1 files changed, 110 insertions, 0 deletions
diff --git a/src/org/noreply/fancydress/type3/routing/RoutingIP4.java b/src/org/noreply/fancydress/type3/routing/RoutingIP4.java
new file mode 100644
index 0000000..05d65ee
--- /dev/null
+++ b/src/org/noreply/fancydress/type3/routing/RoutingIP4.java
@@ -0,0 +1,110 @@
+package org.noreply.fancydress.type3.routing;
+
+import org.noreply.fancydress.misc.Util;
+import org.noreply.fancydress.crypto.*;
+import java.net.InetAddress;
+import java.net.Inet4Address;
+
+/**
+ * The FWD/IP4 and SWAP-FWD/IP4 routing as specified in the type III spec.
+ *
+ * FWD/IP4 packets are forwarded to another type III node given by
+ * an ip/port pair.
+ *
+ * This routing type is going to go away RSN.  FIXME
+ */
+public class RoutingIP4 extends RoutingForward {
+	/**
+	 * The IP address of the next hop
+	 */
+	private InetAddress ip;
+	/**
+	 * Port at which the Type III server is listening
+	 */
+	private int port;
+	/**
+	 * Keyid of the next hop's Packet Key
+	 */
+	private byte[] keyid;
+
+	/**
+	 * Constructor that creates the routing as either FWD/IP4 or SWAP-FWD/IP4
+	 *
+	 * @param ip IP address of the next hop
+	 * @param port TCP port at which the next hop is listening
+	 * @param keyid keyid of the packet key
+	 * @param boolean if true, have a SWAP-FWD/IP4 routing type, FWD/IP4 otherwhise
+	 */
+	private RoutingIP4(InetAddress ip, int port, byte[] keyid, boolean asSwap) {
+		super (asSwap ? RoutingType.SWAP_FWD_IP4 : RoutingType.FWD_IP4);
+
+		if (keyid.length != CryptoPrimitives.HASH_LEN)
+			throw new Error("keyid must be HASH_LEN bytes long.");
+		if (! (ip instanceof Inet4Address))
+			throw new Error("IP must be an instance of Inet4Address.");
+
+		this.ip = ip;
+		this.port = port;
+		this.keyid = keyid;
+	}
+
+	/**
+	 * Create a FWD/IP4 routing.
+	 *
+	 * @param ip IP address of the next hop 
+	 * @param port TCP port at which the next hop is listening
+	 * @param keyid keyid of the packet key
+	 */
+	public RoutingIP4(InetAddress ip, int port, byte[] keyid) {
+		this(ip, port, keyid, false);
+	}
+
+	/**
+	 * Return a routing with the same information but with a SWAP_FWD_IP4 routing type.
+	 *
+	 * @return a SWAP_FWD_IP4 routing.
+	 */
+	public RoutingForward asSwap() {
+		RoutingIP4 swap = new RoutingIP4(ip, port, keyid, true);
+		return swap;
+	}
+
+	/**
+	 * Return the total length in octets of the routing information.
+	 *
+	 * @return total length in octets of the routing information
+	 */
+	public int getRoutingInformationLength() {
+		return 4 + 2 + keyid.length;
+	}
+
+	/**
+	 * Get the routing type of this instance.
+	 *
+	 * @return routing type
+	 */
+	public byte[] getRoutingInformation() {
+		int length = getRoutingInformationLength();
+		byte[] result = new byte[length];
+		byte[] address = ip.getAddress();
+		int pos = 0;
+
+		if (address.length != 4)
+			throw new Error("Expected 4 bytes from ip.getAddress().");
+
+		System.arraycopy(address, 0, result, pos, address.length);
+		pos += address.length;
+		result[pos] = (byte) ( (port >> 8) & 0xff);
+		pos++;
+		result[pos] = (byte) (  port       & 0xff);
+		pos++;
+		System.arraycopy(keyid, 0, result, pos, keyid.length);
+		pos += keyid.length;
+
+		if (pos != length)
+			throw new Error("Did not fill in expected amount of bytes!");
+
+		return result;
+	}
+}
+