Access to banner (#206)

* Update TimeoutService.java

interrupt hanging timeoutservice threads

* Update TimeoutService.java

* Update TimeoutService.java

* Update Connection.java

* Update Connection.java

* Update TimeoutService.java

* Update TimeoutService.java

* Update Connection.java

* JENKINS-74733: Not possible to access banner content

* JENKINS-74733: Not possible to access banner content

---------

Co-authored-by: mpet <mikael.petterson@ericsson.com>

.gitignore

@@ -22,4 +22,7 @@ nbbuild/
 dist/
 nbdist/
 nbactions.xml
-nb-configuration.xml
+nb-configuration.xml
+
+#vscode
+.vscode/

src/com/trilead/ssh2/Connection.java

@@ -23,6 +23,8 @@
 import java.net.InetSocketAddress;
 import java.net.SocketTimeoutException;
 import java.security.SecureRandom;
+import java.util.Collections;
+import java.util.List;
 import java.util.Vector;
 
 /**
@@ -515,6 +517,17 @@ public synchronized boolean authenticateWithPublicKey(String user, File pemFile,
 
 		return authenticateWithPublicKey(user, cw.toCharArray(), password);
 	}
+	/**
+	 * Method will return the banners provided by the server.
+	 * {@link AuthenticationManager#getBanners()}
+	 * @return a list of banner strings or empty if no banners is sent.
+	 */
+	public List<String> getBanners(){
+		if(am != null ){
+			return am.getBanners();
+		}
+		return Collections.emptyList();
+	}
 
 	/**
 	 * Add a {@link ConnectionMonitor} to this connection. Can be invoked at any

src/com/trilead/ssh2/auth/AuthenticationManager.java

@@ -14,6 +14,7 @@
 import java.security.PrivateKey;
 import java.security.PublicKey;
 import java.security.SecureRandom;
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.Vector;
@@ -34,7 +35,7 @@ public class AuthenticationManager implements MessageHandler
 	Vector packets = new Vector();
 	boolean connectionClosed = false;
 
-	String banner;
+	List<String> banners = new ArrayList<>();
 
 	String[] remainingMethods = new String[0];
 	boolean isPartialSuccess = false;
@@ -104,9 +105,21 @@ byte[] getNextMessage() throws IOException
 
 			PacketUserauthBanner sb = new PacketUserauthBanner(msg, 0, msg.length);
 
-			banner = sb.getBanner();
+			banners.add(sb.getBanner()); 
 		}
 	}
+	/**
+	 * This method contains the SSH_MSG_USERAUTH_BANNER messages 
+	 * sent by the server. Messages can be sent at any time before
+	 * SSH protocol starts and the authentication is complete.
+	 * The purpose of the message is to display info to the user
+	 * before authentication starts. 
+	 * Note: If there are messages sent make sure authentication
+	 * is complete before using this method.
+	 */
+	public List<String> getBanners(){
+		return banners;
+	}
 
 	public String[] getRemainingMethods(String user) throws IOException
 	{