0. 我們如何通過郵件系統完成遠程控制電腦（關機、重啟等）？

實現思路：

需要有兩個郵箱：接收指令郵箱（A）發送指令郵箱（B）

被控制的電腦（查看 A 郵箱）：
1. 每隔指定時間監聽 A 郵箱 查看最近的郵件
2. 打開最近郵件，看是否是 B 郵箱地址發來的執行命令
3. 向 A 和 B 郵箱都發送 主題為：反饋 內容為：“目標計算機已收到指令！開始執行：xxx 指令！” 郵件
4. 執行指定郵箱發送的執行命令

遠程人員操作：

登錄 B 郵箱，向 A 郵箱發送 主題為：“目標計算機執行” 內容為：xxx指令（例如：關機）

1. 代碼編寫

import poplibimport smtplibimport osimport timefrom email.parser import Parserfrom email.header import decode_headerfrom email.utils import parseaddrfrom email.mime.text import MIMETextfrom email.header import Header email_params = dict()email_params['email_message'] = '反饋'email_params['email_subject'] = '目標計算機反饋'email_params['email_from'] = 'A郵箱'email_params['email_user'] = 'A郵箱'email_params['email_exec'] = 'B郵箱'email_params['email_to'] = ['A郵箱', 'B郵箱']email_params['email_smtp'] = 'smtp.163.com'email_params['email_pop'] = 'pop.163.com'email_params['email_pass'] = 'A郵箱的密碼（smtp、pop3的密碼）'interval_time = 5  def decode_str(s):  value, charset = decode_header(s)[0]  if charset:    value = value.decode(charset)  return value  def get_headers(message):  headers = dict()  for header in ['From', 'To', 'Subject']:    value = message.get(header, '')    if value:      if header == 'Subject':        headers['Subject'] = decode_str(value)      elif header == 'From':        hdr, addr = parseaddr(value)        headers['From'] = decode_str(addr)      elif header == 'To':        hdr, addr = parseaddr(value)        headers['To'] = decode_str(addr)  return headers  def guess_charset(message):  charset = message.get_charset()  if charset is None:    content_type = message.get('Content-Type', '').lower()    pos = content_type.find('charset=')    if pos >= 0:      charset = content_type[pos + 8:].strip()  return charset  def get_content(message):  for part in message.walk():    content_type = part.get_content_type()    charset = guess_charset(part)    if content_type == 'text/plain' and charset:      try:        return part.get_payload(decode=True).decode(charset)      except AttributeError:        print('type error')      except LookupError:        print("unknown encoding: utf-8")  def receive_email():  email_server = poplib.POP3_SSL(email_params['email_pop'])  email_server.user(email_params['email_user'])  email_server.pass_(email_params['email_pass'])  resp, mails, octets = email_server.list()  index = len(mails)  if index == 0:    return None, None  resp, lines, octets = email_server.retr(index)  message = b'/r/n'.join(lines).decode('utf-8', 'ignore')  message = Parser().parsestr(message)  email_server.quit()  return get_headers(message), get_content(message)  def send_email(email_message):  message = MIMEText(email_message, 'plain', 'utf-8')  message['Subject'] = Header(email_params['email_subject'], 'utf-8')  message['From'] = Header(email_params['email_from'])  message['To'] = Header(','.join(email_params['email_to']), 'utf-8')   email_server = smtplib.SMTP_SSL(email_params['email_smtp'])  email_server.login(email_params['email_from'], email_params['email_pass'])  email_server.sendmail(email_params['email_from'], email_params['email_to'], message.as_string())  email_server.close()  def exec_operator(exec_content):  if exec_content == '關機':    os.system("shutdown -s -t 1")  elif exec_content == '重啟':    os.system("shutdown -r")  else:    os.system(exec_content)  if __name__ == '__main__':  while True:    headers, content = receive_email()    if headers and content and headers['From'] == email_params['email_exec'] and headers['Subject'] == '目標計算機執行':      email_message = "目標計算機已接收到指令！開始執行: " + content + " 指令！"      send_email(email_message)      exec_operator(content)    time.sleep(interval_time)