Retrieve the IP address (DHCP)

Altera_Forum · ‎02-12-2007

Hi,

My application is similar to the examples found with the Nios II IDE (simple_socket_server...). It is based on microC/OS-II and NicheStack. Bassically, I send/receive UDP packets to/from the Cyclone FPGA.

In the network_utilitities.c file, I have the get_ip_addr routine that is called by InterNiche. When I run the application, I can see on the IDE console the IP address obtained with DHCP:

Acquired IP address via DHCP client for interface: et1

IP address : 192.168.68.197

Is there a function that I can call in my application to get this IP address value?

Thanks

Martin

Altera_Forum · ‎02-12-2007

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&#39;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

Altera_Forum · ‎02-13-2007

Hi Slacker,

Firstly, thanks for the fast answer.

I had success with the nets data structure.

# #############################

ip_addr my_ip_addr;

my_ip_addr = nets[0]->n_ipaddr;# #############################

For the netstatic data structure, it was undeclared.

Regards

Martin