sunrpc/clnt_gen.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 /*
  30  * Copyright (C) 1987, Sun Microsystems, Inc.
  31  */
  32
  33 #include <alloca.h>
  34 #include <errno.h>
  35 #include <string.h>
  36 #include <rpc/rpc.h>
  37 #include <sys/socket.h>
  38 #include <sys/errno.h>
  39 #include <netdb.h>
  40
  41 /*
  42  * Generic client creation: takes (hostname, program-number, protocol) and
  43  * returns client handle. Default options are set, which the user can
  44  * change using the rpc equivalent of ioctl()'s.
  45  */
  46 CLIENT *
  47 clnt_create (const char *hostname, u_long prog, u_long vers,
  48              const char *proto)
  49 {
  50   struct hostent hostbuf, *h;
  51   size_t hstbuflen;
  52   char *hsttmpbuf;
  53   struct protoent protobuf, *p;
  54   size_t prtbuflen;
  55   char *prttmpbuf;
  56   struct sockaddr_in sin;
  57   struct sockaddr_un sun;
  58   int sock;
  59   struct timeval tv;
  60   CLIENT *client;
  61   int herr;
  62
  63   if (strcmp (proto, "unix") == 0)
  64     {
  65       __bzero ((char *)&sun, sizeof (sun));
  66       sun.sun_family = AF_UNIX;
  67       strcpy (sun.sun_path, hostname);
  68       sock = RPC_ANYSOCK;
  69       client = clntunix_create (&sun, prog, vers, &sock, 0, 0);
  70       if (client == NULL)
  71         return NULL;
  72 #if 0
  73       /* This is not wanted.  This would disable the user from having
  74          a timeout in the clnt_call() call.  Only a call to cnlt_control()
  75          by the user should set the timeout value.  */
  76       tv.tv_sec = 25;
  77       tv.tv_usec = 0;
  78       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
  79 #endif
  80       return client;
  81     }
  82
  83   hstbuflen = 1024;
  84   hsttmpbuf = __alloca (hstbuflen);
  85   while (__gethostbyname_r (hostname, &hostbuf, hsttmpbuf, hstbuflen,
  86                             &h, &herr) != 0
  87          || h == NULL)
  88     if (herr != NETDB_INTERNAL || errno != ERANGE)
  89       {
  90         get_rpc_createerr().cf_stat = RPC_UNKNOWNHOST;
  91         return NULL;
  92       }
  93     else
  94       {
  95         /* Enlarge the buffer.  */
  96         hstbuflen *= 2;
  97         hsttmpbuf = __alloca (hstbuflen);
  98       }
  99
 100   if (h->h_addrtype != AF_INET)
 101     {
 102       /*
 103        * Only support INET for now
 104        */
 105       struct rpc_createerr *ce = &get_rpc_createerr ();
 106       ce->cf_stat = RPC_SYSTEMERROR;
 107       ce->cf_error.re_errno = EAFNOSUPPORT;
 108       return NULL;
 109     }
 110   sin.sin_family = h->h_addrtype;
 111   sin.sin_port = 0;
 112   __bzero (sin.sin_zero, sizeof (sin.sin_zero));
 113   memcpy ((char *) &sin.sin_addr, h->h_addr, h->h_length);
 114
 115   prtbuflen = 1024;
 116   prttmpbuf = __alloca (prtbuflen);
 117   while (__getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p) != 0
 118          || p == NULL)
 119     if (errno != ERANGE)
 120       {
 121         struct rpc_createerr *ce = &get_rpc_createerr ();
 122         ce->cf_stat = RPC_UNKNOWNPROTO;
 123         ce->cf_error.re_errno = EPFNOSUPPORT;
 124         return NULL;
 125       }
 126     else
 127       {
 128         /* Enlarge the buffer.  */
 129         prtbuflen *= 2;
 130         prttmpbuf = __alloca (prtbuflen);
 131       }
 132
 133   sock = RPC_ANYSOCK;
 134   switch (p->p_proto)
 135     {
 136     case IPPROTO_UDP:
 137       tv.tv_sec = 5;
 138       tv.tv_usec = 0;
 139       client = clntudp_create (&sin, prog, vers, tv, &sock);
 140       if (client == NULL)
 141         {
 142           return NULL;
 143         }
 144 #if 0
 145       /* This is not wanted.  This would disable the user from having
 146          a timeout in the clnt_call() call.  Only a call to cnlt_control()
 147          by the user should set the timeout value.  */
 148       tv.tv_sec = 25;
 149       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 150 #endif
 151       break;
 152     case IPPROTO_TCP:
 153       client = clnttcp_create (&sin, prog, vers, &sock, 0, 0);
 154       if (client == NULL)
 155         {
 156           return NULL;
 157         }
 158 #if 0
 159       /* This is not wanted.  This would disable the user from having
 160          a timeout in the clnt_call() call.  Only a call to cnlt_control()
 161          by the user should set the timeout value.  */
 162       tv.tv_sec = 25;
 163       tv.tv_usec = 0;
 164       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 165 #endif
 166       break;
 167     default:
 168       {
 169         struct rpc_createerr *ce = &get_rpc_createerr ();
 170         ce->cf_stat = RPC_SYSTEMERROR;
 171         ce->cf_error.re_errno = EPFNOSUPPORT;
 172       }
 173       return (NULL);
 174     }
 175   return client;
 176 }