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