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From "J.Lance Wilkinson" <>
Subject [users@httpd] Handling load balancer's X-FORWARDED-FOR header: mod_proxy vs mod_remoteip and Apache 2.2.6
Date Tue, 19 Oct 2010 12:28:14 GMT
I've got Apache 2.2.6 in production and we're *trialling* a new load balancer 
which is able to create an X-FORWARDED-FOR header.

I wanted to keep things simple as possible, and it looked like mod_remoteip was 
the module I wanted to use for this purpose.   Simply using the mod_remoteip 
directive  "RemoteIPHeader X-Forwarded-For" should do what I wanted.

Then I found out how difficult it was to FIND the source for mod_remoteip.  The
website decribed it as a BASE module, but that is apparently for Apache 2.3 and 
up, since it's not evident in my 2.2.6 sources.

FINALLY (and this was a few weeks ago so I don't recall where) I found a source
file for mod_remoteip.c.

Then off to several conferences and returning to the office, I learn the trial 
load balancer is on its way out the door in the next day or so.

Trying to compile mod_remoteip.c, I get errors suggesting that there was 
apparently a change in the structure of modules between when this source was 
created and the APXS that I'm trying to use from Apache 2.2.6 --

# /dlt/sw/httpd-2.2.6-cosign/bin/apxs -c mod_remoteip.c
/dlt/sw/httpd-2.2.6-cosign/build/libtool --silent --mode=compile cc -prefer-pic 
-g -I/dlt/sw/httpd-2.2.6-cosign/include  -I/dlt/sw/httpd-2.2.6-cosign/include 
  -I/dlt/sw/httpd-2.2.6-cosign/include   -c -o mod_remoteip.lo mod_remoteip.c 
&& touch mod_remoteip.slo
"mod_remoteip.c", line 481: warning: function prototype parameters must have types
"mod_remoteip.c", line 481: warning: old-style declaration or incorrect type 
"mod_remoteip.c", line 481: cannot initialize function: AP_DECLARE_MODULE
"mod_remoteip.c", line 481: cannot recover from previous errors
cc: acomp failed for mod_remoteip.c
apxs:Error: Command failed with rc=65536

Short of modifying the source code to backfit it to 2.2.6 (which I am at a loss 
how to do), it's been suggested I look at mod_proxy, which is apparently part 
of the base for 2.2.6 (I am explicitly NOT loading this module right now). 
But I don't see the header "X-Forwarded-For" cited anywhere in the mod_proxy 
documentation, and I would expect that if this is a typical use of mod_proxy, 
there'd be SOMETHING like that noted there.

Thoughts on either the refitting for Apache 2.2.6 of mod_remoteip, using 
mod_proxy for the same purpose, or some other method of achieving this with the 
module's I've got to work with?

J.Lance Wilkinson ("Lance")		InterNet:
Systems Design Specialist - Lead	Phone: (814) 865-4870
Digital Library Technologies		FAX:   (814) 863-3560
E3 Paterno Library
Penn State University
University Park, PA 16802

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