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-rw-r--r--p2p/handshake.go24
-rw-r--r--p2p/handshake_test.go5
-rw-r--r--p2p/server.go29
-rw-r--r--p2p/server_test.go21
4 files changed, 46 insertions, 33 deletions
diff --git a/p2p/handshake.go b/p2p/handshake.go
index 8e611cfd5..4cdcee6d4 100644
--- a/p2p/handshake.go
+++ b/p2p/handshake.go
@@ -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")
}
diff --git a/p2p/handshake_test.go b/p2p/handshake_test.go
index 9018e14f2..ab75921a3 100644
--- a/p2p/handshake_test.go
+++ b/p2p/handshake_test.go
@@ -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)
}
diff --git a/p2p/server.go b/p2p/server.go
index 77f66f167..0598547e4 100644
--- a/p2p/server.go
+++ b/p2p/server.go
@@ -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.
@@ -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)
@@ -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{
diff --git a/p2p/server_test.go b/p2p/server_test.go
index a5e56fa18..bf9df31ab 100644
--- a/p2p/server_test.go
+++ b/p2p/server_test.go
@@ -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
+}
generated by cgit (git 2.34.1) at 2024-11-12 23:40:39 +0800