ec2-dynamicip

This sript simply pulls your IP address from a secure php script located on a webserver somewhere on the internet. It then talks to the Amazon AWS EC2 API to update a rule in one of your security groups with your new external IP address. If you have any questions, feel free to email me on opensource [at] emiscience.com

Version

0.0.1

Prerequisites

You will need to have the followin installed and workint up before this script will work properly.

1. Amazon Web Services] Amazon Web Services Account
2. Amazon Web Services CLI Tools - Command line tools for Amazon Web Services * n.b. if you are using OSX follow the Starting Amazon EC2 with Mac OS X guide to install the EC2 tools. I can confirm this works up to and including OSX 10.9 Mavericks.
3. Separate security group for use with this script

Installation

ipecho.php script

1. Copy the script to somewhere with a websites root directory (it can be in a subdirectory too)
2. Permissions are not important
3. Edit the script and set the $secureAgent variable. Use alphanumeric characters [a-Z][0-0]Try to make it fairly long and note it down, you will need it again.
4. test the script with

curl -A "stringxN" http://www.foo.com/ipecho.php

• string = the string you created in step 3

This should only return an IP address with no other text..This means that it's working.

ec2-dynamicip.sh script

1. Copy the script to a location of your choice. I suggest somewhere which is in your path environment
2. Change the value of ipechoURL to be the full URL of the ipecho.php script. e.g. http://www.foo.com/ipecho.php
3. Change the value of ec2SecurityGroupID to match the security group that you intend to use with this script. Please ensure that you use this script with a SEPARATE security group. This will avert the danger of deleting things that shouldnt be deleted
4. Change the value of secureAgent so that it matches the value of the $secureAgent string in ipecho.php
5. Make the script executable.

chmod +x ec2-dynamicip.sh

Usage

To use the script you only have to exectute it. Version 0.0.1 has no command line arguements.

Todo

1. Get the script to deal with NO existing rules
2. Have a menu rather than a yes/no wizard so there is a greater choice of things to do
3. Have command line arguements to make it more scriptable

Proof of Concept

Below is a screenshot of iTerm (Mac OSX)of me showing you before running the ec2-dynamicip.sh script and after. Before the script, I renewed my DHCP lease getting my another dynamic IP from the ISP (i.e. it's not been authorised to access the example internal server I set up). I then ran the script, agreed to both reauthorising the OLD IP, then agreed to authorising the NEW IP...

Finally, presto, I can now ping the server.

License

GNU GENERAL PUBLIC LICENS Version 3

Other

have fun and feel free to contribute! EMI Science wouldn't be where it is today without the opensource community and therefor support it fully.

Thankyou - Adrian Sluijters - Managing Director