Fix free host segfault

CHANGELOG.md

@@ -16,6 +16,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   [#538](https://github.com/greenbone/gvm-libs/pull/538)
 - Add function for mqtt init status [#567](https://github.com/greenbone/gvm-libs/pull/567)
 - Add function to get the severity_vector, otherwise the cvss_base_vector. [#568](https://github.com/greenbone/gvm-libs/pull/568)
+- Add function to duplicate host and vhost objects [#590](https://github.com/greenbone/gvm-libs/pull/590)
 
 ### Changed
 

base/hosts.c

@@ -908,6 +908,28 @@ gvm_vhost_free (gpointer vhost)
   g_free (vhost);
 }
 
+/**
+ * @brief Creates a deep copy of a gvm_vhost_t object.
+ *
+ * @param vhost source vhost
+ * @param data dummy for g_slist_copy_deep
+ * @return gpointer copy of vhost
+ */
+gpointer
+gvm_duplicate_vhost (gconstpointer vhost, gpointer data)
+{
+  (void) (data);
+  gvm_vhost_t *ret = NULL;
+
+  if (!vhost)
+    return NULL;
+
+  ret = gvm_vhost_new (g_strdup (((gvm_vhost_t *) vhost)->value),
+                       g_strdup (((gvm_vhost_t *) vhost)->source));
+
+  return ret;
+}
+
 /**
  * @brief Creates a new gvm_host_t object.
  *
@@ -1986,6 +2008,43 @@ gvm_host_find_in_hosts (const gvm_host_t *host, const struct in6_addr *addr,
   return NULL;
 }
 
+/**
+ * @brief Creates a deep copy of a host. gvm_host_free has to be called on it.
+ *
+ * @param host source host
+ * @return gvm_host_t* copy of host
+ */
+gvm_host_t *
+gvm_duplicate_host (gvm_host_t *host)
+{
+  gvm_host_t *ret = NULL;
+
+  if (host == NULL)
+    return NULL;
+
+  ret = gvm_host_new ();
+
+  ret->type = host->type;
+  switch (host->type)
+    {
+    case HOST_TYPE_NAME:
+      ret->name = g_strdup (host->name);
+      break;
+    case HOST_TYPE_IPV4:
+      ret->addr.s_addr = host->addr.s_addr;
+      break;
+    case HOST_TYPE_IPV6:
+      ret->addr6.__in6_u = host->addr6.__in6_u;
+      break;
+    default:
+      g_free (ret);
+      return NULL;
+    }
+  ret->vhosts = g_slist_copy_deep (host->vhosts, gvm_duplicate_vhost, NULL);
+
+  return ret;
+}
+
 /**
  * @brief Returns whether a host has an equal host in a hosts collection.
  * eg. 192.168.10.1 has an equal in list created from

base/hosts.h

@@ -189,6 +189,11 @@ gvm_host_add_reverse_lookup (gvm_host_t *);
 
 void gvm_host_free (gpointer);
 
+gpointer gvm_duplicate_vhost (gconstpointer, gpointer);
+
+gvm_host_t *
+gvm_duplicate_host (gvm_host_t *);
+
 /* Miscellaneous functions */
 
 gvm_vhost_t *