/*

Copyright 1988, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its

documentation for any purpose is hereby granted without fee, provided that

the above copyright notice appear in all copies and that both that

copyright notice and this permission notice appear in supporting

documentation.

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE

OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be

used in advertising or otherwise to promote the sale, use or other dealings

in this Software without prior written authorization from The Open Group.

*/

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <X11/Xauth.h>

#include <X11/Xos.h>

#define binaryEqual(a, b, len) (memcmp(a, b, len) == 0)

Xauth *

XauGetAuthByAddr (

#if NeedWidePrototypes

unsigned int	family,

unsigned int	address_length,

#else

unsigned short	family,

unsigned short	address_length,

#endif

_Xconst char*	address,

#if NeedWidePrototypes

unsigned int	number_length,

#else

unsigned short	number_length,

#endif

_Xconst char*	number,

#if NeedWidePrototypes

unsigned int	name_length,

#else

unsigned short	name_length,

#endif

_Xconst char*	name)

{

    FILE    *auth_file;

    char    *auth_name;

    Xauth   *entry;

    auth_name = XauFileName ();

    if (!auth_name)

	return NULL;

    if (access (auth_name, R_OK) != 0)		/* checks REAL id */

	return NULL;

    auth_file = fopen (auth_name, "rb");

    if (!auth_file)

	return NULL;

    for (;;) {

	entry = XauReadAuth (auth_file);

	if (!entry)

	    break;

	/*

	 * Match when:

	 *   either family or entry->family are FamilyWild or

	 *    family and entry->family are the same and

	 *     address and entry->address are the same

	 *  and

	 *   either number or entry->number are empty or

	 *    number and entry->number are the same

	 *  and

	 *   either name or entry->name are empty or

	 *    name and entry->name are the same

	 */

	if ((family == FamilyWild || entry->family == FamilyWild ||

	     (entry->family == family &&

	      address_length == entry->address_length &&

	      binaryEqual (entry->address, address, address_length))) &&

	    (number_length == 0 || entry->number_length == 0 ||

	     (number_length == entry->number_length &&

	      binaryEqual (entry->number, number, number_length))) &&

	    (name_length == 0 || entry->name_length == 0 ||

	     (entry->name_length == name_length &&

	      binaryEqual (entry->name, name, name_length))))

	    break;

	XauDisposeAuth (entry);

    }

    (void) fclose (auth_file);

    return entry;

}