lib/libc/rpc/clnt_simple.c

   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  * @(#)clnt_simple.c 1.35 87/08/11 Copyr 1984 Sun Micro
  30  * @(#)clnt_simple.c    2.2 88/08/01 4.0 RPCSRC
  31  * $FreeBSD: src/lib/libc/rpc/clnt_simple.c,v 1.12 2000/01/27 23:06:35 jasone Exp $
  32  * $DragonFly: src/lib/libc/rpc/clnt_simple.c,v 1.5 2005/11/13 12:27:04 swildner Exp $
  33  */
  34
  35 /*
  36  * clnt_simple.c
  37  * Simplified front end to rpc.
  38  *
  39  * Copyright (C) 1984, Sun Microsystems, Inc.
  40  */
  41
  42 #include "namespace.h"
  43 #include <sys/param.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <unistd.h>
  47 #include <string.h>
  48 #include <rpc/rpc.h>
  49 #include <sys/socket.h>
  50 #include <netdb.h>
  51 #include "un-namespace.h"
  52
  53 static struct callrpc_private {
  54         CLIENT  *client;
  55         int     socket;
  56         int     oldprognum, oldversnum, valid;
  57         char    *oldhost;
  58 } *callrpc_private;
  59
  60 int
  61 callrpc(char *host, int prognum, int versnum, int procnum, xdrproc_t inproc,
  62         char *in, xdrproc_t outproc, char *out)
  63 {
  64         struct callrpc_private *crp = callrpc_private;
  65         struct sockaddr_in server_addr;
  66         enum clnt_stat clnt_stat;
  67         struct hostent *hp;
  68         struct timeval timeout, tottimeout;
  69
  70         if (crp == 0) {
  71                 crp = (struct callrpc_private *)calloc(1, sizeof (*crp));
  72                 if (crp == 0)
  73                         return (0);
  74                 callrpc_private = crp;
  75         }
  76         if (crp->oldhost == NULL) {
  77                 crp->oldhost = malloc(MAXHOSTNAMELEN);
  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                         _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                 strcpy(crp->oldhost, host);
 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 }