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package packet
import (
"bytes"
"fmt"
"github.com/bio-routing/bio-rd/util/decoder"
)
const (
OpenMsgMinLen = 10
)
// PeerUpNotification represents a peer up notification
type PeerUpNotification struct {
CommonHeader *CommonHeader
LocalAddress [16]byte
LocalPort uint16
RemotePort uint16
SentOpenMsg []byte
ReceivedOpenMsg []byte
Information []byte
}
// MsgType returns the type of this message
func (p *PeerUpNotification) MsgType() uint8 {
return p.CommonHeader.MsgType
}
func decodePeerUpNotification(buf *bytes.Buffer, ch *CommonHeader) (*PeerUpNotification, error) {
p := &PeerUpNotification{}
fields := []interface{}{
&p.LocalAddress,
&p.LocalPort,
&p.RemotePort,
}
err := decoder.Decode(buf, fields)
if err != nil {
return nil, err
}
sentOpenMsg, err := getOpenMsg(buf)
if err != nil {
return nil, fmt.Errorf("Unable to get OPEN message: %v", err)
}
p.SentOpenMsg = sentOpenMsg
recvOpenMsg, err := getOpenMsg(buf)
if err != nil {
return nil, fmt.Errorf("Unable to get OPEN message: %v", err)
}
p.ReceivedOpenMsg = recvOpenMsg
if buf.Len() == 0 {
return p, nil
}
p.Information = make([]byte, buf.Len())
fields = []interface{}{
&p.Information,
}
err = decoder.Decode(buf, fields)
if err != nil {
return nil, err
}
fmt.Printf("%v\n", p.Information)
return p, nil
}
func getOpenMsg(buf *bytes.Buffer) ([]byte, error) {
msg := make([]byte, OpenMsgMinLen)
_, err := buf.Read(msg)
if err != nil {
return nil, fmt.Errorf("Unable to read: %v", err)
}
if msg[OpenMsgMinLen-1] == 0 {
return msg, nil
}
optParams := make([]byte, msg[OpenMsgMinLen-1])
_, err = buf.Read(optParams)
if err != nil {
return nil, fmt.Errorf("Unable to read: %v", err)
}
msg = append(msg, optParams...)
return msg, nil
}