// handshake sends the protocol initiation status message to the remote peer and
// verifies the remote status too.
func (self *peer) handshake() error {
// Send the handshake status message asynchronously
errc := make(chan error, 1)
go func() {
errc <- p2p.SendItems(self.ws, statusCode, protocolVersion)
}()
// Fetch the remote status packet and verify protocol match
packet, err := self.ws.ReadMsg()
if err != nil {
return err
}
if packet.Code != statusCode {
return fmt.Errorf("peer sent %x before status packet", packet.Code)
}
s := rlp.NewStream(packet.Payload, uint64(packet.Size))
if _, err := s.List(); err != nil {
return fmt.Errorf("bad status message: %v", err)
}
peerVersion, err := s.Uint()
if err != nil {
return fmt.Errorf("bad status message: %v", err)
}
if peerVersion != protocolVersion {
return fmt.Errorf("protocol version mismatch %d != %d", peerVersion, protocolVersion)
}
// Wait until out own status is consumed too
if err := <-errc; err != nil {
return fmt.Errorf("failed to send status packet: %v", err)
}
return nil
}
func TestPeerHandshakeSuccess(t *testing.T) {
tester := startTestPeer()
// Wait for and check the handshake
if err := p2p.ExpectMsg(tester.stream, statusCode, []uint64{protocolVersion}); err != nil {
t.Fatalf("status message mismatch: %v", err)
}
// Send a valid handshake status and make sure connection stays live
if err := p2p.SendItems(tester.stream, statusCode, protocolVersion); err != nil {
t.Fatalf("failed to send status: %v", err)
}
select {
case <-tester.termed:
t.Fatalf("valid handshake disconnected")
case <-time.After(100 * time.Millisecond):
}
// Clean up the test
tester.stream.Close()
select {
case <-tester.termed:
case <-time.After(time.Second):
t.Fatalf("local close timed out")
}
}
func startTestPeerInited() (*testPeer, error) {
peer := startTestPeer()
if err := p2p.ExpectMsg(peer.stream, statusCode, []uint64{protocolVersion}); err != nil {
peer.stream.Close()
return nil, err
}
if err := p2p.SendItems(peer.stream, statusCode, protocolVersion); err != nil {
peer.stream.Close()
return nil, err
}
return peer, nil
}
func TestPeerHandshakeFail(t *testing.T) {
tester := startTestPeer()
// Wait for and check the handshake
if err := p2p.ExpectMsg(tester.stream, statusCode, []uint64{protocolVersion}); err != nil {
t.Fatalf("status message mismatch: %v", err)
}
// Send an invalid handshake status and verify disconnect
if err := p2p.SendItems(tester.stream, messagesCode); err != nil {
t.Fatalf("failed to send malformed status: %v", err)
}
select {
case <-tester.termed:
case <-time.After(time.Second):
t.Fatalf("remote close timed out")
}
}