erigon-pulse/cmd/bootnode/main.go
Felföldi Zsolt 92580d69d3 p2p, p2p/discover, p2p/discv5: implement UDP port sharing (#15200)
This commit affects p2p/discv5 "topic discovery" by running it on
the same UDP port where the old discovery works. This is realized
by giving an "unhandled" packet channel to the old v4 discovery
packet handler where all invalid packets are sent. These packets
are then processed by v5. v5 packets are always invalid when
interpreted by v4 and vice versa. This is ensured by adding one
to the first byte of the packet hash in v5 packets.

DiscoveryV5Bootnodes is also changed to point to new bootnodes
that are implementing the changed packet format with modified
hash. Existing and new v5 bootnodes are both running on different
ports ATM.
2018-01-22 13:38:34 +01:00

132 lines
4.1 KiB
Go

// 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"
"net"
"os"
"github.com/ethereum/go-ethereum/cmd/utils"
"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(false)))
glogger.Verbosity(log.Lvl(*verbosity))
glogger.Vmodule(*vmodule)
log.Root().SetHandler(glogger)
natm, err := nat.Parse(*natdesc)
if err != nil {
utils.Fatalf("-nat: %v", err)
}
switch {
case *genKey != "":
nodeKey, err = crypto.GenerateKey()
if err != nil {
utils.Fatalf("could not generate key: %v", err)
}
if err = crypto.SaveECDSA(*genKey, nodeKey); err != nil {
utils.Fatalf("%v", err)
}
return
case *nodeKeyFile == "" && *nodeKeyHex == "":
utils.Fatalf("Use -nodekey or -nodekeyhex to specify a private key")
case *nodeKeyFile != "" && *nodeKeyHex != "":
utils.Fatalf("Options -nodekey and -nodekeyhex are mutually exclusive")
case *nodeKeyFile != "":
if nodeKey, err = crypto.LoadECDSA(*nodeKeyFile); err != nil {
utils.Fatalf("-nodekey: %v", err)
}
case *nodeKeyHex != "":
if nodeKey, err = crypto.HexToECDSA(*nodeKeyHex); err != nil {
utils.Fatalf("-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 {
utils.Fatalf("-netrestrict: %v", err)
}
}
addr, err := net.ResolveUDPAddr("udp", *listenAddr)
if err != nil {
utils.Fatalf("-ResolveUDPAddr: %v", err)
}
conn, err := net.ListenUDP("udp", addr)
if err != nil {
utils.Fatalf("-ListenUDP: %v", err)
}
realaddr := conn.LocalAddr().(*net.UDPAddr)
if natm != nil {
if !realaddr.IP.IsLoopback() {
go nat.Map(natm, nil, "udp", realaddr.Port, realaddr.Port, "ethereum discovery")
}
// TODO: react to external IP changes over time.
if ext, err := natm.ExternalIP(); err == nil {
realaddr = &net.UDPAddr{IP: ext, Port: realaddr.Port}
}
}
if *runv5 {
if _, err := discv5.ListenUDP(nodeKey, conn, realaddr, "", restrictList); err != nil {
utils.Fatalf("%v", err)
}
} else {
if _, err := discover.ListenUDP(nodeKey, conn, realaddr, nil, "", restrictList); err != nil {
utils.Fatalf("%v", err)
}
}
select {}
}