mirror of
https://github.com/danderson/netboot.git
synced 2025-08-09 16:17:11 +02:00
217 lines
8.0 KiB
Go
217 lines
8.0 KiB
Go
package dhcp6
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import (
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"fmt"
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"net"
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"encoding/binary"
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"bytes"
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)
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type MessageType uint8
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const (
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MsgSolicit MessageType = iota + 1
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MsgAdvertise
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MsgRequest
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MsgConfirm
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MsgRenew
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MsgRebind
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MsgReply
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MsgRelease
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MsgDecline
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MsgReconfigure
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MsgInformationRequest
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MsgRelayForw
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MsgRelayRepl
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)
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type Packet struct {
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Type MessageType
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TransactionID [3]byte
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Options []byte
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}
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func MakePacket(bs []byte, len int) *Packet {
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ret := &Packet{Type: MessageType(bs[0]), Options: make([]byte, len - 4)}
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copy(ret.TransactionID[:], bs[1:4])
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copy(ret.Options[:], bs[4:len])
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return ret
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}
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func (p *Packet) UnmarshalOptions() (Options, error) {
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ret, err := MakeOptions(p.Options)
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if err != nil {
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return nil, fmt.Errorf("packet has malformed options section: %s", err)
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}
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return ret, nil
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}
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func (p *Packet) BuildResponse(serverDuid []byte) ([]byte, error) {
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switch p.Type {
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case MsgSolicit:
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return p.BuildMsgAdvertise(serverDuid)
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case MsgRequest:
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return p.BuildMsgReply(serverDuid)
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case MsgInformationRequest:
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return p.BuildMsgInformationRequestReply(serverDuid)
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case MsgRelease:
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return p.BuildMsgReleaseReply(serverDuid)
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default:
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return nil, nil
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}
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}
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func (p *Packet) BuildMsgAdvertise(serverDuid []byte) ([]byte, error) {
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in_options, _ := p.UnmarshalOptions()
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ret_options := make(Options)
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ret_options.AddOption(&Option{Id: OptClientId, Length: uint16(len(in_options[OptClientId].Value)), Value: in_options[OptClientId].Value})
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ret_options.AddOption(MakeIaNaOption(in_options[OptIaNa].Value[0:4], 0, 0,
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MakeIaAddrOption(net.ParseIP("2001:db8:f00f:cafe::99"), 27000, 43200)))
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ret_options.AddOption(&Option{Id: OptServerId, Length: uint16(len(serverDuid)), Value: serverDuid})
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if 0x10 == binary.BigEndian.Uint16(in_options[OptClientArchType].Value) { // HTTPClient
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ret_options.AddOption(&Option{Id: OptVendorClass, Length: 16, Value: []byte {0, 0, 0, 0, 0, 10, 72, 84, 84, 80, 67, 108, 105, 101, 110, 116}}) // HTTPClient
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ret_options.AddOption(&Option{Id: OptBootfileUrl, Length: 42, Value: []byte("http://[2001:db8:f00f:cafe::4]/bootx64.efi")})
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} else {
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ret_options.AddOption(&Option{Id: OptBootfileUrl, Length: 42, Value: []byte("http://[2001:db8:f00f:cafe::4]/script.ipxe")})
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}
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// ret_options.AddOption(OptRecursiveDns, net.ParseIP("2001:db8:f00f:cafe::1"))
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//ret_options.AddOption(OptBootfileParam, []byte("http://")
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//ret.Options[OptPreference] = [][]byte("http://")
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marshalled_ret_options, _ := ret_options.Marshal()
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ret := make([]byte, len(marshalled_ret_options) + 4, len(marshalled_ret_options) + 4)
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ret[0] = byte(MsgAdvertise)
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copy(ret[1:], p.TransactionID[:])
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copy(ret[4:], marshalled_ret_options)
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return ret, nil
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}
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// TODO: OptClientArchType may not be present
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func (p *Packet) BuildMsgReply(serverDuid []byte) ([]byte, error) {
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in_options, _ := p.UnmarshalOptions()
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ret_options := make(Options)
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ret_options.AddOption(&Option{Id: OptClientId, Length: uint16(len(in_options[OptClientId].Value)), Value: in_options[OptClientId].Value})
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ret_options.AddOption(MakeIaNaOption(in_options[OptIaNa].Value[0:4], 0, 0,
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MakeIaAddrOption(net.ParseIP("2001:db8:f00f:cafe::99"), 27000, 43200)))
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ret_options.AddOption(&Option{Id: OptServerId, Length: uint16(len(serverDuid)), Value: serverDuid})
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// ret_options.AddOption(OptRecursiveDns, net.ParseIP("2001:db8:f00f:cafe::1"))
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if 0x10 == binary.BigEndian.Uint16(in_options[OptClientArchType].Value) { // HTTPClient
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ret_options.AddOption(&Option{Id: OptVendorClass, Length: 16, Value: []byte {0, 0, 0, 0, 0, 10, 72, 84, 84, 80, 67, 108, 105, 101, 110, 116}}) // HTTPClient
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ret_options.AddOption(&Option{Id: OptBootfileUrl, Length: 42, Value: []byte("http://[2001:db8:f00f:cafe::4]/bootx64.efi")})
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} else {
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ret_options.AddOption(&Option{Id: OptBootfileUrl, Length: 42, Value: []byte("http://[2001:db8:f00f:cafe::4]/script.ipxe")})
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}
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marshalled_ret_options, _ := ret_options.Marshal()
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ret := make([]byte, len(marshalled_ret_options) + 4, len(marshalled_ret_options) + 4)
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ret[0] = byte(MsgReply)
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copy(ret[1:], p.TransactionID[:])
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copy(ret[4:], marshalled_ret_options)
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return ret, nil
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}
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func (p *Packet) BuildMsgInformationRequestReply(serverDuid []byte) ([]byte, error) {
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in_options, _ := p.UnmarshalOptions()
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ret_options := make(Options)
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ret_options.AddOption(&Option{Id: OptClientId, Length: uint16(len(in_options[OptClientId].Value)), Value: in_options[OptClientId].Value})
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ret_options.AddOption(&Option{Id: OptServerId, Length: uint16(len(serverDuid)), Value: serverDuid})
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// ret_options.AddOption(OptRecursiveDns, net.ParseIP("2001:db8:f00f:cafe::1"))
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if 0x10 == binary.BigEndian.Uint16(in_options[OptClientArchType].Value) { // HTTPClient
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ret_options.AddOption(&Option{Id: OptVendorClass, Length: 16, Value: []byte {0, 0, 0, 0, 0, 10, 72, 84, 84, 80, 67, 108, 105, 101, 110, 116}}) // HTTPClient
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ret_options.AddOption(&Option{Id: OptBootfileUrl, Length: 42, Value: []byte("http://[2001:db8:f00f:cafe::4]/bootx64.efi")})
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} else {
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ret_options.AddOption(&Option{Id: OptBootfileUrl, Length: 42, Value: []byte("http://[2001:db8:f00f:cafe::4]/script.ipxe")})
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}
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marshalled_ret_options, _ := ret_options.Marshal()
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ret := make([]byte, len(marshalled_ret_options) + 4, len(marshalled_ret_options) + 4)
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ret[0] = byte(MsgReply)
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copy(ret[1:], p.TransactionID[:])
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copy(ret[4:], marshalled_ret_options)
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return ret, nil
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}
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func (p *Packet) BuildMsgReleaseReply(serverDuid []byte) ([]byte, error){
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in_options, _ := p.UnmarshalOptions()
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ret_options := make(Options)
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ret_options.AddOption(&Option{Id: OptClientId, Length: uint16(len(in_options[OptClientId].Value)), Value: in_options[OptClientId].Value})
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ret_options.AddOption(&Option{Id: OptServerId, Length: uint16(len(serverDuid)), Value: serverDuid})
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v := make([]byte, 19, 19)
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copy(v[2:], []byte("Release received."))
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ret_options.AddOption(&Option{Id: OptStatusCode, Length: uint16(len(v)), Value: v})
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marshalled_ret_options, _ := ret_options.Marshal()
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ret := make([]byte, len(marshalled_ret_options) + 4, len(marshalled_ret_options) + 4)
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ret[0] = byte(MsgReply)
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copy(ret[1:], p.TransactionID[:])
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copy(ret[4:], marshalled_ret_options)
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//copy(ret.Options, marshalled_ret_options)
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return ret, nil
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}
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func (p *Packet) ShouldDiscard(serverDuid []byte) error {
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switch p.Type {
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case MsgSolicit:
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return ShouldDiscardSolicit(p)
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case MsgRequest:
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return ShouldDiscardRequest(p, serverDuid)
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case MsgInformationRequest:
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return ShouldDiscardInformationRequest(p, serverDuid)
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case MsgRelease:
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return nil // FIX ME!
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default:
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return fmt.Errorf("Unknown packet")
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}
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}
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func ShouldDiscardSolicit(p *Packet) error {
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options, _ := MakeOptions(p.Options)
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if !options.RequestedBootFileUrlOption() {
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return fmt.Errorf("'Solicit' packet doesn't have file url option")
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}
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if !options.HasClientId() {
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return fmt.Errorf("'Solicit' packet has no client id option")
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}
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if options.HasServerId() {
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return fmt.Errorf("'Solicit' packet has server id option")
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}
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return nil
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}
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func ShouldDiscardRequest(p *Packet, serverDuid []byte) error {
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options, _ := MakeOptions(p.Options)
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if !options.RequestedBootFileUrlOption() {
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return fmt.Errorf("'Request' packet doesn't have file url option")
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}
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if !options.HasClientId() {
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return fmt.Errorf("'Request' packet has no client id option")
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}
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if !options.HasServerId() {
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return fmt.Errorf("'Request' packet has no server id option")
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}
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if bytes.Compare(options[OptServerId].Value, serverDuid) != 0 {
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return fmt.Errorf("'Request' packet's server id option (%d) is different from ours (%d)", options[OptServerId].Value, serverDuid)
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}
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return nil
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}
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func ShouldDiscardInformationRequest(p *Packet, serverDuid []byte) error {
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options, _ := MakeOptions(p.Options)
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if !options.RequestedBootFileUrlOption() {
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return fmt.Errorf("'Information-request' packet doesn't have boot file url option")
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}
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if options.HasIaNa() || options.HasIaTa() {
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return fmt.Errorf("'Information-request' packet has an IA option present")
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}
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if options.HasServerId() && (bytes.Compare(options[OptServerId].Value, serverDuid) != 0) {
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return fmt.Errorf("'Information-request' packet's server id option (%d) is different from ours (%d)", options[OptServerId].Value, serverDuid)
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}
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return nil
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} |