计算机网络自顶向下-套接字编程作业

作业1：Web服务器

# WebServer.py# import socket module
from concurrent.futures import thread
from socket import *
import sys # In order to terminate the program
import threadingdef webProcess(connectionSocket):try: message = connectionSocket.recv(1024).decode() print(message)filename = message.split()[1]                  f = open(filename[1:], encoding='utf-8')                         outputdata = f.read()             #Send one HTTP header line into socket header = "HTTP/1.1 200 OK\r\n\r\n"connectionSocket.send(header.encode())#Send the content of the requested file to the client for i in range(0, len(outputdata)):            connectionSocket.send(outputdata[i].encode()) connectionSocket.send("\r\n".encode()) connectionSocket.close() except IOError: #Send response message for file not found ErrorMessage = "HTTP/1.1 404 Not Found\r\n\r\n"connectionSocket.send(ErrorMessage.encode())#Close client socket connectionSocket.close()serverSocket = socket(AF_INET, SOCK_STREAM)
#Prepare a sever socket
serverPort = 6789
serverSocket.bind(('', serverPort))
serverSocket.listen(1)while True: #Establish the connection print('Ready to serve...') connectionSocket, addr = serverSocket.accept()          thread = threading.Thread(target=webProcess, args=(connectionSocket, ))thread.start()serverSocket.close()
sys.exit() #Terminate the program after sending the corresponding data

# WebClient.py#import socket module
from socket import *
import sys # In order to terminate the program clientSocket = socket(AF_INET, SOCK_STREAM)
ServerPort = 6789
ServerName = '127.0.0.1'
clientSocket.connect((ServerName, ServerPort))while True: Head = """GET /HelloWorld.html HTTP/1.1\r\nHost: %s:%s\r\nConnection: close\r\nUser-agent: Mozilla/5.0\r\nAccept-language: en""" % (ServerName, ServerPort)clientSocket.send(Head.encode('utf-8'))data = clientSocket.recv(1024)print(data)with open('response.html', 'ab+') as f:f.write(data)

作业2：UDP ping程序

# UDPPingerClient.py# UDPPingerServer.py
# We will need the following module to generate randomized lost packets
from email import message
import random
from socket import *
import timeserverName = '127.0.0.1'
serverPort = 12000
# Create a UDP socket
# Notice the use of SOCK_DGRAM for UDP packets
ClientSocket = socket(AF_INET, SOCK_DGRAM)
ClientSocket.settimeout(1)RTTList = []
RTTMin = float(1)
RTTMax = float(0)for i in range(10):# Generate random number in the range of 0 to 10 rand = random.randint(0, 10)     # If rand is less is than 4, we consider the packet lost and do not respond if rand < 4: continue # Otherwise, the server responds     try:oldTime = time.time()sendTime = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(oldTime))message = 'package %d, client local time:%s' % (i + 1, sendTime)ClientSocket.sendto(message.encode(), (serverName, serverPort))modifiedMessage, serverAddress = ClientSocket.recvfrom(1024)rtt = time.time() - oldTimeRTTList.append(rtt)RTTMax = max(rtt, RTTMax)RTTMin = min(rtt, RTTMin)print("Ping %d %s RTT:%f" % (i + 1, modifiedMessage.decode(), rtt))except Exception as e:print('Request timed out')print("\n>> Summary: RTT Min: %f, RTT Max %f, RTT Mean: %f" % (RTTMin, RTTMax, sum(RTTList) / len(RTTList)))

作业3：邮件客户

from pydoc import cli
from socket import *
import base64subject = "I love computer networks!"
contenttype = "text/plain"
msg = "\r\n I love computer networks!"
endmsg = "\r\n.\r\n" # Choose a mail server (e.g. Google mail server) and call it mailserver
mailserver = "smtp.163.com" #Fill in start   #Fill in end
# Create socket called clientSocket and establish a TCP connection with mailserver #Fill in start   fromAddress = '******@163.com'
toAddress = '******@qq.com'username = base64.b64encode(fromAddress.encode()).decode()
passwd = base64.b64encode('******'.encode()).decode()clientSocket = socket(AF_INET, SOCK_STREAM)
clientSocket.connect((mailserver, 25))#Fill in end
recv = clientSocket.recv(1024).decode()
print(recv)
if recv[:3] != '220': print('220 reply not received from server.') # Send HELO command and print server response.
heloCommand = 'HELO Alice\r\n'
clientSocket.send(heloCommand.encode())
recv1 = clientSocket.recv(1024).decode()
print(recv1)
if recv1[:3] != '250': print('250 reply not received from server.') # Auth
clientSocket.send('AUTH LOGIN\r\n'.encode())
recv = clientSocket.recv(1024).decode()
print(recv)
if recv[:3] != '334':print('334 reply not received from server.') clientSocket.send((username + '\r\n').encode())
recv = clientSocket.recv(1024).decode()
print(recv)
if recv[:3] != '334':print('334 reply not received from server.') clientSocket.send((passwd + '\r\n').encode())
recv = clientSocket.recv(1024).decode()
print(recv)
if recv[:3] != '235':print('235 reply not received from server.') # Send MAIL FROM command and print server response.
# Fill in start
MailFromCommand = 'MAIL FROM: <' + fromAddress + '>\r\n'
clientSocket.sendall(MailFromCommand.encode())
recv = clientSocket.recv(1024).decode()
print(recv)
if recv[:3] != '250': print('250 reply not received from server.')
# Fill in end # Send RCPT TO command and print server response.
# Fill in start
RcptTo = 'RCPT TO: <' + toAddress + '>\r\n'
clientSocket.sendall(RcptTo.encode())
recv = clientSocket.recv(1024).decode()
print(recv)
if recv[:3] != '250': print('250 reply not received from server.')
# Fill in end # Send DATA command and print server response.
# Fill in start
Data = 'DATA\r\n'
clientSocket.send(Data.encode())
recv = clientSocket.recv(1024).decode()
print(recv)
if recv[:3] != '354': print('354 reply not received from server.')
# Fill in end # Send message data.
# Fill in start
Message = 'from:' + fromAddress + '\r\n'
Message += 'to:' + toAddress + '\r\n'
Message += 'subject:' + subject + '\r\n'
Message += 'Content-Type:' + contenttype + '\t\n'
Message += msg
clientSocket.sendall(Message.encode())
# Fill in end
# Message ends with a single period.
# Fill in start
clientSocket.sendall(endmsg.encode())
recv = clientSocket.recv(1024).decode()
print(recv)
if recv[:3] != '250':print('250 reply not received from server.')
# Fill in end # Send QUIT command and get server response.
# Fill in start
QuitMsg = 'QUIT'
clientSocket.send(QuitMsg.encode())clientSocket.close()
# Fill in end

作业4：多线程Web代理服务器

from socket import *
import sys if len(sys.argv) <= 1: print('Usage : "python ProxyServer.py server_ip"\n[server_ip : It is the IP Address Of Proxy Server') sys.exit(2) # Create a server socket, bind it to a port and start listening
tcpSerSock = socket(AF_INET, SOCK_STREAM)
# Fill in start.
tcpSerPort = 8899
tcpSerSock.bind(('', tcpSerPort))
tcpSerSock.listen(5)
# Fill in end. while True: # Strat receiving data from the client print('Ready to serve...') tcpCliSock, addr = tcpSerSock.accept() print('Received a connection from:', addr) message = tcpCliSock.recv(4096).decode() # Fill in start.   # Fill in end. print(message) # Extract the filename from the given message print(message.split()[1]) filename = message.split()[1].partition("/")[2] print(filename) fileExist = "false" filetouse = "/" + filename print(filetouse) try: # Check wether the file exist in the cache f = open(filetouse[1:], "r")                       outputdata = f.readlines()                         fileExist = "true" print('File Exists!')# ProxyServer finds a cache hit and generates a response message tcpCliSock.send("HTTP/1.0 200 OK\r\n")             tcpCliSock.send("Content-Type:text/html\r\n") # Fill in start. for i in range(0, len(outputdata)):tcpCliSock.send(outputdata[i].encode())# Fill in end. print('Read from cache')    # Error handling for file not found in cache except IOError: if fileExist == "false":  # Create a socket on the proxyserver print('Creating socket on proxyserver')c = socket(AF_INET, SOCK_STREAM) # Fill in start.   # Fill in end. hostn = filename.replace("www.","",1)          print(hostn)                                   try: # Connect to the socket to port 80 # Fill in start.   c.connect((hostn, 80))print('Socket connected to port 80 if the host')c.sendall(message.encode())# Fill in end. # Create a temporary file on this socket and ask port 80 for the file requested by the client fileobj = c.makefile('r', 0)                fileobj.write("GET  "+"http://"  +  filename  +  " HTTP/1.0\n\n")   # Read the response into buffer # Fill in start.   buff = c.recv(4096)tcpCliSock.sendall(buff)# Fill in end. # Create a new file in the cache for the requested file.  # Also send the response in the buffer to client socket and the corresponding file in the cache tmpFile = open("./" + filename,"wb")   # Fill in start.   tmpFile.writelines(buff.decode().replace('\r\n', '\n'))tmpFile.close()# Fill in end.    except: print("Illegal request")                                                else: # HTTP response message for file not found # Fill in start.   print('File Not Found...Stupid Andy')# Fill in end. # Close the client and the server sockets     tcpCliSock.close()
# Fill in start.
tcpSerSock.close()
# Fill in end.

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计算机网络自顶向下-套接字编程作业

作业1：Web服务器

作业2：UDP ping程序

作业3：邮件客户

作业4：多线程Web代理服务器

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