cdist/cdist/util/ipaddr.py

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# -*- coding: utf-8 -*-
#
# 2016 Darko Poljak (darko.poljak at gmail.com)
#
# This file is part of cdist.
#
# cdist 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.
#
# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
#
#
import socket
import logging
def resolve_target_addresses(host):
host_name = resolve_target_host_name(host)
host_fqdn = resolve_target_fqdn(host)
return (host, host_name, host_fqdn)
def resolve_target_host_name(host):
log = logging.getLogger(host)
try:
# getaddrinfo returns a list of 5-tuples:
# (family, type, proto, canonname, sockaddr)
# where sockaddr is:
# (address, port) for AF_INET,
# (address, port, flow_info, scopeid) for AF_INET6
ip_addr = socket.getaddrinfo(
host, None, type=socket.SOCK_STREAM)[0][4][0]
# gethostbyaddr returns triple
# (hostname, aliaslist, ipaddrlist)
host_name = socket.gethostbyaddr(ip_addr)[0]
log.debug("derived host_name for host \"{}\": {}".format(
host, host_name))
except (socket.gaierror, socket.herror) as e:
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log.warning("Could not derive host_name for {}"
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", $host_name will be empty. Error is: {}".format(host, e))
# in case of error provide empty value
host_name = ''
return host_name
def resolve_target_fqdn(host):
log = logging.getLogger(host)
try:
host_fqdn = socket.getfqdn(host)
log.debug("derived host_fqdn for host \"{}\": {}".format(
host, host_fqdn))
except socket.herror as e:
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log.warning("Could not derive host_fqdn for {}"
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", $host_fqdn will be empty. Error is: {}".format(host, e))
# in case of error provide empty value
host_fqdn = ''
return host_fqdn
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# check whether addr is IPv6
try:
# python 3.3+
import ipaddress
def is_ipv6(addr):
try:
return ipaddress.ip_address(addr).version == 6
except ValueError:
return False
except ImportError:
# fallback for older python versions
def is_ipv6(addr):
try:
socket.inet_aton(addr)
return False
except socket.error:
pass
try:
socket.inet_pton(socket.AF_INET6, addr)
return True
except socket.error:
pass
return False