#!/bin/bash
iptables="/sbin/iptables"
iptablesrestore="/sbin/iptables-restore"
ifconfig="/sbin/ifconfig"

#pimp files must be generated by optional-tools/make-pimp utility
pimp_2way_nat="/mnt/mtdblock0/pimp-2way-nat.tmp"
pimp_snat="/mnt/mtdblock0/pimp-snat.tmp"
etchosts="/mnt/mtdblock0/hosts"
restoredata="/mnt/mtdblock0/iptables-restore.in"
wan1="vlan770"
wan2="vlan771"
wan3="vlan772"

echo "*nat" > $restoredata
echo ":PREROUTING ACCEPT [0:0]" >> $restoredata
echo ":POSTROUTING ACCEPT [0:0]" >> $restoredata
echo ":OUTPUT ACCEPT [0:0]" >> $restoredata

# ===============================================================
#  Symetrical SNAT-DNAT using indexed iptables
# ===============================================================

echo -n "Generating new iptables-restore data - two way SNAT/DNAT "

for czfip in `grep -v ^# $pimp_2way_nat|cut -f 1 -d " "`
do
 pubip=`grep "$czfip " $pimp_2way_nat|cut -f 2 -d " "`
 czffirstindex=priv_`ipcalc -n $czfip/20|grep Network|cut -f 4 -d \ |tr [./] _`
 czfsecondindex=priv_`ipcalc -n $czfip/23|grep Network|cut -f 4 -d \ |tr [./] _`
 czfthirdindex=priv_`ipcalc -n $czfip/26|grep Network|cut -f 4 -d \ |tr [./] _`
 pubfirstindex=pub_`ipcalc -n $pubip/27|grep Network|cut -f 4 -d \ |tr [./] _`
 pubsecondindex=pub_`ipcalc -n $pubip/29|grep Network|cut -f 4 -d \ |tr [./] _`

 if ! grep $czffirstindex $restoredata > /dev/null
 then
  echo :$czffirstindex "- [0:0]" >> $restoredata
  echo -A POSTROUTING -d ! 10.0.0.0/8 -s `ipcalc -n $czfip/20|grep Network|cut -f 4 -d \ ` -o $wan1 -j $czffirstindex >> $restoredata
  echo -A POSTROUTING -d ! 10.0.0.0/8 -s `ipcalc -n $czfip/20|grep Network|cut -f 4 -d \ ` -o $wan2 -j $czffirstindex >> $restoredata
  echo -A POSTROUTING -d ! 10.0.0.0/8 -s `ipcalc -n $czfip/20|grep Network|cut -f 4 -d \ ` -o $wan3 -j $czffirstindex >> $restoredata
 fi

 if ! grep $czfsecondindex $restoredata > /dev/null
 then
  echo :$czfsecondindex "- [0:0]" >> $restoredata
  echo -A $czffirstindex -s `ipcalc -n $czfip/23|grep Network|cut -f 4 -d \ ` -o $wan1 -j $czfsecondindex >> $restoredata
  echo -A $czffirstindex -s `ipcalc -n $czfip/23|grep Network|cut -f 4 -d \ ` -o $wan2 -j $czfsecondindex >> $restoredata
  echo -A $czffirstindex -s `ipcalc -n $czfip/23|grep Network|cut -f 4 -d \ ` -o $wan3 -j $czfsecondindex >> $restoredata
 fi

 if ! grep $czfthirdindex $restoredata > /dev/null
 then
  echo :$czfthirdindex "- [0:0]" >> $restoredata
  echo -A $czfsecondindex -s `ipcalc -n $czfip/26|grep Network|cut -f 4 -d \ ` -o $wan1 -j $czfthirdindex >> $restoredata
  echo -A $czfsecondindex -s `ipcalc -n $czfip/26|grep Network|cut -f 4 -d \ ` -o $wan2 -j $czfthirdindex >> $restoredata
  echo -A $czfsecondindex -s `ipcalc -n $czfip/26|grep Network|cut -f 4 -d \ ` -o $wan3 -j $czfthirdindex >> $restoredata
 fi

 if ! grep $pubfirstindex $restoredata > /dev/null
 then
  echo :$pubfirstindex "- [0:0]" >> $restoredata
  echo -A PREROUTING -i $wan1 -d `ipcalc -n $pubip/27|grep Network|cut -f 4 -d \ ` -j $pubfirstindex >> $restoredata
  echo -A PREROUTING -i $wan2 -d `ipcalc -n $pubip/27|grep Network|cut -f 4 -d \ ` -j $pubfirstindex >> $restoredata
  echo -A PREROUTING -i $wan3 -d `ipcalc -n $pubip/27|grep Network|cut -f 4 -d \ ` -j $pubfirstindex >> $restoredata
 fi

 if ! grep $pubsecondindex $restoredata > /dev/null
 then
  echo :$pubsecondindex "- [0:0]" >> $restoredata
  echo -A $pubfirstindex -i $wan1 -d `ipcalc -n $pubip/29|grep Network|cut -f 4 -d \ ` -j $pubsecondindex >> $restoredata
  echo -A $pubfirstindex -i $wan2 -d `ipcalc -n $pubip/29|grep Network|cut -f 4 -d \ ` -j $pubsecondindex >> $restoredata
  echo -A $pubfirstindex -i $wan3 -d `ipcalc -n $pubip/29|grep Network|cut -f 4 -d \ ` -j $pubsecondindex >> $restoredata
 fi

 echo -A $pubsecondindex -i $wan1 -d $pubip/32 -j DNAT --to-destination $czfip >> $restoredata
 echo -A $pubsecondindex -i $wan2 -d $pubip/32 -j DNAT --to-destination $czfip >> $restoredata
 echo -A $pubsecondindex -i $wan3 -d $pubip/32 -j DNAT --to-destination $czfip >> $restoredata
 echo -A $pubsecondindex -i $wan1 -d $pubip/32 -j ACCEPT >> $restoredata
 echo -A $pubsecondindex -i $wan2 -d $pubip/32 -j ACCEPT >> $restoredata
 echo -A $pubsecondindex -i $wan3 -d $pubip/32 -j ACCEPT >> $restoredata


 echo -A $czfthirdindex -s $czfip/32 -o $wan1 -j SNAT --to-source $pubip >> $restoredata
 echo -A $czfthirdindex -s $czfip/32 -o $wan2 -j SNAT --to-source $pubip >> $restoredata
 echo -A $czfthirdindex -s $czfip/32 -o $wan3 -j SNAT --to-source $pubip >> $restoredata
 echo -A $czfthirdindex -s $czfip/32 -o $wan1 -j ACCEPT >> $restoredata
 echo -A $czfthirdindex -s $czfip/32 -o $wan2 -j ACCEPT >> $restoredata
 echo -A $czfthirdindex -s $czfip/32 -o $wan3 -j ACCEPT >> $restoredata

 echo -n .
done
echo " done."

echo -n "Generating new iptables-restore data - one way SNAT "

# ===============================================================
#  SNAT only using indexed iptables (should be rather function, hmm)
# ===============================================================

for czfip in `grep -v ^# $pimp_snat|cut -f 1 -d " "`
do
 pubip=`grep "$czfip " $pimp_snat|cut -f 2 -d " "`
 czffirstindex=priv_`ipcalc -n $czfip/20|grep Network|cut -f 4 -d \ |tr [./] _`
 czfsecondindex=priv_`ipcalc -n $czfip/23|grep Network|cut -f 4 -d \ |tr [./] _`
 czfthirdindex=priv_`ipcalc -n $czfip/26|grep Network|cut -f 4 -d \ |tr [./] _`

 if ! grep $czffirstindex $restoredata > /dev/null
 then
  echo :$czffirstindex "- [0:0]" >> $restoredata
  echo -A POSTROUTING -d ! 10.0.0.0/8 -s `ipcalc -n $czfip/20|grep Network|cut -f 4 -d \ ` -o $wan1 -j $czffirstindex >> $restoredata
  echo -A POSTROUTING -d ! 10.0.0.0/8 -s `ipcalc -n $czfip/20|grep Network|cut -f 4 -d \ ` -o $wan2 -j $czffirstindex >> $restoredata
  echo -A POSTROUTING -d ! 10.0.0.0/8 -s `ipcalc -n $czfip/20|grep Network|cut -f 4 -d \ ` -o $wan3 -j $czffirstindex >> $restoredata
 fi

 if ! grep $czfsecondindex $restoredata > /dev/null
 then
  echo :$czfsecondindex "- [0:0]" >> $restoredata
  echo -A $czffirstindex -s `ipcalc -n $czfip/23|grep Network|cut -f 4 -d \ ` -o $wan1 -j $czfsecondindex >> $restoredata
  echo -A $czffirstindex -s `ipcalc -n $czfip/23|grep Network|cut -f 4 -d \ ` -o $wan2 -j $czfsecondindex >> $restoredata
  echo -A $czffirstindex -s `ipcalc -n $czfip/23|grep Network|cut -f 4 -d \ ` -o $wan3 -j $czfsecondindex >> $restoredata
 fi

 if ! grep $czfthirdindex $restoredata > /dev/null
 then
  echo :$czfthirdindex "- [0:0]" >> $restoredata
  echo -A $czfsecondindex -s `ipcalc -n $czfip/26|grep Network|cut -f 4 -d \ ` -o $wan1 -j $czfthirdindex >> $restoredata
  echo -A $czfsecondindex -s `ipcalc -n $czfip/26|grep Network|cut -f 4 -d \ ` -o $wan2 -j $czfthirdindex >> $restoredata
  echo -A $czfsecondindex -s `ipcalc -n $czfip/26|grep Network|cut -f 4 -d \ ` -o $wan3 -j $czfthirdindex >> $restoredata
 fi

 echo -A $czfthirdindex -s $czfip/32 -o $wan1 -j SNAT --to-source $pubip >> $restoredata
 echo -A $czfthirdindex -s $czfip/32 -o $wan2 -j SNAT --to-source $pubip >> $restoredata
 echo -A $czfthirdindex -s $czfip/32 -o $wan3 -j SNAT --to-source $pubip >> $restoredata
 echo -A $czfthirdindex -s $czfip/32 -o $wan1 -j ACCEPT >> $restoredata
 echo -A $czfthirdindex -s $czfip/32 -o $wan2 -j ACCEPT >> $restoredata
 echo -A $czfthirdindex -s $czfip/32 -o $wan3 -j ACCEPT >> $restoredata

 echo -n .
done
echo " done."

echo COMMIT >> $restoredata