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https://github.com/allape/openkvm
DIY KVM for remote-controlling a computer even in BIOS
https://github.com/allape/openkvm
esp32s3 golang hdmi-recording keyboard kvm mouse opencv remote-control rfc6143 vnc
Last synced: about 1 month ago
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DIY KVM for remote-controlling a computer even in BIOS
- Host: GitHub
- URL: https://github.com/allape/openkvm
- Owner: allape
- License: mit
- Created: 2024-05-07T12:23:34.000Z (6 months ago)
- Default Branch: main
- Last Pushed: 2024-09-19T06:43:04.000Z (about 2 months ago)
- Last Synced: 2024-09-29T18:42:53.024Z (about 2 months ago)
- Topics: esp32s3, golang, hdmi-recording, keyboard, kvm, mouse, opencv, remote-control, rfc6143, vnc
- Language: C++
- Homepage:
- Size: 614 KB
- Stars: 7
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# OpenKVM
DIY KVM device for remote-controlling a computer. `KVM` stands for `Keyboard & Video & Mouse`.
A side system on a rackmount server,
[`IPMI`](https://en.wikipedia.org/wiki/Intelligent_Platform_Management_Interface) in `Dell Server` for example.
Unlike an [IP-KVM](https://github.com/tiny-pilot/tinypilot), this project
respects [VNC protocol](https://datatracker.ietf.org/doc/html/rfc6143).
Just like the [MIT license](./LICENSE) says, no warranty or guarantee.
**And do _NOT_ use for any illegal purposes.**
### TODO
- [ ] Installation script
- [ ] Register as a system service
- [ ] Start on boot
- [ ] VNC authentication
- DES encryption in Golang can NOT directly apply
to [`VNC Authentication`](https://datatracker.ietf.org/doc/html/rfc6143#section-7.1.2)
- [ ] More effective to calculate the difference between frames
- Balance between the power of SBC and the network efficiency
- Or achieve more support for noVNC, beyond [rfc6143](https://datatracker.ietf.org/doc/html/rfc6143)
- [ ] Device filter for USB devices: for multiple device controlling
- [ ] OTG as keyboard and mouse, see
Linux [USB Gadget API](https://www.kernel.org/doc/html/v4.16/driver-api/usb/gadget.html)
- [ ] Using a single command to get the frame for `Video`, like
```shell
v4l2-ctl --device=/dev/video0 --stream-mmap --stream-count=1 --stream-to=- --set-fmt-video="width=640,height=480,pixelformat=MJPG"
```
## Dev Environment
### Hardware
**_NONE_ of them is sponsored, use them at your own risk!**
Essential hardware are:
- A computer that can run [Golang](https://go.dev/)
- An old computer
- SBC
- [RaspberryPi](https://www.raspberrypi.com/)
- [OrangePi](https://www.orangepi.org/)
- [BTT-Pi](https://bigtree-tech.com/blogs/news/new-release-bigtreetech-btt-pi)
- etc...
- Maybe an Android phone?
- `HDMI Recorder`
- ~~The common seen `HDMI Recorder` is a `USB 3.0` device.
There is only blank data from the `HDMI Recorder` on a `USB 2.0` port.
It seems that this is the problem of the `HDMI Recorder` itself,
the `HDMI Recorder` I bought can NOT work on Linux (Debian ARM or Ubuntu 24.04) even with a `USB 3.0` port.
Then, on the selection of SBC, beware of the support of `USB 3.0`.~~
- This should be the problem with HDMI recorder itself of the driver in Linux,
I am lack of the knowledge of the driver in Linux, but I might find a solution for it:
```shell
# Display all USB device, make sure the HDMI recorder is in 480M or above
lsusb -t
# /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
# |__ Port 1: Dev 3, If 0, Class=Video, Driver=uvcvideo, 480M
# |__ Port 1: Dev 3, If 1, Class=Video, Driver=uvcvideo, 480M
# |__ Port 1: Dev 3, If 2, Class=Audio, Driver=snd-usb-audio, 480M
# |__ Port 1: Dev 3, If 3, Class=Audio, Driver=snd-usb-audio, 480M
# Get the id of the USB device
lsusb
# Bus 001 Device 003: ID 1de1:f105 Actions Microelectronics Co. Hagibis
# Reset the USB device
# Replace this with the id or the name of your USB device.
# For me, this is `Hagibis` or `1de1:f105`
usbreset Hagibis
# Capture one frame from device
v4l2-ctl --verbose \
--device=/dev/video0 \
--stream-mmap \
--stream-count=1 \
--stream-to=frame.jpg \
--set-fmt-video="width=640,height=480,pixelformat=MJPG"
# BUT! But, in size of 1920x1080, frame will be corrupted
# Without resetting the USB device, there will be some error message in `dmesg` command
# Non-zero status (-71) in video completion handler.
# Here are some helpful commands
# List all video devices
v4l2-ctl --list-devices
# List all supported formats for a video device
v4l2-ctl --list-formats -d [device name or path or index] # v4l2-ctl --list-formats -d 0
# List all supported frame sizes
v4l2-ctl --list-framesizes [pixel format] -d [device] # v4l2-ctl --list-framesizes MJPEG -d 0
```
- Or a `webcam` with an always-on monitor.
- I know...this is a stupid way -- pointing a camera to a screen.
- Keyboard & Mouse Emulator
- ESP32-S3
- ESP32-S2
- Arduino?
- Some other device that supports USB HID output.
- HID over BLE is not recommended, because it may not work in BIOS.
- Relay and/or delayed relay
#### My Gears
- `SBC`: [OrangePi 3 LTS](http://www.orangepi.cn/html/hardWare/computerAndMicrocontrollers/details/Orange-Pi-3-LTS.html)
- `¥241 RMB` ≈ `$34 USD`
- `HDMI Recorder`: [hagibis UHC07](https://cn.hagibis.com/products-p00222p1.html)
- `¥69 RMB` ≈ `$10 USD`
- ⚠️ This device **ONLY** supports 1920x1080 and 3840x2160.
- `Keyboard & Mouse`: [ESP32-S3](https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/hw-reference/esp32s3/user-guide-devkitc-1.html)
- I bought a third-party one of [WeAct ESP32 S3 (A) DevKitC 1](https://github.com/WeActStudio).
- `¥52 RMB` ≈ `$7.5 USD`
- 5V relay * 2, 5V delayed relay * 1
- `¥15 RMB` ≈ `$2 USD`
#### Others
- Test Device:
- [RaspberryPi 2B](https://www.raspberrypi.com/products/raspberry-pi-2-model-b/)
- A Windows computer
- Ubuntu 24.04 x86_64
- Some SD cards.
- Some `USB Type-C2C/C2A` cables.
- A `HDMI` cable.
- Some power supplies.
It costs about `¥300 RMB` ≈ `40 USD`.
_**Price is for reference only, the actual price may vary.**_
### Software
- [GO](https://go.dev/)
- [OpenCV](https://opencv.org/)
- [PlatformIO](https://platformio.org/)
- [noVNC](https://github.com/novnc/noVNC)
## Diagram
[飞书文档, FeiShu Doc](https://qi58or3rjjg.feishu.cn/wiki/KTZewFOx9iRyzQkfdzTcu8linxc?from=from_copylink)
## Run
### Debian ARM64
1. Install GO dev kit
```shell
sudo apt-get update
sudo apt-get install -y wget curl ffmpeg v4l-utils
GO_ZIP="go1.22.3.linux-arm64.tar.gz"
wget "https://go.dev/dl/$GO_ZIP"
sudo rm -rf /usr/local/go && sudo tar -C /usr/local -xzf "$GO_ZIP"
```
2. Pull this repo
```shell
sudo apt-get update
sudo apt-get install -y git
git clone https://github.com/allape/openkvm.git
```
3. Install OpenCV
- Method 1: Install from APT
```shell
sudo apt-get update
sudo apt-get install -y build-essential g++ cmake pkg-config unzip libopencv-dev
# But in BTT-Pi, it is only up tp v4.5.1
# Then, I have to change the version of `gocv.io/x/gocv` to corresponding version
sed -i 's/gocv.io\/x\/gocv v0.36.1/gocv.io\/x\/gocv opencv-4.5.1/g' openkvm/go.mod
```
- Method 2: Build OpenCV from source
This may cost over 10 hours to build on BTT-Pi, I crashed at 96% :(
https://docs.opencv.org/4.x/d7/d9f/tutorial_linux_install.html
```shell
mkdir opencv4 && cd opencv4
wget -O opencv.zip https://github.com/opencv/opencv/archive/4.x.zip
unzip opencv.zip
mkdir -p build && cd build
cmake ../opencv-4.x
cmake --build .
```
4. Get noNVC
```shell
git clone --depth 1 https://github.com/novnc/noVNC.git
# [Optional] You can run noVNC separately
python3 -m http.server --directory noVNC/ 8081
```
5. Flash ESP32-S3
- ~~[PIO](https://platformio.org/): Espressif has dropped the support for PIO in ESP-IDF v5.x. See git log to
retrieve the code.~~
- Open folder [km/esp32s3](./km/esp32s3) of this project in [VSCode](https://code.visualstudio.com/)
- After installing [PlatformIO](https://marketplace.visualstudio.com/items?itemName=platformio.platformio-ide)
extension
- Go to `PlatformIO` Tab
- `PROJECT TASKS` -> `Default` -> `General` -> `Upload`
- Or open `command palette` and type `PlatformIO: Upload`
- `⌘ + shift + p` on macOS to open command palette
- `ctrl + shift + p` on Windows or Ubuntu
- [Arduino](https://www.arduino.cc/)
- Open `Perferences` -> `Additional Board Manager URLs` ->
Add `https://espressif.github.io/arduino-esp32/package_esp32_dev_index.json`
- Click [HERE](https://docs.espressif.com/projects/arduino-esp32/en/latest/installing.html#installing-using-arduino-ide) for more details
- Open [km/esp32s3-arduino/main/main.ino](./km/esp32s3-arduino/main/main.ino)
with [Arduino IDE](https://github.com/arduino/arduino-ide)
- Select board `ESP32S3 Dev Module` and corresponding port
- Click `Upload`
6. Run or build repo
```shell
cd openkvm
cp kvm.toml.tpl kvm.toml
# Find out serial port
dmesg | grep tty
# Edit this file to apply your settings
vim kvm.toml
# Should run with super user privilege
sudo go run .
```
7. Open browser and go to http://ip:8080/vnc.html, then click `Connect`
- Hostname and port may vary depending on your settings
# Credits
- [Listed in go.mod](./go.mod)
- [Roboto Font](https://fonts.google.com/specimen/Roboto/about)
- [noVNC](https://github.com/novnc/noVNC)
- [PlatformIO](https://platformio.org/)
- [ESP-IDF](https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/get-started/index.html)
- [ESP32-Arduino](https://docs.espressif.com/projects/arduino-esp32/en/latest/getting_started.html)
- [Raspberry Pi Imager](https://www.raspberrypi.com/software/)
- [KeyMap](https://github.com/qemu/keycodemapdb)