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// Copyright (c) 2016-present Cloud <cloud@txthinking.com>

//

// This program is free software; you can redistribute it and/or

// modify it under the terms of version 3 of the GNU General Public

// License as published by the Free Software Foundation.

//

// This program is distributed in the hope that it will be useful, but

// WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

// General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with this program. If not, see <https://www.gnu.org/licenses/>.

package brook

import (

"bytes"

"encoding/binary"

"errors"

"io"

"net"

"time"

"github.com/txthinking/socks5"

"github.com/txthinking/x"

)

type SimpleStreamServer struct {

Client net.Conn

Timeout int

RB []byte

WB []byte

network string

src string

dst string

}

func NewSimpleStreamServer(password []byte, src string, client net.Conn, timeout, udptimeout int) (Exchanger, error) {

if timeout != 0 {

if err := client.SetDeadline(time.Now().Add(time.Duration(timeout) * time.Second)); err != nil {

return nil, err

}

}

s := &SimpleStreamServer{Client: client, Timeout: timeout, src: src}

b := x.BP2048.Get().([]byte)

if _, err := io.ReadFull(s.Client, b[:32+2]); err != nil {

x.BP2048.Put(b)

return nil, err

}

if bytes.Compare(password, b[:32]) != 0 {

x.BP2048.Put(b)

WaitReadErr(s.Client)

return nil, errors.New("Password is wrong")

}

l := int(binary.BigEndian.Uint16(b[32:34]))

if l > 2048 {

x.BP2048.Put(b)

return nil, errors.New("data too long")

}

if _, err := io.ReadFull(s.Client, b[:l]); err != nil {

x.BP2048.Put(b)

return nil, err

}

i := int64(binary.BigEndian.Uint32(b[:4]))

if time.Now().Unix()-i > 60 {

x.BP2048.Put(b)

WaitReadErr(s.Client)

return nil, errors.New("Expired request")

}

if i%2 == 0 {

s.network = "tcp"

s.RB = b

s.WB = x.BP2048.Get().([]byte)

}

if i%2 == 1 {

s.network = "udp"

s.Timeout = udptimeout

s.RB = x.BP65507.Get().([]byte)

copy(s.RB[:l], b[:l])

x.BP2048.Put(b)

s.WB = x.BP65507.Get().([]byte)

}

s.dst = socks5.ToAddress(s.RB[4], s.RB[4+1:l-2], s.RB[l-2:])

return ServerGate(s)

}

func (s *SimpleStreamServer) Exchange(remote net.Conn) error {

go func() {

if s.network == "tcp" && s.Timeout == 0 {

io.Copy(s.Client, remote)

return

}

for {

if s.Timeout != 0 {

if err := remote.SetDeadline(time.Now().Add(time.Duration(s.Timeout) * time.Second)); err != nil {

return

}

}

if s.network == "tcp" {

l, err := remote.Read(s.WB)

if err != nil {

return

}

if _, err := s.Client.Write(s.WB[:l]); err != nil {

return

}

}

if s.network == "udp" {

l, err := remote.Read(s.WB[2:])

if err != nil {

return

}

binary.BigEndian.PutUint16(s.WB[:2], uint16(l))

if _, err := s.Client.Write(s.WB[:2+l]); err != nil {

return

}

}

}

}()

if s.network == "tcp" && s.Timeout == 0 {

io.Copy(remote, s.Client)

return nil

}

for {

if s.Timeout != 0 {

if err := s.Client.SetDeadline(time.Now().Add(time.Duration(s.Timeout) * time.Second)); err != nil {

return nil

}

}

if s.network == "tcp" {

l, err := s.Client.Read(s.RB)

if err != nil {

return nil

}

if _, err := remote.Write(s.RB[:l]); err != nil {

return nil

}

}

if s.network == "udp" {

if _, err := io.ReadFull(s.Client, s.RB[:2]); err != nil {

return nil

}

l := int(binary.BigEndian.Uint16(s.RB[:2]))

if l > 65507-2 {

return errors.New("packet too long")

}

if _, err := io.ReadFull(s.Client, s.RB[2:2+l]); err != nil {

return nil

}

if _, err := remote.Write(s.RB[2 : 2+l]); err != nil {

return nil

}

}

}

return nil

}

func (s *SimpleStreamServer) Network() string {

return s.network

}

func (s *SimpleStreamServer) Src() string {

return s.src

}

func (s *SimpleStreamServer) Dst() string {

return s.dst

}

func (s *SimpleStreamServer) Clean() {

if s.network == "tcp" {

x.BP2048.Put(s.WB)

x.BP2048.Put(s.RB)

}

if s.network == "udp" {

x.BP65507.Put(s.WB)

x.BP65507.Put(s.RB)

}

}