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/*
This file is part of GNUnet.
Copyright (C) 2009, 2010, 2012, 2013 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file fs/fs_publish_ksk.c
* @brief publish a URI under a keyword in GNUnet
* @see https://gnunet.org/encoding and #2564
* @author Krista Bennett
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_constants.h"
#include "gnunet_signatures.h"
#include "gnunet_util_lib.h"
#include "gnunet_fs_service.h"
#include "fs_api.h"
#include "fs_tree.h"
#include "fs_publish_ublock.h"
/**
* Context for the KSK publication.
*/
struct GNUNET_FS_PublishKskContext
{
/**
* Keywords to use.
*/
struct GNUNET_FS_Uri *ksk_uri;
/**
* URI to publish.
*/
struct GNUNET_FS_Uri *uri;
/**
* Metadata to use.
*/
struct GNUNET_CONTAINER_MetaData *meta;
/**
* Global FS context.
*/
struct GNUNET_FS_Handle *h;
/**
* UBlock publishing operation that is active.
*/
struct GNUNET_FS_PublishUblockContext *uc;
/**
* Handle to the datastore, NULL if we are just simulating.
*/
struct GNUNET_DATASTORE_Handle *dsh;
/**
* Current task.
*/
struct GNUNET_SCHEDULER_Task * ksk_task;
/**
* Function to call once we're done.
*/
GNUNET_FS_PublishContinuation cont;
/**
* Closure for cont.
*/
void *cont_cls;
/**
* When should the KBlocks expire?
*/
struct GNUNET_FS_BlockOptions bo;
/**
* Options to use.
*/
enum GNUNET_FS_PublishOptions options;
/**
* Keyword that we are currently processing.
*/
unsigned int i;
};
/**
* Continuation of #GNUNET_FS_publish_ksk() that performs
* the actual publishing operation (iterating over all
* of the keywords).
*
* @param cls closure of type `struct PublishKskContext *`
*/
static void
publish_ksk_cont (void *cls);
/**
* Function called by the datastore API with
* the result from the PUT request.
*
* @param cls closure of type `struct GNUNET_FS_PublishKskContext *`
* @param msg error message (or NULL)
*/
static void
kb_put_cont (void *cls,
const char *msg)
{
struct GNUNET_FS_PublishKskContext *pkc = cls;
pkc->uc = NULL;
if (NULL != msg)
{
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"KBlock PUT operation failed: %s\n", msg);
pkc->cont (pkc->cont_cls, NULL, msg);
GNUNET_FS_publish_ksk_cancel (pkc);
return;
}
pkc->ksk_task = GNUNET_SCHEDULER_add_now (&publish_ksk_cont, pkc);
}
/**
* Continuation of #GNUNET_FS_publish_ksk() that performs the actual
* publishing operation (iterating over all of the keywords).
*
* @param cls closure of type `struct GNUNET_FS_PublishKskContext *`
*/
static void
publish_ksk_cont (void *cls)
{
struct GNUNET_FS_PublishKskContext *pkc = cls;
const char *keyword;
pkc->ksk_task = NULL;
if ( (pkc->i == pkc->ksk_uri->data.ksk.keywordCount) ||
(NULL == pkc->dsh) )
{
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"KSK PUT operation complete\n");
pkc->cont (pkc->cont_cls, pkc->ksk_uri,
NULL);
GNUNET_FS_publish_ksk_cancel (pkc);
return;
}
keyword = pkc->ksk_uri->data.ksk.keywords[pkc->i++];
pkc->uc = GNUNET_FS_publish_ublock_ (pkc->h,
pkc->dsh,
keyword + 1 /* skip '+' */,
NULL,
GNUNET_CRYPTO_ecdsa_key_get_anonymous (),
pkc->meta,
pkc->uri,
&pkc->bo,
pkc->options,
&kb_put_cont, pkc);
}
/**
* Publish a CHK under various keywords on GNUnet.
*
* @param h handle to the file sharing subsystem
* @param ksk_uri keywords to use
* @param meta metadata to use
* @param uri URI to refer to in the KBlock
* @param bo per-block options
* @param options publication options
* @param cont continuation
* @param cont_cls closure for cont
* @return NULL on error ('cont' will still be called)
*/
struct GNUNET_FS_PublishKskContext *
GNUNET_FS_publish_ksk (struct GNUNET_FS_Handle *h,
const struct GNUNET_FS_Uri *ksk_uri,
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_PublishContinuation cont, void *cont_cls)
{
struct GNUNET_FS_PublishKskContext *pkc;
GNUNET_assert (NULL != uri);
pkc = GNUNET_new (struct GNUNET_FS_PublishKskContext);
pkc->h = h;
pkc->bo = *bo;
pkc->options = options;
pkc->cont = cont;
pkc->cont_cls = cont_cls;
pkc->meta = GNUNET_CONTAINER_meta_data_duplicate (meta);
if (0 == (options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY))
{
pkc->dsh = GNUNET_DATASTORE_connect (h->cfg);
if (NULL == pkc->dsh)
{
cont (cont_cls,
NULL,
_("Could not connect to datastore."));
GNUNET_free (pkc);
return NULL;
}
}
pkc->uri = GNUNET_FS_uri_dup (uri);
pkc->ksk_uri = GNUNET_FS_uri_dup (ksk_uri);
pkc->ksk_task = GNUNET_SCHEDULER_add_now (&publish_ksk_cont, pkc);
return pkc;
}
/**
* Abort the KSK publishing operation.
*
* @param pkc context of the operation to abort.
*/
void
GNUNET_FS_publish_ksk_cancel (struct GNUNET_FS_PublishKskContext *pkc)
{
if (NULL != pkc->ksk_task)
{
GNUNET_SCHEDULER_cancel (pkc->ksk_task);
pkc->ksk_task = NULL;
}
if (NULL != pkc->uc)
{
GNUNET_FS_publish_ublock_cancel_ (pkc->uc);
pkc->uc = NULL;
}
if (NULL != pkc->dsh)
{
GNUNET_DATASTORE_disconnect (pkc->dsh, GNUNET_NO);
pkc->dsh = NULL;
}
GNUNET_CONTAINER_meta_data_destroy (pkc->meta);
GNUNET_FS_uri_destroy (pkc->ksk_uri);
GNUNET_FS_uri_destroy (pkc->uri);
GNUNET_free (pkc);
}
/* end of fs_publish_ksk.c */
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