From f4523a21e913449db2dbf79de3568b396b179ca1 Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@collectd.org>
Date: Wed, 23 Nov 2011 14:28:27 +0100
Subject: [PATCH] src/plugin.[ch]: Add plugin_dispatch_values_secure().

Change-Id: I1f7403b2e82edd099f0168d0a0735cd18f8ce05a
---
 src/plugin.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 src/plugin.h |  3 ++-
 2 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/src/plugin.c b/src/plugin.c
index 6d7c96e4..3c92df21 100644
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -1523,6 +1523,52 @@ int plugin_dispatch_values (value_list_t *vl)
 	return (0);
 } /* int plugin_dispatch_values */
 
+int plugin_dispatch_values_secure (const value_list_t *vl)
+{
+  value_list_t vl_copy;
+  int status;
+
+  if (vl == NULL)
+    return EINVAL;
+
+  memcpy (&vl_copy, vl, sizeof (vl_copy));
+
+  /* Write callbacks must not change the values and meta pointers, so we can
+   * savely skip copying those and make this more efficient. */
+  if ((pre_cache_chain == NULL) && (post_cache_chain == NULL))
+    return (plugin_dispatch_values (&vl_copy));
+
+  /* Set pointers to NULL, just to be on the save side. */
+  vl_copy.values = NULL;
+  vl_copy.meta = NULL;
+
+  vl_copy.values = malloc (sizeof (*vl_copy.values) * vl->values_len);
+  if (vl_copy.values == NULL)
+  {
+    ERROR ("plugin_dispatch_values_secure: malloc failed.");
+    return (ENOMEM);
+  }
+  memcpy (vl_copy.values, vl->values, sizeof (*vl_copy.values) * vl->values_len);
+
+  if (vl->meta != NULL)
+  {
+    vl_copy.meta = meta_data_clone (vl->meta);
+    if (vl_copy.meta == NULL)
+    {
+      ERROR ("plugin_dispatch_values_secure: meta_data_clone failed.");
+      free (vl_copy.values);
+      return (ENOMEM);
+    }
+  } /* if (vl->meta) */
+
+  status = plugin_dispatch_values (&vl_copy);
+
+  meta_data_destroy (vl_copy.meta);
+  free (vl_copy.values);
+
+  return (status);
+} /* int plugin_dispatch_values_secure */
+
 int plugin_dispatch_notification (const notification_t *notif)
 {
 	llentry_t *le;
diff --git a/src/plugin.h b/src/plugin.h
index 3f94dbc8..0b34ab1d 100644
--- a/src/plugin.h
+++ b/src/plugin.h
@@ -2,7 +2,7 @@
 #define PLUGIN_H
 /**
  * collectd - src/plugin.h
- * Copyright (C) 2005-2008  Florian octo Forster
+ * Copyright (C) 2005-2011  Florian octo Forster
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -308,6 +308,7 @@ int plugin_unregister_notification (const char *name);
  *              function.
  */
 int plugin_dispatch_values (value_list_t *vl);
+int plugin_dispatch_values_secure (const value_list_t *vl);
 
 int plugin_dispatch_notification (const notification_t *notif);
 
-- 
2.30.2