-first try on blocks

1 files changed, 128 insertions, 0 deletions

diff --git a/src/gns/plugin_block_gns.c b/src/gns/plugin_block_gns.c
new file mode 100644
index 000000000..33699a32c
--- /dev/null
+++ b/src/gns/plugin_block_gns.c
@@ -0,0 +1,128 @@
+/*
+     This file is part of GNUnet
+     (C) 2010 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file gns/plugin_block_gns.c
+ * @brief blocks used for GNS records
+ * @author Martin Schanzenbach
+ */
+
+#include "platform.h"
+#include "gnunet_block_plugin.h"
+#include "block_gns.h"
+#include "gnunet_signatures.h"
+
+/**
+ * Number of bits we set per entry in the bloomfilter.
+ * Do not change! -from fs
+ */
+#define BLOOMFILTER_K 16
+
+/**
+ * Function called to validate a reply or a request.  For
+ * request evaluation, simply pass "NULL" for the reply_block.
+ * Note that it is assumed that the reply has already been
+ * matched to the key (and signatures checked) as it would
+ * be done with the "get_key" function.
+ *
+ * @param cls closure
+ * @param type block type
+ * @param query original query (hash)
+ * @param bf pointer to bloom filter associated with query; possibly updated (!)
+ * @param bf_mutator mutation value for bf
+ * @param xquery extrended query data (can be NULL, depending on type)
+ * @param xquery_size number of bytes in xquery
+ * @param reply_block response to validate
+ * @param reply_block_size number of bytes in reply block
+ * @return characterization of result
+ */
+static enum GNUNET_BLOCK_EvaluationResult
+block_plugin_gns_evaluate (void *cls, enum GNUNET_BLOCK_Type type,
+                          const GNUNET_HashCode * query,
+                          struct GNUNET_CONTAINER_BloomFilter **bf,
+                          int32_t bf_mutator, const void *xquery,
+                          size_t xquery_size, const void *reply_block,
+                          size_t reply_block_size)
+{
+  if (type != GNUNET_BLOCK_TYPE_GNS_RECORD)
+    return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
+  
+  //FIXME check signatures here
+  return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
+}
+
+
+/**
+ * Function called to obtain the key for a block.
+ *
+ * @param cls closure
+ * @param type block type
+ * @param block block to get the key for
+ * @param block_size number of bytes in block
+ * @param key set to the key (query) for the given block
+ * @return GNUNET_OK on success, GNUNET_SYSERR if type not supported
+ *         (or if extracting a key from a block of this type does not work)
+ */
+static int
+block_plugin_gns_get_key (void *cls, enum GNUNET_BLOCK_Type type,
+                         const void *block, size_t block_size,
+                         GNUNET_HashCode * key)
+{
+  if (type != GNUNET_BLOCK_TYPE_GNS_RECORD)
+    return GNUNET_NO;
+  //FIXME calculate key from name and hash(pkey) here
+  return GNUNET_OK;
+}
+
+
+/**
+ * Entry point for the plugin.
+ */
+void *
+libgnunet_plugin_block_gns_init (void *cls)
+{
+  static enum GNUNET_BLOCK_Type types[] =
+  {
+    GNUNET_BLOCK_TYPE_GNS_RECORD,
+    GNUNET_BLOCK_TYPE_ANY       /* end of list */
+  };
+  struct GNUNET_BLOCK_PluginFunctions *api;
+
+  api = GNUNET_malloc (sizeof (struct GNUNET_BLOCK_PluginFunctions));
+  api->evaluate = &block_plugin_gns_evaluate;
+  api->get_key = &block_plugin_gns_get_key;
+  api->types = types;
+  return api;
+}
+
+
+/**
+ * Exit point from the plugin.
+ */
+void *
+libgnunet_plugin_block_gns_done (void *cls)
+{
+  struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
+
+  GNUNET_free (api);
+  return NULL;
+}
+
+/* end of plugin_block_gns.c */