private async Task OpenDataConnection()
{
if (ClientDataConnection != null && ClientDataConnection.IsConnectionOpen)
{
SendResponse(new FtpReply()
{
ReplyCode = FtpReplyCode.TransferStarting, Message = "Transfer is starting."
}, false);
return;
}
SendResponse(new FtpReply()
{
ReplyCode = FtpReplyCode.AboutToOpenDataConnection, Message = "Trying to open data connection."
}, false);
switch (UserConnectionType)
{
case ConnectionType.ACTIVE:
{
ClientDataConnection.OpenActiveConnection();
break;
}
case ConnectionType.EXT_PASSIVE:
case ConnectionType.PASSIVE:
{
ClientDataConnection.OpenPassiveConnection();
break;
}
}
}
public async Task OnSendData(Stream listingStream)
{
await OpenDataConnection().ConfigureAwait(false);
await ClientDataConnection.SendBytes(listingStream);
ClientDataConnection.Disconnect();
}
public async Task OnUploadFile(string parameter)
{
await OpenDataConnection();
await ClientDataConnection.ReceiveBytes(parameter);
ClientDataConnection.Disconnect();
}
public async Task OnDataChannelEncryptionDisabled()
{
ClientDataConnection.DisableEncryption();
ActionsTracker.ConnectionSecurityChanged(null, new ConnectionSecurityChangedEventArgs()
{
EndPoint = ClientInitialRemoteEndPoint,
Security = ConnectionFlags.HasFlag(ControlConnectionFlags.UsingTLSorSSL)
? ConnectionSecurity.ControlConnectionSecured
: ConnectionSecurity.NonSecure
});
}
public void OnEnterActiveMode(string endPoint)
{
// Example of a command : PORT 127,0,0,1,203,175
var endPointBytes = endPoint.Split(',');
var portBytes = new byte[2] {
byte.Parse(endPointBytes[4]), byte.Parse(endPointBytes[5])
};
ClientDataConnection.InitializeActiveConnection(portBytes[0] * 256 + portBytes[1],
new IPEndPoint(
IPAddress.Parse($"{endPointBytes[0]}.{endPointBytes[1]}.{endPointBytes[2]}.{endPointBytes[3]}")
, 0));
UserConnectionType = ConnectionType.ACTIVE;
}
public string OnEnterPassiveMode()
{
var listeningPort = ClientDataConnection.InitializePassiveConnection();
//send IP of server cuz by sending local ip client won't be able to connect
var addressBytes = IPAddress.Parse(DefaultServerValues.ServerExternalIP).GetAddressBytes();
UserConnectionType = ConnectionType.PASSIVE;
return(string.Format(
"Entering Passive Mode ({0},{1},{2},{3},{4},{5})",
addressBytes[0],
addressBytes[1],
addressBytes[2],
addressBytes[3],
(byte)(listeningPort / 256),
listeningPort % 256));
}
public async Task OnDataChannelEncryptionEnabled()
{
if (!IsEncryptionSupported)
{
SendResponse(new FtpReply()
{
ReplyCode = FtpReplyCode.NotImplemented, Message = "Server is not configured to support SSL/TLS."
}, false);
return;
}
ClientDataConnection.ActivateEncryption();
ActionsTracker.ConnectionSecurityChanged(null, new ConnectionSecurityChangedEventArgs()
{
EndPoint = ClientInitialRemoteEndPoint,
Security = ConnectionFlags.HasFlag(ControlConnectionFlags.UsingTLSorSSL)
? ConnectionSecurity.Both
: ConnectionSecurity.DataChannelSecured
});
Logger.Log($"Enabled encryption for datachannel : {ClientInitialRemoteEndPoint.ToString()}"
, RecordKind.Status);
}
