Router: revert changes to IMD garlic handling

router/java/src/net/i2p/router/tunnel/InboundMessageDistributor.java

@@ -198,12 +198,9 @@ public void distribute(I2NPMessage msg, Hash target, TunnelId tunnel) {
             } // switch
         } // client != null
 
-        if ( (target == null) && (tunnel == null) ) {
-            // Since the InboundMessageDistributor handles messages for the endpoint,
-            // most messages that arrive here have both target==null and tunnel==null.
-            // Messages with targeting instructions need careful handling, and will
-            // typically be dropped because we're the endpoint.  Especially when they
-            // specifically target this router (_context.routerHash().equals(target)).
+        if ( (target == null) || ( (tunnel == null) && (_context.routerHash().equals(target) ) ) ) {
+            // targetting us either implicitly (no target) or explicitly (no tunnel)
+            // make sure we don't honor any remote requests directly (garlic instructions, etc)
             if (type == GarlicMessage.MESSAGE_TYPE) {
                 // in case we're looking for replies to a garlic message (cough load tests cough)
                 _context.inNetMessagePool().handleReplies(msg);
@@ -212,40 +209,47 @@ public void distribute(I2NPMessage msg, Hash target, TunnelId tunnel) {
                 _receiver.receive((GarlicMessage)msg);
             } else {
                 if (_log.shouldLog(Log.INFO))
-                    _log.info("distributing inbound tunnel message into our inNetMessagePool"
-                              + " (for client " + _clientNickname + " ("
-                              + ((_client != null) ? _client.toBase32() : "null")
-                              + ") to target=NULL/tunnel=NULL " + msg);
-                _context.inNetMessagePool().add(msg, null, null, _msgIDBloomXor);
+                    _log.info("distributing inbound tunnel message into our inNetMessagePool: " + msg);
+                _context.inNetMessagePool().add(msg, null, null);
             }
+/****** latency measuring attack?
         } else if (_context.routerHash().equals(target)) {
-            if (type == GarlicMessage.MESSAGE_TYPE)
-                if (_log.shouldLog(Log.WARN))
-                    _log.warn("Dropping inbound garlic message TARGETED TO OUR ROUTER for client "
-                              + _clientNickname + " ("
-                              + ((_client != null) ? _client.toBase32() : "null")
-                              + ") to " + target + " / " + tunnel);
-            else
-                if (_log.shouldLog(Log.WARN))
-                    _log.warn("Dropping inbound message TARGETED TO OUR ROUTER for client "
-                              + _clientNickname + " (" + ((_client != null) ? _client.toBase32() : "null")
-                              + ") to " + target + " / " + tunnel + " : " + msg);
-            return;
+            // the want to send it to a tunnel, except we are also that tunnel's gateway
+            // dispatch it directly
+            if (_log.shouldLog(Log.INFO))
+                _log.info("distributing inbound tunnel message back out, except we are the gateway");
+            TunnelGatewayMessage gw = new TunnelGatewayMessage(_context);
+            gw.setMessage(msg);
+            gw.setTunnelId(tunnel);
+            gw.setMessageExpiration(_context.clock().now()+10*1000);
+            gw.setUniqueId(_context.random().nextLong(I2NPMessage.MAX_ID_VALUE));
+            _context.tunnelDispatcher().dispatch(gw);
+******/
         } else {
-            if (type == GarlicMessage.MESSAGE_TYPE)
+            // ok, they want us to send it remotely, but that'd bust our anonymity,
+            // so we send it out a tunnel first
+            // TODO use the OCMOSJ cache to pick OB tunnel we are already using?
+            TunnelInfo out = _context.tunnelManager().selectOutboundTunnel(_client, target);
+            if (out == null) {
                 if (_log.shouldLog(Log.WARN))
-                    _log.warn("Dropping targeted inbound garlic message for client "
-                              + _clientNickname + " ("
-                              + ((_client != null) ? _client.toBase32() : "null")
-                              + ") to " + target + " / " + tunnel);
-            else
-                if (_log.shouldLog(Log.WARN))
-                    _log.warn("Dropping targeted inbound message for client " + _clientNickname
-                              + " (" + ((_client != null) ? _client.toBase32() : "null")
-                              + " to " + target + " / " + tunnel + " : " + msg);
-            return;
+                    _log.warn("no outbound tunnel to send the client message for " + _client + ": " + msg);
+                return;
+            }
+            if (_log.shouldLog(Log.DEBUG))
+                _log.debug("distributing IB tunnel msg type " + type + " back out " + out
+                          + " targetting " + target);
+            TunnelId outId = out.getSendTunnelId(0);
+            if (outId == null) {
+                if (_log.shouldLog(Log.ERROR))
+                    _log.error("strange? outbound tunnel has no outboundId? " + out 
+                               + " failing to distribute " + msg);
+                return;
+            }
+            long exp = _context.clock().now() + 20*1000;
+            if (msg.getMessageExpiration() < exp)
+                msg.setMessageExpiration(exp);
+            _context.tunnelDispatcher().dispatchOutbound(msg, outId, tunnel, target);
         }
-
     }
 
     /**