Thread: get nic ip of localhost

Hi there,

before you ask, the search engine only accepts words with over two/three chars.

i've been looking for a way of finding the ip bound to the nic interface of the localhost (NOT 127.0.0.1).

i do not necessarily know the name of the machine either.

any suggestions or links?

TIA, rotis23

ok, this code gets the nics ip (in linux eth0) using the system hostname.

On linux it is important to have the network setup correctly or you will get localhost (/etc/hosts for example).

this will not work if dhcp is being used.

not all error checking has been included

Code:

struct hostent *hostinfo;
	char *host,**addrs;
	char myname[256];

	gethostname(myname, 255);
	host = myname;

	hostinfo = gethostbyname(host);
	if(!hostinfo)
	{
		fprintf(stderr, "cannot get info for host: %s\n", host);
		exit(1);
	}
	
	addrs = hostinfo -> h_addr_list;

	while(*addrs)
	{
		printf(" %s", inet_ntoa(*(struct in_addr *)*addrs));
		addrs++;
	}
	
	printf("\n");