func (l *DHCPLease) commit(ack *dhcp4.Packet) error {
opts := ack.ParseOptions()
leaseTime, err := parseLeaseTime(opts)
if err != nil {
return err
}
rebindingTime, err := parseRebindingTime(opts)
if err != nil || rebindingTime > leaseTime {
// Per RFC 2131 Section 4.4.5, it should default to 85% of lease time
rebindingTime = leaseTime * 85 / 100
}
renewalTime, err := parseRenewalTime(opts)
if err != nil || renewalTime > rebindingTime {
// Per RFC 2131 Section 4.4.5, it should default to 50% of lease time
renewalTime = leaseTime / 2
}
now := time.Now()
l.expireTime = now.Add(leaseTime)
l.renewalTime = now.Add(renewalTime)
l.rebindingTime = now.Add(rebindingTime)
l.ack = ack
l.opts = opts
return nil
}
/*
* Create Request Packet
*/
func (c *Client) RequestPacket(offerPacket *dhcp4.Packet) dhcp4.Packet {
offerOptions := offerPacket.ParseOptions()
packet := dhcp4.NewPacket(dhcp4.BootRequest)
packet.SetCHAddr(c.hardwareAddr)
packet.SetXId(offerPacket.XId())
packet.SetCIAddr(offerPacket.CIAddr())
packet.SetSIAddr(offerPacket.SIAddr())
packet.SetBroadcast(c.broadcast)
packet.AddOption(dhcp4.OptionDHCPMessageType, []byte{byte(dhcp4.Request)})
packet.AddOption(dhcp4.OptionRequestedIPAddress, (offerPacket.YIAddr()).To4())
packet.AddOption(dhcp4.OptionServerIdentifier, offerOptions[dhcp4.OptionServerIdentifier])
//packet.PadToMinSize()
return packet
}
/*
* Create Release Packet For a Release
*/
func (c *Client) ReleasePacket(acknowledgement *dhcp4.Packet) dhcp4.Packet {
messageid := make([]byte, 4)
if _, err := rand.Read(messageid); err != nil {
panic(err)
}
acknowledgementOptions := acknowledgement.ParseOptions()
packet := dhcp4.NewPacket(dhcp4.BootRequest)
packet.SetCHAddr(acknowledgement.CHAddr())
packet.SetXId(messageid)
packet.SetCIAddr(acknowledgement.YIAddr())
packet.AddOption(dhcp4.OptionDHCPMessageType, []byte{byte(dhcp4.Release)})
packet.AddOption(dhcp4.OptionServerIdentifier, acknowledgementOptions[dhcp4.OptionServerIdentifier])
//packet.PadToMinSize()
return packet
}