package shadowsocks2022 import ( "crypto/cipher" "io" "github.com/lunixbochs/struc" "github.com/v2fly/v2ray-core/v5/common/buf" "github.com/v2fly/v2ray-core/v5/common/net" "github.com/v2fly/v2ray-core/v5/common/protocol" ) //go:generate go run github.com/v2fly/v2ray-core/v5/common/errors/errorgen type KeyDerivation interface { GetSessionSubKey(effectivePsk, Salt []byte, OutKey []byte) error GetIdentitySubKey(effectivePsk, Salt []byte, OutKey []byte) error } type Method interface { GetSessionSubKeyAndSaltLength() int GetStreamAEAD(SessionSubKey []byte) (cipher.AEAD, error) GenerateEIH(CurrentIdentitySubKey []byte, nextPskHash []byte, out []byte) error GetUDPClientProcessor(ipsk [][]byte, psk []byte, derivation KeyDerivation) (UDPClientPacketProcessor, error) } type ExtensibleIdentityHeaders interface { struc.Custom } type DestinationAddress interface { net.Address } type RequestSalt interface { struc.Custom isRequestSalt() Bytes() []byte FillAllFrom(reader io.Reader) error } type TCPRequestHeader1PreSessionKey struct { Salt RequestSalt EIH ExtensibleIdentityHeaders } type TCPRequestHeader2FixedLength struct { Type byte Timestamp uint64 HeaderLength uint16 } type TCPRequestHeader3VariableLength struct { DestinationAddress DestinationAddress Contents struct { PaddingLength uint16 `struc:"sizeof=Padding"` Padding []byte } } type TCPRequestHeader struct { PreSessionKeyHeader TCPRequestHeader1PreSessionKey FixedLengthHeader TCPRequestHeader2FixedLength Header TCPRequestHeader3VariableLength } type TCPResponseHeader1PreSessionKey struct { Salt RequestSalt } type TCPResponseHeader2FixedLength struct { Type byte Timestamp uint64 RequestSalt RequestSalt InitialPayloadLength uint16 } type TCPResponseHeader struct { PreSessionKeyHeader TCPResponseHeader1PreSessionKey Header TCPResponseHeader2FixedLength } const ( TCPHeaderTypeClientToServerStream = byte(0x00) TCPHeaderTypeServerToClientStream = byte(0x01) TCPMinPaddingLength = 0 TCPMaxPaddingLength = 900 ) var addrParser = protocol.NewAddressParser( protocol.AddressFamilyByte(0x01, net.AddressFamilyIPv4), protocol.AddressFamilyByte(0x04, net.AddressFamilyIPv6), protocol.AddressFamilyByte(0x03, net.AddressFamilyDomain), ) type UDPRequest struct { SessionID [8]byte PacketID uint64 TimeStamp uint64 Address DestinationAddress Port int Payload *buf.Buffer } type UDPResponse struct { UDPRequest ClientSessionID [8]byte } const ( UDPHeaderTypeClientToServerStream = byte(0x00) UDPHeaderTypeServerToClientStream = byte(0x01) ) type UDPClientPacketProcessorCachedStateContainer interface { GetCachedState(sessionID string) UDPClientPacketProcessorCachedState PutCachedState(sessionID string, cache UDPClientPacketProcessorCachedState) GetCachedServerState(serverSessionID string) UDPClientPacketProcessorCachedState PutCachedServerState(serverSessionID string, cache UDPClientPacketProcessorCachedState) } type UDPClientPacketProcessorCachedState interface{} // UDPClientPacketProcessor // Caller retain and receive all ownership of the buffer type UDPClientPacketProcessor interface { EncodeUDPRequest(request *UDPRequest, out *buf.Buffer, cache UDPClientPacketProcessorCachedStateContainer) error DecodeUDPResp(input []byte, resp *UDPResponse, cache UDPClientPacketProcessorCachedStateContainer) error }