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@ -2,7 +2,10 @@ package downloader |
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import ( |
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"encoding/binary" |
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"errors" |
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"fmt" |
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"math/big" |
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"sync/atomic" |
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"testing" |
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"time" |
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@ -13,21 +16,29 @@ import ( |
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) |
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var ( |
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knownHash = common.Hash{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} |
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unknownHash = common.Hash{9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9} |
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bannedHash = common.Hash{5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5} |
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knownHash = common.Hash{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1} |
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unknownHash = common.Hash{2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2} |
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bannedHash = common.Hash{3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3} |
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genesis = createBlock(1, common.Hash{}, knownHash) |
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) |
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func createHashes(start, amount int) (hashes []common.Hash) { |
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// idCounter is used by the createHashes method the generate deterministic but unique hashes
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var idCounter = int64(2) // #1 is the genesis block
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// createHashes generates a batch of hashes rooted at a specific point in the chain.
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func createHashes(amount int, root common.Hash) (hashes []common.Hash) { |
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hashes = make([]common.Hash, amount+1) |
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hashes[len(hashes)-1] = knownHash |
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hashes[len(hashes)-1] = root |
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for i := range hashes[:len(hashes)-1] { |
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binary.BigEndian.PutUint64(hashes[i][:8], uint64(start+i+2)) |
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for i := 0; i < len(hashes)-1; i++ { |
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binary.BigEndian.PutUint64(hashes[i][:8], uint64(idCounter)) |
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idCounter++ |
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} |
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return |
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} |
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// createBlock assembles a new block at the given chain height.
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func createBlock(i int, parent, hash common.Hash) *types.Block { |
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header := &types.Header{Number: big.NewInt(int64(i))} |
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block := types.NewBlockWithHeader(header) |
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@ -36,6 +47,11 @@ func createBlock(i int, parent, hash common.Hash) *types.Block { |
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return block |
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} |
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// copyBlock makes a deep copy of a block suitable for local modifications.
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func copyBlock(block *types.Block) *types.Block { |
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return createBlock(int(block.Number().Int64()), block.ParentHeaderHash, block.HeaderHash) |
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} |
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func createBlocksFromHashes(hashes []common.Hash) map[common.Hash]*types.Block { |
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blocks := make(map[common.Hash]*types.Block) |
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for i := 0; i < len(hashes); i++ { |
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@ -51,181 +67,171 @@ func createBlocksFromHashes(hashes []common.Hash) map[common.Hash]*types.Block { |
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type downloadTester struct { |
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downloader *Downloader |
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hashes []common.Hash // Chain of hashes simulating
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blocks map[common.Hash]*types.Block // Blocks associated with the hashes
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chain []common.Hash // Block-chain being constructed
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ownHashes []common.Hash // Hash chain belonging to the tester
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ownBlocks map[common.Hash]*types.Block // Blocks belonging to the tester
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peerHashes map[string][]common.Hash // Hash chain belonging to different test peers
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peerBlocks map[string]map[common.Hash]*types.Block // Blocks belonging to different test peers
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maxHashFetch int // Overrides the maximum number of retrieved hashes
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t *testing.T |
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done chan bool |
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activePeerId string |
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} |
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func newTester(t *testing.T, hashes []common.Hash, blocks map[common.Hash]*types.Block) *downloadTester { |
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func newTester() *downloadTester { |
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tester := &downloadTester{ |
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t: t, |
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hashes: hashes, |
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blocks: blocks, |
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chain: []common.Hash{knownHash}, |
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done: make(chan bool), |
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ownHashes: []common.Hash{knownHash}, |
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ownBlocks: map[common.Hash]*types.Block{knownHash: genesis}, |
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peerHashes: make(map[string][]common.Hash), |
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peerBlocks: make(map[string]map[common.Hash]*types.Block), |
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} |
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var mux event.TypeMux |
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downloader := New(&mux, tester.hasBlock, tester.getBlock) |
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downloader := New(&mux, tester.hasBlock, tester.getBlock, tester.insertChain, tester.dropPeer) |
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tester.downloader = downloader |
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return tester |
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} |
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// sync is a simple wrapper around the downloader to start synchronisation and
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// block until it returns
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func (dl *downloadTester) sync(peerId string, head common.Hash) error { |
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dl.activePeerId = peerId |
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return dl.downloader.Synchronise(peerId, head) |
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// sync starts synchronizing with a remote peer, blocking until it completes.
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func (dl *downloadTester) sync(id string) error { |
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err := dl.downloader.synchronise(id, dl.peerHashes[id][0]) |
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for atomic.LoadInt32(&dl.downloader.processing) == 1 { |
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time.Sleep(time.Millisecond) |
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} |
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return err |
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} |
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// syncTake is starts synchronising with a remote peer, but concurrently it also
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// starts fetching blocks that the downloader retrieved. IT blocks until both go
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// routines terminate.
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func (dl *downloadTester) syncTake(peerId string, head common.Hash) ([]*Block, error) { |
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// Start a block collector to take blocks as they become available
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done := make(chan struct{}) |
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took := []*Block{} |
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go func() { |
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for running := true; running; { |
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select { |
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case <-done: |
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running = false |
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default: |
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time.Sleep(time.Millisecond) |
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// hasBlock checks if a block is pres ent in the testers canonical chain.
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func (dl *downloadTester) hasBlock(hash common.Hash) bool { |
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return dl.getBlock(hash) != nil |
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} |
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// Take a batch of blocks and accumulate
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took = append(took, dl.downloader.TakeBlocks()...) |
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// getBlock retrieves a block from the testers canonical chain.
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func (dl *downloadTester) getBlock(hash common.Hash) *types.Block { |
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return dl.ownBlocks[hash] |
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} |
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done <- struct{}{} |
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}() |
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// Start the downloading, sync the taker and return
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err := dl.sync(peerId, head) |
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done <- struct{}{} |
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<-done |
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// insertChain injects a new batch of blocks into the simulated chain.
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func (dl *downloadTester) insertChain(blocks types.Blocks) (int, error) { |
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for i, block := range blocks { |
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if _, ok := dl.ownBlocks[block.ParentHash()]; !ok { |
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return i, errors.New("unknown parent") |
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} |
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dl.ownHashes = append(dl.ownHashes, block.Hash()) |
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dl.ownBlocks[block.Hash()] = block |
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} |
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return len(blocks), nil |
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} |
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return took, err |
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// newPeer registers a new block download source into the downloader.
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func (dl *downloadTester) newPeer(id string, hashes []common.Hash, blocks map[common.Hash]*types.Block) error { |
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return dl.newSlowPeer(id, hashes, blocks, 0) |
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} |
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func (dl *downloadTester) hasBlock(hash common.Hash) bool { |
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for _, h := range dl.chain { |
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if h == hash { |
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return true |
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// newSlowPeer registers a new block download source into the downloader, with a
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// specific delay time on processing the network packets sent to it, simulating
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// potentially slow network IO.
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func (dl *downloadTester) newSlowPeer(id string, hashes []common.Hash, blocks map[common.Hash]*types.Block, delay time.Duration) error { |
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err := dl.downloader.RegisterPeer(id, hashes[0], dl.peerGetHashesFn(id, delay), dl.peerGetBlocksFn(id, delay)) |
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if err == nil { |
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// Assign the owned hashes and blocks to the peer (deep copy)
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dl.peerHashes[id] = make([]common.Hash, len(hashes)) |
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copy(dl.peerHashes[id], hashes) |
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dl.peerBlocks[id] = make(map[common.Hash]*types.Block) |
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for hash, block := range blocks { |
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dl.peerBlocks[id][hash] = copyBlock(block) |
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} |
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} |
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return false |
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return err |
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} |
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func (dl *downloadTester) getBlock(hash common.Hash) *types.Block { |
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return dl.blocks[knownHash] |
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// dropPeer simulates a hard peer removal from the connection pool.
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func (dl *downloadTester) dropPeer(id string) { |
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delete(dl.peerHashes, id) |
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delete(dl.peerBlocks, id) |
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dl.downloader.UnregisterPeer(id) |
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} |
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// getHashes retrieves a batch of hashes for reconstructing the chain.
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func (dl *downloadTester) getHashes(head common.Hash) error { |
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// peerGetBlocksFn constructs a getHashes function associated with a particular
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// peer in the download tester. The returned function can be used to retrieve
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// batches of hashes from the particularly requested peer.
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func (dl *downloadTester) peerGetHashesFn(id string, delay time.Duration) func(head common.Hash) error { |
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return func(head common.Hash) error { |
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time.Sleep(delay) |
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limit := MaxHashFetch |
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if dl.maxHashFetch > 0 { |
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limit = dl.maxHashFetch |
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} |
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// Gather the next batch of hashes
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hashes := make([]common.Hash, 0, limit) |
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for i, hash := range dl.hashes { |
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hashes := dl.peerHashes[id] |
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result := make([]common.Hash, 0, limit) |
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for i, hash := range hashes { |
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if hash == head { |
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i++ |
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for len(hashes) < cap(hashes) && i < len(dl.hashes) { |
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hashes = append(hashes, dl.hashes[i]) |
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for len(result) < cap(result) && i < len(hashes) { |
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result = append(result, hashes[i]) |
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i++ |
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} |
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break |
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} |
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} |
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// Delay delivery a bit to allow attacks to unfold
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id := dl.activePeerId |
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go func() { |
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time.Sleep(time.Millisecond) |
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dl.downloader.DeliverHashes(id, hashes) |
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dl.downloader.DeliverHashes(id, result) |
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}() |
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return nil |
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} |
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} |
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func (dl *downloadTester) getBlocks(id string) func([]common.Hash) error { |
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// peerGetBlocksFn constructs a getBlocks function associated with a particular
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// peer in the download tester. The returned function can be used to retrieve
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// batches of blocks from the particularly requested peer.
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func (dl *downloadTester) peerGetBlocksFn(id string, delay time.Duration) func([]common.Hash) error { |
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return func(hashes []common.Hash) error { |
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blocks := make([]*types.Block, 0, len(hashes)) |
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time.Sleep(delay) |
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blocks := dl.peerBlocks[id] |
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result := make([]*types.Block, 0, len(hashes)) |
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for _, hash := range hashes { |
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if block, ok := dl.blocks[hash]; ok { |
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blocks = append(blocks, block) |
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if block, ok := blocks[hash]; ok { |
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result = append(result, block) |
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} |
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} |
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go dl.downloader.DeliverBlocks(id, blocks) |
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go dl.downloader.DeliverBlocks(id, result) |
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return nil |
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} |
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} |
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// newPeer registers a new block download source into the syncer.
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func (dl *downloadTester) newPeer(id string, td *big.Int, hash common.Hash) error { |
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return dl.downloader.RegisterPeer(id, hash, dl.getHashes, dl.getBlocks(id)) |
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} |
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// Tests that simple synchronization, without throttling from a good peer works.
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func TestSynchronisation(t *testing.T) { |
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// Create a small enough block chain to download and the tester
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targetBlocks := blockCacheLimit - 15 |
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hashes := createHashes(0, targetBlocks) |
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hashes := createHashes(targetBlocks, knownHash) |
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blocks := createBlocksFromHashes(hashes) |
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tester := newTester(t, hashes, blocks) |
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tester.newPeer("peer", big.NewInt(10000), hashes[0]) |
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tester := newTester() |
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tester.newPeer("peer", hashes, blocks) |
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// Synchronise with the peer and make sure all blocks were retrieved
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if err := tester.sync("peer", hashes[0]); err != nil { |
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t.Fatalf("failed to synchronise blocks: %v", err) |
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} |
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if queued := len(tester.downloader.queue.blockPool); queued != targetBlocks { |
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t.Fatalf("synchronised block mismatch: have %v, want %v", queued, targetBlocks) |
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} |
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} |
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// Tests that the synchronized blocks can be correctly retrieved.
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func TestBlockTaking(t *testing.T) { |
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// Create a small enough block chain to download and the tester
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targetBlocks := blockCacheLimit - 15 |
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hashes := createHashes(0, targetBlocks) |
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blocks := createBlocksFromHashes(hashes) |
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tester := newTester(t, hashes, blocks) |
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tester.newPeer("peer", big.NewInt(10000), hashes[0]) |
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// Synchronise with the peer and test block retrieval
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if err := tester.sync("peer", hashes[0]); err != nil { |
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if err := tester.sync("peer"); err != nil { |
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t.Fatalf("failed to synchronise blocks: %v", err) |
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} |
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if took := tester.downloader.TakeBlocks(); len(took) != targetBlocks { |
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t.Fatalf("took block mismatch: have %v, want %v", len(took), targetBlocks) |
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if imported := len(tester.ownBlocks); imported != targetBlocks+1 { |
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t.Fatalf("synchronised block mismatch: have %v, want %v", imported, targetBlocks+1) |
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} |
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|
|
|
} |
|
|
|
|
|
|
|
|
|
// Tests that an inactive downloader will not accept incoming hashes and blocks.
|
|
|
|
|
func TestInactiveDownloader(t *testing.T) { |
|
|
|
|
// Create a small enough block chain to download and the tester
|
|
|
|
|
targetBlocks := blockCacheLimit - 15 |
|
|
|
|
hashes := createHashes(0, targetBlocks) |
|
|
|
|
blocks := createBlocksFromHashSet(createHashSet(hashes)) |
|
|
|
|
|
|
|
|
|
tester := newTester(t, nil, nil) |
|
|
|
|
tester := newTester() |
|
|
|
|
|
|
|
|
|
// Check that neither hashes nor blocks are accepted
|
|
|
|
|
if err := tester.downloader.DeliverHashes("bad peer", hashes); err != errNoSyncActive { |
|
|
|
|
if err := tester.downloader.DeliverHashes("bad peer", []common.Hash{}); err != errNoSyncActive { |
|
|
|
|
t.Errorf("error mismatch: have %v, want %v", err, errNoSyncActive) |
|
|
|
|
} |
|
|
|
|
if err := tester.downloader.DeliverBlocks("bad peer", blocks); err != errNoSyncActive { |
|
|
|
|
if err := tester.downloader.DeliverBlocks("bad peer", []*types.Block{}); err != errNoSyncActive { |
|
|
|
|
t.Errorf("error mismatch: have %v, want %v", err, errNoSyncActive) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
@ -234,27 +240,27 @@ func TestInactiveDownloader(t *testing.T) { |
|
|
|
|
func TestCancel(t *testing.T) { |
|
|
|
|
// Create a small enough block chain to download and the tester
|
|
|
|
|
targetBlocks := blockCacheLimit - 15 |
|
|
|
|
hashes := createHashes(0, targetBlocks) |
|
|
|
|
hashes := createHashes(targetBlocks, knownHash) |
|
|
|
|
blocks := createBlocksFromHashes(hashes) |
|
|
|
|
|
|
|
|
|
tester := newTester(t, hashes, blocks) |
|
|
|
|
tester.newPeer("peer", big.NewInt(10000), hashes[0]) |
|
|
|
|
tester := newTester() |
|
|
|
|
tester.newPeer("peer", hashes, blocks) |
|
|
|
|
|
|
|
|
|
// Make sure canceling works with a pristine downloader
|
|
|
|
|
tester.downloader.Cancel() |
|
|
|
|
hashCount, blockCount := tester.downloader.queue.Size() |
|
|
|
|
if hashCount > 0 || blockCount > 0 { |
|
|
|
|
t.Errorf("block or hash count mismatch: %d hashes, %d blocks, want 0", hashCount, blockCount) |
|
|
|
|
} |
|
|
|
|
// Synchronise with the peer, but cancel afterwards
|
|
|
|
|
if err := tester.sync("peer", hashes[0]); err != nil { |
|
|
|
|
if err := tester.sync("peer"); err != nil { |
|
|
|
|
t.Fatalf("failed to synchronise blocks: %v", err) |
|
|
|
|
} |
|
|
|
|
if !tester.downloader.Cancel() { |
|
|
|
|
t.Fatalf("cancel operation failed") |
|
|
|
|
} |
|
|
|
|
// Make sure the queue reports empty and no blocks can be taken
|
|
|
|
|
hashCount, blockCount := tester.downloader.queue.Size() |
|
|
|
|
tester.downloader.Cancel() |
|
|
|
|
hashCount, blockCount = tester.downloader.queue.Size() |
|
|
|
|
if hashCount > 0 || blockCount > 0 { |
|
|
|
|
t.Errorf("block or hash count mismatch: %d hashes, %d blocks, want 0", hashCount, blockCount) |
|
|
|
|
} |
|
|
|
|
if took := tester.downloader.TakeBlocks(); len(took) != 0 { |
|
|
|
|
t.Errorf("taken blocks mismatch: have %d, want %d", len(took), 0) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
// Tests that if a large batch of blocks are being downloaded, it is throttled
|
|
|
|
|
@ -262,98 +268,167 @@ func TestCancel(t *testing.T) { |
|
|
|
|
func TestThrottling(t *testing.T) { |
|
|
|
|
// Create a long block chain to download and the tester
|
|
|
|
|
targetBlocks := 8 * blockCacheLimit |
|
|
|
|
hashes := createHashes(0, targetBlocks) |
|
|
|
|
hashes := createHashes(targetBlocks, knownHash) |
|
|
|
|
blocks := createBlocksFromHashes(hashes) |
|
|
|
|
|
|
|
|
|
tester := newTester(t, hashes, blocks) |
|
|
|
|
tester.newPeer("peer", big.NewInt(10000), hashes[0]) |
|
|
|
|
tester := newTester() |
|
|
|
|
tester.newPeer("peer", hashes, blocks) |
|
|
|
|
|
|
|
|
|
// Wrap the importer to allow stepping
|
|
|
|
|
done := make(chan int) |
|
|
|
|
tester.downloader.insertChain = func(blocks types.Blocks) (int, error) { |
|
|
|
|
n, err := tester.insertChain(blocks) |
|
|
|
|
done <- n |
|
|
|
|
return n, err |
|
|
|
|
} |
|
|
|
|
// Start a synchronisation concurrently
|
|
|
|
|
errc := make(chan error) |
|
|
|
|
go func() { |
|
|
|
|
errc <- tester.sync("peer", hashes[0]) |
|
|
|
|
errc <- tester.sync("peer") |
|
|
|
|
}() |
|
|
|
|
// Iteratively take some blocks, always checking the retrieval count
|
|
|
|
|
for total := 0; total < targetBlocks; { |
|
|
|
|
// Wait a bit for sync to complete
|
|
|
|
|
for len(tester.ownBlocks) < targetBlocks+1 { |
|
|
|
|
// Wait a bit for sync to throttle itself
|
|
|
|
|
var cached int |
|
|
|
|
for start := time.Now(); time.Since(start) < 3*time.Second; { |
|
|
|
|
time.Sleep(25 * time.Millisecond) |
|
|
|
|
if len(tester.downloader.queue.blockPool) == blockCacheLimit { |
|
|
|
|
|
|
|
|
|
cached = len(tester.downloader.queue.blockPool) |
|
|
|
|
if cached == blockCacheLimit || len(tester.ownBlocks)+cached == targetBlocks+1 { |
|
|
|
|
break |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
// Fetch the next batch of blocks
|
|
|
|
|
took := tester.downloader.TakeBlocks() |
|
|
|
|
if len(took) != blockCacheLimit { |
|
|
|
|
t.Fatalf("block count mismatch: have %v, want %v", len(took), blockCacheLimit) |
|
|
|
|
// Make sure we filled up the cache, then exhaust it
|
|
|
|
|
time.Sleep(25 * time.Millisecond) // give it a chance to screw up
|
|
|
|
|
if cached != blockCacheLimit && len(tester.ownBlocks)+cached < targetBlocks+1 { |
|
|
|
|
t.Fatalf("block count mismatch: have %v, want %v", cached, blockCacheLimit) |
|
|
|
|
} |
|
|
|
|
total += len(took) |
|
|
|
|
if total > targetBlocks { |
|
|
|
|
t.Fatalf("target block count mismatch: have %v, want %v", total, targetBlocks) |
|
|
|
|
<-done // finish previous blocking import
|
|
|
|
|
for cached > maxBlockProcess { |
|
|
|
|
cached -= <-done |
|
|
|
|
} |
|
|
|
|
time.Sleep(25 * time.Millisecond) // yield to the insertion
|
|
|
|
|
} |
|
|
|
|
<-done // finish the last blocking import
|
|
|
|
|
|
|
|
|
|
// Check that we haven't pulled more blocks than available
|
|
|
|
|
if len(tester.ownBlocks) > targetBlocks+1 { |
|
|
|
|
t.Fatalf("target block count mismatch: have %v, want %v", len(tester.ownBlocks), targetBlocks+1) |
|
|
|
|
} |
|
|
|
|
if err := <-errc; err != nil { |
|
|
|
|
t.Fatalf("block synchronization failed: %v", err) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
// Tests that synchronisation from multiple peers works as intended (multi thread sanity test).
|
|
|
|
|
func TestMultiSynchronisation(t *testing.T) { |
|
|
|
|
// Create various peers with various parts of the chain
|
|
|
|
|
targetPeers := 16 |
|
|
|
|
targetBlocks := targetPeers*blockCacheLimit - 15 |
|
|
|
|
|
|
|
|
|
hashes := createHashes(targetBlocks, knownHash) |
|
|
|
|
blocks := createBlocksFromHashes(hashes) |
|
|
|
|
|
|
|
|
|
tester := newTester() |
|
|
|
|
for i := 0; i < targetPeers; i++ { |
|
|
|
|
id := fmt.Sprintf("peer #%d", i) |
|
|
|
|
tester.newPeer(id, hashes[i*blockCacheLimit:], blocks) |
|
|
|
|
} |
|
|
|
|
// Synchronise with the middle peer and make sure half of the blocks were retrieved
|
|
|
|
|
id := fmt.Sprintf("peer #%d", targetPeers/2) |
|
|
|
|
if err := tester.sync(id); err != nil { |
|
|
|
|
t.Fatalf("failed to synchronise blocks: %v", err) |
|
|
|
|
} |
|
|
|
|
if imported := len(tester.ownBlocks); imported != len(tester.peerHashes[id]) { |
|
|
|
|
t.Fatalf("synchronised block mismatch: have %v, want %v", imported, len(tester.peerHashes[id])) |
|
|
|
|
} |
|
|
|
|
// Synchronise with the best peer and make sure everything is retrieved
|
|
|
|
|
if err := tester.sync("peer #0"); err != nil { |
|
|
|
|
t.Fatalf("failed to synchronise blocks: %v", err) |
|
|
|
|
} |
|
|
|
|
if imported := len(tester.ownBlocks); imported != targetBlocks+1 { |
|
|
|
|
t.Fatalf("synchronised block mismatch: have %v, want %v", imported, targetBlocks+1) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
// Tests that synchronising with a peer who's very slow at network IO does not
|
|
|
|
|
// stall the other peers in the system.
|
|
|
|
|
func TestSlowSynchronisation(t *testing.T) { |
|
|
|
|
tester := newTester() |
|
|
|
|
|
|
|
|
|
// Create a batch of blocks, with a slow and a full speed peer
|
|
|
|
|
targetCycles := 2 |
|
|
|
|
targetBlocks := targetCycles*blockCacheLimit - 15 |
|
|
|
|
targetIODelay := 500 * time.Millisecond |
|
|
|
|
|
|
|
|
|
hashes := createHashes(targetBlocks, knownHash) |
|
|
|
|
blocks := createBlocksFromHashes(hashes) |
|
|
|
|
|
|
|
|
|
tester.newSlowPeer("fast", hashes, blocks, 0) |
|
|
|
|
tester.newSlowPeer("slow", hashes, blocks, targetIODelay) |
|
|
|
|
|
|
|
|
|
// Try to sync with the peers (pull hashes from fast)
|
|
|
|
|
start := time.Now() |
|
|
|
|
if err := tester.sync("fast"); err != nil { |
|
|
|
|
t.Fatalf("failed to synchronise blocks: %v", err) |
|
|
|
|
} |
|
|
|
|
if imported := len(tester.ownBlocks); imported != targetBlocks+1 { |
|
|
|
|
t.Fatalf("synchronised block mismatch: have %v, want %v", imported, targetBlocks+1) |
|
|
|
|
} |
|
|
|
|
// Check that the slow peer got hit at most once per block-cache-size import
|
|
|
|
|
limit := time.Duration(targetCycles+1) * targetIODelay |
|
|
|
|
if delay := time.Since(start); delay >= limit { |
|
|
|
|
t.Fatalf("synchronisation exceeded delay limit: have %v, want %v", delay, limit) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
// Tests that if a peer returns an invalid chain with a block pointing to a non-
|
|
|
|
|
// existing parent, it is correctly detected and handled.
|
|
|
|
|
func TestNonExistingParentAttack(t *testing.T) { |
|
|
|
|
tester := newTester() |
|
|
|
|
|
|
|
|
|
// Forge a single-link chain with a forged header
|
|
|
|
|
hashes := createHashes(0, 1) |
|
|
|
|
hashes := createHashes(1, knownHash) |
|
|
|
|
blocks := createBlocksFromHashes(hashes) |
|
|
|
|
tester.newPeer("valid", hashes, blocks) |
|
|
|
|
|
|
|
|
|
forged := blocks[hashes[0]] |
|
|
|
|
forged.ParentHeaderHash = unknownHash |
|
|
|
|
hashes = createHashes(1, knownHash) |
|
|
|
|
blocks = createBlocksFromHashes(hashes) |
|
|
|
|
blocks[hashes[0]].ParentHeaderHash = unknownHash |
|
|
|
|
tester.newPeer("attack", hashes, blocks) |
|
|
|
|
|
|
|
|
|
// Try and sync with the malicious node and check that it fails
|
|
|
|
|
tester := newTester(t, hashes, blocks) |
|
|
|
|
tester.newPeer("attack", big.NewInt(10000), hashes[0]) |
|
|
|
|
if err := tester.sync("attack", hashes[0]); err != nil { |
|
|
|
|
t.Fatalf("failed to synchronise blocks: %v", err) |
|
|
|
|
if err := tester.sync("attack"); err == nil { |
|
|
|
|
t.Fatalf("block synchronization succeeded") |
|
|
|
|
} |
|
|
|
|
bs := tester.downloader.TakeBlocks() |
|
|
|
|
if len(bs) != 1 { |
|
|
|
|
t.Fatalf("retrieved block mismatch: have %v, want %v", len(bs), 1) |
|
|
|
|
if tester.hasBlock(hashes[0]) { |
|
|
|
|
t.Fatalf("tester accepted unknown-parent block: %v", blocks[hashes[0]]) |
|
|
|
|
} |
|
|
|
|
if tester.hasBlock(bs[0].RawBlock.ParentHash()) { |
|
|
|
|
t.Fatalf("tester knows about the unknown hash") |
|
|
|
|
} |
|
|
|
|
tester.downloader.Cancel() |
|
|
|
|
|
|
|
|
|
// Reconstruct a valid chain, and try to synchronize with it
|
|
|
|
|
forged.ParentHeaderHash = knownHash |
|
|
|
|
tester.newPeer("valid", big.NewInt(20000), hashes[0]) |
|
|
|
|
if err := tester.sync("valid", hashes[0]); err != nil { |
|
|
|
|
// Try to synchronize with the valid chain and make sure it succeeds
|
|
|
|
|
if err := tester.sync("valid"); err != nil { |
|
|
|
|
t.Fatalf("failed to synchronise blocks: %v", err) |
|
|
|
|
} |
|
|
|
|
bs = tester.downloader.TakeBlocks() |
|
|
|
|
if len(bs) != 1 { |
|
|
|
|
t.Fatalf("retrieved block mismatch: have %v, want %v", len(bs), 1) |
|
|
|
|
} |
|
|
|
|
if !tester.hasBlock(bs[0].RawBlock.ParentHash()) { |
|
|
|
|
t.Fatalf("tester doesn't know about the origin hash") |
|
|
|
|
if !tester.hasBlock(tester.peerHashes["valid"][0]) { |
|
|
|
|
t.Fatalf("tester didn't accept known-parent block: %v", tester.peerBlocks["valid"][hashes[0]]) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
// Tests that if a malicious peers keeps sending us repeating hashes, we don't
|
|
|
|
|
// loop indefinitely.
|
|
|
|
|
func TestRepeatingHashAttack(t *testing.T) { |
|
|
|
|
func TestRepeatingHashAttack(t *testing.T) { // TODO: Is this thing valid??
|
|
|
|
|
tester := newTester() |
|
|
|
|
|
|
|
|
|
// Create a valid chain, but drop the last link
|
|
|
|
|
hashes := createHashes(0, blockCacheLimit) |
|
|
|
|
hashes := createHashes(blockCacheLimit, knownHash) |
|
|
|
|
blocks := createBlocksFromHashes(hashes) |
|
|
|
|
forged := hashes[:len(hashes)-1] |
|
|
|
|
tester.newPeer("valid", hashes, blocks) |
|
|
|
|
tester.newPeer("attack", hashes[:len(hashes)-1], blocks) |
|
|
|
|
|
|
|
|
|
// Try and sync with the malicious node
|
|
|
|
|
tester := newTester(t, forged, blocks) |
|
|
|
|
tester.newPeer("attack", big.NewInt(10000), forged[0]) |
|
|
|
|
|
|
|
|
|
errc := make(chan error) |
|
|
|
|
go func() { |
|
|
|
|
errc <- tester.sync("attack", hashes[0]) |
|
|
|
|
errc <- tester.sync("attack") |
|
|
|
|
}() |
|
|
|
|
|
|
|
|
|
// Make sure that syncing returns and does so with a failure
|
|
|
|
|
select { |
|
|
|
|
case <-time.After(time.Second): |
|
|
|
|
@ -364,9 +439,7 @@ func TestRepeatingHashAttack(t *testing.T) { |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
// Ensure that a valid chain can still pass sync
|
|
|
|
|
tester.hashes = hashes |
|
|
|
|
tester.newPeer("valid", big.NewInt(20000), hashes[0]) |
|
|
|
|
if err := tester.sync("valid", hashes[0]); err != nil { |
|
|
|
|
if err := tester.sync("valid"); err != nil { |
|
|
|
|
t.Fatalf("failed to synchronise blocks: %v", err) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
@ -374,23 +447,22 @@ func TestRepeatingHashAttack(t *testing.T) { |
|
|
|
|
// Tests that if a malicious peers returns a non-existent block hash, it should
|
|
|
|
|
// eventually time out and the sync reattempted.
|
|
|
|
|
func TestNonExistingBlockAttack(t *testing.T) { |
|
|
|
|
tester := newTester() |
|
|
|
|
|
|
|
|
|
// Create a valid chain, but forge the last link
|
|
|
|
|
hashes := createHashes(0, blockCacheLimit) |
|
|
|
|
hashes := createHashes(blockCacheLimit, knownHash) |
|
|
|
|
blocks := createBlocksFromHashes(hashes) |
|
|
|
|
origin := hashes[len(hashes)/2] |
|
|
|
|
tester.newPeer("valid", hashes, blocks) |
|
|
|
|
|
|
|
|
|
hashes[len(hashes)/2] = unknownHash |
|
|
|
|
tester.newPeer("attack", hashes, blocks) |
|
|
|
|
|
|
|
|
|
// Try and sync with the malicious node and check that it fails
|
|
|
|
|
tester := newTester(t, hashes, blocks) |
|
|
|
|
tester.newPeer("attack", big.NewInt(10000), hashes[0]) |
|
|
|
|
if err := tester.sync("attack", hashes[0]); err != errPeersUnavailable { |
|
|
|
|
if err := tester.sync("attack"); err != errPeersUnavailable { |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errPeersUnavailable) |
|
|
|
|
} |
|
|
|
|
// Ensure that a valid chain can still pass sync
|
|
|
|
|
hashes[len(hashes)/2] = origin |
|
|
|
|
tester.newPeer("valid", big.NewInt(20000), hashes[0]) |
|
|
|
|
if err := tester.sync("valid", hashes[0]); err != nil { |
|
|
|
|
if err := tester.sync("valid"); err != nil { |
|
|
|
|
t.Fatalf("failed to synchronise blocks: %v", err) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
@ -398,30 +470,28 @@ func TestNonExistingBlockAttack(t *testing.T) { |
|
|
|
|
// Tests that if a malicious peer is returning hashes in a weird order, that the
|
|
|
|
|
// sync throttler doesn't choke on them waiting for the valid blocks.
|
|
|
|
|
func TestInvalidHashOrderAttack(t *testing.T) { |
|
|
|
|
tester := newTester() |
|
|
|
|
|
|
|
|
|
// Create a valid long chain, but reverse some hashes within
|
|
|
|
|
hashes := createHashes(0, 4*blockCacheLimit) |
|
|
|
|
hashes := createHashes(4*blockCacheLimit, knownHash) |
|
|
|
|
blocks := createBlocksFromHashes(hashes) |
|
|
|
|
tester.newPeer("valid", hashes, blocks) |
|
|
|
|
|
|
|
|
|
chunk1 := make([]common.Hash, blockCacheLimit) |
|
|
|
|
chunk2 := make([]common.Hash, blockCacheLimit) |
|
|
|
|
copy(chunk1, hashes[blockCacheLimit:2*blockCacheLimit]) |
|
|
|
|
copy(chunk2, hashes[2*blockCacheLimit:3*blockCacheLimit]) |
|
|
|
|
|
|
|
|
|
reverse := make([]common.Hash, len(hashes)) |
|
|
|
|
copy(reverse, hashes) |
|
|
|
|
copy(reverse[2*blockCacheLimit:], chunk1) |
|
|
|
|
copy(reverse[blockCacheLimit:], chunk2) |
|
|
|
|
copy(hashes[2*blockCacheLimit:], chunk1) |
|
|
|
|
copy(hashes[blockCacheLimit:], chunk2) |
|
|
|
|
tester.newPeer("attack", hashes, blocks) |
|
|
|
|
|
|
|
|
|
// Try and sync with the malicious node and check that it fails
|
|
|
|
|
tester := newTester(t, reverse, blocks) |
|
|
|
|
tester.newPeer("attack", big.NewInt(10000), reverse[0]) |
|
|
|
|
if _, err := tester.syncTake("attack", reverse[0]); err != ErrInvalidChain { |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, ErrInvalidChain) |
|
|
|
|
if err := tester.sync("attack"); err != errInvalidChain { |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errInvalidChain) |
|
|
|
|
} |
|
|
|
|
// Ensure that a valid chain can still pass sync
|
|
|
|
|
tester.hashes = hashes |
|
|
|
|
tester.newPeer("valid", big.NewInt(20000), hashes[0]) |
|
|
|
|
if _, err := tester.syncTake("valid", hashes[0]); err != nil { |
|
|
|
|
if err := tester.sync("valid"); err != nil { |
|
|
|
|
t.Fatalf("failed to synchronise blocks: %v", err) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
@ -429,17 +499,24 @@ func TestInvalidHashOrderAttack(t *testing.T) { |
|
|
|
|
// Tests that if a malicious peer makes up a random hash chain and tries to push
|
|
|
|
|
// indefinitely, it actually gets caught with it.
|
|
|
|
|
func TestMadeupHashChainAttack(t *testing.T) { |
|
|
|
|
tester := newTester() |
|
|
|
|
blockSoftTTL = 100 * time.Millisecond |
|
|
|
|
crossCheckCycle = 25 * time.Millisecond |
|
|
|
|
|
|
|
|
|
// Create a long chain of hashes without backing blocks
|
|
|
|
|
hashes := createHashes(0, 1024*blockCacheLimit) |
|
|
|
|
hashes := createHashes(4*blockCacheLimit, knownHash) |
|
|
|
|
blocks := createBlocksFromHashes(hashes) |
|
|
|
|
|
|
|
|
|
tester.newPeer("valid", hashes, blocks) |
|
|
|
|
tester.newPeer("attack", createHashes(1024*blockCacheLimit, knownHash), nil) |
|
|
|
|
|
|
|
|
|
// Try and sync with the malicious node and check that it fails
|
|
|
|
|
tester := newTester(t, hashes, nil) |
|
|
|
|
tester.newPeer("attack", big.NewInt(10000), hashes[0]) |
|
|
|
|
if _, err := tester.syncTake("attack", hashes[0]); err != ErrCrossCheckFailed { |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, ErrCrossCheckFailed) |
|
|
|
|
if err := tester.sync("attack"); err != errCrossCheckFailed { |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errCrossCheckFailed) |
|
|
|
|
} |
|
|
|
|
// Ensure that a valid chain can still pass sync
|
|
|
|
|
if err := tester.sync("valid"); err != nil { |
|
|
|
|
t.Fatalf("failed to synchronise blocks: %v", err) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
@ -449,14 +526,14 @@ func TestMadeupHashChainAttack(t *testing.T) { |
|
|
|
|
// one by one prevents reliable block/parent verification.
|
|
|
|
|
func TestMadeupHashChainDrippingAttack(t *testing.T) { |
|
|
|
|
// Create a random chain of hashes to drip
|
|
|
|
|
hashes := createHashes(0, 16*blockCacheLimit) |
|
|
|
|
tester := newTester(t, hashes, nil) |
|
|
|
|
hashes := createHashes(16*blockCacheLimit, knownHash) |
|
|
|
|
tester := newTester() |
|
|
|
|
|
|
|
|
|
// Try and sync with the attacker, one hash at a time
|
|
|
|
|
tester.maxHashFetch = 1 |
|
|
|
|
tester.newPeer("attack", big.NewInt(10000), hashes[0]) |
|
|
|
|
if _, err := tester.syncTake("attack", hashes[0]); err != ErrStallingPeer { |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, ErrStallingPeer) |
|
|
|
|
tester.newPeer("attack", hashes, nil) |
|
|
|
|
if err := tester.sync("attack"); err != errStallingPeer { |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errStallingPeer) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
@ -470,7 +547,7 @@ func TestMadeupBlockChainAttack(t *testing.T) { |
|
|
|
|
crossCheckCycle = 25 * time.Millisecond |
|
|
|
|
|
|
|
|
|
// Create a long chain of blocks and simulate an invalid chain by dropping every second
|
|
|
|
|
hashes := createHashes(0, 16*blockCacheLimit) |
|
|
|
|
hashes := createHashes(16*blockCacheLimit, knownHash) |
|
|
|
|
blocks := createBlocksFromHashes(hashes) |
|
|
|
|
|
|
|
|
|
gapped := make([]common.Hash, len(hashes)/2) |
|
|
|
|
@ -478,18 +555,17 @@ func TestMadeupBlockChainAttack(t *testing.T) { |
|
|
|
|
gapped[i] = hashes[2*i] |
|
|
|
|
} |
|
|
|
|
// Try and sync with the malicious node and check that it fails
|
|
|
|
|
tester := newTester(t, gapped, blocks) |
|
|
|
|
tester.newPeer("attack", big.NewInt(10000), gapped[0]) |
|
|
|
|
if _, err := tester.syncTake("attack", gapped[0]); err != ErrCrossCheckFailed { |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, ErrCrossCheckFailed) |
|
|
|
|
tester := newTester() |
|
|
|
|
tester.newPeer("attack", gapped, blocks) |
|
|
|
|
if err := tester.sync("attack"); err != errCrossCheckFailed { |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errCrossCheckFailed) |
|
|
|
|
} |
|
|
|
|
// Ensure that a valid chain can still pass sync
|
|
|
|
|
blockSoftTTL = defaultBlockTTL |
|
|
|
|
crossCheckCycle = defaultCrossCheckCycle |
|
|
|
|
|
|
|
|
|
tester.hashes = hashes |
|
|
|
|
tester.newPeer("valid", big.NewInt(20000), hashes[0]) |
|
|
|
|
if _, err := tester.syncTake("valid", hashes[0]); err != nil { |
|
|
|
|
tester.newPeer("valid", hashes, blocks) |
|
|
|
|
if err := tester.sync("valid"); err != nil { |
|
|
|
|
t.Fatalf("failed to synchronise blocks: %v", err) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
@ -498,6 +574,8 @@ func TestMadeupBlockChainAttack(t *testing.T) { |
|
|
|
|
// attacker make up a valid hashes for random blocks, but also forges the block
|
|
|
|
|
// parents to point to existing hashes.
|
|
|
|
|
func TestMadeupParentBlockChainAttack(t *testing.T) { |
|
|
|
|
tester := newTester() |
|
|
|
|
|
|
|
|
|
defaultBlockTTL := blockSoftTTL |
|
|
|
|
defaultCrossCheckCycle := crossCheckCycle |
|
|
|
|
|
|
|
|
|
@ -505,25 +583,24 @@ func TestMadeupParentBlockChainAttack(t *testing.T) { |
|
|
|
|
crossCheckCycle = 25 * time.Millisecond |
|
|
|
|
|
|
|
|
|
// Create a long chain of blocks and simulate an invalid chain by dropping every second
|
|
|
|
|
hashes := createHashes(0, 16*blockCacheLimit) |
|
|
|
|
hashes := createHashes(16*blockCacheLimit, knownHash) |
|
|
|
|
blocks := createBlocksFromHashes(hashes) |
|
|
|
|
forges := createBlocksFromHashes(hashes) |
|
|
|
|
for hash, block := range forges { |
|
|
|
|
block.ParentHeaderHash = hash // Simulate pointing to already known hash
|
|
|
|
|
tester.newPeer("valid", hashes, blocks) |
|
|
|
|
|
|
|
|
|
for _, block := range blocks { |
|
|
|
|
block.ParentHeaderHash = knownHash // Simulate pointing to already known hash
|
|
|
|
|
} |
|
|
|
|
tester.newPeer("attack", hashes, blocks) |
|
|
|
|
|
|
|
|
|
// Try and sync with the malicious node and check that it fails
|
|
|
|
|
tester := newTester(t, hashes, forges) |
|
|
|
|
tester.newPeer("attack", big.NewInt(10000), hashes[0]) |
|
|
|
|
if _, err := tester.syncTake("attack", hashes[0]); err != ErrCrossCheckFailed { |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, ErrCrossCheckFailed) |
|
|
|
|
if err := tester.sync("attack"); err != errCrossCheckFailed { |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errCrossCheckFailed) |
|
|
|
|
} |
|
|
|
|
// Ensure that a valid chain can still pass sync
|
|
|
|
|
blockSoftTTL = defaultBlockTTL |
|
|
|
|
crossCheckCycle = defaultCrossCheckCycle |
|
|
|
|
|
|
|
|
|
tester.blocks = blocks |
|
|
|
|
tester.newPeer("valid", big.NewInt(20000), hashes[0]) |
|
|
|
|
if _, err := tester.syncTake("valid", hashes[0]); err != nil { |
|
|
|
|
if err := tester.sync("valid"); err != nil { |
|
|
|
|
t.Fatalf("failed to synchronise blocks: %v", err) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
@ -532,68 +609,81 @@ func TestMadeupParentBlockChainAttack(t *testing.T) { |
|
|
|
|
// the downloader, it will not keep refetching the same chain indefinitely, but
|
|
|
|
|
// gradually block pieces of it, until it's head is also blocked.
|
|
|
|
|
func TestBannedChainStarvationAttack(t *testing.T) { |
|
|
|
|
// Construct a valid chain, but ban one of the hashes in it
|
|
|
|
|
hashes := createHashes(0, 8*blockCacheLimit) |
|
|
|
|
hashes[len(hashes)/2+23] = bannedHash // weird index to have non multiple of ban chunk size
|
|
|
|
|
// Create the tester and ban the selected hash
|
|
|
|
|
tester := newTester() |
|
|
|
|
tester.downloader.banned.Add(bannedHash) |
|
|
|
|
|
|
|
|
|
// Construct a valid chain, for it and ban the fork
|
|
|
|
|
hashes := createHashes(8*blockCacheLimit, knownHash) |
|
|
|
|
blocks := createBlocksFromHashes(hashes) |
|
|
|
|
tester.newPeer("valid", hashes, blocks) |
|
|
|
|
|
|
|
|
|
// Create the tester and ban the selected hash
|
|
|
|
|
tester := newTester(t, hashes, blocks) |
|
|
|
|
tester.downloader.banned.Add(bannedHash) |
|
|
|
|
fork := len(hashes)/2 - 23 |
|
|
|
|
hashes = append(createHashes(4*blockCacheLimit, bannedHash), hashes[fork:]...) |
|
|
|
|
blocks = createBlocksFromHashes(hashes) |
|
|
|
|
tester.newPeer("attack", hashes, blocks) |
|
|
|
|
|
|
|
|
|
// Iteratively try to sync, and verify that the banned hash list grows until
|
|
|
|
|
// the head of the invalid chain is blocked too.
|
|
|
|
|
tester.newPeer("attack", big.NewInt(10000), hashes[0]) |
|
|
|
|
for banned := tester.downloader.banned.Size(); ; { |
|
|
|
|
// Try to sync with the attacker, check hash chain failure
|
|
|
|
|
if _, err := tester.syncTake("attack", hashes[0]); err != ErrInvalidChain { |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, ErrInvalidChain) |
|
|
|
|
if err := tester.sync("attack"); err != errInvalidChain { |
|
|
|
|
if tester.downloader.banned.Has(hashes[0]) && err == errBannedHead { |
|
|
|
|
break |
|
|
|
|
} |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errInvalidChain) |
|
|
|
|
} |
|
|
|
|
// Check that the ban list grew with at least 1 new item, or all banned
|
|
|
|
|
bans := tester.downloader.banned.Size() |
|
|
|
|
if bans < banned+1 { |
|
|
|
|
if tester.downloader.banned.Has(hashes[0]) { |
|
|
|
|
break |
|
|
|
|
} |
|
|
|
|
t.Fatalf("ban count mismatch: have %v, want %v+", bans, banned+1) |
|
|
|
|
} |
|
|
|
|
banned = bans |
|
|
|
|
} |
|
|
|
|
// Check that after banning an entire chain, bad peers get dropped
|
|
|
|
|
if err := tester.newPeer("new attacker", big.NewInt(10000), hashes[0]); err != errBannedHead { |
|
|
|
|
if err := tester.newPeer("new attacker", hashes, blocks); err != errBannedHead { |
|
|
|
|
t.Fatalf("peer registration mismatch: have %v, want %v", err, errBannedHead) |
|
|
|
|
} |
|
|
|
|
if peer := tester.downloader.peers.Peer("net attacker"); peer != nil { |
|
|
|
|
if peer := tester.downloader.peers.Peer("new attacker"); peer != nil { |
|
|
|
|
t.Fatalf("banned attacker registered: %v", peer) |
|
|
|
|
} |
|
|
|
|
// Ensure that a valid chain can still pass sync
|
|
|
|
|
if err := tester.sync("valid"); err != nil { |
|
|
|
|
t.Fatalf("failed to synchronise blocks: %v", err) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
// Tests that if a peer sends excessively many/large invalid chains that are
|
|
|
|
|
// gradually banned, it will have an upper limit on the consumed memory and also
|
|
|
|
|
// the origin bad hashes will not be evacuated.
|
|
|
|
|
func TestBannedChainMemoryExhaustionAttack(t *testing.T) { |
|
|
|
|
// Create the tester and ban the selected hash
|
|
|
|
|
tester := newTester() |
|
|
|
|
tester.downloader.banned.Add(bannedHash) |
|
|
|
|
|
|
|
|
|
// Reduce the test size a bit
|
|
|
|
|
defaultMaxBlockFetch := MaxBlockFetch |
|
|
|
|
defaultMaxBannedHashes := maxBannedHashes |
|
|
|
|
|
|
|
|
|
MaxBlockFetch = 4 |
|
|
|
|
maxBannedHashes = 256 |
|
|
|
|
|
|
|
|
|
// Construct a banned chain with more chunks than the ban limit
|
|
|
|
|
hashes := createHashes(0, maxBannedHashes*MaxBlockFetch) |
|
|
|
|
hashes[len(hashes)-1] = bannedHash // weird index to have non multiple of ban chunk size
|
|
|
|
|
|
|
|
|
|
hashes := createHashes(8*blockCacheLimit, knownHash) |
|
|
|
|
blocks := createBlocksFromHashes(hashes) |
|
|
|
|
tester.newPeer("valid", hashes, blocks) |
|
|
|
|
|
|
|
|
|
// Create the tester and ban the selected hash
|
|
|
|
|
tester := newTester(t, hashes, blocks) |
|
|
|
|
tester.downloader.banned.Add(bannedHash) |
|
|
|
|
fork := len(hashes)/2 - 23 |
|
|
|
|
hashes = append(createHashes(maxBannedHashes*MaxBlockFetch, bannedHash), hashes[fork:]...) |
|
|
|
|
blocks = createBlocksFromHashes(hashes) |
|
|
|
|
tester.newPeer("attack", hashes, blocks) |
|
|
|
|
|
|
|
|
|
// Iteratively try to sync, and verify that the banned hash list grows until
|
|
|
|
|
// the head of the invalid chain is blocked too.
|
|
|
|
|
tester.newPeer("attack", big.NewInt(10000), hashes[0]) |
|
|
|
|
for { |
|
|
|
|
// Try to sync with the attacker, check hash chain failure
|
|
|
|
|
if _, err := tester.syncTake("attack", hashes[0]); err != ErrInvalidChain { |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, ErrInvalidChain) |
|
|
|
|
if err := tester.sync("attack"); err != errInvalidChain { |
|
|
|
|
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errInvalidChain) |
|
|
|
|
} |
|
|
|
|
// Short circuit if the entire chain was banned
|
|
|
|
|
if tester.downloader.banned.Has(hashes[0]) { |
|
|
|
|
@ -609,4 +699,91 @@ func TestBannedChainMemoryExhaustionAttack(t *testing.T) { |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
// Ensure that a valid chain can still pass sync
|
|
|
|
|
MaxBlockFetch = defaultMaxBlockFetch |
|
|
|
|
maxBannedHashes = defaultMaxBannedHashes |
|
|
|
|
|
|
|
|
|
if err := tester.sync("valid"); err != nil { |
|
|
|
|
t.Fatalf("failed to synchronise blocks: %v", err) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
// Tests that misbehaving peers are disconnected, whilst behaving ones are not.
|
|
|
|
|
func TestHashAttackerDropping(t *testing.T) { |
|
|
|
|
// Define the disconnection requirement for individual hash fetch errors
|
|
|
|
|
tests := []struct { |
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result error |
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drop bool |
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}{ |
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{nil, false}, // Sync succeeded, all is well
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{errBusy, false}, // Sync is already in progress, no problem
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{errUnknownPeer, false}, // Peer is unknown, was already dropped, don't double drop
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{errBadPeer, true}, // Peer was deemed bad for some reason, drop it
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{errStallingPeer, true}, // Peer was detected to be stalling, drop it
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{errBannedHead, true}, // Peer's head hash is a known bad hash, drop it
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{errNoPeers, false}, // No peers to download from, soft race, no issue
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{errPendingQueue, false}, // There are blocks still cached, wait to exhaust, no issue
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{errTimeout, true}, // No hashes received in due time, drop the peer
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{errEmptyHashSet, true}, // No hashes were returned as a response, drop as it's a dead end
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{errPeersUnavailable, true}, // Nobody had the advertised blocks, drop the advertiser
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{errInvalidChain, true}, // Hash chain was detected as invalid, definitely drop
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{errCrossCheckFailed, true}, // Hash-origin failed to pass a block cross check, drop
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{errCancelHashFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
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{errCancelBlockFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
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{errCancelChainImport, false}, // Synchronisation was canceled, origin may be innocent, don't drop
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} |
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// Run the tests and check disconnection status
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tester := newTester() |
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for i, tt := range tests { |
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// Register a new peer and ensure it's presence
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id := fmt.Sprintf("test %d", i) |
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if err := tester.newPeer(id, []common.Hash{knownHash}, nil); err != nil { |
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t.Fatalf("test %d: failed to register new peer: %v", i, err) |
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} |
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if _, ok := tester.peerHashes[id]; !ok { |
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t.Fatalf("test %d: registered peer not found", i) |
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} |
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// Simulate a synchronisation and check the required result
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tester.downloader.synchroniseMock = func(string, common.Hash) error { return tt.result } |
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tester.downloader.Synchronise(id, knownHash) |
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if _, ok := tester.peerHashes[id]; !ok != tt.drop { |
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t.Errorf("test %d: peer drop mismatch for %v: have %v, want %v", i, tt.result, !ok, tt.drop) |
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} |
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} |
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} |
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// Tests that feeding bad blocks will result in a peer drop.
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func TestBlockAttackerDropping(t *testing.T) { |
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// Define the disconnection requirement for individual block import errors
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|
tests := []struct { |
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|
|
failure bool |
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|
drop bool |
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|
|
}{{true, true}, {false, false}} |
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// Run the tests and check disconnection status
|
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|
|
tester := newTester() |
|
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|
for i, tt := range tests { |
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|
|
// Register a new peer and ensure it's presence
|
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|
|
|
id := fmt.Sprintf("test %d", i) |
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|
if err := tester.newPeer(id, []common.Hash{common.Hash{}}, nil); err != nil { |
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|
t.Fatalf("test %d: failed to register new peer: %v", i, err) |
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|
} |
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|
if _, ok := tester.peerHashes[id]; !ok { |
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|
t.Fatalf("test %d: registered peer not found", i) |
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|
} |
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|
// Assemble a good or bad block, depending of the test
|
|
|
|
|
raw := createBlock(1, knownHash, common.Hash{}) |
|
|
|
|
if tt.failure { |
|
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|
|
raw = createBlock(1, unknownHash, common.Hash{}) |
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|
} |
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|
block := &Block{OriginPeer: id, RawBlock: raw} |
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|
// Simulate block processing and check the result
|
|
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|
|
tester.downloader.queue.blockCache[0] = block |
|
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|
|
tester.downloader.process() |
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|
|
|
if _, ok := tester.peerHashes[id]; !ok != tt.drop { |
|
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|
|
t.Errorf("test %d: peer drop mismatch for %v: have %v, want %v", i, tt.failure, !ok, tt.drop) |
|
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|
} |
|
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|
} |
|
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|
} |
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Jeffrey Wilcke
10 years ago