dn_expand(3)						     Library Functions Manual						      dn_expand(3)

NAME

       dn_expand - Expands a compressed domain name

LIBRARY

       Standard C Library (libc.a, libc.so)

SYNOPSIS

       #include <sys/types.h> #include <netinet/in.h> #include <arpa/nameser.h> #include <resolv.h>

       int dn_expand (
	   const u_char *message_ptr,
	   const u_char *end_of_message,
	   const u_char *compressed_name,
	   char *expanded_name,
	   int length );

PARAMETERS

       Specifies  a  pointer  to  the beginning of a message.  Points to the end of the original message that contains the compressed domain name.
       Specifies a pointer to a compressed domain name.  Specifies a pointer to a buffer that holds the resulting expanded domain name.  Specifies
       the size of the buffer pointed to by the expanded_name parameter.

DESCRIPTION

       The dn_expand() function expands a compressed domain name to a full domain name, converting the expanded names to uppercase.

       The  dn_expand()  function  is  one  of a set of subroutines that form the resolver, a set of functions that resolves domain names.  Global
       information that is used by the resolver functions is kept in the _res data structure.	The   /include/resolv.h  file  contains  the  _res
       structure definition.

RETURN VALUES

       Upon successful completion, the dn_expand() function returns the size of the compressed domain name.  Otherwise, a value of -1 is returned.

ERRORS

       If  an  error  occurs  during  a  resolver  operation,  the h_errno external variable is set.  Error code values and reasons are defined in
       <netdb.h>.

FILES

       Defines name server and domain name constants, structures, and values.

RELATED INFORMATION

       Functions: dn_comp(3), dn_find(3), dn_skipname(3),  putshort(3),  putlong(3),  res_init(3),  res_mkquery(3),  res_query(3),  res_search(3),
       res_send(3), _getshort(3), _getlong(3).	delim off

																      dn_expand(3)