/// <summary>
/// Waits until the connected client sends a SOCKS5 request.
/// </summary>
/// <returns>The SOCKS5 request sent by the client.</returns>
/// <exception cref="Socks5Exception">The data sent by the client
/// is not a valid SOCKS5 request.</exception>
SocksRequest WaitForRequest()
{
ByteBuilder b = new ByteBuilder();
using (var r = new BinaryReader(stream, Encoding.UTF8, true)) {
byte[] bytes = r.ReadBytes(4);
b.Append(bytes);
ATyp atyp = (ATyp)bytes[3];
switch (atyp)
{
case ATyp.IPv4:
case ATyp.IPv6:
b.Append(r.ReadBytes(atyp == ATyp.IPv4 ? 4 : 16));
break;
case ATyp.Domain:
byte length = r.ReadByte();
b.Append(length).Append(r.ReadBytes(length));
break;
}
b.Append(r.ReadBytes(2));
}
try {
return(SocksRequest.Deserialize(b.ToArray()));
} catch (Exception e) {
throw new Socks5Exception("The request could not be serialized.", e);
}
}
/// <summary>
/// Performs the specified SOCKS5 request.
/// </summary>
/// <param name="request">The SOCKS5 request to issue to the server.</param>
/// <returns>The SOCKS5 reply sent by the server.</returns>
/// <exception cref="ArgumentNullException">The request parameter is
/// null.</exception>
/// <exception cref="ObjectDisposedException">The object has been
/// disposed.</exception>
/// <exception cref="Socks5Exception">The request could not be performed.
/// Consult the InnerException property of the Socks5Exception to learn
/// the reason.</exception>
public SocksReply Request(SocksRequest request)
{
request.ThrowIfNull("request");
AssertValid();
try {
byte[] bytes = request.Serialize();
stream.Write(bytes, 0, bytes.Length);
ByteBuilder b = new ByteBuilder();
using (var r = new BinaryReader(stream, Encoding.UTF8, true)) {
bytes = r.ReadBytes(4);
b.Append(bytes);
ATyp atyp = (ATyp)bytes[3];
switch (atyp)
{
case ATyp.IPv4:
case ATyp.IPv6:
b.Append(r.ReadBytes(atyp == ATyp.IPv4 ? 4 : 16));
break;
case ATyp.Domain:
byte length = r.ReadByte();
b.Append(length).Append(r.ReadBytes(length));
break;
}
b.Append(r.ReadBytes(2));
}
return(SocksReply.Deserialize(b.ToArray()));
} catch (Exception e) {
throw new Socks5Exception("The request could not be performed.", e);
}
}
public byte[] Serialize()
{
ByteBuilder b = new ByteBuilder()
.Append(version)
.Append((byte)methods.Count);
foreach (AuthMethod m in Methods)
{
b.Append((byte)m);
}
return(b.ToArray());
}
private void PerformGreeting()
{
ByteBuilder builder = new ByteBuilder();
using (BinaryReader reader = new BinaryReader(this.stream, Encoding.UTF8))
{
byte[] values = reader.ReadBytes(2);
builder.Append(values);
builder.Append(reader.ReadBytes(values[1]));
}
if (!ClientGreeting.Deserialize(builder.ToArray()).Methods.Contains <AuthMethod>(AuthMethod.None))
{
this.Dispose();
throw new Socks5Exception("Client requires authentication.");
}
byte[] buffer2 = new ServerGreeting(AuthMethod.None).Serialize();
this.stream.Write(buffer2, 0, buffer2.Length);
}
public SocksReply Request(SocksRequest request)
{
SocksReply reply;
request.ThrowIfNull <SocksRequest>("request");
this.AssertValid();
try
{
byte[] buffer = request.Serialize();
this.stream.Write(buffer, 0, buffer.Length);
ByteBuilder builder = new ByteBuilder();
BinaryReader reader = new BinaryReader(this.stream, Encoding.UTF8);
buffer = reader.ReadBytes(4);
builder.Append(buffer);
ATyp typ = (ATyp)buffer[3];
switch (typ)
{
case ATyp.IPv4:
case ATyp.IPv6:
builder.Append(reader.ReadBytes((typ == ATyp.IPv4) ? 4 : 0x10));
break;
case ATyp.Domain:
{
byte count = reader.ReadByte();
builder.Append(new byte[] { count }).Append(reader.ReadBytes(count));
break;
}
}
builder.Append(reader.ReadBytes(2));
reply = SocksReply.Deserialize(builder.ToArray());
}
catch (Exception exception)
{
CommonConfig.Logger.WriteError("The request could not be performed.", exception);
throw new Socks5Exception("The request could not be performed.", exception);
}
return(reply);
}
/// <summary>
/// Performs the initial greeting.
/// </summary>
/// <exception cref="Socks5Exception">The client sent invalid data, or
/// requires authentication.</exception>
/// <exception cref="IOException">The stream could not be read, or the
/// operation timed out.</exception>
void PerformGreeting()
{
ByteBuilder b = new ByteBuilder();
using (var r = new BinaryReader(stream, Encoding.UTF8, true)) {
byte[] bytes = r.ReadBytes(2);
b.Append(bytes);
// The number of method-bytes following is contained in the second byte.
b.Append(r.ReadBytes(bytes[1]));
}
ClientGreeting greeting = ClientGreeting.Deserialize(b.ToArray());
// We only accept an authentication method of 'none'.
if (!greeting.Methods.Contains(AuthMethod.None))
{
Dispose();
throw new Socks5Exception("Client requires authentication.");
}
// Send back our greeting response.
var response = new ServerGreeting(AuthMethod.None).Serialize();
stream.Write(response, 0, response.Length);
}
private SocksRequest WaitForRequest()
{
SocksRequest request;
ByteBuilder builder = new ByteBuilder();
using (BinaryReader reader = new BinaryReader(this.stream, Encoding.UTF8))
{
byte[] values = reader.ReadBytes(4);
builder.Append(values);
ATyp typ = (ATyp)values[3];
switch (typ)
{
case ATyp.IPv4:
case ATyp.IPv6:
builder.Append(reader.ReadBytes((typ == ATyp.IPv4) ? 4 : 0x10));
break;
case ATyp.Domain:
{
byte count = reader.ReadByte();
builder.Append(new byte[] { count }).Append(reader.ReadBytes(count));
break;
}
}
builder.Append(reader.ReadBytes(2));
}
try
{
request = SocksRequest.Deserialize(builder.ToArray());
}
catch (Exception exception)
{
throw new Socks5Exception("The request could not be serialized.", exception);
}
return(request);
}
