/*	$NetBSD: svc_raw.c,v 1.25 2015/11/06 19:32:08 christos Exp $	*/

/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * 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 the "Oracle America, 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" */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)svc_raw.c 1.25 89/01/31 Copyr 1984 Sun Micro";
#else
__RCSID("$NetBSD: svc_raw.c,v 1.25 2015/11/06 19:32:08 christos Exp $");
#endif
#endif

/*
 * 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 <assert.h>
#include <stdlib.h>

#ifdef __weak_alias
__weak_alias(svc_raw_create,_svc_raw_create)
#endif

#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;

#ifdef _REENTRANT
extern mutex_t	svcraw_lock;
#endif

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, caddr_t);
static bool_t svc_raw_freeargs(SVCXPRT *, xdrproc_t, caddr_t);
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 = calloc(1, sizeof(*srp));
		if (srp == NULL)
			goto out;
		if (__rpc_rawcombuf == NULL)
			__rpc_rawcombuf = malloc(UDPMSGSIZE);
		if (__rpc_rawcombuf == NULL)
			goto out;
		srp->raw_buf = __rpc_rawcombuf; /* Share it with the client */
		svc_raw_private = srp;
	}
	srp->server.xp_fd = -1;
	srp->server.xp_port = 0;
	srp->server.xp_p3 = NULL;
	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);
	if (!xprt_register(&srp->server))
		goto out;
	mutex_unlock(&svcraw_lock);
	return (&srp->server);
out:
	if (srp != NULL)
		free(srp);
	mutex_unlock(&svcraw_lock);
	return (NULL);
}

/*ARGSUSED*/
static enum xprt_stat
svc_raw_stat(SVCXPRT *xprt) /* args needed to satisfy ANSI-C typechecking */
{
	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;

	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 (! xdr_replymsg(xdrs, msg)) {
		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, caddr_t 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 (*xdr_args)(&srp->xdr_stream, args_ptr);
}

/*ARGSUSED*/
static bool_t
svc_raw_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t 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;
#ifdef _REENTRANT
	extern mutex_t ops_lock;
#endif

	_DIAGASSERT(xprt != NULL);

/* 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);
}