To set up the automated feedback for the DynDNS updates, you'll need to use a script that sends notifications about each update and also acknowledges any changes or errors the operation made. Here's how:
1. **Modify the Script**: The initial
cf-dyndns.sh file has a function to send notifications when there are no changes (
STATUS:NO_CHANGE). We can modify this to include an error message if none were found.
2. **Use Notification Functionality**: You need a notification system that can handle both normal updates with "->" and "OK:" messages as well as indicate a DynDNS update without any relevant output (just the return code
0 is fine):
3. **Handle Successful Updates**: Update notifications to include this type of acknowledgment
4. **Set Up Email Verification for Send Message**: Verify that you have a way to send emails to the different targets.
5. **Schedule and Trigger Your Functionality**
6. **Make Script Executable and Link It to Cron Job**
Here's an example script (Note: this is just an abstract representation of your steps, you would adjust it based on your own needs):
``
bash
#!/bin/bash
# DynDNS URL
dynndistool="http://example.com/dynndisupdate"
# Configuration for notification email
SEND_EMAIL=your_email_address@your_server_domain.edu
function trigger_update() {
# Make a GET request to dynndistool with the provided parameters
# Note that 'username', 'password' are replaced by the appropriate DynDNS credentials. (You should replace the following)
response=$(curl -X GET \
"$dynndistool?username=$1&password=$2" \
-s -H "Content-Type: application/x-www-form-urlencoded")
if [ $? -ne 0 ]; then
echo "DynDNS Update Status NO_CHANGE"
# If DynDNS URL returns an error, we send a NO_REPLY.
exit 0
elif [[ $response =~ STATUS:\nNO_CHANGE ]]; then
status=$(echo "$response" | grep -oP "(?<=STATUS:\ ).*" | sed 's/.*//') \; echo "DynDNS Update: STATUS NO_CHANGE"; echo "${1}${2}"; echo "$dynndistool"
else
# Perform other tasks (e.g., update notifications, create a message to send)
status=$(echo "$response" | grep -oP "(?<=STATUS:\ ).*)" | sed 's/.*//') \; echo "DynDNS Update: $status";
# Send notification based on error
fi
# Return value or variable used throughout the functions.
}
# You need a way to get your username and password from the DynDis configur file (or any other method)
echo $(grep "username=" ${0}.conf | cut -d "=" -f2) | xargs -i -n1 echo "${1:-"}
# Get your DynDNS IP address
IP=$(curl -s -H 'User-Agent: hermes-cron' "http://example.com/dynndisip" | grep IP | awk '{print $3}' )
# Trigger the update function every minute.
while true; do (
trigger_update "$1" "$2"
# This is optional - it will continue to increment on interval if no response from dynndistool (see status message).
); done & pid=$!
unset pids
pids+=($pid)
trap "kill $pid" SIGTERM
`
Remember, this script example needs proper setup for it to run properly and should not be run directly in a cron job; instead you would need to make the necessary changes within your bash profile (~/.bashrc
or similar file) by modifying the trigger_update()
function. Once made ready within these files, add the required entries according to your needs.
Your actual configuration requires more information about your dynndisconfig.conf
, including details on DynDNS setup (like username and password), IP address, which dynndisupdate should use (" target="_blank" rel="noopener">http://example.com/dynndisupdate or similar URLs with correct configurations in your dynndis config.), also setting up the send email function.
**Again, these steps are simplified because of restrictions you cannot execute bash scripts directly from some places but here is exactly what you would need to do:**
Note: This may vary based on platform specifics (e.g., Linux for cron job in root directory; Windows commands might be slightly different).
1. Save and install this script by adding a new file named
cf-dyndns.sh, specifying its shebang with a proper path (
#!/bin/bash).
2. In both your bash profile (
~/.bashrc) or another method to initialize cron job setup, add the following at the first section of input (or right after for bash version
<-):
``
bash
#!/bin/bash -l
# Load your config files.
source /path/to/config/dynndissetup.conf # If you have a config file; otherwise replace with actual paths to your configuration script in your cron
`
Don't forget this shebang path for proper script execution.
3. Create these new config-specific scripts and add them under /etc/cron/
instead of ~/.bashrc
. Note that you need administrator privileges if using a bash version older than the latest one. If working on root or in a user profile outside of your own profile directory, ensure this path matches accordingly.
Here is how to achieve this setup:
`
bash
#!/bin/bash
declare -A section1="name=cyro;email='your_email_address@your_server_domain.edu';ipAddress='example.com';status NO_CHANGE"
section2="name=dryrun;email=null;ipAddress=example2.com status OK:0"
echo "[SendMail] { name = SendMail; ipaddress = $ipAddress; from=$section1[from];To=[$section1[to]]}" | sed -f /etc/cron/increase_config.sh
`
Add the script to /etc/cron/
:
`
bash
sudo ln -s "/path/to/your/config/increase_config.sh" /etc/cron/
`
In addition, make sure your bash profile (~/.bashrc
) has an entry that uses source ~/.config/cron/increase_config.sh`, or simply create a shell function to do this (e.g., for root):