From 52ebe09fea340e207cf4e34a04f836a9cba82593 Mon Sep 17 00:00:00 2001
From: Shim Shtein <sshtein@redhat.com>
Date: Wed, 27 Nov 2024 06:53:31 -0500
Subject: [PATCH] Fixes #38046 - Make sure IPv6 interface can be primary

---
 app/services/fact_parser.rb   | 29 +++++++++++++++--------------
 test/unit/fact_parser_test.rb | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 14 deletions(-)

diff --git a/app/services/fact_parser.rb b/app/services/fact_parser.rb
index 1deeeada866..54e070b632b 100644
--- a/app/services/fact_parser.rb
+++ b/app/services/fact_parser.rb
@@ -78,7 +78,7 @@ def interfaces
   # tries to detect primary interface among interfaces using host name
   def suggested_primary_interface(host)
     # we search among interface with ip and mac if we didn't find it by name
-    potential = interfaces.select { |_, values| values[:ipaddress].present? && values[:macaddress].present? }
+    potential = interfaces.select { |_, values| (values[:ipaddress].present? || values[:ipaddress6].present?) && values[:macaddress].present? }
     find_interface_by_name(host.name) || find_physical_interface(potential) ||
       find_virtual_interface(potential) || potential.first || interfaces.first
   end
@@ -139,20 +139,21 @@ def bios
   def find_interface_by_name(host_name)
     resolver = Resolv::DNS.new
     resolver.timeouts = PRIMARY_INTERFACE_RESOLVE_TIMEOUTS
-    interfaces.detect do |int, values|
-      if (ip = values[:ipaddress]).present?
-        begin
-          logger.debug { "Resolving fact '#{ip}' via DNS to match reported hostname #{host_name}" }
-          if resolver.getnames(ip).any? { |name| name.to_s == host_name }
-            logger.debug { "Match: '#{ip}', interface #{int} is selected as primary" }
-            return [int, values]
-          end
-        rescue Resolv::ResolvError => e
-          logger.debug { "Could not resolv name for #{ip} because of #{e} #{e.message}" }
-          nil
-        end
-      end
+    interfaces.find do |int, values|
+      [values[:ipaddress], values[:ipaddress6]].find { |ip| try_resolve(int, ip, host_name, resolver) }
+    end
+  end
+
+  def try_resolve(int, ip, host_name, resolver)
+    return nil unless ip
+    logger.debug { "Resolving fact '#{ip}' via DNS to match reported hostname #{host_name}" }
+    if resolver.getnames(ip).any? { |name| name.to_s == host_name }
+      logger.debug { "Match: '#{ip}', interface #{int} is selected as primary" }
+      true
     end
+  rescue Resolv::ResolvError => e
+    logger.debug { "Could not resolv name for #{ip} because of #{e} #{e.message}" }
+    nil
   end
 
   def find_physical_interface(interfaces)
diff --git a/test/unit/fact_parser_test.rb b/test/unit/fact_parser_test.rb
index a57246e7680..1804606eab1 100644
--- a/test/unit/fact_parser_test.rb
+++ b/test/unit/fact_parser_test.rb
@@ -297,6 +297,22 @@ class FactParserTest < ActiveSupport::TestCase
       assert_equal '00:00:00:00:00:12', found.last[:macaddress]
     end
 
+    test "#suggested_primary_interface detects primary interface using DNS IPv6" do
+      parser.stubs(:interfaces).returns({
+        'br0' => {'ipaddress6' => 'fe80::10', 'macaddress' => '00:00:00:00:00:10'},
+        'em1' => {'ipaddress6' => 'fe80::20', 'macaddress' => '00:00:00:00:00:20'},
+        'em2' => {'ipaddress6' => 'fe80::30', 'macaddress' => '00:00:00:00:00:30'},
+        'bond0' => {'ipaddress6' => 'fe80::40', 'macaddress' => '00:00:00:00:00:40'},
+      }.with_indifferent_access)
+
+      Resolv::DNS.any_instance.stubs(:getnames).returns([])
+      Resolv::DNS.any_instance.expects(:getnames).with('fe80::30').returns([host.name])
+      found = parser.suggested_primary_interface(host)
+      assert_equal 'em2', found.first
+      assert_equal 'fe80::30', found.last[:ipaddress6]
+      assert_equal '00:00:00:00:00:30', found.last[:macaddress]
+    end
+
     test "#suggested_primary_interface primary interface detection falls back to physical with ip and mac" do
       parser.stubs(:interfaces).returns({
         'br0' => {'ipaddress' => '30.0.0.30', 'macaddress' => '00:00:00:00:00:30'},
@@ -313,6 +329,22 @@ class FactParserTest < ActiveSupport::TestCase
       assert_equal '00:00:00:00:00:10', found.last[:macaddress]
     end
 
+    test "#suggested_primary_interface primary interface detection falls back to physical with ip and mac" do
+      parser.stubs(:interfaces).returns({
+        'br0' => {'ipaddress6' => 'fe80::10', 'macaddress' => '00:00:00:00:00:30'},
+        'em0' => {'ipaddress6' => '', 'macaddress' => ''},
+        'em1' => {'ipaddress6' => 'fe80::20', 'macaddress' => '00:00:00:00:00:10'},
+        'em2' => {'ipaddress6' => 'fe80::30', 'macaddress' => '00:00:00:00:00:12'},
+        'bond0' => {'ipaddress6' => 'fe80::40', 'macaddress' => '00:00:00:00:00:15'},
+      }.with_indifferent_access)
+
+      Resolv::DNS.any_instance.stubs(:getnames).returns([])
+      found = parser.suggested_primary_interface(host)
+      assert_equal 'em1', found.first
+      assert_equal 'fe80::20', found.last[:ipaddress6]
+      assert_equal '00:00:00:00:00:10', found.last[:macaddress]
+    end
+
     test "#suggested_primary_interface primary interface detection falls back to first with ip and mac if no physical" do
       parser.stubs(:interfaces).returns({
         'bond1' => {'ipaddress' => '', 'macaddress' => ''},