/*

 * 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 <string.h>

#include <rpc/rpc.h>

#include <sys/socket.h>

#include <netdb.h>

#include <shlib-compat.h>

/*

 * Generic client creation: takes (hostname, program-number, protocol) and

 * returns client handle. Default options are set, which the user can

 * change using the rpc equivalent of ioctl()'s.

 */

CLIENT *

clnt_create (const char *hostname, u_long prog, u_long vers,

	     const char *proto)

{

  struct protoent protobuf, *p;

  size_t prtbuflen;

  char *prttmpbuf;

  struct sockaddr_in sin;

  struct sockaddr_un sun;

  int sock;

  struct timeval tv;

  CLIENT *client;

  if (strcmp (proto, "unix") == 0)

    {

      memset ((char *)&sun, 0, sizeof (sun));

      sun.sun_family = AF_UNIX;

      strcpy (sun.sun_path, hostname);

      sock = RPC_ANYSOCK;

      client = clntunix_create (&sun, prog, vers, &sock, 0, 0);

      if (client == NULL)

	return NULL;

#if 0

      /* This is not wanted.  This would disable the user from having

	 a timeout in the clnt_call() call.  Only a call to cnlt_control()

	 by the user should set the timeout value.  */

      tv.tv_sec = 25;

      tv.tv_usec = 0;

      clnt_control (client, CLSET_TIMEOUT, (char *)&tv;;

#endif

      return client;

    }

  if (__libc_rpc_gethostbyname (hostname, &sin) != 0)

    return NULL;

  prtbuflen = 1024;

  prttmpbuf = __alloca (prtbuflen);

  while (__getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p) != 0

	 || p == NULL)

    if (errno != ERANGE)

      {

	struct rpc_createerr *ce = &get_rpc_createerr ();

	ce->cf_stat = RPC_UNKNOWNPROTO;

	ce->cf_error.re_errno = EPFNOSUPPORT;

	return NULL;

      }

    else

      {

	/* Enlarge the buffer.  */

	prtbuflen *= 2;

	prttmpbuf = __alloca (prtbuflen);

      }

  sock = RPC_ANYSOCK;

  switch (p->p_proto)

    {

    case IPPROTO_UDP:

      tv.tv_sec = 5;

      tv.tv_usec = 0;

      client = clntudp_create (&sin, prog, vers, tv, &sock);

      if (client == NULL)

	{

	  return NULL;

	}

#if 0

      /* This is not wanted.  This would disable the user from having

	 a timeout in the clnt_call() call.  Only a call to cnlt_control()

	 by the user should set the timeout value.  */

      tv.tv_sec = 25;

      clnt_control (client, CLSET_TIMEOUT, (char *)&tv;;

#endif

      break;

    case IPPROTO_TCP:

      client = clnttcp_create (&sin, prog, vers, &sock, 0, 0);

      if (client == NULL)

	{

	  return NULL;

	}

#if 0

      /* This is not wanted.  This would disable the user from having

	 a timeout in the clnt_call() call.  Only a call to cnlt_control()

	 by the user should set the timeout value.  */

      tv.tv_sec = 25;

      tv.tv_usec = 0;

      clnt_control (client, CLSET_TIMEOUT, (char *)&tv;;

#endif

      break;

    default:

      {

	struct rpc_createerr *ce = &get_rpc_createerr ();

	ce->cf_stat = RPC_SYSTEMERROR;

	ce->cf_error.re_errno = EPFNOSUPPORT;

      }

      return (NULL);

    }

  return client;

}

#ifdef EXPORT_RPC_SYMBOLS

libc_hidden_def (clnt_create)

#else

libc_hidden_nolink_sunrpc (clnt_create, GLIBC_2_0)

#endif