/*      $OpenBSD: pmap_getport.c,v 1.13 2015/09/13 15:36:56 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
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 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * pmap_getport.c
 * Client interface to pmap rpc service.
 */

#include <unistd.h>
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#include <rpc/pmap_clnt.h>
#include <sys/socket.h>
#include <net/if.h>

static struct timeval timeout = { 5, 0 };
static struct timeval tottimeout = { 60, 0 };

/*
 * Find the mapped port for program,version.
 * Calls the pmap service remotely to do the lookup.
 * Returns 0 if no map exists.
 */
u_short
pmap_getport(struct sockaddr_in *address, u_long program, u_long version,
    u_int protocol)
{
        u_short port = 0;
        int sock = -1;
        CLIENT *client;
        struct pmap parms;

        address->sin_port = htons(PMAPPORT);
        client = clntudp_bufcreate(address, PMAPPROG,
            PMAPVERS, timeout, &sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
        if (client != NULL) {
                parms.pm_prog = program;
                parms.pm_vers = version;
                parms.pm_prot = protocol;
                parms.pm_port = 0;  /* not needed or used */
                if (CLNT_CALL(client, PMAPPROC_GETPORT, xdr_pmap, &parms,
                    xdr_u_short, &port, tottimeout) != RPC_SUCCESS){
                        rpc_createerr.cf_stat = RPC_PMAPFAILURE;
                        clnt_geterr(client, &rpc_createerr.cf_error);
                } else if (port == 0) {
                        rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
                }
                CLNT_DESTROY(client);
        }
        address->sin_port = 0;
        return (port);
}
DEF_WEAK(pmap_getport);