// SoftEther VPN Source Code - Stable Edition Repository
// Cedar Communication Module
// 
// SoftEther VPN Server, Client and Bridge are free software under the Apache License, Version 2.0.
// 
// Copyright (c) Daiyuu Nobori.
// Copyright (c) SoftEther VPN Project, University of Tsukuba, Japan.
// Copyright (c) SoftEther Corporation.
Copyright (c) all contributors on SoftEther VPN project in GitHub.
// 
// All Rights Reserved.
// 
// http://www.softether.org/
// 
// This stable branch is officially managed by Daiyuu Nobori, the owner of SoftEther VPN Project.
// Pull requests should be sent to the Developer Edition Master Repository on https://github.com/SoftEtherVPN/SoftEtherVPN
// 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.


// IPsec.h
// Header of IPsec.c

#ifndef	IPSEC_H
#define	IPSEC_H

//// Constants

// UDP port number
#define	IPSEC_PORT_L2TP					1701		// L2TP
#define	IPSEC_PORT_IPSEC_ISAKMP			500			// ISAKMP
#define	IPSEC_PORT_IPSEC_ESP_UDP		4500		// IPsec ESP over UDP
#define	IPSEC_PORT_IPSEC_ESP_RAW		MAKE_SPECIAL_PORT(50)	// Raw mode ESP Protocol No: 50
#define	IPSEC_PORT_IPSEC_ESP_RAW_WPF	MAKE_SPECIAL_PORT(52)	// Raw mode ESP Protocol No: 52 (WPF)
#define	IPSEC_PORT_L2TPV3_VIRTUAL		1000001		// L2TPv3 virtual port

// IP protocol number
#define	IPSEC_IP_PROTO_ETHERIP			IP_PROTO_ETHERIP	// EtherIP
#define	IPSEC_IP_PROTO_L2TPV3			IP_PROTO_L2TPV3		// L2TPv3

// WFP tag
#define	WFP_ESP_PACKET_TAG_1		0x19841117
#define	WFP_ESP_PACKET_TAG_2		0x1accafe1

// Monitoring interval of OS service
#define	IPSEC_CHECK_OS_SERVICE_INTERVAL_INITIAL	1024
#define	IPSEC_CHECK_OS_SERVICE_INTERVAL_MAX		(5 * 60 * 1000)

// Default IPsec pre-shared key
#define	IPSEC_DEFAULT_SECRET			"vpn"


//// Type

// List of services provided by IPsec server
struct IPSEC_SERVICES
{
	bool L2TP_Raw;								// Raw L2TP
	bool L2TP_IPsec;							// L2TP over IPsec
	bool EtherIP_IPsec;							// EtherIP over IPsec

	char IPsec_Secret[MAX_SIZE];				// IPsec pre-shared key
	char L2TP_DefaultHub[MAX_SIZE];				// Default Virtual HUB name for L2TP connection
};

// EtherIP key list entry
struct ETHERIP_ID
{
	char Id[MAX_SIZE];							// ID
	char HubName[MAX_HUBNAME_LEN + 1];			// Virtual HUB name
	char UserName[MAX_USERNAME_LEN + 1];		// User name
	char Password[MAX_USERNAME_LEN + 1];		// Password
};

// IPsec server
struct IPSEC_SERVER
{
	CEDAR *Cedar;
	UDPLISTENER *UdpListener;
	bool Halt;
	bool NoMoreChangeSettings;
	LOCK *LockSettings;
	IPSEC_SERVICES Services;
	L2TP_SERVER *L2TP;							// L2TP server
	IKE_SERVER *Ike;							// IKE server
	LIST *EtherIPIdList;						// EtherIP setting list
	UINT EtherIPIdListSettingVerNo;				// EtherIP setting list version number
	THREAD *OsServiceCheckThread;				// OS Service monitoring thread
	EVENT *OsServiceCheckThreadEvent;			// Event for OS Service monitoring thread
	IPSEC_WIN7 *Win7;							// Helper module for Windows Vista / 7
	bool Check_LastEnabledStatus;
	bool HostIPAddressListChanged;
	bool OsServiceStoped;
};


//// Function prototype
IPSEC_SERVER *NewIPsecServer(CEDAR *cedar);
void FreeIPsecServer(IPSEC_SERVER *s);
void IPsecServerUdpPacketRecvProc(UDPLISTENER *u, LIST *packet_list);
void IPsecServerSetServices(IPSEC_SERVER *s, IPSEC_SERVICES *sl);
void IPsecNormalizeServiceSetting(IPSEC_SERVER *s);
void IPsecServerGetServices(IPSEC_SERVER *s, IPSEC_SERVICES *sl);
void IPsecProcPacket(IPSEC_SERVER *s, UDPPACKET *p);
int CmpEtherIPId(void *p1, void *p2);
bool SearchEtherIPId(IPSEC_SERVER *s, ETHERIP_ID *id, char *id_str);
void AddEtherIPId(IPSEC_SERVER *s, ETHERIP_ID *id);
bool DeleteEtherIPId(IPSEC_SERVER *s, char *id_str);
void IPsecOsServiceCheckThread(THREAD *t, void *p);
bool IPsecCheckOsService(IPSEC_SERVER *s);
void IPSecSetDisable(bool b);


#endif	// IPSEC_H