问题描述
代码:
def ScanNetwork():
nmScan = nmap.PortScanner()
s = nmScan.scan("192.168.1.1/24",'0-4444',arguments="-O")
for host in nmScan.all_hosts():
if nmScan[host].state() == "up":
print("Host : %s (%s)" % (host,nmScan[host].hostname()))
try:
print("Version: " + s['scan'][host]['osmatch'][0]['name'] + "\nType: " + s['scan'][host]['osmatch'][0]['osclass'][0]['type'])
except:
print("An Error occured while scanning this host!\nNo extra info was collected!")
continue
for proto in nmScan[host].all_protocols():
print("---------------------------")
print("\nProtocol : %s" % proto)
lport = nmScan[host][proto].keys()
lport = sorted(lport)
for port in lport:
print("\nport: " + f'{port}' + "\tstate: " + nmScan[host][proto][port]['state'])
print("---------------------------\n")
print("\n\nScan Completed!")
ScanNetwork()
有时当 nmap 无法识别 Version 或 Os 在主机中运行时会发生异常. (这是一个 KeyError
例外)
应该处理该异常的部分是这样的:
try:
print("Version: " + s['scan'][host]['osmatch'][0]['name'] + "\nType: " + s['scan'][host]['osmatch'][0]['osclass'][0]['type'])
except:
print("An Error occured while scanning this host!\nNo extra info was collected!")
continue
我当然假设 nmap 的输出没有任何问题,我又犯了一个巨大的初学者错误,这就是我的代码卡住的原因..
注意事项:
- 我让脚本运行了一夜,因为它返回了一些有用的信息,但什么也没发生!
- 请不要告诉我我需要停止使用
nmap
模块并转向nmap3
已经让您厌倦了以上所有内容,有没有人知道如何在不卡住代码的情况下仍然处理该异常?
解决方法
在 try-except 块中运行代码时,您忘记将异常类型添加到 excpect。
这应该可以解决它:
try:
print("Version: " + s['scan'][host]['osmatch'][0]['name'] + "\n" + "Type: " + s['scan'][host]['osmatch'][0]['osclass'][0]['type'])
except KeyError:
print("An Error occured while scanning this host!\nNo extra info was collected!")
continue
如果您想捕获任何可能发生的异常(包括自定义异常),则应使用以下代码:
try:
<some critical code with possible exceptions to catch>
except Exception:
print("An exception occured")