#!/bin/bash

INTERFACE=$(ip route show default | awk '/default/ {print $5}')

if [ -z "$INTERFACE" ]; then
    echo "Chyba: Výchozí síťová cesta nenalezena (síť je nedostupná)." >&2
    exit 1
fi

MAC_ADDR=$(cat "/sys/class/net/$INTERFACE/address" 2>/dev/null)

if [ -z "$MAC_ADDR" ]; then
    exit 1
fi

TEMP_MAC_DIGITS=$(echo "$MAC_ADDR" | grep -o '[0-9]' | tail -n 4 | tr -d '\n')

PORT="5${TEMP_MAC_DIGITS}"
PORTSSH=$(($PORT + 1))

# Spustime hlavni prikaz SSH tunelu s dynamicky generovanym portem
/usr/bin/ssh -f -NT -p 22222 \
                  -R localhost:${PORT}:localhost:5900 \
                  -R localhost:${PORTSSH}:localhost:22 \
                  -o StrictHostKeyChecking=no \
                  -o ServerAliveInterval=5 -o ServerAliveCountMax=3 \
                  sshmapper@176.74.132.13 -i /root/.ssh/id_rsa_tunnel