release_v2.0/3rdparty/libexosip2-5.3.0/src/inet_ntop.c

/*
  eXosip - This is the eXtended osip library.
  Copyright (C) 2001-2020 Aymeric MOIZARD amoizard@antisip.com
  eXosip is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.
  eXosip is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  In addition, as a special exception, the copyright holders give
  permission to link the code of portions of this program with the
  OpenSSL library under certain conditions as described in each
  individual source file, and distribute linked combinations
  including the two.
  You must obey the GNU General Public License in all respects
  for all of the code used other than OpenSSL.  If you modify
  file(s) with this exception, you may extend this exception to your
  version of the file(s), but you are not obligated to do so.  If you
  do not wish to do so, delete this exception statement from your
  version.  If you delete this exception statement from all source
  files in the program, then also delete it here.
*/
/* This is from the BIND 4.9.4 release, modified to compile by itself */
/* Copyright (c) 1996 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */
#include "eXosip2.h"
#if !defined(HAVE_INET_NTOP)
/* This is windows replacement for inet_ntop */
#include "inet_ntop.h"
#if !defined(_WIN32_WCE)
#include <errno.h>
#endif
/* added by amd */
typedef unsigned __int32 uint32_t;
/* !added by amd */
#define IN6ADDRSZ 16
#define INT16SZ 2
#ifndef AF_INET6
#define AF_INET6 AF_MAX + 1 /* just to let this compile */
#endif
/*
 * WARNING: Don't even consider trying to compile this on a system where
 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
 */
static const char *_inet_ntop4(const u_char *src, char *dst, size_t size);
static const char *_inet_ntop6(const u_char *src, char *dst, size_t size);
/* char *
 * inet_ntop(af, src, dst, size)
 *  convert a network format address to presentation format.
 * return:
 *  pointer to presentation format address (`dst'), or NULL (see errno).
 * author:
 *  Paul Vixie, 1996.
 */
const char *_inet_ntop(af, src, dst, size) int af;
const void *src;
char *dst;
size_t size;
{
  switch (af) {
  case AF_INET:
    return (_inet_ntop4(src, dst, size));
  case AF_INET6:
    return (_inet_ntop6(src, dst, size));
  default:
#ifndef _WIN32_WCE
    errno = WSAEAFNOSUPPORT;
#endif
    return (NULL);
  }
  /* NOTREACHED */
}
/* const char *
 * inet_ntop4(src, dst, size)
 *  format an IPv4 address, more or less like inet_ntoa()
 * return:
 *  `dst' (as a const)
 * notes:
 *  (1) uses no statics
 *  (2) takes a u_char* not an in_addr as input
 * author:
 *  Paul Vixie, 1996.
 */
static const char *_inet_ntop4(src, dst, size) const u_char *src;
char *dst;
size_t size;
{
  static const char fmt[] = "%u.%u.%u.%u";
  char tmp[sizeof "255.255.255.255"];
  sprintf(tmp, fmt, src[0], src[1], src[2], src[3]);
  if ((size_t) strlen(tmp) >= size) {
#ifndef _WIN32_WCE
    errno = ENOSPC;
#endif
    return (NULL);
  }
  strcpy(dst, tmp);
  return (dst);
}
/* const char *
 * inet_ntop6(src, dst, size)
 *  convert IPv6 binary address into presentation (printable) format
 * author:
 *  Paul Vixie, 1996.
 */
static const char *_inet_ntop6(src, dst, size) const u_char *src;
char *dst;
size_t size;
{
  /*
   * Note that int32_t and int16_t need only be "at least" large enough
   * to contain a value of the specified size.  On some systems, like
   * Crays, there is no such thing as an integer variable with 16 bits.
   * Keep this in mind if you think this function should have been coded
   * to use pointer overlays.  All the world's not a VAX.
   */
  char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
  struct {
    int base, len;
  } best, cur;
  uint32_t words[IN6ADDRSZ / INT16SZ];
  int i;
  /*
   * Preprocess:
   *      Copy the input (bytewise) array into a wordwise array.
   *      Find the longest run of 0x00's in src[] for :: shorthanding.
   */
  memset(words, 0, sizeof words);
  for (i = 0; i < IN6ADDRSZ; i++)
    words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
  best.base = -1;
  best.len = 0;
  cur.base = -1;
  cur.len = 0;
  for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
    if (words[i] == 0) {
      if (cur.base == -1)
        cur.base = i, cur.len = 1;
      else
        cur.len++;
    } else {
      if (cur.base != -1) {
        if (best.base == -1 || cur.len > best.len)
          best = cur;
        cur.base = -1;
      }
    }
  }
  if (cur.base != -1) {
    if (best.base == -1 || cur.len > best.len)
      best = cur;
  }
  if (best.base != -1 && best.len < 2)
    best.base = -1;
  /*
   * Format the result.
   */
  tp = tmp;
  for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
    /* Are we inside the best run of 0x00's? */
    if (best.base != -1 && i >= best.base && i < (best.base + best.len)) {
      if (i == best.base)
        *tp++ = ':';
      continue;
    }
    /* Are we following an initial run of 0x00s or any real hex? */
    if (i != 0)
      *tp++ = ':';
    /* Is this address an encapsulated IPv4? */
    if (i == 6 && best.base == 0 && (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
      if (!_inet_ntop4(src + 12, tp, sizeof tmp - (tp - tmp)))
        return (NULL);
      tp += strlen(tp);
      break;
    }
    sprintf(tp, "%x", words[i]);
    tp += strlen(tp);
  }
  /* Was it a trailing run of 0x00's? */
  if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
    *tp++ = ':';
  *tp++ = '\0';
  /*
   * Check for overflow, copy, and we're done.
   */
  if ((size_t)(tp - tmp) > size) {
#if !defined(_WIN32_WCE)
    errno = ENOSPC;
#endif
    return (NULL);
  }
  strcpy(dst, tmp);
  return (dst);
}
#endif