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   struct sockaddr_un sun;
  61   int sock;
  62   struct timeval tv;
  63   CLIENT *client;
  64   int herr;
  65
  66   if (strcmp (proto, "unix") == 0)
  67     {
  68       __bzero ((char *)&sun, sizeof (sun));
  69       sun.sun_family = AF_UNIX;
  70       strcpy (sun.sun_path, hostname);
  71       sock = RPC_ANYSOCK;
  72       client = clntunix_create (&sun, prog, vers, &sock, 0, 0);
  73       if (client == NULL)
  74         return NULL;
  75       tv.tv_sec = 25;
  76       tv.tv_usec = 0;
  77       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
  78       return client;
  79     }
  80
  81   hstbuflen = 1024;
  82   hsttmpbuf = __alloca (hstbuflen);
  83   while (__gethostbyname_r (hostname, &hostbuf, hsttmpbuf, hstbuflen,
  84                             &h, &herr) < 0)
  85     if (herr != NETDB_INTERNAL || errno != ERANGE)
  86       {
  87         rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
  88         return NULL;
  89       }
  90     else
  91       {
  92         /* Enlarge the buffer.  */
  93         hstbuflen *= 2;
  94         hsttmpbuf = __alloca (hstbuflen);
  95       }
  96
  97   if (h->h_addrtype != AF_INET)
  98     {
  99       /*
 100        * Only support INET for now
 101        */
 102       rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 103       rpc_createerr.cf_error.re_errno = EAFNOSUPPORT;
 104       return NULL;
 105     }
 106   sin.sin_family = h->h_addrtype;
 107   sin.sin_port = 0;
 108   __bzero (sin.sin_zero, sizeof (sin.sin_zero));
 109   bcopy (h->h_addr, (char *) &sin.sin_addr, h->h_length);
 110
 111   prtbuflen = 1024;
 112   prttmpbuf = __alloca (prtbuflen);
 113   while (__getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p)
 114          < 0)
 115     if (errno != ERANGE)
 116       {
 117         rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 118         rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
 119         return NULL;
 120       }
 121     else
 122       {
 123         /* Enlarge the buffer.  */
 124         prtbuflen *= 2;
 125         prttmpbuf = __alloca (prtbuflen);
 126       }
 127
 128   sock = RPC_ANYSOCK;
 129   switch (p->p_proto)
 130     {
 131     case IPPROTO_UDP:
 132       tv.tv_sec = 5;
 133       tv.tv_usec = 0;
 134       client = clntudp_create (&sin, prog, vers, tv, &sock);
 135       if (client == NULL)
 136         {
 137           return NULL;
 138         }
 139       tv.tv_sec = 25;
 140       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 141       break;
 142     case IPPROTO_TCP:
 143       client = clnttcp_create (&sin, prog, vers, &sock, 0, 0);
 144       if (client == NULL)
 145         {
 146           return NULL;
 147         }
 148       tv.tv_sec = 25;
 149       tv.tv_usec = 0;
 150       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 151       break;
 152     default:
 153       rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 154       rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
 155       return (NULL);
 156     }
 157   return client;
 158 }