autoreconn.sh

root@time:~# cat autorecon.sh
#!/bin/bash

SLEEP=60
GATEWAY=$(ip addr show dev ppp0 | \
          sed -n 3p | \
          awk '{ print $4 }' | \
          sed -e 's:/[0-9]*::' \
)

#TIMER=/var/run/autorecon.timer
TIMER=/tmp/autorecon.timer # for non-root tests
PASS=0

do_dnsstuff()
{
# Whatever ;)
echo "DNS stuff..."
}

do_pass()
{
  ((PASS++))
  echo $(($(date +%s)+($SLEEP*2+5))) > $TIMER
  echo $PASS >> $TIMER
  take_action
}

take_action()
{
# Here are the reconnect attemps number and actions to take.
  case $PASS in
    2|4|5|6) /etc/init.d/dial start;;
    3) /etc/init.d/natfire restart;;
    7) reboot;;
  esac
  exit -$PASS
}

if [ -e $TIMER ]; then
  if [ $(date +%s) -lt $(sed -n "1p" $TIMER) ]; then
    PASS=$(sed -n "2p" $TIMER)
    rm $TIMER
  else
    rm $TIMER
  fi
fi

# See if the ATM bridge or pppd died.
if [ -z $(pidof pppd) ] || [ -z $(pidof br2684ctl) ]; then
  echo "pppd or ATM bridge died."
  do_pass
fi

# See if ppp0 exist in the links.
if [ -z $GATEWAY ]; then
  echo "ppp0 does not exist."
  do_pass
fi

# If ping fails, take actions.
ping -c3 $GATEWAY || do_pass

# If DNS fails, take actions for DNS.
host google.com || do_dnsstuff

exit 0
root@time:~#