*/
#include "platform.h"
#include "gnunet_util_lib.h"
+#include "gnunet_constants.h"
#include "gnunet_signatures.h"
#include "gnunet_block_lib.h"
#include "gnunet_block_plugin.h"
{
/**
* Name of the shared library.
- */
+ */
char *library_name;
-
+
/**
* Plugin API.
*/
struct GNUNET_BLOCK_Context
{
/**
- * NULL-terminated array of our plugins.
+ * Array of our plugins.
*/
struct Plugin **plugins;
+ /**
+ * Size of the 'plugins' array.
+ */
+ unsigned int num_plugins;
+
/**
* Our configuration.
- */
+ */
const struct GNUNET_CONFIGURATION_Handle *cfg;
};
/**
* Mingle hash with the mingle_number to produce different bits.
- *
+ *
* @param in original hash code
* @param mingle_number number for hash permutation
* @param hc where to store the result.
*/
void
-GNUNET_BLOCK_mingle_hash (const GNUNET_HashCode * in,
- uint32_t mingle_number,
- GNUNET_HashCode * hc)
+GNUNET_BLOCK_mingle_hash (const GNUNET_HashCode * in, uint32_t mingle_number,
+ GNUNET_HashCode * hc)
{
GNUNET_HashCode m;
- GNUNET_CRYPTO_hash (&mingle_number,
- sizeof (uint32_t),
- &m);
+ GNUNET_CRYPTO_hash (&mingle_number, sizeof (uint32_t), &m);
GNUNET_CRYPTO_hash_xor (&m, in, hc);
}
+/**
+ * Add a plugin to the list managed by the block library.
+ *
+ * @param cls the block context
+ * @param library_name name of the plugin
+ * @param lib_ret the plugin API
+ */
+static void
+add_plugin (void *cls, const char *library_name, void *lib_ret)
+{
+ struct GNUNET_BLOCK_Context *ctx = cls;
+ struct GNUNET_BLOCK_PluginFunctions *api = lib_ret;
+ struct Plugin *plugin;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, _("Loading block plugin `%s'\n"),
+ library_name);
+ plugin = GNUNET_malloc (sizeof (struct Plugin));
+ plugin->api = api;
+ plugin->library_name = GNUNET_strdup (library_name);
+ GNUNET_array_append (ctx->plugins, ctx->num_plugins, plugin);
+}
+
+
+
/**
* Create a block context. Loads the block plugins.
*
GNUNET_BLOCK_context_create (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct GNUNET_BLOCK_Context *ctx;
- struct GNUNET_BLOCK_PluginFunctions *api;
- struct Plugin *plugin;
- unsigned int num_plugins;
- char *plugs;
- char *pos;
- char *libname;
ctx = GNUNET_malloc (sizeof (struct GNUNET_BLOCK_Context));
ctx->cfg = cfg;
- num_plugins = 0;
- if (GNUNET_OK ==
- GNUNET_CONFIGURATION_get_value_string (cfg,
- "block", "PLUGINS", &plugs))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("Loading block plugins `%s'\n"), plugs);
- pos = strtok (plugs, " ");
- while (pos != NULL)
- {
- GNUNET_asprintf (&libname, "libgnunet_plugin_block_%s", pos);
- api = GNUNET_PLUGIN_load (libname, NULL);
- if (api == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Failed to load block plugin `%s'\n"),
- pos);
- GNUNET_free (libname);
- }
- else
- {
- plugin = GNUNET_malloc (sizeof (struct Plugin));
- plugin->api = api;
- plugin->library_name = libname;
- GNUNET_array_append (ctx->plugins,
- num_plugins,
- plugin);
- }
- pos = strtok (NULL, " ");
- }
- GNUNET_free (plugs);
- }
- GNUNET_array_append (ctx->plugins,
- num_plugins,
- NULL);
+ GNUNET_PLUGIN_load_all ("libgnunet_plugin_block_", NULL, &add_plugin, ctx);
return ctx;
}
unsigned int i;
struct Plugin *plugin;
- i = 0;
- while (NULL != (plugin = ctx->plugins[i]))
- {
- GNUNET_break (NULL ==
- GNUNET_PLUGIN_unload (plugin->library_name,
- plugin->api));
- GNUNET_free (plugin->library_name);
- GNUNET_free (plugin);
- i++;
- }
+ for (i = 0; i < ctx->num_plugins; i++)
+ {
+ plugin = ctx->plugins[i];
+ GNUNET_break (NULL ==
+ GNUNET_PLUGIN_unload (plugin->library_name, plugin->api));
+ GNUNET_free (plugin->library_name);
+ GNUNET_free (plugin);
+ }
GNUNET_free (ctx->plugins);
GNUNET_free (ctx);
}
* @return NULL if no matching plugin exists
*/
static struct GNUNET_BLOCK_PluginFunctions *
-find_plugin (struct GNUNET_BLOCK_Context *ctx,
- enum GNUNET_BLOCK_Type type)
+find_plugin (struct GNUNET_BLOCK_Context *ctx, enum GNUNET_BLOCK_Type type)
{
struct Plugin *plugin;
unsigned int i;
unsigned int j;
- i = 0;
- while (NULL != (plugin = ctx->plugins[i]))
+ for (i = 0; i < ctx->num_plugins; i++)
+ {
+ plugin = ctx->plugins[i];
+ j = 0;
+ while (0 != (plugin->api->types[j]))
{
- j = 0;
- while (0 != (plugin->api->types[j]))
- {
- if (type == plugin->api->types[j])
- return plugin->api;
- j++;
- }
- i++;
+ if (type == plugin->api->types[j])
+ return plugin->api;
+ j++;
}
+ }
return NULL;
}
/**
* 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
+ * 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.
*
*/
enum GNUNET_BLOCK_EvaluationResult
GNUNET_BLOCK_evaluate (struct GNUNET_BLOCK_Context *ctx,
- 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)
+ 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)
{
struct GNUNET_BLOCK_PluginFunctions *plugin = find_plugin (ctx, type);
if (plugin == NULL)
return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
- return plugin->evaluate (plugin->cls,
- type, query, bf, bf_mutator,
- xquery, xquery_size, reply_block, reply_block_size);
+ return plugin->evaluate (plugin->cls, type, query, bf, bf_mutator, xquery,
+ xquery_size, reply_block, reply_block_size);
}
*/
int
GNUNET_BLOCK_get_key (struct GNUNET_BLOCK_Context *ctx,
- enum GNUNET_BLOCK_Type type,
- const void *block,
- size_t block_size,
- GNUNET_HashCode *key)
+ enum GNUNET_BLOCK_Type type, const void *block,
+ size_t block_size, GNUNET_HashCode * key)
{
struct GNUNET_BLOCK_PluginFunctions *plugin = find_plugin (ctx, type);
if (plugin == NULL)
return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
- return plugin->get_key (plugin->cls,
- type, block, block_size, key);
+ return plugin->get_key (plugin->cls, type, block, block_size, key);
+}
+
+
+/**
+ * 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.
+ *
+ * @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 * GNUNET_CONSTANTS_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;
+}
+
+
+/**
+ * Construct a bloom filter that would filter out the given
+ * results.
+ *
+ * @param bf_mutator mutation value to use
+ * @param seen_results results already seen
+ * @param seen_results_count number of entries in 'seen_results'
+ * @return NULL if seen_results_count is 0, otherwise a BF
+ * that would match the given results.
+ */
+struct GNUNET_CONTAINER_BloomFilter *
+GNUNET_BLOCK_construct_bloomfilter (int32_t bf_mutator,
+ const GNUNET_HashCode * seen_results,
+ unsigned int seen_results_count)
+{
+ struct GNUNET_CONTAINER_BloomFilter *bf;
+ GNUNET_HashCode mhash;
+ unsigned int i;
+ size_t nsize;
+
+ nsize = compute_bloomfilter_size (seen_results_count);
+ bf = GNUNET_CONTAINER_bloomfilter_init (NULL, nsize,
+ GNUNET_CONSTANTS_BLOOMFILTER_K);
+ for (i = 0; i < seen_results_count; i++)
+ {
+ GNUNET_BLOCK_mingle_hash (&seen_results[i], bf_mutator, &mhash);
+ GNUNET_CONTAINER_bloomfilter_add (bf, &mhash);
+ }
+ return bf;
}
projects / oweals / gnunet.git / blobdiff