GNUnet  0.10.x
Typedefs | Functions
fs_publish_ublock.h File Reference

publish a UBLOCK in GNUnet More...

#include "gnunet_util_lib.h"
#include "gnunet_datastore_service.h"
#include "gnunet_fs_service.h"
#include "gnunet_identity_service.h"
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Typedefs

typedef void(* GNUNET_FS_UBlockContinuation) (void *cls, const char *emsg)
 Signature of a function called as the continuation of a UBlock publication. More...
 

Functions

void GNUNET_FS_ublock_decrypt_ (const void *input, size_t input_len, const struct GNUNET_CRYPTO_EcdsaPublicKey *ns, const char *label, void *output)
 Decrypt the given UBlock, storing the result in output. More...
 
struct GNUNET_FS_PublishUblockContextGNUNET_FS_publish_ublock_ (struct GNUNET_FS_Handle *h, struct GNUNET_DATASTORE_Handle *dsh, const char *label, const char *ulabel, const struct GNUNET_CRYPTO_EcdsaPrivateKey *ns, const struct GNUNET_CONTAINER_MetaData *meta, const struct GNUNET_FS_Uri *uri, const struct GNUNET_FS_BlockOptions *bo, enum GNUNET_FS_PublishOptions options, GNUNET_FS_UBlockContinuation cont, void *cont_cls)
 Publish a UBlock. More...
 
void GNUNET_FS_publish_ublock_cancel_ (struct GNUNET_FS_PublishUblockContext *uc)
 Abort UBlock publishing operation. More...
 

Detailed Description

publish a UBLOCK in GNUnet

See also
https://gnunet.org/encoding and #2564
Author
Krista Bennett
Christian Grothoff

Definition in file fs_publish_ublock.h.

Typedef Documentation

◆ GNUNET_FS_UBlockContinuation

typedef void(* GNUNET_FS_UBlockContinuation) (void *cls, const char *emsg)

Signature of a function called as the continuation of a UBlock publication.

Parameters
clsclosure
emsgerror message, NULL on success

Definition at line 67 of file fs_publish_ublock.h.

Function Documentation

◆ GNUNET_FS_ublock_decrypt_()

void GNUNET_FS_ublock_decrypt_ ( const void *  input,
size_t  input_len,
const struct GNUNET_CRYPTO_EcdsaPublicKey ns,
const char *  label,
void *  output 
)

Decrypt the given UBlock, storing the result in output.

Parameters
inputinput data
input_lennumber of bytes in input
nspublic key under which the UBlock was stored
labellabel under which the UBlock was stored
outputwhere to write the result, has input_len bytes
inputinput data
input_lennumber of bytes in input
nspublic key under which the UBlock was stored
labellabel under which the UBlock was stored
outputwhere to write the result, has input_len bytes

Definition at line 74 of file fs_publish_ublock.c.

References derive_ublock_encryption_key(), and GNUNET_CRYPTO_symmetric_decrypt().

Referenced by decrypt_block_with_keyword(), process_kblock_for_unindex(), and process_sblock().

79 {
82 
83  derive_ublock_encryption_key (&skey, &iv,
84  label, ns);
85  GNUNET_CRYPTO_symmetric_decrypt (input, input_len,
86  &skey, &iv,
87  output);
88 }
ssize_t GNUNET_CRYPTO_symmetric_decrypt(const void *block, size_t size, const struct GNUNET_CRYPTO_SymmetricSessionKey *sessionkey, const struct GNUNET_CRYPTO_SymmetricInitializationVector *iv, void *result)
Decrypt a given block using a symmetric sessionkey.
static void derive_ublock_encryption_key(struct GNUNET_CRYPTO_SymmetricSessionKey *skey, struct GNUNET_CRYPTO_SymmetricInitializationVector *iv, const char *label, const struct GNUNET_CRYPTO_EcdsaPublicKey *pub)
Derive the key for symmetric encryption/decryption from the public key and the label.
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◆ GNUNET_FS_publish_ublock_()

struct GNUNET_FS_PublishUblockContext* GNUNET_FS_publish_ublock_ ( struct GNUNET_FS_Handle h,
struct GNUNET_DATASTORE_Handle dsh,
const char *  label,
const char *  ulabel,
const struct GNUNET_CRYPTO_EcdsaPrivateKey ns,
const struct GNUNET_CONTAINER_MetaData meta,
const struct GNUNET_FS_Uri uri,
const struct GNUNET_FS_BlockOptions bo,
enum GNUNET_FS_PublishOptions  options,
GNUNET_FS_UBlockContinuation  cont,
void *  cont_cls 
)

Publish a UBlock.

Parameters
hhandle to the file sharing subsystem
dshdatastore handle to use for storage operation
labelidentifier to use
ulabelupdate label to use, may be an empty string for none
nsnamespace to publish in
metametadata to use
uriURI to refer to in the UBlock
boper-block options
optionspublication options
contcontinuation
cont_clsclosure for cont
Returns
NULL on error ('cont' will still be called)
Parameters
hhandle to the file sharing subsystem
dshdatastore handle to use for storage operation
labelidentifier to use
ulabelupdate label to use, may be an empty string for none
nsnamespace to publish in
metametadata to use
uriURI to refer to in the UBlock
boper-block options
optionspublication options
contcontinuation
cont_clsclosure for cont
Returns
NULL on error (cont will still be called)

Definition at line 179 of file fs_publish_ublock.c.

References _, GNUNET_FS_BlockOptions::anonymity_level, GNUNET_FS_PublishUblockContext::cont, GNUNET_FS_PublishUblockContext::cont_cls, GNUNET_FS_BlockOptions::content_priority, derive_ublock_encryption_key(), GNUNET_FS_BlockOptions::expiration_time, GNUNET_assert, GNUNET_BLOCK_TYPE_FS_UBLOCK, GNUNET_break, GNUNET_CONTAINER_meta_data_get_serialized_size(), GNUNET_CONTAINER_meta_data_serialize(), GNUNET_CONTAINER_META_DATA_SERIALIZE_PART, GNUNET_CRYPTO_ecdsa_key_get_public(), GNUNET_CRYPTO_ecdsa_private_key_derive(), GNUNET_CRYPTO_ecdsa_sign(), GNUNET_CRYPTO_hash(), GNUNET_CRYPTO_symmetric_encrypt(), GNUNET_DATASTORE_put(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_FS_uri_to_string(), GNUNET_log, GNUNET_malloc, GNUNET_memcpy, GNUNET_new, GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_SIGNATURE_PURPOSE_FS_UBLOCK, MAX_UBLOCK_SIZE, GNUNET_CRYPTO_EccSignaturePurpose::purpose, UBlock::purpose, GNUNET_FS_PublishUblockContext::qre, GNUNET_FS_BlockOptions::replication_level, run_cont(), UBlock::signature, size, GNUNET_CRYPTO_EccSignaturePurpose::size, GNUNET_FS_PublishUblockContext::task, ublock_put_cont(), uc, and UBlock::verification_key.

Referenced by GNUNET_FS_publish_sks(), and publish_ksk_cont().

189 {
191  struct GNUNET_HashCode query;
194  struct GNUNET_CRYPTO_EcdsaPrivateKey *nsd;
196  char *uris;
197  size_t size;
198  char *kbe;
199  char *sptr;
200  ssize_t mdsize;
201  size_t slen;
202  size_t ulen;
203  struct UBlock *ub_plain;
204  struct UBlock *ub_enc;
205 
206  /* compute ublock to publish */
207  if (NULL == meta)
208  mdsize = 0;
209  else
211  GNUNET_assert (mdsize >= 0);
212  uris = GNUNET_FS_uri_to_string (uri);
213  slen = strlen (uris) + 1;
214  if (NULL == ulabel)
215  ulen = 1;
216  else
217  ulen = strlen (ulabel) + 1;
218  size = mdsize + sizeof (struct UBlock) + slen + ulen;
219  if (size > MAX_UBLOCK_SIZE)
220  {
221  size = MAX_UBLOCK_SIZE;
222  mdsize = size - sizeof (struct UBlock) - (slen + ulen);
223  }
224  ub_plain = GNUNET_malloc (size);
225  kbe = (char *) &ub_plain[1];
226  if (NULL != ulabel)
227  GNUNET_memcpy (kbe, ulabel, ulen);
228  kbe += ulen;
229  GNUNET_memcpy (kbe, uris, slen);
230  kbe += slen;
231  GNUNET_free (uris);
232  sptr = kbe;
233  if (NULL != meta)
234  mdsize =
235  GNUNET_CONTAINER_meta_data_serialize (meta, &sptr, mdsize,
237  if (-1 == mdsize)
238  {
239  GNUNET_break (0);
240  GNUNET_free (ub_plain);
241  cont (cont_cls, _("Internal error."));
242  return NULL;
243  }
244  size = sizeof (struct UBlock) + slen + mdsize + ulen;
245 
247  "Publishing under identifier `%s'\n",
248  label);
249  /* get public key of the namespace */
251  &pub);
252  derive_ublock_encryption_key (&skey, &iv,
253  label, &pub);
254 
255  /* encrypt ublock */
256  ub_enc = GNUNET_malloc (size);
257  GNUNET_CRYPTO_symmetric_encrypt (&ub_plain[1],
258  ulen + slen + mdsize,
259  &skey, &iv,
260  &ub_enc[1]);
261  GNUNET_free (ub_plain);
262  ub_enc->purpose.size = htonl (ulen + slen + mdsize +
263  sizeof (struct UBlock)
264  - sizeof (struct GNUNET_CRYPTO_EcdsaSignature));
266 
267  /* derive signing-key from 'label' and public key of the namespace */
268  nsd = GNUNET_CRYPTO_ecdsa_private_key_derive (ns, label, "fs-ublock");
270  &ub_enc->verification_key);
273  &ub_enc->purpose,
274  &ub_enc->signature));
276  sizeof (ub_enc->verification_key),
277  &query);
278  GNUNET_free (nsd);
279 
281  uc->cont = cont;
282  uc->cont_cls = cont_cls;
283  if (NULL != dsh)
284  {
285  uc->qre =
287  0,
288  &query,
289  ulen + slen + mdsize + sizeof (struct UBlock),
290  ub_enc,
292  bo->content_priority,
293  bo->anonymity_level,
294  bo->replication_level,
295  bo->expiration_time,
296  -2, 1,
297  &ublock_put_cont, uc);
298  }
299  else
300  {
302  uc);
303  }
304  GNUNET_free (ub_enc);
305  return uc;
306 }
struct GNUNET_TIME_Absolute expiration_time
At what time should the block expire? Data blocks (DBLOCKS and IBLOCKS) may still be used even if the...
ssize_t GNUNET_CONTAINER_meta_data_get_serialized_size(const struct GNUNET_CONTAINER_MetaData *md)
Get the size of the full meta-data in serialized form.
GNUNET_FS_UBlockContinuation cont
Function to call when done.
ssize_t GNUNET_CONTAINER_meta_data_serialize(const struct GNUNET_CONTAINER_MetaData *md, char **target, size_t max, enum GNUNET_CONTAINER_MetaDataSerializationOptions opt)
Serialize meta-data to target.
If not enough space is available, it is acceptable to only serialize some of the metadata.
uint32_t purpose
What does this signature vouch for? This must contain a GNUNET_SIGNATURE_PURPOSE_XXX constant (from g...
struct GNUNET_DATASTORE_QueueEntry * GNUNET_DATASTORE_put(struct GNUNET_DATASTORE_Handle *h, uint32_t rid, const struct GNUNET_HashCode *key, size_t size, const void *data, enum GNUNET_BLOCK_Type type, uint32_t priority, uint32_t anonymity, uint32_t replication, struct GNUNET_TIME_Absolute expiration, unsigned int queue_priority, unsigned int max_queue_size, GNUNET_DATASTORE_ContinuationWithStatus cont, void *cont_cls)
Store an item in the datastore.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static struct GNUNET_FS_UnindexContext * uc
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:78
static void ublock_put_cont(void *cls, int32_t success, struct GNUNET_TIME_Absolute min_expiration, const char *msg)
Continuation of GNUNET_FS_publish_ublock_().
#define GNUNET_new(type)
Allocate a struct or union of the given type.
Private ECC key encoded for transmission.
struct GNUNET_DATASTORE_QueueEntry * qre
Handle for active datastore operation.
#define GNUNET_SIGNATURE_PURPOSE_FS_UBLOCK
UBlock Signature, done using DSS, not ECC.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
#define _(String)
GNU gettext support macro.
Definition: platform.h:208
char * GNUNET_FS_uri_to_string(const struct GNUNET_FS_Uri *uri)
Convert a URI to a UTF-8 String.
Definition: fs_uri.c:1988
uint32_t anonymity_level
At which anonymity level should the block be shared? (0: no anonymity, 1: normal GAP, >1: with cover traffic).
int GNUNET_CRYPTO_ecdsa_sign(const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv, const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose, struct GNUNET_CRYPTO_EcdsaSignature *sig)
ECDSA Sign a given block.
Definition: crypto_ecc.c:931
struct GNUNET_CRYPTO_EcdsaSignature signature
Signature using pseudonym and search keyword / identifier.
Definition: block_fs.h:56
#define GNUNET_memcpy(dst, src, n)
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
ssize_t GNUNET_CRYPTO_symmetric_encrypt(const void *block, size_t size, const struct GNUNET_CRYPTO_SymmetricSessionKey *sessionkey, const struct GNUNET_CRYPTO_SymmetricInitializationVector *iv, void *result)
Encrypt a block using a symmetric sessionkey.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1273
an ECC signature using ECDSA
uint32_t size
How many bytes does this signature sign? (including this purpose header); in network byte order (!)...
Type of a block representing any type of search result (universal).
A 512-bit hashcode.
static unsigned int size
Size of the "table".
Definition: peer.c:67
void GNUNET_CRYPTO_ecdsa_key_get_public(const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv, struct GNUNET_CRYPTO_EcdsaPublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:241
struct GNUNET_SCHEDULER_Task * task
Task to run continuation asynchronously.
uint32_t replication_level
How often should we try to migrate the block to other peers? Only used if "CONTENT_PUSHING" is set to...
Context for 'ublock_put_cont'.
static struct GNUNET_CRYPTO_EddsaPublicKey pub
Definition: gnunet-scrypt.c:39
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and ECDS...
#define GNUNET_log(kind,...)
uint32_t content_priority
How important is it for us to store the block? If we run out of space, the highest-priority, non-expired blocks will be kept.
static void run_cont(void *cls)
Run the continuation.
#define MAX_UBLOCK_SIZE
Maximum legal size for a ublock.
Definition: block_fs.h:41
struct GNUNET_CRYPTO_EcdsaPrivateKey * GNUNET_CRYPTO_ecdsa_private_key_derive(const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv, const char *label, const char *context)
Derive a private key from a given private key and a label.
Definition: crypto_ecc.c:1295
static void derive_ublock_encryption_key(struct GNUNET_CRYPTO_SymmetricSessionKey *skey, struct GNUNET_CRYPTO_SymmetricInitializationVector *iv, const char *label, const struct GNUNET_CRYPTO_EcdsaPublicKey *pub)
Derive the key for symmetric encryption/decryption from the public key and the label.
void * cont_cls
Closure of 'cont'.
struct GNUNET_CRYPTO_EccSignaturePurpose purpose
What is being signed and why?
Definition: block_fs.h:61
struct GNUNET_CRYPTO_EcdsaPublicKey verification_key
Public key used to sign this block.
Definition: block_fs.h:66
universal block for keyword and namespace search results
Definition: block_fs.h:50
#define GNUNET_malloc(size)
Wrapper around malloc.
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GNUNET_FS_publish_ublock_cancel_()

void GNUNET_FS_publish_ublock_cancel_ ( struct GNUNET_FS_PublishUblockContext uc)

Abort UBlock publishing operation.

Parameters
ucoperation to abort.

Definition at line 315 of file fs_publish_ublock.c.

References GNUNET_DATASTORE_cancel(), GNUNET_free, GNUNET_SCHEDULER_cancel(), GNUNET_FS_PublishUblockContext::qre, and GNUNET_FS_PublishUblockContext::task.

Referenced by GNUNET_FS_publish_ksk_cancel(), and GNUNET_FS_publish_sks_cancel().

316 {
317  if (NULL != uc->qre)
319  if (NULL != uc->task)
321  GNUNET_free (uc);
322 }
struct GNUNET_DATASTORE_QueueEntry * qre
Handle for active datastore operation.
struct GNUNET_SCHEDULER_Task * task
Task to run continuation asynchronously.
void GNUNET_DATASTORE_cancel(struct GNUNET_DATASTORE_QueueEntry *qe)
Cancel a datastore operation.
#define GNUNET_free(ptr)
Wrapper around free.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:965
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