#!/bin/bash
#  _____               _           _
# |   __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
# |   __|  _| -_| -_| . | . |     | . | . |   | -_|
# |__|  |_| |___|___|___|___|_|_|_|___|___|_|_|___|
#
#                              Freedom in the Cloud
#
# Generate an email alert if a USB driver is inserted or removed
#
# License
# =======
#
# Copyright (C) 2017-2018 Bob Mottram <bob@freedombone.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

PROJECT_NAME=freedombone

if [ ! -f /tmp/.upgrading ]; then
    UPTIME=$(awk -F '.' '{print $1}' < "/proc/uptime")
    if [ "$UPTIME" -gt 240 ]; then
        ADMIN_USER=$(grep 'Admin user' /root/${PROJECT_NAME}-completed.txt | awk -F ':' '{print $2}')
        MY_EMAIL_ADDRESS=${ADMIN_USER}@$(cat /etc/hostname)

        # Which devices have changed?
        devices_changed=
        if [ -f /tmp/.usb_devices ]; then
            lsusb -v > /tmp/.curr_usb_devices
            devices_changed=$(diff /tmp/.curr_usb_devices /tmp/.usb_devices)
            rm /tmp/.curr_usb_devices
        fi

        echo -e "USB device connected on ${DEVPATH}\\n\\n${devices_changed}" | mail -s "${PROJECT_NAME} USB canary" "${MY_EMAIL_ADDRESS}"
        echo "${ACTION}" > /tmp/usb-canary
        echo "${MY_EMAIL_ADDRESS}" >> /tmp/usb-canary
        date >> /tmp/usb-canary
    fi
fi
lsusb -v > /tmp/.usb_devices