It's a primitive webserver basically consisting of a single shell script and an image folder. The images are not included in the source tree. To prevent bots from ruining the site a separate entrance server with a CAPTCHA challenge is also made, and the two share a lot of code making the "single shell script" really be three scripts (plus configuration files).
Please regard this code as a joke or work of art or both. Because it can only serve one request at a time you can make a DOS attack against it just by facing against its location and yell ... okay, maybe a little more effort than that but not much.
See the Bubula² Flumen page for details.
- flumen-common.inc.sh: Common library for the server scripts.
- flumen-entrance-server.sh: Entrance server.
- flumen-server.sh: The Bubula² Flumen server!
- flumen.service: Service file for starting the server process.
- flumen-entrance.service: Service file for starting the entrance server.
- shutdown.service: Service that shuts down the host.
- shutdown-after-flumen.timer: Timer to ensure that the Raspberry Pi is shut down one hour after startup, i.e., before the timer cuts the power.
- entrance-log.sh: Tool for reading the entrance server log.
- flumen-log.sh: Tool for reading the main server log.
- copy-to-rpi.sh: Tool for copying single files to the host lacking scp or rsync etc.
- README.md: huh?
- setup-rpi.sh: Install and update script.
- update-images.sh: Generate and upload images from sources.
The following configuration files are not included in the repository and must be created to use some of the scripts.
The script is intended to run on a Raspberry Pi with a small memory card. This is the reason for the homemade scp- and rsync-like deployment scripts.
The main server is based on nc (netcat) and will run through the images in the folder img once and finally show a static page. It is thus intended to run on a server that is only running for short periods of time.
It will keep track of IP-adresses and time of visit to force a delay on when the same IP is allowed to view a new image.
If running as root it will mount a ramfs filesystem on the folder used for temporary files. Images are preloaded by saving the base64 value in the temporary folder, thus avoiding reading from the SD card while running if a RAM disk is mounted.
Using nc also means that it can only serve one request at a time, making the server appear to be down while serving a request. The entrance server is therefore based on socat instead of nc to avoid bots making the server unresponsive. The code allow socat to be replaced by nc and vice versa by changing a single variable, but the nc code is not discarded because part of the concept is that the main server is an impractical hack.
Copyright (c) 2019 Daniel Lundsgaard Skovenborg firstname.lastname@example.org
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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