plugin_block_revocation.c File Reference

#include "platform.h"
#include "gnunet_signatures.h"
#include "gnunet_block_plugin.h"
#include "gnunet_gnsrecord_lib.h"
#include "gnunet_block_group_lib.h"
#include "../../service/revocation/revocation.h"
#include "gnunet_revocation_service.h"

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

Macros
#define	DEBUG_REVOCATION   GNUNET_EXTRA_LOGGING

Functions
static enum GNUNET_GenericReturnValue	block_plugin_revocation_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.
static enum GNUNET_GenericReturnValue	block_plugin_revocation_check_block (void *cls, enum GNUNET_BLOCK_Type type, const void *block, size_t block_size)
	Function called to validate a block for storage.
static enum GNUNET_BLOCK_ReplyEvaluationResult	block_plugin_revocation_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.
static enum GNUNET_GenericReturnValue	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.
void *	libgnunet_plugin_block_revocation_init (void *cls)
	Entry point for the plugin.
void *	libgnunet_plugin_block_revocation_done (void *cls)
	Exit point from the plugin.

Macro Definition Documentation

DEBUG_REVOCATION

#define DEBUG_REVOCATION   GNUNET_EXTRA_LOGGING

Definition at line 35 of file plugin_block_revocation.c.

Function Documentation

block_plugin_revocation_check_query()

static enum GNUNET_GenericReturnValue block_plugin_revocation_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
ctx	block context
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 59 of file plugin_block_revocation.c.

{
  (void) cls;
  (void) query;
  (void) xquery;
  if (GNUNET_BLOCK_TYPE_REVOCATION != type)
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  if (0 != xquery_size)
    return GNUNET_NO;
  return GNUNET_OK;
}

References GNUNET_BLOCK_TYPE_REVOCATION, GNUNET_break, GNUNET_NO, GNUNET_OK, GNUNET_SYSERR, and type.

Referenced by libgnunet_plugin_block_revocation_init().

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block_plugin_revocation_check_block()

static enum GNUNET_GenericReturnValue block_plugin_revocation_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 89 of file plugin_block_revocation.c.

{
  struct InternalContext *ic = cls;
  const struct RevokeMessage *rm = block;
  const struct GNUNET_GNSRECORD_PowP *pow
    = (const struct GNUNET_GNSRECORD_PowP *) &rm[1];
  struct GNUNET_CRYPTO_BlindablePublicKey pk;
  size_t pklen;
  size_t left;
 
  if (GNUNET_BLOCK_TYPE_REVOCATION != type)
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  if (block_size < sizeof(*rm) + sizeof(*pow))
  {
    GNUNET_break_op (0);
    return GNUNET_NO;
  }
  if (block_size != sizeof(*rm) + ntohl (rm->pow_size))
  {
    GNUNET_break_op (0);
    return GNUNET_NO;
  }
  left = block_size - sizeof (*rm) - sizeof (*pow);
  if (GNUNET_SYSERR ==
      GNUNET_CRYPTO_read_public_key_from_buffer (&pow[1],
                                                 left,
                                                 &pk,
                                                 &pklen))
  {
    GNUNET_break_op (0);
    return GNUNET_NO;
  }
  if (0 == pklen)
  {
    GNUNET_break_op (0);
    return GNUNET_NO;
  }
  if (GNUNET_YES !=
      GNUNET_GNSRECORD_check_pow (pow,
                                  ic->matching_bits,
                                  ic->epoch_duration))
  {
    GNUNET_break_op (0);
    return GNUNET_NO;
  }
  return GNUNET_OK;
}

References InternalContext::epoch_duration, GNUNET_BLOCK_TYPE_REVOCATION, GNUNET_break, GNUNET_break_op, GNUNET_CRYPTO_read_public_key_from_buffer(), GNUNET_GNSRECORD_check_pow(), GNUNET_NO, GNUNET_OK, GNUNET_SYSERR, GNUNET_YES, InternalContext::matching_bits, pk, GNUNET_GNSRECORD_PowP::pow, RevokeMessage::pow_size, and type.

Referenced by libgnunet_plugin_block_revocation_init().

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block_plugin_revocation_check_reply()

static enum GNUNET_BLOCK_ReplyEvaluationResult block_plugin_revocation_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 161 of file plugin_block_revocation.c.

{
  (void) cls;
  (void) group;
  (void) query;
  (void) xquery;
  (void) xquery_size;
  (void) reply_block;
  (void) reply_block_size;
  if (GNUNET_BLOCK_TYPE_REVOCATION != type)
  {
    GNUNET_break (0);
    return GNUNET_BLOCK_REPLY_TYPE_NOT_SUPPORTED;
  }
  return GNUNET_BLOCK_REPLY_OK_LAST;
}

References GNUNET_BLOCK_REPLY_OK_LAST, GNUNET_BLOCK_REPLY_TYPE_NOT_SUPPORTED, GNUNET_BLOCK_TYPE_REVOCATION, GNUNET_break, and type.

Referenced by libgnunet_plugin_block_revocation_init().

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block_plugin_revocation_get_key()

static enum GNUNET_GenericReturnValue 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 199 of file plugin_block_revocation.c.

{
  const struct RevokeMessage *rm = block;
  const struct GNUNET_GNSRECORD_PowP *pow
    = (const struct GNUNET_GNSRECORD_PowP *) &rm[1];
  struct GNUNET_CRYPTO_BlindablePublicKey pk;
  size_t pklen;
  size_t left;
 
  if (GNUNET_BLOCK_TYPE_REVOCATION != type)
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  if (block_size < sizeof(*rm) + sizeof(*pow))
  {
    GNUNET_break_op (0);
    return GNUNET_NO;
  }
  if (block_size != sizeof(*rm) + ntohl (rm->pow_size))
  {
    GNUNET_break_op (0);
    return GNUNET_NO;
  }
  left = block_size - sizeof (*rm) - sizeof (*pow);
  if (GNUNET_SYSERR == GNUNET_CRYPTO_read_public_key_from_buffer (&pow[1],
                                                                  left,
                                                                  &pk,
                                                                  &pklen))
  {
    GNUNET_break_op (0);
    return GNUNET_NO;
  }
  if (0 == pklen)
  {
    GNUNET_break_op (0);
    return GNUNET_NO;
  }
  GNUNET_CRYPTO_hash (&pow[1],
                      pklen,
                      key);
  return GNUNET_OK;
}

References GNUNET_BLOCK_TYPE_REVOCATION, GNUNET_break, GNUNET_break_op, GNUNET_CRYPTO_hash(), GNUNET_CRYPTO_read_public_key_from_buffer(), GNUNET_NO, GNUNET_OK, GNUNET_SYSERR, key, pk, GNUNET_GNSRECORD_PowP::pow, RevokeMessage::pow_size, and type.

Referenced by libgnunet_plugin_block_revocation_init().

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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 257 of file plugin_block_revocation.c.

{
  static const 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->get_key = &block_plugin_revocation_get_key;
  api->check_query = &block_plugin_revocation_check_query;
  api->check_block = &block_plugin_revocation_check_block;
  api->check_reply = &block_plugin_revocation_check_reply;
  api->create_group = NULL;
  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;
}

References block_plugin_revocation_check_block(), block_plugin_revocation_check_query(), block_plugin_revocation_check_reply(), block_plugin_revocation_get_key(), cfg, GNUNET_BLOCK_PluginFunctions::check_block, GNUNET_BLOCK_PluginFunctions::check_query, GNUNET_BLOCK_PluginFunctions::check_reply, GNUNET_BLOCK_PluginFunctions::cls, GNUNET_BLOCK_PluginFunctions::create_group, epoch_duration, InternalContext::epoch_duration, 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, matching_bits, InternalContext::matching_bits, and GNUNET_BLOCK_PluginFunctions::types.

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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 304 of file plugin_block_revocation.c.

{
  struct GNUNET_BLOCK_PluginFunctions *api = cls;
  struct InternalContext *ic = api->cls;
 
  GNUNET_free (ic);
  GNUNET_free (api);
  return NULL;
}

References GNUNET_BLOCK_PluginFunctions::cls, and GNUNET_free.