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MrUnknownDE
2025-03-29 11:26:48 +01:00
parent 7eac8b00ae
commit b001ca6d29
6 changed files with 1126 additions and 0 deletions
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# .env
GEOIP_CITY_DB=./data/GeoLite2-City.mmdb
GEOIP_ASN_DB=./data/GeoLite2-ASN.mmdb
PORT=3000

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19
backend/package.json Normal file
View File

@@ -0,0 +1,19 @@
{
"name": "utrools-backend",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"@maxmind/geoip2-node": "^6.0.0",
"cors": "^2.8.5",
"dotenv": "^16.4.7",
"express": "^4.21.2",
"ip-address": "^10.0.1"
}
}

258
backend/server.js Normal file
View File

@@ -0,0 +1,258 @@
// server.js
require('dotenv').config(); // Lädt Variablen aus .env in process.env
const express = require('express');
const cors = require('cors');
const geoip = require('@maxmind/geoip2-node');
const { Address4, Address6 } = require('ip-address');
const { spawn } = require('child_process');
const dns = require('dns').promises; // Für asynchrones DNS
const app = express();
const PORT = process.env.PORT || 3000;
// --- Globale Variablen für MaxMind Reader ---
let cityReader;
let asnReader;
// --- Hilfsfunktionen ---
/**
* Validiert eine IP-Adresse (v4 oder v6).
* @param {string} ip - Die zu validierende IP-Adresse.
* @returns {boolean} True, wenn gültig, sonst false.
*/
function isValidIp(ip) {
if (!ip) return false;
const addr4 = new Address4(ip);
const addr6 = new Address6(ip);
return addr4.isValid() || addr6.isValid();
}
/**
* Bereinigt eine IP-Adresse (z.B. entfernt ::ffff: Präfix von IPv4-mapped IPv6).
* @param {string} ip - Die IP-Adresse.
* @returns {string} Die bereinigte IP-Adresse.
*/
function getCleanIp(ip) {
if (ip.startsWith('::ffff:')) {
const potentialIp4 = ip.substring(7);
if (new Address4(potentialIp4).isValid()) {
return potentialIp4;
}
}
// Handle localhost cases for testing
if (ip === '::1' || ip === '127.0.0.1') {
// Optional: Return a public test IP or handle differently
// For now, just return it, MaxMind/Ping/Trace will likely fail
return ip;
}
return ip;
}
/**
* Führt einen Shell-Befehl sicher aus und gibt stdout zurück.
* @param {string} command - Der Befehl (z.B. 'ping').
* @param {string[]} args - Die Argumente als Array.
* @returns {Promise<string>} Eine Promise, die mit stdout aufgelöst wird.
*/
function executeCommand(command, args) {
return new Promise((resolve, reject) => {
// Zusätzliche Validierung der Argumente (besonders IPs)
args.forEach(arg => {
// Einfache Prüfung auf potenziell gefährliche Zeichen
// Dies ist KEIN vollständiger Schutz, aber eine zusätzliche Ebene.
// Die IP-Validierung vorher ist wichtiger!
if (/[;&|`$()<>]/.test(arg)) {
return reject(new Error(`Invalid character detected in argument: ${arg}`));
}
});
const proc = spawn(command, args);
let stdout = '';
let stderr = '';
proc.stdout.on('data', (data) => {
stdout += data.toString();
});
proc.stderr.on('data', (data) => {
stderr += data.toString();
});
proc.on('error', (err) => {
// Fehler beim Starten des Prozesses
reject(new Error(`Failed to start command ${command}: ${err.message}`));
});
proc.on('close', (code) => {
if (code !== 0) {
// Befehl wurde ausgeführt, aber mit Fehlercode beendet
reject(new Error(`Command ${command} failed with code ${code}: ${stderr || stdout}`));
} else {
resolve(stdout);
}
});
});
}
// --- Initialisierung (MaxMind DBs laden) ---
async function initialize() {
try {
console.log('Loading MaxMind databases...');
cityReader = await geoip.Reader.open(process.env.GEOIP_CITY_DB || './data/GeoLite2-City.mmdb');
asnReader = await geoip.Reader.open(process.env.GEOIP_ASN_DB || './data/GeoLite2-ASN.mmdb');
console.log('MaxMind databases loaded successfully.');
} catch (error) {
console.error('FATAL: Could not load MaxMind databases.');
console.error('Ensure GEOIP_CITY_DB and GEOIP_ASN_DB point to valid .mmdb files.');
console.error(error);
process.exit(1); // Beenden, wenn DBs nicht geladen werden können
}
}
// --- Middleware ---
app.use(cors()); // Erlaubt Anfragen von anderen Origins (z.B. dein Frontend)
app.use(express.json()); // Parst JSON-Request-Bodies (brauchen wir hier nicht direkt, aber gute Praxis)
// Vertraue dem Proxy-Header für die IP (wenn hinter einem Reverse Proxy wie Nginx)
// Vorsicht: Nur aktivieren, wenn du WIRKLICH hinter einem vertrauenswürdigen Proxy bist!
// app.set('trust proxy', true);
// --- Routen ---
// Haupt-Endpunkt: Liefert alle Infos zur IP des Clients
app.get('/api/ipinfo', async (req, res) => {
// WICHTIG: 'req.ip' hängt von 'trust proxy' ab.
// Sicherer ist oft, den spezifischen Header zu prüfen, den dein Proxy setzt (z.B. 'X-Forwarded-For')
// Beispiel: const clientIpRaw = req.headers['x-forwarded-for']?.split(',')[0].trim() || req.socket.remoteAddress;
const clientIpRaw = req.ip || req.socket.remoteAddress;
const clientIp = getCleanIp(clientIpRaw);
if (!isValidIp(clientIp)) {
return res.status(400).json({ error: 'Could not determine a valid client IP address.', rawIp: clientIpRaw });
}
try {
let geo = null;
try {
const geoData = cityReader.city(clientIp);
geo = {
city: geoData.city?.names?.en,
region: geoData.subdivisions?.[0]?.isoCode,
country: geoData.country?.isoCode,
countryName: geoData.country?.names?.en,
postalCode: geoData.postal?.code,
latitude: geoData.location?.latitude,
longitude: geoData.location?.longitude,
timezone: geoData.location?.timeZone,
};
} catch (e) { /* IP nicht in DB oder private IP */ }
let asn = null;
try {
const asnData = asnReader.asn(clientIp);
asn = {
number: asnData.autonomousSystemNumber,
organization: asnData.autonomousSystemOrganization,
};
} catch (e) { /* IP nicht in DB oder private IP */ }
let rdns = null;
try {
// Reverse DNS Lookup kann etwas dauern
const hostnames = await dns.reverse(clientIp);
rdns = hostnames; // Ist ein Array von Hostnamen
} catch (e) {
// Fehler wie NXDOMAIN (No Such Domain) sind normal, ignorieren
if (e.code !== 'ENOTFOUND' && e.code !== 'ENODATA') {
console.warn(`rDNS lookup error for ${clientIp}:`, e.message);
}
}
res.json({
ip: clientIp,
geo,
asn,
rdns,
});
} catch (error) {
console.error(`Error processing ipinfo for ${clientIp}:`, error);
res.status(500).json({ error: 'Internal server error while processing IP information.' });
}
});
// Ping Endpunkt
app.get('/api/ping', async (req, res) => {
const targetIp = req.query.targetIp;
if (!isValidIp(targetIp)) {
return res.status(400).json({ error: 'Invalid target IP address provided.' });
}
// Sicherstellen, dass es sich nicht um eine private/interne IP handelt? Optional.
// const addr = new Address6(targetIp);
// if (addr.isInSubnet('10.0.0.0/8') || ... ) {
// return res.status(403).json({ error: 'Pinging private IPs is not allowed.' });
// }
try {
// Parameter anpassen (z.B. -c für Linux/macOS, -n für Windows)
// Hier für Linux/macOS: 4 Pings senden
const args = ['-c', '4', targetIp];
const command = 'ping';
console.log(`Executing: ${command} ${args.join(' ')}`);
const output = await executeCommand(command, args);
// TODO: Ping-Ausgabe parsen für strukturierte Daten (RTT min/avg/max, loss)
res.json({ success: true, rawOutput: output });
} catch (error) {
console.error(`Error executing ping for ${targetIp}:`, error);
res.status(500).json({ success: false, error: `Ping command failed: ${error.message}` });
}
});
// Traceroute Endpunkt
app.get('/api/traceroute', async (req, res) => {
const targetIp = req.query.targetIp;
if (!isValidIp(targetIp)) {
return res.status(400).json({ error: 'Invalid target IP address provided.' });
}
try {
// Parameter anpassen. '-n' verhindert rDNS durch traceroute selbst (schneller).
// Evtl. Timeouts anpassen (-w), max Hops (-m)
const args = ['-n', targetIp]; // Für Linux/macOS
// Für Windows wäre es: const args = ['-d', targetIp]; const command = 'tracert';
const command = 'traceroute';
console.log(`Executing: ${command} ${args.join(' ')}`);
const output = await executeCommand(command, args);
// TODO: Traceroute-Ausgabe parsen für strukturierte Daten (Array von Hops)
res.json({ success: true, rawOutput: output });
} catch (error) {
console.error(`Error executing traceroute for ${targetIp}:`, error);
res.status(500).json({ success: false, error: `Traceroute command failed: ${error.message}` });
}
});
// --- Server starten ---
initialize().then(() => {
app.listen(PORT, () => {
console.log(`Server listening on port ${PORT}`);
console.log(`API endpoints available at:`);
console.log(` http://localhost:${PORT}/api/ipinfo`);
console.log(` http://localhost:${PORT}/api/ping?targetIp=<ip>`);
console.log(` http://localhost:${PORT}/api/traceroute?targetIp=<ip>`);
});
}).catch(error => {
// Fehler bei der Initialisierung wurde bereits geloggt.
console.error("Server could not start due to initialization errors.");
});