/*
* Create Discover Packet
*/
func (c *Client) DiscoverPacket() dhcp4.Packet {
messageid := make([]byte, 4)
if _, err := rand.Read(messageid); err != nil {
panic(err)
}
packet := dhcp4.NewPacket(dhcp4.BootRequest)
packet.SetCHAddr(c.hardwareAddr)
packet.SetXId(messageid)
packet.SetBroadcast(c.broadcast)
packet.AddOption(dhcp4.OptionDHCPMessageType, []byte{byte(dhcp4.Discover)})
//packet.PadToMinSize()
return packet
}
/*
* 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
}