bfd

type AuthenticationHeader interface {
	encoding.BinaryMarshaler
	encoding.BinaryUnmarshaler

	IsValid(key []byte, packet []byte) bool
	GetAuthenticationType() AuthenticationType
}

type AuthenticationType int8

type Bool int8

type ControlPacket struct {
	Version                 int8 // version 1 by default
	DiagnosticCode          DiagnosticCode
	State                   SessionState
	Poll                    Bool // requests a Final bit packet
	Final                   Bool // required in response to poll
	ControlPlaneIndependent Bool //
	Demand                  Bool // stop sending control packets (we know we are up)
	Multipoint              Bool // needs to be zero
	DetectMultiplier        uint8
	MyDiscriminator         uint32
	YourDiscriminator       uint32
	DesiredMinTxInterval    uint32
	RequiredMinRxInterval   uint32
	RequiredMinEchoInterval uint32

	AuthenticationHeader AuthenticationHeader
}

type DiagnosticCode int8

type KeyedMD5Header struct {
	AuthType AuthenticationType
	// Length int8 = inferred
	AuthKeyId      int8
	SequenceNumber int32
	AuthKey        []byte // 16 bytes long
}

type KeyedSHA1Header struct {
	AuthType AuthenticationType
	// Length int8 = inferred
	AuthKeyId      int8
	SequenceNumber int32
	AuthKey        []byte // 20 bytes long
}

type SessionState int8

type SimplePasswordHeader struct {
	AuthKeyId int8
	Password  string // between 1 and 16 characters
}