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Diffstat (limited to 'contrib/message-capture')
| -rw-r--r-- | contrib/message-capture/message-capture-docs.md | 25 | ||||
| -rwxr-xr-x | contrib/message-capture/message-capture-parser.py | 214 |
2 files changed, 239 insertions, 0 deletions
diff --git a/contrib/message-capture/message-capture-docs.md b/contrib/message-capture/message-capture-docs.md new file mode 100644 index 0000000000..7301968461 --- /dev/null +++ b/contrib/message-capture/message-capture-docs.md @@ -0,0 +1,25 @@ +# Per-Peer Message Capture + +## Purpose + +This feature allows for message capture on a per-peer basis. It answers the simple question: "Can I see what messages my node is sending and receiving?" + +## Usage and Functionality + +* Run `bitcoind` with the `-capturemessages` option. +* Look in the `message_capture` folder in your datadir. + * Typically this will be `~/.bitcoin/message_capture`. + * See that there are many folders inside, one for each peer names with its IP address and port. + * Inside each peer's folder there are two `.dat` files: one is for received messages (`msgs_recv.dat`) and the other is for sent messages (`msgs_sent.dat`). +* Run `contrib/message-capture/message-capture-parser.py` with the proper arguments. + * See the `-h` option for help. + * To see all messages, both sent and received, for all peers use: + ``` + ./contrib/message-capture/message-capture-parser.py -o out.json \ + ~/.bitcoin/message_capture/**/*.dat + ``` + * Note: The messages in the given `.dat` files will be interleaved in chronological order. So, giving both received and sent `.dat` files (as above with `*.dat`) will result in all messages being interleaved in chronological order. + * If an output file is not provided (i.e. the `-o` option is not used), then the output prints to `stdout`. +* View the resulting output. + * The output file is `JSON` formatted. + * Suggestion: use `jq` to view the output, with `jq . out.json` diff --git a/contrib/message-capture/message-capture-parser.py b/contrib/message-capture/message-capture-parser.py new file mode 100755 index 0000000000..9988478f1b --- /dev/null +++ b/contrib/message-capture/message-capture-parser.py @@ -0,0 +1,214 @@ +#!/usr/bin/env python3 +# Copyright (c) 2020 The Bitcoin Core developers +# Distributed under the MIT software license, see the accompanying +# file COPYING or http://www.opensource.org/licenses/mit-license.php. +"""Parse message capture binary files. To be used in conjunction with -capturemessages.""" + +import argparse +import os +import shutil +import sys +from io import BytesIO +import json +from pathlib import Path +from typing import Any, List, Optional + +sys.path.append(os.path.join(os.path.dirname(__file__), '../../test/functional')) + +from test_framework.messages import ser_uint256 # noqa: E402 +from test_framework.p2p import MESSAGEMAP # noqa: E402 + +TIME_SIZE = 8 +LENGTH_SIZE = 4 +MSGTYPE_SIZE = 12 + +# The test framework classes stores hashes as large ints in many cases. +# These are variables of type uint256 in core. +# There isn't a way to distinguish between a large int and a large int that is actually a blob of bytes. +# As such, they are itemized here. +# Any variables with these names that are of type int are actually uint256 variables. +# (These can be easily found by looking for calls to deser_uint256, deser_uint256_vector, and uint256_from_str in messages.py) +HASH_INTS = [ + "blockhash", + "block_hash", + "hash", + "hashMerkleRoot", + "hashPrevBlock", + "hashstop", + "prev_header", + "sha256", + "stop_hash", +] + +HASH_INT_VECTORS = [ + "hashes", + "headers", + "vHave", + "vHash", +] + + +class ProgressBar: + def __init__(self, total: float): + self.total = total + self.running = 0 + + def set_progress(self, progress: float): + cols = shutil.get_terminal_size()[0] + if cols <= 12: + return + max_blocks = cols - 9 + num_blocks = int(max_blocks * progress) + print('\r[ {}{} ] {:3.0f}%' + .format('#' * num_blocks, + ' ' * (max_blocks - num_blocks), + progress * 100), + end ='') + + def update(self, more: float): + self.running += more + self.set_progress(self.running / self.total) + + +def to_jsonable(obj: Any) -> Any: + if hasattr(obj, "__dict__"): + return obj.__dict__ + elif hasattr(obj, "__slots__"): + ret = {} # type: Any + for slot in obj.__slots__: + val = getattr(obj, slot, None) + if slot in HASH_INTS and isinstance(val, int): + ret[slot] = ser_uint256(val).hex() + elif slot in HASH_INT_VECTORS and isinstance(val[0], int): + ret[slot] = [ser_uint256(a).hex() for a in val] + else: + ret[slot] = to_jsonable(val) + return ret + elif isinstance(obj, list): + return [to_jsonable(a) for a in obj] + elif isinstance(obj, bytes): + return obj.hex() + else: + return obj + + +def process_file(path: str, messages: List[Any], recv: bool, progress_bar: Optional[ProgressBar]) -> None: + with open(path, 'rb') as f_in: + if progress_bar: + bytes_read = 0 + + while True: + if progress_bar: + # Update progress bar + diff = f_in.tell() - bytes_read - 1 + progress_bar.update(diff) + bytes_read = f_in.tell() - 1 + + # Read the Header + tmp_header_raw = f_in.read(TIME_SIZE + LENGTH_SIZE + MSGTYPE_SIZE) + if not tmp_header_raw: + break + tmp_header = BytesIO(tmp_header_raw) + time = int.from_bytes(tmp_header.read(TIME_SIZE), "little") # type: int + msgtype = tmp_header.read(MSGTYPE_SIZE).split(b'\x00', 1)[0] # type: bytes + length = int.from_bytes(tmp_header.read(LENGTH_SIZE), "little") # type: int + + # Start converting the message to a dictionary + msg_dict = {} + msg_dict["direction"] = "recv" if recv else "sent" + msg_dict["time"] = time + msg_dict["size"] = length # "size" is less readable here, but more readable in the output + + msg_ser = BytesIO(f_in.read(length)) + + # Determine message type + if msgtype not in MESSAGEMAP: + # Unrecognized message type + try: + msgtype_tmp = msgtype.decode() + if not msgtype_tmp.isprintable(): + raise UnicodeDecodeError + msg_dict["msgtype"] = msgtype_tmp + except UnicodeDecodeError: + msg_dict["msgtype"] = "UNREADABLE" + msg_dict["body"] = msg_ser.read().hex() + msg_dict["error"] = "Unrecognized message type." + messages.append(msg_dict) + print(f"WARNING - Unrecognized message type {msgtype} in {path}", file=sys.stderr) + continue + + # Deserialize the message + msg = MESSAGEMAP[msgtype]() + msg_dict["msgtype"] = msgtype.decode() + + try: + msg.deserialize(msg_ser) + except KeyboardInterrupt: + raise + except Exception: + # Unable to deserialize message body + msg_ser.seek(0, os.SEEK_SET) + msg_dict["body"] = msg_ser.read().hex() + msg_dict["error"] = "Unable to deserialize message." + messages.append(msg_dict) + print(f"WARNING - Unable to deserialize message in {path}", file=sys.stderr) + continue + + # Convert body of message into a jsonable object + if length: + msg_dict["body"] = to_jsonable(msg) + messages.append(msg_dict) + + if progress_bar: + # Update the progress bar to the end of the current file + # in case we exited the loop early + f_in.seek(0, os.SEEK_END) # Go to end of file + diff = f_in.tell() - bytes_read - 1 + progress_bar.update(diff) + + +def main(): + parser = argparse.ArgumentParser( + description=__doc__, + epilog="EXAMPLE \n\t{0} -o out.json <data-dir>/message_capture/**/*.dat".format(sys.argv[0]), + formatter_class=argparse.RawTextHelpFormatter) + parser.add_argument( + "capturepaths", + nargs='+', + help="binary message capture files to parse.") + parser.add_argument( + "-o", "--output", + help="output file. If unset print to stdout") + parser.add_argument( + "-n", "--no-progress-bar", + action='store_true', + help="disable the progress bar. Automatically set if the output is not a terminal") + args = parser.parse_args() + capturepaths = [Path.cwd() / Path(capturepath) for capturepath in args.capturepaths] + output = Path.cwd() / Path(args.output) if args.output else False + use_progress_bar = (not args.no_progress_bar) and sys.stdout.isatty() + + messages = [] # type: List[Any] + if use_progress_bar: + total_size = sum(capture.stat().st_size for capture in capturepaths) + progress_bar = ProgressBar(total_size) + else: + progress_bar = None + + for capture in capturepaths: + process_file(str(capture), messages, "recv" in capture.stem, progress_bar) + + messages.sort(key=lambda msg: msg['time']) + + if use_progress_bar: + progress_bar.set_progress(1) + + jsonrep = json.dumps(messages) + if output: + with open(str(output), 'w+', encoding="utf8") as f_out: + f_out.write(jsonrep) + else: + print(jsonrep) + +if __name__ == "__main__": + main() |