#!/bin/ksh


set -- `getopt s:g:h:t:l:S:u $*`
# check result of parsing       
if [ $? != 0 ]                  
then                            
  exit 1                  
fi                              
while [ $1 != -- ]              
do                              
  case $1 in
   -h) 
       hostNmDt=$2
       shift;;

   -S) 
       stat=$2
       shift;;

   -g) 
       grp=$2
       shift;;
  esac
  shift
done

RULEDIR=/usr/src/linux/net/ipv4/rule
IPVSADM=/usr/sbin/ipvsadm 
INSMOD=/sbin/insmod 
RMMOD=/sbin/rmmod 
DTOX=/home/cprakash/progs/dtox
VIRTUAL_SERV=128.198.192.184

makeNewModAndIns()
{
 set -x
 #echo "$*"
 cd $RULEDIR
 echo ":%s/{\"$1\".*}/{\"$1\", $2}/g"

 #edit rule file
vi -n rule_template.c << EOF 2>&1 1> err.out



:%s/{\"$1\".*}/{\"$1\", $2}/g
:wq
EOF

rm -f ip_cs_curr_rule.o
make ip_cs_curr_rule.o

if [ -e ip_cs_curr_rule.o ]
then 
  $RMMOD ip_cs_curr_rule
  $INSMOD ip_cs_curr_rule.o
else
  exit 1
fi
}

if [ $stat = 1 ]              
then
#up alert
echo "up alert"

  hostNmHx=`$DTOX $hostNmDt`

  makeNewModAndIns $grp $hostNmHx

  #compile and insert of new module was a success.
  #Now, add this server to the lcs server group
  $IPVSADM -a -t $VIRTUAL_SERV:www -r $hostNmDt -m

else
#down alert
 set -x
 echo "down alert"

 #remove the host from the virtual service setup
 $IPVSADM -d -t $VIRTUAL_SERV:www -r $hostNmDt

 #get IP address of a server which is working
 actHostNmDt=`$IPVSADM -ln | grep -i masq | awk '{if(NR >1) exit; print $2}' | awk -F ":" '{print $1}'`

  echo "actHostNmHx=$actHostNmHx"

  #convert host name to hex
  actHostNmHx=`$DTOX $actHostNmDt`

  makeNewModAndIns $grp $actHostNmHx
fi