im trying to get in c programing (LINUX) what kind of ip I have DHCP or static. Does someone know how do that?? I extract my ip using struct ifaddrs; it will be nice to find out if that stucture can provide the information. thanks on advance :)
discover if ip address is DHCP or static
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That property is not something you can deduce statically from the IP address alone.
You can probably make a guess by determining if the IP address is in the "non-routable" series (10.x.y.z or 192.168.x.y), but the address could just as well have been manually assigned.
Figuring out if the system has a current lease from a DHCP server is (very) platform-dependent, and will require information that is not in the IP address itself.