xref: /openbsd-src/lib/libc/rpc/clnt_simple.c (revision a28daedfc357b214be5c701aa8ba8adb29a7f1c2)
1 /*	$OpenBSD: clnt_simple.c,v 1.13 2006/01/17 15:43:34 millert Exp $ */
2 /*
3  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
4  * unrestricted use provided that this legend is included on all tape
5  * media and as a part of the software program in whole or part.  Users
6  * may copy or modify Sun RPC without charge, but are not authorized
7  * to license or distribute it to anyone else except as part of a product or
8  * program developed by the user.
9  *
10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
13  *
14  * Sun RPC is provided with no support and without any obligation on the
15  * part of Sun Microsystems, Inc. to assist in its use, correction,
16  * modification or enhancement.
17  *
18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
20  * OR ANY PART THEREOF.
21  *
22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
23  * or profits or other special, indirect and consequential damages, even if
24  * Sun has been advised of the possibility of such damages.
25  *
26  * Sun Microsystems, Inc.
27  * 2550 Garcia Avenue
28  * Mountain View, California  94043
29  */
30 
31 /*
32  * clnt_simple.c
33  * Simplified front end to rpc.
34  *
35  * Copyright (C) 1984, Sun Microsystems, Inc.
36  */
37 
38 #include <sys/param.h>
39 #include <sys/socket.h>
40 #include <netdb.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45 #include <rpc/rpc.h>
46 
47 static struct callrpc_private {
48 	CLIENT	*client;
49 	int	socket;
50 	int	oldprognum, oldversnum, valid;
51 	char	*oldhost;
52 } *callrpc_private;
53 
54 int
55 callrpc(char *host, int prognum, int versnum, int procnum, xdrproc_t inproc,
56     char *in, xdrproc_t outproc, char *out)
57 {
58 	struct callrpc_private *save_callrpc_private = callrpc_private;
59 	struct callrpc_private *crp = callrpc_private;
60 	struct sockaddr_in server_addr;
61 	enum clnt_stat clnt_stat;
62 	struct hostent *hp;
63 	struct timeval timeout, tottimeout;
64 
65 	if (crp == NULL) {
66 		crp = (struct callrpc_private *)calloc(1, sizeof (*crp));
67 		if (crp == NULL)
68 			return (0);
69 		callrpc_private = crp;
70 	}
71 	if (crp->oldhost == NULL) {
72 		crp->oldhost = malloc(MAXHOSTNAMELEN);
73 		if (crp->oldhost == NULL) {
74 			free(crp);
75 			callrpc_private = save_callrpc_private;
76 			return (0);
77 		}
78 		crp->oldhost[0] = 0;
79 		crp->socket = RPC_ANYSOCK;
80 	}
81 	if (crp->valid && crp->oldprognum == prognum && crp->oldversnum == versnum
82 		&& strcmp(crp->oldhost, host) == 0) {
83 		/* reuse old client */
84 	} else {
85 		crp->valid = 0;
86 		if (crp->socket != -1)
87 			(void)close(crp->socket);
88 		crp->socket = RPC_ANYSOCK;
89 		if (crp->client) {
90 			clnt_destroy(crp->client);
91 			crp->client = NULL;
92 		}
93 		if ((hp = gethostbyname(host)) == NULL)
94 			return ((int) RPC_UNKNOWNHOST);
95 		timeout.tv_usec = 0;
96 		timeout.tv_sec = 5;
97 		memset(&server_addr, 0, sizeof(server_addr));
98 		memcpy((char *)&server_addr.sin_addr, hp->h_addr, hp->h_length);
99 		server_addr.sin_len = sizeof(struct sockaddr_in);
100 		server_addr.sin_family = AF_INET;
101 		server_addr.sin_port =  0;
102 		if ((crp->client = clntudp_create(&server_addr, (u_long)prognum,
103 		    (u_long)versnum, timeout, &crp->socket)) == NULL)
104 			return ((int) rpc_createerr.cf_stat);
105 		crp->valid = 1;
106 		crp->oldprognum = prognum;
107 		crp->oldversnum = versnum;
108 		strlcpy(crp->oldhost, host, MAXHOSTNAMELEN);
109 	}
110 	tottimeout.tv_sec = 25;
111 	tottimeout.tv_usec = 0;
112 	clnt_stat = clnt_call(crp->client, procnum, inproc, in,
113 	    outproc, out, tottimeout);
114 	/*
115 	 * if call failed, empty cache
116 	 */
117 	if (clnt_stat != RPC_SUCCESS)
118 		crp->valid = 0;
119 	return ((int) clnt_stat);
120 }
121