Script freenetis ipset

   ##################################################################################
   #! /bin/sh                                                                       #
   #                                                                                #
   # Skript pro presmerovani ip adres. Data jsou nacitana automaticky z freenetisu. #
   #                                                                                #
   # autor Sevcik Roman 2009                                                        #
   # email sevcik.roman@slfree.net                                                  #
   #                                                                                #
   ##################################################################################
   
   IPTABLES=/usr/local/sbin/iptables
   IP_SELF=10.143.128.1
   IP_SELF1=10.143.129.0
   IP_TARGET=212.111.4.121
   PORT_WEB=80
   PORT_REDIRECT=36000

   SET_URL_RANGES=http://freenetis.slfree.net/cs/redirect/ipset/ranges
   SET_URL_PARTNERS=http://freenetis.slfree.net/cs/redirect/ipset/partners
   SET_URL_MEMBERS=http://freenetis.slfree.net/cs/redirect/ipset/members

   # Funkce testuje jestli je dana ip validne zapsana
   # @param ip adresa
   # return 1 pokud je ip validni
   function valid_ip()
   {
       local  ip=$1
       local  stat=1

       if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
         OIFS=$IFS
         IFS='.'
         ip=($ip)
         IFS=$OIFS
         [[ ${ip[0]} -le 255 && ${ip[1]} -le 255 && ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
         stat=$?
       fi
       return $stat
   }

   # Funkce testuje jestli je dany subnet validne zapsany
   # @param subnet
   # return 1 pokud je subnet validni
   function valid_subnet()
   {
       local  subnet=$1
       local  stat=1

       if [[ $subnet =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\/[0-9]{1,2}$  ]]; then
         OIFS=$IFS
         IFS='/'
         subnet=($subnet)
         IFS='.'
         ip=${subnet[0]}
         ip=($ip)
         mask=${subnet[1]}
         IFS=$OIFS
         [[ ${ip[0]} -le 255 && ${ip[1]} -le 255 && ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
         $mask -le 31 
         stat=$?
       fi
       return $stat
   }

   function update()
   {
       #Vymazeme obsah vsech setu
       echo "Erasing content of sets.";
       ipset -F ranges
       ipset -F partners
       ipset -F members

       echo "Downloading data";
       wget -q -O /tmp/ranges $SET_URL_RANGES
       wget -q -O /tmp/partners $SET_URL_PARTNERS
       wget -q -O /tmp/members $SET_URL_MEMBERS

       BAKIFS=$IFS
       IFS=$(echo -en "\n\b")
       exec 3<&0

       #Plnime set partners
       echo "Filling set partnets.";
       exec 0</tmp/partners
       while read LINE
       do
         if valid_subnet $LINE; then echo "$LINE - added to set partners."; ipset -A partners $LINE; else echo "$LINE -  not valid subnet."; fi
       done

       #Plnime set members
       echo "Filling set members.";
       exec 0</tmp/members
       while read LINE
       do
         if valid_ip $LINE; then echo "$LINE - added to set members."; ipset -A members $LINE; else echo "$LINE -  not valid IP address."; fi
       done

       #Plnime set ranges  - je nutne aby se plnil az na konci. Jinak by byly presmerovane ip v dobe kdy se set nenbers a partners teprve plni.
       echo "Filling set ranges.";
       exec 0</tmp/ranges
       while read LINE
       do
         if valid_subnet $LINE; then echo "$LINE - added to set ranges."; ipset -A ranges $LINE; else echo "$LINE -  not valid subnet."; fi
       done

       exec 0<&3
       IFS=$BAKIFS

       #Cleaning up
       rm /tmp/ranges
       rm /tmp/partners
       rm /tmp/members
   }

   case "$1" in
   start)

       echo "Adding sets.";
       ipset -N ranges nethash --hashsize 1024 --probes 4 --resize 50
       ipset -N partners nethash --hashsize 1024 --probes 4 --resize 50
       ipset -N members iphash --hashsize 10000 --probes 8 --resize 50

       echo "Adding firewall rules.";
       #Pravidlo pro pridani ip do setu members. Pokud projde firewallem packet na danou cilovou ip  prida se zdrojova ip do setu members.
       $IPTABLES -t nat -A PREROUTING -m set --set ranges src -d $IP_TARGET -j SET --add-set members src

       #Pokud uz je ip v setu members nebo partners neaplikuje se presmerovani.
       $IPTABLES -t nat -A PREROUTING -m set --set partners src -j ACCEPT
       $IPTABLES -t nat -A PREROUTING -m set --set members src -j ACCEPT

       #Povoleni portu 36000 pro potreby presmerovani. Na tomto portu nasloucha webserver a provede presmerovani na zvolenou url.
       $IPTABLES -t nat -A PREROUTING -m set --set ranges src -p tcp --dport $PORT_REDIRECT -j ACCEPT

       #Presmerovani vseho co miri do internetu a ma cilovy port 80 na port 36000.
       $IPTABLES -t nat -A PREROUTING -m set --set ranges src -p tcp --dport $PORT_WEB -j REDIRECT --to-port $PORT_REDIRECT

       #Vyjimky ip adres a portu ktere budou fungovat i po presmerovani.
       $IPTABLES -t nat -A PREROUTING -m set --set ranges src -p icmp -d $IP_SELF -j ACCEPT
       $IPTABLES -t nat -A PREROUTING -m set --set ranges src -p udp -d $IP_SELF --dport 53 -j ACCEPT
       $IPTABLES -t nat -A PREROUTING -m set --set ranges src -p tcp -d $IP_SELF --dport 22 -j ACCEPT

       $IPTABLES -t nat -A PREROUTING -m set --set ranges src -p icmp -d $IP_SELF1 -j ACCEPT
       $IPTABLES -t nat -A PREROUTING -m set --set ranges src -p udp -d $IP_SELF1 --dport 53 -j ACCEPT
       $IPTABLES -t nat -A PREROUTING -m set --set ranges src -p tcp -d $IP_SELF1 --dport 22 -j ACCEPT

       #Vyjimka pro kecalka pro podporu
       $IPTABLES -t nat -A PREROUTING -m set --set ranges src -p tcp -d 67.23.29.84 --dport 80 -j ACCEPT
       $IPTABLES -t nat -A PREROUTING -m set --set ranges src -p tcp -d 67.23.27.61 --dport 80 -j ACCEPT

       #Jinak vse ostatni zahod.
       $IPTABLES -t nat -A PREROUTING -m set --set ranges src -j DROP

       exit 1
      ;;

      restart)
       $0 stop
       $0 start
       exit 1
      ;;

      update)
       update
       exit 1
      ;;

      stop)

       echo "Deleting firewall rules.";
       #Pravidlo pro pridani ip do setu members. Pokud projde firewallem packet na danou cilovou ip  prida se zdrojova ip do setu members.
       $IPTABLES -t nat -D PREROUTING -m set --set ranges src -d $IP_TARGET -j SET --add-set members src

       #Pokud uz je ip v setu members nebo partners neaplikuje se presmerovani.
       $IPTABLES -t nat -D PREROUTING -m set --set partners src -j ACCEPT
       $IPTABLES -t nat -D PREROUTING -m set --set members src -j ACCEPT

       #Povoleni portu 36000 pro potreby presmerovani. Na tomto portu nasloucha webserver a provede presmerovani na zvolenou url.
       $IPTABLES -t nat -D PREROUTING -m set --set ranges src -p tcp --dport $PORT_REDIRECT -j ACCEPT

       #Presmerovani vseho co miri do internetu a ma cilovy port 80 na port 36000.
       $IPTABLES -t nat -D PREROUTING -m set --set ranges src -p tcp --dport $PORT_WEB -j REDIRECT --to-port $PORT_REDIRECT

       #Vyjimky ip adres a portu ktere budou fungovat i po presmerovani.
       $IPTABLES -t nat -D PREROUTING -m set --set ranges src -p icmp -d $IP_SELF -j ACCEPT
       $IPTABLES -t nat -D PREROUTING -m set --set ranges src -p udp -d $IP_SELF --dport 53 -j ACCEPT
       $IPTABLES -t nat -D PREROUTING -m set --set ranges src -p tcp -d $IP_SELF --dport 22 -j ACCEPT

       $IPTABLES -t nat -D PREROUTING -m set --set ranges src -p icmp -d $IP_SELF1 -j ACCEPT
       $IPTABLES -t nat -D PREROUTING -m set --set ranges src -p udp -d $IP_SELF1 --dport 53 -j ACCEPT
       $IPTABLES -t nat -D PREROUTING -m set --set ranges src -p tcp -d $IP_SELF1 --dport 22 -j ACCEPT

       #Vyjimka pro kecalka pro podporu
       $IPTABLES -t nat -D PREROUTING -m set --set ranges src -p tcp -d 67.23.29.84 --dport 80 -j ACCEPT
       $IPTABLES -t nat -D PREROUTING -m set --set ranges src -p tcp -d 67.23.27.61 --dport 80 -j ACCEPT

       #Jinak vse ostatni zahod.
       $IPTABLES -t nat -D PREROUTING -m set --set ranges src -j DROP

       echo "Deleting sets.";
       ipset -X ranges
       ipset -X partners
       ipset -X members

       exit 1
      ;;
   esac

   exit 0