#!/bin/bash
# ifswitch - network interface configuration switching tool v0.9
# with this tool you can switch your w/lan config very fast
# Copyright (c) 2005 by Stefan Behte
#
#  ifswitch is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  ifswitch is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with ifswitch; if not, write to the Free Software
#  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#
# The following can be set in the config file:
# - interface ip (eth0_ip=... or eth0_ip=random or eth0_ip=random#pre.fix)
# - broadcast (eth0_broadcast=...)
# - netmask (eth0_netmask=...)
# - default gateway (defaultgate=...)
# - dns server(s), you can specify multiple lines (dns=ip)
# - mac address; complete, prefix or random (eth0_mac=aa:bb:cc:dd:ee:ff or eth0_mac=random or eth0_mac=random#pr:ef:ix)
# - static arp entries to prevent arp spoofing attacks, you can specify multiple lines (static_arp=ip#mac)
# - wlan ssid & wep key (eth0_ssid=ssid#key)
#
# Merged from llog and wlog (previously written for wlan and lan configuration switching)
#
# Changelog:
# 12.12.2005 - Started coding, alpha ready
# 13.12.2005 - Fixed bug in addconfig()
#            - added showconfig() to the menu
#            - added [k]ill dhcpcd to the menu
#            - rewritten randmac, now you can use a prefix for randmac -> randmac 00:00:86
#            - added RANDOM / randip -> random ips possible, you can also use a prefix -> randip 192.168.0
#            - changed parseconfig() and addconfig() to work with randmac/randip
# 15.12.2005 - added rotate command line switch, useful if you're pentesting ;)
# 18.12.2005 - confirmed that WLAN mode works fine :)
# 27.12.2005 - fixed typo with wlan
#            - fixed severe error with using macs
# 03.01.2005 - created killdhcpcd()
#            - CONFDIR will now be created if it does not exist and you try adding an entry
#
# TODO:
# - exclude mode for RANDOM
# - check if RANDOM ip/mac is already there
# - IP, MAC-Ranges für RANDOM
# - use netmask for calculation of random ip
# - add WPA(2) support
#
# Known bugs:
# - When creating config files via hand you can get into trouble. Just use the menu dialog to create configs.
#
# Written by Stefan Behte
#
# Please send bugs, comments, wishes and success stories to:
# Stefan.Behte at gmx dot net 
#
# Also have a look at my page:
# http://ge.mine.nu/
#

# JUST EDIT THE CONFDIR LINE, NO OTHER LINES NEED TO BE MODIFIED
CONFDIR=/etc/ifswitch
TOKEN="#"

# check if tools are available
if [ "`which ifconfig`" = "" ] > /dev/null 2>/dev/null
then
 echo "Please check if iwconfig is installed."
 exit -1
fi

if [ "`which route`" = "" ] > /dev/null 2>/dev/null
then
 echo "Please check if route is installed."
 exit -1
fi



###################################################################
# get random mac -> randmac
# call it like this: newmac=`randmac`

randmac()
{
 if [ "$1" != "" ]
 then
  newmac="$1"
  j=2
 else
  newmac=
  j=0
 fi

 while [ 1 ]
 do
  if [ "${#newmac}" = "17" ]  # a mac has 6 bytes + 5 delimiters -> 17 chars -> 00:11:22:33:44:55
  then
   break
  fi

  if [ "$j" = "2" ]
  then
   newmac="${newmac}":
   j=0
  fi

  nr=$[$RANDOM % 16]
  if [ "$nr" -lt 10 ]; then newmac="${newmac}${nr}"; fi
  if [ "$nr" = "10" ]; then newmac="${newmac}a"; fi
  if [ "$nr" = "11" ]; then newmac="${newmac}b"; fi
  if [ "$nr" = "12" ]; then newmac="${newmac}c"; fi
  if [ "$nr" = "13" ]; then newmac="${newmac}d"; fi
  if [ "$nr" = "14" ]; then newmac="${newmac}e"; fi
  if [ "$nr" = "15" ]; then newmac="${newmac}f"; fi
  j=$[$j + 1]

 done
 echo "$newmac"
}  
###################################################################



randip()
{
 if [ "$1" != "" ]
 then
  newip="$1"
 else
  newip=
 fi

 while [ 1 ]
 do

  nr=$[$RANDOM % 256]
  if [ "$newip" = "" ]
  then
   newip=$nr
  else
   newip=${newip}.$nr
  fi

  if [[ $newip == *.*.*.* ]]
  then
   break;
  fi

 done
 echo $newip
}




showconfig()
{
 echo
 count=0
 ls -1 $CONFDIR/* | while read line
 do 
  count=$[$count +1]
  echo -n "[$count]: "
  grep "name=" $line | awk -F= '{print $2}'
 done
}




chooseconfig()
{
 showconfig
 echo "[q]uit"
 echo -n ">"
 read nr
 if [ "$nr" != "q" ] && [ "$nr" != "e" ]
 then
  parseconfig "`ls -1 $CONFDIR/* | head -n $nr | tail -n 1`"
  read moo
 fi
}




addconfig()
{
 if [ ! -e $CONFDIR ]
 then
  mkdir $CONFDIR && echo Created CONFDIR:$CONFDIR
 fi

 echo
 echo "Just press Enter if you do not wish to specify."
 echo -n "filename>"
 read FILE

 echo -n "description>"
 read desc
 echo "name=\"${desc}\"" >> $CONFDIR/$FILE

 echo -n "interface>"
 read iface

 echo -n "ssid#key>"
 read ssid
 if [ "$ssid" != "" ]
 then
  echo "${iface}_ssid=$ssid" >> $CONFDIR/$FILE
 fi

 echo -n "mac>"
 read mac
 if [ "$mac" != "" ]
 then
  if [ "$mac" = "RANDOM" ] || [ "$mac" = "random" ]
  then
   echo -n "mac-prefix>"
   read macpre

   if [ "$macpre" = "" ]
   then
    echo "${iface}_mac=${mac}" >> $CONFDIR/$FILE      # no prefix, just random
   else
    echo "${iface}_mac=${mac}${TOKEN}${macpre}" >> $CONFDIR/$FILE  # random with prefix
   fi
  else
   echo "${iface}_mac=$mac" >> $CONFDIR/$FILE  # MAC was completely specified
  fi
 fi

 echo -n "ip>"
 read ip
 if [ "$ip" != "" ]
 then
  if [ "$ip" = "RANDOM" ] || [ "$ip" = "random" ]
  then
   echo -n "ip-prefix>"
   read ippre

   if [ "$ippre" = "" ]
   then
    echo "${iface}_ip=${ip}" >> $CONFDIR/$FILE      # no prefix, just random
   else
    echo "${iface}_ip=${ip}${TOKEN}${ippre}" >> $CONFDIR/$FILE  # random with prefix
   fi
  else
   echo "${iface}_ip=$ip" >> $CONFDIR/$FILE
  fi
 fi

 echo -n "netmask>"
 read netmask
 if [ "$netmask" != "" ]
 then
  echo "${iface}_netmask=$netmask" >> $CONFDIR/$FILE
 fi

 echo -n "broadcast>"
 read broadcast
 if [ "$broadcast" != "" ]
 then
  echo "${iface}_broadcast=$broadcast" >> $CONFDIR/$FILE
 fi

 echo -n "default gateway>"
 read defaultgate
 if [ "$defaultgate" != "" ]
 then
  echo "defaultgate=$defaultgate" >> $CONFDIR/$FILE
 fi

 dns=dummy
 while [ "$dns" != "" ]
 do
  echo -n "dns>"
  read dns
  if [ "$dns" != "" ]
  then
   echo "dns=$dns" >> $CONFDIR/$FILE
  fi
 done

 static=dummy
 while [ "$static" != "" ]
 do
  echo -n "static arp entry [IP#MAC]>"
  read static
  if [ "$static" != "" ]
  then
   echo "static_arp=$static" >> $CONFDIR/$FILE
  fi
 done

}


delconfig()
{
 showconfig
 echo "[q]uit"
 echo -n ">"
 read nr
 if [ "$nr" != "q" ] && [ "$nr" != "e" ]
 then
  rm -f "`ls -1 $CONFDIR/* | head -n $nr | tail -n 1`" && echo "OK" || echo FAILED
 fi
 sleep 1
}


parseconfig()
{

 cat $1 | while read line
 do
  one=`echo $line | awk -F= '{print $1}'`
  two=`echo $line | awk -F= '{print $2}'`
  
  if [ "$one" = "defaultgate" ]
  then
   echo -n "Setting default gateway $two: "
   route add default gw $two &>/dev/null && echo OK || echo FAILED
  fi

  if [ "$one" = "dns" ]
  then
   echo -n "Setting dns server $two: "
   if [ "$dns" = "already" ]
   then
    echo "nameserver $two" >> /etc/resolv.conf && echo OK || echo FAILED
   else
    echo "nameserver $two" > /etc/resolv.conf && echo OK || echo FAILED
    dns=already
   fi
  fi

  if [[ "${one}" == *_netmask ]]
  then
   iface=`echo $one | awk -F_ '{print $1}'`
   echo -n "Setting netmask $two on interface $iface: "
   ifconfig $iface netmask $two &>/dev/null && echo OK || echo FAILED
  fi

  if [[ "${one}" == *_broadcast ]]
  then
   iface=`echo $one | awk -F_ '{print $1}'`
   echo -n "Setting broadcast $two on interface $iface: "
   ifconfig $iface broadcast $two &>/dev/null && echo OK || echo FAILED
  fi

  if [[ "${one}" == *_mac ]]
  then
   iface=`echo $one | awk -F_ '{print $1}'`
   if [[ "${two}" == RANDOM* ]]  || [[ "${two}" == random* ]]    # if iface_mac=RANDOM -> get random mac
   then
    smac=`echo $two | awk -F"$TOKEN" '{print $2}'`
    if [ "$smac" != "" ]
    then
     two=`randmac ${smac}`
     echo -n "Setting random mac $two (prefix $smac) on interface $iface: "
    else
     two=`randmac`
     echo -n "Setting random mac $two on interface $iface: "
    fi
   else
    echo -n "Setting mac $two on interface $iface: "
   fi
 
   ifconfig $iface down &>/dev/null && ifconfig $iface hw ether $two &>/dev/null && ifconfig $iface up &>/dev/null && echo OK || echo FAILED
  fi



  if [[ "${one}" == *_ip ]]
  then
   iface=`echo $one | awk -F_ '{print $1}'`
   if [[ "${two}" == RANDOM* ]] || [[ "${two}" == random* ]]    # if iface_ip=RANDOM -> get random ip
   then
    sip=`echo $two | awk -F"$TOKEN" '{print $2}'`
    if [ "$sip" != "" ]
    then
     two=`randip ${sip}`
     echo -n "Setting random ip $two (prefix $sip) on interface $iface: "
    else
     two=`randip`
     echo -n "Setting random ip $two on interface $iface: "
    fi
    ifconfig $iface $two &>/dev/null && echo OK || echo FAILED
   else
    if [ "$two" = "dhcp" ]
    then
     echo -n "Using DHCP auto configuration: "
     dhcpcd &>/dev/null && echo OK || echo FAILED
    else
     echo -n "Setting ip $two on interface $iface: "
     ifconfig $iface $two &>/dev/null && echo OK || echo FAILED
    fi
   fi
 
  fi

  ## static arp entries, multiple are possible
  if [[ "${one}" == static_arp ]]
  then
   iface=`echo $one | awk -F_ '{print $1}'`  
   staticip=`echo $two | awk -F"$TOKEN" '{print $1}'`
   staticarp=`echo $two | awk -F"$TOKEN" '{print $2}'`
   echo -n "Adding static arp entry $staticip/$staticarp : "
   arp -s $staticip $staticarp &>/dev/null && echo OK || echo FAILED
  fi

  ## WLAN
  # eth0_ssid=WLAN#12345
  if [[ "${one}" == *_ssid ]]
  then
   iface=`echo $one | awk -F_ '{print $1}'`
   essid=`echo $two | awk -F"$TOKEN" '{print $1}'`
   key=`echo $two | awk -F"$TOKEN" '{print $2}'`

   if [ "$key" != "" ]
   then
    echo -n "Using essid $essid with key $key on interface $iface: "
    iwconfig $iface essid $essid key $key &>/dev/null && echo OK || echo FAILED
   else
    echo -n "Using essid $essid on interface $iface: "
    iwconfig $iface essid $essid &>/dev/null && echo OK || echo FAILED
   fi
  fi

 done
}




testinet()
{
 echo

 dgw=`route -n | grep ^0.0.0.0 | awk '{print $2}'`
 printf "ping default gateway ($dgw)\t"
 ping -c1 -W 1 $dgw &>/dev/null
 if [ "$?" = "0" ]
 then   
  echo -e "[\033[1;32mOK\033[0m]"
 else
  echo -e "[\033[1;31mFAILED\033[0m]"
 fi
 
 printf "resolve www.google.com\t\t\t"
 host www.google.de &>.dns
 if grep "has add" .dns &>/dev/null
 then
  echo -e "[\033[1;32mOK\033[0m]"
 else
  echo -e "[\033[1;31mFAILED\033[0m]"
 fi
 rm .dns
  
 printf "ping www.google.com\t\t\t"
 ping -c1 -W 1 www.google.com &>/dev/null
 if [ "$?" = "0" ]
 then   
  echo -e "[\033[1;32mOK\033[0m]"
 else
  echo -e "[\033[1;31mFAILED\033[0m]"
 fi

 read moo
}


killdhcpcd()
{
 killall -9 dhcpcd &>/dev/null
 rm -f /var/run/dhcpcd* &>/dev/null
}




menu()
{
 clear
 echo "ifswitch - network interface config switcher v0.9"
 echo ""
 echo "[u]se existing config"
 echo "[s]how configs"
 echo "[a]dd network configuration"
 echo "[d]elete an existing config"
 echo "[t]est internet connectivity"
 echo "[k]ill running dhcpcd"
 echo "[r]estart pcmcia services"
 echo "[e]nd"
 echo -n ">"
 read line

 if [ "$line" = "" ]
 then   
  line=dummy
 fi
  
 case $line in
  u) chooseconfig;;
  s) showconfig;read moo;;
  a) addconfig;;
  d) delconfig;;
  t) testinet;;
  k) killdhcpcd;;
  r) echo "";/etc/init.d/pcmcia restart;;
  e) echo "";clear && exit 1;; 
  q) echo "";clear && exit 1;; 
 esac
 
}

if [ "$1" != "" ]
then
 if [ "$1" = "-h" ] || [ "$1" = "--help" ]
 then
  echo
  echo "ifswitch - network interface config switcher v0.9"
  echo "usage: ifswitch [Config-NR] [rotate] [time to wait between rotate]"
  echo "                [-show]"
  echo "                Command line mode is mostly only used for rotate-mode"
  echo "                Call ifswitch without arguments to use the menu"
  echo
  exit -1
 fi

 if [ "$2" = "rotate" ] && [ "$3" != "" ]
 then
  while [ 1 ]
  do
   parseconfig "`ls -1 $CONFDIR/* | head -n $1 | tail -n 1`"
   echo
   sleep $3
  done
 fi

 if [ "$1" = "-show" ] || [ "$1" = "-s" ]
 then
  showconfig
  echo
  exit 1
 fi

 parseconfig "`ls -1 $CONFDIR/* | head -n $1 | tail -n 1`" 
 echo
 exit
fi



while [ 1 ]
do
 clear
 menu
done