// SoftEther VPN Source Code
// Cedar Communication Module
// 
// SoftEther VPN Server, Client and Bridge are free software under GPLv2.
// 
// Copyright (c) Daiyuu Nobori, Ph.D..
// Copyright (c) SoftEther VPN Project, University of Tsukuba, Japan.
// Copyright (c) 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.


// Protocol.h
// Header of Protocol.c

#ifndef	PROTOCOL_H
#define	PROTOCOL_H

// The parameters that will be passed to the certificate confirmation thread
struct CHECK_CERT_THREAD_PROC
{
	CONNECTION *Connection;
	X *ServerX;
	CHECK_CERT_PROC *CheckCertProc;
	bool UserSelected;
	bool Exipred;
	bool Ok;
};

// The parameters that will be passed to the secure device signature thread
struct SECURE_SIGN_THREAD_PROC
{
	SECURE_SIGN_PROC *SecureSignProc;
	CONNECTION *Connection;
	SECURE_SIGN *SecureSign;
	bool UserFinished;
	bool Ok;
};

// Signature sending thread parameters
struct SEND_SIGNATURE_PARAM
{
	char Hostname[MAX_PATH];		// Host name
	UINT Port;						// Port number
	BUF *Buffer;					// Packet contents
};

// Software update client callback
typedef void (UPDATE_NOTIFY_PROC)(UPDATE_CLIENT *c, UINT latest_build, UINT64 latest_date, char *latest_ver, char *url, volatile bool *halt_flag, void *param);
typedef bool (UPDATE_ISFOREGROUND_PROC)(UPDATE_CLIENT *c, void *param);

// Configure the software update client
struct UPDATE_CLIENT_SETTING
{
	bool DisableCheck;				// Disable the update check
	UINT LatestIgnoreBuild;			// Ignore for earlier or identical to this build number
};

// Software update client
struct UPDATE_CLIENT
{
	char FamilyName[MAX_SIZE];		// Product family name
	char SoftwareName[MAX_SIZE];	// Software Name
	wchar_t SoftwareTitle[MAX_SIZE];	// Software display name
	char ClientId[128];				// Client ID
	UINT MyBuild;					// Build number of myself
	UINT64 MyDate;					// Build date of myself
	char MyLanguage[MAX_SIZE];		// My language
	UPDATE_CLIENT_SETTING Setting;	// Setting
	UINT LatestBuild;				// Latest build number that was successfully acquired
	volatile bool HaltFlag;			// Halting flag
	EVENT *HaltEvent;				// Halting event
	void *Param;					// Any parameters
	THREAD *Thread;					// Thread
	UPDATE_NOTIFY_PROC *Callback;	// Callback function
	UPDATE_ISFOREGROUND_PROC *IsForegroundCb;	// Callback function for retrieving whether foreground
};

//// Constant related to updating of the software

// Family
#define	UPDATE_FAMILY_NAME			_SS("PRODUCT_FAMILY_NAME")

// Software update server certificate hash
#define	UPDATE_SERVER_CERT_HASH		DDNS_CERT_HASH

// URL
#define	UPDATE_SERVER_URL_GLOBAL	"https://update-check.softether-network.net/update/update.aspx?family=%s&software=%s&mybuild=%u&lang=%s"
#define	UPDATE_SERVER_URL_CHINA		"https://update-check.uxcom.jp/update/update.aspx?family=%s&software=%s&mybuild=%u&lang=%s"

// Update check interval
#define	UPDATE_CHECK_INTERVAL_MIN		(12 * 3600 * 1000)
#define	UPDATE_CHECK_INTERVAL_MAX		(24 * 7200 * 1000)

// Connection parameters
#define	UPDATE_CONNECT_TIMEOUT			5000
#define	UPDATE_COMM_TIMEOUT				5000

// Dynamic root cert fetch function
#define	CERT_HTTP_DOWNLOAD_MAXSIZE	65536
#define	CERT_HTTP_DOWNLOAD_TIMEOUT	(10 * 1000)
#define	ROOT_CERTS_FILENAME			"|root_certs.dat"
#define	AUTO_DOWNLOAD_CERTS_PREFIX	L".autodownload_"
#define	FIND_CERT_CHAIN_MAX_DEPTH	16

#define	PROTO_SUPPRESS_CLIENT_UPDATE_NOTIFICATION_REGKEY	"Software\\" GC_REG_COMPANY_NAME "\\" CEDAR_PRODUCT_STR " VPN\\Client Update Notification"
#define	PROTO_SUPPRESS_CLIENT_UPDATE_NOTIFICATION_REGVALUE	"Suppress"

// Function prototype
UPDATE_CLIENT *NewUpdateClient(UPDATE_NOTIFY_PROC *cb, UPDATE_ISFOREGROUND_PROC *isforeground_cb, void *param, char *family_name, char *software_name, wchar_t *software_title, UINT my_build, UINT64 my_date, char *my_lang, UPDATE_CLIENT_SETTING *current_setting, char *client_id);
void FreeUpdateClient(UPDATE_CLIENT *c);
void UpdateClientThreadProc(THREAD *thread, void *param);
void UpdateClientThreadMain(UPDATE_CLIENT *c);
void UpdateClientThreadProcessResults(UPDATE_CLIENT *c, BUF *b);
void SetUpdateClientSetting(UPDATE_CLIENT *c, UPDATE_CLIENT_SETTING *s);
UINT64 ShortStrToDate64(char *str);


bool ServerAccept(CONNECTION *c);
bool ClientConnect(CONNECTION *c);
SOCK *ClientConnectToServer(CONNECTION *c);
SOCK *TcpIpConnect(char *hostname, UINT port, bool try_start_ssl, bool ssl_no_tls);
SOCK *TcpIpConnectEx(char *hostname, UINT port, bool *cancel_flag, void *hWnd, UINT *nat_t_error_code, bool no_nat_t, bool try_start_ssl, bool ssl_no_tls, IP *ret_ip);
bool ClientUploadSignature(SOCK *s);
bool ClientDownloadHello(CONNECTION *c, SOCK *s);
bool ServerDownloadSignature(CONNECTION *c, char **error_detail_str);
bool ServerUploadHello(CONNECTION *c);
bool ClientUploadAuth(CONNECTION *c);
SOCK *ClientConnectGetSocket(CONNECTION *c, bool additional_connect, bool no_tls);
SOCK *TcpConnectEx2(char *hostname, UINT port, UINT timeout, bool *cancel_flag, void *hWnd, bool try_start_ssl, bool ssl_no_tls);
SOCK *TcpConnectEx3(char *hostname, UINT port, UINT timeout, bool *cancel_flag, void *hWnd, bool no_nat_t, UINT *nat_t_error_code, bool try_start_ssl, bool ssl_no_tls, IP *ret_ip);

void InitProtocol();
void FreeProtocol();



POLICY *PackGetPolicy(PACK *p);
void PackAddPolicy(PACK *p, POLICY *y);
PACK *PackWelcome(SESSION *s);
PACK *PackHello(void *random, UINT ver, UINT build, char *server_str);
bool GetHello(PACK *p, void *random, UINT *ver, UINT *build, char *server_str, UINT server_str_size);
PACK *PackLoginWithAnonymous(char *hubname, char *username);
PACK *PackLoginWithPassword(char *hubname, char *username, void *secure_password);
PACK *PackLoginWithPlainPassword(char *hubname, char *username, void *plain_password);
PACK *PackLoginWithCert(char *hubname, char *username, X *x, void *sign, UINT sign_size);
bool GetMethodFromPack(PACK *p, char *method, UINT size);
bool GetHubnameAndUsernameFromPack(PACK *p, char *username, UINT username_size,
								   char *hubname, UINT hubname_size);
PACK *PackAdditionalConnect(UCHAR *session_key);
UINT GetAuthTypeFromPack(PACK *p);
UINT GetProtocolFromPack(PACK *p);
bool ParseWelcomeFromPack(PACK *p, char *session_name, UINT session_name_size,
						  char *connection_name, UINT connection_name_size,
						  POLICY **policy);


bool ClientAdditionalConnect(CONNECTION *c, THREAD *t);
SOCK *ClientAdditionalConnectToServer(CONNECTION *c);
bool ClientUploadAuth2(CONNECTION *c, SOCK *s);
bool GetSessionKeyFromPack(PACK *p, UCHAR *session_key, UINT *session_key_32);
void GenerateRC4KeyPair(RC4_KEY_PAIR *k);

SOCK *ProxyConnect(CONNECTION *c, char *proxy_host_name, UINT proxy_port,
				   char *server_host_name, UINT server_port,
				   char *username, char *password, bool additional_connect);
SOCK *ProxyConnectEx(CONNECTION *c, char *proxy_host_name, UINT proxy_port,
					 char *server_host_name, UINT server_port,
					 char *username, char *password, bool additional_connect,
					 bool *cancel_flag, void *hWnd);
SOCK *ProxyConnectEx2(CONNECTION *c, char *proxy_host_name, UINT proxy_port,
					 char *server_host_name, UINT server_port,
					 char *username, char *password, bool additional_connect,
					 bool *cancel_flag, void *hWnd, UINT timeout);
SOCK *SocksConnect(CONNECTION *c, char *proxy_host_name, UINT proxy_port,
				   char *server_host_name, UINT server_port,
				   char *username, bool additional_connect);
SOCK *SocksConnectEx(CONNECTION *c, char *proxy_host_name, UINT proxy_port,
					 char *server_host_name, UINT server_port,
					 char *username, bool additional_connect,
					 bool *cancel_flag, void *hWnd);
SOCK *SocksConnectEx2(CONNECTION *c, char *proxy_host_name, UINT proxy_port,
					 char *server_host_name, UINT server_port,
					 char *username, bool additional_connect,
					 bool *cancel_flag, void *hWnd, UINT timeout, IP *ret_ip);
bool SocksSendRequestPacket(CONNECTION *c, SOCK *s, UINT dest_port, IP *dest_ip, char *userid);
bool SocksRecvResponsePacket(CONNECTION *c, SOCK *s);
void CreateNodeInfo(NODE_INFO *info, CONNECTION *c);
UINT SecureSign(SECURE_SIGN *sign, UINT device_id, char *pin);
void ClientUploadNoop(CONNECTION *c);
bool ClientCheckServerCert(CONNECTION *c, bool *expired);
void ClientCheckServerCertThread(THREAD *thread, void *param);
bool ClientSecureSign(CONNECTION *c, UCHAR *sign, UCHAR *random, X **x);
void ClientSecureSignThread(THREAD *thread, void *param);
UINT SecureWrite(UINT device_id, char *cert_name, X *x, char *key_name, K *k, char *pin);
UINT SecureEnum(UINT device_id, char *pin, TOKEN_LIST **cert_list, TOKEN_LIST **key_list);
UINT SecureDelete(UINT device_id, char *pin, char *cert_name, char *key_name);
TOKEN_LIST *EnumHub(SESSION *s);
UINT ChangePasswordAccept(CONNECTION *c, PACK *p);
UINT ChangePassword(CEDAR *cedar, CLIENT_OPTION *o, char *hubname, char *username, char *old_pass, char *new_pass);
void PackAddClientVersion(PACK *p, CONNECTION *c);
void NodeInfoToStr(wchar_t *str, UINT size, NODE_INFO *info);
void GenerateMachineUniqueHash(void *data);

LIST *NewCertList(bool load_root_and_chain);
void FreeCertList(LIST *o);
bool IsXInCertList(LIST *o, X *x);
void AddXToCertList(LIST *o, X *x);
void AddAllRootCertsToCertList(LIST *o);
void AddAllChainCertsToCertList(LIST *o);
X *DownloadCert(char *url);
X *FindCertIssuerFromCertList(LIST *o, X *x);
bool TryGetRootCertChain(LIST *o, X *x, bool auto_save, X **found_root_x);
bool TryGetParentCertFromCertList(LIST *o, X *x, LIST *found_chain);
bool DownloadAndSaveIntermediateCertificatesIfNecessary(X *x);


#endif	// PROTOCOL_H