};
// 当shadowsocks客户端连接上有错误时，关闭远程服务端连接
$connection->onError = function ($connection, $code, $msg) {
echo "connection err code:{$code} msg:{$msg}\n";
$connection->close();
if (isset($connection->opposite)) {
$connection->opposite->close();
}
};
// 执行远程连接
$remote_connection->connect();
// 改变当前连接的状态为STAGE_STREAM，即开始转发数据流
$connection->state = STAGE_STREAM;
// shadowsocks客户端第一次发来的数据超过头部，则要把头部后面的数据发给远程服务端
if (strlen($buffer) > $header_len) {
$remote_connection->send(substr($buffer, $header_len));
}
}
};
/**
* 解析shadowsocks客户端发来的socket5头部数据
* @param string $buffer
*/
function parse_socket5_header($buffer)
{
$addr_type = ord($buffer[0]);
switch ($addr_type) {
case ADDRTYPE_IPV4:
$dest_addr = ord($buffer[1]) . '.' . ord($buffer[2]) . '.' . ord($buffer[3]) . '.' . ord($buffer[4]);
$port_data = unpack('n', substr($buffer, 5, 2));
$dest_port = $port_data[1];
// 当客户端发来数据时，加密数据，并发给远程服务端
$connection->onMessage = function ($connection, $data) {
$connection->opposite->send($connection->encryptor->encrypt($data));
};
// 当客户端关闭连接时，关闭远程服务端的连接
$connection->onClose = function ($connection) {
$connection->opposite->close();
$connection->opposite = null;
};
// 当客户端连接上有错误时，关闭远程服务端连接
$connection->onError = function ($connection, $code, $msg) {
echo "connection err code:{$code} msg:{$msg}\n";
$connection->close();
if (isset($connection->opposite)) {
$connection->opposite->close();
}
};
// 执行远程连接
$remote_connection->connect();
// 改变当前连接的状态为STAGE_STREAM，即开始转发数据流
$connection->state = STAGE_STREAM;
//转发首个数据包，包含由客户端封装的目标地址，端口号等信息
$buffer = substr($buffer, 3);
$buffer = $connection->encryptor->encrypt($buffer);
$remote_connection->send($buffer);
}
};
// 如果不是在根目录启动，则运行runAll方法
if (!defined('GLOBAL_START')) {
Worker::runAll();
}
/**
* 尝试连接Gateway内部通讯地址
* @return void
*/
public function tryToConnectGateway($addr)
{
if (!isset($this->gatewayConnections[$addr]) && !isset($this->_connectingGatewayAddresses[$addr]) && isset($this->_gatewayAddresses[$addr])) {
$gateway_connection = new AsyncTcpConnection("GatewayProtocol://{$addr}");
$gateway_connection->remoteAddress = $addr;
$gateway_connection->onConnect = array($this, 'onConnectGateway');
$gateway_connection->onMessage = array($this, 'onGatewayMessage');
$gateway_connection->onClose = array($this, 'onGatewayClose');
$gateway_connection->onError = array($this, 'onGatewayError');
if (TcpConnection::$defaultMaxSendBufferSize == $gateway_connection->maxSendBufferSize) {
$gateway_connection->maxSendBufferSize = 50 * 1024 * 1024;
}
$gateway_data = GatewayProtocol::$empty;
$gateway_data['cmd'] = GatewayProtocol::CMD_WORKER_CONNECT;
$gateway_connection->send($gateway_data);
$gateway_connection->connect();
$this->_connectingGatewayAddresses[$addr] = $addr;
}
unset($this->_waitingConnectGatewayAddresses[$addr]);
}