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 <alloca.h>
  42 #include <errno.h>
  43 #include <stdio.h>
  44 #include <rpc/rpc.h>
  45 #include <sys/socket.h>
  46 #include <netdb.h>
  47 #include <strings.h>
  48
  49 static struct callrpc_private {
  50         CLIENT  *client;
  51         int     socket;
  52         int     oldprognum, oldversnum, valid;
  53         char    *oldhost;
  54 } *callrpc_private;
  55
  56 callrpc(host, prognum, versnum, procnum, inproc, in, outproc, out)
  57         char *host;
  58         xdrproc_t inproc, outproc;
  59         char *in, *out;
  60 {
  61         register struct callrpc_private *crp = callrpc_private;
  62         struct sockaddr_in server_addr;
  63         enum clnt_stat clnt_stat;
  64         struct hostent hostbuf, *hp;
  65         struct timeval timeout, tottimeout;
  66         int save_errno;
  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                 size_t buflen;
  84                 char *buffer;
  85                 int herr;
  86
  87                 crp->valid = 0;
  88                 if (crp->socket != RPC_ANYSOCK)
  89                   {
  90                     (void)close(crp->socket);
  91                     crp->socket = RPC_ANYSOCK;
  92                   }
  93                 if (crp->client) {
  94                         clnt_destroy(crp->client);
  95                         crp->client = NULL;
  96                 }
  97
  98                 buflen = 1024;
  99                 buffer = __alloca (buflen);
 100                 save_errno = errno;
 101
 102                 while (__gethostbyname_r (host, &hostbuf, buffer, buflen,
 103                                           &hp, &herr) < 0)
 104                   if (herr != NETDB_INTERNAL || errno != ERANGE)
 105                     return (int) RPC_UNKNOWNHOST;
 106                   else
 107                     {
 108                       /* Enlarge the buffer.  */
 109                       buflen *= 2;
 110                       buffer = __alloca (buflen);
 111                       __set_errno (0);
 112                     }
 113
 114                 if (errno == 0)
 115                   __set_errno (save_errno);
 116
 117                 timeout.tv_usec = 0;
 118                 timeout.tv_sec = 5;
 119                 bcopy(hp->h_addr, (char *)&server_addr.sin_addr, hp->h_length);
 120                 server_addr.sin_family = AF_INET;
 121                 server_addr.sin_port =  0;
 122                 if ((crp->client = clntudp_create(&server_addr, (u_long)prognum,
 123                     (u_long)versnum, timeout, &crp->socket)) == NULL)
 124                         return ((int) rpc_createerr.cf_stat);
 125                 crp->valid = 1;
 126                 crp->oldprognum = prognum;
 127                 crp->oldversnum = versnum;
 128                 (void) strncpy (crp->oldhost, host, 255);
 129                 crp->oldhost[256] = '\0';
 130         }
 131         tottimeout.tv_sec = 25;
 132         tottimeout.tv_usec = 0;
 133         clnt_stat = clnt_call(crp->client, procnum, inproc, in,
 134             outproc, out, tottimeout);
 135         /*
 136          * if call failed, empty cache
 137          */
 138         if (clnt_stat != RPC_SUCCESS)
 139                 crp->valid = 0;
 140         return ((int) clnt_stat);
 141 }