Re: [lwip-users] A question about dns_init

[Hervé DANIEL]

Hi,
I check args they are correct.
If I put breaks points at each "return ERR_VAL"
the program break there:

static void
do_dns_found(const char *name, struct ip_addr *ipaddr, void *arg)
{
  struct dns_api_msg *msg = (struct dns_api_msg*)arg;

  LWIP_ASSERT("DNS response for wrong host name", strcmp(msg->name, name)  
== 0);

  if (ipaddr == NULL) {
    /* timeout or memory error */
    *msg->err = ERR_VAL;                                             
//<<<<<<<<<  HERE
  } else {
    /* address was resolved */
    *msg->err = ERR_OK;
    *msg->addr = *ipaddr;
  }
  /* wake up the application task waiting in netconn_gethostbyname */
  sys_sem_signal(msg->sem);
}

In the trace we can see "dns_check_entry: "www.google.com": timeout"

--
herve.



Le Mon, 17 Oct 2011 10:22:28 +0200, Simon Goldschmidt <address@hidden> a  
écrit:

> Having a quick look at dns.c (from v1.3.2), ERR_VAL is return if you  
> pass invalid arguments to dns_gethostbyname:
>
> if ((dns_pcb == NULL) || (addr == NULL) ||
>     (!hostname) || (!hostname[0]) ||
>     (strlen(hostname) >= DNS_MAX_NAME_LENGTH)) {
>   return ERR_VAL;
> }
>
> This means wither DNS is not initialized, you did not pass an 'addr'  
> pointer or you did not pass a correct 'hostname' (NULL or empty or too  
> long).
>
> Simon
>
>
>
> "Hervé DANIEL" <address@hidden> wrote:
> > Hi,
> >
> > netconn_gethostbyname returns the error.
> >
> > I found that I call two time dns_init (alwready call with tcpip_init
> > before)
> > But it change nothing.
> >
> > --
> > herve.
> >
> >
> > Le Sat, 15 Oct 2011 21:06:23 +0200, Kieran Mansley <address@hidden> a
> > écrit:
> >
> > >
> > > On 14 Oct 2011, at 17:39, Hervé DANIEL wrote:
> > >
> > >>
> > >> Hi,
> > >>
> > >> I'm tring to use   netconn_gethostbyname  (LWIP1.3.2)
> > >>
> > >> I've made a basic program with this code
> > >>
> > >>  dns_init();
> > >>  err=netconn_gethostbyname("www.google.com", &Addr);
> > >>
> > >> and i get the adress. (what a beautifull world)
> > >>
> > >> then i copy paste to my real program (it s a web server) and i get an
> > >> error
> > >> err =  -8  : ERR_VAL
> > >
> > > What function is it that returns the error?
> > >
> > > Kieran
> > > _______________________________________________
> > > lwip-users mailing list
> > > address@hidden
> > > https://lists.nongnu.org/mailman/listinfo/lwip-users
> >
> > _______________________________________________
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