private async Task <(int port, PortStatus portStatus, Protocol protocol)> CheckPort(IPAddress ipAddr,
int port, int timeout = 3000)
{
while (true)
{
try
{
using var udpClient = new UdpClient();
udpClient.Connect(ipAddr, port);
for (var i = 0; i < 2; i++)
{
try
{
await udpClient.SendAsync(pakeges[i], pakeges[i].Length);
var count = await udpClient.ReceiveWithTimeoutAsync(timeout);
if (count.Status == TaskStatus.RanToCompletion)
{
foreach (var v in count.Result.Buffer)
{
Console.Write(v);
}
Console.WriteLine();
Console.WriteLine(port);
foreach (var v in pakeges[i])
{
Console.Write(v);
}
switch (i)
{
case 0:
return(port, PortStatus.OPEN, Protocol.DNS);
case 1:
return(port, PortStatus.OPEN, Protocol.NTP);
}
}
}
catch
{
// ignored
}
}
return(port, PortStatus.CLOSED, Protocol.UNDEFINED);
}
catch
{
// ignored
}
}
}