package v5 import ( "encoding/binary" "fmt" "io" "net" "net/netip" "strconv" "github.com/Dreamacro/clash/common/utils" C "github.com/Dreamacro/clash/constant" "github.com/Dreamacro/clash/transport/socks5" "github.com/metacubex/quic-go" ) type BufferedReader interface { io.Reader io.ByteReader } type BufferedWriter interface { io.Writer io.ByteWriter } type CommandType byte const ( AuthenticateType = CommandType(0x00) ConnectType = CommandType(0x01) PacketType = CommandType(0x02) DissociateType = CommandType(0x03) HeartbeatType = CommandType(0x04) ) const VER byte = 0x05 func (c CommandType) String() string { switch c { case AuthenticateType: return "Authenticate" case ConnectType: return "Connect" case PacketType: return "Packet" case DissociateType: return "Dissociate" case HeartbeatType: return "Heartbeat" default: return fmt.Sprintf("UnknowCommand: %#x", byte(c)) } } func (c CommandType) BytesLen() int { return 1 } type CommandHead struct { VER byte TYPE CommandType } func NewCommandHead(TYPE CommandType) CommandHead { return CommandHead{ VER: VER, TYPE: TYPE, } } func ReadCommandHead(reader BufferedReader) (c CommandHead, err error) { c.VER, err = reader.ReadByte() if err != nil { return } TYPE, err := reader.ReadByte() if err != nil { return } c.TYPE = CommandType(TYPE) return } func (c CommandHead) WriteTo(writer BufferedWriter) (err error) { err = writer.WriteByte(c.VER) if err != nil { return } err = writer.WriteByte(byte(c.TYPE)) if err != nil { return } return } func (c CommandHead) BytesLen() int { return 1 + c.TYPE.BytesLen() } type Authenticate struct { CommandHead UUID [16]byte TOKEN [32]byte } func NewAuthenticate(UUID [16]byte, TOKEN [32]byte) Authenticate { return Authenticate{ CommandHead: NewCommandHead(AuthenticateType), UUID: UUID, TOKEN: TOKEN, } } func ReadAuthenticateWithHead(head CommandHead, reader BufferedReader) (c Authenticate, err error) { c.CommandHead = head if c.CommandHead.TYPE != AuthenticateType { err = fmt.Errorf("error command type: %s", c.CommandHead.TYPE) return } _, err = io.ReadFull(reader, c.UUID[:]) if err != nil { return } _, err = io.ReadFull(reader, c.TOKEN[:]) if err != nil { return } return } func ReadAuthenticate(reader BufferedReader) (c Authenticate, err error) { head, err := ReadCommandHead(reader) if err != nil { return } return ReadAuthenticateWithHead(head, reader) } func GenToken(state quic.ConnectionState, uuid [16]byte, password string) (token [32]byte, err error) { var tokenBytes []byte tokenBytes, err = state.TLS.ExportKeyingMaterial(utils.StringFromImmutableBytes(uuid[:]), utils.ImmutableBytesFromString(password), 32) if err != nil { return } copy(token[:], tokenBytes) return } func (c Authenticate) WriteTo(writer BufferedWriter) (err error) { err = c.CommandHead.WriteTo(writer) if err != nil { return } _, err = writer.Write(c.UUID[:]) if err != nil { return } _, err = writer.Write(c.TOKEN[:]) if err != nil { return } return } func (c Authenticate) BytesLen() int { return c.CommandHead.BytesLen() + 16 + 32 } type Connect struct { CommandHead ADDR Address } func NewConnect(ADDR Address) Connect { return Connect{ CommandHead: NewCommandHead(ConnectType), ADDR: ADDR, } } func ReadConnectWithHead(head CommandHead, reader BufferedReader) (c Connect, err error) { c.CommandHead = head if c.CommandHead.TYPE != ConnectType { err = fmt.Errorf("error command type: %s", c.CommandHead.TYPE) return } c.ADDR, err = ReadAddress(reader) if err != nil { return } return } func ReadConnect(reader BufferedReader) (c Connect, err error) { head, err := ReadCommandHead(reader) if err != nil { return } return ReadConnectWithHead(head, reader) } func (c Connect) WriteTo(writer BufferedWriter) (err error) { err = c.CommandHead.WriteTo(writer) if err != nil { return } err = c.ADDR.WriteTo(writer) if err != nil { return } return } func (c Connect) BytesLen() int { return c.CommandHead.BytesLen() + c.ADDR.BytesLen() } type Packet struct { CommandHead ASSOC_ID uint16 PKT_ID uint16 FRAG_TOTAL uint8 FRAG_ID uint8 SIZE uint16 ADDR Address DATA []byte } func NewPacket(ASSOC_ID uint16, PKT_ID uint16, FRGA_TOTAL uint8, FRAG_ID uint8, SIZE uint16, ADDR Address, DATA []byte) Packet { return Packet{ CommandHead: NewCommandHead(PacketType), ASSOC_ID: ASSOC_ID, PKT_ID: PKT_ID, FRAG_ID: FRAG_ID, FRAG_TOTAL: FRGA_TOTAL, SIZE: SIZE, ADDR: ADDR, DATA: DATA, } } func ReadPacketWithHead(head CommandHead, reader BufferedReader) (c Packet, err error) { c.CommandHead = head if c.CommandHead.TYPE != PacketType { err = fmt.Errorf("error command type: %s", c.CommandHead.TYPE) return } err = binary.Read(reader, binary.BigEndian, &c.ASSOC_ID) if err != nil { return } err = binary.Read(reader, binary.BigEndian, &c.PKT_ID) if err != nil { return } err = binary.Read(reader, binary.BigEndian, &c.FRAG_TOTAL) if err != nil { return } err = binary.Read(reader, binary.BigEndian, &c.FRAG_ID) if err != nil { return } err = binary.Read(reader, binary.BigEndian, &c.SIZE) if err != nil { return } c.ADDR, err = ReadAddress(reader) if err != nil { return } c.DATA = make([]byte, c.SIZE) _, err = io.ReadFull(reader, c.DATA) if err != nil { return } return } func ReadPacket(reader BufferedReader) (c Packet, err error) { head, err := ReadCommandHead(reader) if err != nil { return } return ReadPacketWithHead(head, reader) } func (c Packet) WriteTo(writer BufferedWriter) (err error) { err = c.CommandHead.WriteTo(writer) if err != nil { return } err = binary.Write(writer, binary.BigEndian, c.ASSOC_ID) if err != nil { return } err = binary.Write(writer, binary.BigEndian, c.PKT_ID) if err != nil { return } err = binary.Write(writer, binary.BigEndian, c.FRAG_TOTAL) if err != nil { return } err = binary.Write(writer, binary.BigEndian, c.FRAG_ID) if err != nil { return } err = binary.Write(writer, binary.BigEndian, c.SIZE) if err != nil { return } err = c.ADDR.WriteTo(writer) if err != nil { return } _, err = writer.Write(c.DATA) if err != nil { return } return } func (c Packet) BytesLen() int { return c.CommandHead.BytesLen() + 4 + 2 + c.ADDR.BytesLen() + len(c.DATA) } var PacketOverHead = NewPacket(0, 0, 0, 0, 0, NewAddressAddrPort(netip.AddrPortFrom(netip.IPv6Unspecified(), 0)), nil).BytesLen() type Dissociate struct { CommandHead ASSOC_ID uint16 } func NewDissociate(ASSOC_ID uint16) Dissociate { return Dissociate{ CommandHead: NewCommandHead(DissociateType), ASSOC_ID: ASSOC_ID, } } func ReadDissociateWithHead(head CommandHead, reader BufferedReader) (c Dissociate, err error) { c.CommandHead = head if c.CommandHead.TYPE != DissociateType { err = fmt.Errorf("error command type: %s", c.CommandHead.TYPE) return } err = binary.Read(reader, binary.BigEndian, &c.ASSOC_ID) if err != nil { return } return } func ReadDissociate(reader BufferedReader) (c Dissociate, err error) { head, err := ReadCommandHead(reader) if err != nil { return } return ReadDissociateWithHead(head, reader) } func (c Dissociate) WriteTo(writer BufferedWriter) (err error) { err = c.CommandHead.WriteTo(writer) if err != nil { return } err = binary.Write(writer, binary.BigEndian, c.ASSOC_ID) if err != nil { return } return } func (c Dissociate) BytesLen() int { return c.CommandHead.BytesLen() + 4 } type Heartbeat struct { CommandHead } func NewHeartbeat() Heartbeat { return Heartbeat{ CommandHead: NewCommandHead(HeartbeatType), } } func ReadHeartbeatWithHead(head CommandHead, reader BufferedReader) (c Heartbeat, err error) { c.CommandHead = head if c.CommandHead.TYPE != HeartbeatType { err = fmt.Errorf("error command type: %s", c.CommandHead.TYPE) return } return } func ReadHeartbeat(reader BufferedReader) (c Heartbeat, err error) { head, err := ReadCommandHead(reader) if err != nil { return } return ReadHeartbeatWithHead(head, reader) } // Addr types const ( AtypDomainName byte = 0 AtypIPv4 byte = 1 AtypIPv6 byte = 2 AtypNone byte = 255 // Address type None is used in Packet commands that is not the first fragment of a UDP packet. ) type Address struct { TYPE byte ADDR []byte PORT uint16 } func NewAddress(metadata *C.Metadata) Address { var addrType byte var addr []byte switch metadata.AddrType() { case socks5.AtypIPv4: addrType = AtypIPv4 addr = metadata.DstIP.AsSlice() case socks5.AtypIPv6: addrType = AtypIPv6 addr = metadata.DstIP.AsSlice() case socks5.AtypDomainName: addrType = AtypDomainName addr = make([]byte, len(metadata.Host)+1) addr[0] = byte(len(metadata.Host)) copy(addr[1:], metadata.Host) } return Address{ TYPE: addrType, ADDR: addr, PORT: metadata.DstPort, } } func NewAddressNetAddr(addr net.Addr) (Address, error) { if addr, ok := addr.(interface{ AddrPort() netip.AddrPort }); ok { if addrPort := addr.AddrPort(); addrPort.IsValid() { // sing's M.Socksaddr maybe return an invalid AddrPort if it's a DomainName return NewAddressAddrPort(addrPort), nil } } addrStr := addr.String() if addrPort, err := netip.ParseAddrPort(addrStr); err == nil { return NewAddressAddrPort(addrPort), nil } metadata := &C.Metadata{} if err := metadata.SetRemoteAddress(addrStr); err != nil { return Address{}, err } return NewAddress(metadata), nil } func NewAddressAddrPort(addrPort netip.AddrPort) Address { var addrType byte port := addrPort.Port() addr := addrPort.Addr().Unmap() if addr.Is4() { addrType = AtypIPv4 } else { addrType = AtypIPv6 } return Address{ TYPE: addrType, ADDR: addr.AsSlice(), PORT: port, } } func ReadAddress(reader BufferedReader) (c Address, err error) { c.TYPE, err = reader.ReadByte() if err != nil { return } switch c.TYPE { case AtypIPv4: c.ADDR = make([]byte, net.IPv4len) _, err = io.ReadFull(reader, c.ADDR) if err != nil { return } case AtypIPv6: c.ADDR = make([]byte, net.IPv6len) _, err = io.ReadFull(reader, c.ADDR) if err != nil { return } case AtypDomainName: var addrLen byte addrLen, err = reader.ReadByte() if err != nil { return } c.ADDR = make([]byte, addrLen+1) c.ADDR[0] = addrLen _, err = io.ReadFull(reader, c.ADDR[1:]) if err != nil { return } } if c.TYPE == AtypNone { return } err = binary.Read(reader, binary.BigEndian, &c.PORT) if err != nil { return } return } func (c Address) WriteTo(writer BufferedWriter) (err error) { err = writer.WriteByte(c.TYPE) if err != nil { return } if c.TYPE == AtypNone { return } _, err = writer.Write(c.ADDR[:]) if err != nil { return } err = binary.Write(writer, binary.BigEndian, c.PORT) if err != nil { return } return } func (c Address) String() string { switch c.TYPE { case AtypDomainName: return net.JoinHostPort(string(c.ADDR[1:]), strconv.Itoa(int(c.PORT))) default: addr, _ := netip.AddrFromSlice(c.ADDR) addrPort := netip.AddrPortFrom(addr, c.PORT) return addrPort.String() } } func (c Address) SocksAddr() socks5.Addr { addr := make([]byte, 1+len(c.ADDR)+2) switch c.TYPE { case AtypIPv4: addr[0] = socks5.AtypIPv4 case AtypIPv6: addr[0] = socks5.AtypIPv6 case AtypDomainName: addr[0] = socks5.AtypDomainName } copy(addr[1:], c.ADDR) binary.BigEndian.PutUint16(addr[len(addr)-2:], c.PORT) return addr } func (c Address) UDPAddr() *net.UDPAddr { return &net.UDPAddr{ IP: c.ADDR, Port: int(c.PORT), Zone: "", } } func (c Address) BytesLen() int { return 1 + len(c.ADDR) + 2 } const ( ProtocolError = quic.ApplicationErrorCode(0xfffffff0) AuthenticationFailed = quic.ApplicationErrorCode(0xfffffff1) AuthenticationTimeout = quic.ApplicationErrorCode(0xfffffff2) BadCommand = quic.ApplicationErrorCode(0xfffffff3) )