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Web relay websocket ping/pong forwarding, #4172

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Ylian Saint-Hilaire 2022-06-28 15:42:52 -07:00
parent 0637412d1b
commit a383bd1cb3
1 changed files with 43 additions and 59 deletions
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102
apprelays.js
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@ -260,42 +260,48 @@ module.exports.CreateWebRelay = function (parent, db, args, domain) {
// Setup opcode and payload
var op = 2, payload = data;
if (typeof data == 'string') { op = 1; payload = Buffer.from(data, 'binary'); } // Text frame
// Select a random mask
const mask = parent.parent.crypto.randomBytes(4)
// Setup header and mask
var header = null;
if (data.length < 126) {
header = Buffer.alloc(6); // Header (2) + Mask (4)
header[0] = 0x80 + op; // FIN + OP
header[1] = 0x80 + data.length; // Mask + Length
mask.copy(header, 2, 0, 4); // Copy the mask
} else if (data.length <= 0xFFFF) {
header = Buffer.alloc(8); // Header (2) + Length (2) + Mask (4)
header[0] = 0x80 + op; // FIN + OP
header[1] = 0x80 + 126; // Mask + 126
header.writeInt16BE(data.length, 2); // Payload size
mask.copy(header, 4, 0, 4); // Copy the mask
} else {
header = Buffer.alloc(14); // Header (2) + Length (8) + Mask (4)
header[0] = 0x80 + op; // FIN + OP
header[1] = 0x80 + 127; // Mask + 127
header.writeInt32BE(data.length, 6); // Payload size
mask.copy(header, 10, 0, 4); // Copy the mask
}
// Mask the payload
for (var i = 0; i < payload.length; i++) { payload[i] = (payload[i] ^ mask[i % 4]); }
// Send the frame
//console.log(obj.tunnelId, '-->', op, payload.length);
send(Buffer.concat([header, payload]));
sendWebSocketFrameToDevice(op, payload);
});
obj.ws.on('ping', function (data) { sendWebSocketFrameToDevice(9, data); }); // Forward ping frame
obj.ws.on('pong', function (data) { sendWebSocketFrameToDevice(10, data); }); // Forward pong frame
obj.ws.on('close', function () { obj.close(); });
obj.ws.on('error', function (err) { obj.close(); });
}
function sendWebSocketFrameToDevice(op, payload) {
// Select a random mask
const mask = parent.parent.crypto.randomBytes(4)
// Setup header and mask
var header = null;
if (payload.length < 126) {
header = Buffer.alloc(6); // Header (2) + Mask (4)
header[0] = 0x80 + op; // FIN + OP
header[1] = 0x80 + payload.length; // Mask + Length
mask.copy(header, 2, 0, 4); // Copy the mask
} else if (payload.length <= 0xFFFF) {
header = Buffer.alloc(8); // Header (2) + Length (2) + Mask (4)
header[0] = 0x80 + op; // FIN + OP
header[1] = 0x80 + 126; // Mask + 126
header.writeInt16BE(payload.length, 2); // Payload size
mask.copy(header, 4, 0, 4); // Copy the mask
} else {
header = Buffer.alloc(14); // Header (2) + Length (8) + Mask (4)
header[0] = 0x80 + op; // FIN + OP
header[1] = 0x80 + 127; // Mask + 127
header.writeInt32BE(payload.length, 6); // Payload size
mask.copy(header, 10, 0, 4); // Copy the mask
}
// Mask the payload
for (var i = 0; i < payload.length; i++) { payload[i] = (payload[i] ^ mask[i % 4]); }
// Send the frame
//console.log(obj.tunnelId, '-->', op, payload.length);
send(Buffer.concat([header, payload]));
}
// Disconnect
obj.close = function (arg) {
if (obj.closed == true) return;
@ -541,34 +547,12 @@ module.exports.CreateWebRelay = function (parent, db, args, domain) {
// Perform operation
switch (op) {
case 0: { // Continue frame
//console.log('continue', payload.length);
break;
}
case 1: { // Text frame
//console.log('text', payload.length);
try { obj.ws.send(payload.toString('binary')); } catch (ex) { }
break;
}
case 2: { // Binary frame
//console.log('binary', payload.length);
try { obj.ws.send(payload); } catch (ex) { }
break;
}
case 8: { // Connection close
obj.close();
return;
}
case 9: { // Ping frame
//console.log('ping', payload.length);
// TODO
break;
}
case 10: { // Pong frame
//console.log('pong', payload.length);
// TODO
break;
}
case 0: { break; } // Continue frame (TODO)
case 1: { try { obj.ws.send(payload.toString('binary')); } catch (ex) { } break; } // Text frame
case 2: { try { obj.ws.send(payload); } catch (ex) { } break; } // Binary frame
case 8: { obj.close(); return; } // Connection close
case 9: { try { obj.ws.ping(payload); } catch (ex) { } break; } // Ping frame
case 10: { try { obj.ws.pong(payload); } catch (ex) { } break; } // Pong frame
}
}
}