def test_compactblocks_not_at_tip(self, node, test_node):
# Test that requesting old compactblocks doesn't work.
MAX_CMPCTBLOCK_DEPTH = 5
new_blocks = []
for _ in range(MAX_CMPCTBLOCK_DEPTH + 1):
test_node.clear_block_announcement()
new_blocks.append(node.generate(1)[0])
wait_until(test_node.received_block_announcement, timeout=30, lock=mininode_lock, err_msg="test_compactblocks_not_at_tip test_node.received_block_announcement")
test_node.clear_block_announcement()
test_node.send_message(MsgGetdata([CInv(4, int(new_blocks[0], 16))]))
wait_until(lambda: "cmpctblock" in test_node.last_message, timeout=30, lock=mininode_lock, err_msg="test_compactblocks_not_at_tip testnode.last_message")
test_node.clear_block_announcement()
node.generate(1)
wait_until(test_node.received_block_announcement, timeout=30, lock=mininode_lock, err_msg="test_compactblocks_not_at_tip test_node.received_block_announcement")
test_node.clear_block_announcement()
with mininode_lock:
test_node.last_message.pop("block", None)
test_node.send_message(MsgGetdata([CInv(4, int(new_blocks[0], 16))]))
wait_until(lambda: "block" in test_node.last_message, timeout=30, lock=mininode_lock, err_msg="test_node.received_block_announcement test_node.last_message")
with mininode_lock:
test_node.last_message["block"].block.calc_x16r()
assert_equal(test_node.last_message["block"].block.sha256, int(new_blocks[0], 16))
# Generate an old compactblock, and verify that it's not accepted.
cur_height = node.getblockcount()
hashPrevBlock = int(node.getblockhash(cur_height-5), 16)
block = self.build_block_on_tip(node)
block.hashPrevBlock = hashPrevBlock
block.solve()
comp_block = HeaderAndShortIDs()
comp_block.initialize_from_block(block)
test_node.send_and_ping(MsgCmpctBlock(comp_block.to_p2p()))
tips = node.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 = MsgGetBlockTxn()
msg.block_txn_request = BlockTransactionsRequest(block.sha256, [0])
with mininode_lock:
test_node.last_message.pop("blocktxn", None)
test_node.send_and_ping(msg)
with mininode_lock:
assert "blocktxn" not in test_node.last_message
def run_test(self):
gen_node = self.nodes[0] # The block and tx generating node
gen_node.generate(1)
# Setup the attacking p2p connection and start up the network thread.
self.inbound_peer = TestNode()
connections = [NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], self.inbound_peer)]
self.inbound_peer.add_connection(connections[0])
NetworkThread().start() # Start up network handling in another thread
max_repeats = 48
self.log.info("Running test up to {} times.".format(max_repeats))
for i in range(max_repeats):
self.log.info('Run repeat {}'.format(i + 1))
txid = gen_node.sendtoaddress(gen_node.getnewaddress(), 0.01)
want_tx = MsgGetdata()
want_tx.inv.append(CInv(t=1, h=int(txid, 16)))
self.inbound_peer.last_message.pop('notfound', None)
connections[0].send_message(want_tx)
self.inbound_peer.sync_with_ping()
if self.inbound_peer.last_message.get('notfound'):
self.log.debug('tx {} was not yet announced to us.'.format(txid))
self.log.debug("node has responded with a notfound message. End test.")
assert_equal(self.inbound_peer.last_message['notfound'].vec[0].hash, int(txid, 16))
self.inbound_peer.last_message.pop('notfound')
break
else:
self.log.debug('tx {} was already announced to us. Try test again.'.format(txid))
assert int(txid, 16) in [inv.hash for inv in self.inbound_peer.last_message['inv'].inv]
def test_compactblock_construction(self, node, test_node, version,
use_witness_address):
# Generate a bunch of transactions.
node.generate(101)
num_transactions = 25
address = node.getnewaddress()
if use_witness_address:
# Want at least one segwit spend, so move all funds to
# a witness address.
address = node.addwitnessaddress(address)
value_to_send = node.getbalance()
node.sendtoaddress(address,
satoshi_round(value_to_send - Decimal(0.1)))
node.generate(1)
segwit_tx_generated = False
for _ in range(num_transactions):
txid = node.sendtoaddress(address, 0.1)
hex_tx = node.gettransaction(txid)["hex"]
tx = from_hex(CTransaction(), hex_tx)
if not tx.wit.is_null():
segwit_tx_generated = True
if use_witness_address:
assert segwit_tx_generated # check that our test is not broken
# Wait until we've seen the block announcement for the resulting tip
tip = int(node.getbestblockhash(), 16)
test_node.wait_for_block_announcement(tip)
# Make sure we will receive a fast-announce compact block
self.request_cb_announcements(test_node, node, version)
# Now mine a block, and look at the resulting compact block.
test_node.clear_block_announcement()
block_hash = int(node.generate(1)[0], 16)
# Store the raw block in our internal format.
block = from_hex(CBlock(), node.getblock("%02x" % block_hash, False))
for tx in block.vtx:
tx.calc_x16r()
block.rehash()
# Wait until the block was announced (via compact blocks)
wait_until(test_node.received_block_announcement,
timeout=30,
lock=mininode_lock,
err_msg="test_node.received_block_announcement")
# Now fetch and check the compact block
with mininode_lock:
assert ("cmpctblock" in test_node.last_message)
# Convert the on-the-wire representation to absolute indexes
header_and_shortids = HeaderAndShortIDs(
test_node.last_message["cmpctblock"].header_and_shortids)
self.check_compactblock_construction_from_block(
version, header_and_shortids, block_hash, block)
# Now fetch the compact block using a normal non-announce getdata
with mininode_lock:
test_node.clear_block_announcement()
inv = CInv(4, block_hash) # 4 == "CompactBlock"
test_node.send_message(MsgGetdata([inv]))
wait_until(test_node.received_block_announcement,
timeout=30,
lock=mininode_lock,
err_msg="test_node.received_block_announcement")
# Now fetch and check the compact block
with mininode_lock:
assert ("cmpctblock" in test_node.last_message)
# Convert the on-the-wire representation to absolute indexes
header_and_shortids = HeaderAndShortIDs(
test_node.last_message["cmpctblock"].header_and_shortids)
self.check_compactblock_construction_from_block(
version, header_and_shortids, block_hash, block)
def send_block_request(block_hash, node):
msg = MsgGetdata()
msg.inv.append(CInv(2, block_hash)) # 2 == "Block"
node.send_message(msg)
def get_data(self, block_hashes):
msg = MsgGetdata()
for x in block_hashes:
msg.inv.append(CInv(2, x))
self.connection.send_message(msg)
def run_test(self):
"""Main test logic"""
# Create a P2P connection to one of the nodes
node0 = BaseNode()
connections = [
NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], node0)
]
node0.add_connection(connections[0])
# Start up network handling in another thread. This needs to be called
# after the P2P connections have been created.
NetworkThread().start()
# wait_for_verack ensures that the P2P connection is fully up.
node0.wait_for_verack()
# Generating a block on one of the nodes will get us out of IBD
blocks = [int(self.nodes[0].generate(nblocks=1)[0], 16)]
self.sync_all([self.nodes[0:1]])
# Notice above how we called an RPC by calling a method with the same
# name on the node object. Notice also how we used a keyword argument
# to specify a named RPC argument. Neither of those are defined on the
# node object. Instead there's some __getattr__() magic going on under
# the covers to dispatch unrecognised attribute calls to the RPC
# interface.
# Logs are nice. Do plenty of them. They can be used in place of comments for
# breaking the test into sub-sections.
self.log.info("Starting test!")
self.log.info("Calling a custom function")
custom_function()
self.log.info("Calling a custom method")
self.custom_method()
self.log.info("Create some blocks")
self.tip = int(self.nodes[0].getbestblockhash(), 16)
self.block_time = self.nodes[0].getblock(
self.nodes[0].getbestblockhash())['time'] + 1
self.nodes[0].generate(10)
self.log.info(
"Wait for node1 to reach current tip (height 11) using RPC")
self.nodes[1].waitforblockheight(11)
self.log.info("Connect node2 and node1")
connect_nodes(self.nodes[1], 2)
self.log.info("Add P2P connection to node2")
node2 = BaseNode()
connections.append(
NodeConn('127.0.0.1', p2p_port(2), self.nodes[2], node2))
node2.add_connection(connections[1])
node2.wait_for_verack()
self.log.info(
"Wait for node2 reach current tip. Test that it has propagated all the blocks to us"
)
getdata_request = MsgGetdata()
for block in blocks:
getdata_request.inv.append(CInv(2, block))
node2.send_message(getdata_request)
self.sync_all([self.nodes[1:2]])
self.log.info("Check that each block was received only once")
# The network thread uses a global lock on data access to the NodeConn objects when sending and receiving
# messages. The test thread should acquire the global lock before accessing any NodeConn data to avoid locking
# and synchronization issues. Note wait_until() acquires this global lock when testing the predicate.
with mininode_lock:
for block in node2.block_receive_map.values():
assert_equal(block, 1)
def run_test(self):
# Before we connect anything, we first set the time on the node
# to be in the past, otherwise things break because the CNode
# time counters can't be reset backward after initialization
old_time = int(time.time() - 2 * 60 * 60 * 24 * 7)
self.nodes[0].setmocktime(old_time)
# Generate some old blocks
self.nodes[0].generate(130)
# test_nodes[0] will only request old blocks
# test_nodes[1] will only request new blocks
# test_nodes[2] will test resetting the counters
test_nodes = []
connections = []
for i in range(3):
test_nodes.append(TestNode())
connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], test_nodes[i]))
test_nodes[i].add_connection(connections[i])
NetworkThread().start() # Start up network handling in another thread
[x.wait_for_verack() for x in test_nodes]
# Test logic begins here
# Now mine a big block
mine_large_block(self.nodes[0], self.utxo_cache)
# Store the hash; we'll request this later
big_old_block = self.nodes[0].getbestblockhash()
old_block_size = self.nodes[0].getblock(big_old_block, True)['size']
big_old_block = int(big_old_block, 16)
# Advance to two days ago
self.nodes[0].setmocktime(int(time.time()) - 2 * 60 * 60 * 24)
# Mine one more block, so that the prior block looks old
mine_large_block(self.nodes[0], self.utxo_cache)
# We'll be requesting this new block too
big_new_block = self.nodes[0].getbestblockhash()
big_new_block = int(big_new_block, 16)
# test_nodes[0] will test what happens if we just keep requesting the
# the same big old block too many times (expect: disconnect)
getdata_request = MsgGetdata()
getdata_request.inv.append(CInv(2, big_old_block))
block_rate_minutes = 1
blocks_per_day = 24 * 60 / block_rate_minutes
max_block_serialized_size = 8000000 # This is MAX_BLOCK_SERIALIZED_SIZE_RIP2
max_bytes_per_day = self.maxuploadtarget * 1024 * 1024
daily_buffer = blocks_per_day * max_block_serialized_size
max_bytes_available = max_bytes_per_day - daily_buffer
success_count = max_bytes_available // old_block_size
# 224051200B will be reserved for relaying new blocks, so expect this to
# succeed for ~236 tries.
for i in range(int(success_count)):
test_nodes[0].send_message(getdata_request)
test_nodes[0].sync_with_ping()
assert_equal(test_nodes[0].block_receive_map[big_old_block], i + 1)
assert_equal(len(self.nodes[0].getpeerinfo()), 3)
# At most a couple more tries should succeed (depending on how long
# the test has been running so far).
for i in range(3):
test_nodes[0].send_message(getdata_request)
test_nodes[0].wait_for_disconnect()
assert_equal(len(self.nodes[0].getpeerinfo()), 2)
self.log.info("Peer 0 disconnected after downloading old block too many times")
# Requesting the current block on test_nodes[1] should succeed indefinitely,
# even when over the max upload target.
# We'll try lots of times
getdata_request.inv = [CInv(2, big_new_block)]
for i in range(500):
test_nodes[1].send_message(getdata_request)
test_nodes[1].sync_with_ping()
assert_equal(test_nodes[1].block_receive_map[big_new_block], i + 1)
self.log.info("Peer 1 able to repeatedly download new block")
# But if test_nodes[1] tries for an old block, it gets disconnected too.
getdata_request.inv = [CInv(2, big_old_block)]
test_nodes[1].send_message(getdata_request)
test_nodes[1].wait_for_disconnect()
assert_equal(len(self.nodes[0].getpeerinfo()), 1)
self.log.info("Peer 1 disconnected after trying to download old block")
self.log.info("Advancing system time on node to clear counters...")
# If we advance the time by 24 hours, then the counters should reset,
# and test_nodes[2] should be able to retrieve the old block.
self.nodes[0].setmocktime(int(time.time()))
test_nodes[2].sync_with_ping()
test_nodes[2].send_message(getdata_request)
test_nodes[2].sync_with_ping()
assert_equal(test_nodes[2].block_receive_map[big_old_block], 1)
self.log.info("Peer 2 able to download old block")
[c.disconnect_node() for c in connections]
# stop and start node 0 with 1MB maxuploadtarget, whitelist 127.0.0.1
self.log.info("Restarting nodes with -whitelist=127.0.0.1")
self.stop_node(0)
self.start_node(0, ["-whitelist=127.0.0.1", "-maxuploadtarget=1", "-blockmaxsize=999000"])
# recreate/reconnect a test node
test_nodes = [TestNode()]
connections = [NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], test_nodes[0])]
test_nodes[0].add_connection(connections[0])
NetworkThread().start() # Start up network handling in another thread
test_nodes[0].wait_for_verack()
# retrieve 20 blocks which should be enough to break the 1MB limit
getdata_request.inv = [CInv(2, big_new_block)]
for i in range(20):
test_nodes[0].send_message(getdata_request)
test_nodes[0].sync_with_ping()
assert_equal(test_nodes[0].block_receive_map[big_new_block], i + 1)
getdata_request.inv = [CInv(2, big_old_block)]
test_nodes[0].send_and_ping(getdata_request)
assert_equal(len(self.nodes[0].getpeerinfo()), 1) # node is still connected because of the whitelist
self.log.info("Peer still connected after trying to download old block (whitelisted)")
