/*      $OpenBSD: clnt_raw.c,v 1.21 2022/02/14 03:38:59 guenther 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.
 */

/*
 * 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 similate rpc and get round trip overhead, without
 * any interference from the kernel.
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <rpc/rpc.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[UDPMSGSIZE];
        char    mashl_callmsg[MCALL_MSG_SIZE];
        u_int   mcnt;
} *clntraw_private;

static enum clnt_stat   clntraw_call(CLIENT *, u_long, xdrproc_t, caddr_t,
                            xdrproc_t, caddr_t, struct timeval);
static void             clntraw_abort(CLIENT *);
static void             clntraw_geterr(CLIENT *, struct rpc_err *);
static bool_t           clntraw_freeres(CLIENT *, xdrproc_t, caddr_t);
static bool_t           clntraw_control(CLIENT *, u_int, void *);
static void             clntraw_destroy(CLIENT *);

static const struct clnt_ops client_ops = {
        clntraw_call,
        clntraw_abort,
        clntraw_geterr,
        clntraw_freeres,
        clntraw_destroy,
        clntraw_control
};

void    svc_getreq(int rdfds);

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

        if (clp == NULL) {
                clp = calloc(1, sizeof (*clp));
                if (clp == NULL)
                        goto fail;
                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;
        call_msg.rm_call.cb_prog = prog;
        call_msg.rm_call.cb_vers = vers;
        xdrmem_create(xdrs, clp->mashl_callmsg, MCALL_MSG_SIZE, XDR_ENCODE); 
        if (!xdr_callhdr(xdrs, &call_msg))
                goto fail;
        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 = &client_ops;
        client->cl_auth = authnone_create();
        if (client->cl_auth == NULL)
                goto fail;
        return (client);

fail:
        mem_free((caddr_t)clntraw_private, sizeof(*clntraw_private));
        clntraw_private = NULL;
        rpc_createerr.cf_stat = RPC_SYSTEMERROR;
        rpc_createerr.cf_error.re_errno = errno;
        return (NULL);
}

static enum clnt_stat 
clntraw_call(CLIENT *h, u_long proc, xdrproc_t xargs, caddr_t argsp,
    xdrproc_t xresults, caddr_t resultsp, struct timeval timeout)
{
        struct clntraw_private *clp = clntraw_private;
        XDR *xdrs;
        struct rpc_msg msg;
        enum clnt_stat status;
        struct rpc_err error;

        if (clp == NULL)
                return (RPC_FAILED);
        xdrs = &clp->xdr_stream;
call_again:
        /*
         * send request
         */
        xdrs->x_op = XDR_ENCODE;
        XDR_SETPOS(xdrs, 0);
        ((struct rpc_msg *)clp->mashl_callmsg)->rm_xid ++ ;
        if ((! XDR_PUTBYTES(xdrs, clp->mashl_callmsg, clp->mcnt)) ||
            (! XDR_PUTLONG(xdrs, (long *)&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(1);

        /*
         * 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)) {
                /* xdr_replymsg() may have left some things allocated */
                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))
                        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);
}

static void
clntraw_geterr(CLIENT *clnt, struct rpc_err *err)
{
}

static bool_t
clntraw_freeres(CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
{
        struct clntraw_private *clp = clntraw_private;
        XDR *xdrs;
        bool_t rval;

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

static void
clntraw_abort(CLIENT *clnt)
{
}

static bool_t
clntraw_control(CLIENT *clnt, u_int i, void *v)
{
        return (FALSE);
}

static void
clntraw_destroy(CLIENT *clnt)
{
}