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 #!/bin/sh
 #=======================================================
 # create_dual_ovpn_ddwrt.sh  - v1.1.0
 #=======================================================
 # Changelog
 #=======================================================
 # v1.1.0 - 02/20/2012 - Kain0o0
 # - Changed name guessing to match new Strongvpn script
-ip rule add from 192.168.1.100\/30 lookup 4\n\
+# - Created DUAL_SCRIPT variable for user preference
-ip rule add from 192.168.1.104\/29 lookup 4\n\
+# - Created clean_sed function to parse sed output
-ip rule add from 192.168.1.112\/28 lookup 4\n\
+# - Script is easily modified using clean_sed input
-ip rule add from 192.168.1.128\/25 lookup 4\n\
+# - Modified code and added comments for easier reading
 # - Added brakets for notepad++ collapsing support
 # - Added changelog to track changes
 # v1.0.2 - 08/12/2011 - Cfelix (Thanks!)
 # - Added upnp line
 # - Missing \'s for $RULE.  Changed to echo \\\\$\RULE
-echo -e "\033[31m\033[47m                      CREATE_DUAL_OVPN_DDWRT                           \033[0m"
+# - Modified various sed commands
 # v1.0.1 - 11/29/2010 - Kain0o0
 # - Added PORT_RANGE variable for easier modification
 # v1.0.0 - 11/25/2010 - Kain0o0
 # - initial release
 
 # Modify if you have a different DHCP port range
-echo -e "\033[34m\033[47m Input:  Original StrongVPN installer script (ovpnXXX_ddwrt.sh)        \033[0m"
+
-echo -e "\033[34m\033[47m Output: Dual installation script            (ovpn_dual_ddwrt.sh)      \033[0m"
+
 # Please maintain format ip rule add from XXX.XXX.XXX.XXX\/XX lookup 4\n\
 
-GUESS=ovpn???_ddwrt.sh
+
 ip rule add from 192.168.1.100/30 lookup 4
 ip rule add from 192.168.1.104/29 lookup 4
-  echo Is this your file : $GUESS
+ip rule add from 192.168.1.112/28 lookup 4
-  while true
+ip rule add from 192.168.1.128/25 lookup 4
-  do
+
-  echo -n "Please confirm (y or n): "
+
-  read CONFIRM
+# New script name, modify it if you have a naming preference
-  case $CONFIRM in
+DUAL_SCRIPT="ovpn_dual_ddwrt.sh"
-    y|Y|YES|yes|Yes)
+
-      INSTALL_SCRIPT="$GUESS"
+#BANNER
-      break
+{
-    ;;
+
-    n|N|no|NO|No)
+
-      echo Please input the original installer script name:
+
-      read INSTALL_SCRIPT
+echo -e "\033[31m\033[47m                      CREATE_DUAL_OVPN_DDWRT                     v1.1.0\033[0m"
-      if [ ! -z $INSTALL_SCRIPT ];then
+
-        if [ ! -f $INSTALL_SCRIPT ];then
+
-          echo File doesnt exist in this directory
+
-          echo are you sure you copied all the files here?
+
-          echo Check file name \& copy location then restart.
+
-          exit
+
-        fi
+echo -e "\033[34m\033[47m Input:  Original StrongVPN installer script (ovpnXXX_ddwrt_small.sh)  \033[0m"
-      else
+echo -e "\033[34m\033[47m Output: Dual installation script            ($DUAL_SCRIPT)      \033[0m"
-      echo Blank file name given, please retry!
+
-      exit
+}
-      fi
+
-      break
+# Get StrongVPN ddwrt script to modify it
-    ;;
+{
-    *) clear | echo Please enter only y or n
+# Tries to guess the StrongVPN script name
-  esac
+GUESS=ovpn???_ddwrt_small.sh
-  done
+
 if [ -f $GUESS ];then
-  echo Please input the original installer script name:
+echo Is this your file : $GUESS
-  read INSTALL_SCRIPT
+
-  if [ ! -f $INSTALL_SCRIPT ];then
+
-    echo File doesnt exist in this directory
+
-    echo are you sure you copied all the files here?
+
-    echo Check file name \& copy location then restart.
+
-    exit
+y|Y|YES|yes|Yes)
-  fi
+INSTALL_SCRIPT="$GUESS"
 break
 ;;
-cp $INSTALL_SCRIPT temp1
+
 echo Please input the original installer script name:
 read INSTALL_SCRIPT
 if [ ! -z $INSTALL_SCRIPT ];then
-sed 's/openvpn --daemon --config ovpn.conf/sh \/tmp\/etc\/config\/ovpn.wanup/'< temp1 >temp0
+if [ ! -f $INSTALL_SCRIPT ];then
 echo File doesnt exist in this directory
-sed "s/echo -e \"#!\/bin\/sh\\\nkillall openvpn\\\nping -c4 localhost\\\nopenvpn --daemon --config \
+echo are you sure you copied all the files here?
-\/tmp\/ovpn\/ovpn.conf\">\/tmp\/etc\/config\/ovpn.wanup/\
+echo Check file name \& copy location then restart.
-echo -e \"\n\
+
-#!\/bin\/sh\n\
+
-killall openvpn\n\
+
-ping -c4 localhost\n\
+echo Blank file name given, please retry!
-\n\
+
-# Clean up by flushing table 4 and deleting all ip rules\n\
+
-ip route flush table 4\n\
+break
-ip rule show | grep -Ev \\\\\"^(0|32766|32767)\\\\\" | while read PRIO RULE; do ip rule del prio \
+
-\\\\$\{PRIO%%:*\} \\\\$\( echo \$RULE | sed \\\\\"s|all|0\/0|\\\\\" \); done\n\
+
-\n\
+
-# Create backup of default route table\n\
+
-ip route show table main > \/tmp\/ovpn\/route.isp\n\
+
-\n\
+echo Please input the original installer script name:
-# start openvpn\n\
+read INSTALL_SCRIPT
-openvpn --daemon --config \/tmp\/ovpn\/ovpn.conf\n\
+if [ ! -f $INSTALL_SCRIPT ];then
-\n\
+echo File doesnt exist in this directory
-# Add rules for all DHCP routes (192.168.1.100 -> 192.168.1.255)\n\
+echo are you sure you copied all the files here?
-$PORT_RANGE\
+echo Check file name \& copy location then restart.
-\n\
+
-# Flush route cache\n\
+
-ip route flush cache\n\
+
-\n\
+}
-\\\">\/tmp\/etc\/config\/ovpn.wanup/" < temp0 > temp1
+
 # Creating working copy of script
-sed "s/nvram set ovpn_up='iptables -t nat -A POSTROUTING -o \$dev -j MASQUERADE/\
+cp $INSTALL_SCRIPT $DUAL_SCRIPT
-nvram set ovpn_up='iptables -t nat -A POSTROUTING -o \$dev -j MASQUERADE\n\n\
+
-# Use original (pre-openvpn) route for table 4\n\
+
-cat \/tmp\/ovpn\/route.isp | while read ROUTE; do ip route add table 4 \$ROUTE; done\n/" < temp1 > temp0
+
 # Cleans sed output, adds the necessary escape characters needed.
-sed "s/killall -HUP dnsmasq/\
+# Arguments: arg1= variable holding the replacing text
-killall -HUP dnsmasq\n\n\
+#            arg2(optional)=multi if the variable consists of multiple lines
-# Clean up by flushing table 4 and deleting all ip rules\n\
+clean_sed(){
-ip route flush table 4\n\
+pattern="$1"
-ip rule show | grep -Ev \\\\\"^(0|32766|32767)\\\\\" | while read PRIO RULE; do ip rule del prio \
+safe_pattern=$(echo "$pattern" | sed 's/[][\.*/]/\\&/g; s/$$/\\&/; s/^^/\\&/')
-\\\\$\{PRIO%%:*\} \\\\$\( echo \$RULE | sed \\\\\"s|all|0\/0|\\\\\" \); done\n/" < temp0 > temp1
+if [ $2 == "multi" ]; then
 safe_pattern=$(echo "$safe_pattern" | sed 's/$/\\\\n/')
-echo Creating Reboot option....
+
-sed  "s/nvram commit/\
+echo -e $safe_pattern
-nvram commit \n\
+}
-echo Press any key to reboot..... \n\
+
-read dummy_var \n\
+# Modified script text - combined here to make future changes easier
-reboot \n\ /" < temp1 > ovpn_dual_ddwrt.sh
+{
 #TEXT1
-rm temp0 temp1
+# Replaces openvpn --daemon --config ovpn.conf
-chmod +x ovpn_dual_ddwrt.sh
+{
 TEXT1='sh /tmp/etc/config/ovpn.wanup'
 }
 
 #TEXT2
 # The double slashes are necessary since this text will be ran through sed AND echo -e
 # Modifies wanup script
 {
 TEXT2='echo -e "
 #!/bin/sh
 killall openvpn
 upnp -D -W tun0
 ping -c4 localhost
 
 # Clean up by flushing table 4 and deleting all ip rules
 ip route flush table 4
 ip rule show | grep -Ev \\"^(0|32766|32767)\\" | while read PRIO RULE; do ip rule del prio \\${PRIO%%:*} $( echo \\$RULE | sed \\"s|all|0/0|\\" ); done
 
 # Create backup of default route table
 ip route show table main > /tmp/ovpn/route.isp
 
 # start openvpn
 openvpn --daemon --config /tmp/ovpn/ovpn.conf
-sh ovpn_dual_ddwrt.sh
+
 # Add rules for all DHCP routes (192.168.1.100 -> 192.168.1.255)
 '$PORT_RANGE'
 
 # Flush route cache
 ip route flush cache
 
 ">/tmp/etc/config/ovpn.wanup'
 }
 
 #TEXT3
 #  Modifies ovpn_up script
 {
 TEXT3='nvram set ovpn_up='"'"'iptables -t nat -A POSTROUTING -o $dev -j MASQUERADE
 
 # Use original (pre-openvpn) route for table 4
 cat /tmp/ovpn/route.isp | while read ROUTE; do ip route add table 4 $ROUTE; done'
 }
 
 #TEXT4
 # Modifies ovpn_dn script
 {
 TEXT4='killall -HUP dnsmasq
 
 # Clean up by flushing table 4 and deleting all ip rules
 ip route flush table 4
 ip rule show | grep -Ev "^(0|32766|32767)" | while read PRIO RULE; do ip rule del prio ${PRIO%%:*} $( echo $RULE | sed "s|all|0/0|" ); done'"'"' '
 }
 
 #TEXT5
 # Add reboot option
 {
 TEXT5='nvram commit
 echo Press any key to reboot.....
 read dummy_var
 reboot'
 }
 }
 
 # Do the actual modification using the text above
 {
 #TEXT1
 # Replaces openvpn --daemon --config ovpn.conf
 sed -i "s/openvpn --daemon --config ovpn.conf/`clean_sed "$TEXT1"`/" $DUAL_SCRIPT
 
 #TEXT2
 # Modifies wanup script
 sed -i "s/echo -e.*/`clean_sed "$TEXT2" "multi"`/" $DUAL_SCRIPT
 
 #TEXT3
 #  Modifies ovpn_up script
 sed -i "s/nvram set ovpn_up.*/`clean_sed "$TEXT3" "multi"`/" $DUAL_SCRIPT
 
 #TEXT4
 # Modifies ovpn_dn script
 sed -i "s/killall -HUP dnsmasq.*/`clean_sed "$TEXT4" "multi"`/" $DUAL_SCRIPT
 
 #TEXT5
 # Add reboot option
 sed  -i "s/nvram commit/`clean_sed "$TEXT5" "multi"`/" $DUAL_SCRIPT
 
 #CLEANUP
 # Remove blank spaces for clarity
 sed -i 's/^ //' $DUAL_SCRIPT
 }
 
 # Make script executable
 chmod +x $DUAL_SCRIPT
 
 # Ask user if he wants to reboot
 {
 echo
 echo All Done!
 echo
 echo Would you like to start the OpenVPN DD-WRT install?
 echo \(You can manualy install at a later time by running ovpn_dual_ddwrt.sh\)
 while true
 do
 echo -n "Please confirm (y or n): "
 read CONFIRM
 case $CONFIRM in
 y|Y|YES|yes|Yes) break ;;
 n|N|no|NO|No)
 echo Aborting - You can manualy install at a later time by running ovpn_dual_ddwrt.sh
 exit
 ;;
 *) clear | echo Please enter only y or n
 esac
 done
 echo
 echo Running the installation script
 # Run newly created script
 sh $DUAL_SCRIPT
 }