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 <rpc/rpc.h>
  39 #include <sys/socket.h>
  40 #include <sys/errno.h>
  41 #include <netdb.h>
  42
  43 /*
  44  * Generic client creation: takes (hostname, program-number, protocol) and
  45  * returns client handle. Default options are set, which the user can
  46  * change using the rpc equivalent of ioctl()'s.
  47  */
  48 CLIENT *
  49 clnt_create(hostname, prog, vers, proto)
  50         char *hostname;
  51         unsigned prog;
  52         unsigned vers;
  53         char *proto;
  54 {
  55         struct hostent hostbuf, *h;
  56         size_t hstbuflen;
  57         char *hsttmpbuf;
  58         struct protoent protobuf, *p;
  59         size_t prtbuflen;
  60         char *prttmpbuf;
  61         struct sockaddr_in sin;
  62         int sock;
  63         struct timeval tv;
  64         CLIENT *client;
  65         int herr;
  66         int save_errno;
  67
  68         hstbuflen = 1024;
  69         hsttmpbuf = __alloca (hstbuflen);
  70         save_errno = errno;
  71         while (__gethostbyname_r (hostname, &hostbuf, hsttmpbuf, hstbuflen,
  72                                   &h, &herr) < 0)
  73           if (herr != NETDB_INTERNAL || errno != ERANGE)
  74             {
  75               rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
  76               return NULL;
  77             }
  78           else
  79             {
  80               /* Enlarge the buffer.  */
  81               hstbuflen *= 2;
  82               hsttmpbuf = __alloca (hstbuflen);
  83               __set_errno (0);
  84             }
  85
  86         if (errno == 0)
  87           __set_errno (save_errno);
  88
  89         if (h->h_addrtype != AF_INET) {
  90                 /*
  91                  * Only support INET for now
  92                  */
  93                 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
  94                 rpc_createerr.cf_error.re_errno = EAFNOSUPPORT;
  95                 return (NULL);
  96         }
  97         sin.sin_family = h->h_addrtype;
  98         sin.sin_port = 0;
  99         bzero(sin.sin_zero, sizeof(sin.sin_zero));
 100         bcopy(h->h_addr, (char*)&sin.sin_addr, h->h_length);
 101
 102         prtbuflen = 1024;
 103         prttmpbuf = __alloca (prtbuflen);
 104         while (__getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p)
 105                < 0)
 106           if (errno != ERANGE)
 107             {
 108               rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 109               rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
 110               return NULL;
 111             }
 112           else
 113             {
 114               /* Enlarge the buffer.  */
 115               prtbuflen *= 2;
 116               prttmpbuf = __alloca (prtbuflen);
 117               __set_errno (0);
 118             }
 119
 120         sock = RPC_ANYSOCK;
 121         switch (p->p_proto) {
 122         case IPPROTO_UDP:
 123                 tv.tv_sec = 5;
 124                 tv.tv_usec = 0;
 125                 client = clntudp_create(&sin, prog, vers, tv, &sock);
 126                 if (client == NULL) {
 127                         return (NULL);
 128                 }
 129                 tv.tv_sec = 25;
 130                 clnt_control(client, CLSET_TIMEOUT, &tv);
 131                 break;
 132         case IPPROTO_TCP:
 133                 client = clnttcp_create(&sin, prog, vers, &sock, 0, 0);
 134                 if (client == NULL) {
 135                         return (NULL);
 136                 }
 137                 tv.tv_sec = 25;
 138                 tv.tv_usec = 0;
 139                 clnt_control(client, CLSET_TIMEOUT, &tv);
 140                 break;
 141         default:
 142                 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 143                 rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
 144                 return (NULL);
 145         }
 146         return (client);
 147 }