再发送数据

Question

所以我想在发送多个数据包又一遍我的虚拟机，但一次尝试之后，我得到的错误：

Traceback (most recent call last): 
    File "SMB_Test2.py", line 157, in <module> 
    s.sendall(SMB_COM_NEGOTIATE) 
    File "C:\Python27\Lib\socket.py", line 228, in meth 
    return getattr(self._sock,name)(*args) 
socket.error: [Errno 10054] An existing connection was forcibly closed by the remote host 

，我推测是由于重复畸形数据被发送（有意），但我想知道是否以及如何解决这个问题。我基本上希望多次发送SMB_COM_NEGOTIATE。提前致谢。

import socket 
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
s.connect((addr, port)) 
s.settimeout(2) 

print '[*] Connected to "%s:%d".' % (addr, port) 
s.sendall(SMB_COM_NEGOTIATE) 
a = 0 
while a != 50000: 
    print a 
    a = a + 1 
    s.sendall(SMB_COM_NEGOTIATE) 
    print '[*] Sent to "%s:%d".' % (addr, port) 

EDIT（关闭詹姆斯的建议） - 静止跳转权利一个错误：

a = 0 
try: 
    print "The value of 'a' is %r." % a 
    s.connect((addr, port)) 
    print '[*] Connected to "%s:%d".' % (addr, port) 
    while a != 50000: 
     a = a + 1 
     s.sendall(SMB_COM_NEGOTIATE) 
     print '[*] Sent to "%s:%d".' % (addr, port) 
     print "The value 'a' is %r." % a 
except: 
    print "[-] An error occured!!!" 
    s.close() 
    exit() 

输出：

The value of 'a' is 0. 
[*] Connected to "192.168.xxx.xxx:xxx". 
[*] Sent to "192.168.xxx.xxx:xxx". 
The value 'a' is 1. 
[-] An error occured!!! 

还试图此（几乎相同）：

a = 0 
print "The value of 'a' is %r." % a 
s.connect((addr, port)) 
print '[*] Connected to "%s:%d".' % (addr, port) 
def ok(): 
    try: 
     while a != 50000: 
      a = a + 1 
      s.sendall(SMB_COM_NEGOTIATE) 
      print '[*] Sent to "%s:%d".' % (addr, port) 
      print "The value 'a' is %r." % a 
    except: 
     print "[-] An error occured!!!" 
     sleep(0) 
     s.close() 

其中有一个输出（甚至不发送什么东西）：

The value of 'a' is 0. 
[*] Connected to "192.168.xxx.xxx:xxx". 
[-] An error occurred!!! 

Answer 1

这是一个代码片段来说明我的评论。

import socket 

def try_connect(): 
    """Tries to connect and send the SMB_COM_NEGOTIATE bytes. 
     Returns the socket object on success and None on failure. 
    """ 
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
    s.settimeout(2) 
    try: 
     s.connect((addr, port)) 
     s.sendall(SMB_COM_NEGOTIATE) 
    except socket.timeout as e: 
     # got a socket timeout 
     return None 
    except OSError as e: 
     # got some other socket error 
     return None 
    return s 

def try_connect_n_times(n): 
    """Try up to n times to connect""" 
    for attempt in range(n): 
     s = try_connect() 
     if s: 
      return s 
    return None 

try_connect_n_times(5000)