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# encoding: utf-8 |
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""" |
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check.py |
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Created by Thomas Mangin on 2009-08-25. |
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Copyright (c) 2009-2017 Exa Networks. All rights reserved. |
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License: 3-clause BSD. (See the COPYRIGHT file) |
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""" |
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# common |
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import copy |
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from exabgp.bgp.message import Update |
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from exabgp.bgp.message import Open |
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from exabgp.bgp.message.open import Version |
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from exabgp.bgp.message.open import ASN |
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from exabgp.bgp.message.open import RouterID |
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from exabgp.bgp.message.open import HoldTime |
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from exabgp.bgp.message.open.capability import Capabilities |
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from exabgp.bgp.message.open.capability import Capability |
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from exabgp.bgp.message.open.capability import Negotiated |
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from exabgp.bgp.message import Notify |
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from exabgp.bgp.message.update.nlri import NLRI |
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from exabgp.logger import log |
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# check_neighbor |
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from exabgp.util.od import od |
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from exabgp.rib.change import Change |
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# check_update |
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from exabgp.reactor.api.response import Response |
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# check_notification |
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from exabgp.bgp.message import Notification |
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# JSON version |
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from exabgp.version import json as json_version |
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# =============================================================== check_neighbor |
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# ... |
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def check_generation(neighbors): |
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log._option['parser'] = True |
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for name in neighbors.keys(): |
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neighbor = copy.deepcopy(neighbors[name]) |
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neighbor.local_as = neighbor.peer_as |
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path = {} |
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for f in NLRI.known_families(): |
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if neighbor.add_path: |
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path[f] = neighbor.add_path |
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capa = Capabilities().new(neighbor, False) |
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if path: |
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capa[Capability.CODE.ADD_PATH] = path |
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capa[Capability.CODE.MULTIPROTOCOL] = neighbor.families() |
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routerid_1 = str(neighbor.router_id) |
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routerid_2 = '.'.join(str((int(_) + 1) % 250) for _ in str(neighbor.router_id).split('.', -1)) |
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o1 = Open(Version(4), ASN(neighbor.local_as), HoldTime(180), RouterID(routerid_1), capa) |
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o2 = Open(Version(4), ASN(neighbor.peer_as), HoldTime(180), RouterID(routerid_2), capa) |
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negotiated = Negotiated(neighbor) |
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negotiated.sent(o1) |
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negotiated.received(o2) |
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# grouped = False |
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for _ in neighbor.rib.outgoing.updates(False): |
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pass |
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for change1 in neighbor.rib.outgoing.cached_changes(): |
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str1 = change1.extensive() |
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packed = list(Update([change1.nlri], change1.attributes).messages(negotiated)) |
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pack1 = packed[0] |
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log.debug('parsed route requires %d updates' % len(packed), 'parser') |
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log.debug('update size is %d' % len(pack1), 'parser') |
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log.debug('parsed route %s' % str1, 'parser') |
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log.debug('parsed hex %s' % od(pack1), 'parser') |
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# This does not take the BGP header - let's assume we will not break that :) |
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try: |
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log.debug('') # new line |
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pack1s = pack1[19:] if pack1.startswith(b'\xFF' * 16) else pack1 |
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update = Update.unpack_message(pack1s, negotiated) |
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change2 = Change(update.nlris[0], update.attributes) |
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str2 = change2.extensive() |
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pack2 = list(Update([update.nlris[0]], update.attributes).messages(negotiated))[0] |
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log.debug('recoded route %s' % str2, 'parser') |
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log.debug('recoded hex %s' % od(pack2), 'parser') |
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str1 = str1.replace('attribute [ 0x04 0x80 0x00000064 ]', 'med 100') |
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str1r = ( |
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str1.lower().replace(' med 100', '').replace(' local-preference 100', '').replace(' origin igp', '') |
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) |
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str2r = ( |
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str2.lower().replace(' med 100', '').replace(' local-preference 100', '').replace(' origin igp', '') |
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) |
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str2r = str2r.replace( |
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'large-community [ 1:2:3 10:11:12 ]', |
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'attribute [ 0x20 0xc0 0x0000000100000002000000030000000a0000000b0000000c ]', |
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) |
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if 'next-hop self' in str1r: |
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if ':' in str1r: |
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str1r = str1r.replace('next-hop self', 'next-hop ::1') |
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else: |
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str1r = str1r.replace('next-hop self', 'next-hop %s' % neighbor.local_address) |
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if ' name ' in str1r: |
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parts = str1r.split(' ') |
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pos = parts.index('name') |
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str1r = ' '.join(parts[:pos] + parts[pos + 2 :]) |
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skip = False |
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if str1r != str2r: |
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if 'attribute [' in str1r and ' 0x00 ' in str1r: |
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# we do not decode non-transitive attributes |
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log.debug('skipping string check on update with non-transitive attribute(s)', 'parser') |
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skip = True |
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else: |
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log.debug('strings are different:', 'parser') |
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log.debug('[%s]' % (str1r), 'parser') |
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log.debug('[%s]' % (str2r), 'parser') |
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return False |
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else: |
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log.debug('strings are fine', 'parser') |
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if skip: |
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log.debug('skipping encoding for update with non-transitive attribute(s)', 'parser') |
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elif pack1 != pack2: |
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log.debug('encoding are different', 'parser') |
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log.debug('[%s]' % (od(pack1)), 'parser') |
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log.debug('[%s]' % (od(pack2)), 'parser') |
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return False |
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else: |
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log.debug('encoding is fine', 'parser') |
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log.debug('----------------------------------------', 'parser') |
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log.debug('JSON nlri %s' % change1.nlri.json(), 'parser') |
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log.debug('JSON attr %s' % change1.attributes.json(), 'parser') |
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except Notify as exc: |
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log.debug('----------------------------------------', 'parser') |
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log.debug(str(exc), 'parser') |
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log.debug('----------------------------------------', 'parser') |
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return False |
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neighbor.rib.clear() |
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return True |
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# ================================================================ check_message |
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# |
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def check_message(neighbor, message): |
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message = message.replace(':', '') |
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msghexa = [message[i * 2 : (i * 2) + 2] for i in range(len(message) // 2)] |
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raw = bytes([int(_, 16) for _ in msghexa]) |
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if raw.startswith(b'\xff' * 16): |
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kind = raw[18] |
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# XXX: FIXME: check size |
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# size = (raw[16] << 16) + raw[17] |
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if kind == 1: |
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return check_open(neighbor, raw[18:]) |
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elif kind == 2: |
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return check_update(neighbor, raw) |
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elif kind == 3: |
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return check_notification(raw) |
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else: |
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return check_update(neighbor, raw) |
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# ================================================================= check_update |
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# |
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def check_open(neighbor, raw): |
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pass |
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# ================================================================= check_update |
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# |
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def check_update(neighbor, raw): |
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log._option['parser'] = True |
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neighbor = neighbor[list(neighbor)[0]] |
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path = {} |
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for f in NLRI.known_families(): |
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if neighbor.add_path: |
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path[f] = neighbor.add_path |
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capa = Capabilities().new(neighbor, False) |
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capa[Capability.CODE.ADD_PATH] = path |
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capa[Capability.CODE.MULTIPROTOCOL] = neighbor.families() |
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# capa[Capability.CODE.FOUR_BYTES_ASN] = True |
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routerid_1 = str(neighbor.router_id) |
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routerid_2 = '.'.join(str((int(_) + 1) % 250) for _ in str(neighbor.router_id).split('.', -1)) |
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o1 = Open(Version(4), ASN(neighbor.local_as), HoldTime(180), RouterID(routerid_1), capa) |
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o2 = Open(Version(4), ASN(neighbor.peer_as), HoldTime(180), RouterID(routerid_2), capa) |
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negotiated = Negotiated(neighbor) |
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negotiated.sent(o1) |
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negotiated.received(o2) |
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# grouped = False |
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while raw: |
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if raw.startswith(b'\xff' * 16): |
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kind = raw[18] |
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size = (raw[16] << 16) + raw[17] |
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injected, raw = raw[19:size], raw[size:] |
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if kind == 2: |
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log.debug('the message is an update', 'parser') |
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decoding = 'update' |
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else: |
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log.debug('the message is not an update (%d) - aborting' % kind, 'parser') |
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return False |
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else: |
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log.debug('header missing, assuming this message is ONE update', 'parser') |
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decoding = 'update' |
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injected, raw = raw, '' |
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try: |
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# This does not take the BGP header - let's assume we will not break that :) |
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update = Update.unpack_message(injected, negotiated) |
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except Notify: |
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import traceback |
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log.error('could not parse the message', 'parser') |
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log.error(traceback.format_exc(), 'parser') |
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return False |
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except Exception: |
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import traceback |
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log.error('could not parse the message', 'parser') |
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log.error(traceback.format_exc(), 'parser') |
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return False |
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log.debug('', 'parser') # new line |
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for number in range(len(update.nlris)): |
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change = Change(update.nlris[number], update.attributes) |
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log.info('decoded %s %s %s' % (decoding, change.nlri.action, change.extensive()), 'parser') |
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log.info( |
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'update json %s' % Response.JSON(json_version).update(neighbor, 'in', update, None, '', ''), 'parser' |
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) |
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return True |
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271
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# ================================================================= check_update |
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# |
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274
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275
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def check_notification(raw): |
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notification = Notification.unpack_message(raw[18:], None) |
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# XXX: FIXME: should be using logger here |
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print(notification) |
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return True |
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Exa-Networks /
exabgp
