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

/*

 * Copyright (c) 2007 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

 *

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

 */

#include "mac48-address.h"

#include "address.h"

#include "ns3/assert.h"

#include <iomanip>

#include <iostream>

#include <string.h>

namespace ns3 {

ATTRIBUTE_HELPER_CPP (Mac48Address);

#define ASCII_a (0x41)

#define ASCII_z (0x5a)

#define ASCII_A (0x61)

#define ASCII_Z (0x7a)

#define ASCII_COLON (0x3a)

#define ASCII_ZERO (0x30)

static char

AsciiToLowCase (char c)

{

  if (c >= ASCII_a && c <= ASCII_z) {

    return c;

  } else if (c >= ASCII_A && c <= ASCII_Z) {

    return c + (ASCII_a - ASCII_A);

  } else {

    return c;

  }

}

Mac48Address::Mac48Address ()

{

  memset (m_address, 0, 6);

}

Mac48Address::Mac48Address (const char *str)

{

  int i = 0;

  while (*str != 0 && i < 6) 

    {

      uint8_t byte = 0;

      while (*str != ASCII_COLON && *str != 0) 

	{

	  byte <<= 4;

	  char low = AsciiToLowCase (*str);

	  if (low >= ASCII_a) 

	    {

	      byte |= low - ASCII_a + 10;

	    } 

	  else 

	    {

	      byte |= low - ASCII_ZERO;

	    }

	  str++;

	}

      m_address[i] = byte;

      i++;

      if (*str == 0) 

	{

	  break;

	}

      str++;

    }

  NS_ASSERT (i == 6);

}

void 

Mac48Address::CopyFrom (const uint8_t buffer[6])

{

  memcpy (m_address, buffer, 6);

}

void 

Mac48Address::CopyTo (uint8_t buffer[6]) const

{

  memcpy (buffer, m_address, 6);

}

bool 

Mac48Address::IsMatchingType (const Address &address)

{

  return address.CheckCompatible (GetType (), 6);

}

Mac48Address::operator Address () const

{

  return ConvertTo ();

}

Address 

Mac48Address::ConvertTo (void) const

{

  return Address (GetType (), m_address, 6);

}

Mac48Address 

Mac48Address::ConvertFrom (const Address &address)

{

  NS_ASSERT (address.CheckCompatible (GetType (), 6));

  Mac48Address retval;

  address.CopyTo (retval.m_address);

  return retval;

}

Mac48Address 

Mac48Address::Allocate (void)

{

  static uint64_t id = 0;

  id++;

  Mac48Address address;

  address.m_address[0] = (id >> 40) & 0xff;

  address.m_address[1] = (id >> 32) & 0xff;

  address.m_address[2] = (id >> 24) & 0xff;

  address.m_address[3] = (id >> 16) & 0xff;

  address.m_address[4] = (id >> 8) & 0xff;

  address.m_address[5] = (id >> 0) & 0xff;

  return address;

}

uint8_t 

Mac48Address::GetType (void)

{

  static uint8_t type = Address::Register ();

  return type;

}

bool

Mac48Address::IsBroadcast (void) const

{

  return *this == GetBroadcast ();

}

bool 

Mac48Address::IsGroup (void) const

{

  return (m_address[0] & 0x01) == 0x01;

}

Mac48Address

Mac48Address::GetBroadcast (void)

{

  static Mac48Address broadcast = Mac48Address ("ff:ff:ff:ff:ff:ff");

  return broadcast;

}

Mac48Address 

Mac48Address::GetMulticastPrefix (void)

{

  static Mac48Address multicast = Mac48Address ("01:00:5e:00:00:00");

  return multicast;

}

Mac48Address

Mac48Address::GetMulticast6Prefix (void)

{

  static Mac48Address multicast = Mac48Address ("33:33:00:00:00:00");

  return multicast;

}

Mac48Address 

Mac48Address::GetMulticast (Ipv4Address multicastGroup)

{

  Mac48Address etherAddr = Mac48Address::GetMulticastPrefix ();

  //

  // We now have the multicast address in an abstract 48-bit container.  We 

  // need to pull it out so we can play with it.  When we're done, we have the 

  // high order bits in etherBuffer[0], etc.

  //

  uint8_t etherBuffer[6];

  etherAddr.CopyTo (etherBuffer);

  //

  // Now we need to pull the raw bits out of the Ipv4 destination address.

  //

  uint8_t ipBuffer[4];

  multicastGroup.Serialize (ipBuffer);

  //

  // RFC 1112 says that an Ipv4 host group address is mapped to an EUI-48

  // multicast address by placing the low-order 23-bits of the IP address into 

  // the low-order 23 bits of the Ethernet multicast address 

  // 01-00-5E-00-00-00 (hex). 

  //

  etherBuffer[3] |= ipBuffer[1] & 0x7f;

  etherBuffer[4] = ipBuffer[2];

  etherBuffer[5] = ipBuffer[3];

  //

  // Now, etherBuffer has the desired ethernet multicast address.  We have to

  // suck these bits back into the Mac48Address,

  //

  Mac48Address result;

  result.CopyFrom (etherBuffer);

  return result;

}

Mac48Address Mac48Address::GetMulticast(Ipv6Address addr)

{

  Mac48Address etherAddr = Mac48Address::GetMulticast6Prefix();

  uint8_t etherBuffer[6];

  uint8_t ipBuffer[16];

  /* a MAC multicast IPv6 address is like 33:33 and the four low bytes */

  /* for 2001:db8::2fff:fe11:ac10 => 33:33:FE:11:AC:10 */

  etherAddr.CopyTo (etherBuffer);

  addr.Serialize (ipBuffer);

  etherBuffer[2] = ipBuffer[12];

  etherBuffer[3] = ipBuffer[13];

  etherBuffer[4] = ipBuffer[14];

  etherBuffer[5] = ipBuffer[15];

  etherAddr.CopyFrom (etherBuffer);

  return etherAddr;

}

bool operator == (const Mac48Address &a, const Mac48Address &b)

{

  return memcmp (a.m_address, b.m_address, 6) == 0;

}

bool operator != (const Mac48Address &a, const Mac48Address &b)

{

  return ! (a == b);

}

bool operator < (const Mac48Address &a, const Mac48Address &b)

{

  uint8_t aP[6];

  uint8_t bP[6];

  a.CopyTo (aP);

  b.CopyTo (bP);

  for (uint8_t i = 0; i < 6; i++) 

    {

       if (a.m_address[i] < b.m_address[i]) 

        {

          return true;

        } 

       else if (a.m_address[i] > b.m_address[i]) 

        {

          return false;

        }

    }

  return false;

}

std::ostream& operator<< (std::ostream& os, const Mac48Address & address)

{

  uint8_t ad[6];

  address.CopyTo (ad);

  os.setf (std::ios::hex, std::ios::basefield);

  os.fill('0');

  for (uint8_t i=0; i < 5; i++) 

    {

      os << std::setw(2) << (uint32_t)ad[i] << ":";

    }

  // Final byte not suffixed by ":"

  os << std::setw(2) << (uint32_t)ad[5];

  os.setf (std::ios::dec, std::ios::basefield);

  os.fill(' ');

  return os;

}

static uint8_t

AsInt (std::string v)

{

  std::istringstream iss;

  iss.str (v);

  uint32_t retval;

  iss >> std::hex >> retval >> std::dec;

  return retval;

}

std::istream& operator>> (std::istream& is, Mac48Address & address)

{

  std::string v;

  is >> v;

  std::string::size_type col = 0;

  for (uint8_t i = 0; i < 6; ++i)

    {

      std::string tmp;

      std::string::size_type next;

      next = v.find (":", col);

      if (next == std::string::npos)

	{

	  tmp = v.substr (col, v.size ()-col);

	  address.m_address[i] = AsInt (tmp);

	  break;

	}

      else

	{

	  tmp = v.substr (col, next-col);

	  address.m_address[i] = AsInt (tmp);

	  col = next + 1;

	}

    }

  return is;

}

} // namespace ns3