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 <inttypes.h>
  29 # include <errno.h>
  30 # include <assert.h>
  31 #else
  32 # error "You don't have the standard C99 header files installed"
  33 #endif /* STDC_HEADERS */
  34
  35 #ifdef HAVE_STDINT_H
  36 # include <stdint.h>
  37 #endif
  38
  39 #if HAVE_UNISTD_H
  40 # include <unistd.h>
  41 #endif
  42
  43 #if HAVE_FCNTL_H
  44 # include <fcntl.h>
  45 #endif
  46 #if HAVE_SYS_TYPES_H
  47 # include <sys/types.h>
  48 #endif
  49 #if HAVE_SYS_STAT_H
  50 # include <sys/stat.h>
  51 #endif
  52
  53 #if TIME_WITH_SYS_TIME
  54 # include <sys/time.h>
  55 # include <time.h>
  56 #else
  57 # if HAVE_SYS_TIME_H
  58 #  include <sys/time.h>
  59 # else
  60 #  include <time.h>
  61 # endif
  62 #endif
  63
  64 #if HAVE_SYS_SOCKET_H
  65 # include <sys/socket.h>
  66 #endif
  67
  68 #if HAVE_NETDB_H
  69 # include <netdb.h>
  70 #endif
  71
  72 #if HAVE_NETINET_IN_SYSTM_H
  73 # include <netinet/in_systm.h>
  74 #endif
  75 #if HAVE_NETINET_IN_H
  76 # include <netinet/in.h>
  77 #endif
  78 #if HAVE_NETINET_IP_H
  79 # include <netinet/ip.h>
  80 #endif
  81 #if HAVE_NETINET_IP_ICMP_H
  82 # include <netinet/ip_icmp.h>
  83 #endif
  84 #ifdef HAVE_NETINET_IP_VAR_H
  85 # include <netinet/ip_var.h>
  86 #endif
  87 #if HAVE_NETINET_IP6_H
  88 # include <netinet/ip6.h>
  89 #endif
  90 #if HAVE_NETINET_ICMP6_H
  91 # include <netinet/icmp6.h>
  92 #endif
  93
  94 #include "oping.h"
  95
  96 #if WITH_DEBUG
  97 # define dprintf(...) printf ("%s[%4i]: %-20s: ", __FILE__, __LINE__, __FUNCTION__); printf (__VA_ARGS__)
  98 #else
  99 # define dprintf(...) /**/
 100 #endif
 101
 102 #define PING_ERRMSG_LEN 256
 103
 104 struct pinghost
 105 {
 106         /* username: name passed in by the user */
 107         char                    *username;
 108         /* hostname: name returned by the reverse lookup */
 109         char                    *hostname;
 110         struct sockaddr_storage *addr;
 111         socklen_t                addrlen;
 112         int                      addrfamily;
 113         int                      fd;
 114         int                      ident;
 115         int                      sequence;
 116         struct timeval          *timer;
 117         double                   latency;
 118         uint32_t                 dropped;
 119         int                      recv_ttl;
 120         char                    *data;
 121
 122         void                    *context;
 123
 124         struct pinghost         *next;
 125 };
 126
 127 struct pingobj
 128 {
 129         double                   timeout;
 130         int                      ttl;
 131         int                      addrfamily;
 132         char                    *data;
 133
 134         struct sockaddr         *srcaddr;
 135         socklen_t                srcaddrlen;
 136
 137         char                     errmsg[PING_ERRMSG_LEN];
 138
 139         pinghost_t              *head;
 140 };
 141
 142 /*
 143  * private (static) functions
 144  */
 145 /* Even though Posix requires "strerror_r" to return an "int",
 146  * some systems (e.g. the GNU libc) return a "char *" _and_
 147  * ignore the second argument ... -tokkee */
 148 static char *sstrerror (int errnum, char *buf, size_t buflen)
 149 {
 150         buf[0] = 0;
 151
 152 #if !HAVE_STRERROR_R
 153         {
 154                 snprintf (buf, buflen, "Error %i (%#x)", errnum, errnum);
 155         }
 156 /* #endif !HAVE_STRERROR_R */
 157
 158 #elif STRERROR_R_CHAR_P
 159         {
 160                 char *temp;
 161                 temp = strerror_r (errnum, buf, buflen);
 162                 if (buf[0] == 0)
 163                 {
 164                         if ((temp != NULL) && (temp != buf) && (temp[0] != 0))
 165                                 strncpy (buf, temp, buflen);
 166                         else
 167                                 strncpy (buf, "strerror_r did not return "
 168                                                 "an error message", buflen);
 169                 }
 170         }
 171 /* #endif STRERROR_R_CHAR_P */
 172
 173 #else
 174         if (strerror_r (errnum, buf, buflen) != 0)
 175         {
 176                 snprintf (buf, buflen, "Error %i (%#x); "
 177                                 "Additionally, strerror_r failed.",
 178                                 errnum, errnum);
 179         }
 180 #endif /* STRERROR_R_CHAR_P */
 181
 182         buf[buflen - 1] = 0;
 183
 184         return (buf);
 185 } /* char *sstrerror */
 186
 187 static void ping_set_error (pingobj_t *obj, const char *function,
 188                 const char *message)
 189 {
 190         snprintf (obj->errmsg, sizeof (obj->errmsg),
 191                         "%s: %s", function, message);
 192         obj->errmsg[sizeof (obj->errmsg) - 1] = 0;
 193 }
 194
 195 static void ping_set_errno (pingobj_t *obj, int error_number)
 196 {
 197         sstrerror (error_number, obj->errmsg, sizeof (obj->errmsg));
 198 }
 199
 200 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
 201                 struct timeval *res)
 202 {
 203         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
 204         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
 205
 206         while (res->tv_usec > 1000000)
 207         {
 208                 res->tv_usec -= 1000000;
 209                 res->tv_sec++;
 210         }
 211
 212         return (0);
 213 }
 214
 215 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
 216                 struct timeval *res)
 217 {
 218         if ((tv1->tv_sec < tv2->tv_sec)
 219                         || ((tv1->tv_sec == tv2->tv_sec)
 220                                 && (tv1->tv_usec < tv2->tv_usec)))
 221                 return (-1);
 222
 223         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
 224         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
 225
 226         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec >= 0)));
 227
 228         while (res->tv_usec < 0)
 229         {
 230                 res->tv_usec += 1000000;
 231                 res->tv_sec--;
 232         }
 233
 234         return (0);
 235 }
 236
 237 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
 238 {
 239         uint32_t sum = 0;
 240         uint16_t ret = 0;
 241
 242         uint16_t *ptr;
 243
 244         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
 245                 sum += *ptr;
 246
 247         if (len == 1)
 248         {
 249                 *(char *) &ret = *(char *) ptr;
 250                 sum += ret;
 251         }
 252
 253         /* Do this twice to get all possible carries.. */
 254         sum = (sum >> 16) + (sum & 0xFFFF);
 255         sum = (sum >> 16) + (sum & 0xFFFF);
 256
 257         ret = ~sum;
 258
 259         return (ret);
 260 }
 261
 262 static pinghost_t *ping_receive_ipv4 (pingobj_t *obj, char *buffer,
 263                 size_t buffer_len)
 264 {
 265         struct ip *ip_hdr;
 266         struct icmp *icmp_hdr;
 267
 268         size_t ip_hdr_len;
 269
 270         uint16_t recv_checksum;
 271         uint16_t calc_checksum;
 272
 273         uint16_t ident;
 274         uint16_t seq;
 275
 276         pinghost_t *ptr;
 277
 278         if (buffer_len < sizeof (struct ip))
 279                 return (NULL);
 280
 281         ip_hdr     = (struct ip *) buffer;
 282         ip_hdr_len = ip_hdr->ip_hl << 2;
 283
 284         if (buffer_len < ip_hdr_len)
 285                 return (NULL);
 286
 287         buffer     += ip_hdr_len;
 288         buffer_len -= ip_hdr_len;
 289
 290         if (buffer_len < sizeof (struct icmp))
 291                 return (NULL);
 292
 293         icmp_hdr = (struct icmp *) buffer;
 294         buffer     += sizeof (struct icmp);
 295         buffer_len -= sizeof (struct icmp);
 296
 297         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
 298         {
 299                 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
 300                 return (NULL);
 301         }
 302
 303         recv_checksum = icmp_hdr->icmp_cksum;
 304         icmp_hdr->icmp_cksum = 0;
 305         calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
 306                         sizeof (struct icmp) + buffer_len);
 307
 308         if (recv_checksum != calc_checksum)
 309         {
 310                 dprintf ("Checksum missmatch: Got 0x%04x, calculated 0x%04x\n",
 311                                 recv_checksum, calc_checksum);
 312                 return (NULL);
 313         }
 314
 315         ident = ntohs (icmp_hdr->icmp_id);
 316         seq   = ntohs (icmp_hdr->icmp_seq);
 317
 318         /* We have to iterate over all hosts, since ICMPv4 packets may
 319          * be received on any raw v4 socket. */
 320         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 321         {
 322                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 323                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 324
 325                 if (ptr->addrfamily != AF_INET)
 326                         continue;
 327
 328                 if (!timerisset (ptr->timer))
 329                         continue;
 330
 331                 if (ptr->ident != ident)
 332                         continue;
 333
 334                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 335                         continue;
 336
 337                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
 338                                 ptr->hostname, ident, seq);
 339
 340                 break;
 341         }
 342
 343         if (ptr == NULL)
 344         {
 345                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
 346                                 ident, seq);
 347         }
 348
 349         if (ptr != NULL)
 350                 ptr->recv_ttl = ip_hdr->ip_ttl;
 351
 352         return (ptr);
 353 }
 354
 355 #ifndef ICMP6_ECHO_REQUEST
 356 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
 357 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
 358 # else
 359 #  define ICMP6_ECHO_REQUEST 128
 360 # endif
 361 #endif
 362
 363 #ifndef ICMP6_ECHO_REPLY
 364 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
 365 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
 366 # else
 367 #  define ICMP6_ECHO_REPLY 129
 368 # endif
 369 #endif
 370
 371 static pinghost_t *ping_receive_ipv6 (pingobj_t *obj, char *buffer,
 372                 size_t buffer_len)
 373 {
 374         struct icmp6_hdr *icmp_hdr;
 375
 376         uint16_t ident;
 377         uint16_t seq;
 378
 379         pinghost_t *ptr;
 380
 381         if (buffer_len < sizeof (struct icmp6_hdr))
 382                 return (NULL);
 383
 384         icmp_hdr = (struct icmp6_hdr *) buffer;
 385         buffer     += sizeof (struct icmp);
 386         buffer_len -= sizeof (struct icmp);
 387
 388         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
 389         {
 390                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
 391                 return (NULL);
 392         }
 393
 394         if (icmp_hdr->icmp6_code != 0)
 395         {
 396                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
 397                 return (NULL);
 398         }
 399
 400         ident = ntohs (icmp_hdr->icmp6_id);
 401         seq   = ntohs (icmp_hdr->icmp6_seq);
 402
 403         /* We have to iterate over all hosts, since ICMPv6 packets may
 404          * be received on any raw v6 socket. */
 405         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
 406         {
 407                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
 408                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
 409
 410                 if (ptr->addrfamily != AF_INET6)
 411                         continue;
 412
 413                 if (!timerisset (ptr->timer))
 414                         continue;
 415
 416                 if (ptr->ident != ident)
 417                         continue;
 418
 419                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
 420                         continue;
 421
 422                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
 423                                 ptr->hostname, ident, seq);
 424
 425                 break;
 426         }
 427
 428         if (ptr == NULL)
 429         {
 430                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
 431                                 ident, seq);
 432         }
 433
 434         return (ptr);
 435 }
 436
 437 static int ping_receive_one (pingobj_t *obj, const pinghost_t *ph,
 438                 struct timeval *now)
 439 {
 440         /* Note: 'ph' is not necessarily the host object for which we receive a
 441          * reply. The right object will be returned by ping_receive_ipv*(). For
 442          * now, we can only rely on ph->fd and ph->addrfamily. */
 443
 444         struct timeval diff;
 445         pinghost_t *host = NULL;
 446         int recv_ttl;
 447
 448         /*
 449          * Set up the receive buffer..
 450          */
 451         struct msghdr msghdr;
 452         struct cmsghdr *cmsg;
 453         char payload_buffer[4096];
 454         ssize_t payload_buffer_len;
 455         char control_buffer[4096];
 456         struct iovec payload_iovec;
 457
 458         memset (&payload_iovec, 0, sizeof (payload_iovec));
 459         payload_iovec.iov_base = payload_buffer;
 460         payload_iovec.iov_len = sizeof (payload_buffer);
 461
 462         memset (&msghdr, 0, sizeof (msghdr));
 463         /* unspecified source address */
 464         msghdr.msg_name = NULL;
 465         msghdr.msg_namelen = 0;
 466         /* output buffer vector, see readv(2) */
 467         msghdr.msg_iov = &payload_iovec;
 468         msghdr.msg_iovlen = 1;
 469         /* output buffer for control messages */
 470         msghdr.msg_control = control_buffer;
 471         msghdr.msg_controllen = sizeof (control_buffer);
 472         /* flags; this is an output only field.. */
 473         msghdr.msg_flags = 0;
 474 #ifdef MSG_XPG4_2
 475         msghdr.msg_flags |= MSG_XPG4_2;
 476 #endif
 477
 478         payload_buffer_len = recvmsg (ph->fd, &msghdr, /* flags = */ 0);
 479         if (payload_buffer_len < 0)
 480         {
 481 #if WITH_DEBUG
 482                 char errbuf[PING_ERRMSG_LEN];
 483                 dprintf ("recvfrom: %s\n",
 484                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 485 #endif
 486                 return (-1);
 487         }
 488         dprintf ("Read %zi bytes from fd = %i\n", payload_buffer_len, ph->fd);
 489
 490         /* Iterate over all auxiliary data in msghdr */
 491         recv_ttl = -1;
 492         for (cmsg = CMSG_FIRSTHDR (&msghdr); /* {{{ */
 493                         cmsg != NULL;
 494                         cmsg = CMSG_NXTHDR (&msghdr, cmsg))
 495         {
 496                 if (ph->addrfamily == AF_INET) /* {{{ */
 497                 {
 498                         if (cmsg->cmsg_level != IPPROTO_IP)
 499                                 continue;
 500
 501                         if (cmsg->cmsg_type == IP_TTL)
 502                         {
 503                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 504                                                 sizeof (recv_ttl));
 505                                 dprintf ("TTLv4 = %i;\n", recv_ttl);
 506                         }
 507                         else
 508                         {
 509                                 dprintf ("Not handling option %i.\n",
 510                                                 cmsg->cmsg_type);
 511                         }
 512                 } /* }}} */
 513                 else if (ph->addrfamily == AF_INET6) /* {{{ */
 514                 {
 515                         if (cmsg->cmsg_level != IPPROTO_IPV6)
 516                                 continue;
 517
 518                         if (cmsg->cmsg_type == IPV6_HOPLIMIT)
 519                         {
 520                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
 521                                                 sizeof (recv_ttl));
 522                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
 523                         }
 524                         else
 525                         {
 526                                 dprintf ("Not handling option %i.\n",
 527                                                 cmsg->cmsg_type);
 528                         }
 529                 } /* }}} */
 530                 else
 531                 {
 532                         dprintf ("Don't know how to handle "
 533                                         "unknown protocol %i.\n",
 534                                         cmsg->cmsg_level);
 535                 }
 536         } /* }}} for (cmsg) */
 537
 538         if (ph->addrfamily == AF_INET)
 539         {
 540                 host = ping_receive_ipv4 (obj, payload_buffer, payload_buffer_len);
 541                 if (host == NULL)
 542                         return (-1);
 543         }
 544         else if (ph->addrfamily == AF_INET6)
 545         {
 546                 host = ping_receive_ipv6 (obj, payload_buffer, payload_buffer_len);
 547                 if (host == NULL)
 548                         return (-1);
 549         }
 550         else
 551         {
 552                 dprintf ("ping_receive_one: Unknown address family %i.\n",
 553                                 ph->addrfamily);
 554                 return (-1);
 555         }
 556
 557         dprintf ("rcvd: %12i.%06i\n",
 558                         (int) now->tv_sec,
 559                         (int) now->tv_usec);
 560         dprintf ("sent: %12i.%06i\n",
 561                         (int) host->timer->tv_sec,
 562                         (int) host->timer->tv_usec);
 563
 564         if (ping_timeval_sub (now, host->timer, &diff) < 0)
 565         {
 566                 timerclear (host->timer);
 567                 return (-1);
 568         }
 569
 570         dprintf ("diff: %12i.%06i\n",
 571                         (int) diff.tv_sec,
 572                         (int) diff.tv_usec);
 573
 574         if (recv_ttl >= 0)
 575                 host->recv_ttl = recv_ttl;
 576
 577         host->latency  = ((double) diff.tv_usec) / 1000.0;
 578         host->latency += ((double) diff.tv_sec)  * 1000.0;
 579
 580         timerclear (host->timer);
 581
 582         return (0);
 583 }
 584
 585 static int ping_receive_all (pingobj_t *obj)
 586 {
 587         fd_set readfds;
 588         int num_readfds;
 589         int max_readfds;
 590
 591         pinghost_t *ph;
 592         pinghost_t *ptr;
 593
 594         struct timeval endtime;
 595         struct timeval nowtime;
 596         struct timeval timeout;
 597         int status;
 598
 599         int ret;
 600
 601         ph = obj->head;
 602         ret = 0;
 603
 604         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 605         {
 606                 ptr->latency  = -1.0;
 607                 ptr->recv_ttl = -1;
 608         }
 609
 610         if (gettimeofday (&nowtime, NULL) == -1)
 611         {
 612                 ping_set_errno (obj, errno);
 613                 return (-1);
 614         }
 615
 616         /* Set up timeout */
 617         timeout.tv_sec = (time_t) obj->timeout;
 618         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
 619
 620         dprintf ("Set timeout to %i.%06i seconds\n",
 621                         (int) timeout.tv_sec,
 622                         (int) timeout.tv_usec);
 623
 624         ping_timeval_add (&nowtime, &timeout, &endtime);
 625
 626         while (1)
 627         {
 628                 FD_ZERO (&readfds);
 629                 num_readfds =  0;
 630                 max_readfds = -1;
 631
 632                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 633                 {
 634                         if (!timerisset (ptr->timer))
 635                                 continue;
 636
 637                         FD_SET (ptr->fd, &readfds);
 638                         num_readfds++;
 639
 640                         if (max_readfds < ptr->fd)
 641                                 max_readfds = ptr->fd;
 642                 }
 643
 644                 if (num_readfds == 0)
 645                         break;
 646
 647                 if (gettimeofday (&nowtime, NULL) == -1)
 648                 {
 649                         ping_set_errno (obj, errno);
 650                         return (-1);
 651                 }
 652
 653                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
 654                         break;
 655
 656                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_readfds,
 657                                 (int) timeout.tv_sec,
 658                                 (int) timeout.tv_usec);
 659
 660                 status = select (max_readfds + 1, &readfds, NULL, NULL, &timeout);
 661
 662                 if (gettimeofday (&nowtime, NULL) == -1)
 663                 {
 664                         ping_set_errno (obj, errno);
 665                         return (-1);
 666                 }
 667
 668                 if ((status == -1) && (errno == EINTR))
 669                 {
 670                         dprintf ("select was interrupted by signal..\n");
 671                         continue;
 672                 }
 673                 else if (status < 0)
 674                 {
 675 #if WITH_DEBUG
 676                         char errbuf[PING_ERRMSG_LEN];
 677                         dprintf ("select: %s\n",
 678                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 679 #endif
 680                         break;
 681                 }
 682                 else if (status == 0)
 683                 {
 684                         dprintf ("select timed out\n");
 685                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 686                                 if (ptr->latency < 0.0)
 687                                         ptr->dropped++;
 688                         break;
 689                 }
 690
 691                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
 692                 {
 693                         if (FD_ISSET (ptr->fd, &readfds))
 694                                 if (ping_receive_one (obj, ptr, &nowtime) == 0)
 695                                         ret++;
 696                 }
 697         } /* while (1) */
 698
 699         return (ret);
 700 }
 701
 702 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 703  * Sending functions:                                                        *
 704  *                                                                           *
 705  * ping_send_all                                                             *
 706  * +-> ping_send_one_ipv4                                                    *
 707  * `-> ping_send_one_ipv6                                                    *
 708  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 709 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
 710                 const void *buf, size_t buflen)
 711 {
 712         ssize_t ret;
 713
 714         if (gettimeofday (ph->timer, NULL) == -1)
 715         {
 716                 timerclear (ph->timer);
 717                 return (-1);
 718         }
 719
 720         ret = sendto (ph->fd, buf, buflen, 0,
 721                         (struct sockaddr *) ph->addr, ph->addrlen);
 722
 723         if (ret < 0)
 724         {
 725 #if defined(EHOSTUNREACH)
 726                 if (errno == EHOSTUNREACH)
 727                         return (0);
 728 #endif
 729 #if defined(ENETUNREACH)
 730                 if (errno == ENETUNREACH)
 731                         return (0);
 732 #endif
 733                 ping_set_errno (obj, errno);
 734         }
 735
 736         return (ret);
 737 }
 738
 739 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 740 {
 741         struct icmp *icmp4;
 742         int status;
 743
 744         char buf[4096];
 745         int  buflen;
 746
 747         char *data;
 748         int   datalen;
 749
 750         dprintf ("ph->hostname = %s\n", ph->hostname);
 751
 752         memset (buf, '\0', sizeof (buf));
 753         icmp4 = (struct icmp *) buf;
 754         data  = (char *) (icmp4 + 1);
 755
 756         icmp4->icmp_type  = ICMP_ECHO;
 757         icmp4->icmp_code  = 0;
 758         icmp4->icmp_cksum = 0;
 759         icmp4->icmp_id    = htons (ph->ident);
 760         icmp4->icmp_seq   = htons (ph->sequence);
 761
 762         buflen = 4096 - sizeof (struct icmp);
 763         strncpy (data, ph->data, buflen);
 764         datalen = strlen (data);
 765
 766         buflen = datalen + sizeof (struct icmp);
 767
 768         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
 769
 770         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
 771
 772         status = ping_sendto (obj, ph, buf, buflen);
 773         if (status < 0)
 774         {
 775                 perror ("ping_sendto");
 776                 return (-1);
 777         }
 778
 779         dprintf ("sendto: status = %i\n", status);
 780
 781         return (0);
 782 }
 783
 784 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 785 {
 786         struct icmp6_hdr *icmp6;
 787         int status;
 788
 789         char buf[4096];
 790         int  buflen;
 791
 792         char *data;
 793         int   datalen;
 794
 795         dprintf ("ph->hostname = %s\n", ph->hostname);
 796
 797         memset (buf, '\0', sizeof (buf));
 798         icmp6 = (struct icmp6_hdr *) buf;
 799         data  = (char *) (icmp6 + 1);
 800
 801         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
 802         icmp6->icmp6_code  = 0;
 803         /* The checksum will be calculated by the TCP/IP stack.  */
 804         /* FIXME */
 805         icmp6->icmp6_cksum = 0;
 806         icmp6->icmp6_id    = htons (ph->ident);
 807         icmp6->icmp6_seq   = htons (ph->sequence);
 808
 809         buflen = 4096 - sizeof (struct icmp6_hdr);
 810         strncpy (data, ph->data, buflen);
 811         datalen = strlen (data);
 812
 813         buflen = datalen + sizeof (struct icmp6_hdr);
 814
 815         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
 816
 817         status = ping_sendto (obj, ph, buf, buflen);
 818         if (status < 0)
 819         {
 820                 perror ("ping_sendto");
 821                 return (-1);
 822         }
 823
 824         dprintf ("sendto: status = %i\n", status);
 825
 826         return (0);
 827 }
 828
 829 static int ping_send_all (pingobj_t *obj)
 830 {
 831         pinghost_t *ph;
 832         pinghost_t *ptr;
 833
 834         int ret;
 835
 836         ret = 0;
 837         ph = obj->head;
 838
 839         for (ptr = ph; ptr != NULL; ptr = ptr->next)
 840         {
 841                 /* start timer.. The GNU `ping6' starts the timer before
 842                  * sending the packet, so I will do that too */
 843                 if (gettimeofday (ptr->timer, NULL) == -1)
 844                 {
 845 #if WITH_DEBUG
 846                         char errbuf[PING_ERRMSG_LEN];
 847                         dprintf ("gettimeofday: %s\n",
 848                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 849 #endif
 850                         timerclear (ptr->timer);
 851                         ret--;
 852                         continue;
 853                 }
 854                 else
 855                 {
 856                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
 857                 }
 858
 859                 if (ptr->addrfamily == AF_INET6)
 860                 {
 861                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
 862                         if (ping_send_one_ipv6 (obj, ptr) != 0)
 863                         {
 864                                 timerclear (ptr->timer);
 865                                 ret--;
 866                                 continue;
 867                         }
 868                 }
 869                 else if (ptr->addrfamily == AF_INET)
 870                 {
 871                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
 872                         if (ping_send_one_ipv4 (obj, ptr) != 0)
 873                         {
 874                                 timerclear (ptr->timer);
 875                                 ret--;
 876                                 continue;
 877                         }
 878                 }
 879                 else /* this should not happen */
 880                 {
 881                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
 882                         timerclear (ptr->timer);
 883                         ret--;
 884                         continue;
 885                 }
 886
 887                 ptr->sequence++;
 888         }
 889
 890         return (ret);
 891 }
 892
 893 /*
 894  * Set the TTL of a socket protocol independently.
 895  */
 896 static int ping_set_ttl (pinghost_t *ph, int ttl)
 897 {
 898         int ret = -2;
 899
 900         if (ph->addrfamily == AF_INET)
 901         {
 902                 dprintf ("Setting TTLv4 to %i\n", ttl);
 903                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL,
 904                                 &ttl, sizeof (ttl));
 905         }
 906         else if (ph->addrfamily == AF_INET6)
 907         {
 908                 dprintf ("Setting TTLv6 to %i\n", ttl);
 909                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
 910                                 &ttl, sizeof (ttl));
 911         }
 912
 913         return (ret);
 914 }
 915
 916 static int ping_get_ident (void)
 917 {
 918         int fd;
 919         static int did_seed = 0;
 920
 921         int retval;
 922
 923         if (did_seed == 0)
 924         {
 925                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
 926                 {
 927                         unsigned int seed;
 928
 929                         if (read (fd, &seed, sizeof (seed)) != -1)
 930                         {
 931                                 did_seed = 1;
 932                                 dprintf ("Random seed:   %#x\n", seed);
 933                                 srandom (seed);
 934                         }
 935
 936                         close (fd);
 937                 }
 938 #if WITH_DEBUG
 939                 else
 940                 {
 941                         char errbuf[PING_ERRMSG_LEN];
 942                         dprintf ("open (/dev/urandom): %s\n",
 943                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 944                 }
 945 #endif
 946         }
 947
 948         retval = (int) random ();
 949
 950         dprintf ("Random number: %#x\n", retval);
 951
 952         return (retval);
 953 }
 954
 955 static pinghost_t *ping_alloc (void)
 956 {
 957         pinghost_t *ph;
 958         size_t      ph_size;
 959
 960         ph_size = sizeof (pinghost_t)
 961                 + sizeof (struct sockaddr_storage)
 962                 + sizeof (struct timeval);
 963
 964         ph = (pinghost_t *) malloc (ph_size);
 965         if (ph == NULL)
 966                 return (NULL);
 967
 968         memset (ph, '\0', ph_size);
 969
 970         ph->timer   = (struct timeval *) (ph + 1);
 971         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
 972
 973         ph->addrlen = sizeof (struct sockaddr_storage);
 974         ph->fd      = -1;
 975         ph->latency = -1.0;
 976         ph->dropped = 0;
 977         ph->ident   = ping_get_ident () & 0xFFFF;
 978
 979         return (ph);
 980 }
 981
 982 static void ping_free (pinghost_t *ph)
 983 {
 984         if (ph->fd >= 0)
 985                 close (ph->fd);
 986
 987         if (ph->username != NULL)
 988                 free (ph->username);
 989
 990         if (ph->hostname != NULL)
 991                 free (ph->hostname);
 992
 993         if (ph->data != NULL)
 994                 free (ph->data);
 995
 996         free (ph);
 997 }
 998
 999 /*
1000  * public methods
1001  */
1002 const char *ping_get_error (pingobj_t *obj)
1003 {
1004         return (obj->errmsg);
1005 }
1006
1007 pingobj_t *ping_construct (void)
1008 {
1009         pingobj_t *obj;
1010
1011         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
1012                 return (NULL);
1013         memset (obj, '\0', sizeof (pingobj_t));
1014
1015         obj->timeout    = PING_DEF_TIMEOUT;
1016         obj->ttl        = PING_DEF_TTL;
1017         obj->addrfamily = PING_DEF_AF;
1018         obj->data       = strdup (PING_DEF_DATA);
1019
1020         return (obj);
1021 }
1022
1023 void ping_destroy (pingobj_t *obj)
1024 {
1025         pinghost_t *current;
1026         pinghost_t *next;
1027
1028         current = obj->head;
1029         next = NULL;
1030
1031         while (current != NULL)
1032         {
1033                 next = current->next;
1034                 ping_free (current);
1035                 current = next;
1036         }
1037
1038         if (obj->data != NULL)
1039                 free (obj->data);
1040
1041         if (obj->srcaddr != NULL)
1042                 free (obj->srcaddr);
1043
1044         free (obj);
1045
1046         return;
1047 }
1048
1049 int ping_setopt (pingobj_t *obj, int option, void *value)
1050 {
1051         int ret = 0;
1052
1053         switch (option)
1054         {
1055                 case PING_OPT_TIMEOUT:
1056                         obj->timeout = *((double *) value);
1057                         if (obj->timeout < 0.0)
1058                         {
1059                                 obj->timeout = PING_DEF_TIMEOUT;
1060                                 ret = -1;
1061                         }
1062                         break;
1063
1064                 case PING_OPT_TTL:
1065                         obj->ttl = *((int *) value);
1066                         if ((obj->ttl < 1) || (obj->ttl > 255))
1067                         {
1068                                 obj->ttl = PING_DEF_TTL;
1069                                 ret = -1;
1070                         }
1071                         else
1072                         {
1073                                 pinghost_t *ph;
1074
1075                                 for (ph = obj->head; ph != NULL; ph = ph->next)
1076                                         ping_set_ttl (ph, obj->ttl);
1077                         }
1078                         break;
1079
1080                 case PING_OPT_AF:
1081                         obj->addrfamily = *((int *) value);
1082                         if ((obj->addrfamily != AF_UNSPEC)
1083                                         && (obj->addrfamily != AF_INET)
1084                                         && (obj->addrfamily != AF_INET6))
1085                         {
1086                                 obj->addrfamily = PING_DEF_AF;
1087                                 ret = -1;
1088                         }
1089                         if (obj->srcaddr != NULL)
1090                         {
1091                                 free (obj->srcaddr);
1092                                 obj->srcaddr = NULL;
1093                         }
1094                         break;
1095
1096                 case PING_OPT_DATA:
1097                         if (obj->data != NULL)
1098                         {
1099                                 free (obj->data);
1100                                 obj->data = NULL;
1101                         }
1102                         obj->data = strdup ((const char *) value);
1103                         break;
1104
1105                 case PING_OPT_SOURCE:
1106                 {
1107                         char            *hostname = (char *) value;
1108                         struct addrinfo  ai_hints;
1109                         struct addrinfo *ai_list;
1110                         int              status;
1111 #if WITH_DEBUG
1112                         if (obj->addrfamily != AF_UNSPEC)
1113                         {
1114                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1115                         }
1116 #endif
1117                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1118                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1119 #if defined(AI_ADDRCONFIG)
1120                         ai_hints.ai_flags = AI_ADDRCONFIG;
1121 #endif
1122                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1123                         if (status != 0)
1124                         {
1125 #if defined(EAI_SYSTEM)
1126                                 char errbuf[PING_ERRMSG_LEN];
1127 #endif
1128                                 ping_set_error (obj, "getaddrinfo",
1129 #if defined(EAI_SYSTEM)
1130                                                 (status == EAI_SYSTEM)
1131                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1132 #endif
1133                                                 gai_strerror (status));
1134                                 ret = -1;
1135                                 break;
1136                         }
1137 #if WITH_DEBUG
1138                         if (ai_list->ai_next != NULL)
1139                         {
1140                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1141                         }
1142 #endif
1143                         if (obj->srcaddr == NULL)
1144                         {
1145                                 obj->srcaddrlen = 0;
1146                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1147                                 if (obj->srcaddr == NULL)
1148                                 {
1149                                         ping_set_errno (obj, errno);
1150                                         ret = -1;
1151                                         freeaddrinfo (ai_list);
1152                                         break;
1153                                 }
1154                         }
1155                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1156                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1157                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1158                                         ai_list->ai_addrlen);
1159                         obj->srcaddrlen = ai_list->ai_addrlen;
1160                         obj->addrfamily = ai_list->ai_family;
1161
1162                         freeaddrinfo (ai_list);
1163                 } /* case PING_OPT_SOURCE */
1164                 break;
1165
1166                 default:
1167                         ret = -2;
1168         } /* switch (option) */
1169
1170         return (ret);
1171 } /* int ping_setopt */
1172
1173
1174 int ping_send (pingobj_t *obj)
1175 {
1176         int ret;
1177
1178         if (ping_send_all (obj) < 0)
1179                 return (-1);
1180
1181         if ((ret = ping_receive_all (obj)) < 0)
1182                 return (-2);
1183
1184         return (ret);
1185 }
1186
1187 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1188 {
1189         while (ph != NULL)
1190         {
1191                 if (strcasecmp (ph->username, host) == 0)
1192                         break;
1193
1194                 ph = ph->next;
1195         }
1196
1197         return (ph);
1198 }
1199
1200 int ping_host_add (pingobj_t *obj, const char *host)
1201 {
1202         pinghost_t *ph;
1203
1204         struct addrinfo  ai_hints;
1205         struct addrinfo *ai_list, *ai_ptr;
1206         int              ai_return;
1207
1208         dprintf ("host = %s\n", host);
1209
1210         if (ping_host_search (obj->head, host) != NULL)
1211                 return (0);
1212
1213         memset (&ai_hints, '\0', sizeof (ai_hints));
1214         ai_hints.ai_flags     = 0;
1215 #ifdef AI_ADDRCONFIG
1216         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1217 #endif
1218 #ifdef AI_CANONNAME
1219         ai_hints.ai_flags    |= AI_CANONNAME;
1220 #endif
1221         ai_hints.ai_family    = obj->addrfamily;
1222         ai_hints.ai_socktype  = SOCK_RAW;
1223
1224         if ((ph = ping_alloc ()) == NULL)
1225         {
1226                 dprintf ("Out of memory!\n");
1227                 return (-1);
1228         }
1229
1230         if ((ph->username = strdup (host)) == NULL)
1231         {
1232                 dprintf ("Out of memory!\n");
1233                 ping_set_errno (obj, errno);
1234                 ping_free (ph);
1235                 return (-1);
1236         }
1237
1238         if ((ph->hostname = strdup (host)) == NULL)
1239         {
1240                 dprintf ("Out of memory!\n");
1241                 ping_set_errno (obj, errno);
1242                 ping_free (ph);
1243                 return (-1);
1244         }
1245
1246         /* obj->data is not garuanteed to be != NULL */
1247         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1248         {
1249                 dprintf ("Out of memory!\n");
1250                 ping_set_errno (obj, errno);
1251                 ping_free (ph);
1252                 return (-1);
1253         }
1254
1255         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1256         {
1257 #if defined(EAI_SYSTEM)
1258                 char errbuf[PING_ERRMSG_LEN];
1259 #endif
1260                 dprintf ("getaddrinfo failed\n");
1261                 ping_set_error (obj, "getaddrinfo",
1262 #if defined(EAI_SYSTEM)
1263                                                 (ai_return == EAI_SYSTEM)
1264                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1265 #endif
1266                                 gai_strerror (ai_return));
1267                 ping_free (ph);
1268                 return (-1);
1269         }
1270
1271         if (ai_list == NULL)
1272                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1273
1274         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1275         {
1276                 ph->fd = -1;
1277
1278                 if (ai_ptr->ai_family == AF_INET)
1279                 {
1280                         ai_ptr->ai_socktype = SOCK_RAW;
1281                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1282                 }
1283                 else if (ai_ptr->ai_family == AF_INET6)
1284                 {
1285                         ai_ptr->ai_socktype = SOCK_RAW;
1286                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1287                 }
1288                 else
1289                 {
1290                         char errmsg[PING_ERRMSG_LEN];
1291
1292                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1293                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1294
1295                         dprintf (errmsg);
1296                         ping_set_error (obj, "getaddrinfo", errmsg);
1297                         continue;
1298                 }
1299
1300                 /* TODO: Move this to a static function `ping_open_socket' and
1301                  * call it whenever the socket dies. */
1302                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1303                 if (ph->fd == -1)
1304                 {
1305 #if WITH_DEBUG
1306                         char errbuf[PING_ERRMSG_LEN];
1307                         dprintf ("socket: %s\n",
1308                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1309 #endif
1310                         ping_set_errno (obj, errno);
1311                         continue;
1312                 }
1313
1314                 if (obj->srcaddr != NULL)
1315                 {
1316                         assert (obj->srcaddrlen > 0);
1317                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1318
1319                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1320                         {
1321 #if WITH_DEBUG
1322                                 char errbuf[PING_ERRMSG_LEN];
1323                                 dprintf ("bind: %s\n",
1324                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1325 #endif
1326                                 ping_set_errno (obj, errno);
1327                                 close (ph->fd);
1328                                 ph->fd = -1;
1329                                 continue;
1330                         }
1331                 }
1332
1333                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1334                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1335                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1336                 ph->addrlen = ai_ptr->ai_addrlen;
1337                 ph->addrfamily = ai_ptr->ai_family;
1338
1339 #ifdef AI_CANONNAME
1340                 if ((ai_ptr->ai_canonname != NULL)
1341                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1342                 {
1343                         char *old_hostname;
1344
1345                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1346                                         ph->hostname, ai_ptr->ai_canonname);
1347
1348                         old_hostname = ph->hostname;
1349                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1350                         {
1351                                 /* strdup failed, falling back to old hostname */
1352                                 ph->hostname = old_hostname;
1353                         }
1354                         else if (old_hostname != NULL)
1355                         {
1356                                 free (old_hostname);
1357                         }
1358                 }
1359 #endif /* AI_CANONNAME */
1360
1361                 if (ph->addrfamily == AF_INET)
1362                 {
1363                         int opt = 1;
1364
1365                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1366                                         &opt, sizeof (opt));
1367                 }
1368 #if defined(IPPROTO_IPV6) && defined(IPV6_RECVHOPLIMIT)
1369                 else if (ph->addrfamily == AF_INET6)
1370                 {
1371                         int opt = 1;
1372
1373                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1374                                         &opt, sizeof (opt));
1375                 }
1376 #endif
1377
1378                 break;
1379         }
1380
1381         freeaddrinfo (ai_list);
1382
1383         if (ph->fd < 0)
1384         {
1385                 ping_free (ph);
1386                 return (-1);
1387         }
1388
1389         /*
1390          * Adding in the front is much easier, but then the iterator will
1391          * return the host that was added last as first host. That's just not
1392          * nice. -octo
1393          */
1394         if (obj->head == NULL)
1395         {
1396                 obj->head = ph;
1397         }
1398         else
1399         {
1400                 pinghost_t *hptr;
1401
1402                 hptr = obj->head;
1403                 while (hptr->next != NULL)
1404                         hptr = hptr->next;
1405
1406                 assert ((hptr != NULL) && (hptr->next == NULL));
1407                 hptr->next = ph;
1408         }
1409
1410         ping_set_ttl (ph, obj->ttl);
1411
1412         return (0);
1413 } /* int ping_host_add */
1414
1415 int ping_host_remove (pingobj_t *obj, const char *host)
1416 {
1417         pinghost_t *pre, *cur;
1418
1419         pre = NULL;
1420         cur = obj->head;
1421
1422         while (cur != NULL)
1423         {
1424                 if (strcasecmp (host, cur->username) == 0)
1425                         break;
1426
1427                 pre = cur;
1428                 cur = cur->next;
1429         }
1430
1431         if (cur == NULL)
1432         {
1433                 ping_set_error (obj, "ping_host_remove", "Host not found");
1434                 return (-1);
1435         }
1436
1437         if (pre == NULL)
1438                 obj->head = cur->next;
1439         else
1440                 pre->next = cur->next;
1441
1442         ping_free (cur);
1443
1444         return (0);
1445 }
1446
1447 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1448 {
1449         return ((pingobj_iter_t *) obj->head);
1450 }
1451
1452 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1453 {
1454         return ((pingobj_iter_t *) iter->next);
1455 }
1456
1457 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1458                 void *buffer, size_t *buffer_len)
1459 {
1460         int ret = EINVAL;
1461
1462         size_t orig_buffer_len = *buffer_len;
1463
1464         switch (info)
1465         {
1466                 case PING_INFO_USERNAME:
1467                         ret = ENOMEM;
1468                         *buffer_len = strlen (iter->username) + 1;
1469                         if (orig_buffer_len <= *buffer_len)
1470                                 break;
1471                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1472                          * will copy `*buffer_len' and pad the rest of
1473                          * `buffer' with null-bytes */
1474                         strncpy (buffer, iter->username, orig_buffer_len);
1475                         ret = 0;
1476                         break;
1477
1478                 case PING_INFO_HOSTNAME:
1479                         ret = ENOMEM;
1480                         *buffer_len = strlen (iter->hostname) + 1;
1481                         if (orig_buffer_len < *buffer_len)
1482                                 break;
1483                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1484                          * will copy `*buffer_len' and pad the rest of
1485                          * `buffer' with null-bytes */
1486                         strncpy (buffer, iter->hostname, orig_buffer_len);
1487                         ret = 0;
1488                         break;
1489
1490                 case PING_INFO_ADDRESS:
1491                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1492                                         iter->addrlen,
1493                                         (char *) buffer,
1494                                         *buffer_len,
1495                                         NULL, 0,
1496                                         NI_NUMERICHOST);
1497                         if (ret != 0)
1498                         {
1499                                 if ((ret == EAI_MEMORY)
1500 #ifdef EAI_OVERFLOW
1501                                                 || (ret == EAI_OVERFLOW)
1502 #endif
1503                                    )
1504                                         ret = ENOMEM;
1505 #if defined(EAI_SYSTEM)
1506                                 else if (ret == EAI_SYSTEM)
1507                                         ret = errno;
1508 #endif
1509                                 else
1510                                         ret = EINVAL;
1511                         }
1512                         break;
1513
1514                 case PING_INFO_FAMILY:
1515                         ret = ENOMEM;
1516                         *buffer_len = sizeof (int);
1517                         if (orig_buffer_len < sizeof (int))
1518                                 break;
1519                         *((int *) buffer) = iter->addrfamily;
1520                         ret = 0;
1521                         break;
1522
1523                 case PING_INFO_LATENCY:
1524                         ret = ENOMEM;
1525                         *buffer_len = sizeof (double);
1526                         if (orig_buffer_len < sizeof (double))
1527                                 break;
1528                         *((double *) buffer) = iter->latency;
1529                         ret = 0;
1530                         break;
1531
1532                 case PING_INFO_DROPPED:
1533                         ret = ENOMEM;
1534                         *buffer_len = sizeof (uint32_t);
1535                         if (orig_buffer_len < sizeof (uint32_t))
1536                                 break;
1537                         *((uint32_t *) buffer) = iter->dropped;
1538                         ret = 0;
1539                         break;
1540
1541                 case PING_INFO_SEQUENCE:
1542                         ret = ENOMEM;
1543                         *buffer_len = sizeof (unsigned int);
1544                         if (orig_buffer_len < sizeof (unsigned int))
1545                                 break;
1546                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1547                         ret = 0;
1548                         break;
1549
1550                 case PING_INFO_IDENT:
1551                         ret = ENOMEM;
1552                         *buffer_len = sizeof (uint16_t);
1553                         if (orig_buffer_len < sizeof (uint16_t))
1554                                 break;
1555                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1556                         ret = 0;
1557                         break;
1558
1559                 case PING_INFO_DATA:
1560                         ret = ENOMEM;
1561                         *buffer_len = strlen (iter->data);
1562                         if (orig_buffer_len < *buffer_len)
1563                                 break;
1564                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1565                         ret = 0;
1566                         break;
1567
1568                 case PING_INFO_RECV_TTL:
1569                         ret = ENOMEM;
1570                         *buffer_len = sizeof (int);
1571                         if (orig_buffer_len < sizeof (int))
1572                                 break;
1573                         *((int *) buffer) = iter->recv_ttl;
1574                         ret = 0;
1575                         break;
1576         }
1577
1578         return (ret);
1579 } /* ping_iterator_get_info */
1580
1581 void *ping_iterator_get_context (pingobj_iter_t *iter)
1582 {
1583         return (iter->context);
1584 }
1585
1586 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1587 {
1588         iter->context = context;
1589 }