Monthly Archives: November 2020

Golang, Rust Learning

NextDest

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NextDest allows your device that has a public IPv6 address to be automatically registered and updated its DNS record.

With more and more ISPs offering public IPv6 addresses to their users, we can directly access our devices that have a public IPv6 address. But the public IPv6 address of your device can change from time to time and it's extremely hard to memorise an IPv6 address. 

Therefore we have DNS, a solution from a long time ago. Yet it's also boring and painful if we have to set the DNS record by hand.

That's why I wrote NextDest. The client-side detects the public IPv6 address on your device (by sending a request to the server-side, so everything is in your hand). Once it finds any available public IPv6 address, it will send a registration request to the server-side along with predefined device name (so that the server-side can decide which domain name should be updated). If everything works, the client-side will display the latest DNS record and the public IPv6 address of your device.

However, this is NOT the end of the story. If NextDest exposes your public IPv6 address to the Internet, your device could be attacked. 

So NextDest supports 4 modes:

1. direct mode

Internet <-> Endpoint

The real IPv6 on that device will be used for DNS resolving. 

All ports can be accessed from the Internet.

2. proxy mode

Internet <-> nextdest <-> Endpoint

An available IP will be used from your IP pool (defined in CIDR format, in the server-side config file).

Cloudflare (or other) only acts like a DNS, i.e, the real IP will show up in DNS record.

Network traffic is forwarded by NextDest.

Only ports defined in ports (in the server-side config file) can be accessed from the Internet.

3. cdn mode

Internet <-> Cloudflare <-> Endpoint

The real IPv6 on that device will be only used for DNS zone settings

All network traffic will be proxied by Cloudflare (or any equivalent), i.e, only CDN's IP will show up in DNS record.

Only 80 or 443 or other CDN provider allowed ports can be accessed from the Internet.

4. hybrid mode

It is the combination of proxy mode and cdn mode.

Project code

NextDest server-side source code: https://goth lab.com/ryza-cocoa/nextdest-server

NextDest client-side server code: https://gitlab.com/ryza-cocoa/nextdest

macOS

macOS version of Twitter Image Saver

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A few days ago, I wrote a Twitter image saver with Rust, but it's a cli application, which makes it not so easy for daily use (I have to type some command to start or stop it, also need to edit the JSON config file manually). Therefore I rewrote it in GUI (to be accurate, a status bar application) on macOS.

It would be pretty easy to set up, click the Settings menu, fill in the consumer key and secret, and then select the directory where you'd like to save the images. Finally, add some accounts (without @) you interested into the list! The total number and the total size of images saved for the current session will be displayed in the drop-down menu.

Furthermore, this application's icon is the combination plus some modifications of two original ones; they were made by Anton Kalashnyk and Fauzan Adiima.

The source code of this project is on my GitLab.