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263 lines
11 KiB
263 lines
11 KiB
#!/usr/bin/env python3
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# Copyright (c) 2015-2016 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Test processing of unrequested blocks.
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Since behavior differs when receiving unrequested blocks from whitelisted peers
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versus non-whitelisted peers, this tests the behavior of both (effectively two
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separate tests running in parallel).
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Setup: two nodes, node0 and node1, not connected to each other. Node0 does not
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whitelist localhost, but node1 does. They will each be on their own chain for
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this test.
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We have one NodeConn connection to each, test_node and white_node respectively.
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The test:
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1. Generate one block on each node, to leave IBD.
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2. Mine a new block on each tip, and deliver to each node from node's peer.
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The tip should advance.
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3. Mine a block that forks the previous block, and deliver to each node from
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corresponding peer.
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Node0 should not process this block (just accept the header), because it is
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unrequested and doesn't have more work than the tip.
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Node1 should process because this is coming from a whitelisted peer.
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4. Send another block that builds on the forking block.
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Node0 should process this block but be stuck on the shorter chain, because
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it's missing an intermediate block.
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Node1 should reorg to this longer chain.
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4b.Send 288 more blocks on the longer chain.
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Node0 should process all but the last block (too far ahead in height).
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Send all headers to Node1, and then send the last block in that chain.
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Node1 should accept the block because it's coming from a whitelisted peer.
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5. Send a duplicate of the block in #3 to Node0.
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Node0 should not process the block because it is unrequested, and stay on
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the shorter chain.
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6. Send Node0 an inv for the height 3 block produced in #4 above.
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Node0 should figure out that Node0 has the missing height 2 block and send a
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getdata.
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7. Send Node0 the missing block again.
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Node0 should process and the tip should advance.
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"""
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from test_framework.mininode import *
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import *
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import time
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from test_framework.blocktools import create_block, create_coinbase
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# TestNode: bare-bones "peer". Used mostly as a conduit for a test to sending
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# p2p messages to a node, generating the messages in the main testing logic.
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class TestNode(NodeConnCB):
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def __init__(self):
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super().__init__()
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self.connection = None
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self.ping_counter = 1
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self.last_pong = msg_pong()
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def add_connection(self, conn):
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self.connection = conn
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# Track the last getdata message we receive (used in the test)
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def on_getdata(self, conn, message):
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self.last_getdata = message
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# Spin until verack message is received from the node.
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# We use this to signal that our test can begin. This
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# is called from the testing thread, so it needs to acquire
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# the global lock.
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def wait_for_verack(self):
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while True:
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with mininode_lock:
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if self.verack_received:
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return
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time.sleep(0.05)
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# Wrapper for the NodeConn's send_message function
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def send_message(self, message):
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self.connection.send_message(message)
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def on_pong(self, conn, message):
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self.last_pong = message
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class AcceptBlockTest(BitcoinTestFramework):
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def add_options(self, parser):
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parser.add_option("--testbinary", dest="testbinary",
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default=os.getenv("BITCOIND", "bitcoind"),
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help="bitcoind binary to test")
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def __init__(self):
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super().__init__()
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self.setup_clean_chain = True
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self.num_nodes = 2
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def setup_network(self):
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# Node0 will be used to test behavior of processing unrequested blocks
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# from peers which are not whitelisted, while Node1 will be used for
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# the whitelisted case.
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self.nodes = []
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self.nodes.append(start_node(0, self.options.tmpdir,
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binary=self.options.testbinary))
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self.nodes.append(start_node(1, self.options.tmpdir,
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["-whitelist=127.0.0.1"],
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binary=self.options.testbinary))
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def run_test(self):
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# Setup the p2p connections and start up the network thread.
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test_node = TestNode() # connects to node0 (not whitelisted)
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white_node = TestNode() # connects to node1 (whitelisted)
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connections = []
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connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], test_node))
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connections.append(NodeConn('127.0.0.1', p2p_port(1), self.nodes[1], white_node))
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test_node.add_connection(connections[0])
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white_node.add_connection(connections[1])
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NetworkThread().start() # Start up network handling in another thread
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# Test logic begins here
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test_node.wait_for_verack()
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white_node.wait_for_verack()
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# 1. Have both nodes mine a block (leave IBD)
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[ n.generate(1) for n in self.nodes ]
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tips = [ int("0x" + n.getbestblockhash(), 0) for n in self.nodes ]
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# 2. Send one block that builds on each tip.
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# This should be accepted.
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blocks_h2 = [] # the height 2 blocks on each node's chain
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block_time = int(time.time()) + 1
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for i in range(2):
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blocks_h2.append(create_block(tips[i], create_coinbase(2), block_time))
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blocks_h2[i].solve()
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block_time += 1
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test_node.send_message(msg_block(blocks_h2[0]))
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white_node.send_message(msg_block(blocks_h2[1]))
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[ x.sync_with_ping() for x in [test_node, white_node] ]
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assert_equal(self.nodes[0].getblockcount(), 2)
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assert_equal(self.nodes[1].getblockcount(), 2)
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self.log.info("First height 2 block accepted by both nodes")
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# 3. Send another block that builds on the original tip.
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blocks_h2f = [] # Blocks at height 2 that fork off the main chain
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for i in range(2):
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blocks_h2f.append(create_block(tips[i], create_coinbase(2), blocks_h2[i].nTime+1))
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blocks_h2f[i].solve()
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test_node.send_message(msg_block(blocks_h2f[0]))
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white_node.send_message(msg_block(blocks_h2f[1]))
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[ x.sync_with_ping() for x in [test_node, white_node] ]
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for x in self.nodes[0].getchaintips():
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if x['hash'] == blocks_h2f[0].hash:
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assert_equal(x['status'], "headers-only")
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for x in self.nodes[1].getchaintips():
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if x['hash'] == blocks_h2f[1].hash:
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assert_equal(x['status'], "valid-headers")
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self.log.info("Second height 2 block accepted only from whitelisted peer")
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# 4. Now send another block that builds on the forking chain.
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blocks_h3 = []
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for i in range(2):
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blocks_h3.append(create_block(blocks_h2f[i].sha256, create_coinbase(3), blocks_h2f[i].nTime+1))
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blocks_h3[i].solve()
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test_node.send_message(msg_block(blocks_h3[0]))
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white_node.send_message(msg_block(blocks_h3[1]))
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[ x.sync_with_ping() for x in [test_node, white_node] ]
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# Since the earlier block was not processed by node0, the new block
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# can't be fully validated.
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for x in self.nodes[0].getchaintips():
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if x['hash'] == blocks_h3[0].hash:
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assert_equal(x['status'], "headers-only")
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# But this block should be accepted by node0 since it has more work.
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self.nodes[0].getblock(blocks_h3[0].hash)
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self.log.info("Unrequested more-work block accepted from non-whitelisted peer")
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# Node1 should have accepted and reorged.
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assert_equal(self.nodes[1].getblockcount(), 3)
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self.log.info("Successfully reorged to length 3 chain from whitelisted peer")
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# 4b. Now mine 288 more blocks and deliver; all should be processed but
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# the last (height-too-high) on node0. Node1 should process the tip if
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# we give it the headers chain leading to the tip.
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tips = blocks_h3
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headers_message = msg_headers()
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all_blocks = [] # node0's blocks
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for j in range(2):
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for i in range(288):
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next_block = create_block(tips[j].sha256, create_coinbase(i + 4), tips[j].nTime+1)
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next_block.solve()
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if j==0:
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test_node.send_message(msg_block(next_block))
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all_blocks.append(next_block)
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else:
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headers_message.headers.append(CBlockHeader(next_block))
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tips[j] = next_block
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time.sleep(2)
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# Blocks 1-287 should be accepted, block 288 should be ignored because it's too far ahead
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for x in all_blocks[:-1]:
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self.nodes[0].getblock(x.hash)
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assert_raises_jsonrpc(-1, "Block not found on disk", self.nodes[0].getblock, all_blocks[-1].hash)
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headers_message.headers.pop() # Ensure the last block is unrequested
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white_node.send_message(headers_message) # Send headers leading to tip
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white_node.send_message(msg_block(tips[1])) # Now deliver the tip
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white_node.sync_with_ping()
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self.nodes[1].getblock(tips[1].hash)
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self.log.info("Unrequested block far ahead of tip accepted from whitelisted peer")
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# 5. Test handling of unrequested block on the node that didn't process
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# Should still not be processed (even though it has a child that has more
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# work).
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test_node.send_message(msg_block(blocks_h2f[0]))
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# Here, if the sleep is too short, the test could falsely succeed (if the
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# node hasn't processed the block by the time the sleep returns, and then
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# the node processes it and incorrectly advances the tip).
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# But this would be caught later on, when we verify that an inv triggers
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# a getdata request for this block.
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test_node.sync_with_ping()
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assert_equal(self.nodes[0].getblockcount(), 2)
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self.log.info("Unrequested block that would complete more-work chain was ignored")
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# 6. Try to get node to request the missing block.
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# Poke the node with an inv for block at height 3 and see if that
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# triggers a getdata on block 2 (it should if block 2 is missing).
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with mininode_lock:
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# Clear state so we can check the getdata request
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test_node.last_getdata = None
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test_node.send_message(msg_inv([CInv(2, blocks_h3[0].sha256)]))
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test_node.sync_with_ping()
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with mininode_lock:
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getdata = test_node.last_getdata
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# Check that the getdata includes the right block
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assert_equal(getdata.inv[0].hash, blocks_h2f[0].sha256)
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self.log.info("Inv at tip triggered getdata for unprocessed block")
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# 7. Send the missing block for the third time (now it is requested)
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test_node.send_message(msg_block(blocks_h2f[0]))
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test_node.sync_with_ping()
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assert_equal(self.nodes[0].getblockcount(), 290)
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self.log.info("Successfully reorged to longer chain from non-whitelisted peer")
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[ c.disconnect_node() for c in connections ]
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if __name__ == '__main__':
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AcceptBlockTest().main()
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