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Check prior header hashes to detect forks

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This commit is contained in:
Neil Booth 2017-07-30 21:32:41 +09:00
parent f696a7933d
commit 75feac5d1e
1 changed files with 31 additions and 4 deletions
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35
server/peers.py
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@ -83,7 +83,7 @@ class PeerSession(JSONSession):
self.send_request(self.on_version, 'server.version',
[version.VERSION, proto_ver])
self.send_request(self.on_features, 'server.features')
self.send_request(self.on_headers, 'blockchain.headers.subscribe')
self.send_request(self.on_height, 'blockchain.headers.subscribe')
self.send_request(self.on_peers_subscribe, 'server.peers.subscribe')
def connection_lost(self, exc):
@ -123,8 +123,8 @@ class PeerSession(JSONSession):
.format(hosts))
self.close_if_done()
def on_headers(self, result, error):
'''Handle the response to the version message.'''
def on_height(self, result, error):
'''Handle the response to blockchain.headers.subscribe message.'''
if error:
self.failed = True
self.log_error('blockchain.headers.subscribe returned an error')
@ -132,7 +132,8 @@ class PeerSession(JSONSession):
self.bad = True
self.log_error('bad blockchain.headers.subscribe response')
else:
our_height = self.peer_mgr.controller.bp.db_height
controller = self.peer_mgr.controller
our_height = controller.bp.db_height
their_height = result.get('block_height')
if not isinstance(their_height, int):
self.log_warning('invalid height {}'.format(their_height))
@ -141,6 +142,32 @@ class PeerSession(JSONSession):
self.log_warning('bad height {:,d} (ours: {:,d})'
.format(their_height, our_height))
self.bad = True
# Check prior header too in case of hard fork.
if not self.bad:
check_height = min(our_height, their_height)
self.send_request(self.on_header, 'blockchain.block.get_header',
[check_height])
self.expected_header = controller.electrum_header(check_height)
self.close_if_done()
def on_header(self, result, error):
'''Handle the response to blockchain.block.get_header message.
Compare hashes of prior header in attempt to determine if forked.'''
if error:
self.failed = True
self.log_error('blockchain.block.get_header returned an error')
elif not isinstance(result, dict):
self.bad = True
self.log_error('bad blockchain.block.get_header response')
else:
theirs = result.get('prev_block_hash')
ours = self.expected_header.get('prev_block_hash')
if ours != theirs:
self.log_error('our header hash {} and theirs {} differ'
.format(ours, theirs))
self.bad = True
self.close_if_done()
def on_version(self, result, error):