详解Python3的TFTP文件传输

TFTP文件传输

功能：

1、获取文件列表

2、上传文件

3、下载文件

4、退出

第一部分，TftpServer部分。

①导入相关模块

from socket import *
import os
import signal
import sys
import time

②确定文件路径

# 文件库路径 
FILE_PATH = "/home/tarena/" 

③建立一个类，用来实现服务器功能模块

class TftpServer(object): 
 def __init__(self, connfd): 
 self.connfd = connfd 
 
 def do_list(self): 
 # 获取列表 
 file_list = os.listdir(FILE_PATH) 
 # 如果对应的路径内没有文件,返回Empty 
 if not file_list: 
 self.connfd.send('Empty'.encode()) 
 return 
 # 路径存在文件,向客户端发送OK 
 else: 
 self.connfd.send(b'OK') 
 time.sleep(0.1) 
 
 files = "" 
 for file in file_list: 
 # 排除以'.'开头的隐藏文件 
 if file[0] != '.' and \ 
 os.path.isfile(FILE_PATH + file): 
 files = files + file + '#' 
 # 返回文件列表 
 self.connfd.send(files.encode()) 
 
 # 下载文件功能 
 def do_get(self, filename): 
 try: 
 fd = open(FILE_PATH + filename, 'rb') 
 except: 
 self.connfd.send("File doesn't exist".encode()) 
 return 
 # 如果能正常打开,发送OK 
 self.connfd.send(b"OK") 
 time.sleep(0.1) 
 # 开始发送文件 
 try: 
 for line in fd: 
 self.connfd.send(line) 
 fd.close() 
 except Exception as e: 
 print(e) 
 time.sleep(0.1) 
 self.connfd.send(b'##') 
 print("File send over") 
 
 # 开始上传文件 
 def do_put(self, filename): 
 try: 
 fd = open(FILE_PATH + filename, 'w') 
 except: 
 self.connfd.send("Some error") 
 # 如果能正常打开文件,则发送OK 
 self.connfd.send(b'OK') 
 # 开始发送 
 while True: 
 # data为文件内容 
 data = self.connfd.recv(1024).decode() 
 if data == "##": 
 break 
 fd.write(data) 
 fd.close() 
 print("上传完毕") 

④主流程控制

def main():
 # 创建套接字/地址/端口
 HOST = '0.0.0.0'
 PORT = 8888
 ADDR = (HOST, PORT)

 sockfd = socket()
 # 设置端口可重用
 sockfd.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
 # 绑定地址
 sockfd.bind(ADDR)
 # 设置监听队列大小
 sockfd.listen(5)

 signal.signal(signal.SIGCHLD, signal.SIG_IGN)
 print("Listen to port 8888....")

 while True:
 try:
 connfd, addr = sockfd.accept()
 except KeyboardInterrupt:
 sockfd.close()
 sys.exit("Server exit")
 except Exception as e:
 print(e)
 continue
 print("Client login:", addr)
 # 创建父子进程
 pid = os.fork()
 if pid < 0:
 print("Process creation failed")
 continue
 elif pid == 0:
 # 子进程负责请求接收和发送,所以节省资源,关闭连接套字
 sockfd.close()
 tftp = TftpServer(connfd)
 # 接收客户端请求
 while True:
 data = connfd.recv(1024).decode()
 if not data:
 continue
 # 调用do_list方法获取文件列表
 elif data[0] == 'L':
 tftp.do_list()
 # data ==> G filename
 # 文件名以G开头,以空格为间隔发送过来
 elif data[0] == 'G':
 filename = data.split(' ')[-1]
 tftp.do_get(filename)
 elif data[0] == 'P':
 filename = data.split(' ')[-1]
 tftp.do_put(filename)
 elif data[0] == 'Q':
 print("客户端退出")
 sys.exit(0)

 else:
 connfd.close()
 continue

⑤运行主控制流程，等待客户端连接

if __name__ == "__main__": 
 main() 

第二部分，TftpClient

①导入相关模块

from socket import * 
import sys 
import time 

②实现基本的请求功能

class TftpServer(object):
 def __init__(self, sockfd):
 self.sockfd = sockfd

 def do_list(self):
 self.sockfd.send(b"L") # 发送请求类型
 # 等待接收服务器端确认
 data = self.sockfd.recv(1024).decode()
 if data == 'OK':
 data = self.sockfd.recv(4096).decode()
 files = data.split('#')
 for file in files:
 print(file)
 print("%%%%%There is file list%%%%%\n")
 else:
 # 失败的原因由服务器发送过来
 print(data)

 def do_get(self, filename):
 self.sockfd.send(('G '+filename).encode())
 data = self.sockfd.recv(1024).decode()
 if data == 'OK':
 fd = open(filename, 'w')
 while True:
 data = self.sockfd.recv(1024).decode()
 if data == "##":
 break
 fd.write(data)
 fd.close()
 print("%s Download over\n" % filename)
 else:
 print(data)

 def do_put(self, filename):
 try:
 fd = open(filename, 'rb')
 except:
 print("There is no such file")
 return
 self.sockfd.send(("P " + filename).encode())
 data = self.sockfd.recv(1024).decode()
 if data == 'OK':
 for line in fd:
 self.sockfd.send(line)
 fd.close()
 time.sleep(0.1)
 self.sockfd.send(b'##')
 print("%s upload over" % filename)
 else:
 print(data)

 def do_quit(self):
 self.sockfd.send(b'Q')

③主流程控制

# 套接字连接
def main():
 if len(sys.argv) < 3:
 print("argv is error")
 return
 HOST = sys.argv[1]
 PORT = int(sys.argv[2])
 ADDR = (HOST, PORT)

 sockfd = socket()
 sockfd.connect(ADDR)

 tftp = TftpServer(sockfd) # tftp对象调用请求方法

 while True:
 print("=======命令选项========")
 print("******* list *********")
 print("*******get file ******")
 print("*******put file ******")
 print("******* quit *********")
 print("======================")

 cmd = input("请输入命令>>")

 if cmd.strip() == 'list':
 tftp.do_list()
 elif cmd[:3] == "get":
 filename = cmd.split(' ')[-1]
 tftp.do_get(filename)
 elif cmd[:3] == "put":
 filename = cmd.split(' ')[-1]
 tftp.do_put(filename)
 elif cmd.strip() == "quit":
 tftp.do_quit()
 sockfd.close()
 sys.exit("Welcome")
 else:
 print("Enter the right order!!!")
 continue

④运行客户端

if __name__ == "__main__": 
 main() 

第三部分，展示

一下就不做逐一显示，如有问题，烦请之处修正，共同进步！