[PATCH v2] python/semanage: Use ipaddress module instead of IPy

[Petr Lautrbach <plautrba@redhat.com>]

ipaddress python module was added to standard library in Python 3.3 -
https://docs.python.org/3/library/ipaddress.html

seobject.py was the only consumer of IPy module so this dependency is not needed
anymore.

Signed-off-by: Petr Lautrbach <plautrba@redhat.com>
---

Based on Nicolas input:

- improved the check comment
- dropped the unnecessary check

 python/semanage/seobject.py | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/python/semanage/seobject.py b/python/semanage/seobject.py
index f2a139c970bd..6e0b87f2fa3c 100644
--- a/python/semanage/seobject.py
+++ b/python/semanage/seobject.py
@@ -32,7 +32,7 @@ from semanage import *
 PROGNAME = "policycoreutils"
 import sepolicy
 import setools
-from IPy import IP
+import ipaddress
 
 try:
     import gettext
@@ -1858,15 +1858,12 @@ class nodeRecords(semanageRecords):
         if addr == "":
             raise ValueError(_("Node Address is required"))
 
-        # verify valid combination
+        # verify that (addr, mask) is either a IP address (without a mask) or a valid network mask
         if len(mask) == 0 or mask[0] == "/":
-            i = IP(addr + mask)
-            newaddr = i.strNormal(0)
-            newmask = str(i.netmask())
-            if newmask == "0.0.0.0" and i.version() == 6:
-                newmask = "::"
-
-            protocol = "ipv%d" % i.version()
+            i = ipaddress.ip_network(addr + mask)
+            newaddr = str(i.network_address)
+            newmask = str(i.netmask)
+            protocol = "ipv%d" % i.version
 
         try:
             newprotocol = self.protocol.index(protocol)
-- 
2.26.2