Auto Wake On LAN script for hosts
At the very least, users should consider putting the LOGFILE on /tmp/ rather than on flash.
OpenWrt also does not serve HTML pages in the same way as DD-WRT.
Note also problems with rebooting a router running this script described at https://forum.openwrt.org/t/cant-reboot-while-sleep-script-wol/
Hi guys,
I found on https://www.dd-wrt.com/wiki/index.php/Useful_Scripts#Web_Server_Wake-up this useful script for wake up a host by request.
I use it to wake up my NAS if my Kodi or PC want anything from it.
Requirements:
- Firmware Version: OpenWrt Barrier Breaker 14.07 / LuCI Trunk (0.12+svn-r10530)
- Kernel Version: 3.10.49
Script settings
| Required to change | Variables | Default value | Description |
|---|---|---|---|
| optional | INTERVAL | 5 | repeat the script every N second |
| not required | OLD | empty | should be empty |
| optional | PORT | 80 | it the port who looks the script |
| optional | NUMP | 3 | the retries, before the script gave up |
| yes | TARGET | 192.168.1.1 | the wake up device |
| yes | INTERFACE | br-lan | here you can type in a broadcast address or a interface, i like more interface |
| yes | MAC | 00:00:00:00:00:00 | the target mac adress |
| not required | WOL | /usr/bin/etherwake | the program and path for wol |
| optional | LOGFILE | “/www/wol/index.html” | the log output folder, in this case for the url <ROUTER-IP>/wol/index.html |
| optional | LOGPROG | “logread” | i will read the logs from LOGREAD, but you can also read from “dmesg” or something else |
Instructions
1. Preparation
Install the required packages.
opkg update
opkg install etherwake
2. Auto WoL script
Saving the script.
cat << "EOF" > /bin/autowol.sh #!/bin/sh #Enable JFFS2 and place script in /jffs/ then run on startup in web interface. #You can check the log from http://192.168.1.1/user/wol.html #debugging #set -xv INTERVAL=5 NUMP=3 OLD="" PORT=80 TARGET=192.168.1.1 INTERFACE=br-lan MAC=00:00:00:00:00:00 WOL=/usr/bin/etherwake LOGFILE="/www/wol/index.html" LOGPROG="logread" # default: dmesg echo "<meta http-equiv=\"refresh\" content=\"10\">" > $LOGFILE echo "AUTO WOL Script started at" `date` "<br>" >> $LOGFILE wake_up () { PORT=$1 TARGET=$2 BROADCAST=$3 MAC=$4 NEW=`$LOGPROG | awk '/WOL_LOG/ && /DST='"$TARGET"'/ && /DPT='"$PORT"'/ {print }' | tail -1` SRC=`$LOGPROG | awk -F'[=| ]' '/WOL_LOG/ && /DST='"$TARGET"'/ && /DPT='"$PORT"'/ {print }' | tail -1` LINE=`$LOGPROG | awk '/WOL_LOG/ && /DST='"$TARGET"'/ && /DPT='"$PORT"'/'` if [ "$NEW" != "" -a "$NEW" != "$OLD" ]; then if ping -qc $NUMP $TARGET >/dev/null; then echo "NOWAKE $TARGET was accessed by $SRC and is already alive at" `date` "<br>">> $LOGFILE else echo "WAKE $SRC causes wake on lan at" `date` "<br>">> $LOGFILE $WOL -i $BROADCAST $MAC >> $LOGFILE echo "<br>" >> $LOGFILE sleep 5 fi OLD=$NEW fi } while sleep $INTERVAL; do wake_up $PORT $TARGET $INTERFACE $MAC; done EOF chmod +x /bin/autowol.sh
Pro Tip: Don't copy the code above as it causes a bunch of errors due to a stray CRLF character at the end of each line. Instead just download a copy of the file here, and save yourself a day of troubleshooting!
3. Autostart
First autostart, if the script is ok.
Go to System → Startup → Local Startup and type in:
/bin/autowol.sh
Troubleshooting
Enable debug output:
sh -x -v /bin/autowol.sh
Check the log file: http://192.168.1.1/wol/
Go to Network → Firewall → Custom Rules and add this rule:
iptables -I FORWARD 1 -p tcp -d 192.168.1.1 -m limit --limit 1/min -j LOG --log-prefix "WOL_LOG: " --log-level 7