resolv/ns_name_uncompress.c

   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