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/*
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/>.
*/
// Command bootnode runs a bootstrap node for the Discovery Protocol.
package main
import (
"crypto/ecdsa"
"encoding/hex"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p/nat"
)
func main() {
var (
listenAddr = flag.String("addr", ":30301", "listen address")
genKey = flag.String("genkey", "", "generate a node 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|extip:<IP>)")
nodeKey *ecdsa.PrivateKey
err error
)
flag.Parse()
logger.AddLogSystem(logger.NewStdLogSystem(os.Stdout, log.LstdFlags, logger.DebugLevel))
if *genKey != "" {
writeKey(*genKey)
os.Exit(0)
}
natm, err := nat.Parse(*natdesc)
if err != nil {
log.Fatalf("-nat: %v", err)
}
switch {
case *nodeKeyFile == "" && *nodeKeyHex == "":
log.Fatal("Use -nodekey or -nodekeyhex to specify a private key")
case *nodeKeyFile != "" && *nodeKeyHex != "":
log.Fatal("Options -nodekey and -nodekeyhex are mutually exclusive")
case *nodeKeyFile != "":
if nodeKey, err = crypto.LoadECDSA(*nodeKeyFile); err != nil {
log.Fatalf("-nodekey: %v", err)
}
case *nodeKeyHex != "":
if nodeKey, err = crypto.HexToECDSA(*nodeKeyHex); err != nil {
log.Fatalf("-nodekeyhex: %v", err)
}
}
if _, err := discover.ListenUDP(nodeKey, *listenAddr, natm, nil); err != nil {
log.Fatal(err)
}
select {}
}
func writeKey(target string) {
key, err := crypto.GenerateKey()
if err != nil {
log.Fatal("could not generate key: %v", err)
}
b := crypto.FromECDSA(key)
if target == "-" {
fmt.Println(hex.EncodeToString(b))
} else {
if err := ioutil.WriteFile(target, b, 0600); err != nil {
log.Fatal("write error: ", err)
}
}
}
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