// CoreUtil
// 
// Copyright (C) 2012-2014 Daiyuu Nobori. All Rights Reserved.
// Copyright (C) 2012-2014 SoftEther VPN Project at University of Tsukuba. All Rights Reserved.
// 
// 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.


using System;
using System.Threading;
using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using System.Text;
using System.Configuration;
using System.Collections;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Diagnostics;
using System.Web.Mail;
using System.Net;
using System.Net.Sockets;
using System.Net.NetworkInformation;
using System.Net.Mail;
using System.Net.Mime;
using System.Reflection;
using CoreUtil;

namespace CoreUtil
{
	public static class Env
	{
		static object lockObj = new object();
		static bool inited = false;

		static Env()
		{
			initCache();
		}

		static void initCache()
		{
			lock (lockObj)
			{
				if (inited == false)
				{
					initValues();
					inited = true;
				}
			}
		}

		static string homeDir;
		static public string HomeDir
		{
			get { return homeDir; }
		}
		static string exeFileName;
		static public string ExeFileName
		{
			get { return exeFileName; }
		}
		static string exeFileDir;
		static public string ExeFileDir
		{
			get { return exeFileDir; }
		}
		static string windowsDir;
		static public string WindowsDir
		{
			get { return windowsDir; }
		}
		static string systemDir;
		static public string SystemDir
		{
			get { return systemDir; }
		}
		static string tempDir;
		static public string TempDir
		{
			get { return tempDir; }
		}
		static string winTempDir;
		static public string WinTempDir
		{
			get { return winTempDir; }
		}
		static string windowsDrive;
		static public string WindowsDrive
		{
			get { return windowsDrive; }
		}
		static string programFilesDir;
		static public string ProgramFilesDir
		{
			get { return programFilesDir; }
		}
		static string personalStartMenuDir;
		static public string PersonalStartMenuDir
		{
			get { return personalStartMenuDir; }
		}
		static string personalProgramsDir;
		static public string PersonalProgramsDir
		{
			get { return personalProgramsDir; }
		}
		static string personalStartupDir;
		static public string PersonalStartupDir
		{
			get { return personalStartupDir; }
		}
		static string personalAppDataDir;
		static public string PersonalAppDataDir
		{
			get { return personalAppDataDir; }
		}
		static string personalDesktopDir;
		static public string PersonalDesktopDir
		{
			get { return personalDesktopDir; }
		}
		static string myDocumentsDir;
		static public string MyDocumentsDir
		{
			get { return myDocumentsDir; }
		}
		static string localAppDataDir;
		static public string LocalAppDataDir
		{
			get { return localAppDataDir; }
		}
		static string userName;
		static public string UserName
		{
			get { return userName; }
		}
		static string userNameEx;
		static public string UserNameEx
		{
			get { return userNameEx; }
		}
		static string machineName;
		static public string MachineName
		{
			get { return machineName; }
		}
		static string commandLine;
		public static string CommandLine
		{
			get { return commandLine; }
		}
		public static StrToken CommandLineList
		{
			get
			{
				return new StrToken(CommandLine);
			}
		}
		static OperatingSystem osInfo;
		public static OperatingSystem OsInfo
		{
			get { return osInfo; }
		}
		static bool isNt;
		public static bool IsNt
		{
			get { return isNt; }
		}
		static bool is9x;
		public static bool Is9x
		{
			get { return is9x; }
		}
		static bool isCe;
		public static bool IsCe
		{
			get { return isCe; }
		}
		static bool isLittleEndian;
		public static bool IsLittleEndian
		{
			get { return Env.isLittleEndian; }
		}
		public static bool IsBigEndian
		{
			get { return !IsLittleEndian; }
		}
		static bool isAdmin;
		public static bool IsAdmin
		{
			get { return Env.isAdmin; }
		}
		static int processId;
		public static int ProcessId
		{
			get { return Env.processId; }
		}
		static string myTempDir;
		public static string MyTempDir
		{
			get { return myTempDir; }
		}
		static IO lockFile;

		public static bool Is64BitProcess
		{
			get
			{
				return (IntPtr.Size == 8);
			}
		}

		public static bool Is64BitWindows
		{
			get
			{
				return Is64BitProcess || Kernel.InternalCheckIsWow64();
			}
		}

		public static bool IsWow64
		{
			get
			{
				return Kernel.InternalCheckIsWow64();
			}
		}

		static void initValues()
		{
			exeFileName = IO.RemoteLastEnMark(getMyExeFileName());
			if (Str.IsEmptyStr(exeFileName) == false)
			{
				exeFileDir = IO.RemoteLastEnMark(Path.GetDirectoryName(exeFileName));
			}
			else
			{
				exeFileDir = "";
			}
			homeDir = IO.RemoteLastEnMark(Kernel.GetEnvStr("HOME"));
			if (Str.IsEmptyStr(homeDir))
			{
				homeDir = IO.RemoteLastEnMark(Kernel.GetEnvStr("HOMEDRIVE") + Kernel.GetEnvStr("HOMEPATH"));
			}
			if (Str.IsEmptyStr(homeDir))
			{
				homeDir = CurrentDir;
			}
			systemDir = IO.RemoteLastEnMark(Environment.GetFolderPath(Environment.SpecialFolder.System));
			windowsDir = IO.RemoteLastEnMark(Path.GetDirectoryName(systemDir));
			tempDir = IO.RemoteLastEnMark(Path.GetTempPath());
			winTempDir = IO.RemoteLastEnMark(Path.Combine(windowsDir, "Temp"));
			IO.MakeDir(winTempDir);
			if (windowsDir.Length >= 2 && windowsDir[1] == ':')
			{
				windowsDrive = windowsDir.Substring(0, 2).ToUpper();
			}
			else
			{
				windowsDrive = "C:";
			}
			programFilesDir = IO.RemoteLastEnMark(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles));
			personalStartMenuDir = IO.RemoteLastEnMark(Environment.GetFolderPath(Environment.SpecialFolder.StartMenu));
			personalProgramsDir = IO.RemoteLastEnMark(Environment.GetFolderPath(Environment.SpecialFolder.Programs));
			personalStartupDir = IO.RemoteLastEnMark(Environment.GetFolderPath(Environment.SpecialFolder.Startup));
			personalAppDataDir = IO.RemoteLastEnMark(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData));
			personalDesktopDir = IO.RemoteLastEnMark(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory));
			myDocumentsDir = IO.RemoteLastEnMark(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments));
			localAppDataDir = IO.RemoteLastEnMark(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData));
			userName = Environment.UserName;
			try
			{
				userNameEx = Environment.UserDomainName + "\\" + userName;
			}
			catch
			{
				userNameEx = userName;
			}
			machineName = Environment.MachineName;
			commandLine = initCommandLine(Environment.CommandLine);
			osInfo = Environment.OSVersion;
			isNt = (osInfo.Platform == PlatformID.Win32NT);
			isCe = (osInfo.Platform == PlatformID.WinCE);
			is9x = !(isNt || isCe);
			isLittleEndian = BitConverter.IsLittleEndian;
			processId = System.Diagnostics.Process.GetCurrentProcess().Id;
			isAdmin = checkIsAdmin();
			initMyTempDir();
		}

		static void deleteUnusedTempDir()
		{
			DirEntry[] files;

			files = IO.EnumDir(Env.tempDir);

			foreach (DirEntry e in files)
			{
				if (e.IsFolder)
				{
					if (e.FileName.StartsWith("NET_", StringComparison.CurrentCultureIgnoreCase) && e.FileName.Length == 8)
					{
						string dirFullName = Path.Combine(Env.tempDir, e.fileName);
						string lockFileName = Path.Combine(dirFullName, "LockFile.dat");
						bool deleteNow = false;

						try
						{
							IO io = IO.FileOpen(lockFileName);
							io.Close();

							try
							{
								io = IO.FileOpen(lockFileName, true);
								deleteNow = true;
								io.Close();
							}
							catch
							{
							}
						}
						catch
						{
							DirEntry[] files2;

							deleteNow = true;

							try
							{
								files2 = IO.EnumDir(dirFullName);

								foreach (DirEntry e2 in files2)
								{
									if (e2.IsFolder == false)
									{
										string fullPath = Path.Combine(dirFullName, e2.fileName);

										try
										{
											IO io2 = IO.FileOpen(fullPath, true);
											io2.Close();
										}
										catch
										{
											deleteNow = false;
										}
									}
								}
							}
							catch
							{
								deleteNow = false;
							}
						}

						if (deleteNow)
						{
							IO.DeleteDir(dirFullName, true);
						}
					}
				}
			}
		}

		static void initMyTempDir()
		{
			try
			{
				deleteUnusedTempDir();
			}
			catch
			{
			}

			int num = 0;

			while (true)
			{
				byte[] rand = Secure.Rand(2);
				string tmp2 = Str.ByteToStr(rand);

				string tmp = Path.Combine(Env.tempDir, "NET_" + tmp2);

				if (IO.IsDirExists(tmp) == false && IO.MakeDir(tmp))
				{
					Env.myTempDir = tmp;

					break;
				}

				if ((num++) >= 100)
				{
					throw new SystemException();
				}
			}

			string lockFileName = Path.Combine(Env.myTempDir, "LockFile.dat");
			lockFile = IO.FileCreate(lockFileName);
		}

		static bool checkIsAdmin()
		{
			try
			{
				string name = "Vpn_Check_Admin_Key_NET_" + processId.ToString();
				string teststr = Str.GenRandStr();

				if (Reg.WriteStr(RegRoot.LocalMachine, "", name, teststr) == false)
				{
					return false;
				}

				try
				{

					string ret = Reg.ReadStr(RegRoot.LocalMachine, "", name);

					if (ret == teststr)
					{
						return true;
					}

					return false;
				}
				finally
				{
					Reg.DeleteValue(RegRoot.LocalMachine, "", name);
				}
			}
			catch
			{
				return false;
			}
		}

		static string initCommandLine(string src)
		{
			try
			{
				int i;
				if (src.Length >= 1 && src[0] == '\"')
				{
					i = src.IndexOf('\"', 1);
				}
				else
				{
					i = src.IndexOf(' ');
				}

				if (i == -1)
				{
					return "";
				}
				else
				{
					return src.Substring(i + 1).TrimStart(' ');
				}
			}
			catch
			{
				return "";
			}
		}

		static string getMyExeFileName()
		{
			try
			{
				Assembly mainAssembly = Assembly.GetEntryAssembly();
				Module[] modules = mainAssembly.GetModules();
				return modules[0].FullyQualifiedName;
			}
			catch
			{
				return "";
			}
		}

		static public string CurrentDir
		{
			get
			{
				return IO.RemoteLastEnMark(Environment.CurrentDirectory);
			}
		}
		static public string NewLine
		{
			get
			{
				return Environment.NewLine;
			}
		}
	}
}
