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|
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
// Option 108 returned in RFC 8925
OptionIPv6OnlyPreferred optionCode = 108
// 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",
// Option 108 returned in RFC 8925
OptionIPv6OnlyPreferred: "IPv6-Only Preferred",
// 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",
}
|
