/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2007 Emmanuelle Laprise, INRIA

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * Authors: Emmanuelle Laprise <emmanuelle.laprise@bluekazoo.ca>

 *          Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#include "packet-socket.h"

#include "packet-socket-address.h"

#include "ns3/log.h"

#include "ns3/node.h"

#include "ns3/packet.h"

NS_LOG_COMPONENT_DEFINE ("PacketSocket");

namespace ns3 {

{

  NS_LOG_FUNCTION;

  NS_LOG_FUNCTION;

  m_state = STATE_OPEN;

  m_shutdownSend = false;

  m_shutdownRecv = false;

  m_errno = ERROR_NOTERROR;

}

PacketSocket::~PacketSocket ()

{

  NS_LOG_FUNCTION;

}

void 

PacketSocket::DoDispose (void)

{

  NS_LOG_FUNCTION;

  m_device = 0;

}

enum Socket::SocketErrno

PacketSocket::GetErrno (void) const

{

  NS_LOG_FUNCTION;

  return m_errno;

}

Ptr<Node>

PacketSocket::GetNode (void) const

{

  NS_LOG_FUNCTION;

  return m_node;

}

int

PacketSocket::Bind (void)

{

  NS_LOG_FUNCTION;

  PacketSocketAddress address;

  address.SetProtocol (0);

  address.SetAllDevices ();

  return DoBind (address);

}

int

PacketSocket::Bind (const Address &address)

{ 

  NS_LOG_FUNCTION;

  if (!PacketSocketAddress::IsMatchingType (address))

    {

      m_errno = ERROR_INVAL;

      return -1;

    }

  PacketSocketAddress ad = PacketSocketAddress::ConvertFrom (address);

  return DoBind (ad);

}

int

PacketSocket::DoBind (const PacketSocketAddress &address)

{

  NS_LOG_FUNCTION;

  if (m_state == STATE_BOUND ||

      m_state == STATE_CONNECTED)

    {

      m_errno = ERROR_INVAL;

      return -1;

    }

  if (m_state == STATE_CLOSED)

    {

      m_errno = ERROR_BADF;

      return -1;

    }

  Ptr<NetDevice> dev ;

  if (address.IsSingleDevice ())

    {

      dev = 0;

    }

  else

    {

      m_node->GetDevice (address.GetSingleDevice ());

    }

  m_node->RegisterProtocolHandler (MakeCallback (&PacketSocket::ForwardUp, this),

                                   address.GetProtocol (), dev);

  m_state = STATE_BOUND;

  m_protocol = address.GetProtocol ();

  m_isSingleDevice = address.IsSingleDevice ();

  m_device = address.GetSingleDevice ();

  return 0;

}

int

PacketSocket::ShutdownSend (void)

{

  NS_LOG_FUNCTION;

  if (m_state == STATE_CLOSED)

    {

      m_errno = ERROR_BADF;

      return -1;

    }

  m_shutdownSend = true;

  return 0;

}

int

PacketSocket::ShutdownRecv (void)

{

  NS_LOG_FUNCTION;

  if (m_state == STATE_CLOSED)

    {

      m_errno = ERROR_BADF;

      return -1;

    }

  m_shutdownRecv = false;

  return 0;

}

int

PacketSocket::Close(void)

{

  NS_LOG_FUNCTION;

  if (m_state == STATE_CLOSED)

    {

      m_errno = ERROR_BADF;

      return -1;

    }

  m_state = STATE_CLOSED;

  NotifyCloseCompleted ();

  return 0;

}

int

PacketSocket::Connect(const Address &ad)

{

  NS_LOG_FUNCTION;

  PacketSocketAddress address;

  if (m_state == STATE_CLOSED)

    {

      m_errno = ERROR_BADF;

      goto error;

    }

  if (m_state == STATE_OPEN)

    {

      // connect should happen _after_ bind.

      m_errno = ERROR_INVAL; // generic error condition.

      goto error;

    }

  if (m_state == STATE_CONNECTED)

    {

      m_errno = ERROR_ISCONN;

      goto error;

    }

  if (!PacketSocketAddress::IsMatchingType (ad))

    {

      m_errno = ERROR_AFNOSUPPORT;

      goto error;

    }

  m_destAddr = ad;

  m_state = STATE_CONNECTED;

  NotifyConnectionSucceeded ();

  return 0;

 error:

  NotifyConnectionFailed ();

  return -1;

}

int

PacketSocket::Send (Ptr<Packet> p)

{

  NS_LOG_FUNCTION;

  if (m_state == STATE_OPEN ||

      m_state == STATE_BOUND)

    {

      m_errno = ERROR_NOTCONN;

      return -1;

    }

  return SendTo (m_destAddr, p);

}

int

PacketSocket::SendTo(const Address &address, Ptr<Packet> p)

{

  NS_LOG_FUNCTION;

  PacketSocketAddress ad;

  if (m_state == STATE_CLOSED)

    {

      NS_LOG_LOGIC ("ERROR_BADF");

      m_errno = ERROR_BADF;

      return -1;

    }

  if (m_state == STATE_OPEN)

    {

      // XXX should return another error here.

      NS_LOG_LOGIC ("ERROR_INVAL");

      m_errno = ERROR_INVAL;

      return -1;

    }

  if (m_shutdownSend)

    {

      NS_LOG_LOGIC ("ERROR_SHUTDOWN");

      m_errno = ERROR_SHUTDOWN;

      return -1;

    }

  if (!PacketSocketAddress::IsMatchingType (address))

    {

      NS_LOG_LOGIC ("ERROR_AFNOSUPPORT");

      m_errno = ERROR_AFNOSUPPORT;

      return -1;

    }

  ad = PacketSocketAddress::ConvertFrom (address);

  bool error = false;

  Address dest = ad.GetPhysicalAddress ();

  if (ad.IsSingleDevice ())

    {

      Ptr<NetDevice> device = m_node->GetDevice (ad.GetSingleDevice ());

      if (!device->Send (p, dest, ad.GetProtocol ()))

        {

          NS_LOG_LOGIC ("error: NetDevice::Send error");

          error = true;

        }

    }

  else

    {

      for (uint32_t i = 0; i < m_node->GetNDevices (); i++)

        {

          Ptr<NetDevice> device = m_node->GetDevice (i);

          if (!device->Send (p, dest, ad.GetProtocol ()))

            {

              NS_LOG_LOGIC ("error: NetDevice::Send error");

              error = true;

            }

        }

    }

  if (!error)

    {

      NotifyDataSent (p->GetSize ());

    }

  if (error)

    {

      NS_LOG_LOGIC ("ERROR_INVAL 2");

      m_errno = ERROR_INVAL;

      return -1;

    }

  else

    {

      return 0;

    }

}

void 

PacketSocket::ForwardUp (Ptr<NetDevice> device, Ptr<Packet> packet, 

                         uint16_t protocol, const Address &from)

{

  NS_LOG_FUNCTION;

  if (m_shutdownRecv)

    {

      return;

    }

  PacketSocketAddress address;

  address.SetPhysicalAddress (from);

  address.SetSingleDevice (device->GetIfIndex ());

  address.SetProtocol (protocol);

  NS_LOG_LOGIC ("UID is " << packet->GetUid() << " PacketSocket " << this);

  NotifyDataReceived (packet, address);

}

}//namespace ns3