aboutsummaryrefslogtreecommitdiff
path: root/test/functional/assumevalid.py
diff options
context:
space:
mode:
Diffstat (limited to 'test/functional/assumevalid.py')
-rwxr-xr-xtest/functional/assumevalid.py202
1 files changed, 202 insertions, 0 deletions
diff --git a/test/functional/assumevalid.py b/test/functional/assumevalid.py
new file mode 100755
index 0000000000..8e301c4379
--- /dev/null
+++ b/test/functional/assumevalid.py
@@ -0,0 +1,202 @@
+#!/usr/bin/env python3
+# Copyright (c) 2014-2016 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test logic for skipping signature validation on old blocks.
+
+Test logic for skipping signature validation on blocks which we've assumed
+valid (https://github.com/bitcoin/bitcoin/pull/9484)
+
+We build a chain that includes and invalid signature for one of the
+transactions:
+
+ 0: genesis block
+ 1: block 1 with coinbase transaction output.
+ 2-101: bury that block with 100 blocks so the coinbase transaction
+ output can be spent
+ 102: a block containing a transaction spending the coinbase
+ transaction output. The transaction has an invalid signature.
+ 103-2202: bury the bad block with just over two weeks' worth of blocks
+ (2100 blocks)
+
+Start three nodes:
+
+ - node0 has no -assumevalid parameter. Try to sync to block 2202. It will
+ reject block 102 and only sync as far as block 101
+ - node1 has -assumevalid set to the hash of block 102. Try to sync to
+ block 2202. node1 will sync all the way to block 2202.
+ - node2 has -assumevalid set to the hash of block 102. Try to sync to
+ block 200. node2 will reject block 102 since it's assumed valid, but it
+ isn't buried by at least two weeks' work.
+"""
+import time
+
+from test_framework.blocktools import (create_block, create_coinbase)
+from test_framework.key import CECKey
+from test_framework.mininode import (CBlockHeader,
+ COutPoint,
+ CTransaction,
+ CTxIn,
+ CTxOut,
+ NetworkThread,
+ NodeConn,
+ NodeConnCB,
+ msg_block,
+ msg_headers)
+from test_framework.script import (CScript, OP_TRUE)
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import (start_node, p2p_port, assert_equal)
+
+class BaseNode(NodeConnCB):
+ 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 AssumeValidTest(BitcoinTestFramework):
+ def __init__(self):
+ super().__init__()
+ self.setup_clean_chain = True
+ self.num_nodes = 3
+
+ def setup_network(self):
+ # Start node0. We don't start the other nodes yet since
+ # we need to pre-mine a block with an invalid transaction
+ # signature so we can pass in the block hash as assumevalid.
+ self.nodes = [start_node(0, self.options.tmpdir)]
+
+ def send_blocks_until_disconnected(self, node):
+ """Keep sending blocks to the node until we're disconnected."""
+ for i in range(len(self.blocks)):
+ try:
+ node.send_message(msg_block(self.blocks[i]))
+ except IOError as e:
+ assert str(e) == 'Not connected, no pushbuf'
+ break
+
+ def assert_blockchain_height(self, node, height):
+ """Wait until the blockchain is no longer advancing and verify it's reached the expected height."""
+ last_height = node.getblock(node.getbestblockhash())['height']
+ timeout = 10
+ while True:
+ time.sleep(0.25)
+ current_height = node.getblock(node.getbestblockhash())['height']
+ if current_height != last_height:
+ last_height = current_height
+ if timeout < 0:
+ assert False, "blockchain too short after timeout: %d" % current_height
+ timeout - 0.25
+ continue
+ elif current_height > height:
+ assert False, "blockchain too long: %d" % current_height
+ elif current_height == height:
+ break
+
+ def run_test(self):
+
+ # Connect to node0
+ node0 = BaseNode()
+ connections = []
+ connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], node0))
+ node0.add_connection(connections[0])
+
+ NetworkThread().start() # Start up network handling in another thread
+ node0.wait_for_verack()
+
+ # Build the blockchain
+ self.tip = int(self.nodes[0].getbestblockhash(), 16)
+ self.block_time = self.nodes[0].getblock(self.nodes[0].getbestblockhash())['time'] + 1
+
+ self.blocks = []
+
+ # Get a pubkey for the coinbase TXO
+ coinbase_key = CECKey()
+ coinbase_key.set_secretbytes(b"horsebattery")
+ coinbase_pubkey = coinbase_key.get_pubkey()
+
+ # Create the first block with a coinbase output to our key
+ height = 1
+ block = create_block(self.tip, create_coinbase(height, coinbase_pubkey), self.block_time)
+ self.blocks.append(block)
+ self.block_time += 1
+ block.solve()
+ # Save the coinbase for later
+ self.block1 = block
+ self.tip = block.sha256
+ height += 1
+
+ # Bury the block 100 deep so the coinbase output is spendable
+ for i in range(100):
+ block = create_block(self.tip, create_coinbase(height), self.block_time)
+ block.solve()
+ self.blocks.append(block)
+ self.tip = block.sha256
+ self.block_time += 1
+ height += 1
+
+ # Create a transaction spending the coinbase output with an invalid (null) signature
+ tx = CTransaction()
+ tx.vin.append(CTxIn(COutPoint(self.block1.vtx[0].sha256, 0), scriptSig=b""))
+ tx.vout.append(CTxOut(49 * 100000000, CScript([OP_TRUE])))
+ tx.calc_sha256()
+
+ block102 = create_block(self.tip, create_coinbase(height), self.block_time)
+ self.block_time += 1
+ block102.vtx.extend([tx])
+ block102.hashMerkleRoot = block102.calc_merkle_root()
+ block102.rehash()
+ block102.solve()
+ self.blocks.append(block102)
+ self.tip = block102.sha256
+ self.block_time += 1
+ height += 1
+
+ # Bury the assumed valid block 2100 deep
+ for i in range(2100):
+ block = create_block(self.tip, create_coinbase(height), self.block_time)
+ block.nVersion = 4
+ block.solve()
+ self.blocks.append(block)
+ self.tip = block.sha256
+ self.block_time += 1
+ height += 1
+
+ # Start node1 and node2 with assumevalid so they accept a block with a bad signature.
+ self.nodes.append(start_node(1, self.options.tmpdir,
+ ["-assumevalid=" + hex(block102.sha256)]))
+ node1 = BaseNode() # connects to node1
+ connections.append(NodeConn('127.0.0.1', p2p_port(1), self.nodes[1], node1))
+ node1.add_connection(connections[1])
+ node1.wait_for_verack()
+
+ self.nodes.append(start_node(2, self.options.tmpdir,
+ ["-assumevalid=" + hex(block102.sha256)]))
+ node2 = BaseNode() # connects to node2
+ connections.append(NodeConn('127.0.0.1', p2p_port(2), self.nodes[2], node2))
+ node2.add_connection(connections[2])
+ node2.wait_for_verack()
+
+ # send header lists to all three nodes
+ node0.send_header_for_blocks(self.blocks[0:2000])
+ node0.send_header_for_blocks(self.blocks[2000:])
+ node1.send_header_for_blocks(self.blocks[0:2000])
+ node1.send_header_for_blocks(self.blocks[2000:])
+ node2.send_header_for_blocks(self.blocks[0:200])
+
+ # Send blocks to node0. Block 102 will be rejected.
+ self.send_blocks_until_disconnected(node0)
+ self.assert_blockchain_height(self.nodes[0], 101)
+
+ # Send all blocks to node1. All blocks will be accepted.
+ for i in range(2202):
+ node1.send_message(msg_block(self.blocks[i]))
+ # Syncing 2200 blocks can take a while on slow systems. Give it plenty of time to sync.
+ node1.sync_with_ping(120)
+ assert_equal(self.nodes[1].getblock(self.nodes[1].getbestblockhash())['height'], 2202)
+
+ # Send blocks to node2. Block 102 will be rejected.
+ self.send_blocks_until_disconnected(node2)
+ self.assert_blockchain_height(self.nodes[2], 101)
+
+if __name__ == '__main__':
+ AssumeValidTest().main()