Ant: Re: Ant: [Php-java-bridge-users] PhpJavaServlet using tunneling instead of CGI?

[Jost B. <jos...@ya...>]

Hi Kevin,


> I've configured the mod_jk differently

I think we can ignore mod_jk for this discussion,
because it is not essential for the PHP/Java Bridge. 
-- Unless you forward everything to tomcat, which
would render Apache, PHP and PHP/Java Bridge useless.


> Regardless of that, I'm confused about the request
> method.  The
> request is a Get request, as defined by the browser
> makeing the
> request.  Where and why would it be translated to a
> Put?

It's an internal operation of the bridge. Essentially
you have two pools, the HTTP/PHP pool (usually at :80)
and the Tomcat (JavaThread) pool (usually at tcp port
:8080). For each php instance request with java code
in it, the bridge allocates an instance from each
pool. The instances communicate using a cps style
(they pass each other's continuation). 

To make this work, the two pools must be accessible to
the bridge, of course.  "Accessible" means that they
must listen on TCP ports. (The bridge also supports
unix domain sockets for the local backend, but this
requires that you inject a JNI library called
"natcJavaBridge.so" into the java VM).


> First:  I don't want to run apache on port 80,
> surely this port isn't hardcoded anywhere?

No, of course not.


> Second:  What do you mean that "java cannot drop
> privileges"?  

Privilege dropping means that one part of the server
runs with suid rights while other parts run with lower
privileges. POSIX requires that, when a thread changes
its uid, all other threads change their id, too. After
that tomcat cannot accept connections on the
privileged port 80 anymore.


> quite possible to configure Tomcat to answer
> requests on port 80,

If one wants to expose /etc/passwd and /etc/shadow to
everyone on the internet, yes...


> Apache is running on port 8080, though, and it leads
> me to the problem I'm having.

So the apache pool listens on 8080 (I thought that's
the tomcat pool).  On which TCP port does tomcat
listen? 


Regards,
Jost Boekemeier



	

	
		
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