104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
package channeldb
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import (
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"io"
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"net"
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)
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// addressType specifies the network protocol and version that should be used
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// when connecting to a node at a particular address.
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type addressType uint8
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const (
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// tcp4Addr denotes an IPv4 TCP address.
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tcp4Addr addressType = 0
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// tcp6Addr denotes an IPv6 TCP address.
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tcp6Addr addressType = 1
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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 addressType = 3
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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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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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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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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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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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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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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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default:
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return nil, ErrUnknownAddressType
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}
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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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func serializeAddr(w io.Writer, address net.Addr) error {
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var scratch [16]byte
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if address.Network() == "tcp" {
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if address.(*net.TCPAddr).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], address.(*net.TCPAddr).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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} 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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return err
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}
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copy(scratch[:], address.(*net.TCPAddr).IP.To16())
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if _, err := w.Write(scratch[:]); err != nil {
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return err
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}
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}
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byteOrder.PutUint16(scratch[:2],
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uint16(address.(*net.TCPAddr).Port))
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if _, err := w.Write(scratch[:2]); err != nil {
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return err
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}
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}
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return nil
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}
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