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server_nat_test.go
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server_nat_test.go
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// Copyright 2023 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 (
"net"
"net/netip"
"sync/atomic"
"testing"
"time"
"github.com/ethereum/go-ethereum/common/mclock"
"github.com/ethereum/go-ethereum/internal/testlog"
"github.com/ethereum/go-ethereum/log"
)
func TestServerPortMapping(t *testing.T) {
clock := new(mclock.Simulated)
mockNAT := &mockNAT{mappedPort: 30000}
srv := Server{
Config: Config{
PrivateKey: newkey(),
NoDial: true,
ListenAddr: ":0",
DiscAddr: ":0",
NAT: mockNAT,
Logger: testlog.Logger(t, log.LvlTrace),
clock: clock,
},
}
err := srv.Start()
if err != nil {
t.Fatal(err)
}
defer srv.Stop()
// Wait for the port mapping to be registered. Synchronization with the port mapping
// goroutine works like this: For each iteration, we allow other goroutines to run and
// also advance the virtual clock by 1 second. Waiting stops when the NAT interface
// has received some requests, or when the clock reaches a timeout.
deadline := clock.Now().Add(portMapRefreshInterval)
for clock.Now() < deadline && mockNAT.mapRequests.Load() < 2 {
time.Sleep(10 * time.Millisecond)
clock.Run(1 * time.Second)
}
if mockNAT.ipRequests.Load() == 0 {
t.Fatal("external IP was never requested")
}
reqCount := mockNAT.mapRequests.Load()
if reqCount != 2 {
t.Error("wrong request count:", reqCount)
}
enr := srv.LocalNode().Node()
if enr.IPAddr() != netip.MustParseAddr("192.0.2.0") {
t.Error("wrong IP in ENR:", enr.IPAddr())
}
if enr.TCP() != 30000 {
t.Error("wrong TCP port in ENR:", enr.TCP())
}
if enr.UDP() != 30000 {
t.Error("wrong UDP port in ENR:", enr.UDP())
}
}
type mockNAT struct {
mappedPort uint16
mapRequests atomic.Int32
unmapRequests atomic.Int32
ipRequests atomic.Int32
}
func (m *mockNAT) AddMapping(protocol string, extport, intport int, name string, lifetime time.Duration) (uint16, error) {
m.mapRequests.Add(1)
return m.mappedPort, nil
}
func (m *mockNAT) DeleteMapping(protocol string, extport, intport int) error {
m.unmapRequests.Add(1)
return nil
}
func (m *mockNAT) ExternalIP() (net.IP, error) {
m.ipRequests.Add(1)
return net.ParseIP("192.0.2.0"), nil
}
func (m *mockNAT) String() string {
return "mockNAT"
}