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- /*
- This file is part of GNUnet.
- (C) 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009 Christian Grothoff (and other contributing authors)
- GNUnet is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3, 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
- General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
- */
- /**
- * @file fs/fs_search.c
- * @brief Helper functions for searching.
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet_constants.h"
- #include "gnunet_fs_service.h"
- #include "gnunet_protocols.h"
- #include "fs.h"
- #define DEBUG_SEARCH GNUNET_NO
- /**
- * Fill in all of the generic fields for a search event and
- * call the callback.
- *
- * @param pi structure to fill in
- * @param sc overall search context
- * @return value returned by the callback
- */
- void *
- GNUNET_FS_search_make_status_ (struct GNUNET_FS_ProgressInfo *pi,
- struct GNUNET_FS_SearchContext *sc)
- {
- void *ret;
- pi->value.search.sc = sc;
- pi->value.search.cctx = sc->client_info;
- pi->value.search.pctx =
- (sc->psearch_result == NULL) ? NULL : sc->psearch_result->client_info;
- pi->value.search.query = sc->uri;
- pi->value.search.duration =
- GNUNET_TIME_absolute_get_duration (sc->start_time);
- pi->value.search.anonymity = sc->anonymity;
- ret = sc->h->upcb (sc->h->upcb_cls, pi);
- return ret;
- }
- /**
- * Check if the given result is identical
- * to the given URI.
- *
- * @param cls points to the URI we check against
- * @param key not used
- * @param value a "struct GNUNET_FS_SearchResult" who's URI we
- * should compare with
- * @return GNUNET_SYSERR if the result is present,
- * GNUNET_OK otherwise
- */
- static int
- test_result_present (void *cls, const GNUNET_HashCode * key, void *value)
- {
- const struct GNUNET_FS_Uri *uri = cls;
- struct GNUNET_FS_SearchResult *sr = value;
- if (GNUNET_FS_uri_test_equal (uri, sr->uri))
- return GNUNET_SYSERR;
- return GNUNET_OK;
- }
- /**
- * We've found a new CHK result. Let the client
- * know about it.
- *
- * @param sc the search context
- * @param sr the specific result
- */
- static void
- notify_client_chk_result (struct GNUNET_FS_SearchContext *sc,
- struct GNUNET_FS_SearchResult *sr)
- {
- struct GNUNET_FS_ProgressInfo pi;
- pi.status = GNUNET_FS_STATUS_SEARCH_RESULT;
- pi.value.search.specifics.result.meta = sr->meta;
- pi.value.search.specifics.result.uri = sr->uri;
- pi.value.search.specifics.result.result = sr;
- pi.value.search.specifics.result.applicability_rank = sr->optional_support;
- sr->client_info = GNUNET_FS_search_make_status_ (&pi, sc);
- }
- /**
- * We've found new information about an existing CHK result. Let the
- * client know about it.
- *
- * @param sc the search context
- * @param sr the specific result
- */
- static void
- notify_client_chk_update (struct GNUNET_FS_SearchContext *sc,
- struct GNUNET_FS_SearchResult *sr)
- {
- struct GNUNET_FS_ProgressInfo pi;
- pi.status = GNUNET_FS_STATUS_SEARCH_UPDATE;
- pi.value.search.specifics.update.cctx = sr->client_info;
- pi.value.search.specifics.update.meta = sr->meta;
- pi.value.search.specifics.update.uri = sr->uri;
- pi.value.search.specifics.update.availability_rank =
- 2 * sr->availability_success - sr->availability_trials;
- pi.value.search.specifics.update.availability_certainty =
- sr->availability_trials;
- pi.value.search.specifics.update.applicability_rank = sr->optional_support;
- sr->client_info = GNUNET_FS_search_make_status_ (&pi, sc);
- }
- /**
- * Context for "get_result_present".
- */
- struct GetResultContext
- {
- /**
- * The URI we're looking for.
- */
- const struct GNUNET_FS_Uri *uri;
- /**
- * Where to store a pointer to the search
- * result struct if we found a match.
- */
- struct GNUNET_FS_SearchResult *sr;
- };
- /**
- * Check if the given result is identical to the given URI and if so
- * return it.
- *
- * @param cls a "struct GetResultContext"
- * @param key not used
- * @param value a "struct GNUNET_FS_SearchResult" who's URI we
- * should compare with
- * @return GNUNET_OK
- */
- static int
- get_result_present (void *cls, const GNUNET_HashCode * key, void *value)
- {
- struct GetResultContext *grc = cls;
- struct GNUNET_FS_SearchResult *sr = value;
- if (GNUNET_FS_uri_test_equal (grc->uri, sr->uri))
- grc->sr = sr;
- return GNUNET_OK;
- }
- /**
- * Signal result of last probe to client and then schedule next
- * probe.
- */
- static void
- signal_probe_result (struct GNUNET_FS_SearchResult *sr)
- {
- struct GNUNET_FS_ProgressInfo pi;
- pi.status = GNUNET_FS_STATUS_SEARCH_START;
- pi.value.search.specifics.update.cctx = sr->client_info;
- pi.value.search.specifics.update.meta = sr->meta;
- pi.value.search.specifics.update.uri = sr->uri;
- pi.value.search.specifics.update.availability_rank = sr->availability_success;
- pi.value.search.specifics.update.availability_certainty =
- sr->availability_trials;
- pi.value.search.specifics.update.applicability_rank = sr->optional_support;
- sr->sc->client_info = GNUNET_FS_search_make_status_ (&pi, sr->sc);
- GNUNET_FS_search_start_probe_ (sr);
- }
- /**
- * Handle the case where we have failed to receive a response for our probe.
- *
- * @param cls our 'struct GNUNET_FS_SearchResult*'
- * @param tc scheduler context
- */
- static void
- probe_failure_handler (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- struct GNUNET_FS_SearchResult *sr = cls;
- sr->availability_trials++;
- GNUNET_FS_search_result_sync_ (sr);
- signal_probe_result (sr);
- }
- /**
- * Handle the case where we have gotten a response for our probe.
- *
- * @param cls our 'struct GNUNET_FS_SearchResult*'
- * @param tc scheduler context
- */
- static void
- probe_success_handler (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- struct GNUNET_FS_SearchResult *sr = cls;
- sr->availability_trials++;
- sr->availability_success++;
- GNUNET_FS_search_result_sync_ (sr);
- signal_probe_result (sr);
- }
- /**
- * Notification of FS that a search probe has made progress.
- * This function is used INSTEAD of the client's event handler
- * for downloads where the GNUNET_FS_DOWNLOAD_IS_PROBE flag is set.
- *
- * @param cls closure, always NULL (!), actual closure
- * is in the client-context of the info struct
- * @param info details about the event, specifying the event type
- * and various bits about the event
- * @return client-context (for the next progress call
- * for this operation; should be set to NULL for
- * SUSPEND and STOPPED events). The value returned
- * will be passed to future callbacks in the respective
- * field in the GNUNET_FS_ProgressInfo struct.
- */
- void *
- GNUNET_FS_search_probe_progress_ (void *cls,
- const struct GNUNET_FS_ProgressInfo *info)
- {
- struct GNUNET_FS_SearchResult *sr = info->value.download.cctx;
- struct GNUNET_TIME_Relative dur;
- switch (info->status)
- {
- case GNUNET_FS_STATUS_DOWNLOAD_START:
- /* ignore */
- break;
- case GNUNET_FS_STATUS_DOWNLOAD_RESUME:
- /* probes should never be resumed */
- GNUNET_assert (0);
- break;
- case GNUNET_FS_STATUS_DOWNLOAD_SUSPEND:
- /* probes should never be suspended */
- GNUNET_break (0);
- break;
- case GNUNET_FS_STATUS_DOWNLOAD_PROGRESS:
- /* ignore */
- break;
- case GNUNET_FS_STATUS_DOWNLOAD_ERROR:
- if (sr->probe_cancel_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (sr->probe_cancel_task);
- sr->probe_cancel_task = GNUNET_SCHEDULER_NO_TASK;
- }
- sr->probe_cancel_task =
- GNUNET_SCHEDULER_add_delayed (sr->remaining_probe_time,
- &probe_failure_handler, sr);
- break;
- case GNUNET_FS_STATUS_DOWNLOAD_COMPLETED:
- if (sr->probe_cancel_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (sr->probe_cancel_task);
- sr->probe_cancel_task = GNUNET_SCHEDULER_NO_TASK;
- }
- sr->probe_cancel_task =
- GNUNET_SCHEDULER_add_delayed (sr->remaining_probe_time,
- &probe_success_handler, sr);
- break;
- case GNUNET_FS_STATUS_DOWNLOAD_STOPPED:
- if (sr->probe_cancel_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (sr->probe_cancel_task);
- sr->probe_cancel_task = GNUNET_SCHEDULER_NO_TASK;
- }
- sr = NULL;
- break;
- case GNUNET_FS_STATUS_DOWNLOAD_ACTIVE:
- GNUNET_assert (sr->probe_cancel_task == GNUNET_SCHEDULER_NO_TASK);
- sr->probe_active_time = GNUNET_TIME_absolute_get ();
- sr->probe_cancel_task =
- GNUNET_SCHEDULER_add_delayed (sr->remaining_probe_time,
- &probe_failure_handler, sr);
- break;
- case GNUNET_FS_STATUS_DOWNLOAD_INACTIVE:
- if (sr->probe_cancel_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (sr->probe_cancel_task);
- sr->probe_cancel_task = GNUNET_SCHEDULER_NO_TASK;
- }
- dur = GNUNET_TIME_absolute_get_duration (sr->probe_active_time);
- sr->remaining_probe_time =
- GNUNET_TIME_relative_subtract (sr->remaining_probe_time, dur);
- GNUNET_FS_search_result_sync_ (sr);
- break;
- default:
- GNUNET_break (0);
- return NULL;
- }
- return sr;
- }
- /**
- * Start download probes for the given search result.
- *
- * @param sr the search result
- */
- void
- GNUNET_FS_search_start_probe_ (struct GNUNET_FS_SearchResult *sr)
- {
- uint64_t off;
- uint64_t len;
- if (sr->probe_ctx != NULL)
- return;
- if (sr->download != NULL)
- return;
- if (0 == (sr->sc->h->flags & GNUNET_FS_FLAGS_DO_PROBES))
- return;
- if (sr->availability_trials > AVAILABILITY_TRIALS_MAX)
- return;
- len = GNUNET_FS_uri_chk_get_file_size (sr->uri);
- if (len == 0)
- return;
- if ((len <= DBLOCK_SIZE) && (sr->availability_success > 0))
- return;
- off = len / DBLOCK_SIZE;
- if (off > 0)
- off = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, off);
- off *= DBLOCK_SIZE;
- if (len - off < DBLOCK_SIZE)
- len = len - off;
- else
- len = DBLOCK_SIZE;
- sr->remaining_probe_time =
- GNUNET_TIME_relative_multiply (sr->sc->h->avg_block_latency,
- 2 * (1 + sr->availability_trials));
- sr->probe_ctx =
- GNUNET_FS_download_start (sr->sc->h, sr->uri, sr->meta, NULL, NULL, off,
- len, sr->sc->anonymity,
- GNUNET_FS_DOWNLOAD_NO_TEMPORARIES |
- GNUNET_FS_DOWNLOAD_IS_PROBE, sr, NULL);
- }
- /**
- * We have received a KSK result. Check how it fits in with the
- * overall query and notify the client accordingly.
- *
- * @param sc context for the overall query
- * @param ent entry for the specific keyword
- * @param uri the URI that was found
- * @param meta metadata associated with the URI
- * under the "ent" keyword
- */
- static void
- process_ksk_result (struct GNUNET_FS_SearchContext *sc,
- struct SearchRequestEntry *ent,
- const struct GNUNET_FS_Uri *uri,
- const struct GNUNET_CONTAINER_MetaData *meta)
- {
- GNUNET_HashCode key;
- struct GNUNET_FS_SearchResult *sr;
- struct GetResultContext grc;
- int is_new;
- /* check if new */
- GNUNET_FS_uri_to_key (uri, &key);
- if (GNUNET_SYSERR ==
- GNUNET_CONTAINER_multihashmap_get_multiple (ent->results, &key,
- &test_result_present,
- (void *) uri))
- return; /* duplicate result */
- /* try to find search result in master map */
- grc.sr = NULL;
- grc.uri = uri;
- GNUNET_CONTAINER_multihashmap_get_multiple (sc->master_result_map, &key,
- &get_result_present, &grc);
- sr = grc.sr;
- is_new = (NULL == sr) || (sr->mandatory_missing > 0);
- if (NULL == sr)
- {
- sr = GNUNET_malloc (sizeof (struct GNUNET_FS_SearchResult));
- sr->sc = sc;
- sr->uri = GNUNET_FS_uri_dup (uri);
- sr->meta = GNUNET_CONTAINER_meta_data_duplicate (meta);
- sr->mandatory_missing = sc->mandatory_count;
- sr->key = key;
- GNUNET_CONTAINER_multihashmap_put (sc->master_result_map, &key, sr,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
- }
- else
- {
- GNUNET_CONTAINER_meta_data_merge (sr->meta, meta);
- }
- /* check if mandatory satisfied */
- if (ent->mandatory)
- sr->mandatory_missing--;
- else
- sr->optional_support++;
- if (0 != sr->mandatory_missing)
- return;
- if (is_new)
- notify_client_chk_result (sc, sr);
- else
- notify_client_chk_update (sc, sr);
- GNUNET_FS_search_result_sync_ (sr);
- GNUNET_FS_search_start_probe_ (sr);
- }
- /**
- * Start search for content, internal API.
- *
- * @param h handle to the file sharing subsystem
- * @param uri specifies the search parameters; can be
- * a KSK URI or an SKS URI.
- * @param anonymity desired level of anonymity
- * @param options options for the search
- * @param cctx client context
- * @param psearch parent search result (for namespace update searches)
- * @return context that can be used to control the search
- */
- static struct GNUNET_FS_SearchContext *
- search_start (struct GNUNET_FS_Handle *h, const struct GNUNET_FS_Uri *uri,
- uint32_t anonymity, enum GNUNET_FS_SearchOptions options,
- void *cctx, struct GNUNET_FS_SearchResult *psearch);
- /**
- * We have received an SKS result. Start searching for updates and
- * notify the client if it is a new result.
- *
- * @param sc context for the overall query
- * @param id_update identifier for updates, NULL for none
- * @param uri the URI that was found
- * @param meta metadata associated with the URI
- */
- static void
- process_sks_result (struct GNUNET_FS_SearchContext *sc, const char *id_update,
- const struct GNUNET_FS_Uri *uri,
- const struct GNUNET_CONTAINER_MetaData *meta)
- {
- struct GNUNET_FS_Uri uu;
- GNUNET_HashCode key;
- struct GNUNET_FS_SearchResult *sr;
- /* check if new */
- GNUNET_FS_uri_to_key (uri, &key);
- GNUNET_CRYPTO_hash_xor (&uri->data.chk.chk.key, &uri->data.chk.chk.query,
- &key);
- if (GNUNET_SYSERR ==
- GNUNET_CONTAINER_multihashmap_get_multiple (sc->master_result_map, &key,
- &test_result_present,
- (void *) uri))
- return; /* duplicate result */
- sr = GNUNET_malloc (sizeof (struct GNUNET_FS_SearchResult));
- sr->sc = sc;
- sr->uri = GNUNET_FS_uri_dup (uri);
- sr->meta = GNUNET_CONTAINER_meta_data_duplicate (meta);
- sr->key = key;
- GNUNET_CONTAINER_multihashmap_put (sc->master_result_map, &key, sr,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
- GNUNET_FS_search_result_sync_ (sr);
- GNUNET_FS_search_start_probe_ (sr);
- /* notify client */
- notify_client_chk_result (sc, sr);
- /* search for updates */
- if (strlen (id_update) == 0)
- return; /* no updates */
- uu.type = sks;
- uu.data.sks.namespace = sc->uri->data.sks.namespace;
- uu.data.sks.identifier = GNUNET_strdup (id_update);
- (void) search_start (sc->h, &uu, sc->anonymity, sc->options, NULL, sr);
- GNUNET_free (uu.data.sks.identifier);
- }
- /**
- * Process a keyword-search result.
- *
- * @param sc our search context
- * @param kb the kblock
- * @param size size of kb
- */
- static void
- process_kblock (struct GNUNET_FS_SearchContext *sc, const struct KBlock *kb,
- size_t size)
- {
- unsigned int i;
- size_t j;
- GNUNET_HashCode q;
- char pt[size - sizeof (struct KBlock)];
- struct GNUNET_CRYPTO_AesSessionKey skey;
- struct GNUNET_CRYPTO_AesInitializationVector iv;
- const char *eos;
- struct GNUNET_CONTAINER_MetaData *meta;
- struct GNUNET_FS_Uri *uri;
- char *emsg;
- GNUNET_CRYPTO_hash (&kb->keyspace,
- sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
- &q);
- /* find key */
- for (i = 0; i < sc->uri->data.ksk.keywordCount; i++)
- if (0 == memcmp (&q, &sc->requests[i].query, sizeof (GNUNET_HashCode)))
- break;
- if (i == sc->uri->data.ksk.keywordCount)
- {
- /* oops, does not match any of our keywords!? */
- GNUNET_break (0);
- return;
- }
- /* decrypt */
- GNUNET_CRYPTO_hash_to_aes_key (&sc->requests[i].key, &skey, &iv);
- if (-1 ==
- GNUNET_CRYPTO_aes_decrypt (&kb[1], size - sizeof (struct KBlock), &skey,
- &iv, pt))
- {
- GNUNET_break (0);
- return;
- }
- /* parse */
- eos = memchr (pt, 0, sizeof (pt));
- if (NULL == eos)
- {
- GNUNET_break_op (0);
- return;
- }
- j = eos - pt + 1;
- if (sizeof (pt) == j)
- meta = GNUNET_CONTAINER_meta_data_create ();
- else
- meta = GNUNET_CONTAINER_meta_data_deserialize (&pt[j], sizeof (pt) - j);
- if (meta == NULL)
- {
- GNUNET_break_op (0); /* kblock malformed */
- return;
- }
- uri = GNUNET_FS_uri_parse (pt, &emsg);
- if (uri == NULL)
- {
- GNUNET_break_op (0); /* kblock malformed */
- GNUNET_free_non_null (emsg);
- GNUNET_CONTAINER_meta_data_destroy (meta);
- return;
- }
- /* process */
- process_ksk_result (sc, &sc->requests[i], uri, meta);
- /* clean up */
- GNUNET_CONTAINER_meta_data_destroy (meta);
- GNUNET_FS_uri_destroy (uri);
- }
- /**
- * Process a keyword-search result with a namespace advertisment.
- *
- * @param sc our search context
- * @param nb the nblock
- * @param size size of nb
- */
- static void
- process_nblock (struct GNUNET_FS_SearchContext *sc, const struct NBlock *nb,
- size_t size)
- {
- unsigned int i;
- size_t j;
- GNUNET_HashCode q;
- char pt[size - sizeof (struct NBlock)];
- struct GNUNET_CRYPTO_AesSessionKey skey;
- struct GNUNET_CRYPTO_AesInitializationVector iv;
- const char *eos;
- struct GNUNET_CONTAINER_MetaData *meta;
- struct GNUNET_FS_Uri *uri;
- char *uris;
- GNUNET_CRYPTO_hash (&nb->keyspace,
- sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
- &q);
- /* find key */
- for (i = 0; i < sc->uri->data.ksk.keywordCount; i++)
- if (0 == memcmp (&q, &sc->requests[i].query, sizeof (GNUNET_HashCode)))
- break;
- if (i == sc->uri->data.ksk.keywordCount)
- {
- /* oops, does not match any of our keywords!? */
- GNUNET_break (0);
- return;
- }
- /* decrypt */
- GNUNET_CRYPTO_hash_to_aes_key (&sc->requests[i].key, &skey, &iv);
- if (-1 ==
- GNUNET_CRYPTO_aes_decrypt (&nb[1], size - sizeof (struct NBlock), &skey,
- &iv, pt))
- {
- GNUNET_break (0);
- return;
- }
- /* parse */
- eos = memchr (pt, 0, sizeof (pt));
- if (NULL == eos)
- {
- GNUNET_break_op (0);
- return;
- }
- j = eos - pt + 1;
- if (sizeof (pt) == j)
- meta = GNUNET_CONTAINER_meta_data_create ();
- else
- meta = GNUNET_CONTAINER_meta_data_deserialize (&pt[j], sizeof (pt) - j);
- if (meta == NULL)
- {
- GNUNET_break_op (0); /* nblock malformed */
- return;
- }
- uri = GNUNET_malloc (sizeof (struct GNUNET_FS_Uri));
- uri->type = sks;
- uri->data.sks.identifier = GNUNET_strdup (pt);
- GNUNET_CRYPTO_hash (&nb->subspace,
- sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
- &uri->data.sks.namespace);
- uris = GNUNET_FS_uri_to_string (uri);
- GNUNET_CONTAINER_meta_data_insert (meta, "<gnunet>", EXTRACTOR_METATYPE_URI,
- EXTRACTOR_METAFORMAT_UTF8, "text/plain",
- uris, strlen (uris) + 1);
- GNUNET_free (uris);
- GNUNET_PSEUDONYM_add (sc->h->cfg, &uri->data.sks.namespace, meta);
- /* process */
- process_ksk_result (sc, &sc->requests[i], uri, meta);
- /* clean up */
- GNUNET_CONTAINER_meta_data_destroy (meta);
- GNUNET_FS_uri_destroy (uri);
- }
- /**
- * Process a namespace-search result.
- *
- * @param sc our search context
- * @param sb the sblock
- * @param size size of sb
- */
- static void
- process_sblock (struct GNUNET_FS_SearchContext *sc, const struct SBlock *sb,
- size_t size)
- {
- size_t len = size - sizeof (struct SBlock);
- char pt[len];
- struct GNUNET_CRYPTO_AesSessionKey skey;
- struct GNUNET_CRYPTO_AesInitializationVector iv;
- struct GNUNET_FS_Uri *uri;
- struct GNUNET_CONTAINER_MetaData *meta;
- const char *id;
- const char *uris;
- size_t off;
- char *emsg;
- GNUNET_HashCode key;
- char *identifier;
- /* decrypt */
- identifier = sc->uri->data.sks.identifier;
- GNUNET_CRYPTO_hash (identifier, strlen (identifier), &key);
- GNUNET_CRYPTO_hash_to_aes_key (&key, &skey, &iv);
- if (-1 == GNUNET_CRYPTO_aes_decrypt (&sb[1], len, &skey, &iv, pt))
- {
- GNUNET_break (0);
- return;
- }
- /* parse */
- off = GNUNET_STRINGS_buffer_tokenize (pt, len, 2, &id, &uris);
- if (off == 0)
- {
- GNUNET_break_op (0); /* sblock malformed */
- return;
- }
- meta = GNUNET_CONTAINER_meta_data_deserialize (&pt[off], len - off);
- if (meta == NULL)
- {
- GNUNET_break_op (0); /* sblock malformed */
- return;
- }
- uri = GNUNET_FS_uri_parse (uris, &emsg);
- if (uri == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Failed to parse URI `%s': %s\n", uris,
- emsg);
- GNUNET_break_op (0); /* sblock malformed */
- GNUNET_free_non_null (emsg);
- GNUNET_CONTAINER_meta_data_destroy (meta);
- return;
- }
- /* process */
- process_sks_result (sc, id, uri, meta);
- /* clean up */
- GNUNET_FS_uri_destroy (uri);
- GNUNET_CONTAINER_meta_data_destroy (meta);
- }
- /**
- * Process a search result.
- *
- * @param sc our search context
- * @param type type of the result
- * @param expiration when it will expire
- * @param data the (encrypted) response
- * @param size size of data
- */
- static void
- process_result (struct GNUNET_FS_SearchContext *sc, enum GNUNET_BLOCK_Type type,
- struct GNUNET_TIME_Absolute expiration, const void *data,
- size_t size)
- {
- if (GNUNET_TIME_absolute_get_duration (expiration).rel_value > 0)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Result received has already expired.\n");
- return; /* result expired */
- }
- switch (type)
- {
- case GNUNET_BLOCK_TYPE_FS_KBLOCK:
- if (!GNUNET_FS_uri_test_ksk (sc->uri))
- {
- GNUNET_break (0);
- return;
- }
- if (sizeof (struct KBlock) > size)
- {
- GNUNET_break_op (0);
- return;
- }
- process_kblock (sc, data, size);
- break;
- case GNUNET_BLOCK_TYPE_FS_SBLOCK:
- if (!GNUNET_FS_uri_test_sks (sc->uri))
- {
- GNUNET_break (0);
- return;
- }
- if (sizeof (struct SBlock) > size)
- {
- GNUNET_break_op (0);
- return;
- }
- process_sblock (sc, data, size);
- break;
- case GNUNET_BLOCK_TYPE_FS_NBLOCK:
- if (!GNUNET_FS_uri_test_ksk (sc->uri))
- {
- GNUNET_break (0);
- return;
- }
- if (sizeof (struct NBlock) > size)
- {
- GNUNET_break_op (0);
- return;
- }
- process_nblock (sc, data, size);
- break;
- case GNUNET_BLOCK_TYPE_ANY:
- GNUNET_break (0);
- break;
- case GNUNET_BLOCK_TYPE_FS_DBLOCK:
- GNUNET_break (0);
- break;
- case GNUNET_BLOCK_TYPE_FS_ONDEMAND:
- GNUNET_break (0);
- break;
- case GNUNET_BLOCK_TYPE_FS_IBLOCK:
- GNUNET_break (0);
- break;
- default:
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Got result with unknown block type `%d', ignoring"), type);
- break;
- }
- }
- /**
- * Shutdown any existing connection to the FS
- * service and try to establish a fresh one
- * (and then re-transmit our search request).
- *
- * @param sc the search to reconnec
- */
- static void
- try_reconnect (struct GNUNET_FS_SearchContext *sc);
- /**
- * Type of a function to call when we receive a message
- * from the service.
- *
- * @param cls closure
- * @param msg message received, NULL on timeout or fatal error
- */
- static void
- receive_results (void *cls, const struct GNUNET_MessageHeader *msg)
- {
- struct GNUNET_FS_SearchContext *sc = cls;
- const struct PutMessage *cm;
- uint16_t msize;
- if ((NULL == msg) || (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_FS_PUT) ||
- (ntohs (msg->size) <= sizeof (struct PutMessage)))
- {
- try_reconnect (sc);
- return;
- }
- msize = ntohs (msg->size);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Receiving %u bytes of result from fs service\n", msize);
- cm = (const struct PutMessage *) msg;
- process_result (sc, ntohl (cm->type),
- GNUNET_TIME_absolute_ntoh (cm->expiration), &cm[1],
- msize - sizeof (struct PutMessage));
- /* continue receiving */
- GNUNET_CLIENT_receive (sc->client, &receive_results, sc,
- GNUNET_TIME_UNIT_FOREVER_REL);
- }
- /**
- * Schedule the transmission of the (next) search request
- * to the service.
- *
- * @param sc context for the search
- */
- static void
- schedule_transmit_search_request (struct GNUNET_FS_SearchContext *sc);
- /**
- * Closure for 'build_result_set'.
- */
- struct MessageBuilderContext
- {
- /**
- * How many entries can we store to xoff.
- */
- unsigned int put_cnt;
- /**
- * How many entries should we skip.
- */
- unsigned int skip_cnt;
- /**
- * Where to store the keys.
- */
- GNUNET_HashCode *xoff;
- /**
- * Search context we are iterating for.
- */
- struct GNUNET_FS_SearchContext *sc;
- /**
- * URI the search result must match, NULL for any
- */
- struct GNUNET_FS_Uri *uri;
- };
- /**
- * Iterating over the known results, pick those
- * matching the given result range and store
- * their keys at 'xoff'.
- *
- * @param cls the 'struct MessageBuilderContext'
- * @param key key for a result
- * @param value the search result
- * @return GNUNET_OK to continue iterating
- */
- static int
- build_result_set (void *cls, const GNUNET_HashCode * key, void *value)
- {
- struct MessageBuilderContext *mbc = cls;
- struct GNUNET_FS_SearchResult *sr = value;
- if ((mbc->uri != NULL) &&
- (GNUNET_YES != GNUNET_FS_uri_test_equal (mbc->uri, sr->uri)))
- return GNUNET_OK;
- if (mbc->skip_cnt > 0)
- {
- mbc->skip_cnt--;
- return GNUNET_OK;
- }
- if (mbc->put_cnt == 0)
- return GNUNET_SYSERR;
- mbc->sc->search_request_map_offset++;
- mbc->xoff[--mbc->put_cnt] = *key;
- return GNUNET_OK;
- }
- /**
- * Iterating over the known results, count those
- * matching the given result range and increment
- * put count for each.
- *
- * @param cls the 'struct MessageBuilderContext'
- * @param key key for a result
- * @param value the search result
- * @return GNUNET_OK to continue iterating
- */
- static int
- find_result_set (void *cls, const GNUNET_HashCode * key, void *value)
- {
- struct MessageBuilderContext *mbc = cls;
- struct GNUNET_FS_SearchResult *sr = value;
- if ((mbc->uri != NULL) &&
- (GNUNET_YES != GNUNET_FS_uri_test_equal (mbc->uri, sr->uri)))
- return GNUNET_OK;
- mbc->put_cnt++;
- return GNUNET_OK;
- }
- /**
- * We're ready to transmit the search request to the
- * file-sharing service. Do it.
- *
- * @param cls closure
- * @param size number of bytes available in buf
- * @param buf where the callee should write the message
- * @return number of bytes written to buf
- */
- static size_t
- transmit_search_request (void *cls, size_t size, void *buf)
- {
- struct GNUNET_FS_SearchContext *sc = cls;
- struct MessageBuilderContext mbc;
- size_t msize;
- struct SearchMessage *sm;
- const char *identifier;
- GNUNET_HashCode key;
- GNUNET_HashCode idh;
- unsigned int sqms;
- if (NULL == buf)
- {
- try_reconnect (sc);
- return 0;
- }
- mbc.sc = sc;
- mbc.skip_cnt = sc->search_request_map_offset;
- sm = buf;
- sm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_START_SEARCH);
- mbc.xoff = (GNUNET_HashCode *) & sm[1];
- if (GNUNET_FS_uri_test_ksk (sc->uri))
- {
- msize = sizeof (struct SearchMessage);
- GNUNET_assert (size >= msize);
- mbc.uri = NULL;
- mbc.put_cnt = 0;
- GNUNET_CONTAINER_multihashmap_iterate (sc->master_result_map,
- &find_result_set, &mbc);
- sqms = mbc.put_cnt;
- mbc.put_cnt = (size - msize) / sizeof (GNUNET_HashCode);
- mbc.put_cnt = GNUNET_MIN (mbc.put_cnt, sqms - mbc.skip_cnt);
- if (sc->search_request_map_offset < sqms)
- GNUNET_assert (mbc.put_cnt > 0);
- sm->header.size = htons (msize);
- if (0 != (sc->options & GNUNET_FS_SEARCH_OPTION_LOOPBACK_ONLY))
- sm->options = htonl (1);
- else
- sm->options = htonl (0);
- sm->type = htonl (GNUNET_BLOCK_TYPE_ANY);
- sm->anonymity_level = htonl (sc->anonymity);
- memset (&sm->target, 0, sizeof (GNUNET_HashCode));
- sm->query = sc->requests[sc->keyword_offset].query;
- msize += sizeof (GNUNET_HashCode) * mbc.put_cnt;
- GNUNET_CONTAINER_multihashmap_iterate (sc->master_result_map,
- &build_result_set, &mbc);
- sm->header.size = htons (msize);
- if (sqms != sc->search_request_map_offset)
- {
- /* more requesting to be done... */
- schedule_transmit_search_request (sc);
- return msize;
- }
- sc->keyword_offset++;
- if (sc->uri->data.ksk.keywordCount != sc->keyword_offset)
- {
- /* more requesting to be done... */
- schedule_transmit_search_request (sc);
- return msize;
- }
- }
- else
- {
- GNUNET_assert (GNUNET_FS_uri_test_sks (sc->uri));
- msize = sizeof (struct SearchMessage);
- GNUNET_assert (size >= msize);
- if (0 != (sc->options & GNUNET_FS_SEARCH_OPTION_LOOPBACK_ONLY))
- sm->options = htonl (1);
- else
- sm->options = htonl (0);
- sm->type = htonl (GNUNET_BLOCK_TYPE_FS_SBLOCK);
- sm->anonymity_level = htonl (sc->anonymity);
- sm->target = sc->uri->data.sks.namespace;
- identifier = sc->uri->data.sks.identifier;
- GNUNET_CRYPTO_hash (identifier, strlen (identifier), &key);
- GNUNET_CRYPTO_hash (&key, sizeof (GNUNET_HashCode), &idh);
- GNUNET_CRYPTO_hash_xor (&idh, &sm->target, &sm->query);
- mbc.put_cnt = (size - msize) / sizeof (GNUNET_HashCode);
- sqms = GNUNET_CONTAINER_multihashmap_size (sc->master_result_map);
- mbc.put_cnt = GNUNET_MIN (mbc.put_cnt, sqms - mbc.skip_cnt);
- mbc.uri = NULL;
- if (sc->search_request_map_offset < sqms)
- GNUNET_assert (mbc.put_cnt > 0);
- msize += sizeof (GNUNET_HashCode) * mbc.put_cnt;
- GNUNET_CONTAINER_multihashmap_iterate (sc->master_result_map,
- &build_result_set, &mbc);
- sm->header.size = htons (msize);
- if (sqms != sc->search_request_map_offset)
- {
- /* more requesting to be done... */
- schedule_transmit_search_request (sc);
- return msize;
- }
- }
- GNUNET_CLIENT_receive (sc->client, &receive_results, sc,
- GNUNET_TIME_UNIT_FOREVER_REL);
- return msize;
- }
- /**
- * Schedule the transmission of the (next) search request
- * to the service.
- *
- * @param sc context for the search
- */
- static void
- schedule_transmit_search_request (struct GNUNET_FS_SearchContext *sc)
- {
- size_t size;
- unsigned int sqms;
- unsigned int fit;
- size = sizeof (struct SearchMessage);
- sqms =
- GNUNET_CONTAINER_multihashmap_size (sc->master_result_map) -
- sc->search_request_map_offset;
- fit = (GNUNET_SERVER_MAX_MESSAGE_SIZE - 1 - size) / sizeof (GNUNET_HashCode);
- fit = GNUNET_MIN (fit, sqms);
- size += sizeof (GNUNET_HashCode) * fit;
- GNUNET_CLIENT_notify_transmit_ready (sc->client, size,
- GNUNET_CONSTANTS_SERVICE_TIMEOUT,
- GNUNET_NO, &transmit_search_request, sc);
- }
- /**
- * Reconnect to the FS service and transmit
- * our queries NOW.
- *
- * @param cls our search context
- * @param tc unused
- */
- static void
- do_reconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- struct GNUNET_FS_SearchContext *sc = cls;
- struct GNUNET_CLIENT_Connection *client;
- sc->task = GNUNET_SCHEDULER_NO_TASK;
- client = GNUNET_CLIENT_connect ("fs", sc->h->cfg);
- if (NULL == client)
- {
- try_reconnect (sc);
- return;
- }
- sc->client = client;
- sc->search_request_map_offset = 0;
- sc->keyword_offset = 0;
- schedule_transmit_search_request (sc);
- }
- /**
- * Shutdown any existing connection to the FS
- * service and try to establish a fresh one
- * (and then re-transmit our search request).
- *
- * @param sc the search to reconnec
- */
- static void
- try_reconnect (struct GNUNET_FS_SearchContext *sc)
- {
- if (NULL != sc->client)
- {
- GNUNET_CLIENT_disconnect (sc->client, GNUNET_NO);
- sc->client = NULL;
- }
- sc->task =
- GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, &do_reconnect,
- sc);
- }
- /**
- * Start search for content, internal API.
- *
- * @param h handle to the file sharing subsystem
- * @param uri specifies the search parameters; can be
- * a KSK URI or an SKS URI.
- * @param anonymity desired level of anonymity
- * @param options options for the search
- * @param cctx initial value for the client context
- * @param psearch parent search result (for namespace update searches)
- * @return context that can be used to control the search
- */
- static struct GNUNET_FS_SearchContext *
- search_start (struct GNUNET_FS_Handle *h, const struct GNUNET_FS_Uri *uri,
- uint32_t anonymity, enum GNUNET_FS_SearchOptions options,
- void *cctx, struct GNUNET_FS_SearchResult *psearch)
- {
- struct GNUNET_FS_SearchContext *sc;
- struct GNUNET_FS_ProgressInfo pi;
- sc = GNUNET_malloc (sizeof (struct GNUNET_FS_SearchContext));
- sc->h = h;
- sc->options = options;
- sc->uri = GNUNET_FS_uri_dup (uri);
- sc->anonymity = anonymity;
- sc->start_time = GNUNET_TIME_absolute_get ();
- if (psearch != NULL)
- {
- sc->psearch_result = psearch;
- psearch->update_search = sc;
- }
- sc->master_result_map = GNUNET_CONTAINER_multihashmap_create (16);
- sc->client_info = cctx;
- if (GNUNET_OK != GNUNET_FS_search_start_searching_ (sc))
- {
- GNUNET_FS_uri_destroy (sc->uri);
- GNUNET_CONTAINER_multihashmap_destroy (sc->master_result_map);
- GNUNET_free (sc);
- return NULL;
- }
- GNUNET_FS_search_sync_ (sc);
- pi.status = GNUNET_FS_STATUS_SEARCH_START;
- sc->client_info = GNUNET_FS_search_make_status_ (&pi, sc);
- return sc;
- }
- /**
- * Build the request and actually initiate the search using the
- * GNUnet FS service.
- *
- * @param sc search context
- * @return GNUNET_OK on success, GNUNET_SYSERR on error
- */
- int
- GNUNET_FS_search_start_searching_ (struct GNUNET_FS_SearchContext *sc)
- {
- unsigned int i;
- const char *keyword;
- GNUNET_HashCode hc;
- struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pub;
- struct GNUNET_CRYPTO_RsaPrivateKey *pk;
- GNUNET_assert (NULL == sc->client);
- if (GNUNET_FS_uri_test_ksk (sc->uri))
- {
- GNUNET_assert (0 != sc->uri->data.ksk.keywordCount);
- sc->requests =
- GNUNET_malloc (sizeof (struct SearchRequestEntry) *
- sc->uri->data.ksk.keywordCount);
- for (i = 0; i < sc->uri->data.ksk.keywordCount; i++)
- {
- keyword = &sc->uri->data.ksk.keywords[i][1];
- GNUNET_CRYPTO_hash (keyword, strlen (keyword), &hc);
- pk = GNUNET_CRYPTO_rsa_key_create_from_hash (&hc);
- GNUNET_assert (pk != NULL);
- GNUNET_CRYPTO_rsa_key_get_public (pk, &pub);
- GNUNET_CRYPTO_rsa_key_free (pk);
- GNUNET_CRYPTO_hash (&pub,
- sizeof (struct
- GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
- &sc->requests[i].query);
- sc->requests[i].mandatory = (sc->uri->data.ksk.keywords[i][0] == '+');
- if (sc->requests[i].mandatory)
- sc->mandatory_count++;
- sc->requests[i].results = GNUNET_CONTAINER_multihashmap_create (4);
- GNUNET_CRYPTO_hash (keyword, strlen (keyword), &sc->requests[i].key);
- }
- }
- sc->client = GNUNET_CLIENT_connect ("fs", sc->h->cfg);
- if (NULL == sc->client)
- return GNUNET_SYSERR;
- schedule_transmit_search_request (sc);
- return GNUNET_OK;
- }
- /**
- * Freeze probes for the given search result.
- *
- * @param cls the global FS handle
- * @param key the key for the search result (unused)
- * @param value the search result to free
- * @return GNUNET_OK
- */
- static int
- search_result_freeze_probes (void *cls, const GNUNET_HashCode * key,
- void *value)
- {
- struct GNUNET_FS_SearchResult *sr = value;
- if (sr->probe_ctx != NULL)
- {
- GNUNET_FS_download_stop (sr->probe_ctx, GNUNET_YES);
- sr->probe_ctx = NULL;
- }
- if (sr->probe_cancel_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (sr->probe_cancel_task);
- sr->probe_cancel_task = GNUNET_SCHEDULER_NO_TASK;
- }
- if (sr->update_search != NULL)
- GNUNET_FS_search_pause (sr->update_search);
- return GNUNET_OK;
- }
- /**
- * Resume probes for the given search result.
- *
- * @param cls the global FS handle
- * @param key the key for the search result (unused)
- * @param value the search result to free
- * @return GNUNET_OK
- */
- static int
- search_result_resume_probes (void *cls, const GNUNET_HashCode * key,
- void *value)
- {
- struct GNUNET_FS_SearchResult *sr = value;
- GNUNET_FS_search_start_probe_ (sr);
- if (sr->update_search != NULL)
- GNUNET_FS_search_continue (sr->update_search);
- return GNUNET_OK;
- }
- /**
- * Signal suspend and free the given search result.
- *
- * @param cls the global FS handle
- * @param key the key for the search result (unused)
- * @param value the search result to free
- * @return GNUNET_OK
- */
- static int
- search_result_suspend (void *cls, const GNUNET_HashCode * key, void *value)
- {
- struct GNUNET_FS_SearchContext *sc = cls;
- struct GNUNET_FS_SearchResult *sr = value;
- struct GNUNET_FS_ProgressInfo pi;
- if (sr->download != NULL)
- GNUNET_FS_download_signal_suspend_ (sr->download);
- if (sr->update_search != NULL)
- GNUNET_FS_search_signal_suspend_ (sr->update_search);
- pi.status = GNUNET_FS_STATUS_SEARCH_RESULT_SUSPEND;
- pi.value.search.specifics.result_suspend.cctx = sr->client_info;
- pi.value.search.specifics.result_suspend.meta = sr->meta;
- pi.value.search.specifics.result_suspend.uri = sr->uri;
- sr->client_info = GNUNET_FS_search_make_status_ (&pi, sc);
- GNUNET_break (NULL == sr->client_info);
- GNUNET_free_non_null (sr->serialization);
- GNUNET_FS_uri_destroy (sr->uri);
- GNUNET_CONTAINER_meta_data_destroy (sr->meta);
- if (sr->probe_ctx != NULL)
- GNUNET_FS_download_stop (sr->probe_ctx, GNUNET_YES);
- if (sr->probe_cancel_task != GNUNET_SCHEDULER_NO_TASK)
- GNUNET_SCHEDULER_cancel (sr->probe_cancel_task);
- GNUNET_free (sr);
- return GNUNET_OK;
- }
- /**
- * Create SUSPEND event for the given search operation
- * and then clean up our state (without stop signal).
- *
- * @param cls the 'struct GNUNET_FS_SearchContext' to signal for
- */
- void
- GNUNET_FS_search_signal_suspend_ (void *cls)
- {
- struct GNUNET_FS_SearchContext *sc = cls;
- struct GNUNET_FS_ProgressInfo pi;
- unsigned int i;
- GNUNET_FS_end_top (sc->h, sc->top);
- GNUNET_CONTAINER_multihashmap_iterate (sc->master_result_map,
- &search_result_suspend, sc);
- pi.status = GNUNET_FS_STATUS_SEARCH_SUSPEND;
- sc->client_info = GNUNET_FS_search_make_status_ (&pi, sc);
- GNUNET_break (NULL == sc->client_info);
- if (sc->task != GNUNET_SCHEDULER_NO_TASK)
- GNUNET_SCHEDULER_cancel (sc->task);
- if (NULL != sc->client)
- GNUNET_CLIENT_disconnect (sc->client, GNUNET_NO);
- GNUNET_CONTAINER_multihashmap_destroy (sc->master_result_map);
- if (sc->requests != NULL)
- {
- GNUNET_assert (GNUNET_FS_uri_test_ksk (sc->uri));
- for (i = 0; i < sc->uri->data.ksk.keywordCount; i++)
- GNUNET_CONTAINER_multihashmap_destroy (sc->requests[i].results);
- }
- GNUNET_free_non_null (sc->requests);
- GNUNET_free_non_null (sc->emsg);
- GNUNET_FS_uri_destroy (sc->uri);
- GNUNET_free_non_null (sc->serialization);
- GNUNET_free (sc);
- }
- /**
- * Start search for content.
- *
- * @param h handle to the file sharing subsystem
- * @param uri specifies the search parameters; can be
- * a KSK URI or an SKS URI.
- * @param anonymity desired level of anonymity
- * @param options options for the search
- * @param cctx initial value for the client context
- * @return context that can be used to control the search
- */
- struct GNUNET_FS_SearchContext *
- GNUNET_FS_search_start (struct GNUNET_FS_Handle *h,
- const struct GNUNET_FS_Uri *uri, uint32_t anonymity,
- enum GNUNET_FS_SearchOptions options, void *cctx)
- {
- struct GNUNET_FS_SearchContext *ret;
- ret = search_start (h, uri, anonymity, options, cctx, NULL);
- if (ret == NULL)
- return NULL;
- ret->top = GNUNET_FS_make_top (h, &GNUNET_FS_search_signal_suspend_, ret);
- return ret;
- }
- /**
- * Pause search.
- *
- * @param sc context for the search that should be paused
- */
- void
- GNUNET_FS_search_pause (struct GNUNET_FS_SearchContext *sc)
- {
- struct GNUNET_FS_ProgressInfo pi;
- if (sc->task != GNUNET_SCHEDULER_NO_TASK)
- GNUNET_SCHEDULER_cancel (sc->task);
- sc->task = GNUNET_SCHEDULER_NO_TASK;
- if (NULL != sc->client)
- GNUNET_CLIENT_disconnect (sc->client, GNUNET_NO);
- sc->client = NULL;
- GNUNET_FS_search_sync_ (sc);
- GNUNET_CONTAINER_multihashmap_iterate (sc->master_result_map,
- &search_result_freeze_probes, sc);
- pi.status = GNUNET_FS_STATUS_SEARCH_PAUSED;
- sc->client_info = GNUNET_FS_search_make_status_ (&pi, sc);
- }
- /**
- * Continue paused search.
- *
- * @param sc context for the search that should be resumed
- */
- void
- GNUNET_FS_search_continue (struct GNUNET_FS_SearchContext *sc)
- {
- struct GNUNET_FS_ProgressInfo pi;
- GNUNET_assert (sc->client == NULL);
- GNUNET_assert (sc->task == GNUNET_SCHEDULER_NO_TASK);
- do_reconnect (sc, NULL);
- GNUNET_FS_search_sync_ (sc);
- pi.status = GNUNET_FS_STATUS_SEARCH_CONTINUED;
- sc->client_info = GNUNET_FS_search_make_status_ (&pi, sc);
- GNUNET_CONTAINER_multihashmap_iterate (sc->master_result_map,
- &search_result_resume_probes, sc);
- }
- /**
- * Free the given search result.
- *
- * @param cls the global FS handle
- * @param key the key for the search result (unused)
- * @param value the search result to free
- * @return GNUNET_OK
- */
- static int
- search_result_free (void *cls, const GNUNET_HashCode * key, void *value)
- {
- struct GNUNET_FS_SearchContext *sc = cls;
- struct GNUNET_FS_SearchResult *sr = value;
- struct GNUNET_FS_ProgressInfo pi;
- if (NULL != sr->download)
- {
- sr->download->search = NULL;
- sr->download->top =
- GNUNET_FS_make_top (sr->download->h,
- &GNUNET_FS_download_signal_suspend_, sr->download);
- if (NULL != sr->download->serialization)
- {
- GNUNET_FS_remove_sync_file_ (sc->h, GNUNET_FS_SYNC_PATH_CHILD_DOWNLOAD,
- sr->download->serialization);
- GNUNET_free (sr->download->serialization);
- sr->download->serialization = NULL;
- }
- pi.status = GNUNET_FS_STATUS_DOWNLOAD_LOST_PARENT;
- GNUNET_FS_download_make_status_ (&pi, sr->download);
- GNUNET_FS_download_sync_ (sr->download);
- sr->download = NULL;
- }
- if (NULL != sr->update_search)
- {
- GNUNET_FS_search_stop (sr->update_search);
- GNUNET_assert (sr->update_search == NULL);
- }
- pi.status = GNUNET_FS_STATUS_SEARCH_RESULT_STOPPED;
- pi.value.search.specifics.result_stopped.cctx = sr->client_info;
- pi.value.search.specifics.result_stopped.meta = sr->meta;
- pi.value.search.specifics.result_stopped.uri = sr->uri;
- sr->client_info = GNUNET_FS_search_make_status_ (&pi, sc);
- GNUNET_break (NULL == sr->client_info);
- GNUNET_free_non_null (sr->serialization);
- GNUNET_FS_uri_destroy (sr->uri);
- GNUNET_CONTAINER_meta_data_destroy (sr->meta);
- if (sr->probe_ctx != NULL)
- GNUNET_FS_download_stop (sr->probe_ctx, GNUNET_YES);
- if (sr->probe_cancel_task != GNUNET_SCHEDULER_NO_TASK)
- GNUNET_SCHEDULER_cancel (sr->probe_cancel_task);
- GNUNET_free (sr);
- return GNUNET_OK;
- }
- /**
- * Stop search for content.
- *
- * @param sc context for the search that should be stopped
- */
- void
- GNUNET_FS_search_stop (struct GNUNET_FS_SearchContext *sc)
- {
- struct GNUNET_FS_ProgressInfo pi;
- unsigned int i;
- if (sc->top != NULL)
- GNUNET_FS_end_top (sc->h, sc->top);
- if (sc->psearch_result != NULL)
- sc->psearch_result->update_search = NULL;
- GNUNET_CONTAINER_multihashmap_iterate (sc->master_result_map,
- &search_result_free, sc);
- if (sc->serialization != NULL)
- {
- GNUNET_FS_remove_sync_file_ (sc->h,
- (sc->psearch_result !=
- NULL) ? GNUNET_FS_SYNC_PATH_CHILD_SEARCH :
- GNUNET_FS_SYNC_PATH_MASTER_SEARCH,
- sc->serialization);
- GNUNET_FS_remove_sync_dir_ (sc->h,
- (sc->psearch_result !=
- NULL) ? GNUNET_FS_SYNC_PATH_CHILD_SEARCH :
- GNUNET_FS_SYNC_PATH_MASTER_SEARCH,
- sc->serialization);
- GNUNET_free (sc->serialization);
- }
- pi.status = GNUNET_FS_STATUS_SEARCH_STOPPED;
- sc->client_info = GNUNET_FS_search_make_status_ (&pi, sc);
- GNUNET_break (NULL == sc->client_info);
- if (sc->task != GNUNET_SCHEDULER_NO_TASK)
- GNUNET_SCHEDULER_cancel (sc->task);
- if (NULL != sc->client)
- GNUNET_CLIENT_disconnect (sc->client, GNUNET_NO);
- GNUNET_CONTAINER_multihashmap_destroy (sc->master_result_map);
- if (sc->requests != NULL)
- {
- GNUNET_assert (GNUNET_FS_uri_test_ksk (sc->uri));
- for (i = 0; i < sc->uri->data.ksk.keywordCount; i++)
- GNUNET_CONTAINER_multihashmap_destroy (sc->requests[i].results);
- }
- GNUNET_free_non_null (sc->requests);
- GNUNET_free_non_null (sc->emsg);
- GNUNET_FS_uri_destroy (sc->uri);
- GNUNET_free (sc);
- }
- /* end of fs_search.c */
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