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# -*- coding: utf-8 -*-
#
# AWL simulator - networking utility functions
#
# Copyright 2013-2018 Michael Buesch <m@bues.ch>
#
# 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 2 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
from __future__ import division, absolute_import, print_function, unicode_literals
#from awlsim.common.cython_support cimport * #@cy
from awlsim.common.compat import *
from awlsim.common.util import *
from awlsim.common.exceptions import *
import socket
import os
__all__ = [
"AF_UNIX",
"SocketErrors",
"netGetAddrInfo",
"netPortIsUnused",
]
if hasattr(socket, "AF_UNIX"): #@nocov
AF_UNIX = socket.AF_UNIX
else: #@nocov
AF_UNIX = None
SocketErrors = (socket.error if hasattr(socket, "error") else OSError,
BlockingIOError,
ConnectionError)
def netGetAddrInfo(host, port, family = None):
"""getaddrinfo() wrapper.
"""
socktype = socket.SOCK_STREAM
if family in {None, socket.AF_UNSPEC}:
# First try IPv4
try:
family, socktype, proto, canonname, sockaddr =\
socket.getaddrinfo(host, port,
socket.AF_INET,
socktype)[0]
except socket.gaierror as e:
if excErrno(e) == socket.EAI_ADDRFAMILY:
# Also try IPv6
family, socktype, proto, canonname, sockaddr =\
socket.getaddrinfo(host, port,
socket.AF_INET6,
socktype)[0]
else:
raise e
else:
family, socktype, proto, canonname, sockaddr =\
socket.getaddrinfo(host, port,
family,
socktype)[0]
return (family, socktype, sockaddr)
def netPortIsUnused(host, port):
"""Check if a port is not used.
"""
sock = None
_SocketErrors = SocketErrors
try:
family, socktype, sockaddr = netGetAddrInfo(host, port)
if family == AF_UNIX:
if not os.path.exists(sockaddr):
return True
return False
sock = socket.socket(family, socktype)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind(sockaddr)
except _SocketErrors as e:
return False
finally:
if sock:
with suppressAllExc:
if hasattr(sock, "shutdown"):
sock.shutdown(socket.SHUT_RDWR)
with suppressAllExc:
sock.close()
return True
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