lnd/channeldb/addr.go

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package channeldb
import (
"io"
"net"
"github.com/btcsuite/go-socks/socks"
)
// addressType specifies the network protocol and version that should be used
// when connecting to a node at a particular address.
type addressType uint8
const (
// tcp4Addr denotes an IPv4 TCP address.
tcp4Addr addressType = 0
// tcp6Addr denotes an IPv6 TCP address.
tcp6Addr addressType = 1
// v2OnionAddr denotes a version 2 Tor onion service address.
v2OnionAddr addressType = 2
// v3OnionAddr denotes a version 3 Tor (prop224) onion service addresses.
v3OnionAddr addressType = 3
)
func encodeTCPAddr(w io.Writer, addr *net.TCPAddr) error {
var scratch [16]byte
if addr.IP.To4() != nil {
scratch[0] = uint8(tcp4Addr)
if _, err := w.Write(scratch[:1]); err != nil {
return err
}
copy(scratch[:4], addr.IP.To4())
if _, err := w.Write(scratch[:4]); err != nil {
return err
}
} else {
scratch[0] = uint8(tcp6Addr)
if _, err := w.Write(scratch[:1]); err != nil {
return err
}
copy(scratch[:], addr.IP.To16())
if _, err := w.Write(scratch[:]); err != nil {
return err
}
}
byteOrder.PutUint16(scratch[:2], uint16(addr.Port))
if _, err := w.Write(scratch[:2]); err != nil {
return err
}
return nil
}
// deserializeAddr reads the serialized raw representation of an address and
// deserializes it into the actual address, to avoid performing address
// resolution in the database module
func deserializeAddr(r io.Reader) (net.Addr, error) {
var scratch [8]byte
var address net.Addr
if _, err := r.Read(scratch[:1]); err != nil {
return nil, err
}
// TODO(roasbeef): also add onion addrs
switch addressType(scratch[0]) {
case tcp4Addr:
addr := &net.TCPAddr{}
var ip [4]byte
if _, err := r.Read(ip[:]); err != nil {
return nil, err
}
addr.IP = (net.IP)(ip[:])
if _, err := r.Read(scratch[:2]); err != nil {
return nil, err
}
addr.Port = int(byteOrder.Uint16(scratch[:2]))
address = addr
case tcp6Addr:
addr := &net.TCPAddr{}
var ip [16]byte
if _, err := r.Read(ip[:]); err != nil {
return nil, err
}
addr.IP = (net.IP)(ip[:])
if _, err := r.Read(scratch[:2]); err != nil {
return nil, err
}
addr.Port = int(byteOrder.Uint16(scratch[:2]))
address = addr
default:
return nil, ErrUnknownAddressType
}
return address, nil
}
// serializeAddr serializes an address into a raw byte representation so it
// can be deserialized without requiring address resolution
func serializeAddr(w io.Writer, address net.Addr) error {
switch addr := address.(type) {
case *net.TCPAddr:
return encodeTCPAddr(w, addr)
// If this is a proxied address (due to the connection being
// established over a SOCKs proxy, then we'll convert it into its
// corresponding TCP address.
case *socks.ProxiedAddr:
// If we can't parse the host as an IP (though we should be
// able to at this point), then we'll skip this address all
// together.
//
// TODO(roasbeef): would be nice to be able to store hosts
// though...
ip := net.ParseIP(addr.Host)
if ip == nil {
return nil
}
tcpAddr := &net.TCPAddr{
IP: ip,
Port: addr.Port,
}
return encodeTCPAddr(w, tcpAddr)
}
return nil
}