Implement iptables rule parser and natural language explainer

[Copilot]

Adds an automated agent to parse and explain iptables firewall rules in human-readable format.

Architecture

Three core modules with single responsibilities:

• Parser (parser.py): Parses both iptables-save and iptables -L output formats into structured objects
• Explainer (explainer.py): Converts rule components (chains, targets, protocols, ports, IPs, states) into natural language
• Agent (agent.py): Orchestrates parsing and explanation, supports system/file/string input with filtering by chain or target

CLI Interface

# From system (requires sudo)
sudo iptables-agent

# From file with filtering
iptables-agent --file rules.txt --chain INPUT --format json

Library Usage

from iptables_agent import IPTablesAgent

agent = IPTablesAgent()
agent.load_rules_from_file('iptables-save.txt')

# Get explanations
print(agent.explain_all_rules_formatted())

# Filter and explain
for rule in agent.filter_rules_by_chain('INPUT'):
    print(agent.explain_rule(rule))

Example Output

Input:

-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT

Output:

For incoming traffic: allow TCP traffic to port 22 with state NEW

Zero external dependencies. Installable via pip install -e . with CLI command iptables-agent.

Original prompt

Automatic agent code to explain the iptable rules with a system

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