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Merge bitcoin#30657: test: add functional test for XORed block/undo f…
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…iles (`-blocksxor` option)

faa1b9b test: add functional test for XORed block/undo files (`-blocksxor`) (Sebastian Falbesoner)
6b3676b test: refactor: move `read_xor_key`/`util_xor` helpers to util module (Sebastian Falbesoner)

Pull request description:

  This PR adds a dedicated functional test for XORed block data/undo file support (bitcoind option `-blocksxor`, see PR bitcoin#28052). In order to verify that the XOR pattern has been applied, the {blk,rev}*.dat files are rewritten un-XORed manually by the test while the node is shut down; the node is then started again with `-blocksxor=0`, and both the data and undo files are verified via the `verifychain` RPC (with checklevel=2). Note that starting bitcoind with `-blocksxor=0` fails if a xor key is present already, which is also tested explicitly.

  Fixes bitcoin#30599.

ACKs for top commit:
  glozow:
    ACK faa1b9b
  maflcko:
    ACK faa1b9b
  ismaelsadeeq:
    Tested ACK faa1b9b

Tree-SHA512: e1df106f6b4e3ba67eca108e36d762f1b991673b881934b84cd36946496a09ce9c329c1363c36aa29409137ae4881e2d177e651359686511632ddf2870f7ca8e
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glozow committed Aug 16, 2024
2 parents 99ecb9a + faa1b9b commit 6474132
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65 changes: 65 additions & 0 deletions test/functional/feature_blocksxor.py
Original file line number Diff line number Diff line change
@@ -0,0 +1,65 @@
#!/usr/bin/env python3
# Copyright (c) 2024 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 support for XORed block data and undo files (`-blocksxor` option)."""
import os

from test_framework.test_framework import BitcoinTestFramework
from test_framework.test_node import ErrorMatch
from test_framework.util import (
assert_equal,
assert_greater_than,
read_xor_key,
util_xor,
)
from test_framework.wallet import MiniWallet


class BlocksXORTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
self.extra_args = [[
'-blocksxor=1',
'-fastprune=1', # use smaller block files
'-datacarriersize=100000', # needed to pad transaction with MiniWallet
]]

def run_test(self):
self.log.info("Mine some blocks, to create multiple blk*.dat/rev*.dat files")
node = self.nodes[0]
wallet = MiniWallet(node)
for _ in range(5):
wallet.send_self_transfer(from_node=node, target_weight=80000)
self.generate(wallet, 1)

block_files = list(node.blocks_path.glob('blk[0-9][0-9][0-9][0-9][0-9].dat'))
undo_files = list(node.blocks_path.glob('rev[0-9][0-9][0-9][0-9][0-9].dat'))
assert_equal(len(block_files), len(undo_files))
assert_greater_than(len(block_files), 1) # we want at least one full block file

self.log.info("Shut down node and un-XOR block/undo files manually")
self.stop_node(0)
xor_key = read_xor_key(node=node)
for data_file in sorted(block_files + undo_files):
self.log.debug(f"Rewriting file {data_file}...")
with open(data_file, 'rb+') as f:
xored_data = f.read()
f.seek(0)
f.write(util_xor(xored_data, xor_key, offset=0))

self.log.info("Check that restarting with 'blocksxor=0' fails if XOR key is present")
node.assert_start_raises_init_error(['-blocksxor=0'],
'The blocksdir XOR-key can not be disabled when a random key was already stored!',
match=ErrorMatch.PARTIAL_REGEX)

self.log.info("Delete XOR key, restart node with '-blocksxor=0', check blk*.dat/rev*.dat file integrity")
os.remove(node.blocks_path / 'xor.dat')
self.start_node(0, extra_args=['-blocksxor=0'])
# checklevel=2 -> verify block validity + undo data
# nblocks=0 -> verify all blocks
node.verifychain(checklevel=2, nblocks=0)


if __name__ == '__main__':
BlocksXORTest(__file__).main()
16 changes: 6 additions & 10 deletions test/functional/feature_reindex.py
Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,11 @@

from test_framework.test_framework import BitcoinTestFramework
from test_framework.messages import MAGIC_BYTES
from test_framework.util import assert_equal
from test_framework.util import (
assert_equal,
read_xor_key,
util_xor,
)


class ReindexTest(BitcoinTestFramework):
Expand All @@ -39,15 +43,7 @@ def out_of_order(self):
# we're generating them rather than getting them from peers), so to
# test out-of-order handling, swap blocks 1 and 2 on disk.
blk0 = self.nodes[0].blocks_path / "blk00000.dat"
with open(self.nodes[0].blocks_path / "xor.dat", "rb") as xor_f:
NUM_XOR_BYTES = 8 # From InitBlocksdirXorKey::xor_key.size()
xor_dat = xor_f.read(NUM_XOR_BYTES)

def util_xor(data, key, *, offset):
data = bytearray(data)
for i in range(len(data)):
data[i] ^= key[(i + offset) % len(key)]
return bytes(data)
xor_dat = read_xor_key(node=self.nodes[0])

with open(blk0, 'r+b') as bf:
# Read at least the first few blocks (including genesis)
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13 changes: 13 additions & 0 deletions test/functional/test_framework/util.py
Original file line number Diff line number Diff line change
Expand Up @@ -311,6 +311,13 @@ def sha256sum_file(filename):
return h.digest()


def util_xor(data, key, *, offset):
data = bytearray(data)
for i in range(len(data)):
data[i] ^= key[(i + offset) % len(key)]
return bytes(data)


# RPC/P2P connection constants and functions
############################################

Expand Down Expand Up @@ -508,6 +515,12 @@ def check_node_connections(*, node, num_in, num_out):
assert_equal(info["connections_out"], num_out)


def read_xor_key(*, node):
with open(node.blocks_path / "xor.dat", "rb") as xor_f:
NUM_XOR_BYTES = 8 # From InitBlocksdirXorKey::xor_key.size()
return xor_f.read(NUM_XOR_BYTES)


# Transaction/Block functions
#############################

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1 change: 1 addition & 0 deletions test/functional/test_runner.py
Original file line number Diff line number Diff line change
Expand Up @@ -284,6 +284,7 @@
'mempool_package_limits.py',
'mempool_package_rbf.py',
'feature_versionbits_warning.py',
'feature_blocksxor.py',
'rpc_preciousblock.py',
'wallet_importprunedfunds.py --legacy-wallet',
'wallet_importprunedfunds.py --descriptors',
Expand Down

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