Assignment 2: UDP Pinger[课后作业]

Computer Networking : A Top-Down Approach 的课后作业.

要求: 基于UDP协议,实现一个Pinger工具. 服务端代码已经提供了,自己实现客户端的代码.

完整的题目链接: https://wenku.baidu.com/view/ed19e6cce2bd960591c677d2.html

服务端代码:

# 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)

客户端代码

自己随手写的,还可以再完善下,也懒得改了,不过题目的基本要求已经达到了.

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

巴特西

Assignment 2: UDP Pinger[课后作业]

服务端代码:

客户端代码

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