159 lines
4 KiB
Python
159 lines
4 KiB
Python
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#!/usr/bin/env python3
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"""
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Netflow V9 collector implementation in Python 3.
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Created for learning purposes and unsatisfying alternatives.
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(C) 2016 Dominik Pataky <dom@netdecorator.org>
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"""
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from collections import namedtuple
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import socket
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import struct
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HOST = '0.0.0.0'
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PORT = 9001
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# The header of the whole export packet
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#Header = namedtuple('Header', 'version count uptime timestamp sequence id')
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# A template flowset, which holds an id that is used by data flowsets to
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# reference back to the template. The template then has fields which hold
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# identifiers of data types ("IP_SRC_ADDR", "PKTS"). This way the flow sender
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# can dynamically out together data flowsets.
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TemplateFlowset = namedtuple('TemplateFlowset', 'flowset_id length')
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Template = namedtuple('Template', 'template_id field_count')
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TemplateField = namedtuple('TemplateField', 'type length')
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field_types = {
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1: 'IN_BYTES',
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2: 'IN_PKTS',
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3: 'FLOWS',
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4: 'PROTOCOL',
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5: 'SRC_TOS',
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6: 'TCP_FLAGS',
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7: 'L4_SRC_PORT',
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8: 'IPV4_SRC_ADDR',
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9: 'SRC_MASK',
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10: 'INPUT_SNMP',
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11: 'L4_DST_PORT',
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12: 'IPV4_DST_ADDR',
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13: 'DST_MASK',
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14: 'OUTPUT_SNMP',
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15: 'IPV4_NEXT_HOP',
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16: 'SRC_AS',
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17: 'DST_AS',
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18: 'BGP_IPV4_NEXT_HOP',
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19: 'MUL_DST_PKTS',
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20: 'MUL_DST_BYTES',
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21: 'LAST_SWITCHED',
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22: 'FIRST_SWITCHED',
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23: 'OUT_BYTES',
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24: 'OUT_PKTS',
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25: 'MIN_PKT_LNGTH',
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26: 'MAX_PKT_LNGTH',
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27: 'IPV6_SRC_ADDR',
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28: 'IPV6_DST_ADDR',
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29: 'IPV6_SRC_MASK',
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30: 'IPV6_DST_MASK',
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31: 'IPV6_FLOW_LABEL',
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32: 'ICMP_TYPE',
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33: 'MUL_IGMP_TYPE',
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34: 'SAMPLING_INTERVAL',
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35: 'SAMPLING_ALGORITHM',
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36: 'FLOW_ACTIVE_TIMEOUT',
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37: 'FLOW_INACTIVE_TIMEOUT',
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38: 'ENGINE_TYPE',
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39: 'ENGINE_ID',
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40: 'TOTAL_BYTES_EXP',
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41: 'TOTAL_PKTS_EXP',
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42: 'TOTAL_FLOWS_EXP',
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# 43 vendor proprietary
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44: 'IPV4_SRC_PREFIX',
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45: 'IPV4_DST_PREFIX',
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46: 'MPLS_TOP_LABEL_TYPE',
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47: 'MPLS_TOP_LABEL_IP_ADDR',
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48: 'FLOW_SAMPLER_ID',
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49: 'FLOW_SAMPLER_MODE',
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50: 'NTERVAL',
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# 51 vendor proprietary
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52: 'MIN_TTL',
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53: 'MAX_TTL',
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54: 'IPV4_IDENT',
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55: 'DST_TOS',
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56: 'IN_SRC_MAC',
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57: 'OUT_DST_MAC',
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58: 'SRC_VLAN',
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59: 'DST_VLAN',
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60: 'IP_PROTOCOL_VERSION',
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61: 'DIRECTION',
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62: 'IPV6_NEXT_HOP',
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63: 'BPG_IPV6_NEXT_HOP',
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64: 'IPV6_OPTION_HEADERS',
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# 65-69 vendor proprietary
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70: 'MPLS_LABEL_1',
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71: 'MPLS_LABEL_2',
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72: 'MPLS_LABEL_3',
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73: 'MPLS_LABEL_4',
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74: 'MPLS_LABEL_5',
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75: 'MPLS_LABEL_6',
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76: 'MPLS_LABEL_7',
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77: 'MPLS_LABEL_8',
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78: 'MPLS_LABEL_9',
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79: 'MPLS_LABEL_10',
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80: 'IN_DST_MAC',
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81: 'OUT_SRC_MAC',
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82: 'IF_NAME',
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83: 'IF_DESC',
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84: 'SAMPLER_NAME',
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85: 'IN_PERMANENT_BYTES',
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86: 'IN_PERMANENT_PKTS',
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# 87 vendor property
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88: 'FRAGMENT_OFFSET',
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89: 'FORWARDING STATUS',
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}
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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sock.bind((HOST, PORT))
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print("Listening on interface {}:{}".format(HOST, PORT))
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class TemplateField:
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pass
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class Template:
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pass
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class TemplateFlowSet:
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pass
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class Header:
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"""The header of the flow record.
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"""
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def __init__(self, data):
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self.version, self.count = struct.unpack('!HH', data[0:4])
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(self.uptime, self.timestamp, self.sequence,
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self.source_id) = struct.unpack('!IIII', data[4:])
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class FlowRecord:
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"""The flow record holds the header and all template and data flowsets.
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"""
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def __init__(self, data):
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self.header = Header(data[:20])
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def __repr__(self):
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return "<FlowRecord version {} counting {} flowset records>".format(
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self.header.version, self.header.count)
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while 1:
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(data, sender) = sock.recvfrom(8192)
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print("Received data from {}, length {}".format(sender, len(data)))
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#header = Header(data[:20])
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#header = ExportHeaderV9._make(struct.unpack("!HHIIII", data[:20]))
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#template = ExportTemplateV9._make(struct.unpack("!HHHH", data[20:28]))
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record = FlowRecord(data)
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print(record)
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