/**
* Called whenever there is data available on the stream
* @param $data String the raw data
*/
public function onData($data)
{
//if we're in encryption stage decrypt it first
if ($this->secret !== null) {
mcrypt_generic_init($this->encryptor, $this->secret, $this->secret);
$data = mdecrypt_generic($this->encryptor, $data);
mcrypt_generic_deinit($this->encryptor);
}
//attempt to parse the data as a packet
try {
//add the data to the current buffer
$this->packetBuffer .= $data;
//for as long as we have data left in the buffer
do {
//read the packet length from the stream
$packetLengthVarInt = VarInt::readUnsignedVarInt($this->packetBuffer);
//not enough data to read the packet length, wait for more data
if ($packetLengthVarInt === false) {
return;
}
//total length of the packet is the length of the varint + it's value
$totalLength = $packetLengthVarInt->getDataLength() + $packetLengthVarInt->getValue();
//if we don't have enough data to read the entire packet wait for more data to enter
$bufferLength = strlen($this->packetBuffer);
if ($bufferLength < $totalLength) {
return;
}
//remove the packet length varint from the buffer
$this->packetBuffer = substr($this->packetBuffer, $packetLengthVarInt->getDataLength());
//read the packet ID from the buffer
$packetDataWithPacketID = substr($this->packetBuffer, 0, $packetLengthVarInt->getValue());
//remove the rest of the packet from the buffer
$this->packetBuffer = substr($this->packetBuffer, $packetLengthVarInt->getValue());
//read the packet ID
$packetID = VarInt::readUnsignedVarInt($packetDataWithPacketID);
//get the raw packet data
$packetData = substr($packetDataWithPacketID, $packetID->getDataLength());
$this->lastPacket = $this->currentTime();
//trigger packet processing
$this->processPacket($packetID->getValue(), $packetData);
//if we have buffer left run again
} while (strlen($this->packetBuffer) > 0);
//if any exceptions are thrown (error parsing the packets e.t.c.) send a disconnect packet
} catch (Exception $ex) {
echo "EXCEPTION IN PACKET PARSING {$ex->getMessage()}\n";
echo $ex->getTraceAsString();
$dis = new DisconnectPacket();
$dis->setReason('Internal Server Error: ' . $ex->getMessage());
$this->end($dis->encodePacket());
}
}
/**
* Called on event LOGIN.EncryptionResponsePacket
* @param EncryptionResponsePacket $packet
*/
public function onEncryptionResponsePacket(EncryptionResponsePacket $packet)
{
//if we don't have a verifiyToken sent yet then the packet has been sent without us sending a request, disconnect client
if (null === $this->verifyToken) {
$this->disconnectClient((new DisconnectPacket())->setReason('Packet received out of order'));
return;
}
//get the verify token from the packet it and decrypt it using our key
$verifyToken = $this->certificate->getPrivateKey()->decrypt($packet->getToken());
//if it isn't the same as our token then encryption failed, disconnect the client
if ($verifyToken != $this->verifyToken) {
$this->disconnectClient((new DisconnectPacket())->setReason('Invalid validation token'));
return;
}
//decrypt the shared secret from the packet and decrypt it using our key
$secret = $this->certificate->getPrivateKey()->decrypt($packet->getSecret());
//enable encryption using the client generated secret
$this->enableAES($secret);
//generate a login hash the same as the client for the session server request
$publicKey = $this->certificate->getPublicKey()->getPublicKey();
$publicKey = base64_decode(substr($publicKey, 28, -26));
//cut out the start and end lines of the key
$loginHash = $this->serverID . $secret . $publicKey;
$loginHash = self::sha1($loginHash);
//create a new Yggdrasil for checking against Mojang
$yggdrasil = new DefaultYggdrasil();
try {
//ask Mojang if the user has sent a join request, throws exception on failure
$response = $yggdrasil->hasJoined($this->username, $loginHash);
//get and set the clients UUID from the response
$this->uuid = $response->getUuid();
//trigger the login success with the disconnect packet
$disconnect = new DisconnectPacket();
$this->emit('login_success', [$this, $disconnect]);
//if no reason was set after the event then set a default
if ($disconnect->getReasonJSON() === null) {
$disconnect->setReason("No kick reason supplied");
}
//disconnect the client
$this->disconnectClient($disconnect);
} catch (Exception $ex) {
echo "{$this->username} failed authentication with Mojang session servers\n";
//exception occured checking against Mojang
$this->disconnectClient((new DisconnectPacket())->setReason("Error Authenticating with Mojang servers"));
}
}
