1 /* $OpenBSD: clnt_generic.c,v 1.7 2010/09/01 14:43:34 millert Exp $ */
2
3 /*
4 * Copyright (c) 2010, Oracle America, Inc.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following
14 * disclaimer in the documentation and/or other materials
15 * provided with the distribution.
16 * * Neither the name of the "Oracle America, Inc." nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include <errno.h>
35 #include <string.h>
36 #include <rpc/rpc.h>
37 #include <sys/socket.h>
38 #include <netdb.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 */
45 CLIENT *
clnt_create(char * hostname,u_long prog,u_long vers,char * proto)46 clnt_create(char *hostname, u_long prog, u_long vers, char *proto)
47 {
48 struct hostent *h;
49 struct protoent *p;
50 struct sockaddr_in sin;
51 int sock;
52 struct timeval tv;
53 CLIENT *client;
54
55 h = gethostbyname(hostname);
56 if (h == NULL) {
57 rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
58 return (NULL);
59 }
60 if (h->h_addrtype != AF_INET) {
61 /*
62 * Only support INET for now
63 */
64 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
65 rpc_createerr.cf_error.re_errno = EAFNOSUPPORT;
66 return (NULL);
67 }
68 memset(&sin, 0, sizeof(sin));
69 sin.sin_len = sizeof(struct sockaddr_in);
70 sin.sin_family = h->h_addrtype;
71 sin.sin_port = 0;
72 memcpy((char*)&sin.sin_addr, h->h_addr, h->h_length);
73 p = getprotobyname(proto);
74 if (p == NULL) {
75 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
76 rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
77 return (NULL);
78 }
79 sock = RPC_ANYSOCK;
80 switch (p->p_proto) {
81 case IPPROTO_UDP:
82 tv.tv_sec = 5;
83 tv.tv_usec = 0;
84 client = clntudp_create(&sin, prog, vers, tv, &sock);
85 if (client == NULL) {
86 return (NULL);
87 }
88 break;
89 case IPPROTO_TCP:
90 client = clnttcp_create(&sin, prog, vers, &sock, 0, 0);
91 if (client == NULL) {
92 return (NULL);
93 }
94 break;
95 default:
96 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
97 rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
98 return (NULL);
99 }
100 return (client);
101 }
102