package mux
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import (
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"encoding/binary"
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"io"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/bitmask"
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"github.com/v2fly/v2ray-core/v5/common/buf"
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"github.com/v2fly/v2ray-core/v5/common/net"
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"github.com/v2fly/v2ray-core/v5/common/protocol"
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"github.com/v2fly/v2ray-core/v5/common/serial"
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)
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type SessionStatus byte
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const (
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SessionStatusNew SessionStatus = 0x01
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SessionStatusKeep SessionStatus = 0x02
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SessionStatusEnd SessionStatus = 0x03
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SessionStatusKeepAlive SessionStatus = 0x04
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)
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const (
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OptionData bitmask.Byte = 0x01
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OptionError bitmask.Byte = 0x02
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)
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type TargetNetwork byte
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const (
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TargetNetworkTCP TargetNetwork = 0x01
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TargetNetworkUDP TargetNetwork = 0x02
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)
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var addrParser = protocol.NewAddressParser(
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protocol.AddressFamilyByte(byte(protocol.AddressTypeIPv4), net.AddressFamilyIPv4),
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protocol.AddressFamilyByte(byte(protocol.AddressTypeDomain), net.AddressFamilyDomain),
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protocol.AddressFamilyByte(byte(protocol.AddressTypeIPv6), net.AddressFamilyIPv6),
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protocol.PortThenAddress(),
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)
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/*
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Frame format
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2 bytes - length
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2 bytes - session id
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1 bytes - status
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1 bytes - option
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1 byte - network
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2 bytes - port
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n bytes - address
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*/
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type FrameMetadata struct {
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Target net.Destination
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SessionID uint16
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Option bitmask.Byte
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SessionStatus SessionStatus
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}
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func (f FrameMetadata) WriteTo(b *buf.Buffer) error {
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lenBytes := b.Extend(2)
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len0 := b.Len()
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sessionBytes := b.Extend(2)
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binary.BigEndian.PutUint16(sessionBytes, f.SessionID)
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common.Must(b.WriteByte(byte(f.SessionStatus)))
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common.Must(b.WriteByte(byte(f.Option)))
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if f.SessionStatus == SessionStatusNew {
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switch f.Target.Network {
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case net.Network_TCP:
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common.Must(b.WriteByte(byte(TargetNetworkTCP)))
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case net.Network_UDP:
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common.Must(b.WriteByte(byte(TargetNetworkUDP)))
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}
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if err := addrParser.WriteAddressPort(b, f.Target.Address, f.Target.Port); err != nil {
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return err
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}
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}
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len1 := b.Len()
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binary.BigEndian.PutUint16(lenBytes, uint16(len1-len0))
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return nil
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}
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// Unmarshal reads FrameMetadata from the given reader.
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func (f *FrameMetadata) Unmarshal(reader io.Reader) error {
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metaLen, err := serial.ReadUint16(reader)
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if err != nil {
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return err
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}
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if metaLen > 512 {
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return newError("invalid metalen ", metaLen).AtError()
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}
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b := buf.New()
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defer b.Release()
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if _, err := b.ReadFullFrom(reader, int32(metaLen)); err != nil {
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return err
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}
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return f.UnmarshalFromBuffer(b)
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}
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// UnmarshalFromBuffer reads a FrameMetadata from the given buffer.
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// Visible for testing only.
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func (f *FrameMetadata) UnmarshalFromBuffer(b *buf.Buffer) error {
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if b.Len() < 4 {
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return newError("insufficient buffer: ", b.Len())
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}
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f.SessionID = binary.BigEndian.Uint16(b.BytesTo(2))
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f.SessionStatus = SessionStatus(b.Byte(2))
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f.Option = bitmask.Byte(b.Byte(3))
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f.Target.Network = net.Network_Unknown
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if f.SessionStatus == SessionStatusNew {
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if b.Len() < 8 {
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return newError("insufficient buffer: ", b.Len())
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}
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network := TargetNetwork(b.Byte(4))
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b.Advance(5)
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addr, port, err := addrParser.ReadAddressPort(nil, b)
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if err != nil {
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return newError("failed to parse address and port").Base(err)
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}
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switch network {
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case TargetNetworkTCP:
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f.Target = net.TCPDestination(addr, port)
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case TargetNetworkUDP:
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f.Target = net.UDPDestination(addr, port)
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default:
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return newError("unknown network type: ", network)
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}
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}
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return nil
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}
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