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eth/downloader: bound fork ancestry and allow heavy short forks

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This commit is contained in:
Péter Szilágyi 2016-05-13 12:12:13 +02:00
parent 72e60dea36
commit 39ce85cf5d
2 changed files with 200 additions and 42 deletions
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68
eth/downloader/downloader.go
View File

@ -34,6 +34,7 @@ import (
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/params"
"github.com/rcrowley/go-metrics"
)
@ -45,6 +46,8 @@ var (
MaxReceiptFetch = 256 // Amount of transaction receipts to allow fetching per request
MaxStateFetch = 384 // Amount of node state values to allow fetching per request
MaxForkAncestry = 3 * params.EpochDuration.Uint64() // Maximum chain reorganisation
hashTTL = 3 * time.Second // [eth/61] Time it takes for a hash request to time out
blockTargetRTT = 3 * time.Second / 2 // [eth/61] Target time for completing a block retrieval request
blockTTL = 3 * blockTargetRTT // [eth/61] Maximum time allowance before a block request is considered expired
@ -79,6 +82,7 @@ var (
errEmptyHeaderSet = errors.New("empty header set by peer")
errPeersUnavailable = errors.New("no peers available or all tried for download")
errAlreadyInPool = errors.New("hash already in pool")
errInvalidAncestor = errors.New("retrieved ancestor is invalid")
errInvalidChain = errors.New("retrieved hash chain is invalid")
errInvalidBlock = errors.New("retrieved block is invalid")
errInvalidBody = errors.New("retrieved block body is invalid")
@ -266,7 +270,7 @@ func (d *Downloader) Synchronise(id string, head common.Hash, td *big.Int, mode
case errBusy:
glog.V(logger.Detail).Infof("Synchronisation already in progress")
case errTimeout, errBadPeer, errStallingPeer, errEmptyHashSet, errEmptyHeaderSet, errPeersUnavailable, errInvalidChain:
case errTimeout, errBadPeer, errStallingPeer, errEmptyHashSet, errEmptyHeaderSet, errPeersUnavailable, errInvalidAncestor, errInvalidChain:
glog.V(logger.Debug).Infof("Removing peer %v: %v", id, err)
d.dropPeer(id)
@ -353,7 +357,7 @@ func (d *Downloader) syncWithPeer(p *peer, hash common.Hash, td *big.Int) (err e
if err != nil {
return err
}
origin, err := d.findAncestor61(p)
origin, err := d.findAncestor61(p, latest)
if err != nil {
return err
}
@ -380,7 +384,7 @@ func (d *Downloader) syncWithPeer(p *peer, hash common.Hash, td *big.Int) (err e
if err != nil {
return err
}
origin, err := d.findAncestor(p)
origin, err := d.findAncestor(p, latest)
if err != nil {
return err
}
@ -536,11 +540,19 @@ func (d *Downloader) fetchHeight61(p *peer) (uint64, error) {
// on the correct chain, checking the top N blocks should already get us a match.
// In the rare scenario when we ended up on a long reorganisation (i.e. none of
// the head blocks match), we do a binary search to find the common ancestor.
func (d *Downloader) findAncestor61(p *peer) (uint64, error) {
func (d *Downloader) findAncestor61(p *peer, height uint64) (uint64, error) {
glog.V(logger.Debug).Infof("%v: looking for common ancestor", p)
// Request out head blocks to short circuit ancestor location
head := d.headBlock().NumberU64()
// Figure out the valid ancestor range to prevent rewrite attacks
floor, ceil := int64(-1), d.headBlock().NumberU64()
if ceil >= MaxForkAncestry {
floor = int64(ceil - MaxForkAncestry)
}
// Request the topmost blocks to short circuit binary ancestor lookup
head := ceil
if head > height {
head = height
}
from := int64(head) - int64(MaxHashFetch) + 1
if from < 0 {
from = 0
@ -600,11 +612,18 @@ func (d *Downloader) findAncestor61(p *peer) (uint64, error) {
}
// If the head fetch already found an ancestor, return
if !common.EmptyHash(hash) {
if int64(number) <= floor {
glog.V(logger.Warn).Infof("%v: potential rewrite attack: #%d [%x…] <= #%d limit", p, number, hash[:4], floor)
return 0, errInvalidAncestor
}
glog.V(logger.Debug).Infof("%v: common ancestor: #%d [%x…]", p, number, hash[:4])
return number, nil
}
// Ancestor not found, we need to binary search over our chain
start, end := uint64(0), head
if floor > 0 {
start = uint64(floor)
}
for start+1 < end {
// Split our chain interval in two, and request the hash to cross check
check := (start + end) / 2
@ -660,6 +679,12 @@ func (d *Downloader) findAncestor61(p *peer) (uint64, error) {
}
}
}
// Ensure valid ancestry and return
if int64(start) <= floor {
glog.V(logger.Warn).Infof("%v: potential rewrite attack: #%d [%x…] <= #%d limit", p, start, hash[:4], floor)
return 0, errInvalidAncestor
}
glog.V(logger.Debug).Infof("%v: common ancestor: #%d [%x…]", p, start, hash[:4])
return start, nil
}
@ -961,15 +986,23 @@ func (d *Downloader) fetchHeight(p *peer) (uint64, error) {
// on the correct chain, checking the top N links should already get us a match.
// In the rare scenario when we ended up on a long reorganisation (i.e. none of
// the head links match), we do a binary search to find the common ancestor.
func (d *Downloader) findAncestor(p *peer) (uint64, error) {
func (d *Downloader) findAncestor(p *peer, height uint64) (uint64, error) {
glog.V(logger.Debug).Infof("%v: looking for common ancestor", p)
// Request our head headers to short circuit ancestor location
head := d.headHeader().Number.Uint64()
// Figure out the valid ancestor range to prevent rewrite attacks
floor, ceil := int64(-1), d.headHeader().Number.Uint64()
if d.mode == FullSync {
head = d.headBlock().NumberU64()
ceil = d.headBlock().NumberU64()
} else if d.mode == FastSync {
head = d.headFastBlock().NumberU64()
ceil = d.headFastBlock().NumberU64()
}
if ceil >= MaxForkAncestry {
floor = int64(ceil - MaxForkAncestry)
}
// Request the topmost blocks to short circuit binary ancestor lookup
head := ceil
if head > height {
head = height
}
from := int64(head) - int64(MaxHeaderFetch) + 1
if from < 0 {
@ -1040,11 +1073,18 @@ func (d *Downloader) findAncestor(p *peer) (uint64, error) {
}
// If the head fetch already found an ancestor, return
if !common.EmptyHash(hash) {
if int64(number) <= floor {
glog.V(logger.Warn).Infof("%v: potential rewrite attack: #%d [%x…] <= #%d limit", p, number, hash[:4], floor)
return 0, errInvalidAncestor
}
glog.V(logger.Debug).Infof("%v: common ancestor: #%d [%x…]", p, number, hash[:4])
return number, nil
}
// Ancestor not found, we need to binary search over our chain
start, end := uint64(0), head
if floor > 0 {
start = uint64(floor)
}
for start+1 < end {
// Split our chain interval in two, and request the hash to cross check
check := (start + end) / 2
@ -1100,6 +1140,12 @@ func (d *Downloader) findAncestor(p *peer) (uint64, error) {
}
}
}
// Ensure valid ancestry and return
if int64(start) <= floor {
glog.V(logger.Warn).Infof("%v: potential rewrite attack: #%d [%x…] <= #%d limit", p, start, hash[:4], floor)
return 0, errInvalidAncestor
}
glog.V(logger.Debug).Infof("%v: common ancestor: #%d [%x…]", p, start, hash[:4])
return start, nil
}

174
eth/downloader/downloader_test.go
View File

@ -43,8 +43,9 @@ var (
genesis = core.GenesisBlockForTesting(testdb, testAddress, big.NewInt(1000000000))
)
// Reduce the block cache limit, otherwise the tests will be very heavy.
// Reduce some of the parameters to make the tester faster.
func init() {
MaxForkAncestry = uint64(10000)
blockCacheLimit = 1024
}
@ -52,11 +53,15 @@ func init() {
// the returned hash chain is ordered head->parent. In addition, every 3rd block
// contains a transaction and every 5th an uncle to allow testing correct block
// reassembly.
func makeChain(n int, seed byte, parent *types.Block, parentReceipts types.Receipts) ([]common.Hash, map[common.Hash]*types.Header, map[common.Hash]*types.Block, map[common.Hash]types.Receipts) {
func makeChain(n int, seed byte, parent *types.Block, parentReceipts types.Receipts, heavy bool) ([]common.Hash, map[common.Hash]*types.Header, map[common.Hash]*types.Block, map[common.Hash]types.Receipts) {
// Generate the block chain
blocks, receipts := core.GenerateChain(parent, testdb, n, func(i int, block *core.BlockGen) {
block.SetCoinbase(common.Address{seed})
// If a heavy chain is requested, delay blocks to raise difficulty
if heavy {
block.OffsetTime(-1)
}
// If the block number is multiple of 3, send a bonus transaction to the miner
if parent == genesis && i%3 == 0 {
tx, err := types.NewTransaction(block.TxNonce(testAddress), common.Address{seed}, big.NewInt(1000), params.TxGas, nil, nil).SignECDSA(testKey)
@ -97,15 +102,19 @@ func makeChain(n int, seed byte, parent *types.Block, parentReceipts types.Recei
// makeChainFork creates two chains of length n, such that h1[:f] and
// h2[:f] are different but have a common suffix of length n-f.
func makeChainFork(n, f int, parent *types.Block, parentReceipts types.Receipts) ([]common.Hash, []common.Hash, map[common.Hash]*types.Header, map[common.Hash]*types.Header, map[common.Hash]*types.Block, map[common.Hash]*types.Block, map[common.Hash]types.Receipts, map[common.Hash]types.Receipts) {
func makeChainFork(n, f int, parent *types.Block, parentReceipts types.Receipts, balanced bool) ([]common.Hash, []common.Hash, map[common.Hash]*types.Header, map[common.Hash]*types.Header, map[common.Hash]*types.Block, map[common.Hash]*types.Block, map[common.Hash]types.Receipts, map[common.Hash]types.Receipts) {
// Create the common suffix
hashes, headers, blocks, receipts := makeChain(n-f, 0, parent, parentReceipts)
hashes, headers, blocks, receipts := makeChain(n-f, 0, parent, parentReceipts, false)
// Create the forks
hashes1, headers1, blocks1, receipts1 := makeChain(f, 1, blocks[hashes[0]], receipts[hashes[0]])
// Create the forks, making the second heavyer if non balanced forks were requested
hashes1, headers1, blocks1, receipts1 := makeChain(f, 1, blocks[hashes[0]], receipts[hashes[0]], false)
hashes1 = append(hashes1, hashes[1:]...)
hashes2, headers2, blocks2, receipts2 := makeChain(f, 2, blocks[hashes[0]], receipts[hashes[0]])
heavy := false
if !balanced {
heavy = true
}
hashes2, headers2, blocks2, receipts2 := makeChain(f, 2, blocks[hashes[0]], receipts[hashes[0]], heavy)
hashes2 = append(hashes2, hashes[1:]...)
for hash, header := range headers {
@ -712,7 +721,7 @@ func testCanonicalSynchronisation(t *testing.T, protocol int, mode SyncMode) {
// Create a small enough block chain to download
targetBlocks := blockCacheLimit - 15
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil)
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil, false)
tester := newTester()
tester.newPeer("peer", protocol, hashes, headers, blocks, receipts)
@ -736,7 +745,7 @@ func TestThrottling64Fast(t *testing.T) { testThrottling(t, 64, FastSync) }
func testThrottling(t *testing.T, protocol int, mode SyncMode) {
// Create a long block chain to download and the tester
targetBlocks := 8 * blockCacheLimit
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil)
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil, false)
tester := newTester()
tester.newPeer("peer", protocol, hashes, headers, blocks, receipts)
@ -810,20 +819,20 @@ func testThrottling(t *testing.T, protocol int, mode SyncMode) {
// Tests that simple synchronization against a forked chain works correctly. In
// this test common ancestor lookup should *not* be short circuited, and a full
// binary search should be executed.
func TestForkedSynchronisation61(t *testing.T) { testForkedSynchronisation(t, 61, FullSync) }
func TestForkedSynchronisation62(t *testing.T) { testForkedSynchronisation(t, 62, FullSync) }
func TestForkedSynchronisation63Full(t *testing.T) { testForkedSynchronisation(t, 63, FullSync) }
func TestForkedSynchronisation63Fast(t *testing.T) { testForkedSynchronisation(t, 63, FastSync) }
func TestForkedSynchronisation64Full(t *testing.T) { testForkedSynchronisation(t, 64, FullSync) }
func TestForkedSynchronisation64Fast(t *testing.T) { testForkedSynchronisation(t, 64, FastSync) }
func TestForkedSynchronisation64Light(t *testing.T) { testForkedSynchronisation(t, 64, LightSync) }
func TestForkedSync61(t *testing.T) { testForkedSync(t, 61, FullSync) }
func TestForkedSync62(t *testing.T) { testForkedSync(t, 62, FullSync) }
func TestForkedSync63Full(t *testing.T) { testForkedSync(t, 63, FullSync) }
func TestForkedSync63Fast(t *testing.T) { testForkedSync(t, 63, FastSync) }
func TestForkedSync64Full(t *testing.T) { testForkedSync(t, 64, FullSync) }
func TestForkedSync64Fast(t *testing.T) { testForkedSync(t, 64, FastSync) }
func TestForkedSync64Light(t *testing.T) { testForkedSync(t, 64, LightSync) }
func testForkedSynchronisation(t *testing.T, protocol int, mode SyncMode) {
func testForkedSync(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
// Create a long enough forked chain
common, fork := MaxHashFetch, 2*MaxHashFetch
hashesA, hashesB, headersA, headersB, blocksA, blocksB, receiptsA, receiptsB := makeChainFork(common+fork, fork, genesis, nil)
hashesA, hashesB, headersA, headersB, blocksA, blocksB, receiptsA, receiptsB := makeChainFork(common+fork, fork, genesis, nil, true)
tester := newTester()
tester.newPeer("fork A", protocol, hashesA, headersA, blocksA, receiptsA)
@ -842,6 +851,40 @@ func testForkedSynchronisation(t *testing.T, protocol int, mode SyncMode) {
assertOwnForkedChain(t, tester, common+1, []int{common + fork + 1, common + fork + 1})
}
// Tests that synchronising against a much shorter but much heavyer fork works
// corrently and is not dropped.
func TestHeavyForkedSync61(t *testing.T) { testHeavyForkedSync(t, 61, FullSync) }
func TestHeavyForkedSync62(t *testing.T) { testHeavyForkedSync(t, 62, FullSync) }
func TestHeavyForkedSync63Full(t *testing.T) { testHeavyForkedSync(t, 63, FullSync) }
func TestHeavyForkedSync63Fast(t *testing.T) { testHeavyForkedSync(t, 63, FastSync) }
func TestHeavyForkedSync64Full(t *testing.T) { testHeavyForkedSync(t, 64, FullSync) }
func TestHeavyForkedSync64Fast(t *testing.T) { testHeavyForkedSync(t, 64, FastSync) }
func TestHeavyForkedSync64Light(t *testing.T) { testHeavyForkedSync(t, 64, LightSync) }
func testHeavyForkedSync(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
// Create a long enough forked chain
common, fork := MaxHashFetch, 4*MaxHashFetch
hashesA, hashesB, headersA, headersB, blocksA, blocksB, receiptsA, receiptsB := makeChainFork(common+fork, fork, genesis, nil, false)
tester := newTester()
tester.newPeer("light", protocol, hashesA, headersA, blocksA, receiptsA)
tester.newPeer("heavy", protocol, hashesB[fork/2:], headersB, blocksB, receiptsB)
// Synchronise with the peer and make sure all blocks were retrieved
if err := tester.sync("light", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnChain(t, tester, common+fork+1)
// Synchronise with the second peer and make sure that fork is pulled too
if err := tester.sync("heavy", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnForkedChain(t, tester, common+1, []int{common + fork + 1, common + fork/2 + 1})
}
// Tests that an inactive downloader will not accept incoming hashes and blocks.
func TestInactiveDownloader61(t *testing.T) {
t.Parallel()
@ -856,6 +899,74 @@ func TestInactiveDownloader61(t *testing.T) {
}
}
// Tests that chain forks are contained within a certain interval of the current
// chain head, ensuring that malicious peers cannot waste resources by feeding
// long dead chains.
func TestBoundedForkedSync61(t *testing.T) { testBoundedForkedSync(t, 61, FullSync) }
func TestBoundedForkedSync62(t *testing.T) { testBoundedForkedSync(t, 62, FullSync) }
func TestBoundedForkedSync63Full(t *testing.T) { testBoundedForkedSync(t, 63, FullSync) }
func TestBoundedForkedSync63Fast(t *testing.T) { testBoundedForkedSync(t, 63, FastSync) }
func TestBoundedForkedSync64Full(t *testing.T) { testBoundedForkedSync(t, 64, FullSync) }
func TestBoundedForkedSync64Fast(t *testing.T) { testBoundedForkedSync(t, 64, FastSync) }
func TestBoundedForkedSync64Light(t *testing.T) { testBoundedForkedSync(t, 64, LightSync) }
func testBoundedForkedSync(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
// Create a long enough forked chain
common, fork := 13, int(MaxForkAncestry+17)
hashesA, hashesB, headersA, headersB, blocksA, blocksB, receiptsA, receiptsB := makeChainFork(common+fork, fork, genesis, nil, true)
tester := newTester()
tester.newPeer("original", protocol, hashesA, headersA, blocksA, receiptsA)
tester.newPeer("rewriter", protocol, hashesB, headersB, blocksB, receiptsB)
// Synchronise with the peer and make sure all blocks were retrieved
if err := tester.sync("original", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnChain(t, tester, common+fork+1)
// Synchronise with the second peer and ensure that the fork is rejected to being too old
if err := tester.sync("rewriter", nil, mode); err != errInvalidAncestor {
t.Fatalf("sync failure mismatch: have %v, want %v", err, errInvalidAncestor)
}
}
// Tests that chain forks are contained within a certain interval of the current
// chain head for short but heavy forks too. These are a bit special because they
// take different ancestor lookup paths.
func TestBoundedHeavyForkedSync61(t *testing.T) { testBoundedHeavyForkedSync(t, 61, FullSync) }
func TestBoundedHeavyForkedSync62(t *testing.T) { testBoundedHeavyForkedSync(t, 62, FullSync) }
func TestBoundedHeavyForkedSync63Full(t *testing.T) { testBoundedHeavyForkedSync(t, 63, FullSync) }
func TestBoundedHeavyForkedSync63Fast(t *testing.T) { testBoundedHeavyForkedSync(t, 63, FastSync) }
func TestBoundedHeavyForkedSync64Full(t *testing.T) { testBoundedHeavyForkedSync(t, 64, FullSync) }
func TestBoundedHeavyForkedSync64Fast(t *testing.T) { testBoundedHeavyForkedSync(t, 64, FastSync) }
func TestBoundedHeavyForkedSync64Light(t *testing.T) { testBoundedHeavyForkedSync(t, 64, LightSync) }
func testBoundedHeavyForkedSync(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
// Create a long enough forked chain
common, fork := 13, int(MaxForkAncestry+17)
hashesA, hashesB, headersA, headersB, blocksA, blocksB, receiptsA, receiptsB := makeChainFork(common+fork, fork, genesis, nil, false)
tester := newTester()
tester.newPeer("original", protocol, hashesA, headersA, blocksA, receiptsA)
tester.newPeer("heavy-rewriter", protocol, hashesB[MaxForkAncestry-17:], headersB, blocksB, receiptsB) // Root the fork below the ancestor limit
// Synchronise with the peer and make sure all blocks were retrieved
if err := tester.sync("original", nil, mode); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
assertOwnChain(t, tester, common+fork+1)
// Synchronise with the second peer and ensure that the fork is rejected to being too old
if err := tester.sync("heavy-rewriter", nil, mode); err != errInvalidAncestor {
t.Fatalf("sync failure mismatch: have %v, want %v", err, errInvalidAncestor)
}
}
// Tests that an inactive downloader will not accept incoming block headers and
// bodies.
func TestInactiveDownloader62(t *testing.T) {
@ -909,7 +1020,7 @@ func testCancel(t *testing.T, protocol int, mode SyncMode) {
if targetBlocks >= MaxHeaderFetch {
targetBlocks = MaxHeaderFetch - 15
}
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil)
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil, false)
tester := newTester()
tester.newPeer("peer", protocol, hashes, headers, blocks, receipts)
@ -944,7 +1055,7 @@ func testMultiSynchronisation(t *testing.T, protocol int, mode SyncMode) {
// Create various peers with various parts of the chain
targetPeers := 8
targetBlocks := targetPeers*blockCacheLimit - 15
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil)
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil, false)
tester := newTester()
for i := 0; i < targetPeers; i++ {
@ -972,7 +1083,7 @@ func testMultiProtoSync(t *testing.T, protocol int, mode SyncMode) {
// Create a small enough block chain to download
targetBlocks := blockCacheLimit - 15
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil)
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil, false)
// Create peers of every type
tester := newTester()
@ -1010,7 +1121,7 @@ func testEmptyShortCircuit(t *testing.T, protocol int, mode SyncMode) {
// Create a block chain to download
targetBlocks := 2*blockCacheLimit - 15
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil)
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil, false)
tester := newTester()
tester.newPeer("peer", protocol, hashes, headers, blocks, receipts)
@ -1063,7 +1174,7 @@ func testMissingHeaderAttack(t *testing.T, protocol int, mode SyncMode) {
// Create a small enough block chain to download
targetBlocks := blockCacheLimit - 15
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil)
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil, false)
tester := newTester()
@ -1095,7 +1206,7 @@ func TestShiftedHeaderAttack64Light(t *testing.T) { testShiftedHeaderAttack(t, 6
func testShiftedHeaderAttack(t *testing.T, protocol int, mode SyncMode) {
// Create a small enough block chain to download
targetBlocks := blockCacheLimit - 15
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil)
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil, false)
tester := newTester()
@ -1126,7 +1237,7 @@ func TestInvalidHeaderRollback64Light(t *testing.T) { testInvalidHeaderRollback(
func testInvalidHeaderRollback(t *testing.T, protocol int, mode SyncMode) {
// Create a small enough block chain to download
targetBlocks := 3*fsHeaderSafetyNet + fsMinFullBlocks
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil)
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil, false)
tester := newTester()
@ -1217,7 +1328,7 @@ func testHighTDStarvationAttack(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
tester := newTester()
hashes, headers, blocks, receipts := makeChain(0, 0, genesis, nil)
hashes, headers, blocks, receipts := makeChain(0, 0, genesis, nil, false)
tester.newPeer("attack", protocol, []common.Hash{hashes[0]}, headers, blocks, receipts)
if err := tester.sync("attack", big.NewInt(1000000), mode); err != errStallingPeer {
@ -1247,6 +1358,7 @@ func testBlockHeaderAttackerDropping(t *testing.T, protocol int) {
{errEmptyHashSet, true}, // No hashes were returned as a response, drop as it's a dead end
{errEmptyHeaderSet, true}, // No headers were returned as a response, drop as it's a dead end
{errPeersUnavailable, true}, // Nobody had the advertised blocks, drop the advertiser
{errInvalidAncestor, true}, // Agreed upon ancestor is not acceptable, drop the chain rewriter
{errInvalidChain, true}, // Hash chain was detected as invalid, definitely drop
{errInvalidBlock, false}, // A bad peer was detected, but not the sync origin
{errInvalidBody, false}, // A bad peer was detected, but not the sync origin
@ -1294,7 +1406,7 @@ func testSyncProgress(t *testing.T, protocol int, mode SyncMode) {
// Create a small enough block chain to download
targetBlocks := blockCacheLimit - 15
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil)
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil, false)
// Set a sync init hook to catch progress changes
starting := make(chan struct{})
@ -1366,7 +1478,7 @@ func testForkedSyncProgress(t *testing.T, protocol int, mode SyncMode) {
// Create a forked chain to simulate origin revertal
common, fork := MaxHashFetch, 2*MaxHashFetch
hashesA, hashesB, headersA, headersB, blocksA, blocksB, receiptsA, receiptsB := makeChainFork(common+fork, fork, genesis, nil)
hashesA, hashesB, headersA, headersB, blocksA, blocksB, receiptsA, receiptsB := makeChainFork(common+fork, fork, genesis, nil, true)
// Set a sync init hook to catch progress changes
starting := make(chan struct{})
@ -1441,7 +1553,7 @@ func testFailedSyncProgress(t *testing.T, protocol int, mode SyncMode) {
// Create a small enough block chain to download
targetBlocks := blockCacheLimit - 15
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil)
hashes, headers, blocks, receipts := makeChain(targetBlocks, 0, genesis, nil, false)
// Set a sync init hook to catch progress changes
starting := make(chan struct{})
@ -1517,7 +1629,7 @@ func testFakedSyncProgress(t *testing.T, protocol int, mode SyncMode) {
// Create a small block chain
targetBlocks := blockCacheLimit - 15
hashes, headers, blocks, receipts := makeChain(targetBlocks+3, 0, genesis, nil)
hashes, headers, blocks, receipts := makeChain(targetBlocks+3, 0, genesis, nil, false)
// Set a sync init hook to catch progress changes
starting := make(chan struct{})
@ -1590,7 +1702,7 @@ func TestDeliverHeadersHang64Light(t *testing.T) { testDeliverHeadersHang(t, 64,
func testDeliverHeadersHang(t *testing.T, protocol int, mode SyncMode) {
t.Parallel()
hashes, headers, blocks, receipts := makeChain(5, 0, genesis, nil)
hashes, headers, blocks, receipts := makeChain(5, 0, genesis, nil, false)
fakeHeads := []*types.Header{{}, {}, {}, {}}
for i := 0; i < 200; i++ {
tester := newTester()