122 lines
4.5 KiB
Java
122 lines
4.5 KiB
Java
package eu.siacs.conversations.utils;
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import com.google.common.io.ByteStreams;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.net.Socket;
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import java.nio.ByteBuffer;
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import eu.siacs.conversations.Config;
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public class SocksSocketFactory {
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private static final byte[] LOCALHOST = new byte[]{127, 0, 0, 1};
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public static void createSocksConnection(final Socket socket, final String destination, final int port) throws IOException {
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//TODO use different Socks Addr Type if destination is IP or IPv6
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final InputStream proxyIs = socket.getInputStream();
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final OutputStream proxyOs = socket.getOutputStream();
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proxyOs.write(new byte[]{0x05, 0x01, 0x00});
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proxyOs.flush();
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final byte[] handshake = new byte[2];
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ByteStreams.readFully(proxyIs, handshake);
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if (handshake[0] != 0x05 || handshake[1] != 0x00) {
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throw new SocksConnectionException("Socks 5 handshake failed");
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}
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final byte[] dest = destination.getBytes();
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final ByteBuffer request = ByteBuffer.allocate(7 + dest.length);
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request.put(new byte[]{0x05, 0x01, 0x00, 0x03});
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request.put((byte) dest.length);
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request.put(dest);
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request.putShort((short) port);
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proxyOs.write(request.array());
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proxyOs.flush();
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final byte[] response = new byte[4];
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ByteStreams.readFully(proxyIs, response);
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final byte ver = response[0];
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if (ver != 0x05) {
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throw new IOException(String.format("Unknown Socks version %02X ", ver));
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}
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final byte status = response[1];
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final byte bndAddrType = response[3];
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final byte[] bndDestination = readDestination(bndAddrType, proxyIs);
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final byte[] bndPort = new byte[2];
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if (bndAddrType == 0x03) {
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final String receivedDestination = new String(bndDestination);
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if (!receivedDestination.equalsIgnoreCase(destination)) {
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throw new IOException(String.format("Destination mismatch. Received %s Expected %s", receivedDestination, destination));
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}
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}
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ByteStreams.readFully(proxyIs, bndPort);
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if (status != 0x00) {
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if (status == 0x04) {
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throw new HostNotFoundException("Host unreachable");
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}
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if (status == 0x05) {
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throw new HostNotFoundException("Connection refused");
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}
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throw new IOException(String.format("Unknown status code %02X ", status));
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}
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}
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private static byte[] readDestination(final byte type, final InputStream inputStream) throws IOException {
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final byte[] bndDestination;
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if (type == 0x01) {
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bndDestination = new byte[4];
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} else if (type == 0x03) {
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final int length = inputStream.read();
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bndDestination = new byte[length];
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} else if (type == 0x04) {
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bndDestination = new byte[16];
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} else {
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throw new IOException(String.format("Unknown Socks address type %02X ", type));
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}
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ByteStreams.readFully(inputStream, bndDestination);
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return bndDestination;
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}
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public static boolean contains(byte needle, byte[] haystack) {
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for (byte hay : haystack) {
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if (hay == needle) {
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return true;
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}
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}
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return false;
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}
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private static Socket createSocket(InetSocketAddress address, String destination, int port) throws IOException {
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Socket socket = new Socket();
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try {
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socket.connect(address, Config.CONNECT_TIMEOUT * 1000);
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} catch (IOException e) {
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throw new SocksProxyNotFoundException();
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}
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createSocksConnection(socket, destination, port);
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return socket;
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}
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public static Socket createSocketOverTor(String destination, int port) throws IOException {
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return createSocket(new InetSocketAddress(InetAddress.getByAddress(LOCALHOST), 9050), destination, port);
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}
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private static class SocksConnectionException extends IOException {
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SocksConnectionException(String message) {
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super(message);
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}
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}
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public static class SocksProxyNotFoundException extends IOException {
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}
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public static class HostNotFoundException extends SocksConnectionException {
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HostNotFoundException(String message) {
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super(message);
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}
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}
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}
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