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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
package dhcpv6
import (
"fmt"
"github.com/u-root/u-root/pkg/uio"
)
// Option is an interface that all DHCPv6 options adhere to.
type Option interface {
Code() OptionCode
ToBytes() []byte
String() string
}
type OptionGeneric struct {
OptionCode OptionCode
OptionData []byte
}
func (og *OptionGeneric) Code() OptionCode {
return og.OptionCode
}
func (og *OptionGeneric) ToBytes() []byte {
return og.OptionData
}
func (og *OptionGeneric) String() string {
return fmt.Sprintf("%s -> %v", og.OptionCode, og.OptionData)
}
// ParseOption parses data according to the given code.
func ParseOption(code OptionCode, optData []byte) (Option, error) {
// Parse a sequence of bytes as a single DHCPv6 option.
// Returns the option structure, or an error if any.
var (
err error
opt Option
)
switch code {
case OptionClientID:
opt, err = ParseOptClientId(optData)
case OptionServerID:
opt, err = ParseOptServerId(optData)
case OptionIANA:
opt, err = ParseOptIANA(optData)
case OptionIAAddr:
opt, err = ParseOptIAAddress(optData)
case OptionORO:
opt, err = ParseOptRequestedOption(optData)
case OptionElapsedTime:
opt, err = ParseOptElapsedTime(optData)
case OptionRelayMsg:
opt, err = ParseOptRelayMsg(optData)
case OptionStatusCode:
opt, err = ParseOptStatusCode(optData)
case OptionUserClass:
opt, err = ParseOptUserClass(optData)
case OptionVendorClass:
opt, err = ParseOptVendorClass(optData)
case OptionVendorOpts:
opt, err = ParseOptVendorOpts(optData)
case OptionInterfaceID:
opt, err = ParseOptInterfaceId(optData)
case OptionDNSRecursiveNameServer:
opt, err = ParseOptDNSRecursiveNameServer(optData)
case OptionDomainSearchList:
opt, err = ParseOptDomainSearchList(optData)
case OptionIAPD:
opt, err = ParseOptIAForPrefixDelegation(optData)
case OptionIAPrefix:
opt, err = ParseOptIAPrefix(optData)
case OptionRemoteID:
opt, err = ParseOptRemoteId(optData)
case OptionBootfileURL:
opt, err = ParseOptBootFileURL(optData)
case OptionBootfileParam:
opt, err = ParseOptBootFileParam(optData)
case OptionClientArchType:
opt, err = ParseOptClientArchType(optData)
case OptionNII:
opt, err = ParseOptNetworkInterfaceId(optData)
case Option4RD:
opt, err = ParseOpt4RD(optData)
case Option4RDMapRule:
opt, err = ParseOpt4RDMapRule(optData)
case Option4RDNonMapRule:
opt, err = ParseOpt4RDNonMapRule(optData)
default:
opt = &OptionGeneric{OptionCode: code, OptionData: optData}
}
if err != nil {
return nil, err
}
return opt, nil
}
// Options is a collection of options.
type Options []Option
// Get returns all options matching the option code.
func (o Options) Get(code OptionCode) []Option {
var ret []Option
for _, opt := range o {
if opt.Code() == code {
ret = append(ret, opt)
}
}
return ret
}
// GetOne returns the first option matching the option code.
func (o Options) GetOne(code OptionCode) Option {
for _, opt := range o {
if opt.Code() == code {
return opt
}
}
return nil
}
// Add appends one option.
func (o *Options) Add(option Option) {
*o = append(*o, option)
}
// Del deletes all options matching the option code.
func (o *Options) Del(code OptionCode) {
newOpts := make(Options, 0, len(*o))
for _, opt := range *o {
if opt.Code() != code {
newOpts = append(newOpts, opt)
}
}
*o = newOpts
}
// Update replaces the first option of the same type as the specified one.
func (o *Options) Update(option Option) {
for idx, opt := range *o {
if opt.Code() == option.Code() {
(*o)[idx] = option
// don't look further
return
}
}
// if not found, add it
o.Add(option)
}
// ToBytes marshals all options to bytes.
func (o Options) ToBytes() []byte {
buf := uio.NewBigEndianBuffer(nil)
for _, opt := range o {
buf.Write16(uint16(opt.Code()))
val := opt.ToBytes()
buf.Write16(uint16(len(val)))
buf.WriteBytes(val)
}
return buf.Data()
}
// FromBytes reads data into o and returns an error if the options are not a
// valid serialized representation of DHCPv6 options per RFC 3315.
func (o *Options) FromBytes(data []byte) error {
return o.FromBytesWithParser(data, ParseOption)
}
// OptionParser is a function signature for option parsing
type OptionParser func(code OptionCode, data []byte) (Option, error)
// FromBytesWithParser parses Options from byte sequences using the parsing
// function that is passed in as a paremeter
func (o *Options) FromBytesWithParser(data []byte, parser OptionParser) error {
*o = make(Options, 0, 10)
if len(data) == 0 {
// no options, no party
return nil
}
buf := uio.NewBigEndianBuffer(data)
for buf.Has(4) {
code := OptionCode(buf.Read16())
length := int(buf.Read16())
// Consume, but do not Copy. Each parser will make a copy of
// pertinent data.
optData := buf.Consume(length)
opt, err := parser(code, optData)
if err != nil {
return err
}
*o = append(*o, opt)
}
return buf.FinError()
}
|
