A collection of scripts for manipulating network address data in CLI. Each command-line tool is designed to do one thing and do it well. This follows the Unix philosophy of "do one thing and do it well."
| Script Name | Synopsis |
|---|---|
| cidr2mask | Read prefixes in CIDR notation from STDIN and return them in prefix and subnet mask notation to STDOUT. |
| mask2cidr | Read prefixes in prefix and subnet mask notation from STDIN and returns them in CIDR notation to STDOUT. |
| summarize_cidrs | Read prefixes in CIDR notation from STDIN, summarize them to least common prefix length and returns the result in CIDR notation to STDOUT. |
- Clone the repository
git clone git@github.com:valentin-vasilev/netscripts.git $HOME/code
cd $HOME/code/netscripts- (Optional) Install dependencies
Addtional packages are required for development purposes only. All scripts are designed to work with the standard Python libraries.
python -m pip install - r requirements.txt- Make scripts executable
chmod +x $HOME/code/netscripts*- (Optional) Create a symlink to a directory in your $PATH so you can run the script from anywhere.
sudo ln -s $HOME/code/netscripts/app/cidr2mask.py /usr/local/bin/cidr2maskAll tools are designed to read from STDIN and write to STDOUT. This makes them suitable for creating pipelines and scripts.
Example 1: Summarize CIDRs and format conversion
We have a list of 3 prefixes (192.168.0.0/24, 192.168.1.0/24 and 192.168.2.0/24) in CIDR notation and we need to summarize them. Additionally, we need the result in prefix and subnet mask notation to use it in a firewall configuration.
echo "192.168.0.0/24\n192.168.2.0/24\n192.168.3.0/24" | summarize_cidrs | cidr2maskThis will result in the following output.
192.168.0.0 255.255.255.0
192.168.2.0 255.255.254.0The original list of prefixes in CIDR notation are first summarized using summarize_cidrs. The output of summarize_cidrs is again in CIDR notation, so we use cidr2mask to convert them to prefix and subnet mask notation.
👍 Pull requests are always welcome!