95 lines
2.4 KiB
Go
95 lines
2.4 KiB
Go
// 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 (
|
|
"fmt"
|
|
"net"
|
|
|
|
"github.com/ethereum/go-ethereum/common/hexutil"
|
|
"github.com/ethereum/go-ethereum/crypto"
|
|
"github.com/ethereum/go-ethereum/p2p"
|
|
"github.com/ethereum/go-ethereum/p2p/rlpx"
|
|
"github.com/ethereum/go-ethereum/rlp"
|
|
"gopkg.in/urfave/cli.v1"
|
|
)
|
|
|
|
var (
|
|
rlpxCommand = cli.Command{
|
|
Name: "rlpx",
|
|
Usage: "RLPx Commands",
|
|
Subcommands: []cli.Command{
|
|
rlpxPingCommand,
|
|
},
|
|
}
|
|
rlpxPingCommand = cli.Command{
|
|
Name: "ping",
|
|
Usage: "Perform a RLPx handshake",
|
|
ArgsUsage: "<node>",
|
|
Action: rlpxPing,
|
|
}
|
|
)
|
|
|
|
func rlpxPing(ctx *cli.Context) error {
|
|
n := getNodeArg(ctx)
|
|
|
|
fd, err := net.Dial("tcp", fmt.Sprintf("%v:%d", n.IP(), n.TCP()))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
conn := rlpx.NewConn(fd, n.Pubkey())
|
|
|
|
ourKey, _ := crypto.GenerateKey()
|
|
_, err = conn.Handshake(ourKey)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
code, data, _, err := conn.Read()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
switch code {
|
|
case 0:
|
|
var h devp2pHandshake
|
|
if err := rlp.DecodeBytes(data, &h); err != nil {
|
|
return fmt.Errorf("invalid handshake: %v", err)
|
|
}
|
|
fmt.Printf("%+v\n", h)
|
|
case 1:
|
|
var msg []p2p.DiscReason
|
|
if rlp.DecodeBytes(data, &msg); len(msg) == 0 {
|
|
return fmt.Errorf("invalid disconnect message")
|
|
}
|
|
return fmt.Errorf("received disconnect message: %v", msg[0])
|
|
default:
|
|
return fmt.Errorf("invalid message code %d, expected handshake (code zero)", code)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// devp2pHandshake is the RLP structure of the devp2p protocol handshake.
|
|
type devp2pHandshake struct {
|
|
Version uint64
|
|
Name string
|
|
Caps []p2p.Cap
|
|
ListenPort uint64
|
|
ID hexutil.Bytes // secp256k1 public key
|
|
// Ignore additional fields (for forward compatibility).
|
|
Rest []rlp.RawValue `rlp:"tail"`
|
|
}
|