From f0d1a5df7aecf1237609200d3ecb7cdd3d0abcab Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sun, 3 Jun 2018 11:46:55 +1200
Subject: Properly handle datagram channels

---
 src/org/traccar/BasePipelineFactory.java | 51 +++++++++++++++++++++++++++-----
 1 file changed, 43 insertions(+), 8 deletions(-)

(limited to 'src/org/traccar/BasePipelineFactory.java')

diff --git a/src/org/traccar/BasePipelineFactory.java b/src/org/traccar/BasePipelineFactory.java
index 0b076a834..2cf4333f5 100644
--- a/src/org/traccar/BasePipelineFactory.java
+++ b/src/org/traccar/BasePipelineFactory.java
@@ -24,6 +24,8 @@ import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.ChannelPipeline;
 import io.netty.channel.ChannelPromise;
+import io.netty.channel.socket.DatagramChannel;
+import io.netty.channel.socket.DatagramPacket;
 import io.netty.handler.timeout.IdleStateHandler;
 import org.traccar.events.CommandResultEventHandler;
 import org.traccar.events.DriverEventHandler;
@@ -80,6 +82,39 @@ public abstract class BasePipelineFactory extends ChannelInitializer<Channel> {
             server.getChannelGroup().add(ctx.channel());
         }
 
+        @Override
+        public void channelInactive(ChannelHandlerContext ctx) throws Exception {
+            super.channelInactive(ctx);
+            server.getChannelGroup().remove(ctx.channel());
+        }
+
+    }
+
+    private static class NetworkMessageHandler extends ChannelDuplexHandler {
+
+        @Override
+        public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+            if (ctx.channel() instanceof DatagramChannel) {
+                DatagramPacket packet = (DatagramPacket) msg;
+                ctx.fireChannelRead(new NetworkMessage(packet.content(), packet.sender()));
+            } else {
+                ByteBuf buffer = (ByteBuf) msg;
+                ctx.fireChannelRead(new NetworkMessage(buffer, ctx.channel().remoteAddress()));
+            }
+        }
+
+        @Override
+        public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
+            NetworkMessage message = (NetworkMessage) msg;
+            if (ctx.channel() instanceof DatagramChannel) {
+                InetSocketAddress recipient = (InetSocketAddress) message.getRemoteAddress();
+                InetSocketAddress sender = (InetSocketAddress) ctx.channel().localAddress();
+                ctx.write(new DatagramPacket((ByteBuf) message.getMessage(), recipient, sender), promise);
+            } else {
+                ctx.write(message.getMessage(), promise);
+            }
+        }
+
     }
 
     private static class StandardLoggingHandler extends ChannelDuplexHandler {
@@ -97,6 +132,7 @@ public abstract class BasePipelineFactory extends ChannelInitializer<Channel> {
         }
 
         public void log(ChannelHandlerContext ctx, boolean downstream, Object o) {
+            NetworkMessage networkMessage = (NetworkMessage) o;
             StringBuilder message = new StringBuilder();
 
             message.append("[").append(ctx.channel().id().asShortText()).append(": ");
@@ -107,17 +143,15 @@ public abstract class BasePipelineFactory extends ChannelInitializer<Channel> {
                 message.append(" < ");
             }
 
-            if (ctx.channel().remoteAddress() != null) {
-                message.append(((InetSocketAddress) ctx.channel().remoteAddress()).getHostString());
+            if (networkMessage.getRemoteAddress() != null) {
+                message.append(((InetSocketAddress) networkMessage.getRemoteAddress()).getHostString());
             } else {
                 message.append("null");
             }
             message.append("]");
 
-            if (o instanceof ByteBuf) {
-                message.append(" HEX: ");
-                message.append(ByteBufUtil.hexDump((ByteBuf) o));
-            }
+            message.append(" HEX: ");
+            message.append(ByteBufUtil.hexDump((ByteBuf) networkMessage.getMessage()));
 
             Log.debug(message.toString());
         }
@@ -192,7 +226,7 @@ public abstract class BasePipelineFactory extends ChannelInitializer<Channel> {
         }
     }
 
-    protected abstract void addSpecificHandlers(ChannelPipeline pipeline);
+    protected abstract void addProtocolHandlers(ChannelPipeline pipeline);
 
     @Override
     protected void initChannel(Channel channel) throws Exception {
@@ -201,11 +235,12 @@ public abstract class BasePipelineFactory extends ChannelInitializer<Channel> {
             pipeline.addLast("idleHandler", new IdleStateHandler(timeout, 0, 0));
         }
         pipeline.addLast("openHandler", new OpenChannelHandler(server));
+        pipeline.addLast("messageHandler", new NetworkMessageHandler());
         if (Context.isLoggerEnabled()) {
             pipeline.addLast("logger", new StandardLoggingHandler());
         }
 
-        addSpecificHandlers(pipeline);
+        addProtocolHandlers(pipeline);
 
         if (geolocationHandler != null) {
             pipeline.addLast("location", geolocationHandler);
-- 
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