69 lines
2.5 KiB
Python
69 lines
2.5 KiB
Python
""" Utilities and constants related to reverse dns lookup """
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# Created on 2020.09.16
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#
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# Author: Azaria Zornberg
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#
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# Copyright 2020 Giovanni Cannata
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# Copyright 2020 Azaria Zornberg
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#
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# This file is part of ldap3.
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#
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# ldap3 is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# ldap3 is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with ldap3 in the COPYING and COPYING.LESSER files.
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# If not, see <http://www.gnu.org/licenses/>.
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import socket
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class ReverseDnsSetting(object):
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OFF = 0,
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REQUIRE_RESOLVE_ALL_ADDRESSES = 1,
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REQUIRE_RESOLVE_IP_ADDRESSES_ONLY = 2,
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OPTIONAL_RESOLVE_ALL_ADDRESSES = 3,
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OPTIONAL_RESOLVE_IP_ADDRESSES_ONLY = 4,
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SUPPORTED_VALUES = {OFF, REQUIRE_RESOLVE_ALL_ADDRESSES, REQUIRE_RESOLVE_IP_ADDRESSES_ONLY,
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OPTIONAL_RESOLVE_ALL_ADDRESSES, OPTIONAL_RESOLVE_IP_ADDRESSES_ONLY}
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def get_hostname_by_addr(addr, success_required=True):
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""" Resolve the hostname for an ip address. If success is required, raise an exception if a hostname cannot
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be resolved for the address.
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Returns the hostname resolved for the address.
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If success is not required, returns None for addresses that do not resolve to hostnames.
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"""
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try:
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return socket.gethostbyaddr(addr)[0]
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except Exception as ex:
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# if we need to succeed, just re-raise
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if success_required:
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raise
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return None
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def is_ip_addr(addr):
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"""Returns True if an address is an ipv4 address or an ipv6 address based on format. False otherwise."""
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for addr_type in [socket.AF_INET, socket.AF_INET6]:
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try:
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socket.inet_pton(addr_type, addr) # not present on python 2.7 on Windows
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return True
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except AttributeError: # not present on Windows, always valid
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if '.' in addr and any([c.isalpha() for c in addr.replace('.', '')]): # not an IPv4 address, probably an hostname
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return False
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else: # do not check for ipv6
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return True
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except OSError:
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pass
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return False
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