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Re: [libmicrohttpd] Question regarding HTTP basic auth example

From: Martin Velek
Subject: Re: [libmicrohttpd] Question regarding HTTP basic auth example
Date: Mon, 17 Feb 2014 15:23:11 +0100


because this email is not an answer to Your question, please consider
it like a hint, not advice.

You are not obligated to return only MHD_YES in "if (NULL ==
*con_cls)". You may also return MHD_NO or even process the connection.
According to my stack trace,
Thread [12] 4230 [core: 1] (Suspended : Breakpoint)
    AccessHandlerCallback() at http_server.c:303 0x43a281
    call_connection_handler() at connection.c:1,303 0x43042a
    MHD_connection_handle_idle() at connection.c:2,207 0x431baa
    MHD_run_from_select() at daemon.c:1,814 0x43498c
    MHD_select() at daemon.c:1,909 0x434e15
    MHD_select_thread() at daemon.c:2,417 0x434e7e
    rtos_mhd_thread_wrapper() at platform.h:168 0x4327a6
    ITaskStartup() at rtos_pthread.c:228 0x40895c
    start_thread() at pthread_create.c:308 0x7ffff76c0e9a
    clone() at clone.S:112 0x7ffff70f83fd
    <...more frames...>
the connection_handler is called after
MHD_CONNECTION_HEADERS_PROCESSED (the first call). At this time, the
*upload_data_size is equal to zero even if the TCP packet contains
data following (behind) the end mark of HTTP headers.

I am using this checking in my url handler:
// New connection?
 if (NULL == *con_cls)
        // Data should never be greater than zero because of first call.
        assert((*upload_data_size) == 0);

        // Default behavior for authentication is OK.
        ret = MHD_YES;

        // get username and password
        user = MHD_basic_auth_get_username_password(connection, &pass);

        // check if it is valid
        if (false == credentials_check)
            ret = generate_unauthorized_response(connection,
                    (void *)authentification_failed_page_,
            // Return value.
            return ret;
          *con_cls = Something;


// already authenticated ....

On Mon, Feb 17, 2014 at 2:13 PM, Sebastian Hammerl
<address@hidden> wrote:
> Hi,
> Am 17.02.2014 13:58, schrieb Christian Grothoff:
>> if (*upload_data_size > 0)
>> {
>>    *upload_data_size = 0; // consume
>>    return MHD_YES;
>> }
> that did it!
> Thank you very much,
>     Sebastian

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