Plex Wake On Demand

plex-wol.service

[Unit]
Description=Plex Wake on Demand Service

[Service]
User=root
Type=simple
ExecStart=/bin/bash /opt/scripts/plex-wol.sh
KillMode=mixed

[Install]
WantedBy=multi-user.target

plex-wol.sh

#!/bin/bash

### Plex - Wake On Demand
###
### Author        Alex van den Hoogen
### Last change   Febraury 21, 2019
###

# START CONFIGURATION
mac_address="00:00:00:00:00:00"
plex_server_ip="192.168.1.100"
plex_target_port=32400

banned_ips="localhost or 127.0.0.1 or 192.168.1.1"
docker_ips="172.16.0.0/12"
timeout=1800
# END CONFIGURATION

last_src=""
last_timestamp=$(date +%s)

tcpdump -C 10 -l "tcp[tcpflags] & (tcp-syn) != 0 and dst port $plex_target_port and dst host $plex_server_ip and not (src ($banned_ips) or (src net $docker_ips))" | while read line 
do
    parsed_line=$(echo ${line} | cut -d ' ' -f 1-3)

    if [[ ${parsed_line} == *"amazonaws.com"* ]]; then
        echo "$parsed_line IGNORING - PERM BAN"
    else
        src=$(echo ${parsed_line} | cut -f 3 -d ' ' | cut -f 1-4 -d '.')
        date="$(echo $(date +'%Y-%m-%d')T$(echo ${parsed_line} | cut -f 1 -d ' '))"
        timestamp="$(echo ${date} | date +%s)"
        diff_timestamp=$(expr ${timestamp} - ${last_timestamp})

        if [[ ${last_src} == ${src} && ${diff_timestamp} -lt ${timeout}  ]]; then
            echo "$parsed_line IGNORING - TEMP BAN (last wakeup: $(date -d @${last_timestamp}))"
        else
            last_src=${src}
            last_timestamp=${timestamp}

            wakeonlan ${mac_address} >/dev/null
            echo "$parsed_line WAKING UP!"
        fi
    fi
done