重构网关切换逻辑（待测试）
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@ -1,188 +1,263 @@
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# $Global:TestDomain = "www.google.com" #测试代理是否可用
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# $Global:TestIP = "223.5.5.5" #测试是否连接网络
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# $Global:originalDns = "223.5.5.5" #默认DNS
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# $Global:originalGateway = "192.168.6.1" #默认网关
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# $Global:CustomGateway = "192.168.6.2" #代理网关
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# $Global:CustomIP = "192.168.6.4" #默认ip
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# $Global:TargetNetworkAdapter = {} #网络适配器实例
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# $Global:TargetNetworkAdapterKeyword = "Ethernet" #网络适配器名字通配符
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# $Global:isCustomGateway = $false #是否为自定义网关
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. (Join-Path $PSScriptRoot 'config.ps1')
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. (Join-Path $PSScriptRoot 'logger.ps1')
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. (Join-Path $PSScriptRoot 'proxy-test.ps1')
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. $(-Join($(Get-Location).Path, '\config.ps1'))
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. $(-Join($(Get-Location).Path, '\proxy-test.ps1'))
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. $(-Join($(Get-Location).Path, '\logger.ps1'))
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$Script:ProxySuccessCount = 0
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$Script:ProxyFailureCount = 0
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$Script:LastSwitchTime = (Get-Date).AddSeconds(-1 * $Global:SwitchCooldownSeconds)
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function isDhcpEnable(){
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return Get-NetIPConfiguration | select-object InterfaceAlias, IPv4Address, @{n="dhcp";e={$_.NetIPv4Interface.DHCP}} | Select-Object -ExpandProperty dhcp
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function Test-IsAdministrator {
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$identity = [Security.Principal.WindowsIdentity]::GetCurrent()
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$principal = [Security.Principal.WindowsPrincipal]$identity
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return $principal.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)
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}
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function isForeignConnected {
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# check foreign network availability
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$result = Test-NetConnection -ComputerName $Global:TestDomain -Port 443
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if ($result.TcpTestSucceeded) {
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Write-Log -Message "Successfully connected to $($Global:TestDomain) via HTTPS. isCustomGateway:$($Global:isCustomGateway)"
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return $true
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} else {
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Write-Log -Message "Failed to connect to $($Global:TestDomain) via HTTPS. isCustomGateway:$($Global:isCustomGateway)"
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return $false
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}
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}
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function isNetworkConnected {
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# check network availability
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$result = $(Test-Connection -ComputerName $Global:TestIP -Count 1).Status -eq 'Success'
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if ($result) {
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Write-Log -Message "Successfully connected to $($Global:TestIP) via ICMP. isCustomGateway:$($Global:isCustomGateway)"
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return $true
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} else {
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Write-Log -Message "Failed to connect to $($Global:TestIP) via ICMP. isCustomGateway:$($Global:isCustomGateway)"
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return $false
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}
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}
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function setDhcp($enable){
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if($enable){
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Set-NetIPInterface -InterfaceAlias $Global:TargetNetworkAdapter.name -Dhcp Enabled
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Write-Log -Message "enable dhcp"
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} else {
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Set-NetIPInterface -InterfaceAlias $Global:TargetNetworkAdapter.name -Dhcp Disabled
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Write-Log -Message "disable dhcp"
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}
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}
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function changeGateway{
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param(
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$adapter,$isCustomGateway
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)
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Write-Log -Message "Changing gateway for adapter: $($adapter.Name) isCustomGateway $($isCustomGateway)"
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# check gateway availability
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if($isCustomGateway){
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$currentGateway = $(Get-NetIPConfiguration).IPv4DefaultGateway.NextHop
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if($currentGateway -eq $Global:CustomGateway){
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Write-Log -Message "current gateway is $currentGateway same as targetGateway $Global:TargetGateway, change gateway canceled"
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$Global:isCustomGateway = $true
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return
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}
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$result = $(Test-Connection $Global:CustomGateway -Count 1).Status
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if (! ($result -eq 'Success')){
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Write-Log -Message "custom gateway $Global:CustomGateway is $result, refuse to change"
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return
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}
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}
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# check current ip configuration
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$existingIP = Get-NetIPAddress -InterfaceAlias $adapter.Name -AddressFamily IPv4
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# if have ip configuration, delete it
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if ($existingIP) {
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Write-Log -Message "Removing existing IP address: $($existingIP.IPAddress)"
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Remove-NetIPAddress -InterfaceAlias $adapter.Name -Confirm:$false
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}
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# delete current route(gateway)
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$existingRoute = Get-NetRoute -InterfaceAlias $adapter.Name -DestinationPrefix "0.0.0.0/0"
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if ($existingRoute) {
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Write-Log -Message "Removing existing default route..."
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Remove-NetRoute -InterfaceAlias $adapter.Name -Confirm:$false
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}
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if ($isCustomGateway){ #setting gateway
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# config customGateway
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$Global:isCustomGateway = $true
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# setting dns server
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Set-DnsClientServerAddress -InterfaceAlias $adapter.name -ServerAddresses ($Global:CustomGateway, $Global:CustomGateway)
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# disable dhcp
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setDhcp($false)
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# setting gateway to customGateway
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New-NetIPAddress -InterfaceAlias $adapter.Name -AddressFamily IPv4 -IPAddress $Global:CustomIP -PrefixLength 24 -DefaultGateway $Global:CustomGateway
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} else {
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# config originalGateway
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$Global:isCustomGateway = $false
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# setting dns server
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Set-DnsClientServerAddress -InterfaceAlias $adapter.name -ServerAddresses ($Global:originalDns, $Global:originalDns)
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# disable dhcp
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setDhcp($false)
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# setting gateway to originalGateway
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New-NetIPAddress -InterfaceAlias $adapter.Name -AddressFamily IPv4 -IPAddress $Global:CustomIP -PrefixLength 24 -DefaultGateway $Global:originalGateway
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}
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Start-Sleep 3
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}
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function getIPAddress(){
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$IP = Get-NetIPConfiguration | Select-Object -ExpandProperty IPV4Address | Select-Object -ExpandProperty IPAddress
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return $IP
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}
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function getNetworkAdapter(){
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$networkAdapters = Get-NetAdapter | ForEach-Object {
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[PSCustomObject]@{
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Name = $_.Name
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Interface = $_.InterfaceDescription
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Status = $_.Status
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LinkSpeed = $_.LinkSpeed
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MacAddress = $_.MacAddress
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}
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}
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foreach ($networkAdapter in $networkAdapters){
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if($networkAdapter.name.Contains($TargetNetworkAdapterKeyword)){
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$Global:TargetNetworkAdapter = $networkAdapter
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break;
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}
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}
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Write-Log -Message "getNetworkAdapter: $Global:TargetNetworkAdapter"
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}
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function init {
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Write-Log -Message "GateWay-KeepAliveForPowershell is start" -ToEventLog
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# check permission
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$IsAdmin = [Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()
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if (-not $IsAdmin.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)) {
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# if not admin permission, restart it with admin permission
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function Request-Administrator {
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Write-Log -Message "Requesting Administrator privileges..."
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Start-Process pwsh -ArgumentList "-NoExit", "-File", $PSCommandPath -Verb RunAs
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exit
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}
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Write-Log -Message "Running with Administrator privileges!"
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# get netAdapter instance
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getNetworkAdapter
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Write-Log -Message "current adapter: $($Global:TargetNetworkAdapter.name)"
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# try to change to customGateway at start
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changeGateway $Global:TargetNetworkAdapter $true
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}
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function loop(){
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while($true){
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# if network offline and using customGateway, try to restore to originalGateway
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if((!$(isNetworkConnected)) -and $Global:isCustomGateway){
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Write-Log -Message "Network is down, change to original gateway" -ToEventLog
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changeGateway $Global:TargetNetworkAdapter $false
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function Get-TargetAdapter {
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$adapter = Get-NetAdapter |
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Where-Object { $_.Name.Contains($Global:TargetNetworkAdapterKeyword) -and $_.Status -eq "Up" } |
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Select-Object -First 1
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if (-not $adapter) {
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throw "No active network adapter found by keyword '$($Global:TargetNetworkAdapterKeyword)'."
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}
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# if customGateway proxy is working and using original gateway, try to change to customGateway
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if($(Test-SocksProxy -ProxyHost $Global:CustomGateway -ProxyPort 1070) -and (!$Global:isCustomGateway)){
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Write-Log -Message "isCustomGateway $Global:isCustomGateway"
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Write-Log -Message "proxy host is up, change to custom gateway" -ToEventLog
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changeGateway $Global:TargetNetworkAdapter $true
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$Global:TargetNetworkAdapter = $adapter
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Write-Log -Message "Target adapter: $($adapter.Name), InterfaceIndex: $($adapter.ifIndex)"
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return $adapter
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}
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function Get-CurrentDefaultGateway {
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param(
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[Parameter(Mandatory)]
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[int]$InterfaceIndex
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)
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$route = Get-NetRoute -InterfaceIndex $InterfaceIndex -DestinationPrefix "0.0.0.0/0" -ErrorAction SilentlyContinue |
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Sort-Object RouteMetric, ifMetric |
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Select-Object -First 1
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if ($route) {
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return $route.NextHop
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}
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# if customGateway proxy is not working but network still online, do nothing
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return $null
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}
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Start-Sleep 1
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function Get-CurrentMode {
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param(
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[Parameter(Mandatory)]
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[int]$InterfaceIndex
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)
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$gateway = Get-CurrentDefaultGateway -InterfaceIndex $InterfaceIndex
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if ($gateway -eq $Global:CustomGateway) {
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return "PROXY"
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}
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return "DIRECT"
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}
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function Test-CooldownExpired {
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$elapsed = ((Get-Date) - $Script:LastSwitchTime).TotalSeconds
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return $elapsed -ge $Global:SwitchCooldownSeconds
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}
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function Test-HostReachable {
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param(
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[Parameter(Mandatory)]
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[string]$Host
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)
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try {
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return [bool](Test-Connection -ComputerName $Host -Count 1 -Quiet -ErrorAction Stop)
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} catch {
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Write-Log -Message "Host check failed for ${Host}: $_"
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return $false
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}
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}
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init
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loop
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function Test-ProxyDns {
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try {
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$result = Resolve-DnsName -Name $Global:TestDomain -Server $Global:CustomGateway -ErrorAction Stop
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return [bool]$result
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} catch {
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Write-Log -Message "Proxy DNS check failed via $($Global:CustomGateway): $_"
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return $false
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}
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}
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function Test-InternetTcp {
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try {
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return [bool](Test-NetConnection -ComputerName $Global:TestDomain -Port 443 -InformationLevel Quiet)
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} catch {
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Write-Log -Message "Internet TCP check failed for $($Global:TestDomain):443: $_"
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return $false
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}
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}
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function Test-ProxyHealthy {
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$gatewayReachable = Test-HostReachable -Host $Global:CustomGateway
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if (-not $gatewayReachable) {
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Write-Log -Message "Proxy gateway $($Global:CustomGateway) is not reachable."
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return $false
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}
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$dnsOk = Test-ProxyDns
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if (-not $dnsOk) {
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return $false
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}
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if ($Global:UseSocksProxyHealthCheck) {
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return Test-SocksProxy -ProxyHost $Global:CustomGateway -ProxyPort $Global:ProxyPort -TestHost $Global:TestDomain -TestPort 443
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}
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return $true
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}
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function Set-DefaultGateway {
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param(
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[Parameter(Mandatory)]
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[int]$InterfaceIndex,
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[Parameter(Mandatory)]
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[string]$Gateway
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)
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$currentGateway = Get-CurrentDefaultGateway -InterfaceIndex $InterfaceIndex
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if ($currentGateway -eq $Gateway) {
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Write-Log -Message "Default gateway is already $Gateway."
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return
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}
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$existingRoutes = Get-NetRoute -InterfaceIndex $InterfaceIndex -DestinationPrefix "0.0.0.0/0" -ErrorAction SilentlyContinue
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foreach ($route in $existingRoutes) {
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Write-Log -Message "Removing default route $($route.NextHop) from interface $InterfaceIndex."
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Remove-NetRoute -InterfaceIndex $InterfaceIndex -DestinationPrefix "0.0.0.0/0" -NextHop $route.NextHop -Confirm:$false
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}
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Write-Log -Message "Adding default route $Gateway to interface $InterfaceIndex."
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New-NetRoute -InterfaceIndex $InterfaceIndex -DestinationPrefix "0.0.0.0/0" -NextHop $Gateway -RouteMetric 1 | Out-Null
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}
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function Set-ProxyDns {
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param(
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[Parameter(Mandatory)]
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[int]$InterfaceIndex
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)
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Write-Log -Message "Setting DNS to proxy gateway $($Global:CustomGateway)."
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Set-DnsClientServerAddress -InterfaceIndex $InterfaceIndex -ServerAddresses $Global:CustomGateway
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Clear-DnsClientCache
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}
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function Set-DirectDns {
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param(
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[Parameter(Mandatory)]
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[int]$InterfaceIndex
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)
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if ($Global:DirectDnsServers -and $Global:DirectDnsServers.Count -gt 0) {
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Write-Log -Message "Setting DNS to $($Global:DirectDnsServers -join ', ')."
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Set-DnsClientServerAddress -InterfaceIndex $InterfaceIndex -ServerAddresses $Global:DirectDnsServers
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} else {
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Write-Log -Message "Resetting DNS to DHCP provided servers."
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Set-DnsClientServerAddress -InterfaceIndex $InterfaceIndex -ResetServerAddresses
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}
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Clear-DnsClientCache
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}
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function Switch-ToProxy {
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param(
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[Parameter(Mandatory)]
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[int]$InterfaceIndex
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)
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Write-Log -Message "Switching to proxy gateway $($Global:CustomGateway)." -ToEventLog
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Set-ProxyDns -InterfaceIndex $InterfaceIndex
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Set-DefaultGateway -InterfaceIndex $InterfaceIndex -Gateway $Global:CustomGateway
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$Global:isCustomGateway = $true
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$Script:LastSwitchTime = Get-Date
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}
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function Switch-ToDirect {
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param(
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[Parameter(Mandatory)]
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[int]$InterfaceIndex
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)
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Write-Log -Message "Switching to direct gateway $($Global:originalGateway)." -ToEventLog
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Set-DefaultGateway -InterfaceIndex $InterfaceIndex -Gateway $Global:originalGateway
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Set-DirectDns -InterfaceIndex $InterfaceIndex
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$Global:isCustomGateway = $false
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$Script:LastSwitchTime = Get-Date
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}
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function Initialize-GatewayKeepAlive {
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if (-not (Test-IsAdministrator)) {
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Request-Administrator
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}
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Write-Log -Message "GateWay-KeepAliveForPowershell is start" -ToEventLog
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Write-Log -Message "Running with Administrator privileges."
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$adapter = Get-TargetAdapter
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$mode = Get-CurrentMode -InterfaceIndex $adapter.ifIndex
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$Global:isCustomGateway = $mode -eq "PROXY"
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Write-Log -Message "Initial mode: $mode"
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return $adapter
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}
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function Start-GatewayKeepAliveLoop {
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param(
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[Parameter(Mandatory)]
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$Adapter
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)
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while ($true) {
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$mode = Get-CurrentMode -InterfaceIndex $Adapter.ifIndex
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$Global:isCustomGateway = $mode -eq "PROXY"
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$proxyHealthy = Test-ProxyHealthy
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if ($mode -eq "PROXY") {
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$internetOk = Test-InternetTcp
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if ($proxyHealthy -and $internetOk) {
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$Script:ProxyFailureCount = 0
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} else {
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$Script:ProxyFailureCount++
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Write-Log -Message "Proxy mode health failed $($Script:ProxyFailureCount)/$($Global:ProxyFailureThreshold)."
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}
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if ($Script:ProxyFailureCount -ge $Global:ProxyFailureThreshold -and (Test-CooldownExpired)) {
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Switch-ToDirect -InterfaceIndex $Adapter.ifIndex
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$Script:ProxyFailureCount = 0
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$Script:ProxySuccessCount = 0
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}
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} else {
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if ($proxyHealthy) {
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$Script:ProxySuccessCount++
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Write-Log -Message "Proxy mode candidate succeeded $($Script:ProxySuccessCount)/$($Global:ProxySuccessThreshold)."
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} else {
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$Script:ProxySuccessCount = 0
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}
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if ($Script:ProxySuccessCount -ge $Global:ProxySuccessThreshold -and (Test-CooldownExpired)) {
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Switch-ToProxy -InterfaceIndex $Adapter.ifIndex
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$Script:ProxySuccessCount = 0
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$Script:ProxyFailureCount = 0
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}
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}
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Start-Sleep -Seconds $Global:HealthCheckIntervalSeconds
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}
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}
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$adapter = Initialize-GatewayKeepAlive
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Start-GatewayKeepAliveLoop -Adapter $adapter
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@ -3,8 +3,15 @@ $Global:TestIP = "223.5.5.5" #测试是否连接网络
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$Global:originalDns = "223.5.5.5" #默认DNS
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$Global:originalGateway = "192.168.6.1" #默认网关
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$Global:CustomGateway = "192.168.6.2" #代理网关
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$Global:CustomIP = "192.168.6.4" #默认ip
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$Global:TargetNetworkAdapter = {} #网络适配器实例
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$Global:TargetNetworkAdapterKeyword = "Ethernet" #网络适配器名字通配符
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$Global:isCustomGateway = $false #是否为自定义网关
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$Global:isDebugging = $false #是否为调试模式（日志输出到控制台）
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$Global:ProxyPort = 1070 #代理网关SOCKS5检测端口
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$Global:UseSocksProxyHealthCheck = $true #是否检测SOCKS5代理端口
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$Global:DirectDnsServers = @() #直连模式DNS，留空表示恢复DHCP下发的DNS
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$Global:ProxySuccessThreshold = 3 #连续成功多少次后切换到代理网关
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$Global:ProxyFailureThreshold = 3 #连续失败多少次后切回默认网关
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$Global:HealthCheckIntervalSeconds = 5 #检测间隔
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$Global:SwitchCooldownSeconds = 30 #切换后的冷却时间
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@ -1,4 +1,4 @@
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. $(-Join($(Get-Location).Path, '\config.ps1'))
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. (Join-Path $PSScriptRoot 'config.ps1')
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function Write-Log {
|
||||
param (
|
||||
|
||||
@ -1,12 +1,13 @@
|
||||
. $(-Join($(Get-Location).Path, '\logger.ps1'))
|
||||
. $(-Join($(Get-Location).Path, '\config.ps1'))
|
||||
. (Join-Path $PSScriptRoot 'config.ps1')
|
||||
. (Join-Path $PSScriptRoot 'logger.ps1')
|
||||
|
||||
function Test-SocksProxy {
|
||||
param (
|
||||
[string]$ProxyHost,
|
||||
[int]$ProxyPort,
|
||||
[string]$TestHost = "google.com",
|
||||
[int]$TestPort = 443
|
||||
[int]$TestPort = 443,
|
||||
[int]$TimeoutMilliseconds = 1500
|
||||
)
|
||||
|
||||
$result = $false
|
||||
@ -22,7 +23,10 @@ function Test-SocksProxy {
|
||||
$tcpClient = New-Object System.Net.Sockets.TcpClient
|
||||
$tcpClient.SendTimeout = 1000
|
||||
$tcpClient.ReceiveTimeout = 1000
|
||||
$tcpClient.Connect($ProxyHost, $ProxyPort)
|
||||
$connectTask = $tcpClient.ConnectAsync($ProxyHost, $ProxyPort)
|
||||
if (-not $connectTask.Wait($TimeoutMilliseconds)) {
|
||||
throw "Timed out connecting to ${ProxyHost}:$ProxyPort."
|
||||
}
|
||||
|
||||
# 代理成功连接，开始验证目标地址是否可达
|
||||
$stream = $tcpClient.GetStream()
|
||||
@ -33,7 +37,10 @@ function Test-SocksProxy {
|
||||
|
||||
# 接收服务器响应
|
||||
$response = New-Object byte[] 2
|
||||
$stream.Read($response, 0, $response.Length)
|
||||
$bytesRead = $stream.Read($response, 0, $response.Length)
|
||||
if ($bytesRead -lt $response.Length) {
|
||||
throw "SOCKS handshake response is incomplete."
|
||||
}
|
||||
|
||||
if ($response[1] -ne 0x00) {
|
||||
throw "SOCKS handshake failed. Proxy does not support no-authentication."
|
||||
@ -55,7 +62,10 @@ function Test-SocksProxy {
|
||||
|
||||
# 接收连接响应
|
||||
$connectResponse = New-Object byte[] 10
|
||||
$stream.Read($connectResponse, 0, $connectResponse.Length)
|
||||
$bytesRead = $stream.Read($connectResponse, 0, $connectResponse.Length)
|
||||
if ($bytesRead -lt 2) {
|
||||
throw "SOCKS connect response is incomplete."
|
||||
}
|
||||
|
||||
if ($connectResponse[1] -eq 0x00) {
|
||||
Write-Log -Message "Proxy is valid and can connect to ${TestHost}:$TestPort."
|
||||
|
||||
Loading…
Reference in New Issue
Block a user