def unpack_message(cls, data, negotiated): # pylint: disable=W0613
what = Type(unpack('!H', data[0:2])[0])
length = unpack('!H', data[2:4])[0]
decode, klass = cls.registered_operational.get(what, ('unknown', None))
if decode == 'advisory':
afi = unpack('!H', data[4:6])[0]
safi = ordinal(data[6])
data = data[7:length + 4]
return klass(afi, safi, data)
elif decode == 'query':
afi = unpack('!H', data[4:6])[0]
safi = ordinal(data[6])
routerid = RouterID.unpack(data[7:11])
sequence = unpack('!L', data[11:15])[0]
return klass(afi, safi, routerid, sequence)
elif decode == 'counter':
afi = unpack('!H', data[4:6])[0]
safi = ordinal(data[6])
routerid = RouterID.unpack(data[7:11])
sequence = unpack('!L', data[11:15])[0]
counter = unpack('!L', data[15:19])[0]
return klass(afi, safi, routerid, sequence, counter)
else:
print('ignoring ATM this kind of message')
def setUp(self):
self.negotiated = {}
for asn4 in (True, False):
neighbor = FakeNeighbor()
neighbor.asn4 = asn4
capa = Capabilities().new(neighbor, False)
capa[Capability.CODE.MULTIPROTOCOL] = neighbor.families()
# path = {}
# for f in NLRI.known_families():
# if neighbor.add_path:
# path[f] = neighbor.add_path
# capa[Capability.CODE.ADD_PATH] = path
routerid_1 = str(neighbor.router_id)
routerid_2 = '.'.join(
str((int(_) + 1) % 250)
for _ in str(neighbor.router_id).split('.', -1))
o1 = Open(Version(4), ASN(neighbor.local_as), HoldTime(180),
RouterID(routerid_1), capa)
o2 = Open(Version(4), ASN(neighbor.peer_as), HoldTime(180),
RouterID(routerid_2), capa)
negotiated = Negotiated(neighbor)
negotiated.sent(o1)
negotiated.received(o2)
self.negotiated[asn4] = negotiated
def unpack_message (cls, data, negotiated): # pylint: disable=W0613
what = Type(unpack('!H',data[0:2])[0])
length = unpack('!H',data[2:4])[0]
decode,klass = cls.registered_operational.get(what,('unknown',None))
if decode == 'advisory':
afi = unpack('!H',data[4:6])[0]
safi = ordinal(data[6])
data = data[7:length+4]
return klass(afi,safi,data)
elif decode == 'query':
afi = unpack('!H',data[4:6])[0]
safi = ordinal(data[6])
routerid = RouterID.unpack(data[7:11])
sequence = unpack('!L',data[11:15])[0]
return klass(afi,safi,routerid,sequence)
elif decode == 'counter':
afi = unpack('!H',data[4:6])[0]
safi = ordinal(data[6])
routerid = RouterID.unpack(data[7:11])
sequence = unpack('!L',data[11:15])[0]
counter = unpack('!L',data[15:19])[0]
return klass(afi,safi,routerid,sequence,counter)
else:
print('ignoring ATM this kind of message')
def OperationalFactory (data):
what = Type(unpack('!H',data[0:2])[0])
length = unpack('!H',data[2:4])[0]
if what == OperationalType.ADM:
afi = unpack('!H',data[4:6])[0]
safi = ord(data[6])
data = data[7:length+4]
return Advisory.ADM(afi,safi,data)
elif what == OperationalType.ASM:
afi = unpack('!H',data[4:6])[0]
safi = ord(data[6])
data = data[7:length+4]
return Advisory.ASM(afi,safi,data)
elif what == OperationalType.RPCQ:
afi = unpack('!H',data[4:6])[0]
safi = ord(data[6])
routerid = RouterID(unpack('!H',data[7:9])[0])
sequence = unpack('!H',data[9:11])[0]
return State.RPCQ(afi,safi,routerid,sequence)
elif what == OperationalType.RPCP:
afi = unpack('!H',data[4:6])[0]
safi = ord(data[6])
routerid = RouterID(unpack('!H',data[7:9])[0])
sequence = unpack('!H',data[9:11])[0]
count = unpack('!H',data[11:15])[0]
return State.RPCQ(afi,safi,routerid,sequence,count)
else:
print 'ignoring ATM this kind of message'
def setUp(self):
self.negotiated = {}
for asn4 in (True, False):
neighbor = FakeNeighbor()
neighbor.asn4 = asn4
capa = Capabilities().new(neighbor, False)
capa[Capability.CODE.MULTIPROTOCOL] = neighbor.families()
# path = {}
# for f in NLRI.known_families():
# if neighbor.add_path:
# path[f] = neighbor.add_path
# capa[Capability.CODE.ADD_PATH] = path
o1 = Open(Version(4), ASN(neighbor.local_as), HoldTime(180),
RouterID(neighbor.local_address.top()), capa)
o2 = Open(Version(4), ASN(neighbor.peer_as), HoldTime(180),
RouterID(neighbor.peer_address.top()), capa)
negotiated = Negotiated(neighbor)
negotiated.sent(o1)
negotiated.received(o2)
self.negotiated[asn4] = negotiated
def OperationalFactory(data):
what = Type(unpack('!H', data[0:2])[0])
length = unpack('!H', data[2:4])[0]
decode, klass = OperationalGroup.get(what, ('unknown', None))
if decode == 'advisory':
afi = unpack('!H', data[4:6])[0]
safi = ord(data[6])
data = data[7:length + 4]
return klass(afi, safi, data)
elif decode == 'query':
afi = unpack('!H', data[4:6])[0]
safi = ord(data[6])
routerid = RouterID('.'.join(str(ord(_)) for _ in data[7:11]))
sequence = unpack('!L', data[11:15])[0]
return klass(afi, safi, routerid, sequence)
elif decode == 'counter':
afi = unpack('!H', data[4:6])[0]
safi = ord(data[6])
routerid = RouterID('.'.join(str(ord(_)) for _ in data[7:11]))
sequence = unpack('!L', data[11:15])[0]
counter = unpack('!L', data[15:19])[0]
return klass(afi, safi, routerid, sequence, counter)
elif decode == 'interface':
afi = unpack('!H', data[4:6])[0]
safi = ord(data[6])
routerid = RouterID('.'.join(str(ord(_)) for _ in data[7:11]))
sequence = unpack('!L', data[11:15])[0]
rxc = unpack('!L', data[15:19])[0]
txc = unpack('!L', data[19:23])[0]
return klass(afi, safi, routerid, sequence, rxc, txc)
else:
print 'ignoring ATM this kind of message'
def __init__ (self,what,afi,safi,routerid,sequence=None,data=''):
self.routerid = routerid
self.routerid = RouterID(routerid)
self.sequence = self._sequence() if sequence is None else sequence
OperationalFamily.__init__(
self,what,
afi,safi,
'%s%s%s' % (self.routerid.pack(),pack('!H',self.sequence),data)
)
class Open(Message):
ID = Message.CODE.OPEN
TYPE = chr(Message.CODE.OPEN)
def __init__(self, version, asn, router_id, capabilities, hold_time):
self.version = Version(version)
self.asn = ASN(asn)
self.hold_time = HoldTime(hold_time)
self.router_id = RouterID(router_id)
self.capabilities = capabilities
def message(self, negotiated=None):
return self._message(
"%s%s%s%s%s" %
(self.version.pack(), self.asn.trans(), self.hold_time.pack(),
self.router_id.pack(), self.capabilities.pack()))
def __str__(self):
return "OPEN version=%d asn=%d hold_time=%s router_id=%s capabilities=[%s]" % (
self.version, self.asn, self.hold_time, self.router_id,
self.capabilities)
@classmethod
def unpack_message(cls, data, _=None):
version = ord(data[0])
if version != 4:
# Only version 4 is supported nowdays..
raise Notify(2, 1, data[0])
asn = unpack('!H', data[1:3])[0]
hold_time = unpack('!H', data[3:5])[0]
numeric = unpack('!L', data[5:9])[0]
router_id = "%d.%d.%d.%d" % (numeric >> 24, (numeric >> 16) & 0xFF,
(numeric >> 8) & 0xFF, numeric & 0xFF)
capabilities = Capabilities.unpack(data[9:])
return cls(version, asn, router_id, capabilities, hold_time)
class Open (Message):
ID = Message.CODE.OPEN
TYPE = chr(Message.CODE.OPEN)
def __init__ (self, version, asn, router_id, capabilities, hold_time):
self.version = Version(version)
self.asn = ASN(asn)
self.hold_time = HoldTime(hold_time)
self.router_id = RouterID(router_id)
self.capabilities = capabilities
def message (self):
return self._message("%s%s%s%s%s" % (
self.version.pack(),
self.asn.trans(),
self.hold_time.pack(),
self.router_id.pack(),
self.capabilities.pack()
))
def __str__ (self):
return "OPEN version=%d asn=%d hold_time=%s router_id=%s capabilities=[%s]" % (self.version, self.asn, self.hold_time, self.router_id,self.capabilities)
@classmethod
def unpack_message (cls, data, _):
version = ord(data[0])
if version != 4:
# Only version 4 is supported nowdays..
raise Notify(2,1,data[0])
asn = unpack('!H',data[1:3])[0]
hold_time = unpack('!H',data[3:5])[0]
numeric = unpack('!L',data[5:9])[0]
router_id = "%d.%d.%d.%d" % (numeric >> 24,(numeric >> 16) & 0xFF,(numeric >> 8) & 0xFF,numeric & 0xFF)
capabilities = Capabilities.unpack(data[9:])
return cls(version,asn,router_id,capabilities,hold_time)
def validate (self, neighbor):
if self.peer_as != neighbor.peer_as:
return (2,2,'ASN in OPEN (%d) did not match ASN expected (%d)' % (self.received_open.asn,neighbor.peer_as))
# RFC 6286 : https://tools.ietf.org/html/rfc6286
# XXX: FIXME: check that router id is not self
if self.received_open.router_id == RouterID('0.0.0.0'):
return (2,3,'0.0.0.0 is an invalid router_id')
if self.received_open.asn == neighbor.local_as:
# router-id must be unique within an ASN
if self.received_open.router_id == neighbor.router_id:
return (2,3,'BGP Identifier collision, same router-id (%s) on both sides of this IBGP session' % self.received_open.router_id)
if self.received_open.hold_time and self.received_open.hold_time < 3:
return (2,6,'Hold Time is invalid (%d)' % self.received_open.hold_time)
if self.multisession not in (True,False):
# XXX: FIXME: should we not use a string and perform a split like we do elswhere ?
# XXX: FIXME: or should we use this trick in the other case ?
return self.multisession
s = set(self.sent_open.capabilities.get(Capability.CODE.MULTIPROTOCOL,[]))
r = set(self.received_open.capabilities.get(Capability.CODE.MULTIPROTOCOL,[]))
mismatch = s ^ r
for family in mismatch:
self.mismatch.append(('exabgp' if family in r else 'peer',family))
return None
def aggregator(self, scope, name, command, tokens):
try:
if tokens:
if tokens.pop(0) != '(':
raise ValueError('invalid aggregator syntax')
asn, address = tokens.pop(0).split(':')
if tokens.pop(0) != ')':
raise ValueError('invalid aggregator syntax')
local_as = ASN(asn)
local_address = RouterID(address)
else:
local_as = scope[-1]['local-as']
local_address = scope[-1]['local-address']
except (ValueError, IndexError):
return self.error.set(self.syntax)
except KeyError:
return self.error(
'local-as and/or local-address missing from neighbor/group to make aggregator'
)
except ValueError:
return self.error.set(self.syntax)
scope[-1]['announce'][-1].attributes.add(
Aggregator(local_as, local_address))
return True
def validate (self,neighbor):
if not self.asn4:
if neighbor.local_as.asn4():
return (2,0,'peer does not speak ASN4, we are stuck')
else:
# we will use RFC 4893 to convey new ASN to the peer
# XXX: FIXME
pass
if self.peer_as != neighbor.peer_as:
return (2,2,'ASN in OPEN (%d) did not match ASN expected (%d)' % (self.received_open.asn,neighbor.peer_as))
# RFC 6286 : http://tools.ietf.org/html/rfc6286
# XXX: FIXME: check that router id is not self
if self.received_open.router_id == RouterID('0.0.0.0'):
return (2,3,'0.0.0.0 is an invalid router_id')
if self.received_open.asn == neighbor.local_as:
# router-id must be unique within an ASN
if self.received_open.router_id == neighbor.router_id:
return (2,3,'BGP Indendifier collision, same router-id (%s) on both side of this IBGP session' % self.received_open.router_id)
if self.received_open.hold_time and self.received_open.hold_time < 3:
return (2,6,'Hold Time is invalid (%d)' % self.received_open.hold_time)
if self.multisession not in (True,False):
# XXX: FIXME: should we not use a string and perform a split like we do elswhere ?
# XXX: FIXME: or should we use this trick in the other case ?
return self.multisession
return None
def __init__(self):
self.update({
'description': 'a test neighbor',
'router-id': RouterID('127.0.0.1'),
'local-address': IPv4('127.0.0.1'),
'peer-address': IPv4('127.0.0.1'),
'host-name': 'localhost',
'domain-name': 'localdomain',
'peer-as': ASN('65500'),
'local-as': ASN('65500'),
'hold-time': HoldTime(180),
'capability': {
'asn4': False,
'add-path': 0,
'extended_message': False,
'nexthop': None,
'route-refresh': False,
'graceful-restart': False,
'multi-session': None,
'add-path': None,
'aigp': None,
'operational': None,
'extended-message': True,
},
})
class FakeNeighbor(object):
description = 'a test neighbor'
router_id = RouterID('127.0.0.1')
local_address = IPv4('127.0.0.1')
peer_address = IPv4('127.0.0.1')
host_name = 'localhost'
domain_name = 'localdomain'
peer_as = ASN('65500')
local_as = ASN('65500')
hold_time = HoldTime(180)
asn4 = False
add_path = 0
extended_message = False
nexthop = None
# capability
route_refresh = False
graceful_restart = False
multisession = None
add_path = None
aigp = None
operational = None
@staticmethod
def families():
return NLRI.known_families()
def _operational(klass, parameters, tokeniser):
def utf8(string):
return string.encode('utf-8')
def valid(_):
return True
def u32(_):
return int(_) <= 0xFFFFFFFF
def u64(_):
return int(_) <= 0xFFFFFFFFFFFFFFFF
def advisory(_):
return len(_.encode('utf-8')) <= MAX_ADVISORY + 2 # the two quotes
convert = {'afi': AFI.value, 'safi': SAFI.value, 'sequence': int, 'counter': int, 'advisory': utf8}
validate = {
'afi': AFI.value,
'safi': SAFI.value,
'sequence': u32,
'counter': u64,
}
number = len(parameters) * 2
tokens = []
while len(tokens) != number:
tokens.append(tokeniser())
data = {}
while tokens and parameters:
command = tokens.pop(0).lower()
value = tokens.pop(0)
if command == 'router-id':
if isipv4(value):
data['routerid'] = RouterID(value)
else:
raise ValueError('invalid operational value for %s' % command)
continue
expected = parameters.pop(0)
if command != expected:
raise ValueError('invalid operational syntax, unknown argument %s' % command)
if not validate.get(command, valid)(value):
raise ValueError('invalid operational value for %s' % command)
data[command] = convert[command](value)
if tokens or parameters:
raise ValueError('invalid advisory syntax, missing argument(s) %s' % ', '.join(parameters))
if 'routerid' not in data:
data['routerid'] = None
return klass(**data)
def test_2_open(self):
capabilities = Capabilities()
o = Open(4, 65500, '127.0.0.1', capabilities, 180)
self.assertEqual(o.version, 4)
self.assertEqual(o.asn, 65500)
self.assertEqual(o.router_id, RouterID('127.0.0.1'))
self.assertEqual(o.hold_time, 180)
self.assertEqual(o.capabilities, {})
def router_id(self, scope, name, command, tokens):
try:
ip = RouterID(tokens[0])
except (IndexError, ValueError):
return self.error.set('"%s" is an invalid IP address' %
' '.join(tokens))
scope[-1][command] = ip
return True
def unpack_message(cls, data, _=None):
version = data[0]
if version != 4:
# Only version 4 is supported nowdays..
raise Notify(2, 1, bytes(data[0], 'ascii'))
asn = unpack('!H', data[1:3])[0]
hold_time = unpack('!H', data[3:5])[0]
numeric = unpack('!L', data[5:9])[0]
router_id = "%d.%d.%d.%d" % (numeric >> 24, (numeric >> 16) & 0xFF, (numeric >> 8) & 0xFF, numeric & 0xFF)
return cls(Version(version), ASN(asn), HoldTime(hold_time), RouterID(router_id), Capabilities.unpack(data[9:]))
class SequencedOperationalFamily (OperationalFamily):
__sequence_number = 0
def _sequence (self):
self.__sequence_number +=1
return self.__sequence_number
def __init__ (self,what,afi,safi,routerid,sequence=None,data=''):
self.routerid = routerid
self.routerid = RouterID(routerid)
self.sequence = self._sequence() if sequence is None else sequence
OperationalFamily.__init__(
self,what,
afi,safi,
'%s%s%s' % (self.routerid.pack(),pack('!H',self.sequence),data)
)
def aggregator(tokeniser):
value = tokeniser()
if value != '(':
tokeniser.rewind(value)
return None
try:
as_number, address = tokeniser().split(':')
except (ValueError, IndexError):
raise ValueError('invalid aggregator')
value = tokeniser()
if value != ')':
raise ValueError('invalid aggregator')
local_as = ASN(as_number)
local_address = RouterID(address)
# XXX: This is buggy it can be an Aggregator4
return Aggregator(local_as, local_address)
class Neighbor:
description = 'a test neighbor'
router_id = RouterID('127.0.0.1')
local_address = IPv4('127.0.0.1')
peer_address = IPv4('127.0.0.1')
peer_as = ASN('65500')
local_as = ASN('65500')
hold_time = HoldTime(180)
asn4 = False
add_path = 0
# capability
route_refresh = False
graceful_restart = False
multisession = None
add_path = None
aigp = None
@staticmethod
def families():
return known_families()
class Open (Message):
TYPE = chr(Message.Type.OPEN)
def __init__ (self,version,asn,router_id,capabilities,hold_time):
self.version = Version(version)
self.asn = ASN(asn)
self.hold_time = HoldTime(hold_time)
self.router_id = RouterID(router_id)
self.capabilities = capabilities
def message (self):
return self._message("%s%s%s%s%s" % (
self.version.pack(),
self.asn.trans(),
self.hold_time.pack(),
self.router_id.pack(),
self.capabilities.pack()
))
def __str__ (self):
return "OPEN version=%d asn=%d hold_time=%s router_id=%s capabilities=[%s]" % (self.version, self.asn, self.hold_time, self.router_id,self.capabilities)
message_id = 1
body = ''.join([
chr(c) for c in [
0x4, 0xff, 0xfe, 0x0, 0xb4, 0x0, 0x0, 0x0, 0x0, 0x20, 0x2, 0x6,
0x1, 0x4, 0x0, 0x1, 0x0, 0x1, 0x2, 0x6, 0x1, 0x4, 0x0, 0x2,
0x0, 0x1, 0x2, 0x2, 0x80, 0x0, 0x2, 0x2, 0x2, 0x0, 0x2, 0x6,
0x41, 0x4, 0x0, 0x0, 0xff, 0xfe
]
])
negotiated = {'invalid': 'test'}
o = Message.unpack(message_id, body, negotiated)
self.assertEqual(o.version, 4)
self.assertEqual(o.asn, 65534)
self.assertEqual(o.router_id, RouterID('0.0.0.0'))
self.assertEqual(o.hold_time, 180)
for k, v in o.capabilities.items():
self.assertEqual(v, check_capa[k])
def test_2_open(self):
capabilities = Capabilities()
o = Open(4, 65500, '127.0.0.1', capabilities, 180)
self.assertEqual(o.version, 4)
self.assertEqual(o.asn, 65500)
self.assertEqual(o.router_id, RouterID('127.0.0.1'))
self.assertEqual(o.hold_time, 180)
self.assertEqual(o.capabilities, {})
if __name__ == '__main__':
def __init__ (self, version, asn, router_id, capabilities, hold_time): self.version = Version(version) self.asn = ASN(asn) self.hold_time = HoldTime(hold_time) self.router_id = RouterID(router_id) self.capabilities = capabilities
def new_connections(self):
if not self.serving:
return
yield None
reactor = self._reactor
ranged_neighbor = []
for connection in self._connected():
self.logger.debug('new connection received %s' % connection.name(),
'network')
for key in reactor.peers:
peer = reactor.peers[key]
neighbor = peer.neighbor
connection_local = IP.create(connection.local).address()
neighbor_peer_start = neighbor.peer_address.address()
neighbor_peer_next = neighbor_peer_start + neighbor.range_size
if not neighbor_peer_start <= connection_local < neighbor_peer_next:
continue
connection_peer = IP.create(connection.peer).address()
neighbor_local = neighbor.local_address.address()
if connection_peer != neighbor_local:
if not neighbor.auto_discovery:
continue
# we found a range matching for this connection
# but the peer may already have connected, so
# we need to iterate all individual peers before
# handling "range" peers
if neighbor.range_size > 1:
ranged_neighbor.append(peer.neighbor)
continue
denied = peer.handle_connection(connection)
if denied:
self.logger.debug(
'refused connection from %s due to the state machine' %
connection.name(), 'network')
break
self.logger.debug(
'accepted connection from %s' % connection.name(),
'network')
break
else:
# we did not break (and nothign was found/done or we have group match)
matched = len(ranged_neighbor)
if matched > 1:
self.logger.debug(
'could not accept connection from %s (more than one neighbor match)'
% connection.name(), 'network')
reactor.asynchronous.schedule(
str(uuid.uuid1()), 'sending notification (6,5)',
connection.notification(
6, 5,
'could not accept the connection (more than one neighbor match)'
))
return
if not matched:
self.logger.debug(
'no session configured for %s' % connection.name(),
'network')
reactor.asynchronous.schedule(
str(uuid.uuid1()), 'sending notification (6,3)',
connection.notification(
6, 3, 'no session configured for the peer'))
return
new_neighbor = copy.copy(ranged_neighbor[0])
new_neighbor.range_size = 1
new_neighbor.generated = True
new_neighbor.local_address = IP.create(connection.peer)
new_neighbor.peer_address = IP.create(connection.local)
if not new_neighbor.router_id:
new_neighbor.router_id = RouterID.create(connection.local)
new_peer = Peer(new_neighbor, reactor)
denied = new_peer.handle_connection(connection)
if denied:
self.logger.debug(
'refused connection from %s due to the state machine' %
connection.name(), 'network')
return
reactor.peers[new_neighbor.name()] = new_peer
return
def routerid(tokeniser):
return RouterID(tokeniser())
def new_connections (self):
if not self.serving:
return
yield None
reactor = self._reactor
ranged_neighbor = []
for connection in self._connected():
self.logger.debug('new connection received %s' % connection.name(),'network')
for key in reactor.peers:
peer = reactor.peers[key]
neighbor = peer.neighbor
connection_local = IP.create(connection.local).address()
neighbor_peer_start = neighbor.peer_address.address()
neighbor_peer_next = neighbor_peer_start + neighbor.range_size
if not neighbor_peer_start <= connection_local < neighbor_peer_next:
continue
connection_peer = IP.create(connection.peer).address()
neighbor_local = neighbor.local_address.address()
if connection_peer != neighbor_local:
if not neighbor.auto_discovery:
continue
# we found a range matching for this connection
# but the peer may already have connected, so
# we need to iterate all individual peers before
# handling "range" peers
if neighbor.range_size > 1:
ranged_neighbor.append(peer.neighbor)
continue
denied = peer.handle_connection(connection)
if denied:
self.logger.debug('refused connection from %s due to the state machine' % connection.name(),'network')
break
self.logger.debug('accepted connection from %s' % connection.name(),'network')
break
else:
# we did not break (and nothign was found/done or we have group match)
matched = len(ranged_neighbor)
if matched > 1:
self.logger.debug('could not accept connection from %s (more than one neighbor match)' % connection.name(),'network')
reactor.asynchronous.schedule(str(uuid.uuid1()), 'sending notification (6,5)', connection.notification(
6, 5, 'could not accept the connection (more than one neighbor match)'))
return
if not matched:
self.logger.debug('no session configured for %s' % connection.name(),'network')
reactor.asynchronous.schedule(str(uuid.uuid1()), 'sending notification (6,3)', connection.notification(
6, 3, 'no session configured for the peer'))
return
new_neighbor = copy.copy(ranged_neighbor[0])
new_neighbor.range_size = 1
new_neighbor.generated = True
new_neighbor.local_address = IP.create(connection.peer)
new_neighbor.peer_address = IP.create(connection.local)
new_neighbor.router_id = RouterID.create(connection.local)
new_peer = Peer(new_neighbor,self)
denied = new_peer.handle_connection(connection)
if denied:
self.logger.debug('refused connection from %s due to the state machine' % connection.name(),'network')
return
reactor.peers[new_neighbor.name()] = new_peer
return
def _operational(self, klass, parameters, tokens):
def utf8(string):
return string.encode('utf-8')[1:-1]
convert = {
'afi': AFI.value,
'safi': SAFI.value,
'sequence': int,
'counter': long,
'advisory': utf8
}
def valid(_):
return True
def u32(_):
return int(_) <= 0xFFFFFFFF
def u64(_):
return long(_) <= 0xFFFFFFFFFFFFFFFF
def advisory(_):
return len(_.encode('utf-8')) <= MAX_ADVISORY + 2 # the two quotes
validate = {
'afi': AFI.value,
'safi': SAFI.value,
'sequence': u32,
'counter': u64,
}
number = len(parameters) * 2
tokens = formated(tokens).split(' ', number - 1)
if len(tokens) != number:
return self.error.set(
'invalid operational syntax, wrong number of arguments')
data = {}
while tokens and parameters:
command = tokens.pop(0).lower()
value = tokens.pop(0)
if command == 'router-id':
if isipv4(value):
data['routerid'] = RouterID(value)
else:
self.error.set('invalid operational value for %s' %
command)
return None
continue
expected = parameters.pop(0)
if command != expected:
self.error.set(
'invalid operational syntax, unknown argument %s' %
command)
return None
if not validate.get(command, valid)(value):
self.error.set('invalid operational value for %s' % command)
return None
data[command] = convert[command](value)
if tokens or parameters:
self.error.set('invalid advisory syntax, missing argument(s) %s' %
', '.join(parameters))
return None
if 'routerid' not in data:
data['routerid'] = None
return klass(**data)
def router_id(tokeniser):
value = tokeniser()
try:
return RouterID(value)
except ValueError:
raise ValueError('"%s" is an invalid router-id' % value)
def __init__(self, version, asn, router_id, capabilities, hold_time):
self.version = Version(version)
self.asn = ASN(asn)
self.hold_time = HoldTime(hold_time)
self.router_id = RouterID(router_id)
self.capabilities = capabilities