241 lines
6.5 KiB
Python
241 lines
6.5 KiB
Python
"""
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MemeD - the MEMEwork Daemon
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- This program manages the memework vps'
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command logging
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"""
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import asyncio
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import struct
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import json
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import logging
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import sys
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import asyncpg
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import config
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from bot import schedule_bot
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logging.basicConfig(level=logging.DEBUG)
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log = logging.getLogger(__name__)
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# globals are bad, but who cares
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db = None
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bot = None
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# for writer:
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# - op 0 : hello
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# - op 1 : request response
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# for reader:
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# - op 1 : log
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# - op 2 : rsudo
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# - op 3 : rsudo with steroids
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async def wrap(coro):
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try:
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await coro()
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except ConnectionError as err:
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log.warning(f'connection err: {err!r}')
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except Exception:
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log.exception('error inside wrapped')
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def parse_logstr(string):
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# '2015-02-11T19:05:10+00:00 labrat-1 snoopy[896]: [uid:0 sid:11679
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# tty:/dev/pts/2 cwd:/root filename:/usr/bin/cat]: cat /etc/fstab.BAK'
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# I really need to parse the uid, cwd and the command out of that.
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# '[uid:123 sid:440 tty:/dev/pts/4 cwd:/root filename:/bin/chmod]: AAAA BBBBBB CCCCCCCC'
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# THIS IS WHAT WE PARSE NOW.
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splitted = string.split(':')
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command = splitted[-1].strip()
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k = string.find('[')
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important = string[k:]
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lst = important.replace('[', '').replace(']', '').split()
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# filder uid and cwd
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spl = [s.split(':') for s in lst if 'uid' in s or 'cwd' in s]
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uid = [e[1] for e in spl if e[0] == 'uid'][0]
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cwd = [e[1] for e in spl if e[0] == 'cwd'][0]
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return int(uid), cwd, command
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class MemeClient:
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"""MemeD client handler."""
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def __init__(self, reader, writer):
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self.reader = reader
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self.writer = writer
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self.loop = asyncio.get_event_loop()
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async def read_msg(self) -> str:
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"""Read one message from the socket."""
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header = await self.reader.read(8)
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log.debug('[recv] %r', header)
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length, opcode = struct.unpack('Ii', header)
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data = await self.reader.read(length)
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data = data.decode()
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log.debug('[recv] %d %d %s', length, opcode, data)
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return opcode, data
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async def read_payload(self) -> dict:
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"""Read a payload from the socket."""
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opcode, message = await self.read_msg()
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# NOTE: this is kinda unused
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if opcode > 10:
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return opcode, json.loads(message)
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return opcode, message
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async def send_msg(self, op: int, data: str):
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"""Send a message.
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This does not wait for the receiving end
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to properly flush their buffers.
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Arguments
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---------
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op: int
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OP code to be sent.
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data: str
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Message to be sent with the op code.
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"""
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# create header, pack message, yadda yadda
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header = struct.pack('Ii', len(data), op).decode()
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msg = f'{header}{data}'.encode()
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log.debug('[send] %d, %s -> %r', op, data, msg)
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self.writer.write(msg)
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# clients can close this early
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# and make writer.drain kill itself
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# so we wrap on a task which is isolated
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asyncio.get_event_loop().create_task(wrap(self.writer.drain))
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async def process(self, op: int, message: str) -> 'None':
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"""Process a message given through the socket"""
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handler = getattr(self, f'handle_{op}', None)
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if not handler:
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# Ignore unknown OP codes.
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return
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await handler(message)
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async def handle_1(self, message: str):
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global db
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uid, cwd, command = parse_logstr(message)
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log.info('[process] Logging command '
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f'uid={uid} cwd={cwd} cmd={command}')
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await db.execute("""
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INSERT INTO logs (uid, cwd, cmd) VALUES ($1, $2, $3)
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""", uid, cwd, command)
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async def handle_2(self, message: str):
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"""Handle an OP 2 packet.
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This is the RSudo handling, but without waiting for
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the approval of a mod (the 'nowait' behavior).
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"""
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if not bot:
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return await self.send_msg(1, 'no bot up')
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rsudo = bot.get_cog('Rsudo')
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if not rsudo:
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return await self.send_msg(1, 'no rsudo cog')
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log.info('[rsudo:nowait] %r', message)
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# this doesnt wait for the thing
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self.loop.create_task(rsudo.request(message))
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return await self.send_msg(1, "true")
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async def handle_3(self, message: str):
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"""Handle an OP 3 packet.
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This follows the same logic as OP 2, however
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the client gets a response back, a string ('true' or 'false'),
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depending on the request.
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NO COMMANDS WILL BE EXECUTED SERVER-SIDE FROM THIS OP.
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"""
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if not bot:
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return await self.send_msg(1, 'no bot started')
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rsudo = bot.get_cog('Rsudo')
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if not rsudo:
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return await self.send_msg(1, 'no rsudo cog')
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log.info('[rsudo:wait] %r', message)
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success = await rsudo.request(message, True)
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# the original idea was sending an int back
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# but we had no idea how to do that since
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# we were already working with strings all the time
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# so yeah, this is *another* string
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ok_str = 'true' if success else 'false'
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return await self.send_msg(1, ok_str)
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async def client_loop(self):
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"""Enter a loop waiting for messages from the client."""
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try:
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while True:
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op, message = await self.read_msg()
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await self.process(op, message)
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except ConnectionError as e:
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log.warning('conn err: %r', e)
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except Exception:
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log.exception('error at loop')
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self.writer.close()
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async def handle_client(reader, writer):
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"""Handle clients coming in the socket, spawn a loop for them."""
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client = MemeClient(reader, writer)
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await client.send_msg(0, 'hello')
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await client.client_loop()
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def main():
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# YES GLOBALS ARE BAD I KNOW
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global bot
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global db
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loop = asyncio.get_event_loop()
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coro = asyncio.start_unix_server(handle_client, sys.argv[1],
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loop=loop)
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pool = loop.run_until_complete(asyncpg.create_pool(**config.db))
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db = pool
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server = loop.run_until_complete(coro)
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if config.bot_token:
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bot = schedule_bot(loop, config, pool)
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if bot:
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loop.create_task(bot.start(config.bot_token))
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log.info(f'memed serving at {server.sockets[0].getsockname()}')
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try:
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loop.run_forever()
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finally:
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log.info('Closing server')
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server.close()
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loop.run_until_complete(server.wait_closed())
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loop.close()
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if __name__ == '__main__':
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main()
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