This project came to existence mainly because Android is broken. Blame Google for that.

Unicaster mDNS is an application which can receive DNS queries and depending on the suffix domain:

• intercept them and solve them statically,
• query the multicast DNS (mDNS) for the service,
• query an upstream server

The purpose is mainly allowing Android to resolve mDNS queries by configuring this application as the network's DNS, while still resolving outside queries by the upstream.

The current work is not compliant with some queries, such as ANY for the static services and no logic is implemented to handle it in mDNS.

Currently only the IPv4 multicast address is queried. Although most parts of the code are ready to work with the IPv6 multicast address, no logic is implemented for choosing protocol.

Multicast DNS works very similarly to DNS, but the queries happen in the IN-mDNS class instead of in the IN class. Also, queries are sent to the Multicast IP 224.0.0.251 (ff02::fb in IPv6).

This service changes the returned classes so that the client will think the answer originated in the IN class. Other fields are returned unchanged.

Contributions are welcome. Please send a pull request via GitHub or reach out directly via email using git request-pull.

By making a contribution to this project you certify in good faith that you meet the Developer's Certificate of Origin 1.1 as written by the Linux Foundation, that is also available in this repo.

Unicaster mDNS - Copyright © 2018 Santiago Saavedra

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see https://www.gnu.org/licenses/.