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libcares/inet_net_pton.c  view on Meta::CPAN

/*
 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
 * Copyright (c) 1996,1999 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 ISC DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC 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 "ares_setup.h"

#ifdef HAVE_NETINET_IN_H
#  include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#  include <arpa/inet.h>
#endif
#ifdef HAVE_ARPA_NAMESER_H
#  include <arpa/nameser.h>
#else
#  include "nameser.h"
#endif
#ifdef HAVE_ARPA_NAMESER_COMPAT_H
#  include <arpa/nameser_compat.h>
#endif

#include "ares.h"
#include "ares_ipv6.h"
#include "ares_nowarn.h"
#include "ares_inet_net_pton.h"


const struct ares_in6_addr ares_in6addr_any = { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } };


#ifndef HAVE_INET_NET_PTON

/*
 * static int
 * inet_net_pton_ipv4(src, dst, size)
 *      convert IPv4 network number from presentation to network format.
 *      accepts hex octets, hex strings, decimal octets, and /CIDR.
 *      "size" is in bytes and describes "dst".
 * return:
 *      number of bits, either imputed classfully or specified with /CIDR,
 *      or -1 if some failure occurred (check errno).  ENOENT means it was
 *      not an IPv4 network specification.
 * note:
 *      network byte order assumed.  this means 192.5.5.240/28 has
 *      0b11110000 in its fourth octet.
 * note:
 *      On Windows we store the error in the thread errno, not
 *      in the winsock error code. This is to avoid loosing the
 *      actual last winsock error. So use macro ERRNO to fetch the
 *      errno this funtion sets when returning (-1), not SOCKERRNO.
 * author:
 *      Paul Vixie (ISC), June 1996
 */
static int
inet_net_pton_ipv4(const char *src, unsigned char *dst, size_t size)
{
  static const char xdigits[] = "0123456789abcdef";
  static const char digits[] = "0123456789";
  int n, ch, tmp = 0, dirty, bits;
  const unsigned char *odst = dst;

  ch = *src++;
  if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
      && ISASCII(src[1])
      && ISXDIGIT(src[1])) {
    /* Hexadecimal: Eat nybble string. */
    if (!size)
      goto emsgsize;
    dirty = 0;
    src++;  /* skip x or X. */
    while ((ch = *src++) != '\0' && ISASCII(ch) && ISXDIGIT(ch)) {
      if (ISUPPER(ch))
        ch = tolower(ch);
      n = aresx_sztosi(strchr(xdigits, ch) - xdigits);
      if (dirty == 0)
        tmp = n;
      else
        tmp = (tmp << 4) | n;
      if (++dirty == 2) {
        if (!size--)
          goto emsgsize;
        *dst++ = (unsigned char) tmp;
        dirty = 0;
      }
    }
    if (dirty) {  /* Odd trailing nybble? */
      if (!size--)
        goto emsgsize;
      *dst++ = (unsigned char) (tmp << 4);
    }
  } else if (ISASCII(ch) && ISDIGIT(ch)) {
    /* Decimal: eat dotted digit string. */
    for (;;) {
      tmp = 0;
      do {
        n = aresx_sztosi(strchr(digits, ch) - digits);
        tmp *= 10;
        tmp += n;
        if (tmp > 255)
          goto enoent;
      } while ((ch = *src++) != '\0' &&
               ISASCII(ch) && ISDIGIT(ch));
      if (!size--)
        goto emsgsize;
      *dst++ = (unsigned char) tmp;
      if (ch == '\0' || ch == '/')
        break;

libcares/inet_net_pton.c  view on Meta::CPAN

    if (tp + NS_INT16SZ > endp)
      goto enoent;
    *tp++ = (unsigned char)((val >> 8) & 0xff);
    *tp++ = (unsigned char)(val & 0xff);
  }
  if (bits == -1)
    bits = 128;

  words = (bits + 15) / 16;
  if (words < 2)
    words = 2;
  if (ipv4)
    words = 8;
  endp =  tmp + 2 * words;

  if (colonp != NULL) {
    /*
     * Since some memmove()'s erroneously fail to handle
     * overlapping regions, we'll do the shift by hand.
     */
    const ares_ssize_t n = tp - colonp;
    ares_ssize_t i;

    if (tp == endp)
      goto enoent;
    for (i = 1; i <= n; i++) {
      *(endp - i) = *(colonp + n - i);
      *(colonp + n - i) = 0;
    }
    tp = endp;
  }
  if (tp != endp)
    goto enoent;

  bytes = (bits + 7) / 8;
  if (bytes > size)
    goto emsgsize;
  memcpy(dst, tmp, bytes);
  return (bits);

  enoent:
  SET_ERRNO(ENOENT);
  return (-1);

  emsgsize:
  SET_ERRNO(EMSGSIZE);
  return (-1);
}

/*
 * int
 * inet_net_pton(af, src, dst, size)
 *      convert network number from presentation to network format.
 *      accepts hex octets, hex strings, decimal octets, and /CIDR.
 *      "size" is in bytes and describes "dst".
 * return:
 *      number of bits, either imputed classfully or specified with /CIDR,
 *      or -1 if some failure occurred (check errno).  ENOENT means it was
 *      not a valid network specification.
 * note:
 *      On Windows we store the error in the thread errno, not
 *      in the winsock error code. This is to avoid loosing the
 *      actual last winsock error. So use macro ERRNO to fetch the
 *      errno this funtion sets when returning (-1), not SOCKERRNO.
 * author:
 *      Paul Vixie (ISC), June 1996
 */
int
ares_inet_net_pton(int af, const char *src, void *dst, size_t size)
{
  switch (af) {
  case AF_INET:
    return (inet_net_pton_ipv4(src, dst, size));
  case AF_INET6:
    return (inet_net_pton_ipv6(src, dst, size));
  default:
    SET_ERRNO(EAFNOSUPPORT);
    return (-1);
  }
}

#endif /* HAVE_INET_NET_PTON */

#ifndef HAVE_INET_PTON
int ares_inet_pton(int af, const char *src, void *dst)
{
  int result;
  size_t size;

  if (af == AF_INET)
    size = sizeof(struct in_addr);
  else if (af == AF_INET6)
    size = sizeof(struct ares_in6_addr);
  else
  {
    SET_ERRNO(EAFNOSUPPORT);
    return -1;
  }
  result = ares_inet_net_pton(af, src, dst, size);
  if (result == -1 && ERRNO == ENOENT)
    return 0;
  return (result > -1 ? 1 : -1);
}
#else /* HAVE_INET_PTON */
int ares_inet_pton(int af, const char *src, void *dst)
{
  /* just relay this to the underlying function */
  return inet_pton(af, src, dst);
}

#endif