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package packets
import (
"errors"
// TODO: refactor to use gopacket when gopacket folks
// will fix this > https://github.com/google/gopacket/issues/334
"github.com/mdlayher/dhcp6"
)
const DHCP6OptDNSServers = 23
const DHCP6OptDNSDomains = 24
const DHCP6OptClientFQDN = 39
// link-local
const IPv6Prefix = "fe80::"
var (
ErrNoCID = errors.New("Unexpected DHCPv6 packet, could not find client id.")
)
func DHCP6EncodeList(elements []string) (encoded []byte) {
encoded = make([]byte, 0)
for _, elem := range elements {
// this would be worth fuzzing btw
encoded = append(encoded, byte(len(elem)&0xff))
encoded = append(encoded, []byte(elem)...)
}
return
}
func DHCP6For(what dhcp6.MessageType, to dhcp6.Packet, duid []byte) (err error, p dhcp6.Packet) {
p = dhcp6.Packet{
MessageType: what,
TransactionID: to.TransactionID,
Options: make(dhcp6.Options),
}
var rawCID []byte
if raw, found := to.Options[dhcp6.OptionClientID]; !found || len(raw) < 1 {
return ErrNoCID, p
} else {
rawCID = raw[0]
}
p.Options.AddRaw(dhcp6.OptionClientID, rawCID)
p.Options.AddRaw(dhcp6.OptionServerID, duid)
return nil, p
}
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