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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2023 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 asyncio
import ipaddress
import dataclasses
import itertools
import argparse
from ...logging import get_logger
from ...yamlconf import Section
from ... import tools
from ... import aioproc
from ... import usb
from .. import init
from .netctl import BaseCtl
from .netctl import IfaceUpCtl
from .netctl import IfaceAddIpCtl
from .netctl import IptablesAllowEstRelCtl
from .netctl import IptablesDropAllCtl
from .netctl import IptablesAllowIcmpCtl
from .netctl import IptablesAllowPortCtl
from .netctl import IptablesForwardOut
from .netctl import IptablesForwardIn
from .netctl import CustomCtl
# =====
@dataclasses.dataclass(frozen=True)
class _Netcfg: # pylint: disable=too-many-instance-attributes
iface: str
iface_ip: str
net_ip: str
net_prefix: int
net_mask: str
dhcp_ip_begin: str
dhcp_ip_end: str
dhcp_option_3: str
class _Service: # pylint: disable=too-many-instance-attributes
def __init__(self, config: Section) -> None:
self.__iface_net: str = config.otgnet.iface.net
self.__ip_cmd: list[str] = config.otgnet.iface.ip_cmd
self.__allow_icmp: bool = config.otgnet.firewall.allow_icmp
self.__allow_tcp: list[int] = sorted(set(config.otgnet.firewall.allow_tcp))
self.__allow_udp: list[int] = sorted(set(config.otgnet.firewall.allow_udp))
self.__forward_iface: str = config.otgnet.firewall.forward_iface
self.__iptables_cmd: list[str] = config.otgnet.firewall.iptables_cmd
def build_cmd(key: str) -> list[str]:
return tools.build_cmd(
getattr(config.otgnet.commands, key),
getattr(config.otgnet.commands, f"{key}_remove"),
getattr(config.otgnet.commands, f"{key}_append"),
)
self.__pre_start_cmd: list[str] = build_cmd("pre_start_cmd")
self.__post_start_cmd: list[str] = build_cmd("post_start_cmd")
self.__pre_stop_cmd: list[str] = build_cmd("pre_stop_cmd")
self.__post_stop_cmd: list[str] = build_cmd("post_stop_cmd")
self.__gadget: str = config.otg.gadget
self.__driver: str = config.otg.devices.ethernet.driver
def start(self) -> None:
asyncio.run(self.__run(True))
def stop(self) -> None:
asyncio.run(self.__run(False))
async def __run(self, direct: bool) -> None:
netcfg = self.__make_netcfg()
placeholders = {
key: str(value)
for (key, value) in dataclasses.asdict(netcfg).items()
}
ctls: list[BaseCtl] = [
CustomCtl(self.__pre_start_cmd, self.__post_stop_cmd, placeholders),
IfaceUpCtl(self.__ip_cmd, netcfg.iface),
IptablesAllowEstRelCtl(self.__iptables_cmd, netcfg.iface),
*([IptablesAllowIcmpCtl(self.__iptables_cmd, netcfg.iface)] if self.__allow_icmp else []),
*[
IptablesAllowPortCtl(self.__iptables_cmd, netcfg.iface, port, tcp)
for (port, tcp) in [
*zip(self.__allow_tcp, itertools.repeat(True)),
*zip(self.__allow_udp, itertools.repeat(False)),
]
],
*([IptablesForwardOut(self.__iptables_cmd, self.__forward_iface)] if self.__forward_iface else []),
*([IptablesForwardIn(self.__iptables_cmd, netcfg.iface)] if self.__forward_iface else []),
IptablesDropAllCtl(self.__iptables_cmd, netcfg.iface),
IfaceAddIpCtl(self.__ip_cmd, netcfg.iface, f"{netcfg.iface_ip}/{netcfg.net_prefix}"),
CustomCtl(self.__post_start_cmd, self.__pre_stop_cmd, placeholders),
]
if direct:
for ctl in ctls:
if not (await self.__run_ctl(ctl, True)):
raise SystemExit(1)
get_logger(0).info("Ready to work")
else:
for ctl in reversed(ctls):
await self.__run_ctl(ctl, False)
get_logger(0).info("Bye-bye")
async def __run_ctl(self, ctl: BaseCtl, direct: bool) -> bool:
logger = get_logger()
cmd = ctl.get_command(direct)
logger.info("CMD: %s", tools.cmdfmt(cmd))
try:
return (not (await aioproc.log_process(cmd, logger)).returncode)
except Exception as err:
logger.exception("Can't execute command: %s", err)
return False
# =====
def __make_netcfg(self) -> _Netcfg:
iface = self.__find_iface()
logger = get_logger()
logger.info("Using IPv4 network %s ...", self.__iface_net)
net = ipaddress.IPv4Network(self.__iface_net)
if net.prefixlen > 31:
raise RuntimeError("Too small network, required at least /31")
if net.prefixlen == 31:
iface_ip = str(net[0])
dhcp_ip_begin = dhcp_ip_end = str(net[1])
else:
iface_ip = str(net[1])
dhcp_ip_begin = str(net[2])
dhcp_ip_end = str(net[-2])
netcfg = _Netcfg(
iface=iface,
iface_ip=iface_ip,
net_ip=str(net.network_address),
net_prefix=net.prefixlen,
net_mask=str(net.netmask),
dhcp_ip_begin=dhcp_ip_begin,
dhcp_ip_end=dhcp_ip_end,
dhcp_option_3=(f"3,{iface_ip}" if self.__forward_iface else "3"),
)
logger.info("Calculated %r address is %s/%d", iface, iface_ip, netcfg.net_prefix)
return netcfg
def __find_iface(self) -> str:
logger = get_logger()
real_driver = self.__driver
if self.__driver == "rndis5":
real_driver = "rndis"
path = usb.get_gadget_path(self.__gadget, usb.G_FUNCTIONS, f"{real_driver}.usb0/ifname")
logger.info("Using OTG gadget %r ...", self.__gadget)
with open(path) as file:
iface = file.read().strip()
logger.info("Using OTG Ethernet interface %r ...", iface)
assert iface
return iface
# =====
def main(argv: (list[str] | None)=None) -> None:
(parent_parser, argv, config) = init(
add_help=False,
argv=argv,
)
parser = argparse.ArgumentParser(
prog="kvmd-otgnet",
description="Control KVMD OTG network",
parents=[parent_parser],
)
parser.set_defaults(cmd=(lambda *_: parser.print_help()))
subparsers = parser.add_subparsers()
service = _Service(config)
cmd_start_parser = subparsers.add_parser("start", help="Start OTG network")
cmd_start_parser.set_defaults(cmd=service.start)
cmd_stop_parser = subparsers.add_parser("stop", help="Stop OTG network")
cmd_stop_parser.set_defaults(cmd=service.stop)
options = parser.parse_args(argv[1:])
options.cmd()
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