[OpenWrt] Telegram alert when a new wireless device associates with access point. (http://spcr.me/openwrt-alert)

boot_alert.sh

#!/bin/sh

# Alerts via telegram after OpenWRT reboot, start monitoring and list of currently connected wireless devices.
#     write-up at: spcr.me/openwrt-alert
# Some modifications: https://gist.github.com/ksverdlov/33a26fed4c4413171171de86ba59c74f

# ~ note ~
# Call from in /etc/rc.local

APIKEY=<YOUR_BOT_API_KEY_HERE>
CHATID_MUTED=<YOUR_MUTED_CHAT_ID_HERE>
TELEGRAM="https://api.telegram.org/bot$APIKEY/sendMessage"
TEXT="Router has rebooted"

TEXT="<b>Router has rebooted</b>"

msg=`/usr/bin/curl --data-urlencode "text=$TEXT" \
    --data-urlencode "chat_id=$CHATID_MUTED" \
    --data "parse_mode=HTML" \
    "$TELEGRAM"`

# Avoid race condition
sleep 30

/usr/sbin/hostapd_cli -a /root/event_alert.sh -B -i wlan0
/usr/sbin/hostapd_cli -a /root/event_alert.sh -B -i wlan1
/root/manual_alert.sh

event_alert.sh

#!/bin/sh

# Alerts via telegram when a device connects or disconnects on OpenWRT's wireless interfaces
#     write-up at: spcr.me/openwrt-alert
# Some modifications: https://gist.github.com/ksverdlov/33a26fed4c4413171171de86ba59c74f

# ~ note ~
# Depends on hostapd_cli

# KNOWN_MAC_LIST is a list of known mac addresses in format 'MAC<space>Description'. Like:
# aa:bb:cc:dd:ee:ff Amazon Echo Ivan

# hostapd_cli event vars
# $1 = interface
# $2 = action
# $3 = MAC Addr

if (echo $2 | grep "CONNECTED$\|DISCONNECTED$"); then

        APIKEY=<YOUR_BOT_API_KEY_HERE>
        CHATID_MUTED=<YOUR_MUTED_CHAT_ID_HERE>
        CHATID_UNMUTED=<YOUR_UNMUTED_CHAT_ID_HERE>
        TELEGRAM="https://api.telegram.org/bot$APIKEY/sendMessage"
        KNOWN_MAC_LIST="/root/known_mac_list"
        device_info=$(grep "^$3\s" $KNOWN_MAC_LIST | cut -f2- -d' ')
        if [ ! -z "$device_info" ]; then
                text="Known device <code>| $3 | $1 | $2 |</code> $device_info"
                msg=$(/usr/bin/curl --data-urlencode "text=$text" \
                        --data-urlencode "chat_id=$CHATID_MUTED" \
                        --data "parse_mode=HTML" \
                        "$TELEGRAM")
                continue
        else
                manufact=$(/usr/bin/curl "https://api.macvendors.com/$3")
                text="Unknown device <code>| $3 | $1 | $2 |</code> $manufact"
                msg=$(/usr/bin/curl --data-urlencode "text=$text" \
                        --data-urlencode "chat_id=$CHATID_UNMUTED" \
                        --data "parse_mode=HTML" \
                        "$TELEGRAM")
        fi

fi

manual_alert.sh

#!/bin/sh

# Alerts via telegram a list of devices connected to OpenWRT's wireless interfaces
#     write-up at: spcr.me/openwrt-alert
# Some modifications: https://gist.github.com/ksverdlov/33a26fed4c4413171171de86ba59c74f

APIKEY=<YOUR_BOT_API_KEY_HERE>
CHATID_MUTED=<YOUR_MUTED_CHAT_ID_HERE>
CHATID_UNMUTED=<YOUR_UNMUTED_CHAT_ID_HERE>
TELEGRAM="https://api.telegram.org/bot$APIKEY/sendMessage"
KNOWN_MAC_LIST="/root/known_mac_list"

NL="
"

known_devices=""
unknown_devices=""

for interface in $(iwinfo | grep ESSID | cut -f 1 -s -d" "); do
    macaddrs=$(iwinfo $interface assoclist | grep dBm | cut -f 1 -s -d" ")
    for mac in $macaddrs; do
        # Ignore occasional bad output of cut
        reqsubstr="freq"
        if [ -z "${mac##*$reqsubstr*}" ]; then
            continue
        fi

        # Check against our list of known MAC addresses
        device_info=$(grep -i "^$mac\s" $KNOWN_MAC_LIST | cut -f2- -d' ')
        if [ ! -z "$device_info" ]; then
            known_devices="${known_devices}$NL<code>$interface | $mac |</code> $device_info"
            continue
        else
            manufact=$(/usr/bin/curl "https://api.macvendors.com/$mac")
            unknown_devices="${unknown_devices}$NL<code>$interface | $mac |</code> $manufact"
            # delay for https://macvendors.com/api
            sleep 2
        fi
    done
done

if [ ! -z "$known_devices" ]; then
    header="Known devices currently connected:"
    msg=$(/usr/bin/curl --data-urlencode "text=$header$known_devices" \
        --data-urlencode "chat_id=$CHATID_MUTED" \
        --data "parse_mode=HTML" \
        "$TELEGRAM")
fi
if [ ! -z "$unknown_devices" ]; then
    header="Unknown devices currently connected:"
    msg=$(/usr/bin/curl --data-urlencode "text=$header$unknown_devices" \
        --data-urlencode "chat_id=$CHATID_UNMUTED" \
        --data "parse_mode=HTML" \
        "$TELEGRAM")
fi