def unpack (cls,data,length):
if length != 4:
raise Notify(3,5, "Unable to decode attribute. Incorrect Size")
else:
b = BitArray(bytes=data)
colormask = b.unpack('uintbe:32')
return cls(colormask=colormask)
def unpack (cls,data,length):
if len(data) == 2:
# OSPF
igpmetric = unpack('!H',data)[0]
return cls(igpmetric=igpmetric)
elif len(data) == 1:
# ISIS small metrics
igpmetric = unpack('!B',data)[0]
return cls(igpmetric=igpmetric)
elif len(data) == 3:
# ISIS wide metrics
b = BitArray(bytes=data)
igpmetric = b.unpack('uintbe:24')
return cls(igpmetric=igpmetric)
else:
raise Notify(3,5, "Incorrect IGP Metric Size")
def unpack (cls,data,length):
igpflags = ['D', 'N', 'L', 'P']
if length > 1:
raise Notify(3,5, "IGP Flags TLV length too large")
else:
flag_array = binascii.b2a_hex(data[0])
hex_rep = hex(int(flag_array, 16))
bit_array = BitArray(hex_rep)
valid_flags = [''.join(item)+'0000' for item in itertools.product('01', repeat=4)]
valid_flags.append('0000')
if bit_array.bin in valid_flags:
flags = dict(zip(igpflags, bit_array.bin))
return cls(igpflags=flags)
else:
raise Notify(3,5, "Invalid IGP flags mask")
def unpack(cls, data, length):
node_flags = ['O', 'T', 'E', 'B', 'R', 'V', 'RSV', 'RSV']
if length > 1:
raise Notify(3, 5, "Node Flags TLV length too large")
else:
flag_array = binascii.b2a_hex(data[0])
hex_rep = hex(int(flag_array, 16))
bit_array = BitArray(hex_rep)
valid_flags = [
''.join(item) + '00'
for item in itertools.product('01', repeat=6)
]
valid_flags.append('0000')
if bit_array.bin in valid_flags:
flags = dict(zip(node_flags, bit_array.bin))
return cls(nodeflags=flags)
def unpack(cls, data, length):
protection_mask = [
'ExtraTrafic', 'Unprotected', 'Shared', 'Dedicated 1:1',
'Dedicated 1+1', 'Enhanced', 'RSV', 'RSV'
]
if length != 2:
raise Notify(3, 5, "Wrong size for protection type TLV")
else:
# We only care about the first octect
flag_array = binascii.b2a_hex(data[0])
hex_rep = hex(int(flag_array, 16))
bit_array = BitArray(hex_rep)
valid_flags = [
''.join(item) + '00'
for item in itertools.product('01', repeat=6)
]
valid_flags.append('0000')
if bit_array.bin in valid_flags:
flags = dict(zip(protection_mask, bit_array.bin))
return cls(protectionflags=flags)
def unpack(cls, data, length):
mpls_mask = [
'LDP', 'RSVP-TE', 'RSV', 'RSV', 'RSV', 'RSV', 'RSV', 'RSV'
]
if length > 1:
raise Notify(3, 5, "LINK TLV length too large")
else:
flag_array = binascii.b2a_hex(data[0])
hex_rep = hex(int(flag_array, 16))
bit_array = BitArray(hex_rep)
valid_flags = [
''.join(item) + '000000'
for item in itertools.product('01', repeat=2)
]
valid_flags.append('0000')
if bit_array.bin in valid_flags:
flags = dict(zip(mpls_mask, bit_array.bin))
return cls(mplsflags=flags)
else:
raise Notify(3, 5, "Invalid MPLS flags mask")
def unpack (cls,data,length): b = BitArray(bytes=data) return cls(areaid=b.hex)
def unpack_sysid(cls, data):
b = BitArray(bytes=data)
return b.hex