private async Task DoConnectAsync(NetworkStream localStream, HttpRequest httpRequest)
{
string host;
int port;
{
string[] parts = httpRequest.RequestPath.Split(':');
host = parts[0];
if (parts.Length > 1)
{
port = int.Parse(parts[1]);
}
else
{
port = 80;
}
}
//connect to remote server
_remoteSocket = await _connectionManager.ConnectAsync(EndPointExtension.GetEndPoint(host, port));
//signal client 200 OK
await localStream.WriteAsync(Encoding.ASCII.GetBytes(httpRequest.Protocol + " 200 OK\r\nConnection: close\r\n\r\n"));
//pipe sockets
_ = _localSocket.CopyToAsync(_remoteSocket).ContinueWith(delegate(Task prevTask) { Dispose(); });
_ = _remoteSocket.CopyToAsync(_localSocket).ContinueWith(delegate(Task prevTask) { Dispose(); });
}
public static NetProxy CreateProxy(NetProxyType type, string address, int port, NetworkCredential credential = null)
{
switch (type)
{
case NetProxyType.Http:
return(new HttpProxy(EndPointExtension.GetEndPoint(address, port), credential));
case NetProxyType.Socks5:
return(new SocksProxy(EndPointExtension.GetEndPoint(address, port), credential));
default:
throw new NotSupportedException("Proxy type not supported.");
}
}
public static NetProxy CreateSystemHttpProxy()
{
IWebProxy proxy = WebRequest.DefaultWebProxy;
if (proxy == null)
{
return(null); //no proxy configured
}
Uri testUri = new Uri("https://www.google.com/");
if (proxy.IsBypassed(testUri))
{
return(null); //no proxy configured
}
Uri proxyAddress = proxy.GetProxy(testUri);
if (proxyAddress.Equals(testUri))
{
return(null); //no proxy configured
}
return(new HttpProxy(EndPointExtension.GetEndPoint(proxyAddress.Host, proxyAddress.Port), proxy.Credentials.GetCredential(proxyAddress, "BASIC")));
}
public async Task StartAsync()
{
bool dontDispose = false;
try
{
NetworkStream localStream = new NetworkStream(_localSocket);
Stream remoteStream = null;
string lastHost = null;
int lastPort = 0;
while (true)
{
HttpRequest httpRequest;
{
Task <HttpRequest> task = HttpRequest.ReadRequestAsync(localStream);
using (CancellationTokenSource timeoutCancellationTokenSource = new CancellationTokenSource())
{
if (await Task.WhenAny(task, Task.Delay(CLIENT_REQUEST_TIMEOUT, timeoutCancellationTokenSource.Token)) != task)
{
return; //request timed out
}
timeoutCancellationTokenSource.Cancel(); //cancel delay task
}
httpRequest = await task;
}
if (httpRequest == null)
{
return; //connection closed gracefully by client
}
if (_authenticationManager != null)
{
string proxyAuth = httpRequest.Headers[HttpRequestHeader.ProxyAuthorization];
if (string.IsNullOrEmpty(proxyAuth))
{
await SendResponseAsync(407, "<h1>Proxy Authentication Required</h1>");
return;
}
string username;
string password;
{
string[] parts = proxyAuth.Split(new char[] { ' ' }, 2);
if (!parts[0].Equals("BASIC", StringComparison.OrdinalIgnoreCase) || (parts.Length < 2))
{
await SendResponseAsync(407, "<h1>Proxy Authentication Required</h1><p>Proxy authentication method is not supported.</p>");
return;
}
string[] credParts = Encoding.ASCII.GetString(Convert.FromBase64String(parts[1])).Split(new char[] { ':' }, 2);
if (credParts.Length != 2)
{
await SendResponseAsync(407, "<h1>Proxy Authentication Required</h1><p>Proxy authentication method is not supported.</p>");
return;
}
username = credParts[0];
password = credParts[1];
}
if (!_authenticationManager.Authenticate(username, password))
{
await SendResponseAsync(407, "<h1>Proxy Authentication Required</h1><p>Invalid username or password.</p>");
return;
}
}
if (httpRequest.HttpMethod.Equals("CONNECT", StringComparison.OrdinalIgnoreCase))
{
await DoConnectAsync(localStream, httpRequest);
dontDispose = true;
break;
}
else
{
#region connect to remote server
string host;
int port;
string requestPathAndQuery;
if (Uri.TryCreate(httpRequest.RequestPathAndQuery, UriKind.Absolute, out Uri requestUri))
{
host = requestUri.Host;
port = requestUri.Port;
requestPathAndQuery = requestUri.PathAndQuery;
}
else
{
string hostHeader = httpRequest.Headers[HttpRequestHeader.Host];
if (string.IsNullOrEmpty(hostHeader))
{
throw new HttpProxyServerException("Invalid proxy request.");
}
string[] parts = hostHeader.Split(':');
host = parts[0];
if (parts.Length > 1)
{
port = int.Parse(parts[1]);
}
else
{
port = 80;
}
requestPathAndQuery = httpRequest.RequestPathAndQuery;
}
if (!host.Equals(lastHost) || port != lastPort || !_remoteSocket.Connected)
{
if (_remoteSocket != null)
{
if (_remoteSocket.Connected)
{
try
{
_remoteSocket.Shutdown(SocketShutdown.Both);
}
catch
{ }
}
_remoteSocket.Dispose();
}
_remoteSocket = await _connectionManager.ConnectAsync(EndPointExtension.GetEndPoint(host, port));
remoteStream = new WriteBufferedStream(new NetworkStream(_remoteSocket), 512);
lastHost = host;
lastPort = port;
//pipe response stream
_ = _remoteSocket.CopyToAsync(_localSocket).ContinueWith(delegate(Task prevTask) { Dispose(); });
}
#endregion
#region relay client request to server
foreach (string header in httpRequest.Headers.AllKeys)
{
if (header.StartsWith("Proxy-", StringComparison.OrdinalIgnoreCase))
{
httpRequest.Headers.Remove(header);
}
}
await remoteStream.WriteAsync(Encoding.ASCII.GetBytes(httpRequest.HttpMethod + " " + requestPathAndQuery + " " + httpRequest.Protocol + "\r\n"));
await remoteStream.WriteAsync(httpRequest.Headers.ToByteArray());
if (httpRequest.InputStream != null)
{
await httpRequest.InputStream.CopyToAsync(remoteStream);
}
await remoteStream.FlushAsync();
#endregion
}
}
}
catch (Exception ex)
{
await SendResponseAsync(ex);
}
finally
{
if (!dontDispose)
{
Dispose();
}
}
}
public static NetProxy CreateHttpProxy(string address, int port = 8080, NetworkCredential credential = null)
{
return(new HttpProxy(EndPointExtension.GetEndPoint(address, port), credential));
}
public Task <TunnelProxy> CreateTunnelProxyAsync(string address, int port, bool enableSsl = false, bool ignoreCertificateErrors = false)
{
return(CreateTunnelProxyAsync(EndPointExtension.GetEndPoint(address, port), enableSsl, ignoreCertificateErrors));
}
public async Task <Socket> ConnectAsync(string address, int port)
{
return(await ConnectAsync(EndPointExtension.GetEndPoint(address, port)));
}
public bool IsBypassed(Uri host)
{
return(IsBypassed(EndPointExtension.GetEndPoint(host.Host, host.Port)));
}
public new async Task SendMailAsync(MailMessage message)
{
if (_disposed)
{
throw new ObjectDisposedException("SmtpClientEx");
}
if (message.To.Count == 0)
{
throw new ArgumentException("Message does not contain receipent email address.");
}
if (DeliveryMethod == SmtpDeliveryMethod.Network)
{
string host = _host;
if (string.IsNullOrEmpty(host))
{
//resolve MX for the receipent domain using IDnsClient
if (_dnsClient == null)
{
_dnsClient = new DnsClient()
{
Proxy = _proxy
}
}
;
IReadOnlyList <string> mxDomains = await Dns.DnsClient.ResolveMXAsync(_dnsClient, message.To[0].Host);
if (mxDomains.Count > 0)
{
host = mxDomains[0];
}
else
{
host = message.To[0].Host;
}
_port = 25;
Credentials = null;
}
if (_proxy == null)
{
if (_smtpOverTls)
{
EndPoint remoteEP = EndPointExtension.GetEndPoint(host, _port);
if ((_tunnelProxy != null) && !_tunnelProxy.RemoteEndPoint.Equals(remoteEP))
{
_tunnelProxy.Dispose();
_tunnelProxy = null;
}
if ((_tunnelProxy == null) || _tunnelProxy.IsBroken)
{
_tunnelProxy = await TunnelProxy.CreateTunnelProxyAsync(remoteEP, true, _ignoreCertificateErrors);
}
base.Host = _tunnelProxy.TunnelEndPoint.Address.ToString();
base.Port = _tunnelProxy.TunnelEndPoint.Port;
}
else
{
base.Host = host;
base.Port = _port;
}
await base.SendMailAsync(message);
}
else
{
EndPoint remoteEP = EndPointExtension.GetEndPoint(host, _port);
if ((_tunnelProxy != null) && !_tunnelProxy.RemoteEndPoint.Equals(remoteEP))
{
_tunnelProxy.Dispose();
_tunnelProxy = null;
}
if ((_tunnelProxy == null) || _tunnelProxy.IsBroken)
{
_tunnelProxy = await _proxy.CreateTunnelProxyAsync(remoteEP, _smtpOverTls, _ignoreCertificateErrors);
}
base.Host = _tunnelProxy.TunnelEndPoint.Address.ToString();
base.Port = _tunnelProxy.TunnelEndPoint.Port;
await base.SendMailAsync(message);
}
}
else
{
await base.SendMailAsync(message);
}
}
public new async Task SendMailAsync(MailMessage message)
{
if (_disposed)
{
throw new ObjectDisposedException("SmtpClientEx");
}
if (DeliveryMethod == SmtpDeliveryMethod.Network)
{
if (string.IsNullOrEmpty(_host))
{
if (_dnsClient == null)
{
_dnsClient = new DnsClient();
}
IReadOnlyList <string> mxServers = await _dnsClient.ResolveMXAsync(message.To[0].Host);
if (mxServers.Count > 0)
{
_host = mxServers[0];
}
else
{
_host = message.To[0].Host;
}
_port = 25;
Credentials = null;
}
if (_proxy == null)
{
if (_enableSslWrapper)
{
EndPoint remoteEP = EndPointExtension.GetEndPoint(_host, _port);
if ((_tunnelProxy != null) && !_tunnelProxy.RemoteEndPoint.Equals(remoteEP))
{
_tunnelProxy.Dispose();
_tunnelProxy = null;
}
if ((_tunnelProxy == null) || _tunnelProxy.IsBroken)
{
IPEndPoint ep = await remoteEP.GetIPEndPointAsync();
Socket socket = new Socket(ep.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
await socket.ConnectAsync(ep);
_tunnelProxy = new TunnelProxy(socket, remoteEP, _enableSslWrapper, _ignoreCertificateErrors);
}
base.Host = _tunnelProxy.TunnelEndPoint.Address.ToString();
base.Port = _tunnelProxy.TunnelEndPoint.Port;
}
else
{
base.Host = _host;
base.Port = _port;
}
await base.SendMailAsync(message);
}
else
{
EndPoint remoteEP = EndPointExtension.GetEndPoint(_host, _port);
if ((_tunnelProxy != null) && !_tunnelProxy.RemoteEndPoint.Equals(remoteEP))
{
_tunnelProxy.Dispose();
_tunnelProxy = null;
}
if ((_tunnelProxy == null) || _tunnelProxy.IsBroken)
{
_tunnelProxy = await _proxy.CreateTunnelProxyAsync(remoteEP, _enableSslWrapper, _ignoreCertificateErrors);
}
base.Host = _tunnelProxy.TunnelEndPoint.Address.ToString();
base.Port = _tunnelProxy.TunnelEndPoint.Port;
await base.SendMailAsync(message);
}
}
else
{
await base.SendMailAsync(message);
}
}
