/*      $NetBSD: clnt_raw.c,v 1.20 2000/12/10 04:12:03 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.
 */

/*
 * clnt_raw.c
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 *
 * Memory based rpc for simple testing and timing.
 * Interface to create an rpc client and server in the same process.
 * This lets us similate rpc and get round trip overhead, without
 * any interference from the kernel.
 */

#include "namespace.h"
#include "reentrant.h"
#include <assert.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>

#include <rpc/rpc.h>
#include <rpc/raw.h>
#include "un-namespace.h"
#include "mt_misc.h"

#define MCALL_MSG_SIZE 24

/*
 * This is the "network" we will be moving stuff over.
 */
static struct clntraw_private {
        CLIENT  client_object;
        XDR     xdr_stream;
        char    *_raw_buf;
        union {
            struct rpc_msg      mashl_rpcmsg;
            char                mashl_callmsg[MCALL_MSG_SIZE];
        } u;
        u_int   mcnt;
} *clntraw_private;

static enum clnt_stat clnt_raw_call(CLIENT *, rpcproc_t, xdrproc_t, void *,
        xdrproc_t, void *, struct timeval);
static void clnt_raw_geterr(CLIENT *, struct rpc_err *);
static bool_t clnt_raw_freeres(CLIENT *, xdrproc_t, void *);
static void clnt_raw_abort(CLIENT *);
static bool_t clnt_raw_control(CLIENT *, u_int, void *);
static void clnt_raw_destroy(CLIENT *);
static struct clnt_ops *clnt_raw_ops(void);

/*
 * Create a client handle for memory based rpc.
 */
CLIENT *
clnt_raw_create(rpcprog_t prog, rpcvers_t vers)
{
        struct clntraw_private *clp;
        struct rpc_msg call_msg;
        XDR *xdrs;
        CLIENT  *client;

        mutex_lock(&clntraw_lock);
        if ((clp = clntraw_private) == NULL) {
                clp = (struct clntraw_private *)calloc(1, sizeof (*clp));
                if (clp == NULL) {
                        mutex_unlock(&clntraw_lock);
                        return NULL;
                }
                if (__rpc_rawcombuf == NULL)
                        __rpc_rawcombuf =
                            (char *)calloc(UDPMSGSIZE, sizeof (char));
                clp->_raw_buf = __rpc_rawcombuf;
                clntraw_private = clp;
        }
        xdrs = &clp->xdr_stream;
        client = &clp->client_object;

        /*
         * pre-serialize the static part of the call msg and stash it away
         */
        call_msg.rm_direction = CALL;
        call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
        /* XXX: prog and vers have been long historically :-( */
        call_msg.rm_call.cb_prog = (u_int32_t)prog;
        call_msg.rm_call.cb_vers = (u_int32_t)vers;
        xdrmem_create(xdrs, clp->u.mashl_callmsg, MCALL_MSG_SIZE, XDR_ENCODE); 
        if (! xdr_callhdr(xdrs, &call_msg))
                warnx("clntraw_create - Fatal header serialization error.");
        clp->mcnt = XDR_GETPOS(xdrs);
        XDR_DESTROY(xdrs);

        /*
         * Set xdrmem for client/server shared buffer
         */
        xdrmem_create(xdrs, clp->_raw_buf, UDPMSGSIZE, XDR_FREE);

        /*
         * create client handle
         */
        client->cl_ops = clnt_raw_ops();
        client->cl_auth = authnone_create();
        mutex_unlock(&clntraw_lock);
        return (client);
}

/* ARGSUSED */
static enum clnt_stat 
clnt_raw_call(CLIENT *h, rpcproc_t proc, xdrproc_t xargs, void *argsp,
    xdrproc_t xresults, void *resultsp, struct timeval timeout)
{
        struct clntraw_private *clp = clntraw_private;
        XDR *xdrs = &clp->xdr_stream;
        struct rpc_msg msg;
        enum clnt_stat status;
        struct rpc_err error;

        assert(h != NULL);

        mutex_lock(&clntraw_lock);
        if (clp == NULL) {
                mutex_unlock(&clntraw_lock);
                return (RPC_FAILED);
        }
        mutex_unlock(&clntraw_lock);

call_again:
        /*
         * send request
         */
        xdrs->x_op = XDR_ENCODE;
        XDR_SETPOS(xdrs, 0);
        clp->u.mashl_rpcmsg.rm_xid ++ ;
        if ((! XDR_PUTBYTES(xdrs, clp->u.mashl_callmsg, clp->mcnt)) ||
            (! XDR_PUTINT32(xdrs, &proc)) ||
            (! AUTH_MARSHALL(h->cl_auth, xdrs)) ||
            (! (*xargs)(xdrs, argsp))) {
                return (RPC_CANTENCODEARGS);
        }
        (void)XDR_GETPOS(xdrs);  /* called just to cause overhead */

        /*
         * We have to call server input routine here because this is
         * all going on in one process. Yuk.
         */
        svc_getreq_common(FD_SETSIZE);

        /*
         * get results
         */
        xdrs->x_op = XDR_DECODE;
        XDR_SETPOS(xdrs, 0);
        msg.acpted_rply.ar_verf = _null_auth;
        msg.acpted_rply.ar_results.where = resultsp;
        msg.acpted_rply.ar_results.proc = xresults;
        if (! xdr_replymsg(xdrs, &msg)) {
                /*
                 * It's possible for xdr_replymsg() to fail partway
                 * through its attempt to decode the result from the
                 * server. If this happens, it will leave the reply
                 * structure partially populated with dynamically
                 * allocated memory. (This can happen if someone uses
                 * clntudp_bufcreate() to create a CLIENT handle and
                 * specifies a receive buffer size that is too small.)
                 * This memory must be free()ed to avoid a leak.
                 */
                int op = xdrs->x_op;
                xdrs->x_op = XDR_FREE;
                xdr_replymsg(xdrs, &msg);
                xdrs->x_op = op;
                return (RPC_CANTDECODERES);
        }
        _seterr_reply(&msg, &error);
        status = error.re_status;

        if (status == RPC_SUCCESS) {
                if (! AUTH_VALIDATE(h->cl_auth, &msg.acpted_rply.ar_verf)) {
                        status = RPC_AUTHERROR;
                }
        }  /* end successful completion */
        else {
                if (AUTH_REFRESH(h->cl_auth, &msg))
                        goto call_again;
        }  /* end of unsuccessful completion */

        if (status == RPC_SUCCESS) {
                if (! AUTH_VALIDATE(h->cl_auth, &msg.acpted_rply.ar_verf)) {
                        status = RPC_AUTHERROR;
                }
                if (msg.acpted_rply.ar_verf.oa_base != NULL) {
                        xdrs->x_op = XDR_FREE;
                        (void)xdr_opaque_auth(xdrs, &(msg.acpted_rply.ar_verf));
                }
        }

        return (status);
}

/*ARGSUSED*/
static void
clnt_raw_geterr(CLIENT *cl, struct rpc_err *err)
{
}


/* ARGSUSED */
static bool_t
clnt_raw_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
{
        struct clntraw_private *clp = clntraw_private;
        XDR *xdrs = &clp->xdr_stream;
        bool_t rval;

        mutex_lock(&clntraw_lock);
        if (clp == NULL) {
                rval = (bool_t) RPC_FAILED;
                mutex_unlock(&clntraw_lock);
                return (rval);
        }
        mutex_unlock(&clntraw_lock);
        xdrs->x_op = XDR_FREE;
        return ((*xdr_res)(xdrs, res_ptr));
}

/*ARGSUSED*/
static void
clnt_raw_abort(CLIENT *cl)
{
}

/*ARGSUSED*/
static bool_t
clnt_raw_control(CLIENT *cl, u_int ui, void *str)
{
        return (FALSE);
}

/*ARGSUSED*/
static void
clnt_raw_destroy(CLIENT *cl)
{
}

static struct clnt_ops *
clnt_raw_ops(void)
{
        static struct clnt_ops ops;

        /* VARIABLES PROTECTED BY ops_lock: ops */

        mutex_lock(&ops_lock);
        if (ops.cl_call == NULL) {
                ops.cl_call = clnt_raw_call;
                ops.cl_abort = clnt_raw_abort;
                ops.cl_geterr = clnt_raw_geterr;
                ops.cl_freeres = clnt_raw_freeres;
                ops.cl_destroy = clnt_raw_destroy;
                ops.cl_control = clnt_raw_control;
        }
        mutex_unlock(&ops_lock);
        return (&ops);
}