src/liboping.c

   1 /**
   2  * Object oriented C module to send ICMP and ICMPv6 `echo's.
   3  * Copyright (C) 2006-2009  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         *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 /* Even though Posix requires "strerror_r" to return an "int",
 141  * some systems (e.g. the GNU libc) return a "char *" _and_
 142  * ignore the second argument ... -tokkee */
 143 char *sstrerror (int errnum, char *buf, size_t buflen)
 144 {
 145         buf[0] = 0;
 146
 147 #if !HAVE_STRERROR_R
 148         {
 149                 snprintf (buf, buflen, "Error %i (%#x)", errnum, errnum);
 150         }
 151 /* #endif !HAVE_STRERROR_R */
 152
 153 #elif STRERROR_R_CHAR_P
 154         {
 155                 char *temp;
 156                 temp = strerror_r (errnum, buf, buflen);
 157                 if (buf[0] == 0)
 158                 {
 159                         if ((temp != NULL) && (temp != buf) && (temp[0] != 0))
 160                                 strncpy (buf, temp, buflen);
 161                         else
 162                                 strncpy (buf, "strerror_r did not return "
 163                                                 "an error message", buflen);
 164                 }
 165         }
 166 /* #endif STRERROR_R_CHAR_P */
 167
 168 #else
 169         if (strerror_r (errnum, buf, buflen) != 0)
 170         {
 171                 snprintf (buf, buflen, "Error %i (%#x); "
 172                                 "Additionally, strerror_r failed.",
 173                                 errnum, errnum);
 174         }
 175 #endif /* STRERROR_R_CHAR_P */
 176
 177         buf[buflen - 1] = 0;
 178
 179         return (buf);
 180 } /* char *sstrerror */
 181
 182 static void ping_set_error (pingobj_t *obj, const char *function,
 183                 const char *message)
 184 {
 185         snprintf (obj->errmsg, sizeof (obj->errmsg),
 186                         "%s: %s", function, message);
 187         obj->errmsg[sizeof (obj->errmsg) - 1] = 0;
 188 }
 189
 190 static void ping_set_errno (pingobj_t *obj, const char *function,
 191                 int error_number)
 192 {
 193         sstrerror (error_number, obj->errmsg, sizeof (obj->errmsg));
 194 }
 195
 196 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
 197                 struct timeval *res)
 198 {
 199         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
 200         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
 201
 202         while (res->tv_usec > 1000000)
 203         {
 204                 res->tv_usec -= 1000000;
 205                 res->tv_sec++;
 206         }
 207
 208         return (0);
 209 }
 210
 211 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
 212                 struct timeval *res)
 213 {
 214         if ((tv1->tv_sec < tv2->tv_sec)
 215                         || ((tv1->tv_sec == tv2->tv_sec)
 216                                 && (tv1->tv_usec < tv2->tv_usec)))
 217                 return (-1);
 218
 219         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
 220         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
 221
 222         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec >= 0)));
 223
 224         while (res->tv_usec < 0)
 225         {
 226                 res->tv_usec += 1000000;
 227                 res->tv_sec--;
 228         }
 229
 230         return (0);
 231 }
 232
 233 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
 234 {
 235         uint32_t sum = 0;
 236         uint16_t ret = 0;
 237
 238         uint16_t *ptr;
 239
 240         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
 241                 sum += *ptr;
 242
 243         if (len == 1)
 244         {
 245                 *(char *) &ret = *(char *) ptr;
 246                 sum += ret;
 247         }
 248
 249         /* Do this twice to get all possible carries.. */
 250         sum = (sum >> 16) + (sum & 0xFFFF);
 251         sum = (sum >> 16) + (sum & 0xFFFF);
 252
 253         ret = ~sum;
 254
 255         return (ret);
 256 }
 257
 258 static pinghost_t *ping_receive_ipv4 (pinghost_t *ph, char *buffer, size_t buffer_len)
 259 {
 260         struct ip *ip_hdr;
 261         struct icmp *icmp_hdr;
 262
 263         size_t ip_hdr_len;
 264
 265         uint16_t recv_checksum;
 266         uint16_t calc_checksum;
 267
 268         uint16_t ident;
 269         uint16_t seq;
 270
 271         pinghost_t *ptr;
 272
 273         if (buffer_len < sizeof (struct ip))
 274                 return (NULL);
 275
 276         ip_hdr     = (struct ip *) buffer;
 277         ip_hdr_len = ip_hdr->ip_hl << 2;
 278
 279         if (buffer_len < ip_hdr_len)
 280                 return (NULL);
 281
 282         buffer     += ip_hdr_len;
 283         buffer_len -= ip_hdr_len;
 284
 285         if (buffer_len < sizeof (struct icmp))
 286                 return (NULL);
 287
 288         icmp_hdr = (struct icmp *) buffer;
 289         buffer     += sizeof (struct icmp);
 290         buffer_len -= sizeof (struct icmp);
 291
 292         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
 293         {
 294                 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
 295                 return (NULL);
 296         }
 297
 298         recv_checksum = icmp_hdr->icmp_cksum;
 299         icmp_hdr->icmp_cksum = 0;
 300         calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
 301                         sizeof (struct icmp) + buffer_len);
 302
 303         if (recv_checksum != calc_checksum)
 304         {
 305                 dprintf ("Checksum missmatch: Got 0x%04x, calculated 0x%04x\n",
 306                                 recv_checksum, calc_checksum);
 307                 return (NULL);
 308         }
 309
 310         ident = ntohs (icmp_hdr->icmp_id);
 311         seq   = ntohs (icmp_hdr->icmp_seq);
 312
 313         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 314         {
 315                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 316                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 317
 318                 if (ptr->addrfamily != AF_INET)
 319                         continue;
 320
 321                 if (!timerisset (ptr->timer))
 322                         continue;
 323
 324                 if (ptr->ident != ident)
 325                         continue;
 326
 327                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 328                         continue;
 329
 330                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
 331                                 ptr->hostname, ident, seq);
 332
 333                 break;
 334         }
 335
 336         if (ptr == NULL)
 337         {
 338                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
 339                                 ident, seq);
 340         }
 341
 342         return (ptr);
 343 }
 344
 345 #ifndef ICMP6_ECHO_REQUEST
 346 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
 347 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
 348 # else
 349 #  define ICMP6_ECHO_REQUEST 128
 350 # endif
 351 #endif
 352
 353 #ifndef ICMP6_ECHO_REPLY
 354 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
 355 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
 356 # else
 357 #  define ICMP6_ECHO_REPLY 129
 358 # endif
 359 #endif
 360
 361 static pinghost_t *ping_receive_ipv6 (pinghost_t *ph, char *buffer, size_t buffer_len)
 362 {
 363         struct icmp6_hdr *icmp_hdr;
 364
 365         uint16_t ident;
 366         uint16_t seq;
 367
 368         pinghost_t *ptr;
 369
 370         if (buffer_len < sizeof (struct icmp6_hdr))
 371                 return (NULL);
 372
 373         icmp_hdr = (struct icmp6_hdr *) buffer;
 374         buffer     += sizeof (struct icmp);
 375         buffer_len -= sizeof (struct icmp);
 376
 377         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 378         {
 379                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 380                 return (NULL);
 381         }
 382
 383         if (icmp_hdr->icmp6_code != 0)
 384         {
 385                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 386                 return (NULL);
 387         }
 388
 389         ident = ntohs (icmp_hdr->icmp6_id);
 390         seq   = ntohs (icmp_hdr->icmp6_seq);
 391
 392         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 393         {
 394                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 395                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 396
 397                 if (ptr->addrfamily != AF_INET6)
 398                         continue;
 399
 400                 if (!timerisset (ptr->timer))
 401                         continue;
 402
 403                 if (ptr->ident != ident)
 404                         continue;
 405
 406                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 407                         continue;
 408
 409                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
 410                                 ptr->hostname, ident, seq);
 411
 412                 break;
 413         }
 414
 415         if (ptr == NULL)
 416         {
 417                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
 418                                 ident, seq);
 419         }
 420
 421         return (ptr);
 422 }
 423
 424 static int ping_receive_one (int fd, pinghost_t *ph, struct timeval *now)
 425 {
 426         char   buffer[4096];
 427         ssize_t buffer_len;
 428
 429         struct timeval diff;
 430
 431         pinghost_t *host = NULL;
 432
 433         struct sockaddr_storage sa;
 434         socklen_t               sa_len;
 435
 436         sa_len = sizeof (sa);
 437
 438         buffer_len = recvfrom (fd, buffer, sizeof (buffer), 0,
 439                         (struct sockaddr *) &sa, &sa_len);
 440         if (buffer_len < 0)
 441         {
 442 #if WITH_DEBUG
 443                 char errbuf[PING_ERRMSG_LEN];
 444                 dprintf ("recvfrom: %s\n",
 445                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 446 #endif
 447                 return (-1);
 448         }
 449
 450         dprintf ("Read %zi bytes from fd = %i\n", buffer_len, fd);
 451
 452         if (sa.ss_family == AF_INET)
 453         {
 454                 if ((host = ping_receive_ipv4 (ph, buffer, buffer_len)) == NULL)
 455                         return (-1);
 456         }
 457         else if (sa.ss_family == AF_INET6)
 458         {
 459                 if ((host = ping_receive_ipv6 (ph, buffer, buffer_len)) == NULL)
 460                         return (-1);
 461         }
 462
 463         dprintf ("rcvd: %12i.%06i\n",
 464                         (int) now->tv_sec,
 465                         (int) now->tv_usec);
 466         dprintf ("sent: %12i.%06i\n",
 467                         (int) host->timer->tv_sec,
 468                         (int) host->timer->tv_usec);
 469
 470         if (ping_timeval_sub (now, host->timer, &diff) < 0)
 471         {
 472                 timerclear (host->timer);
 473                 return (-1);
 474         }
 475
 476         dprintf ("diff: %12i.%06i\n",
 477                         (int) diff.tv_sec,
 478                         (int) diff.tv_usec);
 479
 480         host->latency  = ((double) diff.tv_usec) / 1000.0;
 481         host->latency += ((double) diff.tv_sec)  * 1000.0;
 482
 483         timerclear (host->timer);
 484
 485         return (0);
 486 }
 487
 488 static int ping_receive_all (pingobj_t *obj)
 489 {
 490         fd_set readfds;
 491         int num_readfds;
 492         int max_readfds;
 493
 494         pinghost_t *ph;
 495         pinghost_t *ptr;
 496
 497         struct timeval endtime;
 498         struct timeval nowtime;
 499         struct timeval timeout;
 500         int status;
 501
 502         int ret;
 503
 504         ph = obj->head;
 505         ret = 0;
 506
 507         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 508                 ptr->latency = -1.0;
 509
 510         if (gettimeofday (&nowtime, NULL) == -1)
 511         {
 512                 ping_set_errno (obj, "gettimeofday", errno);
 513                 return (-1);
 514         }
 515
 516         /* Set up timeout */
 517         timeout.tv_sec = (time_t) obj->timeout;
 518         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 519
 520         dprintf ("Set timeout to %i.%06i seconds\n",
 521                         (int) timeout.tv_sec,
 522                         (int) timeout.tv_usec);
 523
 524         ping_timeval_add (&nowtime, &timeout, &endtime);
 525
 526         while (1)
 527         {
 528                 FD_ZERO (&readfds);
 529                 num_readfds =  0;
 530                 max_readfds = -1;
 531
 532                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 533                 {
 534                         if (!timerisset (ptr->timer))
 535                                 continue;
 536
 537                         FD_SET (ptr->fd, &readfds);
 538                         num_readfds++;
 539
 540                         if (max_readfds < ptr->fd)
 541                                 max_readfds = ptr->fd;
 542                 }
 543
 544                 if (num_readfds == 0)
 545                         break;
 546
 547                 if (gettimeofday (&nowtime, NULL) == -1)
 548                 {
 549                         ping_set_errno (obj, "gettimeofday", errno);
 550                         return (-1);
 551                 }
 552
 553                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 554                         break;
 555
 556                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_readfds,
 557                                 (int) timeout.tv_sec,
 558                                 (int) timeout.tv_usec);
 559
 560                 status = select (max_readfds + 1, &readfds, NULL, NULL, &timeout);
 561
 562                 if (gettimeofday (&nowtime, NULL) == -1)
 563                 {
 564                         ping_set_errno (obj, "gettimeofday", errno);
 565                         return (-1);
 566                 }
 567
 568                 if ((status == -1) && (errno == EINTR))
 569                 {
 570                         dprintf ("select was interrupted by signal..\n");
 571                         continue;
 572                 }
 573                 else if (status < 0)
 574                 {
 575 #if WITH_DEBUG
 576                         char errbuf[PING_ERRMSG_LEN];
 577                         dprintf ("select: %s\n",
 578                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 579 #endif
 580                         break;
 581                 }
 582                 else if (status == 0)
 583                 {
 584                         dprintf ("select timed out\n");
 585                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 586                                 if (ptr->latency < 0.0)
 587                                         ptr->dropped++;
 588                         break;
 589                 }
 590
 591                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 592                 {
 593                         if (FD_ISSET (ptr->fd, &readfds))
 594                                 if (ping_receive_one (ptr->fd, ph, &nowtime) == 0)
 595                                         ret++;
 596                 }
 597         } /* while (1) */
 598
 599         return (ret);
 600 }
 601
 602 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 603  * Sending functions:                                                        *
 604  *                                                                           *
 605  * ping_send_all                                                             *
 606  * +-> ping_send_one_ipv4                                                    *
 607  * `-> ping_send_one_ipv6                                                    *
 608  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 609 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 610                 const void *buf, size_t buflen)
 611 {
 612         ssize_t ret;
 613
 614         if (gettimeofday (ph->timer, NULL) == -1)
 615         {
 616                 timerclear (ph->timer);
 617                 return (-1);
 618         }
 619
 620         ret = sendto (ph->fd, buf, buflen, 0,
 621                         (struct sockaddr *) ph->addr, ph->addrlen);
 622
 623         if (ret < 0)
 624         {
 625 #if defined(EHOSTUNREACH)
 626                 if (errno == EHOSTUNREACH)
 627                         return (0);
 628 #endif
 629 #if defined(ENETUNREACH)
 630                 if (errno == ENETUNREACH)
 631                         return (0);
 632 #endif
 633                 ping_set_errno (obj, "sendto", errno);
 634         }
 635
 636         return (ret);
 637 }
 638
 639 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 640 {
 641         struct icmp *icmp4;
 642         int status;
 643
 644         char buf[4096];
 645         int  buflen;
 646
 647         char *data;
 648         int   datalen;
 649
 650         dprintf ("ph->hostname = %s\n", ph->hostname);
 651
 652         memset (buf, '\0', sizeof (buf));
 653         icmp4 = (struct icmp *) buf;
 654         data  = (char *) (icmp4 + 1);
 655
 656         icmp4->icmp_type  = ICMP_ECHO;
 657         icmp4->icmp_code  = 0;
 658         icmp4->icmp_cksum = 0;
 659         icmp4->icmp_id    = htons (ph->ident);
 660         icmp4->icmp_seq   = htons (ph->sequence);
 661
 662         buflen = 4096 - sizeof (struct icmp);
 663         strncpy (data, ph->data, buflen);
 664         datalen = strlen (data);
 665
 666         buflen = datalen + sizeof (struct icmp);
 667
 668         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 669
 670         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 671
 672         status = ping_sendto (obj, ph, buf, buflen);
 673         if (status < 0)
 674         {
 675                 perror ("ping_sendto");
 676                 return (-1);
 677         }
 678
 679         dprintf ("sendto: status = %i\n", status);
 680
 681         return (0);
 682 }
 683
 684 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 685 {
 686         struct icmp6_hdr *icmp6;
 687         int status;
 688
 689         char buf[4096];
 690         int  buflen;
 691
 692         char *data;
 693         int   datalen;
 694
 695         dprintf ("ph->hostname = %s\n", ph->hostname);
 696
 697         memset (buf, '\0', sizeof (buf));
 698         icmp6 = (struct icmp6_hdr *) buf;
 699         data  = (char *) (icmp6 + 1);
 700
 701         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 702         icmp6->icmp6_code  = 0;
 703         /* The checksum will be calculated by the TCP/IP stack.  */
 704         /* FIXME */
 705         icmp6->icmp6_cksum = 0;
 706         icmp6->icmp6_id    = htons (ph->ident);
 707         icmp6->icmp6_seq   = htons (ph->sequence);
 708
 709         buflen = 4096 - sizeof (struct icmp6_hdr);
 710         strncpy (data, ph->data, buflen);
 711         datalen = strlen (data);
 712
 713         buflen = datalen + sizeof (struct icmp6_hdr);
 714
 715         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 716
 717         status = ping_sendto (obj, ph, buf, buflen);
 718         if (status < 0)
 719         {
 720                 perror ("ping_sendto");
 721                 return (-1);
 722         }
 723
 724         dprintf ("sendto: status = %i\n", status);
 725
 726         return (0);
 727 }
 728
 729 static int ping_send_all (pingobj_t *obj)
 730 {
 731         pinghost_t *ph;
 732         pinghost_t *ptr;
 733
 734         int ret;
 735
 736         ret = 0;
 737         ph = obj->head;
 738
 739         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 740         {
 741                 /* start timer.. The GNU `ping6' starts the timer before
 742                  * sending the packet, so I will do that too */
 743                 if (gettimeofday (ptr->timer, NULL) == -1)
 744                 {
 745 #if WITH_DEBUG
 746                         char errbuf[PING_ERRMSG_LEN];
 747                         dprintf ("gettimeofday: %s\n",
 748                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 749 #endif
 750                         timerclear (ptr->timer);
 751                         ret--;
 752                         continue;
 753                 }
 754                 else
 755                 {
 756                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 757                 }
 758
 759                 if (ptr->addrfamily == AF_INET6)
 760                 {
 761                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 762                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 763                         {
 764                                 timerclear (ptr->timer);
 765                                 ret--;
 766                                 continue;
 767                         }
 768                 }
 769                 else if (ptr->addrfamily == AF_INET)
 770                 {
 771                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 772                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 773                         {
 774                                 timerclear (ptr->timer);
 775                                 ret--;
 776                                 continue;
 777                         }
 778                 }
 779                 else /* this should not happen */
 780                 {
 781                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 782                         timerclear (ptr->timer);
 783                         ret--;
 784                         continue;
 785                 }
 786
 787                 ptr->sequence++;
 788         }
 789
 790         return (ret);
 791 }
 792
 793 /*
 794  * Set the TTL of a socket protocol independently.
 795  */
 796 static int ping_set_ttl (pinghost_t *ph, int ttl)
 797 {
 798         int ret = -2;
 799
 800         if (ph->addrfamily == AF_INET)
 801         {
 802                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL, &ttl, sizeof (ttl));
 803         }
 804         else if (ph->addrfamily == AF_INET6)
 805         {
 806                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof (ttl));
 807         }
 808
 809         return (ret);
 810 }
 811
 812 static int ping_get_ident (void)
 813 {
 814         int fd;
 815         static int did_seed = 0;
 816
 817         int retval;
 818
 819         if (did_seed == 0)
 820         {
 821                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 822                 {
 823                         unsigned int seed;
 824
 825                         if (read (fd, &seed, sizeof (seed)) != -1)
 826                         {
 827                                 did_seed = 1;
 828                                 dprintf ("Random seed:   %#x\n", seed);
 829                                 srandom (seed);
 830                         }
 831
 832                         close (fd);
 833                 }
 834 #if WITH_DEBUG
 835                 else
 836                 {
 837                         char errbuf[PING_ERRMSG_LEN];
 838                         dprintf ("open (/dev/urandom): %s\n",
 839                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 840                 }
 841 #endif
 842         }
 843
 844         retval = (int) random ();
 845
 846         dprintf ("Random number: %#x\n", retval);
 847
 848         return (retval);
 849 }
 850
 851 static pinghost_t *ping_alloc (void)
 852 {
 853         pinghost_t *ph;
 854         size_t      ph_size;
 855
 856         ph_size = sizeof (pinghost_t)
 857                 + sizeof (struct sockaddr_storage)
 858                 + sizeof (struct timeval);
 859
 860         ph = (pinghost_t *) malloc (ph_size);
 861         if (ph == NULL)
 862                 return (NULL);
 863
 864         memset (ph, '\0', ph_size);
 865
 866         ph->timer   = (struct timeval *) (ph + 1);
 867         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
 868
 869         ph->addrlen = sizeof (struct sockaddr_storage);
 870         ph->fd      = -1;
 871         ph->latency = -1.0;
 872         ph->dropped = 0;
 873         ph->ident   = ping_get_ident () & 0xFFFF;
 874
 875         return (ph);
 876 }
 877
 878 static void ping_free (pinghost_t *ph)
 879 {
 880         if (ph->fd >= 0)
 881                 close (ph->fd);
 882
 883         if (ph->username != NULL)
 884                 free (ph->username);
 885
 886         if (ph->hostname != NULL)
 887                 free (ph->hostname);
 888
 889         if (ph->data != NULL)
 890                 free (ph->data);
 891
 892         free (ph);
 893 }
 894
 895 /*
 896  * public methods
 897  */
 898 const char *ping_get_error (pingobj_t *obj)
 899 {
 900         return (obj->errmsg);
 901 }
 902
 903 pingobj_t *ping_construct (void)
 904 {
 905         pingobj_t *obj;
 906
 907         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
 908                 return (NULL);
 909         memset (obj, '\0', sizeof (pingobj_t));
 910
 911         obj->timeout    = PING_DEF_TIMEOUT;
 912         obj->ttl        = PING_DEF_TTL;
 913         obj->addrfamily = PING_DEF_AF;
 914         obj->data       = strdup (PING_DEF_DATA);
 915
 916         return (obj);
 917 }
 918
 919 void ping_destroy (pingobj_t *obj)
 920 {
 921         pinghost_t *current;
 922         pinghost_t *next;
 923
 924         current = obj->head;
 925         next = NULL;
 926
 927         while (current != NULL)
 928         {
 929                 next = current->next;
 930                 ping_free (current);
 931                 current = next;
 932         }
 933
 934         if (obj->data != NULL)
 935                 free (obj->data);
 936
 937         if (obj->srcaddr != NULL)
 938                 free (obj->srcaddr);
 939
 940         free (obj);
 941
 942         return;
 943 }
 944
 945 int ping_setopt (pingobj_t *obj, int option, void *value)
 946 {
 947         int ret = 0;
 948
 949         switch (option)
 950         {
 951                 case PING_OPT_TIMEOUT:
 952                         obj->timeout = *((double *) value);
 953                         if (obj->timeout < 0.0)
 954                         {
 955                                 obj->timeout = PING_DEF_TIMEOUT;
 956                                 ret = -1;
 957                         }
 958                         break;
 959
 960                 case PING_OPT_TTL:
 961                         obj->ttl = *((int *) value);
 962                         if ((obj->ttl < 1) || (obj->ttl > 255))
 963                         {
 964                                 obj->ttl = PING_DEF_TTL;
 965                                 ret = -1;
 966                         }
 967                         break;
 968
 969                 case PING_OPT_AF:
 970                         obj->addrfamily = *((int *) value);
 971                         if ((obj->addrfamily != AF_UNSPEC)
 972                                         && (obj->addrfamily != AF_INET)
 973                                         && (obj->addrfamily != AF_INET6))
 974                         {
 975                                 obj->addrfamily = PING_DEF_AF;
 976                                 ret = -1;
 977                         }
 978                         if (obj->srcaddr != NULL)
 979                         {
 980                                 free (obj->srcaddr);
 981                                 obj->srcaddr = NULL;
 982                         }
 983                         break;
 984
 985                 case PING_OPT_DATA:
 986                         if (obj->data != NULL)
 987                         {
 988                                 free (obj->data);
 989                                 obj->data = NULL;
 990                         }
 991                         obj->data = strdup ((const char *) value);
 992                         break;
 993
 994                 case PING_OPT_SOURCE:
 995                 {
 996                         char            *hostname = (char *) value;
 997                         struct addrinfo  ai_hints;
 998                         struct addrinfo *ai_list;
 999                         int              status;
1000 #if WITH_DEBUG
1001                         if (obj->addrfamily != AF_UNSPEC)
1002                         {
1003                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1004                         }
1005 #endif
1006                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1007                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1008 #if defined(AI_ADDRCONFIG)
1009                         ai_hints.ai_flags = AI_ADDRCONFIG;
1010 #endif
1011                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1012                         if (status != 0)
1013                         {
1014 #if defined(EAI_SYSTEM)
1015                                 char errbuf[PING_ERRMSG_LEN];
1016 #endif
1017                                 ping_set_error (obj, "getaddrinfo",
1018 #if defined(EAI_SYSTEM)
1019                                                 (status == EAI_SYSTEM)
1020                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1021 #endif
1022                                                 gai_strerror (status));
1023                                 ret = -1;
1024                                 break;
1025                         }
1026 #if WITH_DEBUG
1027                         if (ai_list->ai_next != NULL)
1028                         {
1029                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1030                         }
1031 #endif
1032                         if (obj->srcaddr == NULL)
1033                         {
1034                                 obj->srcaddrlen = 0;
1035                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1036                                 if (obj->srcaddr == NULL)
1037                                 {
1038                                         ping_set_errno (obj, "malloc", errno);
1039                                         ret = -1;
1040                                         freeaddrinfo (ai_list);
1041                                         break;
1042                                 }
1043                         }
1044                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1045                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1046                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1047                                         ai_list->ai_addrlen);
1048                         obj->srcaddrlen = ai_list->ai_addrlen;
1049                         obj->addrfamily = ai_list->ai_family;
1050
1051                         freeaddrinfo (ai_list);
1052                 } /* case PING_OPT_SOURCE */
1053                 break;
1054
1055                 default:
1056                         ret = -2;
1057         } /* switch (option) */
1058
1059         return (ret);
1060 } /* int ping_setopt */
1061
1062
1063 int ping_send (pingobj_t *obj)
1064 {
1065         int ret;
1066
1067         if (ping_send_all (obj) < 0)
1068                 return (-1);
1069
1070         if ((ret = ping_receive_all (obj)) < 0)
1071                 return (-2);
1072
1073         return (ret);
1074 }
1075
1076 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1077 {
1078         while (ph != NULL)
1079         {
1080                 if (strcasecmp (ph->username, host) == 0)
1081                         break;
1082
1083                 ph = ph->next;
1084         }
1085
1086         return (ph);
1087 }
1088
1089 int ping_host_add (pingobj_t *obj, const char *host)
1090 {
1091         pinghost_t *ph;
1092
1093         struct addrinfo  ai_hints;
1094         struct addrinfo *ai_list, *ai_ptr;
1095         int              ai_return;
1096
1097         dprintf ("host = %s\n", host);
1098
1099         if (ping_host_search (obj->head, host) != NULL)
1100                 return (0);
1101
1102         memset (&ai_hints, '\0', sizeof (ai_hints));
1103         ai_hints.ai_flags     = 0;
1104 #ifdef AI_ADDRCONFIG
1105         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1106 #endif
1107 #ifdef AI_CANONNAME
1108         ai_hints.ai_flags    |= AI_CANONNAME;
1109 #endif
1110         ai_hints.ai_family    = obj->addrfamily;
1111         ai_hints.ai_socktype  = SOCK_RAW;
1112
1113         if ((ph = ping_alloc ()) == NULL)
1114         {
1115                 dprintf ("Out of memory!\n");
1116                 return (-1);
1117         }
1118
1119         if ((ph->username = strdup (host)) == NULL)
1120         {
1121                 dprintf ("Out of memory!\n");
1122                 ping_set_errno (obj, "strdup", errno);
1123                 ping_free (ph);
1124                 return (-1);
1125         }
1126
1127         if ((ph->hostname = strdup (host)) == NULL)
1128         {
1129                 dprintf ("Out of memory!\n");
1130                 ping_set_errno (obj, "strdup", errno);
1131                 ping_free (ph);
1132                 return (-1);
1133         }
1134
1135         /* obj->data is not garuanteed to be != NULL */
1136         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1137         {
1138                 dprintf ("Out of memory!\n");
1139                 ping_set_errno (obj, "strdup", errno);
1140                 ping_free (ph);
1141                 return (-1);
1142         }
1143
1144         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1145         {
1146 #if defined(EAI_SYSTEM)
1147                 char errbuf[PING_ERRMSG_LEN];
1148 #endif
1149                 dprintf ("getaddrinfo failed\n");
1150                 ping_set_error (obj, "getaddrinfo",
1151 #if defined(EAI_SYSTEM)
1152                                                 (ai_return == EAI_SYSTEM)
1153                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1154 #endif
1155                                 gai_strerror (ai_return));
1156                 ping_free (ph);
1157                 return (-1);
1158         }
1159
1160         if (ai_list == NULL)
1161                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1162
1163         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1164         {
1165                 ph->fd = -1;
1166
1167                 if (ai_ptr->ai_family == AF_INET)
1168                 {
1169                         ai_ptr->ai_socktype = SOCK_RAW;
1170                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1171                 }
1172                 else if (ai_ptr->ai_family == AF_INET6)
1173                 {
1174                         ai_ptr->ai_socktype = SOCK_RAW;
1175                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1176                 }
1177                 else
1178                 {
1179                         char errmsg[PING_ERRMSG_LEN];
1180
1181                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1182                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1183
1184                         dprintf (errmsg);
1185                         ping_set_error (obj, "getaddrinfo", errmsg);
1186                         continue;
1187                 }
1188
1189                 /* TODO: Move this to a static function `ping_open_socket' and
1190                  * call it whenever the socket dies. */
1191                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1192                 if (ph->fd == -1)
1193                 {
1194 #if WITH_DEBUG
1195                         char errbuf[PING_ERRMSG_LEN];
1196                         dprintf ("socket: %s\n",
1197                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1198 #endif
1199                         ping_set_errno (obj, "socket", errno);
1200                         continue;
1201                 }
1202
1203                 if (obj->srcaddr != NULL)
1204                 {
1205                         assert (obj->srcaddrlen > 0);
1206                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1207
1208                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1209                         {
1210 #if WITH_DEBUG
1211                                 char errbuf[PING_ERRMSG_LEN];
1212                                 dprintf ("bind: %s\n",
1213                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1214 #endif
1215                                 ping_set_errno (obj, "bind", errno);
1216                                 close (ph->fd);
1217                                 ph->fd = -1;
1218                                 continue;
1219                         }
1220                 }
1221
1222                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1223                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1224                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1225                 ph->addrlen = ai_ptr->ai_addrlen;
1226                 ph->addrfamily = ai_ptr->ai_family;
1227
1228 #ifdef AI_CANONNAME
1229                 if ((ai_ptr->ai_canonname != NULL)
1230                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1231                 {
1232                         char *old_hostname;
1233
1234                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1235                                         ph->hostname, ai_ptr->ai_canonname);
1236
1237                         old_hostname = ph->hostname;
1238                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1239                         {
1240                                 /* strdup failed, falling back to old hostname */
1241                                 ph->hostname = old_hostname;
1242                         }
1243                         else if (old_hostname != NULL)
1244                         {
1245                                 free (old_hostname);
1246                         }
1247                 }
1248 #endif /* AI_CANONNAME */
1249
1250                 break;
1251         }
1252
1253         freeaddrinfo (ai_list);
1254
1255         if (ph->fd < 0)
1256         {
1257                 ping_free (ph);
1258                 return (-1);
1259         }
1260
1261         /*
1262          * Adding in the front is much easier, but then the iterator will
1263          * return the host that was added last as first host. That's just not
1264          * nice. -octo
1265          */
1266         if (obj->head == NULL)
1267         {
1268                 obj->head = ph;
1269         }
1270         else
1271         {
1272                 pinghost_t *hptr;
1273
1274                 hptr = obj->head;
1275                 while (hptr->next != NULL)
1276                         hptr = hptr->next;
1277
1278                 assert ((hptr != NULL) && (hptr->next == NULL));
1279                 hptr->next = ph;
1280         }
1281
1282         ping_set_ttl (ph, obj->ttl);
1283
1284         return (0);
1285 }
1286
1287 int ping_host_remove (pingobj_t *obj, const char *host)
1288 {
1289         pinghost_t *pre, *cur;
1290
1291         pre = NULL;
1292         cur = obj->head;
1293
1294         while (cur != NULL)
1295         {
1296                 if (strcasecmp (host, cur->username) == 0)
1297                         break;
1298
1299                 pre = cur;
1300                 cur = cur->next;
1301         }
1302
1303         if (cur == NULL)
1304         {
1305                 ping_set_error (obj, "ping_host_remove", "Host not found");
1306                 return (-1);
1307         }
1308
1309         if (pre == NULL)
1310                 obj->head = cur->next;
1311         else
1312                 pre->next = cur->next;
1313
1314         ping_free (cur);
1315
1316         return (0);
1317 }
1318
1319 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1320 {
1321         return ((pingobj_iter_t *) obj->head);
1322 }
1323
1324 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1325 {
1326         return ((pingobj_iter_t *) iter->next);
1327 }
1328
1329 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1330                 void *buffer, size_t *buffer_len)
1331 {
1332         int ret = EINVAL;
1333
1334         size_t orig_buffer_len = *buffer_len;
1335
1336         switch (info)
1337         {
1338                 case PING_INFO_USERNAME:
1339                         ret = ENOMEM;
1340                         *buffer_len = strlen (iter->username) + 1;
1341                         if (orig_buffer_len <= *buffer_len)
1342                                 break;
1343                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1344                          * will copy `*buffer_len' and pad the rest of
1345                          * `buffer' with null-bytes */
1346                         strncpy (buffer, iter->username, orig_buffer_len);
1347                         ret = 0;
1348                         break;
1349
1350                 case PING_INFO_HOSTNAME:
1351                         ret = ENOMEM;
1352                         *buffer_len = strlen (iter->hostname) + 1;
1353                         if (orig_buffer_len < *buffer_len)
1354                                 break;
1355                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1356                          * will copy `*buffer_len' and pad the rest of
1357                          * `buffer' with null-bytes */
1358                         strncpy (buffer, iter->hostname, orig_buffer_len);
1359                         ret = 0;
1360                         break;
1361
1362                 case PING_INFO_ADDRESS:
1363                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1364                                         iter->addrlen,
1365                                         (char *) buffer,
1366                                         *buffer_len,
1367                                         NULL, 0,
1368                                         NI_NUMERICHOST);
1369                         if (ret != 0)
1370                         {
1371                                 if ((ret == EAI_MEMORY)
1372 #ifdef EAI_OVERFLOW
1373                                                 || (ret == EAI_OVERFLOW)
1374 #endif
1375                                    )
1376                                         ret = ENOMEM;
1377 #if defined(EAI_SYSTEM)
1378                                 else if (ret == EAI_SYSTEM)
1379                                         ret = errno;
1380 #endif
1381                                 else
1382                                         ret = EINVAL;
1383                         }
1384                         break;
1385
1386                 case PING_INFO_FAMILY:
1387                         ret = ENOMEM;
1388                         *buffer_len = sizeof (int);
1389                         if (orig_buffer_len < sizeof (int))
1390                                 break;
1391                         *((int *) buffer) = iter->addrfamily;
1392                         ret = 0;
1393                         break;
1394
1395                 case PING_INFO_LATENCY:
1396                         ret = ENOMEM;
1397                         *buffer_len = sizeof (double);
1398                         if (orig_buffer_len < sizeof (double))
1399                                 break;
1400                         *((double *) buffer) = iter->latency;
1401                         ret = 0;
1402                         break;
1403
1404                 case PING_INFO_DROPPED:
1405                         ret = ENOMEM;
1406                         *buffer_len = sizeof (uint32_t);
1407                         if (orig_buffer_len < sizeof (uint32_t))
1408                                 break;
1409                         *((uint32_t *) buffer) = iter->dropped;
1410                         ret = 0;
1411                         break;
1412
1413                 case PING_INFO_SEQUENCE:
1414                         ret = ENOMEM;
1415                         *buffer_len = sizeof (unsigned int);
1416                         if (orig_buffer_len < sizeof (unsigned int))
1417                                 break;
1418                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1419                         ret = 0;
1420                         break;
1421
1422                 case PING_INFO_IDENT:
1423                         ret = ENOMEM;
1424                         *buffer_len = sizeof (uint16_t);
1425                         if (orig_buffer_len < sizeof (uint16_t))
1426                                 break;
1427                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1428                         ret = 0;
1429                         break;
1430
1431                 case PING_INFO_DATA:
1432                         ret = ENOMEM;
1433                         *buffer_len = strlen (iter->data);
1434                         if (orig_buffer_len < *buffer_len)
1435                                 break;
1436                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1437                         ret = 0;
1438                         break;
1439         }
1440
1441         return (ret);
1442 } /* ping_iterator_get_info */
1443
1444 void *ping_iterator_get_context (pingobj_iter_t *iter)
1445 {
1446         return (iter->context);
1447 }
1448
1449 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1450 {
1451         iter->context = context;
1452 }