packetData = '' # Acknowledgment packets contain no data
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 1 # Syn bit has to be one since this is connection setup
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceID, destinationID,
acknowledgementNumber,
sequenceNumber, packetData,
urgentPointer, synBit, finBit,
rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log it
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + "Connection setup with Chan started. This is the first step of the threeway handshake.\n\n"
helper.WriteToLogFile(pathToAnnChanLogFile, 'a', data)
# Run till connection teardown or termination
while not exitEvent.isSet():
pass
# Wait for nnn's server to finish
annServer.join()
def handle(self):
# self.request is the TCP socket connected to the client
incomingPacket = self.request.recv(4096)
incomingPacketDecoded = pickle.loads(incomingPacket)
receivedFrom = helper.GetKeyFromValue(
incomingPacketDecoded.get('Source ID'))
global Mission3Counter
if incomingPacketDecoded.get('Fin Bit') == 1 and Mission3Counter == 7:
sourceID = portListeningTo # The port listening to
destinationID = helper.namesAndPorts.get(
'Jan'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = incomingPacketDecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
# Next byte of data that you want
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number'
) + 1 # Client wanted to disconnect, therefore no data in the original packet, ack # will be one more than client seq #
packetData = '' # Second step of three way handshake, therefore no data
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 0 # Syn bit is zero
finBit = 1 # Trying to finish connection
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceID, destinationID,
acknowledgementNumber,
sequenceNumber, packetData,
urgentPointer, synBit,
finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Mission Complete, Communication with Jan is Finished. This is the second step of the connection teardown.\n\n'
helper.WriteToLogFile(pathToAnnJanLogFile, 'a', data)
print('Fin Bit reveived.... sending Fin Bit to Jan....\n')
print('Ann Ending Connection...')
# exit Ann's event
exitEvent.set()
elif incomingPacketDecoded.get(
'Urgent Pointer') == 1 and Mission3Counter == 5:
Mission3Counter = 7
sourceID = portListeningTo # The port listening to
destinationID = helper.namesAndPorts.get(
'Jan'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = incomingPacketDecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
# Next byte of data that you want
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number') + len(incomingPacketDecoded.get('Data'))
packetData = 'Meeting Location: 32.76 N, -97.07 W\n' # Send the coordinates to meet Jan
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 0 # Syn bit is zero
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceID, destinationID,
acknowledgementNumber,
sequenceNumber, packetData,
urgentPointer, synBit,
finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Received following line.\n'
data = data + incomingPacketDecoded.get('Data')
data = data + 'Acknowledgement sent along with below line.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(pathToAnnJanLogFile, 'a', data)
print('Urg pointer resived: ' + incomingPacketDecoded.get('Data'))
print('\nAnnToJan: Meeting Location: 32.76 N, -97.07 W\n')
elif incomingPacketDecoded.get(
'Urgent Pointer') == 1 and Mission3Counter == 1:
# increment the next position
Mission3Counter = 5
sourceID = portListeningTo # The port listening to
destinationID = helper.namesAndPorts.get(
'Jan'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = incomingPacketDecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
# Next byte of data that you want
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number') + len(incomingPacketDecoded.get('Data'))
# authorize to execute and give code
packetData = 'PEPPER THE PEPPER\n'
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 0 # Syn bit is zero
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceID, destinationID,
acknowledgementNumber,
sequenceNumber, packetData,
urgentPointer, synBit,
finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Received following line.\n'
data = data + incomingPacketDecoded.get('Data')
data = data + 'Acknowledgement sent along with below line.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(pathToAnnJanLogFile, 'a', data)
print('Urg pointer resived: ' + incomingPacketDecoded.get('Data'))
print('\nAnnToJan: Execute\n' +
'The authorization code for the Airforce Headquarters:\n' +
'PEPPER THE PEPPER\n')
# When someone else is trying to setup connection with us
elif Mission3Counter < 0:
if incomingPacketDecoded.get(
'Syn Bit') == 1 and incomingPacketDecoded.get(
'Acknowledgement Number') == -1:
# Send TCP packet with syn bit still one and acknowledgement number as 1 + sequence number. Also, create your own sequence number
sourceID = portListeningTo # The port listening to
destinationID = incomingPacketDecoded.get(
'Source ID'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = random.randint(
10000, 99999
) # First time talking to client, create new sequence number
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number'
) + 1 # Client wanted to connect, therefore no data in the original packet, ack # will be one more than client seq #
packetData = '' # Second step of three way handshake, therefore no data
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 1 # Syn bit has to be one for the second step of threeway handshake
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Create packet with above data
responsePacket = helper.CreateTCPPacket(
sourceID, destinationID, acknowledgementNumber,
sequenceNumber, packetData, urgentPointer, synBit, finBit,
rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
if receivedFrom == 'Jan':
data = data + 'Jan as a client attempted to connect. Sent packet with Syn Bit as 1, which is the second step of the threeway handshake.\n\n'
helper.WriteToLogFile(pathToAnnJanLogFile, 'a', data)
elif receivedFrom == 'Chan':
data = data + 'Chan as a client attempted to connect. Sent packet with Syn Bit as 1, which is the second step of the threeway handshake.\n\n'
helper.WriteToLogFile(pathToAnnChanLogFile, 'a', data)
# Your attempt to setup connection with someone else has been responded to
elif incomingPacketDecoded.get('Syn Bit') == 1:
# Start sending data here and raise the flag to wait for acknowledgement
sourceID = portListeningTo # The port listening to
destinationID = incomingPacketDecoded.get(
'Source ID'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = incomingPacketDecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number'
) + 1 # Just one more than the sequence number
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 0 # Threeway handshake third step, no need of this bit
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Populate data field depending on who the connection is being established with
if receivedFrom == 'Jan':
try:
packetData = contentAnnToJan.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
print('Ann-_Jan.txt is empty.\n\n')
elif receivedFrom == 'Chan':
try:
packetData = contentAnnToChan.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
print('Ann-_Chan.txt is empty.\n\n')
# Create packet with above data
responsePacket = helper.CreateTCPPacket(
sourceID, destinationID, acknowledgementNumber,
sequenceNumber, packetData, urgentPointer, synBit, finBit,
rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
if receivedFrom == 'Jan':
data = data + 'Connection with Jan as the server is successful. This is the third step of the threeway handshake. First line, which is below was sent.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(pathToAnnJanLogFile, 'a', data)
elif receivedFrom == 'Chan':
data = data + 'Connection with Chan as the server is successful. This is the third step of the threeway handshake. First line, which is below was sent.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(pathToAnnChanLogFile, 'a', data)
# Any other case, is receiving data
else:
global Chan_Counter
# terminate communication with Chan and inform Jan about compromise
if Chan_Counter == 5:
Chan_Counter = Chan_Counter + 1
Mission3Counter = 1
print(
"Terminating Connection With Agent Chan since Chan is compromised.\n"
)
# send jan a packet with urgbit 1 with Chan being compromised
sourceID = portListeningTo # The port listening to
destinationID = helper.namesAndPorts.get(
'Jan'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = random.randint(
10000, 99999
) # First time talking to client, create new that the other party is expecting
# Next byte of data that you want
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number') + 1
packetData = 'Communication with Chan has been Compromised' # Termination packet contain no data
urgentPointer = 1 # Urgent pointer is 1 to tell Jan that Chan has been compromised
synBit = 0 # Syn bit has to be one for the second step of
finBit = 0 #
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0
responsePacket = helper.CreateTCPPacket(
sourceID, destinationID, acknowledgementNumber,
sequenceNumber, packetData, urgentPointer, synBit,
finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket,
portTalkingTo)
# log in the termination
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Communication with Chan has been Terminated.\n\n'
helper.WriteToLogFile(pathToAnnJanLogFile, 'a', data)
print(
'AnnToJan: Urg Pointer On: Communication with Chan has been compromised.'
)
# send chan a packet with terbit 1
sourceID = portListeningTo # The port listening to
destinationID = helper.namesAndPorts.get(
'Chan'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = incomingPacketDecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
# Next byte of data that you want
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number') + len(
incomingPacketDecoded.get('Data'))
packetData = '' # Termination packet contain no data
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 0 # Syn bit has to be one for the second step of
finBit = 0 #
rstBit = 1 # reset communication flag on to terminate communication
terBit = 1 # make terbit 1 to start termination with chan
responsePacket = helper.CreateTCPPacket(
sourceID, destinationID, acknowledgementNumber,
sequenceNumber, packetData, urgentPointer, synBit,
finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket,
portTalkingTo)
# log in the termination
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Communication with Chan has been Terminated.\n\n'
helper.WriteToLogFile(pathToAnnChanLogFile, 'a', data)
else:
# Send acknowledgement
sourceID = portListeningTo # The port listening to
destinationID = incomingPacketDecoded.get(
'Source ID'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = incomingPacketDecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
# Next byte of data that you want
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number') + len(
incomingPacketDecoded.get('Data'))
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 0 # Syn bit has to be one for the second step of threeway handshake
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Populate data field depending on who the connection is being established with
if receivedFrom == 'Jan':
try:
packetData = contentAnnToJan.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
# send jan a packet with urgbit 1 with Chan being compromised
sourceID = portListeningTo # The port listening to
destinationID = helper.namesAndPorts.get(
'Jan'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = random.randint(
10000, 99999
) # First time talking to client, create new that the other party is expecting
# Next byte of data that you want
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number') + 1
packetData = 'Communication with Chan has been Compromised' # Termination packet contain no data
urgentPointer = 1 # Urgent pointer is 1 to tell Jan that Chan has been compromised
synBit = 0 # Syn bit has to be one for the second step of
finBit = 0 #
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0
responsePacket = helper.CreateTCPPacket(
sourceID, destinationID, acknowledgementNumber,
sequenceNumber, packetData, urgentPointer,
synBit, finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(
responsePacket, portTalkingTo)
# log in the termination
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(
timeStamp).strftime('%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Communication with Chan has been Terminated.\n\n'
helper.WriteToLogFile(pathToAnnJanLogFile, 'a',
data)
elif receivedFrom == 'Chan':
try:
packetData = contentAnnToChan.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
# Kick of connection tear down function here
pass
# Create packet with above data
responsePacket = helper.CreateTCPPacket(
sourceID, destinationID, acknowledgementNumber,
sequenceNumber, packetData, urgentPointer, synBit,
finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket,
portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Received following line.\n'
data = data + incomingPacketDecoded.get('Data')
data = data + 'Acknowledgement sent along with below line.\n'
data = data + packetData + '\n\n'
if receivedFrom == 'Jan':
helper.WriteToLogFile(pathToAnnJanLogFile, 'a', data)
elif receivedFrom == 'Chan':
helper.WriteToLogFile(pathToAnnChanLogFile, 'a', data)
Chan_Counter = Chan_Counter + 1
return
def handle(self):
incoming_pckt = self.request.recv(4096)
decoded_pckt = pickle.loads(incoming_pckt)
receiver = helper.GetKeyFromValue(decoded_pckt.get('Source ID'))
if decoded_pckt.get('Ter Bit') == 1:
print('Connection terminated by Ann.\n')
threading.Event().set()
elif decoded_pckt.get('Syn Bit') == 1 and decoded_pckt.get(
'Acknowledgement Number') == -1:
source_id = listeningport # The port listening to
destination_id = decoded_pckt.get('Source ID')
sequence_num = random.randint(10000, 99999)
ack_num = decoded_pckt.get('Sequence Number') + 1
packet_data = ''
urg_pointer = 0
syn_bit = 1
fin_bit = 0
rst_bit = 0
ter_bit = 0
# Create packet with above data
resp_pckt = helper.CreateTCPPacket(source_id, destination_id,
ack_num, sequence_num,
packet_data, urg_pointer,
syn_bit, fin_bit, rst_bit,
ter_bit)
# Send packet
helper.SerializeAndSendPacket(resp_pckt, talkingport)
# Maintain log
current_time = time.time()
shared_data = datetime.datetime.fromtimestamp(
current_time).strftime('%Y-%m-%d %H:%M:%S') + '\n'
if receiver == 'Ann':
shared_data = shared_data + 'Connection request from Ann.\n\n'
helper.WriteToLogFile(chanannlog_file, 'a', shared_data)
elif receiver == 'Jan':
shared_data = shared_data + 'Connection requested from Jan.\n\n'
helper.WriteToLogFile(chanjanlog_file, 'a', shared_data)
elif decoded_pckt.get('Syn Bit') == 1:
# Send data and raise the flag to wait for acknowledgement
source_id = listeningport
destination_id = decoded_pckt.get('Source ID')
sequence_num = decoded_pckt.get('Acknowledgement Number')
ack_num = decoded_pckt.get('Sequence Number') + 1
urg_pointer = 0
syn_bit = 0
fin_bit = 0
rst_bit = 0
ter_bit = 0
# Populate data field depending on who the connection is being established with
if receiver == 'Ann':
try:
packet_data = chantoann_comm.pop(
0) # Traverse the text file line by line
except IndexError:
print('Chan-Ann.txt is empty.\n\n')
elif receiver == 'Jan':
try:
packet_data = chantojan_comm.pop(0)
except IndexError:
print('Chan-Jan.txt is empty.\n\n')
# Create packet with above data
resp_pckt = helper.CreateTCPPacket(source_id, destination_id,
ack_num, sequence_num,
packet_data, urg_pointer,
syn_bit, fin_bit, rst_bit,
ter_bit)
# Send packet
helper.SerializeAndSendPacket(resp_pckt, talkingport)
# Log what happened
current_time = time.time()
shared_data = datetime.datetime.fromtimestamp(
current_time).strftime('%Y-%m-%d %H:%M:%S') + '\n'
if receiver == 'Ann':
shared_data = shared_data + 'Connection established with Ann.\n'
shared_data = shared_data + packet_data + '\n\n'
helper.WriteToLogFile(chanannlog_file, 'a', shared_data)
elif receiver == 'Jan':
shared_data = shared_data + 'Connection established with Jan.\n'
shared_data = shared_data + packet_data + '\n\n'
helper.WriteToLogFile(chanjanlog_file, 'a', shared_data)
# Receiving data
else:
source_id = listeningport
destination_id = decoded_pckt.get('Source ID')
sequence_num = decoded_pckt.get('Acknowledgement Number')
ack_num = decoded_pckt.get('Sequence Number') + len(
decoded_pckt.get('Data'))
urg_pointer = 0
syn_bit = 0
fin_bit = 0
rst_bit = 0
ter_bit = 0
if receiver == 'Ann':
try:
packet_data = chantoann_comm.pop(0)
except IndexError:
pass
elif receiver == 'Jan':
try:
packet_data = chantojan_comm.pop(0)
except IndexError:
pass
# Create packet with above data
resp_pckt = helper.CreateTCPPacket(source_id, destination_id,
ack_num, sequence_num,
packet_data, urg_pointer,
syn_bit, fin_bit, rst_bit,
ter_bit)
# Send packet
helper.SerializeAndSendPacket(resp_pckt, talkingport)
current_time = time.time()
shared_data = datetime.datetime.fromtimestamp(
current_time).strftime('%Y-%m-%d %H:%M:%S') + '\n'
shared_data = shared_data + 'Received following line.\n'
shared_data = shared_data + decoded_pckt.get('Data')
shared_data = shared_data + 'Acknowledgement sent along with below line.\n'
shared_data = shared_data + packet_data + '\n\n'
if receiver == 'Ann':
helper.WriteToLogFile(chanannlog_file, 'a', shared_data)
elif receiver == 'Jan':
helper.WriteToLogFile(chanjanlog_file, 'a', shared_data)
return
def handle(self):
# self.request is the TCP socket connected to the client
packetOnTheWay = self.request.recv(4096)
packet = pickle.loads(packetOnTheWay)
print(routerName + '\n' + str(packet) + '\n')
sourceID = packet.get('Source ID')
destinationID = packet.get('Destination ID')
# Packet is from Ann to Jan
if sourceID == helper.namesAndPorts.get('Ann') and destinationID == helper.namesAndPorts.get('Jan'):
helper.PassPacket(pathAnnToJan, routerName, packetOnTheWay)
# Packet is from Jan to the Airforce
elif sourceID == helper.namesAndPorts.get('Jan') and destinationID == helper.namesAndPorts.get('H'):
sourceID = helper.namesAndPorts.get('H')
destinationID = helper.namesAndPorts.get('Jan') # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = random.randint(10000, 99999) # First time talking to Jan, create new sequence number
# Next byte of data that you want
acknowledgementNumber = packet.get('Sequence Number')+ len(packet.get('Data'))
packetData = 'Success!' # Second step of three way handshake, therefore no data
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 0 # Syn bit is zero
finBit = 0 # Trying to finish connection
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceID, destinationID, acknowledgementNumber, sequenceNumber, packetData, urgentPointer, synBit, finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, destinationID)
# Log what happened at the airport router
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime('%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Received following line.\n'
data = data + packet.get('Data')
data = data + 'Acknowledgement sent along with below line.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(pathToAirForceJanLogFile, 'w', data)
print('Airforce to Jan: Success!')
# Packet is from Jan to Ann
elif sourceID == helper.namesAndPorts.get('Jan') and destinationID == helper.namesAndPorts.get('Ann'):
helper.PassPacket(pathJanToAnn, routerName, packetOnTheWay)
# Packet is from Jan to Chan
elif sourceID == helper.namesAndPorts.get('Jan') and destinationID == helper.namesAndPorts.get('Chan'):
helper.PassPacket(pathJanToChan, routerName, packetOnTheWay)
# Packet is from Chan to Jan
elif sourceID == helper.namesAndPorts.get('Chan') and destinationID == helper.namesAndPorts.get('Jan'):
helper.PassPacket(pathChanToJan, routerName, packetOnTheWay)
# Packet is from Ann to Chan
elif sourceID == helper.namesAndPorts.get('Ann') and destinationID == helper.namesAndPorts.get('Chan'):
helper.PassPacket(pathAnnToChan, routerName, packetOnTheWay)
# Packet is from Jan to Ann
elif sourceID == helper.namesAndPorts.get('Chan') and destinationID == helper.namesAndPorts.get('Ann'):
helper.PassPacket(pathChanToAnn, routerName, packetOnTheWay)
# Packet has no right direction
else:
print('Packet has no right direction' + '\n\n')
return
sequence_num = random.randint(1000, 9999)
ack_num = -1
packet_data = ''
urg_pointer = 0
syn_bit = 1
fin_bit = 0
rst_bit = 0
ter_bit = 0
# Create packet with above data
resp_pckt = helper.CreateTCPPacket(source_id, destination_id, ack_num,
sequence_num, packet_data,
urg_pointer, syn_bit, fin_bit,
rst_bit, ter_bit)
# Send packet
helper.SerializeAndSendPacket(resp_pckt, talkingport)
# Log it
current_time = time.time()
shared_data = datetime.datetime.fromtimestamp(current_time).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
shared_data = shared_data + "Establishing connection with server Jan initiated.\n\n"
helper.WriteToLogFile(chanjanlog_file, 'a', shared_data)
# Execute until connection termination
while not threading.Event().isSet():
pass
# Wait for Chan's server to finish
chanServer.join()
sys.exit()
except KeyboardInterrupt:
sequenceno = random.randint(10000, 99999) # First time talking to Jan, create new sequence number
acknumber = -1 # Haven't recevied anything from Jan, hence -1
packetData = '' # Acknowledgment packets contain no data
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 1 # Syn bit has to be one since this is connection setup
finBit = 0 # Not trying to finish connection, hence 0
rstBit = 0 # Not trying to reset connection, hence 0
terBit = 0 # Not trying to terminate connection, hence 0
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceid, destinationid, acknumber, sequenceno,
packetData, urgentPointer,
synBit, finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, talkingport)
# Log it
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime('%Y-%m-%d %H:%M:%S') + '\n'
data = data + "Connection setup with Chan started. This is the first step of the threeway handshake.\n\n"
helper.WriteToLogFile(annchan_logfile, 'a', data)
# Run till connection teardown or termination
while not threadingEvent.isSet():
pass
# Wait for ann's server to finish
annserver.join()
sys.exit()
def handle(self):
# self.request is the TCP socket connected to the client
incomingPacket = self.request.recv(4096)
incomingPacketDecoded = pickle.loads(incomingPacket)
receivedFrom = helper.GetKeyFromValue(
incomingPacketDecoded.get('Source ID'))
if incomingPacketDecoded.get('Ter Bit') == 1:
print('Ann has ordered the termination of the connection.\n')
exitEvent.set()
# When someone else is trying to setup connection with us
elif incomingPacketDecoded.get(
'Syn Bit') == 1 and incomingPacketDecoded.get(
'Acknowledgement Number') == -1:
# Send TCP packet with syn bit still one and acknowledgement number as 1 + sequence number. Also, create your own sequence number
sourceID = portListeningTo # The port listening to
destinationID = incomingPacketDecoded.get(
'Source ID'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = random.randint(
10000, 99999
) # First time talking to client, create new sequence number
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number'
) + 1 # Client wanted to connect, therefore no data in the original packet, ack # will be one more than client seq #
packetData = '' # Second step of three way handshake, therefore no data
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 1 # Syn bit has to be one for the second step of threeway handshake
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceID, destinationID,
acknowledgementNumber,
sequenceNumber, packetData,
urgentPointer, synBit,
finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
if receivedFrom == 'Jan':
data = data + 'Jan as a client attempted to connect. Sent packet with Syn Bit as 1, which is the second step of the threeway handshake.\n\n'
helper.WriteToLogFile(pathToChanJanLogFile, 'a', data)
elif receivedFrom == 'Ann':
data = data + 'Ann as a client attempted to connect. Sent packet with Syn Bit as 1, which is the second step of the threeway handshake.\n\n'
helper.WriteToLogFile(pathToChanAnnLogFile, 'a', data)
# Your attempt to setup connection with someone else has been responded to
elif incomingPacketDecoded.get('Syn Bit') == 1:
# Start sending data here and raise the flag to wait for acknowledgement
sourceID = portListeningTo # The port listening to
destinationID = incomingPacketDecoded.get(
'Source ID'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = incomingPacketDecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number'
) + 1 # Just one more than the sequence number
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 0 # Threeway handshake third step, no need of this bit
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Populate data field depending on who the connection is being established with
if receivedFrom == 'Jan':
try:
packetData = contentChanToJan.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
print('Chan-_Jan.txt is empty.\n\n')
elif receivedFrom == 'Ann':
try:
packetData = contentChanToAnn.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
print('Chan-_Ann.txt is empty.\n\n')
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceID, destinationID,
acknowledgementNumber,
sequenceNumber, packetData,
urgentPointer, synBit,
finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
if receivedFrom == 'Jan':
data = data + 'Connection with Jan as the server is successful. This is the third step of the threeway handshake. First, which is below line was sent.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(pathToChanJanLogFile, 'a', data)
elif receivedFrom == 'Ann':
data = data + 'Connection with Ann as the server is successful. This is the third step of the threeway handshake. First, which is below line was sent.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(pathToChanAnnLogFile, 'a', data)
# Any other case, is receiving data
else:
# Send acknowledgement
sourceID = portListeningTo # The port listening to
destinationID = incomingPacketDecoded.get(
'Source ID'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = incomingPacketDecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
# Next byte of data that you want
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number') + len(incomingPacketDecoded.get('Data'))
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 0 # Syn bit has to be one for the second step of threeway handshake
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Populate data field depending on who the connection is being established with
if receivedFrom == 'Jan':
try:
packetData = contentChanToJan.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
# Kick of connection tear down function here
pass
elif receivedFrom == 'Ann':
try:
packetData = contentChanToAnn.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
# Kick of connection tear down function here
pass
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceID, destinationID,
acknowledgementNumber,
sequenceNumber, packetData,
urgentPointer, synBit,
finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Received following line.\n'
data = data + incomingPacketDecoded.get('Data')
data = data + 'Acknowledgement sent along with below line.\n'
data = data + packetData + '\n\n'
if receivedFrom == 'Jan':
helper.WriteToLogFile(pathToChanJanLogFile, 'a', data)
elif receivedFrom == 'Ann':
helper.WriteToLogFile(pathToChanAnnLogFile, 'a', data)
return
def handle(self):
# self.request is the TCP socket connected to the client
incomingPacket = self.request.recv(4096)
incomingPacketDecoded = pickle.loads(incomingPacket)
receivedFrom = helper.GetKeyFromValue(
incomingPacketDecoded.get('Source ID'))
global Mission3Counter
if incomingPacketDecoded.get('Fin Bit') == 1 and Mission3Counter == 8:
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Acknowledgement recieved, Communication with Ann is Finished.This is the third step for the communication teardown.\n\n'
helper.WriteToLogFile(pathToJanAnnLogFile, 'a', data)
# exit Jan's event
print('Fin Bit reveived....\n')
print('Jan Ending Connection...')
exitEvent.set()
elif Mission3Counter == 6:
# increment the next position
Mission3Counter = 8
sourceID = portListeningTo # The port listening to
destinationID = helper.namesAndPorts.get(
'Ann'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = incomingPacketDecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
# Next byte of data that you want
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number') + len(incomingPacketDecoded.get('Data'))
packetData = 'Request for a finish mission?\n' # Second step of three way handshake, therefore no data
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 0 # Syn bit is zero
finBit = 1 # Trying to finish connection
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceID, destinationID,
acknowledgementNumber,
sequenceNumber, packetData,
urgentPointer, synBit,
finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Received following line.\n'
data = data + incomingPacketDecoded.get('Data')
data = data + 'Acknowledgement sent along with below line. This is the first step of the connection teardown.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(pathToJanAnnLogFile, 'a', data)
print('JanToAnn: sending Fin Bit to ann.\n')
elif Mission3Counter == 4 and incomingPacketDecoded.get(
'Data') == 'Success!':
# increment the next position
Mission3Counter = 6
sourceID = portListeningTo # The port listening to
destinationID = helper.namesAndPorts.get(
'Ann'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = incomingPacketDecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
# Next byte of data that you want
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number') + len(incomingPacketDecoded.get('Data'))
# confirm success by giving the code
packetData = 'The authorization code:\n' + 'Congratulations we have fried dry green leaves\n'
urgentPointer = 1 # Message is urgent
synBit = 0 # Syn bit is zero
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceID, destinationID,
acknowledgementNumber,
sequenceNumber, packetData,
urgentPointer, synBit,
finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Received following line.\n'
data = data + incomingPacketDecoded.get('Data')
data = data + 'Acknowledgement sent along with below line.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(pathToJanAnnLogFile, 'a', data)
print('Recieved Success packet from Head Quarters.\n')
print('JanToAnn: Urg Pointer On: The authorization code:\n' +
'Congratulations we have fried dry green leaves\n')
elif Mission3Counter == 2 and incomingPacketDecoded.get(
'Data') == 'PEPPER THE PEPPER\n':
# increment the next position
# need to see how to execute to router H
sourceID = portListeningTo # The port listening to
destinationID = helper.namesAndPorts.get(
'H'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = sequenceNumber = random.randint(
10000, 99999
) # The next byte you should be sending is the byte that the other party is expecting
# Next byte of data that you want
acknowledgementNumber = -1
# confirm success by giving the code
packetData = 'Location of target: (32° 43 22.77 N,97° 9 7.53 W)\n' + 'The authorization code for the Airforce Headquarters:\n' + 'PEPPER THE PEPPER\n'
urgentPointer = 1 # Message is urgent
synBit = 0 # Syn bit is zero
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceID, destinationID,
acknowledgementNumber,
sequenceNumber, packetData,
urgentPointer, synBit,
finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket,
helper.namesAndPorts.get('H'))
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Received following line.\n'
data = data + incomingPacketDecoded.get('Data')
data = data + 'Acknowledgement sent along with below line.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(pathToJanAirForceLogFile, 'a', data)
Mission3Counter = 4
print('Recieved Authorization code from Ann.\n')
print(
'JanToAirForce: Location of target: (32° 43 22.77 N,97° 9 7.53 W)\n'
+ 'The authorization code for the Airforce Headquarters:\n' +
'PEPPER THE PEPPER\n')
elif incomingPacketDecoded.get('Urgent Pointer') == 1:
# increment the next position
Mission3Counter = 2
sourceID = portListeningTo # The port listening to
destinationID = helper.namesAndPorts.get(
'Ann'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = incomingPacketDecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
# Next byte of data that you want
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number') + len(incomingPacketDecoded.get('Data'))
# confirm success by giving the code
packetData = 'Location of target: (32° 43 22.77 N,97° 9 7.53 W)\n' + 'Request for a mission execution?\n'
urgentPointer = 1 # Message is urgent
synBit = 0 # Syn bit is zero
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceID, destinationID,
acknowledgementNumber,
sequenceNumber, packetData,
urgentPointer, synBit,
finBit, rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Received following line.\n'
data = data + incomingPacketDecoded.get('Data')
data = data + 'Acknowledgement sent along with below line.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(pathToJanAnnLogFile, 'a', data)
print('Urg pointer resived: ' + incomingPacketDecoded.get('Data'))
print(
'JanToAnn: Urg Pointer On: Location of target: (32° 43 22.77 N,97° 9 7.53 W)\n'
+ 'Request for a mission execution?\n')
elif Mission3Counter < 0:
# When someone else is trying to setup connection with us
if incomingPacketDecoded.get(
'Syn Bit') == 1 and incomingPacketDecoded.get(
'Acknowledgement Number') == -1:
# Send TCP packet with syn bit still one and acknowledgement number as 1 + sequence number. Also, create your own sequence number
sourceID = portListeningTo # The port listening to
destinationID = incomingPacketDecoded.get(
'Source ID'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = random.randint(
10000, 99999
) # First time talking to client, create new sequence number
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number'
) + 1 # Client wanted to connect, therefore no data in the original packet, ack # will be one more than client seq #
packetData = '' # Second step of three way handshake, therefore no data
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 1 # Syn bit has to be one for the second step of threeway handshake
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Create packet with above data
responsePacket = helper.CreateTCPPacket(
sourceID, destinationID, acknowledgementNumber,
sequenceNumber, packetData, urgentPointer, synBit, finBit,
rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
if receivedFrom == 'Chan':
data = data + 'Chan as a client attempted to connect. Sent packet with Syn Bit as 1, which is the second step of the threeway handshake.\n\n'
helper.WriteToLogFile(pathToJanChanLogFile, 'a', data)
elif receivedFrom == 'Ann':
data = data + 'Ann as a client attempted to connect. Sent packet with Syn Bit as 1, which is the second step of the threeway handshake.\n\n'
helper.WriteToLogFile(pathToJanAnnLogFile, 'a', data)
# Your attempt to setup connection with someone else has been responded to
elif incomingPacketDecoded.get('Syn Bit') == 1:
# Start sending data here and raise the flag to wait for acknowledgement
sourceID = portListeningTo # The port listening to
destinationID = incomingPacketDecoded.get(
'Source ID'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = incomingPacketDecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number'
) + 1 # Just one more than the sequence number
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 0 # Threeway handshake third step, no need of this bit
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Populate data field depending on who the connection is being established with
if receivedFrom == 'Chan':
try:
packetData = contentJanToChan.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
print('Jan-_Chan.txt is empty.\n\n')
elif receivedFrom == 'Ann':
try:
packetData = contentJanToAnn.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
print('Jan-_Ann.txt is empty.\n\n')
# Create packet with above data
responsePacket = helper.CreateTCPPacket(
sourceID, destinationID, acknowledgementNumber,
sequenceNumber, packetData, urgentPointer, synBit, finBit,
rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
if receivedFrom == 'Chan':
data = data + 'Connection with Chan as the server is successful. This is the third step of the threeway handshake. First, which is below line was sent.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(pathToJanChanLogFile, 'a', data)
elif receivedFrom == 'Ann':
data = data + 'Connection with Ann as the server is successful. This is the third step of the threeway handshake. First, which is below line was sent.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(pathToJanAnnLogFile, 'a', data)
# Any other case, is receiving data
else:
# Send acknowledgement
sourceID = portListeningTo # The port listening to
destinationID = incomingPacketDecoded.get(
'Source ID'
) # The destination of the packet about to be sent is where the original packet came from
sequenceNumber = incomingPacketDecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
# Next byte of data that you want
acknowledgementNumber = incomingPacketDecoded.get(
'Sequence Number') + len(incomingPacketDecoded.get('Data'))
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 0 # Syn bit has to be one for the second step of threeway handshake
finBit = 0 # Not trying to finish connection, therefore 0
rstBit = 0 # Not trying to reset connection, therefore 0
terBit = 0 # Not trying to terminate connection, therefore 0
# Populate data field depending on who the connection is being established with
if receivedFrom == 'Chan':
try:
packetData = contentJanToChan.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
# Kick of connection tear down function here
pass
elif receivedFrom == 'Ann':
try:
packetData = contentJanToAnn.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
# Kick of connection tear down function here
pass
# Create packet with above data
responsePacket = helper.CreateTCPPacket(
sourceID, destinationID, acknowledgementNumber,
sequenceNumber, packetData, urgentPointer, synBit, finBit,
rstBit, terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, portTalkingTo)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Received following line.\n'
data = data + incomingPacketDecoded.get('Data')
data = data + 'Acknowledgement sent along with below line.\n'
data = data + packetData + '\n\n'
if receivedFrom == 'Chan':
helper.WriteToLogFile(pathToJanChanLogFile, 'a', data)
elif receivedFrom == 'Ann':
helper.WriteToLogFile(pathToJanAnnLogFile, 'a', data)
return
def handle(self):
# socket connecting to client here
packetgoingin = self.request.recv(4096)
packetgoingindecoded = pickle.loads(packetgoingin)
messagereceivedfrom = helper.GetKeyFromValue(
packetgoingindecoded.get('Source ID'))
if packetgoingindecoded.get('Ter Bit') == 1:
print('Ann has ordered the termination of the connection.\n')
exitEvent.set()
# To check if someone else is trying to corrupt the connection.
elif packetgoingindecoded.get(
'Syn Bit') == 1 and packetgoingindecoded.get(
'Acknowledgement Number') == -1:
# ack +1 and creating own sequence number.
#Three way handshake
sourceid = listeningport
destinationid = packetgoingindecoded.get('Source ID')
sequenceno = random.randint(
10000, 99999
) # First time talking to client, create new sequence number
acknumber = packetgoingindecoded.get(
'Sequence Number'
) + 1 # Client wanted to connect, hence no data in the original packet, ack # will be one more than client seq #
packetData = ''
urgentPointer = 0
synBit = 1 # Syn bit has to be one for the second step of threeway handshake
finBit = 0 # Not trying to finish connection, hence 0
rstBit = 0 # Not trying to reset connection, hence 0
terBit = 0 # Not trying to terminate connection, hence 0
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceid, destinationid,
acknumber, sequenceno,
packetData, urgentPointer,
synBit, finBit, rstBit,
terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, talkingport)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
if messagereceivedfrom == 'Jan':
data = data + 'Jan as a client attempted to connect. Sent packet with Syn Bit as 1, which is the second step of the threeway handshake.\n\n'
helper.WriteToLogFile(chanjan_logfile, 'a', data)
elif messagereceivedfrom == 'Ann':
data = data + 'Ann as a client attempted to connect. Sent packet with Syn Bit as 1, which is the second step of the threeway handshake.\n\n'
helper.WriteToLogFile(chanann_logfile, 'a', data)
# Connection setup response.
elif packetgoingindecoded.get('Syn Bit') == 1:
# Start sending data here and raise the flag to wait for acknowledgement
sourceid = listeningport # The port listening to
destinationid = packetgoingindecoded.get(
'Source ID'
) # The destination of the packet about to be sent is where the original packet came from
sequenceno = packetgoingindecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
acknumber = packetgoingindecoded.get(
'Sequence Number') + 1 # One more than the sequence number
urgentPointer = 0
synBit = 0 # Threeway handshake third step, no need of this bit
finBit = 0 # Not trying to finish connection, hence 0
rstBit = 0 # Not trying to reset connection, hence 0
terBit = 0 # Not trying to terminate connection, hence 0
# Populate data field depending on who the connection is being established with
if messagereceivedfrom == 'Jan':
try:
packetData = chantojan_comm.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
print('Chan-_Jan.txt is empty.\n\n')
elif messagereceivedfrom == 'Ann':
try:
packetData = chantoann_comm.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
print('Chan-_Ann.txt is empty.\n\n')
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceid, destinationid,
acknumber, sequenceno,
packetData, urgentPointer,
synBit, finBit, rstBit,
terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, talkingport)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
if messagereceivedfrom == 'Jan':
data = data + 'Connection with Jan as the server is successful. This is the third step of the threeway handshake. First, which is below line was sent.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(chanjan_logfile, 'a', data)
elif messagereceivedfrom == 'Ann':
data = data + 'Connection with Ann as the server is successful. This is the third step of the threeway handshake. First, which is below line was sent.\n'
data = data + packetData + '\n\n'
helper.WriteToLogFile(chanann_logfile, 'a', data)
# Any other case, is receiving data
else:
# Send acknowledgement
sourceid = listeningport # The port listening to
destinationid = packetgoingindecoded.get(
'Source ID'
) # The destination of the packet about to be sent is where the original packet came from
sequenceno = packetgoingindecoded.get(
'Acknowledgement Number'
) # The next byte you should be sending is the byte that the other party is expecting
# Next byte of data that you want
acknumber = packetgoingindecoded.get('Sequence Number') + len(
packetgoingindecoded.get('Data'))
urgentPointer = 0 # Not urgent as this is connection setup
synBit = 0 # Syn bit has to be one for the second step of threeway handshake
finBit = 0 # Not trying to finish connection, hence 0
rstBit = 0 # Not trying to reset connection, hence 0
terBit = 0 # Not trying to terminate connection, hence 0
# Populate data field depending on who the connection is being established with
if messagereceivedfrom == 'Jan':
try:
packetData = chantojan_comm.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
# Kick of connection tear down function here
pass
elif messagereceivedfrom == 'Ann':
try:
packetData = chantoann_comm.pop(
0
) # Get the first element from list and delete it from there
except IndexError:
# Kick of connection tear down function here
pass
# Create packet with above data
responsePacket = helper.CreateTCPPacket(sourceid, destinationid,
acknumber, sequenceno,
packetData, urgentPointer,
synBit, finBit, rstBit,
terBit)
# Send packet
helper.SerializeAndSendPacket(responsePacket, talkingport)
# Log what happened
timeStamp = time.time()
data = datetime.datetime.fromtimestamp(timeStamp).strftime(
'%Y-%m-%d %H:%M:%S') + '\n'
data = data + 'Received following line.\n'
data = data + packetgoingindecoded.get('Data')
data = data + 'Acknowledgement sent along with below line.\n'
data = data + packetData + '\n\n'
if messagereceivedfrom == 'Jan':
helper.WriteToLogFile(chanjan_logfile, 'a', data)
elif messagereceivedfrom == 'Ann':
helper.WriteToLogFile(chanann_logfile, 'a', data)
return
