lib/libc/rpc/pmap_getport.c

   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 }