An open Apple AirDrop implementation written in Python
OpenDrop is a command-line tool that allows sharing files between devices directly over Wi-Fi. Its unique feature is that it is protocol-compatible with Apple AirDrop which allows to share files with Apple devices running iOS and macOS. Currently (and probably also for the foreseeable future), OpenDrop only supports sending to Apple devices that are discoverable by everybody as the default contacts only mode requires Apple-signed certificates.
OpenDrop is experimental software and is the result of reverse engineering efforts by the Open Wireless Link project. Therefore, it does not support all features of AirDrop or might be incompatible with future AirDrop versions. OpenDrop is not affiliated with or endorsed by Apple Inc. Use this code at your own risk.
To achieve compatibility with Apple AirDrop, OpenDrop requires the target platform to support a specific Wi-Fi link layer. In addition, it requires Python >=3.6 as well as several libraries.
Apple Wireless Direct Link. As AirDrop exclusively runs over Apple Wireless Direct Link (AWDL), OpenDrop is only supported on macOS or on Linux systems running an open re-implementation of AWDL such as OWL.
bash brew install libarchive opensslOpenDrop automatically sets
DYLD_LIBRARY_PATHto look for the Homebrew versions. You may need to update the variable yourself if you install the libraries differently.
Linux distributions should ship with more up-to-date versions, so this won't be necessary.
Installation of the Python package release is straightforward using
pip3 install opendrop
You can also install the current development version by first cloning this repository, and then installing it via
git clone https://github.com/seemoo-lab/opendrop.git pip3 install ./opendrop
We briefly explain how to send and receive files using
opendrop. To see all command line options, run
Sending a file is typically a two-step procedure. You first discover devices in proximity using the
findcommand. Stop the process once you have found the receiver.
$ opendrop find Looking for receivers. Press enter to stop ... Found index 0 ID eccb2f2dcfe7 name John’s iPhone Found index 1 ID e63138ac6ba8 name Jane’s MacBook ProYou can then
senda file using
$ opendrop send -r 0 -f /path/to/some/file Asking receiver to accept ... Receiver accepted Uploading file ... Uploading has been successfulInstead of the
index, you can also use
name. OpenDrop will try to interpret the input in the order (1)
ID, and (3)
nameand fail if no match was found.
Receiving is much easier. Simply use the
receivecommand. OpenDrop will accept all incoming files automatically and put received files in the current directory.
$ opendrop receive
OpenDrop is the result of a research project and, thus, has several limitations (non-exhaustive list below). I do not have the capacity to work on them myself but am happy to provide assistance if somebody else want to take them on.
Triggering macOS/iOS receivers via Bluetooth Low Energy. Apple devices start their AWDL interface and AirDrop server only after receiving a custom advertisement via Bluetooth LE (see USENIX paper for details). This means, that Apple AirDrop receivers may not be discovered even if they are discoverable by everyone.
Sender/Receiver authentication and connection state. Currently, there is no peer authentication as in Apple's AirDrop, in particular, (1) OpenDrop does not verify that the TLS certificate is signed by Apple's root and (2) that the Apple ID validation record is correct (see USENIX paper for details). In addition, OpenDrop automatically accepts any file that it receives due to a missing connection state.
Sending multiple files. Apple AirDrop supports sending multiple files at once, OpenDrop does not (would require adding more files to the archive, modify HTTP /Ask request, etc.).
OpenDrop is licensed under the GNU General Public License v3.0.