1. md5加密回顾:
import hashlib m=hashlib.md5() #创建md5对象
m.update(b'abcd') #生成加密串
m.update(b'efg')
print(m.hexdigest()) #打印加密串
m2=hashlib.md5()
m2.update(b'abcdefg')
print(m2.hexdigest())
7ac66c0f148de9519b8bd264312c4d64
7ac66c0f148de9519b8bd264312c4d64
FTP-Server
1.读取文件名
2.检测文件是否存在
3.打开文件
4.检测文件大小
5.发送文件大小给客户端
6.等待客户端确定,防止粘包
7.开始边读边发数据
8.发送md5
9.关闭文件
2. FTP入门版:
服务器端:
import socket,os,time,hashlib server=socket.socket()
server.bind(('localhost',9999))
server.listen()
while True:
conn,addr=server.accept()
print("new connection is :",addr)
while True:
data=conn.recv(1024)
if not data:
print("客户端已经断开")
break
cmd,filename=data.decode().split() #分割get hash.py,把get赋值给cmd,把hash.py赋值给filename
print(filename)
if os.path.isfile(filename): #判断是否是文件
f=open(filename,'rb') #以二进制,读模式打开文件
m=hashlib.md5() #创建md5对象
file_size=os.stat(filename).st_size #获取文件大小
conn.send(str(file_size).encode()) #给客户端发送文件大小
conn.recv(1024) #等待客户端的确认
for line in f:
conn.send(line)
f.close() server.close()
客户端:
import socket client=socket.socket()
client.connect(('localhost',9999))
while True:
cmd=input(">>:").strip()
if len(cmd)==0:
continue
if cmd.startswith('get'): #代表接收什么文件
client.send(cmd.encode())
server_response=client.recv(1024) #接收的是文件大小
print("server response:",server_response)
client.send(b'ready to recv file') #给服务器端发确认信息,已经收到文件大小
file_total_size=int(server_response.decode())
received_size=0
filename=cmd.split()[1]
f=open(filename+'.new','wb') #以二进制打开一个文件,只用于写入。
while received_size<file_total_size:
data=client.recv(1024)
received_size=received_size+len(data)
f.write(data)
print(file_total_size,received_size)
else:
print('file recv done')
f.close() client.close()
客户端的输入及运行结果:
>>:get hash.py
server response: b'211'
211 211
file recv done
>>:
服务器端的运行结果:
new connection is : ('127.0.0.1', 65194)
hash.py
3. FTP+MD5验证
服务器端:
import socket,os,time,hashlib server=socket.socket()
server.bind(('localhost',9999))
server.listen()
while True:
conn,addr=server.accept()
print("new connection is :",addr)
while True:
data=conn.recv(1024)
if not data:
print("客户端已经断开")
break
cmd,filename=data.decode().split()
print(filename)
if os.path.isfile(filename): #判断是否是文件
f=open(filename,'rb') #打开文件
m=hashlib.md5() #创建md5对象
file_size=os.stat(filename).st_size #获取文件大小
conn.send(str(file_size).encode()) #发送文件大小
conn.recv(1024) #等待客户端的确认
for line in f:
m.update(line) #生产加密串
conn.send(line)
print('file md5',m.hexdigest())
f.close()
conn.send(m.hexdigest().encode('utf-8')) #send md5 server.close()
客户端:
import socket,hashlib
import hashlib client=socket.socket()
client.connect(('localhost',9999))
while True:
cmd=input(">>:").strip()
if len(cmd)==0:
continue
if cmd.startswith('get'): #代表接收什么文件
client.send(cmd.encode())
server_response=client.recv(1024)
print("server response:",server_response) #接收的是文件大小
client.send(b'ready to recv file')
file_total_size=int(server_response.decode())
received_size=0
filename=cmd.split()[1]
f=open(filename+'.new','wb')
m=hashlib.md5() while received_size<file_total_size:
data=client.recv(1024)
received_size=received_size+len(data)
f.write(data)
m.update(data)
#print(file_total_size,received_size)
else:
new_file_md5=m.hexdigest()
print('file recv done',received_size,file_total_size)
f.close()
server_file_md5=client.recv(1024)
print('server file md5:',server_file_md5)
print('client file md5:',new_file_md5) client.close()
服务器端运行结果:
new connection is : ('127.0.0.1', 65466)
hash.py
file md5 5dbf115019480585de4d39cd175184db
客户端运行结果:
>>:get hash.py
server response: b'211'
file recv done 211 211
server file md5: b'5dbf115019480585de4d39cd175184db'
client file md5: 5dbf115019480585de4d39cd175184db
4.FTP+MD5验证+粘包处理:
服务器端:
import socket,os,time,hashlib server=socket.socket()
server.bind(('localhost',9999))
server.listen()
while True:
conn,addr=server.accept()
print("new connection is :",addr)
while True:
data=conn.recv(1024)
if not data:
print("客户端已经断开")
break
cmd,filename=data.decode().split()
print(filename)
if os.path.isfile(filename): #判断是否是文件
f=open(filename,'rb') #打开文件
m=hashlib.md5() #创建md5对象
file_size=os.stat(filename).st_size #获取文件大小
conn.send(str(file_size).encode()) #发送文件大小
conn.recv(1024) #等待客户端的确认
for line in f:
m.update(line) #生产加密串
conn.send(line)
print('file md5',m.hexdigest())
f.close()
conn.send(m.hexdigest().encode('utf-8')) #send md5 server.close()
客户端:
import socket,hashlib
import hashlib client=socket.socket()
client.connect(('localhost',9999))
while True:
cmd=input(">>:").strip()
if len(cmd)==0:
continue
if cmd.startswith('get'): #代表接收什么文件
client.send(cmd.encode())
server_response=client.recv(1024)
print("server response:",server_response) #接收的是文件大小
client.send(b'ready to recv file')
file_total_size=int(server_response.decode())
received_size=0
filename=cmd.split()[1]
f=open(filename+'.new','wb')
m=hashlib.md5() while received_size<file_total_size:
if file_total_size-received_size>1024: #要收不止一次
size=1024
else: #最后一次了,剩多少收多少
size=file_total_size-received_size
print("last receive:",size)
data=client.recv(size)
received_size=received_size+len(data)
f.write(data)
m.update(data)
#print(file_total_size,received_size)
else:
new_file_md5=m.hexdigest()
print('file recv done',received_size,file_total_size)
f.close()
server_file_md5=client.recv(1024)
print('server file md5:',server_file_md5)
print('client file md5:',new_file_md5) client.close()
服务器端的输出:
new connection is : ('127.0.0.1', 56460)
hash.py
file md5 5dbf115019480585de4d39cd175184db
客户端的输出:
>>:get hash.py
server response: b'211'
last receive: 211
last receive: 2
file recv done 211 211
server file md5: b'5dbf115019480585de4d39cd175184db'
client file md5: 5dbf115019480585de4d39cd175184db