// SoftEther VPN Source Code
// Cedar Communication Module
// 
// SoftEther VPN Server, Client and Bridge are free software under GPLv2.
// 
// Copyright (c) 2012-2016 Daiyuu Nobori.
// Copyright (c) 2012-2016 SoftEther VPN Project, University of Tsukuba, Japan.
// Copyright (c) 2012-2016 SoftEther Corporation.
// 
// All Rights Reserved.
// 
// http://www.softether.org/
// 
// Author: Daiyuu Nobori
// Comments: Tetsuo Sugiyama, Ph.D.
// 
// 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 version 2
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// 
// THE LICENSE AGREEMENT IS ATTACHED ON THE SOURCE-CODE PACKAGE
// AS "LICENSE.TXT" FILE. READ THE TEXT FILE IN ADVANCE TO USE THE SOFTWARE.
// 
// 
// THIS SOFTWARE IS DEVELOPED IN JAPAN, AND DISTRIBUTED FROM JAPAN,
// UNDER JAPANESE LAWS. YOU MUST AGREE IN ADVANCE TO USE, COPY, MODIFY,
// MERGE, PUBLISH, DISTRIBUTE, SUBLICENSE, AND/OR SELL COPIES OF THIS
// SOFTWARE, THAT ANY JURIDICAL DISPUTES WHICH ARE CONCERNED TO THIS
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// USE ONLY IN JAPAN. DO NOT USE THIS SOFTWARE IN ANOTHER COUNTRY UNLESS
// YOU HAVE A CONFIRMATION THAT THIS SOFTWARE DOES NOT VIOLATE ANY
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// SOFTETHER VPN PROJECT HAS DEVELOPED AND DISTRIBUTED THIS SOFTWARE TO
// COMPLY ONLY WITH THE JAPANESE LAWS AND EXISTING CIVIL RIGHTS INCLUDING
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// SUED BY A PRIVATE ENTITY OR BE DAMAGED BY A PUBLIC SERVANT IN YOUR
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// RECOVER OR COMPENSATE SUCH DAMAGES, CRIMINAL OR CIVIL
// RESPONSIBILITIES. NOTE THAT THIS LINE IS NOT LICENSE RESTRICTION BUT
// JUST A STATEMENT FOR WARNING AND DISCLAIMER.
// 
// 
// SOURCE CODE CONTRIBUTION
// ------------------------
// 
// Your contribution to SoftEther VPN Project is much appreciated.
// Please send patches to us through GitHub.
// Read the SoftEther VPN Patch Acceptance Policy in advance:
// http://www.softether.org/5-download/src/9.patch
// 
// 
// DEAR SECURITY EXPERTS
// ---------------------
// 
// If you find a bug or a security vulnerability please kindly inform us
// about the problem immediately so that we can fix the security problem
// to protect a lot of users around the world as soon as possible.
// 
// Our e-mail address for security reports is:
// softether-vpn-security [at] softether.org
// 
// Please note that the above e-mail address is not a technical support
// inquiry address. If you need technical assistance, please visit
// http://www.softether.org/ and ask your question on the users forum.
// 
// Thank you for your cooperation.
// 
// 
// NO MEMORY OR RESOURCE LEAKS
// ---------------------------
// 
// The memory-leaks and resource-leaks verification under the stress
// test has been passed before release this source code.


// NullLan.c
// Virtual LAN card device driver for testing

#include "CedarPch.h"

static UCHAR null_lan_broadcast_address[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};

// Get the packet adapter
PACKET_ADAPTER *NullGetPacketAdapter()
{
	PACKET_ADAPTER *pa = NewPacketAdapter(NullPaInit, NullPaGetCancel, NullPaGetNextPacket,
		NullPaPutPacket, NullPaFree);

	return pa;
}

// Generate MAC address
void NullGenerateMacAddress(UCHAR *mac, UINT id, UINT seq)
{
	UCHAR hash[SHA1_SIZE];
	char name[MAX_SIZE];
	BUF *b;
	// Validate arguments
	if (mac == NULL)
	{
		return;
	}

	b = NewBuf();
	WriteBufInt(b, id);
	WriteBufInt(b, seq);
	GetMachineHostName(name, sizeof(name));
#ifdef	OS_WIN32
	WriteBufInt(b, MsGetCurrentProcessId());
#endif	// OS_WIN32
	WriteBufStr(b, name);

	HashSha1(hash, b->Buf, b->Size);

	FreeBuf(b);

	Copy(mac, hash, 6);
	mac[0] = 0x7E;
}

// Packet generation thread
void NullPacketGenerateThread(THREAD *t, void *param)
{
	NULL_LAN *n = (NULL_LAN *)param;
	UINT64 end_tick = Tick64() + (UINT64)(60 * 1000);
	UINT seq = 0;
	// Validate arguments
	if (t == NULL || param == NULL)
	{
		return;
	}

	while (true)
	{
		/*if (Tick64() >= end_tick)
		{
			break;
		}*/

		Wait(n->Event, Rand32() % 1500);
		if (n->Halt)
		{
			break;
		}

		LockQueue(n->PacketQueue);
		{
			UCHAR *data;
			BLOCK *b;
			UINT size = Rand32() % 1500 + 14;
			UCHAR dst_mac[6];

			NullGenerateMacAddress(n->MacAddr, n->Id, seq);

			//NullGenerateMacAddress(dst_mac, n->Id + 1, 0);
			//StrToMac(dst_mac, "00-1B-21-A9-47-E6");
			StrToMac(dst_mac, "00-AC-7A-EF-83-FD");

			data = Malloc(size);
			Copy(data, null_lan_broadcast_address, 6);
			//Copy(data, dst_mac, 6);
			Copy(data + 6, n->MacAddr, 6);
			b = NewBlock(data, size, 0);
			InsertQueue(n->PacketQueue, b);
		}
		UnlockQueue(n->PacketQueue);
		Cancel(n->Cancel);

		//seq++;
	}
}

// Initialize the packet adapter
bool NullPaInit(SESSION *s)
{
	NULL_LAN *n;
	static UINT id_seed = 0;
	// Validate arguments
	if (s == NULL)
	{
		return false;
	}

	id_seed++;

	n = ZeroMalloc(sizeof(NULL_LAN));
	n->Id = id_seed;
	s->PacketAdapter->Param = (void *)n;

	n->Cancel = NewCancel();
	n->PacketQueue = NewQueue();
	n->Event = NewEvent();

	NullGenerateMacAddress(n->MacAddr, n->Id, 0);

	n->PacketGeneratorThread = NewThread(NullPacketGenerateThread, n);

	return true;
}

// Get the cancel object
CANCEL *NullPaGetCancel(SESSION *s)
{
	// Validate arguments
	NULL_LAN *n;
	if (s == NULL || (n = s->PacketAdapter->Param) == NULL)
	{
		return NULL;
	}

	AddRef(n->Cancel->ref);

	return n->Cancel;
}

// Get the next packet
UINT NullPaGetNextPacket(SESSION *s, void **data)
{
	UINT size = 0;
	// Validate arguments
	NULL_LAN *n;
	if (s == NULL || (n = s->PacketAdapter->Param) == NULL)
	{
		return INFINITE;
	}

	LockQueue(n->PacketQueue);
	{
		BLOCK *b = GetNext(n->PacketQueue);

		if (b != NULL)
		{
			*data = b->Buf;
			size = b->Size;
			Free(b);
		}
	}
	UnlockQueue(n->PacketQueue);

	return size;
}

// Write the packet
bool NullPaPutPacket(SESSION *s, void *data, UINT size)
{
	// Validate arguments
	if (s == NULL)
	{
		return false;
	}
	if (data == NULL)
	{
		return true;
	}

	// Packet ignored
	Free(data);

	return true;
}

// Release
void NullPaFree(SESSION *s)
{
	// Validate arguments
	NULL_LAN *n;
	BLOCK *b;
	if (s == NULL || (n = s->PacketAdapter->Param) == NULL)
	{
		return;
	}

	n->Halt = true;
	Set(n->Event);

	WaitThread(n->PacketGeneratorThread, INFINITE);
	ReleaseThread(n->PacketGeneratorThread);

	LockQueue(n->PacketQueue);
	{
		while (b = GetNext(n->PacketQueue))
		{
			FreeBlock(b);
		}
	}
	UnlockQueue(n->PacketQueue);

	ReleaseQueue(n->PacketQueue);

	ReleaseCancel(n->Cancel);

	ReleaseEvent(n->Event);

	s->PacketAdapter->Param = NULL;
	Free(n);
}



// Developed by SoftEther VPN Project at University of Tsukuba in Japan.
// Department of Computer Science has dozens of overly-enthusiastic geeks.
// Join us: http://www.tsukuba.ac.jp/english/admission/