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Altera_Forum's avatar
Altera_Forum
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19 years ago

Retrieve the IP address (DHCP)

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

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    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
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    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