def handle_acks(self, packet_dict, pckt_id, response_packet, msg_type):
if (response_packet != None and Checksum.validate_checksum(response_packet)):
response = self.split_ack(response_packet)
msg_type = response[0]
ack_seqno = response[1]
# checks to see if we have a corrupted message type if were are not in sack mode.
if (msg_type != 'ack'):
return
# update the number of acks in the packet dictionary for each packet.
if (ack_seqno in packet_dict.keys()):
packet_dict[ack_seqno][2] += 1
# Handle duplicate acknowledgements. IF we have 3 acks for the same packet,
# we should retransmit only that specific packet.
if (ack_seqno in packet_dict.keys() and packet_dict[ack_seqno][2] >= 4):
self.retransmitOnlyPacket(packet_dict, ack_seqno)
# Handle correct ack by deleting the appropriate packets from the window.
elif (((int(ack_seqno) - int(pckt_id[0])) >= 1) and msg_type != 'end'):
diff = int(ack_seqno) - int(pckt_id[0]) # how many elements we should delete from dict/ lst.
packet_dict, pckt_id = self.delete_elems(diff, pckt_id, packet_dict)
# if ackqno == lowest packet number, then we have dropped that packet.
elif (int(ack_seqno) - int(pckt_id[0]) == 0):
self.retransmitPackets(packet_dict)
# Handle packet loss and corruption. If the ack is never received, or
# the checksum for the ack is invalid, we should retransmit the entire window.
elif(response_packet == None or (not Checksum.validate_checksum(response_packet))):
self.retransmitPackets(packet_dict)
def handle_sacks(self, packet_dict, pckt_id, response_pckt, msg_type, sack_lst):
if (response_pckt != None and Checksum.validate_checksum(response_pckt)):
response = self.split_sack(response_pckt)
msg_type = response[0] # msg_type
sack_seqno = response[1] # sack seqno
sack_lst = self.update_sack_lst(response[2], sack_lst) # updates the sack list.
if (msg_type != 'sack'):
return
if (sack_seqno in packet_dict.keys()):
packet_dict[sack_seqno][2] += 1
if (sack_seqno in packet_dict.keys() and packet_dict[sack_seqno][2] >= 4):
self.retransmitOnlyPacket(packet_dict, sack_seqno)
# Handle correct ack by deleting the appropriate packets from the window.
elif (((int(sack_seqno) - int(pckt_id[0])) >= 1) and msg_type != 'end'):
diff = int(sack_seqno) - int(pckt_id[0]) # how many elements we should delete from dict/ lst.
packet_dict, pckt_id = self.delete_elems(diff, pckt_id, packet_dict)
elif (int(sack_seqno) - int(pckt_id[0]) == 0):
self.retransmitSackPackets(packet_dict, response_pckt, sack_lst)
elif(response_pckt == None or (not Checksum.validate_checksum(response_pckt))):
self.retransmitPackets(packet_dict)
def handle_response(self,response):
if (response==None):
buffer=deque()
while (len(self.queue)!=0):
packet =self.queue.popleft()
self.send(packet)
buffer.append(packet)
while (len(buffer) !=0):
packet=buffer.popleft()
self.queue.append(packet)
response = self.receive(0.50)
self.handle_response(response)
elif Checksum.validate_checksum(response)==False:
return
elif Checksum.validate_checksum(response):
type1, seq ,data,checksum =self.split_packet(response)
if int(seq)-1 < self.unacknowledge:
if int(seq) < self.unacknowledge:
return
packet=self.queue.popleft()
self.send(packet)
self.queue.appendleft(packet)
response=self.receive(0.50)
self.handle_response(response)
else:
self.difference = int(seq)- self.unacknowledge
d=self.difference
while (d >0):
self.unacknowledge +=1
self.queue.popleft()
d -=1
def paytm_request(request, token):
teamcaptain = TeamCaptain.objects.get(payment_token=token)
MERCHANT_KEY = settings.PAYTM_MERCHANT_KEY
MERCHANT_ID = settings.PAYTM_MERCHANT_ID
CALLBACK_URL = settings.HOST_URL + settings.PAYTM_CALLBACK_URL
# Generating unique temporary ids
order_id = Checksum.__id_generator__()
teamcaptain.order_id = order_id
teamcaptain.save()
bill_amount = teamcaptain.event.price
name = str(teamcaptain.name) + ' ' + str(teamcaptain.event.name)
if bill_amount:
data_dict = {
'MID': MERCHANT_ID,
'ORDER_ID': order_id,
'TXN_AMOUNT': bill_amount,
'CUST_ID': 'Cust002',
'INDUSTRY_TYPE_ID': 'Retail',
'WEBSITE': 'DIYtestingweb', #testing phase
'CHANNEL_ID': 'WEB',
'CALLBACK_URL': CALLBACK_URL,
}
param_dict = data_dict
param_dict['CHECKSUMHASH'] = Checksum.generate_checksum(
data_dict, MERCHANT_KEY)
print param_dict
return render(request, "registrations/payment.html",
{'paytmdict': param_dict})
return HttpResponse("Bill Amount Error.")
def handle_response(self, response):
if (response == None):
buffer = deque()
while (len(self.queue) != 0):
packet = self.queue.popleft()
self.send(packet)
buffer.append(packet)
while (len(buffer) != 0):
packet = buffer.popleft()
self.queue.append(packet)
response = self.receive(0.50)
self.handle_response(response)
elif Checksum.validate_checksum(response) == False:
return
elif Checksum.validate_checksum(response):
type1, seq, data, checksum = self.split_packet(response)
if int(seq) - 1 < self.unacknowledge:
if int(seq) < self.unacknowledge:
return
packet = self.queue.popleft()
self.send(packet)
self.queue.appendleft(packet)
response = self.receive(0.50)
self.handle_response(response)
else:
self.difference = int(seq) - self.unacknowledge
d = self.difference
while (d > 0):
self.unacknowledge += 1
self.queue.popleft()
d -= 1
def payment(request):
MERCHANT_KEY = settings.PAYTM_MERCHANT_KEY
MERCHANT_ID = settings.PAYTM_MERCHANT_ID
get_lang = "/" + get_language() if get_language() else ''
CALLBACK_URL = settings.HOST_URL + get_lang + settings.PAYTM_CALLBACK_URL
# Generating unique temporary ids
order_id = Checksum.__id_generator__()
bill_amount = request.GET.get("bill_amount")
if bill_amount:
data_dict = {
'MID': MERCHANT_ID,
'ORDER_ID': order_id,
'TXN_AMOUNT': bill_amount,
'CUST_ID': '*****@*****.**',
'INDUSTRY_TYPE_ID': 'Retail',
'WEBSITE': 'WEB_STAGING',
'CHANNEL_ID': 'WEB',
'CALLBACK_URL': CALLBACK_URL,
}
param_dict = data_dict
param_dict['CHECKSUMHASH'] = Checksum.generate_checksum(
data_dict, MERCHANT_KEY)
return render(request, "paytm/payment.html", {'paytmdict': param_dict})
return HttpResponse("Bill Amount Could not find. ?bill_amount=10")
def main(f1, f2):
checksum1 = Checksum.hasfile(f1)
checksum2 = Checksum.hasfile(f2)
if checksum1 == checksum2:
print("Success: Same contents")
else:
print("Failure: Do not have same contents..")
def create_rf_command_datagram(dest_callsign, dest_device_id, command,
payload):
"""
This function creates a command packet datagram for commanding REMOTE (RF) Faraday devices. This datagram encapsulates the actual command packets to the passed to the remote device as a payload.
The important difference between the RF and non RF command packet functions are remote callsign and ID arguments that tell Faraday what devices to target for commanding.
.. note:: Remote commanding simply calls a specific local command that transmits a "local" command packet as a payload to the target Faraday device. Also, This command module has a predefined set of command number definitions for use/reference.
:param dest_callsign: The callsign of the target Faraday unit
:param dest_device_id: The device ID number of the target Faraday unit
:param command: The command "number" that identifies the command packet to be parsed or direct action to be taken
:param payload: The payload for the specified command packet type. This is usually just commands full "packet" structure
:return: A complete command datagram packet as a string of raw bytes
"""
#Cheack if callsign is too long
if len(dest_callsign) < DEST_CALLSIGN_MAX_LEN:
#Define packet structures
pkt_cmd_datagram_struct = struct.Struct(
'2B25s'
) #Command packect to be run on remote unit as local command
pkt_cmd_datagram_error_detection_struct = struct.Struct(
'>1H'
) #Command packect to be run on remote unit as local command Error Detection
pkt_rf_cmd_struct = struct.Struct(
'9s2B29s'
) #RF Command packet that encapsulates local command to be run on remote unit
pkt_rf_error_detection_struct = struct.Struct(
'>1H') #16bit Error Detection (Checksum)
#Create local command for remote unit
pkt_cmd_datagram = pkt_cmd_datagram_struct.pack(
command, len(payload), payload)
pkt_cmd_datagram_error_detection = pkt_cmd_datagram_error_detection_struct.pack(
checksum.compute_checksum_16(pkt_cmd_datagram,
len(pkt_cmd_datagram)))
pkt_cmd_datagram_final = pkt_cmd_datagram + pkt_cmd_datagram_error_detection
print repr(pkt_cmd_datagram_final)
#Create RF Command for local device without Error Detection appended. NOTE Callsign must be in uppercase!
pkt_rf_cmd = pkt_rf_cmd_struct.pack(
str(dest_callsign).upper(), len(dest_callsign), dest_device_id,
pkt_cmd_datagram_final)
#Create final local command packet with Error Detection appeneded
pkt_rf_error_detection = pkt_rf_error_detection_struct.pack(
checksum.compute_checksum_16(pkt_rf_cmd, len(pkt_rf_cmd)))
packet = pkt_rf_cmd + pkt_rf_error_detection
return packet
else:
print "Error: Callsign too long!"
def notCurrupted(rcvpkt):
data = rcvpkt[1]
#print(data)
checksum = rcvpkt[2]
rcvDataCheck = c.CHECK(data)
result = c.binaryAddition(rcvDataCheck, checksum)
length = len(result)
for i in range(0, length):
if (result[i] != "1"):
return False
break
return True
def start(self):
packets_data = self.split_file(self.infile.read())
#handshake
#for jobia magram testebistvis while iyos :)
while True:
self.send(self.make_packet('syn', -1, ''))
ack = self.receive(0.5)
if ack is None: continue
_, seqno, _, _ = self.split_packet(ack)
break
idx = 0
WINDOW = dict()
while idx < len(packets_data):
for i in range(idx, idx + 7):
if i >= len(packets_data): break
if WINDOW.get(i, False): continue
self.send(self.make_packet('dat', i, packets_data[i]))
Fast = dict()
while True:
ack_data = self.receive(0.5)
if ack_data is None: break
_, seqno, _, _ = self.split_packet(ack_data)
if str(seqno).__contains__(';'): #SACK
ls = seqno.split(';')
WINDOW[int(ls[0]) -
1] = Checksum.validate_checksum(ack_data)
if WINDOW[int(ls[0]) - 1]: idx = max(idx, int(ls[0]))
if ls[0] in Fast: Fast[ls[0]] += 1
else: Fast[ls[0]] = 1
if Fast[ls[0]] > 3:
idx = int(ls[0])
print('fast1')
break
if ls[1].__contains__(',') and WINDOW[int(ls[0]) - 1]:
for num in ls[1].split(','):
WINDOW[int(num)] = True
elif len(ls[1]) == 1 and WINDOW[int(ls[0]) - 1]:
WINDOW[int(ls[1])] = True
else: #ACK
if seqno in Fast: Fast[seqno] += 1
else: Fast[seqno] = 1
if Fast[seqno] > 3:
idx = int(seqno)
print('fast1')
break
WINDOW[int(seqno) -
1] = Checksum.validate_checksum(ack_data)
if WINDOW[int(seqno) - 1]: idx = max(idx, int(seqno))
self.send(self.make_packet('fin', idx, ''))
def start(self):
initialSeqNo = 0
print self.packets
startData = self.infile.read(self.dataSize)
firstPacket = self.make_packet("start", initialSeqNo, startData)
self.packets[0] = firstPacket
self.send(firstPacket)
startTime = time.clock()
while (True):
response = self.receive(.5 - (time.clock()-startTime))
if response is None:
self.send(firstPacket)
startTime = time.clock()
elif Checksum.validate_checksum(response):
break
self.base = 1
for i in range(1, self.N):
data = self.infile.read(self.dataSize)
if len(data) < self.dataSize:
packet = self.make_packet("end", i, data)
self.packets[i] = packet
self.lastSeqNo = i
self.send(packet)
break
else:
packet = self.make_packet("data", i, data)
self.packets[i] = packet
self.send(packet)
startTime = time.clock()
while True:
receivedPacket = self.receive(.5 - (time.clock() - startTime))
if receivedPacket is None:
self.handle_timeout()
elif not Checksum.validate_checksum(receivedPacket):
pass
else:
msgType, seqNoStr, data, checkSum = self.split_packet(receivedPacket)
seqNo = int(seqNoStr)
if seqNo == self.lastSeqNo+1:
break
if not seqNo in self.acks:
self.acks[seqNo] = 1
self.handle_new_ack(seqNo)
else:
self.acks[seqNo] += 1
self.handle_dup_ack(seqNo)
def notCurrupted(rcvpkt):
data = rcvpkt[0]
#print(data)
checksum = rcvpkt[1]
rcvDataCheck = c.CHECK(data)
result = c.binaryAddition(rcvDataCheck, checksum)
length = len(result)
for i in range(0, length):
if (result[i] != "1"):
#print("Acknowledgement is not currupted")
return False
break
#print("Acknowledgement is not currupted")
return True
def start(self):
while not self.should_stop_transmission:
if not self.end_reached:
self.send__fill_the_window(5 - len(self.sending_window),
len(self.sending_window))
response = self.receive(0.5)
if response and Checksum.validate_checksum(response):
response_type, ack_num_str, data, checksum = self.split_packet(
response)
if response_type == "sack":
#print "SACK got!"
#print ack_num_str
ack_num = int(ack_num_str.split(';')[0])
self.received = ack_num_str.split(';')[1].split(',')
else:
ack_num = int(ack_num_str)
self.check_for_stop(ack_num)
#checks for out of order acks
#if ack_num is smaller than current window, then better ignore it, but we didn't
if ack_num - self.window_start_number > 0:
self.handle_new_ack(ack_num)
else:
self.handle_dup_ack(ack_num)
else:
self.handle_timeout(self.received)
self.infile.close()
def _initialize_connection(self, retry_count): #print "WHY HELLO THERE" #Three Way Handshake if retry_count > 0: #Fields of the packet msg_type = 'start' msg = "" #Create and send the initlization packet start_packet = self.make_packet(msg_type, self.isn, msg) self.send(start_packet) #Wait 500ms to receive the packet response = self.receive(timeout=self.timeout) if response: if Checksum.validate_checksum(response): #Good Packet! msg_type, seqno, data, checksum = self.split_packet(response) ack = int(seqno) if msg_type == "ack" and ack == self.isn: self.send_base = self.isn + 1 return True else: return self._initialize_connection(retry_count - 1) else: #Not good packet! return self._initialize_connection(retry_count - 1) else: #Timeout return self._initialize_connection(retry_count - 1) else: #Could not connect return False
def _tear_down_connection(self, retry_count): #print "TEAR DOWN THIS WALL" if retry_count > 0: #Fields of the packet msg_type = 'end' msg = "" #Create and send the tear down packet tear_down_packet = self.make_packet(msg_type, self.send_base, msg) self.send(tear_down_packet) #Wait 500ms to receive the packet response = self.receive(timeout=self.timeout) if response: if Checksum.validate_checksum(response): #Good Packet! msg_type, seqno, data, checksum = self.split_packet(response) seqno = int(seqno) if seqno == self.send_base and msg_type == "ack": return True else: #Wrong SEQ NO EXPECTED return self._tear_down_connection(retry_count - 1) else: #Not good packet! return self._tear_down_connection(retry_count - 1) else: #Timeout return self._tear_down_connection(retry_count - 1) else: #Could not tear down packet. Should we just stop sending messages? return False
def handle_response(self, response_packet):
if Checksum.validate_checksum(response_packet):
print "recv: %s" % response_packet
return True
else:
print "recv: %s <--- CHECKSUM FAILED" % response_packet
return False
def handle_response(self, response):
if response == None:
self.handle_timeout()
# elif Checksum.validate_checksum(response) == False:
# # print "recv: %s <--- CHECKSUM FAILED" % response
elif Checksum.validate_checksum(response):
msgtype, ack_str, data, checksum = self.split_packet(response)
if sackMode:
split = ack_str.split(';')
ack = int(split[0])
else:
ack = int(ack_str)
if ack < self.acktracker:
# print ("rcv: buggy ack")
response = self.receive(0.50)
if self.printstatements:
print response
self.handle_response(response)
elif ack == self.acktracker:
self.handle_dup_ack(ack_str)
elif ack > self.acktracker:
self.handle_new_ack(ack_str)
def hand_shake(self):
# Create a syn packet with the random initial sequence number
syn_packet = self.make_packet(MSG_TYPE_SYN, self.sequence_number, PACKET_BODY_EMPTY)
# Prepare to receive
ack_packet = None
ack_msg_type = None
ack_sequence_number = None
# We want to populate ack_packet, make sure the response message type is ack,
# and check that the sequence number is the self.sequence_number + 1
while not ack_packet and ack_msg_type != MSG_TYPE_ACK and ack_sequence_number != self.sequence_number + 1:
# Send the packet
self.send(syn_packet)
# After sending the synmessage, the sender waits for an ackpacket to finish a handshake
ack_packet = self.receive(RETRANSMISSION_TIME)
if ack_packet:
# Split apart the packet
components = self.packet_components(ack_packet)
ack_msg_type = components[PACKET_COMPONENT_MSG_TYPE]
ack_sequence_number = int(components[PACKET_COMPONENT_SEQUENCE_NUMBER])
# Validate the checksum
valid_checksum = Checksum.validate_checksum(ack_packet)
if not valid_checksum:
ack_packet = None
def _listen_for_acks(self): self.time_til_timeout = self.timeout while True: #Always listen for acks start_time = datetime.now() response = self.receive(timeout=self.time_til_timeout) end_time = datetime.now() delta = end_time - start_time time_elapsed = delta.seconds + delta.microseconds/1E6 self.time_til_timeout = max(self.time_til_timeout - time_elapsed, 0) #print self.time_til_timeout if response: if Checksum.validate_checksum(response): #Good Packet! msg_type, seqno, data, checksum = self.split_packet(response) if msg_type != "ack": continue ack = int(seqno) if ack < self.send_base: continue if self.handle_new_ack(ack): return else: #Not good packet! Listen for acks again pass else: #TIMEOUT! self.handle_timeout()
def hand_shake(self):
# Create a syn packet with the random initial sequence number
syn_packet = self.make_packet(MSG_TYPE_SYN, self.sequence_number,
PACKET_BODY_EMPTY)
# Prepare to receive
ack_packet = None
ack_msg_type = None
ack_sequence_number = None
# We want to populate ack_packet, make sure the response message type is ack,
# and check that the sequence number is the self.sequence_number + 1
while not ack_packet and ack_msg_type != MSG_TYPE_ACK and ack_sequence_number != self.sequence_number + 1:
# Send the packet
self.send(syn_packet)
# After sending the synmessage, the sender waits for an ackpacket to finish a handshake
ack_packet = self.receive(RETRANSMISSION_TIME)
if ack_packet:
# Split apart the packet
components = self.packet_components(ack_packet)
ack_msg_type = components[PACKET_COMPONENT_MSG_TYPE]
ack_sequence_number = int(
components[PACKET_COMPONENT_SEQUENCE_NUMBER])
# Validate the checksum
valid_checksum = Checksum.validate_checksum(ack_packet)
if not valid_checksum:
ack_packet = None
def handle_dup_ack(self, ack):
# invalid checksum
if not Checksum.validate_checksum(ack):
pass
msg_type, seqno, data, checksum = self.split_packet(ack)
if int(seqno) > self.window[0]:
self.send(self.s_window[seqno])
def shop():
name = request.form['name']
email = request.form['email']
blog_id = request.form['blog_id']
amount = request.form['amount']
orderid = str(random.randint(1, 2000))
paymentemail[orderid] = email
paymentblog[orderid] = blog_id
# password1=request.form['password1']
# password2=request.form['password2']
# print(name,email,paytmno,amount)
deepak_dict = {
'MID': MERCHANT_ID,
'ORDER_ID': orderid,
'TXN_AMOUNT': str(amount),
'CUST_ID': email,
'INDUSTRY_TYPE_ID': 'Retail',
'WEBSITE': 'WEBSTAGING',
'CHANNEL_ID': 'WEB',
'CALLBACK_URL': 'http://localhost:5000/shop/handlerequest/',
}
deepak_dict['CHECKSUMHASH'] = Checksum.generate_checksum(
deepak_dict, MERCHANT_KEY)
print(deepak_dict)
return render_template('payment/paytm.html', deepak_dict=deepak_dict)
def slide_window(self, ack, received_packets):
num_to_read = 0
if ack is None:
num_to_send = self.window_size
else:
_, raw_seqno, _, _ = self.split_packet(ack)
seqno = int(raw_seqno.split(';', 1)[0])
if seqno <= self.truly_received:
num_to_send = 0
elif not Checksum.validate_checksum(ack):
num_to_send = 1 #0
else:
if self.sackMode:
received_packets_indices = [
int(packet) for packet in raw_seqno.split(';', 1)[1].split(',') if packet
]
for index in received_packets_indices:
received_packets[index - 1] = True
self.ack_counter[seqno] += 1
if self.ack_counter[seqno] == self.fast_retransmit_limit:
num_to_send = 1
self.ack_counter[seqno] = 0
# num_to_send = self.window_size
# for i in xrange(self.truly_received + 1, self.truly_received + self.window_size + 1):
# self.ack_counter[i] = 0
else:
num_to_read = seqno - 1 - self.truly_received
num_to_send = num_to_read #self.window_size
self.truly_received = seqno - 1
return num_to_read, num_to_send
def start(self):
while True:
try:
# Receive the message and where it came from
message, address = self.receive()
# Split the message up into it's appropriate parts
msg_type, seqno, data, checksum = self._split_message(message)
if debug:
print('Received message: {0} {1} {2} {3} {4}'.format(
msg_type, seqno, data, sys.getsizeof(data), checksum))
if Checksum.validate_checksum(message):
# If the checksum checks out, handle the message using one of the following methods defined by the
# MESSAGE_HANDLER dictionary.
self.MESSAGE_HANDLER.get(msg_type,
self._handle_other)(seqno, data,
address)
elif self.debug:
print("checksum failed: %s" % message)
# If the timeout happens, do a cleanup.
if time.time() - self.last_cleanup > self.timeout:
self._cleanup()
except socket.timeout:
self._cleanup()
except (KeyboardInterrupt, SystemExit):
exit()
except ValueError as e:
if self.debug:
print(e)
pass # ignore
def handle_response(self,response_packet,sendNext):
if Checksum.validate_checksum(response_packet):
print "recv: %s" % response_packet
else:
print "recv: %s <--- CHECKSUM FAILED" % response_packet
sendNext = False
def handle_corrupted_response(self, packet, response_packet):
response = response_packet
while Checksum.validate_checksum(response) == False:
print "Resending packet..."
self.send(packet)
response = self.receive(2.0)
self.handle_response(response)
def findDups(path):
flag = os.path.isabs(path)
if flag == False:
path = os.path.abspath(path)
exists = os.path.exists(path)
if exists:
dupsfilesDic = {}
startTime = datetime.now().strftime('%Y-%m-%d_%H-%M-%S')
totalFiles = 0
dupFiles = 0
for dirName, subDir, files in os.walk(path):
for fname in files:
totalFiles = len(files)
fname = os.path.join(dirName, fname)
file_hash = Checksum.hashfile(fname)
if file_hash in dupsfilesDic:
dupsfilesDic[file_hash].append(fname)
dupFiles += 1
else:
dupsfilesDic[file_hash] = [fname]
return dupsfilesDic, startTime, totalFiles, dupFiles
else:
print("Invalid path")
def check_packet(self, r_pck):
if self.sackMode:
pieces = r_pck.split('|')
seqnums = pieces[1]
sackpieces = seqnums.split(';')
seqno = int(sackpieces[0])
sack_str = sackpieces[1]
sacks = []
if sack_str != '':
sack_str = sackpieces[1].split(',')
for i in sack_str:
sacks.append(int(i))
return seqno, Checksum.validate_checksum(r_pck), sacks
else:
seqno = self.get_seq(r_pck)
return seqno, Checksum.validate_checksum(r_pck), []
def validate(param_dict, merchant_key):
if 'CHECKSUMHASH' not in param_dict:
return False
checksum = param_dict.pop('CHECKSUMHASH')[0]
return Checksum.verify_checksum(param_dict=param_dict,
merchant_key=merchant_key,
checksum=checksum)
def start(self):
msg_type=None
while not len(self.window)==self.max_size:
msg=self.infile.read(1372)
if self.seq_no==0:
msg_type='start'
elif msg=="":
msg_type='end'
else:
msg_type='data'
packet=self.make_packet(msg_type,self.seq_no,msg)
self.send(packet)
self.window[self.seq_no]=packet
self.seq_no+=1
while (not self.end) or (not len(self.window)==0):
ack=self.receive(0.5)
if ack==None:
self.handle_timeout()
elif Checksum.validate_checksum(ack):
msg_type,seq_no,data,checksum=self.split_packet(ack)
if self.last_ack_num==0:
self.last_ack_num=int(seq_no)
self.last_ack=ack
self.handle_new_ack(ack,int(seq_no))
elif int(seq_no)==self.last_ack_num:
self.handle_dup_ack(ack,int(seq_no))
else:
self.handle_new_ack(ack,int(seq_no))
else:
self.send(self.window[self.last_ack_num])
self.seq_no=0
self.last_ack_num=0
self.last_ack=None
self.end=False
def checkresponse(self, resp, minack= 0, maxack= 1):
""" Helper. Checks if the ack packet is not
corrupted and that the seqno in the ack is
the next seqno. Also checks if resp is null or Ack is non-int."""
# response is nil, not a valid response
if not resp:
return False
# get the pieces of the response packet
spacket = self.split_packet(resp)
msg_type, ackno = spacket[0], spacket[1]
# msgs from receiver should only be of type 'ack'
if msg_type != 'ack':
return False
#if ackno is not an int, exit
try:
ackno = int(ackno)
except ValueError:
return False
# keep track of dupacks to resend lost packet(s)
if ackno == minack:
self.dupacks += 1
else:
self.dupacks = 0
# make sure checksum is valid, and the ackno is in the sequence of acknos we are expecting
return Checksum.validate_checksum(resp) and ackno > minack and ackno <= maxack
def initiate_conversation(self):
for i in range(1, self.windowSize + 1):
msg = self.infile.read(500)
self.buffer[i] = msg
# End of file has been read.
if msg == "":
# Empty msg, need to send empty start and end packets.
if i == 1:
self.buffer[i + 1] = ""
self.last_seqno = i + 1
else:
self.last_seqno = i
self.segmented_all_file = True
self.infile.close()
break
# Will break out if we get a valid ack
received_valid_ack = False
while not received_valid_ack:
# Will keep sending all the packets in the first window, except the end packet.
for i in range(1, len(self.buffer.keys()) + 1):
if i == 1:
msg_type = "start"
elif i == len(self.buffer.keys()):
break
else:
msg_type = "data"
packet = self.make_packet(msg_type, i, self.buffer[i])
self.send(packet)
self.packets_in_transit += 1
response = self.receive(0.5)
received_valid_ack = response != None and Checksum.validate_checksum(response)
self.handle_response(response)
def update_packet(self, msg_type=None, seqno=None, data=None, full_packet=None, update_checksum=True):
"""
This function handles safely changing the contents of a packet. By
default, we re-compute the checksum every time the packet is updated.
However, you can disable this if you intend to create a corrupted
packet.
Note that the checksum is calculated over the NON-0-indexed sequence number.
"""
if not self.bogon:
if msg_type == None:
msg_type = self.msg_type
if seqno == None:
seqno = self.seqno
if data == None:
data = self.data
if msg_type == "ack": # doesn't have a data field, so handle separately
body = "%s|%d|" % (msg_type, seqno)
checksum_body = "%s|%d|" % (msg_type, seqno + self.start_seqno_base)
else:
body = "%s|%d|%s|" % (msg_type, seqno, data)
checksum_body = "%s|%d|%s|" % (msg_type, seqno + self.start_seqno_base, data)
if update_checksum:
checksum = Checksum.generate_checksum(checksum_body)
else:
checksum = self.checksum
self.msg_type = msg_type
self.seqno = seqno
self.data = data
self.checksum = checksum
if full_packet:
self.full_packet = full_packet
else:
self.full_packet = "%s%s" % (body, checksum)
def handle_dup_ack(self, ack):
# invalid checksum
if not Checksum.validate_checksum(ack):
pass
msg_type, seqno, data, checksum = self.split_packet(ack)
if int(seqno) > self.window[0]:
self.send(self.s_window[seqno])
def handle_response(self,response_packet):
if Checksum.validate_checksum(response_packet):
msg_type, seqno, data, checksum = self.split_packet(response_packet)
print(type(seqno))
print "recv: %s" % response_packet
else:
print "recv: %s <--- CHECKSUM FAILED" % response_packet
def recvMyACKs(self):
ACKlist = []
currentACK = self.receive(0.5)
while currentACK != None: # If we get something, then check CHECKSUM
temp = currentACK.split("|")
if not (len(temp) == 3 and temp[1].isdigit() and temp[2].isdigit() and temp[0] == "ack"): # ignore
if self.DEBUG:
print "Disregarding corrupted packet: %s" % currentACK
currentACK = self.receive(0.5)
continue
if Checksum.validate_checksum(currentACK):
msg_type, seqno, checksum = currentACK.split('|')
ACKlist.append(seqno) #put the next expected packet number in the list
elif self.DEBUG:
print "Received corrupted packet. Disregarding."
#wait for next packet
currentACK = self.receive(0.5)
ACKlist = map(int, ACKlist)
if self.DEBUG:
print "Received %d ACK's: %s. Highest is %d: the receiver has everything to %d" % (len(ACKlist), ACKlist, max(ACKlist) if ACKlist else -1, max(ACKlist)-1 if ACKlist else -1)
# No ACKs to be received. Act accordingly.
if ACKlist:
for key in self.packetList.keys(): # Cleaning up packets stored
if key < max(ACKlist) and len(self.packetList) > 1:
del self.packetList[key]
return ACKlist
def handle_response(self,response):
if response == None:
self.handle_timeout()
# elif Checksum.validate_checksum(response) == False:
# # print "recv: %s <--- CHECKSUM FAILED" % response
elif Checksum.validate_checksum(response):
msgtype, ack_str, data, checksum = self.split_packet(response)
if sackMode:
split = ack_str.split(';')
ack = int(split[0])
else:
ack = int(ack_str)
if ack < self.acktracker:
# print ("rcv: buggy ack")
response = self.receive(0.50)
if self.printstatements:
print response
self.handle_response(response)
elif ack == self.acktracker:
self.handle_dup_ack(ack_str)
elif ack > self.acktracker:
self.handle_new_ack(ack_str)
def start(self):
while not self.should_stop_transmission:
if not self.end_reached:
self.send__fill_the_window(5 - len(self.sending_window), len(self.sending_window))
response = self.receive(0.5)
if response and Checksum.validate_checksum(response):
response_type, ack_num_str, data, checksum = self.split_packet(response)
if response_type == "sack":
#print "SACK got!"
#print ack_num_str
ack_num = int(ack_num_str.split(';')[0])
self.received = ack_num_str.split(';')[1].split(',')
else:
ack_num = int(ack_num_str)
self.check_for_stop(ack_num)
#checks for out of order acks
#if ack_num is smaller than current window, then better ignore it, but we didn't
if ack_num - self.window_start_number > 0:
self.handle_new_ack(ack_num)
else:
self.handle_dup_ack(ack_num)
else:
self.handle_timeout(self.received)
self.infile.close()
def handlerequest():
# paytm will send you post request here
form = request.form.to_dict()
response_dict = {}
for i in form.keys():
response_dict[i] = form[i]
if i == 'CHECKSUMHASH':
checksum = form[i]
with open("invoice.json", "r") as read:
myjsonread = json.load(read)
mymain = myjsonread
verify = Checksum.verify_checksum(response_dict, MERCHANT_KEY, checksum)
if verify:
if response_dict['RESPCODE'] == '01':
# print('order successful')
with open("invoice.json", "w") as write:
myjsonread[str(form["ORDERID"])]["status"] = "Paid"
myjsonread[str(form["ORDERID"])]["pmode"] = "Paytm"
try:
myjsonread[str(form["ORDERID"])]["transid"] = str(
form["ORDERID"])
except:
pass
try:
json.dump(myjsonread, write)
except:
json.dump(mymain, write)
write.close()
else:
# print('order was not successful because' + response_dict['RESPMSG'])
pass
return render_template('paymentstatus.html', response=response_dict)
def checkresponse(self, resp, minack=0, maxack=1):
""" Helper. Checks if the ack packet is not
corrupted and that the seqno in the ack is
the next seqno. Also checks if resp is null or Ack is non-int."""
# response is nil, not a valid response
if not resp:
return False
# get the pieces of the response packet
spacket = self.split_packet(resp)
msg_type, ackno = spacket[0], spacket[1]
# msgs from receiver should only be of type 'ack'
if msg_type != 'ack':
return False
#if ackno is not an int, exit
try:
ackno = int(ackno)
except ValueError:
return False
# keep track of dupacks to resend lost packet(s)
if ackno == minack:
self.dupacks += 1
else:
self.dupacks = 0
# make sure checksum is valid, and the ackno is in the sequence of acknos we are expecting
return Checksum.validate_checksum(
resp) and ackno > minack and ackno <= maxack
def update_packet(self, msg_type=None, seqno=None, data=None, full_packet=None, update_checksum=True):
"""
This function handles safely changing the contents of a packet. By
default, we re-compute the checksum every time the packet is updated.
However, you can disable this if you intend to create a corrupted
packet.
Note that the checksum is calculated over the NON-0-indexed sequence number.
"""
if not self.bogon:
if msg_type == None:
msg_type = self.msg_type
if seqno == None:
seqno = self.seqno
if data == None:
data = self.data
if msg_type == "ack": # doesn't have a data field, so handle separately
body = "%s|%d|" % (msg_type, seqno)
checksum_body = "%s|%d|" % (msg_type, seqno + self.start_seqno_base)
else:
body = "%s|%d|%s|" % (msg_type,seqno,data)
checksum_body = "%s|%d|%s|" % (msg_type, seqno + self.start_seqno_base, data)
if update_checksum:
checksum = Checksum.generate_checksum(checksum_body)
else:
checksum = self.checksum
self.msg_type = msg_type
self.seqno = seqno
self.data = data
self.checksum = checksum
if full_packet:
self.full_packet = full_packet
else:
self.full_packet = "%s%s" % (body,checksum)
def start(self):
# NOTE: Packet payload size should be larger than 1000 bytes (unless it is the last packet in the stream)
# but less than 1472 bytes.
msg_type = None
while not self.done_sending:
# Repeatedly send packets until our window is full or until our chunking is complete (i.e. msg_type == false)
while not self.window.window_is_full() and self.is_chunking_done is False:
# Send the next packet chunk and return a boolean that represents whether we are done chunking
self.is_chunking_done = self.send_next_packet_chunk()
if self.is_chunking_done:
msg_type = 'end'
# Receive an ACK from the Receiver
packet_response = self.receive(0.5)
# If we haven't received a response in 500ms, then handle timeout
if (packet_response == None):
self.handle_timeout()
else:
# Via the spec, we ignore all ACK packets with an invalid checksum
if Checksum.validate_checksum(packet_response):
msg_type, seqno, data, checksum = self.split_packet(packet_response)
if self.sackMode:
seqno = int(seqno.split(";")[0])
# For some reason, 'seqno' is returned as a string... so we parse it into an integer
else:
seqno = int(seqno)
# Do ACKs have data? Probably not?
if (self.debug):
print("Received packet: %s | %d | %s | %s" % (msg_type, seqno, data, checksum))
# Put the current sequence number in our <sequence number -> ACKs> map, given some conditions
# If we haven't seen the current ACK before
if not self.window.is_seqno_contained_in_ack_map(seqno):
self.handle_new_ack(seqno)
# Current sequence number is NOT already contained within our map...
else:
# Increment the number of ACKs (for seqno) by 1
self.window.add_acks_count_to_map(seqno, self.window.get_ack_number_via_seqno(seqno) + 1)
# Algorithm: If ACK count is 3, then we use fast retransmit and resend the seqno with count == 3
if (self.window.get_ack_number_via_seqno(seqno) == 3):
self.handle_dup_ack(seqno)
else:
# Ignore ACKs with invalid checksum
# Do we need to handle_timeout() if we receive an ACK with an invalid checksum?
self.handle_timeout()
pass
# Declare that we are done sending if our window is empty AND we are done chunking
if (self.window.get_number_of_packets_in_window() == 0 and self.is_chunking_done is True):
self.done_sending = True
def start(self):
print("===== Welcome to BEARDOWN-TP Receiver v2.0! =====")
print("* Listening on port %d..." % self.port)
while True:
try:
# message, address = self.receive()
message_bytes, address = self.receive()
message = message_bytes.decode()
msg_type, seqno, data, checksum = self._split_message(message)
try:
seqno = int(seqno)
except:
raise ValueError
if debug:
print("%s %d %s %s" % (msg_type, seqno, data, checksum))
if Checksum.validate_checksum(message):
# print("msg_type: %s" % msg_type)
# print("data: %s" % data)
self.MESSAGE_HANDLER.get(msg_type,
self._handle_other)(seqno, data,
address)
elif self.debug:
print("checksum failed: %s" % message)
if time.time() - self.last_cleanup > self.timeout:
self._cleanup()
except socket.timeout:
self._cleanup()
except (KeyboardInterrupt, SystemExit):
exit()
except ValueError as e:
if self.debug:
print(e)
pass # ignore
def make_packet(self, msg_type, seqno, msg):
# msg_type can be either 'start', 'end', 'data', or 'ack'
# seqno is simply the sequence number of the packet
# msg is simply the packet's data
body = "%s|%d|%s|" % (msg_type, seqno, msg)
checksum = Checksum.generate_checksum(body)
packet = "%s%s" % (body, checksum)
return packet
def make_packet(self,msg_type,seqno,msg):
# msg_type can be either 'start', 'end', 'data', or 'ack'
# seqno is simply the sequence number of the packet
# msg is simply the packet's data
body = "%s|%d|%s|" % (msg_type,seqno,msg)
checksum = Checksum.generate_checksum(body)
packet = "%s%s" % (body,checksum)
return packet
def handle_response(self, response_packet):
if Checksum.validate_checksum(response_packet):
# print "Checksum is valid: %s" % response_packet
print "Checksum is valid!"
else:
# Checksum for response packet is not valid
# Naively, we simply just resend the packet
self.send(self.packet_to_send)
def make_packet(self, msg_type=None, seqno=None, msg=None, packet=None):
if msg_type is not None:
body = b"".join([
msg_type.encode(), b'|',
bytes(str(seqno).encode()), b'|', msg, b'|'
])
checksum = Checksum.generate_checksum(body)
return_packet = body + checksum
return return_packet
else:
body = b"".join([
packet[0].encode(), b'|',
bytes(str(packet[1]).encode()), b'|', packet[2], b'|'
])
checksum = Checksum.generate_checksum(body)
return_packet = body + checksum
return return_packet
def handle_response(self,response_packet):
if Checksum.validate_checksum(response_packet):
# print "Checksum is valid: %s" % response_packet
print "Checksum is valid!"
else:
# Checksum for response packet is not valid
# Naively, we simply just resend the packet
self.send(self.packet_to_send)
def start(self):
# print "AnDJ-Sender: dport = ",
# print self.dport
# send 5 packets and store these 5 packets to window.
frequent = 0
while frequent != 5:
msg = self.infile.read(4000)
# print 'AnDJ-Sender: ----------read the file'
msg_type = 'data'
if msg == "":
msg_type = 'end'
packet = self.make_packet(msg_type, frequent, msg)
self.window.append(packet)
# print 'AnDJ-Sender: will send packet: %s|%d' % (msg_type, frequent)
self.send(packet)
self.isreadall = True
break
else:
if frequent == 0:
msg_type = 'start'
packet = self.make_packet(msg_type, frequent, msg)
self.window.append(packet)
# print 'AnDJ-Sender: will send packet: %s|%d' % (msg_type, frequent)
self.send(packet)
frequent = frequent + 1
time.sleep(2)
while len(self.window) != 0:
try:
response = self.receive(0.5)
# print 'AnDJ-Sender: receive successful: message = ',
# print response
# self.handle_response(response)
if not Checksum.validate_checksum(response):
print "AnDJ-Sender: %s" % 'checksum error'
continue
expectno, checksum = self.split_ack_packet(response)[1:]
if checksum:
# print 'AnDJ-Sender: start to handle the ack. new_ack or dup_ack'
msg_type, seqno, data, checksum = self.split_packet(self.window[0])
if int(expectno) - int(seqno) > 0:
# print '1'
self.skip_window(int(expectno) - int(seqno))
else:
# print '2'
self.handle_dup_ack(expectno)
# print '--------------------------------------------------------'
except socket.timeout:
self.handle_timeout()
self.infile.close()
def handle_response(self, response):
if (response == None):
buffer = deque()
while (len(self.queue) != 0):
packet = self.queue.popleft()
self.send(packet)
buffer.append(packet)
while (len(buffer) != 0):
packet = buffer.popleft()
self.queue.append(packet)
response = self.receive(0.50)
self.handle_response(response)
elif Checksum.validate_checksum(response) == False:
return
elif Checksum.validate_checksum(response):
type1, seq, seqno_list, checksum = self.split_packet(response)
packet = self.queue.pop()
self.queue.append(packet)
type2, seq2, data, checksum = self.split_packet(response)
if int(seq) - 1 < self.unacknowledge:
if int(seq) < self.unacknowledge:
return
l = seqno_list.split(' ')
send_list = list()
for x in range(self.unacknowledge, int(seq2) + 1):
if x not in l:
send_list.append(x - self.unacknowledge)
buffer = deque()
for i in range(int(seq2) + 1 - self.unacknowledge):
packet = self.queue.popleft()
if i in send_list:
self.send(packet)
buffer.append(packet)
while (len(buffer) != 0):
packet = buffer.pop()
self.queue.appendleft(packet)
response = self.receive(0.50)
self.handle_response(response)
else:
self.difference = int(seq) - self.unacknowledge
d = self.difference
while (d > 0):
self.unacknowledge += 1
self.queue.popleft()
d -= 1
def handle_response(self,response):
if (response==None):
buffer=deque()
while (len(self.queue)!=0):
packet =self.queue.popleft()
self.send(packet)
buffer.append(packet)
while (len(buffer) !=0):
packet=buffer.popleft()
self.queue.append(packet)
response = self.receive(0.50)
self.handle_response(response)
elif Checksum.validate_checksum(response)==False:
return
elif Checksum.validate_checksum(response):
type1, seq ,seqno_list,checksum =self.split_packet(response)
packet=self.queue.pop()
self.queue.append(packet)
type2, seq2, data ,checksum=self.split_packet(response)
if int(seq)-1 < self.unacknowledge:
if int(seq) < self.unacknowledge:
return
l=seqno_list.split(' ')
send_list=list()
for x in range(self.unacknowledge,int(seq2)+1):
if x not in l:
send_list.append(x-self.unacknowledge)
buffer=deque()
for i in range(int(seq2)+1-self.unacknowledge):
packet=self.queue.popleft()
if i in send_list:
self.send(packet)
buffer.append(packet)
while(len(buffer) != 0):
packet=buffer.pop()
self.queue.appendleft(packet)
response=self.receive(0.50)
self.handle_response(response)
else:
self.difference = int(seq)- self.unacknowledge
d=self.difference
while (d >0):
self.unacknowledge +=1
self.queue.popleft()
d -=1
def handle_response(self,response):
#if None then its a timeout
msgtype, ack, data, checksum = self.split_packet(response)
if (response==None):
self.handle_timeout()
# make sure checksum works
elif Checksum.validate_checksum(response)==False:
print "recv: %s <--- CHECKSUM FAILED" % response
# if checksum works
elif Checksum.validate_checksum(response):
#if acktracker equal to ack that means repeat ack
if self.acktracker == ack:
self.handle_dup_ack(ack)
#if acktracker is less than ack that means new ack
if self.acktracker < ack:
print self.acktracker
self.handle_new_ack(ack)
print self.acktracker
def handle_response(self, response):
#if None then its a timeout
msgtype, ack, data, checksum = self.split_packet(response)
if (response == None):
self.handle_timeout()
# make sure checksum works
elif Checksum.validate_checksum(response) == False:
print "recv: %s <--- CHECKSUM FAILED" % response
# if checksum works
elif Checksum.validate_checksum(response):
#if acktracker equal to ack that means repeat ack
if self.acktracker == ack:
self.handle_dup_ack(ack)
#if acktracker is less than ack that means new ack
if self.acktracker < ack:
print self.acktracker
self.handle_new_ack(ack)
print self.acktracker
def handle_response(self,response_packet):
if Checksum.validate_checksum(response_packet):
if DEBUG:
print "recv: %s " % response_packet
return 1
else:
if DEBUG:
print "recv: %s <--- CHECKSUM FAILED" % response_packet
return False
def send_message(self, data, priority='11', count_incr=True):
cksm = Checksum.calculate(data)
message = priority + json.dumps(data) + cksm
try:
self.sock.sendto(message, (self.rxip, self.rxport))
#TODO implement catch, fail, etc
except Exception:
pass
if count_incr:
self.counter.increment()
def check_ack_packet(self, packet):
msg_type, seqno, data, checksum = self.split_packet(packet)
if(msg_type != 'ack' and not self.sackMode):
return False
elif(msg_type!='sack' and self.sackMode):
return False
elif(Checksum.validate_checksum(checksum)):
return False
else:
return True
def handle_response(self, response_packet):
if Checksum.validate_checksum(response_packet):
internalACKPacket = self.internalACKPacketGenerator(response_packet)
if internalACKPacket.getMsgtype() == ACK_TYPE and self.window.validateAckPacket(internalACKPacket):
self.handle_cum_ack(internalACKPacket)
elif internalACKPacket.getMsgtype() == SACK_TYPE and self.window.validateAckPacket(internalACKPacket):
self.handle_sack_ack(internalACKPacket)
else:
# print('checksum drop or Window does not contain seqno')
pass
def handle_packet(self):
for p in self.forwarder.in_queue:
p_type = p.msg_type
p_no = p.seqno
if random.choice([True, False]):
p.update_packet(msg_type=p_type, seqno=-1, data='corrupt', full_packet=None, update_checksum=False)
valid = Checksum.validate_checksum(p)
self.forwarder.out_queue.append(p)
else:
self.forwarder.out_queue.append(p)
#empty out in_queue
self.forwarder.in_queue = []
def send_receive_loop(self):
while True:
self.send_five(self.ack_no)
response = self.receive(.5)
if response is not None and Checksum.validate_checksum(response):
# ack_no is always the last received ack
if self.ack_no <= self.ack_number(response):
self.ack_no = self.ack_number(response)
# if self.window == self.last_packet_no:
if ack_no >= len(message):
break
def handle_response(self,response):
if (response==None):
buffer=deque()
i=len(self.queue)+self.detect_network()
if (i<=0):
i=1
j=min(len(self.queue), i)
while (j > 0):
packet =self.queue.popleft()
self.send(packet)
self.resend_packets+=1
self.total_packets+=1
buffer.append(packet)
j-=1
while (len(buffer) !=0):
packet=buffer.pop()
self.queue.appendleft(packet)
response = self.receive(0.50)
self.handle_response(response)
elif Checksum.validate_checksum(response)==False:
return
elif Checksum.validate_checksum(response):
type1, seq ,data,checksum =self.split_packet(response)
if int(seq)-1 < self.unacknowledge:
if int(seq) < self.unacknowledge:
return
packet=self.queue.popleft()
self.send(packet)
self.resend_packets+=1
self.total_packets+=1
self.queue.appendleft(packet)
response=self.receive(0.50)
self.handle_response(response)
else:
self.difference = int(seq)- self.unacknowledge
d=self.difference
while (d >0):
self.unacknowledge +=1
self.queue.popleft()
d -=1