计算机网络实验：搭建一个简单的web server 和 SMTP 客户端。
只要熟悉了socket编程, HTTP request 、response的内容和SMTP发送的格式，一切均可以解决。
主要是状态码的识别和文件目录的提取，简单的字符串处理即可。
1.Super simple Web Server
#!usr/bin/env
# import socket module
from socket import *
serverSocket = socket(AF_INET, SOCK_STREAM)
# Prepare a sever socket
serverSocket.bind(('', 6789)) # 将TCP欢迎套接字绑定到指定端口
serverSocket.listen(5) # 最大连接数为5
while True:
# Establish the connection
print('Ready to serve...')
connectionSocket, addr = serverSocket.accept() # 接收到客户连接请求后，建立新的TCP连接套接字
try:
message = connectionSocket.recv(1024) # 获取客户发送的报文
filename = message.split()[1]
f = open(filename[1:])
outputdata = f.read()
# Send one HTTP header line into socket
header = ' HTTP/1.1 200 OK\nConnection: close\nContent-Type: text/html\nContent-Length: %d\n\n' % (
len(outputdata))
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.close()
except IOError:
# Send response message for file not found
header = ' HTTP/1.1 404 Found'
connectionSocket.send(header.encode())
# Close client socket
connectionSocket.close()
# serverSocket.close()
2.Super simple SMTP Client
from socketimport *
import logging
logging.basicConfig(filename='./SMTP_LOG'+__name__+'.log',format='[%(asctime)s-%(filename)s-%(levelname)s:%(message)s]', level = logging.INFO,filemode='a',datefmt='%Y-%m-%d%I:%M:%S %p')
msg ="\r\nI love computer networks\r\n.\r\n"
LOG_FILE ='tst.log'
mailserver = ('mail.bjtu.edu.cn', 25)
try:
clientSocket = socket(AF_INET, SOCK_STREAM)
clientSocket.connect(mailserver)
recv = clientSocket.recv(1024).decode()
logging.info(recv)
if recv[:3]!='220':
raise Exception('未与服务器连接\n')
heloCommand =b"HELO BJTU\r\n"
clientSocket.send(heloCommand)
recv1 = clientSocket.recv(1024).decode()
logging.info(recv1)
if recv[:3]!='220':
raise Exception('服务器无应答\n')
clientSocket.send(b"auth login\r\n")
auth_recv = clientSocket.recv(1024).decode()
if auth_recv[:3] !='334':
raise Exception('登陆失败\n')
mail_id =b"就不告诉你\r\n"
mail_password =b"知道了也没用\r\n"
clientSocket.send(mail_id)
recv_id = clientSocket.recv(1024).decode()
if recv_id[:3] !='334':
raise Exception('用户ID错误!\n')
logging.info(recv_id)
clientSocket.send(mail_password)
recv_pass = clientSocket.recv(1024).decode()
logging.info(recv_pass)
if recv_pass[:3]!='235':
raise Exception('用户密码错误!\n')
else:
print('Login successfully!')
mail_from =b"MAIL FROM: <[email protected]>\r\n"
clientSocket.send(mail_from)
recv2 = clientSocket.recv(1024).decode()
logging.info(recv2)
if recv2[:3] !='250':
raise Exception('MAIL FROM 输入错误！\n')
RCPT_TO =b"RCPT TO: <[email protected]>\r\n"
clientSocket.send(RCPT_TO)
recv3 = clientSocket.recv(1024).decode()
if recv3[:3] !='250':
raise Exception('RCPT TO输入错误！\n')
logging.info(recv3)
DATA =b"DATA\r\n"
clientSocket.send(DATA)
recv4 = clientSocket.recv(1024).decode()
if recv4[:3] !='354':
raise Exception('蜜汁错误！\n')
logging.info(recv4)
clientSocket.send(msg.encode())
recv5 = clientSocket.recv(1024).decode()
if recv5[:3] !='250':
raise Exception('信息传送错误！\n')
logging.info(recv5)
QUIT =b"QUIT\r\n"
clientSocket.send(QUIT)
recv6 = clientSocket.recv(1024).decode()
if recv6[:3] !='221':
raise Exception('退出错误！\n')
clientSocket.send(QUIT)
print("Successful!")
except Exception as e:
print('Exception Occur')
logging.exception(e)
其中SMTP部分的代码加入了异常处理和Log的初步使用，为今后的软件开发奠定基础