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Merge pull request #885 from fjl/p2p-fixes 

p2p: more last-minute fixes
This commit is contained in:
Jeffrey Wilcke 2015-05-08 07:47:56 -07:00
parent 23454dcfcb d4f0a67323
commit 7c678554b5
6 changed files with 69 additions and 39 deletions
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2
cmd/utils/flags.go
View File

@ -195,7 +195,7 @@ var (
MaxPeersFlag = cli.IntFlag{
Name: "maxpeers",
Usage: "Maximum number of network peers (network disabled if set to 0)",
Value: 16,
Value: 25,
}
MaxPendingPeersFlag = cli.IntFlag{
Name: "maxpendpeers",

24
p2p/handshake.go
View File

@ -65,26 +65,26 @@ type protoHandshake struct {
ID discover.NodeID
}
// setupConn starts a protocol session on the given connection.
// It runs the encryption handshake and the protocol handshake.
// If dial is non-nil, the connection the local node is the initiator.
// If atcap is true, the connection will be disconnected with DiscTooManyPeers
// after the key exchange.
func setupConn(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, dial *discover.Node, atcap bool, trusted map[discover.NodeID]bool) (*conn, error) {
// setupConn starts a protocol session on the given connection. It
// runs the encryption handshake and the protocol handshake. If dial
// is non-nil, the connection the local node is the initiator. If
// keepconn returns false, the connection will be disconnected with
// DiscTooManyPeers after the key exchange.
func setupConn(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, dial *discover.Node, keepconn func(discover.NodeID) bool) (*conn, error) {
if dial == nil {
return setupInboundConn(fd, prv, our, atcap, trusted)
return setupInboundConn(fd, prv, our, keepconn)
} else {
return setupOutboundConn(fd, prv, our, dial, atcap, trusted)
return setupOutboundConn(fd, prv, our, dial, keepconn)
}
}
func setupInboundConn(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, atcap bool, trusted map[discover.NodeID]bool) (*conn, error) {
func setupInboundConn(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, keepconn func(discover.NodeID) bool) (*conn, error) {
secrets, err := receiverEncHandshake(fd, prv, nil)
if err != nil {
return nil, fmt.Errorf("encryption handshake failed: %v", err)
}
rw := newRlpxFrameRW(fd, secrets)
if atcap && !trusted[secrets.RemoteID] {
if !keepconn(secrets.RemoteID) {
SendItems(rw, discMsg, DiscTooManyPeers)
return nil, errors.New("we have too many peers")
}
@ -99,13 +99,13 @@ func setupInboundConn(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, a
return &conn{rw, rhs}, nil
}
func setupOutboundConn(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, dial *discover.Node, atcap bool, trusted map[discover.NodeID]bool) (*conn, error) {
func setupOutboundConn(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, dial *discover.Node, keepconn func(discover.NodeID) bool) (*conn, error) {
secrets, err := initiatorEncHandshake(fd, prv, dial.ID, nil)
if err != nil {
return nil, fmt.Errorf("encryption handshake failed: %v", err)
}
rw := newRlpxFrameRW(fd, secrets)
if atcap && !trusted[secrets.RemoteID] {
if !keepconn(secrets.RemoteID) {
SendItems(rw, discMsg, DiscTooManyPeers)
return nil, errors.New("we have too many peers")
}

5
p2p/handshake_test.go
View File

@ -141,9 +141,10 @@ func TestSetupConn(t *testing.T) {
fd0, fd1 := net.Pipe()
done := make(chan struct{})
keepalways := func(discover.NodeID) bool { return true }
go func() {
defer close(done)
conn0, err := setupConn(fd0, prv0, hs0, node1, false, nil)
conn0, err := setupConn(fd0, prv0, hs0, node1, keepalways)
if err != nil {
t.Errorf("outbound side error: %v", err)
return
@ -156,7 +157,7 @@ func TestSetupConn(t *testing.T) {
}
}()
conn1, err := setupConn(fd1, prv1, hs1, nil, false, nil)
conn1, err := setupConn(fd1, prv1, hs1, nil, keepalways)
if err != nil {
t.Fatalf("inbound side error: %v", err)
}

12
p2p/peer.go
View File

@ -211,6 +211,18 @@ func (p *Peer) handle(msg Msg) error {
return nil
}
func countMatchingProtocols(protocols []Protocol, caps []Cap) int {
n := 0
for _, cap := range caps {
for _, proto := range protocols {
if proto.Name == cap.Name && proto.Version == cap.Version {
n++
}
}
}
return n
}
// matchProtocols creates structures for matching named subprotocols.
func matchProtocols(protocols []Protocol, caps []Cap, rw MsgReadWriter) map[string]*protoRW {
sort.Sort(capsByName(caps))

44
p2p/server.go
View File

@ -126,7 +126,7 @@ type Server struct {
peerWG sync.WaitGroup // active peer goroutines
}
type setupFunc func(net.Conn, *ecdsa.PrivateKey, *protoHandshake, *discover.Node, bool, map[discover.NodeID]bool) (*conn, error)
type setupFunc func(net.Conn, *ecdsa.PrivateKey, *protoHandshake, *discover.Node, func(discover.NodeID) bool) (*conn, error)
type newPeerHook func(*Peer)
// Peers returns all connected peers.
@ -412,7 +412,7 @@ func (srv *Server) dialLoop() {
defer refresh.Stop()
// Limit the number of concurrent dials
tokens := maxAcceptConns
tokens := maxDialingConns
if srv.MaxPendingPeers > 0 {
tokens = srv.MaxPendingPeers
}
@ -506,17 +506,7 @@ func (srv *Server) startPeer(fd net.Conn, dest *discover.Node) {
// the callers of startPeer added the peer to the wait group already.
fd.SetDeadline(time.Now().Add(handshakeTimeout))
// Check capacity, but override for static nodes
srv.lock.RLock()
atcap := len(srv.peers) == srv.MaxPeers
if dest != nil {
if _, ok := srv.staticNodes[dest.ID]; ok {
atcap = false
}
}
srv.lock.RUnlock()
conn, err := srv.setupFunc(fd, srv.PrivateKey, srv.ourHandshake, dest, atcap, srv.trustedNodes)
conn, err := srv.setupFunc(fd, srv.PrivateKey, srv.ourHandshake, dest, srv.keepconn)
if err != nil {
fd.Close()
glog.V(logger.Debug).Infof("Handshake with %v failed: %v", fd.RemoteAddr(), err)
@ -528,7 +518,7 @@ func (srv *Server) startPeer(fd net.Conn, dest *discover.Node) {
conn: fd, rtimeout: frameReadTimeout, wtimeout: frameWriteTimeout,
}
p := newPeer(fd, conn, srv.Protocols)
if ok, reason := srv.addPeer(conn.ID, p); !ok {
if ok, reason := srv.addPeer(conn, p); !ok {
glog.V(logger.Detail).Infof("Not adding %v (%v)\n", p, reason)
p.politeDisconnect(reason)
srv.peerWG.Done()
@ -539,6 +529,21 @@ func (srv *Server) startPeer(fd net.Conn, dest *discover.Node) {
go srv.runPeer(p)
}
// preflight checks whether a connection should be kept. it runs
// after the encryption handshake, as soon as the remote identity is
// known.
func (srv *Server) keepconn(id discover.NodeID) bool {
srv.lock.RLock()
defer srv.lock.RUnlock()
if _, ok := srv.staticNodes[id]; ok {
return true // static nodes are always allowed
}
if _, ok := srv.trustedNodes[id]; ok {
return true // trusted nodes are always allowed
}
return len(srv.peers) < srv.MaxPeers
}
func (srv *Server) runPeer(p *Peer) {
glog.V(logger.Debug).Infof("Added %v\n", p)
srvjslog.LogJson(&logger.P2PConnected{
@ -559,13 +564,18 @@ func (srv *Server) runPeer(p *Peer) {
})
}
func (srv *Server) addPeer(id discover.NodeID, p *Peer) (bool, DiscReason) {
func (srv *Server) addPeer(conn *conn, p *Peer) (bool, DiscReason) {
// drop connections with no matching protocols.
if len(srv.Protocols) > 0 && countMatchingProtocols(srv.Protocols, conn.protoHandshake.Caps) == 0 {
return false, DiscUselessPeer
}
// add the peer if it passes the other checks.
srv.lock.Lock()
defer srv.lock.Unlock()
if ok, reason := srv.checkPeer(id); !ok {
if ok, reason := srv.checkPeer(conn.ID); !ok {
return false, reason
}
srv.peers[id] = p
srv.peers[conn.ID] = p
return true, 0
}

21
p2p/server_test.go
View File

@ -22,8 +22,11 @@ func startTestServer(t *testing.T, pf newPeerHook) *Server {
ListenAddr: "127.0.0.1:0",
PrivateKey: newkey(),
newPeerHook: pf,
setupFunc: func(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, dial *discover.Node, atcap bool, trusted map[discover.NodeID]bool) (*conn, error) {
setupFunc: func(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, dial *discover.Node, keepconn func(discover.NodeID) bool) (*conn, error) {
id := randomID()
if !keepconn(id) {
return nil, DiscAlreadyConnected
}
rw := newRlpxFrameRW(fd, secrets{
MAC: zero16,
AES: zero16,
@ -200,7 +203,7 @@ func TestServerDisconnectAtCap(t *testing.T) {
// Run the handshakes just like a real peer would.
key := newkey()
hs := &protoHandshake{Version: baseProtocolVersion, ID: discover.PubkeyID(&key.PublicKey)}
_, err = setupConn(conn, key, hs, srv.Self(), false, srv.trustedNodes)
_, err = setupConn(conn, key, hs, srv.Self(), keepalways)
if i == nconns-1 {
// When handling the last connection, the server should
// disconnect immediately instead of running the protocol
@ -250,7 +253,7 @@ func TestServerStaticPeers(t *testing.T) {
// Run the handshakes just like a real peer would, and wait for completion
key := newkey()
shake := &protoHandshake{Version: baseProtocolVersion, ID: discover.PubkeyID(&key.PublicKey)}
if _, err = setupConn(conn, key, shake, server.Self(), false, server.trustedNodes); err != nil {
if _, err = setupConn(conn, key, shake, server.Self(), keepalways); err != nil {
t.Fatalf("conn %d: unexpected error: %v", i, err)
}
<-started
@ -344,7 +347,7 @@ func TestServerTrustedPeers(t *testing.T) {
// Run the handshakes just like a real peer would, and wait for completion
key := newkey()
shake := &protoHandshake{Version: baseProtocolVersion, ID: discover.PubkeyID(&key.PublicKey)}
if _, err = setupConn(conn, key, shake, server.Self(), false, server.trustedNodes); err != nil {
if _, err = setupConn(conn, key, shake, server.Self(), keepalways); err != nil {
t.Fatalf("conn %d: unexpected error: %v", i, err)
}
<-started
@ -357,7 +360,7 @@ func TestServerTrustedPeers(t *testing.T) {
defer conn.Close()
shake := &protoHandshake{Version: baseProtocolVersion, ID: trusted.ID}
if _, err = setupConn(conn, key, shake, server.Self(), false, server.trustedNodes); err != nil {
if _, err = setupConn(conn, key, shake, server.Self(), keepalways); err != nil {
t.Fatalf("trusted node: unexpected error: %v", err)
}
select {
@ -472,7 +475,7 @@ func TestServerMaxPendingAccepts(t *testing.T) {
go func() {
key := newkey()
shake := &protoHandshake{Version: baseProtocolVersion, ID: discover.PubkeyID(&key.PublicKey)}
if _, err := setupConn(conns[1], key, shake, server.Self(), false, server.trustedNodes); err != nil {
if _, err := setupConn(conns[1], key, shake, server.Self(), keepalways); err != nil {
t.Fatalf("failed to run handshake: %v", err)
}
}()
@ -486,7 +489,7 @@ func TestServerMaxPendingAccepts(t *testing.T) {
go func() {
key := newkey()
shake := &protoHandshake{Version: baseProtocolVersion, ID: discover.PubkeyID(&key.PublicKey)}
if _, err := setupConn(conns[0], key, shake, server.Self(), false, server.trustedNodes); err != nil {
if _, err := setupConn(conns[0], key, shake, server.Self(), keepalways); err != nil {
t.Fatalf("failed to run handshake: %v", err)
}
}()
@ -513,3 +516,7 @@ func randomID() (id discover.NodeID) {
}
return id
}
func keepalways(id discover.NodeID) bool {
return true
}