Re: [cgi-devel] truncated post variable

[<jc...@ol...>]

Hi Darren

I am facing a similar issue again. I wish I could build a small program
reproducing the error but somehow I am unable.

I must confess that I am lost in the maze of all those classes, functions...

I would like to get an idea of the post data that the library is getting
from the webserver before any parsing, so that I could know if the issue
is inside the CGI library or around the webserver
Any idea on how I could do that?

Thanks

JCR

> Hi JC,
>
> On 6 September 2011 00:18, <jc...@ol...> wrote:
>
>> Hello Darren,
>>
>> I am struggling with the following issue. On a linux box with nginx as
>> the
>> webserver
>>
>> on the client's side, I am making the following jquery call:
>>
>> function sign_up()
>> {
>>  $("#sign_up_feedback").html('').hide();
>>                $.post
>>                ( "/",
>>                                { task: 'sign_up',
>>                                  member_username:
>> $('#member_username').val(),
>>                                  member_password:
>> $('#member_password').val(),
>>                                  member_password_repeat:
>> $('#member_password_repeat').val(),
>>                                  member_first_name:
>> $('#member_first_name').val(),
>>                                  member_last_name:
>> $('#member_last_name').val(),
>>                                  member_phone: $('#member_phone').val(),
>>                                  member_email: $('#member_email').val(),
>>                                  member_corporation_id:
>> $('#member_corporation_id').val(),
>>                                  member_unit: $('#member_unit').val(),
>>                                  member_card_number:
>> $('#member_card_number').val(),
>>                                  member_card_expiration:
>> $('#member_card_expiration').val()
>>                                },
>>                                function(data)
>>                                {
>>                                  $("#sign_up_feedback").html(data).show();
>>                                }
>>  );
>> }
>>
>
> Look fine.
>
>
>> I have used similar functions, thousands of times but, this time,when I
>> read the post values server side
>> using
>> print_variables_(req.post, "POST");
>> with
>> template<typename Map>
>> void
>> print_variables_(Map& m, std::string title)
>> {
>>  std::ostringstream os;
>>  os << title <<  "\n";
>>  if (m.empty())
>>  {
>>    os << "NONE\n";
>>  }
>>  else
>>  {
>>    for(typename Map::const_iterator i = m.begin(); i != m.end(); ++i)
>>    {
>>      os << i->first << " = " << i->second << "\n";
>>    }
>>  }
>>  os << "\n";
>>  write_to_file("~/log_requests", os.str());
>> }
>>
>
> Ok.
>
>
>> member_card_number is truncated to member_card!  I looked at the http
>> headers and the nginx logs and member_card_number is not truncated.
>>
>
> That's odd. Is it just member_card_number that is truncated? Are all of
> the
> other parameters ok?
>
>
>> I am very puzzled here as this has never really happened to me.
>> Where in the source code of the CGI library could I see where the
>> parsing
>> of the http header is done?
>>
>
> These functions live in:
>
> http://svn.boost.org/svn/boost/sandbox/SOC/2007/cgi/trunk/boost/cgi/detail/extract_params.hpp
> http://svn.boost.org/svn/boost/sandbox/SOC/2007/cgi/trunk/boost/cgi/detail/url_decode.ipp
>
> There's also parse_url_encoded_form() in:
>
> http://svn.boost.org/svn/boost/sandbox/SOC/2007/cgi/trunk/boost/cgi/impl/form_parser.ipp
>
> which will get called for POST params.*
>
> Although I can't imagine how you're ending up seeing what you're seeing.
> Could you provide a minimal compilable file I can try?
>
> Cheers,
> Darren
>
> * wow I really need to commit this newer code, trunk isn't looking it's
> best
> I'm afraid. :(
>