PortKnock4.18 - App Store

-- Overview --
This application is a simple port knocker for the iPhone, generally useful only to network administrators. You *must* have a port knock daemon running on your server for this application to be useful.

Features in this version of Port Knock:
- Password Protection
- Knock Validation
- Import/Export Hosts
- Auto App Launcher(+)
- Knock Progress Screen
- Shows your External IP Address
- Arbitrary number of ports per host
- An unlimited number of host definitions
- TCP/UDP configuration per port
- Selectively sending knocks through WiFi or Carrier/3G networks
- Configurable interpacket delay
- Has no advertising

-- Use Cases --
This app is ideal if you're on a WiFi network but don't have a port knocker on the available computers. If you're sitting behind a NAT, the iPhone/iPod Touch will have the same IP as any of the other computers on your network.
This is also great to use with TouchTerm or any other ssh or telnet software for the iPhone.Just give it the hostname and a list of ports, and whether you want it to send TCP or UDP packets.

-- Brief Description of Port Knocking for the Layman --
Port Knocking is a technique to secure services behind a firewall until a specific knock sequence is given. This is not to be confused with port scanning (a network management tool for discovering open services on a system).

Imagine you left your kids at home alone. You don't want them to open the door for strangers. And when a stranger comes knocking, you don't even want them to come to the door, because you don't want them to know your kids are there. But, when you or other family members come, you might want them to open the door for you. So you teach them to listen for a certain rattat-tat-tat or special knock that only you and your family know.

This is the same concept you can apply to your servers. If you run a knock daemon on your server, this app then lets you send the special knock to it.

A more technical description of port knocking can be found on Wikipedia:
http://en.wikipedia.org/wiki/Port_knocking
-- Additional Info --
If you're in need of a knock server, I personally use Judd Vinet's knock daemon for linux. It's quite easy to use: http://www.zeroflux.org/projects/knock

You can find of information and a nice list of other knock clients and servers over at
http://www.portknocking.org/

-- Notes --
+ There are some restrictions regarding the Auto App Launcher. For SSH, you can only create temporary connections. For Mail, you will always be shown a new compose mail window first. Unfortunately, this is due to the way App integration works on iOS. There's not much I can do to address these issues at this time.
-- Support --
For better support, please send bug reports and feature requests to danny@sungheroes.com, rather than simply posting it in a review.

You can find more info on using PortKnock at the main website:
http://www.sungheroes.com/products/portknock-iphone/

-- History --
2022-02-28 PortKnock 4.18 released. LaunchApp automatically works again. Fixed some import bugs.
2018-01-xx PortKnock 4.12 supports IPv6
2017-09-xx PortKnock 4.0 released for iOS 10.3
2013-02-15 PortKnock 3.2 should work again on iOS5
2011-Jul-10 PortKnock 3.0.833 released. Added password protection, knock validation, import/export hosts, auto app launcher, and knock progress screen.
2010-Dec-14 PortKnock 2.02 released. Added a 'copy hosts' feature. Host/Port reordering should now work correctly. Entry fields should now work properly on iOS 4.2.1.
2010-Sep-25 PortKnock 2.01 is now available in the app store. iPhone 4's should no longer have an issue. If you are experiencing problems, please email me.
2010-Sep-09 The iPhone4 issue should be resolved. A bug fix release has been submitted. Thank you all for your patience!

Version History Various bug fixes. LaunchApp should now work correctly. Fixes some import bugs. Rearranged knock editing screen for clarity. 4.18 03/01/2022 Support for IPv6 destinations.
Added iPhone X support.
Also some minor bug fixes and UI improvements. 4.16 01/20/2021 Support for IPv6 destinations.
Added iPhone X support.
Also some minor bug fixes and UI improvements. 4.13 05/03/2018 Added iPhone X support. Also some minor bug fixes and UI improvements. 4.11 12/11/2017 Entirely refreshed for iOS 10. Added iPad support. It is no longer possible to manually configure the network interface, however it will automatically use what is available (WiFi or cellular). If you have any issues, please contact me: danny@sungheroes.com 4.0 09/16/2017 This should finally fix the issues for iOS5. Sorry for the difficulty! 3.3 04/05/2013 Bug fix for iOS 5 3.2 02/17/2013 *WARNING* iOS5 users, please do not upgrade to this version, as there is a bug that crashes upon startup. Expect a new version soon that will resolve this.

It's been a while since the last update and breaking of the IP resolution. Here's what's been going on since:
- Greatly overhauled the internals for iOS5
- External IP address resolution now works again
- You can now easily repeat a knock
- Logins can now be delayed
- Launch Apps now import and export correctly. They were previously not exported correctly, so you may have to re-enter your Launch Apps if you're restoring from a backup.
- Fixed some (hopefully all!) crashing bugs
- External interface will now try to remember the last selected interface
- Some minor performance improvements
- Password log viewer should now be more readable
- New App Icon (Hope you like it!) 3.1 02/08/2013 -----------------------------
Important note if you're upgrading:
You will see a blank host list when you load the new version. Rest assured all your old data is still safe. Just run the "Import from Old Database" command in the "More" tab to import your old hosts.
-----------------------------

We have a few cool new features for you in this release:
- Password Protection
- Knock Validation
- Import/Export Hosts
- Auto App Launcher(+)
- New Knock Progress Screen

+ There are some restrictions regarding the Auto App Launcher. For SSH, you can only create temporary connections. For Mail, you will always be shown a new compose mail window first. Unfortunately, this is due to the way App integration works on iOS. There's not much I can do to address these issues at this time.
If you have any problems, comments, suggestions, or if you're interested in beta testing future versions, please contact support@sungheroes.com 3.0.833 07/19/2011 New Features:
- You may now copy hosts

Bug Fixes:
- Host and Port reordering now work correctly
- Name/Host entry fields should now work properly on iOS 4.2.1 2.02 12/15/2010 Bug fixes:
- iPhone4 users can now knock through the Carrier (3G/EDGE)
- Minor UI bug fixes 2.01 09/25/2010 02.00 03/10/2010