/*	$NetBSD: svc_raw.c,v 1.14 2000/07/06 03:10:35 christos Exp $	*/

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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.
 */
/*
 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 
 */

/* #ident	"@(#)svc_raw.c	1.16	94/04/24 SMI" */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)svc_raw.c 1.25 89/01/31 Copyr 1984 Sun Micro";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * svc_raw.c,   This a toy for simple testing and timing.
 * Interface to create an rpc client and server in the same UNIX process.
 * This lets us similate rpc and get rpc (round trip) overhead, without
 * any interference from the kernel.
 *
 */

#include "namespace.h"
#include "reentrant.h"
#include <rpc/rpc.h>
#include <sys/types.h>
#include <rpc/raw.h>
#include <stdlib.h>
#include "un-namespace.h"
#include "mt_misc.h"

#ifndef UDPMSGSIZE
#define	UDPMSGSIZE 8800
#endif

/*
 * This is the "network" that we will be moving data over
 */
static struct svc_raw_private {
	char	*raw_buf;	/* should be shared with the cl handle */
	SVCXPRT	*server;
	XDR	xdr_stream;
	char	verf_body[MAX_AUTH_BYTES];
} *svc_raw_private;

static enum xprt_stat svc_raw_stat(SVCXPRT *);
static bool_t svc_raw_recv(SVCXPRT *, struct rpc_msg *);
static bool_t svc_raw_reply(SVCXPRT *, struct rpc_msg *);
static bool_t svc_raw_getargs(SVCXPRT *, xdrproc_t, void *);
static bool_t svc_raw_freeargs(SVCXPRT *, xdrproc_t, void *);
static void svc_raw_destroy(SVCXPRT *);
static void svc_raw_ops(SVCXPRT *);
static bool_t svc_raw_control(SVCXPRT *, const u_int, void *);

char *__rpc_rawcombuf = NULL;

SVCXPRT *
svc_raw_create(void)
{
	struct svc_raw_private *srp;
/* VARIABLES PROTECTED BY svcraw_lock: svc_raw_private, srp */

	mutex_lock(&svcraw_lock);
	srp = svc_raw_private;
	if (srp == NULL) {
		srp = (struct svc_raw_private *)calloc(1, sizeof (*srp));
		if (srp == NULL) {
			mutex_unlock(&svcraw_lock);
			return (NULL);
		}
		if (__rpc_rawcombuf == NULL) {
			__rpc_rawcombuf = calloc(UDPMSGSIZE, sizeof (char));
			if (__rpc_rawcombuf == NULL) {
				free(srp);
				mutex_unlock(&svcraw_lock);
				return (NULL);
			}
		}
		srp->raw_buf = __rpc_rawcombuf; /* Share it with the client */
		srp->server = svc_xprt_alloc();
		if (srp->server == NULL) {
			free(__rpc_rawcombuf);
			free(srp);
			mutex_unlock(&svcraw_lock);
			return (NULL);
		}
		svc_raw_private = srp;
	}
	srp->server->xp_fd = FD_SETSIZE;
	srp->server->xp_port = 0;
	svc_raw_ops(srp->server);
	srp->server->xp_verf.oa_base = srp->verf_body;
	xdrmem_create(&srp->xdr_stream, srp->raw_buf, UDPMSGSIZE, XDR_DECODE);
	xprt_register(srp->server);
	mutex_unlock(&svcraw_lock);
	return (srp->server);
}

/*ARGSUSED*/
static enum xprt_stat
svc_raw_stat(SVCXPRT *xprt)
{
	return (XPRT_IDLE);
}

/*ARGSUSED*/
static bool_t
svc_raw_recv(SVCXPRT *xprt, struct rpc_msg *msg)
{
	struct svc_raw_private *srp;
	XDR *xdrs;

	mutex_lock(&svcraw_lock);
	srp = svc_raw_private;
	if (srp == NULL) {
		mutex_unlock(&svcraw_lock);
		return (FALSE);
	}
	mutex_unlock(&svcraw_lock);

	xdrs = &srp->xdr_stream;
	xdrs->x_op = XDR_DECODE;
	(void) XDR_SETPOS(xdrs, 0);
	if (! xdr_callmsg(xdrs, msg)) {
		return (FALSE);
	}
	return (TRUE);
}

/*ARGSUSED*/
static bool_t
svc_raw_reply(SVCXPRT *xprt, struct rpc_msg *msg)
{
	struct svc_raw_private *srp;
	XDR *xdrs;
	bool_t stat;
	xdrproc_t xdr_proc;
	caddr_t xdr_where;

	mutex_lock(&svcraw_lock);
	srp = svc_raw_private;
	if (srp == NULL) {
		mutex_unlock(&svcraw_lock);
		return (FALSE);
	}
	mutex_unlock(&svcraw_lock);

	xdrs = &srp->xdr_stream;
	xdrs->x_op = XDR_ENCODE;
	(void) XDR_SETPOS(xdrs, 0);
	if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
	    msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
		xdr_proc = msg->acpted_rply.ar_results.proc;
		xdr_where = msg->acpted_rply.ar_results.where;
		msg->acpted_rply.ar_results.proc = (xdrproc_t) xdr_void;
		msg->acpted_rply.ar_results.where = NULL;

		stat = xdr_replymsg(xdrs, msg) &&
		    SVCAUTH_WRAP(&SVC_AUTH(xprt), xdrs, xdr_proc, xdr_where);
	} else {
		stat = xdr_replymsg(xdrs, msg);
	}
	if (!stat) {
		return (FALSE);
	}
	(void) XDR_GETPOS(xdrs);  /* called just for overhead */
	return (TRUE);
}

/*ARGSUSED*/
static bool_t
svc_raw_getargs(SVCXPRT *xprt, xdrproc_t xdr_args, void *args_ptr)
{
	struct svc_raw_private *srp;

	mutex_lock(&svcraw_lock);
	srp = svc_raw_private;
	if (srp == NULL) {
		mutex_unlock(&svcraw_lock);
		return (FALSE);
	}
	mutex_unlock(&svcraw_lock);

	return (SVCAUTH_UNWRAP(&SVC_AUTH(xprt), &srp->xdr_stream,
		xdr_args, args_ptr));
}

/*ARGSUSED*/
static bool_t
svc_raw_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args, void *args_ptr)
{
	struct svc_raw_private *srp;
	XDR *xdrs;

	mutex_lock(&svcraw_lock);
	srp = svc_raw_private;
	if (srp == NULL) {
		mutex_unlock(&svcraw_lock);
		return (FALSE);
	}
	mutex_unlock(&svcraw_lock);

	xdrs = &srp->xdr_stream;
	xdrs->x_op = XDR_FREE;
	return (*xdr_args)(xdrs, args_ptr);
}

/*ARGSUSED*/
static void
svc_raw_destroy(SVCXPRT *xprt)
{
}

/*ARGSUSED*/
static bool_t
svc_raw_control(SVCXPRT *xprt, const u_int rq, void *in)
{
	return (FALSE);
}

static void
svc_raw_ops(SVCXPRT *xprt)
{
	static struct xp_ops ops;
	static struct xp_ops2 ops2;

/* VARIABLES PROTECTED BY ops_lock: ops */

	mutex_lock(&ops_lock);
	if (ops.xp_recv == NULL) {
		ops.xp_recv = svc_raw_recv;
		ops.xp_stat = svc_raw_stat;
		ops.xp_getargs = svc_raw_getargs;
		ops.xp_reply = svc_raw_reply;
		ops.xp_freeargs = svc_raw_freeargs;
		ops.xp_destroy = svc_raw_destroy;
		ops2.xp_control = svc_raw_control;
	}
	xprt->xp_ops = &ops;
	xprt->xp_ops2 = &ops2;
	mutex_unlock(&ops_lock);
}