1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
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) MessageType() MessageType {
return r.messageType
}
func (r *DHCPv6Relay) SetMessageType(messageType MessageType) {
// not enforcing if message type is not a RELAY_FORW or a RELAY_REPL message
r.messageType = messageType
}
func (r *DHCPv6Relay) HopCount() uint8 {
return r.hopCount
}
func (r *DHCPv6Relay) SetHopCount(hopCount uint8) {
r.hopCount = hopCount
}
func (r *DHCPv6Relay) LinkAddr() net.IP {
return r.linkAddr
}
func (r *DHCPv6Relay) SetLinkAddr(linkAddr net.IP) {
r.linkAddr = linkAddr
}
func (r *DHCPv6Relay) PeerAddr() net.IP {
return r.peerAddr
}
func (r *DHCPv6Relay) SetPeerAddr(peerAddr net.IP) {
r.peerAddr = peerAddr
}
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) SetOptions(options []Option) {
r.options = options
}
func (r *DHCPv6Relay) AddOption(option Option) {
r.options = append(r.options, option)
}
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
err error
)
p = d
for {
if !p.IsRelay() {
return p, nil
}
p, err = DecapsulateRelay(p)
if err != nil {
return nil, err
}
}
}
|
