Limit client flags to server capabilities

Author: KrisBraun

lib/commands/server_handshake.js

@@ -35,7 +35,7 @@ class ServerHandshake extends Command {
 
  readClientReply(packet, connection) {
  // check auth here
- const clientHelloReply = Packets.HandshakeResponse.fromPacket(packet);
+ const clientHelloReply = Packets.HandshakeResponse.fromPacket(packet, this.args.capabilityFlags);
  // TODO check we don't have something similar already
  connection.clientHelloReply = clientHelloReply;
  if (this.args.authCallback) {

lib/packets/handshake_response.js

@@ -99,11 +99,11 @@ class HandshakeResponse {
  const p = this.serializeResponse(Packet.MockBuffer());
  return this.serializeResponse(Buffer.alloc(p.offset));
  }
- static fromPacket(packet) {
+ static fromPacket(packet, serverFlags) {
  const args = {};
  args.clientFlags = packet.readInt32();
  function isSet(flag) {
- return args.clientFlags & ClientConstants[flag];
+ return (args.clientFlags & serverFlags) & ClientConstants[flag];
  }
  args.maxPacketSize = packet.readInt32();
  args.charsetNumber = packet.readInt8();