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
39/*
40 * Generic client creation: takes (hostname, program-number, protocol) and
41 * returns client handle. Default options are set, which the user can
42 * change using the rpc equivalent of ioctl()'s.
43 */
44CLIENT *
45clnt_create (const char *hostname, u_long prog, u_long vers,
46 const char *proto)
47{
48 struct hostent hostbuf, *h;
49 size_t hstbuflen;
50 char *hsttmpbuf;
51 struct protoent protobuf, *p;
52 size_t prtbuflen;
53 char *prttmpbuf;
54 struct sockaddr_in sin;
55 struct sockaddr_un sun;
56 int sock;
57 struct timeval tv;
58 CLIENT *client;
59 int herr;
60
61 if (strcmp (proto, "unix") == 0)
62 {
63 __bzero ((char *)&sun, sizeof (sun));
64 sun.sun_family = AF_UNIX;
65 strcpy (sun.sun_path, hostname);
66 sock = RPC_ANYSOCK;
67 client = clntunix_create (&sun, prog, vers, &sock, 0, 0);
68 if (client == NULL)
69 return NULL;
70#if 0
71 /* This is not wanted. This would disable the user from having
72 a timeout in the clnt_call() call. Only a call to cnlt_control()
73 by the user should set the timeout value. */
74 tv.tv_sec = 25;
75 tv.tv_usec = 0;
76 clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
77#endif
78 return client;
79 }
80
81 hstbuflen = 1024;
82 hsttmpbuf = __alloca (hstbuflen);
83 while (__gethostbyname_r (hostname, &hostbuf, hsttmpbuf, hstbuflen,
84 &h, &herr) != 0
85 || h == NULL)
86 if (herr != NETDB_INTERNAL || errno != ERANGE)
87 {
88 get_rpc_createerr().cf_stat = RPC_UNKNOWNHOST;
89 return NULL;
90 }
91 else
92 {
93 /* Enlarge the buffer. */
94 hstbuflen *= 2;
95 hsttmpbuf = __alloca (hstbuflen);
96 }
97
98 if (h->h_addrtype != AF_INET)
99 {
100 /*
101 * Only support INET for now
102 */
103 struct rpc_createerr *ce = &get_rpc_createerr ();
104 ce->cf_stat = RPC_SYSTEMERROR;
105 ce->cf_error.re_errno = EAFNOSUPPORT;
106 return NULL;
107 }
108 sin.sin_family = h->h_addrtype;
109 sin.sin_port = 0;
110 __bzero (sin.sin_zero, sizeof (sin.sin_zero));
111 memcpy ((char *) &sin.sin_addr, h->h_addr, h->h_length);
112
113 prtbuflen = 1024;
114 prttmpbuf = __alloca (prtbuflen);
115 while (__getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p) != 0
116 || p == NULL)
117 if (errno != ERANGE)
118 {
119 struct rpc_createerr *ce = &get_rpc_createerr ();
120 ce->cf_stat = RPC_UNKNOWNPROTO;
121 ce->cf_error.re_errno = EPFNOSUPPORT;
122 return NULL;
123 }
124 else
125 {
126 /* Enlarge the buffer. */
127 prtbuflen *= 2;
128 prttmpbuf = __alloca (prtbuflen);
129 }
130
131 sock = RPC_ANYSOCK;
132 switch (p->p_proto)
133 {
134 case IPPROTO_UDP:
135 tv.tv_sec = 5;
136 tv.tv_usec = 0;
137 client = clntudp_create (&sin, prog, vers, tv, &sock);
138 if (client == NULL)
139 {
140 return NULL;
141 }
142#if 0
143 /* This is not wanted. This would disable the user from having
144 a timeout in the clnt_call() call. Only a call to cnlt_control()
145 by the user should set the timeout value. */
146 tv.tv_sec = 25;
147 clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
148#endif
149 break;
150 case IPPROTO_TCP:
151 client = clnttcp_create (&sin, prog, vers, &sock, 0, 0);
152 if (client == NULL)
153 {
154 return NULL;
155 }
156#if 0
157 /* This is not wanted. This would disable the user from having
158 a timeout in the clnt_call() call. Only a call to cnlt_control()
159 by the user should set the timeout value. */
160 tv.tv_sec = 25;
161 tv.tv_usec = 0;
162 clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
163#endif
164 break;
165 default:
166 {
167 struct rpc_createerr *ce = &get_rpc_createerr ();
168 ce->cf_stat = RPC_SYSTEMERROR;
169 ce->cf_error.re_errno = EPFNOSUPPORT;
170 }
171 return (NULL);
172 }
173 return client;
174}
175#ifdef EXPORT_RPC_SYMBOLS
176libc_hidden_def (clnt_create)
177#else
178libc_hidden_nolink_sunrpc (clnt_create, GLIBC_2_0)
179#endif
180