Finding the Apache httpd IP address when AJP is used

[Paul Klinkenberg]

Hi Tomcat users!

I have been working on an update for a Tomcat valve called mod_cfml. The 
project aims to provide automatic web context creation in Tomcat, when coming 
from a frontend webserver.
The live code base can be found at https://github.com/utdream/mod_cfml 
<https://github.com/utdream/mod_cfml>

One of the features I wanted to add, is adding an IP restriction in the valve 
(see github 
<https://github.com/paulklinkenberg/mod_cfml/commit/dab058b7f38f98a6e7f076323e3d23be476e6de6>).
 
While testing, I noticed that AJP works very well: it hides the IP address of 
the caller, which is the front-end Apache webserver, and instead returns the IP 
of the remote client / the client who called the frontend webserver.
I have been digging around quite a lot, but have not been able to find the 
Apache httpd IP address :-(

My question is hopefully simple to answer: can I retrieve the IP address which 
called the AJP connector, from within the valve?

My server.xml is:

<Server port="8005" shutdown="SHUTDOWN">
  <Listener className="org.apache.catalina.startup.VersionLoggerListener" />
  <Listener className="org.apache.catalina.core.AprLifecycleListener" 
SSLEngine="on" />
  <Listener 
className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
  <Listener 
className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
  <Listener 
className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
  <GlobalNamingResources>
    <Resource name="UserDatabase" auth="Container"
              type="org.apache.catalina.UserDatabase"
              description="User database that can be updated and saved"
              factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
              pathname="conf/tomcat-users.xml" />
  </GlobalNamingResources>
  <Service name="Catalina">
    <Connector port="8080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />
    <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
    <Engine name="Catalina" defaultHost="localhost">
      <Realm className="org.apache.catalina.realm.LockOutRealm">
        <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
               resourceName="UserDatabase"/>
      </Realm>
      <Host name="localhost" appBase="webapps" unpackWARs="true" 
autoDeploy="true">
            <Valve
                className="mod_cfml.core"
                loggingEnabled="true"
                waitForContext="10"
                maxContexts="9999"
                timeBetweenContexts="0"
                scanClassPaths="false"
                allowedIPs="127.0.0.1,192.168.1.52" />
      </Host>
    </Engine>
  </Service>
</Server>

Thanks in advance for your time!

Kind regards,

Paul Klinkenberg
The Netherlands

p.s. I asked this question, in other wording, on SackOverflow.com 
<http://sackoverflow.com/> as well. I hope I have better luck here ;-)
http://stackoverflow.com/questions/29858030/where-can-i-find-the-apache-httpd-server-ip-from-within-a-tomcat-valve-when-ajp
 
<http://stackoverflow.com/questions/29858030/where-can-i-find-the-apache-httpd-server-ip-from-within-a-tomcat-valve-when-ajp>