From 45c7ddd109465e03551f5b39c2e650c243b4a078 Mon Sep 17 00:00:00 2001
From: Suhas Daftuar <sdaftuar@gmail.com>
Date: Tue, 12 Jul 2016 16:05:02 -0400
Subject: [PATCH] Add p2p test for BIP 152 (compact blocks)

---
 qa/pull-tester/rpc-tests.py       |   1 +
 qa/rpc-tests/p2p-compactblocks.py | 608 ++++++++++++++++++++++++++++++
 2 files changed, 609 insertions(+)
 create mode 100755 qa/rpc-tests/p2p-compactblocks.py

diff --git a/qa/pull-tester/rpc-tests.py b/qa/pull-tester/rpc-tests.py
index 11b83bac14..c4b11bc51b 100755
--- a/qa/pull-tester/rpc-tests.py
+++ b/qa/pull-tester/rpc-tests.py
@@ -141,6 +141,7 @@ testScripts = [
     'segwit.py',
     'importprunedfunds.py',
     'signmessages.py',
+    'p2p-compactblocks.py',
 ]
 if ENABLE_ZMQ:
     testScripts.append('zmq_test.py')
diff --git a/qa/rpc-tests/p2p-compactblocks.py b/qa/rpc-tests/p2p-compactblocks.py
new file mode 100755
index 0000000000..7fe7ecc16c
--- /dev/null
+++ b/qa/rpc-tests/p2p-compactblocks.py
@@ -0,0 +1,608 @@
+#!/usr/bin/env python3
+# Copyright (c) 2016 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+from test_framework.mininode import *
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import *
+from test_framework.blocktools import create_block, create_coinbase
+from test_framework.siphash import siphash256
+from test_framework.script import CScript, OP_TRUE
+
+'''
+CompactBlocksTest -- test compact blocks (BIP 152)
+'''
+
+
+# TestNode: A peer we use to send messages to bitcoind, and store responses.
+class TestNode(SingleNodeConnCB):
+    def __init__(self):
+        SingleNodeConnCB.__init__(self)
+        self.last_sendcmpct = None
+        self.last_headers = None
+        self.last_inv = None
+        self.last_cmpctblock = None
+        self.block_announced = False
+        self.last_getdata = None
+        self.last_getblocktxn = None
+        self.last_block = None
+        self.last_blocktxn = None
+
+    def on_sendcmpct(self, conn, message):
+        self.last_sendcmpct = message
+
+    def on_block(self, conn, message):
+        self.last_block = message
+
+    def on_cmpctblock(self, conn, message):
+        self.last_cmpctblock = message
+        self.block_announced = True
+
+    def on_headers(self, conn, message):
+        self.last_headers = message
+        self.block_announced = True
+
+    def on_inv(self, conn, message):
+        self.last_inv = message
+        self.block_announced = True
+
+    def on_getdata(self, conn, message):
+        self.last_getdata = message
+
+    def on_getblocktxn(self, conn, message):
+        self.last_getblocktxn = message
+
+    def on_blocktxn(self, conn, message):
+        self.last_blocktxn = message
+
+    # Requires caller to hold mininode_lock
+    def received_block_announcement(self):
+        return self.block_announced
+
+    def clear_block_announcement(self):
+        with mininode_lock:
+            self.block_announced = False
+            self.last_inv = None
+            self.last_headers = None
+            self.last_cmpctblock = None
+
+    def get_headers(self, locator, hashstop):
+        msg = msg_getheaders()
+        msg.locator.vHave = locator
+        msg.hashstop = hashstop
+        self.connection.send_message(msg)
+
+    def send_header_for_blocks(self, new_blocks):
+        headers_message = msg_headers()
+        headers_message.headers = [CBlockHeader(b) for b in new_blocks]
+        self.send_message(headers_message)
+
+
+class CompactBlocksTest(BitcoinTestFramework):
+    def __init__(self):
+        super().__init__()
+        self.setup_clean_chain = True
+        self.num_nodes = 1
+        self.utxos = []
+
+    def setup_network(self):
+        self.nodes = []
+
+        # Turn off segwit in this test, as compact blocks don't currently work
+        # with segwit.  (After BIP 152 is updated to support segwit, we can
+        # test behavior with and without segwit enabled by adding a second node
+        # to the test.)
+        self.nodes = start_nodes(self.num_nodes, self.options.tmpdir, [["-debug", "-logtimemicros=1", "-bip9params=segwit:0:0"]])
+
+    def build_block_on_tip(self):
+        height = self.nodes[0].getblockcount()
+        tip = self.nodes[0].getbestblockhash()
+        mtp = self.nodes[0].getblockheader(tip)['mediantime']
+        block = create_block(int(tip, 16), create_coinbase(height + 1), mtp + 1)
+        block.solve()
+        return block
+
+    # Create 10 more anyone-can-spend utxo's for testing.
+    def make_utxos(self):
+        block = self.build_block_on_tip()
+        self.test_node.send_and_ping(msg_block(block))
+        assert(int(self.nodes[0].getbestblockhash(), 16) == block.sha256)
+        self.nodes[0].generate(100)
+
+        total_value = block.vtx[0].vout[0].nValue
+        out_value = total_value // 10
+        tx = CTransaction()
+        tx.vin.append(CTxIn(COutPoint(block.vtx[0].sha256, 0), b''))
+        for i in range(10):
+            tx.vout.append(CTxOut(out_value, CScript([OP_TRUE])))
+        tx.rehash()
+
+        block2 = self.build_block_on_tip()
+        block2.vtx.append(tx)
+        block2.hashMerkleRoot = block2.calc_merkle_root()
+        block2.solve()
+        self.test_node.send_and_ping(msg_block(block2))
+        assert_equal(int(self.nodes[0].getbestblockhash(), 16), block2.sha256)
+        self.utxos.extend([[tx.sha256, i, out_value] for i in range(10)])
+        return
+
+    # Test "sendcmpct":
+    # - No compact block announcements or getdata(MSG_CMPCT_BLOCK) unless
+    #   sendcmpct is sent.
+    # - If sendcmpct is sent with version > 0, the message is ignored.
+    # - If sendcmpct is sent with boolean 0, then block announcements are not
+    #   made with compact blocks.
+    # - If sendcmpct is then sent with boolean 1, then new block announcements
+    #   are made with compact blocks.
+    def test_sendcmpct(self):
+        print("Testing SENDCMPCT p2p message... ")
+
+        # Make sure we get a version 0 SENDCMPCT message from our peer
+        def received_sendcmpct():
+            return (self.test_node.last_sendcmpct is not None)
+        got_message = wait_until(received_sendcmpct, timeout=30)
+        assert(got_message)
+        assert_equal(self.test_node.last_sendcmpct.version, 1)
+
+        tip = int(self.nodes[0].getbestblockhash(), 16)
+
+        def check_announcement_of_new_block(node, peer, predicate):
+            self.test_node.clear_block_announcement()
+            node.generate(1)
+            got_message = wait_until(peer.received_block_announcement, timeout=30)
+            assert(got_message)
+            with mininode_lock:
+                assert(predicate)
+
+        # We shouldn't get any block announcements via cmpctblock yet.
+        check_announcement_of_new_block(self.nodes[0], self.test_node, lambda: self.test_node.last_cmpctblock is None)
+
+        # Try one more time, this time after requesting headers.
+        self.test_node.clear_block_announcement()
+        self.test_node.get_headers(locator=[tip], hashstop=0)
+        wait_until(self.test_node.received_block_announcement, timeout=30)
+        self.test_node.clear_block_announcement()
+
+        check_announcement_of_new_block(self.nodes[0], self.test_node, lambda: self.test_node.last_cmpctblock is None and self.test_node.last_inv is not None)
+
+        # Now try a SENDCMPCT message with too-high version
+        sendcmpct = msg_sendcmpct()
+        sendcmpct.version = 2
+        self.test_node.send_message(sendcmpct)
+
+        check_announcement_of_new_block(self.nodes[0], self.test_node, lambda: self.test_node.last_cmpctblock is None)
+
+        # Now try a SENDCMPCT message with valid version, but announce=False
+        self.test_node.send_message(msg_sendcmpct())
+        check_announcement_of_new_block(self.nodes[0], self.test_node, lambda: self.test_node.last_cmpctblock is None)
+
+        # Finally, try a SENDCMPCT message with announce=True
+        sendcmpct.version = 1
+        sendcmpct.announce = True
+        self.test_node.send_message(sendcmpct)
+        check_announcement_of_new_block(self.nodes[0], self.test_node, lambda: self.test_node.last_cmpctblock is not None)
+
+        # Try one more time
+        check_announcement_of_new_block(self.nodes[0], self.test_node, lambda: self.test_node.last_cmpctblock is not None)
+
+        # Try one more time, after turning on sendheaders
+        self.test_node.send_message(msg_sendheaders())
+        check_announcement_of_new_block(self.nodes[0], self.test_node, lambda: self.test_node.last_cmpctblock is not None)
+
+        # Now turn off announcements
+        sendcmpct.announce = False
+        check_announcement_of_new_block(self.nodes[0], self.test_node, lambda: self.test_node.last_cmpctblock is None and self.test_node.last_headers is not None)
+
+    # This test actually causes bitcoind to (reasonably!) disconnect us, so do this last.
+    def test_invalid_cmpctblock_message(self):
+        print("Testing invalid index in cmpctblock message...")
+        self.nodes[0].generate(101)
+        block = self.build_block_on_tip()
+
+        cmpct_block = P2PHeaderAndShortIDs()
+        cmpct_block.header = CBlockHeader(block)
+        cmpct_block.prefilled_txn_length = 1
+        # This index will be too high
+        prefilled_txn = PrefilledTransaction(1, block.vtx[0])
+        cmpct_block.prefilled_txn = [prefilled_txn]
+        self.test_node.send_and_ping(msg_cmpctblock(cmpct_block))
+        assert(int(self.nodes[0].getbestblockhash(), 16) == block.hashPrevBlock)
+
+    # Compare the generated shortids to what we expect based on BIP 152, given
+    # bitcoind's choice of nonce.
+    def test_compactblock_construction(self):
+        print("Testing compactblock headers and shortIDs are correct...")
+
+        # Generate a bunch of transactions.
+        self.nodes[0].generate(101)
+        num_transactions = 25
+        address = self.nodes[0].getnewaddress()
+        for i in range(num_transactions):
+            self.nodes[0].sendtoaddress(address, 0.1)
+
+        # Now mine a block, and look at the resulting compact block.
+        self.test_node.clear_block_announcement()
+        block_hash = int(self.nodes[0].generate(1)[0], 16)
+
+        # Store the raw block in our internal format.
+        block = FromHex(CBlock(), self.nodes[0].getblock("%02x" % block_hash, False))
+        [tx.calc_sha256() for tx in block.vtx]
+        block.rehash()
+
+        # Don't care which type of announcement came back for this test; just
+        # request the compact block if we didn't get one yet.
+        wait_until(self.test_node.received_block_announcement, timeout=30)
+
+        with mininode_lock:
+            if self.test_node.last_cmpctblock is None:
+                self.test_node.clear_block_announcement()
+                inv = CInv(4, block_hash)  # 4 == "CompactBlock"
+                self.test_node.send_message(msg_getdata([inv]))
+
+        wait_until(self.test_node.received_block_announcement, timeout=30)
+
+        # Now we should have the compactblock
+        header_and_shortids = None
+        with mininode_lock:
+            assert(self.test_node.last_cmpctblock is not None)
+            # Convert the on-the-wire representation to absolute indexes
+            header_and_shortids = HeaderAndShortIDs(self.test_node.last_cmpctblock.header_and_shortids)
+
+        # Check that we got the right block!
+        header_and_shortids.header.calc_sha256()
+        assert_equal(header_and_shortids.header.sha256, block_hash)
+
+        # Make sure the prefilled_txn appears to have included the coinbase
+        assert(len(header_and_shortids.prefilled_txn) >= 1)
+        assert_equal(header_and_shortids.prefilled_txn[0].index, 0)
+
+        # Check that all prefilled_txn entries match what's in the block.
+        for entry in header_and_shortids.prefilled_txn:
+            entry.tx.calc_sha256()
+            assert_equal(entry.tx.sha256, block.vtx[entry.index].sha256)
+
+        # Check that the cmpctblock message announced all the transactions.
+        assert_equal(len(header_and_shortids.prefilled_txn) + len(header_and_shortids.shortids), len(block.vtx))
+
+        # And now check that all the shortids are as expected as well.
+        # Determine the siphash keys to use.
+        [k0, k1] = header_and_shortids.get_siphash_keys()
+
+        index = 0
+        while index < len(block.vtx):
+            if (len(header_and_shortids.prefilled_txn) > 0 and
+                    header_and_shortids.prefilled_txn[0].index == index):
+                # Already checked prefilled transactions above
+                header_and_shortids.prefilled_txn.pop(0)
+            else:
+                shortid = calculate_shortid(k0, k1, block.vtx[index].sha256)
+                assert_equal(shortid, header_and_shortids.shortids[0])
+                header_and_shortids.shortids.pop(0)
+            index += 1
+
+    # Test that bitcoind requests compact blocks when we announce new blocks
+    # via header or inv, and that responding to getblocktxn causes the block
+    # to be successfully reconstructed.
+    def test_compactblock_requests(self):
+        print("Testing compactblock requests... ")
+
+        # Try announcing a block with an inv or header, expect a compactblock
+        # request
+        for announce in ["inv", "header"]:
+            block = self.build_block_on_tip()
+            with mininode_lock:
+                self.test_node.last_getdata = None
+
+            if announce == "inv":
+                self.test_node.send_message(msg_inv([CInv(2, block.sha256)]))
+            else:
+                self.test_node.send_header_for_blocks([block])
+            success = wait_until(lambda: self.test_node.last_getdata is not None, timeout=30)
+            assert(success)
+            assert_equal(len(self.test_node.last_getdata.inv), 1)
+            assert_equal(self.test_node.last_getdata.inv[0].type, 4)
+            assert_equal(self.test_node.last_getdata.inv[0].hash, block.sha256)
+
+            # Send back a compactblock message that omits the coinbase
+            comp_block = HeaderAndShortIDs()
+            comp_block.header = CBlockHeader(block)
+            comp_block.nonce = 0
+            comp_block.shortids = [1]  # this is useless, and wrong
+            self.test_node.send_and_ping(msg_cmpctblock(comp_block.to_p2p()))
+            assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.hashPrevBlock)
+            # Expect a getblocktxn message.
+            with mininode_lock:
+                assert(self.test_node.last_getblocktxn is not None)
+                absolute_indexes = self.test_node.last_getblocktxn.block_txn_request.to_absolute()
+            assert_equal(absolute_indexes, [0])  # should be a coinbase request
+
+            # Send the coinbase, and verify that the tip advances.
+            msg = msg_blocktxn()
+            msg.block_transactions.blockhash = block.sha256
+            msg.block_transactions.transactions = [block.vtx[0]]
+            self.test_node.send_and_ping(msg)
+            assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
+
+    # Create a chain of transactions from given utxo, and add to a new block.
+    def build_block_with_transactions(self, utxo, num_transactions):
+        block = self.build_block_on_tip()
+
+        for i in range(num_transactions):
+            tx = CTransaction()
+            tx.vin.append(CTxIn(COutPoint(utxo[0], utxo[1]), b''))
+            tx.vout.append(CTxOut(utxo[2] - 1000, CScript([OP_TRUE])))
+            tx.rehash()
+            utxo = [tx.sha256, 0, tx.vout[0].nValue]
+            block.vtx.append(tx)
+
+        block.hashMerkleRoot = block.calc_merkle_root()
+        block.solve()
+        return block
+
+    # Test that we only receive getblocktxn requests for transactions that the
+    # node needs, and that responding to them causes the block to be
+    # reconstructed.
+    def test_getblocktxn_requests(self):
+        print("Testing getblocktxn requests...")
+
+        # First try announcing compactblocks that won't reconstruct, and verify
+        # that we receive getblocktxn messages back.
+        utxo = self.utxos.pop(0)
+
+        block = self.build_block_with_transactions(utxo, 5)
+        self.utxos.append([block.vtx[-1].sha256, 0, block.vtx[-1].vout[0].nValue])
+
+        comp_block = HeaderAndShortIDs()
+        comp_block.initialize_from_block(block)
+
+        self.test_node.send_and_ping(msg_cmpctblock(comp_block.to_p2p()))
+        with mininode_lock:
+            assert(self.test_node.last_getblocktxn is not None)
+            absolute_indexes = self.test_node.last_getblocktxn.block_txn_request.to_absolute()
+        assert_equal(absolute_indexes, [1, 2, 3, 4, 5])
+        msg = msg_blocktxn()
+        msg.block_transactions = BlockTransactions(block.sha256, block.vtx[1:])
+        self.test_node.send_and_ping(msg)
+        assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
+
+        utxo = self.utxos.pop(0)
+        block = self.build_block_with_transactions(utxo, 5)
+        self.utxos.append([block.vtx[-1].sha256, 0, block.vtx[-1].vout[0].nValue])
+
+        # Now try interspersing the prefilled transactions
+        comp_block.initialize_from_block(block, prefill_list=[0, 1, 5])
+        self.test_node.send_and_ping(msg_cmpctblock(comp_block.to_p2p()))
+        with mininode_lock:
+            assert(self.test_node.last_getblocktxn is not None)
+            absolute_indexes = self.test_node.last_getblocktxn.block_txn_request.to_absolute()
+        assert_equal(absolute_indexes, [2, 3, 4])
+        msg.block_transactions = BlockTransactions(block.sha256, block.vtx[2:5])
+        self.test_node.send_and_ping(msg)
+        assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
+
+        # Now try giving one transaction ahead of time.
+        utxo = self.utxos.pop(0)
+        block = self.build_block_with_transactions(utxo, 5)
+        self.utxos.append([block.vtx[-1].sha256, 0, block.vtx[-1].vout[0].nValue])
+        self.test_node.send_and_ping(msg_tx(block.vtx[1]))
+        assert(block.vtx[1].hash in self.nodes[0].getrawmempool())
+
+        # Prefill 4 out of the 6 transactions, and verify that only the one
+        # that was not in the mempool is requested.
+        comp_block.initialize_from_block(block, prefill_list=[0, 2, 3, 4])
+        self.test_node.send_and_ping(msg_cmpctblock(comp_block.to_p2p()))
+        with mininode_lock:
+            assert(self.test_node.last_getblocktxn is not None)
+            absolute_indexes = self.test_node.last_getblocktxn.block_txn_request.to_absolute()
+        assert_equal(absolute_indexes, [5])
+
+        msg.block_transactions = BlockTransactions(block.sha256, [block.vtx[5]])
+        self.test_node.send_and_ping(msg)
+        assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
+
+        # Now provide all transactions to the node before the block is
+        # announced and verify reconstruction happens immediately.
+        utxo = self.utxos.pop(0)
+        block = self.build_block_with_transactions(utxo, 10)
+        self.utxos.append([block.vtx[-1].sha256, 0, block.vtx[-1].vout[0].nValue])
+        for tx in block.vtx[1:]:
+            self.test_node.send_message(msg_tx(tx))
+        self.test_node.sync_with_ping()
+        # Make sure all transactions were accepted.
+        mempool = self.nodes[0].getrawmempool()
+        for tx in block.vtx[1:]:
+            assert(tx.hash in mempool)
+
+        # Clear out last request.
+        with mininode_lock:
+            self.test_node.last_getblocktxn = None
+
+        # Send compact block
+        comp_block.initialize_from_block(block, prefill_list=[0])
+        self.test_node.send_and_ping(msg_cmpctblock(comp_block.to_p2p()))
+        with mininode_lock:
+            # Shouldn't have gotten a request for any transaction
+            assert(self.test_node.last_getblocktxn is None)
+        # Tip should have updated
+        assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
+
+    # Incorrectly responding to a getblocktxn shouldn't cause the block to be
+    # permanently failed.
+    def test_incorrect_blocktxn_response(self):
+        print("Testing handling of incorrect blocktxn responses...")
+
+        if (len(self.utxos) == 0):
+            self.make_utxos()
+        utxo = self.utxos.pop(0)
+
+        block = self.build_block_with_transactions(utxo, 10)
+        self.utxos.append([block.vtx[-1].sha256, 0, block.vtx[-1].vout[0].nValue])
+        # Relay the first 5 transactions from the block in advance
+        for tx in block.vtx[1:6]:
+            self.test_node.send_message(msg_tx(tx))
+        self.test_node.sync_with_ping()
+        # Make sure all transactions were accepted.
+        mempool = self.nodes[0].getrawmempool()
+        for tx in block.vtx[1:6]:
+            assert(tx.hash in mempool)
+
+        # Send compact block
+        comp_block = HeaderAndShortIDs()
+        comp_block.initialize_from_block(block, prefill_list=[0])
+        self.test_node.send_and_ping(msg_cmpctblock(comp_block.to_p2p()))
+        absolute_indexes = []
+        with mininode_lock:
+            assert(self.test_node.last_getblocktxn is not None)
+            absolute_indexes = self.test_node.last_getblocktxn.block_txn_request.to_absolute()
+        assert_equal(absolute_indexes, [6, 7, 8, 9, 10])
+
+        # Now give an incorrect response.
+        # Note that it's possible for bitcoind to be smart enough to know we're
+        # lying, since it could check to see if the shortid matches what we're
+        # sending, and eg disconnect us for misbehavior.  If that behavior
+        # change were made, we could just modify this test by having a
+        # different peer provide the block further down, so that we're still
+        # verifying that the block isn't marked bad permanently. This is good
+        # enough for now.
+        msg = msg_blocktxn()
+        msg.block_transactions = BlockTransactions(block.sha256, [block.vtx[5]] + block.vtx[7:])
+        self.test_node.send_and_ping(msg)
+
+        # Tip should not have updated
+        assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.hashPrevBlock)
+
+        # We should receive a getdata request
+        success = wait_until(lambda: self.test_node.last_getdata is not None, timeout=10)
+        assert(success)
+        assert_equal(len(self.test_node.last_getdata.inv), 1)
+        assert_equal(self.test_node.last_getdata.inv[0].type, 2)
+        assert_equal(self.test_node.last_getdata.inv[0].hash, block.sha256)
+
+        # Deliver the block
+        self.test_node.send_and_ping(msg_block(block))
+        assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
+
+    def test_getblocktxn_handler(self):
+        print("Testing getblocktxn handler...")
+
+        # bitcoind won't respond for blocks whose height is more than 15 blocks
+        # deep.
+        MAX_GETBLOCKTXN_DEPTH = 15
+        chain_height = self.nodes[0].getblockcount()
+        current_height = chain_height
+        while (current_height >= chain_height - MAX_GETBLOCKTXN_DEPTH):
+            block_hash = self.nodes[0].getblockhash(current_height)
+            block = FromHex(CBlock(), self.nodes[0].getblock(block_hash, False))
+
+            msg = msg_getblocktxn()
+            msg.block_txn_request = BlockTransactionsRequest(int(block_hash, 16), [])
+            num_to_request = random.randint(1, len(block.vtx))
+            msg.block_txn_request.from_absolute(sorted(random.sample(range(len(block.vtx)), num_to_request)))
+            self.test_node.send_message(msg)
+            success = wait_until(lambda: self.test_node.last_blocktxn is not None, timeout=10)
+            assert(success)
+
+            [tx.calc_sha256() for tx in block.vtx]
+            with mininode_lock:
+                assert_equal(self.test_node.last_blocktxn.block_transactions.blockhash, int(block_hash, 16))
+                all_indices = msg.block_txn_request.to_absolute()
+                for index in all_indices:
+                    tx = self.test_node.last_blocktxn.block_transactions.transactions.pop(0)
+                    tx.calc_sha256()
+                    assert_equal(tx.sha256, block.vtx[index].sha256)
+                self.test_node.last_blocktxn = None
+            current_height -= 1
+
+        # Next request should be ignored, as we're past the allowed depth.
+        block_hash = self.nodes[0].getblockhash(current_height)
+        msg.block_txn_request = BlockTransactionsRequest(int(block_hash, 16), [0])
+        self.test_node.send_and_ping(msg)
+        with mininode_lock:
+            assert_equal(self.test_node.last_blocktxn, None)
+
+    def test_compactblocks_not_at_tip(self):
+        print("Testing compactblock requests/announcements not at chain tip...")
+
+        # Test that requesting old compactblocks doesn't work.
+        MAX_CMPCTBLOCK_DEPTH = 11
+        new_blocks = []
+        for i in range(MAX_CMPCTBLOCK_DEPTH):
+            self.test_node.clear_block_announcement()
+            new_blocks.append(self.nodes[0].generate(1)[0])
+            wait_until(self.test_node.received_block_announcement, timeout=30)
+
+        self.test_node.clear_block_announcement()
+        self.test_node.send_message(msg_getdata([CInv(4, int(new_blocks[0], 16))]))
+        success = wait_until(lambda: self.test_node.last_cmpctblock is not None, timeout=30)
+        assert(success)
+
+        self.test_node.clear_block_announcement()
+        self.nodes[0].generate(1)
+        wait_until(self.test_node.received_block_announcement, timeout=30)
+        self.test_node.clear_block_announcement()
+        self.test_node.send_message(msg_getdata([CInv(4, int(new_blocks[0], 16))]))
+        success = wait_until(lambda: self.test_node.last_block is not None, timeout=30)
+        assert(success)
+        with mininode_lock:
+            self.test_node.last_block.block.calc_sha256()
+            assert_equal(self.test_node.last_block.block.sha256, int(new_blocks[0], 16))
+
+        # Generate an old compactblock, and verify that it's not accepted.
+        cur_height = self.nodes[0].getblockcount()
+        hashPrevBlock = int(self.nodes[0].getblockhash(cur_height-5), 16)
+        block = self.build_block_on_tip()
+        block.hashPrevBlock = hashPrevBlock
+        block.solve()
+
+        comp_block = HeaderAndShortIDs()
+        comp_block.initialize_from_block(block)
+        self.test_node.send_and_ping(msg_cmpctblock(comp_block.to_p2p()))
+
+        tips = self.nodes[0].getchaintips()
+        found = False
+        for x in tips:
+            if x["hash"] == block.hash:
+                assert_equal(x["status"], "headers-only")
+                found = True
+                break
+        assert(found)
+
+        # Requesting this block via getblocktxn should silently fail
+        # (to avoid fingerprinting attacks).
+        msg = msg_getblocktxn()
+        msg.block_txn_request = BlockTransactionsRequest(block.sha256, [0])
+        with mininode_lock:
+            self.test_node.last_blocktxn = None
+        self.test_node.send_and_ping(msg)
+        with mininode_lock:
+            assert(self.test_node.last_blocktxn is None)
+
+    def run_test(self):
+        # Setup the p2p connections and start up the network thread.
+        self.test_node = TestNode()
+
+        connections = []
+        connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], self.test_node))
+        self.test_node.add_connection(connections[0])
+
+        NetworkThread().start()  # Start up network handling in another thread
+
+        # Test logic begins here
+        self.test_node.wait_for_verack()
+
+        # We will need UTXOs to construct transactions in later tests.
+        self.make_utxos()
+
+        self.test_sendcmpct()
+        self.test_compactblock_construction()
+        self.test_compactblock_requests()
+        self.test_getblocktxn_requests()
+        self.test_getblocktxn_handler()
+        self.test_compactblocks_not_at_tip()
+        self.test_incorrect_blocktxn_response()
+        self.test_invalid_cmpctblock_message()
+
+
+if __name__ == '__main__':
+    CompactBlocksTest().main()