// 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
// 
// License: The Apache License, Version 2.0
// https://www.apache.org/licenses/LICENSE-2.0
// 
// DISCLAIMER
// ==========
// 
// 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.
// 
// 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.
// 
// READ AND UNDERSTAND THE 'WARNING.TXT' FILE BEFORE USING THIS SOFTWARE.
// SOME SOFTWARE PROGRAMS FROM THIRD PARTIES ARE INCLUDED ON THIS SOFTWARE WITH
// LICENSE CONDITIONS WHICH ARE DESCRIBED ON THE 'THIRD_PARTY.TXT' FILE.
// 
// 
// 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_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:"

#define IPC_LAYER_2						2
#define IPC_LAYER_3						3

// 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_SESSION_SHARED_BUFFER_DATA
struct IPC_SESSION_SHARED_BUFFER_DATA
{
	char ProtocolDetails[256];		// Protocol Details
	bool EnableUdpAccel;
	bool UsingUdpAccel;
};

// 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;
	X *ClientCertificate;
	UINT Layer;
};

// 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
	DHCP_CLASSLESS_ROUTE_TABLE ClasslessRoute;	// Classless routing table
	SHARED_BUFFER *IpcSessionSharedBuffer;	// A shared buffer between IPC and Session
	IPC_SESSION_SHARED_BUFFER_DATA *IpcSessionShared;	// A shared data between IPC and Session
	UINT Layer;
};

// 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
	EAP_CLIENT *MsChapV2_EapClient;		// EAP client
};

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, EAP_CLIENT *eap_client, X *client_certificate,
			UINT layer);
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, DHCP_CLASSLESS_ROUTE_TABLE *rt);
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