Iptables Check Before

iptables-check-before.sh, contains a function than checks for preexisting rule prior to taking action

The following covers how to install this branch as a submodule within your own project, and parameters that iptables-check-before.sh currently responds to.

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Table of Contents

• ⬆ Top of ReadMe File

• ⚡ Quick Start

  • 📝 Edit Your ReadMe File
  • 🐚 Example Usage
  • 💾 Commit and Push

• 📜 API

• ©️ License

---

Quick Start

Bash Variables

_module_https_url='https://github.com/network-utilities/iptables-check-before.git'
_module_relative_path='modules/iptables-check-before'

Git Commands

cd "<your-git-project-path>"

git checkout master
git submodule add -b master --name iptables-check-before "${_module_https_url}" "${_module_relative_path}"

Edit Your ReadMe File

Suggested additions so everyone has a good time with submodules

Clone with the following to avoid incomplete downloads


    git clone --recurse-submodules <url-for-your-project>


Update/upgrade submodules via


    git submodule update --init --recursive --merge

Example Usage

Example of sourcing and utilize iptables_check_before features

example-usage.sh

#!/usr/bin/env bash


## Find true directory this script resides in
__SOURCE__="${BASH_SOURCE[0]}"
while [[ -h "${__SOURCE__}" ]]; do
    __SOURCE__="$(find "${__SOURCE__}" -type l -ls | sed -n 's@^.* -> \(.*\)@\1@p')"
done
__DIR__="$(cd -P "$(dirname "${__SOURCE__}")" && pwd)"


## Source module code within this script
source "${__DIR__}/modules/iptables-check-before/iptables-check-before.sh"

iptables -N some_chain
iptables_check_before -A INPUT -j some_chain
iptables_check_before -A some_chain -p tcp --dport 80 -j ACCEPT
iptables_check_before -A some_chain -j RETURN

Test that things work!

Commit and Push

git add .gitmodules
git add modules/iptables-check-before
git add README.md


git commit -F- <<'EOF'
:heavy_plus_sign: Adds network-utilities/iptables-check-before#1 submodule


**Edits**


- `README.md` file, documentation updates for submodules


**Additions**

- `.gitmodules` file, tracks other Git repository code utilized by this project

- `modules/iptables-check-before` submodule, Git tracked dependency
EOF


git push origin master

🎉 Excellent 🎉 your repository is now ready to begin unitizing code from this project!

---

Iptables Check Before API

Checks if rules exist prior to appending or deleting

Param	Type		Description
$@	list	required	iptables rules to check prior to appending or deleting

Returns: boolean, exit status of appending or deleting iptables rules

Throws Parameter_Error: ipv4_range_from_address not provided any arguments, when arguments are not defined

Example:

iptables_check_before -A INPUT -j some_chain
#> iptables -C INPUT -j some_chain || iptables -A INPUT -j some_chain

---

License

Iptables Check Before submodule quick start documentation
Copyright (C) 2019  S0AndS0

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation; version 3 of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
by `jesin`
on