Broken patch, sorry for the noise.
> This option can be used to get a list of all known provider which
> support
> a token based authentication method.
> 
> In order to provide this feature the provider details has been
> extended
> to contain the information if a provider supports this authentication
> method or not.
> 
> Signed-off-by: Stefan Schantl <stefan.schantl(a)ipfire.org>
> ---
>  ddns.in               |  8 ++++++++
>  src/ddns/__init__.py  | 14 ++++++++++++++
>  src/ddns/providers.py | 38 ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 60 insertions(+)
>  mode change 100644 => 100755 ddns.in
> 
> diff --git a/ddns.in b/ddns.in
> old mode 100644
> new mode 100755
> index 0e377e7..40519c6
> --- a/ddns.in
> +++ b/ddns.in
> @@ -49,6 +49,10 @@ def main():
>  	p_list_providers = subparsers.add_parser("list-providers",
>  		help=_("List all available providers"))
>  
> +	# list-token-providers
> +	p_list_providers = subparsers.add_parser("list-token-
> providers",
> +		help=_("List all providers which supports
> authentication via token"))
> +
>  	# update
>  	p_update = subparsers.add_parser("update", help=_("Update DNS
> record"))
>  	p_update.add_argument("hostname")
> @@ -85,6 +89,10 @@ def main():
>  		provider_names = d.get_provider_names()
>  		print("\n".join(provider_names))
>  
> +	elif args.subparsers_name == "list-token-providers":
> +		token_provider = d.get_provider_with_token_support()
> +		print("\n".join(token_provider))
> +
>  	elif args.subparsers_name == "update":
>  		d.updateone(hostname=args.hostname, force=args.force)
>  
> diff --git a/src/ddns/__init__.py b/src/ddns/__init__.py
> index 3e43fa7..ca232bf 100644
> --- a/src/ddns/__init__.py
> +++ b/src/ddns/__init__.py
> @@ -86,6 +86,20 @@ class DDNSCore(object):
>  		"""
>  		return sorted(self.providers.keys())
>  
> +	def get_provider_with_token_support(self):
> +		"""
> +			Returns a list with names of all registered
> providers
> +			which support token based authtentication.
> +		"""
> +
> +		token_provider = []
> +
> +		for handle, provider in sorted(self.providers.items()):
> +			if provider.supports_token_auth is True:
> +				token_provider.append(handle)
> +
> +		return sorted(token_provider)
> +
>  	def load_configuration(self, filename):
>  		logger.debug(_("Loading configuration file %s") %
> filename)
>  
> diff --git a/src/ddns/providers.py b/src/ddns/providers.py
> index a1ca3f3..b0066d5 100644
> --- a/src/ddns/providers.py
> +++ b/src/ddns/providers.py
> @@ -73,6 +73,10 @@ class DDNSProvider(object):
>  	# Required to remove AAAA records if IPv6 is absent again.
>  	can_remove_records = True
>  
> +	# True if the provider supports authentication via a random
> +	# generated token instead of username and password.
> +	supports_token_auth = True
> +
>  	@staticmethod
>  	def supported():
>  		"""
> @@ -352,6 +356,10 @@ class DDNSProtocolDynDNS2(object):
>  	# The DynDNS protocol version 2 does not allow to remove
> records
>  	can_remove_records = False
>  
> +	# The DynDNS protocol version 2 only supports authentication
> via
> +	# username and password.
> +	supports_token_auth = False
> +
>  	def prepare_request_data(self, proto):
>  		data = {
>  			"hostname" : self.hostname,
> @@ -440,6 +448,7 @@ class DDNSProviderAllInkl(DDNSProvider):
>  
>  	url = "http://dyndns.kasserver.com"
>  	can_remove_records = False
> +	supports_token_auth = False
>  
>  	def update(self):
>  		# There is no additional data required so we directly
> can
> @@ -464,6 +473,8 @@ class DDNSProviderBindNsupdate(DDNSProvider):
>  
>  	DEFAULT_TTL = 60
>  
> +	supports_token_auth = False
> +
>  	@staticmethod
>  	def supported():
>  		# Search if the nsupdate utility is available
> @@ -550,6 +561,7 @@ class DDNSProviderChangeIP(DDNSProvider):
>  
>  	url = "https://nic.changeip.com/nic/update"
>  	can_remove_records = False
> +	supports_token_auth = False
>  
>  	def update_protocol(self, proto):
>  		data = {
> @@ -616,6 +628,7 @@ class DDNSProviderDDNSS(DDNSProvider):
>  
>  	url = "http://www.ddnss.de/upd.php"
>  	can_remove_records = False
> +	supports_token_auth = False
>  
>  	def update_protocol(self, proto):
>  		data = {
> @@ -678,6 +691,7 @@ class DDNSProviderDHS(DDNSProvider):
>  
>  	url = "http://members.dhs.org/nic/hosts"
>  	can_remove_records = False
> +	supports_token_auth = False
>  
>  	def update_protocol(self, proto):
>  		data = {
> @@ -710,6 +724,7 @@ class DDNSProviderDNSpark(DDNSProvider):
>  
>  	url = "https://control.dnspark.com/api/dynamic/update.php"
>  	can_remove_records = False
> +	supports_token_auth = False
>  
>  	def update_protocol(self, proto):
>  		data = {
> @@ -758,6 +773,7 @@ class DDNSProviderDtDNS(DDNSProvider):
>  
>  	url = "https://www.dtdns.com/api/autodns.cfm"
>  	can_remove_records = False
> +	supports_token_auth = False
>  
>  	def update_protocol(self, proto):
>  		data = {
> @@ -813,6 +829,7 @@ class DDNSProviderDuckDNS(DDNSProvider):
>  
>  	url = "https://www.duckdns.org/update"
>  	can_remove_records = False
> +	supports_token_auth = True
>  
>  	def update(self):
>  		# Raise an error if no auth details are given.
> @@ -914,6 +931,7 @@ class DDNSProviderDynUp(DDNSProvider):
>  
>  	url = "https://dynup.de/dyn.php"
>  	can_remove_records = False
> +	supports_token_auth = False
>  
>  	def update_protocol(self, proto):
>  		data = {
> @@ -979,6 +997,8 @@ class DDNSProviderEasyDNS(DDNSProvider):
>  
>  	url = "http://api.cp.easydns.com/dyn/tomato.php"
>  
> +	supports_token_auth = False
> +
>  	def update_protocol(self, proto):
>  		data = {
>  			"myip"     : self.get_address(proto, "-"),
> @@ -1032,6 +1052,7 @@ class DDNSProviderDynsNet(DDNSProvider):
>  	website   = "http://www.dyns.net/"
>  	protocols = ("ipv4",)
>  	can_remove_records = False
> +	supports_token_auth = False
>  
>  	# There is very detailed informatio about how to send the
> update request and
>  	# the possible response codes. (Currently we are using the v1.1
> proto)
> @@ -1083,6 +1104,7 @@ class
> DDNSProviderEnomCom(DDNSResponseParserXML, DDNSProvider):
>  
>  	url = "https://dynamic.name-services.com/interface.asp"
>  	can_remove_records = False
> +	supports_token_auth = False
>  
>  	def update_protocol(self, proto):
>  		data = {
> @@ -1125,6 +1147,7 @@ class DDNSProviderEntryDNS(DDNSProvider):
>  	# here: https://entrydns.net/help
>  	url = "https://entrydns.net/records/modify"
>  	can_remove_records = False
> +	supports_token_auth = True
>  
>  	def update_protocol(self, proto):
>  		data = {
> @@ -1165,6 +1188,7 @@ class
> DDNSProviderFreeDNSAfraidOrg(DDNSProvider):
>  	# page. All used values have been collected by testing.
>  	url = "https://freedns.afraid.org/dynamic/update.php"
>  	can_remove_records = False
> +	supports_token_auth = True
>  
>  	def update_protocol(self, proto):
>  		data = {
> @@ -1246,6 +1270,7 @@ class DDNSProviderKEYSYSTEMS(DDNSProvider):
>  
>  	url = "https://dynamicdns.key-systems.net/update.php"
>  	can_remove_records = False
> +	supports_token_auth = False
>  
>  	def update_protocol(self, proto):
>  		address = self.get_address(proto)
> @@ -1297,6 +1322,8 @@ class
> DDNSProviderLightningWireLabs(DDNSProvider):
>  	# Information about the format of the HTTPS request is to be
> found
>  	# https://dns.lightningwirelabs.com/knowledge-base/api/ddns
>  
> +	supports_token_auth = True
> +
>  	url = "https://dns.lightningwirelabs.com/update"
>  
>  	def update(self):
> @@ -1365,6 +1392,7 @@ class
> DDNSProviderNamecheap(DDNSResponseParserXML, DDNSProvider):
>  
>  	url = "https://dynamicdns.park-your-domain.com/update"
>  	can_remove_records = False
> +	supports_token_auth = False
>  
>  	def update_protocol(self, proto):
>  		# Namecheap requires the hostname splitted into a host
> and domain part.
> @@ -1458,6 +1486,8 @@ class
> DDNSProviderNsupdateINFO(DDNSProtocolDynDNS2, DDNSProvider):
>  	# has not been implemented here, yet.
>  	can_remove_records = False
>  
> +	supports_token_auth = True
> +
>  	# After a failed update, there will be no retries
>  	# https://bugzilla.ipfire.org/show_bug.cgi?id=10603
>  	holdoff_failure_days = None
> @@ -1534,6 +1564,7 @@ class DDNSProviderRegfish(DDNSProvider):
>  
>  	url = "https://dyndns.regfish.de/"
>  	can_remove_records = False
> +	supports_token_auth = True
>  
>  	def update(self):
>  		data = {
> @@ -1630,6 +1661,7 @@ class DDNSProviderServercow(DDNSProvider):
>  
>  	url = "https://www.servercow.de/dnsupdate/update.php"
>  	can_remove_records = False
> +	supports_token_auth = False
>  
>  	def update_protocol(self, proto):
>  		data = {
> @@ -1671,6 +1703,8 @@ class DDNSProviderSPDNS(DDNSProtocolDynDNS2,
> DDNSProvider):
>  
>  	url = "https://update.spdyn.de/nic/update"
>  
> +	supports_token_auth = True
> +
>  	@property
>  	def username(self):
>  		return self.get("username") or self.hostname
> @@ -1774,6 +1808,8 @@ class DDNSProviderZoneedit(DDNSProvider):
>  	website   = "http://www.zoneedit.com"
>  	protocols = ("ipv4",)
>  
> +	supports_token_auth = False
> +
>  	# Detailed information about the request and the response codes
> can be
>  	# obtained here:
>  	# http://www.zoneedit.com/doc/api/other.html
> @@ -1821,6 +1857,7 @@ class DDNSProviderDNSmadeEasy(DDNSProvider):
>  
>  	url = "https://cp.dnsmadeeasy.com/servlet/updateip?"
>  	can_remove_records = False
> +	supports_token_auth = False
>  
>  	def update_protocol(self, proto):
>  		data = {
> @@ -1871,6 +1908,7 @@ class DDNSProviderZZZZ(DDNSProvider):
>  
>  	url = "https://zzzz.io/api/v1/update"
>  	can_remove_records = False
> +	supports_token_auth = True
>  
>  	def update_protocol(self, proto):
>  		data = {