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
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
|
package dhcpv4
import (
"fmt"
"github.com/u-root/uio/uio"
)
// values from http://www.networksorcery.com/enp/protocol/dhcp.htm and
// http://www.networksorcery.com/enp/protocol/bootp/options.htm
// TransactionID represents a 4-byte DHCP transaction ID as defined in RFC 951,
// Section 3.
//
// The TransactionID is used to match DHCP replies to their original request.
type TransactionID [4]byte
// String prints a hex transaction ID.
func (xid TransactionID) String() string {
return fmt.Sprintf("0x%x", xid[:])
}
// MessageType represents the possible DHCP message types - DISCOVER, OFFER, etc
type MessageType byte
// DHCP message types
const (
// MessageTypeNone is not a real message type, it is used by certain
// functions to signal that no explicit message type is requested
MessageTypeNone MessageType = 0
MessageTypeDiscover MessageType = 1
MessageTypeOffer MessageType = 2
MessageTypeRequest MessageType = 3
MessageTypeDecline MessageType = 4
MessageTypeAck MessageType = 5
MessageTypeNak MessageType = 6
MessageTypeRelease MessageType = 7
MessageTypeInform MessageType = 8
)
// ToBytes returns the serialized version of this option described by RFC 2132,
// Section 9.6.
func (m MessageType) ToBytes() []byte {
return []byte{byte(m)}
}
// String prints a human-readable message type name.
func (m MessageType) String() string {
if s, ok := messageTypeToString[m]; ok {
return s
}
return fmt.Sprintf("unknown (%d)", byte(m))
}
// FromBytes reads a message type from data as described by RFC 2132, Section
// 9.6.
func (m *MessageType) FromBytes(data []byte) error {
buf := uio.NewBigEndianBuffer(data)
*m = MessageType(buf.Read8())
return buf.FinError()
}
var messageTypeToString = map[MessageType]string{
MessageTypeDiscover: "DISCOVER",
MessageTypeOffer: "OFFER",
MessageTypeRequest: "REQUEST",
MessageTypeDecline: "DECLINE",
MessageTypeAck: "ACK",
MessageTypeNak: "NAK",
MessageTypeRelease: "RELEASE",
MessageTypeInform: "INFORM",
}
// OpcodeType represents a DHCPv4 opcode.
type OpcodeType uint8
// constants that represent valid values for OpcodeType
const (
OpcodeBootRequest OpcodeType = 1
OpcodeBootReply OpcodeType = 2
)
func (o OpcodeType) String() string {
if s, ok := opcodeToString[o]; ok {
return s
}
return fmt.Sprintf("unknown (%d)", uint8(o))
}
var opcodeToString = map[OpcodeType]string{
OpcodeBootRequest: "BootRequest",
OpcodeBootReply: "BootReply",
}
// OptionCode is a single byte representing the code for a given Option.
//
// OptionCode is an interface purely to support different stringers on options
// with the same Code value, as vendor-specific options use option codes that
// have the same value, but mean a different thing.
type OptionCode interface {
// Code is the 1 byte option code for the wire.
Code() uint8
// String returns the option's name.
String() string
}
// optionCode is a DHCP option code.
type optionCode uint8
// Code implements OptionCode.Code.
func (o optionCode) Code() uint8 {
return uint8(o)
}
// String returns an option name.
func (o optionCode) String() string {
if s, ok := optionCodeToString[o]; ok {
return s
}
return fmt.Sprintf("unknown (%d)", uint8(o))
}
// GenericOptionCode is an unnamed option code.
type GenericOptionCode uint8
// Code implements OptionCode.Code.
func (o GenericOptionCode) Code() uint8 {
return uint8(o)
}
// String returns the option's name.
func (o GenericOptionCode) String() string {
return fmt.Sprintf("unknown (%d)", uint8(o))
}
// DHCPv4 Options
const (
OptionPad optionCode = 0
OptionSubnetMask optionCode = 1
OptionTimeOffset optionCode = 2
OptionRouter optionCode = 3
OptionTimeServer optionCode = 4
OptionNameServer optionCode = 5
OptionDomainNameServer optionCode = 6
OptionLogServer optionCode = 7
OptionQuoteServer optionCode = 8
OptionLPRServer optionCode = 9
OptionImpressServer optionCode = 10
OptionResourceLocationServer optionCode = 11
OptionHostName optionCode = 12
OptionBootFileSize optionCode = 13
OptionMeritDumpFile optionCode = 14
OptionDomainName optionCode = 15
OptionSwapServer optionCode = 16
OptionRootPath optionCode = 17
OptionExtensionsPath optionCode = 18
OptionIPForwarding optionCode = 19
OptionNonLocalSourceRouting optionCode = 20
OptionPolicyFilter optionCode = 21
OptionMaximumDatagramAssemblySize optionCode = 22
OptionDefaultIPTTL optionCode = 23
OptionPathMTUAgingTimeout optionCode = 24
OptionPathMTUPlateauTable optionCode = 25
OptionInterfaceMTU optionCode = 26
OptionAllSubnetsAreLocal optionCode = 27
OptionBroadcastAddress optionCode = 28
OptionPerformMaskDiscovery optionCode = 29
OptionMaskSupplier optionCode = 30
OptionPerformRouterDiscovery optionCode = 31
OptionRouterSolicitationAddress optionCode = 32
OptionStaticRoutingTable optionCode = 33
OptionTrailerEncapsulation optionCode = 34
OptionArpCacheTimeout optionCode = 35
OptionEthernetEncapsulation optionCode = 36
OptionDefaulTCPTTL optionCode = 37
OptionTCPKeepaliveInterval optionCode = 38
OptionTCPKeepaliveGarbage optionCode = 39
OptionNetworkInformationServiceDomain optionCode = 40
OptionNetworkInformationServers optionCode = 41
OptionNTPServers optionCode = 42
OptionVendorSpecificInformation optionCode = 43
OptionNetBIOSOverTCPIPNameServer optionCode = 44
OptionNetBIOSOverTCPIPDatagramDistributionServer optionCode = 45
OptionNetBIOSOverTCPIPNodeType optionCode = 46
OptionNetBIOSOverTCPIPScope optionCode = 47
OptionXWindowSystemFontServer optionCode = 48
OptionXWindowSystemDisplayManger optionCode = 49
OptionRequestedIPAddress optionCode = 50
OptionIPAddressLeaseTime optionCode = 51
OptionOptionOverload optionCode = 52
OptionDHCPMessageType optionCode = 53
OptionServerIdentifier optionCode = 54
OptionParameterRequestList optionCode = 55
OptionMessage optionCode = 56
OptionMaximumDHCPMessageSize optionCode = 57
OptionRenewTimeValue optionCode = 58
OptionRebindingTimeValue optionCode = 59
OptionClassIdentifier optionCode = 60
OptionClientIdentifier optionCode = 61
OptionNetWareIPDomainName optionCode = 62
OptionNetWareIPInformation optionCode = 63
OptionNetworkInformationServicePlusDomain optionCode = 64
OptionNetworkInformationServicePlusServers optionCode = 65
OptionTFTPServerName optionCode = 66
OptionBootfileName optionCode = 67
OptionMobileIPHomeAgent optionCode = 68
OptionSimpleMailTransportProtocolServer optionCode = 69
OptionPostOfficeProtocolServer optionCode = 70
OptionNetworkNewsTransportProtocolServer optionCode = 71
OptionDefaultWorldWideWebServer optionCode = 72
OptionDefaultFingerServer optionCode = 73
OptionDefaultInternetRelayChatServer optionCode = 74
OptionStreetTalkServer optionCode = 75
OptionStreetTalkDirectoryAssistanceServer optionCode = 76
OptionUserClassInformation optionCode = 77
OptionSLPDirectoryAgent optionCode = 78
OptionSLPServiceScope optionCode = 79
OptionRapidCommit optionCode = 80
OptionFQDN optionCode = 81
OptionRelayAgentInformation optionCode = 82
OptionInternetStorageNameService optionCode = 83
// Option 84 returned in RFC 3679
OptionNDSServers optionCode = 85
OptionNDSTreeName optionCode = 86
OptionNDSContext optionCode = 87
OptionBCMCSControllerDomainNameList optionCode = 88
OptionBCMCSControllerIPv4AddressList optionCode = 89
OptionAuthentication optionCode = 90
OptionClientLastTransactionTime optionCode = 91
OptionAssociatedIP optionCode = 92
OptionClientSystemArchitectureType optionCode = 93
OptionClientNetworkInterfaceIdentifier optionCode = 94
OptionLDAP optionCode = 95
// Option 96 returned in RFC 3679
OptionClientMachineIdentifier optionCode = 97
OptionOpenGroupUserAuthentication optionCode = 98
OptionGeoConfCivic optionCode = 99
OptionIEEE10031TZString optionCode = 100
OptionReferenceToTZDatabase optionCode = 101
// Options 102-111 returned in RFC 3679
OptionNetInfoParentServerAddress optionCode = 112
OptionNetInfoParentServerTag optionCode = 113
OptionURL optionCode = 114
// Option 115 returned in RFC 3679
OptionAutoConfigure optionCode = 116
OptionNameServiceSearch optionCode = 117
OptionSubnetSelection optionCode = 118
OptionDNSDomainSearchList optionCode = 119
OptionSIPServers optionCode = 120
OptionClasslessStaticRoute optionCode = 121
OptionCCC optionCode = 122
OptionGeoConf optionCode = 123
OptionVendorIdentifyingVendorClass optionCode = 124
OptionVendorIdentifyingVendorSpecific optionCode = 125
// Options 126-127 returned in RFC 3679
OptionTFTPServerIPAddress optionCode = 128
OptionCallServerIPAddress optionCode = 129
OptionDiscriminationString optionCode = 130
OptionRemoteStatisticsServerIPAddress optionCode = 131
Option8021PVLANID optionCode = 132
Option8021QL2Priority optionCode = 133
OptionDiffservCodePoint optionCode = 134
OptionHTTPProxyForPhoneSpecificApplications optionCode = 135
OptionPANAAuthenticationAgent optionCode = 136
OptionLoSTServer optionCode = 137
OptionCAPWAPAccessControllerAddresses optionCode = 138
OptionOPTIONIPv4AddressMoS optionCode = 139
OptionOPTIONIPv4FQDNMoS optionCode = 140
OptionSIPUAConfigurationServiceDomains optionCode = 141
OptionOPTIONIPv4AddressANDSF optionCode = 142
OptionOPTIONIPv6AddressANDSF optionCode = 143
// Options 144-149 returned in RFC 3679
OptionTFTPServerAddress optionCode = 150
OptionStatusCode optionCode = 151
OptionBaseTime optionCode = 152
OptionStartTimeOfState optionCode = 153
OptionQueryStartTime optionCode = 154
OptionQueryEndTime optionCode = 155
OptionDHCPState optionCode = 156
OptionDataSource optionCode = 157
// Options 158-174 returned in RFC 3679
OptionEtherboot optionCode = 175
OptionIPTelephone optionCode = 176
OptionEtherbootPacketCableAndCableHome optionCode = 177
// Options 178-207 returned in RFC 3679
OptionPXELinuxMagicString optionCode = 208
OptionPXELinuxConfigFile optionCode = 209
OptionPXELinuxPathPrefix optionCode = 210
OptionPXELinuxRebootTime optionCode = 211
OptionOPTION6RD optionCode = 212
OptionOPTIONv4AccessDomain optionCode = 213
// Options 214-219 returned in RFC 3679
OptionSubnetAllocation optionCode = 220
OptionVirtualSubnetAllocation optionCode = 221
// Options 222-223 returned in RFC 3679
// Options 224-254 are reserved for private use
OptionEnd optionCode = 255
)
var optionCodeToString = map[OptionCode]string{
OptionPad: "Pad",
OptionSubnetMask: "Subnet Mask",
OptionTimeOffset: "Time Offset",
OptionRouter: "Router",
OptionTimeServer: "Time Server",
OptionNameServer: "Name Server",
OptionDomainNameServer: "Domain Name Server",
OptionLogServer: "Log Server",
OptionQuoteServer: "Quote Server",
OptionLPRServer: "LPR Server",
OptionImpressServer: "Impress Server",
OptionResourceLocationServer: "Resource Location Server",
OptionHostName: "Host Name",
OptionBootFileSize: "Boot File Size",
OptionMeritDumpFile: "Merit Dump File",
OptionDomainName: "Domain Name",
OptionSwapServer: "Swap Server",
OptionRootPath: "Root Path",
OptionExtensionsPath: "Extensions Path",
OptionIPForwarding: "IP Forwarding enable/disable",
OptionNonLocalSourceRouting: "Non-local Source Routing enable/disable",
OptionPolicyFilter: "Policy Filter",
OptionMaximumDatagramAssemblySize: "Maximum Datagram Reassembly Size",
OptionDefaultIPTTL: "Default IP Time-to-live",
OptionPathMTUAgingTimeout: "Path MTU Aging Timeout",
OptionPathMTUPlateauTable: "Path MTU Plateau Table",
OptionInterfaceMTU: "Interface MTU",
OptionAllSubnetsAreLocal: "All Subnets Are Local",
OptionBroadcastAddress: "Broadcast Address",
OptionPerformMaskDiscovery: "Perform Mask Discovery",
OptionMaskSupplier: "Mask Supplier",
OptionPerformRouterDiscovery: "Perform Router Discovery",
OptionRouterSolicitationAddress: "Router Solicitation Address",
OptionStaticRoutingTable: "Static Routing Table",
OptionTrailerEncapsulation: "Trailer Encapsulation",
OptionArpCacheTimeout: "ARP Cache Timeout",
OptionEthernetEncapsulation: "Ethernet Encapsulation",
OptionDefaulTCPTTL: "Default TCP TTL",
OptionTCPKeepaliveInterval: "TCP Keepalive Interval",
OptionTCPKeepaliveGarbage: "TCP Keepalive Garbage",
OptionNetworkInformationServiceDomain: "Network Information Service Domain",
OptionNetworkInformationServers: "Network Information Servers",
OptionNTPServers: "NTP Servers",
OptionVendorSpecificInformation: "Vendor Specific Information",
OptionNetBIOSOverTCPIPNameServer: "NetBIOS over TCP/IP Name Server",
OptionNetBIOSOverTCPIPDatagramDistributionServer: "NetBIOS over TCP/IP Datagram Distribution Server",
OptionNetBIOSOverTCPIPNodeType: "NetBIOS over TCP/IP Node Type",
OptionNetBIOSOverTCPIPScope: "NetBIOS over TCP/IP Scope",
OptionXWindowSystemFontServer: "X Window System Font Server",
OptionXWindowSystemDisplayManger: "X Window System Display Manager",
OptionRequestedIPAddress: "Requested IP Address",
OptionIPAddressLeaseTime: "IP Addresses Lease Time",
OptionOptionOverload: "Option Overload",
OptionDHCPMessageType: "DHCP Message Type",
OptionServerIdentifier: "Server Identifier",
OptionParameterRequestList: "Parameter Request List",
OptionMessage: "Message",
OptionMaximumDHCPMessageSize: "Maximum DHCP Message Size",
OptionRenewTimeValue: "Renew Time Value",
OptionRebindingTimeValue: "Rebinding Time Value",
OptionClassIdentifier: "Class Identifier",
OptionClientIdentifier: "Client identifier",
OptionNetWareIPDomainName: "NetWare/IP Domain Name",
OptionNetWareIPInformation: "NetWare/IP Information",
OptionNetworkInformationServicePlusDomain: "Network Information Service+ Domain",
OptionNetworkInformationServicePlusServers: "Network Information Service+ Servers",
OptionTFTPServerName: "TFTP Server Name",
OptionBootfileName: "Bootfile Name",
OptionMobileIPHomeAgent: "Mobile IP Home Agent",
OptionSimpleMailTransportProtocolServer: "SMTP Server",
OptionPostOfficeProtocolServer: "POP Server",
OptionNetworkNewsTransportProtocolServer: "NNTP Server",
OptionDefaultWorldWideWebServer: "Default WWW Server",
OptionDefaultFingerServer: "Default Finger Server",
OptionDefaultInternetRelayChatServer: "Default IRC Server",
OptionStreetTalkServer: "StreetTalk Server",
OptionStreetTalkDirectoryAssistanceServer: "StreetTalk Directory Assistance Server",
OptionUserClassInformation: "User Class Information",
OptionSLPDirectoryAgent: "SLP DIrectory Agent",
OptionSLPServiceScope: "SLP Service Scope",
OptionRapidCommit: "Rapid Commit",
OptionFQDN: "FQDN",
OptionRelayAgentInformation: "Relay Agent Information",
OptionInternetStorageNameService: "Internet Storage Name Service",
// Option 84 returned in RFC 3679
OptionNDSServers: "NDS Servers",
OptionNDSTreeName: "NDS Tree Name",
OptionNDSContext: "NDS Context",
OptionBCMCSControllerDomainNameList: "BCMCS Controller Domain Name List",
OptionBCMCSControllerIPv4AddressList: "BCMCS Controller IPv4 Address List",
OptionAuthentication: "Authentication",
OptionClientLastTransactionTime: "Client Last Transaction Time",
OptionAssociatedIP: "Associated IP",
OptionClientSystemArchitectureType: "Client System Architecture Type",
OptionClientNetworkInterfaceIdentifier: "Client Network Interface Identifier",
OptionLDAP: "LDAP",
// Option 96 returned in RFC 3679
OptionClientMachineIdentifier: "Client Machine Identifier",
OptionOpenGroupUserAuthentication: "OpenGroup's User Authentication",
OptionGeoConfCivic: "GEOCONF_CIVIC",
OptionIEEE10031TZString: "IEEE 1003.1 TZ String",
OptionReferenceToTZDatabase: "Reference to the TZ Database",
// Options 102-111 returned in RFC 3679
OptionNetInfoParentServerAddress: "NetInfo Parent Server Address",
OptionNetInfoParentServerTag: "NetInfo Parent Server Tag",
OptionURL: "URL",
// Option 115 returned in RFC 3679
OptionAutoConfigure: "Auto-Configure",
OptionNameServiceSearch: "Name Service Search",
OptionSubnetSelection: "Subnet Selection",
OptionDNSDomainSearchList: "DNS Domain Search List",
OptionSIPServers: "SIP Servers",
OptionClasslessStaticRoute: "Classless Static Route",
OptionCCC: "CCC, CableLabs Client Configuration",
OptionGeoConf: "GeoConf",
OptionVendorIdentifyingVendorClass: "Vendor-Identifying Vendor Class",
OptionVendorIdentifyingVendorSpecific: "Vendor-Identifying Vendor-Specific",
// Options 126-127 returned in RFC 3679
OptionTFTPServerIPAddress: "TFTP Server IP Address",
OptionCallServerIPAddress: "Call Server IP Address",
OptionDiscriminationString: "Discrimination String",
OptionRemoteStatisticsServerIPAddress: "RemoteStatistics Server IP Address",
Option8021PVLANID: "802.1P VLAN ID",
Option8021QL2Priority: "802.1Q L2 Priority",
OptionDiffservCodePoint: "Diffserv Code Point",
OptionHTTPProxyForPhoneSpecificApplications: "HTTP Proxy for phone-specific applications",
OptionPANAAuthenticationAgent: "PANA Authentication Agent",
OptionLoSTServer: "LoST Server",
OptionCAPWAPAccessControllerAddresses: "CAPWAP Access Controller Addresses",
OptionOPTIONIPv4AddressMoS: "OPTION-IPv4_Address-MoS",
OptionOPTIONIPv4FQDNMoS: "OPTION-IPv4_FQDN-MoS",
OptionSIPUAConfigurationServiceDomains: "SIP UA Configuration Service Domains",
OptionOPTIONIPv4AddressANDSF: "OPTION-IPv4_Address-ANDSF",
OptionOPTIONIPv6AddressANDSF: "OPTION-IPv6_Address-ANDSF",
// Options 144-149 returned in RFC 3679
OptionTFTPServerAddress: "TFTP Server Address",
OptionStatusCode: "Status Code",
OptionBaseTime: "Base Time",
OptionStartTimeOfState: "Start Time of State",
OptionQueryStartTime: "Query Start Time",
OptionQueryEndTime: "Query End Time",
OptionDHCPState: "DHCP Staet",
OptionDataSource: "Data Source",
// Options 158-174 returned in RFC 3679
OptionEtherboot: "Etherboot",
OptionIPTelephone: "IP Telephone",
OptionEtherbootPacketCableAndCableHome: "Etherboot / PacketCable and CableHome",
// Options 178-207 returned in RFC 3679
OptionPXELinuxMagicString: "PXELinux Magic String",
OptionPXELinuxConfigFile: "PXELinux Config File",
OptionPXELinuxPathPrefix: "PXELinux Path Prefix",
OptionPXELinuxRebootTime: "PXELinux Reboot Time",
OptionOPTION6RD: "OPTION_6RD",
OptionOPTIONv4AccessDomain: "OPTION_V4_ACCESS_DOMAIN",
// Options 214-219 returned in RFC 3679
OptionSubnetAllocation: "Subnet Allocation",
OptionVirtualSubnetAllocation: "Virtual Subnet Selection",
// Options 222-223 returned in RFC 3679
// Options 224-254 are reserved for private use
OptionEnd: "End",
}
|
