1 | /* |
2 | * clnt_simple.c |
3 | * Simplified front end to rpc. |
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 <alloca.h> |
36 | #include <errno.h> |
37 | #include <stdio.h> |
38 | #include <unistd.h> |
39 | #include <rpc/rpc.h> |
40 | #include <sys/socket.h> |
41 | #include <netdb.h> |
42 | #include <string.h> |
43 | #include <shlib-compat.h> |
44 | |
45 | struct callrpc_private_s |
46 | { |
47 | CLIENT *client; |
48 | int socket; |
49 | u_long oldprognum, oldversnum, valid; |
50 | char *oldhost; |
51 | }; |
52 | #ifdef _RPC_THREAD_SAFE_ |
53 | #define callrpc_private RPC_THREAD_VARIABLE(callrpc_private_s) |
54 | #else |
55 | static struct callrpc_private_s *callrpc_private; |
56 | #endif |
57 | |
58 | int |
59 | callrpc (const char *host, u_long prognum, u_long versnum, u_long procnum, |
60 | xdrproc_t inproc, const char *in, xdrproc_t outproc, char *out) |
61 | { |
62 | struct callrpc_private_s *crp = callrpc_private; |
63 | struct sockaddr_in server_addr; |
64 | enum clnt_stat clnt_stat; |
65 | struct timeval timeout, tottimeout; |
66 | |
67 | if (crp == 0) |
68 | { |
69 | crp = (struct callrpc_private_s *) calloc (1, sizeof (*crp)); |
70 | if (crp == 0) |
71 | return 0; |
72 | callrpc_private = crp; |
73 | } |
74 | if (crp->oldhost == NULL) |
75 | { |
76 | crp->oldhost = malloc (256); |
77 | crp->oldhost[0] = 0; |
78 | crp->socket = RPC_ANYSOCK; |
79 | } |
80 | if (crp->valid && crp->oldprognum == prognum && crp->oldversnum == versnum |
81 | && strcmp (crp->oldhost, host) == 0) |
82 | { |
83 | /* reuse old client */ |
84 | } |
85 | else |
86 | { |
87 | crp->valid = 0; |
88 | if (crp->socket != RPC_ANYSOCK) |
89 | { |
90 | (void) __close (crp->socket); |
91 | crp->socket = RPC_ANYSOCK; |
92 | } |
93 | if (crp->client) |
94 | { |
95 | clnt_destroy (crp->client); |
96 | crp->client = NULL; |
97 | } |
98 | |
99 | if (__libc_rpc_gethostbyname (host, &server_addr) != 0) |
100 | return (int) get_rpc_createerr().cf_stat; |
101 | |
102 | timeout.tv_usec = 0; |
103 | timeout.tv_sec = 5; |
104 | if ((crp->client = clntudp_create (&server_addr, (u_long) prognum, |
105 | (u_long) versnum, timeout, &crp->socket)) == NULL) |
106 | return (int) get_rpc_createerr().cf_stat; |
107 | crp->valid = 1; |
108 | crp->oldprognum = prognum; |
109 | crp->oldversnum = versnum; |
110 | (void) strncpy (crp->oldhost, host, 255); |
111 | crp->oldhost[255] = '\0'; |
112 | } |
113 | tottimeout.tv_sec = 25; |
114 | tottimeout.tv_usec = 0; |
115 | clnt_stat = clnt_call (crp->client, procnum, inproc, (char *) in, |
116 | outproc, out, tottimeout); |
117 | /* |
118 | * if call failed, empty cache |
119 | */ |
120 | if (clnt_stat != RPC_SUCCESS) |
121 | crp->valid = 0; |
122 | return (int) clnt_stat; |
123 | } |
124 | libc_hidden_nolink_sunrpc (callrpc, GLIBC_2_0) |
125 | |
126 | #ifdef _RPC_THREAD_SAFE_ |
127 | void |
128 | __rpc_thread_clnt_cleanup (void) |
129 | { |
130 | struct callrpc_private_s *rcp = RPC_THREAD_VARIABLE(callrpc_private_s); |
131 | |
132 | if (rcp) { |
133 | if (rcp->client) |
134 | CLNT_DESTROY (rcp->client); |
135 | free (rcp); |
136 | } |
137 | } |
138 | #endif /* _RPC_THREAD_SAFE_ */ |
139 | |