On 10/24/06, Girish Venkatachalam <[EMAIL PROTECTED]> wrote:
Dear friends,I know this question sounds basic but it is not. How to programmatically determine the IP address of an interface? (Programmatically means using C of course :-) getsockname(2) is supposed to work but it doesn't since it returns 0.0.0.0 for INADDR_ANY. getpeername(2) works, so am I supposed to send a packet, do a getpeername(2) at the other side and get back the result in the payload? Till now I have got away with a system("/sbin/ifconfig -a | grep.... hack. Am I missing something? I surely am since the very notion of IP address of an interface is silly since it could be bridged,carped, trunked etc. But say, I have obtained 192.168.1.2 thro' DHCP and this is what I want to figure out. That is the only IP that interface has. How to achieve that?
I have never done it myself, but some quick documentation-digging hints it should be possible. You can use ioctl-"calls" to access this information. Please see netintro(4) and good luck. -Nick
