#!/bin/bash
INTERFACE=$1
ACTION=$2
INTNIC=enp10s0
if [ "$INTERFACE" = "$INTNIC" ]; then
    case "$ACTION" in
        up)
            IP=$(ip -4 addr show dev "$INTERFACE" 2>/dev/null | grep -oP '(?<=inet\s)\d+(\.\d+){3}')
            if [ -n "$IP" ]; then
                sed -i -E "s/^#?ListenAddress [0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/ListenAddress $IP/" /etc/ssh/sshd_config
                systemctl restart sshd
            fi
            ;;
        down)
            systemctl stop sshd
            sed -i -E "s/^#?ListenAddress [0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/ListenAddress 127.0.0.1/" /etc/ssh/sshd_config
            ;;
    esac
fi