plugin_block_gns.c File Reference

blocks used for GNS records More...

#include "platform.h"
#include "gnunet_block_group_lib.h"
#include "gnunet_block_plugin.h"
#include "gnunet_namestore_service.h"
#include "gnunet_signatures.h"

Include dependency graph for plugin_block_gns.c:

Go to the source code of this file.

Macros
#define	BLOOMFILTER_K   16
	Number of bits we set per entry in the bloomfilter. More...
#define	GNS_BF_SIZE   8
	How big is the BF we use for GNS blocks? More...

Functions
static struct GNUNET_BLOCK_Group *	block_plugin_gns_create_group (void *cls, enum GNUNET_BLOCK_Type type, const void *raw_data, size_t raw_data_size, va_list va)
	Create a new block group. More...
static enum GNUNET_GenericReturnValue	block_plugin_gns_get_key (void *cls, enum GNUNET_BLOCK_Type type, const void *reply_block, size_t reply_block_size, struct GNUNET_HashCode *key)
	Function called to obtain the key for a block. More...
static enum GNUNET_GenericReturnValue	block_plugin_gns_check_query (void *cls, enum GNUNET_BLOCK_Type type, const struct GNUNET_HashCode *query, const void *xquery, size_t xquery_size)
	Function called to validate a query. More...
static enum GNUNET_GenericReturnValue	block_plugin_gns_check_block (void *cls, enum GNUNET_BLOCK_Type type, const void *block, size_t block_size)
	Function called to validate a block for storage. More...
static enum GNUNET_BLOCK_ReplyEvaluationResult	block_plugin_gns_check_reply (void *cls, enum GNUNET_BLOCK_Type type, struct GNUNET_BLOCK_Group *group, const struct GNUNET_HashCode *query, const void *xquery, size_t xquery_size, const void *reply_block, size_t reply_block_size)
	Function called to validate a reply to a request. More...
void *	libgnunet_plugin_block_gns_init (void *cls)
	Entry point for the plugin. More...
void *	libgnunet_plugin_block_gns_done (void *cls)
	Exit point from the plugin. More...

Detailed Description

blocks used for GNS records

Author

Martin Schanzenbach

Christian Grothoff

Definition in file plugin_block_gns.c.

Macro Definition Documentation

BLOOMFILTER_K

#define BLOOMFILTER_K   16

Number of bits we set per entry in the bloomfilter.

Do not change! -from fs

Definition at line 38 of file plugin_block_gns.c.

GNS_BF_SIZE

#define GNS_BF_SIZE   8

How big is the BF we use for GNS blocks?

Definition at line 43 of file plugin_block_gns.c.

Function Documentation

block_plugin_gns_create_group()

static struct GNUNET_BLOCK_Group* block_plugin_gns_create_group ( void *  cls, enum GNUNET_BLOCK_Type  type, const void *  raw_data, size_t  raw_data_size, va_list  va  )

static

Create a new block group.

Parameters

ctx	block context in which the block group is created
type	type of the block for which we are creating the group
raw_data	optional serialized prior state of the group, NULL if unavailable/fresh
raw_data_size	number of bytes in raw_data, 0 if unavailable/fresh
va	variable arguments specific to type

Returns

block group handle, NULL if block groups are not supported by this type of block (this is not an error)

Definition at line 58 of file plugin_block_gns.c.

{
  unsigned int bf_size;
  const char *guard;
 
  guard = va_arg (va, const char *);
  if (0 == strcmp (guard,
                   "seen-set-size"))
    bf_size = GNUNET_BLOCK_GROUP_compute_bloomfilter_size (va_arg (va, unsigned
                                                                   int),
                                                           BLOOMFILTER_K);
  else if (0 == strcmp (guard,
                        "filter-size"))
    bf_size = va_arg (va, unsigned int);
  else
  {
    GNUNET_break (0);
    bf_size = GNS_BF_SIZE;
  }
  GNUNET_break (NULL == va_arg (va, const char *));
  return GNUNET_BLOCK_GROUP_bf_create (cls,
                                       bf_size,
                                       BLOOMFILTER_K,
                                       type,
                                       raw_data,
                                       raw_data_size);
}

Referenced by libgnunet_plugin_block_gns_init().

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block_plugin_gns_get_key()

static enum GNUNET_GenericReturnValue block_plugin_gns_get_key ( void *  cls, enum GNUNET_BLOCK_Type  type, const void *  reply_block, size_t  reply_block_size, struct GNUNET_HashCode *  key  )

static

Function called to obtain the key for a block.

If the block is malformed, the function should zero-out key and return GNUNET_OK.

Parameters

cls	closure
type	block type
reply_block	block to get the key for
reply_block_size	number of bytes in reply_block
key	set to the key (query) for the given block

Returns

GNUNET_OK on success, GNUNET_SYSERR if type not supported, GNUNET_NO if extracting a key from a block of this type does not work

Definition at line 58 of file plugin_block_gns.c.

{
  const struct GNUNET_GNSRECORD_Block *block;
 
  if (GNUNET_BLOCK_TYPE_GNS_NAMERECORD != type)
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  if (reply_block_size < sizeof(struct GNUNET_GNSRECORD_Block))
  {
    GNUNET_break_op (0);
    memset (key,
            0,
            sizeof (*key));
    return GNUNET_OK;
  }
  block = reply_block;
  GNUNET_GNSRECORD_query_from_block (block,
                                     key);
  return GNUNET_OK;
}

Referenced by libgnunet_plugin_block_gns_init().

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block_plugin_gns_check_query()

static enum GNUNET_GenericReturnValue block_plugin_gns_check_query ( void *  cls, enum GNUNET_BLOCK_Type  type, const struct GNUNET_HashCode *  query, const void *  xquery, size_t  xquery_size  )

static

Function called to validate a query.

Parameters

cls	closure
type	block type
query	original query (hash)
xquery	extrended query data (can be NULL, depending on type)
xquery_size	number of bytes in xquery

Returns

GNUNET_OK if the query is fine, GNUNET_NO if not

Definition at line 58 of file plugin_block_gns.c.

{
  if (GNUNET_BLOCK_TYPE_GNS_NAMERECORD != type)
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  if (0 != xquery_size)
  {
    GNUNET_break_op (0);
    return GNUNET_NO;
  }
  return GNUNET_OK;
}

Referenced by libgnunet_plugin_block_gns_init().

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block_plugin_gns_check_block()

static enum GNUNET_GenericReturnValue block_plugin_gns_check_block ( void *  cls, enum GNUNET_BLOCK_Type  type, const void *  block, size_t  block_size  )

static

Function called to validate a block for storage.

Parameters

cls	closure
type	block type
block	block data to validate
block_size	number of bytes in block

Returns

GNUNET_OK if the block is fine, GNUNET_NO if not

Definition at line 58 of file plugin_block_gns.c.

{
  const struct GNUNET_GNSRECORD_Block *gblock;
 
  if (GNUNET_BLOCK_TYPE_GNS_NAMERECORD != type)
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  if (block_size < sizeof(struct GNUNET_GNSRECORD_Block))
  {
    GNUNET_break_op (0);
    return GNUNET_NO;
  }
  gblock = block;
  if (GNUNET_GNSRECORD_block_get_size (gblock) > block_size)
  {
    GNUNET_break_op (0);
    return GNUNET_NO;
  }
  if (GNUNET_OK !=
      GNUNET_GNSRECORD_block_verify (gblock))
  {
    GNUNET_break_op (0);
    return GNUNET_NO;
  }
  return GNUNET_OK;
}

References BLOOMFILTER_K, GNS_BF_SIZE, GNUNET_BLOCK_GROUP_bf_create(), GNUNET_BLOCK_GROUP_compute_bloomfilter_size(), GNUNET_break, and type.

Referenced by libgnunet_plugin_block_gns_init().

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block_plugin_gns_check_reply()

static enum GNUNET_BLOCK_ReplyEvaluationResult block_plugin_gns_check_reply ( void *  cls, enum GNUNET_BLOCK_Type  type, struct GNUNET_BLOCK_Group *  group, const struct GNUNET_HashCode *  query, const void *  xquery, size_t  xquery_size, const void *  reply_block, size_t  reply_block_size  )

static

Function called to validate a reply to a request.

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 GetKeyFunction and the BlockEvaluationFunction.

Parameters

cls	closure
type	block type
group	which block group to use for evaluation
query	original query (hash)
xquery	extrended query data (can be NULL, depending on type)
xquery_size	number of bytes in xquery
reply_block	response to validate
reply_block_size	number of bytes in reply_block

Returns

characterization of result

Definition at line 58 of file plugin_block_gns.c.

{
  const struct GNUNET_GNSRECORD_Block *block = reply_block;
  struct GNUNET_HashCode chash;
 
  if (GNUNET_BLOCK_TYPE_GNS_NAMERECORD != type)
  {
    GNUNET_break (0);
    return GNUNET_BLOCK_REPLY_TYPE_NOT_SUPPORTED;
  }
  GNUNET_assert (reply_block_size >= sizeof(struct GNUNET_GNSRECORD_Block));
  GNUNET_assert (reply_block_size >= GNUNET_GNSRECORD_block_get_size (block));
  GNUNET_CRYPTO_hash (reply_block,
                      reply_block_size,
                      &chash);
  if (GNUNET_YES ==
      GNUNET_BLOCK_GROUP_bf_test_and_set (group,
                                          &chash))
    return GNUNET_BLOCK_REPLY_OK_DUPLICATE;
  return GNUNET_BLOCK_REPLY_OK_MORE;
}

Referenced by libgnunet_plugin_block_gns_init().

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libgnunet_plugin_block_gns_init()

void* libgnunet_plugin_block_gns_init

(

void *

cls

)

Entry point for the plugin.

Definition at line 257 of file plugin_block_gns.c.

{
  static const enum GNUNET_BLOCK_Type types[] = {
    GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
    GNUNET_BLOCK_TYPE_ANY       /* end of list */
  };
  struct GNUNET_BLOCK_PluginFunctions *api;
 
  api = GNUNET_new (struct GNUNET_BLOCK_PluginFunctions);
  api->get_key = &block_plugin_gns_get_key;
  api->create_group = &block_plugin_gns_create_group;
  api->check_query = &block_plugin_gns_check_query;
  api->check_block = &block_plugin_gns_check_block;
  api->check_reply = &block_plugin_gns_check_reply;
  api->types = types;
  return api;
}

References block_plugin_gns_check_block(), block_plugin_gns_check_query(), block_plugin_gns_check_reply(), block_plugin_gns_create_group(), block_plugin_gns_get_key(), GNUNET_BLOCK_PluginFunctions::check_block, GNUNET_BLOCK_PluginFunctions::check_query, GNUNET_BLOCK_PluginFunctions::check_reply, GNUNET_BLOCK_PluginFunctions::create_group, GNUNET_BLOCK_PluginFunctions::get_key, GNUNET_BLOCK_TYPE_ANY, GNUNET_BLOCK_TYPE_GNS_NAMERECORD, GNUNET_new, and GNUNET_BLOCK_PluginFunctions::types.

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libgnunet_plugin_block_gns_done()

void* libgnunet_plugin_block_gns_done

(

void *

cls

)

Exit point from the plugin.

Definition at line 280 of file plugin_block_gns.c.

{
  struct GNUNET_BLOCK_PluginFunctions *api = cls;
 
  GNUNET_free (api);
  return NULL;
}

References GNUNET_BLOCK_PluginFunctions::cls, and GNUNET_free.