1 files changed, 43 insertions, 0 deletions
diff --git a/share/hydractl/usb-disable b/share/hydractl/usb-disable
new file mode 100755
index 0000000..9314bf3
--- /dev/null
+++ b/share/hydractl/usb-disable
@@ -0,0 +1,43 @@
+#!/bin/bash
+#
+# USB hotplug switcher.
+# See https://links.fluxo.info/tags/badusb
+#     https://www.kernel.org/doc/Documentation/usb/authorization.txt
+#     http://marc.info/?l=git-commits-head&m=131166366113680&w=2
+
+# Parameters
+BASENAME="`basename $0`"
+
+# Set hotplug state
+function usb_set_state {
+  echo "Applying at /sys/module/usbcore/parameters/authorized_default..."
+  sudo su -c "echo $1 > /sys/module/usbcore/parameters/authorized_default"
+
+  for bus in /sys/bus/usb/devices/usb*; do
+    echo "Applying at ${bus}/authorized_default..."
+    sudo su -c "echo $1 > ${bus}/authorized_default"
+  done
+}
+
+# Dispatch
+if [ "$BASENAME" == 'usb-enable' ]; then
+  usb_set_state 1
+elif [ "$BASENAME" == 'usb-disable' ]; then
+  usb_set_state 0
+elif [ "$BASENAME" == 'usb-status' ]; then
+  status="`cat /sys/module/usbcore/parameters/authorized_default`"
+
+  # The "authorized_default" module parameter of usbcore controls the default
+  # for the authorized_default variable of each USB host controller.
+  #
+  # -1 is authorized for all devices except wireless (default, old behaviour)
+  # 0 is unauthorized for all devices
+  # 1 is authorized for all devices
+  if [ "$status" == "0" ]; then
+    echo "Hotplug disabled."
+  elif [ "$status" == "1" ]; then
+    echo "Hotplug enabled."
+  elif [ "$status" == "-1" ]; then
+    echo "Hotplug enabled except wireless"
+  fi
+fi