Init commit

shadowsocks.go

@@ -0,0 +1,89 @@
+package shadowsocks
+
+import (
+	"context"
+	"crypto/md5"
+	"fmt"
+	"net"
+
+	"github.com/sagernet/sing/common"
+	E "github.com/sagernet/sing/common/exceptions"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+)
+
+var (
+	ErrBadKey          = E.New("bad key")
+	ErrMissingPassword = E.New("missing password")
+)
+
+type Method interface {
+	Name() string
+	KeyLength() int
+	DialConn(conn net.Conn, destination M.Socksaddr) (net.Conn, error)
+	DialEarlyConn(conn net.Conn, destination M.Socksaddr) net.Conn
+	DialPacketConn(conn net.Conn) N.NetPacketConn
+}
+
+type Service interface {
+	N.TCPConnectionHandler
+	N.UDPHandler
+}
+
+type Handler interface {
+	N.TCPConnectionHandler
+	N.UDPConnectionHandler
+	E.Handler
+}
+
+type UserContext[U comparable] struct {
+	context.Context
+	User U
+}
+
+type ServerConnError struct {
+	net.Conn
+	Source M.Socksaddr
+	Cause  error
+}
+
+func (e *ServerConnError) Close() error {
+	if conn, ok := common.Cast[*net.TCPConn](e.Conn); ok {
+		conn.SetLinger(0)
+	}
+	return e.Conn.Close()
+}
+
+func (e *ServerConnError) Unwrap() error {
+	return e.Cause
+}
+
+func (e *ServerConnError) Error() string {
+	return fmt.Sprint("shadowsocks: serve TCP from ", e.Source, ": ", e.Cause)
+}
+
+type ServerPacketError struct {
+	Source M.Socksaddr
+	Cause  error
+}
+
+func (e *ServerPacketError) Unwrap() error {
+	return e.Cause
+}
+
+func (e *ServerPacketError) Error() string {
+	return fmt.Sprint("shadowsocks: serve UDP from ", e.Source, ": ", e.Cause)
+}
+
+func Key(password []byte, keySize int) []byte {
+	var b, prev []byte
+	h := md5.New()
+	for len(b) < keySize {
+		h.Write(prev)
+		h.Write([]byte(password))
+		b = h.Sum(b)
+		prev = b[len(b)-h.Size():]
+		h.Reset()
+	}
+	return b[:keySize]
+}