powershell验证ntpserver udp协议123端口的连通性

Test-NetConnection -ComputerName 169.254.10.10 -Port 80 -InformationLevel Detailed

w32tm /stripchart /computer:ntp.tencent.com /dataonly /samples:1

param(
    [Parameter(Mandatory=$false)]
    [string]$Server = "ntp.aliyun.com",
    [Parameter(Mandatory=$false)]
    [int]$Port = 123,
    [Parameter(Mandatory=$false)]
    [int]$TimeoutMs = 2000
)

function Test-UdpNtp {
    param(
        [string]$Server,
        [int]$Port = 123,
        [int]$TimeoutMs = 2000
    )

    # Build minimal NTP request packet: 48 bytes, first byte 0x1B (LI=0, VN=3, Mode=3)
    $packet = New-Object byte[] 48
    $packet[0] = 0x1B

    $udp = $null
    try {
        $udp = [System.Net.Sockets.UdpClient]::new()
        $udp.Client.ReceiveTimeout = $TimeoutMs

        # Connect sets default remote endpoint (no TCP-style handshake)
        $udp.Connect($Server, $Port)

        # Send NTP request
        [void]$udp.Send($packet, $packet.Length)

        # Receive response
        $remoteEP = [System.Net.IPEndPoint]::new([System.Net.IPAddress]::Any, 0)
        $response = $udp.Receive([ref]$remoteEP)

        if ($response -and $response.Length -ge 48) {
            return @{
                Reachable = $true
                Server = $Server
                Port = $Port
                RemoteAddress = $remoteEP.Address.ToString()
                RemotePort = $remoteEP.Port
                ResponseLength = $response.Length
                Message = "UDP reachable, NTP response received"
            }
        } else {
            return @{
                Reachable = $false
                Server = $Server
                Port = $Port
                Message = "Received data with unexpected length: $($response.Length)"
            }
        }
    }
    catch [System.Net.Sockets.SocketException] {
        return @{
            Reachable = $false
            Server = $Server
            Port = $Port
            Error = $_.Exception.Message
            Message = "No response or network error (timeout/firewall/packet drop)"
        }
    }
    catch {
        return @{
            Reachable = $false
            Server = $Server
            Port = $Port
            Error = $_.Exception.Message
            Message = "Unknown error occurred"
        }
    }
    finally {
        if ($udp) { $udp.Close() }
    }
}

# Execute test and print result
$result = Test-UdpNtp -Server $Server -Port $Port -TimeoutMs $TimeoutMs
if ($result.Reachable) {
    Write-Host "[OK] $($result.Message): $($result.Server):$($result.Port) from $($result.RemoteAddress):$($result.RemotePort), response length $($result.ResponseLength) bytes" -ForegroundColor Green
    exit 0
} else {
    if ($result.Error) {
        Write-Host "[FAIL] $($result.Message): $($result.Server):$($result.Port) error: $($result.Error)" -ForegroundColor Red
    } else {
        Write-Host "[FAIL] $($result.Message): $($result.Server):$($result.Port)" -ForegroundColor Red
    }
    exit 2
}