channeldb: implement serialization of onion addresses
Co-Authored-By: Eugene <crypt-iq@users.noreply.github.com>
This commit is contained in:
Wilmer Paulino
parent
e5987a1ef1
commit
3738e68ae2
@ -1,10 +1,12 @@
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package channeldb
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import (
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"encoding/binary"
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"errors"
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"io"
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"net"
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"github.com/btcsuite/go-socks/socks"
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"github.com/lightningnetwork/lnd/tor"
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)
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// addressType specifies the network protocol and version that should be used
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@ -21,38 +23,75 @@ const (
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// v2OnionAddr denotes a version 2 Tor onion service address.
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v2OnionAddr addressType = 2
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// v3OnionAddr denotes a version 3 Tor (prop224) onion service addresses.
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// v3OnionAddr denotes a version 3 Tor (prop224) onion service address.
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v3OnionAddr addressType = 3
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)
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// encodeTCPAddr serializes a TCP address into its compact raw bytes
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// representation.
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func encodeTCPAddr(w io.Writer, addr *net.TCPAddr) error {
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var scratch [16]byte
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var (
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addrType byte
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ip []byte
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)
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if addr.IP.To4() != nil {
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scratch[0] = uint8(tcp4Addr)
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if _, err := w.Write(scratch[:1]); err != nil {
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return err
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}
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copy(scratch[:4], addr.IP.To4())
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if _, err := w.Write(scratch[:4]); err != nil {
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return err
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}
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addrType = byte(tcp4Addr)
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ip = addr.IP.To4()
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} else {
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scratch[0] = uint8(tcp6Addr)
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if _, err := w.Write(scratch[:1]); err != nil {
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addrType = byte(tcp6Addr)
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ip = addr.IP.To16()
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}
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if _, err := w.Write([]byte{addrType}); err != nil {
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return err
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}
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copy(scratch[:], addr.IP.To16())
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if _, err := w.Write(scratch[:]); err != nil {
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if _, err := w.Write(ip); err != nil {
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return err
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}
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var port [2]byte
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byteOrder.PutUint16(port[:], uint16(addr.Port))
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if _, err := w.Write(port[:]); err != nil {
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return err
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}
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byteOrder.PutUint16(scratch[:2], uint16(addr.Port))
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if _, err := w.Write(scratch[:2]); err != nil {
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return nil
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}
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// encodeOnionAddr serializes an onion address into its compact raw bytes
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// representation.
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func encodeOnionAddr(w io.Writer, addr *tor.OnionAddr) error {
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var suffixIndex int
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switch len(addr.OnionService) {
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case tor.V2Len:
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if _, err := w.Write([]byte{byte(v2OnionAddr)}); err != nil {
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return err
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}
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suffixIndex = tor.V2Len - tor.OnionSuffixLen
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case tor.V3Len:
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if _, err := w.Write([]byte{byte(v3OnionAddr)}); err != nil {
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return err
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}
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suffixIndex = tor.V3Len - tor.OnionSuffixLen
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default:
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return errors.New("unknown onion service length")
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}
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host, err := tor.Base32Encoding.DecodeString(
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addr.OnionService[:suffixIndex],
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)
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if err != nil {
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return err
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}
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if _, err := w.Write(host); err != nil {
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return err
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}
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var port [2]byte
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byteOrder.PutUint16(port[:], uint16(addr.Port))
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if _, err := w.Write(port[:]); err != nil {
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return err
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}
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@ -60,42 +99,84 @@ func encodeTCPAddr(w io.Writer, addr *net.TCPAddr) error {
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}
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// deserializeAddr reads the serialized raw representation of an address and
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// deserializes it into the actual address, to avoid performing address
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// resolution in the database module
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// deserializes it into the actual address. This allows us to avoid address
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// resolution within the channeldb package.
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func deserializeAddr(r io.Reader) (net.Addr, error) {
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var scratch [8]byte
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var address net.Addr
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if _, err := r.Read(scratch[:1]); err != nil {
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var addrType [1]byte
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if _, err := r.Read(addrType[:]); err != nil {
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return nil, err
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}
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// TODO(roasbeef): also add onion addrs
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switch addressType(scratch[0]) {
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var address net.Addr
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switch addressType(addrType[0]) {
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case tcp4Addr:
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addr := &net.TCPAddr{}
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var ip [4]byte
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if _, err := r.Read(ip[:]); err != nil {
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return nil, err
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}
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addr.IP = (net.IP)(ip[:])
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if _, err := r.Read(scratch[:2]); err != nil {
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var port [2]byte
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if _, err := r.Read(port[:]); err != nil {
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return nil, err
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}
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addr.Port = int(byteOrder.Uint16(scratch[:2]))
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address = addr
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address = &net.TCPAddr{
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IP: net.IP(ip[:]),
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Port: int(binary.BigEndian.Uint16(port[:])),
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}
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case tcp6Addr:
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addr := &net.TCPAddr{}
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var ip [16]byte
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if _, err := r.Read(ip[:]); err != nil {
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return nil, err
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}
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addr.IP = (net.IP)(ip[:])
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if _, err := r.Read(scratch[:2]); err != nil {
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var port [2]byte
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if _, err := r.Read(port[:]); err != nil {
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return nil, err
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}
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addr.Port = int(byteOrder.Uint16(scratch[:2]))
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address = addr
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address = &net.TCPAddr{
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IP: net.IP(ip[:]),
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Port: int(binary.BigEndian.Uint16(port[:])),
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}
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case v2OnionAddr:
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var h [tor.V2DecodedLen]byte
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if _, err := r.Read(h[:]); err != nil {
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return nil, err
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}
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var p [2]byte
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if _, err := r.Read(p[:]); err != nil {
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return nil, err
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}
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onionService := tor.Base32Encoding.EncodeToString(h[:])
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onionService += tor.OnionSuffix
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port := int(binary.BigEndian.Uint16(p[:]))
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address = &tor.OnionAddr{
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OnionService: onionService,
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Port: port,
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}
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case v3OnionAddr:
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var h [tor.V3DecodedLen]byte
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if _, err := r.Read(h[:]); err != nil {
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return nil, err
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}
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var p [2]byte
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if _, err := r.Read(p[:]); err != nil {
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return nil, err
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}
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onionService := tor.Base32Encoding.EncodeToString(h[:])
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onionService += tor.OnionSuffix
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port := int(binary.BigEndian.Uint16(p[:]))
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address = &tor.OnionAddr{
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OnionService: onionService,
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Port: port,
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}
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default:
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return nil, ErrUnknownAddressType
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}
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@ -103,34 +184,14 @@ func deserializeAddr(r io.Reader) (net.Addr, error) {
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return address, nil
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}
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// serializeAddr serializes an address into a raw byte representation so it
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// can be deserialized without requiring address resolution
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// serializeAddr serializes an address into its raw bytes representation so that
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// it can be deserialized without requiring address resolution.
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func serializeAddr(w io.Writer, address net.Addr) error {
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switch addr := address.(type) {
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case *net.TCPAddr:
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return encodeTCPAddr(w, addr)
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// If this is a proxied address (due to the connection being
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// established over a SOCKs proxy, then we'll convert it into its
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// corresponding TCP address.
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case *socks.ProxiedAddr:
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// If we can't parse the host as an IP (though we should be
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// able to at this point), then we'll skip this address all
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// together.
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//
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// TODO(roasbeef): would be nice to be able to store hosts
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// though...
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ip := net.ParseIP(addr.Host)
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if ip == nil {
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return nil
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}
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tcpAddr := &net.TCPAddr{
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IP: ip,
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Port: addr.Port,
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}
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return encodeTCPAddr(w, tcpAddr)
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case *tor.OnionAddr:
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return encodeOnionAddr(w, addr)
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}
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return nil
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