仅使用 proc 获取本地网络接口地址? [英] Get local network interface addresses using only proc?

问题描述

如何仅使用 proc 获取所有网络接口的 (IPv4) 地址? 经过一些广泛的调查，我发现了以下内容:

How can I obtain the (IPv4) addresses for all network interfaces using only proc? After some extensive investigation I've discovered the following:

1. ifconfig 使用 SIOCGIFADDR，这需要打开套接字并预先了解所有接口名称.Linux 上的任何手册页中也没有记录.
2. proc 包含 /proc/net/dev，但这是一个接口统计列表.
3. proc 包含 /proc/net/if_inet6，这正是我需要的，但对于 IPv6.
4. 通常在 proc 中很容易找到接口，但很少使用实际地址，除非是某些连接的明确部分.
5. 有一个名为 getifaddrs 的系统调用，它非常类似于您希望在 Windows 中看到的神奇"功能.它也在 BSD 上实现.然而，它不是非常面向文本，这使得它很难在非 C 语言中使用.

1. ifconfig makes use of SIOCGIFADDR, which requires open sockets and advance knowledge of all the interface names. It also isn't documented in any manual pages on Linux.
2. proc contains /proc/net/dev, but this is a list of interface statistics.
3. proc contains /proc/net/if_inet6, which is exactly what I need but for IPv6.
4. Generally interfaces are easy to find in proc, but actual addresses are very rarely used except where explicitly part of some connection.
5. There's a system call called getifaddrs, which is very much a "magical" function you'd expect to see in Windows. It's also implemented on BSD. However it's not very text-oriented, which makes it difficult to use from non-C languages.

推荐答案

没有/proc/net/if_inet6 的 IPv4 模拟

There is no IPv4 analog of /proc/net/if_inet6

ifconfig 可以:

ifconfig does:

fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP)
ioctl(fd, SIOCGIFCONF, ...)

你会得到这样的东西:

ioctl(4, SIOCGIFCONF, {120, {{"lo", {AF_INET, inet_addr("127.0.0.1")}}, {"eth0", {AF_INET, inet_addr("10.6.23.69")}}, {"tun0", {AF_INET, inet_addr("10.253.10.151")}}}})

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