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dn_expand(3)
NAME
  dn_expand - Expand a compressed domain name

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 );

LIBRARY
  Standard C Library (libc)

PARAMETERS
  message_ptr
      Specifies a pointer to the beginning of a message.

  end_of_message
      Points to the end of the original message that contains the compressed
      domain name.

  compressed_name
      Specifies a pointer to a compressed domain name.

  expanded_name
      Specifies a pointer to a buffer that holds the resulting expanded
      domain name.

  length
      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
  /etc/resolv.conf
      Defines name server and domain name constants, structures, and values.

SEE ALSO
  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).

Index for Section 3

Alphabetical listing for D

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