Python：获取默认网关的MAC地址 [英] Python: get MAC address of default gateway

问题描述

在Python中有没有快速获取默认网关的 MAC地址的方法？

Is there any quick way in Python to get the MAC address of the default gateway?

我无法从 Linux 计算机上执行任何 ARP请求我正在运行我的代码，所以它必须直接来自 ARP表。

I can't make any ARP requests from the Linux machine I'm running my code on, so it has to come directly from the ARP table.

推荐答案

以下DevFS文件将提供此信息：

The following DevFS files will provide this information:

/proc/net/arp
/proc/net/route

找到0/0作为主机/掩码的路由条目：

Find the route entry with 0/0 as the host/mask:

Iface   Destination     Gateway         Flags   RefCnt  Use     Metric  Mask            MTU     Window  IRTT                                                       
eth0    00000000        B91A210A        0003    0       0       100     00000000        0       0       0                                                                             

并转换网关字段（它是小端十六进制...... grr）：

and convert the Gateway field (it's in little-endian hex... grr):

import struct
from IPy import IP
address = IP(struct.unpack('<I', struct.pack('>I', int(i, 16)))[0])
#Converts 'B91A210A' to IP('10.33.26.185')

从那里，你可以在arp表中找到你的默认网关：

From there, you can find your default gateway in the arp table:

IP address       HW type     Flags       HW address            Mask     Device
10.33.26.185     0x1         0x2         e6:92:ec:f5:af:f7     *        eth0

如果没有显示，请发出一次ping，然后再次检查，然后失败。

If it doesn't show up, issue a single ping, then check again, then fail.

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