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dotslash
Asked: 2016-06-25 10:58:03 +0800 CST

如何动态查看 dnsmasq 客户端 MAC 地址？

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如果我已经知道客户端 IP，我知道有/var/log/dnsmasq.log，并且它包含日志，例如

6 月 13 日 12:22:42 dnsmasq-dhcp[499]: DHCPACK(wlan0) 172.24.1.110 34:12:98:11:80:bd 个-iPad
6 月 13 日 13:19:44 dnsmasq-dhcp[499]: DHCPDISCOVER (wlan0) d4:97:32:61:4f:73
Jun 13 13:19:44 dnsmasq-dhcp[499]: DHCPOFFER(wlan0) 172.24.1.82 d4:97:0b:61:4f:23
Jun 13 13: 19:44 dnsmasq-dhcp[499]: DHCPREQUEST(wlan0) 172.24.1.82 d4:97:9f:61:4f:73
Jun 13 13:19:44 dnsmasq-dhcp[499]: DHCPACK(wlan0) 172.24.1.82 d4 :97:0b:23:4f:73 android-ef9f423f7ecaca3c

在路由器中

这样，我们每次都可以解析日志，看到最新的MAC地址。

但是不用每次都解析这么长的大文件，我们能知道客户端mac是什么吗？它拖累CPU。

谢谢！

更新

我找到了另一个包含它的地方

cat /var/lib/misc/dnsmasq.leases

仍然是一个文件。还是我每次都必须解析文件？

linux logging mac-address dnsmasq hostapd

1 个回答

  1. Best Answer

    在 dnsmasq 的手册页中有一个选项说

    -l, --dhcp-leasefile=<path>
    Use the specified file to store DHCP lease information.

    因此，您可以使用文件来记录它。文件的格式是：

     946689575 00:00:00:00:00:05 192.168.1.155 wdt 01:00:00:00:00:00:05
 946689522 00:00:00:00:00:04 192.168.1.237 * 01:00:00:00:00:00:04
 946689351 00:0f:b0:3a:b5:0b 192.168.1.208 colinux *
 946689493 02:0f:b0:3a:b5:0b 192.168.1.199 * 01:02:0f:b0:3a:b5:0b

    每行的字段：

     1) Time of lease expiry, in epoch time (seconds since 1970). BTW you
 seem to be living in the past: most of us are well past 1000000000
 seconds by now :-) . There are compile time options in dnsmasq which
 convert this field to be remaining lease time (in seconds) or, in the
 most recent releases, total lease renewal time.

 2) MAC address.

 3) IP address.

 4) Computer name, if known. This is always unqualified (no domain part)

 5) Client-ID, if known. The client-ID is used as the computer's
 unique-ID in preference to the MAC address, if it's available. Some DHCP
 clients provide it, and some don't. The ones that do normally derive it
 from the MAC address unless explicity configured, but it could be
 something like a serial number, which would protect a computer from
 losing its identify if the network interface were replaced.

    行的顺序没有意义，并且会随着时间而改变。

    • 1

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