Created
July 5, 2018 07:30
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#!/bin/sh | |
NOIP_USERNAME="[your-username-at-noip.com]" | |
NOIP_PASSWORD="[your-password-at-noip.com]" | |
NOIP_DDNS_HOSTNAME="[your-hostname].ddns.net" | |
NOIP_UPDATE_URL="https://dynupdate.no-ip.com/nic/update" | |
CACHED_IP_FILE=/tmp/cached_ip | |
SCRIPT_NAME=$(basename $0) | |
SCRIPT_PID=`/bin/pidof $SCRIPT_NAME` | |
SYSLOG_TAG="$SCRIPT_NAME[$SCRIPT_PID]" | |
WGET_CMD="/usr/sbin/wget -O - --no-check-certificate --quiet" | |
WGET_USER_AGENT="--user-agent='$SCRIPT_NAME/1 [your-email]'" | |
PUBLIC_IP=`$WGET_CMD https://checkip.amazonaws.com/` | |
DDNS_IP=`/usr/bin/nslookup $NOIP_DDNS_HOSTNAME 1.1.1.1 | tail -n1 | grep -oE ' ([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+) ' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//'` | |
NOIP_UPDATE_CMD="$WGET_CMD $WGET_USER_AGENT --http-user=$NOIP_USERNAME --http-password=$NOIP_PASSWORD $NOIP_UPDATE_URL?hostname=$NOIP_DDNS_HOSTNAME&myip=$PUBLIC_IP" | |
echo "PUBLIC_IP : '$PUBLIC_IP'" | |
echo "DDNS_IP : '$DDNS_IP'" | |
if [ ! -f "$CACHED_IP_FILE" ]; | |
then | |
echo "File not found: $CACHED_IP_FILE" | |
echo $PUBLIC_IP > $CACHED_IP_FILE | |
CACHED_IP=$PUBLIC_IP | |
else | |
CACHED_IP=`cat ${CACHED_IP_FILE}` | |
echo "$CACHED_IP_FILE : '${CACHED_IP}'" | |
fi | |
echo "CACHED_IP : '${CACHED_IP}'" | |
if [ "$CACHED_IP" == "$PUBLIC_IP" ] && [ "$PUBLIC_IP" == "$DDNS_IP" ]; | |
then | |
logmsg="Public IP [$PUBLIC_IP] did not change for [$NOIP_DDNS_HOSTNAME]" | |
/usr/bin/logger -t $SYSLOG_TAG "$logmsg" | |
else | |
logmsg="Updating [$NOIP_DDNS_HOSTNAME] to new IP [$PUBLIC_IP]" | |
/usr/bin/logger -t $SYSLOG_TAG "$logmsg" | |
fi | |
echo $logmsg | |
echo $NOIP_UPDATE_CMD | |
$NOIP_UPDATE_CMD | |
echo $PUBLIC_IP > $CACHED_IP_FILE | |
exit 0 |
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