def unwrap_envelope(envelope, key):
payload = envelope[:-hash_len]
expected_hmc = envelope[-hash_len:]
calculated_hmc = get_hmac(payload, key)
if not secretutils.constant_time_compare(expected_hmc, calculated_hmc):
LOG.warn(
_LW('calculated hmac: %(s1)s not equal to msg hmac: '
'%(s2)s dropping packet'), {
's1': to_hex(calculated_hmc),
's2': to_hex(expected_hmc)
})
fmt = 'calculated hmac: {0} not equal to msg hmac: {1} dropping packet'
raise exceptions.InvalidHMACException(
fmt.format(to_hex(calculated_hmc), to_hex(expected_hmc)))
obj = decode_obj(payload)
return obj
def dorecv(self, *args, **kw):
"""Waits for a UDP heart beat to be sent.
:return: Returns the unwrapped payload and addr that sent the
heartbeat.
"""
(data, srcaddr) = self.sock.recvfrom(UDP_MAX_SIZE)
LOG.debug('Received packet from %s', srcaddr)
try:
obj = status_message.unwrap_envelope(data, self.key)
except Exception as e:
LOG.warning('Health Manager experienced an exception processing a '
'heartbeat message from %s. Ignoring this packet. '
'Exception: %s', srcaddr, str(e))
raise exceptions.InvalidHMACException()
obj['recv_time'] = time.time()
return obj, srcaddr[0]
def get_payload(envelope, key, hex=True):
len = hex_hash_len if hex else hash_len
payload = envelope[:-len]
expected_hmc = envelope[-len:]
calculated_hmc = get_hmac(payload, key, hex=hex)
if not secretutils.constant_time_compare(expected_hmc, calculated_hmc):
LOG.warning(
'calculated hmac(hex=%(hex)s): %(s1)s not equal to msg hmac: '
'%(s2)s dropping packet', {
'hex': hex,
's1': to_hex(calculated_hmc),
's2': to_hex(expected_hmc)
})
fmt = 'calculated hmac: {0} not equal to msg hmac: {1} dropping packet'
raise exceptions.InvalidHMACException(
fmt.format(to_hex(calculated_hmc), to_hex(expected_hmc)))
obj = decode_obj(payload)
return obj
def dorecv(self, *args, **kw):
"""Waits for a UDP heart beat to be sent.
:return: Returns the unwrapped payload and addr that sent the
heartbeat. The format of the obj from the UDP sender
can be seen below. Note that listener_1 has no pools
and listener_4 has no members.
Example::
{
"listeners": {
"listener_uuid_1": {
"pools": {},
"status": "OPEN",
"stats": {
"conns": 0,
"rx": 0,
"tx": 0
}
},
"listener_uuid_2": {
"pools": {
"pool_uuid_1": {
"members": [{
"member_uuid_1": "DOWN"
},
{
"member_uuid_2": "DOWN"
},
{
"member_uuid_3": "DOWN"
},
{
"member_uuid_4": "DOWN"
}
]
}
},
"status": "OPEN",
"stats": {
"conns": 0,
"rx": 0,
"tx": 0
}
},
"listener_uuid_3": {
"pools": {
"pool_uuid_2": {
"members": [{
"member_uuid_5": "DOWN"
},
{
"member_uuid_6": "DOWN"
},
{
"member_uuid_7": "DOWN"
},
{
"member_uuid_8": "DOWN"
}
]
}
},
"status": "OPEN",
"stats": {
"conns": 0,
"rx": 0,
"tx": 0
}
},
"listener_uuid_4": {
"pools": {
"pool_uuid_3": {
"members": []
}
},
"status": "OPEN",
"stats": {
"conns": 0,
"rx": 0,
"tx": 0
}
}
},
"id": "amphora_uuid",
"seq": 1033
}
"""
(data, srcaddr) = self.sock.recvfrom(UDP_MAX_SIZE)
LOG.debug('Received packet from %s', srcaddr)
try:
obj = status_message.unwrap_envelope(data, self.key)
except Exception as e:
LOG.warning(
'Health Manager experienced an exception processing a '
'heartbeat message from %s. Ignoring this packet. '
'Exception: %s', srcaddr, e)
raise exceptions.InvalidHMACException()
obj['recv_time'] = time.time()
return obj, srcaddr