5:12 a.m.
From: Ondrej Lichtner <olichtne(a)redhat.com>
Defines BaseIpAddress and derived classes and the IpAddress factory
method. We define our own instead of using the ipaddress module because
it doesn't always fit how LNST works and would require workarounds.
Defining our own classes for ip address handling therefore simplifies
our code.
Signed-off-by: Ondrej Lichtner <olichtne(a)redhat.com>
---
v2:
* modify exception string.
---
lnst/Common/IpAddress.py | 99 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 99 insertions(+)
create mode 100644 lnst/Common/IpAddress.py
diff --git a/lnst/Common/IpAddress.py b/lnst/Common/IpAddress.py
new file mode 100644
index 0000000..0bb5bec
--- /dev/null
+++ b/lnst/Common/IpAddress.py
@@ -0,0 +1,99 @@
+"""
+Defines BaseIpAddress and derived classes and the IpAddress factory method.
+
+Copyright 2017 Red Hat, Inc.
+Licensed under the GNU General Public License, version 2 as
+published by the Free Software Foundation; see COPYING for details.
+"""
+
+__author__ = """
+olichtne(a)redhat.com (Ondrej Lichtner)
+"""
+
+import re
+from socket import inet_pton, AF_INET, AF_INET6
+from lnst.Common.LnstError import LnstError
+
+class BaseIpAddress(object):
+ def __init__(self, addr):
+ self.addr, self.prefixlen = self._parse_addr(addr)
+
+ self.family = None
+
+ def __str__(self):
+ return str(self.addr)
+
+ def __eq__(self, other):
+ if self.addr != other.addr or\
+ self.prefixlen != other.prefixlen:
+ return False
+ else:
+ return True
+
+ @staticmethod
+ def _parse_addr(addr):
+ raise NotImplementedError()
+
+class Ip4Address(BaseIpAddress):
+ def __init__(self, addr):
+ super(Ip4Address, self).__init__(addr)
+
+ self.family = AF_INET
+
+ @staticmethod
+ def _parse_addr(addr):
+ addr = addr.split('/')
+ if len(addr) == 1:
+ addr = addr[0]
+ prefixlen = 32
+ elif len(addr) == 2:
+ addr, prefixlen = addr
+ prefixlen = int(prefixlen)
+ else:
+ raise LnstError("Invalid IPv4 format.")
+
+ try:
+ inet_pton(AF_INET, addr)
+ except:
+ raise LnstError("Invalid IPv4 format.")
+
+ return addr, prefixlen
+
+class Ip6Address(BaseIpAddress):
+ def __init__(self, addr):
+ super(Ip6Address, self).__init__(addr)
+
+ self.family = AF_INET6
+
+ @staticmethod
+ def _parse_addr(addr):
+ addr = addr.split('/')
+ if len(addr) == 1:
+ addr = addr[0]
+ prefixlen = 128
+ elif len(addr) == 2:
+ addr, prefixlen = addr
+ prefixlen = int(prefixlen)
+ else:
+ raise LnstError("Invalid IPv6 format.")
+
+ try:
+ type(inet_pton(AF_INET6, addr))
+ except:
+ raise LnstError("Invalid IPv6 format.")
+
+ return addr, prefixlen
+
+def IpAddress(addr):
+ """Factory method to create a BaseIpAddress object"""
+ if isinstance(addr, BaseIpAddress):
+ return addr
+ #TODO add switches for host, interface etc...
+ elif isinstance(addr, str):
+ try:
+ return Ip4Address(addr)
+ except:
+ return Ip6Address(addr)
+ else:
+ raise LnstError("Value must be a BaseIpAddress or string object."
+ "Not {}".format(type(addr)))
--
2.13.0