salt/fix-for-errno-0-resolver-error-0-no-error-bsc-108758.patch

From b9cc71639d4e918ef14635124f6991917150de46 Mon Sep 17 00:00:00 2001
From: Bo Maryniuk <bo@suse.de>
Date: Wed, 21 Mar 2018 11:10:23 +0100
Subject: [PATCH] Fix for [Errno 0] Resolver Error 0 (no error)
 (bsc#1087581)

  * Lintfix: PEP8 ident
  * Use proper levels of the error handling, use proper log formatting.
  * Fix unit test for reversed fqdns return data
---
 salt/grains/core.py            | 19 ++++++++++++-------
 tests/unit/grains/test_core.py | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 7 deletions(-)

diff --git a/salt/grains/core.py b/salt/grains/core.py
index 17a7d9819a..cd9ba1f29c 100644
--- a/salt/grains/core.py
+++ b/salt/grains/core.py
@@ -1900,16 +1900,21 @@ def fqdns():
     fqdns = set()
 
     addresses = salt.utils.network.ip_addrs(include_loopback=False,
-        interface_data=_INTERFACES)
+                                            interface_data=_INTERFACES)
     addresses.extend(salt.utils.network.ip_addrs6(include_loopback=False,
-        interface_data=_INTERFACES))
-
+                                                  interface_data=_INTERFACES))
+    err_message = 'Exception during resolving address: %s'
     for ip in addresses:
         try:
-            fqdns.add(socket.gethostbyaddr(ip)[0])
-        except (socket.error, socket.herror,
-            socket.gaierror, socket.timeout) as e:
-            log.info("Exception during resolving address: " + str(e))
+            fqdns.add(socket.getfqdn(socket.gethostbyaddr(ip)[0]))
+        except socket.herror as err:
+            if err.errno == 0:
+                # No FQDN for this IP address, so we don't need to know this all the time.
+                log.debug("Unable to resolve address %s: %s", ip, err)
+            else:
+                log.error(err_message, err)
+        except (socket.error, socket.gaierror, socket.timeout) as err:
+            log.error(err_message, err)
 
     grains['fqdns'] = list(fqdns)
     return grains
diff --git a/tests/unit/grains/test_core.py b/tests/unit/grains/test_core.py
index 47c9cdd35b..c604df6c57 100644
--- a/tests/unit/grains/test_core.py
+++ b/tests/unit/grains/test_core.py
@@ -784,3 +784,35 @@ SwapTotal:       4789244 kB'''
                        []}}
         with patch.object(salt.utils.dns, 'parse_resolv', MagicMock(return_value=resolv_mock)):
             assert core.dns() == ret
+
+    def _run_dns_test(self, resolv_mock, ret):
+        with patch.object(salt.utils, 'is_windows',
+                          MagicMock(return_value=False)):
+            with patch.dict(core.__opts__, {'ipv6': False}):
+                with patch.object(salt.utils.dns, 'parse_resolv',
+                                  MagicMock(return_value=resolv_mock)):
+                    get_dns = core.dns()
+                    self.assertEqual(get_dns, ret)
+
+    @skipIf(not salt.utils.platform.is_linux(), 'System is not Linux')
+    @patch.object(salt.utils, 'is_windows', MagicMock(return_value=False))
+    @patch('salt.utils.network.ip_addrs', MagicMock(return_value=['1.2.3.4', '5.6.7.8']))
+    @patch('salt.utils.network.ip_addrs6',
+           MagicMock(return_value=['fe80::a8b2:93ff:fe00:0', 'fe80::a8b2:93ff:dead:beef']))
+    @patch('salt.utils.network.socket.getfqdn', MagicMock(side_effect=lambda v: v))  # Just pass-through
+    def test_fqdns_return(self):
+        '''
+        test the return for a dns grain. test for issue:
+        https://github.com/saltstack/salt/issues/41230
+        '''
+        reverse_resolv_mock = [('foo.bar.baz', [], ['1.2.3.4']),
+                               ('rinzler.evil-corp.com', [], ['5.6.7.8']),
+                               ('foo.bar.baz', [], ['fe80::a8b2:93ff:fe00:0']),
+                               ('bluesniff.foo.bar', [], ['fe80::a8b2:93ff:dead:beef'])]
+        ret = {'fqdns': ['bluesniff.foo.bar', 'foo.bar.baz', 'rinzler.evil-corp.com']}
+        with patch.object(socket, 'gethostbyaddr', side_effect=reverse_resolv_mock):
+            fqdns = core.fqdns()
+            self.assertIn('fqdns', fqdns)
+            self.assertEqual(len(fqdns['fqdns']), len(ret['fqdns']))
+            self.assertEqual(set(fqdns['fqdns']), set(ret['fqdns']))
+
-- 
2.13.6