2020-07-07 07:37:33 -05:00
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// Copyright 2020 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU 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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// go-ethereum 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 General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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package v4test
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import (
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"bytes"
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"crypto/rand"
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"fmt"
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"net"
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"time"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/internal/utesting"
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"github.com/ethereum/go-ethereum/p2p/discover/v4wire"
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)
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const (
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expiration = 20 * time.Second
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wrongPacket = 66
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macSize = 256 / 8
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)
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var (
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// Remote node under test
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Remote string
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// IP where the first tester is listening, port will be assigned
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Listen1 string = "127.0.0.1"
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// IP where the second tester is listening, port will be assigned
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// Before running the test, you may have to `sudo ifconfig lo0 add 127.0.0.2` (on MacOS at least)
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Listen2 string = "127.0.0.2"
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)
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type pingWithJunk struct {
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Version uint
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From, To v4wire.Endpoint
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Expiration uint64
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JunkData1 uint
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JunkData2 []byte
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}
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func (req *pingWithJunk) Name() string { return "PING/v4" }
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func (req *pingWithJunk) Kind() byte { return v4wire.PingPacket }
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type pingWrongType struct {
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Version uint
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From, To v4wire.Endpoint
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Expiration uint64
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}
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func (req *pingWrongType) Name() string { return "WRONG/v4" }
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func (req *pingWrongType) Kind() byte { return wrongPacket }
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func futureExpiration() uint64 {
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return uint64(time.Now().Add(expiration).Unix())
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}
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// This test just sends a PING packet and expects a response.
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func BasicPing(t *utesting.T) {
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te := newTestEnv(Remote, Listen1, Listen2)
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defer te.close()
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pingHash := te.send(te.l1, &v4wire.Ping{
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Version: 4,
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From: te.localEndpoint(te.l1),
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To: te.remoteEndpoint(),
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Expiration: futureExpiration(),
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})
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2021-08-03 04:21:39 -05:00
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if err := te.checkPingPong(pingHash); err != nil {
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2020-07-07 07:37:33 -05:00
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t.Fatal(err)
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}
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}
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2021-08-03 04:21:39 -05:00
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// checkPingPong verifies that the remote side sends both a PONG with the
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// correct hash, and a PING.
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// The two packets do not have to be in any particular order.
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func (te *testenv) checkPingPong(pingHash []byte) error {
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var (
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pings int
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pongs int
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)
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for i := 0; i < 2; i++ {
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reply, _, err := te.read(te.l1)
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if err != nil {
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return err
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}
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switch reply.Kind() {
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case v4wire.PongPacket:
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if err := te.checkPong(reply, pingHash); err != nil {
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return err
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}
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pongs++
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case v4wire.PingPacket:
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pings++
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default:
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return fmt.Errorf("expected PING or PONG, got %v %v", reply.Name(), reply)
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}
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}
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if pongs == 1 && pings == 1 {
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return nil
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}
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return fmt.Errorf("expected 1 PING (got %d) and 1 PONG (got %d)", pings, pongs)
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}
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// checkPong verifies that reply is a valid PONG matching the given ping hash,
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// and a PING. The two packets do not have to be in any particular order.
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func (te *testenv) checkPong(reply v4wire.Packet, pingHash []byte) error {
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if reply == nil {
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return fmt.Errorf("expected PONG reply, got nil")
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}
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if reply.Kind() != v4wire.PongPacket {
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return fmt.Errorf("expected PONG reply, got %v %v", reply.Name(), reply)
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}
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pong := reply.(*v4wire.Pong)
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if !bytes.Equal(pong.ReplyTok, pingHash) {
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return fmt.Errorf("PONG reply token mismatch: got %x, want %x", pong.ReplyTok, pingHash)
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}
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2021-07-07 10:28:14 -05:00
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if want := te.localEndpoint(te.l1); !want.IP.Equal(pong.To.IP) || want.UDP != pong.To.UDP {
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return fmt.Errorf("PONG 'to' endpoint mismatch: got %+v, want %+v", pong.To, want)
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}
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if v4wire.Expired(pong.Expiration) {
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return fmt.Errorf("PONG is expired (%v)", pong.Expiration)
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}
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return nil
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}
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// This test sends a PING packet with wrong 'to' field and expects a PONG response.
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func PingWrongTo(t *utesting.T) {
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te := newTestEnv(Remote, Listen1, Listen2)
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defer te.close()
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wrongEndpoint := v4wire.Endpoint{IP: net.ParseIP("192.0.2.0")}
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pingHash := te.send(te.l1, &v4wire.Ping{
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Version: 4,
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From: te.localEndpoint(te.l1),
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To: wrongEndpoint,
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Expiration: futureExpiration(),
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})
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2021-08-03 04:21:39 -05:00
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if err := te.checkPingPong(pingHash); err != nil {
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t.Fatal(err)
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}
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}
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// This test sends a PING packet with wrong 'from' field and expects a PONG response.
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func PingWrongFrom(t *utesting.T) {
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te := newTestEnv(Remote, Listen1, Listen2)
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defer te.close()
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wrongEndpoint := v4wire.Endpoint{IP: net.ParseIP("192.0.2.0")}
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pingHash := te.send(te.l1, &v4wire.Ping{
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Version: 4,
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From: wrongEndpoint,
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To: te.remoteEndpoint(),
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Expiration: futureExpiration(),
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})
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2021-08-03 04:21:39 -05:00
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if err := te.checkPingPong(pingHash); err != nil {
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2020-07-07 07:37:33 -05:00
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t.Fatal(err)
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}
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}
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// This test sends a PING packet with additional data at the end and expects a PONG
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// response. The remote node should respond because EIP-8 mandates ignoring additional
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// trailing data.
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func PingExtraData(t *utesting.T) {
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te := newTestEnv(Remote, Listen1, Listen2)
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defer te.close()
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pingHash := te.send(te.l1, &pingWithJunk{
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Version: 4,
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From: te.localEndpoint(te.l1),
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To: te.remoteEndpoint(),
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Expiration: futureExpiration(),
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JunkData1: 42,
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JunkData2: []byte{9, 8, 7, 6, 5, 4, 3, 2, 1},
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})
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2021-08-03 04:21:39 -05:00
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if err := te.checkPingPong(pingHash); err != nil {
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2020-07-07 07:37:33 -05:00
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t.Fatal(err)
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}
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}
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// This test sends a PING packet with additional data and wrong 'from' field
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// and expects a PONG response.
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func PingExtraDataWrongFrom(t *utesting.T) {
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te := newTestEnv(Remote, Listen1, Listen2)
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defer te.close()
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wrongEndpoint := v4wire.Endpoint{IP: net.ParseIP("192.0.2.0")}
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req := pingWithJunk{
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Version: 4,
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From: wrongEndpoint,
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To: te.remoteEndpoint(),
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Expiration: futureExpiration(),
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JunkData1: 42,
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JunkData2: []byte{9, 8, 7, 6, 5, 4, 3, 2, 1},
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}
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pingHash := te.send(te.l1, &req)
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if err := te.checkPingPong(pingHash); err != nil {
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t.Fatal(err)
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}
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}
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// This test sends a PING packet with an expiration in the past.
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// The remote node should not respond.
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func PingPastExpiration(t *utesting.T) {
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te := newTestEnv(Remote, Listen1, Listen2)
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defer te.close()
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te.send(te.l1, &v4wire.Ping{
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Version: 4,
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From: te.localEndpoint(te.l1),
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To: te.remoteEndpoint(),
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Expiration: -futureExpiration(),
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})
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reply, _, _ := te.read(te.l1)
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if reply != nil {
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t.Fatal("Expected no reply, got", reply)
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}
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}
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// This test sends an invalid packet. The remote node should not respond.
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func WrongPacketType(t *utesting.T) {
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te := newTestEnv(Remote, Listen1, Listen2)
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defer te.close()
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te.send(te.l1, &pingWrongType{
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Version: 4,
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From: te.localEndpoint(te.l1),
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To: te.remoteEndpoint(),
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Expiration: futureExpiration(),
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})
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reply, _, _ := te.read(te.l1)
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if reply != nil {
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t.Fatal("Expected no reply, got", reply)
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}
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}
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// This test verifies that the default behaviour of ignoring 'from' fields is unaffected by
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// the bonding process. After bonding, it pings the target with a different from endpoint.
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func BondThenPingWithWrongFrom(t *utesting.T) {
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te := newTestEnv(Remote, Listen1, Listen2)
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defer te.close()
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bond(t, te)
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wrongEndpoint := v4wire.Endpoint{IP: net.ParseIP("192.0.2.0")}
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pingHash := te.send(te.l1, &v4wire.Ping{
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Version: 4,
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From: wrongEndpoint,
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To: te.remoteEndpoint(),
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Expiration: futureExpiration(),
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})
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if reply, _, err := te.read(te.l1); err != nil {
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t.Fatal(err)
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} else if err := te.checkPong(reply, pingHash); err != nil {
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2020-07-07 07:37:33 -05:00
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t.Fatal(err)
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}
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}
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// This test just sends FINDNODE. The remote node should not reply
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// because the endpoint proof has not completed.
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func FindnodeWithoutEndpointProof(t *utesting.T) {
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te := newTestEnv(Remote, Listen1, Listen2)
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defer te.close()
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req := v4wire.Findnode{Expiration: futureExpiration()}
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rand.Read(req.Target[:])
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te.send(te.l1, &req)
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reply, _, _ := te.read(te.l1)
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if reply != nil {
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t.Fatal("Expected no response, got", reply)
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}
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}
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// BasicFindnode sends a FINDNODE request after performing the endpoint
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// proof. The remote node should respond.
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func BasicFindnode(t *utesting.T) {
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te := newTestEnv(Remote, Listen1, Listen2)
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defer te.close()
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bond(t, te)
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findnode := v4wire.Findnode{Expiration: futureExpiration()}
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rand.Read(findnode.Target[:])
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te.send(te.l1, &findnode)
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reply, _, err := te.read(te.l1)
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if err != nil {
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t.Fatal("read find nodes", err)
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}
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if reply.Kind() != v4wire.NeighborsPacket {
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t.Fatal("Expected neighbors, got", reply.Name())
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}
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}
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// This test sends an unsolicited NEIGHBORS packet after the endpoint proof, then sends
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// FINDNODE to read the remote table. The remote node should not return the node contained
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// in the unsolicited NEIGHBORS packet.
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func UnsolicitedNeighbors(t *utesting.T) {
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te := newTestEnv(Remote, Listen1, Listen2)
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defer te.close()
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bond(t, te)
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// Send unsolicited NEIGHBORS response.
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fakeKey, _ := crypto.GenerateKey()
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encFakeKey := v4wire.EncodePubkey(&fakeKey.PublicKey)
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neighbors := v4wire.Neighbors{
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Expiration: futureExpiration(),
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Nodes: []v4wire.Node{{
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ID: encFakeKey,
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IP: net.IP{1, 2, 3, 4},
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UDP: 30303,
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TCP: 30303,
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}},
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}
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te.send(te.l1, &neighbors)
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// Check if the remote node included the fake node.
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te.send(te.l1, &v4wire.Findnode{
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Expiration: futureExpiration(),
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Target: encFakeKey,
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})
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reply, _, err := te.read(te.l1)
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if err != nil {
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t.Fatal("read find nodes", err)
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}
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if reply.Kind() != v4wire.NeighborsPacket {
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t.Fatal("Expected neighbors, got", reply.Name())
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}
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nodes := reply.(*v4wire.Neighbors).Nodes
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if contains(nodes, encFakeKey) {
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t.Fatal("neighbors response contains node from earlier unsolicited neighbors response")
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}
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}
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// This test sends FINDNODE with an expiration timestamp in the past.
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// The remote node should not respond.
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func FindnodePastExpiration(t *utesting.T) {
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te := newTestEnv(Remote, Listen1, Listen2)
|
|
|
|
defer te.close()
|
|
|
|
bond(t, te)
|
|
|
|
|
|
|
|
findnode := v4wire.Findnode{Expiration: -futureExpiration()}
|
|
|
|
rand.Read(findnode.Target[:])
|
|
|
|
te.send(te.l1, &findnode)
|
|
|
|
|
|
|
|
for {
|
|
|
|
reply, _, _ := te.read(te.l1)
|
|
|
|
if reply == nil {
|
|
|
|
return
|
|
|
|
} else if reply.Kind() == v4wire.NeighborsPacket {
|
|
|
|
t.Fatal("Unexpected NEIGHBORS response for expired FINDNODE request")
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// bond performs the endpoint proof with the remote node.
|
|
|
|
func bond(t *utesting.T, te *testenv) {
|
|
|
|
te.send(te.l1, &v4wire.Ping{
|
|
|
|
Version: 4,
|
|
|
|
From: te.localEndpoint(te.l1),
|
|
|
|
To: te.remoteEndpoint(),
|
|
|
|
Expiration: futureExpiration(),
|
|
|
|
})
|
|
|
|
|
|
|
|
var gotPing, gotPong bool
|
|
|
|
for !gotPing || !gotPong {
|
|
|
|
req, hash, err := te.read(te.l1)
|
|
|
|
if err != nil {
|
|
|
|
t.Fatal(err)
|
|
|
|
}
|
|
|
|
switch req.(type) {
|
|
|
|
case *v4wire.Ping:
|
|
|
|
te.send(te.l1, &v4wire.Pong{
|
|
|
|
To: te.remoteEndpoint(),
|
|
|
|
ReplyTok: hash,
|
|
|
|
Expiration: futureExpiration(),
|
|
|
|
})
|
|
|
|
gotPing = true
|
|
|
|
case *v4wire.Pong:
|
|
|
|
// TODO: maybe verify pong data here
|
|
|
|
gotPong = true
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// This test attempts to perform a traffic amplification attack against a
|
|
|
|
// 'victim' endpoint using FINDNODE. In this attack scenario, the attacker
|
|
|
|
// attempts to complete the endpoint proof non-interactively by sending a PONG
|
|
|
|
// with mismatching reply token from the 'victim' endpoint. The attack works if
|
|
|
|
// the remote node does not verify the PONG reply token field correctly. The
|
|
|
|
// attacker could then perform traffic amplification by sending many FINDNODE
|
|
|
|
// requests to the discovery node, which would reply to the 'victim' address.
|
|
|
|
func FindnodeAmplificationInvalidPongHash(t *utesting.T) {
|
|
|
|
te := newTestEnv(Remote, Listen1, Listen2)
|
|
|
|
defer te.close()
|
|
|
|
|
|
|
|
// Send PING to start endpoint verification.
|
|
|
|
te.send(te.l1, &v4wire.Ping{
|
|
|
|
Version: 4,
|
|
|
|
From: te.localEndpoint(te.l1),
|
|
|
|
To: te.remoteEndpoint(),
|
|
|
|
Expiration: futureExpiration(),
|
|
|
|
})
|
|
|
|
|
|
|
|
var gotPing, gotPong bool
|
|
|
|
for !gotPing || !gotPong {
|
|
|
|
req, _, err := te.read(te.l1)
|
|
|
|
if err != nil {
|
|
|
|
t.Fatal(err)
|
|
|
|
}
|
|
|
|
switch req.(type) {
|
|
|
|
case *v4wire.Ping:
|
|
|
|
// Send PONG from this node ID, but with invalid ReplyTok.
|
|
|
|
te.send(te.l1, &v4wire.Pong{
|
|
|
|
To: te.remoteEndpoint(),
|
|
|
|
ReplyTok: make([]byte, macSize),
|
|
|
|
Expiration: futureExpiration(),
|
|
|
|
})
|
|
|
|
gotPing = true
|
|
|
|
case *v4wire.Pong:
|
|
|
|
gotPong = true
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Now send FINDNODE. The remote node should not respond because our
|
|
|
|
// PONG did not reference the PING hash.
|
|
|
|
findnode := v4wire.Findnode{Expiration: futureExpiration()}
|
|
|
|
rand.Read(findnode.Target[:])
|
|
|
|
te.send(te.l1, &findnode)
|
|
|
|
|
|
|
|
// If we receive a NEIGHBORS response, the attack worked and the test fails.
|
|
|
|
reply, _, _ := te.read(te.l1)
|
|
|
|
if reply != nil && reply.Kind() == v4wire.NeighborsPacket {
|
|
|
|
t.Error("Got neighbors")
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// This test attempts to perform a traffic amplification attack using FINDNODE.
|
|
|
|
// The attack works if the remote node does not verify the IP address of FINDNODE
|
|
|
|
// against the endpoint verification proof done by PING/PONG.
|
|
|
|
func FindnodeAmplificationWrongIP(t *utesting.T) {
|
|
|
|
te := newTestEnv(Remote, Listen1, Listen2)
|
|
|
|
defer te.close()
|
|
|
|
|
|
|
|
// Do the endpoint proof from the l1 IP.
|
|
|
|
bond(t, te)
|
|
|
|
|
|
|
|
// Now send FINDNODE from the same node ID, but different IP address.
|
|
|
|
// The remote node should not respond.
|
|
|
|
findnode := v4wire.Findnode{Expiration: futureExpiration()}
|
|
|
|
rand.Read(findnode.Target[:])
|
|
|
|
te.send(te.l2, &findnode)
|
|
|
|
|
|
|
|
// If we receive a NEIGHBORS response, the attack worked and the test fails.
|
|
|
|
reply, _, _ := te.read(te.l2)
|
|
|
|
if reply != nil {
|
|
|
|
t.Error("Got NEIGHORS response for FINDNODE from wrong IP")
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
var AllTests = []utesting.Test{
|
|
|
|
{Name: "Ping/Basic", Fn: BasicPing},
|
|
|
|
{Name: "Ping/WrongTo", Fn: PingWrongTo},
|
|
|
|
{Name: "Ping/WrongFrom", Fn: PingWrongFrom},
|
|
|
|
{Name: "Ping/ExtraData", Fn: PingExtraData},
|
|
|
|
{Name: "Ping/ExtraDataWrongFrom", Fn: PingExtraDataWrongFrom},
|
|
|
|
{Name: "Ping/PastExpiration", Fn: PingPastExpiration},
|
|
|
|
{Name: "Ping/WrongPacketType", Fn: WrongPacketType},
|
|
|
|
{Name: "Ping/BondThenPingWithWrongFrom", Fn: BondThenPingWithWrongFrom},
|
|
|
|
{Name: "Findnode/WithoutEndpointProof", Fn: FindnodeWithoutEndpointProof},
|
|
|
|
{Name: "Findnode/BasicFindnode", Fn: BasicFindnode},
|
|
|
|
{Name: "Findnode/UnsolicitedNeighbors", Fn: UnsolicitedNeighbors},
|
|
|
|
{Name: "Findnode/PastExpiration", Fn: FindnodePastExpiration},
|
|
|
|
{Name: "Amplification/InvalidPongHash", Fn: FindnodeAmplificationInvalidPongHash},
|
|
|
|
{Name: "Amplification/WrongIP", Fn: FindnodeAmplificationWrongIP},
|
|
|
|
}
|