test(core): RIP measured with Java FILIUS
RipRun runs rip-chain's three routers in Java FILIUS, each router's random set by reflection to the core's ripSeed, and writes the frames, every change of each RIP table and the calls. converge: the tables fill, a ping at 45 s. expire: R3 falls silent at 10 s; R2 marks its network 16 hops only at its own next beacon, R1 passes it on at once, the ping gets ICMP 3/0. Both match: per sending card the same messages at the same times, every table through the same states. The first 5 s are compared by the state the tables reach, since Java's routers start one after the other. Measured on the JDK: Java's pause divides nextFloat() by 3 in float; the core does too now (a millisecond off in one draw of about 10,000 before). Scenarios name their RIP routers in the new field rip. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Claude Opus 5.5
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// Runs rip-chain's network in Java FILIUS (ScenarioNetwork) and records what
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// RIP really does: every frame each card saw, every change of each router's
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// RIP table, and the calls of the story.
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//
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// RipRun <scenario.json> <story> <milliseconds> <out.json>
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//
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// PC 10.0.1.2 - R1 (10.0.1.1, 10.0.12.1) - R2 (10.0.12.2, 10.0.23.2) -
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// R3 (10.0.23.3, 10.0.3.1) - PC 10.0.3.2, each router with RIP. Java draws a
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// router's pauses from a new Random; this tool gives each the seed the core
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// gives it (ripSeed: the scenario's seed, 0x52495000 and the FNV-1a hash of
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// the router's id). The stories:
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// converge the tables fill; at 45 s 10.0.1.2 pings 10.0.3.2
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// expire at 10 s R3 falls silent (its next beacon never comes); its
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// network expires at R2, which tells R1; at 125 s the ping again
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import filius.hardware.knoten.Knoten;
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import filius.software.rip.RIPBeacon;
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import filius.software.rip.RIPRoute;
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import filius.software.rip.RIPTable;
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import filius.software.system.VermittlungsrechnerBetriebssystem;
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import filius.software.vermittlungsschicht.IcmpPaket;
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import java.lang.reflect.Field;
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import java.util.ArrayList;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Random;
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public class RipRun {
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static final String PC_A = "00000000-0000-0000-0000-000000000401";
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static final String R3 = "00000000-0000-0000-0000-000000000404";
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static ScenarioNetwork network;
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static final List<Object[]> events = new ArrayList<>();
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static final List<Object[]> tables = new ArrayList<>();
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static final Map<String, String> lastTables = new LinkedHashMap<>();
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static synchronized void event(String what) {
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events.add(new Object[] { System.currentTimeMillis() - network.start, what });
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}
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/** The table as one line: `network/mask gateway interface hops; …`, in its order. */
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static String tableText(RIPTable table) {
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StringBuilder text = new StringBuilder();
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synchronized (table) {
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for (RIPRoute route : table.routes) {
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if (text.length() > 0) text.append("; ");
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text.append(route.getNetAddress()).append('/').append(route.getNetMask()).append(' ').append(route.getGateway())
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.append(' ').append(route.getInterfaceIpAddress()).append(' ').append(route.hops);
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}
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}
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return text.toString();
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}
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static synchronized void pollTables() {
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for (Map.Entry<String, Knoten> entry : network.nodes.entrySet()) {
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if (!(entry.getValue().getSystemSoftware() instanceof VermittlungsrechnerBetriebssystem)) continue;
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RIPTable table = ((VermittlungsrechnerBetriebssystem) entry.getValue().getSystemSoftware()).getRIPTable();
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if (table == null) continue;
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String text = tableText(table);
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if (!text.equals(lastTables.get(entry.getKey()))) {
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lastTables.put(entry.getKey(), text);
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tables.add(new Object[] { System.currentTimeMillis() - network.start, entry.getKey(), text });
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}
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}
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}
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/** The core's ripSeed. */
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static long ripSeed(long seed, String nodeId) {
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int hash = 0x811c9dc5;
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for (int index = 0; index < nodeId.length(); index++) {
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hash = (hash ^ nodeId.charAt(index)) * 0x01000193;
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}
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return seed ^ 0x52495000L ^ (hash & 0xffffffffL);
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}
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static String icmp(IcmpPaket packet) {
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return packet == null ? "null" : "ICMP " + packet.getIcmpType() + "/" + packet.getIcmpCode() + " from " + packet.getSender();
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}
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static void ping(String target) {
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event("sendProbe " + target + " called");
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IcmpPaket answer = network.system(PC_A).holeICMP().sendProbe(target, 64, 1, 1);
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event("sendProbe " + target + " returned " + icmp(answer));
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}
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static void sleepUntil(long milliseconds) throws InterruptedException {
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long rest = network.start + milliseconds - System.currentTimeMillis();
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if (rest > 0) Thread.sleep(rest);
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}
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public static void main(String[] args) throws Exception {
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network = ScenarioNetwork.read(args[0]);
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String story = args[1];
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long end = Long.parseLong(args[2]);
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long seed = ScenarioNetwork.seed(args[0]);
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network.start();
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Field beaconField = VermittlungsrechnerBetriebssystem.class.getDeclaredField("ripbeacon");
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beaconField.setAccessible(true);
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Field randomField = RIPBeacon.class.getDeclaredField("rand");
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randomField.setAccessible(true);
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for (Map.Entry<String, Knoten> entry : network.nodes.entrySet()) {
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if (!(entry.getValue().getSystemSoftware() instanceof VermittlungsrechnerBetriebssystem)) continue;
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VermittlungsrechnerBetriebssystem os = (VermittlungsrechnerBetriebssystem) entry.getValue().getSystemSoftware();
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if (!os.isRipEnabled()) continue;
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randomField.set(beaconField.get(os), new Random(ripSeed(seed, entry.getKey())));
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}
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event("seeded");
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Thread poller = new Thread(() -> {
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while (true) {
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pollTables();
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try {
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Thread.sleep(2);
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} catch (InterruptedException e) {
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return;
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}
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}
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});
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poller.setDaemon(true);
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poller.start();
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switch (story) {
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case "converge":
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sleepUntil(45_000);
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ping("10.0.3.2");
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break;
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case "expire":
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sleepUntil(10_000);
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((VermittlungsrechnerBetriebssystem) network.system(R3)).getRIPTable().setNextBeacon(Long.MAX_VALUE);
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event("R3 silent");
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sleepUntil(125_000);
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ping("10.0.3.2");
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break;
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default:
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throw new IllegalArgumentException("unknown story " + story);
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}
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sleepUntil(end);
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pollTables();
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ScenarioNetwork.Json out = new ScenarioNetwork.Json();
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out.open('{');
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network.writeFrames(out);
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synchronized (RipRun.class) {
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out.key("events").open('[');
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for (Object[] each : events) out.open('[').number((Long) each[0]).string((String) each[1]).close(']');
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out.close(']');
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out.key("tables").open('[');
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for (Object[] each : tables) out.open('[').number((Long) each[0]).string((String) each[1]).string((String) each[2]).close(']');
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out.close(']');
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}
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out.close('}');
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network.stop();
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ScenarioNetwork.write(args[3], out);
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System.exit(0);
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}
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}
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@@ -22,6 +22,7 @@ import filius.software.dhcp.DHCPServer;
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import filius.software.dns.DNSServer;
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import filius.software.netzzugangsschicht.EthernetFrame;
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import filius.software.system.InternetKnotenBetriebssystem;
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import filius.software.system.VermittlungsrechnerBetriebssystem;
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import filius.software.transportschicht.Segment;
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import filius.software.transportschicht.TcpSegment;
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import filius.software.vermittlungsschicht.ArpPaket;
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@@ -58,6 +59,14 @@ public class ScenarioNetwork {
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return network;
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}
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/** The scenario's seed. */
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@SuppressWarnings("unchecked")
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static long seed(String path) throws Exception {
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Map<String, Object> scenario = (Map<String, Object>) new JsonReader(
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new String(Files.readAllBytes(Paths.get(path)), StandardCharsets.UTF_8)).value();
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return ((Number) scenario.get("seed")).longValue();
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}
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private void build(Map<String, Object> scenario) {
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Map<String, Port> ports = new HashMap<>();
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Map<String, NetzwerkInterface> nicsByPort = new HashMap<>();
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@@ -156,6 +165,9 @@ public class ScenarioNetwork {
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for (Object each : list(scenario.getOrDefault("dhcpClients", new ArrayList<>()))) {
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system(nodes.get((String) each)).setDHCPKonfiguration(true);
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}
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for (Object each : list(scenario.getOrDefault("rip", new ArrayList<>()))) {
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((VermittlungsrechnerBetriebssystem) system(nodes.get((String) each))).setRipEnabled(true);
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}
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}
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