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Copy pathserver.go
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285 lines (271 loc) · 5.71 KB
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package brook
import (
"io"
"log"
"net"
"time"
cache "github.com/patrickmn/go-cache"
"github.com/txthinking/socks5"
)
// Server
type Server struct {
Password []byte
TCPAddr *net.TCPAddr
UDPAddr *net.UDPAddr
TCPListen *net.TCPListener
UDPConn *net.UDPConn
UDPExchanges *cache.Cache
TCPDeadline int
TCPTimeout int
UDPDeadline int
}
// NewServer
func NewServer(addr, password string, tcpTimeout, tcpDeadline, udpDeadline int) (*Server, error) {
taddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
return nil, err
}
uaddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return nil, err
}
cs := cache.New(cache.NoExpiration, cache.NoExpiration)
s := &Server{
Password: []byte(password),
TCPAddr: taddr,
UDPAddr: uaddr,
UDPExchanges: cs,
TCPTimeout: tcpTimeout,
TCPDeadline: tcpDeadline,
UDPDeadline: udpDeadline,
}
return s, nil
}
// Run server
func (s *Server) ListenAndServe() error {
errch := make(chan error)
go func() {
errch <- s.RunTCPServer()
}()
go func() {
errch <- s.RunUDPServer()
}()
return <-errch
}
// RunTCPServer starts tcp server
func (s *Server) RunTCPServer() error {
var err error
s.TCPListen, err = net.ListenTCP("tcp", s.TCPAddr)
if err != nil {
return err
}
defer s.TCPListen.Close()
for {
c, err := s.TCPListen.AcceptTCP()
if err != nil {
return err
}
go func(c *net.TCPConn) {
defer c.Close()
if s.TCPTimeout != 0 {
if err := c.SetKeepAlivePeriod(time.Duration(s.TCPTimeout) * time.Second); err != nil {
log.Println(err)
return
}
}
if s.TCPDeadline != 0 {
if err := c.SetDeadline(time.Now().Add(time.Duration(s.TCPDeadline) * time.Second)); err != nil {
log.Println(err)
return
}
}
if err := s.TCPHandle(c); err != nil {
log.Println(err)
}
}(c)
}
return nil
}
// RunUDPServer starts udp server
func (s *Server) RunUDPServer() error {
var err error
s.UDPConn, err = net.ListenUDP("udp", s.UDPAddr)
if err != nil {
return err
}
defer s.UDPConn.Close()
for {
b := make([]byte, 65536)
n, addr, err := s.UDPConn.ReadFromUDP(b)
if err != nil {
return err
}
go func(addr *net.UDPAddr, b []byte) {
if err := s.UDPHandle(addr, b); err != nil {
log.Println(err)
return
}
}(addr, b[0:n])
}
return nil
}
// TCPHandle handle request
func (s *Server) TCPHandle(c *net.TCPConn) error {
cn := make([]byte, 12)
if _, err := io.ReadFull(c, cn); err != nil {
return err
}
ck, err := GetKey(s.Password, cn)
if err != nil {
return err
}
var b []byte
b, cn, err = ReadFrom(c, ck, cn, true)
if err != nil {
return err
}
address := socks5.ToAddress(b[0], b[1:len(b)-2], b[len(b)-2:])
tmp, err := Dial.Dial("tcp", address)
if err != nil {
return err
}
rc := tmp.(*net.TCPConn)
defer rc.Close()
if s.TCPTimeout != 0 {
if err := rc.SetKeepAlivePeriod(time.Duration(s.TCPTimeout) * time.Second); err != nil {
return err
}
}
if s.TCPDeadline != 0 {
if err := rc.SetDeadline(time.Now().Add(time.Duration(s.TCPDeadline) * time.Second)); err != nil {
return err
}
}
go func() {
k, n, err := PrepareKey(s.Password)
if err != nil {
log.Println(err)
return
}
if _, err := c.Write(n); err != nil {
return
}
var b [1024 * 2]byte
for {
if s.TCPDeadline != 0 {
if err := rc.SetDeadline(time.Now().Add(time.Duration(s.TCPDeadline) * time.Second)); err != nil {
return
}
}
i, err := rc.Read(b[:])
if err != nil {
return
}
n, err = WriteTo(c, b[0:i], k, n, false)
if err != nil {
return
}
}
}()
for {
if s.TCPDeadline != 0 {
if err := c.SetDeadline(time.Now().Add(time.Duration(s.TCPDeadline) * time.Second)); err != nil {
return nil
}
}
b, cn, err = ReadFrom(c, ck, cn, false)
if err != nil {
return nil
}
if _, err := rc.Write(b); err != nil {
return nil
}
}
return nil
}
// UDPHandle handle packet
func (s *Server) UDPHandle(addr *net.UDPAddr, b []byte) error {
a, h, p, data, err := Decrypt(s.Password, b)
if err != nil {
return err
}
send := func(ue *socks5.UDPExchange, data []byte) error {
_, err := ue.RemoteConn.Write(data)
if err != nil {
return err
}
return nil
}
var ue *socks5.UDPExchange
iue, ok := s.UDPExchanges.Get(addr.String())
if ok {
ue = iue.(*socks5.UDPExchange)
return send(ue, data)
}
address := socks5.ToAddress(a, h, p)
c, err := Dial.Dial("udp", address)
if err != nil {
return err
}
rc := c.(*net.UDPConn)
ue = &socks5.UDPExchange{
ClientAddr: addr,
RemoteConn: rc,
}
if err := send(ue, data); err != nil {
ue.RemoteConn.Close()
return err
}
s.UDPExchanges.Set(ue.ClientAddr.String(), ue, cache.DefaultExpiration)
go func(ue *socks5.UDPExchange) {
defer func() {
s.UDPExchanges.Delete(ue.ClientAddr.String())
ue.RemoteConn.Close()
}()
var b [65536]byte
for {
if s.UDPDeadline != 0 {
if err := ue.RemoteConn.SetDeadline(time.Now().Add(time.Duration(s.UDPDeadline) * time.Second)); err != nil {
break
}
}
n, err := ue.RemoteConn.Read(b[:])
if err != nil {
break
}
a, addr, port, err := socks5.ParseAddress(ue.ClientAddr.String())
if err != nil {
log.Println(err)
break
}
d := make([]byte, 0, 7)
d = append(d, a)
d = append(d, addr...)
d = append(d, port...)
d = append(d, b[0:n]...)
cd, err := Encrypt(s.Password, d)
if err != nil {
log.Println(err)
break
}
if _, err := s.UDPConn.WriteToUDP(cd, ue.ClientAddr); err != nil {
break
}
}
}(ue)
return nil
}
// Shutdown server
func (s *Server) Shutdown() error {
var err, err1 error
if s.TCPListen != nil {
err = s.TCPListen.Close()
}
if s.UDPConn != nil {
err1 = s.UDPConn.Close()
}
if err != nil {
return err
}
return err1
}