mirror of https://github.com/ethereum/go-ethereum
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/* |
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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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) |
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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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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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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); 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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