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