first commit

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules
+jspm_packages
+
+# Optional npm cache directory
+.npm
+
+# Optional REPL history
+.node_repl_history
+
+# 0x
+profile-*
+
+# mac files
+.DS_Store
+
+# vim swap files
+*.swp
+
+# webstorm
+.idea
+
+# vscode
+.vscode
+*code-workspace
+
+# clinic
+profile*
+*clinic*
+*flamegraph*

dns-records.js

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+export const records = {
+  'my-pc.local': '192.168.1.100',
+  'nas.local': '192.168.1.101',
+  'dev.server.local': '127.0.0.1',
+  'test.com': '1.2.3.4',
+}; 

index.js

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+import dgram from 'dgram';
+import dnsPacket from 'dns-packet';
+import { records } from './dns-records.js';
+
+const server = dgram.createSocket('udp4');
+const PORT = 53;
+
+server.on('error', (err) => {
+  console.error(`服务器异常：\n${err.stack}`);
+  server.close();
+});
+
+server.on('message', (msg, rinfo) => {
+  console.log(`收到来自 ${rinfo.address}:${rinfo.port} 的DNS查询`);
+
+  const request = dnsPacket.decode(msg);
+  // 确保至少有一个问题
+  if (!request.questions || request.questions.length === 0) {
+    return;
+  }
+  const question = request.questions[0];
+
+  console.log(`查询的域名: ${question.name}, 类型: ${question.type}`);
+
+  // 只处理 A 记录查询 (IPv4)
+  if (question.type !== 'A') {
+    // 对于非A记录查询，可以不响应或发送适当的错误
+    return;
+  }
+
+  const domain = question.name;
+  const ip = records[domain];
+
+  let response;
+
+  if (ip) {
+    console.log(`为 ${domain} 找到IP: ${ip}`);
+    response = dnsPacket.encode({
+      type: 'response',
+      id: request.id,
+      flags: dnsPacket.AUTHORITATIVE_ANSWER,
+      questions: request.questions,
+      answers: [{
+        type: 'A',
+        class: 'IN',
+        name: domain,
+        ttl: 300, // Time-to-live
+        data: ip,
+      }],
+    });
+  } else {
+    console.log(`未找到域名 ${domain} 的记录`);
+    response = dnsPacket.encode({
+      type: 'response',
+      id: request.id,
+      flags: dnsPacket.AUTHORITATIVE_ANSWER | dnsPacket.RECURSION_AVAILABLE,
+      questions: request.questions,
+      rcode: 'NXDOMAIN' // Non-Existent Domain
+    });
+  }
+
+  server.send(response, rinfo.port, rinfo.address, (err) => {
+    if (err) {
+      console.error('发送响应失败:', err);
+    } else {
+      console.log(`已向 ${rinfo.address}:${rinfo.port} 发送响应`);
+    }
+  });
+});
+
+server.on('listening', () => {
+  const address = server.address();
+  console.log(`DNS 服务器正在监听 ${address.address}:${address.port}`);
+});
+
+server.bind(PORT, () => {
+  // 在 Windows 上，可能需要管理员权限才能绑定到 53 端口
+  if (process.platform === 'win32') {
+    console.log('在 Windows 上运行，请确保您有管理员权限来绑定到53端口。');
+  }
+}); 

package-lock.json

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+{
+  "name": "custom-dns",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "custom-dns",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "dns-packet": "^5.6.1"
+      }
+    },
+    "node_modules/@leichtgewicht/ip-codec": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/@leichtgewicht/ip-codec/-/ip-codec-2.0.5.tgz",
+      "integrity": "sha512-Vo+PSpZG2/fmgmiNzYK9qWRh8h/CHrwD0mo1h1DzL4yzHNSfWYujGTYsWGreD000gcgmZ7K4Ys6Tx9TxtsKdDw==",
+      "license": "MIT"
+    },
+    "node_modules/dns-packet": {
+      "version": "5.6.1",
+      "resolved": "https://registry.npmjs.org/dns-packet/-/dns-packet-5.6.1.tgz",
+      "integrity": "sha512-l4gcSouhcgIKRvyy99RNVOgxXiicE+2jZoNmaNmZ6JXiGajBOJAesk1OBlJuM5k2c+eudGdLxDqXuPCKIj6kpw==",
+      "license": "MIT",
+      "dependencies": {
+        "@leichtgewicht/ip-codec": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    }
+  }
+}

package.json

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+{
+  "name": "custom-dns",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "start": "node index.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "dns-packet": "^5.6.1"
+  }
+}