@push.rocks/smartproxy
Version:
A powerful proxy package with unified route-based configuration for high traffic management. Features include SSL/TLS support, flexible routing patterns, WebSocket handling, advanced security options, and automatic ACME certificate management.
288 lines • 24.5 kB
JavaScript
import * as plugins from '../../plugins.js';
import { logger } from '../../core/utils/logger.js';
/**
* Unix domain socket server that receives relayed connections from the Rust proxy.
*
* When Rust encounters a route of type `socket-handler`, it connects to this
* Unix socket, sends a JSON metadata line, then proxies the raw TCP bytes.
* This server reads the metadata, finds the original JS handler, builds an
* IRouteContext, and hands the socket to the handler.
*/
export class SocketHandlerServer {
server = null;
socketPath;
preprocessor;
activeSockets = new Set();
constructor(preprocessor) {
this.preprocessor = preprocessor;
this.socketPath = `/tmp/smartproxy-relay-${process.pid}.sock`;
}
/**
* The Unix socket path this server listens on.
*/
getSocketPath() {
return this.socketPath;
}
/**
* Start listening for relayed connections from Rust.
*/
async start() {
// Clean up stale socket file
try {
await plugins.fs.promises.unlink(this.socketPath);
}
catch {
// Ignore if doesn't exist
}
return new Promise((resolve, reject) => {
this.server = plugins.net.createServer((socket) => {
this.activeSockets.add(socket);
socket.on('close', () => this.activeSockets.delete(socket));
this.handleConnection(socket);
});
this.server.on('error', (err) => {
logger.log('error', `SocketHandlerServer error: ${err.message}`, { component: 'socket-handler-server' });
});
this.server.listen(this.socketPath, () => {
logger.log('info', `SocketHandlerServer listening on ${this.socketPath}`, { component: 'socket-handler-server' });
resolve();
});
this.server.on('error', reject);
});
}
/**
* Stop the server and clean up.
*/
async stop() {
// Destroy all active connections first
for (const socket of this.activeSockets) {
socket.destroy();
}
this.activeSockets.clear();
if (this.server) {
return new Promise((resolve) => {
this.server.close(() => {
this.server = null;
// Clean up socket file
plugins.fs.unlink(this.socketPath, () => resolve());
});
});
}
}
/**
* Handle an incoming relayed connection from Rust.
*
* Protocol: Rust sends a single JSON line with metadata, then raw bytes follow.
* JSON format: { "routeKey": "my-route", "remoteIP": "1.2.3.4", "remotePort": 12345,
* "localPort": 443, "isTLS": true, "domain": "example.com" }
*/
handleConnection(socket) {
let metadataBuffer = Buffer.alloc(0);
let metadataParsed = false;
// 10s timeout for metadata parsing phase — if Rust connects but never
// sends the JSON metadata line, don't hold the socket open indefinitely.
socket.setTimeout(10_000);
socket.on('timeout', () => {
if (!metadataParsed) {
logger.log('warn', 'Socket handler metadata timeout, closing', { component: 'socket-handler-server' });
socket.destroy();
}
});
const onData = (chunk) => {
if (metadataParsed)
return;
metadataBuffer = metadataBuffer.length === 0
? chunk
: Buffer.concat([metadataBuffer, chunk], metadataBuffer.length + chunk.length);
const newlineIndex = metadataBuffer.indexOf(0x0a);
if (newlineIndex === -1) {
// Haven't received full metadata line yet
if (metadataBuffer.length > 8192) {
logger.log('error', 'Socket handler metadata too large, closing', { component: 'socket-handler-server' });
socket.destroy();
}
return;
}
metadataParsed = true;
socket.setTimeout(0); // Clear metadata timeout
socket.removeListener('data', onData);
socket.pause(); // Prevent data loss between handler removal and pipe setup
const metadataJson = metadataBuffer.subarray(0, newlineIndex).toString('utf8');
const remainingData = metadataBuffer.subarray(newlineIndex + 1);
let metadata;
try {
metadata = JSON.parse(metadataJson);
}
catch {
logger.log('error', `Invalid socket handler metadata JSON: ${metadataJson.slice(0, 200)}`, { component: 'socket-handler-server' });
socket.destroy();
return;
}
this.dispatchToHandler(socket, metadata, remainingData);
};
socket.on('data', onData);
socket.on('error', (err) => {
logger.log('error', `Socket handler relay error: ${err.message}`, { component: 'socket-handler-server' });
});
}
/**
* Dispatch a relayed connection to the appropriate JS handler.
*/
dispatchToHandler(socket, metadata, remainingData) {
const routeKey = metadata.routeKey;
if (!routeKey) {
logger.log('error', 'Socket handler relay missing routeKey', { component: 'socket-handler-server' });
socket.destroy();
return;
}
const originalRoute = this.preprocessor.getOriginalRoute(routeKey);
if (!originalRoute) {
logger.log('error', `No handler found for route: ${routeKey}`, { component: 'socket-handler-server' });
socket.destroy();
return;
}
// Build route context
const context = {
port: metadata.localPort || 0,
domain: metadata.domain,
clientIp: metadata.remoteIP || 'unknown',
serverIp: '0.0.0.0',
vpn: metadata.vpn,
path: metadata.path,
isTls: metadata.isTLS || false,
tlsVersion: metadata.tlsVersion,
routeName: originalRoute.name,
routeId: originalRoute.id,
timestamp: Date.now(),
connectionId: metadata.connectionId || `relay-${Date.now()}`,
};
// If there was remaining data after the metadata line, push it back
if (remainingData.length > 0) {
socket.unshift(remainingData);
}
const handler = originalRoute.action.socketHandler;
if (handler) {
// Route has an explicit socket handler callback
try {
const result = handler(socket, context);
// If the handler is async, wait for it to finish setup before resuming.
// This prevents data loss when async handlers need to do work before
// attaching their `data` listeners.
if (result && typeof result.then === 'function') {
result.then(() => {
socket.resume();
}).catch((err) => {
logger.log('error', `Async socket handler rejected for route ${routeKey}: ${err.message}`, { component: 'socket-handler-server' });
socket.destroy();
});
}
else {
// Synchronous handler — listeners are already attached, safe to resume.
socket.resume();
}
}
catch (err) {
logger.log('error', `Socket handler threw for route ${routeKey}: ${err.message}`, { component: 'socket-handler-server' });
socket.destroy();
}
return;
}
// Route has dynamic host/port functions - resolve and forward
if (originalRoute.action.targets && originalRoute.action.targets.length > 0) {
this.forwardDynamicRoute(socket, originalRoute, context);
return;
}
logger.log('error', `Route ${routeKey} has no socketHandler and no targets`, { component: 'socket-handler-server' });
socket.destroy();
}
/**
* Forward a connection to a dynamically resolved target.
* Used for routes with function-based host/port that Rust cannot handle.
*/
forwardDynamicRoute(socket, route, context) {
const targets = route.action.targets;
// Pick a target (round-robin would be ideal, but simple random for now)
const target = targets[Math.floor(Math.random() * targets.length)];
// Resolve host
let host;
if (typeof target.host === 'function') {
try {
const result = target.host(context);
host = Array.isArray(result) ? result[Math.floor(Math.random() * result.length)] : result;
}
catch (err) {
logger.log('error', `Dynamic host function failed: ${err.message}`, { component: 'socket-handler-server' });
socket.destroy();
return;
}
}
else if (typeof target.host === 'string') {
host = target.host;
}
else if (Array.isArray(target.host)) {
host = target.host[Math.floor(Math.random() * target.host.length)];
}
else {
host = 'localhost';
}
// Resolve port
let port;
if (typeof target.port === 'function') {
try {
port = target.port(context);
}
catch (err) {
logger.log('error', `Dynamic port function failed: ${err.message}`, { component: 'socket-handler-server' });
socket.destroy();
return;
}
}
else if (typeof target.port === 'number') {
port = target.port;
}
else {
port = context.port;
}
logger.log('debug', `Dynamic forward: ${context.clientIp} -> ${host}:${port}`, { component: 'socket-handler-server' });
// Connect to the resolved target
const backend = plugins.net.connect(port, host, () => {
// Connection established — set idle timeout on both sides (5 min)
socket.setTimeout(300_000);
backend.setTimeout(300_000);
// Pipe bidirectionally
socket.pipe(backend);
backend.pipe(socket);
});
// Track backend socket for cleanup on stop()
this.activeSockets.add(backend);
backend.on('close', () => {
this.activeSockets.delete(backend);
});
// Connect timeout: if backend doesn't connect within 30s, destroy both
backend.setTimeout(30_000);
backend.on('timeout', () => {
logger.log('warn', `Dynamic forward timeout to ${host}:${port}`, { component: 'socket-handler-server' });
backend.destroy();
socket.destroy();
});
socket.on('timeout', () => {
logger.log('debug', `Dynamic forward client idle timeout`, { component: 'socket-handler-server' });
socket.destroy();
backend.destroy();
});
backend.on('error', (err) => {
logger.log('error', `Dynamic forward backend error: ${err.message}`, { component: 'socket-handler-server' });
socket.destroy();
});
socket.on('error', () => {
backend.destroy();
});
socket.on('close', () => {
backend.destroy();
});
backend.on('close', () => {
socket.destroy();
});
}
}
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