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#!/bin/bash # Unified noVNC launcher (host desktop :0 preferred; fallback to virtual :1+XFCE) # Default: no password (-nopw). Set VNC_PASSWORD to enable password auth. # Comments are in English. set -euo pipefail # ----------------------------- # Config (override via env) # ----------------------------- USE_HOST_DESKTOP="${USE_HOST_DESKTOP:-1}" # 1 => prefer host desktop :0, 0 => force virtual :1 DISPLAY_VIRTUAL="${DISPLAY_VIRTUAL:-:1}" # Virtual display when USE_HOST_DESKTOP=0 RESOLUTION="${RESOLUTION:-2560x1440x24}" # WxHxD for Xvfb when virtual VNC_PORT="${VNC_PORT:-5900}" NOVNC_PORT="${NOVNC_PORT:-6080}" NOVNC_WEB_DIR="${NOVNC_WEB_DIR:-/usr/share/novnc}" AUTOLINK_INDEX="${AUTOLINK_INDEX:-1}" # 1 => symlink index.html -> vnc.html VNC_PASSWORD="${VNC_PASSWORD:-}" # empty => no password # ----------------------------- # Helpers # ----------------------------- port_listen() { local port="$1" if command -v ss >/dev/null 2>&1; then ss -ltnp 2>/dev/null | grep -q ":${port} " else netstat -ltnp 2>/dev/null | grep -q ":${port} " fi } wait_for_sock() { local disp="$1" local sock="/tmp/.X11-unix/X${disp#:}" local i=0 while [ $i -lt 120 ]; do [ -S "$sock" ] && return 0 sleep 0.1 i=$((i+1)) done return 1 } ensure_pkg() { #sudo apt-get update -y sudo apt-get install -y "$@" } start_websockify() { local port="$1" target="$2" if port_listen "$port"; then pkill -f "websockify .* ${port} " 2>/dev/null || true sleep 0.5 fi nohup websockify --libserver --web "${NOVNC_WEB_DIR}" "${port}" "${target}" >/dev/null 2>&1 & local i=0 while [ $i -lt 80 ]; do port_listen "${port}" && return 0 sleep 0.1 i=$((i+1)) done echo "noVNC failed to bind ${port}" >&2 return 1 } x11vnc_args_for_display() { local disp="$1" local args=(-display "$disp" -rfbport "$VNC_PORT" -forever -shared -xrandr -ncache 0 -noxdamage) if [ -n "$VNC_PASSWORD" ]; then mkdir -p ~/.vnc x11vnc -storepasswd "$VNC_PASSWORD" ~/.vnc/passwd >/dev/null 2>&1 args+=(-rfbauth ~/.vnc/passwd) else args+=(-nopw) fi printf '%s\n' "${args[@]}" } # ----------------------------- # 1) Install dependencies # ----------------------------- ensure_pkg x11vnc novnc python3-websockify # Virtual desktop deps (only used when falling back) ensure_pkg xvfb xfce4 xfce4-terminal xfce4-goodies dbus-x11 x11-apps [ -d "$NOVNC_WEB_DIR" ] || { echo "noVNC dir not found: $NOVNC_WEB_DIR"; exit 1; } # ----------------------------- # 2) Decide mode (prefer host :0 if socket exists) # ----------------------------- HOST_XSOCK="/tmp/.X11-unix/X0" if [ "$USE_HOST_DESKTOP" = "1" ] && [ -S "$HOST_XSOCK" ]; then MODE="host"; TARGET_DISPLAY=":0" else MODE="virtual"; TARGET_DISPLAY="$DISPLAY_VIRTUAL" fi echo "[mode] ${MODE} (DISPLAY ${TARGET_DISPLAY})" # ----------------------------- # 3A) Host desktop (:0) # ----------------------------- if [ "$MODE" = "host" ]; then # Clean stale processes pkill -x x11vnc 2>/dev/null || true pkill -f "websockify .* ${NOVNC_PORT} " 2>/dev/null || true # Build x11vnc args and include -auth guess for :0 # shellcheck disable=SC2207 VNC_ARGS=($(x11vnc_args_for_display "$TARGET_DISPLAY")) VNC_ARGS+=(-auth guess) nohup x11vnc "${VNC_ARGS[@]}" >/dev/null 2>&1 & i=0 while [ $i -lt 80 ]; do port_listen "$VNC_PORT" && break sleep 0.1 i=$((i+1)) done port_listen "$VNC_PORT" || { echo "x11vnc not listening on ${VNC_PORT}"; exit 1; } start_websockify "$NOVNC_PORT" "localhost:${VNC_PORT}" if [ "$AUTOLINK_INDEX" = "1" ] && [ -f "${NOVNC_WEB_DIR}/vnc.html" ]; then ln -sf "${NOVNC_WEB_DIR}/vnc.html" "${NOVNC_WEB_DIR}/index.html" 2>/dev/null || true fi echo "" echo "-----------------------------------------" echo "Ready (host :0)." echo "VNC: localhost:${VNC_PORT}" echo "noVNC: http://localhost:${NOVNC_PORT}/vnc.html?autoconnect=1&host=localhost&port=${NOVNC_PORT}" if [ -z "$VNC_PASSWORD" ]; then echo "Auth: none (-nopw) [WARNING: insecure on untrusted networks]" else echo "Auth: password (~/.vnc/passwd)" fi echo "-----------------------------------------" exit 0 fi # ----------------------------- # 3B) Virtual desktop (:1 + XFCE) # ----------------------------- # Start Xvfb if [ -S "/tmp/.X11-unix/X${TARGET_DISPLAY#:}" ]; then echo "· ${TARGET_DISPLAY} exists, skip Xvfb" else nohup Xvfb "${TARGET_DISPLAY}" -screen 0 "${RESOLUTION}" -ac +extension RANDR -nolisten tcp -noreset >/dev/null 2>&1 & wait_for_sock "${TARGET_DISPLAY}" || { echo "Xvfb did not come up"; exit 1; } fi echo "✓ X ready: ${TARGET_DISPLAY}" # Ensure XDG_RUNTIME_DIR and start XFCE once export XDG_RUNTIME_DIR="${XDG_RUNTIME_DIR:-/tmp/xdg-$(id -u)}" mkdir -p "$XDG_RUNTIME_DIR" && chmod 700 "$XDG_RUNTIME_DIR" || true if ! pgrep -a xfwm4 >/dev/null 2>&1 && ! pgrep -a startxfce4 >/dev/null 2>&1; then DISPLAY="${TARGET_DISPLAY}" nohup dbus-launch startxfce4 >/tmp/xfce.log 2>&1 & sleep 2 fi # Start x11vnc on virtual display pkill -x x11vnc 2>/dev/null || true sleep 0.3 # shellcheck disable=SC2207 VNC_ARGS=($(x11vnc_args_for_display "$TARGET_DISPLAY")) nohup x11vnc "${VNC_ARGS[@]}" >/dev/null 2>&1 & i=0 while [ $i -lt 80 ]; do port_listen "$VNC_PORT" && break sleep 0.1 i=$((i+1)) done port_listen "$VNC_PORT" || { echo "x11vnc not listening on ${VNC_PORT}"; exit 1; } # Start websockify start_websockify "$NOVNC_PORT" "localhost:${VNC_PORT}" # Optional: default to UI if [ "$AUTOLINK_INDEX" = "1" ] && [ -f "${NOVNC_WEB_DIR}/vnc.html" ]; then ln -sf "${NOVNC_WEB_DIR}/vnc.html" "${NOVNC_WEB_DIR}/index.html" 2>/dev/null || true fi echo "" echo "-----------------------------------------" echo "Ready (virtual XFCE)." echo "DISPLAY: ${TARGET_DISPLAY} (${RESOLUTION%x*})" echo "VNC: localhost:${VNC_PORT}" echo "noVNC: http://localhost:${NOVNC_PORT}/vnc.html?autoconnect=1&host=localhost&port=${NOVNC_PORT}" echo "Logs: /tmp/xfce.log" if [ -z "$VNC_PASSWORD" ]; then echo "Auth: none (-nopw) [WARNING: insecure on untrusted networks]" else echo "Auth: password (~/.vnc/passwd)" fi echo "-----------------------------------------"