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feat(core): modems run — the pair in the project, and a modem of another project hands its frames on (K0–K2)

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Measured first: tools/java-oracle's ModemRun joins two networks by a pair
of Java modems over TCP on localhost. The modem has no card and adds no
delay of its own — a frame takes the cables on both sides, nothing more.

The core pairs the two enabled modems on a port (Swift's inProject, with
its conditions and cycle suppression) on Java's timing: no 20 ms. The
modem example of FILIUS now pings through instead of failing the core.
A modem of another project (relay) gives its frames to whoever runs the
engine and puts on its cable what comes back, with this engine's frame
and packet numbers; a frame dies after MAXIMUM_RELAY_HOPS trips.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
julian.kiedaisch
2026-10-11 18:12:27 +00:00
co-authored by Claude Opus 5.5
parent 6f583616f6
commit c85b0e45da
19 changed files with 1743 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tools/java-oracle/src/ModemRun.java
+81
View File
@@ -0,0 +1,81 @@
// Runs a story on modem-lan's network in Java FILIUS (ScenarioNetwork): two
// networks joined by a pair of modems, a server and a client on localhost
// (ModemFirmware over a real TCP socket). Records every frame each card saw
// and when each call started and ended.
//
// ModemRun <scenario.json> <story> <milliseconds> <out.json>
//
// 10.0.0.1 and 10.0.0.3 sit on a switch with the server modem; 10.0.0.2 is
// cabled straight to the client modem. The stories:
// ping the modems connected, 10.0.0.1 pings 10.0.0.2 twice
// unconnected the modems not connected, 10.0.0.1 pings 10.0.0.2: ARP
// goes into the modem and no further
import filius.software.vermittlungsschicht.IcmpPaket;
import java.util.ArrayList;
import java.util.List;
public class ModemRun {
static final String HOST = "00000000-0000-0000-0000-000000000401";
static ScenarioNetwork network;
static final List<Object[]> events = new ArrayList<>();
interface Call {
String run() throws Exception;
}
static synchronized void event(String what) {
events.add(new Object[] { System.currentTimeMillis() - network.start, what });
}
static void call(String label, Call call) {
event(label + " called");
try {
event(label + " returned " + call.run());
} catch (Exception e) {
event(label + " failed " + e.getClass().getSimpleName());
}
}
static String icmp(IcmpPaket packet) {
return packet == null ? "null" : "ICMP " + packet.getIcmpType() + "/" + packet.getIcmpCode() + " from " + packet.getSender();
}
public static void main(String[] args) throws Exception {
network = ScenarioNetwork.read(args[0]);
String story = args[1];
long end = Long.parseLong(args[2]);
// Connected in the design, as one does with the settings panel's button before starting.
if (!story.equals("unconnected")) network.connectModems();
network.start();
Thread.sleep(500);
switch (story) {
case "ping":
call("sendProbe 10.0.0.2", () -> icmp(network.system(HOST).holeICMP().sendProbe("10.0.0.2", 64, 1, 1)));
call("sendProbe 10.0.0.2", () -> icmp(network.system(HOST).holeICMP().sendProbe("10.0.0.2", 64, 1, 2)));
break;
case "unconnected":
call("sendProbe 10.0.0.2", () -> icmp(network.system(HOST).holeICMP().sendProbe("10.0.0.2", 64, 1, 1)));
break;
default:
throw new IllegalArgumentException("unknown story " + story);
}
long rest = network.start + end - System.currentTimeMillis();
if (rest > 0) Thread.sleep(rest);
ScenarioNetwork.Json out = new ScenarioNetwork.Json();
out.open('{');
network.writeFrames(out);
synchronized (ModemRun.class) {
out.key("events").open('[');
for (Object[] each : events) out.open('[').number((Long) each[0]).string((String) each[1]).close(']');
out.close(']');
}
out.close('}');
network.stop();
ScenarioNetwork.write(args[3], out);
System.exit(0);
}
}
tools/java-oracle/src/ScenarioNetwork.java
+33
View File
@@ -17,6 +17,7 @@ import filius.hardware.knoten.Gateway;
import filius.hardware.knoten.InternetKnoten;
import filius.hardware.knoten.Knoten;
import filius.hardware.knoten.LokalerKnoten;
import filius.hardware.knoten.Modem;
import filius.hardware.knoten.Notebook;
import filius.hardware.knoten.Rechner;
import filius.hardware.knoten.Switch;
@@ -30,6 +31,7 @@ import filius.software.netzzugangsschicht.EthernetFrame;
import filius.software.system.Betriebssystem;
import filius.software.system.GatewayFirmware;
import filius.software.system.InternetKnotenBetriebssystem;
import filius.software.system.ModemFirmware;
import filius.software.system.SwitchFirmware;
import filius.software.system.VermittlungsrechnerBetriebssystem;
import filius.software.transportschicht.Segment;
@@ -58,6 +60,8 @@ public class ScenarioNetwork {
/** Each card's MAC address, under its node's id (the first card) or `id#index` (the others). */
final Map<String, String> macByNode = new LinkedHashMap<>();
final List<String> servers = new ArrayList<>();
/** The modems of the scenario, servers and clients. */
final List<String> modems = new ArrayList<>();
/** Loaded from a .fls file (fromFile): started as the action mode starts it, in the file's order. */
boolean fromFile;
/** fromFile: each card's MAC address and its node's name with the card's index, `name/index`. */
@@ -136,6 +140,10 @@ public class ScenarioNetwork {
// Its first card is the WAN port, its second the LAN port.
knoten = new Gateway();
break;
case "remoteLink":
// Java's modem: one port, no card; it joins its partner over TCP (modems below).
knoten = new Modem();
break;
default:
throw new IllegalArgumentException("node kind " + kind + " is not built by this tool");
}
@@ -235,6 +243,17 @@ public class ScenarioNetwork {
for (Object each : list(scenario.getOrDefault("rip", new ArrayList<>()))) {
((VermittlungsrechnerBetriebssystem) system(nodes.get((String) each))).setRipEnabled(true);
}
// Modems: Java pairs a server and a client over TCP on the port (the client
// connects to ipAdresse); connectModems() makes the connection, as the
// button of the settings panel does.
for (Map.Entry<String, Object> entry : map(scenario.getOrDefault("modems", new HashMap<>())).entrySet()) {
Map<String, Object> config = map(entry.getValue());
ModemFirmware firmware = (ModemFirmware) nodes.get(entry.getKey()).getSystemSoftware();
firmware.setMode("server".equals(config.get("mode")) ? ModemFirmware.SERVER : ModemFirmware.CLIENT);
firmware.setPort(((Number) config.get("port")).intValue());
firmware.setIpAdresse("localhost");
modems.add(entry.getKey());
}
// Firewalls: the core's defaults (inactive, drop, ICMP through, SYN only, UDP filtered) and its rules.
for (Map.Entry<String, Object> entry : map(scenario.getOrDefault("firewalls", new HashMap<>())).entrySet()) {
Map<String, Object> config = map(entry.getValue());
@@ -285,6 +304,20 @@ public class ScenarioNetwork {
}
}
/** Every server modem listens, then every client connects (JModemKonfiguration's button). */
void connectModems() throws InterruptedException {
for (String id : modems) {
ModemFirmware firmware = (ModemFirmware) nodes.get(id).getSystemSoftware();
if (firmware.getMode() == ModemFirmware.SERVER) firmware.starteServer();
}
Thread.sleep(300);
for (String id : modems) {
ModemFirmware firmware = (ModemFirmware) nodes.get(id).getSystemSoftware();
if (firmware.getMode() == ModemFirmware.CLIENT) firmware.starteClient();
}
Thread.sleep(300);
}
InternetKnotenBetriebssystem system(String nodeId) {
return (InternetKnotenBetriebssystem) nodes.get(nodeId).getSystemSoftware();
}