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
remote_pmap_getport(CLIENT * client,struct pmap * parms,u_short * port)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 *
get_client(struct sockaddr_in * address,int tcp)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
pmap_getport(struct sockaddr_in * address,u_long program,u_long version,u_int protocol)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