src/pmap_rmt.c

/*
 * 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.
 */

/*
 * pmap_rmt.c
 * Client interface to pmap rpc service.
 * remote call and broadcast service
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 */

#include <config.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/socket.h>

#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <assert.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_rmt.h>

/* For the clnttcp_create function
 * #include <clnt_soc.h> */

static const struct timeval timeout = { 3, 0 };

/*
 * pmapper remote-call-service interface.
 * This routine is used to call the pmapper remote call service
 * which will look up a service program in the port maps, and then
 * remotely call that routine with the given parameters.  This allows
 * programs to do a lookup and call in one step.
 */
enum clnt_stat
pmap_rmtcall(struct sockaddr_in *addr, u_long prog, u_long vers,
	     u_long proc, xdrproc_t xdrargs, caddr_t argsp,
	     xdrproc_t xdrres, caddr_t resp, struct timeval tout,
	     u_long *port_ptr)
{
	int sock = -1;
	CLIENT *client;
	AUTH *auth;
	struct rmtcallargs a;
	struct rmtcallres r;
	enum clnt_stat stat;

	assert(addr != NULL);
	assert(port_ptr != NULL);

	addr->sin_port = htons(PMAPPORT);
	client = clntudp_ncreate(addr, PMAPPROG, PMAPVERS, timeout, &sock);
	if (client != NULL) {
		auth = authnone_create();
		a.prog = prog;
		a.vers = vers;
		a.proc = proc;
		a.args_ptr = argsp;
		a.xdr_args = xdrargs;
		r.port_ptr = port_ptr;
		r.results_ptr = resp;
		r.xdr_results = xdrres;
		stat =
		    CLNT_CALL(client, auth, (rpcproc_t) PMAPPROC_CALLIT,
			      (xdrproc_t) xdr_rmtcall_args, &a,
			      (xdrproc_t) xdr_rmtcallres, &r, tout);
		CLNT_DESTROY(client);
	} else {
		stat = RPC_FAILED;
	}
	addr->sin_port = 0;
	return (stat);
}

/*
 * XDR remote call arguments
 * written for XDR_ENCODE direction only
 */
bool
xdr_rmtcall_args(XDR *xdrs, struct rmtcallargs *cap)
{
	u_int lenposition, argposition, position;

	assert(xdrs != NULL);
	assert(cap != NULL);

	if (xdr_u_long(xdrs, &(cap->prog)) && xdr_u_long(xdrs, &(cap->vers))
	    && xdr_u_long(xdrs, &(cap->proc))) {
		lenposition = XDR_GETPOS(xdrs);
		if (!xdr_u_long(xdrs, &(cap->arglen)))
			return (false);
		argposition = XDR_GETPOS(xdrs);
		if (!(*(cap->xdr_args)) (xdrs, cap->args_ptr))
			return (false);
		position = XDR_GETPOS(xdrs);
		cap->arglen = (u_long) position - (u_long) argposition;
		XDR_SETPOS(xdrs, lenposition);
		if (!xdr_u_long(xdrs, &(cap->arglen)))
			return (false);
		XDR_SETPOS(xdrs, position);
		return (true);
	}
	return (false);
}

/*
 * XDR remote call results
 * written for XDR_DECODE direction only
 */
bool
xdr_rmtcallres(XDR *xdrs, struct rmtcallres *crp)
{
	caddr_t port_ptr;

	assert(xdrs != NULL);
	assert(crp != NULL);

	port_ptr = (caddr_t) (void *)crp->port_ptr;
	if (xdr_reference
	    (xdrs, &port_ptr, sizeof(u_long), (xdrproc_t) xdr_u_long)
	    && xdr_u_long(xdrs, &crp->resultslen)) {
		crp->port_ptr = (u_long *) (void *)port_ptr;
		return ((*(crp->xdr_results)) (xdrs, crp->results_ptr));
	}
	return (false);
}