// SoftEther VPN Source Code
// Cedar Communication Module
// 
// SoftEther VPN Server, Client and Bridge are free software under GPLv2.
// 
// Copyright (c) 2012-2014 Daiyuu Nobori.
// Copyright (c) 2012-2014 SoftEther VPN Project, University of Tsukuba, Japan.
// Copyright (c) 2012-2014 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
// SOFTWARE OR ITS CONTENTS, AGAINST US (SOFTETHER PROJECT, SOFTETHER
// CORPORATION, DAIYUU NOBORI OR OTHER SUPPLIERS), OR ANY JURIDICAL
// DISPUTES AGAINST US WHICH ARE CAUSED BY ANY KIND OF USING, COPYING,
// MODIFYING, MERGING, PUBLISHING, DISTRIBUTING, SUBLICENSING, AND/OR
// SELLING COPIES OF THIS SOFTWARE SHALL BE REGARDED AS BE CONSTRUED AND
// CONTROLLED BY JAPANESE LAWS, AND YOU MUST FURTHER CONSENT TO
// EXCLUSIVE JURISDICTION AND VENUE IN THE COURTS SITTING IN TOKYO,
// JAPAN. YOU MUST WAIVE ALL DEFENSES OF LACK OF PERSONAL JURISDICTION
// AND FORUM NON CONVENIENS. PROCESS MAY BE SERVED ON EITHER PARTY IN
// THE MANNER AUTHORIZED BY APPLICABLE LAW OR COURT RULE.
// 
// USE ONLY IN JAPAN. DO NOT USE THIS SOFTWARE IN ANOTHER COUNTRY UNLESS
// YOU HAVE A CONFIRMATION THAT THIS SOFTWARE DOES NOT VIOLATE ANY
// CRIMINAL LAWS OR CIVIL RIGHTS IN THAT PARTICULAR COUNTRY. USING THIS
// SOFTWARE IN OTHER COUNTRIES IS COMPLETELY AT YOUR OWN RISK. THE
// SOFTETHER VPN PROJECT HAS DEVELOPED AND DISTRIBUTED THIS SOFTWARE TO
// COMPLY ONLY WITH THE JAPANESE LAWS AND EXISTING CIVIL RIGHTS INCLUDING
// PATENTS WHICH ARE SUBJECTS APPLY IN JAPAN. OTHER COUNTRIES' LAWS OR
// CIVIL RIGHTS ARE NONE OF OUR CONCERNS NOR RESPONSIBILITIES. WE HAVE
// NEVER INVESTIGATED ANY CRIMINAL REGULATIONS, CIVIL LAWS OR
// INTELLECTUAL PROPERTY RIGHTS INCLUDING PATENTS IN ANY OF OTHER 200+
// COUNTRIES AND TERRITORIES. BY NATURE, THERE ARE 200+ REGIONS IN THE
// WORLD, WITH DIFFERENT LAWS. IT IS IMPOSSIBLE TO VERIFY EVERY
// COUNTRIES' LAWS, REGULATIONS AND CIVIL RIGHTS TO MAKE THE SOFTWARE
// COMPLY WITH ALL COUNTRIES' LAWS BY THE PROJECT. EVEN IF YOU WILL BE
// SUED BY A PRIVATE ENTITY OR BE DAMAGED BY A PUBLIC SERVANT IN YOUR
// COUNTRY, THE DEVELOPERS OF THIS SOFTWARE WILL NEVER BE LIABLE TO
// 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.


// Listener.h
// Header of Listener.c

#ifndef	LISTENER_H
#define	LISTENER_H


// Function to call when receiving a new connection
typedef void (NEW_CONNECTION_PROC)(CONNECTION *c);



// Listener structure
struct LISTENER
{
	LOCK *lock;						// Lock
	REF *ref;						// Reference counter
	CEDAR *Cedar;					// Cedar
	UINT Protocol;					// Protocol
	UINT Port;						// Port number
	THREAD *Thread;					// Operating thread
	SOCK *Sock;						// Socket
	EVENT *Event;					// Event
	volatile bool Halt;				// Halting flag
	UINT Status;					// State


	THREAD_PROC *ThreadProc;		// Thread procedure
	void *ThreadParam;				// Thread parameters
	bool LocalOnly;					// Can be connected only from localhost
	bool ShadowIPv6;				// Flag indicating that the shadow IPv6 listener
	LISTENER *ShadowListener;		// Reference to managing shadow IPv6 listener
	bool DisableDos;				// Disable the DoS attack detection
	volatile UINT *NatTGlobalUdpPort;	// NAT-T global UDP port number
	UCHAR RandPortId;				// NAT-T UDP random port ID
	bool EnableConditionalAccept;	// The flag of whether to enable the Conditional Accept
};

// Parameters of TCPAcceptedThread
struct TCP_ACCEPTED_PARAM
{
	LISTENER *r;
	SOCK *s;
};

// UDP entry
struct UDP_ENTRY
{
	UINT SessionKey32;				// 32bit session key
	SESSION *Session;				// Reference to the session
};

// Dynamic listener
struct DYNAMIC_LISTENER
{
	UINT Protocol;					// Protocol
	UINT Port;						// Port
	LOCK *Lock;						// Lock
	CEDAR *Cedar;					// Cedar
	bool *EnablePtr;				// A pointer to the flag of the valid / invalid state
	LISTENER *Listener;				// Listener
};


// Function prototype
LISTENER *NewListener(CEDAR *cedar, UINT proto, UINT port);
LISTENER *NewListenerEx(CEDAR *cedar, UINT proto, UINT port, THREAD_PROC *proc, void *thread_param);
LISTENER *NewListenerEx2(CEDAR *cedar, UINT proto, UINT port, THREAD_PROC *proc, void *thread_param, bool local_only);
LISTENER *NewListenerEx3(CEDAR *cedar, UINT proto, UINT port, THREAD_PROC *proc, void *thread_param, bool local_only, bool shadow_ipv6);
LISTENER *NewListenerEx4(CEDAR *cedar, UINT proto, UINT port, THREAD_PROC *proc, void *thread_param, bool local_only, bool shadow_ipv6,
						 volatile UINT *natt_global_udp_port, UCHAR rand_port_id);
LISTENER *NewListenerEx5(CEDAR *cedar, UINT proto, UINT port, THREAD_PROC *proc, void *thread_param, bool local_only, bool shadow_ipv6,
						 volatile UINT *natt_global_udp_port, UCHAR rand_port_id, bool enable_ca);
void ReleaseListener(LISTENER *r);
void CleanupListener(LISTENER *r);
void ListenerThread(THREAD *thread, void *param);
void ListenerTCPMainLoop(LISTENER *r);
void StopListener(LISTENER *r);
int CompareListener(void *p1, void *p2);
void TCPAccepted(LISTENER *r, SOCK *s);
void EnableDosProtect();
void DisableDosProtect();
void TCPAcceptedThread(THREAD *t, void *param);
void ListenerUDPMainLoop(LISTENER *r);
void UDPReceivedPacket(CEDAR *cedar, SOCK *s, IP *ip, UINT port, void *data, UINT size);
int CompareUDPEntry(void *p1, void *p2);
void CleanupUDPEntry(CEDAR *cedar);
void AddUDPEntry(CEDAR *cedar, SESSION *session);
void DelUDPEntry(CEDAR *cedar, SESSION *session);
SESSION *GetSessionFromUDPEntry(CEDAR *cedar, UINT key32);
UINT GetMaxConnectionsPerIp();
void SetMaxConnectionsPerIp(UINT num);
UINT GetMaxUnestablishedConnections();
void SetMaxUnestablishedConnections(UINT num);
DYNAMIC_LISTENER *NewDynamicListener(CEDAR *c, bool *enable_ptr, UINT protocol, UINT port);
void ApplyDynamicListener(DYNAMIC_LISTENER *d);
void FreeDynamicListener(DYNAMIC_LISTENER *d);
bool ListenerRUDPRpcRecvProc(RUDP_STACK *r, UDPPACKET *p);
void ListenerSetProcRecvRpcEnable(bool b);


#endif	// LISTENER_H



// 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/
