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restructure package, rename module/repo
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soypat
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package dhcpv4
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import (
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"errors"
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)
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//go:generate stringer -type=OptNum,Op,MessageType,ClientState -linecomment -output stringers.go
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// ClientState transition table during request:
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//
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// StateInit -> | Send out Discover | -> StateSelecting
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// StateSelecting -> |Accept Offer+Request| -> StateRequesting
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// StateRequesting-> | Receive Ack | -> StateBound
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type ClientState uint8
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const (
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_ ClientState = iota
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// On clean slate boot, abort, NAK or decline enter the INIT state.
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StateInit // init
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// After sending out a Discover enter SELECTING.
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StateSelecting // selecting
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// After receiving a worthy offer and sending out request for offer enter REQUESTING.
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StateRequesting // requesting
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// On ACK to Request enter BOUND.
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StateBound // bound
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StateRenewing // renewing
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StateRebinding // rebinding
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StateInitReboot // init-reboot
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StateRebooting // rebooting
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)
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func AppendOption(dst []byte, opt OptNum, data ...byte) []byte {
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if len(data) > 255 {
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panic("option data too long")
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}
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dst = append(dst, byte(opt), byte(len(data)))
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dst = append(dst, data...)
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return dst
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}
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func EncodeOption(dst []byte, opt OptNum, data ...byte) (int, error) {
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if len(data) > 255 {
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return 0, errors.New("DHCPv4 option data too long (>255)")
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} else if len(dst) < 2+len(data) {
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return 0, errors.New("DHCP option buffer too short")
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}
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_ = dst[2+len(data)]
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dst[0] = byte(opt)
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dst[1] = byte(len(data))
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copy(dst[2:], data)
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return 2 + len(data), nil
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}
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type OptNum uint8
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// DHCP options. Taken from https://help.sonicwall.com/help/sw/eng/6800/26/2/3/content/Network_DHCP_Server.042.12.htm.
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const (
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OptWordAligned OptNum = 0 // word-aligned
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OptSubnetMask OptNum = 1 // subnet mask
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OptTimeOffset OptNum = 2 // Time offset in seconds from UTC
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OptRouter OptNum = 3 // N/4 router addresses
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OptTimeServers OptNum = 4 // N/4 time server addresses
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OptNameServers OptNum = 5 // N/4 IEN-116 server addresses
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OptDNSServers OptNum = 6 // N/4 DNS server addresses
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OptLogServers OptNum = 7 // N/4 logging server addresses
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OptCookieServers OptNum = 8 // N/4 quote server addresses
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OptLPRServers OptNum = 9 // N/4 printer server addresses
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OptImpressServers OptNum = 10 // N/4 impress server addresses
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OptRLPServers OptNum = 11 // N/4 RLP server addresses
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OptHostName OptNum = 12 // Hostname string
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OptBootFileSize OptNum = 13 // Size of boot file in 512 byte chunks
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OptMeritDumpFile OptNum = 14 // Client to dump and name of file to dump to
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OptDomainName OptNum = 15 // The DNS domain name of the client
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OptSwapServer OptNum = 16 // Swap server addresses
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OptRootPath OptNum = 17 // Path name for root disk
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OptExtensionFile OptNum = 18 // Patch name for more BOOTP info
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OptIPLayerForwarding OptNum = 19 // Enable or disable IP forwarding
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OptSrcrouteenabler OptNum = 20 // Enable or disable source routing
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OptPolicyFilter OptNum = 21 // Routing policy filters
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OptMaximumDGReassemblySize OptNum = 22 // Maximum datagram reassembly size
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OptDefaultIPTTL OptNum = 23 // Default IP time-to-live
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OptPathMTUAgingTimeout OptNum = 24 // Path MTU aging timeout
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OptMTUPlateau OptNum = 25 // Path MTU plateau table
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OptInterfaceMTUSize OptNum = 26 // Interface MTU size
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OptAllSubnetsAreLocal OptNum = 27 // All subnets are local
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OptBroadcastAddress OptNum = 28 // Broadcast address
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OptPerformMaskDiscovery OptNum = 29 // Perform mask discovery
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OptProvideMasktoOthers OptNum = 30 // Provide mask to others
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OptPerformRouterDiscovery OptNum = 31 // Perform router discovery
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OptRouterSolicitationAddress OptNum = 32 // Router solicitation address
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OptStaticRoutingTable OptNum = 33 // Static routing table
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OptTrailerEncapsulation OptNum = 34 // Trailer encapsulation
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OptARPCacheTimeout OptNum = 35 // ARP cache timeout
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OptEthernetEncapsulation OptNum = 36 // Ethernet encapsulation
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OptDefaultTCPTimetoLive OptNum = 37 // Default TCP time to live
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OptTCPKeepaliveInterval OptNum = 38 // TCP keepalive interval
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OptTCPKeepaliveGarbage OptNum = 39 // TCP keepalive garbage
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OptNISDomainName OptNum = 40 // NIS domain name
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OptNISServerAddresses OptNum = 41 // NIS server addresses
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OptNTPServersAddresses OptNum = 42 // NTP servers addresses
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OptVendorSpecificInformation OptNum = 43 // Vendor specific information
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OptNetBIOSNameServer OptNum = 44 // NetBIOS name server
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OptNetBIOSDatagramDistribution OptNum = 45 // NetBIOS datagram distribution
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OptNetBIOSNodeType OptNum = 46 // NetBIOS node type
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OptNetBIOSScope OptNum = 47 // NetBIOS scope
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OptXWindowFontServer OptNum = 48 // X window font server
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OptXWindowDisplayManager OptNum = 49 // X window display manager
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OptRequestedIPaddress OptNum = 50 // Requested IP address
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OptIPAddressLeaseTime OptNum = 51 // IP address lease time
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OptOptionOverload OptNum = 52 // Overload “sname” or “file”
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OptMessageType OptNum = 53 // DHCP message type.
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OptServerIdentification OptNum = 54 // DHCP server identification
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OptParameterRequestList OptNum = 55 // Parameter request list
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OptMessage OptNum = 56 // DHCP error message
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OptMaximumMessageSize OptNum = 57 // DHCP maximum message size
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OptRenewTimeValue OptNum = 58 // DHCP renewal (T1) time
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OptRebindingTimeValue OptNum = 59 // DHCP rebinding (T2) time
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OptClientIdentifier OptNum = 60 // Client identifier
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OptClientIdentifier1 OptNum = 61 // Client identifier(1)
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)
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type Op byte
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const (
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opUndefined Op = iota // undefined
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OpRequest // request
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OpReply // reply
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)
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type MessageType uint8
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const (
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msg MessageType = iota // undefined
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MsgDiscover // discover
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MsgOffer // offer
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MsgRequest // request
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MsgDecline // decline
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MsgAck // ack
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MsgNack // nak
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MsgRelease // release
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MsgInform // inform
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)
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type Flags uint16
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