neoneo-go/pkg/peer/peerhandshake.go

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2019-02-25 22:44:14 +00:00
package peer
import (
"fmt"
"net"
"time"
"github.com/CityOfZion/neo-go/pkg/wire"
"github.com/CityOfZion/neo-go/pkg/wire/payload"
iputils "github.com/CityOfZion/neo-go/pkg/wire/util/ip"
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)
// Handshake will initiate a handshake with this peer
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func (p *Peer) Handshake() error {
handshakeErr := make(chan error, 1)
go func() {
if p.inbound {
handshakeErr <- p.inboundHandShake()
} else {
handshakeErr <- p.outboundHandShake()
}
}()
select {
case err := <-handshakeErr:
if err != nil {
return err
}
case <-time.After(handshakeTimeout):
return errHandShakeTimeout
}
// This is purely here for Logs
if p.inbound {
fmt.Println("inbound handshake with", p.RemoteAddr().String(), "successful")
} else {
fmt.Println("outbound handshake with", p.RemoteAddr().String(), "successful")
}
return nil
}
// If this peer has an inbound conn (conn that is going into another peer)
// then he has dialed and so, we must read the version message
func (p *Peer) inboundHandShake() error {
var err error
if err := p.writeLocalVersionMSG(); err != nil {
return err
}
if err := p.readRemoteVersionMSG(); err != nil {
return err
}
verack, err := payload.NewVerackMessage()
if err != nil {
return err
}
err = p.Write(verack)
return p.readVerack()
}
func (p *Peer) outboundHandShake() error {
var err error
err = p.readRemoteVersionMSG()
if err != nil {
return err
}
err = p.writeLocalVersionMSG()
if err != nil {
return err
}
err = p.readVerack()
if err != nil {
return err
}
verack, err := payload.NewVerackMessage()
if err != nil {
return err
}
return p.Write(verack)
}
func (p *Peer) writeLocalVersionMSG() error {
nonce := p.config.Nonce
relay := p.config.Relay
port := int(p.config.Port)
ua := p.config.UserAgent
sh := p.config.StartHeight()
services := p.config.Services
proto := p.config.ProtocolVer
ip := iputils.GetLocalIP()
tcpAddrMe := &net.TCPAddr{IP: ip, Port: port}
messageVer, err := payload.NewVersionMessage(tcpAddrMe, sh, relay, proto, ua, nonce, services)
if err != nil {
return err
}
return p.Write(messageVer)
}
func (p *Peer) readRemoteVersionMSG() error {
readmsg, err := wire.ReadMessage(p.conn, p.config.Net)
if err != nil {
return err
}
version, ok := readmsg.(*payload.VersionMessage)
if !ok {
return err
}
return p.OnVersion(version)
}
func (p *Peer) readVerack() error {
readmsg, err := wire.ReadMessage(p.conn, p.config.Net)
if err != nil {
return err
}
_, ok := readmsg.(*payload.VerackMessage)
if !ok {
return err
}
// should only be accessed on one go-routine
p.verackReceived = true
return nil
}