""" Copyright (c) 2016 Ad Schellevis All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -------------------------------------------------------------------------------------- parse flowd log files """ import flowd import glob import tempfile import subprocess import os # define field PARSE_FLOW_FIELDS = [ {'check': flowd.FIELD_OCTETS, 'target': 'octets'}, {'check': flowd.FIELD_PACKETS, 'target': 'packets'}, {'check': flowd.FIELD_SRC_ADDR, 'target': 'src_addr'}, {'check': flowd.FIELD_DST_ADDR, 'target': 'dst_addr'}, {'check': flowd.FIELD_SRCDST_PORT, 'target': 'src_port'}, {'check': flowd.FIELD_SRCDST_PORT, 'target': 'dst_port'}, {'check': flowd.FIELD_PROTO_FLAGS_TOS, 'target': 'protocol'}, {'check': flowd.FIELD_PROTO_FLAGS_TOS, 'target': 'tcp_flags'}, {'check': flowd.FIELD_PROTO_FLAGS_TOS, 'target': 'tos'}, {'check': flowd.FIELD_IF_INDICES, 'target': 'if_ndx_in'}, {'check': flowd.FIELD_IF_INDICES, 'target': 'if_ndx_out'}, {'check': flowd.FIELD_GATEWAY_ADDR, 'target': 'gateway_addr'}, {'check': flowd.FIELD_FLOW_TIMES, 'target': 'netflow_ver'}] # location of flowd logfiles to use FLOWD_LOG_FILES = '/var/log/flowd.log*' class Interfaces(object): """ mapper for local interface index to interface name (1 -> em0 for example) """ def __init__(self): """ construct local interface mapping """ self._ifIndex = dict() with tempfile.NamedTemporaryFile() as output_stream: subprocess.call(['/sbin/ifconfig', '-l'], stdout=output_stream, stderr=open(os.devnull, 'wb')) output_stream.seek(0) ifIndex=1 for line in output_stream.read().split('\n')[0].split(): self._ifIndex[str(ifIndex)] = line ifIndex += 1 def if_device(self, ifIndex): """ convert index to device (if found) """ if str(ifIndex) in self._ifIndex: # found, return interface name return self._ifIndex[str(ifIndex)] else: # not found, return index return str(ifIndex) def parse_flow(recv_stamp): """ parse flowd logs and yield records (dict type) :param recv_stamp: last receive timestamp (recv) :return: iterator flow details """ interfaces = Interfaces() parse_done = False for filename in sorted(glob.glob(FLOWD_LOG_FILES)): if parse_done: # log file contains older data (recv_stamp), break break flog = flowd.FlowLog(filename) for flow in flog: flow_record = dict() if flow.has_field(flowd.FIELD_RECV_TIME): # receive timestamp flow_record['recv'] = flow.recv_sec if flow_record['recv'] <= recv_stamp: # do not parse next flow archive (oldest reached) parse_done = True continue if flow.has_field(flowd.FIELD_FLOW_TIMES): # calculate flow start, end, duration in ms flow_record['flow_end'] = flow.recv_sec - (flow.sys_uptime_ms - flow.flow_finish) / 1000.0 flow_record['duration_ms'] = (flow.flow_finish - flow.flow_start) flow_record['flow_start'] = flow_record['flow_end'] - flow_record['duration_ms'] / 1000.0 # handle source data for flow_field in PARSE_FLOW_FIELDS: if flow.has_field(flow_field['check']): flow_record[flow_field['target']] = getattr(flow, flow_field['target']) else: flow_record[flow_field['target']] = None # map interface indexes to actual interface names flow_record['if_in'] = interfaces.if_device(flow_record['if_ndx_in']) flow_record['if_out'] = interfaces.if_device(flow_record['if_ndx_out']) yield flow_record # send None to mark last record yield None