clnt_generic.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 #define __FORCE_GLIBC
  34 #include <features.h>
  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 <netdb.h>
  42
  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       memset ((char *)&sun, 0, 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 #if 0
  76       /* This is not wanted.  This would disable the user from having
  77          a timeout in the clnt_call() call.  Only a call to cnlt_control()
  78          by the user should set the timeout value.  */
  79       tv.tv_sec = 25;
  80       tv.tv_usec = 0;
  81       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
  82 #endif
  83       return client;
  84     }
  85
  86   hstbuflen = 1024;
  87   hsttmpbuf = alloca (hstbuflen);
  88   while (gethostbyname_r (hostname, &hostbuf, hsttmpbuf, hstbuflen,
  89                             &h, &herr) != 0
  90          || h == NULL)
  91     if (herr != NETDB_INTERNAL || errno != ERANGE)
  92       {
  93         get_rpc_createerr().cf_stat = RPC_UNKNOWNHOST;
  94         return NULL;
  95       }
  96     else
  97       {
  98         /* Enlarge the buffer.  */
  99         hstbuflen *= 2;
 100         hsttmpbuf = alloca (hstbuflen);
 101       }
 102
 103   if (h->h_addrtype != AF_INET)
 104     {
 105       /*
 106        * Only support INET for now
 107        */
 108       struct rpc_createerr *ce = &get_rpc_createerr ();
 109       ce->cf_stat = RPC_SYSTEMERROR;
 110       ce->cf_error.re_errno = EAFNOSUPPORT;
 111       return NULL;
 112     }
 113   sin.sin_family = h->h_addrtype;
 114   sin.sin_port = 0;
 115   memset (sin.sin_zero, 0, sizeof (sin.sin_zero));
 116   memcpy ((char *) &sin.sin_addr, h->h_addr, h->h_length);
 117
 118   prtbuflen = 1024;
 119   prttmpbuf = alloca (prtbuflen);
 120   while (getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p) != 0
 121          || p == NULL)
 122         if (errno != ERANGE)
 123       {
 124         struct rpc_createerr *ce = &get_rpc_createerr ();
 125         ce->cf_stat = RPC_UNKNOWNPROTO;
 126         ce->cf_error.re_errno = EPFNOSUPPORT;
 127         return NULL;
 128       }
 129     else
 130       {
 131         /* Enlarge the buffer.  */
 132         prtbuflen *= 2;
 133         prttmpbuf = alloca (prtbuflen);
 134       }
 135
 136   sock = RPC_ANYSOCK;
 137   switch (p->p_proto)
 138     {
 139     case IPPROTO_UDP:
 140       tv.tv_sec = 5;
 141       tv.tv_usec = 0;
 142       client = clntudp_create (&sin, prog, vers, tv, &sock);
 143       if (client == NULL)
 144         {
 145           return NULL;
 146         }
 147 #if 0
 148       /* This is not wanted.  This would disable the user from having
 149          a timeout in the clnt_call() call.  Only a call to cnlt_control()
 150          by the user should set the timeout value.  */
 151       tv.tv_sec = 25;
 152       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 153 #endif
 154       break;
 155     case IPPROTO_TCP:
 156       client = clnttcp_create (&sin, prog, vers, &sock, 0, 0);
 157       if (client == NULL)
 158         {
 159           return NULL;
 160         }
 161 #if 0
 162       /* This is not wanted.  This would disable the user from having
 163          a timeout in the clnt_call() call.  Only a call to cnlt_control()
 164          by the user should set the timeout value.  */
 165       tv.tv_sec = 25;
 166       tv.tv_usec = 0;
 167       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 168 #endif
 169       break;
 170     default:
 171       {
 172         struct rpc_createerr *ce = &get_rpc_createerr ();
 173         ce->cf_stat = RPC_SYSTEMERROR;
 174         ce->cf_error.re_errno = EPFNOSUPPORT;
 175       }
 176       return (NULL);
 177     }
 178   return client;
 179 }