/// <summary>
/// Begins an asynchronous request for a remote host connection.
/// </summary>
/// <param name="host">The host address to connect to.</param>
/// <param name="port">The port number to connect to.</param>
/// <param name="callback">The <see cref="T:System.AsyncCallback" /> delegate.</param>
/// <param name="state">An object that contains state information for this request.</param>
/// <returns>
/// An <see cref="T:System.IAsyncResult" /> that references the asynchronous connection.
/// </returns>
public new IAsyncResult BeginConnect(string host, int port, AsyncCallback callback, object state)
{
if (host == null)
{
throw new ArgumentNullException("host");
}
if (callback == null)
{
throw new ArgumentNullException("callback");
}
connectCallback = callback;
if (proxyAddress == null || proxyPort == -1)
{
return(BeginDNSResolve(host, port, callback, state));
}
else
{
processor = new Socks5Processor(this);
asyncResult = processor.BeginProcessing(host, port, OnConnectionEstablished);
return(asyncResult);
}
}
/// <summary>
/// Begins an asynchronous request for a remote host connection.
/// </summary>
/// <param name="remoteEP">An <see cref="T:System.Net.EndPoint" /> that represents the remote host.</param>
/// <param name="callback">The <see cref="T:System.AsyncCallback" /> delegate.</param>
/// <param name="state">An object that contains state information for this request.</param>
/// <returns>
/// An <see cref="T:System.IAsyncResult" /> that references the asynchronous connection.
/// </returns>
/// <PermissionSet>
/// <IPermission class="System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// <IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// <IPermission class="System.Diagnostics.PerformanceCounterPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// <IPermission class="System.Net.SocketPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// </PermissionSet>
public new IAsyncResult BeginConnect(EndPoint remoteEP, AsyncCallback callback, object state)
{
if (remoteEP == null)
{
throw new ArgumentNullException("remoteEP");
}
if (callback == null)
{
throw new ArgumentNullException("callback");
}
if (proxyAddress == null || proxyPort == -1)
{
return(base.BeginConnect(remoteEP, callback, state));
}
else
{
connectCallback = callback;
processor = new Socks5Processor(this);
asyncResult = processor.BeginProcessing((IPEndPoint)remoteEP, OnConnectionEstablished);
return(asyncResult);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="ForwardSocket"/> class.
/// </summary>
/// <param name="client">The client hosting the proxy connection.</param>
/// <param name="connection">The connection associated with the originating client connection.</param>
public ForwardSocket(Client client, Connection connection) : base(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
{
this.asyncResult = null;
this.client = client;
this.connectCallback = null;
this.processor = null;
this.proxyAddress = null;
this.proxyPort = -1;
}
/// <summary>
/// Initializes a new instance of the <see cref="Socks5Processor"/> class.
/// </summary>
/// <param name="socket">The socket which is connected to the proxy network.</param>
public Socks5Processor(ForwardSocket socket)
{
this.asyncResult = new Socks5AsyncResult();
this.buffer = new byte[512];
this.endAddress = null;
this.endPoint = null;
this.endPort = 0;
this.finalLength = 0;
this.socket = socket;
}
/// <summary>
/// Establishes a connection to a remote host.
/// </summary>
/// <param name="remoteEP">An <see cref="T:System.Net.EndPoint" /> that represents the remote device.</param>
/// <PermissionSet>
/// <IPermission class="System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// <IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// <IPermission class="System.Diagnostics.PerformanceCounterPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// <IPermission class="System.Net.SocketPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// </PermissionSet>
public new void Connect(EndPoint remoteEP)
{
if (remoteEP == null)
{
throw new ArgumentNullException("remoteEP");
}
if (proxyAddress == null || proxyPort == -1)
{
base.Connect(remoteEP);
}
else
{
processor = new Socks5Processor(this);
asyncResult = processor.BeginProcessing((IPEndPoint)remoteEP, OnConnectionEstablished);
asyncResult.AsyncWaitHandle.WaitOne();
}
}
/// <summary>
/// Begins an asynchronous request to resolve the DNS information for a host.
/// </summary>
/// <param name="host">The host address to resolve.</param>
/// <param name="port">The port number of the associated host.</param>
/// <returns>An <see cref="T:System.IAsyncResult" /> that references the asynchronous request.</returns>
private IAsyncResult BeginDNSResolve(string host, int port, AsyncCallback callback, object state)
{
DNSResolveState dnsState;
try
{
dnsState = new DNSResolveState();
dnsState.Callback = callback;
dnsState.Host = host;
dnsState.Port = port;
dnsState.State = state;
asyncResult = new Socks5AsyncResult();
Dns.BeginGetHostEntry(host, OnDnsGetHostEntry, dnsState);
return(asyncResult);
}
catch (Exception exception)
{
throw new TorException("The forwarding socket failed to resolve a host address", exception);
}
}
