Implement public IP fetching in vpn-monitor script

Added a function to fetch and validate public IP addresses from multiple sources.

qbittorrent/rootfs/etc/cont-init.d/95-vpn-monitor.sh

@@ -5,4 +5,34 @@ set -euo pipefail
 if ! bashio::config.true 'openvpn_enabled' && ! bashio::config.true 'wireguard_enabled'; then
     # No VPN enabled: remove monitoring service to avoid unnecessary restarts
     rm -rf /etc/services.d/vpn-monitor
+    exit 0
 fi
+
+_fetch_public_ip() {
+    local resp
+    local url
+    local urls=(
+        "https://icanhazip.com"
+        "https://ifconfig.me/ip"
+        "https://api64.ipify.org"
+        "https://checkip.amazonaws.com"
+        "https://domains.google.com/checkip"
+        "https://ipinfo.io/ip"
+    )
+    local shuffled_urls
+    mapfile -t shuffled_urls < <(printf "%s\n" "${urls[@]}" | shuf)
+    # Loop through the now-randomized list
+    for url in "${shuffled_urls[@]}"; do
+        resp=$(curl -fsS --max-time 5 "${url}" 2>/dev/null || true)
+        resp="${resp//[[:space:]]/}"
+
+        # Validate IPv4 or IPv6
+        if [[ "${resp}" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]] || [[ "${resp}" =~ ^[0-9a-fA-F:]+$ ]]; then
+            printf '%s\n' "${resp}"
+            return 0
+        fi
+    done
+    return 1
+}
+
+echo "$(_fetch_public_ip || true)" > /currentip