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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/>. #
# #
# ========================================================================== #
# =====
class BaseCtl:
def get_command(self, direct: bool) -> list[str]:
raise NotImplementedError
class IfaceUpCtl(BaseCtl):
def __init__(self, base_cmd: list[str], iface: str) -> None:
self.__base_cmd = base_cmd
self.__iface = iface
def get_command(self, direct: bool) -> list[str]:
return [*self.__base_cmd, "link", "set", self.__iface, ("up" if direct else "down")]
class IfaceAddIpCtl(BaseCtl):
def __init__(self, base_cmd: list[str], iface: str, cidr: str) -> None:
self.__base_cmd = base_cmd
self.__iface = iface
self.__cidr = cidr
def get_command(self, direct: bool) -> list[str]:
return [*self.__base_cmd, "address", ("add" if direct else "del"), self.__cidr, "dev", self.__iface]
class IptablesAllowEstRelCtl(BaseCtl):
def __init__(self, base_cmd: list[str], iface: str) -> None:
self.__base_cmd = base_cmd
self.__iface = iface
def get_command(self, direct: bool) -> list[str]:
return [
*self.__base_cmd,
("-A" if direct else "-D"), "INPUT", "-i", self.__iface,
"-m", "state", "--state", "ESTABLISHED,RELATED", "-j", "ACCEPT",
]
class IptablesDropAllCtl(BaseCtl):
def __init__(self, base_cmd: list[str], iface: str) -> None:
self.__base_cmd = base_cmd
self.__iface = iface
def get_command(self, direct: bool) -> list[str]:
return [*self.__base_cmd, ("-A" if direct else "-D"), "INPUT", "-i", self.__iface, "-j", "DROP"]
class IptablesAllowIcmpCtl(BaseCtl):
def __init__(self, base_cmd: list[str], iface: str) -> None:
self.__base_cmd = base_cmd
self.__iface = iface
def get_command(self, direct: bool) -> list[str]:
return [
*self.__base_cmd,
("-A" if direct else "-D"), "INPUT", "-i", self.__iface, "-p", "icmp", "-j", "ACCEPT",
]
class IptablesAllowPortCtl(BaseCtl):
def __init__(self, base_cmd: list[str], iface: str, port: int, tcp: bool) -> None:
self.__base_cmd = base_cmd
self.__iface = iface
self.__port = port
self.__proto = ("tcp" if tcp else "udp")
def get_command(self, direct: bool) -> list[str]:
return [
*self.__base_cmd,
("-A" if direct else "-D"), "INPUT", "-i", self.__iface, "-p", self.__proto,
"--dport", str(self.__port), "-j", "ACCEPT",
]
class IptablesForwardOut(BaseCtl):
def __init__(self, base_cmd: list[str], iface: str) -> None:
self.__base_cmd = base_cmd
self.__iface = iface
def get_command(self, direct: bool) -> list[str]:
return [
*self.__base_cmd,
"--table", "nat",
("-A" if direct else "-D"), "POSTROUTING",
"-o", self.__iface, "-j", "MASQUERADE",
]
class IptablesForwardIn(BaseCtl):
def __init__(self, base_cmd: list[str], iface: str) -> None:
self.__base_cmd = base_cmd
self.__iface = iface
def get_command(self, direct: bool) -> list[str]:
return [
*self.__base_cmd,
("-A" if direct else "-D"), "FORWARD",
"-i", self.__iface, "-j", "ACCEPT",
]
class CustomCtl(BaseCtl):
def __init__(
self,
direct_cmd: list[str],
reverse_cmd: list[str],
placeholders: dict[str, str],
) -> None:
self.__direct_cmd = direct_cmd
self.__reverse_cmd = reverse_cmd
self.__placeholders = placeholders
def get_command(self, direct: bool) -> list[str]:
return [
part.format(**self.__placeholders)
for part in (self.__direct_cmd if direct else self.__reverse_cmd)
]
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