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# ========================================================================== #
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2018 Maxim Devaev <[email protected]> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import os
import re
import time
import argparse
from os.path import join # pylint: disable=ungrouped-imports
from typing import List
from typing import Optional
from ...logging import get_logger
from ...yamlconf import Section
from ...validators import ValidatorError
from .. import init
from .hid import Hid
from .hid.keyboard import KEYBOARD_HID
from .hid.mouse import MOUSE_HID
# =====
def _mkdir(path: str) -> None:
get_logger().info("MKDIR --- %s", path)
os.mkdir(path)
def _symlink(src: str, dest: str) -> None:
get_logger().info("SYMLINK - %s --> %s", dest, src)
os.symlink(src, dest)
def _rmdir(path: str) -> None:
get_logger().info("RMDIR --- %s", path)
os.rmdir(path)
def _unlink(path: str) -> None:
get_logger().info("RM ------ %s", path)
os.unlink(path)
def _write(path: str, text: str) -> None:
get_logger().info("WRITE --- %s", path)
with open(path, "w") as param_file:
param_file.write(text)
def _write_bytes(path: str, data: bytes) -> None:
get_logger().info("WRITE --- %s", path)
with open(path, "wb") as param_file:
param_file.write(data)
def _find_udc(udc: str) -> str:
udcs = sorted(os.listdir("/sys/class/udc"))
if not udc:
if len(udcs) == 0:
raise RuntimeError("Can't find any UDC")
udc = udcs[0]
elif udc not in udcs:
raise RuntimeError(f"Can't find selected UDC: {udc}")
get_logger().info("Using UDC %s", udc)
return udc
def _check_config(config: Section) -> None:
if (
not config.otg.acm.enabled
and config.kvmd.hid.type != "otg"
and config.kvmd.msd.type != "otg"
):
raise RuntimeError("Nothing to do")
# =====
def _create_acm(gadget_path: str, config_path: str) -> None:
func_path = join(gadget_path, "functions/acm.usb0")
_mkdir(func_path)
_symlink(func_path, join(config_path, "acm.usb0"))
def _create_hid(gadget_path: str, config_path: str, hid: Hid, instance: int) -> None:
func_path = join(gadget_path, f"functions/hid.usb{instance}")
_mkdir(func_path)
_write(join(func_path, "protocol"), str(hid.protocol))
_write(join(func_path, "subclass"), str(hid.subclass))
_write(join(func_path, "report_length"), str(hid.report_length))
_write_bytes(join(func_path, "report_desc"), hid.report_descriptor)
_symlink(func_path, join(config_path, f"hid.usb{instance}"))
def _create_msd(gadget_path: str, config_path: str, instance: int, cdrom: bool, rw: bool) -> None:
func_path = join(gadget_path, f"functions/mass_storage.usb{instance}")
_mkdir(func_path)
_write(join(func_path, "stall"), "0")
_write(join(func_path, "lun.0/cdrom"), ("1" if cdrom else "0"))
_write(join(func_path, "lun.0/ro"), ("0" if rw else "1"))
_write(join(func_path, "lun.0/removable"), "1")
_write(join(func_path, "lun.0/nofua"), "0")
_symlink(func_path, join(config_path, f"mass_storage.usb{instance}"))
def _cmd_start(config: Section) -> None:
# https://www.kernel.org/doc/Documentation/usb/gadget_configfs.txt
# https://www.isticktoit.net/?p=1383
logger = get_logger()
_check_config(config)
udc = _find_udc(config.otg.udc)
logger.info("Creating gadget %r ...", config.otg.gadget)
gadget_path = join("/sys/kernel/config/usb_gadget", config.otg.gadget)
_mkdir(gadget_path)
_write(join(gadget_path, "idVendor"), f"0x{config.otg.vendor_id:X}")
_write(join(gadget_path, "idProduct"), f"0x{config.otg.product_id:X}")
_write(join(gadget_path, "bcdDevice"), "0x0100")
_write(join(gadget_path, "bcdUSB"), "0x0200")
lang_path = join(gadget_path, "strings/0x409")
_mkdir(lang_path)
_write(join(lang_path, "manufacturer"), config.otg.manufacturer)
_write(join(lang_path, "product"), config.otg.product)
_write(join(lang_path, "serialnumber"), config.otg.serial_number)
config_path = join(gadget_path, "configs/c.1")
_mkdir(config_path)
_mkdir(join(config_path, "strings/0x409"))
_write(join(config_path, "strings/0x409/configuration"), "Config 1: ECM network")
_write(join(config_path, "MaxPower"), "250")
if config.otg.acm.enabled:
logger.info("Required ACM")
_create_acm(gadget_path, config_path)
if config.kvmd.hid.type == "otg":
logger.info("Required HID")
_create_hid(gadget_path, config_path, KEYBOARD_HID, 0)
_create_hid(gadget_path, config_path, MOUSE_HID, 1)
if config.kvmd.msd.type == "otg":
logger.info("Required MSD")
_create_msd(gadget_path, config_path, 0, cdrom=True, rw=False)
if config.otg.drives.enabled:
logger.info("Required MSD extra drives: %d", config.otg.drives.count)
for instance in range(config.otg.drives.count):
_create_msd(gadget_path, config_path, instance + 1, cdrom=False, rw=True)
logger.info("Enabling the gadget ...")
_write(join(gadget_path, "UDC"), udc)
time.sleep(config.otg.init_delay)
logger.info("Ready to work")
# =====
def _cmd_stop(config: Section) -> None:
# https://www.kernel.org/doc/Documentation/usb/gadget_configfs.txt
logger = get_logger()
_check_config(config)
gadget_path = join("/sys/kernel/config/usb_gadget", config.otg.gadget)
logger.info("Disabling gadget %r ...", config.otg.gadget)
_write(join(gadget_path, "UDC"), "")
config_path = join(gadget_path, "configs/c.1")
for func in os.listdir(config_path):
if re.search(r"\.usb\d+$", func):
_unlink(join(config_path, func))
_rmdir(join(config_path, "strings/0x409"))
_rmdir(config_path)
funcs_path = join(gadget_path, "functions")
for func in os.listdir(funcs_path):
if re.search(r"\.usb\d+$", func):
_rmdir(join(funcs_path, func))
_rmdir(join(gadget_path, "strings/0x409"))
_rmdir(gadget_path)
logger.info("Bye-bye")
# =====
def main(argv: Optional[List[str]]=None) -> None:
(parent_parser, argv, config) = init(
add_help=False,
argv=argv,
load_hid=True,
load_atx=True,
load_msd=True,
)
parser = argparse.ArgumentParser(
prog="kvmd-otg",
description="Control KVMD OTG device",
parents=[parent_parser],
)
parser.set_defaults(cmd=(lambda *_: parser.print_help()))
subparsers = parser.add_subparsers()
cmd_start_parser = subparsers.add_parser("start", help="Start OTG")
cmd_start_parser.set_defaults(cmd=_cmd_start)
cmd_stop_parser = subparsers.add_parser("stop", help="Stop OTG")
cmd_stop_parser.set_defaults(cmd=_cmd_stop)
options = parser.parse_args(argv[1:])
try:
options.cmd(config)
except ValidatorError as err:
raise SystemExit(str(err))
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