def __init__(self, serverAddr):
self.remoteAddr = serverAddr
self.SequenceNumber = helpers.getISN()
self.lastack = None
try:
self.sockd = socket(AF_INET,SOCK_DGRAM)
except:
raise
self.sockd.connect(serverAddr)
self.address = self.sockd.getsockname()
self.sender = sender.Sender(self.sockd)
self.receiver = receiver.Receiver(self)
# send SYN to server
print("Initial sequence number: " + str(self.SequenceNumber))
h = packet.Header(self.address[1], self.remoteAddr[1], self.SequenceNumber, 0, synf=1, ackf=0)
self.sockd.send(h.pack())
self.SYNSent()
def SYNReceived(self): self.SequenceNumber = helpers.getISN() # send SYN/ACK h = packet.Header(self.port, self.clientPort, self.SequenceNumber, self.lastack, ackf=0,synf=1) self.sender.send(h.pack()) self.SequenceNumber = self.SequenceNumber + 1 self.established()
def SYNReceived(self):
self.SequenceNumber = helpers.getISN()
# send SYN/ACK
h = packet.Header(self.port,
self.clientPort,
self.SequenceNumber,
self.lastack,
ackf=0,
synf=1)
self.sender.send(h.pack())
self.SequenceNumber = self.SequenceNumber + 1
self.established()
