sunrpc/clnt_simp.c

   1 /* @(#)clnt_simple.c    2.2 88/08/01 4.0 RPCSRC */
   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 #if !defined(lint) && defined(SCCSIDS)
  31 static char sccsid[] = "@(#)clnt_simple.c 1.35 87/08/11 Copyr 1984 Sun Micro";
  32 #endif
  33
  34 /*
  35  * clnt_simple.c
  36  * Simplified front end to rpc.
  37  *
  38  * Copyright (C) 1984, Sun Microsystems, Inc.
  39  */
  40
  41 #include <stdio.h>
  42 #include <rpc/rpc.h>
  43 #include <sys/socket.h>
  44 #include <netdb.h>
  45 #include <strings.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 callrpc(host, prognum, versnum, procnum, inproc, in, outproc, out)
  55         char *host;
  56         xdrproc_t inproc, outproc;
  57         char *in, *out;
  58 {
  59         register 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 == 0) {
  66                 crp = (struct callrpc_private *)calloc(1, sizeof (*crp));
  67                 if (crp == 0)
  68                         return (0);
  69                 callrpc_private = crp;
  70         }
  71         if (crp->oldhost == NULL) {
  72                 crp->oldhost = malloc(256);
  73                 crp->oldhost[0] = 0;
  74                 crp->socket = RPC_ANYSOCK;
  75         }
  76         if (crp->valid && crp->oldprognum == prognum && crp->oldversnum == versnum
  77                 && strcmp(crp->oldhost, host) == 0) {
  78                 /* reuse old client */
  79         } else {
  80                 crp->valid = 0;
  81                 (void)close(crp->socket);
  82                 crp->socket = RPC_ANYSOCK;
  83                 if (crp->client) {
  84                         clnt_destroy(crp->client);
  85                         crp->client = NULL;
  86                 }
  87                 if ((hp = gethostbyname(host)) == NULL)
  88                         return ((int) RPC_UNKNOWNHOST);
  89                 timeout.tv_usec = 0;
  90                 timeout.tv_sec = 5;
  91                 bcopy(hp->h_addr, (char *)&server_addr.sin_addr, hp->h_length);
  92                 server_addr.sin_family = AF_INET;
  93                 server_addr.sin_port =  0;
  94                 if ((crp->client = clntudp_create(&server_addr, (u_long)prognum,
  95                     (u_long)versnum, timeout, &crp->socket)) == NULL)
  96                         return ((int) rpc_createerr.cf_stat);
  97                 crp->valid = 1;
  98                 crp->oldprognum = prognum;
  99                 crp->oldversnum = versnum;
 100                 (void) strcpy(crp->oldhost, host);
 101         }
 102         tottimeout.tv_sec = 25;
 103         tottimeout.tv_usec = 0;
 104         clnt_stat = clnt_call(crp->client, procnum, inproc, in,
 105             outproc, out, tottimeout);
 106         /*
 107          * if call failed, empty cache
 108          */
 109         if (clnt_stat != RPC_SUCCESS)
 110                 crp->valid = 0;
 111         return ((int) clnt_stat);
 112 }