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123 lines
2.8 KiB
123 lines
2.8 KiB
package mux
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import (
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"v2ray.com/core/common"
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"v2ray.com/core/common/bitmask"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/net"
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"v2ray.com/core/common/protocol"
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"v2ray.com/core/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.Bytes()
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common.Must2(b.WriteBytes(0x00, 0x00))
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len0 := b.Len()
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if err := b.AppendSupplier(serial.WriteUint16(f.SessionID)); err != nil {
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return err
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}
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common.Must2(b.WriteBytes(byte(f.SessionStatus), 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.Must2(b.WriteBytes(byte(TargetNetworkTCP)))
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case net.Network_UDP:
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common.Must2(b.WriteBytes(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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serial.Uint16ToBytes(uint16(len1-len0), lenBytes)
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return nil
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}
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// ReadFrameFrom reads a FrameMetadata from the given buffer.
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// Visible for testing only.
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func ReadFrameFrom(b *buf.Buffer) (*FrameMetadata, error) {
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if b.Len() < 4 {
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return nil, newError("insufficient buffer: ", b.Len())
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}
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f := &FrameMetadata{
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SessionID: serial.BytesToUint16(b.BytesTo(2)),
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SessionStatus: SessionStatus(b.Byte(2)),
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Option: bitmask.Byte(b.Byte(3)),
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}
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if f.SessionStatus == SessionStatusNew {
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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 nil, 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 nil, newError("unknown network type: ", network)
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}
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}
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return f, nil
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}
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