121 lines
3.7 KiB
Python
121 lines
3.7 KiB
Python
# Copyright (C) 2013 Nippon Telegraph and Telephone Corporation.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import logging
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import six
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from os_ken.lib import hub, alert
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from os_ken.base import app_manager
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from os_ken.controller import event
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BUFSIZE = alert.AlertPkt._ALERTPKT_SIZE
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SOCKFILE = "/tmp/snort_alert"
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class EventAlert(event.EventBase):
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def __init__(self, msg):
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super(EventAlert, self).__init__()
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self.msg = msg
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class SnortLib(app_manager.RyuApp):
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def __init__(self):
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super(SnortLib, self).__init__()
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self.name = 'snortlib'
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self.config = {'unixsock': True}
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self._set_logger()
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self.sock = None
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self.nwsock = None
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def set_config(self, config):
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assert isinstance(config, dict)
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self.config = config
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def start_socket_server(self):
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if not self.config.get('unixsock'):
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if self.config.get('port') is None:
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self.config['port'] = 51234
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self._start_recv_nw_sock(self.config.get('port'))
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else:
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self._start_recv()
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self.logger.info(self.config)
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def _recv_loop(self):
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self.logger.info("Unix socket start listening...")
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while True:
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data = self.sock.recv(BUFSIZE)
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msg = alert.AlertPkt.parser(data)
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if msg:
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self.send_event_to_observers(EventAlert(msg))
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def _start_recv(self):
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if os.path.exists(SOCKFILE):
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os.unlink(SOCKFILE)
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self.sock = hub.socket.socket(hub.socket.AF_UNIX,
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hub.socket.SOCK_DGRAM)
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self.sock.bind(SOCKFILE)
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hub.spawn(self._recv_loop)
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def _start_recv_nw_sock(self, port):
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self.nwsock = hub.socket.socket(hub.socket.AF_INET,
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hub.socket.SOCK_STREAM)
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self.nwsock.setsockopt(hub.socket.SOL_SOCKET,
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hub.socket.SO_REUSEADDR, 1)
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self.nwsock.bind(('0.0.0.0', port))
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self.nwsock.listen(5)
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hub.spawn(self._accept_loop_nw_sock)
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def _accept_loop_nw_sock(self):
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self.logger.info("Network socket server start listening...")
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while True:
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conn, addr = self.nwsock.accept()
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self.logger.info("Connected with %s", addr[0])
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hub.spawn(self._recv_loop_nw_sock, conn, addr)
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def _recv_loop_nw_sock(self, conn, addr):
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buf = six.binary_type()
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while True:
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ret = conn.recv(BUFSIZE)
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if len(ret) == 0:
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self.logger.info("Disconnected from %s", addr[0])
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break
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buf += ret
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while len(buf) >= BUFSIZE:
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# self.logger.debug("Received buffer size: %d", len(buf))
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data = buf[:BUFSIZE]
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msg = alert.AlertPkt.parser(data)
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if msg:
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self.send_event_to_observers(EventAlert(msg))
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buf = buf[BUFSIZE:]
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def _set_logger(self):
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"""change log format."""
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self.logger.propagate = False
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hdl = logging.StreamHandler()
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fmt_str = '[snort][%(levelname)s] %(message)s'
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hdl.setFormatter(logging.Formatter(fmt_str))
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self.logger.addHandler(hdl)
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