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77 lines
2.8 KiB
77 lines
2.8 KiB
3 years ago
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#!/usr/bin/env python3
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# Copyright (c) 2020 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 per-peer message capture capability.
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Additionally, the output of contrib/message-capture/message-capture-parser.py should be verified manually.
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"""
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import glob
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from io import BytesIO
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import os
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from test_framework.p2p import P2PDataStore, MESSAGEMAP
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import assert_equal
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TIME_SIZE = 8
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LENGTH_SIZE = 4
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MSGTYPE_SIZE = 12
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def mini_parser(dat_file):
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"""Parse a data file created by CaptureMessage.
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From the data file we'll only check the structure.
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We won't care about things like:
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- Deserializing the payload of the message
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- This is managed by the deserialize methods in test_framework.messages
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- The order of the messages
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- There's no reason why we can't, say, change the order of the messages in the handshake
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- Message Type
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- We can add new message types
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We're ignoring these because they're simply too brittle to test here.
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"""
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with open(dat_file, 'rb') as f_in:
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# This should have at least one message in it
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assert(os.fstat(f_in.fileno()).st_size >= TIME_SIZE + LENGTH_SIZE + MSGTYPE_SIZE)
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while True:
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tmp_header_raw = f_in.read(TIME_SIZE + LENGTH_SIZE + MSGTYPE_SIZE)
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if not tmp_header_raw:
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break
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tmp_header = BytesIO(tmp_header_raw)
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tmp_header.read(TIME_SIZE) # skip the timestamp field
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raw_msgtype = tmp_header.read(MSGTYPE_SIZE)
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msgtype: bytes = raw_msgtype.split(b'\x00', 1)[0]
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remainder = raw_msgtype.split(b'\x00', 1)[1]
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assert(len(msgtype) > 0)
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assert(msgtype in MESSAGEMAP)
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assert(len(remainder) == 0 or not remainder.decode().isprintable())
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length: int = int.from_bytes(tmp_header.read(LENGTH_SIZE), "little")
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data = f_in.read(length)
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assert_equal(len(data), length)
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class MessageCaptureTest(BitcoinTestFramework):
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def set_test_params(self):
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self.num_nodes = 1
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self.extra_args = [["-capturemessages"]]
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self.setup_clean_chain = True
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def run_test(self):
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capturedir = os.path.join(self.nodes[0].datadir, "regtest/message_capture")
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# Connect a node so that the handshake occurs
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self.nodes[0].add_p2p_connection(P2PDataStore())
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self.nodes[0].disconnect_p2ps()
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recv_file = glob.glob(os.path.join(capturedir, "*/msgs_recv.dat"))[0]
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mini_parser(recv_file)
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sent_file = glob.glob(os.path.join(capturedir, "*/msgs_sent.dat"))[0]
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mini_parser(sent_file)
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if __name__ == '__main__':
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MessageCaptureTest().main()
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