feat(fls): DNS records from /dns/hosts, as Java's server answers them
Java's DNS server reads its records from the text file /dns/hosts on every query. dnsHosts.ts ports that reading (DNSServer.leseRecordListe, ResourceRecord, Dateisystem.holeDatei) and keeps in the model the records Java answers: type exactly A, MX or NS, and a name Java accepted. The file stays in the file system as it is. Both oracles read 76 hand-picked hosts files (dns-hosts.cases.txt): the Java oracle through DNSServer.holeResourceRecords (DnsHostsCases), the Swift oracle through TopologyDNSHostsFileCodec (--dns-hosts). The Java view matches Java on every case; the model matches Swift except for 33 named cases in twelve reasons: Java splits at single spaces and LF only, has no comments or "IN", turns a TTL that is no int into 3600, keeps duplicates, and empties names with a leading digit. The Swift dump now carries each server's records; the corpus comparison covers them on 16 files. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Claude Opus 5.5
@@ -180,10 +180,25 @@ export interface GnutellaConfiguration {
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readonly maximumKnownPeers: number;
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}
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/** The DNS records follow with the hosts file (Java's /dns/hosts). */
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export type DnsRecordType = 'A' | 'MX' | 'NS';
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/**
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* One record a DNS server answers with (Swift's TopologyDNSResourceRecord):
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* `name` in lower case without the final dot (the root is "."), `target` an
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* IPv4 address for A, an absolute name ("mail.filius.de.") for MX and NS.
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*/
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export interface DnsResourceRecord {
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readonly name: string;
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readonly type: DnsRecordType;
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readonly ttlSeconds: number;
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readonly target: string;
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}
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export interface DnsServerConfiguration {
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readonly recursiveResolutionEnabled: boolean;
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readonly forwardingServerIPAddress?: string;
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/** In the order of Java's /dns/hosts, which stays in the file system as it is. */
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readonly records: readonly DnsResourceRecord[];
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}
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/**
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@@ -0,0 +1,153 @@
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// Java's DNS server keeps its records in the text file /dns/hosts and reads
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// them on every query (DNSServer.leseRecordListe, ResourceRecord(String)).
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// Measured on test/dns-hosts.cases.txt against Java (dns-hosts.java.json)
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// and Swift (dns-hosts.swift.json); where the two differ, Java decides:
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// - fields are split at single spaces only: a tab or NBSP joins two fields;
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// - there are no comments, no "IN" and no zone-file order;
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// - a TTL that is not a Java int silently becomes 3600;
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// - a name Java does not accept becomes the empty name, and the record
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// still counts - it just never answers, like any record whose type is
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// not exactly A, MX or NS (lower-case "a" included);
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// - duplicates stay.
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import type { DnsResourceRecord } from '@mdg-filius/core';
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import { javaIpCheck, javaParseInt } from './javaIp.js';
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import type { FlsFileTree } from './systemSoftware.js';
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/** A record as Java's ResourceRecord holds it (the getters). */
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export interface JavaResourceRecord {
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readonly domainName: string;
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readonly type: string;
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readonly ttl: number;
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readonly rdata: string;
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}
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export const DNS_HOSTS_PATH = '/dns/hosts';
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// EingabenUeberpruefung.musterDomain, including its quirks: labels start with
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// a letter, labels after the first may hold a backslash, and the empty
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// string is a valid domain.
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const JAVA_DOMAIN = /^([a-zA-Z]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(\.[a-zA-Z]([a-zA-Z0-9\\-]{0,61}[a-zA-Z0-9])?)*)?\.?$/;
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// EingabenUeberpruefung.musterIpAdresse.
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const JAVA_IP_ADDRESS =
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/^(0*([1-9]?[0-9]?|1[0-9]{1,2}|2[0-4]?[0-9]|25[0-5]))\.((0*(1?[0-9]{1,2}|2[0-4]?[0-9]|25[0-5]))\.){2}(0*(1?[0-9]{1,2}|2[0-4]?[0-9]|25[0-5]))$/;
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/** `String.trim()`: every UTF-16 unit up to U+0020 off both ends. */
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function javaTrim(text: string): string {
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return text.replace(/^[\u0000-\u0020]+|[\u0000-\u0020]+$/g, '');
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}
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/**
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* The content of /dns/hosts as `Dateisystem.holeDatei` finds it: the first
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* node in preorder whose path equals it ignoring case, and only if that node
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* is a file. Undefined when there is none; a file without content reads as
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* empty (Java would fail on it).
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*/
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export function javaHostsFileContent(root: FlsFileTree | undefined): string | undefined {
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if (root === undefined) return undefined;
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const found = firstInPreorder(root, '', (path) => javaEqualsIgnoreCase(path, DNS_HOSTS_PATH));
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return found?.kind === 'file' ? (found.content ?? '') : undefined;
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}
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/** Preorder below the root; a node's path is "/" plus each name after the root's. */
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function firstInPreorder(node: FlsFileTree, path: string, matches: (path: string) => boolean): FlsFileTree | undefined {
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for (const child of node.children) {
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const childPath = `${path}/${child.kind === 'other' ? child.className : String(child.name)}`;
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if (matches(childPath)) return child;
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const found = firstInPreorder(child, childPath, matches);
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if (found !== undefined) return found;
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}
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return undefined;
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}
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/**
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* `String.equalsIgnoreCase` against an ASCII path, unit by unit: equal after
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* Character.toUpperCase, so the long s (U+017F) is an "s". Java also
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* compares the lower case of both; for the letters of /dns/hosts that adds
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* no unit (measured over the BMP).
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*/
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function javaEqualsIgnoreCase(text: string, asciiPath: string): boolean {
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if (text.length !== asciiPath.length) return false;
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for (let index = 0; index < text.length; index++) {
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if (text[index]!.toUpperCase() !== asciiPath[index]!.toUpperCase()) return false;
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}
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return true;
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}
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/** `DNSServer.leseRecordListe` on the content of /dns/hosts. */
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export function readJavaDnsHosts(content: string): JavaResourceRecord[] {
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const records: JavaResourceRecord[] = [];
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for (const token of content.split('\n')) {
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const line = javaTrim(token);
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// line.split(" ", 5).length < 4: fewer than three single spaces.
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if (line === '' || line.split(' ').length < 4) continue;
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const record = javaResourceRecord(line);
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if (isValidJavaRecord(record)) records.push(record);
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}
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return records;
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}
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/** `new ResourceRecord(line)`: up to four space-separated fields. */
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function javaResourceRecord(line: string): JavaResourceRecord {
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const fields = line.split(' ').filter((field) => field !== '').map(javaTrim);
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let domainName = '';
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let type = 'A';
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let ttl = 3600;
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let rdata = '';
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if (fields[0] !== undefined && JAVA_DOMAIN.test(fields[0])) {
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domainName = fields[0].endsWith('.') ? fields[0] : `${fields[0]}.`;
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}
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if (fields[1] !== undefined) type = fields[1];
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if (fields[2] !== undefined) ttl = javaParseInt(fields[2]) ?? ttl;
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if (fields[3] !== undefined) {
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// Java tests ".*\." (no line terminator before the dot); a target with
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// one fails the domain check anyway, so endsWith says the same.
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const needsDot = (type === 'NS' || type === 'MX') && !fields[3].endsWith('.');
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rdata = needsDot ? `${fields[3]}.` : fields[3];
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}
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return { domainName, type, ttl, rdata };
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}
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function isValidJavaRecord(record: JavaResourceRecord): boolean {
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switch (record.type) {
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case 'A':
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return JAVA_DOMAIN.test(record.domainName) && JAVA_IP_ADDRESS.test(record.rdata);
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case 'MX':
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case 'NS':
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return JAVA_DOMAIN.test(record.domainName) && JAVA_DOMAIN.test(record.rdata);
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default:
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return true;
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}
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}
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/**
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* The records Java answers with, in the model's form: Java looks them up by
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* type (exactly "A", "MX", "NS") and by name ignoring case, so a record with
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* the empty name or another type never answers and is left out. The file
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* itself stays as it is.
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*/
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export function dnsRecordsOf(records: readonly JavaResourceRecord[], warn: (message: string) => void): DnsResourceRecord[] {
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const answered: DnsResourceRecord[] = [];
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for (const record of records) {
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if (record.domainName === '') continue;
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const name = record.domainName === '.' ? '.' : record.domainName.slice(0, -1).toLowerCase();
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switch (record.type) {
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case 'A': {
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const address = javaIpCheck(record.rdata);
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if (address === null) {
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warn(`DNS record '${name} A ${record.rdata}' has no usable IPv4 address, left out (it stays in ${DNS_HOSTS_PATH})`);
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continue;
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}
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answered.push({ name, type: 'A', ttlSeconds: record.ttl, target: address });
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break;
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}
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case 'MX':
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case 'NS':
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answered.push({ name, type: record.type, ttlSeconds: record.ttl, target: record.rdata.toLowerCase() });
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break;
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default:
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break;
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}
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}
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return answered;
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}
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@@ -33,7 +33,10 @@
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// - a web server's files stay in /webserver (its document root), where Swift
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// moves them to /www; and no program state is written into a host's files
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// (Swift keeps Gnutella and e-mail state there as hidden JSON files).
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// Not here yet: DNS records (from /dns/hosts) and e-mail accounts.
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// - a DNS server's records are what Java's server answers from /dns/hosts
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// (see dnsHosts.ts); Swift reads the file its own way — tabs, comments,
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// "IN", names with a leading digit — and drops Java's duplicates.
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// Not here yet: e-mail accounts.
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import {
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canonicalMacAddress,
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@@ -88,6 +91,7 @@ import {
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type TopologyNode,
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type VirtualFileContent,
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} from '@mdg-filius/core';
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import { dnsRecordsOf, javaHostsFileContent, readJavaDnsHosts } from './dnsHosts.js';
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import type { FlsApplicationClass, FlsFileTree, FlsFirewall } from './systemSoftware.js';
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import type { FlsDocumentationItem, FlsInterface, FlsNode, FlsNodeClass, FlsTopology } from './topology.js';
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@@ -415,11 +419,15 @@ function registerPrograms(source: FlsNode, node: TopologyNode, system: SystemCon
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const forwarder = trimmedOrEmpty(source.interfaces[0]?.dns);
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const primary = trimmedOrEmpty(source.interfaces[0]?.ip);
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const forwarding = recursive && forwarder !== '' && forwarder !== primary;
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const hosts = javaHostsFileContent(source.system.fileSystem);
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const records = dnsRecordsOf(readJavaDnsHosts(hosts ?? ''), (message) =>
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warnings.push(`node '${node.displayName}': ${message}`),
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);
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system.dnsServerConfigurations.set(
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node.id,
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forwarding
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? { recursiveResolutionEnabled: recursive, forwardingServerIPAddress: forwarder }
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: { recursiveResolutionEnabled: recursive },
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? { recursiveResolutionEnabled: recursive, forwardingServerIPAddress: forwarder, records }
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: { recursiveResolutionEnabled: recursive, records },
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);
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break;
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}
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@@ -1,5 +1,6 @@
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// Public surface of the .fls codec.
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export * from './archive.js';
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export * from './dnsHosts.js';
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export * from './importProject.js';
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export * from './javaIp.js';
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export * from './javabeans.js';
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@@ -0,0 +1,76 @@
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www.filius.de. A 3600 1.2.3.4\u000A
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www.filius.de A 3600 1.2.3.4\u000A
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www.filius.de A 3600 1.2.3.4
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WWW.Filius.DE A 3600 1.2.3.4\u000A
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www.filius.de a 3600 1.2.3.4\u000A
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filius.de mx 3600 mail.filius.de\u000A
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www.filius.de A 3600 1.2.3.4\u000A
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www.filius.de\u0009A\u00093600\u00091.2.3.4\u000A
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www.filius.de A 3600 1.2.3.4 \u000A
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www.filius.de A 3600 1.2.3.4 # comment\u000A
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# www.filius.de A 3600 1.2.3.4\u000A
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www.filius.de A 3600 1.2.3.4#x\u000A
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www.filius.de A IN 3600 1.2.3.4\u000A
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www.filius.de 3600 IN A 1.2.3.4\u000A
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www.filius.de A x 1.2.3.4\u000A
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www.filius.de A -5 1.2.3.4\u000A
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www.filius.de A 0 1.2.3.4\u000A
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www.filius.de A +5 1.2.3.4\u000A
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www.filius.de A 4294967295 1.2.3.4\u000A
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www.filius.de A 99999999999 1.2.3.4\u000A
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www.filius.de A 3600 010.0.0.1\u000A
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www.filius.de A 3600 1.2.3\u000A
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www.filius.de A 3600 256.0.0.1\u000A
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www.filius.de A 3600 1.2.3.4.\u000A
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www.filius.de A 3600 1.2.3.4 extra\u000A
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www.filius.de A 3600\u000A
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1und1.de A 3600 1.2.3.4\u000A
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a_b.de A 3600 1.2.3.4\u000A
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-a.de A 3600 1.2.3.4\u000A
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a-.de A 3600 1.2.3.4\u000A
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www..de A 3600 1.2.3.4\u000A
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www.filius.de.. A 3600 1.2.3.4\u000A
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www.1und1.de A 3600 1.2.3.4\u000A
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www.a\u005Cb.de A 3600 1.2.3.4\u000A
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m\u00FCller.de A 3600 1.2.3.4\u000A
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aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.de A 3600 1.2.3.4\u000A
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aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.de A 3600 1.2.3.4\u000A
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localhost A 3600 127.0.0.1\u000A
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. NS 3600 dns-root.\u000A
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de NS 3600 dns.de\u000A
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de. NS 3600 .\u000A
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filius.de MX 3600 mail.filius.de\u000A
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filius.de MX 3600 10 mail.filius.de\u000A
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filius.de MX 3600 1.2.3.4\u000A
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filius.de CNAME 3600 www.filius.de\u000A
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filius.de TXT 3600 hello\u000A
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www.filius.de A 3600 1.2.3.4\u000Awww.filius.de A 3600 1.2.3.4\u000A
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www.filius.de A 3600 1.2.3.4\u000Awww.filius.de A 7200 1.2.3.4\u000A
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www.filius.de A 3600 1.2.3.4\u000AWWW.filius.de. A 3600 1.2.3.4\u000A
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www.filius.de A 3600 1.2.3.4\u000Awww.filius.de A 3600 1.2.3.5\u000A
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www.filius.de A 3600 1.2.3.4\u000D\u000Amail.filius.de A 3600 1.2.3.5\u000D\u000A
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www.filius.de A 3600 1.2.3.4\u000Dmail.filius.de A 3600 1.2.3.5\u000D
|
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www.filius.de A 3600 1.2.3.4\u2028mail.filius.de A 3600 1.2.3.5\u000A
|
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www.filius.de\u00A0A 3600 1.2.3.4\u000A
|
||||
www.filius.de A 3600 1.2.3.4\u0085\u000A
|
||||
|
||||
\u000A\u000Awww.filius.de A 3600 1.2.3.4\u000A\u000A
|
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filius.de. MX 3600 smtp.filius.de.\u000Adns-root. A 3600 141.99.5.13\u000A. NS 3600 dns-root.\u000A
|
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www.filius.de A \u0661\u0660 1.2.3.4\u000A
|
||||
www.filius.de A 2147483647 1.2.3.4\u000A
|
||||
www.filius.de A -2147483648 1.2.3.4\u000A
|
||||
www.filius.de A 2147483648 1.2.3.4\u000A
|
||||
www.filius.de \u0009 A 3600 1.2.3.4\u000A
|
||||
www.filius.de A \u0009 3600 1.2.3.4\u000A
|
||||
www.filius.de A 3600 1.2.3.4 \u0009\u000A
|
||||
www.filius.de A 3600 1.2.3.4\u000A
|
||||
www.filius.de A 3600 1.2.3.4\u000A
|
||||
www.filius.de A 3600 0.0.0.0\u000A
|
||||
www.filius.de A 3600 00000000000000000001.2.3.4\u000A
|
||||
filius.de NS 3600 dns..de\u000A
|
||||
filius.de NS 3600 dns.filius.de..\u000A
|
||||
filius.de. MX 3600 Mail.Filius.DE.\u000A
|
||||
www.filius.de A 3600 .1.2.3\u000A
|
||||
www.filius.de A 3600 1.2.3.4\u0001\u000A
|
||||
www.filius.de A 3600 1.2.3.4\u00A0\u000A
|
||||
\u001Fwww.filius.de A 3600 1.2.3.4\u000A
|
||||
@@ -0,0 +1,754 @@
|
||||
[
|
||||
[
|
||||
"www.filius.de. A 3600 1.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de.",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de.",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4",
|
||||
[
|
||||
[
|
||||
"www.filius.de.",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"WWW.Filius.DE A 3600 1.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"WWW.Filius.DE.",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de a 3600 1.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de.",
|
||||
"a",
|
||||
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|
||||
3600,
|
||||
"1.2.3.4"
|
||||
],
|
||||
[
|
||||
"mail.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.5"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4\\u000Dmail.filius.de A 3600 1.2.3.5\\u000D",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
],
|
||||
[
|
||||
"mail.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.5"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4\\u2028mail.filius.de A 3600 1.2.3.5\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
],
|
||||
[
|
||||
"mail.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.5"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de\\u00A0A 3600 1.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4\\u0085\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"",
|
||||
[
|
||||
|
||||
]
|
||||
],
|
||||
[
|
||||
"\\u000A\\u000Awww.filius.de A 3600 1.2.3.4\\u000A\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"filius.de. MX 3600 smtp.filius.de.\\u000Adns-root. A 3600 141.99.5.13\\u000A. NS 3600 dns-root.\\u000A",
|
||||
[
|
||||
[
|
||||
"filius.de",
|
||||
"MX",
|
||||
3600,
|
||||
"smtp.filius.de."
|
||||
],
|
||||
[
|
||||
"dns-root",
|
||||
"A",
|
||||
3600,
|
||||
"141.99.5.13"
|
||||
],
|
||||
[
|
||||
".",
|
||||
"NS",
|
||||
3600,
|
||||
"dns-root."
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A \\u0661\\u0660 1.2.3.4\\u000A",
|
||||
[
|
||||
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 2147483647 1.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
2147483647,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A -2147483648 1.2.3.4\\u000A",
|
||||
[
|
||||
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 2147483648 1.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
2147483648,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de \\u0009 A 3600 1.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A \\u0009 3600 1.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4 \\u0009\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 0.0.0.0\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"0.0.0.0"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 00000000000000000001.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"filius.de NS 3600 dns..de\\u000A",
|
||||
[
|
||||
|
||||
]
|
||||
],
|
||||
[
|
||||
"filius.de NS 3600 dns.filius.de..\\u000A",
|
||||
[
|
||||
[
|
||||
"filius.de",
|
||||
"NS",
|
||||
3600,
|
||||
"dns.filius.de."
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"filius.de. MX 3600 Mail.Filius.DE.\\u000A",
|
||||
[
|
||||
[
|
||||
"filius.de",
|
||||
"MX",
|
||||
3600,
|
||||
"mail.filius.de."
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 .1.2.3\\u000A",
|
||||
[
|
||||
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4\\u0001\\u000A",
|
||||
[
|
||||
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4\\u00A0\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
|
||||
3600,
|
||||
"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"\\u001Fwww.filius.de A 3600 1.2.3.4\\u000A",
|
||||
[
|
||||
|
||||
]
|
||||
]
|
||||
]
|
||||
@@ -0,0 +1,209 @@
|
||||
// Java's reading of /dns/hosts (DNSServer.leseRecordListe): every case in
|
||||
// dns-hosts.cases.txt was run through Java (dns-hosts.java.json) and through
|
||||
// Swift's hosts-file codec (dns-hosts.swift.json, tools/swift-oracle). The
|
||||
// Java view must match Java exactly; the records the model keeps must match
|
||||
// Swift except where Java answers differently — each case named below.
|
||||
|
||||
import { readFileSync } from 'node:fs';
|
||||
import { dirname, join } from 'node:path';
|
||||
import { fileURLToPath } from 'node:url';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import type { FlsFileTree } from '../src/index.js';
|
||||
import { dnsRecordsOf, javaHostsFileContent, readJavaDnsHosts } from '../src/dnsHosts.js';
|
||||
|
||||
const here = dirname(fileURLToPath(import.meta.url));
|
||||
type Row = [string, string, number, string];
|
||||
const javaMeasured = JSON.parse(readFileSync(join(here, 'dns-hosts.java.json'), 'utf8')) as [string, Row[]][];
|
||||
const swiftMeasured = JSON.parse(readFileSync(join(here, 'dns-hosts.swift.json'), 'utf8')) as [string, Row[]][];
|
||||
|
||||
/** The cases file's escapes: a backslash, `u` and four hex digits for one UTF-16 unit. */
|
||||
function unescape(line: string): string {
|
||||
return line.replace(/\\u([0-9a-fA-F]{4})/g, (_, hex: string) => String.fromCharCode(Number.parseInt(hex, 16)));
|
||||
}
|
||||
|
||||
function modelRows(line: string, warnings: string[] = []): Row[] {
|
||||
return dnsRecordsOf(readJavaDnsHosts(unescape(line)), (message) => warnings.push(message)).map((record) => [
|
||||
record.name,
|
||||
record.type,
|
||||
record.ttlSeconds,
|
||||
record.target,
|
||||
]);
|
||||
}
|
||||
|
||||
/** Lines Swift reads as records that Java never answers. */
|
||||
const SWIFT_READS_JAVA_NEVER_ANSWERS: { reason: string; lines: string[] }[] = [
|
||||
{
|
||||
reason: 'a type in lower case is another type in Java, which never answers',
|
||||
lines: [
|
||||
String.raw`www.filius.de a 3600 1.2.3.4\u000A`,
|
||||
String.raw`filius.de mx 3600 mail.filius.de\u000A`,
|
||||
],
|
||||
},
|
||||
{
|
||||
reason: 'Java splits fields at single spaces only: a tab or NBSP is part of a field',
|
||||
lines: [
|
||||
String.raw`www.filius.de\u0009A\u00093600\u00091.2.3.4\u000A`,
|
||||
String.raw`www.filius.de\u00A0A 3600 1.2.3.4\u000A`,
|
||||
String.raw`www.filius.de A 3600 1.2.3.4\u00A0\u000A`,
|
||||
String.raw`www.filius.de \u0009 A 3600 1.2.3.4\u000A`,
|
||||
String.raw`www.filius.de A \u0009 3600 1.2.3.4\u000A`,
|
||||
],
|
||||
},
|
||||
{
|
||||
reason: 'Java splits lines at LF only: CR, LS and NEL stay in the line',
|
||||
lines: [
|
||||
String.raw`www.filius.de A 3600 1.2.3.4\u000Dmail.filius.de A 3600 1.2.3.5\u000D`,
|
||||
String.raw`www.filius.de A 3600 1.2.3.4\u2028mail.filius.de A 3600 1.2.3.5\u000A`,
|
||||
String.raw`www.filius.de A 3600 1.2.3.4\u0085\u000A`,
|
||||
],
|
||||
},
|
||||
{
|
||||
reason: 'Java has no comments, no "IN" and no zone-file order',
|
||||
lines: [
|
||||
String.raw`www.filius.de A 3600 1.2.3.4#x\u000A`,
|
||||
String.raw`www.filius.de A IN 3600 1.2.3.4\u000A`,
|
||||
String.raw`www.filius.de 3600 IN A 1.2.3.4\u000A`,
|
||||
],
|
||||
},
|
||||
{
|
||||
reason: 'a label that starts with a digit, or two final dots, make the name empty in Java',
|
||||
lines: [
|
||||
String.raw`1und1.de A 3600 1.2.3.4\u000A`,
|
||||
String.raw`www.1und1.de A 3600 1.2.3.4\u000A`,
|
||||
String.raw`www.filius.de.. A 3600 1.2.3.4\u000A`,
|
||||
],
|
||||
},
|
||||
{
|
||||
reason: 'an MX or NS target must be a name Java accepts: no preference, no address, one final dot',
|
||||
lines: [
|
||||
String.raw`filius.de MX 3600 10 mail.filius.de\u000A`,
|
||||
String.raw`filius.de MX 3600 1.2.3.4\u000A`,
|
||||
String.raw`filius.de NS 3600 dns.filius.de..\u000A`,
|
||||
],
|
||||
},
|
||||
];
|
||||
|
||||
/** Lines Java answers that Swift drops or reads otherwise. */
|
||||
const JAVA_ANSWERS_SWIFT_DROPS: { reason: string; lines: string[] }[] = [
|
||||
{
|
||||
reason: 'a TTL that is no Java int is 3600',
|
||||
lines: [
|
||||
String.raw`www.filius.de A x 1.2.3.4\u000A`,
|
||||
String.raw`www.filius.de A 4294967295 1.2.3.4\u000A`,
|
||||
String.raw`www.filius.de A 99999999999 1.2.3.4\u000A`,
|
||||
String.raw`www.filius.de A 2147483648 1.2.3.4\u000A`,
|
||||
],
|
||||
},
|
||||
{
|
||||
reason: 'a TTL is Java\'s Integer.parseInt: negative, and in any script\'s digits',
|
||||
lines: [
|
||||
String.raw`www.filius.de A -5 1.2.3.4\u000A`,
|
||||
String.raw`www.filius.de A -2147483648 1.2.3.4\u000A`,
|
||||
String.raw`www.filius.de A \u0661\u0660 1.2.3.4\u000A`,
|
||||
],
|
||||
},
|
||||
{
|
||||
reason: 'labels after the first may hold a backslash (Java\'s domain pattern)',
|
||||
lines: [
|
||||
String.raw`www.a\u005Cb.de A 3600 1.2.3.4\u000A`,
|
||||
],
|
||||
},
|
||||
{
|
||||
reason: 'Java trims control characters off a line (String.trim)',
|
||||
lines: [
|
||||
String.raw`www.filius.de A 3600 1.2.3.4\u0001\u000A`,
|
||||
String.raw`\u001Fwww.filius.de A 3600 1.2.3.4\u000A`,
|
||||
],
|
||||
},
|
||||
{
|
||||
reason: 'an NS record may name the root',
|
||||
lines: [
|
||||
String.raw`de. NS 3600 .\u000A`,
|
||||
],
|
||||
},
|
||||
{
|
||||
reason: 'duplicates stay, as in Java\'s list',
|
||||
lines: [
|
||||
String.raw`www.filius.de A 3600 1.2.3.4\u000Awww.filius.de A 3600 1.2.3.4\u000A`,
|
||||
String.raw`www.filius.de A 3600 1.2.3.4\u000Awww.filius.de A 7200 1.2.3.4\u000A`,
|
||||
String.raw`www.filius.de A 3600 1.2.3.4\u000AWWW.filius.de. A 3600 1.2.3.4\u000A`,
|
||||
],
|
||||
},
|
||||
];
|
||||
|
||||
const departures = new Map(
|
||||
[...SWIFT_READS_JAVA_NEVER_ANSWERS, ...JAVA_ANSWERS_SWIFT_DROPS].flatMap(({ reason, lines }) =>
|
||||
lines.map((line) => [line, reason] as const),
|
||||
),
|
||||
);
|
||||
|
||||
describe('readJavaDnsHosts against Java', () => {
|
||||
it('covers every line of the cases file, in both oracles', () => {
|
||||
const lines = readFileSync(join(here, 'dns-hosts.cases.txt'), 'ascii').split('\n').slice(0, -1);
|
||||
expect(javaMeasured.map(([line]) => line)).toEqual(lines);
|
||||
expect(swiftMeasured.map(([line]) => line)).toEqual(lines);
|
||||
});
|
||||
|
||||
for (const [line, expected] of javaMeasured) {
|
||||
it(JSON.stringify(line), () => {
|
||||
const records = readJavaDnsHosts(unescape(line));
|
||||
expect(records.map((record) => [record.domainName, record.type, record.ttl, record.rdata])).toEqual(expected);
|
||||
});
|
||||
}
|
||||
});
|
||||
|
||||
describe('the records the model keeps, against Swift', () => {
|
||||
it('names only cases of the cases file as departures', () => {
|
||||
const lines = new Set(swiftMeasured.map(([line]) => line));
|
||||
expect([...departures.keys()].filter((line) => !lines.has(line))).toEqual([]);
|
||||
});
|
||||
|
||||
for (const [line, swift] of swiftMeasured) {
|
||||
const reason = departures.get(line);
|
||||
it(reason === undefined ? JSON.stringify(line) : `${JSON.stringify(line)} (departs: ${reason})`, () => {
|
||||
if (reason === undefined) expect(modelRows(line)).toEqual(swift);
|
||||
else expect(modelRows(line)).not.toEqual(swift);
|
||||
});
|
||||
}
|
||||
});
|
||||
|
||||
describe('the records Java answers', () => {
|
||||
it('leave out records Java never answers: an empty name, or a type other than A, MX, NS', () => {
|
||||
expect(modelRows(String.raw`1und1.de A 3600 1.2.3.4\u000Afilius.de CNAME 3600 www.filius.de\u000Afilius.de a 3600 1.2.3.4`)).toEqual([]);
|
||||
});
|
||||
|
||||
it('take names in lower case without the final dot, A targets as FILIUS normalises addresses', () => {
|
||||
expect(modelRows(String.raw`WWW.Filius.DE. A 60 010.000.0.1\u000Afilius.de MX 3600 Mail.Filius.DE\u000A. NS 3600 dns-root`)).toEqual([
|
||||
['www.filius.de', 'A', 60, '10.0.0.1'],
|
||||
['filius.de', 'MX', 3600, 'mail.filius.de.'],
|
||||
['.', 'NS', 3600, 'dns-root.'],
|
||||
]);
|
||||
});
|
||||
|
||||
it('warn about an A record Java answers with an address FILIUS cannot use', () => {
|
||||
const warnings: string[] = [];
|
||||
expect(modelRows(String.raw`www.filius.de A 3600 .1.2.3`, warnings)).toEqual([]);
|
||||
expect(warnings).toEqual(["DNS record 'www.filius.de A .1.2.3' has no usable IPv4 address, left out (it stays in /dns/hosts)"]);
|
||||
});
|
||||
});
|
||||
|
||||
describe('javaHostsFileContent', () => {
|
||||
const file = (name: string, content: string | null): FlsFileTree => ({ kind: 'file', name, type: 'text', content, children: [] });
|
||||
const directory = (name: string, ...children: FlsFileTree[]): FlsFileTree => ({ kind: 'directory', name, children });
|
||||
|
||||
it('finds /dns/hosts ignoring case, as Java does', () => {
|
||||
expect(javaHostsFileContent(directory('root', directory('DNS', file('Hosts', 'x'))))).toBe('x');
|
||||
expect(javaHostsFileContent(directory('root', directory('dns', file('ho\u017Fts', 'long s'))))).toBe('long s');
|
||||
});
|
||||
|
||||
it('takes the first match in preorder, and nothing when that is a directory', () => {
|
||||
expect(javaHostsFileContent(directory('root', directory('dns', file('hosts', 'first')), directory('DNS', file('hosts', 'second'))))).toBe('first');
|
||||
expect(javaHostsFileContent(directory('root', directory('dns', directory('hosts'), file('HOSTS', 'later'))))).toBeUndefined();
|
||||
});
|
||||
|
||||
it('is undefined without the file, and empty for a file without content', () => {
|
||||
expect(javaHostsFileContent(undefined)).toBeUndefined();
|
||||
expect(javaHostsFileContent(directory('root', file('hosts', 'x')))).toBeUndefined();
|
||||
expect(javaHostsFileContent(directory('root', directory('dns', file('hosts', null))))).toBe('');
|
||||
});
|
||||
});
|
||||
@@ -145,6 +145,7 @@ function systemOf(project: ImportedProject, nodeId: Id) {
|
||||
result.dnsServer = {
|
||||
recursiveResolutionEnabled: dns.recursiveResolutionEnabled,
|
||||
forwardingServerIPAddress: dns.forwardingServerIPAddress ?? null,
|
||||
records: dns.records.map((record) => [record.name, record.type, record.ttlSeconds, record.target]),
|
||||
};
|
||||
}
|
||||
const remoteLink = project.remoteLinkConfigurations.get(nodeId);
|
||||
@@ -787,12 +788,39 @@ describe('importProject rules', () => {
|
||||
expect(project.simpleClientConfigurations.get(notebook!)).toEqual({ targetAddress: '10.0.0.9', targetPort: 7 });
|
||||
expect(project.firewallConfigurationsByNodeId.get(notebook!)).toMatchObject({ isActive: true, defaultPolicy: 'accept' });
|
||||
expect([forwarding, self, iterative].map((id) => project.dnsServerConfigurations.get(id!))).toEqual([
|
||||
{ recursiveResolutionEnabled: true, forwardingServerIPAddress: '8.8.8.8' },
|
||||
{ recursiveResolutionEnabled: true },
|
||||
{ recursiveResolutionEnabled: false },
|
||||
{ recursiveResolutionEnabled: true, forwardingServerIPAddress: '8.8.8.8', records: [] },
|
||||
{ recursiveResolutionEnabled: true, records: [] },
|
||||
{ recursiveResolutionEnabled: false, records: [] },
|
||||
]);
|
||||
});
|
||||
|
||||
it("takes a DNS server's records from its /dns/hosts, and names the node in a warning", () => {
|
||||
const hosts = 'www.filius.de A 3600 141.99.2.10\nfilius.de MX 3600 mail.filius.de\nbroken.de A 3600 .1.2.3\n';
|
||||
const server = flsNode('Rechner', {
|
||||
name: 'DNS',
|
||||
interfaces: [nic('10.0.0.1')],
|
||||
system: {
|
||||
applications: [{ key: 'dns', javaClass: 'filius.software.dns.DNSServer', source: flsNode('Rechner').source, isActive: true }],
|
||||
fileSystem: {
|
||||
kind: 'directory',
|
||||
name: 'root',
|
||||
children: [
|
||||
{ kind: 'directory', name: 'dns', children: [{ kind: 'file', name: 'hosts', type: 'text', content: hosts, children: [] }] },
|
||||
],
|
||||
},
|
||||
},
|
||||
});
|
||||
const project = importProject(topology({ nodes: [server] }), counter());
|
||||
const [id] = project.graph.nodes.map((node) => node.id);
|
||||
|
||||
expect(project.dnsServerConfigurations.get(id!)?.records).toEqual([
|
||||
{ name: 'www.filius.de', type: 'A', ttlSeconds: 3600, target: '141.99.2.10' },
|
||||
{ name: 'filius.de', type: 'MX', ttlSeconds: 3600, target: 'mail.filius.de.' },
|
||||
]);
|
||||
expect(project.virtualFileSystems.get(id!)?.textFile('/dns/hosts')).toBe(hosts);
|
||||
expect(project.warnings).toEqual(["node 'DNS': DNS record 'broken.de A .1.2.3' has no usable IPv4 address, left out (it stays in /dns/hosts)"]);
|
||||
});
|
||||
|
||||
it('leaves out a cable to itself and one to a port that already has a cable', () => {
|
||||
const project = importProject(
|
||||
topology({
|
||||
|
||||
Reference in New Issue
Block a user