package p2p
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"math"
|
|
"net"
|
|
"strconv"
|
|
"sync"
|
|
|
|
"golang.org/x/net/netutil"
|
|
|
|
"github.com/tendermint/tendermint/crypto"
|
|
"github.com/tendermint/tendermint/internal/libs/protoio"
|
|
"github.com/tendermint/tendermint/internal/p2p/conn"
|
|
"github.com/tendermint/tendermint/libs/log"
|
|
p2pproto "github.com/tendermint/tendermint/proto/tendermint/p2p"
|
|
"github.com/tendermint/tendermint/types"
|
|
)
|
|
|
|
const (
|
|
MConnProtocol Protocol = "mconn"
|
|
TCPProtocol Protocol = "tcp"
|
|
)
|
|
|
|
// MConnTransportOptions sets options for MConnTransport.
|
|
type MConnTransportOptions struct {
|
|
// MaxAcceptedConnections is the maximum number of simultaneous accepted
|
|
// (incoming) connections. Beyond this, new connections will block until
|
|
// a slot is free. 0 means unlimited.
|
|
//
|
|
// FIXME: We may want to replace this with connection accounting in the
|
|
// Router, since it will need to do e.g. rate limiting and such as well.
|
|
// But it might also make sense to have per-transport limits.
|
|
MaxAcceptedConnections uint32
|
|
}
|
|
|
|
// MConnTransport is a Transport implementation using the current multiplexed
|
|
// Tendermint protocol ("MConn").
|
|
type MConnTransport struct {
|
|
logger log.Logger
|
|
options MConnTransportOptions
|
|
mConnConfig conn.MConnConfig
|
|
channelDescs []*ChannelDescriptor
|
|
closeCh chan struct{}
|
|
closeOnce sync.Once
|
|
|
|
listener net.Listener
|
|
}
|
|
|
|
// NewMConnTransport sets up a new MConnection transport. This uses the
|
|
// proprietary Tendermint MConnection protocol, which is implemented as
|
|
// conn.MConnection.
|
|
func NewMConnTransport(
|
|
logger log.Logger,
|
|
mConnConfig conn.MConnConfig,
|
|
channelDescs []*ChannelDescriptor,
|
|
options MConnTransportOptions,
|
|
) *MConnTransport {
|
|
return &MConnTransport{
|
|
logger: logger,
|
|
options: options,
|
|
mConnConfig: mConnConfig,
|
|
closeCh: make(chan struct{}),
|
|
channelDescs: channelDescs,
|
|
}
|
|
}
|
|
|
|
// String implements Transport.
|
|
func (m *MConnTransport) String() string {
|
|
return string(MConnProtocol)
|
|
}
|
|
|
|
// Protocols implements Transport. We support tcp for backwards-compatibility.
|
|
func (m *MConnTransport) Protocols() []Protocol {
|
|
return []Protocol{MConnProtocol, TCPProtocol}
|
|
}
|
|
|
|
// Endpoints implements Transport.
|
|
func (m *MConnTransport) Endpoints() []Endpoint {
|
|
if m.listener == nil {
|
|
return []Endpoint{}
|
|
}
|
|
select {
|
|
case <-m.closeCh:
|
|
return []Endpoint{}
|
|
default:
|
|
}
|
|
endpoint := Endpoint{
|
|
Protocol: MConnProtocol,
|
|
}
|
|
if addr, ok := m.listener.Addr().(*net.TCPAddr); ok {
|
|
endpoint.IP = addr.IP
|
|
endpoint.Port = uint16(addr.Port)
|
|
}
|
|
return []Endpoint{endpoint}
|
|
}
|
|
|
|
// Listen asynchronously listens for inbound connections on the given endpoint.
|
|
// It must be called exactly once before calling Accept(), and the caller must
|
|
// call Close() to shut down the listener.
|
|
//
|
|
// FIXME: Listen currently only supports listening on a single endpoint, it
|
|
// might be useful to support listening on multiple addresses (e.g. IPv4 and
|
|
// IPv6, or a private and public address) via multiple Listen() calls.
|
|
func (m *MConnTransport) Listen(endpoint Endpoint) error {
|
|
if m.listener != nil {
|
|
return errors.New("transport is already listening")
|
|
}
|
|
if err := m.validateEndpoint(endpoint); err != nil {
|
|
return err
|
|
}
|
|
|
|
listener, err := net.Listen("tcp", net.JoinHostPort(
|
|
endpoint.IP.String(), strconv.Itoa(int(endpoint.Port))))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if m.options.MaxAcceptedConnections > 0 {
|
|
// FIXME: This will establish the inbound connection but simply hang it
|
|
// until another connection is released. It would probably be better to
|
|
// return an error to the remote peer or close the connection. This is
|
|
// also a DoS vector since the connection will take up kernel resources.
|
|
// This was just carried over from the legacy P2P stack.
|
|
listener = netutil.LimitListener(listener, int(m.options.MaxAcceptedConnections))
|
|
}
|
|
m.listener = listener
|
|
|
|
return nil
|
|
}
|
|
|
|
// Accept implements Transport.
|
|
func (m *MConnTransport) Accept() (Connection, error) {
|
|
if m.listener == nil {
|
|
return nil, errors.New("transport is not listening")
|
|
}
|
|
|
|
tcpConn, err := m.listener.Accept()
|
|
if err != nil {
|
|
select {
|
|
case <-m.closeCh:
|
|
return nil, io.EOF
|
|
default:
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return newMConnConnection(m.logger, tcpConn, m.mConnConfig, m.channelDescs), nil
|
|
}
|
|
|
|
// Dial implements Transport.
|
|
func (m *MConnTransport) Dial(ctx context.Context, endpoint Endpoint) (Connection, error) {
|
|
if err := m.validateEndpoint(endpoint); err != nil {
|
|
return nil, err
|
|
}
|
|
if endpoint.Port == 0 {
|
|
endpoint.Port = 26657
|
|
}
|
|
|
|
dialer := net.Dialer{}
|
|
tcpConn, err := dialer.DialContext(ctx, "tcp", net.JoinHostPort(
|
|
endpoint.IP.String(), strconv.Itoa(int(endpoint.Port))))
|
|
if err != nil {
|
|
select {
|
|
case <-ctx.Done():
|
|
return nil, ctx.Err()
|
|
default:
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return newMConnConnection(m.logger, tcpConn, m.mConnConfig, m.channelDescs), nil
|
|
}
|
|
|
|
// Close implements Transport.
|
|
func (m *MConnTransport) Close() error {
|
|
var err error
|
|
m.closeOnce.Do(func() {
|
|
close(m.closeCh) // must be closed first, to handle error in Accept()
|
|
if m.listener != nil {
|
|
err = m.listener.Close()
|
|
}
|
|
})
|
|
return err
|
|
}
|
|
|
|
// SetChannels sets the channel descriptors to be used when
|
|
// establishing a connection.
|
|
//
|
|
// FIXME: To be removed when the legacy p2p stack is removed. Channel
|
|
// descriptors should be managed by the router. The underlying transport and
|
|
// connections should be agnostic to everything but the channel ID's which are
|
|
// initialized in the handshake.
|
|
func (m *MConnTransport) AddChannelDescriptors(channelDesc []*ChannelDescriptor) {
|
|
m.channelDescs = append(m.channelDescs, channelDesc...)
|
|
}
|
|
|
|
// validateEndpoint validates an endpoint.
|
|
func (m *MConnTransport) validateEndpoint(endpoint Endpoint) error {
|
|
if err := endpoint.Validate(); err != nil {
|
|
return err
|
|
}
|
|
if endpoint.Protocol != MConnProtocol && endpoint.Protocol != TCPProtocol {
|
|
return fmt.Errorf("unsupported protocol %q", endpoint.Protocol)
|
|
}
|
|
if len(endpoint.IP) == 0 {
|
|
return errors.New("endpoint has no IP address")
|
|
}
|
|
if endpoint.Path != "" {
|
|
return fmt.Errorf("endpoints with path not supported (got %q)", endpoint.Path)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// mConnConnection implements Connection for MConnTransport.
|
|
type mConnConnection struct {
|
|
logger log.Logger
|
|
conn net.Conn
|
|
mConnConfig conn.MConnConfig
|
|
channelDescs []*ChannelDescriptor
|
|
receiveCh chan mConnMessage
|
|
errorCh chan error
|
|
closeCh chan struct{}
|
|
closeOnce sync.Once
|
|
|
|
mconn *conn.MConnection // set during Handshake()
|
|
}
|
|
|
|
// mConnMessage passes MConnection messages through internal channels.
|
|
type mConnMessage struct {
|
|
channelID ChannelID
|
|
payload []byte
|
|
}
|
|
|
|
// newMConnConnection creates a new mConnConnection.
|
|
func newMConnConnection(
|
|
logger log.Logger,
|
|
conn net.Conn,
|
|
mConnConfig conn.MConnConfig,
|
|
channelDescs []*ChannelDescriptor,
|
|
) *mConnConnection {
|
|
return &mConnConnection{
|
|
logger: logger,
|
|
conn: conn,
|
|
mConnConfig: mConnConfig,
|
|
channelDescs: channelDescs,
|
|
receiveCh: make(chan mConnMessage),
|
|
errorCh: make(chan error, 1), // buffered to avoid onError leak
|
|
closeCh: make(chan struct{}),
|
|
}
|
|
}
|
|
|
|
// Handshake implements Connection.
|
|
func (c *mConnConnection) Handshake(
|
|
ctx context.Context,
|
|
nodeInfo types.NodeInfo,
|
|
privKey crypto.PrivKey,
|
|
) (types.NodeInfo, crypto.PubKey, error) {
|
|
var (
|
|
mconn *conn.MConnection
|
|
peerInfo types.NodeInfo
|
|
peerKey crypto.PubKey
|
|
errCh = make(chan error, 1)
|
|
)
|
|
// To handle context cancellation, we need to do the handshake in a
|
|
// goroutine and abort the blocking network calls by closing the connection
|
|
// when the context is canceled.
|
|
go func() {
|
|
// FIXME: Since the MConnection code panics, we need to recover it and turn it
|
|
// into an error. We should remove panics instead.
|
|
defer func() {
|
|
if r := recover(); r != nil {
|
|
errCh <- fmt.Errorf("recovered from panic: %v", r)
|
|
}
|
|
}()
|
|
var err error
|
|
mconn, peerInfo, peerKey, err = c.handshake(ctx, nodeInfo, privKey)
|
|
errCh <- err
|
|
}()
|
|
|
|
select {
|
|
case <-ctx.Done():
|
|
_ = c.Close()
|
|
return types.NodeInfo{}, nil, ctx.Err()
|
|
|
|
case err := <-errCh:
|
|
if err != nil {
|
|
return types.NodeInfo{}, nil, err
|
|
}
|
|
c.mconn = mconn
|
|
c.logger = mconn.Logger
|
|
if err = c.mconn.Start(ctx); err != nil {
|
|
return types.NodeInfo{}, nil, err
|
|
}
|
|
return peerInfo, peerKey, nil
|
|
}
|
|
}
|
|
|
|
// handshake is a helper for Handshake, simplifying error handling so we can
|
|
// keep context handling and panic recovery in Handshake. It returns an
|
|
// unstarted but handshaked MConnection, to avoid concurrent field writes.
|
|
func (c *mConnConnection) handshake(
|
|
ctx context.Context,
|
|
nodeInfo types.NodeInfo,
|
|
privKey crypto.PrivKey,
|
|
) (*conn.MConnection, types.NodeInfo, crypto.PubKey, error) {
|
|
if c.mconn != nil {
|
|
return nil, types.NodeInfo{}, nil, errors.New("connection is already handshaked")
|
|
}
|
|
|
|
secretConn, err := conn.MakeSecretConnection(c.conn, privKey)
|
|
if err != nil {
|
|
return nil, types.NodeInfo{}, nil, err
|
|
}
|
|
|
|
var pbPeerInfo p2pproto.NodeInfo
|
|
errCh := make(chan error, 2)
|
|
go func() {
|
|
_, err := protoio.NewDelimitedWriter(secretConn).WriteMsg(nodeInfo.ToProto())
|
|
errCh <- err
|
|
}()
|
|
go func() {
|
|
_, err := protoio.NewDelimitedReader(secretConn, types.MaxNodeInfoSize()).ReadMsg(&pbPeerInfo)
|
|
errCh <- err
|
|
}()
|
|
for i := 0; i < cap(errCh); i++ {
|
|
if err = <-errCh; err != nil {
|
|
return nil, types.NodeInfo{}, nil, err
|
|
}
|
|
}
|
|
peerInfo, err := types.NodeInfoFromProto(&pbPeerInfo)
|
|
if err != nil {
|
|
return nil, types.NodeInfo{}, nil, err
|
|
}
|
|
|
|
mconn := conn.NewMConnectionWithConfig(
|
|
c.logger.With("peer", c.RemoteEndpoint().NodeAddress(peerInfo.NodeID)),
|
|
secretConn,
|
|
c.channelDescs,
|
|
c.onReceive,
|
|
c.onError,
|
|
c.mConnConfig,
|
|
)
|
|
|
|
return mconn, peerInfo, secretConn.RemotePubKey(), nil
|
|
}
|
|
|
|
// onReceive is a callback for MConnection received messages.
|
|
func (c *mConnConnection) onReceive(chID ChannelID, payload []byte) {
|
|
select {
|
|
case c.receiveCh <- mConnMessage{channelID: chID, payload: payload}:
|
|
case <-c.closeCh:
|
|
}
|
|
}
|
|
|
|
// onError is a callback for MConnection errors. The error is passed via errorCh
|
|
// to ReceiveMessage (but not SendMessage, for legacy P2P stack behavior).
|
|
func (c *mConnConnection) onError(e interface{}) {
|
|
err, ok := e.(error)
|
|
if !ok {
|
|
err = fmt.Errorf("%v", err)
|
|
}
|
|
// We have to close the connection here, since MConnection will have stopped
|
|
// the service on any errors.
|
|
_ = c.Close()
|
|
select {
|
|
case c.errorCh <- err:
|
|
case <-c.closeCh:
|
|
}
|
|
}
|
|
|
|
// String displays connection information.
|
|
func (c *mConnConnection) String() string {
|
|
return c.RemoteEndpoint().String()
|
|
}
|
|
|
|
// SendMessage implements Connection.
|
|
func (c *mConnConnection) SendMessage(chID ChannelID, msg []byte) error {
|
|
if chID > math.MaxUint8 {
|
|
return fmt.Errorf("MConnection only supports 1-byte channel IDs (got %v)", chID)
|
|
}
|
|
select {
|
|
case err := <-c.errorCh:
|
|
return err
|
|
case <-c.closeCh:
|
|
return io.EOF
|
|
default:
|
|
if ok := c.mconn.Send(chID, msg); !ok {
|
|
return errors.New("sending message timed out")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
}
|
|
|
|
// ReceiveMessage implements Connection.
|
|
func (c *mConnConnection) ReceiveMessage() (ChannelID, []byte, error) {
|
|
select {
|
|
case err := <-c.errorCh:
|
|
return 0, nil, err
|
|
case <-c.closeCh:
|
|
return 0, nil, io.EOF
|
|
case msg := <-c.receiveCh:
|
|
return msg.channelID, msg.payload, nil
|
|
}
|
|
}
|
|
|
|
// LocalEndpoint implements Connection.
|
|
func (c *mConnConnection) LocalEndpoint() Endpoint {
|
|
endpoint := Endpoint{
|
|
Protocol: MConnProtocol,
|
|
}
|
|
if addr, ok := c.conn.LocalAddr().(*net.TCPAddr); ok {
|
|
endpoint.IP = addr.IP
|
|
endpoint.Port = uint16(addr.Port)
|
|
}
|
|
return endpoint
|
|
}
|
|
|
|
// RemoteEndpoint implements Connection.
|
|
func (c *mConnConnection) RemoteEndpoint() Endpoint {
|
|
endpoint := Endpoint{
|
|
Protocol: MConnProtocol,
|
|
}
|
|
if addr, ok := c.conn.RemoteAddr().(*net.TCPAddr); ok {
|
|
endpoint.IP = addr.IP
|
|
endpoint.Port = uint16(addr.Port)
|
|
}
|
|
return endpoint
|
|
}
|
|
|
|
// Close implements Connection.
|
|
func (c *mConnConnection) Close() error {
|
|
var err error
|
|
c.closeOnce.Do(func() {
|
|
if c.mconn != nil && c.mconn.IsRunning() {
|
|
err = c.mconn.Stop()
|
|
} else {
|
|
err = c.conn.Close()
|
|
}
|
|
close(c.closeCh)
|
|
})
|
|
return err
|
|
}
|