init commit

.idea/.gitignore

+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/compiler.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="Internetworking_Protocol" />
+      </profile>
+    </annotationProcessing>
+  </component>
+</project>
\ No newline at end of file

.idea/encodings.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/Internetworking_Protocol/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/Internetworking_Protocol/src/main/resources" charset="UTF-8" />
+  </component>
+</project>
\ No newline at end of file

.idea/internetworking_ws23.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file

.idea/jarRepositories.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://repo.maven.apache.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+  </component>
+</project>
\ No newline at end of file

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/Internetworking_Protocol/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_20" default="true" project-jdk-name="openjdk-20" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file

.idea/modules.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/internetworking_ws23.iml" filepath="$PROJECT_DIR$/.idea/internetworking_ws23.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file

.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file

Internetworking_Protocol/.gitignore

+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file

Internetworking_Protocol/.idea/.gitignore

+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

Internetworking_Protocol/.idea/encodings.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>
\ No newline at end of file

Internetworking_Protocol/.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_20" default="true" project-jdk-name="18" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file

Internetworking_Protocol/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.childmolester</groupId>
+    <artifactId>Internetworking_Protocol</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>20</maven.compiler.source>
+        <maven.compiler.target>20</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-junit-jupiter</artifactId>
+            <version>4.6.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-inline</artifactId>
+            <version>4.6.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>5.9.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <version>5.9.0</version>
+        </dependency>
+    </dependencies>
+</project>
\ No newline at end of file

Internetworking_Protocol/src/main/java/apps/CPClient.java

+package apps;
+
+import cp.*;
+import exceptions.*;
+import phy.*;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.InetAddress;
+
+public class CPClient {
+    private static final String SERVER_NAME = "localhost";
+
+
+    public static void main(String[] args) {
+        // Each client needs to start on a unique UDP port provided by the user
+        if (args.length != 1) {
+            System.out.println("Provide an address identifier (int) from range [5000:65534]");
+            return;
+        }
+        var id = Integer.parseInt(args[0]);
+        if (id < 5000 || id > 65534) {
+            System.out.println("Invalid address identifier! Range [5000:65534]");
+            return;
+        }
+
+        // Set up the virtual link protocol
+        PhyProtocol phy = new PhyProtocol(id);
+
+        // Set up command protocol
+        CPProtocol cp = null;
+        try {
+            cp = new CPProtocol(InetAddress.getByName(SERVER_NAME), CPServer.SERVER_PORT, phy);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        // Read data from user to send to server
+        BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));
+        boolean eof = false;
+        while (!eof) {
+            try {
+                String sentence = null;
+                System.out.println("Command: ");
+                sentence = inFromUser.readLine();
+                // Currently only these two commands are supported by the specification
+                if(!(sentence.equals("status") || sentence.startsWith("print")))
+                    continue;
+
+                cp.send(sentence.trim(), null);
+                System.out.println("Command sent to server ... wating for response");
+                String answer = cp.receive().getData();
+                System.out.println(answer);
+            } catch (IllegalCommandException e) {
+                System.out.println("Only these two commands are supported: status, print \"text\"");
+            } catch (IWProtocolException | IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+}

Internetworking_Protocol/src/main/java/apps/CPServer.java

+package apps;
+
+import core.Msg;
+import cp.CPProtocol;
+import exceptions.IWProtocolException;
+import phy.PhyProtocol;
+
+import java.io.IOException;
+
+public class CPServer {
+    protected static final int SERVER_PORT = 3027;
+
+    public static void main(String[] args) {
+        // Set up the virtual link protocol
+        PhyProtocol phy = new PhyProtocol(SERVER_PORT);
+
+        // Set up command protocol
+        CPProtocol cp = null;
+        try {
+            cp = new CPProtocol(phy);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        // Start server processing
+        boolean eof = false;
+        while (!eof) {
+            try {
+                Msg msg = cp.receive();
+                String sentence = msg.getData().trim();
+                System.out.println("Received message: " + sentence);
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+}
\ No newline at end of file

Internetworking_Protocol/src/main/java/core/Configuration.java

+package core;
+
+/*
+ * Abstract configuration class
+ * nextLowerProtocol attribute is currently unused (ignore)
+ */
+public class Configuration {
+	protected Protocol nextLowerProtocol;
+	
+	public Configuration(Protocol proto) {
+		this.nextLowerProtocol = proto;
+	}
+
+	public Protocol getNextLowerProtocol() {
+		return nextLowerProtocol;
+	}
+
+	private void setNextLowerProtocol(Protocol nextLowerProtocol) {
+		this.nextLowerProtocol = nextLowerProtocol;
+	}
+}

Internetworking_Protocol/src/main/java/core/Msg.java

+package core;
+
+import exceptions.IWProtocolException;
+
+/* 
+ * Msg base class (abstract)
+ */
+public abstract class Msg {
+	protected String data;
+	protected byte[] dataBytes;
+	protected Configuration config;
+	
+	public byte[] getDataBytes() {
+		return this.dataBytes;
+	}
+	
+	public int getLength() {
+		return this.dataBytes.length;
+	}
+	
+	public String getData() {
+		return this.data;
+	}
+	
+	public void setData(String data) {
+		this.data = data;
+	}
+	
+	public Configuration getConfiguration() {
+		return this.config;
+	}
+	public void setConfiguration(Configuration c) {this.config = c;}
+	
+	protected abstract void create(String sentence);
+	protected abstract Msg parse(String sentence) throws IWProtocolException;
+	
+	
+	public void printDataBytes() {
+		String msgString = new String(this.dataBytes);
+		System.out.println(msgString);
+	}
+}

Internetworking_Protocol/src/main/java/core/Protocol.java

+package core;
+
+import java.io.IOException;
+
+import exceptions.IWProtocolException;
+
+/*
+ * Protocol base class (abstract)
+ */
+public abstract class Protocol {
+	public enum proto_id {
+		PHY, APP, SLP, CP
+	}
+
+	public abstract void send(String s, Configuration config) throws IOException, IWProtocolException;
+	public abstract Msg receive() throws IOException, IWProtocolException;
+
+}

Internetworking_Protocol/src/main/java/cp/CPCookieRequestMsg.java

+package cp;
+
+import core.Msg;
+import exceptions.IllegalMsgException;
+
+class CPCookieRequestMsg extends CPMsg {
+    protected static final String CP_CREQ_HEADER = "creq";
+
+    /*
+     * Create cookie request message.
+     * The cp header is prepended in the super-class.
+     */
+    @Override
+    protected void create(String data) {
+        // prepend reg header
+        data = CP_CREQ_HEADER;
+        // super class prepends slp header
+        super.create(data);
+    }
+
+    @Override
+    protected Msg parse(String sentence) throws IllegalMsgException {
+        if (!sentence.startsWith(CP_CREQ_HEADER)) {
+            throw new IllegalMsgException();
+        }
+        return this;
+    }
+}
\ No newline at end of file

Internetworking_Protocol/src/main/java/cp/CPCookieResponseMsg.java

+package cp;
+
+import core.Msg;
+import exceptions.IllegalMsgException;
+
+class CPCookieResponseMsg extends CPMsg {
+    protected static final String CP_CRES_HEADER = "cres";
+    private boolean success;
+
+    protected CPCookieResponseMsg() {
+
+    }
+    protected CPCookieResponseMsg(boolean s) {
+        this.success = s;
+    }
+
+    protected boolean getSuccess() {return this.success;}
+
+    /*
+     * Create cookie request message.
+     * The cp header is prepended in the super-class.
+     */
+    @Override
+    protected void create(String data) {
+        if (this.success) {
+            // prepend cres header
+            data = CP_CRES_HEADER + " ACK " + data;
+        } else {
+            data = CP_CRES_HEADER + " NAK " + data;
+        }
+        // super class prepends slp header
+        super.create(data);
+    }
+
+    protected Msg parse(String sentence) throws IllegalMsgException {
+        if (!sentence.startsWith(CP_CRES_HEADER)) {
+            throw new IllegalMsgException();
+        }
+        String[] parts = sentence.split("\\s+", 3);
+
+        if(parts[1].equals("ACK"))
+            this.success = true;
+        else
+            this.success = false;
+
+        this.data = parts[2];
+        return this;
+    }
+
+}