Module Svc
    ' Каталог исполняемых файлов UltraVNC
    Private sRunTimeDir As String = String.Empty

    ' Исполняемые и конфигурационные файлы UltraVNC
    ' В процессе инициализации распаковываются из ресурсов приложения в <sRunTimeDir>
    Private aExecResources(,) As String = {
        {"lvnc_rs_ini", "\lvnc_rs.ini"},
        {"ultravnc_ini", "\UltraVNC\ultravnc.ini"},
        {"setpasswd_exe", "\UltraVNC\setpasswd.exe"},
        {"winvnc_exe", "\UltraVNC\winvnc.exe"},
        {"authadmin_dll", "\UltraVNC\authadmin.dll"},
        {"ddengine_dll", "\UltraVNC\ddengine.dll"},
        {"SCHook_dll", "\UltraVNC\SCHook.dll"},
        {"vnchooks_dll", "\UltraVNC\vnchooks.dll"},
        {"SecureVNCPlugin_dsm", "\UltraVNC\SecureVNCPlugin.dsm"}
    }

    ' Адрес хоста и порт VNC-прокси
    Private sProxyHost As String = String.Empty
    Private sProxyPort As String = String.Empty

    ' ID сеанса для подключения
    Public sSupportID As String = String.Empty
    ' Пароль для подключения
    Public sSupportPasswd As String = String.Empty

    ' Флаг доступности VNC-прокси
    ' Может принимать следующие значения:
    '   0 = Неопределённое состояние (при старте приложения);
    '   1 = Прокси доступен для подключения;
    '   2 = Покси недоступен.
    Public bProxyStatus As Byte = 0

    ' Настройки приложения
    Private oConfigFile As New IniFile

    ' Процесс winvnc.exe
    Private VNCProc As Process = Nothing

    ''' <summary>
    '''     Инициализация приложения
    ''' </summary>
    ''' <returns>
    '''     True  - в случае успешной инициализации
    '''     False - что-то пошло не так
    ''' </returns>
    Public Function Init() As Boolean
        sRunTimeDir = GetAllUsersDir() & "\LVNC-RS"

        If sRunTimeDir.Length > 0 Then
            ' Если расположение каталога исполняемых файлов получено,
            ' проверяем его наличие на диске и, при необходимости, создаем.
            ' Так же проверяем наличие всех файлов UltraVNC. При необходимости
            ' распаковываем из ресурсов.
            If Not CheckExecResources() Then
                Return False
            End If

            ' Читаем настройки
            oConfigFile.Load(sRunTimeDir & "\lvnc_rs.ini")
            sProxyHost = oConfigFile.GetKeyValue("repeater", "host")
            sProxyPort = oConfigFile.GetKeyValue("repeater", "serverport")

            If sProxyHost.Length = 0 Or sProxyPort.Length = 0 Then Return False

            ' Генерируем ID и пароль
            sSupportID = GetSupportID()
            sSupportPasswd = GetSupportPasswd()

            Return True
        Else
            Return False
        End If
    End Function

    Public Sub CheckProxy()
        Dim hostEntry As Net.IPHostEntry
        Dim ipAddress As Net.IPAddress
        Dim epHost As Net.IPEndPoint
        Dim socket As Net.Sockets.Socket

        Try
            hostEntry = Net.Dns.GetHostEntry(sProxyHost)
        Catch ex As Exception
            bProxyStatus = 2
            Exit Sub
        End Try

        If hostEntry.AddressList.Count > 0 Then
            ipAddress = hostEntry.AddressList.FirstOrDefault
            epHost = New Net.IPEndPoint(ipAddress, Convert.ToInt32(sProxyPort))
            socket = New Net.Sockets.Socket(Net.Sockets.AddressFamily.InterNetwork, Net.Sockets.SocketType.Stream, Net.Sockets.ProtocolType.Tcp)

            Try
                socket.Connect(epHost)
            Catch ex As Exception

            End Try
        End If

        If socket.Connected Then
            bProxyStatus = 1
        Else
            bProxyStatus = 2
        End If

        Try
            socket.Disconnect(False)
        Catch ex As Exception

        End Try
    End Sub

    Public Function StartVNC() As Boolean
        Dim sVNCDir As String = sRunTimeDir & "\UltraVNC"
        Dim sVNCExec As String = sVNCDir & "\winvnc.exe"
        Dim sVNCExecParam As String = "-autoreconnect ID:" & sSupportID & " -connect " & sProxyHost & ":" & sProxyPort & " -run"

        Dim VNCStartInfo As New ProcessStartInfo
        With VNCStartInfo
            .Arguments = sVNCExecParam
            .FileName = sVNCExec
            .UseShellExecute = True
            .WorkingDirectory = sVNCDir
        End With

        Try
            VNCProc = Process.Start(VNCStartInfo)
        Catch ex As System.ComponentModel.Win32Exception
            Return False
        End Try

        Return True
    End Function

    Public Function StopVNC() As Boolean
        If VNCProc IsNot Nothing And VNCProc.Id <> 0 Then
            VNCProc.
        End If
    End Function

    Private Function GetAllUsersDir() As String
        Dim sRegShellPath As String = "Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders"
        Dim sAllUsersDir As String = String.Empty
        Dim sCommonDesktop As String = String.Empty

        Dim regKey As Global.Microsoft.Win32.RegistryKey

        Try
            regKey = Global.Microsoft.Win32.Registry.LocalMachine.OpenSubKey(sRegShellPath, False)
            sCommonDesktop = regKey.GetValue("Common Desktop")
        Catch ex As Exception
            sCommonDesktop = ""
        End Try

        If sCommonDesktop.Length > 0 Then
            Dim a() = sCommonDesktop.Split("\")
            Dim l As Integer = a.Length - 2
            ReDim Preserve a(l)

            sAllUsersDir = String.Join("\", a)
        Else
            sAllUsersDir = ""
        End If

        Return sAllUsersDir
    End Function

    Private Function CheckExecResources() As Boolean
        Dim resItem As Object
        Dim resContent As Byte()

        If Not IO.Directory.Exists(sRunTimeDir) Then
            IO.Directory.CreateDirectory(sRunTimeDir)
        End If

        If Not IO.Directory.Exists(sRunTimeDir & "\UltraVNC") Then
            IO.Directory.CreateDirectory(sRunTimeDir & "\UltraVNC")
        End If

        For i As Integer = 0 To UBound(aExecResources)
            If Not IO.File.Exists(sRunTimeDir & aExecResources(i, 1)) Then
                resItem = My.Resources.ResourceManager.GetObject(aExecResources(i, 0))
                If TypeOf (resItem) Is String Then
                    resContent = Text.Encoding.Default.GetBytes(resItem.ToString)
                Else
                    resContent = resItem
                End If

                Using file As New IO.FileStream(sRunTimeDir & aExecResources(i, 1), IO.FileMode.Create)
                    file.Write(resContent, 0, resContent.Length)
                End Using
            End If
        Next

        Return True
    End Function

    Private Function GetSupportID() As String
        ' Если ID сохранён в файле настроек, возвращаем его
        Dim sID As String = oConfigFile.GetKeyValue("lvnc", "ID")
        If sID IsNot Nothing And sID <> String.Empty Then Return sID

        ' Генерация ID на основе MAC-адреса первого доступного и активного сетевого интерфейса (Ethernet или Wi-Fi)
        Dim aNics() As Net.NetworkInformation.NetworkInterface = Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()
        Dim sMAC As String = String.Empty
        Dim iID As Integer = 0

        For Each nic As Net.NetworkInformation.NetworkInterface In aNics
            If (nic.NetworkInterfaceType = Net.NetworkInformation.NetworkInterfaceType.Ethernet Or
                    nic.NetworkInterfaceType = Net.NetworkInformation.NetworkInterfaceType.Wireless80211) And
                    nic.OperationalStatus = Net.NetworkInformation.OperationalStatus.Up Then
                sMAC = nic.GetPhysicalAddress.ToString
                Exit For
            End If
        Next

        Dim strBuilder As New Text.StringBuilder(sMAC)
        Dim startIndex As Integer = strBuilder.Length - (strBuilder.Length Mod 2) - 2

        For i As Integer = startIndex To 2 Step -2
            strBuilder.Insert(i, ":"c)
        Next i

        Dim aMAC() = strBuilder.ToString.Split(":")
        Dim n As Integer = 0
        For i As Integer = 0 To UBound(aMAC)
            n = Convert.ToInt32(aMAC(i), 16)
            Debug.Print(n)

            iID = ((iID * 16) + n) Mod 99999999

            If iID < 99999999 Then
                iID = iID + 10000000
            End If
        Next

        ' Сохраняем ID в конфиг
        oConfigFile.SetKeyValue("lvnc", "ID", iID.ToString)
        oConfigFile.Save(sRunTimeDir & "\lvnc_rs.ini")

        Return iID.ToString
    End Function

    Private Function GetSupportPasswd() As String
        ' Проверяем наличие сохранённого пароля на случай перезапуска от имени администратора
        Dim pwd As String = oConfigFile.GetKeyValue("lvnc", "passwd")
        If pwd IsNot Nothing And pwd <> String.Empty Then Return pwd

        Dim rndGen As New System.Random

        Return (rndGen.Next(1000, 10000).ToString)
    End Function
End Module