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handshake.go
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handshake.go
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// Copyright 2015 The CortexTheseus Authors
// This file is part of the CortexTheseus library.
//
// The CortexTheseus 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 CortexTheseus 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 CortexTheseus library. If not, see <http://www.gnu.org/licenses/>.
package ctxc
import (
"math/big"
"time"
"github.com/CortexFoundation/CortexTheseus/common"
"github.com/CortexFoundation/CortexTheseus/core/forkid"
"github.com/CortexFoundation/CortexTheseus/ctxc/protocols/ctxc"
"github.com/CortexFoundation/CortexTheseus/p2p"
)
const (
// handshakeTimeout is the maximum allowed time for the `eth` handshake to
// complete before dropping the connection.= as malicious.
handshakeTimeout = 5 * time.Second
)
// Handshake executes the ctxc protocol handshake, negotiating version number,
// network IDs, difficulties, head and genesis blocks.
func (p *peer) Handshake(network uint64, td *big.Int, head common.Hash, genesis common.Hash, forkID forkid.ID, forkFilter forkid.Filter) error {
// Send out own handshake in a new thread
errc := make(chan error, 2)
var (
//status63 statusData63 // safe to read after two values have been received from errc
status statusData // safe to read after two values have been received from errc
)
go func() {
errc <- p2p.Send(p.rw, ctxc.StatusMsg, &statusData{
ProtocolVersion: uint32(p.version),
NetworkID: network,
TD: td,
Head: head,
Genesis: genesis,
ForkID: forkID,
})
}()
go func() {
errc <- p.readStatus(network, &status, genesis, forkFilter)
}()
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.td, p.head = status.TD, status.Head
return nil
}
/*func (p *peer) readStatusLegacy(network uint64, status *statusData63, genesis common.Hash) error {
msg, err := p.rw.ReadMsg()
if err != nil {
return err
}
if msg.Code != ctxc.StatusMsg {
return errResp(ErrNoStatusMsg, "first msg has code %x (!= %x)", msg.Code, ctxc.StatusMsg)
}
if msg.Size > protocolMaxMsgSize {
return errResp(ErrMsgTooLarge, "%v > %v", msg.Size, protocolMaxMsgSize)
}
// Decode the handshake and make sure everything matches
if err := msg.Decode(&status); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
if status.GenesisBlock != genesis {
return errResp(ErrGenesisMismatch, "%x (!= %x)", status.GenesisBlock[:8], genesis[:8])
}
if status.NetworkId != network {
return errResp(ErrNetworkIDMismatch, "%d (!= %d)", status.NetworkId, network)
}
if uint(status.ProtocolVersion) != p.version {
return errResp(ErrProtocolVersionMismatch, "%d (!= %d)", status.ProtocolVersion, p.version)
}
return nil
}*/
func (p *peer) readStatus(network uint64, status *statusData, genesis common.Hash, forkFilter forkid.Filter) error {
msg, err := p.rw.ReadMsg()
if err != nil {
return err
}
if msg.Code != ctxc.StatusMsg {
return errResp(ErrNoStatusMsg, "first msg has code %x (!= %x)", msg.Code, ctxc.StatusMsg)
}
if msg.Size > protocolMaxMsgSize {
return errResp(ErrMsgTooLarge, "%v > %v", msg.Size, protocolMaxMsgSize)
}
// Decode the handshake and make sure everything matches
if err := msg.Decode(&status); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
if status.NetworkID != network {
return errResp(ErrNetworkIDMismatch, "%d (!= %d)", status.NetworkID, network)
}
if uint(status.ProtocolVersion) != p.version {
return errResp(ErrProtocolVersionMismatch, "%d (!= %d)", status.ProtocolVersion, p.version)
}
if status.Genesis != genesis {
return errResp(ErrGenesisMismatch, "%x (!= %x)", status.Genesis, genesis)
}
if err := forkFilter(status.ForkID); err != nil {
return errResp(ErrForkIDRejected, "%v", err)
}
return nil
}