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#!/usr/bin/env bash
# Copyright (c) 2023 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "audit-scripts" project.
# For details, see https://github.com/egor-tensin/audit-scripts.
# Distributed under the MIT License.
set -o errexit -o nounset -o pipefail
shopt -s inherit_errexit lastpipe
script_name="$( basename -- "${BASH_SOURCE[0]}" )"
readonly script_name
check_tool() {
local tool
for tool; do
if ! command -v "$tool" > /dev/null; then
echo "$script_name: $tool is missing" >&2
exit 1
fi
done
}
print_usage() {
echo "usage: $script_name [-h] [-6] [-p PORT_RANGES] [-t TOP_N_PORTS] HOST"
}
exit_with_usage_error() {
local msg
for msg; do
echo "usage error: $msg" >&2
done
print_usage >&2
exit 1
}
host=
declare -a nmap_args=()
parse_args() {
local ports=
local top_ports=
local opt
while getopts ':h6p:t:' opt; do
case "$opt" in
h)
print_usage
exit 0
;;
6)
nmap_args+=('-6')
;;
p)
ports="$OPTARG"
;;
t)
top_ports="$OPTARG"
;;
:)
exit_with_usage_error "option -$OPTARG requires an argument"
;;
*)
exit_with_usage_error "option -$OPTARG is invalid"
;;
esac
done
shift "$((OPTIND - 1))"
if [ "$#" -ne 1 ]; then
exit_with_usage_error
fi
host="$1"
if [ -n "$ports" ] && [ -n "$top_ports" ]; then
exit_with_usage_error "you can't use both -p and -t options"
fi
if [ -z "$ports" ] && [ -z "$top_ports" ]; then
ports='-'
fi
if [ -n "$ports" ]; then
nmap_args+=('-p' "$ports")
fi
if [ -n "$top_ports" ]; then
nmap_args+=('--top-ports' "$top_ports")
fi
}
main() {
check_tool nmap xmlstarlet
parse_args "$@"
nmap -Pn ${nmap_args[@]+"${nmap_args[@]}"} -oX - -- "$host" | xmlstarlet sel -t -v '//port[state/@state="open"]/@portid' -nl
}
main "$@"
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