Ubuntu 16.04 WiFi Restarter

restart.sh

#!/bin/sh


LOGFILE=$(dirname $BASH_SOURCE)/restart-$(date +'%m-%d-%Y').log

echo_log() {
  local msg=$1
  echo "[$(date +'%m-%d-%Y %T')] - $msg" | tee -a $LOGFILE
}

check_ip_address_is_reachable() {
  local check_ip="$1"
  ping -c 1 ${check_ip} >/dev/null
  local is_reachable=$?
  if [[ ${is_reachable} -eq 0 ]]; then
    echo_log "${check_ip} is reachable"
  else
    echo_log "${check_ip} is not reachable"
  fi
  return ${is_reachable}
}

check_port_is_open() {
  local network_address="$1"
  local check_port="$2"
  nc -z ${network_address} ${check_port} >/dev/null
  local is_open=$?
  if [[ ${is_open} -eq 0 ]]; then
    echo_log "${network_address}:${check_port} is open"
  else
    echo_log "${network_address}:${check_port} is not open"
  fi
  return ${is_open}
}

reconnect_wifi() {
  echo_log "Restarting netowork-manager.service"
  sudo systemctl restart network-manager.service
  # local wifi_device="$1"
  # echo_log "Bringing up ${wifi_device} device"
  # nmcli c up ifname ${wifi_device} >/dev/null
  # echo_log "Connecting ${wifi_device}"
  # nmcli d wifi connect wlp2s0
  # echo_log "Finished bringing up ${wifi_device}"
}

compress_previous_log() {
  yesterday=$(date --date="1 day ago" '+%m-%d-%Y')
  yesterday_log="$(dirname ${BASH_SOURCE})/restart-${yesterday}.log"
  yesterday_log_archive="${yesterday_log}.tar.gz"
  if [[ -f $yesterday_log ]]; then
    if [[ ! -f $yesterday_log_archive ]]; then
      tar -zcf $yesterday_log_archive $yesterday_log
    fi
    rm $yesterday_log
  fi
}

main() {
  local wifi_device="wlp2s0"
  local google_dns_ip="8.8.8.8"
  local static_network_ip="192.168.0.8"
  compress_previous_log

  check_ip_address_is_reachable ${google_dns_ip}
  if [[ $? -ne 0 ]]; then
    reconnect_wifi ${wifi_device}
  else
    check_ip_address_is_reachable ${static_network_ip}
    if [[ $? -ne 0 ]]; then
      reconnect_wifi ${wifi_device}
    else
      check_port_is_open ${static_network_ip} 22
      if [[ $? -ne 0 ]]; then
        reconnect_wifi ${wifi_device}
      fi
    fi
  fi
}

main
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