Move regex DHT integration from mesh to regex

1 files changed, 221 insertions, 0 deletions

diff --git a/src/regex/plugin_block_regex.c b/src/regex/plugin_block_regex.c
new file mode 100644
index 000000000..9a5ab33ec
--- /dev/null
+++ b/src/regex/plugin_block_regex.c
@@ -0,0 +1,221 @@
+/*
+     This file is part of GNUnet
+     (C) 2013 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 regex/plugin_block_regex.c
+ * @brief blocks used for regex storage and search
+ * @author Bartlomiej Polot
+ */
+
+#include "platform.h"
+#include "gnunet_block_plugin.h"
+#include "block_regex.h"
+#include "regex_block_lib.h"
+
+/**
+ * Number of bits we set per entry in the bloomfilter.
+ * Do not change!
+ */
+#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_regex_evaluate (void *cls, enum GNUNET_BLOCK_Type type,
+                             const struct 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)
+{
+  struct GNUNET_HashCode chash;
+  struct GNUNET_HashCode mhash;
+
+  switch (type)
+  {
+    case GNUNET_BLOCK_TYPE_REGEX:
+      if (NULL == reply_block)
+        return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
+      if (0 != xquery_size)
+      {
+        const char *query;
+
+        query = (const char *) xquery;
+        if ('\0' != query[xquery_size - 1]) /* must be valid string */
+        {
+          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                      "Block xquery not a valid string\n");
+          return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
+        }
+      }
+      else
+      {
+        GNUNET_break_op (0);
+        return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
+      }
+      switch (GNUNET_REGEX_block_check (reply_block,
+                                        reply_block_size,
+                                        xquery))
+      {
+        case GNUNET_SYSERR:
+          GNUNET_break_op(0);
+          return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
+        case GNUNET_NO:
+          GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                      "BLOCK XQUERY %s not accepted\n", xquery);
+          return GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT;
+        default:
+          GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                      "BLOCK XQUERY %s accepted\n", xquery);
+          break;
+      }
+      if (NULL != bf)
+      {
+        GNUNET_CRYPTO_hash (reply_block, reply_block_size, &chash);
+        GNUNET_BLOCK_mingle_hash (&chash, bf_mutator, &mhash);
+        if (NULL != *bf)
+        {
+          if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (*bf, &mhash))
+            return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
+        }
+        else
+        {
+          *bf = GNUNET_CONTAINER_bloomfilter_init (NULL, 8, BLOOMFILTER_K);
+        }
+        GNUNET_CONTAINER_bloomfilter_add (*bf, &mhash);
+      }
+      return GNUNET_BLOCK_EVALUATION_OK_MORE;
+
+
+    case GNUNET_BLOCK_TYPE_REGEX_ACCEPT:
+      if (0 != xquery_size)
+      {
+        GNUNET_break_op (0);
+        return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
+      }
+      if (NULL == reply_block)
+        return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
+      if (sizeof (struct RegexAccept) != reply_block_size)
+      {
+        GNUNET_break_op(0);
+        return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
+      }
+      if (NULL != bf)
+      {
+        GNUNET_CRYPTO_hash (reply_block, reply_block_size, &chash);
+        GNUNET_BLOCK_mingle_hash (&chash, bf_mutator, &mhash);
+        if (NULL != *bf)
+        {
+          if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (*bf, &mhash))
+            return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
+        }
+        else
+        {
+          *bf = GNUNET_CONTAINER_bloomfilter_init (NULL, 8, BLOOMFILTER_K);
+        }
+        GNUNET_CONTAINER_bloomfilter_add (*bf, &mhash);
+      }
+      return GNUNET_BLOCK_EVALUATION_OK_MORE;
+
+
+    default:
+      return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
+  }
+}
+
+
+/**
+ * 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_regex_get_key (void *cls, enum GNUNET_BLOCK_Type type,
+                            const void *block, size_t block_size,
+                            struct GNUNET_HashCode * key)
+{
+  switch (type)
+  {
+  default:
+    /* FIXME */
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
+  }
+}
+
+
+/**
+ * Entry point for the plugin.
+ */
+void *
+libgnunet_plugin_block_regex_init (void *cls)
+{
+  static enum GNUNET_BLOCK_Type types[] =
+  {
+    GNUNET_BLOCK_TYPE_REGEX,
+    GNUNET_BLOCK_TYPE_REGEX_ACCEPT,
+    GNUNET_BLOCK_TYPE_ANY       /* end of list */
+  };
+  struct GNUNET_BLOCK_PluginFunctions *api;
+
+  api = GNUNET_malloc (sizeof (struct GNUNET_BLOCK_PluginFunctions));
+  api->evaluate = &block_plugin_regex_evaluate;
+  api->get_key = &block_plugin_regex_get_key;
+  api->types = types;
+  return api;
+}
+
+
+/**
+ * Exit point from the plugin.
+ */
+void *
+libgnunet_plugin_block_regex_done (void *cls)
+{
+  struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
+
+  GNUNET_free (api);
+  return NULL;
+}
+
+/* end of plugin_block_regex.c */