7c1c8e2e88
* add timeout for stopping p2p server * extend extension wait time * add unit tests * fix lint issue
83 lines
2.3 KiB
Go
83 lines
2.3 KiB
Go
// Copyright 2015 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library 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 Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package diff
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/common/gopool"
|
|
"github.com/ethereum/go-ethereum/p2p"
|
|
)
|
|
|
|
const (
|
|
// handshakeTimeout is the maximum allowed time for the `diff` handshake to
|
|
// complete before dropping the connection as malicious.
|
|
handshakeTimeout = 5 * time.Second
|
|
)
|
|
|
|
// Handshake executes the diff protocol handshake,
|
|
func (p *Peer) Handshake(diffSync bool) error {
|
|
// Send out own handshake in a new thread
|
|
errc := make(chan error, 2)
|
|
|
|
var cap DiffCapPacket // safe to read after two values have been received from errc
|
|
|
|
gopool.Submit(func() {
|
|
errc <- p2p.Send(p.rw, DiffCapMsg, &DiffCapPacket{
|
|
DiffSync: diffSync,
|
|
Extra: defaultExtra,
|
|
})
|
|
})
|
|
gopool.Submit(func() {
|
|
errc <- p.readCap(&cap)
|
|
})
|
|
timeout := time.NewTimer(handshakeTimeout)
|
|
defer timeout.Stop()
|
|
for i := 0; i < 2; i++ {
|
|
select {
|
|
case err := <-errc:
|
|
if err != nil {
|
|
return err
|
|
}
|
|
case <-timeout.C:
|
|
return p2p.DiscReadTimeout
|
|
}
|
|
}
|
|
p.diffSync = cap.DiffSync
|
|
return nil
|
|
}
|
|
|
|
// readStatus reads the remote handshake message.
|
|
func (p *Peer) readCap(cap *DiffCapPacket) error {
|
|
msg, err := p.rw.ReadMsg()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if msg.Code != DiffCapMsg {
|
|
return fmt.Errorf("%w: first msg has code %x (!= %x)", errNoCapMsg, msg.Code, DiffCapMsg)
|
|
}
|
|
if msg.Size > maxMessageSize {
|
|
return fmt.Errorf("%w: %v > %v", errMsgTooLarge, msg.Size, maxMessageSize)
|
|
}
|
|
// Decode the handshake and make sure everything matches
|
|
if err := msg.Decode(cap); err != nil {
|
|
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
|
|
}
|
|
return nil
|
|
}
|