                         obj->srcaddrlen = ai_list->ai_addrlen;
 983                         obj->addrfamily = ai_list->ai_family;
 984
 985                         freeaddrinfo (ai_list);
 986                 } /* case PING_OPT_SOURCE */
 987                 break;
 988
 989                 default:
 990                         ret = -2;
 991         } /* switch (option) */
 992
 993         return (ret);
 994 } /* int ping_setopt */
 995
 996
 997 int ping_send (pingobj_t *obj)
 998 {
 999         int ret;
1000
1001         if (ping_send_all (obj) < 0)
1002                 return (-1);
1003
1004         if ((ret = ping_receive_all (obj)) < 0)
1005                 return (-2);
1006
1007         return (ret);
1008 }
1009
1010 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1011 {
1012         while (ph != NULL)
1013         {
1014                 if (strcasecmp (ph->username, host) == 0)
1015                         break;
1016
1017                 ph = ph->next;
1018         }
1019
1020         return (ph);
1021 }
1022
1023 int ping_host_add (pingobj_t *obj, const char *host)
1024 {
1025         pinghost_t *ph;
1026
1027         struct sockaddr_storage sockaddr;
1028         socklen_t               sockaddr_len;
1029
1030         struct addrinfo  ai_hints;
1031         struct addrinfo *ai_list, *ai_ptr;
1032         int              ai_return;
1033
1034         dprintf ("host = %s\n", host);
1035
1036         if (ping_host_search (obj->head, host) != NULL)
1037                 return (0);
1038
1039         memset (&ai_hints, '\0', sizeof (ai_hints));
1040         ai_hints.ai_flags     = 0;
1041 #ifdef AI_ADDRCONFIG
1042         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1043 #endif
1044 #ifdef AI_CANONNAME
1045         ai_hints.ai_flags    |= AI_CANONNAME;
1046 #endif
1047         ai_hints.ai_family    = obj->addrfamily;
1048         ai_hints.ai_socktype  = SOCK_RAW;
1049
1050         if ((ph = ping_alloc ()) == NULL)
1051         {
1052                 dprintf ("Out of memory!\n");
1053                 return (-1);
1054         }
1055
1056         if ((ph->username = strdup (host)) == NULL)
1057         {
1058                 dprintf ("Out of memory!\n");
1059                 ping_set_error (obj, "strdup", strerror (errno));
1060                 ping_free (ph);
1061                 return (-1);
1062         }
1063
1064         if ((ph->hostname = strdup (host)) == NULL)
1065         {
1066                 dprintf ("Out of memory!\n");
1067                 ping_set_error (obj, "strdup", strerror (errno));
1068                 ping_free (ph);
1069                 return (-1);
1070         }
1071
1072         /* obj->data is not garuanteed to be != NULL */
1073         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1074         {
1075                 dprintf ("Out of memory!\n");
1076                 ping_set_error (obj, "strdup", strerror (errno));
1077                 ping_free (ph);
1078                 return (-1);
1079         }
1080
1081         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1082         {
1083                 dprintf ("getaddrinfo failed\n");
1084                 ping_set_error (obj, "getaddrinfo",
1085 #if defined(EAI_SYSTEM)
1086                                                 (ai_return == EAI_SYSTEM)
1087                                                 ? strerror (errno) :
1088 #endif
1089                                 gai_strerror (ai_return));
1090                 ping_free (ph);
1091                 return (-1);
1092         }
1093
1094         if (ai_list == NULL)
1095                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1096
1097         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1098         {
1099                 ph->fd = -1;
1100
1101                 sockaddr_len = sizeof (sockaddr);
1102                 memset (&sockaddr, '\0', sockaddr_len);
1103
1104                 if (ai_ptr->ai_family == AF_INET)
1105                 {
1106                         struct sockaddr_in *si;
1107
1108                         si = (struct sockaddr_in *) &sockaddr;
1109                         si->sin_family = AF_INET;
1110                         si->sin_port   = htons (ph->ident);
1111                         si->sin_addr.s_addr = htonl (INADDR_ANY);
1112
1113                         ai_ptr->ai_socktype = SOCK_RAW;
1114                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1115                 }
1116                 else if (ai_ptr->ai_family == AF_INET6)
1117                 {
1118                         struct sockaddr_in6 *si;
1119
1120                         si = (struct sockaddr_in6 *) &sockaddr;
1121                         si->sin6_family = AF_INET6;
1122                         si->sin6_port   = htons (ph->ident);
1123                         si->sin6_addr   = in6addr_any;
1124
1125                         ai_ptr->ai_socktype = SOCK_RAW;
1126                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1127                 }
1128                 else
1129                 {
1130                         char errmsg[PING_ERRMSG_LEN];
1131
1132                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1133                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1134
1135                         dprintf (errmsg);
1136                         ping_set_error (obj, "getaddrinfo", errmsg);
1137                         continue;
1138                 }
1139
1140                 /* TODO: Move this to a static function `ping_open_socket' and
1141                  * call it whenever the socket dies. */
1142                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1143                 if (ph->fd == -1)
1144                 {
1145                         dprintf ("socket: %s\n", strerror (errno));
1146                         ping_set_error (obj, "socket", strerror (errno));
1147                         continue;
1148                 }
1149
1150                 if (obj->srcaddr != NULL)
1151                 {
1152                         assert (obj->srcaddrlen > 0);
1153                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1154
1155                         if (bind (ph->fd, (struct sockaddr *) obj->srcaddr, obj->srcaddrlen) == -1)
1156                         {
1157                                 dprintf ("bind: %s\n", strerror (errno));
1158                                 ping_set_error (obj, "bind", strerror (errno));
1159                                 close (ph->fd);
1160                                 ph->fd = -1;
1161                                 continue;
1162                         }
1163                 }
1164
1165                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1166                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1167                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1168                 ph->addrlen = ai_ptr->ai_addrlen;
1169                 ph->addrfamily = ai_ptr->ai_family;
1170
1171 #ifdef AI_CANONNAME
1172                 if ((ai_ptr->ai_canonname != NULL)
1173                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1174                 {
1175                         char *old_hostname;
1176
1177                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1178                                         ph->hostname, ai_ptr->ai_canonname);
1179
1180                         old_hostname = ph->hostname;
1181                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1182                         {
1183                                 /* strdup failed, falling back to old hostname */
1184                                 ph->hostname = old_hostname;
1185                         }
1186                         else if (old_hostname != NULL)
1187                         {
1188                                 free (old_hostname);
1189                         }
1190                 }
1191 #endif /* AI_CANONNAME */
1192
1193                 break;
1194         }
1195
1196         freeaddrinfo (ai_list);
1197
1198         if (ph->fd < 0)
1199         {
1200                 ping_free (ph);
1201                 return (-1);
1202         }
1203
1204         /*
1205          * Adding in the front is much easier, but then the iterator will
1206          * return the host that was added last as first host. That's just not
1207          * nice. -octo
1208          */
1209         if (obj->head == NULL)
1210         {
1211                 obj->head = ph;
1212         }
1213         else
1214         {
1215                 pinghost_t *hptr;
1216
1217                 hptr = obj->head;
1218                 while (hptr->next != NULL)
1219                         hptr = hptr->next;
1220
1221                 assert ((hptr != NULL) && (hptr->next == NULL));
1222                 hptr->next = ph;
1223         }
1224
1225         ping_set_ttl (ph, obj->ttl);
1226
1227         return (0);
1228 }
1229
1230 int ping_host_remove (pingobj_t *obj, const char *host)
1231 {
1232         pinghost_t *pre, *cur;
1233
1234         pre = NULL;
1235         cur = obj->head;
1236
1237         while (cur != NULL)
1238         {
1239                 if (strcasecmp (host, cur->username) == 0)
1240                         break;
1241
1242                 pre = cur;
1243                 cur = cur->next;
1244         }
1245
1246         if (cur == NULL)
1247         {
1248                 ping_set_error (obj, "ping_host_remove", "Host not found");
1249                 return (-1);
1250         }
1251
1252         if (pre == NULL)
1253                 obj->head = cur->next;
1254         else
1255                 pre->next = cur->next;
1256
1257         ping_free (cur);
1258
1259         return (0);
1260 }
1261
1262 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1263 {
1264         return ((pingobj_iter_t *) obj->head);
1265 }
1266
1267 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1268 {
1269         return ((pingobj_iter_t *) iter->next);
1270 }
1271
1272 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1273                 void *buffer, size_t *buffer_len)
1274 {
1275         int ret = EINVAL;
1276
1277         size_t orig_buffer_len = *buffer_len;
1278
1279         switch (info)
1280         {
1281                 case PING_INFO_USERNAME:
1282                         ret = ENOMEM;
1283                         *buffer_len = strlen (iter->username) + 1;
1284                         if (orig_buffer_len <= *buffer_len)
1285                                 break;
1286                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1287                          * will copy `*buffer_len' and pad the rest of
1288                          * `buffer' with null-bytes */
1289                         strncpy (buffer, iter->username, orig_buffer_len);
1290                         ret = 0;
1291                         break;
1292
1293                 case PING_INFO_HOSTNAME:
1294                         ret = ENOMEM;
1295                         *buffer_len = strlen (iter->hostname) + 1;
1296                         if (orig_buffer_len <= *buffer_len)
1297                                 break;
1298                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1299                          * will copy `*buffer_len' and pad the rest of
1300                          * `buffer' with null-bytes */
1301                         strncpy (buffer, iter->hostname, orig_buffer_len);
1302                         ret = 0;
1303                         break;
1304
1305                 case PING_INFO_ADDRESS:
1306                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1307                                         iter->addrlen,
1308                                         (char *) buffer,
1309                                         *buffer_len,
1310                                         NULL, 0,
1311                                         NI_NUMERICHOST);
1312                         if (ret != 0)
1313                         {
1314                                 if ((ret == EAI_MEMORY)
1315 #ifdef EAI_OVERFLOW
1316                                                 || (ret == EAI_OVERFLOW)
1317 #endif
1318                                    )
1319                                         ret = ENOMEM;
1320 #if defined(EAI_SYSTEM)
1321                                 else if (ret == EAI_SYSTEM)
1322                                         ret = errno;
1323 #endif
1324                                 else
1325                                         ret = EINVAL;
1326                         }
1327                         break;
1328
1329                 case PING_INFO_FAMILY:
1330                         ret = ENOMEM;
1331                         *buffer_len = sizeof (int);
1332                         if (orig_buffer_len < sizeof (int))
1333                                 break;
1334                         *((int *) buffer) = iter->addrfamily;
1335                         ret = 0;
1336                         break;
1337
1338                 case PING_INFO_LATENCY:
1339                         ret = ENOMEM;
1340                         *buffer_len = sizeof (double);
1341                         if (orig_buffer_len < sizeof (double))
1342                                 break;
1343                         *((double *) buffer) = iter->latency;
1344                         ret = 0;
1345                         break;
1346
1347                 case PING_INFO_DROPPED:
1348                         ret = ENOMEM;
1349                         *buffer_len = sizeof (uint32_t);
1350                         if (orig_buffer_len < sizeof (uint32_t))
1351                                 break;
1352                         *((uint32_t *) buffer) = iter->dropped;
1353                         ret = 0;
1354                         break;
1355
1356                 case PING_INFO_SEQUENCE:
1357                         ret = ENOMEM;
1358                         *buffer_len = sizeof (unsigned int);
1359                         if (orig_buffer_len < sizeof (unsigned int))
1360                                 break;
1361                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1362                         ret = 0;
1363                         break;
1364
1365                 case PING_INFO_IDENT:
1366                         ret = ENOMEM;
1367                         *buffer_len = sizeof (uint16_t);
1368                         if (orig_buffer_len < sizeof (uint16_t))
1369                                 break;
1370                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1371                         ret = 0;
1372                         break;
1373
1374                 case PING_INFO_DATA:
1375                         ret = ENOMEM;
1376                         *buffer_len = strlen (iter->data);
1377                         if (orig_buffer_len < *buffer_len)
1378                                 break;
1379                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1380                         ret = 0;
1381                         break;
1382         }
1383
1384         return (ret);
1385 } /* ping_iterator_get_info */
1386
1387 void *ping_iterator_get_context (pingobj_iter_t *iter)
1388 {
1389         return (iter->context);
1390 }
1391
1392 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1393 {
1394         iter->context = context;
1395 }