def detect_conflicts(collector,
files,
opener=default_opener,
format=mabo_format,
is_watched=None,
rib=None):
"""
Get a list of conflicts (hijacks without annotation) from the BGP files
(bviews and updates).
:param collector: Name of the collector the files come from
:param files: List of files to process
:param opener: Function to use in order to open the files
:param format: Format of the BGP data in the files
:param is_watched: Function returning True if the BGP update must be followed
:return: Generator of conflicts
"""
if rib is None:
rib = EmulatedRIB()
queue = deque(files)
# insert initial bview in the RIB
bviews = []
while len(queue):
try:
bview_file = queue.popleft()
with opener(bview_file) as f:
for data in f:
for msg in format(collector, data):
if msg.type != "F":
raise ValueError
if len(list(default_route(msg))) > 0:
logger.warning("got a default route %s", msg)
continue
if is_watched is None or is_watched(msg):
route(rib, msg, data)
except ValueError:
# this file is not a bview, stop right now
queue.appendleft(bview_file)
break
else:
bviews.append(bview_file)
if len(bviews) == 0 and len(rib.nodes()) == 0:
# In case of pre-populated RIB, supplying rib records again
# is not a requirement. Can also be invoked with only the update records.
raise ValueError("no bviews were loaded")
# play all BGP updates to detect BGP conflicts
for file in chain(bviews, queue):
with opener(file) as f:
for data in f:
for msg in format(collector, data):
default, _, conflicts = process_message(
rib, collector, msg, is_watched)
if len(default) > 0:
logger.warning("got a default route %s", msg)
for conflict in conflicts:
yield conflict
def detect_conflicts(collector, files, opener=default_opener,
format=mabo_format, is_watched=None, rib=None):
"""
Get a list of conflicts (hijacks without annotation) from the BGP files
(bviews and updates).
:param collector: Name of the collector the files come from
:param files: List of files to process
:param opener: Function to use in order to open the files
:param format: Format of the BGP data in the files
:param is_watched: Function returning True if the BGP update must be followed
:return: Generator of conflicts
"""
if rib is None:
rib = EmulatedRIB()
queue = deque(files)
# insert initial bview in the RIB
bviews = []
while len(queue):
try:
bview_file = queue.popleft()
with opener(bview_file) as f:
for data in f:
for msg in format(collector, data):
if msg.type != "F":
raise ValueError
if len(list(default_route(msg))) > 0:
logger.warning("got a default route %s", msg)
continue
if is_watched is None or is_watched(msg):
route(rib, msg, data)
except ValueError:
# this file is not a bview, stop right now
queue.appendleft(bview_file)
break
else:
bviews.append(bview_file)
if len(bviews) == 0 and len(rib.nodes()) == 0:
# In case of pre-populated RIB, supplying rib records again
# is not a requirement. Can also be invoked with only the update records.
raise ValueError("no bviews were loaded")
# play all BGP updates to detect BGP conflicts
for file in chain(bviews, queue):
with opener(file) as f:
for data in f:
for msg in format(collector, data):
default, _, conflicts = process_message(
rib, collector, msg, is_watched)
if len(default) > 0:
logger.warning("got a default route %s", msg)
for conflict in conflicts:
yield conflict
def process_message(rib, collector, message, is_watched=None, data=None):
"""
Modify the RIB according to the BGP `message'.
"""
default = list(default_route(message))
if len(default) > 0:
# XXX replace with a filter function
# we ignore default routes
return default, [], []
conflicts = list(hijack(rib, message))
if message.as_path is None or message.origin is None:
routes = withdraw(rib, message)
elif len(conflicts) > 0 \
or is_watched is None or is_watched(message) is True:
routes = route(rib, message, data)
else:
routes = []
return default, routes, conflicts
