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#!/sbin/openrc-run

description="Load USBIP kernel modules and run daemon"

: ${USBIP_EXEC:=$(which usbip)}
: ${USBIP_EXEC_DAEMON:=$(which usbipd)}

depend()
{
  provide usbip
  need sysfs net
}

LoadKernelModule ()
{
  local module=$1
  #-----------------
  result=
  if [ -z "$(/sbin/lsmod | grep "^$(basename $module)")" ]
  then
    local filename=$(find lib/modules/`uname -r`/kernel -type f -name $module.ko -printf '%f\n')
    if [ -n "$filename" ]
    then
      if ! /sbin/modprobe $module
      then
        eerror "Cannot load kernel module '$module'."
        result=failed
      fi
    else
      eerror "Cannot find kernel module '$module'."
      result=failed
    fi
  fi
  [ -z "$result" ]
}

IsAvailable ()
{
  local bus_or_device=$(echo $1 | tr '[A-Z]' '[a-z]')
  local host=$2
  #-----------------
  host=${host:+--remote=$host}
  : ${host:=--local}
  $USBIP_EXEC list --parsable $host |
    sed -n 's|.*busid='$bus_or_device'#.*|yes|p; \
            s|.*usbid='$bus_or_device'#.*|yes|p'
}

GetBus ()
{
  local device=$(echo $1 | tr '[A-Z]' '[a-z]')
  local host=$2
  #-----------------
  host=${host:+--remote=$host}
  : ${host:=--local}
  case "$host" in
    "--remote"*) # FIXME: USBIP bug causing remote devices not to be listed parsable
      $USBIP_EXEC list --parsable $host |
        sed -n 's|^[ \t]*\([0-9][0-9]*-[0-9][0-9]*\):.*('"$device"').*|\1|p';;
    *)
      $USBIP_EXEC list --parsable $host |
        sed -n 's|.*busid=\([0-9][0-9]*-[0-9][0-9]*\)#usbid='"$device"'#.*|\1|p';;
  esac
}

ExecuteUsbip()
{
  local command=$1
  local bus=$2
  local host=$3
  local port=$4
  #-----------------
  local result=
  if [ -n "$command" ]
  then
    if $USBIP_EXEC $command ${bus:+--busid=$bus} ${host:+--remote=$host} ${port:+--port $port} 1> /dev/null 2> /dev/null
    then
      einfo "Executed command '$command'${bus:+ with bus '$bus'}${host:+ on host '$host'}${port:+ on port '$port'}, successfully."
    else
      ewarn "Executing command '$command'${bus:+ with bus '$bus'}${host:+ on host '$host'}${port:+ on port '$port'} failed."
      result=failed
    fi
  fi
  [ -z "$result" ]
}

ValidateCommand ()
{
  local command=$1
  local bus_or_device=$2
  local host=$3
  #-----------------
  local result=
  local bus=
  if [ -z "$host" -o -n "$(echo $host | grep '^[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*$')" ]
  then
    if [ -n "$(echo $bus_or_device | grep '^[[:xdigit:]]\{4\}:[[:xdigit:]]\{4\}$')" ]
    then
      bus="$(GetBus $bus_or_device $host)"
      if [ -z "$bus" ]
      then
        ewarn "Device '$bus_or_device' not available${host:+ on host '$host'}."
        result=failed
      fi
    else
      if [ -n "$(echo $bus_or_device | grep '^[0-9][0-9]*-[0-9][0-9]*$')" ]
      then
        bus=$bus_or_device
      else
        ewarn "Unrecognized bus or device '$bus_or_device'."
        result=failed
      fi
    fi
    if [ -n "$bus" ]
    then
      case "$command" in
        "bind"|"unbind")
          ExecuteUsbip $command $bus || result=failed;;
        "attach")
          if [ -n "$host" ]
          then
            ExecuteUsbip $command $bus $host || result=failed
          else
            ewarn "Host statement is missing in command '$command'."
            result=failed
          fi
          ;;
        *)
          ewarn "Unhandled command '$command'."; result=failed;;
      esac
    fi
  else
    ewarn "Illegal host ip address '$host'."
    result=failed
  fi
  [ -z "$result" ]
}

ProcessList ()
{
  local command=$1
  shift
  local list=$*
  #-----------------
  local result=
  local no_host=
  case "$command" in
    "bind"|"unbind") no_host=yes;;
    *)               no_host=;;
  esac
  local host=
  local item=
  ( for item in $list
  do
    if [ -n "$host" -o -n "$no_host" ]
    then
      ValidateCommand $command $item $host || result=failed
      host=
    else
      host=$item
    fi
  done
  [ -z "$result" ] )
}

DetachAll ()
{
  # FIXME: At this stage, there is no way to get the vhci_hcd port id of any attached device
  for port in $(seq 0 15)
  do
    $USBIP_EXEC detach --port $port 2> /dev/null
  done
  [ 1 -eq 1 ]
}

UnbindAll ()
{
  local result=
  ProcessList unbind "$($USBIP_EXEC list --parsable --local | sed -n 's|^busid=\([0-9][0-9]*-[0-9][0-9]*\)#.*=usbip-host#$|\1|p' | tr '\n' ' ')"
}

start_daemon()
{
  ebegin "Starting usbip daemon"
  if LoadKernelModule usbip-host
  then
    start-stop-daemon --start --exec $USBIP_EXEC_DAEMON -- -D
  fi
  eend $?
}

start()
{
  ebegin "Starting usbip"
  if LoadKernelModule usbip-core
  then
    if LoadKernelModule vhci-hcd
    then
      eend 0
      if yesno "${USBIP_START_DAEMON:-no}"
      then
        start_daemon
      fi
      if [ -n "$USBIP_AUTO_BIND" ]
      then
        ebegin "Auto-binding local busses"
        ProcessList bind $USBIP_AUTO_BIND
        eend $?
      fi
      if [ -n "$USBIP_AUTO_ATTACH" ]
      then
        ebegin "Auto-attaching remote busses"
        ProcessList attach $USBIP_AUTO_ATTACH
        eend $?
      fi
    else
      eend 1
    fi
  else
    eend 1
  fi
}

stop_daemon()
{
  ebegin "Stopping usbip daemon"
  start-stop-daemon --stop --exec $USBIP_EXEC_DAEMON
  eend $?
}

stop()
{
  ebegin "Detaching remote busses"
  DetachAll
  eend $?
  ebegin "Un-binding local busses"
  UnbindAll
  eend $?
  if [ -n "$(pidof $(basename "$USBIP_EXEC_DAEMON"))" ]
  then
    stop_daemon
  fi
}