HoRNDIS(the USB tethering driver for Mac OS X)
HoRNDIS (pronounce: "horrendous") is a driver for Mac OS X that allows you to use your Android phone's native USB tethering mode to get Internet access.
For more information, visit the home page for HoRNDIS on my site.
- Get the installation package (Download or Build the installation package from source yourself)
- Run the installation package
brew cask install horndis sudo kextload /Library/Extensions/HoRNDIS.kext
- Assuming that the installation proceeds without errors, after it completes, connect your phone to your Mac by USB.
- Enter the settings menu on your phone.
- In the connections section, below Wi-Fi and Bluetooth:
- Select "More..."
- Select "Tethering & portable hotspot"
- Check the "USB tethering" box. It should flash once, and then become solidly checked.
- Delete the
- Restart your computer
Building the source
git clonethe repository
- Simply running xcodebuild in the checkout directory should be sufficient to build the kext.
- If you wish to package it up, you can run
maketo assemble the package in the build/ directory
Debugging and Development Notes
This sections contains tips and tricks for developing and debugging the driver.
USB Device Information
Mac OS System Menu -> About This Mac -> System Report --> Hardware/USB
Lists all USB devices that OS recognizes. Unfortunately, it does not give USB descriptors.
It prints USB configuration, such as interface and endpoint descriptors. You can print it for all devices or limit the output to specific ones. In order to run this command, you need to install usbutils.
- Homebrew users:
brew install mikhailai/misc/usbutils
Please do not install lsusb package from Homebrew Core, it's a different utility with the same name.
- Macports users:
sudo port install usbutils
ioreg -l -r -c IOUSBHostDevice
This command lists all the Mac OS IO Registry information under all USB devices. Unlike lsusb, ioreg tells how Mac OS recognized USB devices and interfaces, and how it matched drivers to these interfaces. The
-r -c IOUSBHostDevice limits the output to USB devices; to get complete OS registry, please run
LOG(....) statements, sprinkled throughout the HoRNDIS code, call the
IOLog functions. On Mac OS El Capitan (10.11) and earlier, the log messages go into
/var/log/system.log. Starting from Sierra (10.12), these messages are no longer written to
system.log and instead can be viewed via:
- GUI, using Console application, located in Utilities folder. You need to enter
process:kernelin the search box in order to filter the relevant messages.
- Command Line, using the
logcommand. For example:
log show --predicate process==\"kernel\" --start "2018-12-11 22:54:00"
The start value needs to be several minutes in the past, so it would not flood the console. Here is a convenient command that prints the messages from the past 3 mintes:
log show --predicate process==\"kernel\" --start "$(date -v-3M +'%F %T')"
I've observed that Mac OS logging is unreliable (especially in Sierra). In some cases, the messages may come out garbled (looking like bad multi-threaded code). In other cases, either GUI or Command Line may be missing messages that were emitted. Sometimes, reloading the driver may fix the problem.