Official Go implementation of the Ethereum protocol
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go-ethereum/cmd/bootnode/main.go

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6.0 KiB

// Copyright 2015 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
// bootnode runs a bootstrap node for the Ethereum Discovery Protocol.
package main
import (
"crypto/ecdsa"
"flag"
"fmt"
"net"
"os"
"time"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/p2p/nat"
"github.com/ethereum/go-ethereum/p2p/netutil"
)
func main() {
var (
listenAddr = flag.String("addr", ":30301", "listen address")
genKey = flag.String("genkey", "", "generate a node key")
writeAddr = flag.Bool("writeaddress", false, "write out the node's public key and quit")
nodeKeyFile = flag.String("nodekey", "", "private key filename")
nodeKeyHex = flag.String("nodekeyhex", "", "private key as hex (for testing)")
natdesc = flag.String("nat", "none", "port mapping mechanism (any|none|upnp|pmp|pmp:<IP>|extip:<IP>)")
netrestrict = flag.String("netrestrict", "", "restrict network communication to the given IP networks (CIDR masks)")
runv5 = flag.Bool("v5", false, "run a v5 topic discovery bootnode")
verbosity = flag.Int("verbosity", int(log.LvlInfo), "log verbosity (0-5)")
vmodule = flag.String("vmodule", "", "log verbosity pattern")
nodeKey *ecdsa.PrivateKey
err error
)
flag.Parse()
glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
glogger.Verbosity(log.Lvl(*verbosity))
glogger.Vmodule(*vmodule)
log.Root().SetHandler(glogger)
natm, err := nat.Parse(*natdesc)
if err != nil {
utils.Fatalf("-nat: %v", err)
}
switch {
case *genKey != "":
nodeKey, err = crypto.GenerateKey()
if err != nil {
utils.Fatalf("could not generate key: %v", err)
}
if err = crypto.SaveECDSA(*genKey, nodeKey); err != nil {
utils.Fatalf("%v", err)
}
if !*writeAddr {
return
}
case *nodeKeyFile == "" && *nodeKeyHex == "":
utils.Fatalf("Use -nodekey or -nodekeyhex to specify a private key")
case *nodeKeyFile != "" && *nodeKeyHex != "":
utils.Fatalf("Options -nodekey and -nodekeyhex are mutually exclusive")
case *nodeKeyFile != "":
if nodeKey, err = crypto.LoadECDSA(*nodeKeyFile); err != nil {
utils.Fatalf("-nodekey: %v", err)
}
case *nodeKeyHex != "":
if nodeKey, err = crypto.HexToECDSA(*nodeKeyHex); err != nil {
utils.Fatalf("-nodekeyhex: %v", err)
}
}
if *writeAddr {
fmt.Printf("%x\n", crypto.FromECDSAPub(&nodeKey.PublicKey)[1:])
os.Exit(0)
}
var restrictList *netutil.Netlist
if *netrestrict != "" {
restrictList, err = netutil.ParseNetlist(*netrestrict)
if err != nil {
utils.Fatalf("-netrestrict: %v", err)
}
}
addr, err := net.ResolveUDPAddr("udp", *listenAddr)
if err != nil {
utils.Fatalf("-ResolveUDPAddr: %v", err)
}
conn, err := net.ListenUDP("udp", addr)
if err != nil {
utils.Fatalf("-ListenUDP: %v", err)
}
db, _ := enode.OpenDB("")
ln := enode.NewLocalNode(db, nodeKey)
listenerAddr := conn.LocalAddr().(*net.UDPAddr)
if natm != nil && !listenerAddr.IP.IsLoopback() {
natAddr := doPortMapping(natm, ln, listenerAddr)
if natAddr != nil {
listenerAddr = natAddr
}
}
printNotice(&nodeKey.PublicKey, *listenerAddr)
cfg := discover.Config{
PrivateKey: nodeKey,
NetRestrict: restrictList,
}
if *runv5 {
if _, err := discover.ListenV5(conn, ln, cfg); err != nil {
utils.Fatalf("%v", err)
}
} else {
if _, err := discover.ListenUDP(conn, ln, cfg); err != nil {
utils.Fatalf("%v", err)
}
}
select {}
}
func printNotice(nodeKey *ecdsa.PublicKey, addr net.UDPAddr) {
if addr.IP.IsUnspecified() {
addr.IP = net.IP{127, 0, 0, 1}
}
n := enode.NewV4(nodeKey, addr.IP, 0, addr.Port)
fmt.Println(n.URLv4())
fmt.Println("Note: you're using cmd/bootnode, a developer tool.")
fmt.Println("We recommend using a regular node as bootstrap node for production deployments.")
}
func doPortMapping(natm nat.Interface, ln *enode.LocalNode, addr *net.UDPAddr) *net.UDPAddr {
const (
protocol = "udp"
name = "ethereum discovery"
)
newLogger := func(external int, internal int) log.Logger {
return log.New("proto", protocol, "extport", external, "intport", internal, "interface", natm)
}
var (
intport = addr.Port
extaddr = &net.UDPAddr{IP: addr.IP, Port: addr.Port}
mapTimeout = nat.DefaultMapTimeout
log = newLogger(addr.Port, intport)
)
addMapping := func() {
// Get the external address.
var err error
extaddr.IP, err = natm.ExternalIP()
if err != nil {
log.Debug("Couldn't get external IP", "err", err)
return
}
// Create the mapping.
p, err := natm.AddMapping(protocol, extaddr.Port, intport, name, mapTimeout)
if err != nil {
log.Debug("Couldn't add port mapping", "err", err)
return
}
if p != uint16(extaddr.Port) {
extaddr.Port = int(p)
log = newLogger(extaddr.Port, intport)
log.Info("NAT mapped alternative port")
} else {
log.Info("NAT mapped port")
}
// Update IP/port information of the local node.
ln.SetStaticIP(extaddr.IP)
ln.SetFallbackUDP(extaddr.Port)
}
// Perform mapping once, synchronously.
log.Info("Attempting port mapping")
addMapping()
// Refresh the mapping periodically.
go func() {
refresh := time.NewTimer(mapTimeout)
for range refresh.C {
addMapping()
refresh.Reset(mapTimeout)
}
}()
return extaddr
}