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clnt_simple.c revision 1.8 
      1 /*	$NetBSD: clnt_simple.c,v 1.8 1997/07/13 20:13:06 christos 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 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char *sccsid = "@(#)clnt_simple.c 1.35 87/08/11 Copyr 1984 Sun Micro";
     36 static char *sccsid = "@(#)clnt_simple.c	2.2 88/08/01 4.0 RPCSRC";
     37 #else
     38 __RCSID("$NetBSD: clnt_simple.c,v 1.8 1997/07/13 20:13:06 christos Exp $");
     39 #endif
     40 #endif
     41 
     42 /*
     43  * clnt_simple.c
     44  * Simplified front end to rpc.
     45  *
     46  * Copyright (C) 1984, Sun Microsystems, Inc.
     47  */
     48 
     49 #include <stdio.h>
     50 #include <stdlib.h>
     51 #include <string.h>
     52 #include <unistd.h>
     53 #include <rpc/rpc.h>
     54 #include <sys/socket.h>
     55 #include <netdb.h>
     56 
     57 static struct callrpc_private {
     58 	CLIENT	*client;
     59 	int	socket;
     60 	int	oldprognum, oldversnum, valid;
     61 	char	*oldhost;
     62 } *callrpc_private;
     63 
     64 int
     65 callrpc(host, prognum, versnum, procnum, inproc, in, outproc, out)
     66 	char *host;
     67 	int versnum, procnum;
     68 	xdrproc_t inproc, outproc;
     69 	char *in, *out;
     70 {
     71 	register struct callrpc_private *crp = callrpc_private;
     72 	struct sockaddr_in server_addr;
     73 	enum clnt_stat clnt_stat;
     74 	struct hostent *hp;
     75 	struct timeval timeout, tottimeout;
     76 
     77 	if (crp == 0) {
     78 		crp = (struct callrpc_private *)calloc(1, sizeof (*crp));
     79 		if (crp == 0)
     80 			return (0);
     81 		callrpc_private = crp;
     82 	}
     83 	if (crp->oldhost == NULL) {
     84 		crp->oldhost = malloc(256);
     85 		crp->oldhost[0] = 0;
     86 		crp->socket = RPC_ANYSOCK;
     87 	}
     88 	if (crp->valid && crp->oldprognum == prognum && crp->oldversnum == versnum
     89 		&& strcmp(crp->oldhost, host) == 0) {
     90 		/* reuse old client */
     91 	} else {
     92 		crp->valid = 0;
     93 		(void)close(crp->socket);
     94 		crp->socket = RPC_ANYSOCK;
     95 		if (crp->client) {
     96 			clnt_destroy(crp->client);
     97 			crp->client = NULL;
     98 		}
     99 		if ((hp = gethostbyname(host)) == NULL)
    100 			return ((int) RPC_UNKNOWNHOST);
    101 		timeout.tv_usec = 0;
    102 		timeout.tv_sec = 5;
    103 		memset(&server_addr, 0, sizeof(server_addr));
    104 		bcopy(hp->h_addr, (char *)&server_addr.sin_addr, hp->h_length);
    105 		server_addr.sin_len = sizeof(struct sockaddr_in);
    106 		server_addr.sin_family = AF_INET;
    107 		server_addr.sin_port =  0;
    108 		if ((crp->client = clntudp_create(&server_addr, (u_long)prognum,
    109 		    (u_long)versnum, timeout, &crp->socket)) == NULL)
    110 			return ((int) rpc_createerr.cf_stat);
    111 		crp->valid = 1;
    112 		crp->oldprognum = prognum;
    113 		crp->oldversnum = versnum;
    114 		(void)strncpy(crp->oldhost, host, 256 - 1);
    115 	}
    116 	tottimeout.tv_sec = 25;
    117 	tottimeout.tv_usec = 0;
    118 	clnt_stat = clnt_call(crp->client, procnum, inproc, in,
    119 	    outproc, out, tottimeout);
    120 	/*
    121 	 * if call failed, empty cache
    122 	 */
    123 	if (clnt_stat != RPC_SUCCESS)
    124 		crp->valid = 0;
    125 	return ((int) clnt_stat);
    126 }
    127