/*

 * Copyright (c) 2009, Sun Microsystems, Inc.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 * - Redistributions of source code must retain the above copyright notice,

 *   this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright notice,

 *   this list of conditions and the following disclaimer in the documentation

 *   and/or other materials provided with the distribution.

 * - Neither the name of Sun Microsystems, Inc. nor the names of its

 *   contributors may be used to endorse or promote products derived

 *   from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 */

/*

#if defined(LIBC_SCCS) && !defined(lint)

static char *sccsid = "@(#)auth_none.c 1.19 87/08/11 Copyr 1984 Sun Micro";

static char *sccsid = "@(#)auth_none.c	2.1 88/07/29 4.0 RPCSRC";

#endif

__FBSDID("$FreeBSD: src/lib/libc/rpc/auth_none.c,v 1.12 2002/03/22 23:18:35 obrien Exp $");

*/

/*

 * auth_none.c

 * Creates a client authentication handle for passing "null"

 * credentials and verifiers to remote systems.

 *

 * Copyright (C) 1984, Sun Microsystems, Inc.

 */

#include <pthread.h>

#include <reentrant.h>

#include <assert.h>

#include <stdlib.h>

#include <rpc/types.h>

#include <rpc/xdr.h>

#include <rpc/auth.h>

#define MAX_MARSHAL_SIZE 20

/*

 * Authenticator operations routines

 */

static bool_t authnone_marshal (AUTH *, XDR *);

static void authnone_verf (AUTH *);

static bool_t authnone_validate (AUTH *, struct opaque_auth *);

static bool_t authnone_refresh (AUTH *, void *);

static void authnone_destroy (AUTH *);

extern bool_t xdr_opaque_auth();

static struct auth_ops *authnone_ops();

static struct authnone_private {

	AUTH	no_client;

	char	marshalled_client[MAX_MARSHAL_SIZE];

	u_int	mcnt;

} *authnone_private;

AUTH *

authnone_create()

{

	struct authnone_private *ap = authnone_private;

	XDR xdr_stream;

	XDR *xdrs;

	extern mutex_t authnone_lock;

	mutex_lock(&authnone_lock);

	if (ap == 0) {

		ap = (struct authnone_private *)calloc(1, sizeof (*ap));

		if (ap == 0) {

			mutex_unlock(&authnone_lock);

			return (0);

		}

		authnone_private = ap;

	}

	if (!ap->mcnt) {

		ap->no_client.ah_cred = ap->no_client.ah_verf = _null_auth;

		ap->no_client.ah_ops = authnone_ops();

		xdrs = &xdr_stream;

		xdrmem_create(xdrs, ap->marshalled_client,

		    (u_int)MAX_MARSHAL_SIZE, XDR_ENCODE);

		(void)xdr_opaque_auth(xdrs, &ap->no_client.ah_cred);

		(void)xdr_opaque_auth(xdrs, &ap->no_client.ah_verf);

		ap->mcnt = XDR_GETPOS(xdrs);

		XDR_DESTROY(xdrs);

	}

	mutex_unlock(&authnone_lock);

	return (&ap->no_client);

}

/*ARGSUSED*/

static bool_t

authnone_marshal(AUTH *client, XDR *xdrs)

{

	struct authnone_private *ap;

	bool_t rv = FALSE;

	extern mutex_t authnone_lock;

	assert(xdrs != NULL);

	mutex_lock(&authnone_lock);

	ap = authnone_private;

	if (ap) {

		rv = (*xdrs->x_ops->x_putbytes)(xdrs, ap->marshalled_client,

					        ap->mcnt);

	}

	mutex_unlock(&authnone_lock);

	return (rv);

}

/* All these unused parameters are required to keep ANSI-C from grumbling */

/*ARGSUSED*/

static void

authnone_verf(AUTH *client)

{

}

/*ARGSUSED*/

static bool_t

authnone_validate(AUTH *client, struct opaque_auth *opaque)

{

	return (TRUE);

}

/*ARGSUSED*/

static bool_t

authnone_refresh(AUTH *client, void *dummy)

{

	return (FALSE);

}

/*ARGSUSED*/

static void

authnone_destroy(AUTH *client)

{

}

static bool_t

authnone_wrap(AUTH *auth, XDR *xdrs, xdrproc_t xfunc, caddr_t xwhere)

{

	return ((*xfunc)(xdrs, xwhere));

}

static struct auth_ops *

authnone_ops()

{

	static struct auth_ops ops;

	extern mutex_t ops_lock;

/* VARIABLES PROTECTED BY ops_lock: ops */

	mutex_lock(&ops_lock);

	if (ops.ah_nextverf == NULL) {

		ops.ah_nextverf = authnone_verf;

		ops.ah_marshal = authnone_marshal;

		ops.ah_validate = authnone_validate;

		ops.ah_refresh = authnone_refresh;

		ops.ah_destroy = authnone_destroy;

		ops.ah_wrap = authnone_wrap;

		ops.ah_unwrap = authnone_wrap;

	}

	mutex_unlock(&ops_lock);

	return (&ops;;

}