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58 lines
1.9 KiB
Python
58 lines
1.9 KiB
Python
# servprotect.py: Protects against KILL and nick collision floods
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import threading
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from pylinkirc import conf, utils
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from pylinkirc.log import log
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try:
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from cachetools import TTLCache
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except ImportError:
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log.warning('servprotect: expiringdict support is deprecated as of PyLink 2.1; consider installing cachetools instead')
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from expiringdict import ExpiringDict as TTLCache
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# check for definitions
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servprotect_conf = conf.conf.get('servprotect', {})
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length = servprotect_conf.get('length', 10)
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age = servprotect_conf.get('age', 10)
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def _new_cache_dict():
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return TTLCache(length, age)
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savecache = _new_cache_dict()
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killcache = _new_cache_dict()
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lock = threading.Lock()
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def handle_kill(irc, numeric, command, args):
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"""
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Tracks kills against PyLink clients. If too many are received,
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automatically disconnects from the network.
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"""
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if (args['userdata'] and irc.is_internal_server(args['userdata'].server)) or irc.is_internal_client(args['target']):
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with lock:
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if killcache.setdefault(irc.name, 1) >= length:
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log.error('(%s) servprotect: Too many kills received, aborting!', irc.name)
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irc.disconnect()
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log.debug('(%s) servprotect: Incrementing killcache by 1', irc.name)
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killcache[irc.name] += 1
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utils.add_hook(handle_kill, 'KILL')
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def handle_save(irc, numeric, command, args):
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"""
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Tracks SAVEs (nick collision) against PyLink clients. If too many are received,
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automatically disconnects from the network.
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"""
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if irc.is_internal_client(args['target']):
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with lock:
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if savecache.setdefault(irc.name, 0) >= length:
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log.error('(%s) servprotect: Too many nick collisions, aborting!', irc.name)
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irc.disconnect()
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log.debug('(%s) servprotect: Incrementing savecache by 1', irc.name)
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savecache[irc.name] += 1
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utils.add_hook(handle_save, 'SAVE')
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