1/*
2 * Copyright (c) 2010, Oracle America, Inc.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following
12 * disclaimer in the documentation and/or other materials
13 * provided with the distribution.
14 * * Neither the name of the "Oracle America, Inc." nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
25 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <alloca.h>
33#include <errno.h>
34#include <string.h>
35#include <rpc/rpc.h>
36#include <sys/socket.h>
37#include <netdb.h>
38#include <shlib-compat.h>
39
40/*
41 * Generic client creation: takes (hostname, program-number, protocol) and
42 * returns client handle. Default options are set, which the user can
43 * change using the rpc equivalent of ioctl()'s.
44 */
45CLIENT *
46clnt_create (const char *hostname, u_long prog, u_long vers,
47 const char *proto)
48{
49 struct protoent protobuf, *p;
50 size_t prtbuflen;
51 char *prttmpbuf;
52 struct sockaddr_in sin;
53 struct sockaddr_un sun;
54 int sock;
55 struct timeval tv;
56 CLIENT *client;
57
58 if (strcmp (proto, "unix") == 0)
59 {
60 if (__sockaddr_un_set (&sun, hostname) < 0)
61 {
62 struct rpc_createerr *ce = &get_rpc_createerr ();
63 ce->cf_stat = RPC_SYSTEMERROR;
64 ce->cf_error.re_errno = errno;
65 return NULL;
66 }
67 sock = RPC_ANYSOCK;
68 client = clntunix_create (&sun, prog, vers, &sock, 0, 0);
69 if (client == NULL)
70 return NULL;
71#if 0
72 /* This is not wanted. This would disable the user from having
73 a timeout in the clnt_call() call. Only a call to cnlt_control()
74 by the user should set the timeout value. */
75 tv.tv_sec = 25;
76 tv.tv_usec = 0;
77 clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
78#endif
79 return client;
80 }
81
82 if (__libc_rpc_gethostbyname (hostname, &sin) != 0)
83 return NULL;
84
85 prtbuflen = 1024;
86 prttmpbuf = __alloca (prtbuflen);
87 while (__getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p) != 0
88 || p == NULL)
89 if (errno != ERANGE)
90 {
91 struct rpc_createerr *ce = &get_rpc_createerr ();
92 ce->cf_stat = RPC_UNKNOWNPROTO;
93 ce->cf_error.re_errno = EPFNOSUPPORT;
94 return NULL;
95 }
96 else
97 {
98 /* Enlarge the buffer. */
99 prtbuflen *= 2;
100 prttmpbuf = __alloca (prtbuflen);
101 }
102
103 sock = RPC_ANYSOCK;
104 switch (p->p_proto)
105 {
106 case IPPROTO_UDP:
107 tv.tv_sec = 5;
108 tv.tv_usec = 0;
109 client = clntudp_create (&sin, prog, vers, tv, &sock);
110 if (client == NULL)
111 {
112 return NULL;
113 }
114#if 0
115 /* This is not wanted. This would disable the user from having
116 a timeout in the clnt_call() call. Only a call to cnlt_control()
117 by the user should set the timeout value. */
118 tv.tv_sec = 25;
119 clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
120#endif
121 break;
122 case IPPROTO_TCP:
123 client = clnttcp_create (&sin, prog, vers, &sock, 0, 0);
124 if (client == NULL)
125 {
126 return NULL;
127 }
128#if 0
129 /* This is not wanted. This would disable the user from having
130 a timeout in the clnt_call() call. Only a call to cnlt_control()
131 by the user should set the timeout value. */
132 tv.tv_sec = 25;
133 tv.tv_usec = 0;
134 clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
135#endif
136 break;
137 default:
138 {
139 struct rpc_createerr *ce = &get_rpc_createerr ();
140 ce->cf_stat = RPC_SYSTEMERROR;
141 ce->cf_error.re_errno = EPFNOSUPPORT;
142 }
143 return (NULL);
144 }
145 return client;
146}
147#ifdef EXPORT_RPC_SYMBOLS
148libc_hidden_def (clnt_create)
149#else
150libc_hidden_nolink_sunrpc (clnt_create, GLIBC_2_0)
151#endif
152