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apps/rego-tunnel/vpn_scripts - not used/socks5.js

@@ -0,0 +1,69 @@
+const net = require('net');
+
+const PORT = 1080;
+const HOST = '0.0.0.0';
+
+const server = net.createServer((client) => {
+  client.once('data', (data) => {
+    // SOCKS5 handshake
+    if (data[0] !== 0x05) {
+      client.end();
+      return;
+    }
+
+    // No auth required
+    client.write(Buffer.from([0x05, 0x00]));
+
+    client.once('data', (data) => {
+      if (data[0] !== 0x05 || data[1] !== 0x01) {
+        client.write(Buffer.from([0x05, 0x07, 0x00, 0x01, 0, 0, 0, 0, 0, 0]));
+        client.end();
+        return;
+      }
+
+      let host, port;
+      const atyp = data[3];
+
+      if (atyp === 0x01) {
+        // IPv4
+        host = `${data[4]}.${data[5]}.${data[6]}.${data[7]}`;
+        port = data.readUInt16BE(8);
+      } else if (atyp === 0x03) {
+        // Domain
+        const len = data[4];
+        host = data.slice(5, 5 + len).toString();
+        port = data.readUInt16BE(5 + len);
+      } else if (atyp === 0x04) {
+        // IPv6
+        host = '';
+        for (let i = 0; i < 16; i += 2) {
+          host += data.slice(4 + i, 6 + i).toString('hex');
+          if (i < 14) host += ':';
+        }
+        port = data.readUInt16BE(20);
+      } else {
+        client.write(Buffer.from([0x05, 0x08, 0x00, 0x01, 0, 0, 0, 0, 0, 0]));
+        client.end();
+        return;
+      }
+
+      const remote = net.createConnection(port, host, () => {
+        const response = Buffer.from([0x05, 0x00, 0x00, 0x01, 0, 0, 0, 0, 0, 0]);
+        client.write(response);
+        client.pipe(remote);
+        remote.pipe(client);
+      });
+
+      remote.on('error', () => {
+        client.write(Buffer.from([0x05, 0x05, 0x00, 0x01, 0, 0, 0, 0, 0, 0]));
+        client.end();
+      });
+    });
+  });
+
+  client.on('error', () => {});
+});
+
+server.listen(PORT, HOST, () => {
+  console.log(`SOCKS5 proxy running on ${HOST}:${PORT}`);
+});