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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 | 4x 149x 4x 4x 4x 4x 42x 42x 19x 2x 2x 2x 4x 2x 2x 2x 2x 2x 2x 1x 4x 16x 16x 16x 16x 16x 4x 20x 20x 20x 8x 1x 1x 1x 1x 2x 1x 1x 1x 1x 1x 1x 4x 5x 5x 8x 8x 5x 4x 4x 5x 5x 3x 2x 3x 12x 3x | import type { DnsRecord } from "./types.js";
const normalize = (input: string): string =>
input.trim().replace(/\.$/, "").toLowerCase();
export const normalizeDomain = normalize;
export const normalizeName = normalize;
export const normalizeHost = normalize;
export const recordComparableValue = (record: DnsRecord): string => {
const type = record.type.toUpperCase();
switch (type) {
case "A":
case "AAAA":
return String(record.address ?? "").trim();
case "ALIAS":
return normalizeHost(String(record.aliasName ?? ""));
case "CAA":
return `${Number(record.flag ?? 0)}:${String(record.tag ?? "")}:${String(record.value ?? "")}`;
case "CNAME":
return normalizeHost(String(record.cname ?? ""));
case "HTTPS":
case "SVCB":
return [
String(record.svcPriority ?? ""),
normalizeHost(String(record.targetName ?? "")),
String(record.svcParams ?? ""),
String(record.port ?? ""),
String(record.scheme ?? ""),
].join(":");
case "MX":
return `${Number(record.preference ?? -1)}:${normalizeHost(String(record.exchange ?? ""))}`;
case "NS":
return normalizeHost(String(record.nameserver ?? ""));
case "PTR":
return normalizeHost(String(record.pointer ?? ""));
case "SRV":
return [
String(record.service ?? ""),
String(record.protocol ?? ""),
String(record.priority ?? ""),
String(record.weight ?? ""),
String(record.port ?? ""),
normalizeHost(String(record.target ?? "")),
].join(":");
case "TLSA":
return [
String(record.port ?? ""),
String(record.protocol ?? ""),
String(record.usage ?? ""),
String(record.selector ?? ""),
String(record.matching ?? ""),
String(record.associationData ?? "").toLowerCase().replace(/\s/g, ""),
].join(":");
case "TXT":
return String(record.value ?? "");
default:
return "";
}
};
export const recordFingerprint = (record: DnsRecord, includeTtl: boolean): string => {
const type = record.type.toUpperCase();
const name = normalizeName(record.name);
const value = recordComparableValue(record);
const ttl = includeTtl ? String(record.ttl ?? "") : "";
return `${type}|${name}|${value}|${ttl}`;
};
export const extractComparableFields = (record: DnsRecord): Record<string, unknown> => {
const type = record.type.toUpperCase();
const common = { type, name: record.name, ttl: record.ttl };
switch (type) {
case "A":
case "AAAA":
return { ...common, address: record.address };
case "ALIAS":
return { ...common, aliasName: record.aliasName };
case "CAA":
return { ...common, flag: record.flag, tag: record.tag, value: record.value };
case "CNAME":
return { ...common, cname: record.cname };
case "HTTPS":
case "SVCB":
return {
...common,
svcPriority: record.svcPriority,
targetName: record.targetName,
svcParams: record.svcParams,
port: record.port,
scheme: record.scheme,
};
case "MX":
return { ...common, exchange: record.exchange, preference: record.preference };
case "NS":
return { ...common, nameserver: record.nameserver };
case "PTR":
return { ...common, pointer: record.pointer };
case "SRV":
return {
...common,
service: record.service,
protocol: record.protocol,
priority: record.priority,
weight: record.weight,
port: record.port,
target: record.target,
};
case "TLSA":
return {
...common,
port: record.port,
protocol: record.protocol,
usage: record.usage,
selector: record.selector,
matching: record.matching,
associationData: record.associationData,
scheme: record.scheme,
};
case "TXT":
return { ...common, value: record.value };
default:
return { ...common };
}
};
export const summarizeByType = (records: DnsRecord[]): Record<string, number> => {
const counts: Record<string, number> = {};
for (const record of records) {
const key = record.type.toUpperCase();
counts[key] = (counts[key] ?? 0) + 1;
}
return counts;
};
const KnownVercelIpv4 = new Set(["76.76.21.21"]);
export const isLikelyVercelRecord = (record: DnsRecord): boolean => {
const type = record.type.toUpperCase();
if (type === "A" && typeof record.address === "string") {
if (KnownVercelIpv4.has(record.address)) return true;
if (record.address.startsWith("216.198.79.")) return true;
}
const hostFields = [record.cname, record.exchange, record.target, record.value]
.filter((v): v is string => typeof v === "string")
.join(" ")
.toLowerCase();
return hostFields.includes("vercel");
};
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