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      1 /*	$NetBSD: pmap_getport.c,v 1.19 2013/03/11 20:19:29 tron Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2010, Oracle America, Inc.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions are
      8  * met:
      9  *
     10  *     * Redistributions of source code must retain the above copyright
     11  *       notice, this list of conditions and the following disclaimer.
     12  *     * Redistributions in binary form must reproduce the above
     13  *       copyright notice, this list of conditions and the following
     14  *       disclaimer in the documentation and/or other materials
     15  *       provided with the distribution.
     16  *     * Neither the name of the "Oracle America, Inc." nor the names of its
     17  *       contributors may be used to endorse or promote products derived
     18  *       from this software without specific prior written permission.
     19  *
     20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     23  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     24  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     25  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
     27  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     28  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     29  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     30  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 #if defined(LIBC_SCCS) && !defined(lint)
     36 #if 0
     37 static char *sccsid = "@(#)pmap_getport.c 1.9 87/08/11 Copyr 1984 Sun Micro";
     38 static char *sccsid = "@(#)pmap_getport.c	2.2 88/08/01 4.0 RPCSRC";
     39 #else
     40 __RCSID("$NetBSD: pmap_getport.c,v 1.19 2013/03/11 20:19:29 tron Exp $");
     41 #endif
     42 #endif
     43 
     44 /*
     45  * pmap_getport.c
     46  * Client interface to pmap rpc service.
     47  *
     48  * Copyright (C) 1984, Sun Microsystems, Inc.
     49  */
     50 
     51 #include "namespace.h"
     52 
     53 #include <sys/types.h>
     54 #include <sys/socket.h>
     55 
     56 #include <net/if.h>
     57 
     58 #include <assert.h>
     59 #include <unistd.h>
     60 
     61 #include <rpc/rpc.h>
     62 #include <rpc/pmap_prot.h>
     63 #include <rpc/pmap_clnt.h>
     64 
     65 #ifdef __weak_alias
     66 __weak_alias(pmap_getport,_pmap_getport)
     67 #endif
     68 
     69 static const struct timeval timeout = { 5, 0 };
     70 static const struct timeval tottimeout = { 60, 0 };
     71 
     72 /*
     73  * Find the mapped port for program,version.
     74  * Calls the pmap service remotely to do the lookup.
     75  * Returns 0 if no map exists.
     76  */
     77 
     78 static void
     79 remote_pmap_getport(CLIENT *client, struct pmap *parms, u_short *port)
     80 {
     81 	if (CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT, (xdrproc_t)xdr_pmap,
     82 	    parms, (xdrproc_t)xdr_u_short, port, tottimeout) != RPC_SUCCESS) {
     83 		rpc_createerr.cf_stat = RPC_PMAPFAILURE;
     84 		clnt_geterr(client, &rpc_createerr.cf_error);
     85 	} else if (*port == 0) {
     86 		rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
     87 		clnt_geterr(client, &rpc_createerr.cf_error);
     88 	}
     89 	CLNT_DESTROY(client);
     90 }
     91 
     92 static CLIENT *
     93 get_client(struct sockaddr_in *address, int tcp)
     94 {
     95 	int sock = -1;
     96 	if (tcp)
     97 		return clnttcp_create(address, PMAPPROG, PMAPVERS, &sock, 0, 0);
     98 	else
     99 		return clntudp_bufcreate(address, PMAPPROG, PMAPVERS, timeout,
    100 		    &sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
    101 }
    102 
    103 u_short
    104 pmap_getport(struct sockaddr_in *address, u_long program, u_long version,
    105     u_int protocol)
    106 {
    107 	u_short port = 0;
    108 	CLIENT *client;
    109 	struct pmap parms;
    110 
    111 	_DIAGASSERT(address != NULL);
    112 
    113 	parms.pm_prog = program;
    114 	parms.pm_vers = version;
    115 	parms.pm_prot = protocol;
    116 	parms.pm_port = 0;  /* not needed or used */
    117 
    118 	address->sin_port = htons(PMAPPORT);
    119 
    120 	client = get_client(address, protocol == IPPROTO_TCP);
    121 	if (client != NULL)
    122 		remote_pmap_getport(client, &parms, &port);
    123 
    124 	if (port == 0) {
    125 		client = get_client(address, protocol != IPPROTO_TCP);
    126 		if (client != NULL)
    127 			remote_pmap_getport(client, &parms, &port);
    128 	}
    129 
    130 	address->sin_port = 0;
    131 	return port;
    132 }
    133