c++ linux - getting the interface from IP

in C++ linux application, how can I get the network interface reffering to each IP on my machine? IP contains: static IP and dy开发者_运维百科namic IP

Note: I can't use the system call getnameinfo

10x

You can use the getifaddrs call; however, note that this only retrieves one address per interface. If that's not sufficient, use the rtnetlink protocol over a netlink socket; libnetlink may make this easier.

It's quite tricky to do this, I believe you need to have root access. You need to issue an ioctl (something like SIOCGIFCONF) which then returns you a list of all interfaces, and then you can issue further ioctl calls to extract status information, etc.