1 | /* |
2 | * pmap_getport.c |
3 | * Client interface to pmap rpc service. |
4 | * |
5 | * Copyright (c) 2010, Oracle America, Inc. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions are |
9 | * met: |
10 | * |
11 | * * Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. |
13 | * * Redistributions in binary form must reproduce the above |
14 | * copyright notice, this list of conditions and the following |
15 | * disclaimer in the documentation and/or other materials |
16 | * provided with the distribution. |
17 | * * Neither the name of the "Oracle America, Inc." nor the names of its |
18 | * contributors may be used to endorse or promote products derived |
19 | * from this software without specific prior written permission. |
20 | * |
21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
22 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
24 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
25 | * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
26 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
28 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
30 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
31 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
32 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
33 | */ |
34 | |
35 | #include <stdbool.h> |
36 | #include <unistd.h> |
37 | #include <rpc/rpc.h> |
38 | #include <rpc/pmap_prot.h> |
39 | #include <rpc/pmap_clnt.h> |
40 | #include <sys/socket.h> |
41 | |
42 | /* |
43 | * Create a socket that is locally bound to a non-reserve port. For |
44 | * any failures, -1 is returned which will cause the RPC code to |
45 | * create the socket. |
46 | */ |
47 | int |
48 | internal_function |
49 | __get_socket (struct sockaddr_in *saddr) |
50 | { |
51 | int so = __socket (AF_INET, SOCK_STREAM, IPPROTO_TCP); |
52 | if (so < 0) |
53 | return -1; |
54 | |
55 | struct sockaddr_in laddr; |
56 | socklen_t namelen = sizeof (laddr); |
57 | laddr.sin_family = AF_INET; |
58 | laddr.sin_port = 0; |
59 | laddr.sin_addr.s_addr = htonl (INADDR_ANY); |
60 | |
61 | int cc = __bind (so, (struct sockaddr *) &laddr, namelen); |
62 | if (__glibc_unlikely (cc < 0)) |
63 | { |
64 | fail: |
65 | __close (so); |
66 | return -1; |
67 | } |
68 | |
69 | cc = __connect (so, (struct sockaddr *) saddr, namelen); |
70 | if (__glibc_unlikely (cc < 0)) |
71 | goto fail; |
72 | |
73 | return so; |
74 | } |
75 | |
76 | |
77 | /* |
78 | * Find the mapped port for program,version. |
79 | * Internal version with additional parameters. |
80 | * Calls the pmap service remotely to do the lookup. |
81 | * Returns 0 if no map exists. |
82 | */ |
83 | u_short |
84 | internal_function |
85 | __libc_rpc_getport (struct sockaddr_in *address, u_long program, |
86 | u_long version, u_int protocol, time_t timeout_sec, |
87 | time_t tottimeout_sec) |
88 | { |
89 | const struct timeval timeout = {timeout_sec, 0}; |
90 | const struct timeval tottimeout = {tottimeout_sec, 0}; |
91 | |
92 | u_short port = 0; |
93 | int socket = -1; |
94 | CLIENT *client; |
95 | struct pmap parms; |
96 | bool closeit = false; |
97 | |
98 | address->sin_port = htons (PMAPPORT); |
99 | if (protocol == IPPROTO_TCP) |
100 | { |
101 | /* Don't need a reserved port to get ports from the portmapper. */ |
102 | socket = __get_socket(address); |
103 | if (socket != -1) |
104 | closeit = true; |
105 | client = clnttcp_create (address, PMAPPROG, PMAPVERS, &socket, |
106 | RPCSMALLMSGSIZE, RPCSMALLMSGSIZE); |
107 | } |
108 | else |
109 | client = clntudp_bufcreate (address, PMAPPROG, PMAPVERS, timeout, |
110 | &socket, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE); |
111 | if (client != (CLIENT *) NULL) |
112 | { |
113 | struct rpc_createerr *ce = &get_rpc_createerr (); |
114 | parms.pm_prog = program; |
115 | parms.pm_vers = version; |
116 | parms.pm_prot = protocol; |
117 | parms.pm_port = 0; /* not needed or used */ |
118 | if (CLNT_CALL (client, PMAPPROC_GETPORT, (xdrproc_t)xdr_pmap, |
119 | (caddr_t)&parms, (xdrproc_t)xdr_u_short, |
120 | (caddr_t)&port, tottimeout) != RPC_SUCCESS) |
121 | { |
122 | ce->cf_stat = RPC_PMAPFAILURE; |
123 | clnt_geterr (client, &ce->cf_error); |
124 | } |
125 | else if (port == 0) |
126 | { |
127 | ce->cf_stat = RPC_PROGNOTREGISTERED; |
128 | } |
129 | CLNT_DESTROY (client); |
130 | } |
131 | /* We only need to close the socket here if we opened it. */ |
132 | if (closeit) |
133 | (void) __close (socket); |
134 | address->sin_port = 0; |
135 | return port; |
136 | } |
137 | #ifdef EXPORT_RPC_SYMBOLS |
138 | libc_hidden_def (__libc_rpc_getport) |
139 | #else |
140 | libc_hidden_nolink_sunrpc (__libc_rpc_getport, GLIBC_PRIVATE) |
141 | #endif |
142 | |
143 | |
144 | /* |
145 | * Find the mapped port for program,version. |
146 | * Calls the pmap service remotely to do the lookup. |
147 | * Returns 0 if no map exists. |
148 | */ |
149 | u_short |
150 | pmap_getport (struct sockaddr_in *address, u_long program, u_long version, |
151 | u_int protocol) |
152 | { |
153 | return __libc_rpc_getport (address, program, version, protocol, 5, 60); |
154 | } |
155 | libc_hidden_nolink_sunrpc (pmap_getport, GLIBC_2_0) |
156 | |