如何自动获得 IP 地址更改通知 [英] how to get notified for IP address changes automatically

问题描述

在 linux 中是否有任何方法，例如回调或信号，以便在 IP 地址发生任何变化时获得通知.我想向内核注册回调或从内核获取信号，这是自动完成的，而不是我的代码在套接字上轮询.

In linux is there any method like callback or signal to get notified whenever there is any change in the IP Address. I want to register a callback with with kernel or get a signal from kernel which is done automatically rather my code polling on the socket.

提前致谢.

推荐答案

您通过 netlink 套接字接收来自内核的通知.

You receive notifications from the kernel via netlink sockets.

您需要创建一个 NETLINK_ROUTE 套接字并通过 bind() 将其订阅到 RTMGRP_IPV4_IFADDR 组来订阅 IP 更改.然后，您将收到 RTM_NEWADDR 和 RTM_DELADDR 类型的 netlink 消息，路由属性为 IFA_LOCAL 或 IFA_ADDRESS.

You would need to create a NETLINK_ROUTE socket and subscribe it to IP changes via bind()ing it to the RTMGRP_IPV4_IFADDR group. Then, you'll receive netlink messages of type RTM_NEWADDR and RTM_DELADDR with a route attribute of IFA_LOCAL or IFA_ADDRESS.

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