137 lines
4.2 KiB
Go
137 lines
4.2 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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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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//
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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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//
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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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// bootnode runs a bootstrap node for the Ethereum Discovery Protocol.
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package main
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import (
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"crypto/ecdsa"
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"flag"
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"fmt"
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"net"
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"os"
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"github.com/ethereum/go-ethereum/cmd/utils"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/p2p/discover"
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"github.com/ethereum/go-ethereum/p2p/discv5"
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"github.com/ethereum/go-ethereum/p2p/nat"
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"github.com/ethereum/go-ethereum/p2p/netutil"
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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")
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writeAddr = flag.Bool("writeaddress", false, "write out the node's pubkey hash 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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netrestrict = flag.String("netrestrict", "", "restrict network communication to the given IP networks (CIDR masks)")
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runv5 = flag.Bool("v5", false, "run a v5 topic discovery bootnode")
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verbosity = flag.Int("verbosity", int(log.LvlInfo), "log verbosity (0-9)")
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vmodule = flag.String("vmodule", "", "log verbosity pattern")
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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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glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
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glogger.Verbosity(log.Lvl(*verbosity))
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glogger.Vmodule(*vmodule)
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log.Root().SetHandler(glogger)
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natm, err := nat.Parse(*natdesc)
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if err != nil {
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utils.Fatalf("-nat: %v", err)
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}
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switch {
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case *genKey != "":
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nodeKey, err = crypto.GenerateKey()
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if err != nil {
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utils.Fatalf("could not generate key: %v", err)
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}
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if err = crypto.SaveECDSA(*genKey, nodeKey); err != nil {
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utils.Fatalf("%v", err)
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}
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return
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case *nodeKeyFile == "" && *nodeKeyHex == "":
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utils.Fatalf("Use -nodekey or -nodekeyhex to specify a private key")
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case *nodeKeyFile != "" && *nodeKeyHex != "":
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utils.Fatalf("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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utils.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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utils.Fatalf("-nodekeyhex: %v", err)
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}
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}
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if *writeAddr {
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fmt.Printf("%v\n", discover.PubkeyID(&nodeKey.PublicKey))
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os.Exit(0)
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}
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var restrictList *netutil.Netlist
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if *netrestrict != "" {
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restrictList, err = netutil.ParseNetlist(*netrestrict)
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if err != nil {
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utils.Fatalf("-netrestrict: %v", err)
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}
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}
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addr, err := net.ResolveUDPAddr("udp", *listenAddr)
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if err != nil {
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utils.Fatalf("-ResolveUDPAddr: %v", err)
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}
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conn, err := net.ListenUDP("udp", addr)
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if err != nil {
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utils.Fatalf("-ListenUDP: %v", err)
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}
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realaddr := conn.LocalAddr().(*net.UDPAddr)
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if natm != nil {
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if !realaddr.IP.IsLoopback() {
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go nat.Map(natm, nil, "udp", realaddr.Port, realaddr.Port, "ethereum discovery")
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}
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// TODO: react to external IP changes over time.
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if ext, err := natm.ExternalIP(); err == nil {
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realaddr = &net.UDPAddr{IP: ext, Port: realaddr.Port}
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}
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}
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if *runv5 {
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if _, err := discv5.ListenUDP(nodeKey, conn, realaddr, "", restrictList); err != nil {
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utils.Fatalf("%v", err)
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}
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} else {
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cfg := discover.Config{
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PrivateKey: nodeKey,
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AnnounceAddr: realaddr,
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NetRestrict: restrictList,
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}
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if _, err := discover.ListenUDP(conn, cfg); err != nil {
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utils.Fatalf("%v", err)
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}
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}
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select {}
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}
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