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|
package dhcpv6
import (
"fmt"
"net"
)
const RelayHeaderSize = 34
type DHCPv6Relay struct {
messageType MessageType
hopCount uint8
linkAddr net.IP
peerAddr net.IP
options []Option
}
func (r *DHCPv6Relay) Type() MessageType {
return r.messageType
}
func (r *DHCPv6Relay) MessageTypeToString() string {
return MessageTypeToString(r.messageType)
}
func (r *DHCPv6Relay) String() string {
ret := fmt.Sprintf(
"DHCPv6Relay(messageType=%v hopcount=%v, linkaddr=%v, peeraddr=%v, %d options)",
r.MessageTypeToString(), r.hopCount, r.linkAddr, r.peerAddr, len(r.options),
)
return ret
}
func (r *DHCPv6Relay) Summary() string {
ret := fmt.Sprintf(
"DHCPv6Relay\n"+
" messageType=%v\n"+
" hopcount=%v\n"+
" linkaddr=%v\n"+
" peeraddr=%v\n"+
" options=%v\n",
r.MessageTypeToString(),
r.hopCount,
r.linkAddr,
r.peerAddr,
r.options,
)
return ret
}
func (r *DHCPv6Relay) ToBytes() []byte {
ret := make([]byte, RelayHeaderSize)
ret[0] = byte(r.messageType)
ret[1] = byte(r.hopCount)
copy(ret[2:18], r.peerAddr)
copy(ret[18:34], r.linkAddr)
for _, opt := range r.options {
ret = append(ret, opt.ToBytes()...)
}
return ret
}
func (r *DHCPv6Relay) Length() int {
mLen := RelayHeaderSize
for _, opt := range r.options {
mLen += opt.Length() + 4 // +4 for opt code and opt len
}
return mLen
}
func (r *DHCPv6Relay) Options() []Option {
return r.options
}
func (r *DHCPv6Relay) GetOption(code OptionCode) []Option {
return getOptions(r.options, code, false)
}
func (r *DHCPv6Relay) GetOneOption(code OptionCode) Option {
return getOption(r.options, code)
}
func (r *DHCPv6Relay) IsRelay() bool {
return true
}
// Recurse into a relay message and extract and return the inner DHCPv6Message.
// Return nil if none found (e.g. not a relay message).
func (d *DHCPv6Relay) GetInnerMessage() (DHCPv6, error) {
var p DHCPv6
p = d
for {
if !p.IsRelay() {
return p, nil
}
opt := p.GetOneOption(OPTION_RELAY_MSG)
if opt == nil {
return nil, fmt.Errorf("No OptRelayMsg found")
}
relayOpt := opt.(*OptRelayMsg)
if relayOpt.RelayMessage() == nil {
return nil, fmt.Errorf("Relay message cannot be nil")
}
p = relayOpt.RelayMessage()
}
}
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