From 61b5180799f032b4e3ba93445a183998d5cf5796 Mon Sep 17 00:00:00 2001
From: Stephen Soltesz <soltesz@cs.princeton.edu>
Date: Tue, 22 Sep 2009 02:58:53 +0000
Subject: [PATCH] try to add the reverse-lookup hostname as well to make the
 rtdemo work out-of-the-box.

---
 plcrt.init | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/plcrt.init b/plcrt.init
index bd66b59..bd6db4c 100644
--- a/plcrt.init
+++ b/plcrt.init
@@ -17,6 +17,12 @@ local_config=/etc/planetlab/configs/site.xml
 
 PLCRTPATH=/usr/share/plcrt
 
+function gethostbyaddr ()
+{
+    python -c 'import socket; import sys; print socket.gethostbyaddr(sys.argv[1])[0]' $1 2>/dev/null
+}
+
+
 # Be verbose
 set -x
 
@@ -228,6 +234,11 @@ check_rt_sendmail ()
 		if ! grep "$PLC_RT_HOST" /etc/mail/local-host-names ; then
 			# edit /etc/mail/local-host-names
 			echo "$PLC_RT_HOST" >> /etc/mail/local-host-names
+			IP=$( gethostbyname $PLC_RT_HOST )
+			REVHOST=$( gethostbyaddr $IP )
+			if [ -n "$REVHOST" ] ; then 
+			    echo "$REVHOST" >> /etc/mail/local-host-names
+			fi
 		fi
 		m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
 		service sendmail restart
-- 
2.43.0