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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
package IceInternal;
public final class SOCKSNetworkProxy implements NetworkProxy
{
public SOCKSNetworkProxy(String host, int port)
{
_host = host;
_port = port;
}
private SOCKSNetworkProxy(java.net.InetSocketAddress address)
{
_address = address;
}
@Override
public void beginWrite(java.net.InetSocketAddress endpoint, Buffer buf)
{
final java.net.InetAddress addr = endpoint.getAddress();
if(addr == null)
{
throw new Ice.FeatureNotSupportedException("SOCKS4 does not support domain names");
}
else if(!(addr instanceof java.net.Inet4Address))
{
throw new Ice.FeatureNotSupportedException("SOCKS4 only supports IPv4 addresses");
}
//
// SOCKS connect request
//
buf.resize(9, false);
final java.nio.ByteOrder order = buf.b.order();
buf.b.order(java.nio.ByteOrder.BIG_ENDIAN); // Network byte order.
buf.position(0);
buf.b.put((byte)0x04); // SOCKS version 4.
buf.b.put((byte)0x01); // Command, establish a TCP/IP stream connection
buf.b.putShort((short)endpoint.getPort()); // Port
buf.b.put(addr.getAddress()); // IPv4 address
buf.b.put((byte)0x00); // User ID.
buf.position(0);
buf.limit(buf.size());
buf.b.order(order);
}
@Override
public int endWrite(Buffer buf)
{
// Once the request is sent, read the response
return buf.b.hasRemaining() ? SocketOperation.Write : SocketOperation.Read;
}
@Override
public void beginRead(Buffer buf)
{
//
// Read the SOCKS4 response whose size is 8 bytes.
//
if(!buf.b.hasRemaining())
{
buf.resize(8, true);
buf.position(0);
}
}
@Override
public int endRead(Buffer buf)
{
// We're done once we read the response
return buf.b.hasRemaining() ? SocketOperation.Read : SocketOperation.None;
}
@Override
public void finish(Buffer readBuffer, Buffer writeBuffer)
{
readBuffer.position(0);
byte b1 = readBuffer.b.get();
byte b2 = readBuffer.b.get();
if(b1 != 0x00 || b2 != 0x5a)
{
throw new Ice.ConnectFailedException();
}
}
@Override
public NetworkProxy resolveHost(int protocolSupport)
{
assert(_host != null);
return new SOCKSNetworkProxy(Network.getAddresses(_host,
_port,
protocolSupport,
Ice.EndpointSelectionType.Random,
false,
true).get(0));
}
@Override
public java.net.InetSocketAddress getAddress()
{
assert(_address != null); // Host must be resolved.
return _address;
}
@Override
public String getName()
{
return "SOCKS";
}
@Override
public int getProtocolSupport()
{
return Network.EnableIPv4;
}
private String _host;
private int _port;
private java.net.InetSocketAddress _address;
}
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