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       if (__sockaddr_un_set (&sun, hostname) < 0)
  61         {
  62           struct rpc_createerr *ce = &get_rpc_createerr ();
  63           ce->cf_stat = RPC_SYSTEMERROR;
  64           ce->cf_error.re_errno = errno;
  65           return NULL;
  66         }
  67       sock = RPC_ANYSOCK;
  68       client = 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   if (__libc_rpc_gethostbyname (hostname, &sin) != 0)
  83     return NULL;
  84
  85   prtbuflen = 1024;
  86   prttmpbuf = __alloca (prtbuflen);
  87   while (__getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p) != 0
  88          || p == NULL)
  89     if (errno != ERANGE)
  90       {
  91         struct rpc_createerr *ce = &get_rpc_createerr ();
  92         ce->cf_stat = RPC_UNKNOWNPROTO;
  93         ce->cf_error.re_errno = EPFNOSUPPORT;
  94         return NULL;
  95       }
  96     else
  97       {
  98         /* Enlarge the buffer.  */
  99         prtbuflen *= 2;
 100         prttmpbuf = __alloca (prtbuflen);
 101       }
 102
 103   sock = RPC_ANYSOCK;
 104   switch (p->p_proto)
 105     {
 106     case IPPROTO_UDP:
 107       tv.tv_sec = 5;
 108       tv.tv_usec = 0;
 109       client = clntudp_create (&sin, prog, vers, tv, &sock);
 110       if (client == NULL)
 111         {
 112           return NULL;
 113         }
 114 #if 0
 115       /* This is not wanted.  This would disable the user from having
 116          a timeout in the clnt_call() call.  Only a call to cnlt_control()
 117          by the user should set the timeout value.  */
 118       tv.tv_sec = 25;
 119       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 120 #endif
 121       break;
 122     case IPPROTO_TCP:
 123       client = clnttcp_create (&sin, prog, vers, &sock, 0, 0);
 124       if (client == NULL)
 125         {
 126           return NULL;
 127         }
 128 #if 0
 129       /* This is not wanted.  This would disable the user from having
 130          a timeout in the clnt_call() call.  Only a call to cnlt_control()
 131          by the user should set the timeout value.  */
 132       tv.tv_sec = 25;
 133       tv.tv_usec = 0;
 134       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 135 #endif
 136       break;
 137     default:
 138       {
 139         struct rpc_createerr *ce = &get_rpc_createerr ();
 140         ce->cf_stat = RPC_SYSTEMERROR;
 141         ce->cf_error.re_errno = EPFNOSUPPORT;
 142       }
 143       return (NULL);
 144     }
 145   return client;
 146 }
 147 #ifdef EXPORT_RPC_SYMBOLS
 148 libc_hidden_def (clnt_create)
 149 #else
 150 libc_hidden_nolink_sunrpc (clnt_create, GLIBC_2_0)
 151 #endif