#!/bin/bash
# This script determines which script to run
# based on whether your running on
# ethernet or airport.
# Name check_internet_master.sh or similar
# Attach this script to launchctl to run automatically.

# Alter tobenotified to reflect you email address.
tobenotified='email@email.com'
# Change to your username
user=username
check_internet() {

IS=`/sbin/ping -c 5 8.8.8.8 | grep -c "64 bytes"`
if (test "$IS" -gt "2") then
       echo "Your internet connection appears to be working. Code" $IS
       echo "$(date '+%m/%d/%y @ %H:%M:%S') Your internet connection appears to be working. Code" $IS > /Users/$user/Library/Logs/netcheck.log
       internet_conn="1"
   exit
else
   echo "There appears to be a problem with your internet connection. Will check again in 10 seconds... Code" $IS
   echo "$(date '+%m/%d/%y @ %H:%M:%S') There appears to be a problem with your internet connection. Will check again in 10 seconds... Code" $IS > /Users/$user/Library/Logs/netcheck.log
   internet_conn="0"
   sleep 5
   AA=`/sbin/ping -c 5 8.8.8.8 | grep -c "64 bytes"`
   if (test "$AA" -gt "2") then
       internet_conn="1"
       echo "Your internet connection appears to be working now. Code" $AA
       echo "$(date '+%m/%d/%y @ %H:%M:%S') Your internet connection appears to be working. Code" $AA > /Users/$user/Library/Logs/netcheck.log
            exit
   else
       echo "There is still a problem with your internet connection. Attempting to fix by service restart... Code" $AA
       echo "$(date '+%m/%d/%y @ %H:%M:%S') There is still a problem with your internet connection. Attempting to fix by service restart... Code" $AA > /Users/$user/Library/Logs/netcheck.log
       sudo ifconfig $1 down
       sleep 5
       sudo ifconfig $1 up
       # echo "Your internet connection needed to be restarted" | mail -s "Internet Connection Down on $(date '+%m/%d/%y @ %H:%M:%S')" $tobenotified -f ipdown@no-reply.com -F "Internet Connection Problem"
   fi
fi

}

# alternative to get active network port:
# AI=`ifconfig | grep -B5 " active" | grep -m1  "^...:" | sed "s/\(.*\):.*/\\1/"`

AI=`route get 0.0.0.0 | grep -m1 "interface:" | awk '{print $2}'`
echo "check_internet_master has detected" $AI "as your primary network interface..."
echo "$(date '+%m/%d/%y @ %H:%M:%S') check_internet_master has detected" $AI "as your primary network interface..." > /Users/$user/Library/Logs/netcheck.log
check_internet $AI