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-rwxr-xr-xqa/rpc-tests/assumevalid.py191
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diff --git a/qa/rpc-tests/assumevalid.py b/qa/rpc-tests/assumevalid.py
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+#!/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.
+'''
+assumevalid.py
+
+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.
+'''
+
+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.key import CECKey
+from test_framework.script import *
+
+class BaseNode(SingleNodeConnCB):
+ def __init__(self):
+ SingleNodeConnCB.__init__(self)
+ self.last_inv = None
+ self.last_headers = None
+ self.last_block = None
+ self.last_getdata = None
+ self.block_announced = False
+ self.last_getheaders = None
+ self.disconnected = False
+ self.last_blockhash_announced = None
+
+ def on_close(self, conn):
+ self.disconnected = True
+
+ def wait_for_disconnect(self, timeout=60):
+ test_function = lambda: self.disconnected
+ assert(wait_until(test_function, timeout=timeout))
+ return
+
+ 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 SendHeadersTest(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 = []
+ self.nodes.append(start_node(0, self.options.tmpdir, ["-debug"]))
+
+ 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,
+ ["-debug", "-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,
+ ["-debug", "-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 102 blocks to node0. Block 102 will be rejected.
+ for i in range(101):
+ node0.send_message(msg_block(self.blocks[i]))
+ node0.sync_with_ping() # make sure the most recent block is synced
+ node0.send_message(msg_block(self.blocks[101]))
+ assert_equal(self.nodes[0].getblock(self.nodes[0].getbestblockhash())['height'], 101)
+
+ # Send 3102 blocks to node1. All blocks will be accepted.
+ for i in range(2202):
+ node1.send_message(msg_block(self.blocks[i]))
+ node1.sync_with_ping() # make sure the most recent block is synced
+ assert_equal(self.nodes[1].getblock(self.nodes[1].getbestblockhash())['height'], 2202)
+
+ # Send 102 blocks to node2. Block 102 will be rejected.
+ for i in range(101):
+ node2.send_message(msg_block(self.blocks[i]))
+ node2.sync_with_ping() # make sure the most recent block is synced
+ node2.send_message(msg_block(self.blocks[101]))
+ assert_equal(self.nodes[2].getblock(self.nodes[2].getbestblockhash())['height'], 101)
+
+if __name__ == '__main__':
+ SendHeadersTest().main()