/*

 * clnt_simple.c

 * Simplified front end to rpc.

 *

 * Copyright (c) 2010, Oracle America, Inc.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are

 * met:

 *

 *     * Redistributions of source code must retain the above copyright

 *       notice, this list of conditions and the following disclaimer.

 *     * Redistributions in binary form must reproduce the above

 *       copyright notice, this list of conditions and the following

 *       disclaimer in the documentation and/or other materials

 *       provided with the distribution.

 *     * Neither the name of the "Oracle America, Inc." nor the names of its

 *       contributors may be used to endorse or promote products derived

 *       from this software without specific prior written permission.

 *

 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS

 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

 *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

 *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

 *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include <alloca.h>

#include <errno.h>

#include <stdio.h>

#include <unistd.h>

#include <rpc/rpc.h>

#include <sys/socket.h>

#include <netdb.h>

#include <string.h>

#include <shlib-compat.h>

struct callrpc_private_s

  {

    CLIENT *client;

    int socket;

    u_long oldprognum, oldversnum, valid;

    char *oldhost;

  };

#define callrpc_private RPC_THREAD_VARIABLE(callrpc_private_s)

int

callrpc (const char *host, u_long prognum, u_long versnum, u_long procnum,

	 xdrproc_t inproc, const char *in, xdrproc_t outproc, char *out)

{

  struct callrpc_private_s *crp = callrpc_private;

  struct sockaddr_in server_addr;

  enum clnt_stat clnt_stat;

  struct timeval timeout, tottimeout;

  if (crp == 0)

    {

      crp = (struct callrpc_private_s *) calloc (1, sizeof (*crp));

      if (crp == 0)

	return 0;

      callrpc_private = crp;

    }

  if (crp->oldhost == NULL)

    {

      crp->oldhost = malloc (256);

      crp->oldhost[0] = 0;

      crp->socket = RPC_ANYSOCK;

    }

  if (crp->valid && crp->oldprognum == prognum && crp->oldversnum == versnum

      && strcmp (crp->oldhost, host) == 0)

    {

      /* reuse old client */

    }

  else

    {

      crp->valid = 0;

      if (crp->socket != RPC_ANYSOCK)

	{

	  (void) __close (crp->socket);

	  crp->socket = RPC_ANYSOCK;

	}

      if (crp->client)

	{

	  clnt_destroy (crp->client);

	  crp->client = NULL;

	}

      if (__libc_rpc_gethostbyname (host, &server_addr) != 0)

	return (int) get_rpc_createerr().cf_stat;

      timeout.tv_usec = 0;

      timeout.tv_sec = 5;

      if ((crp->client = clntudp_create (&server_addr, (u_long) prognum,

			  (u_long) versnum, timeout, &crp->socket)) == NULL)

	return (int) get_rpc_createerr().cf_stat;

      crp->valid = 1;

      crp->oldprognum = prognum;

      crp->oldversnum = versnum;

      (void) strncpy (crp->oldhost, host, 255);

      crp->oldhost[255] = '\0';

    }

  tottimeout.tv_sec = 25;

  tottimeout.tv_usec = 0;

  clnt_stat = clnt_call (crp->client, procnum, inproc, (char *) in,

			 outproc, out, tottimeout);

  /*

   * if call failed, empty cache

   */

  if (clnt_stat != RPC_SUCCESS)

    crp->valid = 0;

  return (int) clnt_stat;

}

libc_hidden_nolink_sunrpc (callrpc, GLIBC_2_0)

void

__rpc_thread_clnt_cleanup (void)

{

	struct callrpc_private_s *rcp = RPC_THREAD_VARIABLE(callrpc_private_s);

	if (rcp) {

		if (rcp->client)

			CLNT_DESTROY (rcp->client);

		free (rcp);

	}

}