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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 (

"crypto/tls"

"errors"

"net"

"net/url"

"os/exec"

"runtime"

"github.com/txthinking/brook/limits"

"github.com/txthinking/socks5"

)

type QUICClient struct {

Server *socks5.Server

ServerHost string

ServerAddress string

TLSConfig *tls.Config

Password []byte

TCPTimeout int

UDPTimeout int

WithoutBrook bool

PacketConnFactory *PacketConnFactory

}

func NewQUICClient(addr, ip, server, password string, tcpTimeout, udpTimeout int, withoutbrook bool) (*QUICClient, error) {

s5, err := socks5.NewClassicServer(addr, ip, "", "", tcpTimeout, udpTimeout)

if err != nil {

return nil, err

}

u, err := url.Parse(server)

if err != nil {

return nil, err

}

if err := limits.Raise(); err != nil {

Log(Error{"when": "try to raise system limits", "warning": err.Error()})

}

if runtime.GOOS == "linux" {

c := exec.Command("sysctl", "-w", "net.core.rmem_max=2500000")

b, err := c.CombinedOutput()

if err != nil {

Log(Error{"when": "try to raise UDP Receive Buffer Size", "warning": string(b)})

}

}

if runtime.GOOS == "darwin" {

c := exec.Command("sysctl", "-w", "kern.ipc.maxsockbuf=3014656")

b, err := c.CombinedOutput()

if err != nil {

Log(Error{"when": "try to raise UDP Receive Buffer Size", "warning": string(b)})

}

}

p := []byte(password)

if withoutbrook {

p, err = SHA256Bytes([]byte(password))

if err != nil {

return nil, err

}

}

x := &QUICClient{

ServerHost: u.Host,

Server: s5,

Password: p,

TCPTimeout: tcpTimeout,

UDPTimeout: udpTimeout,

WithoutBrook: withoutbrook,

PacketConnFactory: NewPacketConnFactory(),

}

h, _, err := net.SplitHostPort(u.Host)

if err != nil {

return nil, err

}

x.TLSConfig = &tls.Config{ServerName: h, NextProtos: []string{"h3"}}

return x, nil

}

func (x *QUICClient) ListenAndServe() error {

return x.Server.ListenAndServe(x)

}

func (x *QUICClient) TCPHandle(s *socks5.Server, c *net.TCPConn, r *socks5.Request) error {

if r.Cmd == socks5.CmdConnect {

sa := x.ServerAddress

if sa == "" {

sa = x.ServerHost

}

rc, err := QUICDialTCP("", "", sa, x.TLSConfig, x.TCPTimeout)

if err != nil {

return ErrorReply(r, c, err)

}

defer rc.Close()

dst := make([]byte, 0, 1+len(r.DstAddr)+2)

dst = append(dst, r.Atyp)

dst = append(dst, r.DstAddr...)

dst = append(dst, r.DstPort...)

var sc Exchanger

if !x.WithoutBrook {

sc, err = NewStreamClient("tcp", x.Password, c.RemoteAddr().String(), rc, x.TCPTimeout, dst)

}

if x.WithoutBrook {

sc, err = NewSimpleStreamClient("tcp", x.Password, c.RemoteAddr().String(), rc, x.TCPTimeout, dst)

}

if err != nil {

return ErrorReply(r, c, err)

}

defer sc.Clean()

a, address, port, err := socks5.ParseAddress(rc.LocalAddr().String())

if err != nil {

return ErrorReply(r, c, err)

}

rp := socks5.NewReply(socks5.RepSuccess, a, address, port)

if _, err := rp.WriteTo(c); err != nil {

return err

}

if err := sc.Exchange(c); err != nil {

return nil

}

return nil

}

if r.Cmd == socks5.CmdUDP {

_, err := r.UDP(c, x.Server.ServerAddr)

if err != nil {

return err

}

return nil

}

return socks5.ErrUnsupportCmd

}

func (x *QUICClient) UDPHandle(s *socks5.Server, addr *net.UDPAddr, d *socks5.Datagram) error {

if 12+4+1+len(d.DstAddr)+2+len(d.Data)+16 > 1197 {

return errors.New("quic max datagram size is 1197")

}

dstb := append(append([]byte{d.Atyp}, d.DstAddr...), d.DstPort...)

conn, err := x.PacketConnFactory.Handle(addr, dstb, d.Data, func(b []byte) (int, error) {

d.Data = b

return s.UDPConn.WriteToUDP(d.Bytes(), addr)

}, x.UDPTimeout)

if err != nil {

return err

}

if conn == nil {

return nil

}

defer conn.Close()

sa := x.ServerAddress

if sa == "" {

sa = x.ServerHost

}

rc, err := QUICDialUDP(addr.String(), d.Address(), sa, x.TLSConfig, x.UDPTimeout)

if err != nil {

return err

}

defer rc.Close()

var sc Exchanger

if !x.WithoutBrook {

sc, err = NewPacketClient(x.Password, addr.String(), rc, x.UDPTimeout, dstb)

}

if x.WithoutBrook {

sc, err = NewSimplePacketClient(x.Password, addr.String(), rc, x.UDPTimeout, dstb)

}

if err != nil {

return err

}

defer sc.Clean()

if err := sc.Exchange(conn); err != nil {

return nil

}

return nil

}

func (x *QUICClient) Shutdown() error {

return x.Server.Shutdown()

}