Send host name string to DHCP server

[Klemen10]

I can't figure out why my router D-LINK DIR-451 all the time for my AVR device shows unknown host name in DHCP client list. I am working with uhttpd-avr project which use same DHCPD code like avr-uIP.

I add lines in send_discover and send_request to send option 12 Host name which is ''KCO''. I succed one one older router, where I could actually found KCO in my DCHP client list, but not on Dlink router all the time  shows unknown.

DHCP routine also didn't work on many routers until I didn't increase UIP_BUFSIZE from 400 to 600 bytes.

#define DHCP_OPTION_HOST_NAME    12
static u8_t * add_host_name(u8_t *optptr){
   
    *optptr++ = DHCP_OPTION_HOST_NAME;
    *optptr++ = 3;
    *optptr++ = 'K';
    *optptr++ = 'C';
    *optptr++ = 'O';
   
  return optptr;
}
send_discover(void)
{
  u8_t *end;
  struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;

  create_msg(m);

  end = add_msg_type(&m->options[4], DHCPDISCOVER);
  end = add_host_name(end);
  end = add_req_options(end);
  end = add_end(end);

  uip_send(uip_appdata, end - (u8_t *)uip_appdata);
}
static void
send_request(void)
{
  u8_t *end;
  struct dhcp_msg *m = (struct dhcp_msg *)uip_appdata;

  create_msg(m);
 
  end = add_msg_type(&m->options[4], DHCPREQUEST);
  end = add_server_id(end);
  end = add_req_ipaddr(end);
  end = add_host_name(end);
 // end = add_osem_ena_name(end);
  end = add_end(end);
  uip_send(uip_appdata, end - (u8_t *)uip_appdata);
}

Best regards,
Klemen

[Jonas Finnemann Jensen]

Hi Klemen,

It's been a couple of years since I played with uIP, but as far as I can remember I was never really successful with DHCP.

I configured static IP, and used mdns for hostname resolution... This way my device had a .local name on platforms with mdns support (linux/os x, don't know about windows).

However, mdns support requires multicast which isn't supported by uIP without a patch. I posted my mDNS implementation and uIP multicast patch to [uip-users] a couple of years ago. It's also available here: http://jonasfj.dk/downloads/uip-mdns.tar.gz

Anyways, that's is just another way to do name resolution on local network, in case you are interested.

--
Regards Jonas Finnemann Jensen.

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[Quentin Arce]

please open a bug on the project page.

also, please assign it to dianem...@gmail.com

Thank you

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