python - netstat 无法与 popen 一起正常工作

Question

使用 Python 运行此命令时

p = Popen(['netstat', '-atunp'], shell=True, stdout=PIPE, stderr=PIPE)
stdout, stderr = p.communicate()
print stdout

我得到了不同的输出。也就是说，如果我从命令行运行相同的命令，我可以看到 IP 地址和应用程序名称，而使用 Python 则看不到。

我还需要做什么才能查看 IP 地址和应用名称吗？

Answer 1

我想我在没有 -p 标志的情况下运行了你的命令。该标志需要一个协议(protocol)。这可能就是你的标准输出字符串为空的原因；另一方面，stderr 会出现错误 -

In [86]: stderr
Out[86]: 'netstat: option requires an argument -- p\nUsage:\tnetstat [-AaLlnW] [-f address_family | -p protocol]\n\tnetstat [-gilns] [-f address_family]\n\tnetstat -i | -I interface [-w wait] [-abdgRt]\n\tnetstat -s [-s] [-f address_family | -p protocol] [-w wait]\n\tnetstat -i | -I interface -s [-f address_family | -p protocol]\n\tnetstat -m [-m]\n\tnetstat -r [-Aaln] [-f address_family]\n\tnetstat -rs [-s]\n\n'

因此，像这样更新您的命令(删除 shell=True 并添加协议(protocol)作为参数) -

In [87]: paste
p = Popen(['netstat', '-atunp', 'tcp'], stdout=PIPE, stderr=PIPE)
stdout, stderr = p.communicate()
print stdout

## -- End pasted text --
Active Internet connections (including servers)
Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)    
tcp4       0      0  192.168.1.100.53076    198.252.206.140.80     ESTABLISHED
tcp4       0      0  192.168.1.100.53075    198.252.206.140.80     ESTABLISHED
tcp4       0      0  192.168.1.100.53004    216.58.220.3.443       ESTABLISHED
tcp4       0      0  192.168.1.100.52984    74.125.200.155.443     ESTABLISHED
tcp4       0      0  192.168.1.100.52954    198.252.206.149.443    ESTABLISHED
tcp4       0      0  192.168.1.100.52927    91.189.89.222.443      FIN_WAIT_1 
tcp4       0      0  192.168.1.100.52925    173.194.120.144.443    ESTABLISHED
tcp4       0      0  192.168.1.100.52869    74.125.130.155.443     ESTABLISHED
tcp4       0      0  192.168.1.100.52863    74.125.68.139.443      ESTABLISHED
tcp4       0      0  192.168.1.100.52858    74.125.130.102.443     ESTABLISHED
tcp4       0      0  192.168.1.100.52851    74.125.68.93.443       ESTABLISHED
tcp4       0      0  192.168.1.100.52847    74.125.200.132.443     ESTABLISHED
tcp4       0      0  192.168.1.100.52814    216.58.216.163.443     ESTABLISHED
tcp4       0      0  192.168.1.100.52812    74.125.68.189.443      ESTABLISHED
tcp4       0      0  192.168.1.100.52794    74.125.130.17.443      ESTABLISHED
tcp4       0      0  192.168.1.100.52793    198.252.206.149.443    ESTABLISHED
tcp4       0      0  192.168.1.100.52761    74.125.68.138.443      ESTABLISHED
tcp4       0      0  192.168.1.100.52737    74.125.68.132.443      ESTABLISHED
tcp4       0      0  192.168.1.100.52577    17.172.232.205.443     ESTABLISHED
tcp4       0      0  192.168.1.100.52571    74.125.130.188.443     ESTABLISHED
tcp6       0      0  fd9a:f3a0:3346:7.4488  *.*                    LISTEN     
tcp4       0      0  *.*                    *.*                    CLOSED     
tcp4       0      0  127.0.0.1.631          *.*                    LISTEN     
tcp6       0      0  ::1.631                *.*                    LISTEN