Better messages for Traffic Router exceptions

CHANGELOG.md

@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ## [unreleased]
 ### Added
+- [#7081](https://github.com/apache/trafficcontrol/issues/7081) *Traffic Router* Added better log messages for TR connection exceptions.
 - [#7089](https://github.com/apache/trafficcontrol/issues/7089) *Traffic Router* Added the ability to specify HTTPS certificate attributes.
 - [#7109](https://github.com/apache/trafficcontrol/pull/7109) *Traffic Router* Removed `dnssec.zone.diffing.enabled` and `dnssec.rrsig.cache.enabled` parameters.
 - [#7075](https://github.com/apache/trafficcontrol/pull/7075) *Traffic Portal* Added the `lastUpdated` field to all delivery service forms.

traffic_router/core/src/main/java/org/apache/traffic_control/traffic_router/core/dns/protocol/TCP.java

@@ -17,11 +17,13 @@
 
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
+import java.io.EOFException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.InetAddress;
 import java.net.ServerSocket;
 import java.net.Socket;
+import java.net.SocketTimeoutException;
 import java.nio.channels.Channels;
 
 import org.apache.logging.log4j.LogManager;
@@ -91,6 +93,7 @@ class TCPSocketHandler implements SocketHandler {
         @Override
         @SuppressWarnings("PMD.EmptyCatchBlock")
         public void run() {
+            InetAddress client = null;
             if (cancel) {
                 cleanup();
                 return;
@@ -101,7 +104,7 @@ public void run() {
                  DataOutputStream os = new DataOutputStream(socket.getOutputStream())
             ) {
                 socket.setSoTimeout(getReadTimeout());
-                final InetAddress client = socket.getInetAddress();
+                client = socket.getInetAddress();
 
                 final int length = is.readUnsignedShort();
                 final byte[] request = new byte[length];
@@ -112,6 +115,20 @@ public void run() {
                 os.write(response);
             } catch (final WireParseException e) {
                 // This is already recorded in the access log
+            } catch (final SocketTimeoutException e) {
+                String hostAddress = "unknown";
+                if (client != null) {
+                    hostAddress = client.getHostAddress();
+                }
+                LOGGER.error("The socket with the Client at: " +
+                        hostAddress + " has timed out. Error: " + e.getMessage());
+            } catch (final EOFException e) {
+                String hostAddress = "unavailable";
+                if (client != null) {
+                    hostAddress = client.getHostAddress();
+                }
+                LOGGER.error("The client at " + hostAddress +
+                        " has closed the connection prematurely. Error: " + e.getMessage());
             } catch (final Exception e) {
                 LOGGER.error(e.getMessage(), e);
             } finally {