Is WiFi or internet is down?

# Internet checker.md

Internet checker

internet_checker.sh

#/usr/bin/bash

ping_tolerance=1
ok_retry_time=1
fail_retry_time=1

log() {
    echo "$(date) - $@"
}

check_internet() {
  local route="$(ip route)"
  [[ -z "$route" ]] && echo "No route found" && return 1

  local default_gateway=$(echo "$route" | grep default | awk '{print $3}')
  [[ -z "$default_gateway" ]] && echo "No default gateway found" && return 2

  local ping_gateway=$(ping -c1 -w$ping_tolerance $default_gateway | grep "1 received")
  [[ -z "$ping_gateway" ]] && echo "Failed to ping default gateway" && return 3

  local ping_google=$(ping -c1 -w$ping_tolerance google.com | grep "1 received")
  [[ -z "$ping_google" ]] && echo "Failed to ping google.com" && return 4

  return 0
}

# Main loop
while true; do
  internet_status=$(check_internet)
  if [[ $? == 0 ]]; then
    log "Internet is up"

    # Some optimizations
    while [[ -n "$(ping -c1 -w$ping_tolerance google.com | grep "1 received")" ]]; do
      sleep $ok_retry_time
    done
  else
    log "Internet is down: $internet_status"
    echo -n $'\a'
    sleep $fail_retry_time
  fi
done

No route found

Ensure you are connected to your router

No default gateway found

Ensure you are connected to your router

Failed to ping default gateway

Check your router

Failed to ping google.com

Provider issue