core

type LWIPStack interface {
	Write([]byte) (int, error)
	Close(LWIPSysCheckTimeoutsClosingType) error
	RestartTimeouts()
	GetRunningStatus() bool
	StartTimeouts()
	StopTimeouts(LWIPSysCheckTimeoutsClosingType)
}

type LWIPSysCheckTimeoutsClosingType uint

type MutexWrapper struct {
	// contains filtered or unexported fields
}

type TCPConn interface {
	// Sent will be called when sent data has been acknowledged by peer.
	Sent(len uint16) error

	// Receive will be called when data arrives from TUN.
	Receive(data []byte) error

	// Err will be called when a fatal error has occurred on the connection.
	// The corresponding pcb is already freed when this callback is called
	Err(err error)

	// LocalClosed will be called when lwIP receives a FIN segment on a
	// connection.
	LocalClosed() error

	// RemoteAddr returns the destination network address.
	RemoteAddr() net.Addr

	// LocalAddr returns the local client network address.
	LocalAddr() net.Addr

	// Read reads data comming from TUN, note that it reads from an
	// underlying pipe that the writer writes in the lwip thread,
	// write op blocks until previous written data is consumed, one
	// should read out all data as soon as possible.
	Read(data []byte) (int, error)

	// Write writes data to TUN.
	Write(data []byte) (int, error)

	// Close closes the connection.
	Close() error

	// CloseWrite closes the writing side by sending a FIN
	// segment to local peer. That means we can write no further
	// data to TUN.
	CloseWrite() error

	// CloseRead closes the reading side. That means we can no longer
	// read more from TUN.
	CloseRead() error

	// Abort aborts the connection by sending a RST segment.
	Abort()

	SetDeadline(t time.Time) error
	SetReadDeadline(t time.Time) error
	SetWriteDeadline(t time.Time) error
}

type TCPConnHandler interface {
	// Handle handles the conn for target.
	Handle(conn net.Conn, target *net.TCPAddr) error
}

type UDPConn interface {
	// LocalAddr returns the local client network address.
	LocalAddr() *net.UDPAddr

	// ReceiveTo will be called when data arrives from TUN, and the received
	// data should be sent to addr.
	ReceiveTo(data []byte, addr *net.UDPAddr) error

	// WriteFrom writes data to TUN, addr will be set as source address of
	// UDP packets that output to TUN.
	WriteFrom(data []byte, addr *net.UDPAddr) (int, error)

	// Close closes the connection.
	Close() error
}

type UDPConnHandler interface {
	// Connect connects the proxy server. Note that target can be nil.
	Connect(conn UDPConn, target *net.UDPAddr) error

	// ReceiveTo will be called when data arrives from TUN.
	ReceiveTo(conn UDPConn, data []byte, addr *net.UDPAddr) error
}