172 lines
3.0 KiB
Go
172 lines
3.0 KiB
Go
package gosocks5
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import (
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"io"
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//"log"
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"net"
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"sync"
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"time"
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)
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type Selector interface {
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// return supported methods
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Methods() []uint8
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// select method
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Select(methods ...uint8) (method uint8)
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// on method selected
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OnSelected(method uint8, conn net.Conn) (net.Conn, error)
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}
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type Conn struct {
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c net.Conn
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selector Selector
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method uint8
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isClient bool
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handshaked bool
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handshakeMutex sync.Mutex
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handshakeErr error
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}
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func ClientConn(conn net.Conn, selector Selector) *Conn {
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return &Conn{
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c: conn,
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selector: selector,
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isClient: true,
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}
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}
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func ServerConn(conn net.Conn, selector Selector) *Conn {
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return &Conn{
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c: conn,
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selector: selector,
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}
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}
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func (conn *Conn) Handleshake() error {
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conn.handshakeMutex.Lock()
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defer conn.handshakeMutex.Unlock()
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if err := conn.handshakeErr; err != nil {
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return err
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}
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if conn.handshaked {
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return nil
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}
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if conn.isClient {
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conn.handshakeErr = conn.clientHandshake()
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} else {
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conn.handshakeErr = conn.serverHandshake()
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}
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return conn.handshakeErr
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}
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func (conn *Conn) clientHandshake() error {
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var methods []uint8
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var nm int
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if conn.selector != nil {
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methods = conn.selector.Methods()
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}
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nm = len(methods)
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if nm == 0 {
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nm = 1
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}
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b := make([]byte, 2+nm)
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b[0] = Ver5
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b[1] = uint8(nm)
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copy(b[2:], methods)
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if _, err := conn.c.Write(b); err != nil {
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return err
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}
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if _, err := io.ReadFull(conn.c, b[:2]); err != nil {
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return err
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}
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if b[0] != Ver5 {
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return ErrBadVersion
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}
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if conn.selector != nil {
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c, err := conn.selector.OnSelected(b[1], conn.c)
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if err != nil {
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return err
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}
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conn.c = c
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}
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conn.method = b[1]
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//log.Println("method:", conn.method)
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conn.handshaked = true
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return nil
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}
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func (conn *Conn) serverHandshake() error {
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methods, err := ReadMethods(conn.c)
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if err != nil {
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return err
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}
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method := MethodNoAuth
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if conn.selector != nil {
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method = conn.selector.Select(methods...)
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}
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if _, err := conn.c.Write([]byte{Ver5, method}); err != nil {
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return err
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}
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if conn.selector != nil {
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c, err := conn.selector.OnSelected(method, conn.c)
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if err != nil {
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return err
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}
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conn.c = c
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}
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conn.method = method
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//log.Println("method:", method)
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conn.handshaked = true
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return nil
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}
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func (conn *Conn) Read(b []byte) (n int, err error) {
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if err = conn.Handleshake(); err != nil {
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return
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}
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return conn.c.Read(b)
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}
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func (conn *Conn) Write(b []byte) (n int, err error) {
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if err = conn.Handleshake(); err != nil {
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return
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}
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return conn.c.Write(b)
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}
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func (conn *Conn) Close() error {
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return conn.c.Close()
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}
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func (conn *Conn) LocalAddr() net.Addr {
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return conn.c.LocalAddr()
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}
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func (conn *Conn) RemoteAddr() net.Addr {
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return conn.c.RemoteAddr()
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}
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func (conn *Conn) SetDeadline(t time.Time) error {
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return conn.c.SetDeadline(t)
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}
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func (conn *Conn) SetReadDeadline(t time.Time) error {
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return conn.c.SetReadDeadline(t)
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}
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func (conn *Conn) SetWriteDeadline(t time.Time) error {
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return conn.c.SetWriteDeadline(t)
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}
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