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