sunrpc/clnt_gen.c

   1 /*
   2  * Copyright (c) 2010, Oracle America, Inc.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  *     * Redistributions of source code must retain the above copyright
   9  *       notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  *       copyright notice, this list of conditions and the following
  12  *       disclaimer in the documentation and/or other materials
  13  *       provided with the distribution.
  14  *     * Neither the name of the "Oracle America, Inc." nor the names of its
  15  *       contributors may be used to endorse or promote products derived
  16  *       from this software without specific prior written permission.
  17  *
  18  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  21  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  22  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  23  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  25  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  27  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <alloca.h>
  33 #include <errno.h>
  34 #include <string.h>
  35 #include <rpc/rpc.h>
  36 #include <sys/socket.h>
  37 #include <netdb.h>
  38
  39 /*
  40  * Generic client creation: takes (hostname, program-number, protocol) and
  41  * returns client handle. Default options are set, which the user can
  42  * change using the rpc equivalent of ioctl()'s.
  43  */
  44 CLIENT *
  45 clnt_create (const char *hostname, u_long prog, u_long vers,
  46              const char *proto)
  47 {
  48   struct hostent hostbuf, *h;
  49   size_t hstbuflen;
  50   char *hsttmpbuf;
  51   struct protoent protobuf, *p;
  52   size_t prtbuflen;
  53   char *prttmpbuf;
  54   struct sockaddr_in sin;
  55   struct sockaddr_un sun;
  56   int sock;
  57   struct timeval tv;
  58   CLIENT *client;
  59   int herr;
  60
  61   if (strcmp (proto, "unix") == 0)
  62     {
  63       __bzero ((char *)&sun, sizeof (sun));
  64       sun.sun_family = AF_UNIX;
  65       strcpy (sun.sun_path, hostname);
  66       sock = RPC_ANYSOCK;
  67       client = clntunix_create (&sun, prog, vers, &sock, 0, 0);
  68       if (client == NULL)
  69         return NULL;
  70 #if 0
  71       /* This is not wanted.  This would disable the user from having
  72          a timeout in the clnt_call() call.  Only a call to cnlt_control()
  73          by the user should set the timeout value.  */
  74       tv.tv_sec = 25;
  75       tv.tv_usec = 0;
  76       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
  77 #endif
  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          || h == NULL)
  86     if (herr != NETDB_INTERNAL || errno != ERANGE)
  87       {
  88         get_rpc_createerr().cf_stat = RPC_UNKNOWNHOST;
  89         return NULL;
  90       }
  91     else
  92       {
  93         /* Enlarge the buffer.  */
  94         hstbuflen *= 2;
  95         hsttmpbuf = __alloca (hstbuflen);
  96       }
  97
  98   if (h->h_addrtype != AF_INET)
  99     {
 100       /*
 101        * Only support INET for now
 102        */
 103       struct rpc_createerr *ce = &get_rpc_createerr ();
 104       ce->cf_stat = RPC_SYSTEMERROR;
 105       ce->cf_error.re_errno = EAFNOSUPPORT;
 106       return NULL;
 107     }
 108   sin.sin_family = h->h_addrtype;
 109   sin.sin_port = 0;
 110   __bzero (sin.sin_zero, sizeof (sin.sin_zero));
 111   memcpy ((char *) &sin.sin_addr, h->h_addr, h->h_length);
 112
 113   prtbuflen = 1024;
 114   prttmpbuf = __alloca (prtbuflen);
 115   while (__getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p) != 0
 116          || p == NULL)
 117     if (errno != ERANGE)
 118       {
 119         struct rpc_createerr *ce = &get_rpc_createerr ();
 120         ce->cf_stat = RPC_UNKNOWNPROTO;
 121         ce->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       {
 167         struct rpc_createerr *ce = &get_rpc_createerr ();
 168         ce->cf_stat = RPC_SYSTEMERROR;
 169         ce->cf_error.re_errno = EPFNOSUPPORT;
 170       }
 171       return (NULL);
 172     }
 173   return client;
 174 }
 175 #ifdef EXPORT_RPC_SYMBOLS
 176 libc_hidden_def (clnt_create)
 177 #else
 178 libc_hidden_nolink (clnt_create, GLIBC_2_0)
 179 #endif