bbb7724423
When there is a Snort alert message, Ryu will receive an event called EventAlert. You can easily define the event handler in the method which using ‘set_ev_cls’ decorator with snortlib.EventAlert parameter. The simple_switch_snort.py can install a flow that mirroring incoming packets to the snort's NIC which correspond the OpenFlow switch on port 3 (by default). There are two methods that sending alert message to Ryu. 1. Ryu and Snort are both on the same machine. Ryu receives alert message via Unix Domain Socket. 2. Ryu and Snort are separate on different machines. Ryu receives alert message via Network Socket. More detail see doc/snort_integrate.rst Signed-off-by: Che-Wei Lin <linton.tw@gmail.com> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
126 lines
3.5 KiB
Python
126 lines
3.5 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 struct
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from struct import calcsize
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class SfTimeval32(object):
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_PACK_STR = '!II'
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_SIZE = 8
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def __init__(self, tv_sec, tv_usec):
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self.tv_sec = tv_sec
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self.tv_usec = tv_usec
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@classmethod
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def parser(cls, buf, offset):
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(tv_sec, tv_usec) = struct.unpack_from(
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cls._PACK_STR, buf, offset)
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msg = cls(tv_sec, tv_usec)
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return msg
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class Event(object):
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_PACK_STR = '!IIIIIII'
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_SIZE = 36
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def __init__(self, sig_generator, sig_id, sig_rev, classification,
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priority, event_id, event_reference, ref_time):
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self.sig_generator = sig_generator
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self.sig_id = sig_id
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self.sig_rev = sig_rev
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self.classification = classification
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self.priority = priority
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self.event_id = event_id
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self.event_reference = event_reference
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self.ref_time = ref_time
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@classmethod
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def parser(cls, buf, offset):
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(sig_generator, sig_id, sig_rev, classification, priority,
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event_id, event_reference) = struct.unpack_from(
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cls._PACK_STR, buf, offset)
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offset += calcsize(cls._PACK_STR)
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ref_time = SfTimeval32.parser(buf, offset)
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msg = cls(sig_generator, sig_id, sig_rev, classification,
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priority, event_id, event_reference, ref_time)
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return msg
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class PcapPktHdr32(object):
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_PACK_STR = '!II'
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_SIZE = 16
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def __init__(self, ts, caplen, len_):
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self.ts = ts
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self.caplen = caplen
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self.len = len_
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@classmethod
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def parser(cls, buf, offset):
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ts = SfTimeval32.parser(buf, offset)
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offset += SfTimeval32._SIZE
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(caplen, len_) = struct.unpack_from(
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cls._PACK_STR, buf, offset)
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msg = cls(ts, caplen, len_)
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return msg
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class AlertPkt(object):
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_ALERTMSG_PACK_STR = '!256s'
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_ALERTPKT_PART_PACK_STR = '!IIIII65535s'
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_ALERTPKT_SIZE = 65863
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def __init__(self, alertmsg, pkth, dlthdr, nethdr, transhdr, data,
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val, pkt, event):
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self.alertmsg = alertmsg
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self.pkth = pkth
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self.dlthdr = dlthdr
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self.nethdr = nethdr
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self.transhdr = transhdr
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self.data = data
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self.val = val
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self.pkt = pkt
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self.event = event
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@classmethod
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def parser(cls, buf):
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alertmsg = struct.unpack_from(cls._ALERTMSG_PACK_STR, buf)
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offset = calcsize(cls._ALERTMSG_PACK_STR)
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pkth = PcapPktHdr32.parser(buf, offset)
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offset += PcapPktHdr32._SIZE
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(dlthdr, nethdr, transhdr, data, val, pkt) = \
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struct.unpack_from(cls._ALERTPKT_PART_PACK_STR, buf,
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offset)
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offset += calcsize(cls._ALERTPKT_PART_PACK_STR)
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event = Event.parser(buf, offset)
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msg = cls(alertmsg, pkth, dlthdr, nethdr, transhdr, data, val,
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pkt, event)
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return msg
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