forked from ontio/ontology
/
handshake.go
225 lines (197 loc) · 6.29 KB
/
handshake.go
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/*
* Copyright (C) 2018 The ontology Authors
* This file is part of The ontology library.
*
* The ontology 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 ontology 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 ontology. If not, see <http://www.gnu.org/licenses/>.
*/
package handshake
import (
"fmt"
"net"
"time"
"github.com/blang/semver"
common2 "github.com/qbyyf/ontology/common"
"github.com/qbyyf/ontology/p2pserver/common"
"github.com/qbyyf/ontology/p2pserver/message/types"
"github.com/qbyyf/ontology/p2pserver/peer"
)
var HANDSHAKE_DURATION = 10 * time.Second // handshake time can not exceed this duration, or will treat as attack.
func HandshakeClient(info *peer.PeerInfo, selfId *common.PeerKeyId, conn net.Conn) (*peer.PeerInfo, error) {
version := newVersion(info)
if err := conn.SetDeadline(time.Now().Add(HANDSHAKE_DURATION)); err != nil {
return nil, err
}
defer func() {
_ = conn.SetDeadline(time.Time{}) //reset back
}()
// 1. sendMsg version
err := sendMsg(conn, version)
if err != nil {
return nil, err
}
// 2. read version
msg, _, err := types.ReadMessage(conn)
if err != nil {
return nil, err
}
receivedVersion, ok := msg.(*types.Version)
if !ok {
return nil, fmt.Errorf("expected version message, but got message type: %s", msg.CmdType())
}
// 3. update kadId
kid := common.PseudoPeerIdFromUint64(receivedVersion.P.Nonce)
if useDHT(receivedVersion.P.SoftVersion, info.SoftVersion) {
err = sendMsg(conn, &types.UpdatePeerKeyId{KadKeyId: selfId})
if err != nil {
return nil, err
}
// 4. read kadkeyid
msg, _, err = types.ReadMessage(conn)
if err != nil {
return nil, err
}
kadKeyId, ok := msg.(*types.UpdatePeerKeyId)
if !ok {
return nil, fmt.Errorf("handshake failed, expect kad id message, got %s", msg.CmdType())
}
kid = kadKeyId.KadKeyId.Id
}
// 5. sendMsg ack
err = sendMsg(conn, &types.VerACK{})
if err != nil {
return nil, err
}
msg, _, err = types.ReadMessage(conn)
if err != nil {
return nil, err
}
// 6. receive verack
if _, ok := msg.(*types.VerACK); !ok {
return nil, fmt.Errorf("handshake failed, expect verack message, got %s", msg.CmdType())
}
return createPeerInfo(receivedVersion, kid, conn.RemoteAddr().String()), nil
}
func HandshakeServer(info *peer.PeerInfo, selfId *common.PeerKeyId, conn net.Conn) (*peer.PeerInfo, error) {
ver := newVersion(info)
if err := conn.SetDeadline(time.Now().Add(HANDSHAKE_DURATION)); err != nil {
return nil, err
}
defer func() {
_ = conn.SetDeadline(time.Time{}) //reset back
}()
// 1. read version
msg, _, err := types.ReadMessage(conn)
if err != nil {
return nil, fmt.Errorf("[HandshakeServer] ReadMessage failed, error: %s", err)
}
if msg.CmdType() != common.VERSION_TYPE {
return nil, fmt.Errorf("[HandshakeServer] expected version message")
}
version := msg.(*types.Version)
// 2. sendMsg version
err = sendMsg(conn, ver)
if err != nil {
return nil, err
}
// 3. read update kadkey id
kid := common.PseudoPeerIdFromUint64(version.P.Nonce)
if useDHT(version.P.SoftVersion, info.SoftVersion) {
msg, _, err := types.ReadMessage(conn)
if err != nil {
return nil, fmt.Errorf("[HandshakeServer] ReadMessage failed, error: %s", err)
}
kadkeyId, ok := msg.(*types.UpdatePeerKeyId)
if !ok {
return nil, fmt.Errorf("[HandshakeServer] expected update kadkeyid message")
}
kid = kadkeyId.KadKeyId.Id
// 4. sendMsg update kadkey id
err = sendMsg(conn, &types.UpdatePeerKeyId{KadKeyId: selfId})
if err != nil {
return nil, err
}
}
// 5. read version ack
msg, _, err = types.ReadMessage(conn)
if err != nil {
return nil, fmt.Errorf("[HandshakeServer] ReadMessage failed, error: %s", err)
}
if msg.CmdType() != common.VERACK_TYPE {
return nil, fmt.Errorf("[HandshakeServer] expected version ack message")
}
// 6. sendMsg ack
err = sendMsg(conn, &types.VerACK{})
if err != nil {
return nil, err
}
return createPeerInfo(version, kid, conn.RemoteAddr().String()), nil
}
func sendMsg(conn net.Conn, msg types.Message) error {
sink := common2.NewZeroCopySink(nil)
types.WriteMessage(sink, msg)
_, err := conn.Write(sink.Bytes())
if err != nil {
return fmt.Errorf("[handshake]error sending messge to %s :%s", conn.RemoteAddr().String(), err.Error())
}
return nil
}
func createPeerInfo(version *types.Version, kid common.PeerId, addr string) *peer.PeerInfo {
return peer.NewPeerInfo(kid, version.P.Version, version.P.Services, version.P.Relay != 0, version.P.HttpInfoPort,
version.P.SyncPort, version.P.StartHeight, version.P.SoftVersion, addr)
}
func newVersion(peerInfo *peer.PeerInfo) *types.Version {
var version types.Version
version.P = types.VersionPayload{
Version: peerInfo.Version,
Services: peerInfo.Services,
SyncPort: peerInfo.Port,
Nonce: peerInfo.Id.ToUint64(),
IsConsensus: false,
HttpInfoPort: peerInfo.HttpInfoPort,
StartHeight: peerInfo.Height(),
TimeStamp: time.Now().UnixNano(),
SoftVersion: peerInfo.SoftVersion,
}
if peerInfo.Relay {
version.P.Relay = 1
} else {
version.P.Relay = 0
}
if peerInfo.HttpInfoPort > 0 {
version.P.Cap[common.HTTP_INFO_FLAG] = 0x01
} else {
version.P.Cap[common.HTTP_INFO_FLAG] = 0x00
}
return &version
}
func useDHT(client, server string) bool {
// we make this symmetric, because config.Version is depend on compile option, so to avoid the case:
// remote version is 1.9.0 and we support DHT, but the config.Version is not valid.
// remote will decide to not use DHT, but we will decide to use DHT, lead to handshake failure.
return supportDHT(client) && supportDHT(server)
}
func supportDHT(version string) bool {
if version == "" {
return false
}
v1, err := semver.ParseTolerant(version)
if err != nil {
return false
}
min, err := semver.ParseTolerant(common.MIN_VERSION_FOR_DHT)
if err != nil {
panic(err) // enforced by testcase
}
return v1.GTE(min)
}