From e4b8753c82ea18479ced869ba96d17e44c84da46 Mon Sep 17 00:00:00 2001
From: Philipp Spitzer <philipp@spitzer.priv.at>
Date: Wed, 5 Mar 2014 23:59:47 +0100
Subject: [PATCH] Implemented offline parameter.

---
 cgi-bin/dyndns.py | 50 ++++++++++++++++++++++++++++++++---------------
 1 file changed, 34 insertions(+), 16 deletions(-)

diff --git a/cgi-bin/dyndns.py b/cgi-bin/dyndns.py
index 8291ac2..95fcfda 100755
--- a/cgi-bin/dyndns.py
+++ b/cgi-bin/dyndns.py
@@ -66,15 +66,18 @@ class HostnameMissing(HostnameError):
 class PasswordWrong(HostnameError):
 	pass
 
-class IpError(DynDnsError):
+class MyipError(DynDnsError):
 	returncode = 'badip' # not documented at dyn.com
 
-class IpMissing(IpError):
+class MyipMissing(MyipError):
 	pass
 
-class IpInvalid(IpError):
+class MyipInvalid(MyipError):
 	pass
 
+class OfflineInvalid(DynDnsError):
+	returncode = 'badparam' # not documented at dyn.com
+
 try:
 	# check username
 	if username is None:
@@ -103,24 +106,39 @@ try:
 	if hostname.endswith(ZONE):
 		hostname = hostname[:-len(ZONE)]
 
+	# check offline
+	if offline is None or offline.lower() == 'no':
+		offline = False
+	elif offline.lower() == 'yes':
+		offline = True
+	else:
+		raise OfflineInvalid()
+
 	# check IP address
-	if myip is None:
-		raise IpMissing()
-	try:
-		ip = ipaddr.IPAddress(myip) # throws an exception if the IP address is not valid
-	except ValueError:
-		raise IpInvalid()
-	if isinstance(ip, ipaddr.IPv4Address):
-		iptype = 'A'
-	elif isinstance(ip, ipaddr.IPv6Address):
-		iptype = 'AAAA'
+	if not offline:
+		if myip is None:
+			raise MyipMissing()
+		try:
+			ip = ipaddr.IPAddress(myip) # throws an exception if the IP address is not valid
+		except ValueError:
+			raise MyipInvalid()
+		if isinstance(ip, ipaddr.IPv4Address):
+			iptype = 'A'
+		elif isinstance(ip, ipaddr.IPv6Address):
+			iptype = 'AAAA'
+		else:
+			raise MyipInvalid() # should never happen
+
+	# update bind
+	if offline:
+		call(['sudo', '/usr/local/bin/nsupdate_dyndns_del', hostname, 'A'])
+		call(['sudo', '/usr/local/bin/nsupdate_dyndns_del', hostname, 'AAAA'])
 	else:
-		raise IpInvalid() # should never happen
+		call(['sudo', '/usr/local/bin/nsupdate_dyndns', hostname, myip, iptype])
 
-	# access granted
+	# return success
 	print "Content-Type: text/html"
 	print
-	call(['sudo', '/usr/local/bin/nsupdate_dyndns', hostname, myip, iptype])
 	print "good"
 	# Note: we should return 'nochg' in case the IP has not changed, however we don't know yet.
 
-- 
2.39.5