dnsweeper
Version:
Advanced CLI tool for DNS record risk analysis and cleanup. Features CSV import for Cloudflare/Route53, automated risk assessment, and parallel DNS validation.
215 lines • 7.26 kB
JavaScript
/**
* IPv6アドレス正規化ユーティリティ
*/
/**
* IPv6アドレスを正規化する
* - ゼロ圧縮を適用
* - 小文字に統一
* - 不要な先頭ゼロを削除
*/
export function normalizeIPv6(address) {
// 基本的な検証
if (!isValidIPv6(address)) {
throw new Error(`Invalid IPv6 address: ${address}`);
}
// IPv4射影アドレスの処理
const ipv4Match = address.match(/::ffff:(\d+\.\d+\.\d+\.\d+)/i);
if (ipv4Match) {
return `::ffff:${ipv4Match[1]}`;
}
// 省略形を展開
const expanded = expandIPv6(address);
// 正規化（最長のゼロ連続を圧縮）
const normalized = compressIPv6(expanded);
return normalized.toLowerCase();
}
/**
* IPv6アドレスを展開形式に変換
*/
export function expandIPv6(address) {
let addr = address.toLowerCase();
// :: を処理
if (addr.includes('::')) {
const parts = addr.split('::');
const left = parts[0] ? parts[0].split(':') : [];
const right = parts[1] ? parts[1].split(':') : [];
const missing = 8 - left.length - right.length;
const middle = Array(missing).fill('0000');
const allParts = [...left, ...middle, ...right];
addr = allParts.join(':');
}
// 各セグメントを4桁に補完
return addr
.split(':')
.map((part) => part.padStart(4, '0'))
.join(':');
}
/**
* IPv6アドレスを圧縮形式に変換
*/
export function compressIPv6(address) {
const addr = address.toLowerCase();
const parts = addr.split(':');
// 各パートから先頭のゼロを削除
const trimmed = parts.map((part) => part.replace(/^0+/, '') || '0');
// 最長のゼロ連続を見つける
let maxZeroStart = -1;
let maxZeroLength = 0;
let currentZeroStart = -1;
let currentZeroLength = 0;
for (let i = 0; i < trimmed.length; i++) {
if (trimmed[i] === '0') {
if (currentZeroStart === -1) {
currentZeroStart = i;
currentZeroLength = 1;
}
else {
currentZeroLength++;
}
if (currentZeroLength > maxZeroLength) {
maxZeroStart = currentZeroStart;
maxZeroLength = currentZeroLength;
}
}
else {
currentZeroStart = -1;
currentZeroLength = 0;
}
}
// 2つ以上の連続するゼロがある場合のみ圧縮
if (maxZeroLength >= 2) {
const before = trimmed.slice(0, maxZeroStart);
const after = trimmed.slice(maxZeroStart + maxZeroLength);
if (before.length === 0 && after.length === 0) {
return '::';
}
else if (before.length === 0) {
return '::' + after.join(':');
}
else if (after.length === 0) {
return before.join(':') + '::';
}
else {
return before.join(':') + '::' + after.join(':');
}
}
return trimmed.join(':');
}
/**
* IPv6アドレスの妥当性を検証
*/
export function isValidIPv6(address) {
// 基本的なパターンチェック
const ipv6Pattern = /^(([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$/;
if (!ipv6Pattern.test(address)) {
return false;
}
// :: が複数回出現しないかチェック
const doubleColonCount = (address.match(/::/g) || []).length;
if (doubleColonCount > 1) {
return false;
}
// 各セグメントが4桁以下かチェック
const segments = address.split(/::?/);
for (const segment of segments) {
if (segment.length > 4) {
return false;
}
}
return true;
}
/**
* 2つのIPv6アドレスが同じかどうかを比較
*/
export function compareIPv6(addr1, addr2) {
try {
const normalized1 = normalizeIPv6(addr1);
const normalized2 = normalizeIPv6(addr2);
return normalized1 === normalized2;
}
catch {
return false;
}
}
/**
* IPv6アドレスがリンクローカルアドレスかどうかを判定
*/
export function isLinkLocalIPv6(address) {
const expanded = expandIPv6(address);
return expanded.startsWith('fe80:');
}
/**
* IPv6アドレスがユニークローカルアドレスかどうかを判定
*/
export function isUniqueLocalIPv6(address) {
const expanded = expandIPv6(address);
return expanded.startsWith('fc') || expanded.startsWith('fd');
}
/**
* IPv6アドレスがマルチキャストアドレスかどうかを判定
*/
export function isMulticastIPv6(address) {
const expanded = expandIPv6(address);
return expanded.startsWith('ff');
}
/**
* IPv6アドレスからプレフィックスを抽出
*/
export function extractIPv6Prefix(address, prefixLength) {
if (prefixLength < 0 || prefixLength > 128) {
throw new Error(`Invalid prefix length: ${prefixLength}`);
}
const expanded = expandIPv6(address);
const parts = expanded.split(':');
const bitsPerPart = 16;
const fullParts = Math.floor(prefixLength / bitsPerPart);
const remainingBits = prefixLength % bitsPerPart;
const prefixParts = [];
// 完全なパートをコピー
for (let i = 0; i < fullParts; i++) {
const part = parts[i];
if (part !== undefined) {
prefixParts.push(part);
}
}
// 部分的なパートを処理
if (remainingBits > 0 && fullParts < 8) {
const partStr = parts[fullParts];
if (!partStr) {
return address; // パートが存在しない場合は元のアドレスを返す
}
const partValue = parseInt(partStr, 16);
const mask = (0xffff << (16 - remainingBits)) & 0xffff;
const maskedValue = partValue & mask;
prefixParts.push(maskedValue.toString(16).padStart(4, '0'));
}
// 残りをゼロで埋める
while (prefixParts.length < 8) {
prefixParts.push('0000');
}
const prefixAddress = prefixParts.join(':');
return compressIPv6(prefixAddress);
}
/**
* IPv6アドレスのスコープを取得
*/
export function getIPv6Scope(address) {
const normalized = normalizeIPv6(address);
if (normalized === '::1') {
return 'loopback';
}
if (normalized === '::') {
return 'unspecified';
}
if (isLinkLocalIPv6(address)) {
return 'link-local';
}
if (isUniqueLocalIPv6(address)) {
return 'unique-local';
}
if (isMulticastIPv6(address)) {
return 'multicast';
}
return 'global';
}
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