// 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 IT IN OTHER COUNTRIES. IMPORTING THIS
// SOFTWARE INTO OTHER COUNTRIES IS AT YOUR OWN RISK. SOME COUNTRIES
// PROHIBIT ENCRYPTED COMMUNICATIONS. USING THIS SOFTWARE IN OTHER
// COUNTRIES MIGHT BE RESTRICTED.
// 
// 
// 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.


// IPsec_IPC.h
// Header of IPsec_IPC.c

#ifndef	IPSEC_IPC
#define	IPSEC_IPC

// Constants
#define	IPC_ARP_LIFETIME				(3 * 60 * 1000)
#define	IPC_ARP_GIVEUPTIME				(1 * 1000)
#define	IPC_DHCP_TIMEOUT				(5 * 1000)
#define	IPC_DHCP_TIMEOUT_TOTAL_GIVEUP	(20 * 1000)
#define	IPC_DHCP_MIN_LEASE				5
#define	IPC_DHCP_DEFAULT_LEASE			3600

#define	IPC_MAX_PACKET_QUEUE_LEN		10000

#define	IPC_DHCP_VENDOR_ID				"MSFT 5.0"

#define	IPC_PASSWORD_MSCHAPV2_TAG		"xH7DiNlurDhcYV4a:"

// ARP table entry
struct IPC_ARP
{
	IP Ip;								// IP address
	bool Resolved;						// Whether the MAC address have been resolved
	UCHAR MacAddress[6];				// MAC address
	UINT64 GiveupTime;					// Time to give up (in the case of unresolved)
	UINT64 ExpireTime;					// Expiration date (If resolved)
	QUEUE *PacketQueue;					// Transmission packet queue
};

// DHCP release queue
struct IPC_DHCP_RELESAE_QUEUE
{
	DHCP_OPTION_LIST Req;
	UINT TranId;
	UCHAR MacAddress[6];
};

// IPC_PARAM
struct IPC_PARAM
{
	char ClientName[MAX_SIZE];
	char Postfix[MAX_SIZE];
	char HubName[MAX_HUBNAME_LEN + 1];
	char UserName[MAX_USERNAME_LEN + 1];
	char Password[MAX_PASSWORD_LEN + 1];
	IP ClientIp;
	UINT ClientPort;
	IP ServerIp;
	UINT ServerPort;
	char ClientHostname[MAX_SIZE];
	char CryptName[MAX_SIZE];
	bool BridgeMode;
	UINT Mss;
	bool IsL3Mode;
	bool IsOpenVPN;
};

// IPC_ASYNC object
struct IPC_ASYNC
{
	CEDAR *Cedar;						// Cedar
	IPC_PARAM Param;					// Parameters for creating IPC
	THREAD *Thread;						// Thread
	SOCK_EVENT *SockEvent;				// Socket events that is set when the connection is completed
	bool Done;							// Processing completion flag
	IPC *Ipc;							// IPC object (if it fails to connect, the value is NULL)
	TUBE *TubeForDisconnect;			// Tube for disconnection notification
	UINT ErrorCode;						// Error code in the case of failing to connect
	DHCP_OPTION_LIST L3ClientAddressOption;	// Client IP address option (Only in the case of L3 mode)
	UINT64 L3DhcpRenewInterval;			// DHCP update interval
	UINT64 L3NextDhcpRenewTick;			// DHCP renewal time of the next
	bool DhcpAllocFailed;				// Failed to get IP address from the DHCP server
};

// IPC object
struct IPC
{
	CEDAR *Cedar;
	char HubName[MAX_HUBNAME_LEN + 1];
	char UserName[MAX_USERNAME_LEN + 1];
	char Password[MAX_PASSWORD_LEN + 1];
	char ClientHostname[MAX_SIZE];
	UCHAR random[SHA1_SIZE];
	char SessionName[MAX_SESSION_NAME_LEN + 1];
	char ConnectionName[MAX_CONNECTION_NAME_LEN + 1];
	POLICY *Policy;
	SOCK *Sock;
	INTERRUPT_MANAGER *Interrupt;		// Interrupt manager
	IP ClientIPAddress;					// IP address of the client
	IP SubnetMask;						// Subnet mask of the client
	IP DefaultGateway;					// Default gateway address
	IP BroadcastAddress;				// Broadcast address
	UCHAR MacAddress[6];				// MAC address
	UCHAR Padding[2];
	LIST *ArpTable;						// ARP table
	QUEUE *IPv4RecviedQueue;			// IPv4 reception queue
	TUBE_FLUSH_LIST *FlushList;			// Tube Flush List
	UCHAR MsChapV2_ServerResponse[20];	// Server response
};

// MS-CHAPv2 authentication information
struct IPC_MSCHAP_V2_AUTHINFO
{
	char MsChapV2_PPPUsername[MAX_SIZE];	// MS-CHAPv2 Username
	UCHAR MsChapV2_ServerChallenge[16];	// MS-CHAPv2 Server Challenge
	UCHAR MsChapV2_ClientChallenge[16];	// MS-CHAPv2 Client Challenge
	UCHAR MsChapV2_ClientResponse[24];	// MS-CHAPv2 Client Response
};

IPC *NewIPC(CEDAR *cedar, char *client_name, char *postfix, char *hubname, char *username, char *password,
			UINT *error_code, IP *client_ip, UINT client_port, IP *server_ip, UINT server_port,
			char *client_hostname, char *crypt_name,
			bool bridge_mode, UINT mss);
IPC *NewIPCByParam(CEDAR *cedar, IPC_PARAM *param, UINT *error_code);
IPC *NewIPCBySock(CEDAR *cedar, SOCK *s, void *mac_address);
void FreeIPC(IPC *ipc);
bool IsIPCConnected(IPC *ipc);
void IPCSetSockEventWhenRecvL2Packet(IPC *ipc, SOCK_EVENT *e);
void IPCSendL2(IPC *ipc, void *data, UINT size);
void IPCSendIPv4(IPC *ipc, void *data, UINT size);
BLOCK *IPCRecvL2(IPC *ipc);
BLOCK *IPCRecvIPv4(IPC *ipc);
void IPCProcessInterrupts(IPC *ipc);
void IPCProcessL3Events(IPC *ipc);
void IPCProcessL3EventsEx(IPC *ipc, UINT64 now);
bool IPCSetIPv4Parameters(IPC *ipc, IP *ip, IP *subnet, IP *gw);
IPC_ARP *IPCNewARP(IP *ip, UCHAR *mac_address);
void IPCFreeARP(IPC_ARP *a);
int IPCCmpArpTable(void *p1, void *p2);
void IPCSendIPv4Unicast(IPC *ipc, void *data, UINT size, IP *next_ip);
IPC_ARP *IPCSearchArpTable(IPC *ipc, IP *ip);
void IPCSendIPv4WithDestMacAddr(IPC *ipc, void *data, UINT size, UCHAR *dest_mac_addr);
void IPCFlushArpTable(IPC *ipc);
void IPCFlushArpTableEx(IPC *ipc, UINT64 now);
void IPCProcessArp(IPC *ipc, BLOCK *b);
void IPCAssociateOnArpTable(IPC *ipc, IP *ip, UCHAR *mac_address);
bool IsValidUnicastMacAddress(UCHAR *mac);
bool IsValidUnicastIPAddress4(IP *ip);
bool IsValidUnicastIPAddressUINT4(UINT ip);
DHCPV4_DATA *IPCSendDhcpRequest(IPC *ipc, IP *dest_ip, UINT tran_id, DHCP_OPTION_LIST *opt, UINT expecting_code, UINT timeout, TUBE *discon_poll_tube);
BUF *IPCBuildDhcpRequest(IPC *ipc, IP *dest_ip, UINT tran_id, DHCP_OPTION_LIST *opt);
BUF *IPCBuildDhcpRequestOptions(IPC *ipc, DHCP_OPTION_LIST *opt);
bool IPCDhcpAllocateIP(IPC *ipc, DHCP_OPTION_LIST *opt, TUBE *discon_poll_tube);
bool IPCDhcpAllocateIPEx(IPC *ipc, DHCP_OPTION_LIST *opt, TUBE *discon_poll_tube, bool openvpn_compatible);
bool IPCDhcpRequestInformIP(IPC *ipc, DHCP_OPTION_LIST *opt, TUBE *discon_poll_tube, IP *client_ip);
void IPCDhcpRenewIP(IPC *ipc, IP *dhcp_server);
void IPCDhcpFreeIP(IPC *ipc, IP *dhcp_server);
IPC_ASYNC *NewIPCAsync(CEDAR *cedar, IPC_PARAM *param, SOCK_EVENT *sock_event);
void IPCAsyncThreadProc(THREAD *thread, void *param);
void FreeIPCAsync(IPC_ASYNC *a);

bool ParseAndExtractMsChapV2InfoFromPassword(IPC_MSCHAP_V2_AUTHINFO *d, char *password);

#endif	// IPSEC_IPC




// 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/
