Computer Networking : A Top-Down Approach 的課後作業.

要求: 基於UDP協議,實現一個Pinger工具. 服務端代碼已經提供了,自己實現客戶端的代碼.
完整的題目鏈接: https://wenku.baidu.com/view/ed19e6cce2bd960591c677d2.html

服務端代碼:

# UDPPingerServer.py
# We will need the following module to generate randomized lost packets
import random
from socket import *
# Create a UDP socket
# Notice the use of SOCK_DGRAM for UDP packets
serverSocket = socket(AF_INET, SOCK_DGRAM)
# Assign IP address and port number to socket
serverSocket.bind((‘127.0.0.1‘, 9600))
while True:
    # Generate random number in the range of 0 to 10
    print(‘Waiting for Client!‘)
    rand = random.randint(0, 10)
    # Receive the client packet along with the address it is coming from
    message, address = serverSocket.recvfrom(1024)
    print(message)
    # Capitalize the message from the client
    data = message.upper()# If rand is less is than 4, we consider the packet lost and do not respond
    if rand < 4:
        continue
    # Otherwise, the server responds
    serverSocket.sendto(data, address)
 

客戶端代碼

自己隨手寫的,還可以再完善下,也懶得改了,不過題目的基本要求已經達到了.

import time
from socket import *


server_address = (‘127.0.0.1‘, 9600)
count = 0

message = b‘python‘
while count < 10:
    clientSocket = socket(AF_INET, SOCK_DGRAM)
    clientSocket.settimeout(1)
    clientSocket.sendto(message, server_address)
    start_time = time.clock()
    try:
        data, address = clientSocket.recvfrom(1024)
        if data:
            end_time = time.clock()
            print(‘Ping:‘, (end_time - start_time)*1000)
            print(data)
            count += 1
    except:
        continue
 

Assignment 2: UDP Pinger[課後作業]