Retrieve the IP address (DHCP)

It's available in one of two existing data structures:

nets

netstatic

Just try debugging your code, and you'll see what I mean. Here's a quick sample, using netstatic:

/* Declare local ipaddr variable. */
ip_addr* ipaddr;
/* Assign ipaddr to the network interface's IP Address.
 * NOTE:  This code assumes that only a single network
 * interface exists
 */
ipaddr = &netstatic.n_ipaddr;

including the header, ipport.h, then gets you the ip4_addr[1-4] convenience macros... For example, the following should print your attained IP address:

printf("\nIP Address\n%d.%d.%d.%d\n",
        ip4_addr1(*ipaddr),
        ip4_addr2(*ipaddr),
        ip4_addr3(*ipaddr),
        ip4_addr4(*ipaddr));

NOTE: You could also do the same thing with nets, I believe, though I've not tried that.

Cheers,

- slacker