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