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