2 This file is part of GNUnet.
3 (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
23 * @brief shared definitions for the FS library
24 * @author Igor Wronsky, Christian Grothoff
29 #include "gnunet_constants.h"
30 #include "gnunet_datastore_service.h"
31 #include "gnunet_dht_service.h"
32 #include "gnunet_fs_service.h"
33 #include "gnunet_block_lib.h"
38 * Size of the individual blocks used for file-sharing.
40 #define DBLOCK_SIZE (32*1024)
43 * Pick a multiple of 2 here to achive 8-byte alignment! We also
44 * probably want DBlocks to have (roughly) the same size as IBlocks.
45 * With SHA-512, the optimal value is 32768 byte / 128 byte = 256 (128
46 * byte = 2 * 512 bits). DO NOT CHANGE!
48 #define CHK_PER_INODE 256
51 * Maximum size for a file to be considered for inlining in a
54 #define MAX_INLINE_SIZE 65536
57 * Name of the directory with top-level searches.
59 #define GNUNET_FS_SYNC_PATH_MASTER_SEARCH "search"
62 * Name of the directory with sub-searches (namespace-updates).
64 #define GNUNET_FS_SYNC_PATH_CHILD_SEARCH "search-child"
67 * Name of the directory with master downloads (not associated
68 * with search or part of another download).
70 #define GNUNET_FS_SYNC_PATH_MASTER_DOWNLOAD "download"
73 * Name of the directory with downloads that are part of another
74 * download or a search.
76 #define GNUNET_FS_SYNC_PATH_CHILD_DOWNLOAD "download-child"
79 * Name of the directory with publishing operations.
81 #define GNUNET_FS_SYNC_PATH_MASTER_PUBLISH "publish"
84 * Name of the directory with files that are being published
86 #define GNUNET_FS_SYNC_PATH_FILE_INFO "publish-file"
89 * Name of the directory with unindex operations.
91 #define GNUNET_FS_SYNC_PATH_MASTER_UNINDEX "unindex"
95 * @brief complete information needed
102 * Total size of the file in bytes. (network byte order (!))
104 uint64_t file_length;
107 * Query and key of the top GNUNET_EC_IBlock.
109 struct ContentHashKey chk;
115 * Information about a file and its location
116 * (peer claiming to share the file).
121 * Information about the shared file.
123 struct FileIdentifier fi;
126 * Identity of the peer sharing the file.
128 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded peer;
131 * Time when this location URI expires.
133 struct GNUNET_TIME_Absolute expirationTime;
136 * RSA signature over the GNUNET_EC_FileIdentifier,
137 * GNUNET_hash of the peer and expiration time.
139 struct GNUNET_CRYPTO_RsaSignature contentSignature;
149 * Content-hash-key (simple file).
154 * Signed key space (file in namespace).
159 * Keyword search key (query with keywords).
164 * Location (chk with identity of hosting peer).
170 * A Universal Resource Identifier (URI), opaque.
184 * Keywords start with a '+' if they are
185 * mandatory (in which case the '+' is NOT
186 * part of the keyword) and with a
187 * simple space if they are optional
188 * (in which case the space is ALSO not
189 * part of the actual keyword).
191 * Double-quotes to protect spaces and
192 * %-encoding are NOT used internally
193 * (only in URI-strings).
198 * Size of the keywords array.
200 unsigned int keywordCount;
206 * Hash of the public key for the namespace.
208 GNUNET_HashCode namespace;
211 * Human-readable identifier chosen for this
212 * entry in the namespace.
218 * Information needed to retrieve a file (content-hash-key
221 struct FileIdentifier chk;
224 * Information needed to retrieve a file including signed
225 * location (identity of a peer) of the content.
234 * Information for a file or directory that is
235 * about to be published.
237 struct GNUNET_FS_FileInformation
241 * Files in a directory are kept as a linked list.
243 struct GNUNET_FS_FileInformation *next;
246 * If this is a file in a directory, "dir" refers to
247 * the directory; otherwise NULL.
249 struct GNUNET_FS_FileInformation *dir;
252 * Handle to the master context.
254 struct GNUNET_FS_Handle *h;
257 * Pointer kept for the client.
262 * Metadata to use for the file.
264 struct GNUNET_CONTAINER_MetaData *meta;
267 * Keywords to use for KBlocks.
269 struct GNUNET_FS_Uri *keywords;
272 * CHK for this file or directory. NULL if
273 * we have not yet computed it.
275 struct GNUNET_FS_Uri *chk_uri;
278 * Block options for the file.
280 struct GNUNET_FS_BlockOptions bo;
283 * At what time did we start this upload?
285 struct GNUNET_TIME_Absolute start_time;
288 * Under what filename is this struct serialized
289 * (for operational persistence). Should be determined
295 * Encoder being used to publish this file.
297 struct GNUNET_FS_TreeEncoder *te;
300 * Error message (non-NULL if this operation failed).
305 * Name of the file or directory (must be an absolute path).
310 * Data describing either the file or the directory.
322 * Function that can be used to read the data for the file.
324 GNUNET_FS_DataReader reader;
327 * Closure for reader.
332 * If this file is being indexed, this value is set to the hash
333 * over the entire file (when the indexing process is started).
334 * Otherwise this field is not used.
336 GNUNET_HashCode file_id;
339 * Size of the file (in bytes).
344 * Should the file be indexed or inserted?
349 * Is "file_id" already valid? Set to GNUNET_YES once the hash
350 * has been calculated.
355 * Has the service confirmed our INDEX_START request?
356 * GNUNET_YES if this step has been completed.
358 int index_start_confirmed;
363 * Data for a directory.
369 * Linked list of entries in the directory.
371 struct GNUNET_FS_FileInformation *entries;
374 * Size of the directory itself (in bytes); 0 if the
375 * size has not yet been calculated.
380 * Pointer to the data for the directory (or NULL if not
390 * Is this struct for a file or directory?
395 * Are we done publishing this file?
403 * The job is now ready to run and should use the given client
404 * handle to communicate with the FS service.
407 * @param client handle to use for FS communication
409 typedef void (*GNUNET_FS_QueueStart) (void *cls,
410 struct GNUNET_CLIENT_Connection * client);
414 * The job must now stop to run and should destry the client handle as
415 * soon as possible (ideally prior to returning).
417 typedef void (*GNUNET_FS_QueueStop) (void *cls);
422 * Priorities for the queue.
424 enum GNUNET_FS_QueuePriority
427 * This is a probe (low priority).
429 GNUNET_FS_QUEUE_PRIORITY_PROBE,
434 GNUNET_FS_QUEUE_PRIORITY_NORMAL
439 * Entry in the job queue.
441 struct GNUNET_FS_QueueEntry
444 * This is a linked list.
446 struct GNUNET_FS_QueueEntry *next;
449 * This is a linked list.
451 struct GNUNET_FS_QueueEntry *prev;
454 * Function to call when the job is started.
456 GNUNET_FS_QueueStart start;
459 * Function to call when the job needs to stop (or is done / dequeued).
461 GNUNET_FS_QueueStop stop;
464 * Closure for start and stop.
469 * Handle to FS primary context.
471 struct GNUNET_FS_Handle *h;
474 * Client handle, or NULL if job is not running.
476 struct GNUNET_CLIENT_Connection *client;
479 * Time the job was originally queued.
481 struct GNUNET_TIME_Absolute queue_time;
484 * Time the job was started last.
486 struct GNUNET_TIME_Absolute start_time;
489 * Total amount of time the job has been running (except for the
492 struct GNUNET_TIME_Relative run_time;
495 * How many blocks do the active downloads have?
500 * How important is this download?
502 enum GNUNET_FS_QueuePriority priority;
505 * How often have we (re)started this download?
507 unsigned int start_times;
515 * Information we store for each search result.
517 struct GNUNET_FS_SearchResult
521 * Search context this result belongs to.
523 struct GNUNET_FS_SearchContext *sc;
526 * URI to which this search result refers to.
528 struct GNUNET_FS_Uri *uri;
531 * Metadata for the search result.
533 struct GNUNET_CONTAINER_MetaData *meta;
536 * Client info for this search result.
541 * ID of a job that is currently probing this results' availability
542 * (NULL if we are not currently probing).
544 struct GNUNET_FS_DownloadContext *probe_ctx;
547 * ID of an associated download based on this search result (or
550 struct GNUNET_FS_DownloadContext *download;
553 * If this search result triggered an update search, this field
554 * links to the update search.
556 struct GNUNET_FS_SearchContext *update_search;
559 * Name under which this search result is stored on disk.
564 * Bitmap that specifies precisely which keywords have been matched already.
566 uint8_t *keyword_bitmap;
569 * Key for the search result
574 * ID of the task that will clean up the probe_ctx should it not
575 * complete on time (and that will need to be cancelled if we clean
576 * up the search result before then).
578 GNUNET_SCHEDULER_TaskIdentifier probe_cancel_task;
581 * When did the current probe become active?
583 struct GNUNET_TIME_Absolute probe_active_time;
586 * How much longer should we run the current probe before giving up?
588 struct GNUNET_TIME_Relative remaining_probe_time;
591 * Number of mandatory keywords for which we have NOT yet found the
592 * search result; when this value hits zero, the search result is
593 * given to the callback.
595 uint32_t mandatory_missing;
598 * Number of optional keywords under which this result was also
601 uint32_t optional_support;
604 * Number of availability tests that have succeeded for this result.
606 uint32_t availability_success;
609 * Number of availability trials that we have performed for this
612 uint32_t availability_trials;
618 * Add a job to the queue.
620 * @param h handle to the overall FS state
621 * @param start function to call to begin the job
622 * @param stop function to call to pause the job, or on dequeue (if the job was running)
623 * @param cls closure for start and stop
624 * @param blocks number of blocks this download has
625 * @param priority how important is this download
626 * @return queue handle
628 struct GNUNET_FS_QueueEntry *
629 GNUNET_FS_queue_ (struct GNUNET_FS_Handle *h, GNUNET_FS_QueueStart start,
630 GNUNET_FS_QueueStop stop, void *cls, unsigned int blocks,
631 enum GNUNET_FS_QueuePriority priority);
635 * Dequeue a job from the queue.
636 * @param qh handle for the job
639 GNUNET_FS_dequeue_ (struct GNUNET_FS_QueueEntry *qh);
643 * Function that provides data by reading from a file.
645 * @param cls closure (points to the file information)
646 * @param offset offset to read from; it is possible
647 * that the caller might need to go backwards
649 * @param max maximum number of bytes that should be
650 * copied to buf; readers are not allowed
651 * to provide less data unless there is an error;
652 * a value of "0" will be used at the end to allow
653 * the reader to clean up its internal state
654 * @param buf where the reader should write the data
655 * @param emsg location for the reader to store an error message
656 * @return number of bytes written, usually "max", 0 on error
659 GNUNET_FS_data_reader_file_ (void *cls, uint64_t offset, size_t max, void *buf,
664 * Create the closure for the 'GNUNET_FS_data_reader_file_' callback.
666 * @param filename file to read
667 * @return closure to use
670 GNUNET_FS_make_file_reader_context_ (const char *filename);
675 * Function that provides data by copying from a buffer.
677 * @param cls closure (points to the buffer)
678 * @param offset offset to read from; it is possible
679 * that the caller might need to go backwards
681 * @param max maximum number of bytes that should be
682 * copied to buf; readers are not allowed
683 * to provide less data unless there is an error;
684 * a value of "0" will be used at the end to allow
685 * the reader to clean up its internal state
686 * @param buf where the reader should write the data
687 * @param emsg location for the reader to store an error message
688 * @return number of bytes written, usually "max", 0 on error
691 GNUNET_FS_data_reader_copy_ (void *cls, uint64_t offset, size_t max, void *buf,
695 * Notification of FS that a search probe has made progress.
696 * This function is used INSTEAD of the client's event handler
697 * for downloads where the GNUNET_FS_DOWNLOAD_IS_PROBE flag is set.
699 * @param cls closure, always NULL (!), actual closure
700 * is in the client-context of the info struct
701 * @param info details about the event, specifying the event type
702 * and various bits about the event
703 * @return client-context (for the next progress call
704 * for this operation; should be set to NULL for
705 * SUSPEND and STOPPED events). The value returned
706 * will be passed to future callbacks in the respective
707 * field in the GNUNET_FS_ProgressInfo struct.
710 GNUNET_FS_search_probe_progress_ (void *cls,
711 const struct GNUNET_FS_ProgressInfo *info);
715 * Main function that performs the upload.
717 * @param cls "struct GNUNET_FS_PublishContext" identifies the upload
718 * @param tc task context
721 GNUNET_FS_publish_main_ (void *cls,
722 const struct GNUNET_SCHEDULER_TaskContext *tc);
726 * Function called once the hash of the file
727 * that is being unindexed has been computed.
729 * @param cls closure, unindex context
730 * @param file_id computed hash, NULL on error
733 GNUNET_FS_unindex_process_hash_ (void *cls, const GNUNET_HashCode * file_id);
737 * Fill in all of the generic fields for a publish event and call the
740 * @param pi structure to fill in
741 * @param pc overall publishing context
742 * @param p file information for the file being published
743 * @param offset where in the file are we so far
744 * @return value returned from callback
747 GNUNET_FS_publish_make_status_ (struct GNUNET_FS_ProgressInfo *pi,
748 struct GNUNET_FS_PublishContext *pc,
749 const struct GNUNET_FS_FileInformation *p,
754 * Fill in all of the generic fields for a download event and call the
757 * @param pi structure to fill in
758 * @param dc overall download context
761 GNUNET_FS_download_make_status_ (struct GNUNET_FS_ProgressInfo *pi,
762 struct GNUNET_FS_DownloadContext *dc);
766 * Task that creates the initial (top-level) download
767 * request for the file.
769 * @param cls the 'struct GNUNET_FS_DownloadContext'
770 * @param tc scheduler context
773 GNUNET_FS_download_start_task_ (void *cls,
774 const struct GNUNET_SCHEDULER_TaskContext *tc);
779 * Fill in all of the generic fields for
780 * an unindex event and call the callback.
782 * @param pi structure to fill in
783 * @param uc overall unindex context
784 * @param offset where we are in the file (for progress)
787 GNUNET_FS_unindex_make_status_ (struct GNUNET_FS_ProgressInfo *pi,
788 struct GNUNET_FS_UnindexContext *uc,
792 * Fill in all of the generic fields for a search event and
795 * @param pi structure to fill in
796 * @param sc overall search context
797 * @return value returned by the callback
800 GNUNET_FS_search_make_status_ (struct GNUNET_FS_ProgressInfo *pi,
801 struct GNUNET_FS_SearchContext *sc);
805 * Connect to the datastore and remove the blocks.
807 * @param uc context for the unindex operation.
810 GNUNET_FS_unindex_do_remove_ (struct GNUNET_FS_UnindexContext *uc);
813 * Build the request and actually initiate the search using the
816 * @param sc search context
817 * @return GNUNET_OK on success, GNUNET_SYSERR on error
820 GNUNET_FS_search_start_searching_ (struct GNUNET_FS_SearchContext *sc);
823 * Start the downloading process (by entering the queue).
825 * @param dc our download context
828 GNUNET_FS_download_start_downloading_ (struct GNUNET_FS_DownloadContext *dc);
832 * Start download probes for the given search result.
834 * @param sr the search result
837 GNUNET_FS_search_start_probe_ (struct GNUNET_FS_SearchResult *sr);
840 * Remove serialization/deserialization file from disk.
842 * @param h master context
843 * @param ext component of the path
844 * @param ent entity identifier
847 GNUNET_FS_remove_sync_file_ (struct GNUNET_FS_Handle *h, const char *ext,
852 * Remove serialization/deserialization directory from disk.
854 * @param h master context
855 * @param ext component of the path
856 * @param uni unique name of parent
859 GNUNET_FS_remove_sync_dir_ (struct GNUNET_FS_Handle *h, const char *ext,
864 * Synchronize this file-information struct with its mirror
865 * on disk. Note that all internal FS-operations that change
866 * file information data should already call "sync" internally,
867 * so this function is likely not useful for clients.
869 * @param fi the struct to sync
872 GNUNET_FS_file_information_sync_ (struct GNUNET_FS_FileInformation *f);
875 * Synchronize this publishing struct with its mirror
876 * on disk. Note that all internal FS-operations that change
877 * publishing structs should already call "sync" internally,
878 * so this function is likely not useful for clients.
880 * @param pc the struct to sync
883 GNUNET_FS_publish_sync_ (struct GNUNET_FS_PublishContext *pc);
886 * Synchronize this unindex struct with its mirror
887 * on disk. Note that all internal FS-operations that change
888 * publishing structs should already call "sync" internally,
889 * so this function is likely not useful for clients.
891 * @param uc the struct to sync
894 GNUNET_FS_unindex_sync_ (struct GNUNET_FS_UnindexContext *uc);
897 * Synchronize this search struct with its mirror
898 * on disk. Note that all internal FS-operations that change
899 * publishing structs should already call "sync" internally,
900 * so this function is likely not useful for clients.
902 * @param sc the struct to sync
905 GNUNET_FS_search_sync_ (struct GNUNET_FS_SearchContext *sc);
908 * Synchronize this search result with its mirror
909 * on disk. Note that all internal FS-operations that change
910 * publishing structs should already call "sync" internally,
911 * so this function is likely not useful for clients.
913 * @param sr the struct to sync
916 GNUNET_FS_search_result_sync_ (struct GNUNET_FS_SearchResult *sr);
919 * Synchronize this download struct with its mirror
920 * on disk. Note that all internal FS-operations that change
921 * publishing structs should already call "sync" internally,
922 * so this function is likely not useful for clients.
924 * @param dc the struct to sync
927 GNUNET_FS_download_sync_ (struct GNUNET_FS_DownloadContext *dc);
930 * Create SUSPEND event for the given publish operation
931 * and then clean up our state (without stop signal).
933 * @param cls the 'struct GNUNET_FS_PublishContext' to signal for
936 GNUNET_FS_publish_signal_suspend_ (void *cls);
939 * Create SUSPEND event for the given search operation
940 * and then clean up our state (without stop signal).
942 * @param cls the 'struct GNUNET_FS_SearchContext' to signal for
945 GNUNET_FS_search_signal_suspend_ (void *cls);
948 * Create SUSPEND event for the given download operation
949 * and then clean up our state (without stop signal).
951 * @param cls the 'struct GNUNET_FS_DownloadContext' to signal for
954 GNUNET_FS_download_signal_suspend_ (void *cls);
957 * Create SUSPEND event for the given unindex operation
958 * and then clean up our state (without stop signal).
960 * @param cls the 'struct GNUNET_FS_UnindexContext' to signal for
963 GNUNET_FS_unindex_signal_suspend_ (void *cls);
966 * Function signature of the functions that can be called
967 * to trigger suspend signals and clean-up for top-level
972 typedef void (*SuspendSignalFunction) (void *cls);
975 * We track all of the top-level activities of FS
976 * so that we can signal 'suspend' on shutdown.
978 struct TopLevelActivity
981 * This is a doubly-linked list.
983 struct TopLevelActivity *next;
986 * This is a doubly-linked list.
988 struct TopLevelActivity *prev;
991 * Function to call for suspend-signalling and clean up.
993 SuspendSignalFunction ssf;
996 * Closure for 'ssf' (some struct GNUNET_FS_XXXHandle*)
1003 * Create a top-level activity entry.
1005 * @param h global fs handle
1006 * @param ssf suspend signal function to use
1007 * @param ssf_cls closure for ssf
1008 * @return fresh top-level activity handle
1010 struct TopLevelActivity *
1011 GNUNET_FS_make_top (struct GNUNET_FS_Handle *h, SuspendSignalFunction ssf,
1016 * Destroy a top-level activity entry.
1018 * @param h global fs handle
1019 * @param top top level activity entry
1022 GNUNET_FS_end_top (struct GNUNET_FS_Handle *h, struct TopLevelActivity *top);
1027 * Master context for most FS operations.
1029 struct GNUNET_FS_Handle
1032 * Configuration to use.
1034 const struct GNUNET_CONFIGURATION_Handle *cfg;
1037 * Name of our client.
1042 * Function to call with updates on our progress.
1044 GNUNET_FS_ProgressCallback upcb;
1052 * Head of DLL of top-level activities.
1054 struct TopLevelActivity *top_head;
1057 * Tail of DLL of top-level activities.
1059 struct TopLevelActivity *top_tail;
1062 * Head of DLL of running jobs.
1064 struct GNUNET_FS_QueueEntry *running_head;
1067 * Tail of DLL of running jobs.
1069 struct GNUNET_FS_QueueEntry *running_tail;
1072 * Head of DLL of pending jobs.
1074 struct GNUNET_FS_QueueEntry *pending_head;
1077 * Tail of DLL of pending jobs.
1079 struct GNUNET_FS_QueueEntry *pending_tail;
1082 * Task that processes the jobs in the running and pending queues
1083 * (and moves jobs around as needed).
1085 GNUNET_SCHEDULER_TaskIdentifier queue_job;
1088 * Average time we take for a single request to be satisfied.
1089 * FIXME: not yet calcualted properly...
1091 struct GNUNET_TIME_Relative avg_block_latency;
1094 * How many actual downloads do we have running right now?
1096 unsigned int active_downloads;
1099 * How many blocks do the active downloads have?
1101 unsigned int active_blocks;
1106 enum GNUNET_FS_Flags flags;
1109 * Maximum number of parallel downloads.
1111 unsigned int max_parallel_downloads;
1114 * Maximum number of parallel requests.
1116 unsigned int max_parallel_requests;
1122 * Handle for controlling a publication process.
1124 struct GNUNET_FS_PublishContext
1127 * Handle to the global fs context.
1129 struct GNUNET_FS_Handle *h;
1132 * Our top-level activity entry (if we are top-level, otherwise NULL).
1134 struct TopLevelActivity *top;
1137 * File-structure that is being shared.
1139 struct GNUNET_FS_FileInformation *fi;
1142 * Namespace that we are publishing in, NULL if we have no namespace.
1144 struct GNUNET_FS_Namespace *namespace;
1147 * ID of the content in the namespace, NULL if we have no namespace.
1152 * ID for future updates, NULL if we have no namespace or no updates.
1157 * Filename used for serializing information about this operation
1158 * (should be determined using 'mktemp').
1160 char *serialization;
1163 * Our own client handle for the FS service; only briefly used when
1164 * we start to index a file, otherwise NULL.
1166 struct GNUNET_CLIENT_Connection *client;
1169 * Current position in the file-tree for the upload.
1171 struct GNUNET_FS_FileInformation *fi_pos;
1174 * Non-null if we are currently hashing a file.
1176 struct GNUNET_CRYPTO_FileHashContext *fhc;
1179 * Connection to the datastore service.
1181 struct GNUNET_DATASTORE_Handle *dsh;
1184 * Queue entry for reservation/unreservation.
1186 struct GNUNET_DATASTORE_QueueEntry *qre;
1189 * Context for SKS publishing operation that is part of this publishing operation
1190 * (NULL if not active).
1192 struct GNUNET_FS_PublishSksContext *sks_pc;
1195 * Context for KSK publishing operation that is part of this publishing operation
1196 * (NULL if not active).
1198 struct GNUNET_FS_PublishKskContext *ksk_pc;
1201 * ID of the task performing the upload. NO_TASK if the upload has
1204 GNUNET_SCHEDULER_TaskIdentifier upload_task;
1207 * Storage space to reserve for the operation.
1209 uint64_t reserve_space;
1212 * Overall number of entries to reserve for the
1213 * publish operation.
1215 uint32_t reserve_entries;
1218 * Options for publishing.
1220 enum GNUNET_FS_PublishOptions options;
1223 * Space reservation ID with datastore service
1229 * Set to GNUNET_YES if all processing has completed.
1234 * Flag set to GNUNET_YES if the next callback from
1235 * GNUNET_FS_file_information_inspect should be skipped because it
1236 * is for the directory which was already processed with the parent.
1238 int skip_next_fi_callback;
1243 * Phases of unindex processing (state machine).
1248 * We're currently hashing the file.
1250 UNINDEX_STATE_HASHING = 0,
1253 * We're telling the datastore to delete
1254 * the respective entries.
1256 UNINDEX_STATE_DS_REMOVE = 1,
1259 * We're notifying the FS service about
1262 UNINDEX_STATE_FS_NOTIFY = 2,
1267 UNINDEX_STATE_COMPLETE = 3,
1270 * We've encountered a fatal error.
1272 UNINDEX_STATE_ERROR = 4
1277 * Handle for controlling an unindexing operation.
1279 struct GNUNET_FS_UnindexContext
1283 * Global FS context.
1285 struct GNUNET_FS_Handle *h;
1288 * Our top-level activity entry.
1290 struct TopLevelActivity *top;
1293 * Name of the file that we are unindexing.
1298 * Short name under which we are serializing the state of this operation.
1300 char *serialization;
1303 * Connection to the FS service, only valid during the
1304 * UNINDEX_STATE_FS_NOTIFY phase.
1306 struct GNUNET_CLIENT_Connection *client;
1309 * Connection to the datastore service, only valid during the
1310 * UNINDEX_STATE_DS_NOTIFY phase.
1312 struct GNUNET_DATASTORE_Handle *dsh;
1315 * Pointer kept for the client.
1320 * Merkle-ish tree encoder context.
1322 struct GNUNET_FS_TreeEncoder *tc;
1325 * Handle used to read the file.
1327 struct GNUNET_DISK_FileHandle *fh;
1330 * Error message, NULL on success.
1335 * Context for hashing of the file.
1337 struct GNUNET_CRYPTO_FileHashContext *fhc;
1340 * Overall size of the file.
1345 * When did we start?
1347 struct GNUNET_TIME_Absolute start_time;
1350 * Hash of the file's contents (once computed).
1352 GNUNET_HashCode file_id;
1355 * Current operatinonal phase.
1357 enum UnindexState state;
1363 * Information we keep for each keyword in
1366 struct SearchRequestEntry
1369 * Hash of the original keyword, also known as the
1370 * key (for decrypting the KBlock).
1372 GNUNET_HashCode key;
1375 * Hash of the public key, also known as the query.
1377 GNUNET_HashCode query;
1380 * Map that contains a "struct GNUNET_FS_SearchResult" for each result that
1381 * was found under this keyword. Note that the entries will point
1382 * to the same locations as those in the master result map (in
1383 * "struct GNUNET_FS_SearchContext"), so they should not be freed.
1384 * The key for each entry is the XOR of the key and query in the CHK
1385 * URI (as a unique identifier for the search result).
1387 struct GNUNET_CONTAINER_MultiHashMap *results;
1390 * Is this keyword a mandatory keyword
1391 * (started with '+')?
1399 * Handle for controlling a search.
1401 struct GNUNET_FS_SearchContext
1404 * Handle to the global FS context.
1406 struct GNUNET_FS_Handle *h;
1409 * Our top-level activity entry (if we are top-level, otherwise NULL).
1411 struct TopLevelActivity *top;
1414 * List of keywords that we're looking for.
1416 struct GNUNET_FS_Uri *uri;
1419 * For update-searches, link to the search result that triggered
1420 * the update search; otherwise NULL.
1422 struct GNUNET_FS_SearchResult *psearch_result;
1425 * Connection to the FS service.
1427 struct GNUNET_CLIENT_Connection *client;
1430 * Pointer we keep for the client.
1435 * Name of the file on disk we use for persistence.
1437 char *serialization;
1440 * Error message (non-NULL if this operation failed).
1445 * Map that contains a "struct GNUNET_FS_SearchResult" for each result that
1446 * was found in the search. The key for each entry is the XOR of
1447 * the key and query in the CHK URI (as a unique identifier for the
1450 struct GNUNET_CONTAINER_MultiHashMap *master_result_map;
1453 * Per-keyword information for a keyword search. This array will
1454 * have exactly as many entries as there were keywords.
1456 struct SearchRequestEntry *requests;
1459 * When did we start?
1461 struct GNUNET_TIME_Absolute start_time;
1464 * ID of a task that is using this struct and that must be cancelled
1465 * when the search is being stopped (if not
1466 * GNUNET_SCHEDULER_NO_TASK). Used for the task that adds some
1467 * artificial delay when trying to reconnect to the FS service.
1469 GNUNET_SCHEDULER_TaskIdentifier task;
1472 * How many of the entries in the search request
1473 * map have been passed to the service so far?
1475 unsigned int search_request_map_offset;
1478 * How many of the keywords in the KSK
1479 * map have been passed to the service so far?
1481 unsigned int keyword_offset;
1484 * Anonymity level for the search.
1489 * Number of mandatory keywords in this query.
1491 uint32_t mandatory_count;
1494 * Options for the search.
1496 enum GNUNET_FS_SearchOptions options;
1501 * FSM for possible states a block can go through. The typical
1502 * order of progression is linear through the states, alternatives
1503 * are documented in the comments.
1505 enum BlockRequestState
1508 * Initial state, block has only been allocated (since it is
1509 * relevant to the overall download request).
1514 * We've checked the block on the path down the tree, and the
1515 * content on disk did match the desired CHK, but not all
1516 * the way down, so at the bottom some blocks will still
1517 * need to be reconstructed).
1519 BRS_RECONSTRUCT_DOWN = 1,
1522 * We've calculated the CHK bottom-up based on the meta data.
1523 * This may work, but if it did we have to write the meta data to
1524 * disk at the end (and we still need to check against the
1527 BRS_RECONSTRUCT_META_UP = 2,
1530 * We've calculated the CHK bottom-up based on what we have on
1531 * disk, which may not be what the desired CHK is. If the
1532 * reconstructed CHKs match whatever comes from above, we're
1533 * done with the respective subtree.
1535 BRS_RECONSTRUCT_UP = 3,
1538 * We've determined the real, desired CHK for this block
1539 * (full tree reconstruction failed), request is now pending.
1540 * If the CHK that bubbled up through reconstruction did match
1541 * the top-level request, the state machine for the subtree
1542 * would have moved to BRS_DOWNLOAD_UP.
1547 * We've successfully downloaded this block, but the children
1548 * still need to be either downloaded or verified (download
1549 * request propagates down). If the download fails, the
1550 * state machine for this block may move to
1551 * BRS_DOWNLOAD_ERROR instead.
1553 BRS_DOWNLOAD_DOWN = 5,
1556 * This block and all of its children have been downloaded
1557 * successfully (full completion propagates up).
1559 BRS_DOWNLOAD_UP = 6,
1562 * We got a block back that matched the query but did not hash to
1563 * the key (malicious publisher or hash collision); this block
1564 * can never be downloaded (error propagates up).
1571 * Information about an active download request.
1573 struct DownloadRequest
1576 * While pending, we keep all download requests in a doubly-linked list.
1578 struct DownloadRequest *next;
1581 * While pending, we keep all download requests in a doubly-linked list.
1583 struct DownloadRequest *prev;
1586 * Parent in the CHK-tree.
1588 struct DownloadRequest *parent;
1591 * Array (!) of child-requests, or NULL for the bottom of the tree.
1593 struct DownloadRequest **children;
1596 * CHK for the request for this block (set during reconstruction
1597 * to what we have on disk, later to what we want to have).
1599 struct ContentHashKey chk;
1602 * Offset of the corresponding block. Specifically, first (!) byte of
1603 * the first DBLOCK in the subtree induced by block represented by
1609 * Number of entries in 'children' array.
1611 unsigned int num_children;
1614 * Depth of the corresponding block in the tree. 0==DBLOCKs.
1619 * Offset of the CHK for this block in the parent block.
1621 unsigned int chk_idx;
1626 enum BlockRequestState state;
1629 * GNUNET_YES if this entry is in the pending list.
1637 * (recursively) free download request structure
1639 * @param dr request to free
1642 GNUNET_FS_free_download_request_ (struct DownloadRequest *dr);
1646 * Context for controlling a download.
1648 struct GNUNET_FS_DownloadContext
1652 * Global FS context.
1654 struct GNUNET_FS_Handle *h;
1657 * Our top-level activity entry (if we are top-level, otherwise NULL).
1659 struct TopLevelActivity *top;
1662 * Connection to the FS service.
1664 struct GNUNET_CLIENT_Connection *client;
1667 * Parent download (used when downloading files
1670 struct GNUNET_FS_DownloadContext *parent;
1673 * Associated search (used when downloading files
1674 * based on search results), or NULL for none.
1676 struct GNUNET_FS_SearchResult *search;
1679 * Head of list of child downloads.
1681 struct GNUNET_FS_DownloadContext *child_head;
1684 * Tail of list of child downloads.
1686 struct GNUNET_FS_DownloadContext *child_tail;
1689 * Previous download belonging to the same parent.
1691 struct GNUNET_FS_DownloadContext *prev;
1694 * Next download belonging to the same parent.
1696 struct GNUNET_FS_DownloadContext *next;
1699 * Context kept for the client.
1704 * URI that identifies the file that we are downloading.
1706 struct GNUNET_FS_Uri *uri;
1709 * Known meta-data for the file (can be NULL).
1711 struct GNUNET_CONTAINER_MetaData *meta;
1714 * Error message, NULL if we're doing OK.
1719 * Random portion of filename we use for syncing state of this
1722 char *serialization;
1725 * Where are we writing the data (name of the
1726 * file, can be NULL!).
1731 * Where are we writing the data temporarily (name of the
1732 * file, can be NULL!); used if we do not have a permanent
1733 * name and we are a directory and we do a recursive download.
1735 char *temp_filename;
1738 * Our entry in the job queue.
1740 struct GNUNET_FS_QueueEntry *job_queue;
1743 * Non-NULL if we are currently having a request for
1744 * transmission pending with the client handle.
1746 struct GNUNET_CLIENT_TransmitHandle *th;
1749 * Tree encoder used for the reconstruction.
1751 struct GNUNET_FS_TreeEncoder *te;
1754 * File handle for reading data from an existing file
1755 * (to pass to tree encoder).
1757 struct GNUNET_DISK_FileHandle *rfh;
1760 * Map of active requests (those waiting for a response). The key
1761 * is the hash of the encryped block (aka query).
1763 struct GNUNET_CONTAINER_MultiHashMap *active;
1766 * Head of linked list of pending requests.
1768 struct DownloadRequest *pending_head;
1771 * Head of linked list of pending requests.
1773 struct DownloadRequest *pending_tail;
1776 * Top-level download request.
1778 struct DownloadRequest *top_request;
1781 * Identity of the peer having the content, or all-zeros
1782 * if we don't know of such a peer.
1784 struct GNUNET_PeerIdentity target;
1787 * ID of a task that is using this struct and that must be cancelled
1788 * when the download is being stopped (if not
1789 * GNUNET_SCHEDULER_NO_TASK). Used for the task that adds some
1790 * artificial delay when trying to reconnect to the FS service or
1791 * the task processing incrementally the data on disk, or the
1792 * task requesting blocks, etc.
1794 GNUNET_SCHEDULER_TaskIdentifier task;
1797 * What is the first offset that we're interested
1803 * How many bytes starting from offset are desired?
1804 * This is NOT the overall length of the file!
1809 * How many bytes have we already received within
1810 * the specified range (DBlocks only).
1815 * What was the size of the file on disk that we're downloading
1816 * before we started? Used to detect if there is a point in
1817 * checking an existing block on disk for matching the desired
1818 * content. 0 if the file did not exist already.
1820 uint64_t old_file_size;
1823 * Time download was started.
1825 struct GNUNET_TIME_Absolute start_time;
1828 * Desired level of anonymity.
1833 * The depth of the file-tree.
1835 unsigned int treedepth;
1838 * Options for the download.
1840 enum GNUNET_FS_DownloadOptions options;
1843 * Flag set upon transitive completion (includes child downloads).
1844 * This flag is only set to GNUNET_YES for directories where all
1845 * child-downloads have also completed (and signalled completion).
1850 * Have we started the receive continuation yet?
1858 * Information about an (updateable) node in the
1861 struct NamespaceUpdateNode
1864 * Identifier for this node.
1869 * Identifier of children of this node.
1874 * Metadata for this entry.
1876 struct GNUNET_CONTAINER_MetaData *md;
1879 * URI of this entry in the namespace.
1881 struct GNUNET_FS_Uri *uri;
1884 * Namespace update generation ID. Used to ensure
1885 * freshness of the tree_id.
1890 * TREE this entry belongs to (if nug is current).
1892 unsigned int tree_id;
1897 struct GNUNET_FS_Namespace
1901 * Handle to the FS service context.
1903 struct GNUNET_FS_Handle *h;
1906 * Array with information about nodes in the namespace.
1908 struct NamespaceUpdateNode **update_nodes;
1911 * Private key for the namespace.
1913 struct GNUNET_CRYPTO_RsaPrivateKey *key;
1916 * Hash map mapping identifiers of update nodes
1917 * to the update nodes (initialized on-demand).
1919 struct GNUNET_CONTAINER_MultiHashMap *update_map;
1922 * Name of the file with the private key.
1927 * Name of the namespace.
1932 * Size of the update nodes array.
1934 unsigned int update_node_count;
1937 * Reference counter.
1942 * Generator for unique nug numbers.
1944 unsigned int nug_gen;
1949 /* end of fs_api.h */