V1.0.4 Handle backspace

conf/log4j2.xml

@@ -16,7 +16,7 @@
 		</RollingFile>
 	</Appenders>
 	<Loggers>
-		<Root level="info">
+		<Root level="debug">
 			<AppenderRef ref="LogToConsole" />
 		</Root>
 	</Loggers>

conf/replies.properties

@@ -1,7 +1,7 @@
-prompt=$ 
+prompt=root@localhost$ 
 5BAABD7C4581F90088133C0E945302C2=\t0\t0\t0 -
 uname=Linux
-9DD46246144D353C914D7572AEDF8EA6=Linux mail.vidconnect.cyou 4.15.0-70-generic #79-Ubuntu SMP Tue Nov 12 10:36:10 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux
+9DD46246144D353C914D7572AEDF8EA6=Linux localhost 4.15.0-70-generic #79-Ubuntu SMP Tue Nov 12 10:36:10 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux
-whoami=appadmin
+whoami=root
 4DE8A3B5E72E54D9D2A70BD43CB5EA9E=Model:\t\t0
 99EFF9F4022855955653078ECB2B4CE4=1.9G

pom.xml

@@ -4,7 +4,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>com.example.sshd</groupId>
 	<artifactId>echo-sshd-server</artifactId>
-	<version>1.0.3</version>
+	<version>1.0.4</version>
 	<name>ECHO SSH SERVER</name>
 	<description>Learning Apache Mina SSHD library</description>
 	<parent>

src/main/java/com/example/sshd/config/EchoShellFactory.java

@@ -100,7 +100,7 @@ public class EchoShellFactory implements Factory<Command> {
 
 		@Override
 		public void run() {
-			String prompt = repliesProperties.getProperty("prompt","$ ");
+			String prompt = repliesProperties.getProperty("prompt", "$ ");
 			try {
 				out.write(prompt.getBytes());
 				out.flush();
@@ -116,8 +116,16 @@ public class EchoShellFactory implements Factory<Command> {
 						}
 						command = "";
 					} else {
-						out.write(s);
+						logger.trace("input character: {}", s);
-						command += (char) s;
+						if (s == 127) {
+							if (command.length() > 0) {
+								command = command.substring(0, command.length() - 1);
+								out.write(s);
+							}
+						} else if (s >= 32 && s < 127) {
+							command += (char) s;
+							out.write(s);
+						}
 					}
 					out.flush();
 				}