Client server comunication that passes through a UDP emulator
Args: p = probability to drop packet d = delay before sending packets q = max que length A = port A B = port B C = port C
Main thread: Port A will have a socket binded and wil andle all sending and recv Port A will recieve a packet and check the source if rand() returns a number less then p the packet is dropped if it is above p we continue if the packet is from B then it will be qued to C on condition if the packet is from C then it will be qued to B on condition Condition: if rand() is less then 100 - p and ListCount < q
Send thread: every d seconds it will check a Que if there is something to be sent it will send it if not it moves to the next Que loop
Args: port = port to binded on cport = client port
Main thread: Server will bind a socket and wait for inital packet After initial packet is recievd the sender thread is created for that client main thread will continue waiting for packets and check them if ACK it sets the flag to 0 if NACK1 it sets the flag to 1 if NACK2 it sets the flag to 2 flags are used to tell the send thread what to do
Send thread: in a loop depending on flag it will carry out an operation flag = 3: send the current window flag = 1: resend window index 1 flag = 2: resend window index 2 flag = 0: slide the window flag = 5: all frames have been sent, kill thread
Args: port = port to bind on servport = server port delay = used for flow control, how long to wait before resending NACK or ACK
socket will be binded to port and wait for packets timeout is set on socket client will keep sending inital packet until it starts recv frames while client is waiting for frames on each time out it will send a NACK based on what the position of its window is client will send ACK onces both frames have been recv and keep resending until next frame has been recv
Protocol client will send numbers as packets to indicate state 0 = ACK 1 = NACK for window index 1
