forked from txthinking/brook
/
bkclient.go
185 lines (174 loc) · 4.45 KB
/
bkclient.go
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package brook
import (
"crypto/aes"
"crypto/rand"
"io"
"log"
"net"
"time"
"github.com/txthinking/ant"
"github.com/txthinking/brook/music"
"github.com/txthinking/socks5"
)
// BKClient is the client of brook protocol
type BKClient struct {
Address string
Password string
Server string
Timeout int
Deadline int
Music music.Music
Dial Dialer
Listen net.Listener
}
// NewBKClient returns a new BKClient, dial can be set to nil
func NewBKClient(address, server, password string, timeout, deadline int, m string, dial Dialer) (*BKClient, error) {
msc, err := music.GetMusic(m)
if err != nil {
return nil, err
}
if dial == nil {
dial = &DefaultDial{}
}
c := &BKClient{
Address: address,
Server: server,
Password: password,
Timeout: timeout,
Deadline: deadline,
Music: msc,
Dial: dial,
}
return c, nil
}
// ListenAndServe will let client start to listen and serve
func (c *BKClient) ListenAndServe() error {
ta, err := net.ResolveTCPAddr("tcp", c.Address)
if err != nil {
return err
}
l, err := net.ListenTCP("tcp", ta)
if err != nil {
return err
}
defer l.Close()
c.Listen = l
for {
conn, err := l.AcceptTCP()
if err != nil {
return err
}
go func(conn *net.TCPConn) {
if err := c.handle(conn); err != nil {
log.Println(err)
}
}(conn)
}
}
// Shutdown used to stop the client
func (c *BKClient) Shutdown() error {
if c.Listen == nil {
return nil
}
return c.Listen.Close()
}
func (c *BKClient) handle(conn *net.TCPConn) error {
defer conn.Close()
if c.Timeout != 0 {
if err := conn.SetKeepAlivePeriod(time.Duration(c.Timeout) * time.Second); err != nil {
return err
}
}
if c.Deadline != 0 {
if err := conn.SetDeadline(time.Now().Add(time.Duration(c.Deadline) * time.Second)); err != nil {
return err
}
}
s := socks5.NewClassicServer(conn)
if err := s.Negotiate(); err != nil {
return err
}
request, err := s.GetRequest()
if err != nil {
return err
}
rawaddr := make([]byte, 0)
rawaddr = append(rawaddr, request.Atyp)
rawaddr = append(rawaddr, request.DstAddr...)
rawaddr = append(rawaddr, request.DstPort...)
rc, err := c.Dial.Dial("tcp", c.Server)
if err != nil {
var p *socks5.Reply
if request.Atyp == socks5.ATYPIPv4 || request.Atyp == socks5.ATYPDomain {
p = socks5.NewReply(socks5.RepHostUnreachable, socks5.ATYPIPv4, []byte{0x00, 0x00, 0x00, 0x00}, []byte{0x00, 0x00})
} else {
p = socks5.NewReply(socks5.RepHostUnreachable, socks5.ATYPIPv6, []byte(net.IPv6zero), []byte{0x00, 0x00})
}
if err := p.WriteTo(conn); err != nil {
return err
}
return err
}
defer rc.Close()
if c.Timeout != 0 {
if rtc, ok := rc.(*net.TCPConn); ok {
if err := rtc.SetKeepAlivePeriod(time.Duration(c.Timeout) * time.Second); err != nil {
return err
}
}
}
if c.Deadline != 0 {
if err := rc.SetDeadline(time.Now().Add(time.Duration(c.Deadline) * time.Second)); err != nil {
return err
}
}
if c.Music != nil {
if _, err := rc.Write(c.Music.GetSong()); err != nil {
return err
}
}
crc, err := c.wrapCipherConn(rc)
if err != nil {
var p *socks5.Reply
if request.Atyp == socks5.ATYPIPv4 || request.Atyp == socks5.ATYPDomain {
p = socks5.NewReply(socks5.RepConnectionRefused, socks5.ATYPIPv4, []byte{0x00, 0x00, 0x00, 0x00}, []byte{0x00, 0x00})
} else {
p = socks5.NewReply(socks5.RepConnectionRefused, socks5.ATYPIPv6, []byte(net.IPv6zero), []byte{0x00, 0x00})
}
if err := p.WriteTo(conn); err != nil {
return err
}
return err
}
if _, err := crc.Write(rawaddr); err != nil {
var p *socks5.Reply
if request.Atyp == socks5.ATYPIPv4 || request.Atyp == socks5.ATYPDomain {
p = socks5.NewReply(socks5.RepConnectionRefused, socks5.ATYPIPv4, []byte{0x00, 0x00, 0x00, 0x00}, []byte{0x00, 0x00})
} else {
p = socks5.NewReply(socks5.RepConnectionRefused, socks5.ATYPIPv6, []byte(net.IPv6zero), []byte{0x00, 0x00})
}
if err := p.WriteTo(conn); err != nil {
return err
}
return err
}
a, addr, port := socks5.ParseAddress(crc.LocalAddr())
if err := socks5.NewReply(socks5.RepSuccess, a, addr, port).WriteTo(conn); err != nil {
return err
}
go func() {
_, _ = io.Copy(conn, crc)
}()
_, _ = io.Copy(crc, conn)
return nil
}
func (c *BKClient) wrapCipherConn(conn net.Conn) (*CipherConn, error) {
iv := make([]byte, aes.BlockSize)
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
return nil, err
}
if _, err := conn.Write(iv); err != nil {
return nil, err
}
return NewCipherConn(conn, []byte(ant.MD5(c.Password)), iv)
}