private SocketSender ReversedConnectionProxy(ref SocketResponder responder, HB32Header route_header, byte[] route_bytes)
{
ConnectionRoute route = ConnectionRoute.FromBytes(route_bytes);
if (route.NextNode.Address.Equals(this.HostAddress))
{
if (route.IsNextNodeProxy)
{
// todo: 反向代理
}
else
{
}
return(null);
}
else
{
SocketSender sender = ConnectionRelay(responder, route_header, route);
SocketResponder r = sender.ConvertToResponder();
SocketSender s = responder.ConvertToSender(route_header.I1 > 0);
responder = r;
return(s);
}
}
public void StartLongConnection()
{
while (IsKeepLongConnection)
{
try
{
LongConnectSender = new SocketSender(CurrentRoute.IsNextNodeProxy);
LongConnectSender.ConnectWithTimeout(CurrentRoute.NextNode.Address, BuildConnectionTimeout);
LongConnectSender.SetTimeout(LongConnectionTimeout, LongConnectionTimeout);
if (CurrentRoute.IsNextNodeProxy)
{
LongConnectSender.SendBytes(SocketPacketFlag.ReversedProxyLongConnectionRequest, CurrentRoute.GetBytes(node_start_index: 1));
LongConnectSender.ReceiveBytes(out HB32Header header, out byte[] bytes);
if (header.Flag != SocketPacketFlag.ProxyResponse)
{
throw new Exception(string.Format("Proxy exception at depth {0} : {1}. {2}",
header.I1, CurrentRoute.ProxyRoute[header.I1], Encoding.UTF8.GetString(bytes)));
}
}
return;
}
catch (Exception ex)
{
Log("Start long connection exception : " + ex.Message, LogLevel.Error);
}
Thread.Sleep(ReconnectInterval);
}
}
/*
*
* private bool DoForwardProxy(Socket client, SocketEndPoint socket_ep)
* {
* socket_ep = AuthenticationProxy(client);
* int error_count = 0;
* while (error_count < 5)
* {
* try
* {
* byte[] proxy_header = ReceiveProxyHeader(client);
* HB32Header recv_header;
* byte[] recv_bytes;
*
* switch ((ProxyHeader)proxy_header[1])
* {
* case ProxyHeader.SendHeader:
* SocketIO.ReceiveBytes(client, out recv_header, out recv_bytes);
* socket_ep.SendHeader(recv_header);
* if (recv_header.Flag == SocketPacketFlag.DisconnectRequest)
* {
* DisposeClient(client, socket_ep);
* return true;
* }
* break;
* case ProxyHeader.SendBytes:
* SocketIO.ReceiveBytes(client, out recv_header, out recv_bytes);
* socket_ep.SendBytes(recv_header, recv_bytes);
* break;
* case ProxyHeader.ReceiveBytes:
* socket_ep.ReceiveBytes(out recv_header, out recv_bytes);
* SocketIO.SendBytes(client, recv_header, recv_bytes);
* break;
* }
*
* error_count = 0;
* }
* catch (SocketException ex)
* {
* error_count++;
* switch (ex.ErrorCode)
* {
* // 远程 client 主机关闭连接
* case 10054:
* DisposeClient(client, socket_ep);
* Log("Connection closed (client closed). " + ex.Message, LogLevel.Info);
* return false;
* // Socket 超时
* case 10060:
* Thread.Sleep(200);
* Log("Socket timeout. " + ex.Message, LogLevel.Trace);
* continue;
* default:
* Log("Server receive data :" + ex.Message, LogLevel.Warn);
* continue;
* }
* }
* catch (Exception ex)
* {
* error_count++;
* if (ex.Message.Contains("Buffer receive error: cannot receive package"))
* {
* DisposeClient(client, socket_ep);
* Log(ex.Message, LogLevel.Trace);
* return false;
* }
* if (ex.Message.Contains("Invalid socket header"))
* {
* DisposeClient(client, socket_ep);
* Log("Connection closed : " + ex.Message, LogLevel.Warn);
* return false;
* }
* Log("Server exception :" + ex.Message, LogLevel.Warn);
* Thread.Sleep(200);
* continue;
* }
* }
* return false;
* }
*/
/// <summary>
/// 完成创建 Socket 过程身份认证的代理过程
/// </summary>
/// <param name="client"></param>
/// <returns>已与Server或下级代理连接成功的 SocketEndPoint 对象</returns>
private SocketSender AuthenticationProxy(Socket client)
{
// todo 重写 21.05.28
byte[] proxy_header;
SocketIO.ReceiveBytes(client, out HB32Header route_header, out byte[] route_bytes);
Debug.Assert(route_bytes[0] == 1);
int pt = 0;
ConnectionRoute route = ConnectionRoute.FromBytes(route_bytes, ref pt);
byte[] key_bytes = new byte[route_bytes.Length - pt];
Array.Copy(route_bytes, pt, key_bytes, 0, key_bytes.Length);
SocketSender proxy_client = new SocketSender(null, route.IsNextNodeProxy);
byte[] bytes_to_send = new byte[0]; // todo
// todo 异常处理
if (route.NextNode.Address.Equals(this.HostAddress))
{
/// 下级为挂载在此的反向代理
/// 利用与反向代理的长连接新建 socket 并通信
}
else
{
/// 下级需正向代理
proxy_client.Connect(route.NextNode.Address, Config.SocketSendTimeout, Config.SocketReceiveTimeout);
}
proxy_client.SendBytes(route_header, bytes_to_send);
if (proxy_client.IsRequireProxyHeader)
{
ReceiveProxyHeader(client);
}
proxy_client.ReceiveBytes(out HB32Header auth_header, out byte[] auth_bytes);
//SocketIO.SendBytes(client, auth_header, auth_bytes);
return(proxy_client);
/*
*
*
* GetAimInfo(route_bytes, out TCPAddress AimAddress, out bool IsAimProxy, out byte[] AimBytes);
* SocketClient socket_client = new SocketClient(AimAddress);
* socket_client.IsWithProxy = IsAimProxy;
* try
* {
* socket_client.Connect(Config.SocketSendTimeOut, Config.SocketReceiveTimeOut);
* socket_client.SendBytes(route_header, AimBytes);
* }
* catch(Exception ex)
* {
* proxy_header = ReceiveProxyHeader(client);
* this.SendBytes(client, SocketPacketFlag.AuthenticationException, "Proxy connect to server failed.");
* throw new Exception("Cannot connect to server : " + ex.Message);
* }
* proxy_header = ReceiveProxyHeader(client);
* socket_client.ReceiveBytes(out HB32Header auth_header, out byte[] auth_bytes);
* this.SendBytes(client, auth_header, auth_bytes);
* return socket_client;
*/
}
private void DisposeClient(SocketSender sender, SocketResponder responder)
{
try
{
sender.Close();
}
catch (Exception) { }
try
{
responder.Close();
}
catch (Exception) { }
}
protected override void ReceiveData(object responderObject)
{
SocketResponder responder = responderObject as SocketResponder;
responder.SetTimeout(Config.SocketSendTimeout, Config.SocketReceiveTimeout);
SocketSender sender = null;
try
{
responder.ReceiveBytes(out HB32Header route_header, out byte[] route_bytes);
if (route_header.Flag == SocketPacketFlag.ProxyRouteRequest)
{
/// Forward connection proxy (from client-side)
sender = ForwardConnectionProxy(responder, route_header, route_bytes);
/// Communication proxy
}
else if (route_header.Flag == SocketPacketFlag.ReversedProxyConnectionRequest)
{
/// Reversed connection proxy (from server-side, triggered in server by long connection)
sender = ReversedConnectionProxy(ref responder, route_header, route_bytes);
/// Communication proxy
}
else if (route_header.Flag == SocketPacketFlag.ReversedProxyLongConnectionRequest)
{
/// Reversed-server long connection socket
}
else
{
}
}
catch (Exception ex)
{
Log("Socket initiate exception :" + ex.Message, LogLevel.Error);
//DisposeClient(sender, responder); 这行不能删
}
}
/// <summary>
/// 当上一级代理不是挂载在当前代理上的节点上时, 利用此方法完成同方向代理的中继, 并返回上级代理结果
/// </summary>
/// <param name="responder"></param>
/// <param name="route"></param>
/// <returns></returns>
private SocketSender ConnectionRelay(SocketResponder responder, HB32Header header, ConnectionRoute route)
{
if (route.IsNextNodeProxy)
{
/// 继续正向代理
SocketSender sender = new SocketSender(true);
string err_msg = "";
try
{
sender.ConnectWithTimeout(route.NextNode.Address, Config.BuildConnectionTimeout);
sender.SetTimeout(Config.SocketSendTimeout, Config.SocketReceiveTimeout);
}
catch (Exception ex)
{
/// 当前代理建立连接失败
err_msg = ex.Message;
}
if (string.IsNullOrEmpty(err_msg))
{
HB32Header next_header = header.Copy();
next_header.I1++;
sender.SendBytes(next_header, route.GetBytes(node_start_index: 1));
sender.ReceiveBytes(out HB32Header respond_header, out byte[] respond_bytes);
if ((respond_header.Flag | SocketPacketFlag.ExceptionFlag) == 0)
{
responder.SendHeader(respond_header);
}
else
{
/// 上级或更上级代理建立连接失败, header 中包含抛出异常的代理位置
responder.SendBytes(respond_header, respond_bytes);
}
}
else
{
HB32Header err_header = header.Copy();
err_header.Flag = (SocketPacketFlag)(((int)err_header.Flag & 0xFFFF00) | 0x90);
responder.SendBytes(err_header, err_msg);
}
return(sender);
}
else
{
/// 直连 server
SocketSender sender = new SocketSender(false);
string err_msg = "";
try
{
sender.ConnectWithTimeout(route.ServerAddress.Address, Config.BuildConnectionTimeout);
sender.SetTimeout(Config.SocketSendTimeout, Config.SocketReceiveTimeout);
}
catch (Exception ex)
{
err_msg = ex.Message;
}
/// response
if (string.IsNullOrEmpty(err_msg))
{
HB32Header resp_header = header.Copy();
resp_header.Flag = (SocketPacketFlag)(((int)resp_header.Flag & 0xFFFF00) | 0x10);
responder.SendHeader(resp_header);
}
else
{
HB32Header err_header = header.Copy();
err_header.Flag = (SocketPacketFlag)(((int)err_header.Flag & 0xFFFF00) | 0x90);
responder.SendBytes(err_header, err_msg);
}
return(sender);
}
}
public SocketSender ConvertToSender(bool isWithProxy)
{
SocketSender sender = new SocketSender(this.client, isWithProxy);
return(sender);
}