* Send socks5 handshake respond before read the target address
So that the next package will (hopefully) contain the first data chunk which means we could get a 'random' first package size.

* Try read available data before send first packet

* Add random size first packet
But commented out ^u^

* Oops forget to delete some test code

And farewell.

This reverts commit be3cc3f3a6.

This reverts commit b04c59d8e6.

Check null ref (#940)

No more http->socks5 transform.

This gives us the possibility to chose SS server based on dest address.

Also, fix typo in ProxyForm

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

Shadowsocks don't need to reconnect, which is the software's
responsibility to retry.

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

- Use readonly object as lock

Info from stackoverflow:

If I want to be sure that it will be locked for all threads inside my
application:
The lock object has to be static, if it locks access to static state.
Otherwise it has to be instance, because there's no need to lock state of
one class instance, and prevent other threads to work with another class
instance at the same time.

everyone says that the object has to be "readonly" I didn't found the
reason
Well, it doesn't have to be. This is just a best practice, which helps you
to avoid errors.

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

It is better to log them.

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

* Add HTTP proxy support in forward proxy

Signed-off-by: noisyfox <timemanager.rick@gmail.com>

* Typo

* Throw exception if forward proxy not supported.

after creation.

Becuase we put handler.Start() call after timeout check and
lastActivity is initialized in Start(), this will lead to a
incorrect timeout.

Also because we will call handler.Start() right after the
constructor and timeout check, so it makes no difference
where we put the initializtion of lastActivity. We won't do
this again in Start() because DateTime.Now will consumes a
lot of cpu time.

- Drop irrelevant changes
- Closes #723

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

- Move to seperate model

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

- New wrapper to handle tcp socket connection.
- Fix some memory leak.

Signed-off-by: noisyfox <timemanager.rick@gmail.com>

Caused by not call SocketAsyncEventArgs.Dispose().

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

Now it will close all existing TCP relay connections
while reloading the listener.

Signed-off-by: noisyfox <timemanager.rick@gmail.com>

To prevent "The IAsyncResult object was not returned from
the corresponding asynchronous method on this class." exception.

Signed-off-by: noisyfox <timemanager.rick@gmail.com>

To avoid unreadable and uncessary output

Signed-off-by: noisyfox <timemanager.rick@gmail.com>

At that time the remote even doesn't exist.
Also this debug output doesn't make any sense because when handling
udp request, this tcp connection won't have any meaningful data.
So I simply removed these two lines.

Signed-off-by: noisyfox <timemanager.rick@gmail.com>

-Use dual-mode socket & DnsEndPoint to handle all domain name connection.
-Move all socket creation into one single function.

So that we could treat domain name just like ipv4 & ipv6 address.
This also solves the async domain solving problem because the os will
hanlde it for us.

Signed-off-by: noisyfox <timemanager.rick@gmail.com>

Fix wrong output in proxyConnectTimer_Elapsed.

Signed-off-by: noisyfox <timemanager.rick@gmail.com>

- use null conditional access in case some connections been
  cancelled unexpectedly and may cause null reference exception
- Refine error message
- use conditional operator to simplify some code

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

- display user-friendly server name
- clarify proxy type

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

# Conflicts:
#	shadowsocks-csharp/Controller/Service/TCPRelay.cs
#	shadowsocks-csharp/Controller/ShadowsocksController.cs
#	shadowsocks-csharp/View/MenuViewController.cs

I can't wait until PR #604 get merged, do it manually.

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

Note:
- Added a configuration entry, user should add this
  by hand or reset from scratch.

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

Replaced SocketFlags.None (an enum which euqals 0) from zero.

Correct AvailabilityStatistics's behavior under special strategies like "LoadBalance", which may switch the server several times in a short period.