saslauthd SASL_IPREMOTEPORT -> PAM_RHOST

[Lorenzo Catucci]

Since I've seen some other people requesting the functionality [*], I think
someone could like getting a courtesy copy of a bugzilla entry I've just
filed on bugzilla.cyrusimap.org:

http://bugzilla.cyrusimap.org/bugzilla3/show_bug.cgi?id=3468

I'm attaching both a 2.1.23 and a 2.1.24 version of the patch, since there 
is a merge conflict between the former and 2.1.24 sources.

I'd be grateful about any comment - review - test which could help with 
upstreaming my patch.

Please keep in mind that I'm unable to test on a solaris box; therefore,
the ipc_doors changes should be treated as VERY SUSPECT; still, I think they 
make sense, and would be twice as grateful to any solaris tester...

Thank you very much, yours

	lorenzo

[*] In particular, a google search lead to the following pages:

http://lists.andrew.cmu.edu/pipermail/cyrus-sasl/2011-March/002218.html
      "saslauthd/PAM IP logging on failure"   - 2011-03-26

https://bugzilla.redhat.com/show_bug.cgi?id=683797
      "saslauthd using pam does not log rhost (remote host) IP/hostname
           or requested login in /var/log/secure" - 2011-03-10

http://lists.andrew.cmu.edu/pipermail/cyrus-sasl/2010-July/002108.html
      "PAM authentication - Remote host"      - 2010-07-13

http://lists.andrew.cmu.edu/pipermail/cyrus-sasl/2010-May/002085.html
      "remote client ip"                      - 2010-05-24

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