/*
This file is part of GNUnet
- Copyright (C) 2010 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2010, 2017 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
* DHT (see fs block plugin)
* @author Christian Grothoff
*/
-
#include "platform.h"
#include "gnunet_constants.h"
#include "gnunet_hello_lib.h"
#include "gnunet_block_plugin.h"
+#include "gnunet_block_group_lib.h"
#define DEBUG_DHT GNUNET_EXTRA_LOGGING
+/**
+ * Number of bits we set per entry in the bloomfilter.
+ * Do not change!
+ */
+#define BLOOMFILTER_K 16
+
+
+/**
+ * How many bytes should a bloomfilter be if we have already seen
+ * entry_count responses? Note that #GNUNET_CONSTANTS_BLOOMFILTER_K
+ * gives us the number of bits set per entry. Furthermore, we should
+ * not re-size the filter too often (to keep it cheap).
+ *
+ * Since other peers will also add entries but not resize the filter,
+ * we should generally pick a slightly larger size than what the
+ * strict math would suggest.
+ *
+ * @param entry_count expected number of entries in the Bloom filter
+ * @return must be a power of two and smaller or equal to 2^15.
+ */
+static size_t
+compute_bloomfilter_size (unsigned int entry_count)
+{
+ size_t size;
+ unsigned int ideal = (entry_count * BLOOMFILTER_K) / 4;
+ uint16_t max = 1 << 15;
+
+ if (entry_count > max)
+ return max;
+ size = 8;
+ while ((size < max) && (size < ideal))
+ size *= 2;
+ if (size > max)
+ return max;
+ return size;
+}
+
+
+/**
+ * Create a new block group.
+ *
+ * @param ctx block context in which the block group is created
+ * @param type type of the block for which we are creating the group
+ * @param nonce random value used to seed the group creation
+ * @param raw_data optional serialized prior state of the group, NULL if unavailable/fresh
+ * @param raw_data_size number of bytes in @a raw_data, 0 if unavailable/fresh
+ * @param va variable arguments specific to @a type
+ * @return block group handle, NULL if block groups are not supported
+ * by this @a type of block (this is not an error)
+ */
+static struct GNUNET_BLOCK_Group *
+block_plugin_dht_create_group (void *cls,
+ enum GNUNET_BLOCK_Type type,
+ uint32_t nonce,
+ const void *raw_data,
+ size_t raw_data_size,
+ va_list va)
+{
+ unsigned int bf_size;
+ const char *guard;
+
+ guard = va_arg (va, const char *);
+ if (0 == memcmp (guard,
+ "seen-set-size",
+ strlen ("seen-set-size")))
+ bf_size = compute_bloomfilter_size (va_arg (va, unsigned int));
+ else if (0 == memcmp (guard,
+ "filter-size",
+ strlen ("filter-size")))
+ bf_size = va_arg (va, unsigned int);
+ else
+ {
+ GNUNET_break (0);
+ bf_size = 8;
+ }
+ GNUNET_break (NULL == va_arg (va, const char *));
+ return GNUNET_BLOCK_GROUP_bf_create (cls,
+ bf_size,
+ BLOOMFILTER_K,
+ type,
+ nonce,
+ raw_data,
+ raw_data_size);
+}
+
/**
* Function called to validate a reply or a request. For
*
* @param cls closure
* @param type block type
+ * @param group block group to check against
* @param eo control flags
* @param query original query (hash)
- * @param bf pointer to bloom filter associated with query; possibly updated (!)
- * @param bf_mutator mutation value for @a bf
* @param xquery extended query data (can be NULL, depending on type)
* @param xquery_size number of bytes in @a xquery
* @param reply_block response to validate
static enum GNUNET_BLOCK_EvaluationResult
block_plugin_dht_evaluate (void *cls,
enum GNUNET_BLOCK_Type type,
+ struct GNUNET_BLOCK_Group *group,
enum GNUNET_BLOCK_EvaluationOptions eo,
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 mhash;
const struct GNUNET_HELLO_Message *hello;
struct GNUNET_PeerIdentity pid;
const struct GNUNET_MessageHeader *msg;
if (type != GNUNET_BLOCK_TYPE_DHT_HELLO)
return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
- if (xquery_size != 0)
+ if (0 != xquery_size)
{
GNUNET_break_op (0);
return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
GNUNET_break_op (0);
return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
}
- if (NULL != bf)
- {
- GNUNET_CRYPTO_hash (&pid, sizeof (pid), &phash);
- GNUNET_BLOCK_mingle_hash (&phash, 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,
- GNUNET_CONSTANTS_BLOOMFILTER_K);
- }
- GNUNET_CONTAINER_bloomfilter_add (*bf, &mhash);
- }
+ GNUNET_CRYPTO_hash (&pid,
+ sizeof (pid),
+ &phash);
+ if (GNUNET_YES ==
+ GNUNET_BLOCK_GROUP_bf_test_and_set (group,
+ &phash))
+ return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
return GNUNET_BLOCK_EVALUATION_OK_MORE;
}
* @param type block type
* @param block block to get the key for
* @param block_size number of bytes @a block
- * @param key set to the key (query) for the given block
+ * @param[out] 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_dht_get_key (void *cls, enum GNUNET_BLOCK_Type type,
- const void *block, size_t block_size,
- struct GNUNET_HashCode * key)
+block_plugin_dht_get_key (void *cls,
+ enum GNUNET_BLOCK_Type type,
+ const void *block,
+ size_t block_size,
+ struct GNUNET_HashCode *key)
{
const struct GNUNET_MessageHeader *msg;
const struct GNUNET_HELLO_Message *hello;
api = GNUNET_new (struct GNUNET_BLOCK_PluginFunctions);
api->evaluate = &block_plugin_dht_evaluate;
api->get_key = &block_plugin_dht_get_key;
+ api->create_group = &block_plugin_dht_create_group;
api->types = types;
return api;
}
projects / oweals / gnunet.git / blobdiff