Last active
January 27, 2022 03:03
-
-
Save WallaceTan/346997521394db294d1c121e955fab5a to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/bin/sh | |
MY_DDNS_HOSTNAME="[your-hostname].asuscomm.com" | |
MYIP_FILE=/tmp/myip | |
SCRIPT_NAME=$(basename $0) | |
SCRIPT_PID=`/bin/pidof $SCRIPT_NAME` | |
SYSLOG_TAG="$SCRIPT_NAME[$SCRIPT_PID]" | |
PUBLIC_IP=`/usr/sbin/wget -O - --no-check-certificate --quiet https://checkip.amazonaws.com/` | |
DDNS_IP=`/usr/bin/nslookup $MY_DDNS_HOSTNAME ns1.asuscomm.com | tail -n1 | sed -e 's/Address 1: //'` | |
UPDATE_DDNS="/usr/sbin/ez-ipupdate -S dyndns -i eth0 -a $PUBLIC_IP -h $MY_DDNS_HOSTNAME -A 2 -s nwsrv-ns1.asus.com" | |
echo "PUBLIC_IP : '$PUBLIC_IP'" | |
echo "DDNS_IP : '$DDNS_IP'" | |
if [ ! -f "$MYIP_FILE" ]; | |
then | |
echo "File not found: $MYIP_FILE" | |
echo $PUBLIC_IP > $MYIP_FILE | |
MYIP=$PUBLIC_IP | |
else | |
MYIP=`cat $MYIP_FILE` | |
echo "$MYIP_FILE : $MYIP" | |
fi | |
echo "MYIP : '$MYIP'" | |
if [ "$MYIP" == "$PUBLIC_IP" ] && [ "$PUBLIC_IP" == "$DDNS_IP" ]; | |
then | |
logmsg="Public IP $MYIP did not change" | |
/usr/bin/logger -t $SYSLOG_TAG "$logmsg" | |
exit 0 | |
else | |
logmsg="Public IP changed" | |
/usr/bin/logger -t $SYSLOG_TAG "$logmsg" | |
logmsg="Updating $MY_DDNS_HOSTNAME to new IP: $MYIP" | |
/usr/bin/logger -t $SYSLOG_TAG "$logmsg" | |
$UPDATE_DDNS | |
exit 1 | |
fi |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Hi, thanks for creating this script. I did find a small error.
You have to update the /tmp/myip (echo $PUBLIC_IP > $MYIP_FILE) file after line 37, $UPDATE_DDNS.
If not this script will continually run $UPDATE_DDNS after IP change.