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clnt_simple.c revision 1.7 
      1 /*	$NetBSD: clnt_simple.c,v 1.7 1997/01/23 14:02:16 mrg Exp $	*/
      2 
      3 /*
      4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
      5  * unrestricted use provided that this legend is included on all tape
      6  * media and as a part of the software program in whole or part.  Users
      7  * may copy or modify Sun RPC without charge, but are not authorized
      8  * to license or distribute it to anyone else except as part of a product or
      9  * program developed by the user.
     10  *
     11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
     12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
     13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
     14  *
     15  * Sun RPC is provided with no support and without any obligation on the
     16  * part of Sun Microsystems, Inc. to assist in its use, correction,
     17  * modification or enhancement.
     18  *
     19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
     20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
     21  * OR ANY PART THEREOF.
     22  *
     23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
     24  * or profits or other special, indirect and consequential damages, even if
     25  * Sun has been advised of the possibility of such damages.
     26  *
     27  * Sun Microsystems, Inc.
     28  * 2550 Garcia Avenue
     29  * Mountain View, California  94043
     30  */
     31 
     32 #if defined(LIBC_SCCS) && !defined(lint)
     33 /*static char *sccsid = "from: @(#)clnt_simple.c 1.35 87/08/11 Copyr 1984 Sun Micro";*/
     34 /*static char *sccsid = "from: @(#)clnt_simple.c	2.2 88/08/01 4.0 RPCSRC";*/
     35 static char *rcsid = "$NetBSD: clnt_simple.c,v 1.7 1997/01/23 14:02:16 mrg Exp $";
     36 #endif
     37 
     38 /*
     39  * clnt_simple.c
     40  * Simplified front end to rpc.
     41  *
     42  * Copyright (C) 1984, Sun Microsystems, Inc.
     43  */
     44 
     45 #include <stdio.h>
     46 #include <stdlib.h>
     47 #include <string.h>
     48 #include <rpc/rpc.h>
     49 #include <sys/socket.h>
     50 #include <netdb.h>
     51 
     52 static struct callrpc_private {
     53 	CLIENT	*client;
     54 	int	socket;
     55 	int	oldprognum, oldversnum, valid;
     56 	char	*oldhost;
     57 } *callrpc_private;
     58 
     59 int
     60 callrpc(host, prognum, versnum, procnum, inproc, in, outproc, out)
     61 	char *host;
     62 	xdrproc_t inproc, outproc;
     63 	char *in, *out;
     64 {
     65 	register struct callrpc_private *crp = callrpc_private;
     66 	struct sockaddr_in server_addr;
     67 	enum clnt_stat clnt_stat;
     68 	struct hostent *hp;
     69 	struct timeval timeout, tottimeout;
     70 
     71 	if (crp == 0) {
     72 		crp = (struct callrpc_private *)calloc(1, sizeof (*crp));
     73 		if (crp == 0)
     74 			return (0);
     75 		callrpc_private = crp;
     76 	}
     77 	if (crp->oldhost == NULL) {
     78 		crp->oldhost = malloc(256);
     79 		crp->oldhost[0] = 0;
     80 		crp->socket = RPC_ANYSOCK;
     81 	}
     82 	if (crp->valid && crp->oldprognum == prognum && crp->oldversnum == versnum
     83 		&& strcmp(crp->oldhost, host) == 0) {
     84 		/* reuse old client */
     85 	} else {
     86 		crp->valid = 0;
     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 		bcopy(hp->h_addr, (char *)&server_addr.sin_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 		(void)strncpy(crp->oldhost, host, 256 - 1);
    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