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Posted to modules-dev@httpd.apache.org by karim Bendadda <ka...@gmail.com> on 2008/01/13 20:58:56 UTC
[Apache Module] Request External Redirection
Hi everybody,
I'm writing a module (MyModule_mod.c) wich has an *HTTP request* as
input . I want to add an information to the request (an integer) and
redirect it to an *external *server ...Did you know any method for doing
this?
*
HTTP request*----->MyModule_mod.so (add an information into the
request)---->*New HTTP request*----->External Server
Thank you very much!
--
Karim
Re: [Apache Module] Request External Redirection
Posted by Joe Lewis <jo...@joe-lewis.com>.
Dr. Peter Poeml wrote:
> On Mon, Jan 14, 2008 at 03:50:25PM +0100, karim Bendadda wrote:
>
>> Thanks for your answer! But I don't understand the second way to implement
>> it?? "it can respond with a Location: header and a status of 302."??
>>
>> On 1/14/08, Joe Lewis <jo...@joe-lewis.com> wrote:
>>
>>> karim Bendadda wrote:
>>>
>>>> I'm writing a module (MyModule_mod.c) wich has an *HTTP
>>>>
>>> request* as
>>>
>>>> input . I want to add an information to the request (an integer) and
>>>> redirect it to an *external *server ...Did you know any method for doing
>>>> this?
>>>>
>>>>
>>>>
>>> There are two paths. The server can PROXY to the external server (e.g.
>>> grab the result from the external server and then relay that to the
>>> client) or it can respond with a Location: header and a status of 302.
>>> Figure out which you wanted to do, and if you struggle to implement it,
>>> let us know.
>>>
>
> In your handler, you would do something like this to implement the latter:
>
> /* set a "Location:" header and 302 redirect. */
>
> /* assemble the url by appending the filename to a baseurl */
> uri = apr_pstrcat(r->pool, baseurl, filename, NULL);
>
> apr_table_setn(r->headers_out, "Location", uri);
>
> return HTTP_MOVED_TEMPORARILY;
>
> Peter
>
Exactly! What it does is forces the web client to go to the external
server and request the resource/URI rather than the web server getting
it for the web client. It's a standard in the HTTP protocols that 302
response codes work in a specific fashion.
Joe
--
Joseph Lewis <http://sharktooth.org/>
"Divide the fire, and you will sooner put it out." - Publius Syrus
Re: [Apache Module] Request External Redirection
Posted by karim Bendadda <ka...@gmail.com>.
It's the request header, In fact I receive an http request with a
certificate whish I can read by: *
certificate *= *apr_table_get(r->headers_in, sslClientCertificat);
*Now I want to redirect the SAME request to another server by preserving
the request (and the certificate into it)
when I tried this:
*
apr_table_setn(r->headers_out, (const char*)"Location",url);
ap_log_rerror(APLOG_MARK,APLOG_NOTICE,0,r,"The certificate
%s",apr_table_get(r->headers_out, sslClientCertificat));
return HTTP_MOVED_TEMPORARILY**;
*
I have the log: *The certificate= null;*
*
*How Can I redirect ALL the request??
Thks.
On Jan 15, 2008 2:02 PM, Eric Covener <co...@gmail.com> wrote:
> On Jan 15, 2008 5:17 AM, karim Bendadda <ka...@gmail.com> wrote:
> > I'm sorry but the redirection doesn't work (I'm so sad...).. It
> redirects
> > just a new http request but the Informations that I need on the incoming
> > request is not beeing requested... I think I need a mod_proxy_hook...
>
> What information isn't retained? Something in apache? A request header?
>
>
>
> --
> Eric Covener
> covener@gmail.com
>
--
Karim
Re: [Apache Module] Request External Redirection
Posted by Eric Covener <co...@gmail.com>.
On Jan 15, 2008 5:17 AM, karim Bendadda <ka...@gmail.com> wrote:
> I'm sorry but the redirection doesn't work (I'm so sad...).. It redirects
> just a new http request but the Informations that I need on the incoming
> request is not beeing requested... I think I need a mod_proxy_hook...
What information isn't retained? Something in apache? A request header?
--
Eric Covener
covener@gmail.com
Re: [Apache Module] Request External Redirection
Posted by karim Bendadda <ka...@gmail.com>.
I'm sorry but the redirection doesn't work (I'm so sad...).. It redirects
just a new http request but the Informations that I need on the incoming
request is not beeing requested... I think I need a mod_proxy_hook...
Thank you for your help
On Jan 14, 2008 7:40 PM, Joe Lewis <jo...@joe-lewis.com> wrote:
> karim Bendadda wrote:
> > I did that , I have a redirection to the new url but it seems that it's
> just
> > a redirection , the HTTP request doesn't get in the new URl: there is my
> > code:
> >
>
> The only two options again are to proxy to the external server, or
> redirect the client to the external server.
>
> If you don't want a redirection at the web browser, you will have to
> proxy the request. I do not know about setting up a hook into mod_proxy
> to have a request proxied - it's something I've never done, but there
> should be many people who have done it. Anyone with any short examples?
>
> Joe
> --
> Joseph Lewis <http://sharktooth.org/>
> "Divide the fire, and you will sooner put it out." - Publius Syrus
>
--
Karim
Re: [Apache Module] Request External Redirection
Posted by Joe Lewis <jo...@joe-lewis.com>.
karim Bendadda wrote:
> How can I see if my module really redirect the request?? (by the
> ap_log_error for example)
> Thank you very much for your precisous help!
>
You should see the URL change in the browser to the new location.
--
Joseph Lewis <http://sharktooth.org/>
"Divide the fire, and you will sooner put it out." - Publius Syrus
Re: [Apache Module] Request External Redirection
Posted by karim Bendadda <ka...@gmail.com>.
How can I see if my module really redirect the request?? (by the
ap_log_error for example)
Thank you very much for your precisous help!
On 1/14/08, Joe Lewis <jo...@joe-lewis.com> wrote:
>
> karim Bendadda wrote:
> > I did that , I have a redirection to the new url but it seems that it's
> just
> > a redirection , the HTTP request doesn't get in the new URl: there is my
> > code:
> >
>
> The only two options again are to proxy to the external server, or
> redirect the client to the external server.
>
> If you don't want a redirection at the web browser, you will have to
> proxy the request. I do not know about setting up a hook into mod_proxy
> to have a request proxied - it's something I've never done, but there
> should be many people who have done it. Anyone with any short examples?
>
> Joe
> --
> Joseph Lewis <http://sharktooth.org/>
> "Divide the fire, and you will sooner put it out." - Publius Syrus
>
--
Karim
Re: [Apache Module] Request External Redirection
Posted by Joe Lewis <jo...@joe-lewis.com>.
karim Bendadda wrote:
> I did that , I have a redirection to the new url but it seems that it's just
> a redirection , the HTTP request doesn't get in the new URl: there is my
> code:
>
The only two options again are to proxy to the external server, or
redirect the client to the external server.
If you don't want a redirection at the web browser, you will have to
proxy the request. I do not know about setting up a hook into mod_proxy
to have a request proxied - it's something I've never done, but there
should be many people who have done it. Anyone with any short examples?
Joe
--
Joseph Lewis <http://sharktooth.org/>
"Divide the fire, and you will sooner put it out." - Publius Syrus
Re: [Apache Module] Request External Redirection
Posted by karim Bendadda <ka...@gmail.com>.
I did that , I have a redirection to the new url but it seems that it's just
a redirection , the HTTP request doesn't get in the new URl: there is my
code:
static int my_module_handler (request_rec *r) {
apr_table_setn( r->headers_out, "Location","http://10.112.3.20/test");
return HTTP_MOVED_TEMPORARILY;
}
module AP_MODULE_DECLARE_DATA my_module_module = {
STANDARD20_MODULE_STUFF,
NULL,
NULL,
my_module_config,
NULL,
my_module_cmds,
my_module_hooks
};
Really sorry for the * *inconvenience ....
On 1/14/08, Joe Lewis <jo...@joe-lewis.com> wrote:
>
> karim Bendadda wrote:
> > Sorry but I'm a beginer on developping Apache modules...Thank you for
> your
> > patience...
> >
> > I dont't understand this:
> >
> >
> >> /* set a "Location:" header and 302 redirect. */
> >>
> >
> > Does'it mean to make this??:
> >
>
> No, that is just a C comment.
>
> > <Location /my_module>
> > Redirect /my_module http://10.112.3.20/test
> > </Location>
> >
>
> This is a pre-build "hard coded" redirection module that does something
> very similar to :
>
> > static int my_module_handler (request_rec *r){
> >
> > /* assemble the url by appending the filename to a baseurl */
> >
> > uri = apr_pstrcat(r->pool, "http://10.112.3.20/test", "my_module",
> > NULL);/*????*/
> >
> > apr_table_setn(r->headers_out, "my_module", uri);
> >
> > return HTTP_MOVED_TEMPORARILY;
> > }
> >
> >
> >
>
> However, you have two things that are wrong in your code. The resulting
> uri would be "http://10.112.3.20/testmy_module" because the
> apr_pstrcat() function tacks the two strings together. If you already
> know the full URL, you can skip the uri= line and set the headers_out.
>
> Which brings up the other issue. The apr_table_setn must be setting a
> "Location" header in order to meet the redirection standard. Yours is
> setting "my_module". Replace "my_module" with "Location", and then
> whatever is in the uri parameter is going to the web browser as the
> location header, and it should contact the new server/resource.
>
> Joe
> --
> Joseph Lewis <http://sharktooth.org/>
> "Divide the fire, and you will sooner put it out." - Publius Syrus
>
--
Karim
Re: [Apache Module] Request External Redirection
Posted by Joe Lewis <jo...@joe-lewis.com>.
karim Bendadda wrote:
> Sorry but I'm a beginer on developping Apache modules...Thank you for your
> patience...
>
> I dont't understand this:
>
>
>> /* set a "Location:" header and 302 redirect. */
>>
>
> Does'it mean to make this??:
>
No, that is just a C comment.
> <Location /my_module>
> Redirect /my_module http://10.112.3.20/test
> </Location>
>
This is a pre-build "hard coded" redirection module that does something
very similar to :
> static int my_module_handler (request_rec *r){
>
> /* assemble the url by appending the filename to a baseurl */
>
> uri = apr_pstrcat(r->pool, "http://10.112.3.20/test", "my_module",
> NULL);/*????*/
>
> apr_table_setn(r->headers_out, "my_module", uri);
>
> return HTTP_MOVED_TEMPORARILY;
> }
>
>
>
However, you have two things that are wrong in your code. The resulting
uri would be "http://10.112.3.20/testmy_module" because the
apr_pstrcat() function tacks the two strings together. If you already
know the full URL, you can skip the uri= line and set the headers_out.
Which brings up the other issue. The apr_table_setn must be setting a
"Location" header in order to meet the redirection standard. Yours is
setting "my_module". Replace "my_module" with "Location", and then
whatever is in the uri parameter is going to the web browser as the
location header, and it should contact the new server/resource.
Joe
--
Joseph Lewis <http://sharktooth.org/>
"Divide the fire, and you will sooner put it out." - Publius Syrus
Re: [Apache Module] Request External Redirection
Posted by karim Bendadda <ka...@gmail.com>.
Sorry but I'm a beginer on developping Apache modules...Thank you for your
patience...
I dont't understand this:
> /* set a "Location:" header and 302 redirect. */
Does'it mean to make this??:
<Location /my_module>
Redirect /my_module http://10.112.3.20/test
</Location>
Then I tried this:
static int my_module_handler (request_rec *r){
/* assemble the url by appending the filename to a baseurl */
uri = apr_pstrcat(r->pool, "http://10.112.3.20/test", "my_module",
NULL);/*????*/
apr_table_setn(r->headers_out, "my_module", uri);
return HTTP_MOVED_TEMPORARILY;
}
Am I wrrong?? Is that means my request is redirected to
http://10.112.3.20/test??
On 1/14/08, Joe Lewis <jo...@joe-lewis.com> wrote:
>
> karim Bendadda wrote:
> > Thank you for your help!
> >
> > How can I call the Redirect directive into the module??, In fact in the
> > module I have a function that make an LDAP connection I want to do
> something
> > like that:
> >
> > request_rec* my_request; //The request with new information
> >
> > if(my_function(user_is_defined_in_ldap)==true)
> >
> > Redirect my_request new_Url
> >
> > else
> >
> > Do_nothing
> >
>
>
> Do_nothing should be "return DECLINED" in the handler. Redirect
> my_request new_URL should be almost verbatim the code that the Doc
> (Peter Poeml) included. Let me just snip down through to his example to
> make it a little more obvious.
>
>
> >> In your handler, you would do something like this to implement the
> latter:
> >>
> >> /* set a "Location:" header and 302 redirect. */
> >>
> >> /* assemble the url by appending the filename to a baseurl */
> >> uri = apr_pstrcat(r->pool, baseurl, filename, NULL);
> >>
> >> apr_table_setn(r->headers_out, "Location", uri);
> >>
> >> return HTTP_MOVED_TEMPORARILY;
>
>
> And there is the "how to". Recall, though, that this kind of thing
> shouldn't be in an input filter, but a handler. (It may, in theory, be
> workable in a filter, but a filter is supposed to alter input not handle
> requests, and a handler is supposed to give the response of the 302 or
> data or decline to handle it.)
>
> Joe
> --
> Joseph Lewis <http://sharktooth.org/>
> "Divide the fire, and you will sooner put it out." - Publius Syrus
>
--
Karim
Re: [Apache Module] Request External Redirection
Posted by Joe Lewis <jo...@joe-lewis.com>.
karim Bendadda wrote:
> Thank you for your help!
>
> How can I call the Redirect directive into the module??, In fact in the
> module I have a function that make an LDAP connection I want to do something
> like that:
>
> request_rec* my_request; //The request with new information
>
> if(my_function(user_is_defined_in_ldap)==true)
>
> Redirect my_request new_Url
>
> else
>
> Do_nothing
>
Do_nothing should be "return DECLINED" in the handler. Redirect
my_request new_URL should be almost verbatim the code that the Doc
(Peter Poeml) included. Let me just snip down through to his example to
make it a little more obvious.
>> In your handler, you would do something like this to implement the latter:
>>
>> /* set a "Location:" header and 302 redirect. */
>>
>> /* assemble the url by appending the filename to a baseurl */
>> uri = apr_pstrcat(r->pool, baseurl, filename, NULL);
>>
>> apr_table_setn(r->headers_out, "Location", uri);
>>
>> return HTTP_MOVED_TEMPORARILY;
And there is the "how to". Recall, though, that this kind of thing
shouldn't be in an input filter, but a handler. (It may, in theory, be
workable in a filter, but a filter is supposed to alter input not handle
requests, and a handler is supposed to give the response of the 302 or
data or decline to handle it.)
Joe
--
Joseph Lewis <http://sharktooth.org/>
"Divide the fire, and you will sooner put it out." - Publius Syrus
Re: [Apache Module] Request External Redirection
Posted by karim Bendadda <ka...@gmail.com>.
Thank you for your help!
How can I call the Redirect directive into the module??, In fact in the
module I have a function that make an LDAP connection I want to do something
like that:
request_rec* my_request; //The request with new information
if(my_function(user_is_defined_in_ldap)==true)
Redirect my_request new_Url
else
Do_nothing
On 1/14/08, Dr. Peter Poeml <po...@suse.de> wrote:
>
> On Mon, Jan 14, 2008 at 03:50:25PM +0100, karim Bendadda wrote:
> > Thanks for your answer! But I don't understand the second way to
> implement
> > it?? "it can respond with a Location: header and a status of 302."??
> >
> > On 1/14/08, Joe Lewis <jo...@joe-lewis.com> wrote:
> > >
> > > karim Bendadda wrote:
> > > > I'm writing a module (MyModule_mod.c) wich has an *HTTP
> > > request* as
> > > > input . I want to add an information to the request (an integer) and
> > > > redirect it to an *external *server ...Did you know any method for
> doing
> > > > this?
> > > >
> > > >
> > >
> > > There are two paths. The server can PROXY to the external server (e.g
> .
> > > grab the result from the external server and then relay that to the
> > > client) or it can respond with a Location: header and a status of 302.
> > > Figure out which you wanted to do, and if you struggle to implement
> it,
> > > let us know.
>
> In your handler, you would do something like this to implement the latter:
>
> /* set a "Location:" header and 302 redirect. */
>
> /* assemble the url by appending the filename to a baseurl */
> uri = apr_pstrcat(r->pool, baseurl, filename, NULL);
>
> apr_table_setn(r->headers_out, "Location", uri);
>
> return HTTP_MOVED_TEMPORARILY;
>
> Peter
> --
> "WARNING: This bug is visible to non-employees. Please be respectful!"
>
> SUSE LINUX Products GmbH
> Research & Development
>
>
--
Karim
Re: [Apache Module] Request External Redirection
Posted by "Dr. Peter Poeml" <po...@suse.de>.
On Mon, Jan 14, 2008 at 03:50:25PM +0100, karim Bendadda wrote:
> Thanks for your answer! But I don't understand the second way to implement
> it?? "it can respond with a Location: header and a status of 302."??
>
> On 1/14/08, Joe Lewis <jo...@joe-lewis.com> wrote:
> >
> > karim Bendadda wrote:
> > > I'm writing a module (MyModule_mod.c) wich has an *HTTP
> > request* as
> > > input . I want to add an information to the request (an integer) and
> > > redirect it to an *external *server ...Did you know any method for doing
> > > this?
> > >
> > >
> >
> > There are two paths. The server can PROXY to the external server (e.g.
> > grab the result from the external server and then relay that to the
> > client) or it can respond with a Location: header and a status of 302.
> > Figure out which you wanted to do, and if you struggle to implement it,
> > let us know.
In your handler, you would do something like this to implement the latter:
/* set a "Location:" header and 302 redirect. */
/* assemble the url by appending the filename to a baseurl */
uri = apr_pstrcat(r->pool, baseurl, filename, NULL);
apr_table_setn(r->headers_out, "Location", uri);
return HTTP_MOVED_TEMPORARILY;
Peter
--
"WARNING: This bug is visible to non-employees. Please be respectful!"
SUSE LINUX Products GmbH
Research & Development
Re: [Apache Module] Request External Redirection
Posted by karim Bendadda <ka...@gmail.com>.
Thanks for your answer! But I don't understand the second way to implement
it?? "it can respond with a Location: header and a status of 302."??
On 1/14/08, Joe Lewis <jo...@joe-lewis.com> wrote:
>
> karim Bendadda wrote:
> > I'm writing a module (MyModule_mod.c) wich has an *HTTP
> request* as
> > input . I want to add an information to the request (an integer) and
> > redirect it to an *external *server ...Did you know any method for doing
> > this?
> >
> >
>
> There are two paths. The server can PROXY to the external server (e.g.
> grab the result from the external server and then relay that to the
> client) or it can respond with a Location: header and a status of 302.
> Figure out which you wanted to do, and if you struggle to implement it,
> let us know.
>
> Joe
> --
> Joseph Lewis <http://sharktooth.org/>
> "Divide the fire, and you will sooner put it out." - Publius Syrus
>
--
Karim
Re: [Apache Module] Request External Redirection
Posted by Joe Lewis <jo...@joe-lewis.com>.
karim Bendadda wrote:
> I'm writing a module (MyModule_mod.c) wich has an *HTTP request* as
> input . I want to add an information to the request (an integer) and
> redirect it to an *external *server ...Did you know any method for doing
> this?
>
>
There are two paths. The server can PROXY to the external server (e.g.
grab the result from the external server and then relay that to the
client) or it can respond with a Location: header and a status of 302.
Figure out which you wanted to do, and if you struggle to implement it,
let us know.
Joe
--
Joseph Lewis <http://sharktooth.org/>
"Divide the fire, and you will sooner put it out." - Publius Syrus