GNUnet  0.10.x
Macros | Functions
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_Groupblock_plugin_gns_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_gns_evaluate (void *cls, struct GNUNET_BLOCK_Context *ctx, enum GNUNET_BLOCK_Type type, struct GNUNET_BLOCK_Group *bg, 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_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...
 
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.

Referenced by block_plugin_gns_create_group().

◆ 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.

Referenced by block_plugin_gns_create_group().

Function Documentation

◆ block_plugin_gns_create_group()

static struct GNUNET_BLOCK_Group* block_plugin_gns_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
ctxblock context in which the block group is created
typetype of the block for which we are creating the group
noncerandom value used to seed the group creation
raw_dataoptional serialized prior state of the group, NULL if unavailable/fresh
raw_data_sizenumber of bytes in raw_data, 0 if unavailable/fresh
vavariable 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 59 of file plugin_block_gns.c.

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

Referenced by libgnunet_plugin_block_gns_init().

65 {
66  unsigned int bf_size;
67  const char *guard;
68 
69  guard = va_arg(va, const char *);
70  if (0 == strcmp(guard,
71  "seen-set-size"))
72  bf_size = GNUNET_BLOCK_GROUP_compute_bloomfilter_size(va_arg(va, unsigned int),
74  else if (0 == strcmp(guard,
75  "filter-size"))
76  bf_size = va_arg(va, unsigned int);
77  else
78  {
79  GNUNET_break(0);
80  bf_size = GNS_BF_SIZE;
81  }
82  GNUNET_break(NULL == va_arg(va, const char *));
84  bf_size,
86  type,
87  nonce,
88  raw_data,
89  raw_data_size);
90 }
struct GNUNET_BLOCK_Group * GNUNET_BLOCK_GROUP_bf_create(void *cls, size_t bf_size, unsigned int bf_k, enum GNUNET_BLOCK_Type type, uint32_t nonce, const void *raw_data, size_t raw_data_size)
Create a new block group that filters duplicates using a Bloom filter.
Definition: bg_bf.c:173
size_t GNUNET_BLOCK_GROUP_compute_bloomfilter_size(unsigned int entry_count, unsigned int k)
How many bytes should a bloomfilter be if we have already seen entry_count responses? Sized so that do not have to re-size the filter too often (to keep it cheap).
Definition: bg_bf.c:248
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
#define GNS_BF_SIZE
How big is the BF we use for GNS blocks?
#define BLOOMFILTER_K
Number of bits we set per entry in the bloomfilter.
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model
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◆ block_plugin_gns_evaluate()

static enum GNUNET_BLOCK_EvaluationResult block_plugin_gns_evaluate ( void *  cls,
struct GNUNET_BLOCK_Context ctx,
enum GNUNET_BLOCK_Type  type,
struct GNUNET_BLOCK_Group bg,
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. 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.

Parameters
clsclosure
ctxblock context
typeblock type
bgblock group to use for evaluation
eocontrol flags
queryoriginal query (hash)
xqueryextrended query data (can be NULL, depending on type)
xquery_sizenumber of bytes in xquery
reply_blockresponse to validate
reply_block_sizenumber of bytes in reply_block
Returns
characterization of result

Definition at line 113 of file plugin_block_gns.c.

References GNUNET_GNSRECORD_Block::derived_key, GNUNET_BLOCK_EVALUATION_OK_DUPLICATE, GNUNET_BLOCK_EVALUATION_OK_MORE, GNUNET_BLOCK_EVALUATION_REQUEST_INVALID, GNUNET_BLOCK_EVALUATION_REQUEST_VALID, GNUNET_BLOCK_EVALUATION_RESULT_INVALID, GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED, GNUNET_BLOCK_GROUP_bf_test_and_set(), GNUNET_BLOCK_TYPE_GNS_NAMERECORD, GNUNET_break_op, GNUNET_CRYPTO_hash(), GNUNET_GNSRECORD_block_verify(), GNUNET_memcmp, GNUNET_OK, GNUNET_YES, GNUNET_GNSRECORD_Block::purpose, and GNUNET_CRYPTO_EccSignaturePurpose::size.

Referenced by libgnunet_plugin_block_gns_init().

123 {
124  const struct GNUNET_GNSRECORD_Block *block;
125  struct GNUNET_HashCode h;
126  struct GNUNET_HashCode chash;
127 
130  if (NULL == reply_block)
131  {
132  if (0 != xquery_size)
133  {
134  GNUNET_break_op(0);
136  }
138  }
139 
140  /* this is a reply */
141  if (reply_block_size < sizeof(struct GNUNET_GNSRECORD_Block))
142  {
143  GNUNET_break_op(0);
145  }
146  block = reply_block;
147  if (ntohl(block->purpose.size) + sizeof(struct GNUNET_CRYPTO_EcdsaSignature) + sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey) !=
148  reply_block_size)
149  {
150  GNUNET_break_op(0);
152  }
154  sizeof(block->derived_key),
155  &h);
156  if (0 != GNUNET_memcmp(&h, query))
157  {
158  GNUNET_break_op(0);
160  }
161  if (GNUNET_OK !=
163  {
164  GNUNET_break_op(0);
166  }
167  GNUNET_CRYPTO_hash(reply_block,
168  reply_block_size,
169  &chash);
170  if (GNUNET_YES ==
172  &chash))
175 }
Block does not match query (invalid result)
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
Information we have in an encrypted block with record data (i.e.
static struct GNUNET_ARM_Handle * h
Connection with ARM.
Definition: gnunet-arm.c:94
Valid result, but suppressed because it is a duplicate.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:44
an ECC signature using ECDSA
uint32_t size
How many bytes does this signature sign? (including this purpose header); in network byte order (!)...
Block for storing record data.
A 512-bit hashcode.
Valid result, and there may be more.
int GNUNET_GNSRECORD_block_verify(const struct GNUNET_GNSRECORD_Block *block)
Check if a signature is valid.
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
Specified block type not supported by this plugin.
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and ECDS...
Query format does not match block type (invalid query).
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model
#define GNUNET_YES
Definition: gnunet_common.h:77
int GNUNET_BLOCK_GROUP_bf_test_and_set(struct GNUNET_BLOCK_Group *bg, const struct GNUNET_HashCode *hc)
Test if hc is contained in the Bloom filter of bg.
Definition: bg_bf.c:212
struct GNUNET_CRYPTO_EccSignaturePurpose purpose
Number of bytes signed; also specifies the number of bytes of encrypted data that follow...
Query is valid, no reply given.
struct GNUNET_CRYPTO_EcdsaPublicKey derived_key
Derived key used for signing; hash of this is the query.
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◆ block_plugin_gns_get_key()

static int 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.

Parameters
clsclosure
typeblock type
reply_blockblock to get the key for
reply_block_sizenumber of bytes in reply_block
keyset 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 190 of file plugin_block_gns.c.

References GNUNET_GNSRECORD_Block::derived_key, GNUNET_BLOCK_EVALUATION_RESULT_INVALID, GNUNET_BLOCK_TYPE_GNS_NAMERECORD, GNUNET_break_op, GNUNET_CRYPTO_hash(), GNUNET_OK, and GNUNET_SYSERR.

Referenced by libgnunet_plugin_block_gns_init().

195 {
196  const struct GNUNET_GNSRECORD_Block *block;
197 
199  return GNUNET_SYSERR;
200  if (reply_block_size < sizeof(struct GNUNET_GNSRECORD_Block))
201  {
202  GNUNET_break_op(0);
204  }
205  block = reply_block;
207  sizeof(block->derived_key),
208  key);
209  return GNUNET_OK;
210 }
Block does not match query (invalid result)
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
Information we have in an encrypted block with record data (i.e.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:44
Block for storing record data.
#define GNUNET_SYSERR
Definition: gnunet_common.h:76
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model
struct GNUNET_CRYPTO_EcdsaPublicKey derived_key
Derived key used for signing; hash of this is the query.
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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 217 of file plugin_block_gns.c.

References block_plugin_gns_create_group(), block_plugin_gns_evaluate(), block_plugin_gns_get_key(), GNUNET_BLOCK_PluginFunctions::create_group, GNUNET_BLOCK_PluginFunctions::evaluate, GNUNET_BLOCK_PluginFunctions::get_key, GNUNET_BLOCK_TYPE_ANY, GNUNET_BLOCK_TYPE_GNS_NAMERECORD, GNUNET_new, and GNUNET_BLOCK_PluginFunctions::types.

218 {
219  static enum GNUNET_BLOCK_Type types[] =
220  {
222  GNUNET_BLOCK_TYPE_ANY /* end of list */
223  };
224  struct GNUNET_BLOCK_PluginFunctions *api;
225 
230  api->types = types;
231  return api;
232 }
enum GNUNET_BLOCK_Type * types
0-terminated array of block types supported by this plugin.
Any type of block, used as a wildcard when searching.
GNUNET_BLOCK_EvaluationFunction evaluate
Main function of a block plugin.
static struct GNUNET_BLOCK_Group * block_plugin_gns_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.
GNUNET_BLOCK_Type
Blocks in the datastore and the datacache must have a unique type.
Each plugin is required to return a pointer to a struct of this type as the return value from its ent...
static enum GNUNET_BLOCK_EvaluationResult block_plugin_gns_evaluate(void *cls, struct GNUNET_BLOCK_Context *ctx, enum GNUNET_BLOCK_Type type, struct GNUNET_BLOCK_Group *bg, 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.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
Block for storing record data.
static int 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.
GNUNET_BLOCK_GroupCreateFunction create_group
Create a block group to process a bunch of blocks in a shared context (i.e.
GNUNET_BLOCK_GetKeyFunction get_key
Obtain the key for a given block (if possible).
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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 239 of file plugin_block_gns.c.

References GNUNET_BLOCK_PluginFunctions::cls, and GNUNET_free.

240 {
241  struct GNUNET_BLOCK_PluginFunctions *api = cls;
242 
243  GNUNET_free(api);
244  return NULL;
245 }
Each plugin is required to return a pointer to a struct of this type as the return value from its ent...
void * cls
Closure for all of the callbacks.
#define GNUNET_free(ptr)
Wrapper around free.