Official Go implementation of the Ethereum protocol
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go-ethereum/p2p/server_test.go

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// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package p2p
import (
"crypto/ecdsa"
"crypto/sha256"
"errors"
"io"
"math/rand"
"net"
"reflect"
"testing"
"time"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/internal/testlog"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/p2p/enr"
"github.com/ethereum/go-ethereum/p2p/rlpx"
)
type testTransport struct {
*rlpxTransport
rpub *ecdsa.PublicKey
closeErr error
}
func newTestTransport(rpub *ecdsa.PublicKey, fd net.Conn, dialDest *ecdsa.PublicKey) transport {
wrapped := newRLPX(fd, dialDest).(*rlpxTransport)
wrapped.conn.InitWithSecrets(rlpx.Secrets{
AES: make([]byte, 16),
MAC: make([]byte, 16),
EgressMAC: sha256.New(),
IngressMAC: sha256.New(),
})
return &testTransport{rpub: rpub, rlpxTransport: wrapped}
}
func (c *testTransport) doEncHandshake(prv *ecdsa.PrivateKey) (*ecdsa.PublicKey, error) {
return c.rpub, nil
}
func (c *testTransport) doProtoHandshake(our *protoHandshake) (*protoHandshake, error) {
pubkey := crypto.FromECDSAPub(c.rpub)[1:]
return &protoHandshake{ID: pubkey, Name: "test"}, nil
}
func (c *testTransport) close(err error) {
c.conn.Close()
c.closeErr = err
}
func startTestServer(t *testing.T, remoteKey *ecdsa.PublicKey, pf func(*Peer)) *Server {
config := Config{
Name: "test",
MaxPeers: 10,
ListenAddr: "127.0.0.1:0",
NoDiscovery: true,
PrivateKey: newkey(),
Logger: testlog.Logger(t, log.LvlTrace),
}
server := &Server{
Config: config,
newPeerHook: pf,
newTransport: func(fd net.Conn, dialDest *ecdsa.PublicKey) transport {
return newTestTransport(remoteKey, fd, dialDest)
},
}
if err := server.Start(); err != nil {
t.Fatalf("Could not start server: %v", err)
}
return server
}
func TestServerListen(t *testing.T) {
// start the test server
connected := make(chan *Peer)
remid := &newkey().PublicKey
srv := startTestServer(t, remid, func(p *Peer) {
if p.ID() != enode.PubkeyToIDV4(remid) {
t.Error("peer func called with wrong node id")
}
connected <- p
})
defer close(connected)
defer srv.Stop()
// dial the test server
conn, err := net.DialTimeout("tcp", srv.ListenAddr, 5*time.Second)
if err != nil {
t.Fatalf("could not dial: %v", err)
}
defer conn.Close()
select {
case peer := <-connected:
if peer.LocalAddr().String() != conn.RemoteAddr().String() {
t.Errorf("peer started with wrong conn: got %v, want %v",
peer.LocalAddr(), conn.RemoteAddr())
}
peers := srv.Peers()
if !reflect.DeepEqual(peers, []*Peer{peer}) {
t.Errorf("Peers mismatch: got %v, want %v", peers, []*Peer{peer})
}
case <-time.After(1 * time.Second):
t.Error("server did not accept within one second")
}
}
func TestServerDial(t *testing.T) {
// run a one-shot TCP server to handle the connection.
listener, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatalf("could not setup listener: %v", err)
}
defer listener.Close()
accepted := make(chan net.Conn, 1)
go func() {
conn, err := listener.Accept()
if err != nil {
return
}
accepted <- conn
}()
// start the server
connected := make(chan *Peer)
remid := &newkey().PublicKey
srv := startTestServer(t, remid, func(p *Peer) { connected <- p })
defer close(connected)
defer srv.Stop()
// tell the server to connect
tcpAddr := listener.Addr().(*net.TCPAddr)
node := enode.NewV4(remid, tcpAddr.IP, tcpAddr.Port, 0)
srv.AddPeer(node)
select {
case conn := <-accepted:
defer conn.Close()
select {
case peer := <-connected:
if peer.ID() != enode.PubkeyToIDV4(remid) {
t.Errorf("peer has wrong id")
}
if peer.Name() != "test" {
t.Errorf("peer has wrong name")
}
if peer.RemoteAddr().String() != conn.LocalAddr().String() {
t.Errorf("peer started with wrong conn: got %v, want %v",
peer.RemoteAddr(), conn.LocalAddr())
}
peers := srv.Peers()
if !reflect.DeepEqual(peers, []*Peer{peer}) {
t.Errorf("Peers mismatch: got %v, want %v", peers, []*Peer{peer})
}
// Test AddTrustedPeer/RemoveTrustedPeer and changing Trusted flags
// Particularly for race conditions on changing the flag state.
if peer := srv.Peers()[0]; peer.Info().Network.Trusted {
t.Errorf("peer is trusted prematurely: %v", peer)
}
done := make(chan bool)
go func() {
srv.AddTrustedPeer(node)
if peer := srv.Peers()[0]; !peer.Info().Network.Trusted {
t.Errorf("peer is not trusted after AddTrustedPeer: %v", peer)
}
srv.RemoveTrustedPeer(node)
if peer := srv.Peers()[0]; peer.Info().Network.Trusted {
t.Errorf("peer is trusted after RemoveTrustedPeer: %v", peer)
}
done <- true
}()
// Trigger potential race conditions
peer = srv.Peers()[0]
_ = peer.Inbound()
_ = peer.Info()
<-done
case <-time.After(1 * time.Second):
t.Error("server did not launch peer within one second")
}
case <-time.After(1 * time.Second):
t.Error("server did not connect within one second")
}
}
// This test checks that RemovePeer disconnects the peer if it is connected.
func TestServerRemovePeerDisconnect(t *testing.T) {
srv1 := &Server{Config: Config{
PrivateKey: newkey(),
MaxPeers: 1,
NoDiscovery: true,
Logger: testlog.Logger(t, log.LvlTrace).New("server", "1"),
}}
srv2 := &Server{Config: Config{
PrivateKey: newkey(),
MaxPeers: 1,
NoDiscovery: true,
NoDial: true,
ListenAddr: "127.0.0.1:0",
Logger: testlog.Logger(t, log.LvlTrace).New("server", "2"),
}}
srv1.Start()
defer srv1.Stop()
srv2.Start()
defer srv2.Stop()
if !syncAddPeer(srv1, srv2.Self()) {
t.Fatal("peer not connected")
}
srv1.RemovePeer(srv2.Self())
if srv1.PeerCount() > 0 {
t.Fatal("removed peer still connected")
}
}
// This test checks that connections are disconnected just after the encryption handshake
// when the server is at capacity. Trusted connections should still be accepted.
func TestServerAtCap(t *testing.T) {
trustedNode := newkey()
trustedID := enode.PubkeyToIDV4(&trustedNode.PublicKey)
srv := &Server{
Config: Config{
PrivateKey: newkey(),
MaxPeers: 10,
NoDial: true,
NoDiscovery: true,
TrustedNodes: []*enode.Node{newNode(trustedID, "")},
Logger: testlog.Logger(t, log.LvlTrace),
},
}
if err := srv.Start(); err != nil {
t.Fatalf("could not start: %v", err)
}
defer srv.Stop()
newconn := func(id enode.ID) *conn {
fd, _ := net.Pipe()
tx := newTestTransport(&trustedNode.PublicKey, fd, nil)
node := enode.SignNull(new(enr.Record), id)
return &conn{fd: fd, transport: tx, flags: inboundConn, node: node, cont: make(chan error)}
}
// Inject a few connections to fill up the peer set.
for i := 0; i < 10; i++ {
c := newconn(randomID())
if err := srv.checkpoint(c, srv.checkpointAddPeer); err != nil {
t.Fatalf("could not add conn %d: %v", i, err)
}
}
// Try inserting a non-trusted connection.
anotherID := randomID()
c := newconn(anotherID)
if err := srv.checkpoint(c, srv.checkpointPostHandshake); err != DiscTooManyPeers {
t.Error("wrong error for insert:", err)
}
// Try inserting a trusted connection.
c = newconn(trustedID)
if err := srv.checkpoint(c, srv.checkpointPostHandshake); err != nil {
t.Error("unexpected error for trusted conn @posthandshake:", err)
}
if !c.is(trustedConn) {
t.Error("Server did not set trusted flag")
}
// Remove from trusted set and try again
srv.RemoveTrustedPeer(newNode(trustedID, ""))
c = newconn(trustedID)
if err := srv.checkpoint(c, srv.checkpointPostHandshake); err != DiscTooManyPeers {
t.Error("wrong error for insert:", err)
}
// Add anotherID to trusted set and try again
srv.AddTrustedPeer(newNode(anotherID, ""))
c = newconn(anotherID)
if err := srv.checkpoint(c, srv.checkpointPostHandshake); err != nil {
t.Error("unexpected error for trusted conn @posthandshake:", err)
}
if !c.is(trustedConn) {
t.Error("Server did not set trusted flag")
}
}
func TestServerPeerLimits(t *testing.T) {
srvkey := newkey()
clientkey := newkey()
clientnode := enode.NewV4(&clientkey.PublicKey, nil, 0, 0)
var tp = &setupTransport{
pubkey: &clientkey.PublicKey,
phs: protoHandshake{
ID: crypto.FromECDSAPub(&clientkey.PublicKey)[1:],
// Force "DiscUselessPeer" due to unmatching caps
// Caps: []Cap{discard.cap()},
},
}
srv := &Server{
Config: Config{
PrivateKey: srvkey,
MaxPeers: 0,
NoDial: true,
NoDiscovery: true,
Protocols: []Protocol{discard},
Logger: testlog.Logger(t, log.LvlTrace),
},
newTransport: func(fd net.Conn, dialDest *ecdsa.PublicKey) transport { return tp },
}
if err := srv.Start(); err != nil {
t.Fatalf("couldn't start server: %v", err)
}
defer srv.Stop()
// Check that server is full (MaxPeers=0)
flags := dynDialedConn
dialDest := clientnode
conn, _ := net.Pipe()
srv.SetupConn(conn, flags, dialDest)
if tp.closeErr != DiscTooManyPeers {
t.Errorf("unexpected close error: %q", tp.closeErr)
}
conn.Close()
srv.AddTrustedPeer(clientnode)
// Check that server allows a trusted peer despite being full.
conn, _ = net.Pipe()
srv.SetupConn(conn, flags, dialDest)
if tp.closeErr == DiscTooManyPeers {
t.Errorf("failed to bypass MaxPeers with trusted node: %q", tp.closeErr)
}
if tp.closeErr != DiscUselessPeer {
t.Errorf("unexpected close error: %q", tp.closeErr)
}
conn.Close()
srv.RemoveTrustedPeer(clientnode)
// Check that server is full again.
conn, _ = net.Pipe()
srv.SetupConn(conn, flags, dialDest)
if tp.closeErr != DiscTooManyPeers {
t.Errorf("unexpected close error: %q", tp.closeErr)
}
conn.Close()
}
func TestServerSetupConn(t *testing.T) {
var (
clientkey, srvkey = newkey(), newkey()
clientpub = &clientkey.PublicKey
srvpub = &srvkey.PublicKey
)
tests := []struct {
dontstart bool
tt *setupTransport
flags connFlag
dialDest *enode.Node
wantCloseErr error
wantCalls string
}{
{
dontstart: true,
tt: &setupTransport{pubkey: clientpub},
wantCalls: "close,",
wantCloseErr: errServerStopped,
},
{
tt: &setupTransport{pubkey: clientpub, encHandshakeErr: errEncHandshakeError},
flags: inboundConn,
wantCalls: "doEncHandshake,close,",
wantCloseErr: errEncHandshakeError,
},
{
tt: &setupTransport{pubkey: clientpub, phs: protoHandshake{ID: randomID().Bytes()}},
dialDest: enode.NewV4(clientpub, nil, 0, 0),
flags: dynDialedConn,
wantCalls: "doEncHandshake,doProtoHandshake,close,",
wantCloseErr: DiscUnexpectedIdentity,
},
{
tt: &setupTransport{pubkey: clientpub, protoHandshakeErr: errProtoHandshakeError},
dialDest: enode.NewV4(clientpub, nil, 0, 0),
flags: dynDialedConn,
wantCalls: "doEncHandshake,doProtoHandshake,close,",
wantCloseErr: errProtoHandshakeError,
},
{
tt: &setupTransport{pubkey: srvpub, phs: protoHandshake{ID: crypto.FromECDSAPub(srvpub)[1:]}},
flags: inboundConn,
wantCalls: "doEncHandshake,close,",
wantCloseErr: DiscSelf,
},
{
tt: &setupTransport{pubkey: clientpub, phs: protoHandshake{ID: crypto.FromECDSAPub(clientpub)[1:]}},
flags: inboundConn,
wantCalls: "doEncHandshake,doProtoHandshake,close,",
wantCloseErr: DiscUselessPeer,
},
}
for i, test := range tests {
t.Run(test.wantCalls, func(t *testing.T) {
cfg := Config{
PrivateKey: srvkey,
MaxPeers: 10,
NoDial: true,
NoDiscovery: true,
Protocols: []Protocol{discard},
Logger: testlog.Logger(t, log.LvlTrace),
}
srv := &Server{
Config: cfg,
newTransport: func(fd net.Conn, dialDest *ecdsa.PublicKey) transport { return test.tt },
log: cfg.Logger,
}
if !test.dontstart {
if err := srv.Start(); err != nil {
t.Fatalf("couldn't start server: %v", err)
}
defer srv.Stop()
}
p1, _ := net.Pipe()
srv.SetupConn(p1, test.flags, test.dialDest)
if !errors.Is(test.tt.closeErr, test.wantCloseErr) {
t.Errorf("test %d: close error mismatch: got %q, want %q", i, test.tt.closeErr, test.wantCloseErr)
}
if test.tt.calls != test.wantCalls {
t.Errorf("test %d: calls mismatch: got %q, want %q", i, test.tt.calls, test.wantCalls)
}
})
}
}
type setupTransport struct {
pubkey *ecdsa.PublicKey
encHandshakeErr error
phs protoHandshake
protoHandshakeErr error
calls string
closeErr error
}
func (c *setupTransport) doEncHandshake(prv *ecdsa.PrivateKey) (*ecdsa.PublicKey, error) {
c.calls += "doEncHandshake,"
return c.pubkey, c.encHandshakeErr
}
func (c *setupTransport) doProtoHandshake(our *protoHandshake) (*protoHandshake, error) {
c.calls += "doProtoHandshake,"
if c.protoHandshakeErr != nil {
return nil, c.protoHandshakeErr
}
return &c.phs, nil
}
func (c *setupTransport) close(err error) {
c.calls += "close,"
c.closeErr = err
}
// setupConn shouldn't write to/read from the connection.
func (c *setupTransport) WriteMsg(Msg) error {
panic("WriteMsg called on setupTransport")
}
func (c *setupTransport) ReadMsg() (Msg, error) {
panic("ReadMsg called on setupTransport")
}
func newkey() *ecdsa.PrivateKey {
key, err := crypto.GenerateKey()
if err != nil {
panic("couldn't generate key: " + err.Error())
}
return key
}
func randomID() (id enode.ID) {
for i := range id {
id[i] = byte(rand.Intn(255))
}
return id
}
// This test checks that inbound connections are throttled by IP.
func TestServerInboundThrottle(t *testing.T) {
const timeout = 5 * time.Second
newTransportCalled := make(chan struct{})
srv := &Server{
Config: Config{
PrivateKey: newkey(),
ListenAddr: "127.0.0.1:0",
MaxPeers: 10,
NoDial: true,
NoDiscovery: true,
Protocols: []Protocol{discard},
Logger: testlog.Logger(t, log.LvlTrace),
},
newTransport: func(fd net.Conn, dialDest *ecdsa.PublicKey) transport {
newTransportCalled <- struct{}{}
return newRLPX(fd, dialDest)
},
listenFunc: func(network, laddr string) (net.Listener, error) {
fakeAddr := &net.TCPAddr{IP: net.IP{95, 33, 21, 2}, Port: 4444}
return listenFakeAddr(network, laddr, fakeAddr)
},
}
if err := srv.Start(); err != nil {
t.Fatal("can't start: ", err)
}
defer srv.Stop()
// Dial the test server.
conn, err := net.DialTimeout("tcp", srv.ListenAddr, timeout)
if err != nil {
t.Fatalf("could not dial: %v", err)
}
select {
case <-newTransportCalled:
// OK
case <-time.After(timeout):
t.Error("newTransport not called")
}
conn.Close()
// Dial again. This time the server should close the connection immediately.
connClosed := make(chan struct{}, 1)
conn, err = net.DialTimeout("tcp", srv.ListenAddr, timeout)
if err != nil {
t.Fatalf("could not dial: %v", err)
}
defer conn.Close()
go func() {
conn.SetDeadline(time.Now().Add(timeout))
buf := make([]byte, 10)
if n, err := conn.Read(buf); err != io.EOF || n != 0 {
t.Errorf("expected io.EOF and n == 0, got error %q and n == %d", err, n)
}
connClosed <- struct{}{}
}()
select {
case <-connClosed:
// OK
case <-newTransportCalled:
t.Error("newTransport called for second attempt")
case <-time.After(timeout):
t.Error("connection not closed within timeout")
}
}
func listenFakeAddr(network, laddr string, remoteAddr net.Addr) (net.Listener, error) {
l, err := net.Listen(network, laddr)
if err == nil {
l = &fakeAddrListener{l, remoteAddr}
}
return l, err
}
// fakeAddrListener is a listener that creates connections with a mocked remote address.
type fakeAddrListener struct {
net.Listener
remoteAddr net.Addr
}
type fakeAddrConn struct {
net.Conn
remoteAddr net.Addr
}
func (l *fakeAddrListener) Accept() (net.Conn, error) {
c, err := l.Listener.Accept()
if err != nil {
return nil, err
}
return &fakeAddrConn{c, l.remoteAddr}, nil
}
func (c *fakeAddrConn) RemoteAddr() net.Addr {
return c.remoteAddr
}
func syncAddPeer(srv *Server, node *enode.Node) bool {
var (
ch = make(chan *PeerEvent)
sub = srv.SubscribeEvents(ch)
timeout = time.After(2 * time.Second)
)
defer sub.Unsubscribe()
srv.AddPeer(node)
for {
select {
case ev := <-ch:
if ev.Type == PeerEventTypeAdd && ev.Peer == node.ID() {
return true
}
case <-timeout:
return false
}
}
}