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
@@ -0,0 +1,76 @@
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||||
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||||
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||||
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||||
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|
||||
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||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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|
||||
[
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||||
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||||
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||||
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||||
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||||
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|
||||
[
|
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|
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
[
|
||||
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|
||||
[
|
||||
[
|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
[
|
||||
"de NS 3600 dns.de\\u000A",
|
||||
[
|
||||
[
|
||||
"de",
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
[
|
||||
"de. NS 3600 .\\u000A",
|
||||
[
|
||||
|
||||
]
|
||||
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|
||||
[
|
||||
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||||
[
|
||||
[
|
||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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|
||||
[
|
||||
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||||
[
|
||||
[
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||||
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|
||||
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||||
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|
||||
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||||
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||||
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||||
[
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||||
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[
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[
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[
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[
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"www.filius.de",
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[
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[
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[
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"www.filius.de",
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],
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[
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||||
"www.filius.de",
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"A",
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||||
]
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[
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||||
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[
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||||
"www.filius.de",
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||||
],
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||||
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||||
"mail.filius.de",
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||||
[
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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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[
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||||
"www.filius.de",
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],
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[
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],
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[
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||||
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[
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]
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],
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[
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[
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[
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[
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[
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]
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]
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],
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[
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||||
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[
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[
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"filius.de",
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],
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[
|
||||
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],
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[
|
||||
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"NS",
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]
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[
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"www.filius.de A \\u0661\\u0660 1.2.3.4\\u000A",
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[
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]
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],
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[
|
||||
"www.filius.de A 2147483647 1.2.3.4\\u000A",
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[
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[
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"www.filius.de",
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"A",
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]
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]
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],
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[
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"www.filius.de A -2147483648 1.2.3.4\\u000A",
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[
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]
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],
|
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[
|
||||
"www.filius.de A 2147483648 1.2.3.4\\u000A",
|
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[
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||||
[
|
||||
"www.filius.de",
|
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"A",
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2147483648,
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"1.2.3.4"
|
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]
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||||
]
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||||
],
|
||||
[
|
||||
"www.filius.de \\u0009 A 3600 1.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
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"A",
|
||||
3600,
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"1.2.3.4"
|
||||
]
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||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A \\u0009 3600 1.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
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|
||||
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]
|
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]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4 \\u0009\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
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||||
3600,
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"1.2.3.4"
|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4\\u000A",
|
||||
[
|
||||
[
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||||
"www.filius.de",
|
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"A",
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3600,
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||||
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|
||||
]
|
||||
]
|
||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
||||
"A",
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3600,
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||||
]
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]
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||||
],
|
||||
[
|
||||
"www.filius.de A 3600 0.0.0.0\\u000A",
|
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[
|
||||
[
|
||||
"www.filius.de",
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"A",
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3600,
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"0.0.0.0"
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]
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]
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],
|
||||
[
|
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"www.filius.de A 3600 00000000000000000001.2.3.4\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
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||||
"A",
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3600,
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"1.2.3.4"
|
||||
]
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]
|
||||
],
|
||||
[
|
||||
"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",
|
||||
[
|
||||
|
||||
]
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||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4\\u0001\\u000A",
|
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[
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|
||||
]
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||||
],
|
||||
[
|
||||
"www.filius.de A 3600 1.2.3.4\\u00A0\\u000A",
|
||||
[
|
||||
[
|
||||
"www.filius.de",
|
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"A",
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3600,
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]
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]
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],
|
||||
[
|
||||
"\\u001Fwww.filius.de A 3600 1.2.3.4\\u000A",
|
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[
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||||
|
||||
]
|
||||
]
|
||||
]
|
||||
@@ -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