jcoffey-dev
5d417f3c4c
The scripts were attributed to LINUXexpert.org, which is being retired as a site and is no longer where this work lives. Coffey Labs is the organisation these projects belong to. One line per script, fifteen of them, and nothing else. LICENSE is deliberately untouched: its "Copyright (C) <year> <name of author>" lines are GPL boilerplate showing you how to write your own notice, and the Free Software Foundation's own copyright on the licence text is not ours to edit. Both git contributors are the same person, so there is no third-party copyright here that could not be restated.
62 lines
2.2 KiB
Bash
62 lines
2.2 KiB
Bash
#!/bin/bash
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# network_info.sh - Show network interfaces, routes, open ports, firewall rules
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#
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# Copyright (C) 2025 Coffey Labs
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation, version 3 of the License.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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# for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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# Usage: network_info.sh (no arguments)
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# Description: Displays network interface addresses, routing table, open ports, and iptables rules.
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#
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# Read-only. The iptables section needs root; without it that section
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# reports the failure rather than silently showing nothing.
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set -euo pipefail
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echo "==== Network Interfaces (IP addresses) ===="
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if command -v ip &> /dev/null; then
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ip -brief addr show # brief output of interfaces and addresses
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elif command -v ifconfig &> /dev/null; then
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ifconfig -a
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else
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echo "No network interface tool (ip or ifconfig) available."
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fi
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echo -e "\n==== Routing Table ===="
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if command -v ip &> /dev/null; then
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ip route show
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elif command -v route &> /dev/null; then
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route -n
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else
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echo "No routing tool (ip or route) available."
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fi
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echo -e "\n==== Listening Ports (TCP/UDP) ===="
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if command -v ss &> /dev/null; then
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ss -tulwn # show TCP/UDP ports in listen state with numeric addresses
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elif command -v netstat &> /dev/null; then
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netstat -tuln
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else
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echo "No socket listing tool (ss or netstat) available."
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fi
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echo -e "\n==== Firewall Rules (iptables) ===="
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if command -v iptables &> /dev/null; then
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# Needs root; report the failure instead of letting set -e abort here.
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iptables -L -n -v || echo "Could not read iptables rules (run as root?)."
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elif command -v nft &> /dev/null; then
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nft list ruleset || echo "Could not read nftables ruleset (run as root?)."
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else
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echo "iptables command not found (no firewall rules to show or using nftables)."
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fi
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