X-Git-Url: https://git.toastfreeware.priv.at/toast/tdyndns.git/blobdiff_plain/2c1037c4fe9bd6282161b1d46c45140b79d2c627..25ea32904b9ca333a10d45d3a68f822a64505737:/bin/nsupdate_dyndns

diff --git a/bin/nsupdate_dyndns b/bin/nsupdate_dyndns
index dd9d5f0..4452fe0 100755
--- a/bin/nsupdate_dyndns
+++ b/bin/nsupdate_dyndns
@@ -1,9 +1,83 @@
-#!/bin/bash
+#!/usr/bin/python
+import sys
+import re
+import argparse
+from subprocess import Popen, PIPE
+import ipaddr
 
-hostname=$1
-myip=$2
-type=$3 # A or AAAA
-ttl=600
-domain=dyn.colgarra.priv.at
 
-echo -e "update delete $hostname.$domain $type\nupdate add $hostname.$domain $ttl IN $type $myip\n" | nsupdate -l
+class NsupdateError(Exception):
+	def __init__(self, returncode):
+		self.returncode = returncode
+
+
+def ipfamily_by_ip(ip):
+	if isinstance(ip, ipaddr.IPv4Address):
+		return 'A'
+	elif isinstance(ip, ipaddr.IPv6Address):
+		return 'AAAA'
+	assert False
+
+
+def nsupdate_add(fqdn, ttl, ip):
+	"""
+	:param fqdn: Fully qualified domain name
+	:param ip_family: A or AAAA
+	:raises an NsupdateError in case of errors."""
+	command = "update add {fqdn} {ttl} IN {ip_family} {ip}\n\n".format(fqdn=fqdn, ttl=ttl, ip_family=ipfamily_by_ip(ip), ip=ip)
+	p = Popen(['nsupdate', '-l'], stdin=PIPE)
+	p.communicate(command)
+	if p.returncode != 0:
+		raise NsupdateError(p.returncode)
+
+
+def nsupdate_delete(fqdn, ip_family):
+	"""
+	:param fqdn: Fully qualified domain name
+	:param ip_family: A or AAAA
+	:raises an NsupdateError in case of errors."""
+	command = "update delete {fqdn} {ip_family}\n\n".format(fqdn=fqdn, ip_family=ip_family)
+	p = Popen(['nsupdate', '-l'], stdin=PIPE)
+	p.communicate(command)
+	if p.returncode != 0:
+		raise NsupdateError(p.returncode)
+
+
+def main(args):
+	try:
+		if args.delete:
+			if args.ip is None:
+				nsupdate_delete(args.fqdn, 'A')
+				nsupdate_delete(args.fqdn, 'AAAA')
+			else:
+				nsupdate_delete(args.fqdn, ipfamily_by_ip(args.ip))
+		else:
+			nsupdate_delete(args.fqdn, ipfamily_by_ip(args.ip))
+			nsupdate_add(args.fqdn, args.ttl, args.ip)
+	except NsupdateError as e:
+		sys.exit(e.returncode)
+
+
+
+if __name__ == '__main__':
+	parser = argparse.ArgumentParser(description='Add or delete a domain name from dyndns (simplifies call to nsupdate).')
+	parser.add_argument('-d', '--delete', action='store_true', help='delete instead of add')
+	parser.add_argument('-i', '--ip', help='IP address (either IPv4 or IPv6)')
+	parser.add_argument('-t', '--ttl', type=int, default=600, help='TTL (default: 600)')
+	parser.add_argument('fqdn', help='fully qualified domain name to add or delete, e.g. myserver.dyn.example.com')
+	args = parser.parse_args()
+
+	# check ip
+	if not args.delete and not args.ip:
+		parser.error('The IP address is mandatory')
+	if args.ip:
+		try:
+			args.ip = ipaddr.IPAddress(args.ip) # throws an exception if the IP address is not valid
+		except ValueError:
+			parser.error('The IP address is not valid')
+
+	# check fqdn
+	if re.match(r'[-0-9a-z]+(\.[-0-9a-z]+)*$', args.fqdn) is None:
+		parser.error('The fqdn has an invalid format.')
+
+	main(args)