NetBSD/lib/libc/rpc/pmap_rmt.c

/*	$NetBSD: pmap_rmt.c,v 1.34 2013/03/11 20:19:29 tron 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.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char *sccsid = "@(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro";
static char *sccsid = "@(#)pmap_rmt.c	2.2 88/08/01 4.0 RPCSRC";
#else
__RCSID("$NetBSD: pmap_rmt.c,v 1.34 2013/03/11 20:19:29 tron Exp $");
#endif
#endif

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

#include "namespace.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>

#ifdef __weak_alias
__weak_alias(xdr_rmtcall_args,_xdr_rmtcall_args)
__weak_alias(xdr_rmtcallres,_xdr_rmtcallres)
#endif

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;
	struct rmtcallargs a;
	struct rmtcallres r;
	enum clnt_stat stat;

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

	addr->sin_port = htons(PMAPPORT);
	client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &sock);
	if (client != NULL) {
		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, (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_t
xdr_rmtcall_args(XDR *xdrs, struct rmtcallargs *cap)
{
	u_int lenposition, argposition, position;

	_DIAGASSERT(xdrs != NULL);
	_DIAGASSERT(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_t
xdr_rmtcallres(XDR *xdrs, struct rmtcallres *crp)
{
	caddr_t port_ptr;

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

	port_ptr = (caddr_t)(void *)crp->port_ptr;
	if (xdr_reference(xdrs, &port_ptr, (u_int)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);
}