#!/usr/bin/env bash

PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin

datum=`/bin/date +"%d.%m.%Y"`

email_to=$1
email_to=${email_to:="root"}

email_from="`whoami`@`hostname --long`"

file=/tmp/mail_ip-up$$

if [ -f /etc/ddclient.conf ]; then

   # Check, if this is the interface used for DynDNS (there could be other pppds
   eval `sed -n 's/\(if=[^  ,]*\)/\1/p' /etc/ddclient.conf`

   ## - check if interface used by dydns is present
   ## -
   for _IFACE in `ifconfig | grep -e"^ppp" | cut -d" " -f1 `; do
      if [ "$_IFACE" = "$if" ];then
         PPP_IFACE=$_IFACE
         break
      fi
   done
fi

if [ "$PPP_IFACE" ] ; then
   PPP_REMOTE=`ifconfig  $PPP_IFACE 2>/dev/null | grep -e "P-[tz]-P" | cut -d":" -f3 | cut -d " " -f1`
   PPP_LOCAL=`ifconfig  $PPP_IFACE 2>/dev/null | grep -e "P-[tz]-P" | cut -d":" -f2 | cut -d " " -f1`
else
   INET_INTERFACE="$(netstat -rn | grep -e"^0.0.0" | awk '{print$8}')"
   EXTERN_IPv4="$(ifconfig | grep -A 1 $INET_INTERFACE | grep "inet Adresse" | cut -d":" -f2 | cut -d " " -f1)"
   EXTERN_IPv6="$(ifconfig | grep -A 3 $INET_INTERFACE | grep -i global | grep -E "^\s+inet6-" | awk '{print$2}')"
   if [[ -z "$EXTERN_IPv4" ]] ; then
      EXTERN_IPv4="$(ip addr show $INET_INTERFACE | grep -E "\s+inet\s+" | awk '{print$2}')"
   fi
   if [[ -z "$EXTERN_IPv6" ]] ; then
      EXTERN_IPv6="$(ip addr show $INET_INTERFACE | grep global | grep -E "\s+inet6\s+" | awk '{print$2}')"
   fi

fi


DNS_SERVER=`cat /etc/resolv.conf | grep -v -e"^#" | grep nameserver | cut -d " " -f2`
DEFAULT_GW=`netstat -rn | grep -e"^0.0.0" | awk '{print$2}'`;

echo "" > $file
echo " *******************************************************" >> $file
echo " ***          This is an autogenerated mail          ***" >> $file
echo "" >> $file
echo -e "\tHost.........................: `hostname --long`" >> $file
echo "" >> $file
echo -e "\tSender.......................: $email_from" >> $file
echo "" >> $file
if [ "$PPP_IFACE" ] ; then
   echo -e "\tInterface name...............: $PPP_IFACE" >> $file
   echo -e "\tLocal IP number..............: $PPP_LOCAL" >> $file
   echo -e "\tPeer  IP number..............: $PPP_REMOTE" >> $file
   if [ "$USEPEERDNS" ] && [ "$DNS1" ] ; then
      echo -e "\tNameserver 1.................: $DNS1" >> $file
      if [ "$DNS2" ] ; then
         echo -e "\tNameserver 2.................: $DNS2" >> $file
      fi
   fi
else
   if [ "$INET_INTERFACE" ];then
      echo -e "\tInterface extern.............: $INET_INTERFACE" >> $file
      echo "" >> $file
      declare -i i=1
      for ip in $EXTERN_IPv4 ; do
         if [ $i -eq 1 ]; then 
            echo -e "\tLocal IPv4 address...........: $ip" >> $file
         else
            echo -e "\t                               $ip" >> $file
         fi
         let i++
      done
      i=1
      for ip in $EXTERN_IPv6 ; do
         if [ $i -eq 1 ]; then
            echo "" >> $file
            echo -e "\tLocal IPv6 address...........: $ip" >> $file
         else
            echo -e "\t                               $ip" >> $file
         fi
         let i++
      done
   fi
fi
echo "" >> $file
if [ "$DEFAULT_GW" ] ; then
   echo -e "\tDefault Gateway..............: $DEFAULT_GW" >> $file
fi
echo "" >> $file
declare -i i=1
for dns in $DNS_SERVER ; do
   echo -e "\tNameserver $i.................: $dns" >> $file
   let i++
done
echo "" >> $file
echo -e "\tDate.........................: `date +\"%d.%m.%Y\"`" >> $file
echo -e "\tTime.........................: `date +\"%H:%M:%S\"`" >> $file
echo "" >> $file
echo " ***                                                 ***" >> $file
echo " *******************************************************" >> $file


echo -e "From:${email_from}\nTo:${email_to}\nSubject:Test on `hostname --long` at  $datum\n\n`/bin/cat $file`" | /usr/sbin/sendmail -F '`whoami`' -f $email_from  $email_to


rm -f $file