From fb027663d9d19ad70149714fb002ea37c5a13d65 Mon Sep 17 00:00:00 2001
From: Pieter Lexis <pieter.lexis@powerdns.com>
Date: Thu, 11 Jun 2020 10:50:16 +0200
Subject: [PATCH] tests: detect IPv6

---
 .../recursortests.py                            | 17 ++++++++++++++++-
 regression-tests.recursor-dnssec/test_ECS.py    |  6 ++++--
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/regression-tests.recursor-dnssec/recursortests.py b/regression-tests.recursor-dnssec/recursortests.py
index a918981038..e321d22fd9 100644
--- a/regression-tests.recursor-dnssec/recursortests.py
+++ b/regression-tests.recursor-dnssec/recursortests.py
@@ -15,6 +15,21 @@ import dns.message
 
 from eqdnsmessage import AssertEqualDNSMessageMixin
 
+
+def have_ipv6():
+    """
+    Try to make an IPv6 socket and bind it, if it fails, no ipv6...
+    """
+    try:
+        sock = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
+        sock.bind(('::1', 56581))
+        sock.close()
+        return True
+    except:
+        return False
+    return False
+
+
 class RecursorTest(AssertEqualDNSMessageMixin, unittest.TestCase):
     """
     Setup all recursors and auths required for the tests
@@ -499,7 +514,7 @@ distributor-threads={threads}""".format(confdir=confdir,
         authcmd = list(cls._auth_cmd)
         authcmd.append('--config-dir=%s' % confdir)
         authcmd.append('--local-address=%s' % ipaddress)
-        if (confdir[-4:] == "ROOT"):
+        if (confdir[-4:] == "ROOT") and have_ipv6():
             authcmd.append('--local-ipv6=::1')
         else:
             authcmd.append('--local-ipv6=')
diff --git a/regression-tests.recursor-dnssec/test_ECS.py b/regression-tests.recursor-dnssec/test_ECS.py
index a4bdfffd20..d1b80505fa 100644
--- a/regression-tests.recursor-dnssec/test_ECS.py
+++ b/regression-tests.recursor-dnssec/test_ECS.py
@@ -5,7 +5,8 @@ import struct
 import threading
 import time
 import clientsubnetoption
-from recursortests import RecursorTest
+import unittest
+from recursortests import RecursorTest, have_ipv6
 from twisted.internet.protocol import DatagramProtocol
 from twisted.internet import reactor
 
@@ -73,7 +74,7 @@ disable-syslog=yes
             reactor.listenUDP(port, UDPECSResponder(), interface=address)
             ecsReactorRunning = True
 
-        if not ecsReactorv6Running:
+        if not ecsReactorv6Running and have_ipv6():
             reactor.listenUDP(53000, UDPECSResponder(), interface='::1')
             ecsReactorv6Running = True
 
@@ -347,6 +348,7 @@ ecs-ipv6-cache-bits=128
         query = dns.message.make_query(nameECS, 'TXT', 'IN', use_edns=True, options=[ecso], payload=512)
         self.sendECSQuery(query, expected, ttlECS)
 
+@unittest.skipIf(not have_ipv6(), "No IPv6")
 class testIncomingECSByNameV6(ECSTest):
     _confdir = 'ECSIncomingByNameV6'
 
-- 
2.47.2