本文實例為大家分享了python實現簡單tftp的具體代碼，供大家參考，具體內容如下

tftp服務器簡單實現：

from threading import Threadfrom socket import *import structdef upload(filename,user_ip,user_port): num = 0 f = open(filename,'ab')  s_up = socket(AF_INET,SOCK_DGRAM) send_data_1 = struct.pack("!HH",4,num) s_up.sendto(send_data_1,(user_ip,user_port)) #第一次用隨機端口發送 while True:  recv_data,user_info = s_up.recvfrom(1024) #第二次客戶連接我隨機端口  caozuohao_up,ack_num = struct.unpack('!HH',recv_data[:4])  print(caozuohao_up,ack_num,num)  if int(caozuohao_up) == 3 and ack_num == num :   f.write(recv_data[4:])   send_data = struct.pack("!HH",4,num)   s_up.sendto(send_data,(user_ip,user_port)) #第二次我用隨機端口發   num = num + 1   if len(recv_data) < 516:    print(user_ip+'上傳文件'+filename+':完成')    f.close()    exit()  def download(filename,user_ip,user_port): s_down = socket(AF_INET, SOCK_DGRAM) num = 0 try:  f = open(filename,'rb') except:  error_data = struct.pack('!HHHb',5,5,5,num)  s_down.sendto(error_data, (user_ip,user_port)) #文件不存在時發送  exit() #只會退出此線程 while True:  read_data = f.read(512)  send_data = struct.pack('!HH',3,num) + read_data  s_down.sendto(send_data, (user_ip,user_port)) #數據第一次發送  if len(read_data) < 512:   print('傳輸完成, 對方下載成功')   exit()    recv_ack = s_down.recv(1024) #第二次接收  caozuoma,ack_num = struct.unpack("!HH", recv_ack)#  print(caozuoma,ack_num,len(read_data))  num += 1  if int(caozuoma) != 4 or int(ack_num) != num-1 :   exit() f.close()s = socket(AF_INET,SOCK_DGRAM)s.bind(('',69))def main(): while 1:  recv_data,(user_ip,user_port) = s.recvfrom(1024) #第一次客戶連接69端口  print(recv_data, user_ip, user_port)  if struct.unpack('!b5sb',recv_data[-7:]) == (0, b'octet', 0):   caozuoma = struct.unpack('!H',recv_data[:2])   filename = recv_data[2:-7].decode('gb2312')   if caozuoma[0] == 1:    print('對方想下載數據',filename)    t = Thread(target = download, args = (filename,user_ip,user_port))     t.start()      elif caozuoma[0] == 2:    print('對方想上傳數據',filename)    t = Thread(target = upload, args = (filename,user_ip,user_port))     t.start()   if __name__ == '__main__': main()

上傳數據簡單實現：

#!/usr/bin/env python3#coding=utf-8import structfrom socket import *server_ip = '192.168.119.157'send_data_1 = struct.pack('!H8sb5sb',2,'王輝.jpg'.encode('gb2312'),0,b'octet',0)s = socket(AF_INET,SOCK_DGRAM)s.sendto(send_data_1,(server_ip,69)) #第一次發給服務器69端口f = open('王輝.jpg','rb')recv_data = s.recvfrom(1024) #第一次接收數據rand_port = recv_data[1][1]print()ack_num = struct.unpack("!HH",recv_data[0][:4])num = 0while True: read_data = f.read(512) send_data = struct.pack('!HH',3,num) + read_data s.sendto(send_data,(server_ip,rand_port)) #第二次發給服務器的隨機端口 recv_data_2,userinfo = s.recvfrom(1024) print(recv_data_2) ack_num = struct.unpack('!H',recv_data_2[2:4]) print(len(read_data),num,ack_num[0],rand_port) if len(read_data) < 512 or ack_num[0] != num :  break num = num + 1