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clnt_simple.c revision 1.2 
      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";*/
     33 static char *rcsid = "$Id: clnt_simple.c,v 1.2 1993/12/05 14:36:58 deraadt Exp $";
     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 <stdio.h>
     44 #include <stdlib.h>
     45 #include <string.h>
     46 #include <rpc/rpc.h>
     47 #include <sys/socket.h>
     48 #include <netdb.h>
     49 
     50 static struct callrpc_private {
     51 	CLIENT	*client;
     52 	int	socket;
     53 	int	oldprognum, oldversnum, valid;
     54 	char	*oldhost;
     55 } *callrpc_private;
     56 
     57 callrpc(host, prognum, versnum, procnum, inproc, in, outproc, out)
     58 	char *host;
     59 	xdrproc_t inproc, outproc;
     60 	char *in, *out;
     61 {
     62 	register struct callrpc_private *crp = callrpc_private;
     63 	struct sockaddr_in server_addr;
     64 	enum clnt_stat clnt_stat;
     65 	struct hostent *hp;
     66 	struct timeval timeout, tottimeout;
     67 
     68 	if (crp == 0) {
     69 		crp = (struct callrpc_private *)calloc(1, sizeof (*crp));
     70 		if (crp == 0)
     71 			return (0);
     72 		callrpc_private = crp;
     73 	}
     74 	if (crp->oldhost == NULL) {
     75 		crp->oldhost = malloc(256);
     76 		crp->oldhost[0] = 0;
     77 		crp->socket = RPC_ANYSOCK;
     78 	}
     79 	if (crp->valid && crp->oldprognum == prognum && crp->oldversnum == versnum
     80 		&& strcmp(crp->oldhost, host) == 0) {
     81 		/* reuse old client */
     82 	} else {
     83 		crp->valid = 0;
     84 		(void)close(crp->socket);
     85 		crp->socket = RPC_ANYSOCK;
     86 		if (crp->client) {
     87 			clnt_destroy(crp->client);
     88 			crp->client = NULL;
     89 		}
     90 		if ((hp = gethostbyname(host)) == NULL)
     91 			return ((int) RPC_UNKNOWNHOST);
     92 		timeout.tv_usec = 0;
     93 		timeout.tv_sec = 5;
     94 		bzero((char *)&server_addr, sizeof server_addr);
     95 		bcopy(hp->h_addr, (char *)&server_addr.sin_addr, hp->h_length);
     96 		server_addr.sin_family = AF_INET;
     97 		server_addr.sin_port =  0;
     98 		if ((crp->client = clntudp_create(&server_addr, (u_long)prognum,
     99 		    (u_long)versnum, timeout, &crp->socket)) == NULL)
    100 			return ((int) rpc_createerr.cf_stat);
    101 		crp->valid = 1;
    102 		crp->oldprognum = prognum;
    103 		crp->oldversnum = versnum;
    104 		(void) strcpy(crp->oldhost, host);
    105 	}
    106 	tottimeout.tv_sec = 25;
    107 	tottimeout.tv_usec = 0;
    108 	clnt_stat = clnt_call(crp->client, procnum, inproc, in,
    109 	    outproc, out, tottimeout);
    110 	/*
    111 	 * if call failed, empty cache
    112 	 */
    113 	if (clnt_stat != RPC_SUCCESS)
    114 		crp->valid = 0;
    115 	return ((int) clnt_stat);
    116 }
    117