clnt_simple.c revision 21673 
1/*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part.  Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user.
8 *
9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
12 *
13 * Sun RPC is provided with no support and without any obligation on the
14 * part of Sun Microsystems, Inc. to assist in its use, correction,
15 * modification or enhancement.
16 *
17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19 * OR ANY PART THEREOF.
20 *
21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22 * or profits or other special, indirect and consequential damages, even if
23 * Sun has been advised of the possibility of such damages.
24 *
25 * Sun Microsystems, Inc.
26 * 2550 Garcia Avenue
27 * Mountain View, California  94043
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31/*static char *sccsid = "from: @(#)clnt_simple.c 1.35 87/08/11 Copyr 1984 Sun Micro";*/
32/*static char *sccsid = "from: @(#)clnt_simple.c	2.2 88/08/01 4.0 RPCSRC";*/
33static char *rcsid = "$FreeBSD: head/lib/libc/rpc/clnt_simple.c 21673 1997-01-14 07:20:47Z jkh $";
34#endif
35
36/*
37 * clnt_simple.c
38 * Simplified front end to rpc.
39 *
40 * Copyright (C) 1984, Sun Microsystems, Inc.
41 */
42
43#include <sys/param.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <unistd.h>
47#include <string.h>
48#include <rpc/rpc.h>
49#include <sys/socket.h>
50#include <netdb.h>
51
52static struct callrpc_private {
53	CLIENT	*client;
54	int	socket;
55	int	oldprognum, oldversnum, valid;
56	char	*oldhost;
57} *callrpc_private;
58
59int
60callrpc(host, prognum, versnum, procnum, inproc, in, outproc, out)
61	char *host;
62	int prognum, versnum, procnum;
63	xdrproc_t inproc, outproc;
64	char *in, *out;
65{
66	register struct callrpc_private *crp = callrpc_private;
67	struct sockaddr_in server_addr;
68	enum clnt_stat clnt_stat;
69	struct hostent *hp;
70	struct timeval timeout, tottimeout;
71
72	if (crp == 0) {
73		crp = (struct callrpc_private *)calloc(1, sizeof (*crp));
74		if (crp == 0)
75			return (0);
76		callrpc_private = crp;
77	}
78	if (crp->oldhost == NULL) {
79		crp->oldhost = malloc(MAXHOSTNAMELEN);
80		crp->oldhost[0] = 0;
81		crp->socket = RPC_ANYSOCK;
82	}
83	if (crp->valid && crp->oldprognum == prognum && crp->oldversnum == versnum
84		&& strcmp(crp->oldhost, host) == 0) {
85		/* reuse old client */
86	} else {
87		crp->valid = 0;
88		if (crp->socket != -1)
89			(void)close(crp->socket);
90		crp->socket = RPC_ANYSOCK;
91		if (crp->client) {
92			clnt_destroy(crp->client);
93			crp->client = NULL;
94		}
95		if ((hp = gethostbyname(host)) == NULL)
96			return ((int) RPC_UNKNOWNHOST);
97		timeout.tv_usec = 0;
98		timeout.tv_sec = 5;
99		memset(&server_addr, 0, sizeof(server_addr));
100		memcpy((char *)&server_addr.sin_addr, hp->h_addr, hp->h_length);
101		server_addr.sin_len = sizeof(struct sockaddr_in);
102		server_addr.sin_family = AF_INET;
103		server_addr.sin_port =  0;
104		if ((crp->client = clntudp_create(&server_addr, (u_long)prognum,
105		    (u_long)versnum, timeout, &crp->socket)) == NULL)
106			return ((int) rpc_createerr.cf_stat);
107		crp->valid = 1;
108		crp->oldprognum = prognum;
109		crp->oldversnum = versnum;
110		(void) strcpy(crp->oldhost, host);
111	}
112	tottimeout.tv_sec = 25;
113	tottimeout.tv_usec = 0;
114	clnt_stat = clnt_call(crp->client, procnum, inproc, in,
115	    outproc, out, tottimeout);
116	/*
117	 * if call failed, empty cache
118	 */
119	if (clnt_stat != RPC_SUCCESS)
120		crp->valid = 0;
121	return ((int) clnt_stat);
122}
123