Feature Enhancement - option to disable DNS resolution of requestor IP

[GoogleCodeExporter]

It would be beneficial to add a configuration option to disable DNS resolution 
of the requestor IP.

This would be useful for performance tuning. Also for deployments where an 
intermediate reverse proxy/access gateway masks the real requestor IP (and 
x-forwarded-for isn't used)

What steps will reproduce the problem?
1. Attempt to access PWM from a host with an IP that the PWM server cannot 
resolve to a DNS name.
2. Observe a significant delay in establishing a session with (in our 
deployment this was between 10-15 seconds)

What is the expected output? What do you see instead?

1. No delay in establishing a session & no hostname resolution in the logging.

What version of the product are you using? On what operating system?
PWM 1.5.2, Windows 2003 Server, Java 1.6, Tomcat 6

Please provide any additional information below.

The DNS resolution is currently implemented in SessionFilter.java

// mark the user's hostname in the session bean
        ssBean.setSrcHostname(readUserHostname(req, pwmSession));

Original issue reported on code.google.com by oner...@gmail.com on 4 Feb 2011 at 10:04

[GoogleCodeExporter]

Sounds like a good idea to me.

Original comment by jrivard on 7 Feb 2011 at 5:22

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[GoogleCodeExporter]

Added in svn revision 106

Original comment by jrivard on 10 Feb 2011 at 2:30

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