fix(vm): validate MAC address input - require XX:XX:XX:XX:XX:XX format, re-ask on invalid

Add robust RAM input validation to multiple VM helper scripts (debian, docker, haos, openwrt, opnsense, pimox-haos, truenas). Each RAM prompt is now wrapped in a while loop that: provides a sensible default when the input is empty, ensures the value is a positive integer via regex, shows an "INVALID INPUT" whiptail message on bad input, and exits cleanly when the user cancels. Also fixed quoting of variable tests and normalized echoing of the allocated RAM. The pimox change preserves exit-status handling while integrating the same validation loop.

CHANGELOG.md

@@ -423,8 +423,28 @@ Exercise vigilance regarding copycat or coat-tailing sites that seek to exploit
 
 </details>
 
+## 2026-03-16
+
+### 🚀 Updated Scripts
+
+  - #### 🐞 Bug Fixes
+
+    - Tautulli: add setuptools<81 constraint to update script [@MickLesk](https://github.com/MickLesk) ([#12959](https://github.com/community-scripts/ProxmoxVE/pull/12959))
+    - Seerr: add missing build deps [@MickLesk](https://github.com/MickLesk) ([#12960](https://github.com/community-scripts/ProxmoxVE/pull/12960))
+    - fix: yubal update [@CrazyWolf13](https://github.com/CrazyWolf13) ([#12961](https://github.com/community-scripts/ProxmoxVE/pull/12961))
+
+### 💾 Core
+
+  - #### 🐞 Bug Fixes
+
+    - hwaccel: remove ROCm install from AMD APU setup [@MickLesk](https://github.com/MickLesk) ([#12958](https://github.com/community-scripts/ProxmoxVE/pull/12958))
+
 ## 2026-03-15
 
+### 🆕 New Scripts
+
+  - Yamtrack ([#12936](https://github.com/community-scripts/ProxmoxVE/pull/12936))
+
 ### 🚀 Updated Scripts
 
   - #### 🐞 Bug Fixes
@@ -445,6 +465,10 @@ Exercise vigilance regarding copycat or coat-tailing sites that seek to exploit
 
     - core: retry downloads with exponential backoff [@MickLesk](https://github.com/MickLesk) ([#12896](https://github.com/community-scripts/ProxmoxVE/pull/12896))
 
+### ❔ Uncategorized
+
+  - [go2rtc] Add ffmpeg dependency to install script [@Copilot](https://github.com/Copilot) ([#12944](https://github.com/community-scripts/ProxmoxVE/pull/12944))
+
 ## 2026-03-14
 
 ### 🚀 Updated Scripts

ct/headers/yamtrack

@@ -0,0 +1,6 @@
+__  __                __                  __  
+\ \/ /___ _____ ___  / /__________ ______/ /__
+ \  / __ `/ __ `__ \/ __/ ___/ __ `/ ___/ //_/
+ / / /_/ / / / / / / /_/ /  / /_/ / /__/ ,<   
+/_/\__,_/_/ /_/ /_/\__/_/   \__,_/\___/_/|_|  
+                                              

ct/immich.sh

@@ -133,9 +133,7 @@ EOF
       $STD sudo -u postgres psql -d immich -c "REINDEX INDEX face_index;"
       $STD sudo -u postgres psql -d immich -c "REINDEX INDEX clip_index;"
     fi
-    ensure_dependencies ccache gcc-13 g++-13
+    ensure_dependencies ccache
-    export CC=gcc-13
-    export CXX=g++-13
 
     INSTALL_DIR="/opt/${APP}"
     UPLOAD_DIR="$(sed -n '/^IMMICH_MEDIA_LOCATION/s/[^=]*=//p' /opt/immich/.env)"
@@ -220,28 +218,14 @@ EOF
     chown immich:immich ./uv.lock
     export VIRTUAL_ENV="${ML_DIR}"/ml-venv
     if [[ -f ~/.openvino ]]; then
-      ML_PYTHON="python3.13"
-      msg_info "Pre-installing Python ${ML_PYTHON} for machine-learning"
-      for attempt in $(seq 1 3); do
-        $STD sudo --preserve-env=VIRTUAL_ENV -nu immich uv python install "${ML_PYTHON}" && break
-        [[ $attempt -lt 3 ]] && msg_warn "Python download attempt $attempt failed, retrying..." && sleep 5
-      done
-      msg_ok "Pre-installed Python ${ML_PYTHON}"
       msg_info "Updating HW-accelerated machine-learning"
-      $STD uv add --no-sync --optional openvino onnxruntime-openvino==1.24.1 --active -n -p "${ML_PYTHON}" --managed-python
+      $STD uv add --no-sync --optional openvino onnxruntime-openvino==1.24.1 --active -n -p python3.13 --managed-python
-      $STD sudo --preserve-env=VIRTUAL_ENV -nu immich uv sync --extra openvino --no-dev --active --link-mode copy -n -p "${ML_PYTHON}" --managed-python
+      $STD sudo --preserve-env=VIRTUAL_ENV -nu immich uv sync --extra openvino --no-dev --active --link-mode copy -n -p python3.13 --managed-python
       patchelf --clear-execstack "${VIRTUAL_ENV}/lib/python3.13/site-packages/onnxruntime/capi/onnxruntime_pybind11_state.cpython-313-x86_64-linux-gnu.so"
       msg_ok "Updated HW-accelerated machine-learning"
     else
-      ML_PYTHON="python3.11"
-      msg_info "Pre-installing Python ${ML_PYTHON} for machine-learning"
-      for attempt in $(seq 1 3); do
-        $STD sudo --preserve-env=VIRTUAL_ENV -nu immich uv python install "${ML_PYTHON}" && break
-        [[ $attempt -lt 3 ]] && msg_warn "Python download attempt $attempt failed, retrying..." && sleep 5
-      done
-      msg_ok "Pre-installed Python ${ML_PYTHON}"
       msg_info "Updating machine-learning"
-      $STD sudo --preserve-env=VIRTUAL_ENV -nu immich uv sync --extra cpu --no-dev --active --link-mode copy -n -p "${ML_PYTHON}" --managed-python
+      $STD sudo --preserve-env=VIRTUAL_ENV -nu immich uv sync --extra cpu --no-dev --active --link-mode copy -n -p python3.11 --managed-python
       msg_ok "Updated machine-learning"
     fi
     cd "$SRC_DIR"

ct/seerr.sh

@@ -128,6 +128,8 @@ EOF
 
     CLEAN_INSTALL=1 fetch_and_deploy_gh_release "seerr" "seerr-team/seerr" "tarball"
 
+    ensure_dependencies build-essential python3-setuptools
+
     msg_info "Updating PNPM Version"
     pnpm_desired=$(grep -Po '"pnpm":\s*"\K[^"]+' /opt/seerr/package.json)
     NODE_VERSION="22" NODE_MODULE="pnpm@$pnpm_desired" setup_nodejs

ct/sparkyfitness.sh

@@ -79,7 +79,7 @@ function update_script() {
 
   [Install]
   WantedBy=multi-user.target
-  EOF
+EOF
     systemctl daemon-reload
     msg_ok "Refreshed SparkyFitness Service"
 

ct/tautulli.sh

@@ -51,6 +51,7 @@ function update_script() {
     $STD source /opt/Tautulli/.venv/bin/activate
     $STD uv pip install -r requirements.txt
     $STD uv pip install pyopenssl
+    $STD uv pip install "setuptools<81"
     msg_ok "Updated Tautulli"
 
     msg_info "Restoring config and database"

ct/yamtrack.sh

@@ -0,0 +1,83 @@
+#!/usr/bin/env bash
+source <(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/build.func)
+
+# Copyright (c) 2021-2026 community-scripts ORG
+# Author: MickLesk (CanbiZ)
+# License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
+# Source: https://github.com/FuzzyGrim/Yamtrack
+
+APP="Yamtrack"
+var_tags="${var_tags:-media;tracker;movies;anime}"
+var_cpu="${var_cpu:-2}"
+var_ram="${var_ram:-2048}"
+var_disk="${var_disk:-8}"
+var_os="${var_os:-debian}"
+var_version="${var_version:-13}"
+var_unprivileged="${var_unprivileged:-1}"
+
+header_info "$APP"
+variables
+color
+catch_errors
+
+function update_script() {
+  header_info
+  check_container_storage
+  check_container_resources
+
+  if [[ ! -d /opt/yamtrack ]]; then
+    msg_error "No ${APP} Installation Found!"
+    exit
+  fi
+
+  if check_for_gh_release "yamtrack" "FuzzyGrim/Yamtrack"; then
+    msg_info "Stopping Services"
+    systemctl stop yamtrack yamtrack-celery
+    msg_ok "Stopped Services"
+
+    msg_info "Backing up Data"
+    cp /opt/yamtrack/src/.env /opt/yamtrack_env.bak
+    msg_ok "Backed up Data"
+
+    CLEAN_INSTALL=1 fetch_and_deploy_gh_release "yamtrack" "FuzzyGrim/Yamtrack" "tarball"
+
+    msg_info "Installing Python Dependencies"
+    cd /opt/yamtrack
+    $STD uv venv .venv
+    $STD uv pip install --no-cache-dir -r requirements.txt
+    msg_ok "Installed Python Dependencies"
+
+    msg_info "Restoring Data"
+    cp /opt/yamtrack_env.bak /opt/yamtrack/src/.env
+    rm -f /opt/yamtrack_env.bak
+    msg_ok "Restored Data"
+
+    msg_info "Updating Yamtrack"
+    cd /opt/yamtrack/src
+    $STD /opt/yamtrack/.venv/bin/python manage.py migrate
+    $STD /opt/yamtrack/.venv/bin/python manage.py collectstatic --noinput
+    msg_ok "Updated Yamtrack"
+
+    msg_info "Updating Nginx Configuration"
+    cp /opt/yamtrack/nginx.conf /etc/nginx/nginx.conf
+    sed -i 's|user abc;|user www-data;|' /etc/nginx/nginx.conf
+    sed -i 's|/yamtrack/staticfiles/|/opt/yamtrack/src/staticfiles/|' /etc/nginx/nginx.conf
+    $STD systemctl reload nginx
+    msg_ok "Updated Nginx Configuration"
+
+    msg_info "Starting Services"
+    systemctl start yamtrack yamtrack-celery
+    msg_ok "Started Services"
+    msg_ok "Updated successfully!"
+  fi
+  exit
+}
+
+start
+build_container
+description
+
+msg_ok "Completed Successfully!\n"
+echo -e "${CREATING}${GN}${APP} setup has been successfully initialized!${CL}"
+echo -e "${INFO}${YW} Access it using the following URL:${CL}"
+echo -e "${TAB}${GATEWAY}${BGN}http://${IP}:8000${CL}"

ct/yubal.sh

@@ -47,7 +47,7 @@ function update_script() {
 
     msg_info "Installing Python Dependencies"
     cd /opt/yubal
-    $STD uv sync --no-dev --frozen
+    $STD uv sync --package yubal-api --no-dev --frozen
     msg_ok "Installed Python Dependencies"
 
     msg_info "Starting Services"

install/go2rtc-install.sh

@@ -14,6 +14,10 @@ network_check
 update_os
 setup_hwaccel
 
+msg_info "Installing Dependencies"
+$STD apt install -y ffmpeg
+msg_ok "Installed Dependencies"
+
 USE_ORIGINAL_FILENAME="true" fetch_and_deploy_gh_release "go2rtc" "AlexxIT/go2rtc" "singlefile" "latest" "/opt/go2rtc" "go2rtc_linux_amd64"
 
 msg_info "Creating Service"

install/immich-install.sh

@@ -154,12 +154,6 @@ sed -i "s/^#shared_preload.*/shared_preload_libraries = 'vchord.so'/" /etc/postg
 systemctl restart postgresql.service
 PG_DB_NAME="immich" PG_DB_USER="immich" PG_DB_GRANT_SUPERUSER="true" PG_DB_SKIP_ALTER_ROLE="true" setup_postgresql_db
 
-msg_info "Installing GCC-13 (workaround for GCC-14 ICE on Trixie)"
-$STD apt install -y gcc-13 g++-13
-export CC=gcc-13
-export CXX=g++-13
-msg_ok "Installed GCC-13"
-
 msg_warn "Compiling Custom Photo-processing Libraries (can take anywhere from 15min to 2h)"
 LD_LIBRARY_PATH=/usr/local/lib
 export LD_RUN_PATH=/usr/local/lib
@@ -347,28 +341,14 @@ $STD useradd -U -s /usr/sbin/nologin -r -M -d "$INSTALL_DIR" immich
 mkdir -p "$ML_DIR" && chown -R immich:immich "$INSTALL_DIR"
 export VIRTUAL_ENV="${ML_DIR}/ml-venv"
 if [[ -f ~/.openvino ]]; then
-  ML_PYTHON="python3.13"
-  msg_info "Pre-installing Python ${ML_PYTHON} for machine-learning"
-  for attempt in $(seq 1 3); do
-    $STD sudo --preserve-env=VIRTUAL_ENV -nu immich uv python install "${ML_PYTHON}" && break
-    [[ $attempt -lt 3 ]] && msg_warn "Python download attempt $attempt failed, retrying..." && sleep 5
-  done
-  msg_ok "Pre-installed Python ${ML_PYTHON}"
   msg_info "Installing HW-accelerated machine-learning"
-  $STD uv add --no-sync --optional openvino onnxruntime-openvino==1.24.1 --active -n -p "${ML_PYTHON}" --managed-python
+  $STD uv add --no-sync --optional openvino onnxruntime-openvino==1.24.1 --active -n -p python3.13 --managed-python
-  $STD sudo --preserve-env=VIRTUAL_ENV -nu immich uv sync --extra openvino --no-dev --active --link-mode copy -n -p "${ML_PYTHON}" --managed-python
+  $STD sudo --preserve-env=VIRTUAL_ENV -nu immich uv sync --extra openvino --no-dev --active --link-mode copy -n -p python3.13 --managed-python
   patchelf --clear-execstack "${VIRTUAL_ENV}/lib/python3.13/site-packages/onnxruntime/capi/onnxruntime_pybind11_state.cpython-313-x86_64-linux-gnu.so"
   msg_ok "Installed HW-accelerated machine-learning"
 else
-  ML_PYTHON="python3.11"
-  msg_info "Pre-installing Python ${ML_PYTHON} for machine-learning"
-  for attempt in $(seq 1 3); do
-    $STD sudo --preserve-env=VIRTUAL_ENV -nu immich uv python install "${ML_PYTHON}" && break
-    [[ $attempt -lt 3 ]] && msg_warn "Python download attempt $attempt failed, retrying..." && sleep 5
-  done
-  msg_ok "Pre-installed Python ${ML_PYTHON}"
   msg_info "Installing machine-learning"
-  $STD sudo --preserve-env=VIRTUAL_ENV -nu immich uv sync --extra cpu --no-dev --active --link-mode copy -n -p "${ML_PYTHON}" --managed-python
+  $STD sudo --preserve-env=VIRTUAL_ENV -nu immich uv sync --extra cpu --no-dev --active --link-mode copy -n -p python3.11 --managed-python
   msg_ok "Installed machine-learning"
 fi
 cd "$SRC_DIR"

install/seerr-install.sh

@@ -14,7 +14,9 @@ network_check
 update_os
 
 msg_info "Installing Dependencies"
-$STD apt-get install -y build-essential
+$STD apt install -y \
+  build-essential \
+  python3-setuptools
 msg_ok "Installed Dependencies"
 
 fetch_and_deploy_gh_release "seerr" "seerr-team/seerr" "tarball"

install/yamtrack-install.sh

@@ -0,0 +1,105 @@
+#!/usr/bin/env bash
+
+# Copyright (c) 2021-2026 community-scripts ORG
+# Author: MickLesk (CanbiZ)
+# License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
+# Source: https://github.com/FuzzyGrim/Yamtrack
+
+source /dev/stdin <<<"$FUNCTIONS_FILE_PATH"
+color
+verb_ip6
+catch_errors
+setting_up_container
+network_check
+update_os
+
+msg_info "Installing Dependencies"
+$STD apt install -y \
+  nginx \
+  redis-server
+msg_ok "Installed Dependencies"
+
+PG_VERSION="16" setup_postgresql
+PG_DB_NAME="yamtrack" PG_DB_USER="yamtrack" setup_postgresql_db
+PYTHON_VERSION="3.12" setup_uv
+
+fetch_and_deploy_gh_release "yamtrack" "FuzzyGrim/Yamtrack" "tarball"
+
+msg_info "Installing Python Dependencies"
+cd /opt/yamtrack
+$STD uv venv .venv
+$STD uv pip install --no-cache-dir -r requirements.txt
+msg_ok "Installed Python Dependencies"
+
+msg_info "Configuring Yamtrack"
+SECRET=$(openssl rand -hex 32)
+cat <<EOF >/opt/yamtrack/src/.env
+SECRET=${SECRET}
+DB_HOST=localhost
+DB_NAME=${PG_DB_NAME}
+DB_USER=${PG_DB_USER}
+DB_PASSWORD=${PG_DB_PASS}
+DB_PORT=5432
+REDIS_URL=redis://localhost:6379
+URLS=http://${LOCAL_IP}:8000
+EOF
+
+cd /opt/yamtrack/src
+$STD /opt/yamtrack/.venv/bin/python manage.py migrate
+$STD /opt/yamtrack/.venv/bin/python manage.py collectstatic --noinput
+msg_ok "Configured Yamtrack"
+
+msg_info "Configuring Nginx"
+rm -f /etc/nginx/sites-enabled/default /etc/nginx/sites-available/default
+cp /opt/yamtrack/nginx.conf /etc/nginx/nginx.conf
+sed -i 's|user abc;|user www-data;|' /etc/nginx/nginx.conf
+sed -i 's|pid /tmp/nginx.pid;|pid /run/nginx.pid;|' /etc/nginx/nginx.conf
+sed -i 's|/yamtrack/staticfiles/|/opt/yamtrack/src/staticfiles/|' /etc/nginx/nginx.conf
+sed -i 's|error_log /dev/stderr|error_log /var/log/nginx/error.log|' /etc/nginx/nginx.conf
+sed -i 's|access_log /dev/stdout|access_log /var/log/nginx/access.log|' /etc/nginx/nginx.conf
+$STD nginx -t
+systemctl enable -q nginx
+$STD systemctl restart nginx
+msg_ok "Configured Nginx"
+
+msg_info "Creating Services"
+cat <<EOF >/etc/systemd/system/yamtrack.service
+[Unit]
+Description=Yamtrack Gunicorn
+After=network.target postgresql.service redis-server.service
+Requires=postgresql.service redis-server.service
+
+[Service]
+Type=simple
+WorkingDirectory=/opt/yamtrack/src
+ExecStart=/opt/yamtrack/.venv/bin/gunicorn config.wsgi:application -b 127.0.0.1:8001 -w 2 --timeout 120
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+cat <<EOF >/etc/systemd/system/yamtrack-celery.service
+[Unit]
+Description=Yamtrack Celery Worker
+After=network.target postgresql.service redis-server.service yamtrack.service
+Requires=postgresql.service redis-server.service
+
+[Service]
+Type=simple
+WorkingDirectory=/opt/yamtrack/src
+ExecStart=/opt/yamtrack/.venv/bin/celery -A config worker --beat --scheduler django --loglevel INFO
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+systemctl enable -q --now redis-server yamtrack yamtrack-celery
+msg_ok "Created Services"
+
+motd_ssh
+customize
+cleanup_lxc

misc/tools.func

@@ -4629,9 +4629,6 @@ _setup_amd_apu() {
     $STD apt -y install firmware-amd-graphics 2>/dev/null || true
   fi
 
-  # ROCm compute stack (OpenCL + HIP) - also works for many APUs
-  _setup_rocm "$os_id" "$os_codename"
-
   msg_ok "AMD APU configured"
 }
 

vm/archlinux-vm.sh

@@ -310,7 +310,10 @@ function advanced_settings() {
       HN="arch-linux"
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     else
-      HN=$(echo "${VM_NAME,,}" | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     fi
   else
@@ -332,27 +335,31 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 2 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z "$CORE_COUNT" ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="2"; fi
-      CORE_COUNT="2"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
-    else
         echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 2)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 2048 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z "$RAM_SIZE" ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="2048"; fi
-      RAM_SIZE="2048"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
-    else
         echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 2048)." 8 58
     else
       exit-script
     fi
+  done
 
   if BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Bridge" 8 58 vmbr0 --title "BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
     if [ -z "$BRG" ]; then
@@ -365,43 +372,61 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address" 8 58 "$GEN_MAC" --title "MAC ADDRESS" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
       if [ -z "$MAC1" ]; then
         MAC="$GEN_MAC"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC${CL}"
-    else
+        break
+      fi
+      if [[ "$MAC1" =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]]; then
         MAC="$MAC1"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "Invalid MAC address format. Use XX:XX:XX:XX:XX:XX (e.g., AA:BB:CC:DD:EE:FF)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan(leave blank for default)" 8 58 --title "VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
       if [ -z "$VLAN1" ]; then
         VLAN1="Default"
         VLAN=""
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
-    else
+        break
+      fi
+      if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
         VLAN=",tag=$VLAN1"
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
       if [ -z "$MTU1" ]; then
         MTU1="Default"
         MTU=""
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
-    else
+        break
+      fi
+      if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
         MTU=",mtu=$MTU1"
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
   if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "START VIRTUAL MACHINE" --yesno "Start VM when completed?" 10 58); then
     echo -e "${GATEWAY}${BOLD}${DGN}Start VM when completed: ${BGN}yes${CL}"

vm/debian-13-vm.sh

@@ -325,7 +325,10 @@ function advanced_settings() {
       HN="debian"
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     else
-      HN=$(echo "${VM_NAME,,}" | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     fi
   else
@@ -347,27 +350,31 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 2 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z "$CORE_COUNT" ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="2"; fi
-      CORE_COUNT="2"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
-    else
         echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 2)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 2048 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z "$RAM_SIZE" ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="2048"; fi
-      RAM_SIZE="2048"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
-    else
         echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 2048)." 8 58
     else
       exit-script
     fi
+  done
 
   if BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Bridge" 8 58 vmbr0 --title "BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
     if [ -z "$BRG" ]; then
@@ -380,43 +387,61 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address" 8 58 "$GEN_MAC" --title "MAC ADDRESS" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
       if [ -z "$MAC1" ]; then
         MAC="$GEN_MAC"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC${CL}"
-    else
+        break
+      fi
+      if [[ "$MAC1" =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]]; then
         MAC="$MAC1"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "Invalid MAC address format. Use XX:XX:XX:XX:XX:XX (e.g., AA:BB:CC:DD:EE:FF)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan(leave blank for default)" 8 58 --title "VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
       if [ -z "$VLAN1" ]; then
         VLAN1="Default"
         VLAN=""
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
-    else
+        break
+      fi
+      if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
         VLAN=",tag=$VLAN1"
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
       if [ -z "$MTU1" ]; then
         MTU1="Default"
         MTU=""
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
-    else
+        break
+      fi
+      if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
         MTU=",mtu=$MTU1"
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
   select_cloud_init
 

vm/debian-vm.sh

@@ -315,7 +315,10 @@ function advanced_settings() {
       HN="debian"
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     else
-      HN=$(echo ${VM_NAME,,} | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     fi
   else
@@ -337,27 +340,31 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 2 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $CORE_COUNT ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="2"; fi
-      CORE_COUNT="2"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
-    else
         echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 2)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 2048 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $RAM_SIZE ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="2048"; fi
-      RAM_SIZE="2048"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
-    else
         echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 2048)." 8 58
     else
       exit-script
     fi
+  done
 
   if BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Bridge" 8 58 vmbr0 --title "BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
     if [ -z $BRG ]; then
@@ -370,43 +377,61 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address" 8 58 $GEN_MAC --title "MAC ADDRESS" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MAC1 ]; then
+      if [ -z "$MAC1" ]; then
         MAC="$GEN_MAC"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC${CL}"
-    else
+        break
+      fi
+      if [[ "$MAC1" =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]]; then
         MAC="$MAC1"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "Invalid MAC address format. Use XX:XX:XX:XX:XX:XX (e.g., AA:BB:CC:DD:EE:FF)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan(leave blank for default)" 8 58 --title "VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $VLAN1 ]; then
+      if [ -z "$VLAN1" ]; then
         VLAN1="Default"
         VLAN=""
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
-    else
+        break
+      fi
+      if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
         VLAN=",tag=$VLAN1"
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MTU1 ]; then
+      if [ -z "$MTU1" ]; then
         MTU1="Default"
         MTU=""
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
-    else
+        break
+      fi
+      if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
         MTU=",mtu=$MTU1"
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
   if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "CLOUD-INIT" --yesno "Configure the VM with Cloud-init?" --defaultno 10 58); then
     echo -e "${CLOUD}${BOLD}${DGN}Configure Cloud-init: ${BGN}yes${CL}"

vm/docker-vm.sh

@@ -251,7 +251,10 @@ function advanced_settings() {
     if [ -z $VM_NAME ]; then
       HN="docker"
     else
-      HN=$(echo ${VM_NAME,,} | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
     fi
     echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
   else
@@ -275,24 +278,32 @@ function advanced_settings() {
   fi
 
   # CPU Cores
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 2 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $CORE_COUNT ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="2"; fi
-      CORE_COUNT="2"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-    fi
         echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
+        break
+      fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 2)." 8 58
     else
       exit_script
     fi
+  done
 
   # RAM Size
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 4096 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $RAM_SIZE ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="4096"; fi
-      RAM_SIZE="4096"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-    fi
         echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
+        break
+      fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 4096)." 8 58
     else
       exit_script
     fi
+  done
 
   # Bridge
   if BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Bridge" 8 58 vmbr0 --title "BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
@@ -305,42 +316,63 @@ function advanced_settings() {
   fi
 
   # MAC Address
+  while true; do
     if MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address" 8 58 $GEN_MAC --title "MAC ADDRESS" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MAC1 ]; then
+      if [ -z "$MAC1" ]; then
         MAC="$GEN_MAC"
-    else
-      MAC="$MAC1"
-    fi
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC${CL}"
+        break
+      fi
+      if [[ "$MAC1" =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]]; then
+        MAC="$MAC1"
+        echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC${CL}"
+        break
+      fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "Invalid MAC address format. Use XX:XX:XX:XX:XX:XX (e.g., AA:BB:CC:DD:EE:FF)." 8 58
     else
       exit_script
     fi
+  done
 
   # VLAN
+  while true; do
     if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan (leave blank for default)" 8 58 --title "VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $VLAN1 ]; then
+      if [ -z "$VLAN1" ]; then
         VLAN1="Default"
         VLAN=""
-    else
-      VLAN=",tag=$VLAN1"
-    fi
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
+        break
+      fi
+      if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
+        VLAN=",tag=$VLAN1"
+        echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
+        break
+      fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit_script
     fi
+  done
 
   # MTU
+  while true; do
     if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MTU1 ]; then
+      if [ -z "$MTU1" ]; then
         MTU1="Default"
         MTU=""
-    else
-      MTU=",mtu=$MTU1"
-    fi
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
+      fi
+      if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
+        MTU=",mtu=$MTU1"
+        echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
+      fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
     else
       exit_script
     fi
+  done
 
   # Start VM
   if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "START VIRTUAL MACHINE" --yesno "Start VM when completed?" 10 58); then

vm/haos-vm.sh

@@ -391,7 +391,10 @@ function advanced_settings() {
       HN="haos${BRANCH}"
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     else
-      HN=$(echo ${VM_NAME,,} | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     fi
   else
@@ -416,27 +419,31 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 2 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $CORE_COUNT ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="2"; fi
-      CORE_COUNT="2"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
-    else
         echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 2)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 2048 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $RAM_SIZE ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="4096"; fi
-      RAM_SIZE="4096"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
-    else
         echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 4096)." 8 58
     else
       exit-script
     fi
+  done
 
   if BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Bridge" 8 58 vmbr0 --title "BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
     if [ -z $BRG ]; then
@@ -449,43 +456,61 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address" 8 58 $GEN_MAC --title "MAC ADDRESS" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MAC1 ]; then
+      if [ -z "$MAC1" ]; then
         MAC="$GEN_MAC"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC${CL}"
-    else
+        break
+      fi
+      if [[ "$MAC1" =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]]; then
         MAC="$MAC1"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "Invalid MAC address format. Use XX:XX:XX:XX:XX:XX (e.g., AA:BB:CC:DD:EE:FF)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan(leave blank for default)" 8 58 --title "VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $VLAN1 ]; then
+      if [ -z "$VLAN1" ]; then
         VLAN1="Default"
         VLAN=""
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
-    else
+        break
+      fi
+      if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
         VLAN=",tag=$VLAN1"
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MTU1 ]; then
+      if [ -z "$MTU1" ]; then
         MTU1="Default"
         MTU=""
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
-    else
+        break
+      fi
+      if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
         MTU=",mtu=$MTU1"
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
   if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "START VIRTUAL MACHINE" --yesno "Start VM when completed?" 10 58); then
     echo -e "${DGN}Start VM when completed: ${BGN}yes${CL}"

vm/mikrotik-routeros.sh

@@ -377,7 +377,10 @@ function advanced_settings() {
       HN="mikrotik-routeros-chr"
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     else
-      HN=$(echo ${VM_NAME,,} | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     fi
   else
@@ -399,27 +402,31 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 2 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $CORE_COUNT ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="2"; fi
-      CORE_COUNT="2"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
-    else
         echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 2)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 2048 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $RAM_SIZE ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="2048"; fi
-      RAM_SIZE="2048"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
-    else
         echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 2048)." 8 58
     else
       exit-script
     fi
+  done
 
   if BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Bridge" 8 58 vmbr0 --title "BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
     if [ -z $BRG ]; then
@@ -432,43 +439,61 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address" 8 58 $GEN_MAC --title "MAC ADDRESS" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MAC1 ]; then
+      if [ -z "$MAC1" ]; then
         MAC="$GEN_MAC"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC${CL}"
-    else
+        break
+      fi
+      if [[ "$MAC1" =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]]; then
         MAC="$MAC1"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "Invalid MAC address format. Use XX:XX:XX:XX:XX:XX (e.g., AA:BB:CC:DD:EE:FF)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan(leave blank for default)" 8 58 --title "VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $VLAN1 ]; then
+      if [ -z "$VLAN1" ]; then
         VLAN1="Default"
         VLAN=""
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
-    else
+        break
+      fi
+      if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
         VLAN=",tag=$VLAN1"
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MTU1 ]; then
+      if [ -z "$MTU1" ]; then
         MTU1="Default"
         MTU=""
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
-    else
+        break
+      fi
+      if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
         MTU=",mtu=$MTU1"
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
   if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "START VIRTUAL MACHINE" --yesno "Start VM when completed?" 10 58); then
     echo -e "${GATEWAY}${BOLD}${DGN}Start VM when completed: ${BGN}yes${CL}"

vm/nextcloud-vm.sh

@@ -313,7 +313,10 @@ function advanced_settings() {
       HN="nextcloud-vm"
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     else
-      HN=$(echo ${VM_NAME,,} | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     fi
   else
@@ -335,27 +338,31 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 2 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $CORE_COUNT ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="2"; fi
-      CORE_COUNT="2"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
-    else
         echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 2)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 2048 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $RAM_SIZE ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="2048"; fi
-      RAM_SIZE="2048"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
-    else
         echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 2048)." 8 58
     else
       exit-script
     fi
+  done
 
   if BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Bridge" 8 58 vmbr0 --title "BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
     if [ -z $BRG ]; then
@@ -368,43 +375,61 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address" 8 58 $GEN_MAC --title "MAC ADDRESS" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MAC1 ]; then
+      if [ -z "$MAC1" ]; then
         MAC="$GEN_MAC"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC${CL}"
-    else
+        break
+      fi
+      if [[ "$MAC1" =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]]; then
         MAC="$MAC1"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "Invalid MAC address format. Use XX:XX:XX:XX:XX:XX (e.g., AA:BB:CC:DD:EE:FF)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan(leave blank for default)" 8 58 --title "VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $VLAN1 ]; then
+      if [ -z "$VLAN1" ]; then
         VLAN1="Default"
         VLAN=""
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
-    else
+        break
+      fi
+      if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
         VLAN=",tag=$VLAN1"
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MTU1 ]; then
+      if [ -z "$MTU1" ]; then
         MTU1="Default"
         MTU=""
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
-    else
+        break
+      fi
+      if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
         MTU=",mtu=$MTU1"
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
   if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "START VIRTUAL MACHINE" --yesno "Start VM when completed?" 10 58); then
     echo -e "${GATEWAY}${BOLD}${DGN}Start VM when completed: ${BGN}yes${CL}"

vm/openwrt-vm.sh

@@ -328,30 +328,41 @@ function advanced_settings() {
     if [ -z $VM_NAME ]; then
       HN="openwrt"
     else
-      HN=$(echo ${VM_NAME,,} | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
     fi
     echo -e "${DGN}Using Hostname: ${BGN}$HN${CL}"
   else
     exit-script
   fi
 
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 1 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $CORE_COUNT ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="1"; fi
-      CORE_COUNT="1"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-    fi
         echo -e "${DGN}Allocated Cores: ${BGN}$CORE_COUNT${CL}"
+        break
+      fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 1)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 256 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $RAM_SIZE ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="256"; fi
-      RAM_SIZE="256"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-    fi
         echo -e "${DGN}Allocated RAM: ${BGN}$RAM_SIZE${CL}"
+        break
+      fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 256)." 8 58
     else
       exit-script
     fi
+  done
 
   if DISK_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" \
     --inputbox "Set Disk Size in GiB (e.g., 1, 2, 4)" 8 58 "1" \
@@ -422,41 +433,62 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a WAN Vlan (leave blank for default)" 8 58 --title "WAN VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $VLAN1 ]; then
+      if [ -z "$VLAN1" ]; then
         VLAN1="Default"
         VLAN=""
-    else
-      VLAN=",tag=$VLAN1"
-    fi
         echo -e "${DGN}Using WAN Vlan: ${BGN}$VLAN1${CL}"
+        break
+      fi
+      if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
+        VLAN=",tag=$VLAN1"
+        echo -e "${DGN}Using WAN Vlan: ${BGN}$VLAN1${CL}"
+        break
+      fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if VLAN2=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a LAN Vlan" 8 58 999 --title "LAN VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $VLAN2 ]; then
+      if [ -z "$VLAN2" ]; then
         VLAN2="Default"
         LAN_VLAN=""
-    else
-      LAN_VLAN=",tag=$VLAN2"
-    fi
         echo -e "${DGN}Using LAN Vlan: ${BGN}$VLAN2${CL}"
+        break
+      fi
+      if [[ "$VLAN2" =~ ^[0-9]+$ ]] && [ "$VLAN2" -ge 1 ] && [ "$VLAN2" -le 4094 ]; then
+        LAN_VLAN=",tag=$VLAN2"
+        echo -e "${DGN}Using LAN Vlan: ${BGN}$VLAN2${CL}"
+        break
+      fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MTU1 ]; then
+      if [ -z "$MTU1" ]; then
         MTU1="Default"
         MTU=""
-    else
-      MTU=",mtu=$MTU1"
-    fi
         echo -e "${DGN}Using Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
+      fi
+      if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
+        MTU=",mtu=$MTU1"
+        echo -e "${DGN}Using Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
+      fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
   if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "START VIRTUAL MACHINE" --yesno "Start VM when completed?" 10 58); then
     START_VM="yes"

vm/opnsense-vm.sh

@@ -421,30 +421,41 @@ function advanced_settings() {
     if [ -z "$VM_NAME" ]; then
       HN="OPNsense"
     else
-      HN=$(echo ${VM_NAME,,} | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
     fi
     echo -e "${DGN}Using Hostname: ${BGN}$HN${CL}"
   else
     exit-script
   fi
 
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 4 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z "$CORE_COUNT" ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="4"; fi
-      CORE_COUNT="2"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-    fi
         echo -e "${DGN}Allocated Cores: ${BGN}$CORE_COUNT${CL}"
+        break
+      fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 4)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 8192 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $RAM_SIZE ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="8192"; fi
-      RAM_SIZE="8192"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-    fi
         echo -e "${DGN}Allocated RAM: ${BGN}$RAM_SIZE${CL}"
+        break
+      fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 8192)." 8 58
     else
       exit-script
     fi
+  done
 
   if BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a LAN Bridge" 8 58 vmbr0 --title "LAN BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
     if [ -z $BRG ]; then

vm/owncloud-vm.sh

@@ -314,7 +314,10 @@ function advanced_settings() {
       HN="owncloud-vm"
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     else
-      HN=$(echo ${VM_NAME,,} | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     fi
   else
@@ -336,27 +339,31 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 2 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $CORE_COUNT ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="2"; fi
-      CORE_COUNT="2"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
-    else
         echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 2)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 2048 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $RAM_SIZE ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="2048"; fi
-      RAM_SIZE="2048"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
-    else
         echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 2048)." 8 58
     else
       exit-script
     fi
+  done
 
   if BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Bridge" 8 58 vmbr0 --title "BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
     if [ -z $BRG ]; then
@@ -369,43 +376,61 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address" 8 58 $GEN_MAC --title "MAC ADDRESS" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MAC1 ]; then
+      if [ -z "$MAC1" ]; then
         MAC="$GEN_MAC"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC${CL}"
-    else
+        break
+      fi
+      if [[ "$MAC1" =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]]; then
         MAC="$MAC1"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "Invalid MAC address format. Use XX:XX:XX:XX:XX:XX (e.g., AA:BB:CC:DD:EE:FF)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan(leave blank for default)" 8 58 --title "VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $VLAN1 ]; then
+      if [ -z "$VLAN1" ]; then
         VLAN1="Default"
         VLAN=""
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
-    else
+        break
+      fi
+      if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
         VLAN=",tag=$VLAN1"
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MTU1 ]; then
+      if [ -z "$MTU1" ]; then
         MTU1="Default"
         MTU=""
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
-    else
+        break
+      fi
+      if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
         MTU=",mtu=$MTU1"
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
   if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "START VIRTUAL MACHINE" --yesno "Start VM when completed?" 10 58); then
     echo -e "${GATEWAY}${BOLD}${DGN}Start VM when completed: ${BGN}yes${CL}"

vm/pimox-haos-vm.sh

@@ -274,26 +274,35 @@ function advanced_settings() {
     echo -e "${DGN}Using Hostname: ${BGN}$HN${CL}"
   else
     if [ $exitstatus = 0 ]; then
-      HN=$(echo ${VM_NAME,,} | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
       echo -e "${DGN}Using Hostname: ${BGN}$HN${CL}"
     fi
   fi
+  while true; do
     CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 2 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3)
     exitstatus=$?
-  if [ -z $CORE_COUNT ]; then
+    if [ $exitstatus -ne 0 ]; then exit-script; fi
-    CORE_COUNT="2"
+    if [ -z "$CORE_COUNT" ]; then CORE_COUNT="2"; fi
+    if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
       echo -e "${DGN}Allocated Cores: ${BGN}$CORE_COUNT${CL}"
-  else
+      break
-    if [ $exitstatus = 0 ]; then echo -e "${DGN}Allocated Cores: ${BGN}$CORE_COUNT${CL}"; fi
     fi
+    whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 2)." 8 58
+  done
+  while true; do
     RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 4096 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3)
     exitstatus=$?
-  if [ -z $RAM_SIZE ]; then
+    if [ $exitstatus -ne 0 ]; then exit-script; fi
-    RAM_SIZE="4096"
+    if [ -z "$RAM_SIZE" ]; then RAM_SIZE="4096"; fi
+    if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
       echo -e "${DGN}Allocated RAM: ${BGN}$RAM_SIZE${CL}"
-  else
+      break
-    if [ $exitstatus = 0 ]; then echo -e "${DGN}Allocated RAM: ${BGN}$RAM_SIZE${CL}"; fi
     fi
+    whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 4096)." 8 58
+  done
   BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Bridge" 8 58 vmbr0 --title "BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3)
   exitstatus=$?
   if [ -z $BRG ]; then
@@ -302,39 +311,56 @@ function advanced_settings() {
   else
     if [ $exitstatus = 0 ]; then echo -e "${DGN}Using Bridge: ${BGN}$BRG${CL}"; fi
   fi
+  while true; do
     MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address" 8 58 $GEN_MAC --title "MAC ADDRESS" --cancel-button Exit-Script 3>&1 1>&2 2>&3)
     exitstatus=$?
-  if [ -z $MAC1 ]; then
+    if [ $exitstatus -ne 0 ]; then exit-script; fi
+    if [ -z "$MAC1" ]; then
       MAC="$GEN_MAC"
       echo -e "${DGN}Using MAC Address: ${BGN}$MAC${CL}"
-  else
+      break
-    if [ $exitstatus = 0 ]; then
+    fi
+    if [[ "$MAC1" =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]]; then
       MAC="$MAC1"
       echo -e "${DGN}Using MAC Address: ${BGN}$MAC1${CL}"
+      break
     fi
-  fi
+    whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "Invalid MAC address format. Use XX:XX:XX:XX:XX:XX (e.g., AA:BB:CC:DD:EE:FF)." 8 58
+  done
+  while true; do
     VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan(leave blank for default)" 8 58 --title "VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3)
     exitstatus=$?
-  if [ $exitstatus = 0 ]; then
+    if [ $exitstatus -ne 0 ]; then exit-script; fi
-    if [ -z $VLAN1 ]; then
+    if [ -z "$VLAN1" ]; then
-      VLAN1="Default" VLAN=""
+      VLAN1="Default"
+      VLAN=""
       echo -e "${DGN}Using Vlan: ${BGN}$VLAN1${CL}"
-    else
+      break
+    fi
+    if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
       VLAN=",tag=$VLAN1"
       echo -e "${DGN}Using Vlan: ${BGN}$VLAN1${CL}"
+      break
     fi
-  fi
+    whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
+  done
+  while true; do
     MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3)
     exitstatus=$?
-  if [ $exitstatus = 0 ]; then
+    if [ $exitstatus -ne 0 ]; then exit-script; fi
-    if [ -z $MTU1 ]; then
+    if [ -z "$MTU1" ]; then
-      MTU1="Default" MTU=""
+      MTU1="Default"
+      MTU=""
       echo -e "${DGN}Using Interface MTU Size: ${BGN}$MTU1${CL}"
-    else
+      break
+    fi
+    if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
       MTU=",mtu=$MTU1"
       echo -e "${DGN}Using Interface MTU Size: ${BGN}$MTU1${CL}"
+      break
     fi
-  fi
+    whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
+  done
   if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "START VIRTUAL MACHINE" --yesno "Start VM when completed?" 10 58); then
     echo -e "${DGN}Start VM when completed: ${BGN}yes${CL}"
     START_VM="yes"

vm/truenas-vm.sh

@@ -355,7 +355,10 @@ function advanced_settings() {
     if [ -z $VM_NAME ]; then
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     else
-      HN=$(echo ${VM_NAME,,} | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     fi
   else
@@ -380,27 +383,31 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 "$CORE_COUNT" --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $CORE_COUNT ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="2"; fi
-      CORE_COUNT="2"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
-    else
         echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 2)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 "$RAM_SIZE" --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $RAM_SIZE ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="8192"; fi
-      RAM_SIZE="8192"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
-    else
         echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 8192)." 8 58
     else
       exit-script
     fi
+  done
 
   if BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Bridge" 8 58 "$BRG" --title "BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
     if [ -z $BRG ]; then
@@ -413,43 +420,61 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address" 8 58 $GEN_MAC --title "MAC ADDRESS" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MAC1 ]; then
+      if [ -z "$MAC1" ]; then
         MAC="$GEN_MAC"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC${CL}"
-    else
+        break
+      fi
+      if [[ "$MAC1" =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]]; then
         MAC="$MAC1"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "Invalid MAC address format. Use XX:XX:XX:XX:XX:XX (e.g., AA:BB:CC:DD:EE:FF)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan(leave blank for default)" 8 58 --title "VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $VLAN1 ]; then
+      if [ -z "$VLAN1" ]; then
         VLAN1="Default"
         VLAN=""
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
-    else
+        break
+      fi
+      if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
         VLAN=",tag=$VLAN1"
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MTU1 ]; then
+      if [ -z "$MTU1" ]; then
         MTU1="Default"
         MTU=""
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
-    else
+        break
+      fi
+      if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
         MTU=",mtu=$MTU1"
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
   if (whiptail --backtitle "Proxmox VE Helper Scripts" --defaultno --title "IMPORT ONBOARD DISKS" --yesno "Would you like to import onboard disks?" 10 58); then
     echo -e "${DISK}${BOLD}${DGN}Import onboard disks: ${BGN}yes${CL}"

vm/ubuntu2204-vm.sh

@@ -310,7 +310,10 @@ function advanced_settings() {
       HN="ubuntu"
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     else
-      HN=$(echo ${VM_NAME,,} | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     fi
   else
@@ -332,27 +335,31 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 2 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $CORE_COUNT ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="2"; fi
-      CORE_COUNT="2"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
-    else
         echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 2)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 2048 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $RAM_SIZE ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="2048"; fi
-      RAM_SIZE="2048"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
-    else
         echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 2048)." 8 58
     else
       exit-script
     fi
+  done
 
   if BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Bridge" 8 58 vmbr0 --title "BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
     if [ -z $BRG ]; then
@@ -365,43 +372,61 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address" 8 58 $GEN_MAC --title "MAC ADDRESS" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MAC1 ]; then
+      if [ -z "$MAC1" ]; then
         MAC="$GEN_MAC"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC${CL}"
-    else
+        break
+      fi
+      if [[ "$MAC1" =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]]; then
         MAC="$MAC1"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "Invalid MAC address format. Use XX:XX:XX:XX:XX:XX (e.g., AA:BB:CC:DD:EE:FF)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan(leave blank for default)" 8 58 --title "VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $VLAN1 ]; then
+      if [ -z "$VLAN1" ]; then
         VLAN1="Default"
         VLAN=""
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
-    else
+        break
+      fi
+      if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
         VLAN=",tag=$VLAN1"
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MTU1 ]; then
+      if [ -z "$MTU1" ]; then
         MTU1="Default"
         MTU=""
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
-    else
+        break
+      fi
+      if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
         MTU=",mtu=$MTU1"
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
   if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "START VIRTUAL MACHINE" --yesno "Start VM when completed?" 10 58); then
     echo -e "${GATEWAY}${BOLD}${DGN}Start VM when completed: ${BGN}yes${CL}"

vm/ubuntu2404-vm.sh

@@ -313,7 +313,10 @@ function advanced_settings() {
       HN="ubuntu"
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     else
-      HN=$(echo ${VM_NAME,,} | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     fi
   else
@@ -335,27 +338,31 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 2 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $CORE_COUNT ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="2"; fi
-      CORE_COUNT="2"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
-    else
         echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 2)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 2048 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $RAM_SIZE ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="2048"; fi
-      RAM_SIZE="2048"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
-    else
         echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 2048)." 8 58
     else
       exit-script
     fi
+  done
 
   if BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Bridge" 8 58 vmbr0 --title "BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
     if [ -z $BRG ]; then
@@ -368,43 +375,61 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address" 8 58 $GEN_MAC --title "MAC ADDRESS" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MAC1 ]; then
+      if [ -z "$MAC1" ]; then
         MAC="$GEN_MAC"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC${CL}"
-    else
+        break
+      fi
+      if [[ "$MAC1" =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]]; then
         MAC="$MAC1"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "Invalid MAC address format. Use XX:XX:XX:XX:XX:XX (e.g., AA:BB:CC:DD:EE:FF)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan(leave blank for default)" 8 58 --title "VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $VLAN1 ]; then
+      if [ -z "$VLAN1" ]; then
         VLAN1="Default"
         VLAN=""
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
-    else
+        break
+      fi
+      if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
         VLAN=",tag=$VLAN1"
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MTU1 ]; then
+      if [ -z "$MTU1" ]; then
         MTU1="Default"
         MTU=""
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
-    else
+        break
+      fi
+      if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
         MTU=",mtu=$MTU1"
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
   if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "START VIRTUAL MACHINE" --yesno "Start VM when completed?" 10 58); then
     echo -e "${GATEWAY}${BOLD}${DGN}Start VM when completed: ${BGN}yes${CL}"

vm/ubuntu2504-vm.sh

@@ -312,7 +312,10 @@ function advanced_settings() {
       HN="ubuntu"
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     else
-      HN=$(echo ${VM_NAME,,} | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     fi
   else
@@ -334,27 +337,31 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 2 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $CORE_COUNT ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="2"; fi
-      CORE_COUNT="2"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
-    else
         echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 2)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 2048 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $RAM_SIZE ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="2048"; fi
-      RAM_SIZE="2048"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
-    else
         echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 2048)." 8 58
     else
       exit-script
     fi
+  done
 
   if BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Bridge" 8 58 vmbr0 --title "BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
     if [ -z $BRG ]; then
@@ -367,43 +374,61 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address" 8 58 $GEN_MAC --title "MAC ADDRESS" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MAC1 ]; then
+      if [ -z "$MAC1" ]; then
         MAC="$GEN_MAC"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC${CL}"
-    else
+        break
+      fi
+      if [[ "$MAC1" =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]]; then
         MAC="$MAC1"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "Invalid MAC address format. Use XX:XX:XX:XX:XX:XX (e.g., AA:BB:CC:DD:EE:FF)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan(leave blank for default)" 8 58 --title "VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $VLAN1 ]; then
+      if [ -z "$VLAN1" ]; then
         VLAN1="Default"
         VLAN=""
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
-    else
+        break
+      fi
+      if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
         VLAN=",tag=$VLAN1"
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MTU1 ]; then
+      if [ -z "$MTU1" ]; then
         MTU1="Default"
         MTU=""
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
-    else
+        break
+      fi
+      if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
         MTU=",mtu=$MTU1"
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
   if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "START VIRTUAL MACHINE" --yesno "Start VM when completed?" 10 58); then
     echo -e "${GATEWAY}${BOLD}${DGN}Start VM when completed: ${BGN}yes${CL}"

vm/umbrel-os-vm.sh

@@ -373,7 +373,10 @@ function advanced_settings() {
       HN="umbrelos"
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     else
-      HN=$(echo ${VM_NAME,,} | tr -d ' ')
+      HN=$(echo "${VM_NAME,,}" | tr -cs 'a-z0-9-' '-' | sed 's/^-//;s/-$//')
+      if [ "$HN" != "${VM_NAME,,}" ]; then
+        whiptail --backtitle "Proxmox VE Helper Scripts" --title "HOSTNAME ADJUSTED" --msgbox "Invalid characters detected. Hostname has been adjusted to:\n\n  $HN" 10 58
+      fi
       echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
     fi
   else
@@ -398,27 +401,31 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate CPU Cores" 8 58 2 --title "CORE COUNT" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $CORE_COUNT ]; then
+      if [ -z "$CORE_COUNT" ]; then CORE_COUNT="2"; fi
-      CORE_COUNT="2"
+      if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
-    else
         echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "CPU Cores must be a positive integer (e.g., 2)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Allocate RAM in MiB" 8 58 2048 --title "RAM" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $RAM_SIZE ]; then
+      if [ -z "$RAM_SIZE" ]; then RAM_SIZE="2048"; fi
-      RAM_SIZE="2048"
+      if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
-      echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
-    else
         echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}$RAM_SIZE${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "RAM Size must be a positive integer in MiB (e.g., 2048)." 8 58
     else
       exit-script
     fi
+  done
 
   if BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Bridge" 8 58 vmbr0 --title "BRIDGE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
     if [ -z $BRG ]; then
@@ -431,43 +438,61 @@ function advanced_settings() {
     exit-script
   fi
 
+  while true; do
     if MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address" 8 58 $GEN_MAC --title "MAC ADDRESS" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MAC1 ]; then
+      if [ -z "$MAC1" ]; then
         MAC="$GEN_MAC"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC${CL}"
-    else
+        break
+      fi
+      if [[ "$MAC1" =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]]; then
         MAC="$MAC1"
         echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "Invalid MAC address format. Use XX:XX:XX:XX:XX:XX (e.g., AA:BB:CC:DD:EE:FF)." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan(leave blank for default)" 8 58 --title "VLAN" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $VLAN1 ]; then
+      if [ -z "$VLAN1" ]; then
         VLAN1="Default"
         VLAN=""
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
-    else
+        break
+      fi
+      if [[ "$VLAN1" =~ ^[0-9]+$ ]] && [ "$VLAN1" -ge 1 ] && [ "$VLAN1" -le 4094 ]; then
         VLAN=",tag=$VLAN1"
         echo -e "${VLANTAG}${BOLD}${DGN}VLAN: ${BGN}$VLAN1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "VLAN must be a number between 1 and 4094, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
+  while true; do
     if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default)" 8 58 --title "MTU SIZE" --cancel-button Exit-Script 3>&1 1>&2 2>&3); then
-    if [ -z $MTU1 ]; then
+      if [ -z "$MTU1" ]; then
         MTU1="Default"
         MTU=""
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
-    else
+        break
+      fi
+      if [[ "$MTU1" =~ ^[0-9]+$ ]] && [ "$MTU1" -ge 576 ] && [ "$MTU1" -le 65520 ]; then
         MTU=",mtu=$MTU1"
         echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
+        break
       fi
+      whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID INPUT" --msgbox "MTU Size must be a number between 576 and 65520, or leave blank for default." 8 58
     else
       exit-script
     fi
+  done
 
   if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "START VIRTUAL MACHINE" --yesno "Start VM when completed?" 10 58); then
     echo -e "${GATEWAY}${BOLD}${DGN}Start VM when completed: ${BGN}yes${CL}"