94 lines
2.6 KiB
Go
94 lines
2.6 KiB
Go
/*
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This file is part of go-ethereum
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go-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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go-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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// Command bootnode runs a bootstrap node for the Discovery Protocol.
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package main
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import (
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"crypto/ecdsa"
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"encoding/hex"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/p2p/discover"
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"github.com/ethereum/go-ethereum/p2p/nat"
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)
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func main() {
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var (
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listenAddr = flag.String("addr", ":30301", "listen address")
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genKey = flag.String("genkey", "", "generate a node key and quit")
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nodeKeyFile = flag.String("nodekey", "", "private key filename")
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nodeKeyHex = flag.String("nodekeyhex", "", "private key as hex (for testing)")
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natdesc = flag.String("nat", "none", "port mapping mechanism (any|none|upnp|pmp|extip:<IP>)")
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nodeKey *ecdsa.PrivateKey
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err error
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)
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flag.Parse()
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logger.AddLogSystem(logger.NewStdLogSystem(os.Stdout, log.LstdFlags, logger.DebugLevel))
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if *genKey != "" {
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writeKey(*genKey)
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os.Exit(0)
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}
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natm, err := nat.Parse(*natdesc)
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if err != nil {
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log.Fatalf("-nat: %v", err)
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}
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switch {
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case *nodeKeyFile == "" && *nodeKeyHex == "":
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log.Fatal("Use -nodekey or -nodekeyhex to specify a private key")
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case *nodeKeyFile != "" && *nodeKeyHex != "":
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log.Fatal("Options -nodekey and -nodekeyhex are mutually exclusive")
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case *nodeKeyFile != "":
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if nodeKey, err = crypto.LoadECDSA(*nodeKeyFile); err != nil {
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log.Fatalf("-nodekey: %v", err)
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}
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case *nodeKeyHex != "":
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if nodeKey, err = crypto.HexToECDSA(*nodeKeyHex); err != nil {
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log.Fatalf("-nodekeyhex: %v", err)
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}
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}
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if _, err := discover.ListenUDP(nodeKey, *listenAddr, natm, ""); err != nil {
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log.Fatal(err)
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}
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select {}
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}
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func writeKey(target string) {
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key, err := crypto.GenerateKey()
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if err != nil {
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log.Fatal("could not generate key: %v", err)
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}
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b := crypto.FromECDSA(key)
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if target == "-" {
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fmt.Println(hex.EncodeToString(b))
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} else {
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if err := ioutil.WriteFile(target, b, 0600); err != nil {
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log.Fatal("write error: ", err)
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}
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}
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}
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