public async Task<bool> IsPortReachable(string host, int port = 80, int msTimeout = 5000)
{
return await Task.Run(async () =>
{
var sockaddr = new InetSocketAddress(host, port);
using (var sock = new Socket())
{
try
{
await sock.ConnectAsync(sockaddr, msTimeout);
return true;
}
catch (Exception)
{
return false;
}
}
});
}
/// <summary>
/// Tests if a remote host name is reachable
/// </summary>
/// <param name="host">Host name can be a remote IP or URL of website (no http:// or www.)</param>
/// <param name="port">Port to attempt to check is reachable.</param>
/// <param name="msTimeout">Timeout in milliseconds.</param>
/// <returns></returns>
public override async Task<bool> IsRemoteReachable(string host, int port = 80, int msTimeout = 5000)
{
if (string.IsNullOrEmpty(host))
throw new ArgumentNullException("host");
if (!IsConnected)
return false;
host = host.Replace("http://www.", string.Empty).
Replace("http://", string.Empty).
Replace("https://www.", string.Empty).
Replace("https://", string.Empty);
return await Task.Run(async () =>
{
try
{
var sockaddr = new InetSocketAddress(host, port);
using (var sock = new Socket())
{
await sock.ConnectAsync(sockaddr, msTimeout);
return true;
}
}
catch (Exception ex)
{
Debug.WriteLine("Unable to reach: " + host + " Error: " + ex);
return false;
}
});
}
/// <summary>
/// Tests if a remote host name is reachable
/// </summary>
/// <param name="host">Host name can be a remote IP or URL of website (no http:// or www.)</param>
/// <param name="port">Port to attempt to check is reachable.</param>
/// <param name="msTimeout">Timeout in milliseconds.</param>
/// <returns></returns>
public override async Task<bool> IsRemoteReachable(string host, int port = 80, int msTimeout = 5000)
{
if (string.IsNullOrEmpty(host))
throw new ArgumentNullException("host");
if (!IsConnected)
return false;
host = host.Replace("http://www.", string.Empty).
Replace("http://", string.Empty).
Replace("https://www.", string.Empty).
Replace("https://", string.Empty);
return await Task.Run(async () =>
{
try
{
var tcs = new TaskCompletionSource<InetSocketAddress>();
new System.Threading.Thread(async () =>
{
/* this line can take minutes when on wifi with poor or none internet connectivity
and Task.Delay solves it only if this is running on new thread (Task.Run does not help) */
InetSocketAddress result = new InetSocketAddress(host, port);
if (!tcs.Task.IsCompleted)
tcs.TrySetResult(result);
}).Start();
Task.Run(async () =>
{
await Task.Delay(msTimeout);
if (!tcs.Task.IsCompleted)
tcs.TrySetResult(null);
});
var sockaddr = await tcs.Task;
if (sockaddr == null)
return false;
using (var sock = new Socket())
{
await sock.ConnectAsync(sockaddr, msTimeout);
return true;
}
}
catch (Exception ex)
{
Debug.WriteLine("Unable to reach: " + host + " Error: " + ex);
return false;
}
});
}