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pmap_getport.c revision 1.18 
      1 /*	$NetBSD: pmap_getport.c,v 1.18 2008/01/28 01:10:22 christos Exp $	*/
      2 
      3 /*
      4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
      5  * unrestricted use provided that this legend is included on all tape
      6  * media and as a part of the software program in whole or part.  Users
      7  * may copy or modify Sun RPC without charge, but are not authorized
      8  * to license or distribute it to anyone else except as part of a product or
      9  * program developed by the user.
     10  *
     11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
     12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
     13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
     14  *
     15  * Sun RPC is provided with no support and without any obligation on the
     16  * part of Sun Microsystems, Inc. to assist in its use, correction,
     17  * modification or enhancement.
     18  *
     19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
     20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
     21  * OR ANY PART THEREOF.
     22  *
     23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
     24  * or profits or other special, indirect and consequential damages, even if
     25  * Sun has been advised of the possibility of such damages.
     26  *
     27  * Sun Microsystems, Inc.
     28  * 2550 Garcia Avenue
     29  * Mountain View, California  94043
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char *sccsid = "@(#)pmap_getport.c 1.9 87/08/11 Copyr 1984 Sun Micro";
     36 static char *sccsid = "@(#)pmap_getport.c	2.2 88/08/01 4.0 RPCSRC";
     37 #else
     38 __RCSID("$NetBSD: pmap_getport.c,v 1.18 2008/01/28 01:10:22 christos Exp $");
     39 #endif
     40 #endif
     41 
     42 /*
     43  * pmap_getport.c
     44  * Client interface to pmap rpc service.
     45  *
     46  * Copyright (C) 1984, Sun Microsystems, Inc.
     47  */
     48 
     49 #include "namespace.h"
     50 
     51 #include <sys/types.h>
     52 #include <sys/socket.h>
     53 
     54 #include <net/if.h>
     55 
     56 #include <assert.h>
     57 #include <unistd.h>
     58 
     59 #include <rpc/rpc.h>
     60 #include <rpc/pmap_prot.h>
     61 #include <rpc/pmap_clnt.h>
     62 
     63 #ifdef __weak_alias
     64 __weak_alias(pmap_getport,_pmap_getport)
     65 #endif
     66 
     67 static const struct timeval timeout = { 5, 0 };
     68 static const struct timeval tottimeout = { 60, 0 };
     69 
     70 /*
     71  * Find the mapped port for program,version.
     72  * Calls the pmap service remotely to do the lookup.
     73  * Returns 0 if no map exists.
     74  */
     75 
     76 static void
     77 remote_pmap_getport(CLIENT *client, struct pmap *parms, u_short *port)
     78 {
     79 	if (CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT, (xdrproc_t)xdr_pmap,
     80 	    parms, (xdrproc_t)xdr_u_short, port, tottimeout) != RPC_SUCCESS) {
     81 		rpc_createerr.cf_stat = RPC_PMAPFAILURE;
     82 		clnt_geterr(client, &rpc_createerr.cf_error);
     83 	} else if (*port == 0) {
     84 		rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
     85 		clnt_geterr(client, &rpc_createerr.cf_error);
     86 	}
     87 	CLNT_DESTROY(client);
     88 }
     89 
     90 static CLIENT *
     91 get_client(struct sockaddr_in *address, int tcp)
     92 {
     93 	int sock = -1;
     94 	if (tcp)
     95 		return clnttcp_create(address, PMAPPROG, PMAPVERS, &sock, 0, 0);
     96 	else
     97 		return clntudp_bufcreate(address, PMAPPROG, PMAPVERS, timeout,
     98 		    &sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
     99 }
    100 
    101 u_short
    102 pmap_getport(struct sockaddr_in *address, u_long program, u_long version,
    103     u_int protocol)
    104 {
    105 	u_short port = 0;
    106 	CLIENT *client;
    107 	struct pmap parms;
    108 
    109 	_DIAGASSERT(address != NULL);
    110 
    111 	parms.pm_prog = program;
    112 	parms.pm_vers = version;
    113 	parms.pm_prot = protocol;
    114 	parms.pm_port = 0;  /* not needed or used */
    115 
    116 	address->sin_port = htons(PMAPPORT);
    117 
    118 	client = get_client(address, protocol == IPPROTO_TCP);
    119 	if (client != NULL)
    120 		remote_pmap_getport(client, &parms, &port);
    121 
    122 	if (port == 0) {
    123 		client = get_client(address, protocol != IPPROTO_TCP);
    124 		if (client != NULL)
    125 			remote_pmap_getport(client, &parms, &port);
    126 	}
    127 
    128 	address->sin_port = 0;
    129 	return port;
    130 }
    131