114 lines
3.9 KiB
Python
114 lines
3.9 KiB
Python
from binascii import hexlify
|
|
import time
|
|
|
|
from addresses import calculateInventoryHash
|
|
from debug import logger
|
|
from inventory import Inventory
|
|
from network.dandelion import Dandelion
|
|
import protocol
|
|
import state
|
|
|
|
class BMObjectInsufficientPOWError(Exception):
|
|
errorCodes = ("Insufficient proof of work")
|
|
|
|
|
|
class BMObjectInvalidDataError(Exception):
|
|
errorCodes = ("Data invalid")
|
|
|
|
|
|
class BMObjectExpiredError(Exception):
|
|
errorCodes = ("Object expired")
|
|
|
|
|
|
class BMObjectUnwantedStreamError(Exception):
|
|
errorCodes = ("Object in unwanted stream")
|
|
|
|
|
|
class BMObjectInvalidError(Exception):
|
|
errorCodes = ("Invalid object")
|
|
|
|
|
|
class BMObjectAlreadyHaveError(Exception):
|
|
errorCodes = ("Already have this object")
|
|
|
|
|
|
class BMObject(object):
|
|
# max TTL, 28 days and 3 hours
|
|
maxTTL = 28 * 24 * 60 * 60 + 10800
|
|
# min TTL, 3 hour (in the past
|
|
minTTL = -3600
|
|
|
|
def __init__(self, nonce, expiresTime, objectType, version, streamNumber, data, payloadOffset):
|
|
self.nonce = nonce
|
|
self.expiresTime = expiresTime
|
|
self.objectType = objectType
|
|
self.version = version
|
|
self.streamNumber = streamNumber
|
|
self.inventoryHash = calculateInventoryHash(data)
|
|
# copy to avoid memory issues
|
|
self.data = bytearray(data)
|
|
self.tag = self.data[payloadOffset:payloadOffset+32]
|
|
|
|
def checkProofOfWorkSufficient(self):
|
|
# Let us check to make sure that the proof of work is sufficient.
|
|
if not protocol.isProofOfWorkSufficient(self.data):
|
|
logger.info('Proof of work is insufficient.')
|
|
raise BMObjectInsufficientPOWError()
|
|
|
|
def checkEOLSanity(self):
|
|
# EOL sanity check
|
|
if self.expiresTime - int(time.time()) > BMObject.maxTTL:
|
|
logger.info('This object\'s End of Life time is too far in the future. Ignoring it. Time is %i', self.expiresTime)
|
|
# TODO: remove from download queue
|
|
raise BMObjectExpiredError()
|
|
|
|
if self.expiresTime - int(time.time()) < BMObject.minTTL:
|
|
logger.info('This object\'s End of Life time was too long ago. Ignoring the object. Time is %i', self.expiresTime)
|
|
# TODO: remove from download queue
|
|
raise BMObjectExpiredError()
|
|
|
|
def checkStream(self):
|
|
if self.streamNumber not in state.streamsInWhichIAmParticipating:
|
|
logger.debug('The streamNumber %i isn\'t one we are interested in.', self.streamNumber)
|
|
raise BMObjectUnwantedStreamError()
|
|
|
|
def checkAlreadyHave(self):
|
|
# if it's a stem duplicate, pretend we don't have it
|
|
if Dandelion().hasHash(self.inventoryHash):
|
|
return
|
|
if self.inventoryHash in Inventory():
|
|
raise BMObjectAlreadyHaveError()
|
|
|
|
def checkObjectByType(self):
|
|
if self.objectType == protocol.OBJECT_GETPUBKEY:
|
|
self.checkGetpubkey()
|
|
elif self.objectType == protocol.OBJECT_PUBKEY:
|
|
self.checkPubkey()
|
|
elif self.objectType == protocol.OBJECT_MSG:
|
|
self.checkMessage()
|
|
elif self.objectType == protocol.OBJECT_BROADCAST:
|
|
self.checkBroadcast()
|
|
# other objects don't require other types of tests
|
|
|
|
def checkMessage(self):
|
|
return
|
|
|
|
def checkGetpubkey(self):
|
|
if len(self.data) < 42:
|
|
logger.info('getpubkey message doesn\'t contain enough data. Ignoring.')
|
|
raise BMObjectInvalidError()
|
|
|
|
def checkPubkey(self):
|
|
if len(self.data) < 146 or len(self.data) > 440: # sanity check
|
|
logger.info('pubkey object too short or too long. Ignoring.')
|
|
raise BMObjectInvalidError()
|
|
|
|
def checkBroadcast(self):
|
|
if len(self.data) < 180:
|
|
logger.debug('The payload length of this broadcast packet is unreasonably low. Someone is probably trying funny business. Ignoring message.')
|
|
raise BMObjectInvalidError()
|
|
|
|
# this isn't supported anymore
|
|
if self.version < 2:
|
|
raise BMObjectInvalidError()
|