I2CP Multisession support and multiple destinations in one tunnel pool.

Work in progress.
Router-side I2CP mostly done.
Client-side I2CP mostly done but undecided on how to handle
listeners.
Streaming stubbed out but may be wrong, may need multiple socket managers,
not clear how to proceed.
I2PTunnel not started.
Blacklist of DSA-only dests not started.
Router leaseset publishing not correct. Not clear whether to have
additional tunnel pools with flags, or put the tunnel pools into
the client hashmap twice. Client config contains destination,
may need to move that to tunnel pool.

apps/streaming/java/src/net/i2p/client/streaming/impl/I2PSocketManagerFull.java

@@ -1,14 +1,17 @@
 package net.i2p.client.streaming.impl;
 
 import java.io.IOException;
+import java.io.InputStream;
 import java.net.ConnectException;
 import java.net.NoRouteToHostException;
 import java.net.ServerSocket;
 import java.net.Socket;
 import java.net.SocketTimeoutException;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Properties;
 import java.util.Set;
+import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicInteger;
 
@@ -37,6 +40,7 @@ public class I2PSocketManagerFull implements I2PSocketManager {
     private final I2PAppContext _context;
     private final Log _log;
     private final I2PSession _session;
+    private final List<I2PSession> _subsessions;
     private final I2PServerSocketFull _serverSocket;
     private StandardServerSocket _realServerSocket;
     private final ConnectionOptions _defaultOptions;
@@ -80,6 +84,7 @@ public class I2PSocketManagerFull implements I2PSocketManager {
     public I2PSocketManagerFull(I2PAppContext context, I2PSession session, Properties opts, String name) {
         _context = context;
         _session = session;
+        _subsessions = new CopyOnWriteArrayList<I2PSession>();
         _log = _context.logManager().getLog(I2PSocketManagerFull.class);
         
         _name = name + " " + (__managerId.incrementAndGet());
@@ -117,6 +122,39 @@ public class I2PSocketManagerFull implements I2PSocketManager {
         return _session;
     }
     
+//////////// gahhh we want a socket manager, not a session
+    /**
+     *  @return a new subsession, non-null
+     *  @param privateKeyStream null for transient, if non-null must have same encryption keys as primary session
+     *                          and different signing keys
+     *  @param opts subsession options if any, may be null
+     *  @since 0.9.19
+     */
+    public I2PSession addSubsession(InputStream privateKeyStream, Properties opts) throws I2PSessionException {
+        I2PSession rv = _session.addSubsession(privateKeyStream, opts);
+        _subsessions.add(rv);
+        return rv;
+    }
+    
+    /**
+     *  Remove the subsession
+     *
+     *  @since 0.9.19
+     */
+    public void removeSubsession(I2PSession session) {
+        _session.removeSubsession(session);
+        _subsessions.remove(session);
+        // ...
+    }
+    
+    /**
+     *  @return a list of subsessions, non-null, does not include the primary session
+     *  @since 0.9.19
+     */
+    public List<I2PSession> getSubsessions() {
+        return _session.getSubsessions();
+    }
+    
     public ConnectionManager getConnectionManager() {
         return _connectionManager;
     }