a2/code/client/main.py

   1 from sender import Sender
   2 import sys
   3
   4 # before running this program, be sure to run the TCPServer
   5 # also make sure to run the below command to prevent the OS from canceling our connection
   6 # sudo iptables -A OUTPUT -p tcp --tcp-flags PSH PSH -j ACCEPT
   7 # sudo iptables -A OUTPUT -p tcp --tcp-flags RST RST -j DROP
   8
   9 # for running tests, you may need to store information on the received sequence number for the server
  10 # you can do that by defining new fields within the sender class/global variables to store such info
  11
  12 # for non local communication, you can comment the raw sockets setting in sender.py (line 132)
  13
  14 # run using sudo (!!!) from a command line terminal
  15 # and don't mind/ignore eclipse's red markings.
  16
  17 if __name__ == "__main__":
  18     serverPort = 10000
  19     if len(sys.argv) > 1:
  20         serverPort = int(sys.argv[1])
  21     sender = Sender(serverIP="127.0.0.1", networkInterface="lo", isLocal=True, serverPort=serverPort, waitTime=1, isVerbose=1)
  22     # isLocal is True if the interface is a local one
  23     response = sender.sendInput("S", 100, 100)
  24
  25     # triggers the response SA _ 101 if the server is listening on the specified port
  26     # if the server isn't listening, there are no responses
  27     print sender.lastAckReceived
  28     print sender.isTimeout
  29
  30     # an example for the echo handling server
  31     if sender.isTimeout == False: # in case something was received
  32         sender.sendInput("A", 101, sender.lastSeqReceived + 1) # connection is established
  33         sender.sendInput("A", 101, sender.lastSeqReceived + 1, data = "C") # send some data
  34         sender.sendInput("A", 102, sender.lastSeqReceived + 1, data = "C") # send some data
  35         sender.sendInput("FA", 103, sender.lastSeqReceived + 1) # close connection (the echo also closes)
  36         sender.sendInput("RP", 104, 0) # reset connection
  37
  38     sender.sendReset() # switch sender port