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Minecon724 2024-07-19 15:07:18 +02:00
commit ce1bbc047a
Signed by: Minecon724
GPG key ID: 3CCC4D267742C8E8
7 changed files with 260 additions and 0 deletions
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40
.classpath Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" output="target/classes" path="src/main/java">
<attributes>
<attribute name="optional" value="true"/>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
<attributes>
<attribute name="maven.pomderived" value="true"/>
<attribute name="optional" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="src" output="target/test-classes" path="src/test/java">
<attributes>
<attribute name="test" value="true"/>
<attribute name="optional" value="true"/>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
<attributes>
<attribute name="test" value="true"/>
<attribute name="maven.pomderived" value="true"/>
<attribute name="optional" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-17">
<attributes>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
<attributes>
<attribute name="maven.pomderived" value="true"/>
</attributes>
</classpathentry>
<classpathentry kind="output" path="target/classes"/>
</classpath>

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.gitignore vendored Normal file
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/target/
/.settings/

23
.project Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>netsim</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.m2e.core.maven2Builder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
<nature>org.eclipse.m2e.core.maven2Nature</nature>
</natures>
</projectDescription>

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pom.xml Normal file
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<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>eu.m724</groupId>
<artifactId>netsim</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<maven.compiler.target>17</maven.compiler.target>
<maven.compiler.source>17</maven.compiler.source>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>

134
src/main/java/eu/m724/netsim/Machine.java Normal file
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package eu.m724.netsim;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class Machine {
public final String id;
private List<Machine> peers = new ArrayList<>();
// key - destination
private HashMap<Machine, RoutingInfo> routingTable = new HashMap<>();
public Machine(String id) {
this.id = id;
}
/**
* get route to machine
* @param machine the machine to get route to
* @return the route to machine
*/
public RoutingInfo getRouteTo(Machine machine) {
return routingTable.get(machine);
}
/**
* import a route
* @param from the machine the route is imported from
* @param route
* @return if I accepted the route
*/
public boolean importRoute(Machine from, RoutingInfo route) {
Machine dest = route.dest();
int pathLength = route.pathLength();
// if this route leads to this machine
// or via this machine or the route is from an unknown machine
if (dest.equals(this) || route.from().equals(this) || !route.from().equals(from)) {
System.out.printf("%s rejected from %s route %s\n", id, from.id, route.toString());
return false;
}
RoutingInfo existingInfo = routingTable.get(dest);
// reject if destination already exists and is faster
if (existingInfo != null && existingInfo.pathLength() < pathLength) {
return false;
}
// TODO other import filtering here
routingTable.put(route.dest(), route);
if (from.equals(dest) && pathLength == 1)
System.out.printf("%s accepted direct from %s\n", id, from.id);
else
System.out.printf("%s accepted from %s route %s\n", id, from.id, route.toString());
for (Machine peer : peers) {
if (peer.equals(from) || peer.equals(dest)) continue;
exportRoute(peer, route);
}
return true;
}
/**
* export a route
* @param to the machine to export a route to
* @param route
* @return if the machine accepted the route
*/
public boolean exportRoute(Machine to, RoutingInfo route) {
if (route == null) return false;
if (to.equals(route.dest())) return false;
if (to.equals(route.from())) return false;
// TODO export filtering here
System.out.printf("%s exports to %s route %s\n", id, to.id, route.toString());
return to.importRoute(this, route.nextHop(this));
}
/**
*
* @param to the machine to export a route to
* @param dest the destination of exported route
* @return if the machine accepted the route
*/
public boolean exportRouteTo(Machine to, Machine dest) {
return exportRoute(to, routingTable.get(dest));
}
/**
* peer with somebody
* all tables are exported
* @param machine the machine to peer with
* @return peering successful (if not already peering)
*/
public boolean peer(Machine machine) {
System.out.printf("%s peering with %s\n", id, machine.id);
boolean success = peers.add(machine);
importRoute(machine, RoutingInfo.direct(machine));
for (RoutingInfo route : routingTable.values()) {
exportRoute(machine, route);
}
return success;
}
/**
* peer with somebody and make that somebody peer with me
* all tables are exported
* @param machine the machine to peer with
* @return peering successful (if not already peering)
*/
public boolean peerWith(Machine machine) {
if (peer(machine)) return machine.peer(this);
return false;
}
@Override
public boolean equals(Object object) {
if (object == this) return true;
if (object == null) return false;
if (!(object instanceof Machine)) return false;
Machine machine = (Machine) object;
if (!machine.id.equals(this.id)) return false;
return true;
}
}

15
src/main/java/eu/m724/netsim/RoutingInfo.java Normal file
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package eu.m724.netsim;
public record RoutingInfo(Machine dest, Machine from, int pathLength) {
public String toString() {
return "%s via %s len %d".formatted(dest.id, from.id, pathLength);
}
public RoutingInfo nextHop(Machine from) {
return new RoutingInfo(dest, from, pathLength + 1);
}
public static RoutingInfo direct(Machine machine) {
return new RoutingInfo(machine, machine, 1);
}
}

25
src/test/java/netsim/PeeringTest.java Normal file
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package netsim;
import org.junit.Test;
import eu.m724.netsim.Machine;
public class PeeringTest {
@Test
public void testPeering() {
// machine1 - machine2 - machine3
// so machine1 goes to machine3 through machine2
Machine machine1 = new Machine("machine1");
Machine machine2 = new Machine("machine2");
Machine machine3 = new Machine("machine3");
machine1.peerWith(machine2);
machine2.peerWith(machine3);
System.out.println("");
System.out.println(machine1.getRouteTo(machine2).toString());
System.out.println(machine2.getRouteTo(machine3).toString());
System.out.println(machine1.getRouteTo(machine3).toString());
}
}