julian.kiedaischandClaude Opus 5.5
313786e738
The resolver runs on the events now (a query, its dnsQueryTimeout, its answer at the socket); the blocking resolveDns waits for it, and a recursive server uses it: its own records, else the zone's name server from its records, else its own DNS server, else a referral (DNSServer.answerWithRemoteData). DnsRun plays five stories on the new dns-recursive network. Measured and not taken: a server that is its zone's name server asks itself, which asks itself again, without end (the client times out, then every level floods its own DNS server); Java guards only the step through its own DNS server. The core asks itself in neither step. That story is compared up to the client's query (JAVA_UNTIL). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
98 lines
4.0 KiB
Java
98 lines
4.0 KiB
Java
// Runs a DNS lookup on dns-lan's network in Java FILIUS (ScenarioNetwork)
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// and records what really happens: every frame each card saw, and when the
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// resolver's call started and what it returned (or that it failed).
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//
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// DnsRun <scenario.json> <story> <milliseconds> <out.json>
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//
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// Server 192.168.0.10 knows web.filius.de, filius.de's mail exchange and
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// refers schule.de to 192.168.0.11, which knows www.schule.de. The stories,
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// each the resolver of a client (Resolver, as FILIUS' programs call it):
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// address 192.168.0.20 asks for web.filius.de (A)
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// mail 192.168.0.20 asks for filius.de's mail server (MX, then its A)
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// referral 192.168.0.20 asks for www.schule.de (A), referred to .11
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// unknown 192.168.0.20 asks for x.unbekannt.org, which no one knows
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// noServer 192.168.0.21 asks its DNS server 192.168.0.99, which is not there
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//
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// On dns-recursive's network .10 resolves recursively, its own DNS server is
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// .11, and it holds filius.de's NS record, which names itself. There also:
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// unknownInZone 192.168.0.20 asks for nix.schule.de, which .11 does not know
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// unknownInOwnZone 192.168.0.20 asks for nix.filius.de, in .10's own zone
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import filius.software.dns.Resolver;
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import java.util.ArrayList;
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import java.util.List;
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public class DnsRun {
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static final String CLIENT = "00000000-0000-0000-0000-000000000101";
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static final String LOST_CLIENT = "00000000-0000-0000-0000-000000000104";
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static ScenarioNetwork network;
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static final List<Object[]> events = new ArrayList<>();
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interface Call {
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String run() throws Exception;
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}
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static 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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static void call(String label, Call call) {
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event(label + " called");
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try {
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event(label + " returned " + call.run());
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} catch (Exception e) {
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event(label + " failed " + e.getClass().getSimpleName());
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}
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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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network.start();
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Thread.sleep(500);
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Resolver client = network.system(CLIENT).holeDNSClient();
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switch (story) {
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case "address":
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call("holeIPAdresse web.filius.de", () -> client.holeIPAdresse("web.filius.de"));
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break;
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case "mail":
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call("holeIPAdresseMailServer filius.de", () -> client.holeIPAdresseMailServer("filius.de"));
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break;
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case "referral":
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call("holeIPAdresse www.schule.de", () -> client.holeIPAdresse("www.schule.de"));
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break;
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case "unknown":
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call("holeIPAdresse x.unbekannt.org", () -> client.holeIPAdresse("x.unbekannt.org"));
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break;
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case "unknownInZone":
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call("holeIPAdresse nix.schule.de", () -> client.holeIPAdresse("nix.schule.de"));
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break;
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case "unknownInOwnZone":
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call("holeIPAdresse nix.filius.de", () -> client.holeIPAdresse("nix.filius.de"));
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break;
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case "noServer":
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Resolver lost = network.system(LOST_CLIENT).holeDNSClient();
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call("holeIPAdresse web.filius.de", () -> lost.holeIPAdresse("web.filius.de"));
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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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long rest = network.start + end - System.currentTimeMillis();
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if (rest > 0) Thread.sleep(rest);
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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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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.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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