Re: [cgi-devel] truncated post variable

[Darren G. <lis...@go...>]

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. :(