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<div align="center">
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  <a href="" rel="noopener">
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  <img width=200px height=200px src="app/src/main/res/mipmap-xxhdpi/ic_launcher.png" alt="Project logo"></a>
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<div align=center>
    <h3 align="center">Nebulo</h3>
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<div align="center">

  [![Apk size](https://img.shields.io/badge/Apk%20file%20size-4.7%20MB-blue)]() 
  [![License](https://img.shields.io/badge/license-GPLv3-blue.svg)](/LICENSE)
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  <a href="https://weblate.frostnerd.com/engage/nebulo/?utm_source=widget">
    <img src="https://weblate.frostnerd.com/widgets/nebulo/-/svg-badge.svg" alt="Übersetzungsstatus" />
  </a> 
[![pipeline status](https://git.frostnerd.com/PublicAndroidApps/smokescreen/badges/master/pipeline.svg)](https://git.frostnerd.com/PublicAndroidApps/smokescreen/commits/master)
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</div>

---

# About
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Nebulo is a free, open-source, non-root and small sized DNS changer for Android utilizing dns-over-https and dns-over-tls to bring privacy and security to your phone.
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It is fast, contains no ads or tracking and offers a lot of flexibility.
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# My mission
My mission is to provide access to dns-over-tls and dns-over-https as a tool against censorship and tracking. Many countries block controversial or government-critical websites using DNS which can possibly be circumvented using either of those protocols.
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The second topic, tracking, is nearly as important as the topic of censorship. Many ISPs use their own DNS servers as a way of tracking their users. Using DoH/DoT puts an end to this by encrypting your dns queries.

# How it works
Nebulo uses the VPN API of the Android system to create a dummy VPN which intercepts all packets for the dns servers of your device. This dummy VPN is __not__ a real VPN and does not tunnel your packets - it only handles dns packets. As only one VPN can be activate at any given time you have to decice between using Nebulo or a real VPN.

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## Non-VPN mode
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Look in the [FAQ](FAQ.md).
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## What this is based on
Nebulo is a completely original piece of software. It doesn't use any other dependency under the hood for the dns capabilities. Check the [dependencies](https://git.frostnerd.com/PublicAndroidApps/smokescreen/blob/master/app/build.gradle#L100) to see what is used for everything build around DoH/DoT.

## Incompatibilities, compatibilities and possible problems 
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- As mentioned no other VPN can be active when Nebulo is running (at least when not running in Non-VPN mode mentioned above)
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- Nebulo works fine with non-VPN firewalls in place (such as AFWall+), but changes in firewall profiles [could break the VPN](https://git.frostnerd.com/PublicAndroidApps/smokescreen/issues/84), requiring a restart of Nebulo.
- Other means of ad-blocking, like modifying the `/etc/hosts` file or the `AdAway` app go hand in hand with Nebulo as well. 
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    - The AdGuard app might cause Nebulo not to receive DNS queries

## Core features
The app consists of a few core features:
 * Dns forwarding using dns-over-https and dns-over-tls
 * A customizable in-memory DNS cache
    * You can configure minimum caching time and default caching times
 * A list of servers with a lot of default entries
    * You can add your own servers as well
 * A DNS speed test
 * Query logging
 * DNS rules, where you can specify your own IP addresses for hosts
    * Rules can be imported from files and URLs (supports 4 different formats)
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    * You can block hosts by using 0.0.0.0 and ::1 as targets (If you check the box "Block this host" those targets are automatically used. You don't have to do anything else.)
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    * The DNS rules prevent CNAME cloaking
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 * Highly customizable settings
    * Disable IPv4/IPv6
    * Allow captive portals
    * Allow search domains on the current network
    * ... And more
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# FAQ
For a growing collection of frequenty asked questions (FAQ), take a look [here](FAQ.md).

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# Help wanted
Requesting your support: the app is getting closer to a proper release but it's still missing an important aspect: translations.
Translations are important to reach as broad of an audience as possible and for non-english speakers to be able to use the app to it's full extent.
Head over to the [translation guide](TRANSLATING.md) to see how you can help!

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# Installation
The app is distributed over the play store, F-Droid and as .apk file.
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## Play store
Go to the [play store](https://play.google.com/store/apps/details?id=com.frostnerd.smokescreen&), download the app and have fun.

## F-Droid
1. Add the repository on your F-Droid app by clicking [this link](https://fdroid.frostnerd.com/fdroid/repo?fingerprint=74BB580F263EC89E15C207298DEC861B5069517550FE0F1D852F16FA611D2D26).
    - Or add it yourself, fdroid.frostnerd.com/fdroid with fingerprint 74BB580F263EC89E15C207298DEC861B5069517550FE0F1D852F16FA611D2D26
    - You can use the [QR-Code as well](material/fdroid_qr.jpg) .
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    - I recommend using [Aurora Droid](https://gitlab.com/AuroraOSS/auroradroid) , it contains the repository by default
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2. (Optional, for older versions of Nebulo) Add the F-Droid archive by clicking [this link](https://fdroidarchive.frostnerd.com/?fingerprint=74BB580F263EC89E15C207298DEC861B5069517550FE0F1D852F16FA611D2D26).
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    -  Or add it yourself, fdroidarchive.frostnerd.com with fingerprint 74BB580F263EC89E15C207298DEC861B5069517550FE0F1D852F16FA611D2D26
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3. Update your repositories (by pulling down to refresh)
4. Search for Nebulo
5. Download the app.
6. Don't forget to check for updates sometimes.
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## Binary
The file is distributed as .apk file in two places:
- In the [telegram group](https://t.me/joinchat/I54nRleveRGP8IPmcIdySg)
- In the automated build system (CI) here in GitLab. [Click here](https://git.frostnerd.com/PublicAndroidApps/smokescreen/-/jobs/artifacts/master/raw/app/build/outputs/apk/normal/release/app-normal-release.apk?job=build_release) to download the latest signed build.
    - The latest signed build isn't always the current release, keep in mind that those are merely signed development builds.
    
# Community
Want to be always up-to-date on the development of this app? Looking for a way to contact the developer?

Join our [Telegram group](https://t.me/joinchat/I54nRleveRGP8IPmcIdySg)!
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(Alternativly [the channel](https://t.me/NebuloUpdates) , which contains only updates and nothing else)
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# Issues, feature requests and questions
Have an idea, question or encountered a bug? Feel free to create an issue [right here in GitLab](https://git.frostnerd.com/PublicAndroidApps/smokescreen/issues).

# Developer contact
There are several ways for you to contact the developer:

**E-Mail**: [daniel.wolf@frostnerd.com](mailto:daniel.wolf@frostnerd.com)

**Telegram**: [@Ch4t4r](https://t.me/Ch4t4r)

**Skype**: [daniel38452](skype:daniel38452)

# Credits
A list of some extraordinary people who contributed to this project:
 - App icon and notification icon by [RKBDI](http://dribbble.com/rkbdi).
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 - Turkish translation by Kemal Oktay Aktoğan
 - Russian translation by [bruleto](https://t.me/bruleto)
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 - Dutch translation by Bas Koedijk
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 - Portuguese translation by Rafael W. Bohnenberger
 - Indonesian translation by Gloeyisk
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 - Catalan translation by Daniel Alomar
 - Spanish translation by Victor Bayas
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<br/>
<br/>

**Want to see your name here? Feel free to contribute!**
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# License
This work is licensed under the GNU GPLv3 License. Different license-agreements can be made with the developer, if needed.


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Copyright (C) 2020   Daniel Wolf
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<br>
<br>
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Please be aware that I'm not going to tolerate exact copies of this app on the Play Store. This project took a lot of work, not only from me, but many alpha/beta testers and translators. Copying is - per the license - generally allowed, but uploading a nearly identical version to the Play Store would be impersonation as per Google policy.
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# Third-party content
This work contains third-party content, namely:
- [sentry-java](https://github.com/getsentry/sentry-java) for crash-reporting
   - License: [BSD 3-Clause revised ](https://opensource.org/licenses/BSD-3-Clause)
- [Material Design Icons](https://material.io/tools/icons/)
   - License: [Apache License Version 2.0](https://www.apache.org/licenses/LICENSE-2.0)
   - The notification and launcher icons are remixes of the cloud icon
- [Font Awesome icons](https://fontawesome.com/)
   - License: Font Awesome Pro License, held by Daniel Wolf
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   - All icons used in Nebulo are also available under the [free license](https://fontawesome.com/license/free). Attribution is required if you don't hold a pro license (Nebulo does so in the credits)
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- [Weblate](https://weblate.org) for managing translations
   - License: GPLv3
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- [FABProgressCircle](https://github.com/JorgeCastilloPrz/FABProgressCircle) for showing a loading indicator around floating action buttons
   - License: [Apache License Version 2.0](https://www.apache.org/licenses/LICENSE-2.0)
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- [LeakCanary](https://github.com/square/leakcanary) for finding memory leaks
   - License:[Apache License Version 2.0](https://www.apache.org/licenses/LICENSE-2.0)
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- [LeakSentry](https://github.com/square/leakcanary/tree/master/leakcanary-leaksentry) for finding memory leaks
   - License:[Apache License Version 2.0](https://www.apache.org/licenses/LICENSE-2.0)
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- [Gson](https://github.com/google/gson)
   - License:[Apache License Version 2.0](https://www.apache.org/licenses/LICENSE-2.0)
- [OkHttp](https://github.com/square/okhttp)
   - License:[Apache License Version 2.0](https://www.apache.org/licenses/LICENSE-2.0)
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# Cloning
Feel free to clone this software. However, there are a few things to notice:
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- This app uses some of my own libraries. Those are OSS as well, you can find the URLs in the `build.gradle`.
   - These libraries are distributed as pre-built binaries using an Nexus3 server. Public credentials are contained in the root `build.gradle`
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   - Alternatively, replace the dependencies (`implementation 'com.frostnerd.utilskt:....`) with git sub-modules (`implementation project(...)`) after cloning the libraries.
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- Nebulo uses icons from Font Awesome covered under their free license. Nebulo gives attribution in the Credits section.