1 files changed, 102 insertions, 0 deletions
diff --git a/src/org/noreply/fancydress/type3/routing/RoutingHOST.java b/src/org/noreply/fancydress/type3/routing/RoutingHOST.java
new file mode 100644
index 0000000..f950e76
--- /dev/null
+++ b/src/org/noreply/fancydress/type3/routing/RoutingHOST.java
@@ -0,0 +1,102 @@
+package org.noreply.fancydress.type3.routing;
+
+import org.noreply.fancydress.misc.Util;
+import org.noreply.fancydress.crypto.*;
+
+/**
+ * The FWD/HOST and SWAP-FWD/HOST routing as specified in the type III spec.
+ *
+ * FWD/HOST packets are forwarded to another type III node given by
+ * a hostname/port pair.  The delivering node (i.e. the node parsing
+ * this routing type) is responsible for resolving the hostname to an
+ * IP address.
+ */
+public class RoutingHOST extends RoutingForward {
+	/**
+	 * The hostname of the next hop
+	 */
+	private String hostname;
+	/**
+	 * Port at which the Type III server is listening
+	 */
+	private int port;
+	/**
+	 * Keyid of the Packet Key
+	 */
+	private byte[] keyid;
+
+	/**
+	 * Constructor that creates the routing as either FWD/HOST or SWAP-FWD/HOST
+	 *
+	 * @param hostname host name 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/HOST routing type, FWD/HOST otherwhise
+	 */
+	private RoutingHOST(String hostname, int port, byte[] keyid, boolean asSwap) {
+		super (asSwap ? RoutingType.SWAP_FWD_HOST : RoutingType.FWD_HOST);
+
+		if (keyid.length != CryptoPrimitives.HASH_LEN)
+			throw new Error("keyid must be HASH_LEN bytes long.");
+
+		this.hostname = hostname;
+		this.port = port;
+		this.keyid = keyid;
+	}
+
+	/**
+	 * Create a FWD/HOST routing.
+	 *
+	 * @param hostname host name of the next hop
+	 * @param port TCP port at which the next hop is listening
+	 * @param keyid keyid of the packet key
+	 */
+	public RoutingHOST(String hostname, int port, byte[] keyid) {
+		this(hostname, port, keyid, false);
+	}
+
+	/**
+	 * Return a routing with the same information but with a SWAP_FWD_HOST routing type.
+	 * 
+	 * @return a SWAP_FWD_HOST routing.
+	 */
+	public RoutingForward asSwap() {
+		RoutingHOST swap = new RoutingHOST(hostname, 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 2 + keyid.length + hostname.length();
+	}
+
+	/**
+	 * Get the routing type of this instance.
+	 *
+	 * @return routing type
+	 */
+	public byte[] getRoutingInformation() {
+		int length = getRoutingInformationLength();
+		byte[] result = new byte[length];
+		int pos = 0;
+
+		result[pos] = (byte) ( (port >> 8) & 0xff);
+		pos++;
+		result[pos] = (byte) (  port       & 0xff);
+		pos++;
+		System.arraycopy(keyid, 0, result, pos, keyid.length);
+		pos += keyid.length;
+		System.arraycopy(Util.toOctets(hostname), 0, result, pos, hostname.length());
+		pos += hostname.length();
+
+		if (pos != length)
+			throw new Error("Did not fill in expected amount of bytes!");
+
+		return result;
+	}
+}
+