66 lines
2 KiB
Python
66 lines
2 KiB
Python
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import asyncio
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import atexit
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from typing import Callable
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from typing import Optional
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import fnfqueue
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from .net_queue import NetQueue
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from .utils.logger import logger
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class DrawBridge:
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def __init__(self):
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self.net_queues = []
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atexit.register(self._delete_rules)
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def add_queue(
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self,
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callback: Callable,
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queue: int = 0,
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src_ip: Optional[str] = None,
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dst_ip: Optional[str] = None,
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src_port: Optional[int] = None,
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dst_port: Optional[int] = None,
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protocol: Optional[str] = "tcp",
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override: bool = False,
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):
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try:
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new_queue = NetQueue(callback, queue, src_ip, dst_ip, src_port, dst_port, protocol, override)
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new_queue.write_rule()
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except Exception as e:
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logger.error(f"Failed to initialize NetQueue: {e}")
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raise e
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self.net_queues.append(new_queue)
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def run(self):
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asyncio.run(self.raise_bridges())
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async def _listen(self, connection, callback: Callable) -> None:
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try:
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for packet in connection:
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if asyncio.iscoroutinefunction(callback):
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packet.payload = await callback(packet.payload)
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else:
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packet.payload = callback(packet.payload)
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packet.mangle()
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except fnfqueue.BufferOverflowException:
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logger.warning("Packets arriving too quickly")
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def _delete_rules(self):
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for queue in self.net_queues:
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try:
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queue.delete_rule()
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except Exception as e:
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logger.error(f"Failed to delete rule: {e}")
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async def raise_bridges(self):
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tasks = []
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for queue in self.net_queues:
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connection = fnfqueue.Connection()
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listener = connection.bind(queue.queue)
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listener.set_mode(65535, fnfqueue.COPY_PACKET)
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task = asyncio.create_task(self._listen(connection, queue.callback))
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tasks.append(task)
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await asyncio.gather(*tasks)
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