Block UDP 53 in test_bootstrap_tor using subprocess call of iptables

src/tests/core.py

@@ -18,6 +18,7 @@ import unittest
 
 import protocol
 import state
+import subprocess
 import helper_sent
 import helper_addressbook
 
@@ -263,9 +264,22 @@ class TestCore(unittest.TestCase):
     def test_bootstrap_tor(self):
         """test bootstrapping with tor"""
         BMConfigParser().set('bitmessagesettings', 'socksproxytype', 'SOCKS5')
+        iptables_rule = [
+            'OUTPUT', '-p', 'udp', '--dport', '53', '-j', 'REJECT']
+        try:
+            subprocess.call(['sudo', 'iptables', '-A'] + iptables_rule)
+        except OSError:
+            print('Failed to use iptables ):')
+        else:
+            with self.assertRaises(socket.gaierror):
+                socket.getaddrinfo('bootstrap8080.bitmessage.org', 8444)
         self._initiate_bootstrap()
         self._check_connection()
         self._check_knownnodes()
+        try:
+            subprocess.call(['sudo', 'iptables', '-D'] + iptables_rule)
+        except OSError:
+            pass
 
     @unittest.skipIf(tor_port_free, 'no running tor detected')
     def test_onionservicesonly(self):