// 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.


// DDNS.h
// Header of DDNS.c

#ifndef	DDNS_H
#define	DDNS_H

// Certificate hash
#define	DDNS_CERT_HASH		"EFAC5FA0CDD14E0F864EED58A73C35D7E33B62F3"

// Destination URL
#define	DDNS_URL_V4_GLOBAL	"https://x%c.x%c.x%c.x%c.servers.ddns.softether-network.net/ddns/ddns.aspx"
#define	DDNS_URL_V6_GLOBAL	"https://x%c.x%c.x%c.x%c.servers-v6.ddns.softether-network.net/ddns/ddns.aspx"
#define	DDNS_URL2_V4_GLOBAL	"http://get-my-ip.ddns.softether-network.net/ddns/getmyip.ashx"
#define	DDNS_URL2_V6_GLOBAL	"http://get-my-ip-v6.ddns.softether-network.net/ddns/getmyip.ashx"

#define	DDNS_REPLACE_URL_FOR_EAST_BFLETS	"https://senet-flets.v6.softether.co.jp/ddns/ddns.aspx"
#define	DDNS_REPLACE_URL_FOR_EAST_NGN		"https://senet.aoi.flets-east.jp/ddns/ddns.aspx"
#define	DDNS_REPLACE_URL_FOR_WEST_NGN		"https://senet.p-ns.flets-west.jp/ddns/ddns.aspx"

#define	DDNS_REPLACE_URL2_FOR_EAST_BFLETS	"http://senet-flets.v6.softether.co.jp/ddns/getmyip.ashx"
#define	DDNS_REPLACE_URL2_FOR_EAST_NGN		"http://senet.aoi.flets-east.jp/ddns/getmyip.ashx"
#define	DDNS_REPLACE_URL2_FOR_WEST_NGN		"http://senet.p-ns.flets-west.jp/ddns/getmyip.ashx"

// For China: Free version
#define	DDNS_URL_V4_ALT		"https://x%c.x%c.x%c.x%c.servers.ddns.uxcom.jp/ddns/ddns.aspx"
#define	DDNS_URL_V6_ALT		"https://x%c.x%c.x%c.x%c.servers-v6.ddns.uxcom.jp/ddns/ddns.aspx"
#define	DDNS_URL2_V4_ALT	"http://get-my-ip.ddns.uxcom.jp/ddns/getmyip.ashx"
#define	DDNS_URL2_V6_ALT	"http://get-my-ip-v6.ddns.uxcom.jp/ddns/getmyip.ashx"

#define	DDNS_RPC_MAX_RECV_SIZE				DYN32(DDNS_RPC_MAX_RECV_SIZE, (128 * 1024 * 1024))

// Connection Timeout
#define	DDNS_CONNECT_TIMEOUT		DYN32(DDNS_CONNECT_TIMEOUT, (15 * 1000))

// Communication time-out
#define	DDNS_COMM_TIMEOUT			DYN32(DDNS_COMM_TIMEOUT, (60 * 1000))

// Maximum length of the host name 
#define	DDNS_MAX_HOSTNAME			31

// DDNS Version
#define	DDNS_VERSION				1

// Period until the next registration in case of success
#define	DDNS_REGISTER_INTERVAL_OK_MIN		DYN32(DDNS_REGISTER_INTERVAL_OK_MIN, (1 * 60 * 60 * 1000))
#define	DDNS_REGISTER_INTERVAL_OK_MAX		DYN32(DDNS_REGISTER_INTERVAL_OK_MAX, (2 * 60 * 60 * 1000))

// Period until the next registration in case of failure
#define	DDNS_REGISTER_INTERVAL_NG_MIN		DYN32(DDNS_REGISTER_INTERVAL_NG_MIN, (1 * 60 * 1000))
#define	DDNS_REGISTER_INTERVAL_NG_MAX		DYN32(DDNS_REGISTER_INTERVAL_NG_MAX, (5 * 60 * 1000))

// The self IP address acquisition interval (If last trial succeeded)
#define	DDNS_GETMYIP_INTERVAL_OK_MIN		DYN32(DDNS_GETMYIP_INTERVAL_OK_MIN, (10 * 60 * 1000))
#define	DDNS_GETMYIP_INTERVAL_OK_MAX		DYN32(DDNS_GETMYIP_INTERVAL_OK_MAX, (20 * 60 * 1000))

// The self IP address acquisition interval (If last trial failed)
#define	DDNS_GETMYIP_INTERVAL_NG_MIN		DYN32(DDNS_GETMYIP_INTERVAL_NG_MIN, (1 * 60 * 1000))
#define	DDNS_GETMYIP_INTERVAL_NG_MAX		DYN32(DDNS_GETMYIP_INTERVAL_NG_MAX, (5 * 60 * 1000))

// Time difference to communicate with the DDNS server after a predetermined time has elapsed since the VPN Azure is disconnected
#define	DDNS_VPN_AZURE_CONNECT_ERROR_DDNS_RETRY_TIME_DIFF	DYN32(DDNS_VPN_AZURE_CONNECT_ERROR_DDNS_RETRY_TIME_DIFF, (120 * 1000))
#define	DDNS_VPN_AZURE_CONNECT_ERROR_DDNS_RETRY_TIME_DIFF_MAX	DYN32(DDNS_VPN_AZURE_CONNECT_ERROR_DDNS_RETRY_TIME_DIFF_MAX, (10 * 60 * 1000))

// DDNS Client
struct DDNS_CLIENT
{
	CEDAR *Cedar;							// Cedar
	THREAD *Thread;							// Thread
	UCHAR Key[SHA1_SIZE];					// Key
	LOCK *Lock;								// Lock
	volatile bool Halt;						// Halt flag
	EVENT *Event;							// Halt event
	char CurrentHostName[DDNS_MAX_HOSTNAME + 1];	// Current host name
	char CurrentFqdn[MAX_SIZE];				// Current FQDN
	char DnsSuffix[MAX_SIZE];				// DNS suffix
	char CurrentIPv4[MAX_SIZE];				// Current IPv4 address
	char CurrentIPv6[MAX_SIZE];				// Current IPv6 address
	UINT Err_IPv4, Err_IPv6;				// Last error
	UINT Err_IPv4_GetMyIp, Err_IPv6_GetMyIp;	// Last error (obtaining self IP address)
	bool KeyChanged;						// Flag to indicate that the key has been changed
	char LastMyIPv4[MAX_SIZE];				// Self IPv4 address that were acquired on last
	char LastMyIPv6[MAX_SIZE];				// Self IPv6 address that were acquired on last
	char CurrentAzureIp[MAX_SIZE];			// IP address of Azure Server to be used
	UINT64 CurrentAzureTimestamp;			// Time stamp to be presented to the Azure Server
	char CurrentAzureSignature[MAX_SIZE];	// Signature to be presented to the Azure Server
	char AzureCertHash[MAX_SIZE];			// Azure Server certificate hash
	INTERNET_SETTING InternetSetting;		// Internet connection settings

	UINT64 NextRegisterTick_IPv4, NextRegisterTick_IPv6;		// Next register time
	UINT64 NextGetMyIpTick_IPv4, NextGetMyIpTick_IPv6;			// Next self IP acquisition time
};

// DDNS Register Param
struct DDNS_REGISTER_PARAM
{
	char NewHostname[DDNS_MAX_HOSTNAME + 1];	// Host name after the change
};

// The current status of the DDNS
struct DDNS_CLIENT_STATUS
{
	UINT Err_IPv4, Err_IPv6;				// Last error
	char CurrentHostName[DDNS_MAX_HOSTNAME + 1];	// Current host name
	char CurrentFqdn[MAX_SIZE];				// Current FQDN
	char DnsSuffix[MAX_SIZE];				// DNS suffix
	char CurrentIPv4[MAX_SIZE];				// Current IPv4 address
	char CurrentIPv6[MAX_SIZE];				// Current IPv6 address
	char CurrentAzureIp[MAX_SIZE];			// IP address of Azure Server to be used
	UINT64 CurrentAzureTimestamp;			// Time stamp to be presented to the Azure Server
	char CurrentAzureSignature[MAX_SIZE];	// Signature to be presented to the Azure Server
	char AzureCertHash[MAX_SIZE];			// Azure Server certificate hash
	INTERNET_SETTING InternetSetting;		// Internet settings
};

// Function prototype
DDNS_CLIENT *NewDDNSClient(CEDAR *cedar, UCHAR *key, INTERNET_SETTING *t);
void FreeDDNSClient(DDNS_CLIENT *c);
void DCGenNewKey(UCHAR *key);
void DCThread(THREAD *thread, void *param);
UINT DCRegister(DDNS_CLIENT *c, bool ipv6, DDNS_REGISTER_PARAM *p, char *replace_v6);
UINT DCGetMyIpMain(DDNS_CLIENT *c, bool ipv6, char *dst, UINT dst_size, bool use_ssl, char *replace_v6);
UINT DCGetMyIp(DDNS_CLIENT *c, bool ipv6, char *dst, UINT dst_size, char *replace_v6);
void DCUpdateNow(DDNS_CLIENT *c);
void DCGetStatus(DDNS_CLIENT *c, DDNS_CLIENT_STATUS *st);
UINT DCChangeHostName(DDNS_CLIENT *c, char *hostname);
void DCSetInternetSetting(DDNS_CLIENT *c, INTERNET_SETTING *t);
void DCGetInternetSetting(DDNS_CLIENT *c, INTERNET_SETTING *t);

#endif	// DDNS_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/
