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459 lines
13 KiB
459 lines
13 KiB
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package discover
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import (
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"crypto/ecdsa"
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"fmt"
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"math/rand"
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"net"
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"reflect"
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"testing"
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"testing/quick"
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"time"
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"github.com/ethereum/go-ethereum/common/mclock"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/internal/testlog"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/p2p/enode"
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"github.com/ethereum/go-ethereum/p2p/enr"
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"github.com/ethereum/go-ethereum/p2p/netutil"
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)
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func TestTable_pingReplace(t *testing.T) {
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run := func(newNodeResponding, lastInBucketResponding bool) {
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name := fmt.Sprintf("newNodeResponding=%t/lastInBucketResponding=%t", newNodeResponding, lastInBucketResponding)
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t.Run(name, func(t *testing.T) {
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t.Parallel()
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testPingReplace(t, newNodeResponding, lastInBucketResponding)
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})
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}
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run(true, true)
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run(false, true)
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run(true, false)
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run(false, false)
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}
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func testPingReplace(t *testing.T, newNodeIsResponding, lastInBucketIsResponding bool) {
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simclock := new(mclock.Simulated)
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transport := newPingRecorder()
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tab, db := newTestTable(transport, Config{
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Clock: simclock,
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Log: testlog.Logger(t, log.LevelTrace),
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})
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defer db.Close()
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defer tab.close()
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<-tab.initDone
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// Fill up the sender's bucket.
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replacementNodeKey, _ := crypto.HexToECDSA("45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8")
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replacementNode := wrapNode(enode.NewV4(&replacementNodeKey.PublicKey, net.IP{127, 0, 0, 1}, 99, 99))
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last := fillBucket(tab, replacementNode.ID())
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tab.mutex.Lock()
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nodeEvents := newNodeEventRecorder(128)
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tab.nodeAddedHook = nodeEvents.nodeAdded
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tab.nodeRemovedHook = nodeEvents.nodeRemoved
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tab.mutex.Unlock()
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// The revalidation process should replace
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// this node in the bucket if it is unresponsive.
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transport.dead[last.ID()] = !lastInBucketIsResponding
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transport.dead[replacementNode.ID()] = !newNodeIsResponding
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// Add replacement node to table.
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tab.addFoundNode(replacementNode)
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t.Log("last:", last.ID())
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t.Log("replacement:", replacementNode.ID())
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// Wait until the last node was pinged.
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waitForRevalidationPing(t, transport, tab, last.ID())
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if !lastInBucketIsResponding {
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if !nodeEvents.waitNodeAbsent(last.ID(), 2*time.Second) {
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t.Error("last node was not removed")
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}
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if !nodeEvents.waitNodePresent(replacementNode.ID(), 2*time.Second) {
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t.Error("replacement node was not added")
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}
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// If a replacement is expected, we also need to wait until the replacement node
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// was pinged and added/removed.
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waitForRevalidationPing(t, transport, tab, replacementNode.ID())
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if !newNodeIsResponding {
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if !nodeEvents.waitNodeAbsent(replacementNode.ID(), 2*time.Second) {
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t.Error("replacement node was not removed")
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}
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}
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}
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// Check bucket content.
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tab.mutex.Lock()
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defer tab.mutex.Unlock()
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wantSize := bucketSize
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if !lastInBucketIsResponding && !newNodeIsResponding {
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wantSize--
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}
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bucket := tab.bucket(replacementNode.ID())
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if l := len(bucket.entries); l != wantSize {
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t.Errorf("wrong bucket size after revalidation: got %d, want %d", l, wantSize)
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}
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if ok := contains(bucket.entries, last.ID()); ok != lastInBucketIsResponding {
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t.Errorf("revalidated node found: %t, want: %t", ok, lastInBucketIsResponding)
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}
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wantNewEntry := newNodeIsResponding && !lastInBucketIsResponding
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if ok := contains(bucket.entries, replacementNode.ID()); ok != wantNewEntry {
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t.Errorf("replacement node found: %t, want: %t", ok, wantNewEntry)
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}
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}
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// waitForRevalidationPing waits until a PING message is sent to a node with the given id.
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func waitForRevalidationPing(t *testing.T, transport *pingRecorder, tab *Table, id enode.ID) *enode.Node {
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t.Helper()
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simclock := tab.cfg.Clock.(*mclock.Simulated)
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maxAttempts := tab.len() * 8
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for i := 0; i < maxAttempts; i++ {
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simclock.Run(tab.cfg.PingInterval)
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p := transport.waitPing(2 * time.Second)
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if p == nil {
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t.Fatal("Table did not send revalidation ping")
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}
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if id == (enode.ID{}) || p.ID() == id {
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return p
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}
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}
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t.Fatalf("Table did not ping node %v (%d attempts)", id, maxAttempts)
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return nil
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}
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// This checks that the table-wide IP limit is applied correctly.
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func TestTable_IPLimit(t *testing.T) {
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transport := newPingRecorder()
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tab, db := newTestTable(transport, Config{})
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defer db.Close()
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defer tab.close()
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for i := 0; i < tableIPLimit+1; i++ {
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n := nodeAtDistance(tab.self().ID(), i, net.IP{172, 0, 1, byte(i)})
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tab.addFoundNode(n)
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}
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if tab.len() > tableIPLimit {
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t.Errorf("too many nodes in table")
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}
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checkIPLimitInvariant(t, tab)
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}
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// This checks that the per-bucket IP limit is applied correctly.
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func TestTable_BucketIPLimit(t *testing.T) {
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transport := newPingRecorder()
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tab, db := newTestTable(transport, Config{})
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defer db.Close()
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defer tab.close()
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d := 3
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for i := 0; i < bucketIPLimit+1; i++ {
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n := nodeAtDistance(tab.self().ID(), d, net.IP{172, 0, 1, byte(i)})
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tab.addFoundNode(n)
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}
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if tab.len() > bucketIPLimit {
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t.Errorf("too many nodes in table")
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}
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checkIPLimitInvariant(t, tab)
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}
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// checkIPLimitInvariant checks that ip limit sets contain an entry for every
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// node in the table and no extra entries.
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func checkIPLimitInvariant(t *testing.T, tab *Table) {
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t.Helper()
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tabset := netutil.DistinctNetSet{Subnet: tableSubnet, Limit: tableIPLimit}
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for _, b := range tab.buckets {
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for _, n := range b.entries {
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tabset.Add(n.IP())
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}
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}
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if tabset.String() != tab.ips.String() {
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t.Errorf("table IP set is incorrect:\nhave: %v\nwant: %v", tab.ips, tabset)
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}
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}
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func TestTable_findnodeByID(t *testing.T) {
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t.Parallel()
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test := func(test *closeTest) bool {
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// for any node table, Target and N
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transport := newPingRecorder()
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tab, db := newTestTable(transport, Config{})
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defer db.Close()
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defer tab.close()
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fillTable(tab, test.All, true)
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// check that closest(Target, N) returns nodes
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result := tab.findnodeByID(test.Target, test.N, false).entries
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if hasDuplicates(result) {
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t.Errorf("result contains duplicates")
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return false
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}
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if !sortedByDistanceTo(test.Target, result) {
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t.Errorf("result is not sorted by distance to target")
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return false
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}
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// check that the number of results is min(N, tablen)
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wantN := test.N
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if tlen := tab.len(); tlen < test.N {
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wantN = tlen
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}
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if len(result) != wantN {
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t.Errorf("wrong number of nodes: got %d, want %d", len(result), wantN)
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return false
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} else if len(result) == 0 {
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return true // no need to check distance
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}
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// check that the result nodes have minimum distance to target.
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for _, b := range tab.buckets {
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for _, n := range b.entries {
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if contains(result, n.ID()) {
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continue // don't run the check below for nodes in result
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}
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farthestResult := result[len(result)-1].ID()
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if enode.DistCmp(test.Target, n.ID(), farthestResult) < 0 {
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t.Errorf("table contains node that is closer to target but it's not in result")
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t.Logf(" Target: %v", test.Target)
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t.Logf(" Farthest Result: %v", farthestResult)
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t.Logf(" ID: %v", n.ID())
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return false
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}
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}
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}
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return true
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}
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if err := quick.Check(test, quickcfg()); err != nil {
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t.Error(err)
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}
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}
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type closeTest struct {
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Self enode.ID
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Target enode.ID
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All []*node
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N int
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}
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func (*closeTest) Generate(rand *rand.Rand, size int) reflect.Value {
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t := &closeTest{
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Self: gen(enode.ID{}, rand).(enode.ID),
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Target: gen(enode.ID{}, rand).(enode.ID),
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N: rand.Intn(bucketSize),
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}
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for _, id := range gen([]enode.ID{}, rand).([]enode.ID) {
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r := new(enr.Record)
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r.Set(enr.IP(genIP(rand)))
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n := wrapNode(enode.SignNull(r, id))
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n.livenessChecks = 1
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t.All = append(t.All, n)
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}
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return reflect.ValueOf(t)
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}
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func TestTable_addVerifiedNode(t *testing.T) {
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tab, db := newTestTable(newPingRecorder(), Config{})
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<-tab.initDone
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defer db.Close()
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defer tab.close()
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// Insert two nodes.
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n1 := nodeAtDistance(tab.self().ID(), 256, net.IP{88, 77, 66, 1})
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n2 := nodeAtDistance(tab.self().ID(), 256, net.IP{88, 77, 66, 2})
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tab.addFoundNode(n1)
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tab.addFoundNode(n2)
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bucket := tab.bucket(n1.ID())
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// Verify bucket content:
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bcontent := []*node{n1, n2}
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if !reflect.DeepEqual(unwrapNodes(bucket.entries), unwrapNodes(bcontent)) {
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t.Fatalf("wrong bucket content: %v", bucket.entries)
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}
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// Add a changed version of n2.
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newrec := n2.Record()
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newrec.Set(enr.IP{99, 99, 99, 99})
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newn2 := wrapNode(enode.SignNull(newrec, n2.ID()))
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tab.addInboundNode(newn2)
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// Check that bucket is updated correctly.
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newBcontent := []*node{n1, newn2}
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if !reflect.DeepEqual(unwrapNodes(bucket.entries), unwrapNodes(newBcontent)) {
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t.Fatalf("wrong bucket content after update: %v", bucket.entries)
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}
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checkIPLimitInvariant(t, tab)
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}
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func TestTable_addSeenNode(t *testing.T) {
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tab, db := newTestTable(newPingRecorder(), Config{})
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<-tab.initDone
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defer db.Close()
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defer tab.close()
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// Insert two nodes.
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n1 := nodeAtDistance(tab.self().ID(), 256, net.IP{88, 77, 66, 1})
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n2 := nodeAtDistance(tab.self().ID(), 256, net.IP{88, 77, 66, 2})
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tab.addFoundNode(n1)
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tab.addFoundNode(n2)
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// Verify bucket content:
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bcontent := []*node{n1, n2}
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if !reflect.DeepEqual(tab.bucket(n1.ID()).entries, bcontent) {
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t.Fatalf("wrong bucket content: %v", tab.bucket(n1.ID()).entries)
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}
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// Add a changed version of n2.
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newrec := n2.Record()
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newrec.Set(enr.IP{99, 99, 99, 99})
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newn2 := wrapNode(enode.SignNull(newrec, n2.ID()))
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tab.addFoundNode(newn2)
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// Check that bucket content is unchanged.
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if !reflect.DeepEqual(tab.bucket(n1.ID()).entries, bcontent) {
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t.Fatalf("wrong bucket content after update: %v", tab.bucket(n1.ID()).entries)
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}
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checkIPLimitInvariant(t, tab)
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}
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// This test checks that ENR updates happen during revalidation. If a node in the table
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// announces a new sequence number, the new record should be pulled.
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func TestTable_revalidateSyncRecord(t *testing.T) {
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transport := newPingRecorder()
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tab, db := newTestTable(transport, Config{
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Clock: new(mclock.Simulated),
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Log: testlog.Logger(t, log.LevelTrace),
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})
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<-tab.initDone
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defer db.Close()
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defer tab.close()
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// Insert a node.
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var r enr.Record
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r.Set(enr.IP(net.IP{127, 0, 0, 1}))
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id := enode.ID{1}
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n1 := wrapNode(enode.SignNull(&r, id))
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tab.addFoundNode(n1)
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// Update the node record.
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r.Set(enr.WithEntry("foo", "bar"))
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n2 := enode.SignNull(&r, id)
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transport.updateRecord(n2)
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// Wait for revalidation. We wait for the node to be revalidated two times
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// in order to synchronize with the update in the table.
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waitForRevalidationPing(t, transport, tab, n2.ID())
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waitForRevalidationPing(t, transport, tab, n2.ID())
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intable := tab.getNode(id)
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if !reflect.DeepEqual(intable, n2) {
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t.Fatalf("table contains old record with seq %d, want seq %d", intable.Seq(), n2.Seq())
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}
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}
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func TestNodesPush(t *testing.T) {
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var target enode.ID
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n1 := nodeAtDistance(target, 255, intIP(1))
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n2 := nodeAtDistance(target, 254, intIP(2))
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n3 := nodeAtDistance(target, 253, intIP(3))
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perm := [][]*node{
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{n3, n2, n1},
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{n3, n1, n2},
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{n2, n3, n1},
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{n2, n1, n3},
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{n1, n3, n2},
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{n1, n2, n3},
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}
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// Insert all permutations into lists with size limit 3.
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for _, nodes := range perm {
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list := nodesByDistance{target: target}
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for _, n := range nodes {
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list.push(n, 3)
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}
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if !slicesEqual(list.entries, perm[0], nodeIDEqual) {
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t.Fatal("not equal")
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}
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}
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// Insert all permutations into lists with size limit 2.
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for _, nodes := range perm {
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list := nodesByDistance{target: target}
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for _, n := range nodes {
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list.push(n, 2)
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}
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if !slicesEqual(list.entries, perm[0][:2], nodeIDEqual) {
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t.Fatal("not equal")
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}
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}
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}
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func nodeIDEqual(n1, n2 *node) bool {
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return n1.ID() == n2.ID()
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}
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func slicesEqual[T any](s1, s2 []T, check func(e1, e2 T) bool) bool {
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if len(s1) != len(s2) {
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return false
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}
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for i := range s1 {
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if !check(s1[i], s2[i]) {
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return false
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}
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}
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return true
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}
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// gen wraps quick.Value so it's easier to use.
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// it generates a random value of the given value's type.
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func gen(typ interface{}, rand *rand.Rand) interface{} {
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v, ok := quick.Value(reflect.TypeOf(typ), rand)
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if !ok {
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panic(fmt.Sprintf("couldn't generate random value of type %T", typ))
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}
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return v.Interface()
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}
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func genIP(rand *rand.Rand) net.IP {
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ip := make(net.IP, 4)
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rand.Read(ip)
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return ip
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}
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func quickcfg() *quick.Config {
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return &quick.Config{
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MaxCount: 5000,
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Rand: rand.New(rand.NewSource(time.Now().Unix())),
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}
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}
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func newkey() *ecdsa.PrivateKey {
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key, err := crypto.GenerateKey()
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if err != nil {
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panic("couldn't generate key: " + err.Error())
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}
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return key
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}
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