plugin_block_revocation.c File Reference

#include "platform.h"
#include "gnunet_signatures.h"
#include "gnunet_block_plugin.h"
#include "gnunet_block_group_lib.h"
#include "revocation.h"
#include "gnunet_revocation_service.h"

Include dependency graph for plugin_block_revocation.c:

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Data Structures
struct	InternalContext
	Context used inside the plugin. More...

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

Functions
static struct GNUNET_BLOCK_Group *	block_plugin_revocation_create_group (void *cls, enum GNUNET_BLOCK_Type type, uint32_t nonce, const void *raw_data, size_t raw_data_size, va_list va)
	Create a new block group. More...
static enum GNUNET_BLOCK_EvaluationResult	block_plugin_revocation_evaluate (void *cls, struct GNUNET_BLOCK_Context *ctx, enum GNUNET_BLOCK_Type type, struct GNUNET_BLOCK_Group *group, enum GNUNET_BLOCK_EvaluationOptions eo, 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 or a request. More...
static int	block_plugin_revocation_get_key (void *cls, enum GNUNET_BLOCK_Type type, const void *block, size_t block_size, struct GNUNET_HashCode *key)
	Function called to obtain the key for a block. More...
void *	libgnunet_plugin_block_revocation_init (void *cls)
	Entry point for the plugin. More...
void *	libgnunet_plugin_block_revocation_done (void *cls)
	Exit point from the plugin. More...

Macro Definition Documentation

DEBUG_REVOCATION

#define DEBUG_REVOCATION   GNUNET_EXTRA_LOGGING

Definition at line 34 of file plugin_block_revocation.c.

BLOOMFILTER_K

#define BLOOMFILTER_K   16

Number of bits we set per entry in the bloomfilter.

Do not change!

Definition at line 40 of file plugin_block_revocation.c.

Referenced by block_plugin_revocation_create_group().

REVOCATION_BF_SIZE

#define REVOCATION_BF_SIZE   8

How big is the BF we use for DHT blocks?

Definition at line 46 of file plugin_block_revocation.c.

Referenced by block_plugin_revocation_create_group().

Function Documentation

block_plugin_revocation_create_group()

static struct GNUNET_BLOCK_Group* block_plugin_revocation_create_group ( void *  cls, enum GNUNET_BLOCK_Type  type, uint32_t  nonce, 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
nonce	random value used to seed the group creation
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 72 of file plugin_block_revocation.c.

References BLOOMFILTER_K, GNUNET_BLOCK_GROUP_bf_create(), GNUNET_BLOCK_GROUP_compute_bloomfilter_size(), GNUNET_break, and REVOCATION_BF_SIZE.

Referenced by libgnunet_plugin_block_revocation_init().

{
  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 = REVOCATION_BF_SIZE;
  }
  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);
}

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block_plugin_revocation_evaluate()

static enum GNUNET_BLOCK_EvaluationResult block_plugin_revocation_evaluate ( void *  cls, struct GNUNET_BLOCK_Context *  ctx, enum GNUNET_BLOCK_Type  type, struct GNUNET_BLOCK_Group *  group, enum GNUNET_BLOCK_EvaluationOptions  eo, 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 or a request.

For request evaluation, simply pass "NULL" for the reply_block.

Parameters

cls	our struct InternalContext
ctx	context
type	block type
group	block group to use
eo	control flags
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 124 of file plugin_block_revocation.c.

References InternalContext::epoch_duration, GNUNET_BLOCK_EVALUATION_OK_DUPLICATE, GNUNET_BLOCK_EVALUATION_REQUEST_VALID, GNUNET_BLOCK_EVALUATION_RESULT_INVALID, GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED, GNUNET_BLOCK_GROUP_bf_test_and_set(), GNUNET_break_op, GNUNET_CRYPTO_hash(), GNUNET_REVOCATION_check_pow(), GNUNET_YES, GNUNET_REVOCATION_PowP::key, InternalContext::matching_bits, and RevokeMessage::proof_of_work.

Referenced by libgnunet_plugin_block_revocation_init().

{
  struct InternalContext *ic = cls;
  struct GNUNET_HashCode chash;
  const struct RevokeMessage *rm = reply_block;

  if (NULL == reply_block)
    return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
  if (reply_block_size != sizeof(*rm))
  {
    GNUNET_break_op (0);
    return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
  }
  if (0 >=
      GNUNET_REVOCATION_check_pow (&rm->proof_of_work,
                                   ic->matching_bits,
                                   ic->epoch_duration))
  {
    GNUNET_break_op (0);
    return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
  }
  GNUNET_CRYPTO_hash (&rm->proof_of_work.key,
                      sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey),
                      &chash);
  if (GNUNET_YES ==
      GNUNET_BLOCK_GROUP_bf_test_and_set (group,
                                          &chash))
    return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
  return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
}

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block_plugin_revocation_get_key()

static int block_plugin_revocation_get_key ( void *  cls, enum GNUNET_BLOCK_Type  type, const void *  block, size_t  block_size, struct GNUNET_HashCode *  key  )

static

Function called to obtain the key for a block.

Parameters

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

Returns

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

Definition at line 177 of file plugin_block_revocation.c.

References GNUNET_break_op, GNUNET_CRYPTO_hash(), GNUNET_OK, GNUNET_SYSERR, GNUNET_REVOCATION_PowP::key, and RevokeMessage::proof_of_work.

Referenced by libgnunet_plugin_block_revocation_init().

{
  const struct RevokeMessage *rm = block;

  if (block_size != sizeof(*rm))
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  GNUNET_CRYPTO_hash (&rm->proof_of_work.key,
                      sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey),
                      key);
  return GNUNET_OK;
}

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libgnunet_plugin_block_revocation_init()

void* libgnunet_plugin_block_revocation_init

(

void *

cls

)

Entry point for the plugin.

Parameters

cls	the configuration to use

Definition at line 203 of file plugin_block_revocation.c.

References block_plugin_revocation_create_group(), block_plugin_revocation_evaluate(), block_plugin_revocation_get_key(), cfg, GNUNET_BLOCK_PluginFunctions::cls, GNUNET_BLOCK_PluginFunctions::create_group, InternalContext::epoch_duration, GNUNET_BLOCK_PluginFunctions::evaluate, GNUNET_BLOCK_PluginFunctions::get_key, GNUNET_BLOCK_TYPE_ANY, GNUNET_BLOCK_TYPE_REVOCATION, GNUNET_CONFIGURATION_get_value_number(), GNUNET_CONFIGURATION_get_value_time(), GNUNET_new, GNUNET_OK, InternalContext::matching_bits, and GNUNET_BLOCK_PluginFunctions::types.

{
  static enum GNUNET_BLOCK_Type types[] = {
    GNUNET_BLOCK_TYPE_REVOCATION,
    GNUNET_BLOCK_TYPE_ANY       /* end of list */
  };
  const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
  struct GNUNET_BLOCK_PluginFunctions *api;
  struct InternalContext *ic;
  unsigned long long matching_bits;
  struct GNUNET_TIME_Relative epoch_duration;

  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_number (cfg,
                                             "REVOCATION",
                                             "WORKBITS",
                                             &matching_bits))
    return NULL;
  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_time (cfg,
                                           "REVOCATION",
                                           "EPOCH_DURATION",
                                           &epoch_duration))
    return NULL;

  api = GNUNET_new (struct GNUNET_BLOCK_PluginFunctions);
  api->evaluate = &block_plugin_revocation_evaluate;
  api->get_key = &block_plugin_revocation_get_key;
  api->create_group = &block_plugin_revocation_create_group;
  api->types = types;
  ic = GNUNET_new (struct InternalContext);
  ic->matching_bits = (unsigned int) matching_bits;
  ic->epoch_duration = epoch_duration;
  api->cls = ic;
  return api;
}

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libgnunet_plugin_block_revocation_done()

void* libgnunet_plugin_block_revocation_done

(

void *

cls

)

Exit point from the plugin.

Definition at line 245 of file plugin_block_revocation.c.

References GNUNET_BLOCK_PluginFunctions::cls, and GNUNET_free.

{
  struct GNUNET_BLOCK_PluginFunctions *api = cls;
  struct InternalContext *ic = api->cls;

  GNUNET_free (ic);
  GNUNET_free (api);
  return NULL;
}