[Klone-users] Downloading files with Klone

[Stefano Barbato]

Hi Alvaro,

KLone by default embeds all web application files into the "kloned"  
executable, so it doesn't need to rely on the target system file  
system to provide web contents (html files, images, flash, etc.).

If you want to return a file got from the file system you can enable  
this functionality using the --enable_fs parameter of the configure  
script or, if that makes sense for your application, create a .kl1  
page that returns back a file using the standard file system syscalls:

---[ getmyfile.kl1 ]---
FILE *fp;
char buf[1024];

response_set_content_type(response, "text/plain");

fp = fopen(...);
while((len = fread(buf,... )) > 0)
     io_write(out, buf, len);
fclose(fp);
------------------------

If you want to serve through HTTP a directory tree (just like any  
usual web server) you have to append --enable_fs to the  
KLONE_CONF_ARGS variable in the top-level Makefile. Then add an URL  
alias to access system files from the web.

For example if you want to serve files from /var/www/ your  
configuration could be:
	
	dir_alias	/target		/var/www/

and users will be able to access files into /var/www using http://ip/target/file.ext 
  or http://ip/target/subdir/file.ext (again --enable_fs must be used  
during the configuration phase).

A more complete example (with virtual hosts, CGI and PHP can be found  
on wiki.koanlogic.com).

Answers:
- allow_root must be set to allow the execution of the daemon as the  
superuser "root" on unix systems; it is not used on Windows.
- to install a klone application copying the kloned.exe file is  
enough, everything is embedded into it.


bye,
stefano


On 28/nov/07, at 11:21, Alvaro Pereira wrote:

> Hi
>
> I have been trying now to download files (instead of uploading) from  
> the Klone web server. My targets are text files. So I have included  
> the following HTML code:
>
> <a href="file.txt">download file</a><br><br>
>
> The reason for this is that after upgrading our firmware it might be  
> necessary to have a look on installation logs which are usually txt  
> files. I have placed the above example file in several different  
> folders but Klone never finds it. Where is the web server's root?  
> Where is it actually looking for 'http://xx.xx.xx.xx:8080/file.txt'?  
> I understand this is defined in the configuration file kloned.conf.
>
> So I have the following attributes:
> server_list    app_http
> allow_root yes
> app_http
> {
>     type            http
>
>     addr.type       IPv4
>     addr.port       8080
>     dir_root        /www
> }
>
> What happens if 'allow_root' is deleted? It is also my understanding  
> that the directory './webapp/www' is my web server root. This is  
> where I placed all my html and Klone files, as well 'file.txt'. What  
> can I do in order to be able to download text files using hyperlinks?
>
>
> I have also another question on the same subject:
>
> When I copy and install KLone on my embedded system (after build) I  
> normally copy the .wc and kloned.exe files. I suppose the html and  
> kl1 pages are embedded into the Klone executable. Then I start the  
> service again.
>
> Is it really necessary to copy the contents of the /webapp folder as  
> well? My guess is that copying /etc and /www is not mandatory. Is  
> this right?
>
> But even so, how can I sort the downloading problem? I have tried  
> placing file.txt in the folder where kloned.exe is located but it  
> did not work either.
>
> Regards,
> Alvaro
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