plugeth/cmd/devp2p/keycmd.go

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// Copyright 2020 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/>.
package main
import (
"errors"
"fmt"
"net"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/p2p/enr"
"github.com/urfave/cli/v2"
)
var (
keyCommand = &cli.Command{
Name: "key",
Usage: "Operations on node keys",
Subcommands: []*cli.Command{
keyGenerateCommand,
keyToIDCommand,
keyToNodeCommand,
keyToRecordCommand,
},
}
keyGenerateCommand = &cli.Command{
Name: "generate",
Usage: "Generates node key files",
ArgsUsage: "keyfile",
Action: genkey,
}
keyToIDCommand = &cli.Command{
Name: "to-id",
Usage: "Creates a node ID from a node key file",
ArgsUsage: "keyfile",
Action: keyToID,
Flags: []cli.Flag{},
}
keyToNodeCommand = &cli.Command{
Name: "to-enode",
Usage: "Creates an enode URL from a node key file",
ArgsUsage: "keyfile",
Action: keyToURL,
Flags: []cli.Flag{hostFlag, tcpPortFlag, udpPortFlag},
}
keyToRecordCommand = &cli.Command{
Name: "to-enr",
Usage: "Creates an ENR from a node key file",
ArgsUsage: "keyfile",
Action: keyToRecord,
Flags: []cli.Flag{hostFlag, tcpPortFlag, udpPortFlag},
}
)
var (
hostFlag = &cli.StringFlag{
Name: "ip",
Usage: "IP address of the node",
Value: "127.0.0.1",
}
tcpPortFlag = &cli.IntFlag{
Name: "tcp",
Usage: "TCP port of the node",
Value: 30303,
}
udpPortFlag = &cli.IntFlag{
Name: "udp",
Usage: "UDP port of the node",
Value: 30303,
}
)
func genkey(ctx *cli.Context) error {
if ctx.NArg() != 1 {
return errors.New("need key file as argument")
}
file := ctx.Args().Get(0)
key, err := crypto.GenerateKey()
if err != nil {
return fmt.Errorf("could not generate key: %v", err)
}
return crypto.SaveECDSA(file, key)
}
func keyToID(ctx *cli.Context) error {
n, err := makeRecord(ctx)
if err != nil {
return err
}
fmt.Println(n.ID())
return nil
}
func keyToURL(ctx *cli.Context) error {
n, err := makeRecord(ctx)
if err != nil {
return err
}
fmt.Println(n.URLv4())
return nil
}
func keyToRecord(ctx *cli.Context) error {
n, err := makeRecord(ctx)
if err != nil {
return err
}
fmt.Println(n.String())
return nil
}
func makeRecord(ctx *cli.Context) (*enode.Node, error) {
if ctx.NArg() != 1 {
return nil, errors.New("need key file as argument")
}
var (
file = ctx.Args().Get(0)
host = ctx.String(hostFlag.Name)
tcp = ctx.Int(tcpPortFlag.Name)
udp = ctx.Int(udpPortFlag.Name)
)
key, err := crypto.LoadECDSA(file)
if err != nil {
return nil, err
}
var r enr.Record
if host != "" {
ip := net.ParseIP(host)
if ip == nil {
return nil, fmt.Errorf("invalid IP address %q", host)
}
r.Set(enr.IP(ip))
}
if udp != 0 {
r.Set(enr.UDP(udp))
}
if tcp != 0 {
r.Set(enr.TCP(tcp))
}
if err := enode.SignV4(&r, key); err != nil {
return nil, err
}
return enode.New(enode.ValidSchemes, &r)
}