From d9e2136bc52c2b7661698614016d864cfa8b350b Mon Sep 17 00:00:00 2001
From: Niki <david.roulet@uclouvain.be>
Date: Wed, 17 Apr 2019 14:26:51 +0200
Subject: [PATCH] server: add trace to display SSL ciphers

---
 .../utils/serial/server/ConnectAction.java    | 35 ++++++++++++++-----
 .../nikiroo/utils/serial/server/Server.java   | 11 +++++-
 2 files changed, 36 insertions(+), 10 deletions(-)

diff --git a/src/be/nikiroo/utils/serial/server/ConnectAction.java b/src/be/nikiroo/utils/serial/server/ConnectAction.java
index 10435e2..39417a7 100644
--- a/src/be/nikiroo/utils/serial/server/ConnectAction.java
+++ b/src/be/nikiroo/utils/serial/server/ConnectAction.java
@@ -6,6 +6,8 @@ import java.io.InputStreamReader;
 import java.io.OutputStreamWriter;
 import java.net.Socket;
 
+import javax.net.ssl.SSLException;
+
 import be.nikiroo.utils.Version;
 import be.nikiroo.utils.serial.Exporter;
 import be.nikiroo.utils.serial.Importer;
@@ -102,8 +104,8 @@ abstract class ConnectAction {
 	 */
 	public void connect() {
 		try {
-			in = new BufferedReader(new InputStreamReader(s.getInputStream(),
-					"UTF-8"));
+			in = new BufferedReader(
+					new InputStreamReader(s.getInputStream(), "UTF-8"));
 			try {
 				out = new OutputStreamWriter(s.getOutputStream(), "UTF-8");
 				try {
@@ -140,6 +142,20 @@ abstract class ConnectAction {
 				in = null;
 			}
 		} catch (Exception e) {
+			if (e instanceof SSLException) {
+				String ciphers = "";
+				for (String cipher : Server.getAnonCiphers()) {
+					if (!ciphers.isEmpty()) {
+						ciphers += ", ";
+					}
+					ciphers += cipher;
+				}
+
+				e = new SSLException(
+						"SSL error (available SSL ciphers: " + ciphers + ")",
+						e);
+			}
+			
 			onError(e);
 		} finally {
 			try {
@@ -172,11 +188,12 @@ abstract class ConnectAction {
 	 * @throws ClassNotFoundException
 	 *             if a class described in the serialised data cannot be found
 	 */
-	protected Object sendObject(Object data) throws IOException,
-			NoSuchFieldException, NoSuchMethodException, ClassNotFoundException {
+	protected Object sendObject(Object data)
+			throws IOException, NoSuchFieldException, NoSuchMethodException,
+			ClassNotFoundException {
 		synchronized (lock) {
-			String rep = sendString(new Exporter().append(data).toString(true,
-					true));
+			String rep = sendString(
+					new Exporter().append(data).toString(true, true));
 			if (rep != null) {
 				return new Importer().read(rep).getValue();
 			}
@@ -209,9 +226,9 @@ abstract class ConnectAction {
 	 * @throws java.lang.NullPointerException
 	 *             if the counter part has no data to send
 	 */
-	protected Object recObject() throws IOException, NoSuchFieldException,
-			NoSuchMethodException, ClassNotFoundException,
-			java.lang.NullPointerException {
+	protected Object recObject()
+			throws IOException, NoSuchFieldException, NoSuchMethodException,
+			ClassNotFoundException, java.lang.NullPointerException {
 		String str = recString();
 		if (str == null) {
 			throw new NullPointerException("No more data available");
diff --git a/src/be/nikiroo/utils/serial/server/Server.java b/src/be/nikiroo/utils/serial/server/Server.java
index afceaf9..f6dd7d8 100644
--- a/src/be/nikiroo/utils/serial/server/Server.java
+++ b/src/be/nikiroo/utils/serial/server/Server.java
@@ -194,6 +194,15 @@ abstract class Server implements Runnable {
 			tracer.trace(name + ": server starting on port " + port + " ("
 					+ (ssl ? "SSL" : "plain text") + ")");
 
+			String ciphers = "";
+			for (String cipher : getAnonCiphers()) {
+				if (!ciphers.isEmpty()) {
+					ciphers += ", ";
+				}
+				ciphers += cipher;
+			}
+			tracer.trace("Available SSL ciphers: " + ciphers);
+
 			while (started && !exiting) {
 				count(1);
 				final Socket s = ss.accept();
@@ -407,7 +416,7 @@ abstract class Server implements Runnable {
 	 * 
 	 * @return the list of such supported ciphers
 	 */
-	private static String[] getAnonCiphers() {
+	public static String[] getAnonCiphers() {
 		List<String> anonCiphers = new ArrayList<String>();
 		for (String cipher : ((SSLSocketFactory) SSLSocketFactory.getDefault())
 				.getSupportedCipherSuites()) {
-- 
2.27.0