p2p/discover, p2p/enode: rework endpoint proof handling, packet logging (#18963)

This change resolves multiple issues around handling of endpoint proofs.
The proof is now done separately for each IP and completing the proof
requires a matching ping hash.

Also remove waitping because it's equivalent to sleep. waitping was
slightly more efficient, but that may cause issues with findnode if
packets are reordered and the remote end sees findnode before pong.

Logging of received packets was hitherto done after handling the packet,
which meant that sent replies were logged before the packet that
generated them. This change splits up packet handling into 'preverify'
and 'handle'. The error from 'preverify' is logged, but 'handle' happens
after the message is logged. This fixes the order. Packet logs now
contain the node ID.

p2p/discover/table_test.go

@@ -50,8 +50,8 @@ func TestTable_pingReplace(t *testing.T) {
 func testPingReplace(t *testing.T, newNodeIsResponding, lastInBucketIsResponding bool) {
 	transport := newPingRecorder()
 	tab, db := newTestTable(transport)
-	defer tab.Close()
 	defer db.Close()
+	defer tab.Close()
 
 	<-tab.initDone
 
@@ -137,8 +137,8 @@ func TestBucket_bumpNoDuplicates(t *testing.T) {
 func TestTable_IPLimit(t *testing.T) {
 	transport := newPingRecorder()
 	tab, db := newTestTable(transport)
-	defer tab.Close()
 	defer db.Close()
+	defer tab.Close()
 
 	for i := 0; i < tableIPLimit+1; i++ {
 		n := nodeAtDistance(tab.self().ID(), i, net.IP{172, 0, 1, byte(i)})
@@ -153,8 +153,8 @@ func TestTable_IPLimit(t *testing.T) {
 func TestTable_BucketIPLimit(t *testing.T) {
 	transport := newPingRecorder()
 	tab, db := newTestTable(transport)
-	defer tab.Close()
 	defer db.Close()
+	defer tab.Close()
 
 	d := 3
 	for i := 0; i < bucketIPLimit+1; i++ {
@@ -173,9 +173,9 @@ func TestTable_closest(t *testing.T) {
 		// for any node table, Target and N
 		transport := newPingRecorder()
 		tab, db := newTestTable(transport)
-		defer tab.Close()
 		defer db.Close()
-		tab.stuff(test.All)
+		defer tab.Close()
+		fillTable(tab, test.All)
 
 		// check that closest(Target, N) returns nodes
 		result := tab.closest(test.Target, test.N).entries
@@ -234,13 +234,13 @@ func TestTable_ReadRandomNodesGetAll(t *testing.T) {
 	test := func(buf []*enode.Node) bool {
 		transport := newPingRecorder()
 		tab, db := newTestTable(transport)
-		defer tab.Close()
 		defer db.Close()
+		defer tab.Close()
 		<-tab.initDone
 
 		for i := 0; i < len(buf); i++ {
 			ld := cfg.Rand.Intn(len(tab.buckets))
-			tab.stuff([]*node{nodeAtDistance(tab.self().ID(), ld, intIP(ld))})
+			fillTable(tab, []*node{nodeAtDistance(tab.self().ID(), ld, intIP(ld))})
 		}
 		gotN := tab.ReadRandomNodes(buf)
 		if gotN != tab.len() {
@@ -272,16 +272,19 @@ func (*closeTest) Generate(rand *rand.Rand, size int) reflect.Value {
 		N:      rand.Intn(bucketSize),
 	}
 	for _, id := range gen([]enode.ID{}, rand).([]enode.ID) {
-		n := enode.SignNull(new(enr.Record), id)
-		t.All = append(t.All, wrapNode(n))
+		r := new(enr.Record)
+		r.Set(enr.IP(genIP(rand)))
+		n := wrapNode(enode.SignNull(r, id))
+		n.livenessChecks = 1
+		t.All = append(t.All, n)
 	}
 	return reflect.ValueOf(t)
 }
 
 func TestTable_Lookup(t *testing.T) {
 	tab, db := newTestTable(lookupTestnet)
-	defer tab.Close()
 	defer db.Close()
+	defer tab.Close()
 
 	// lookup on empty table returns no nodes
 	if results := tab.lookup(lookupTestnet.target, false); len(results) > 0 {
@@ -289,8 +292,9 @@ func TestTable_Lookup(t *testing.T) {
 	}
 	// seed table with initial node (otherwise lookup will terminate immediately)
 	seedKey, _ := decodePubkey(lookupTestnet.dists[256][0])
-	seed := wrapNode(enode.NewV4(seedKey, net.IP{}, 0, 256))
-	tab.stuff([]*node{seed})
+	seed := wrapNode(enode.NewV4(seedKey, net.IP{127, 0, 0, 1}, 0, 256))
+	seed.livenessChecks = 1
+	fillTable(tab, []*node{seed})
 
 	results := tab.lookup(lookupTestnet.target, true)
 	t.Logf("results:")
@@ -578,6 +582,12 @@ func gen(typ interface{}, rand *rand.Rand) interface{} {
 	return v.Interface()
 }
 
+func genIP(rand *rand.Rand) net.IP {
+	ip := make(net.IP, 4)
+	rand.Read(ip)
+	return ip
+}
+
 func quickcfg() *quick.Config {
 	return &quick.Config{
 		MaxCount: 5000,