aboutsummaryrefslogtreecommitdiffstats
path: root/eth/handler_test.go
blob: 91989cb8f9a7052833e80dd19635b242ab15eb9f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package eth

import (
    "math/big"
    "math/rand"
    "testing"
    "time"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/core/state"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/eth/downloader"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/event"
    "github.com/ethereum/go-ethereum/p2p"
    "github.com/ethereum/go-ethereum/params"
)

// Tests that protocol versions and modes of operations are matched up properly.
func TestProtocolCompatibility(t *testing.T) {
    // Define the compatibility chart
    tests := []struct {
        version    uint
        fastSync   bool
        compatible bool
    }{
        {61, false, true}, {62, false, true}, {63, false, true},
        {61, true, false}, {62, true, false}, {63, true, true},
    }
    // Make sure anything we screw up is restored
    backup := ProtocolVersions
    defer func() { ProtocolVersions = backup }()

    // Try all available compatibility configs and check for errors
    for i, tt := range tests {
        ProtocolVersions = []uint{tt.version}

        pm, err := newTestProtocolManager(tt.fastSync, 0, nil, nil)
        if pm != nil {
            defer pm.Stop()
        }
        if (err == nil && !tt.compatible) || (err != nil && tt.compatible) {
            t.Errorf("test %d: compatibility mismatch: have error %v, want compatibility %v", i, err, tt.compatible)
        }
    }
}

// Tests that block headers can be retrieved from a remote chain based on user queries.
func TestGetBlockHeaders62(t *testing.T) { testGetBlockHeaders(t, 62) }
func TestGetBlockHeaders63(t *testing.T) { testGetBlockHeaders(t, 63) }

func testGetBlockHeaders(t *testing.T, protocol int) {
    pm := newTestProtocolManagerMust(t, false, downloader.MaxHashFetch+15, nil, nil)
    peer, _ := newTestPeer("peer", protocol, pm, true)
    defer peer.close()

    // Create a "random" unknown hash for testing
    var unknown common.Hash
    for i, _ := range unknown {
        unknown[i] = byte(i)
    }
    // Create a batch of tests for various scenarios
    limit := uint64(downloader.MaxHeaderFetch)
    tests := []struct {
        query  *getBlockHeadersData // The query to execute for header retrieval
        expect []common.Hash        // The hashes of the block whose headers are expected
    }{
        // A single random block should be retrievable by hash and number too
        {
            &getBlockHeadersData{Origin: hashOrNumber{Hash: pm.blockchain.GetBlockByNumber(limit / 2).Hash()}, Amount: 1},
            []common.Hash{pm.blockchain.GetBlockByNumber(limit / 2).Hash()},
        }, {
            &getBlockHeadersData{Origin: hashOrNumber{Number: limit / 2}, Amount: 1},
            []common.Hash{pm.blockchain.GetBlockByNumber(limit / 2).Hash()},
        },
        // Multiple headers should be retrievable in both directions
        {
            &getBlockHeadersData{Origin: hashOrNumber{Number: limit / 2}, Amount: 3},
            []common.Hash{
                pm.blockchain.GetBlockByNumber(limit / 2).Hash(),
                pm.blockchain.GetBlockByNumber(limit/2 + 1).Hash(),
                pm.blockchain.GetBlockByNumber(limit/2 + 2).Hash(),
            },
        }, {
            &getBlockHeadersData{Origin: hashOrNumber{Number: limit / 2}, Amount: 3, Reverse: true},
            []common.Hash{
                pm.blockchain.GetBlockByNumber(limit / 2).Hash(),
                pm.blockchain.GetBlockByNumber(limit/2 - 1).Hash(),
                pm.blockchain.GetBlockByNumber(limit/2 - 2).Hash(),
            },
        },
        // Multiple headers with skip lists should be retrievable
        {
            &getBlockHeadersData{Origin: hashOrNumber{Number: limit / 2}, Skip: 3, Amount: 3},
            []common.Hash{
                pm.blockchain.GetBlockByNumber(limit / 2).Hash(),
                pm.blockchain.GetBlockByNumber(limit/2 + 4).Hash(),
                pm.blockchain.GetBlockByNumber(limit/2 + 8).Hash(),
            },
        }, {
            &getBlockHeadersData{Origin: hashOrNumber{Number: limit / 2}, Skip: 3, Amount: 3, Reverse: true},
            []common.Hash{
                pm.blockchain.GetBlockByNumber(limit / 2).Hash(),
                pm.blockchain.GetBlockByNumber(limit/2 - 4).Hash(),
                pm.blockchain.GetBlockByNumber(limit/2 - 8).Hash(),
            },
        },
        // The chain endpoints should be retrievable
        {
            &getBlockHeadersData{Origin: hashOrNumber{Number: 0}, Amount: 1},
            []common.Hash{pm.blockchain.GetBlockByNumber(0).Hash()},
        }, {
            &getBlockHeadersData{Origin: hashOrNumber{Number: pm.blockchain.CurrentBlock().NumberU64()}, Amount: 1},
            []common.Hash{pm.blockchain.CurrentBlock().Hash()},
        },
        // Ensure protocol limits are honored
        {
            &getBlockHeadersData{Origin: hashOrNumber{Number: pm.blockchain.CurrentBlock().NumberU64() - 1}, Amount: limit + 10, Reverse: true},
            pm.blockchain.GetBlockHashesFromHash(pm.blockchain.CurrentBlock().Hash(), limit),
        },
        // Check that requesting more than available is handled gracefully
        {
            &getBlockHeadersData{Origin: hashOrNumber{Number: pm.blockchain.CurrentBlock().NumberU64() - 4}, Skip: 3, Amount: 3},
            []common.Hash{
                pm.blockchain.GetBlockByNumber(pm.blockchain.CurrentBlock().NumberU64() - 4).Hash(),
                pm.blockchain.GetBlockByNumber(pm.blockchain.CurrentBlock().NumberU64()).Hash(),
            },
        }, {
            &getBlockHeadersData{Origin: hashOrNumber{Number: 4}, Skip: 3, Amount: 3, Reverse: true},
            []common.Hash{
                pm.blockchain.GetBlockByNumber(4).Hash(),
                pm.blockchain.GetBlockByNumber(0).Hash(),
            },
        },
        // Check that requesting more than available is handled gracefully, even if mid skip
        {
            &getBlockHeadersData{Origin: hashOrNumber{Number: pm.blockchain.CurrentBlock().NumberU64() - 4}, Skip: 2, Amount: 3},
            []common.Hash{
                pm.blockchain.GetBlockByNumber(pm.blockchain.CurrentBlock().NumberU64() - 4).Hash(),
                pm.blockchain.GetBlockByNumber(pm.blockchain.CurrentBlock().NumberU64() - 1).Hash(),
            },
        }, {
            &getBlockHeadersData{Origin: hashOrNumber{Number: 4}, Skip: 2, Amount: 3, Reverse: true},
            []common.Hash{
                pm.blockchain.GetBlockByNumber(4).Hash(),
                pm.blockchain.GetBlockByNumber(1).Hash(),
            },
        },
        // Check a corner case where requesting more can iterate past the endpoints
        {
            &getBlockHeadersData{Origin: hashOrNumber{Number: 2}, Amount: 5, Reverse: true},
            []common.Hash{
                pm.blockchain.GetBlockByNumber(2).Hash(),
                pm.blockchain.GetBlockByNumber(1).Hash(),
                pm.blockchain.GetBlockByNumber(0).Hash(),
            },
        },
        // Check that non existing headers aren't returned
        {
            &getBlockHeadersData{Origin: hashOrNumber{Hash: unknown}, Amount: 1},
            []common.Hash{},
        }, {
            &getBlockHeadersData{Origin: hashOrNumber{Number: pm.blockchain.CurrentBlock().NumberU64() + 1}, Amount: 1},
            []common.Hash{},
        },
    }
    // Run each of the tests and verify the results against the chain
    for i, tt := range tests {
        // Collect the headers to expect in the response
        headers := []*types.Header{}
        for _, hash := range tt.expect {
            headers = append(headers, pm.blockchain.GetBlockByHash(hash).Header())
        }
        // Send the hash request and verify the response
        p2p.Send(peer.app, 0x03, tt.query)
        if err := p2p.ExpectMsg(peer.app, 0x04, headers); err != nil {
            t.Errorf("test %d: headers mismatch: %v", i, err)
        }
        // If the test used number origins, repeat with hashes as the too
        if tt.query.Origin.Hash == (common.Hash{}) {
            if origin := pm.blockchain.GetBlockByNumber(tt.query.Origin.Number); origin != nil {
                tt.query.Origin.Hash, tt.query.Origin.Number = origin.Hash(), 0

                p2p.Send(peer.app, 0x03, tt.query)
                if err := p2p.ExpectMsg(peer.app, 0x04, headers); err != nil {
                    t.Errorf("test %d: headers mismatch: %v", i, err)
                }
            }
        }
    }
}

// Tests that block contents can be retrieved from a remote chain based on their hashes.
func TestGetBlockBodies62(t *testing.T) { testGetBlockBodies(t, 62) }
func TestGetBlockBodies63(t *testing.T) { testGetBlockBodies(t, 63) }

func testGetBlockBodies(t *testing.T, protocol int) {
    pm := newTestProtocolManagerMust(t, false, downloader.MaxBlockFetch+15, nil, nil)
    peer, _ := newTestPeer("peer", protocol, pm, true)
    defer peer.close()

    // Create a batch of tests for various scenarios
    limit := downloader.MaxBlockFetch
    tests := []struct {
        random    int           // Number of blocks to fetch randomly from the chain
        explicit  []common.Hash // Explicitly requested blocks
        available []bool        // Availability of explicitly requested blocks
        expected  int           // Total number of existing blocks to expect
    }{
        {1, nil, nil, 1},                                                         // A single random block should be retrievable
        {10, nil, nil, 10},                                                       // Multiple random blocks should be retrievable
        {limit, nil, nil, limit},                                                 // The maximum possible blocks should be retrievable
        {limit + 1, nil, nil, limit},                                             // No more than the possible block count should be returned
        {0, []common.Hash{pm.blockchain.Genesis().Hash()}, []bool{true}, 1},      // The genesis block should be retrievable
        {0, []common.Hash{pm.blockchain.CurrentBlock().Hash()}, []bool{true}, 1}, // The chains head block should be retrievable
        {0, []common.Hash{common.Hash{}}, []bool{false}, 0},                      // A non existent block should not be returned

        // Existing and non-existing blocks interleaved should not cause problems
        {0, []common.Hash{
            common.Hash{},
            pm.blockchain.GetBlockByNumber(1).Hash(),
            common.Hash{},
            pm.blockchain.GetBlockByNumber(10).Hash(),
            common.Hash{},
            pm.blockchain.GetBlockByNumber(100).Hash(),
            common.Hash{},
        }, []bool{false, true, false, true, false, true, false}, 3},
    }
    // Run each of the tests and verify the results against the chain
    for i, tt := range tests {
        // Collect the hashes to request, and the response to expect
        hashes, seen := []common.Hash{}, make(map[int64]bool)
        bodies := []*blockBody{}

        for j := 0; j < tt.random; j++ {
            for {
                num := rand.Int63n(int64(pm.blockchain.CurrentBlock().NumberU64()))
                if !seen[num] {
                    seen[num] = true

                    block := pm.blockchain.GetBlockByNumber(uint64(num))
                    hashes = append(hashes, block.Hash())
                    if len(bodies) < tt.expected {
                        bodies = append(bodies, &blockBody{Transactions: block.Transactions(), Uncles: block.Uncles()})
                    }
                    break
                }
            }
        }
        for j, hash := range tt.explicit {
            hashes = append(hashes, hash)
            if tt.available[j] && len(bodies) < tt.expected {
                block := pm.blockchain.GetBlockByHash(hash)
                bodies = append(bodies, &blockBody{Transactions: block.Transactions(), Uncles: block.Uncles()})
            }
        }
        // Send the hash request and verify the response
        p2p.Send(peer.app, 0x05, hashes)
        if err := p2p.ExpectMsg(peer.app, 0x06, bodies); err != nil {
            t.Errorf("test %d: bodies mismatch: %v", i, err)
        }
    }
}

// Tests that the node state database can be retrieved based on hashes.
func TestGetNodeData63(t *testing.T) { testGetNodeData(t, 63) }

func testGetNodeData(t *testing.T, protocol int) {
    // Define three accounts to simulate transactions with
    acc1Key, _ := crypto.HexToECDSA("8a1f9a8f95be41cd7ccb6168179afb4504aefe388d1e14474d32c45c72ce7b7a")
    acc2Key, _ := crypto.HexToECDSA("49a7b37aa6f6645917e7b807e9d1c00d4fa71f18343b0d4122a4d2df64dd6fee")
    acc1Addr := crypto.PubkeyToAddress(acc1Key.PublicKey)
    acc2Addr := crypto.PubkeyToAddress(acc2Key.PublicKey)

    // Create a chain generator with some simple transactions (blatantly stolen from @fjl/chain_markets_test)
    generator := func(i int, block *core.BlockGen) {
        switch i {
        case 0:
            // In block 1, the test bank sends account #1 some ether.
            tx, _ := types.NewTransaction(block.TxNonce(testBank.Address), acc1Addr, big.NewInt(10000), params.TxGas, nil, nil).SignECDSA(testBankKey)
            block.AddTx(tx)
        case 1:
            // In block 2, the test bank sends some more ether to account #1.
            // acc1Addr passes it on to account #2.
            tx1, _ := types.NewTransaction(block.TxNonce(testBank.Address), acc1Addr, big.NewInt(1000), params.TxGas, nil, nil).SignECDSA(testBankKey)
            tx2, _ := types.NewTransaction(block.TxNonce(acc1Addr), acc2Addr, big.NewInt(1000), params.TxGas, nil, nil).SignECDSA(acc1Key)
            block.AddTx(tx1)
            block.AddTx(tx2)
        case 2:
            // Block 3 is empty but was mined by account #2.
            block.SetCoinbase(acc2Addr)
            block.SetExtra([]byte("yeehaw"))
        case 3:
            // Block 4 includes blocks 2 and 3 as uncle headers (with modified extra data).
            b2 := block.PrevBlock(1).Header()
            b2.Extra = []byte("foo")
            block.AddUncle(b2)
            b3 := block.PrevBlock(2).Header()
            b3.Extra = []byte("foo")
            block.AddUncle(b3)
        }
    }
    // Assemble the test environment
    pm := newTestProtocolManagerMust(t, false, 4, generator, nil)
    peer, _ := newTestPeer("peer", protocol, pm, true)
    defer peer.close()

    // Fetch for now the entire chain db
    hashes := []common.Hash{}
    for _, key := range pm.chaindb.(*ethdb.MemDatabase).Keys() {
        if len(key) == len(common.Hash{}) {
            hashes = append(hashes, common.BytesToHash(key))
        }
    }
    p2p.Send(peer.app, 0x0d, hashes)
    msg, err := peer.app.ReadMsg()
    if err != nil {
        t.Fatalf("failed to read node data response: %v", err)
    }
    if msg.Code != 0x0e {
        t.Fatalf("response packet code mismatch: have %x, want %x", msg.Code, 0x0c)
    }
    var data [][]byte
    if err := msg.Decode(&data); err != nil {
        t.Fatalf("failed to decode response node data: %v", err)
    }
    // Verify that all hashes correspond to the requested data, and reconstruct a state tree
    for i, want := range hashes {
        if hash := crypto.Keccak256Hash(data[i]); hash != want {
            t.Errorf("data hash mismatch: have %x, want %x", hash, want)
        }
    }
    statedb, _ := ethdb.NewMemDatabase()
    for i := 0; i < len(data); i++ {
        statedb.Put(hashes[i].Bytes(), data[i])
    }
    accounts := []common.Address{testBank.Address, acc1Addr, acc2Addr}
    for i := uint64(0); i <= pm.blockchain.CurrentBlock().NumberU64(); i++ {
        trie, _ := state.New(pm.blockchain.GetBlockByNumber(i).Root(), statedb)

        for j, acc := range accounts {
            state, _ := pm.blockchain.State()
            bw := state.GetBalance(acc)
            bh := trie.GetBalance(acc)

            if (bw != nil && bh == nil) || (bw == nil && bh != nil) {
                t.Errorf("test %d, account %d: balance mismatch: have %v, want %v", i, j, bh, bw)
            }
            if bw != nil && bh != nil && bw.Cmp(bw) != 0 {
                t.Errorf("test %d, account %d: balance mismatch: have %v, want %v", i, j, bh, bw)
            }
        }
    }
}

// Tests that the transaction receipts can be retrieved based on hashes.
func TestGetReceipt63(t *testing.T) { testGetReceipt(t, 63) }

func testGetReceipt(t *testing.T, protocol int) {
    // Define three accounts to simulate transactions with
    acc1Key, _ := crypto.HexToECDSA("8a1f9a8f95be41cd7ccb6168179afb4504aefe388d1e14474d32c45c72ce7b7a")
    acc2Key, _ := crypto.HexToECDSA("49a7b37aa6f6645917e7b807e9d1c00d4fa71f18343b0d4122a4d2df64dd6fee")
    acc1Addr := crypto.PubkeyToAddress(acc1Key.PublicKey)
    acc2Addr := crypto.PubkeyToAddress(acc2Key.PublicKey)

    // Create a chain generator with some simple transactions (blatantly stolen from @fjl/chain_markets_test)
    generator := func(i int, block *core.BlockGen) {
        switch i {
        case 0:
            // In block 1, the test bank sends account #1 some ether.
            tx, _ := types.NewTransaction(block.TxNonce(testBank.Address), acc1Addr, big.NewInt(10000), params.TxGas, nil, nil).SignECDSA(testBankKey)
            block.AddTx(tx)
        case 1:
            // In block 2, the test bank sends some more ether to account #1.
            // acc1Addr passes it on to account #2.
            tx1, _ := types.NewTransaction(block.TxNonce(testBank.Address), acc1Addr, big.NewInt(1000), params.TxGas, nil, nil).SignECDSA(testBankKey)
            tx2, _ := types.NewTransaction(block.TxNonce(acc1Addr), acc2Addr, big.NewInt(1000), params.TxGas, nil, nil).SignECDSA(acc1Key)
            block.AddTx(tx1)
            block.AddTx(tx2)
        case 2:
            // Block 3 is empty but was mined by account #2.
            block.SetCoinbase(acc2Addr)
            block.SetExtra([]byte("yeehaw"))
        case 3:
            // Block 4 includes blocks 2 and 3 as uncle headers (with modified extra data).
            b2 := block.PrevBlock(1).Header()
            b2.Extra = []byte("foo")
            block.AddUncle(b2)
            b3 := block.PrevBlock(2).Header()
            b3.Extra = []byte("foo")
            block.AddUncle(b3)
        }
    }
    // Assemble the test environment
    pm := newTestProtocolManagerMust(t, false, 4, generator, nil)
    peer, _ := newTestPeer("peer", protocol, pm, true)
    defer peer.close()

    // Collect the hashes to request, and the response to expect
    hashes, receipts := []common.Hash{}, []types.Receipts{}
    for i := uint64(0); i <= pm.blockchain.CurrentBlock().NumberU64(); i++ {
        block := pm.blockchain.GetBlockByNumber(i)

        hashes = append(hashes, block.Hash())
        receipts = append(receipts, core.GetBlockReceipts(pm.chaindb, block.Hash(), block.NumberU64()))
    }
    // Send the hash request and verify the response
    p2p.Send(peer.app, 0x0f, hashes)
    if err := p2p.ExpectMsg(peer.app, 0x10, receipts); err != nil {
        t.Errorf("receipts mismatch: %v", err)
    }
}

// Tests that post eth protocol handshake, DAO fork-enabled clients also execute
// a DAO "challenge" verifying each others' DAO fork headers to ensure they're on
// compatible chains.
func TestDAOChallengeNoVsNo(t *testing.T)       { testDAOChallenge(t, false, false, false) }
func TestDAOChallengeNoVsPro(t *testing.T)      { testDAOChallenge(t, false, true, false) }
func TestDAOChallengeProVsNo(t *testing.T)      { testDAOChallenge(t, true, false, false) }
func TestDAOChallengeProVsPro(t *testing.T)     { testDAOChallenge(t, true, true, false) }
func TestDAOChallengeNoVsTimeout(t *testing.T)  { testDAOChallenge(t, false, false, true) }
func TestDAOChallengeProVsTimeout(t *testing.T) { testDAOChallenge(t, true, true, true) }

func testDAOChallenge(t *testing.T, localForked, remoteForked bool, timeout bool) {
    // Reduce the DAO handshake challenge timeout
    if timeout {
        defer func(old time.Duration) { daoChallengeTimeout = old }(daoChallengeTimeout)
        daoChallengeTimeout = 500 * time.Millisecond
    }
    // Create a DAO aware protocol manager
    var (
        evmux         = new(event.TypeMux)
        pow           = new(core.FakePow)
        db, _         = ethdb.NewMemDatabase()
        genesis       = core.WriteGenesisBlockForTesting(db)
        config        = &core.ChainConfig{DAOForkBlock: big.NewInt(1), DAOForkSupport: localForked}
        blockchain, _ = core.NewBlockChain(db, config, pow, evmux)
    )
    pm, err := NewProtocolManager(config, false, NetworkId, evmux, new(testTxPool), pow, blockchain, db)
    if err != nil {
        t.Fatalf("failed to start test protocol manager: %v", err)
    }
    pm.Start()
    defer pm.Stop()

    // Connect a new peer and check that we receive the DAO challenge
    peer, _ := newTestPeer("peer", eth63, pm, true)
    defer peer.close()

    challenge := &getBlockHeadersData{
        Origin:  hashOrNumber{Number: config.DAOForkBlock.Uint64()},
        Amount:  1,
        Skip:    0,
        Reverse: false,
    }
    if err := p2p.ExpectMsg(peer.app, GetBlockHeadersMsg, challenge); err != nil {
        t.Fatalf("challenge mismatch: %v", err)
    }
    // Create a block to reply to the challenge if no timeout is simualted
    if !timeout {
        blocks, _ := core.GenerateChain(nil, genesis, db, 1, func(i int, block *core.BlockGen) {
            if remoteForked {
                block.SetExtra(params.DAOForkBlockExtra)
            }
        })
        if err := p2p.Send(peer.app, BlockHeadersMsg, []*types.Header{blocks[0].Header()}); err != nil {
            t.Fatalf("failed to answer challenge: %v", err)
        }
        time.Sleep(100 * time.Millisecond) // Sleep to avoid the verification racing with the drops
    } else {
        // Otherwise wait until the test timeout passes
        time.Sleep(daoChallengeTimeout + 500*time.Millisecond)
    }
    // Verify that depending on fork side, the remote peer is maintained or dropped
    if localForked == remoteForked && !timeout {
        if peers := pm.peers.Len(); peers != 1 {
            t.Fatalf("peer count mismatch: have %d, want %d", peers, 1)
        }
    } else {
        if peers := pm.peers.Len(); peers != 0 {
            t.Fatalf("peer count mismatch: have %d, want %d", peers, 0)
        }
    }
}