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