sunrpc/clnt_gen.c

   1 /* @(#)clnt_generic.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_generic.c 1.4 87/08/11 (C) 1987 SMI";
  32 #endif
  33 /*
  34  * Copyright (C) 1987, Sun Microsystems, Inc.
  35  */
  36 #include <alloca.h>
  37 #include <errno.h>
  38 #include <string.h>
  39 #include <rpc/rpc.h>
  40 #include <sys/socket.h>
  41 #include <sys/errno.h>
  42 #include <netdb.h>
  43
  44 /*
  45  * Generic client creation: takes (hostname, program-number, protocol) and
  46  * returns client handle. Default options are set, which the user can
  47  * change using the rpc equivalent of ioctl()'s.
  48  */
  49 CLIENT *
  50 clnt_create (const char *hostname, u_long prog, u_long vers,
  51              const char *proto)
  52 {
  53   struct hostent hostbuf, *h;
  54   size_t hstbuflen;
  55   char *hsttmpbuf;
  56   struct protoent protobuf, *p;
  57   size_t prtbuflen;
  58   char *prttmpbuf;
  59   struct sockaddr_in sin;
  60   int sock;
  61   struct timeval tv;
  62   CLIENT *client;
  63   int herr;
  64
  65   hstbuflen = 1024;
  66   hsttmpbuf = __alloca (hstbuflen);
  67   while (__gethostbyname_r (hostname, &hostbuf, hsttmpbuf, hstbuflen,
  68                             &h, &herr) < 0)
  69     if (herr != NETDB_INTERNAL || errno != ERANGE)
  70       {
  71         rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
  72         return NULL;
  73       }
  74     else
  75       {
  76         /* Enlarge the buffer.  */
  77         hstbuflen *= 2;
  78         hsttmpbuf = __alloca (hstbuflen);
  79       }
  80
  81   if (h->h_addrtype != AF_INET)
  82     {
  83       /*
  84        * Only support INET for now
  85        */
  86       rpc_createerr.cf_stat = RPC_SYSTEMERROR;
  87       rpc_createerr.cf_error.re_errno = EAFNOSUPPORT;
  88       return NULL;
  89     }
  90   sin.sin_family = h->h_addrtype;
  91   sin.sin_port = 0;
  92   bzero (sin.sin_zero, sizeof (sin.sin_zero));
  93   bcopy (h->h_addr, (char *) &sin.sin_addr, h->h_length);
  94
  95   prtbuflen = 1024;
  96   prttmpbuf = __alloca (prtbuflen);
  97   while (__getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p)
  98          < 0)
  99     if (errno != ERANGE)
 100       {
 101         rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 102         rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
 103         return NULL;
 104       }
 105     else
 106       {
 107         /* Enlarge the buffer.  */
 108         prtbuflen *= 2;
 109         prttmpbuf = __alloca (prtbuflen);
 110       }
 111
 112   sock = RPC_ANYSOCK;
 113   switch (p->p_proto)
 114     {
 115     case IPPROTO_UDP:
 116       tv.tv_sec = 5;
 117       tv.tv_usec = 0;
 118       client = clntudp_create (&sin, prog, vers, tv, &sock);
 119       if (client == NULL)
 120         {
 121           return NULL;
 122         }
 123       tv.tv_sec = 25;
 124       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 125       break;
 126     case IPPROTO_TCP:
 127       client = clnttcp_create (&sin, prog, vers, &sock, 0, 0);
 128       if (client == NULL)
 129         {
 130           return NULL;
 131         }
 132       tv.tv_sec = 25;
 133       tv.tv_usec = 0;
 134       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 135       break;
 136     default:
 137       rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 138       rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
 139       return (NULL);
 140     }
 141   return client;
 142 }