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 #include <shlib-compat.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 protoent protobuf, *p;
  50   size_t prtbuflen;
  51   char *prttmpbuf;
  52   struct sockaddr_in sin;
  53   struct sockaddr_un sun;
  54   int sock;
  55   struct timeval tv;
  56   CLIENT *client;
  57
  58   if (strcmp (proto, "unix") == 0)
  59     {
  60       memset ((char *)&sun, 0, sizeof (sun));
  61       sun.sun_family = AF_UNIX;
  62       strcpy (sun.sun_path, hostname);
  63       sock = RPC_ANYSOCK;
  64       client = clntunix_create (&sun, prog, vers, &sock, 0, 0);
  65       if (client == NULL)
  66         return NULL;
  67 #if 0
  68       /* This is not wanted.  This would disable the user from having
  69          a timeout in the clnt_call() call.  Only a call to cnlt_control()
  70          by the user should set the timeout value.  */
  71       tv.tv_sec = 25;
  72       tv.tv_usec = 0;
  73       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
  74 #endif
  75       return client;
  76     }
  77
  78   if (__libc_rpc_gethostbyname (hostname, &sin) != 0)
  79     return NULL;
  80
  81   prtbuflen = 1024;
  82   prttmpbuf = __alloca (prtbuflen);
  83   while (__getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p) != 0
  84          || p == NULL)
  85     if (errno != ERANGE)
  86       {
  87         struct rpc_createerr *ce = &get_rpc_createerr ();
  88         ce->cf_stat = RPC_UNKNOWNPROTO;
  89         ce->cf_error.re_errno = EPFNOSUPPORT;
  90         return NULL;
  91       }
  92     else
  93       {
  94         /* Enlarge the buffer.  */
  95         prtbuflen *= 2;
  96         prttmpbuf = __alloca (prtbuflen);
  97       }
  98
  99   sock = RPC_ANYSOCK;
 100   switch (p->p_proto)
 101     {
 102     case IPPROTO_UDP:
 103       tv.tv_sec = 5;
 104       tv.tv_usec = 0;
 105       client = clntudp_create (&sin, prog, vers, tv, &sock);
 106       if (client == NULL)
 107         {
 108           return NULL;
 109         }
 110 #if 0
 111       /* This is not wanted.  This would disable the user from having
 112          a timeout in the clnt_call() call.  Only a call to cnlt_control()
 113          by the user should set the timeout value.  */
 114       tv.tv_sec = 25;
 115       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 116 #endif
 117       break;
 118     case IPPROTO_TCP:
 119       client = clnttcp_create (&sin, prog, vers, &sock, 0, 0);
 120       if (client == NULL)
 121         {
 122           return NULL;
 123         }
 124 #if 0
 125       /* This is not wanted.  This would disable the user from having
 126          a timeout in the clnt_call() call.  Only a call to cnlt_control()
 127          by the user should set the timeout value.  */
 128       tv.tv_sec = 25;
 129       tv.tv_usec = 0;
 130       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 131 #endif
 132       break;
 133     default:
 134       {
 135         struct rpc_createerr *ce = &get_rpc_createerr ();
 136         ce->cf_stat = RPC_SYSTEMERROR;
 137         ce->cf_error.re_errno = EPFNOSUPPORT;
 138       }
 139       return (NULL);
 140     }
 141   return client;
 142 }
 143 #ifdef EXPORT_RPC_SYMBOLS
 144 libc_hidden_def (clnt_create)
 145 #else
 146 libc_hidden_nolink_sunrpc (clnt_create, GLIBC_2_0)
 147 #endif