nuttx/net/uip/uip-listen.c

/****************************************************************************
 * net/uip/uip-listen.c
 *
 *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * A direct leverage of logic from uIP which also has b BSD style license
 *
 *   Author: Adam Dunkels <adam@dunkels.com>
 *   Copyright (c) 2001-2003, Adam Dunkels.
 *   All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>
#ifdef CONFIG_NET

#include <sys/types.h>
#include <net/uip/uipopt.h>

#include "uip-internal.h"

/****************************************************************************
 * Private Data
 ****************************************************************************/

/* The uip_listenports list all currently listening ports. */

static uint16 uip_listenports[UIP_LISTENPORTS];

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Function: uip_listeninit
 *
 * Description:
 *   Setup the listening data structures
 *
 * Assumptions:
 *   Called early in the inialization phase while the system is still
 *   single-threaded.
 *
 ****************************************************************************/

void uip_listeninit(void)
{
  int ndx;
  for (ndx = 0; ndx < UIP_LISTENPORTS; ndx++)
    {
      uip_listenports[ndx] = 0;
    }
}

/****************************************************************************
 * Function: uip_unlisten
 *
 * Description:
 *   Stop listening on a port
 *
 * Assumptions:
 *   Called from normal user code.
 *
 ****************************************************************************/

int uip_unlisten(uint16 port)
{
  irqstate_t flags;
  int ndx;
  int ret = -EINVAL;

  flags = irqsave();
  for (ndx = 0; ndx < UIP_LISTENPORTS; ndx++)
    {
      if (uip_listenports[ndx] == port)
        {
          uip_listenports[ndx] = 0;
          ret = OK;
          break;
        }
    }
  irqrestore(flags);
  return ret;
}

/****************************************************************************
 * Function: uip_listen
 *
 * Description:
 *   Start listening on a port
 *
 * Assumptions:
 *   Called from normal user code.
 *
 ****************************************************************************/

int uip_listen(uint16 port)
{
  irqstate_t flags;
  int ndx;
  int ret = -ENOBUFS;

  flags = irqsave();
  for (ndx = 0; ndx < UIP_LISTENPORTS; ndx++)
    {
      if (uip_listenports[ndx] == 0)
        {
          uip_listenports[ndx] = port;
          ret = OK;
          break;
        }
    }
  irqrestore(flags);
  return ret;
}

/****************************************************************************
 * Function: uip_islistener
 *
 * Description:
 *   Return TRUE is there is a listener for the specified port
 *
 * Assumptions:
 *   Called at interrupt level
 *
 ****************************************************************************/

boolean uip_islistener(uint16 portno)
{
  int ndx;
  for (ndx = 0; ndx < UIP_LISTENPORTS; ndx++)
    {
      if (uip_listenports[ndx] == portno)
        {
          return TRUE;
        }
    }
  return FALSE;
}

/****************************************************************************
 * Function: uip_accept
 *
 * Description:
 *   Accept the new connection for the specified listening port.
 *
 * Assumptions:
 *   Called at interrupt level
 *
 ****************************************************************************/

int uip_accept(struct uip_conn *conn, uint16 portno)
{
  struct uip_conn *listener;
  int ret = ERROR;
  
  /* The interrupt logic has already allocated and initialized a TCP
   * connection -- now check if is an application in place to accept the
   * connection.
   */

  listener = uip_tcplistener(portno);
  if (listener && listener->accept)
    {
      /* Yes.. accept the connection */

      ret = listener->accept(listener->accept_private, conn);
    }
   return ret;
}

#endif /* CONFIG_NET */