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 memset ((char *)&sun, 0, sizeof (sun));
61 sun.sun_family = AF_UNIX;
62 strcpy (sun.sun_path, hostname);
63 sock = RPC_ANYSOCK;
64 client = clntunix_create (&sun, prog, vers, &sock, 0, 0);
65 if (client == NULL)
66 return NULL;
67#if 0
68 /* This is not wanted. This would disable the user from having
69 a timeout in the clnt_call() call. Only a call to cnlt_control()
70 by the user should set the timeout value. */
71 tv.tv_sec = 25;
72 tv.tv_usec = 0;
73 clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
74#endif
75 return client;
76 }
77
78 if (__libc_rpc_gethostbyname (hostname, &sin) != 0)
79 return NULL;
80
81 prtbuflen = 1024;
82 prttmpbuf = __alloca (prtbuflen);
83 while (__getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p) != 0
84 || p == NULL)
85 if (errno != ERANGE)
86 {
87 struct rpc_createerr *ce = &get_rpc_createerr ();
88 ce->cf_stat = RPC_UNKNOWNPROTO;
89 ce->cf_error.re_errno = EPFNOSUPPORT;
90 return NULL;
91 }
92 else
93 {
94 /* Enlarge the buffer. */
95 prtbuflen *= 2;
96 prttmpbuf = __alloca (prtbuflen);
97 }
98
99 sock = RPC_ANYSOCK;
100 switch (p->p_proto)
101 {
102 case IPPROTO_UDP:
103 tv.tv_sec = 5;
104 tv.tv_usec = 0;
105 client = clntudp_create (&sin, prog, vers, tv, &sock);
106 if (client == NULL)
107 {
108 return NULL;
109 }
110#if 0
111 /* This is not wanted. This would disable the user from having
112 a timeout in the clnt_call() call. Only a call to cnlt_control()
113 by the user should set the timeout value. */
114 tv.tv_sec = 25;
115 clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
116#endif
117 break;
118 case IPPROTO_TCP:
119 client = clnttcp_create (&sin, prog, vers, &sock, 0, 0);
120 if (client == NULL)
121 {
122 return NULL;
123 }
124#if 0
125 /* This is not wanted. This would disable the user from having
126 a timeout in the clnt_call() call. Only a call to cnlt_control()
127 by the user should set the timeout value. */
128 tv.tv_sec = 25;
129 tv.tv_usec = 0;
130 clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
131#endif
132 break;
133 default:
134 {
135 struct rpc_createerr *ce = &get_rpc_createerr ();
136 ce->cf_stat = RPC_SYSTEMERROR;
137 ce->cf_error.re_errno = EPFNOSUPPORT;
138 }
139 return (NULL);
140 }
141 return client;
142}
143#ifdef EXPORT_RPC_SYMBOLS
144libc_hidden_def (clnt_create)
145#else
146libc_hidden_nolink_sunrpc (clnt_create, GLIBC_2_0)
147#endif
148