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# Copyright (C) 2015 Nippon Telegraph and Telephone Corporation.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import numbers
import struct
import netaddr
from ryu.lib import addrconv
from ryu.lib import type_desc
def _valid_ip(strategy, bits, addr, flags=0):
addr = addr.split('/')
if len(addr) == 1:
return strategy(addr[0], flags)
elif len(addr) == 2:
return strategy(addr[0], flags) and 0 <= int(addr[1]) <= bits
else:
return False
def valid_ipv4(addr, flags=0):
"""
Wrapper function of "netaddr.valid_ipv4()".
The function extends "netaddr.valid_ipv4()" to enable to validate
IPv4 network address in "xxx.xxx.xxx.xxx/xx" format.
:param addr: IP address to be validated.
:param flags: See the "netaddr.valid_ipv4()" docs for details.
:return: True is valid. False otherwise.
"""
return _valid_ip(netaddr.valid_ipv4, 32, addr, flags)
def valid_ipv6(addr, flags=0):
"""
Wrapper function of "netaddr.valid_ipv6()".
The function extends "netaddr.valid_ipv6()" to enable to validate
IPv4 network address in "xxxx:xxxx:xxxx::/xx" format.
:param addr: IP address to be validated.
:param flags: See the "netaddr.valid_ipv6()" docs for details.
:return: True is valid. False otherwise.
"""
return _valid_ip(netaddr.valid_ipv6, 128, addr, flags)
def ipv4_to_bin(ip):
"""
Converts human readable IPv4 string to binary representation.
:param str ip: IPv4 address string
:return: binary representation of IPv4 address
"""
return addrconv.ipv4.text_to_bin(ip)
def ipv4_to_int(ip):
"""
Converts human readable IPv4 string to int type representation.
:param str ip: IPv4 address string w.x.y.z
:returns: unsigned int of form w << 24 | x << 16 | y << 8 | z
"""
return struct.unpack("!I", addrconv.ipv4.text_to_bin(ip))[0]
def ipv4_to_str(ip):
"""
Converts binary or int type representation to human readable IPv4 string.
:param ip: binary or int type representation of IPv4 address
:return: IPv4 address string
"""
if isinstance(ip, int):
return addrconv.ipv4.bin_to_text(struct.pack("!I", ip))
else:
return addrconv.ipv4.bin_to_text(ip)
def ipv6_to_bin(ip):
"""
Converts human readable IPv6 string to binary representation.
:param str ip: IPv6 address string
:return: binary representation of IPv6 address
"""
return addrconv.ipv6.text_to_bin(ip)
def ipv6_to_int(ip):
"""
Converts human readable IPv6 string to int type representation.
:param str ip: IPv6 address string
:returns: int type representation of IPv6 address
"""
return type_desc.Int16.to_user(addrconv.ipv6.text_to_bin(ip))
def ipv6_to_str(ip):
"""
Converts binary or int type representation to human readable IPv6 string.
:param ip: binary or int type representation of IPv6 address
:return: IPv6 address string
"""
if isinstance(ip, numbers.Integral):
return addrconv.ipv6.bin_to_text(type_desc.Int16.from_user(ip))
else:
return addrconv.ipv6.bin_to_text(ip)
def text_to_bin(ip):
"""
Converts human readable IPv4 or IPv6 string to binary representation.
:param str ip: IPv4 or IPv6 address string
:return: binary representation of IPv4 or IPv6 address
"""
if ':' not in ip:
return ipv4_to_bin(ip)
else:
return ipv6_to_bin(ip)
def text_to_int(ip):
"""
Converts human readable IPv4 or IPv6 string to int type representation.
:param str ip: IPv4 or IPv6 address string
:return: int type representation of IPv4 or IPv6 address
"""
if ':' not in ip:
return ipv4_to_int(ip)
else:
return ipv6_to_int(ip)
def bin_to_text(ip):
"""
Converts binary representation to human readable IPv4 or IPv6 string.
:param ip: binary representation of IPv4 or IPv6 address
:return: IPv4 or IPv6 address string
"""
if len(ip) == 4:
return ipv4_to_str(ip)
elif len(ip) == 16:
return ipv6_to_str(ip)
else:
raise struct.error('Invalid ip address length: %s' % len(ip))
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