From 45fc3211b0ff4b451d379b89d45f4dc7e070f446 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Sat, 8 Nov 2014 22:46:50 +0100
Subject: [PATCH] validate hostnames

---
 zonemaker/zone.py | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/zonemaker/zone.py b/zonemaker/zone.py
index 5e83854..8e87f6e 100644
--- a/zonemaker/zone.py
+++ b/zonemaker/zone.py
@@ -1,10 +1,19 @@
-import ipaddress
+import ipaddress, re
 
 second = 1
 minute = 60*second
 hour = 60*minute
 day = 24*hour
 
+def hostname(name):
+    # check hostname for validity
+    label = r'[a-zA-Z90-9]([a-zA-Z90-9-]{0,61}[a-zA-Z90-9])?' # must not start or end with hyphen
+    pattern = r'^{0}(\.{0})*\.?'.format(label)
+    print(pattern)
+    if re.match(pattern, name):
+        return name
+    raise Exception(name+" is not a valid hostname")
+
 class Address:
     def __init__(self, IPv4 = None, IPv6 = None):
         self._IPv4 = None if IPv4 is None else ipaddress.IPv4Address(IPv4)
@@ -38,6 +47,17 @@ class Zone:
                  secondary_refresh, secondary_retry, secondary_discard,
                  NX_TTL = None, A_TTL = None, other_TTL = None,
                  domains = []):
+        self._name = hostname(name)
+        assert mail.endswith('.'), "Mail must be absolute, end with a dot"
+        atpos = mail.find('@')
+        assert atpos >= 0 and atpos < mail.find('.'), "Mail must contain an @ before the first dot"
+        self._mail = hostname(mail.replace('@', '.', 1))
+        self._NS = list(map(hostname, NS))
+        
+        self._secondary_refresh = secondary_refresh
+        self._secondary_retry = secondary_retry
+        self._secondary_discard = secondary_discard
+        
         assert other_TTL is not None
         self._NX_TTL = other_TTL if NX_TTL is None else NX_TTL
         self._A_TTL = other_TTL if A_TTL is None else A_TTL
-- 
2.30.2