ares_expand_name(3)

ARES_EXPAND_NAME(3)    C LIBRARY FUNCTIONS    ARES_EXPAND_NAME(3)

NAME

     ares_expand_name - Expand a DNS-encoded domain name

SYNOPSIS

     #include <ares.h>

     int ares_expand_name(const unsigned char *encoded,
     const unsigned char *abuf, int alen,
          long *enclen)

DESCRIPTION

     The ares_expand_name function converts a DNS-encoded  domain
     name  to  a  dot-separated  C  string.  The argument encoded
     gives the beginning of the  encoded  domain  name,  and  the
     arguments  abuf  and alen give the containing message buffer
     (necessary for the processing of indirection pointers within
     the  encoded  domain  name).  The result is placed in a NUL-
     terminated allocated buffer, a pointer to which is stored in
     the  variable  pointed  to  by s.  The length of the encoded
     name is stored in the variable pointed to by enclen so  that
     the  caller can advance past the encoded domain name to read
     further data in the message.

     Use ares_free_string(3) to free the allocated hostname.

RETURN VALUES

     ares_expand_name can return any of the following values:

     ARES_SUCCESS   Expansion of the encoded name succeeded.

     ARES_EBADNAME  The encoded domain  name  was  malformed  and
                    could not be expanded.

     ARES_ENOMEM    Memory was exhausted.

SEE ALSO

     ares_mkquery(3),ares_free_string(3)

AUTHOR

     Greg Hudson, MIT Information Systems
     Copyright 1998 by the Massachusetts Institute of Technology.

                    Last change: 20 Nov 2009                    1