Re: [libmicrohttpd] Can't log client address

[Evgeny Grin]

Hi Klemens,

Which MHD example has direct print of the "sa_data"?

'struct sockaddr' has the only accessible member, it is sa_family. You 
should check sa_family value to detect which protocol is used. Then, if 
it is IPv4, you must cast the pointer to 'struct sockaddr_in*' and 
operate members of sockaddr_in ('_in' is short for 'internet').
The member 'sin_addr' of 'sockaddr_in' gives you the address.

Try search the web for 'struct sockaddr' and 'struct sockaddr_in'. It is 
very basic.

--
Best Wishes,
Evgeny


On 24.08.2022 18:26, klemens wrote:
> try to log an incoming clients address, as suggested in
> example 2 of the tutorial:
>
> get_client_adr (void *cls, const struct sockaddr *addr, socklen_t addrlen)
> {
>      printf ("ADR>>%14.14x<<\n", addr->sa_data);
>      return MHD_YES;
> }
>
> main (int argc, char **argv)
> {
>      struct MHD_Daemon *daemon;
>
>      daemon = MHD_start_daemon (MHD_USE_THREAD_PER_CONNECTION,
>                                 PORT,
>                                 &get_client_adr,
>                                 NULL,
>                                 &answer_to_connection,
>                                 NULL,
>                                 MHD_OPTION_END);
>      if (NULL == daemon)
>        return 1;
>
>      (void) getchar ();
>      //answer_to_connection
>
>      MHD_stop_daemon (daemon);
>      return 0;
> }
>
>
> The program compiles on Debian6. But when I connect from the same
> server [192.168.0.95] the outcome is ADR>>000000ab00ac82<<, which
> does not make sense to me. Could anyone please help, what I'm
> doing wrong here. Thanks in advance.
>
> Klemens.

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