/// <summary>
/// PASV Command - RFC 959 - Section 4.1.2
/// <para>进入被动模式（请求服务器等待数据连接）</para>
/// </summary>
/// <returns></returns>
private Response Passive()
{
_dataConnectionType = DataConnectionType.Passive;
IPAddress localIp = ((IPEndPoint)ControlClient.Client.LocalEndPoint).Address;
_passiveListener = PassiveListenerPool.GetListener(localIp);
try
{
_passiveListener.Start();
}
catch
{
_log.Error("No more ports available");
return(GetResponse(FtpResponses.UNABLE_TO_OPEN_DATA_CONNECTION));
}
IPEndPoint passiveListenerEndpoint = (IPEndPoint)_passiveListener.LocalEndpoint;
byte[] address = passiveListenerEndpoint.Address.GetAddressBytes();
ushort port = (ushort)passiveListenerEndpoint.Port;
byte[] portArray = BitConverter.GetBytes(port);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(portArray);
}
return(GetResponse(FtpResponses.ENTERING_PASSIVE_MODE.SetData(address[0], address[1], address[2], address[3], portArray[0], portArray[1])));
}
/// <summary>
/// EPSV Command - RFC 2428
/// <para>扩展被动模式（IPv6）</para>
/// </summary>
/// <returns></returns>
private Response EPassive()
{
_dataConnectionType = DataConnectionType.Passive;
IPAddress localIp = ((IPEndPoint)ControlClient.Client.LocalEndPoint).Address;
_passiveListener = PassiveListenerPool.GetListener(localIp);
try
{
_passiveListener.Start();
}
catch
{
_log.Error("No more ports available");
return(GetResponse(FtpResponses.UNABLE_TO_OPEN_DATA_CONNECTION));
}
IPEndPoint passiveListenerEndpoint = (IPEndPoint)_passiveListener.LocalEndpoint;
return(GetResponse(FtpResponses.ENTERING_EXTENDED_PASSIVE_MODE.SetData(passiveListenerEndpoint.Port)));
}
