1  /* Expand compressed domain name to presentation format.
       2   * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
       3   * Copyright (c) 1996,1999 by Internet Software Consortium.
       4   *
       5   * Permission to use, copy, modify, and distribute this software for any
       6   * purpose with or without fee is hereby granted, provided that the above
       7   * copyright notice and this permission notice appear in all copies.
       8   *
       9   * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
      10   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      11   * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
      12   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      13   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
      14   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
      15   * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
      16   */
      17  
      18  #include <arpa/nameser.h>
      19  #include <shlib-compat.h>
      20  
      21  /* Expand compressed domain name to presentation format.  Returns the
      22     number of bytes read out of `src', or -1 (with errno set).  The
      23     root domain is returned as ".", not "".  */
      24  int
      25  ___ns_name_uncompress (const unsigned char *msg, const unsigned char *eom,
      26                         const unsigned char *src, char *dst, size_t dstsiz)
      27  {
      28    unsigned char tmp[NS_MAXCDNAME];
      29    int n = __ns_name_unpack (msg, eom, src, tmp, sizeof tmp);
      30    if (n < 0)
      31      return -1;
      32    if (__ns_name_ntop (tmp, dst, dstsiz) < 0)
      33      return -1;
      34    return n;
      35  }
      36  versioned_symbol (libc, ___ns_name_uncompress, ns_name_uncompress,
      37                    GLIBC_2_34);
      38  versioned_symbol (libc, ___ns_name_uncompress, __ns_name_uncompress,
      39                    GLIBC_PRIVATE);
      40  libc_hidden_ver (___ns_name_uncompress, __ns_name_uncompress)
      41  
      42  #if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_9, GLIBC_2_34)
      43  compat_symbol (libresolv, ___ns_name_uncompress, ns_name_uncompress,
      44                 GLIBC_2_9);
      45  #endif