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 | |
44 | struct callrpc_private_s |
45 | { |
46 | CLIENT *client; |
47 | int socket; |
48 | u_long oldprognum, oldversnum, valid; |
49 | char *oldhost; |
50 | }; |
51 | #ifdef _RPC_THREAD_SAFE_ |
52 | #define callrpc_private RPC_THREAD_VARIABLE(callrpc_private_s) |
53 | #else |
54 | static struct callrpc_private_s *callrpc_private; |
55 | #endif |
56 | |
57 | int |
58 | callrpc (const char *host, u_long prognum, u_long versnum, u_long procnum, |
59 | xdrproc_t inproc, const char *in, xdrproc_t outproc, char *out) |
60 | { |
61 | struct callrpc_private_s *crp = callrpc_private; |
62 | struct sockaddr_in server_addr; |
63 | enum clnt_stat clnt_stat; |
64 | struct hostent hostbuf, *hp; |
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 | size_t buflen; |
88 | char *buffer; |
89 | int herr; |
90 | |
91 | crp->valid = 0; |
92 | if (crp->socket != RPC_ANYSOCK) |
93 | { |
94 | (void) __close (crp->socket); |
95 | crp->socket = RPC_ANYSOCK; |
96 | } |
97 | if (crp->client) |
98 | { |
99 | clnt_destroy (crp->client); |
100 | crp->client = NULL; |
101 | } |
102 | |
103 | buflen = 1024; |
104 | buffer = __alloca (buflen); |
105 | while (__gethostbyname_r (host, &hostbuf, buffer, buflen, |
106 | &hp, &herr) != 0 |
107 | || hp == NULL) |
108 | if (herr != NETDB_INTERNAL || errno != ERANGE) |
109 | return (int) RPC_UNKNOWNHOST; |
110 | else |
111 | { |
112 | /* Enlarge the buffer. */ |
113 | buflen *= 2; |
114 | buffer = __alloca (buflen); |
115 | } |
116 | |
117 | timeout.tv_usec = 0; |
118 | timeout.tv_sec = 5; |
119 | memcpy ((char *) &server_addr.sin_addr, hp->h_addr, hp->h_length); |
120 | server_addr.sin_family = AF_INET; |
121 | server_addr.sin_port = 0; |
122 | if ((crp->client = clntudp_create (&server_addr, (u_long) prognum, |
123 | (u_long) versnum, timeout, &crp->socket)) == NULL) |
124 | return (int) get_rpc_createerr().cf_stat; |
125 | crp->valid = 1; |
126 | crp->oldprognum = prognum; |
127 | crp->oldversnum = versnum; |
128 | (void) strncpy (crp->oldhost, host, 255); |
129 | crp->oldhost[255] = '\0'; |
130 | } |
131 | tottimeout.tv_sec = 25; |
132 | tottimeout.tv_usec = 0; |
133 | clnt_stat = clnt_call (crp->client, procnum, inproc, (char *) in, |
134 | outproc, out, tottimeout); |
135 | /* |
136 | * if call failed, empty cache |
137 | */ |
138 | if (clnt_stat != RPC_SUCCESS) |
139 | crp->valid = 0; |
140 | return (int) clnt_stat; |
141 | } |
142 | libc_hidden_nolink_sunrpc (callrpc, GLIBC_2_0) |
143 | |
144 | #ifdef _RPC_THREAD_SAFE_ |
145 | void |
146 | __rpc_thread_clnt_cleanup (void) |
147 | { |
148 | struct callrpc_private_s *rcp = RPC_THREAD_VARIABLE(callrpc_private_s); |
149 | |
150 | if (rcp) { |
151 | if (rcp->client) |
152 | CLNT_DESTROY (rcp->client); |
153 | free (rcp); |
154 | } |
155 | } |
156 | #endif /* _RPC_THREAD_SAFE_ */ |
157 | |