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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 socket
import errno
# =====
def is_ipv6_enabled() -> bool:
if not socket.has_ipv6:
# If the socket library has no support for IPv6,
# then the question is moot as we can't use IPv6 anyways.
return False
try:
with socket.socket(socket.AF_INET6, socket.SOCK_STREAM) as sock:
sock.bind(("::1", 0))
return True
except OSError as err:
if err.errno in [errno.EADDRNOTAVAIL, errno.EAFNOSUPPORT]:
return False
if err.errno == errno.EADDRINUSE:
return True
raise
def get_listen_host(host: str) -> str:
if len(host) == 0:
return ("::" if is_ipv6_enabled() else "0.0.0.0")
return host
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