fix(macros): hostgroups/servicegroups may be empty.

REFS: MON-7197

CHANGELOG.md

@@ -1,5 +1,14 @@
 # Changelog
 
+## 21.04.1
+
+### Bugs
+
+*Macros*
+
+If a service / host is not in a service/host group, then the HOSTGROUPNAME/
+SERVICEGROUPNAME macros can lead to segfault. This patch fixes this issue.
+
 ## 21.04.0
 
 `To be released in april 2021`

CMakeLists.txt

@@ -68,7 +68,7 @@ link_directories(${json11_LIB_DIRS})
 # Version.
 set(CENTREON_ENGINE_MAJOR 21)
 set(CENTREON_ENGINE_MINOR 04)
-set(CENTREON_ENGINE_PATCH 0)
+set(CENTREON_ENGINE_PATCH 1)
 if (CENTREON_ENGINE_PRERELEASE)
   set(CENTREON_ENGINE_VERSION "${CENTREON_ENGINE_MAJOR}.${CENTREON_ENGINE_MINOR}.${CENTREON_ENGINE_PATCH}-${CENTREON_ENGINE_PRERELEASE}")
 else ()

src/macros/grab_host.cc

@@ -33,12 +33,6 @@ using namespace com::centreon::engine;
 using namespace com::centreon::engine::macros;
 using namespace com::centreon::engine::logging;
 
-/**************************************
- *                                     *
- *           Local Functions           *
- *                                     *
- **************************************/
-
 /**
  *  Generate total services macros.
  *
@@ -141,10 +135,13 @@ static std::string get_host_group_names(host& hst, nagios_macros* mac) {
  */
 static std::string get_host_group_name(host& hst, nagios_macros* mac) {
   (void)mac;
-  logger(dbg_notifications, more) << "on macro juste avant host group ";
-  std::string buf{hst.get_parent_groups().front()->get_group_name()};
-  logger(dbg_notifications, more) << "on macro after host group " << buf;
-  return buf;
+
+  // Find all hostgroups this host is associated with.
+  auto it = hst.get_parent_groups().begin();
+  if (it == hst.get_parent_groups().end())
+    return "";
+  else
+    return (*it)->get_group_name();
 }
 
 /**

src/macros/grab_service.cc

@@ -93,9 +93,11 @@ static std::string get_service_group_name(service& svc, nagios_macros* mac) {
   (void)mac;
 
   // Find all servicegroups this service is associated with.
-  std::string buf{svc.get_parent_groups().front()->get_group_name()};
-  logger(dbg_notifications, more) << "on grab service service name :" << buf;
-  return buf;
+  auto it = svc.get_parent_groups().begin();
+  if (it == svc.get_parent_groups().end())
+    return "";
+  else
+    return (*it)->get_group_name();
 }
 
 /**
@@ -234,7 +236,11 @@ struct grab_service_redirection {
         true}},
       // Is volatile.
       {MACRO_SERVICEISVOLATILE,
-       {&get_member_as_string<service, bool, notifier, &notifier::get_is_volatile>, true}},
+       {&get_member_as_string<service,
+                              bool,
+                              notifier,
+                              &notifier::get_is_volatile>,
+        true}},
       // Attempt.
       {MACRO_SERVICEATTEMPT,
        {&get_member_as_string<service,