Initial commit

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# Project specific ignores
+regionInfo.dat

main.py

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+from sys import argv
+
+SERVER_SUFFIX = "-Master-1"
+
+def gen_file(region_name: str, ip_address: str = "127.0.0.1", port: int = 22023):
+    if (len(region_name) + len(SERVER_SUFFIX) > 0xff):
+        raise ValueError("Region name too long")
+    if (len(ip_address) > 0xff):
+        raise ValueError("IP-address too long")
+    if (port > 0xffff * 5):
+        raise ValueError("Port too high")
+
+    # Append region name
+    data = bytearray([0x00] * 4 + [len(region_name)])
+    data += region_name.encode("ascii")
+    
+    # Append ip address
+    data.extend([len(ip_address)])
+    data += ip_address.encode("ascii")
+    data.extend([0x01] + [0x00] * 3)
+    
+    # Append server name
+    server_name = region_name + SERVER_SUFFIX
+    data.extend([len(server_name)])
+    data += server_name.encode("ascii")
+    
+    # Append ip address in byte form
+    ip_address_bytes = bytearray()
+    for value in ip_address.split("."):
+        ip_address_bytes.extend([int(value)])
+    data += ip_address_bytes
+    data.extend([port & 0xff, (port & 0xff00) >> 8])
+    data.extend([0x00] * 4)
+
+    print(data)
+    return data
+
+"""
+Creates and writes the among us regionInfo.dat file
+Example:
+```py
+try:
+    writeFile("Example server", "169.0.0.1", port=12345))
+    print("Success!")
+except Exception as error:
+    print(error)
+```
+"""
+def write_file(region_name: str, ip_address: str = "127.0.0.1", file_name: str = "regionInfo.dat", port: int = 22023):
+    data = gen_file(region_name, ip_address, port)
+    with open(file_name, "wb") as file:
+        file.write(data)
+
+if __name__ == "__main__":
+    print(f"Creating file using {argv[1:]}")
+    write_file(*argv[1:])