Hi
How to know if a computer is using dhcp (dynamic ip) on a local network in C++??
thanks
bye

ofada,
there are no standard C++ calls to find that out...but,

you can check the contents of /proc/sys/net/ipv4/ip_autoconfig,
if it is 0, then you are using a static IP
if it is 1, then you are using a dynamic IP (BOOT, RARP, DHCP)
I dont trust that file though, since I use DHCP and it is 0 on my machine.

you could reach into /etc/sysconfig/network/ifcfg-eth0 (or any other legal device name) and look for the BOOTPROTO variable, which should equal DHCP. But I am not sure if each distro implements sysconfig the same, if at all.

lastly, with root access, you could parse the output of 'ifstatus' for lease information.

. . .what exactly are you trying to do?

Thanks for your reply jinksys.

I have a project to do in C/C++ which consist to detect all the hardware of a computer, his MAC address, IP (local) and to know if it is using dhcp or not.For the hardware I am using the detect library but this library doesn't allow to know the ip and if the computer is using dhcp.The program have to work on all linux computer.
Bye