github.com/pslzym/go-ethereum@v1.8.17-0.20180926104442-4b6824e07b1b/p2p/discover/udp_test.go (about)

     1  // Copyright 2015 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package discover
    18  
    19  import (
    20  	"bytes"
    21  	"crypto/ecdsa"
    22  	"encoding/binary"
    23  	"encoding/hex"
    24  	"errors"
    25  	"fmt"
    26  	"io"
    27  	"math/rand"
    28  	"net"
    29  	"path/filepath"
    30  	"reflect"
    31  	"runtime"
    32  	"sync"
    33  	"testing"
    34  	"time"
    35  
    36  	"github.com/davecgh/go-spew/spew"
    37  	"github.com/ethereum/go-ethereum/common"
    38  	"github.com/ethereum/go-ethereum/crypto"
    39  	"github.com/ethereum/go-ethereum/p2p/enode"
    40  	"github.com/ethereum/go-ethereum/rlp"
    41  )
    42  
    43  func init() {
    44  	spew.Config.DisableMethods = true
    45  }
    46  
    47  // shared test variables
    48  var (
    49  	futureExp          = uint64(time.Now().Add(10 * time.Hour).Unix())
    50  	testTarget         = encPubkey{0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1}
    51  	testRemote         = rpcEndpoint{IP: net.ParseIP("1.1.1.1").To4(), UDP: 1, TCP: 2}
    52  	testLocalAnnounced = rpcEndpoint{IP: net.ParseIP("2.2.2.2").To4(), UDP: 3, TCP: 4}
    53  	testLocal          = rpcEndpoint{IP: net.ParseIP("3.3.3.3").To4(), UDP: 5, TCP: 6}
    54  )
    55  
    56  type udpTest struct {
    57  	t                   *testing.T
    58  	pipe                *dgramPipe
    59  	table               *Table
    60  	udp                 *udp
    61  	sent                [][]byte
    62  	localkey, remotekey *ecdsa.PrivateKey
    63  	remoteaddr          *net.UDPAddr
    64  }
    65  
    66  func newUDPTest(t *testing.T) *udpTest {
    67  	test := &udpTest{
    68  		t:          t,
    69  		pipe:       newpipe(),
    70  		localkey:   newkey(),
    71  		remotekey:  newkey(),
    72  		remoteaddr: &net.UDPAddr{IP: net.IP{10, 0, 1, 99}, Port: 30303},
    73  	}
    74  	test.table, test.udp, _ = newUDP(test.pipe, Config{PrivateKey: test.localkey})
    75  	// Wait for initial refresh so the table doesn't send unexpected findnode.
    76  	<-test.table.initDone
    77  	return test
    78  }
    79  
    80  // handles a packet as if it had been sent to the transport.
    81  func (test *udpTest) packetIn(wantError error, ptype byte, data packet) error {
    82  	enc, _, err := encodePacket(test.remotekey, ptype, data)
    83  	if err != nil {
    84  		return test.errorf("packet (%d) encode error: %v", ptype, err)
    85  	}
    86  	test.sent = append(test.sent, enc)
    87  	if err = test.udp.handlePacket(test.remoteaddr, enc); err != wantError {
    88  		return test.errorf("error mismatch: got %q, want %q", err, wantError)
    89  	}
    90  	return nil
    91  }
    92  
    93  // waits for a packet to be sent by the transport.
    94  // validate should have type func(*udpTest, X) error, where X is a packet type.
    95  func (test *udpTest) waitPacketOut(validate interface{}) ([]byte, error) {
    96  	dgram := test.pipe.waitPacketOut()
    97  	p, _, hash, err := decodePacket(dgram)
    98  	if err != nil {
    99  		return hash, test.errorf("sent packet decode error: %v", err)
   100  	}
   101  	fn := reflect.ValueOf(validate)
   102  	exptype := fn.Type().In(0)
   103  	if reflect.TypeOf(p) != exptype {
   104  		return hash, test.errorf("sent packet type mismatch, got: %v, want: %v", reflect.TypeOf(p), exptype)
   105  	}
   106  	fn.Call([]reflect.Value{reflect.ValueOf(p)})
   107  	return hash, nil
   108  }
   109  
   110  func (test *udpTest) errorf(format string, args ...interface{}) error {
   111  	_, file, line, ok := runtime.Caller(2) // errorf + waitPacketOut
   112  	if ok {
   113  		file = filepath.Base(file)
   114  	} else {
   115  		file = "???"
   116  		line = 1
   117  	}
   118  	err := fmt.Errorf(format, args...)
   119  	fmt.Printf("\t%s:%d: %v\n", file, line, err)
   120  	test.t.Fail()
   121  	return err
   122  }
   123  
   124  func TestUDP_packetErrors(t *testing.T) {
   125  	test := newUDPTest(t)
   126  	defer test.table.Close()
   127  
   128  	test.packetIn(errExpired, pingPacket, &ping{From: testRemote, To: testLocalAnnounced, Version: 4})
   129  	test.packetIn(errUnsolicitedReply, pongPacket, &pong{ReplyTok: []byte{}, Expiration: futureExp})
   130  	test.packetIn(errUnknownNode, findnodePacket, &findnode{Expiration: futureExp})
   131  	test.packetIn(errUnsolicitedReply, neighborsPacket, &neighbors{Expiration: futureExp})
   132  }
   133  
   134  func TestUDP_pingTimeout(t *testing.T) {
   135  	t.Parallel()
   136  	test := newUDPTest(t)
   137  	defer test.table.Close()
   138  
   139  	toaddr := &net.UDPAddr{IP: net.ParseIP("1.2.3.4"), Port: 2222}
   140  	toid := enode.ID{1, 2, 3, 4}
   141  	if err := test.udp.ping(toid, toaddr); err != errTimeout {
   142  		t.Error("expected timeout error, got", err)
   143  	}
   144  }
   145  
   146  func TestUDP_responseTimeouts(t *testing.T) {
   147  	t.Parallel()
   148  	test := newUDPTest(t)
   149  	defer test.table.Close()
   150  
   151  	rand.Seed(time.Now().UnixNano())
   152  	randomDuration := func(max time.Duration) time.Duration {
   153  		return time.Duration(rand.Int63n(int64(max)))
   154  	}
   155  
   156  	var (
   157  		nReqs      = 200
   158  		nTimeouts  = 0                       // number of requests with ptype > 128
   159  		nilErr     = make(chan error, nReqs) // for requests that get a reply
   160  		timeoutErr = make(chan error, nReqs) // for requests that time out
   161  	)
   162  	for i := 0; i < nReqs; i++ {
   163  		// Create a matcher for a random request in udp.loop. Requests
   164  		// with ptype <= 128 will not get a reply and should time out.
   165  		// For all other requests, a reply is scheduled to arrive
   166  		// within the timeout window.
   167  		p := &pending{
   168  			ptype:    byte(rand.Intn(255)),
   169  			callback: func(interface{}) bool { return true },
   170  		}
   171  		binary.BigEndian.PutUint64(p.from[:], uint64(i))
   172  		if p.ptype <= 128 {
   173  			p.errc = timeoutErr
   174  			test.udp.addpending <- p
   175  			nTimeouts++
   176  		} else {
   177  			p.errc = nilErr
   178  			test.udp.addpending <- p
   179  			time.AfterFunc(randomDuration(60*time.Millisecond), func() {
   180  				if !test.udp.handleReply(p.from, p.ptype, nil) {
   181  					t.Logf("not matched: %v", p)
   182  				}
   183  			})
   184  		}
   185  		time.Sleep(randomDuration(30 * time.Millisecond))
   186  	}
   187  
   188  	// Check that all timeouts were delivered and that the rest got nil errors.
   189  	// The replies must be delivered.
   190  	var (
   191  		recvDeadline        = time.After(20 * time.Second)
   192  		nTimeoutsRecv, nNil = 0, 0
   193  	)
   194  	for i := 0; i < nReqs; i++ {
   195  		select {
   196  		case err := <-timeoutErr:
   197  			if err != errTimeout {
   198  				t.Fatalf("got non-timeout error on timeoutErr %d: %v", i, err)
   199  			}
   200  			nTimeoutsRecv++
   201  		case err := <-nilErr:
   202  			if err != nil {
   203  				t.Fatalf("got non-nil error on nilErr %d: %v", i, err)
   204  			}
   205  			nNil++
   206  		case <-recvDeadline:
   207  			t.Fatalf("exceeded recv deadline")
   208  		}
   209  	}
   210  	if nTimeoutsRecv != nTimeouts {
   211  		t.Errorf("wrong number of timeout errors received: got %d, want %d", nTimeoutsRecv, nTimeouts)
   212  	}
   213  	if nNil != nReqs-nTimeouts {
   214  		t.Errorf("wrong number of successful replies: got %d, want %d", nNil, nReqs-nTimeouts)
   215  	}
   216  }
   217  
   218  func TestUDP_findnodeTimeout(t *testing.T) {
   219  	t.Parallel()
   220  	test := newUDPTest(t)
   221  	defer test.table.Close()
   222  
   223  	toaddr := &net.UDPAddr{IP: net.ParseIP("1.2.3.4"), Port: 2222}
   224  	toid := enode.ID{1, 2, 3, 4}
   225  	target := encPubkey{4, 5, 6, 7}
   226  	result, err := test.udp.findnode(toid, toaddr, target)
   227  	if err != errTimeout {
   228  		t.Error("expected timeout error, got", err)
   229  	}
   230  	if len(result) > 0 {
   231  		t.Error("expected empty result, got", result)
   232  	}
   233  }
   234  
   235  func TestUDP_findnode(t *testing.T) {
   236  	test := newUDPTest(t)
   237  	defer test.table.Close()
   238  
   239  	// put a few nodes into the table. their exact
   240  	// distribution shouldn't matter much, although we need to
   241  	// take care not to overflow any bucket.
   242  	nodes := &nodesByDistance{target: testTarget.id()}
   243  	for i := 0; i < bucketSize; i++ {
   244  		key := newkey()
   245  		n := wrapNode(enode.NewV4(&key.PublicKey, net.IP{10, 13, 0, 1}, 0, i))
   246  		nodes.push(n, bucketSize)
   247  	}
   248  	test.table.stuff(nodes.entries)
   249  
   250  	// ensure there's a bond with the test node,
   251  	// findnode won't be accepted otherwise.
   252  	remoteID := encodePubkey(&test.remotekey.PublicKey).id()
   253  	test.table.db.UpdateLastPongReceived(remoteID, time.Now())
   254  
   255  	// check that closest neighbors are returned.
   256  	test.packetIn(nil, findnodePacket, &findnode{Target: testTarget, Expiration: futureExp})
   257  	expected := test.table.closest(testTarget.id(), bucketSize)
   258  
   259  	waitNeighbors := func(want []*node) {
   260  		test.waitPacketOut(func(p *neighbors) {
   261  			if len(p.Nodes) != len(want) {
   262  				t.Errorf("wrong number of results: got %d, want %d", len(p.Nodes), bucketSize)
   263  			}
   264  			for i := range p.Nodes {
   265  				if p.Nodes[i].ID.id() != want[i].ID() {
   266  					t.Errorf("result mismatch at %d:\n  got:  %v\n  want: %v", i, p.Nodes[i], expected.entries[i])
   267  				}
   268  			}
   269  		})
   270  	}
   271  	waitNeighbors(expected.entries[:maxNeighbors])
   272  	waitNeighbors(expected.entries[maxNeighbors:])
   273  }
   274  
   275  func TestUDP_findnodeMultiReply(t *testing.T) {
   276  	test := newUDPTest(t)
   277  	defer test.table.Close()
   278  
   279  	rid := enode.PubkeyToIDV4(&test.remotekey.PublicKey)
   280  	test.table.db.UpdateLastPingReceived(rid, time.Now())
   281  
   282  	// queue a pending findnode request
   283  	resultc, errc := make(chan []*node), make(chan error)
   284  	go func() {
   285  		rid := encodePubkey(&test.remotekey.PublicKey).id()
   286  		ns, err := test.udp.findnode(rid, test.remoteaddr, testTarget)
   287  		if err != nil && len(ns) == 0 {
   288  			errc <- err
   289  		} else {
   290  			resultc <- ns
   291  		}
   292  	}()
   293  
   294  	// wait for the findnode to be sent.
   295  	// after it is sent, the transport is waiting for a reply
   296  	test.waitPacketOut(func(p *findnode) {
   297  		if p.Target != testTarget {
   298  			t.Errorf("wrong target: got %v, want %v", p.Target, testTarget)
   299  		}
   300  	})
   301  
   302  	// send the reply as two packets.
   303  	list := []*node{
   304  		wrapNode(enode.MustParseV4("enode://ba85011c70bcc5c04d8607d3a0ed29aa6179c092cbdda10d5d32684fb33ed01bd94f588ca8f91ac48318087dcb02eaf36773a7a453f0eedd6742af668097b29c@10.0.1.16:30303?discport=30304")),
   305  		wrapNode(enode.MustParseV4("enode://81fa361d25f157cd421c60dcc28d8dac5ef6a89476633339c5df30287474520caca09627da18543d9079b5b288698b542d56167aa5c09111e55acdbbdf2ef799@10.0.1.16:30303")),
   306  		wrapNode(enode.MustParseV4("enode://9bffefd833d53fac8e652415f4973bee289e8b1a5c6c4cbe70abf817ce8a64cee11b823b66a987f51aaa9fba0d6a91b3e6bf0d5a5d1042de8e9eeea057b217f8@10.0.1.36:30301?discport=17")),
   307  		wrapNode(enode.MustParseV4("enode://1b5b4aa662d7cb44a7221bfba67302590b643028197a7d5214790f3bac7aaa4a3241be9e83c09cf1f6c69d007c634faae3dc1b1221793e8446c0b3a09de65960@10.0.1.16:30303")),
   308  	}
   309  	rpclist := make([]rpcNode, len(list))
   310  	for i := range list {
   311  		rpclist[i] = nodeToRPC(list[i])
   312  	}
   313  	test.packetIn(nil, neighborsPacket, &neighbors{Expiration: futureExp, Nodes: rpclist[:2]})
   314  	test.packetIn(nil, neighborsPacket, &neighbors{Expiration: futureExp, Nodes: rpclist[2:]})
   315  
   316  	// check that the sent neighbors are all returned by findnode
   317  	select {
   318  	case result := <-resultc:
   319  		want := append(list[:2], list[3:]...)
   320  		if !reflect.DeepEqual(result, want) {
   321  			t.Errorf("neighbors mismatch:\n  got:  %v\n  want: %v", result, want)
   322  		}
   323  	case err := <-errc:
   324  		t.Errorf("findnode error: %v", err)
   325  	case <-time.After(5 * time.Second):
   326  		t.Error("findnode did not return within 5 seconds")
   327  	}
   328  }
   329  
   330  func TestUDP_successfulPing(t *testing.T) {
   331  	test := newUDPTest(t)
   332  	added := make(chan *node, 1)
   333  	test.table.nodeAddedHook = func(n *node) { added <- n }
   334  	defer test.table.Close()
   335  
   336  	// The remote side sends a ping packet to initiate the exchange.
   337  	go test.packetIn(nil, pingPacket, &ping{From: testRemote, To: testLocalAnnounced, Version: 4, Expiration: futureExp})
   338  
   339  	// the ping is replied to.
   340  	test.waitPacketOut(func(p *pong) {
   341  		pinghash := test.sent[0][:macSize]
   342  		if !bytes.Equal(p.ReplyTok, pinghash) {
   343  			t.Errorf("got pong.ReplyTok %x, want %x", p.ReplyTok, pinghash)
   344  		}
   345  		wantTo := rpcEndpoint{
   346  			// The mirrored UDP address is the UDP packet sender
   347  			IP: test.remoteaddr.IP, UDP: uint16(test.remoteaddr.Port),
   348  			// The mirrored TCP port is the one from the ping packet
   349  			TCP: testRemote.TCP,
   350  		}
   351  		if !reflect.DeepEqual(p.To, wantTo) {
   352  			t.Errorf("got pong.To %v, want %v", p.To, wantTo)
   353  		}
   354  	})
   355  
   356  	// remote is unknown, the table pings back.
   357  	hash, _ := test.waitPacketOut(func(p *ping) error {
   358  		if !reflect.DeepEqual(p.From, test.udp.ourEndpoint) {
   359  			t.Errorf("got ping.From %v, want %v", p.From, test.udp.ourEndpoint)
   360  		}
   361  		wantTo := rpcEndpoint{
   362  			// The mirrored UDP address is the UDP packet sender.
   363  			IP: test.remoteaddr.IP, UDP: uint16(test.remoteaddr.Port),
   364  			TCP: 0,
   365  		}
   366  		if !reflect.DeepEqual(p.To, wantTo) {
   367  			t.Errorf("got ping.To %v, want %v", p.To, wantTo)
   368  		}
   369  		return nil
   370  	})
   371  	test.packetIn(nil, pongPacket, &pong{ReplyTok: hash, Expiration: futureExp})
   372  
   373  	// the node should be added to the table shortly after getting the
   374  	// pong packet.
   375  	select {
   376  	case n := <-added:
   377  		rid := encodePubkey(&test.remotekey.PublicKey).id()
   378  		if n.ID() != rid {
   379  			t.Errorf("node has wrong ID: got %v, want %v", n.ID(), rid)
   380  		}
   381  		if !n.IP().Equal(test.remoteaddr.IP) {
   382  			t.Errorf("node has wrong IP: got %v, want: %v", n.IP(), test.remoteaddr.IP)
   383  		}
   384  		if int(n.UDP()) != test.remoteaddr.Port {
   385  			t.Errorf("node has wrong UDP port: got %v, want: %v", n.UDP(), test.remoteaddr.Port)
   386  		}
   387  		if n.TCP() != int(testRemote.TCP) {
   388  			t.Errorf("node has wrong TCP port: got %v, want: %v", n.TCP(), testRemote.TCP)
   389  		}
   390  	case <-time.After(2 * time.Second):
   391  		t.Errorf("node was not added within 2 seconds")
   392  	}
   393  }
   394  
   395  var testPackets = []struct {
   396  	input      string
   397  	wantPacket interface{}
   398  }{
   399  	{
   400  		input: "71dbda3a79554728d4f94411e42ee1f8b0d561c10e1e5f5893367948c6a7d70bb87b235fa28a77070271b6c164a2dce8c7e13a5739b53b5e96f2e5acb0e458a02902f5965d55ecbeb2ebb6cabb8b2b232896a36b737666c55265ad0a68412f250001ea04cb847f000001820cfa8215a8d790000000000000000000000000000000018208ae820d058443b9a355",
   401  		wantPacket: &ping{
   402  			Version:    4,
   403  			From:       rpcEndpoint{net.ParseIP("127.0.0.1").To4(), 3322, 5544},
   404  			To:         rpcEndpoint{net.ParseIP("::1"), 2222, 3333},
   405  			Expiration: 1136239445,
   406  			Rest:       []rlp.RawValue{},
   407  		},
   408  	},
   409  	{
   410  		input: "e9614ccfd9fc3e74360018522d30e1419a143407ffcce748de3e22116b7e8dc92ff74788c0b6663aaa3d67d641936511c8f8d6ad8698b820a7cf9e1be7155e9a241f556658c55428ec0563514365799a4be2be5a685a80971ddcfa80cb422cdd0101ec04cb847f000001820cfa8215a8d790000000000000000000000000000000018208ae820d058443b9a3550102",
   411  		wantPacket: &ping{
   412  			Version:    4,
   413  			From:       rpcEndpoint{net.ParseIP("127.0.0.1").To4(), 3322, 5544},
   414  			To:         rpcEndpoint{net.ParseIP("::1"), 2222, 3333},
   415  			Expiration: 1136239445,
   416  			Rest:       []rlp.RawValue{{0x01}, {0x02}},
   417  		},
   418  	},
   419  	{
   420  		input: "577be4349c4dd26768081f58de4c6f375a7a22f3f7adda654d1428637412c3d7fe917cadc56d4e5e7ffae1dbe3efffb9849feb71b262de37977e7c7a44e677295680e9e38ab26bee2fcbae207fba3ff3d74069a50b902a82c9903ed37cc993c50001f83e82022bd79020010db83c4d001500000000abcdef12820cfa8215a8d79020010db885a308d313198a2e037073488208ae82823a8443b9a355c5010203040531b9019afde696e582a78fa8d95ea13ce3297d4afb8ba6433e4154caa5ac6431af1b80ba76023fa4090c408f6b4bc3701562c031041d4702971d102c9ab7fa5eed4cd6bab8f7af956f7d565ee1917084a95398b6a21eac920fe3dd1345ec0a7ef39367ee69ddf092cbfe5b93e5e568ebc491983c09c76d922dc3",
   421  		wantPacket: &ping{
   422  			Version:    555,
   423  			From:       rpcEndpoint{net.ParseIP("2001:db8:3c4d:15::abcd:ef12"), 3322, 5544},
   424  			To:         rpcEndpoint{net.ParseIP("2001:db8:85a3:8d3:1319:8a2e:370:7348"), 2222, 33338},
   425  			Expiration: 1136239445,
   426  			Rest:       []rlp.RawValue{{0xC5, 0x01, 0x02, 0x03, 0x04, 0x05}},
   427  		},
   428  	},
   429  	{
   430  		input: "09b2428d83348d27cdf7064ad9024f526cebc19e4958f0fdad87c15eb598dd61d08423e0bf66b2069869e1724125f820d851c136684082774f870e614d95a2855d000f05d1648b2d5945470bc187c2d2216fbe870f43ed0909009882e176a46b0102f846d79020010db885a308d313198a2e037073488208ae82823aa0fbc914b16819237dcd8801d7e53f69e9719adecb3cc0e790c57e91ca4461c9548443b9a355c6010203c2040506a0c969a58f6f9095004c0177a6b47f451530cab38966a25cca5cb58f055542124e",
   431  		wantPacket: &pong{
   432  			To:         rpcEndpoint{net.ParseIP("2001:db8:85a3:8d3:1319:8a2e:370:7348"), 2222, 33338},
   433  			ReplyTok:   common.Hex2Bytes("fbc914b16819237dcd8801d7e53f69e9719adecb3cc0e790c57e91ca4461c954"),
   434  			Expiration: 1136239445,
   435  			Rest:       []rlp.RawValue{{0xC6, 0x01, 0x02, 0x03, 0xC2, 0x04, 0x05}, {0x06}},
   436  		},
   437  	},
   438  	{
   439  		input: "c7c44041b9f7c7e41934417ebac9a8e1a4c6298f74553f2fcfdcae6ed6fe53163eb3d2b52e39fe91831b8a927bf4fc222c3902202027e5e9eb812195f95d20061ef5cd31d502e47ecb61183f74a504fe04c51e73df81f25c4d506b26db4517490103f84eb840ca634cae0d49acb401d8a4c6b6fe8c55b70d115bf400769cc1400f3258cd31387574077f301b421bc84df7266c44e9e6d569fc56be00812904767bf5ccd1fc7f8443b9a35582999983999999280dc62cc8255c73471e0a61da0c89acdc0e035e260add7fc0c04ad9ebf3919644c91cb247affc82b69bd2ca235c71eab8e49737c937a2c396",
   440  		wantPacket: &findnode{
   441  			Target:     hexEncPubkey("ca634cae0d49acb401d8a4c6b6fe8c55b70d115bf400769cc1400f3258cd31387574077f301b421bc84df7266c44e9e6d569fc56be00812904767bf5ccd1fc7f"),
   442  			Expiration: 1136239445,
   443  			Rest:       []rlp.RawValue{{0x82, 0x99, 0x99}, {0x83, 0x99, 0x99, 0x99}},
   444  		},
   445  	},
   446  	{
   447  		input: "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",
   448  		wantPacket: &neighbors{
   449  			Nodes: []rpcNode{
   450  				{
   451  					ID:  hexEncPubkey("3155e1427f85f10a5c9a7755877748041af1bcd8d474ec065eb33df57a97babf54bfd2103575fa829115d224c523596b401065a97f74010610fce76382c0bf32"),
   452  					IP:  net.ParseIP("99.33.22.55").To4(),
   453  					UDP: 4444,
   454  					TCP: 4445,
   455  				},
   456  				{
   457  					ID:  hexEncPubkey("312c55512422cf9b8a4097e9a6ad79402e87a15ae909a4bfefa22398f03d20951933beea1e4dfa6f968212385e829f04c2d314fc2d4e255e0d3bc08792b069db"),
   458  					IP:  net.ParseIP("1.2.3.4").To4(),
   459  					UDP: 1,
   460  					TCP: 1,
   461  				},
   462  				{
   463  					ID:  hexEncPubkey("38643200b172dcfef857492156971f0e6aa2c538d8b74010f8e140811d53b98c765dd2d96126051913f44582e8c199ad7c6d6819e9a56483f637feaac9448aac"),
   464  					IP:  net.ParseIP("2001:db8:3c4d:15::abcd:ef12"),
   465  					UDP: 3333,
   466  					TCP: 3333,
   467  				},
   468  				{
   469  					ID:  hexEncPubkey("8dcab8618c3253b558d459da53bd8fa68935a719aff8b811197101a4b2b47dd2d47295286fc00cc081bb542d760717d1bdd6bec2c37cd72eca367d6dd3b9df73"),
   470  					IP:  net.ParseIP("2001:db8:85a3:8d3:1319:8a2e:370:7348"),
   471  					UDP: 999,
   472  					TCP: 1000,
   473  				},
   474  			},
   475  			Expiration: 1136239445,
   476  			Rest:       []rlp.RawValue{{0x01}, {0x02}, {0x03}},
   477  		},
   478  	},
   479  }
   480  
   481  func TestForwardCompatibility(t *testing.T) {
   482  	testkey, _ := crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
   483  	wantNodeKey := encodePubkey(&testkey.PublicKey)
   484  
   485  	for _, test := range testPackets {
   486  		input, err := hex.DecodeString(test.input)
   487  		if err != nil {
   488  			t.Fatalf("invalid hex: %s", test.input)
   489  		}
   490  		packet, nodekey, _, err := decodePacket(input)
   491  		if err != nil {
   492  			t.Errorf("did not accept packet %s\n%v", test.input, err)
   493  			continue
   494  		}
   495  		if !reflect.DeepEqual(packet, test.wantPacket) {
   496  			t.Errorf("got %s\nwant %s", spew.Sdump(packet), spew.Sdump(test.wantPacket))
   497  		}
   498  		if nodekey != wantNodeKey {
   499  			t.Errorf("got id %v\nwant id %v", nodekey, wantNodeKey)
   500  		}
   501  	}
   502  }
   503  
   504  // dgramPipe is a fake UDP socket. It queues all sent datagrams.
   505  type dgramPipe struct {
   506  	mu      *sync.Mutex
   507  	cond    *sync.Cond
   508  	closing chan struct{}
   509  	closed  bool
   510  	queue   [][]byte
   511  }
   512  
   513  func newpipe() *dgramPipe {
   514  	mu := new(sync.Mutex)
   515  	return &dgramPipe{
   516  		closing: make(chan struct{}),
   517  		cond:    &sync.Cond{L: mu},
   518  		mu:      mu,
   519  	}
   520  }
   521  
   522  // WriteToUDP queues a datagram.
   523  func (c *dgramPipe) WriteToUDP(b []byte, to *net.UDPAddr) (n int, err error) {
   524  	msg := make([]byte, len(b))
   525  	copy(msg, b)
   526  	c.mu.Lock()
   527  	defer c.mu.Unlock()
   528  	if c.closed {
   529  		return 0, errors.New("closed")
   530  	}
   531  	c.queue = append(c.queue, msg)
   532  	c.cond.Signal()
   533  	return len(b), nil
   534  }
   535  
   536  // ReadFromUDP just hangs until the pipe is closed.
   537  func (c *dgramPipe) ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error) {
   538  	<-c.closing
   539  	return 0, nil, io.EOF
   540  }
   541  
   542  func (c *dgramPipe) Close() error {
   543  	c.mu.Lock()
   544  	defer c.mu.Unlock()
   545  	if !c.closed {
   546  		close(c.closing)
   547  		c.closed = true
   548  	}
   549  	return nil
   550  }
   551  
   552  func (c *dgramPipe) LocalAddr() net.Addr {
   553  	return &net.UDPAddr{IP: testLocal.IP, Port: int(testLocal.UDP)}
   554  }
   555  
   556  func (c *dgramPipe) waitPacketOut() []byte {
   557  	c.mu.Lock()
   558  	defer c.mu.Unlock()
   559  	for len(c.queue) == 0 {
   560  		c.cond.Wait()
   561  	}
   562  	p := c.queue[0]
   563  	copy(c.queue, c.queue[1:])
   564  	c.queue = c.queue[:len(c.queue)-1]
   565  	return p
   566  }