/*
 * Copyright (c) 1990 Jan-Simon Pendry
 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry at Imperial College, London.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 *	from: @(#)misc_rpc.c	8.1 (Berkeley) 6/6/93
 *	$Id: misc_rpc.c,v 1.7 2003/06/02 23:36:51 millert Exp $
 */

/*
 * Additions to Sun RPC.
 */

#include "am.h"

void	rpc_msg_init(struct rpc_msg *, u_long, u_long, u_long);
int	pickup_rpc_reply(void *, int, void *, xdrproc_t);
int	make_rpc_packet(char *, int, unsigned long, struct rpc_msg *,
    void *, xdrproc_t, AUTH *);

void
rpc_msg_init(struct rpc_msg *mp, unsigned long prog,
    unsigned long vers, unsigned long proc)
{
	/*
	 * Initialise the message
	 */
	bzero((void *)mp, sizeof(*mp));
	mp->rm_xid = 0;
	mp->rm_direction = CALL;
	mp->rm_call.cb_rpcvers = RPC_MSG_VERSION;
	mp->rm_call.cb_prog = prog;
	mp->rm_call.cb_vers = vers;
	mp->rm_call.cb_proc = proc;
}

/*
 * Field reply to call to mountd
 */
int
pickup_rpc_reply(void *pkt, int len, void *where, xdrproc_t where_xdr)
{
	XDR reply_xdr;
	int ok;
	struct rpc_err err;
	struct rpc_msg reply_msg;
	int error = 0;

	/*bzero((void *)&err, sizeof(err));*/
	bzero((void *)&reply_msg, sizeof(reply_msg));

	reply_msg.acpted_rply.ar_results.where = (caddr_t) where;
	reply_msg.acpted_rply.ar_results.proc = where_xdr;

	xdrmem_create(&reply_xdr, pkt, len, XDR_DECODE);

	ok = xdr_replymsg(&reply_xdr, &reply_msg);
	if (!ok) {
		error = EIO;
		goto drop;
	}
	_seterr_reply(&reply_msg, &err);
	if (err.re_status != RPC_SUCCESS) {
		error = EIO;
		goto drop;
	}

drop:
	if (reply_msg.rm_reply.rp_stat == MSG_ACCEPTED &&
			reply_msg.acpted_rply.ar_verf.oa_base) {
		reply_xdr.x_op = XDR_FREE;
		(void)xdr_opaque_auth(&reply_xdr,
			&reply_msg.acpted_rply.ar_verf);
	}
	xdr_destroy(&reply_xdr);

	return error;
}

int
make_rpc_packet(char *buf, int buflen, unsigned long proc,
    struct rpc_msg *mp, void *arg, xdrproc_t arg_xdr, AUTH *auth)
{
	XDR msg_xdr;
	int len;

	xdrmem_create(&msg_xdr, buf, buflen, XDR_ENCODE);
	/*
	 * Basic protocol header
	 */
	if (!xdr_callhdr(&msg_xdr, mp))
		return -EIO;
	/*
	 * Called procedure number
	 */
	if (!xdr_u_long(&msg_xdr, &proc))
		return -EIO;
	/*
	 * Authorization
	 */
	if (!AUTH_MARSHALL(auth, &msg_xdr))
		return -EIO;
	/*
	 * Arguments
	 */
	if (!(*arg_xdr)(&msg_xdr, arg))
		return -EIO;
	/*
	 * Determine length
	 */
	len = xdr_getpos(&msg_xdr);
	/*
	 * Throw away xdr
	 */
	xdr_destroy(&msg_xdr);
	return len;
}