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         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       rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 106       rpc_createerr.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   bcopy (h->h_addr, (char *) &sin.sin_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         rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 121         rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
 122         return NULL;
 123       }
 124     else
 125       {
 126         /* Enlarge the buffer.  */
 127         prtbuflen *= 2;
 128         prttmpbuf = __alloca (prtbuflen);
 129       }
 130
 131   sock = RPC_ANYSOCK;
 132   switch (p->p_proto)
 133     {
 134     case IPPROTO_UDP:
 135       tv.tv_sec = 5;
 136       tv.tv_usec = 0;
 137       client = clntudp_create (&sin, prog, vers, tv, &sock);
 138       if (client == NULL)
 139         {
 140           return NULL;
 141         }
 142 #if 0
 143       /* This is not wanted.  This would disable the user from having
 144          a timeout in the clnt_call() call.  Only a call to cnlt_control()
 145          by the user should set the timeout value.  */
 146       tv.tv_sec = 25;
 147       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 148 #endif
 149       break;
 150     case IPPROTO_TCP:
 151       client = clnttcp_create (&sin, prog, vers, &sock, 0, 0);
 152       if (client == NULL)
 153         {
 154           return NULL;
 155         }
 156 #if 0
 157       /* This is not wanted.  This would disable the user from having
 158          a timeout in the clnt_call() call.  Only a call to cnlt_control()
 159          by the user should set the timeout value.  */
 160       tv.tv_sec = 25;
 161       tv.tv_usec = 0;
 162       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 163 #endif
 164       break;
 165     default:
 166       rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 167       rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
 168       return (NULL);
 169     }
 170   return client;
 171 }