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- // Copyright 2019 The go-ethereum Authors
- // This file is part of the go-ethereum library.
- //
- // The go-ethereum library is free software: you can redistribute it and/or modify
- // it under the terms of the GNU Lesser General Public License as published by
- // the Free Software Foundation, either version 3 of the License, or
- // (at your option) any later version.
- //
- // The go-ethereum library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU Lesser General Public License for more details.
- //
- // You should have received a copy of the GNU Lesser General Public License
- // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
- package discover
- import (
- "crypto/ecdsa"
- "net"
- "github.com/ethereum/go-ethereum/common/mclock"
- "github.com/ethereum/go-ethereum/log"
- "github.com/ethereum/go-ethereum/p2p/enode"
- "github.com/ethereum/go-ethereum/p2p/enr"
- "github.com/ethereum/go-ethereum/p2p/netutil"
- )
- // UDPConn is a network connection on which discovery can operate.
- type UDPConn interface {
- ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error)
- WriteToUDP(b []byte, addr *net.UDPAddr) (n int, err error)
- Close() error
- LocalAddr() net.Addr
- }
- // Config holds settings for the discovery listener.
- type Config struct {
- // These settings are required and configure the UDP listener:
- PrivateKey *ecdsa.PrivateKey
- // These settings are optional:
- NetRestrict *netutil.Netlist // network whitelist
- Bootnodes []*enode.Node // list of bootstrap nodes
- Unhandled chan<- ReadPacket // unhandled packets are sent on this channel
- Log log.Logger // if set, log messages go here
- ValidSchemes enr.IdentityScheme // allowed identity schemes
- Clock mclock.Clock
- }
- func (cfg Config) withDefaults() Config {
- if cfg.Log == nil {
- cfg.Log = log.Root()
- }
- if cfg.ValidSchemes == nil {
- cfg.ValidSchemes = enode.ValidSchemes
- }
- if cfg.Clock == nil {
- cfg.Clock = mclock.System{}
- }
- return cfg
- }
- // ListenUDP starts listening for discovery packets on the given UDP socket.
- func ListenUDP(c UDPConn, ln *enode.LocalNode, cfg Config) (*UDPv4, error) {
- return ListenV4(c, ln, cfg)
- }
- // ReadPacket is a packet that couldn't be handled. Those packets are sent to the unhandled
- // channel if configured.
- type ReadPacket struct {
- Data []byte
- Addr *net.UDPAddr
- }
- func min(x, y int) int {
- if x > y {
- return y
- }
- return x
- }
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