/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
 * Portions of this source code were derived from Berkeley
 * 4.3 BSD under license from the Regents of the University of
 * California.
 */

/*
 * clnt_raw.c
 *
 * Memory based rpc for simple testing and timing.
 * Interface to create an rpc client and server in the same process.
 * This lets us simulate rpc and get round trip overhead, without
 * any interference from the kernel.
 */
#include "mt.h"
#include "rpc_mt.h"
#include <stdlib.h>
#include <rpc/rpc.h>
#include <syslog.h>

extern mutex_t  clntraw_lock;
#define MCALL_MSG_SIZE 24

/*
 * This is the "network" we will be moving stuff over.
 */
static struct clnt_raw_private {
        CLIENT  client_object;
        struct netbuf   *raw_netbuf;
        char    mashl_callmsg[MCALL_MSG_SIZE];
        uint_t  mcnt;
} *clnt_raw_private;

static struct clnt_ops *clnt_raw_ops();

extern bool_t xdr_opaque_auth();

/*
 * This netbuf is shared with the raw server.
 */
extern struct netbuf _rawcomnetbuf;

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

/* VARIABLES PROTECTED BY clntraw_lock: clp */

        (void) mutex_lock(&clntraw_lock);
        clp = clnt_raw_private;
        if (clp != NULL) {
                (void) mutex_unlock(&clntraw_lock);
                return (&clp->client_object);
        }

        clp = calloc(1, sizeof (*clp));
        if (clp == NULL) {
                (void) mutex_unlock(&clntraw_lock);
                return (NULL);
        }

        clp->raw_netbuf = &_rawcomnetbuf;

        /*
         * 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;
        call_msg.rm_call.cb_prog = prog;
        call_msg.rm_call.cb_vers = vers;

        xdrmem_create(&xdrs, clp->mashl_callmsg, sizeof (clp->mashl_callmsg),
            XDR_ENCODE);
        start = XDR_GETPOS(&xdrs);
        if (!xdr_callhdr(&xdrs, &call_msg)) {
                free(clp);
                (void) syslog(LOG_ERR,
                    "clnt_raw_create: Fatal header serialization error");

                (void) mutex_unlock(&clntraw_lock);
                return (NULL);
        }
        clp->mcnt = XDR_GETPOS(&xdrs) - start;
        XDR_DESTROY(&xdrs);

        /*
         * create client handle
         */
        client = &clp->client_object;
        client->cl_ops = clnt_raw_ops();
        client->cl_auth = authnone_create();

        clnt_raw_private = clp;

        (void) mutex_unlock(&clntraw_lock);
        return (client);
}

/*ARGSUSED*/
static enum clnt_stat
clnt_raw_call(CLIENT *h, rpcproc_t proc, xdrproc_t xargs, caddr_t argsp,
    xdrproc_t xresults, caddr_t resultsp, struct timeval timeout)
{
        struct clnt_raw_private *clp;
        XDR xdrs;
        struct rpc_msg msg;
        uint_t start;

        rpc_callerr.re_errno = 0;
        rpc_callerr.re_terrno = 0;

        (void) mutex_lock(&clntraw_lock);
        clp = clnt_raw_private;
        if (clp == NULL) {
                (void) mutex_unlock(&clntraw_lock);
                return (rpc_callerr.re_status = RPC_FAILED);
        }
        (void) mutex_unlock(&clntraw_lock);

call_again:
        /*
         * send request
         */
        xdrmem_create(&xdrs, clp->raw_netbuf->buf, clp->raw_netbuf->maxlen,
            XDR_ENCODE);
        start = XDR_GETPOS(&xdrs);
/* LINTED pointer alignment */
        ((struct rpc_msg *)clp->mashl_callmsg)->rm_xid++;
        if ((!XDR_PUTBYTES(&xdrs, clp->mashl_callmsg, clp->mcnt)) ||
            (!XDR_PUTINT32(&xdrs, (int32_t *)&proc)) ||
            (!AUTH_MARSHALL(h->cl_auth, &xdrs)) ||
            (!(*xargs)(&xdrs, argsp))) {
                XDR_DESTROY(&xdrs);
                return (rpc_callerr.re_status = RPC_CANTENCODEARGS);
        }
        clp->raw_netbuf->len = XDR_GETPOS(&xdrs) - start;
        XDR_DESTROY(&xdrs);

        /*
         * We have to call server input routine here because this is
         * all going on in one process.
         * By convention using FD_SETSIZE as the pseudo file descriptor.
         */
        svc_getreq_common(FD_SETSIZE);

        /*
         * get results
         */
        xdrmem_create(&xdrs, clp->raw_netbuf->buf, clp->raw_netbuf->len,
            XDR_DECODE);
        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)) {
                XDR_DESTROY(&xdrs);
                return (rpc_callerr.re_status = RPC_CANTDECODERES);
        }
        XDR_DESTROY(&xdrs);
        if ((msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
            (msg.acpted_rply.ar_stat == SUCCESS))
                rpc_callerr.re_status = RPC_SUCCESS;
        else
                __seterr_reply(&msg, &rpc_callerr);

        if (rpc_callerr.re_status == RPC_SUCCESS) {
                if (!AUTH_VALIDATE(h->cl_auth, &msg.acpted_rply.ar_verf)) {
                        rpc_callerr.re_status = RPC_AUTHERROR;
                        rpc_callerr.re_why = AUTH_INVALIDRESP;
                }
                if (msg.acpted_rply.ar_verf.oa_base != NULL) {
                        xdr_free(xdr_opaque_auth,
                            (char *)&(msg.acpted_rply.ar_verf));
                }
                /* end successful completion */
        } else {
                if (AUTH_REFRESH(h->cl_auth, &msg))
                        goto call_again;
                /* end of unsuccessful completion */
        }

        return (rpc_callerr.re_status);
}

/*ARGSUSED*/
static enum clnt_stat
clnt_raw_send(CLIENT *h, rpcproc_t proc, xdrproc_t xargs, caddr_t argsp)
{
        struct clnt_raw_private *clp;
        XDR xdrs;
        uint_t start;

        rpc_callerr.re_errno = 0;
        rpc_callerr.re_terrno = 0;

        (void) mutex_lock(&clntraw_lock);
        clp = clnt_raw_private;
        if (clp == NULL) {
                (void) mutex_unlock(&clntraw_lock);
                return (rpc_callerr.re_status = RPC_FAILED);
        }
        (void) mutex_unlock(&clntraw_lock);

        /*
         * send request
         */
        xdrmem_create(&xdrs, clp->raw_netbuf->buf, clp->raw_netbuf->maxlen,
            XDR_ENCODE);
        start = XDR_GETPOS(&xdrs);
/* LINTED pointer alignment */
        ((struct rpc_msg *)clp->mashl_callmsg)->rm_xid++;
        if ((!XDR_PUTBYTES(&xdrs, clp->mashl_callmsg, clp->mcnt)) ||
            (!XDR_PUTINT32(&xdrs, (int32_t *)&proc)) ||
            (!AUTH_MARSHALL(h->cl_auth, &xdrs)) ||
            (!(*xargs)(&xdrs, argsp))) {
                XDR_DESTROY(&xdrs);
                return (rpc_callerr.re_status = RPC_CANTENCODEARGS);
        }
        clp->raw_netbuf->len = XDR_GETPOS(&xdrs) - start;
        XDR_DESTROY(&xdrs);

        /*
         * We have to call server input routine here because this is
         * all going on in one process.
         * By convention using FD_SETSIZE as the pseudo file descriptor.
         */
        svc_getreq_common(FD_SETSIZE);

        return (rpc_callerr.re_status = RPC_SUCCESS);
}

/*ARGSUSED*/
static void
clnt_raw_geterr(CLIENT *cl, struct rpc_err *errp)
{
        *errp = rpc_callerr;
}

/*ARGSUSED*/
static bool_t
clnt_raw_freeres(CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
{
        struct clnt_raw_private *clp;

        (void) mutex_lock(&clntraw_lock);
        clp = clnt_raw_private;
        if (clp == NULL) {
                (void) mutex_unlock(&clntraw_lock);
                return (FALSE);
        }
        (void) mutex_unlock(&clntraw_lock);

        xdr_free(xdr_res, res_ptr);

        return (TRUE);
}

/*ARGSUSED*/
static void
clnt_raw_abort(CLIENT *cl, struct rpc_err *errp)
{
}

/*ARGSUSED*/
static bool_t
clnt_raw_control(CLIENT *cl, int request, char *info)
{
        return (FALSE);
}

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

static struct clnt_ops *
clnt_raw_ops(void)
{
        static struct clnt_ops ops;
        extern mutex_t  ops_lock;

        /* VARIABLES PROTECTED BY ops_lock: ops */

        (void) mutex_lock(&ops_lock);
        if (ops.cl_call == NULL) {
                ops.cl_call = clnt_raw_call;
                ops.cl_send = clnt_raw_send;
                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;
        }
        (void) mutex_unlock(&ops_lock);
        return (&ops);
}