/* @(#)clnt_raw.c       2.2 88/08/01 4.0 RPCSRC */
/*
 * Copyright (c) 2010, Oracle America, 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 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.
 */
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)clnt_raw.c 1.22 87/08/11 Copyr 1984 Sun Micro";
#endif

/*
 * 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 <gssrpc/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];
        union {
          struct rpc_msg    mashl_rpcmsg;
          char              mashl_callmsg[MCALL_MSG_SIZE];
        } u;
        u_int   mcnt;
} *clntraw_private;

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

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

void    svc_getreq(int);

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

        if (clntraw_private == NULL) {
                clntraw_private = calloc(1, sizeof(*clp));
                if (clntraw_private == NULL)
                        return (NULL);
        }
        clp = clntraw_private;
        xdrs = &clp->xdr_stream;
        client = &clp->client_object;
        /*
         * pre-serialize the staic 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->u.mashl_callmsg, MCALL_MSG_SIZE, XDR_ENCODE);
        if (! xdr_callhdr(xdrs, &call_msg)) {
                perror("clnt_raw.c - 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 = &client_ops;
        client->cl_auth = authnone_create();
        return (client);
}

static enum clnt_stat
clntraw_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;
        long procl = proc;

        if (clp == 0)
                return (RPC_FAILED);
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_PUTLONG(xdrs, &procl)) ||
            (! 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 = gssrpc__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.
                 */
                enum xdr_op op = xdrs->x_op;
                xdrs->x_op = XDR_FREE;
                xdr_replymsg(xdrs, &msg);
                xdrs->x_op = op;
                return (RPC_CANTDECODERES);
        }
        gssrpc__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
clntraw_geterr(
        CLIENT *cl,
        struct rpc_err *err)
{
}


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

        if (clp == 0)
        {
                rval = (bool_t) RPC_FAILED;
                return (rval);
        }
        xdrs->x_op = XDR_FREE;
        return ((*xdr_res)(xdrs, res_ptr));
}

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

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

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