Moduled Firegex, Merging pt1 (not finished and not working yet)
This commit is contained in:
DomySh
196
backend/modules/regexproxy/utils.py
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196
backend/modules/regexproxy/utils.py
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import secrets
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from modules.regexproxy.proxy import Filter, Proxy
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import random, socket, asyncio
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from base64 import b64decode
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from utils.sqlite import SQLite
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class STATUS:
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WAIT = "wait"
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STOP = "stop"
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PAUSE = "pause"
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ACTIVE = "active"
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class ServiceNotFoundException(Exception): pass
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class ServiceManager:
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def __init__(self, id, db):
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self.id = id
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self.db = db
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self.proxy = Proxy(
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internal_host="127.0.0.1",
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callback_blocked_update=self._stats_updater
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)
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self.status = STATUS.STOP
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self.wanted_status = STATUS.STOP
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self.filters = {}
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self._update_port_from_db()
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self._update_filters_from_db()
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self.lock = asyncio.Lock()
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self.starter = None
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def _update_port_from_db(self):
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res = self.db.query("""
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SELECT
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public_port,
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internal_port
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FROM services WHERE service_id = ?;
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""", self.id)
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if len(res) == 0: raise ServiceNotFoundException()
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self.proxy.internal_port = res[0]["internal_port"]
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self.proxy.public_port = res[0]["public_port"]
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def _update_filters_from_db(self):
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res = self.db.query("""
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SELECT
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regex, mode, regex_id `id`, is_blacklist,
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blocked_packets n_packets, is_case_sensitive
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FROM regexes WHERE service_id = ? AND active=1;
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""", self.id)
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#Filter check
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old_filters = set(self.filters.keys())
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new_filters = set([f["id"] for f in res])
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#remove old filters
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for f in old_filters:
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if not f in new_filters:
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del self.filters[f]
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for f in new_filters:
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if not f in old_filters:
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filter_info = [ele for ele in res if ele["id"] == f][0]
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self.filters[f] = Filter(
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is_case_sensitive=filter_info["is_case_sensitive"],
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c_to_s=filter_info["mode"] in ["C","B"],
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s_to_c=filter_info["mode"] in ["S","B"],
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is_blacklist=filter_info["is_blacklist"],
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regex=b64decode(filter_info["regex"]),
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blocked_packets=filter_info["n_packets"],
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code=f
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)
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self.proxy.filters = list(self.filters.values())
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def __update_status_db(self, status):
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self.db.query("UPDATE services SET status = ? WHERE service_id = ?;", status, self.id)
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async def next(self,to):
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async with self.lock:
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return await self._next(to)
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async def _next(self, to):
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if self.status != to:
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# ACTIVE -> PAUSE or PAUSE -> ACTIVE
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if (self.status, to) in [(STATUS.ACTIVE, STATUS.PAUSE)]:
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await self.proxy.pause()
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self._set_status(to)
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elif (self.status, to) in [(STATUS.PAUSE, STATUS.ACTIVE)]:
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await self.proxy.reload()
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self._set_status(to)
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# ACTIVE -> STOP
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elif (self.status,to) in [(STATUS.ACTIVE, STATUS.STOP), (STATUS.WAIT, STATUS.STOP), (STATUS.PAUSE, STATUS.STOP)]: #Stop proxy
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if self.starter: self.starter.cancel()
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await self.proxy.stop()
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self._set_status(to)
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# STOP -> ACTIVE or STOP -> PAUSE
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elif (self.status, to) in [(STATUS.STOP, STATUS.ACTIVE), (STATUS.STOP, STATUS.PAUSE)]:
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self.wanted_status = to
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self._set_status(STATUS.WAIT)
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self.__proxy_starter(to)
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def _stats_updater(self,filter:Filter):
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self.db.query("UPDATE regexes SET blocked_packets = ? WHERE regex_id = ?;", filter.blocked, filter.code)
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async def update_port(self):
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async with self.lock:
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self._update_port_from_db()
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if self.status in [STATUS.PAUSE, STATUS.ACTIVE]:
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next_status = self.status if self.status != STATUS.WAIT else self.wanted_status
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await self._next(STATUS.STOP)
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await self._next(next_status)
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def _set_status(self,status):
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self.status = status
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self.__update_status_db(status)
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async def update_filters(self):
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async with self.lock:
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self._update_filters_from_db()
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if self.status in [STATUS.PAUSE, STATUS.ACTIVE]:
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await self.proxy.reload()
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def __proxy_starter(self,to):
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async def func():
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try:
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while True:
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if check_port_is_open(self.proxy.public_port):
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self._set_status(to)
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await self.proxy.start(in_pause=(to==STATUS.PAUSE))
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self._set_status(STATUS.STOP)
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return
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else:
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await asyncio.sleep(.5)
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except asyncio.CancelledError:
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self._set_status(STATUS.STOP)
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await self.proxy.stop()
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self.starter = asyncio.create_task(func())
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class ProxyManager:
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def __init__(self, db:SQLite):
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self.db = db
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self.proxy_table:dict = {}
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self.lock = asyncio.Lock()
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async def close(self):
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for key in list(self.proxy_table.keys()):
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await self.remove(key)
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async def remove(self,id):
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async with self.lock:
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if id in self.proxy_table:
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await self.proxy_table[id].next(STATUS.STOP)
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del self.proxy_table[id]
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async def reload(self):
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async with self.lock:
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for srv in self.db.query('SELECT service_id, status FROM services;'):
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srv_id, req_status = srv["service_id"], srv["status"]
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if srv_id in self.proxy_table:
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continue
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self.proxy_table[srv_id] = ServiceManager(srv_id,self.db)
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await self.proxy_table[srv_id].next(req_status)
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def get(self,id):
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if id in self.proxy_table:
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return self.proxy_table[id]
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else:
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raise ServiceNotFoundException()
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def check_port_is_open(port):
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try:
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sock = socket.socket()
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sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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sock.bind(('0.0.0.0',port))
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sock.close()
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return True
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except Exception:
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return False
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def gen_service_id(db):
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while True:
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res = secrets.token_hex(8)
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if len(db.query('SELECT 1 FROM services WHERE service_id = ?;', res)) == 0:
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break
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return res
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def gen_internal_port(db):
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while True:
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res = random.randint(30000, 45000)
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if len(db.query('SELECT 1 FROM services WHERE internal_port = ?;', res)) == 0:
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break
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return res
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