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508 lines
12 KiB
508 lines
12 KiB
package p2p
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import (
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"context"
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"fmt"
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"net"
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"time"
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"github.com/tendermint/tendermint/crypto"
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"github.com/tendermint/tendermint/p2p/conn"
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)
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const (
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defaultDialTimeout = time.Second
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defaultFilterTimeout = 5 * time.Second
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defaultHandshakeTimeout = 3 * time.Second
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)
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// IPResolver is a behaviour subset of net.Resolver.
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type IPResolver interface {
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LookupIPAddr(context.Context, string) ([]net.IPAddr, error)
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}
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// accept is the container to carry the upgraded connection and NodeInfo from an
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// asynchronously running routine to the Accept method.
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type accept struct {
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conn net.Conn
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nodeInfo NodeInfo
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err error
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}
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// peerConfig is used to bundle data we need to fully setup a Peer with an
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// MConn, provided by the caller of Accept and Dial (currently the Switch). This
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// a temporary measure until reactor setup is less dynamic and we introduce the
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// concept of PeerBehaviour to communicate about significant Peer lifecycle
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// events.
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// TODO(xla): Refactor out with more static Reactor setup and PeerBehaviour.
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type peerConfig struct {
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chDescs []*conn.ChannelDescriptor
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onPeerError func(Peer, interface{})
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outbound, persistent bool
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reactorsByCh map[byte]Reactor
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metrics *Metrics
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}
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// Transport emits and connects to Peers. The implementation of Peer is left to
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// the transport. Each transport is also responsible to filter establishing
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// peers specific to its domain.
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type Transport interface {
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// Accept returns a newly connected Peer.
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Accept(peerConfig) (Peer, error)
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// Dial connects to the Peer for the address.
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Dial(NetAddress, peerConfig) (Peer, error)
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// Cleanup any resources associated with Peer.
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Cleanup(Peer)
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}
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// transportLifecycle bundles the methods for callers to control start and stop
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// behaviour.
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type transportLifecycle interface {
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Close() error
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Listen(NetAddress) error
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}
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// ConnFilterFunc to be implemented by filter hooks after a new connection has
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// been established. The set of exisiting connections is passed along together
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// with all resolved IPs for the new connection.
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type ConnFilterFunc func(ConnSet, net.Conn, []net.IP) error
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// ConnDuplicateIPFilter resolves and keeps all ips for an incoming connection
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// and refuses new ones if they come from a known ip.
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func ConnDuplicateIPFilter() ConnFilterFunc {
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return func(cs ConnSet, c net.Conn, ips []net.IP) error {
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for _, ip := range ips {
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if cs.HasIP(ip) {
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return ErrRejected{
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conn: c,
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err: fmt.Errorf("IP<%v> already connected", ip),
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isDuplicate: true,
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}
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}
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}
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return nil
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}
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}
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// MultiplexTransportOption sets an optional parameter on the
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// MultiplexTransport.
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type MultiplexTransportOption func(*MultiplexTransport)
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// MultiplexTransportConnFilters sets the filters for rejection new connections.
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func MultiplexTransportConnFilters(
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filters ...ConnFilterFunc,
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) MultiplexTransportOption {
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return func(mt *MultiplexTransport) { mt.connFilters = filters }
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}
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// MultiplexTransportFilterTimeout sets the timeout waited for filter calls to
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// return.
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func MultiplexTransportFilterTimeout(
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timeout time.Duration,
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) MultiplexTransportOption {
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return func(mt *MultiplexTransport) { mt.filterTimeout = timeout }
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}
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// MultiplexTransportResolver sets the Resolver used for ip lokkups, defaults to
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// net.DefaultResolver.
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func MultiplexTransportResolver(resolver IPResolver) MultiplexTransportOption {
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return func(mt *MultiplexTransport) { mt.resolver = resolver }
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}
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// MultiplexTransport accepts and dials tcp connections and upgrades them to
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// multiplexed peers.
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type MultiplexTransport struct {
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listener net.Listener
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acceptc chan accept
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closec chan struct{}
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// Lookup table for duplicate ip and id checks.
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conns ConnSet
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connFilters []ConnFilterFunc
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dialTimeout time.Duration
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filterTimeout time.Duration
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handshakeTimeout time.Duration
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nodeInfo NodeInfo
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nodeKey NodeKey
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resolver IPResolver
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// TODO(xla): This config is still needed as we parameterise peerConn and
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// peer currently. All relevant configuration should be refactored into options
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// with sane defaults.
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mConfig conn.MConnConfig
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}
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// Test multiplexTransport for interface completeness.
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var _ Transport = (*MultiplexTransport)(nil)
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var _ transportLifecycle = (*MultiplexTransport)(nil)
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// NewMultiplexTransport returns a tcp connected multiplexed peer.
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func NewMultiplexTransport(
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nodeInfo NodeInfo,
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nodeKey NodeKey,
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mConfig conn.MConnConfig,
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) *MultiplexTransport {
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return &MultiplexTransport{
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acceptc: make(chan accept),
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closec: make(chan struct{}),
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dialTimeout: defaultDialTimeout,
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filterTimeout: defaultFilterTimeout,
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handshakeTimeout: defaultHandshakeTimeout,
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mConfig: mConfig,
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nodeInfo: nodeInfo,
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nodeKey: nodeKey,
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conns: NewConnSet(),
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resolver: net.DefaultResolver,
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}
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}
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// Accept implements Transport.
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func (mt *MultiplexTransport) Accept(cfg peerConfig) (Peer, error) {
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select {
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// This case should never have any side-effectful/blocking operations to
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// ensure that quality peers are ready to be used.
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case a := <-mt.acceptc:
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if a.err != nil {
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return nil, a.err
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}
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cfg.outbound = false
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return mt.wrapPeer(a.conn, a.nodeInfo, cfg, nil), nil
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case <-mt.closec:
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return nil, &ErrTransportClosed{}
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}
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}
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// Dial implements Transport.
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func (mt *MultiplexTransport) Dial(
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addr NetAddress,
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cfg peerConfig,
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) (Peer, error) {
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c, err := addr.DialTimeout(mt.dialTimeout)
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if err != nil {
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return nil, err
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}
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// TODO(xla): Evaluate if we should apply filters if we explicitly dial.
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if err := mt.filterConn(c); err != nil {
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return nil, err
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}
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secretConn, nodeInfo, err := mt.upgrade(c)
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if err != nil {
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return nil, err
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}
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cfg.outbound = true
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p := mt.wrapPeer(secretConn, nodeInfo, cfg, &addr)
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return p, nil
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}
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// Close implements transportLifecycle.
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func (mt *MultiplexTransport) Close() error {
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close(mt.closec)
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if mt.listener != nil {
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return mt.listener.Close()
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}
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return nil
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}
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// Listen implements transportLifecycle.
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func (mt *MultiplexTransport) Listen(addr NetAddress) error {
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ln, err := net.Listen("tcp", addr.DialString())
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if err != nil {
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return err
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}
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mt.listener = ln
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go mt.acceptPeers()
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return nil
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}
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func (mt *MultiplexTransport) acceptPeers() {
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for {
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c, err := mt.listener.Accept()
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if err != nil {
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// If Close() has been called, silently exit.
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select {
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case _, ok := <-mt.closec:
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if !ok {
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return
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}
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default:
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// Transport is not closed
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}
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mt.acceptc <- accept{err: err}
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return
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}
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// Connection upgrade and filtering should be asynchronous to avoid
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// Head-of-line blocking[0].
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// Reference: https://github.com/tendermint/tendermint/issues/2047
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//
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// [0] https://en.wikipedia.org/wiki/Head-of-line_blocking
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go func(c net.Conn) {
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var (
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nodeInfo NodeInfo
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secretConn *conn.SecretConnection
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)
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err := mt.filterConn(c)
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if err == nil {
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secretConn, nodeInfo, err = mt.upgrade(c)
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}
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select {
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case mt.acceptc <- accept{secretConn, nodeInfo, err}:
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// Make the upgraded peer available.
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case <-mt.closec:
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// Give up if the transport was closed.
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_ = c.Close()
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return
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}
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}(c)
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}
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}
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// Cleanup removes the given address from the connections set and
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// closes the connection.
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func (mt *MultiplexTransport) Cleanup(peer Peer) {
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mt.conns.RemoveAddr(peer.RemoteAddr())
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_ = peer.CloseConn()
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}
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func (mt *MultiplexTransport) cleanup(c net.Conn) error {
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mt.conns.Remove(c)
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return c.Close()
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}
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func (mt *MultiplexTransport) filterConn(c net.Conn) (err error) {
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defer func() {
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if err != nil {
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_ = c.Close()
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}
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}()
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// Reject if connection is already present.
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if mt.conns.Has(c) {
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return ErrRejected{conn: c, isDuplicate: true}
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}
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// Resolve ips for incoming conn.
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ips, err := resolveIPs(mt.resolver, c)
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if err != nil {
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return err
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}
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errc := make(chan error, len(mt.connFilters))
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for _, f := range mt.connFilters {
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go func(f ConnFilterFunc, c net.Conn, ips []net.IP, errc chan<- error) {
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errc <- f(mt.conns, c, ips)
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}(f, c, ips, errc)
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}
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for i := 0; i < cap(errc); i++ {
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select {
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case err := <-errc:
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if err != nil {
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return ErrRejected{conn: c, err: err, isFiltered: true}
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}
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case <-time.After(mt.filterTimeout):
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return ErrFilterTimeout{}
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}
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}
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mt.conns.Set(c, ips)
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return nil
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}
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func (mt *MultiplexTransport) upgrade(
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c net.Conn,
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) (secretConn *conn.SecretConnection, nodeInfo NodeInfo, err error) {
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defer func() {
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if err != nil {
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_ = mt.cleanup(c)
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}
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}()
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secretConn, err = upgradeSecretConn(c, mt.handshakeTimeout, mt.nodeKey.PrivKey)
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if err != nil {
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return nil, nil, ErrRejected{
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conn: c,
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err: fmt.Errorf("secrect conn failed: %v", err),
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isAuthFailure: true,
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}
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}
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nodeInfo, err = handshake(secretConn, mt.handshakeTimeout, mt.nodeInfo)
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if err != nil {
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return nil, nil, ErrRejected{
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conn: c,
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err: fmt.Errorf("handshake failed: %v", err),
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isAuthFailure: true,
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}
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}
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if err := nodeInfo.Validate(); err != nil {
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return nil, nil, ErrRejected{
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conn: c,
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err: err,
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isNodeInfoInvalid: true,
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}
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}
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// Ensure connection key matches self reported key.
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if connID := PubKeyToID(secretConn.RemotePubKey()); connID != nodeInfo.ID() {
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return nil, nil, ErrRejected{
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conn: c,
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id: connID,
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err: fmt.Errorf(
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"conn.ID (%v) NodeInfo.ID (%v) missmatch",
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connID,
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nodeInfo.ID(),
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),
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isAuthFailure: true,
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}
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}
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// Reject self.
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if mt.nodeInfo.ID() == nodeInfo.ID() {
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return nil, nil, ErrRejected{
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addr: *NewNetAddress(nodeInfo.ID(), c.RemoteAddr()),
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conn: c,
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id: nodeInfo.ID(),
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isSelf: true,
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}
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}
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if err := mt.nodeInfo.CompatibleWith(nodeInfo); err != nil {
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return nil, nil, ErrRejected{
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conn: c,
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err: err,
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id: nodeInfo.ID(),
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isIncompatible: true,
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}
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}
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return secretConn, nodeInfo, nil
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}
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func (mt *MultiplexTransport) wrapPeer(
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c net.Conn,
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ni NodeInfo,
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cfg peerConfig,
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dialedAddr *NetAddress,
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) Peer {
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peerConn := newPeerConn(
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cfg.outbound,
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cfg.persistent,
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c,
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dialedAddr,
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)
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p := newPeer(
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peerConn,
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mt.mConfig,
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ni,
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cfg.reactorsByCh,
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cfg.chDescs,
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cfg.onPeerError,
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PeerMetrics(cfg.metrics),
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)
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return p
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}
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func handshake(
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c net.Conn,
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timeout time.Duration,
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nodeInfo NodeInfo,
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) (NodeInfo, error) {
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if err := c.SetDeadline(time.Now().Add(timeout)); err != nil {
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return nil, err
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}
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var (
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errc = make(chan error, 2)
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peerNodeInfo DefaultNodeInfo
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ourNodeInfo = nodeInfo.(DefaultNodeInfo)
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)
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go func(errc chan<- error, c net.Conn) {
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_, err := cdc.MarshalBinaryLengthPrefixedWriter(c, ourNodeInfo)
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errc <- err
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}(errc, c)
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go func(errc chan<- error, c net.Conn) {
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_, err := cdc.UnmarshalBinaryLengthPrefixedReader(
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c,
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&peerNodeInfo,
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int64(MaxNodeInfoSize()),
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)
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errc <- err
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}(errc, c)
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for i := 0; i < cap(errc); i++ {
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err := <-errc
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if err != nil {
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return nil, err
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}
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}
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return peerNodeInfo, c.SetDeadline(time.Time{})
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}
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func upgradeSecretConn(
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c net.Conn,
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timeout time.Duration,
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privKey crypto.PrivKey,
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) (*conn.SecretConnection, error) {
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if err := c.SetDeadline(time.Now().Add(timeout)); err != nil {
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return nil, err
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}
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sc, err := conn.MakeSecretConnection(c, privKey)
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if err != nil {
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return nil, err
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}
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return sc, sc.SetDeadline(time.Time{})
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}
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func resolveIPs(resolver IPResolver, c net.Conn) ([]net.IP, error) {
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host, _, err := net.SplitHostPort(c.RemoteAddr().String())
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if err != nil {
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return nil, err
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}
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addrs, err := resolver.LookupIPAddr(context.Background(), host)
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if err != nil {
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return nil, err
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}
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ips := []net.IP{}
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for _, addr := range addrs {
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ips = append(ips, addr.IP)
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}
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return ips, nil
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}
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