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// 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"
"os"
"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/discv5"
"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 pubkey hash 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|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 (0-9)")
vmodule = flag.String("vmodule", "", "log verbosity pattern")
nodeKey *ecdsa.PrivateKey
err error
)
flag.Parse()
glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat()))
glogger.Verbosity(log.Lvl(*verbosity))
glogger.Vmodule(*vmodule)
log.Root().SetHandler(glogger)
natm, err := nat.Parse(*natdesc)
if err != nil {
log.Crit(fmt.Sprintf("-nat: %v", err))
}
switch {
case *genKey != "":
nodeKey, err = crypto.GenerateKey()
if err != nil {
log.Crit(fmt.Sprintf("could not generate key: %v", err))
}
if err = crypto.SaveECDSA(*genKey, nodeKey); err != nil {
log.Crit(fmt.Sprintf("%v", err))
}
case *nodeKeyFile == "" && *nodeKeyHex == "":
log.Crit(fmt.Sprintf("Use -nodekey or -nodekeyhex to specify a private key"))
case *nodeKeyFile != "" && *nodeKeyHex != "":
log.Crit(fmt.Sprintf("Options -nodekey and -nodekeyhex are mutually exclusive"))
case *nodeKeyFile != "":
if nodeKey, err = crypto.LoadECDSA(*nodeKeyFile); err != nil {
log.Crit(fmt.Sprintf("-nodekey: %v", err))
}
case *nodeKeyHex != "":
if nodeKey, err = crypto.HexToECDSA(*nodeKeyHex); err != nil {
log.Crit(fmt.Sprintf("-nodekeyhex: %v", err))
}
}
if *writeAddr {
fmt.Printf("%v\n", discover.PubkeyID(&nodeKey.PublicKey))
os.Exit(0)
}
var restrictList *netutil.Netlist
if *netrestrict != "" {
restrictList, err = netutil.ParseNetlist(*netrestrict)
if err != nil {
log.Crit(fmt.Sprintf("-netrestrict: %v", err))
}
}
if *runv5 {
if _, err := discv5.ListenUDP(nodeKey, *listenAddr, natm, "", restrictList); err != nil {
log.Crit(fmt.Sprintf("%v", err))
}
} else {
if _, err := discover.ListenUDP(nodeKey, *listenAddr, natm, "", restrictList); err != nil {
log.Crit(fmt.Sprintf("%v", err))
}
}
select {}
}
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