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3 (C) 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)
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21 * @file include/gnunet_fs_service.h
22 * @brief API for file-sharing via GNUnet
23 * @author Christian Grothoff
25 #ifndef GNUNET_FS_LIB_H
26 #define GNUNET_FS_LIB_H
28 #include "gnunet_util_lib.h"
29 #include "gnunet_scheduler_lib.h"
34 #if 0 /* keep Emacsens' auto-indent happy */
40 * Version number of the implementation.
43 * 1.x.x: initial version with triple GNUNET_hash and merkle tree
44 * 2.x.x: root node with mime-type, filename and version number
45 * 2.1.x: combined GNUNET_EC_ContentHashKey/3HASH encoding with 25:1 super-nodes
46 * 2.2.x: with directories
47 * 3.0.x: with namespaces
48 * 3.1.x: with namespace meta-data
49 * 3.2.x: with collections
50 * 4.0.x: with expiration, variable meta-data, kblocks
51 * 4.1.x: with new error and configuration handling
52 * 5.0.x: with location URIs
53 * 6.0.0: with support for OR in KSKs
54 * 6.1.x: with simplified namespace support
55 * 9.0.0: CPS-style integrated API
57 #define GNUNET_FS_VERSION 0x00090001
60 /* ******************** URI API *********************** */
62 #define GNUNET_FS_URI_PREFIX "gnunet://fs/"
63 #define GNUNET_FS_URI_KSK_INFIX "ksk/"
64 #define GNUNET_FS_URI_SKS_INFIX "sks/"
65 #define GNUNET_FS_URI_CHK_INFIX "chk/"
66 #define GNUNET_FS_URI_LOC_INFIX "loc/"
70 * A Universal Resource Identifier (URI), opaque.
74 struct GNUNET_FS_DirScanner;
77 * Iterator over keywords
80 * @param keyword the keyword
81 * @param is_mandatory is the keyword mandatory (in a search)
82 * @return GNUNET_OK to continue to iterate, GNUNET_SYSERR to abort
84 typedef int (*GNUNET_FS_KeywordIterator) (void *cls, const char *keyword,
88 * Get a unique key from a URI. This is for putting URIs
89 * into HashMaps. The key may change between FS implementations.
91 * @param uri uri to convert to a unique key
92 * @param key wherer to store the unique key
95 GNUNET_FS_uri_to_key (const struct GNUNET_FS_Uri *uri, GNUNET_HashCode * key);
98 * Convert a URI to a UTF-8 String.
100 * @param uri uri to convert to a string
101 * @return the UTF-8 string
104 GNUNET_FS_uri_to_string (const struct GNUNET_FS_Uri *uri);
107 * Convert keyword URI to a human readable format
108 * (i.e. the search query that was used in the first place)
110 * @param uri ksk uri to convert to a string
111 * @return string with the keywords
114 GNUNET_FS_uri_ksk_to_string_fancy (const struct GNUNET_FS_Uri *uri);
118 * Add the given keyword to the set of keywords represented by the URI.
119 * Does nothing if the keyword is already present.
121 * @param uri ksk uri to modify
122 * @param keyword keyword to add
123 * @param is_mandatory is this keyword mandatory?
126 GNUNET_FS_uri_ksk_add_keyword (struct GNUNET_FS_Uri *uri, const char *keyword,
131 * Remove the given keyword from the set of keywords represented by the URI.
132 * Does nothing if the keyword is not present.
134 * @param uri ksk uri to modify
135 * @param keyword keyword to add
138 GNUNET_FS_uri_ksk_remove_keyword (struct GNUNET_FS_Uri *uri,
139 const char *keyword);
143 * Convert a UTF-8 String to a URI.
145 * @param uri string to parse
146 * @param emsg where to store the parser error message (if any)
147 * @return NULL on error
149 struct GNUNET_FS_Uri *
150 GNUNET_FS_uri_parse (const char *uri, char **emsg);
155 * @param uri uri to free
158 GNUNET_FS_uri_destroy (struct GNUNET_FS_Uri *uri);
162 * How many keywords are ANDed in this keyword URI?
164 * @param uri ksk uri to get the number of keywords from
165 * @return 0 if this is not a keyword URI
168 GNUNET_FS_uri_ksk_get_keyword_count (const struct GNUNET_FS_Uri *uri);
172 * Iterate over all keywords in this keyword URI.
174 * @param uri ksk uri to get the keywords from
175 * @param iterator function to call on each keyword
176 * @param iterator_cls closure for iterator
177 * @return -1 if this is not a keyword URI, otherwise number of
178 * keywords iterated over until iterator aborted
181 GNUNET_FS_uri_ksk_get_keywords (const struct GNUNET_FS_Uri *uri,
182 GNUNET_FS_KeywordIterator iterator,
187 * Obtain the identity of the peer offering the data
189 * @param uri the location URI to inspect
190 * @param peer where to store the identify of the peer (presumably) offering the content
191 * @return GNUNET_SYSERR if this is not a location URI, otherwise GNUNET_OK
194 GNUNET_FS_uri_loc_get_peer_identity (const struct GNUNET_FS_Uri *uri,
195 struct GNUNET_PeerIdentity *peer);
199 * Obtain the URI of the content itself.
201 * @param uri location URI to get the content URI from
202 * @return NULL if argument is not a location URI
204 struct GNUNET_FS_Uri *
205 GNUNET_FS_uri_loc_get_uri (const struct GNUNET_FS_Uri *uri);
209 * Obtain the expiration of the LOC URI.
211 * @param uri location URI to get the expiration from
212 * @return expiration time of the URI
214 struct GNUNET_TIME_Absolute
215 GNUNET_FS_uri_loc_get_expiration (const struct GNUNET_FS_Uri *uri);
219 * Construct a location URI (this peer will be used for the location).
221 * @param baseUri content offered by the sender
222 * @param cfg configuration information (used to find our hostkey)
223 * @param expiration_time how long will the content be offered?
224 * @return the location URI, NULL on error
226 struct GNUNET_FS_Uri *
227 GNUNET_FS_uri_loc_create (const struct GNUNET_FS_Uri *baseUri,
228 const struct GNUNET_CONFIGURATION_Handle *cfg,
229 struct GNUNET_TIME_Absolute expiration_time);
233 * Merge the sets of keywords from two KSK URIs.
235 * @param u1 first uri
236 * @param u2 second uri
237 * @return merged URI, NULL on error
239 struct GNUNET_FS_Uri *
240 GNUNET_FS_uri_ksk_merge (const struct GNUNET_FS_Uri *u1,
241 const struct GNUNET_FS_Uri *u2);
247 * @param uri the URI to duplicate
248 * @return copy of the URI
250 struct GNUNET_FS_Uri *
251 GNUNET_FS_uri_dup (const struct GNUNET_FS_Uri *uri);
255 * Create an FS URI from a single user-supplied string of keywords.
256 * The string is broken up at spaces into individual keywords.
257 * Keywords that start with "+" are mandatory. Double-quotes can
258 * be used to prevent breaking up strings at spaces (and also
259 * to specify non-mandatory keywords starting with "+").
261 * Keywords must contain a balanced number of double quotes and
262 * double quotes can not be used in the actual keywords (for
263 * example, the string '""foo bar""' will be turned into two
264 * "OR"ed keywords 'foo' and 'bar', not into '"foo bar"'.
266 * @param keywords the keyword string
267 * @param emsg where to store an error message
268 * @return an FS URI for the given keywords, NULL
269 * if keywords is not legal (i.e. empty).
271 struct GNUNET_FS_Uri *
272 GNUNET_FS_uri_ksk_create (const char *keywords, char **emsg);
276 * Create an FS URI from a user-supplied command line of keywords.
277 * Arguments should start with "+" to indicate mandatory
280 * @param argc number of keywords
281 * @param argv keywords (double quotes are not required for
282 * keywords containing spaces; however, double
283 * quotes are required for keywords starting with
284 * "+"); there is no mechanism for having double
285 * quotes in the actual keywords (if the user
286 * did specifically specify double quotes, the
287 * caller should convert each double quote
288 * into two single quotes).
289 * @return an FS URI for the given keywords, NULL
290 * if keywords is not legal (i.e. empty).
292 struct GNUNET_FS_Uri *
293 GNUNET_FS_uri_ksk_create_from_args (unsigned int argc, const char **argv);
297 * Test if two URIs are equal.
299 * @param u1 one of the URIs
300 * @param u2 the other URI
301 * @return GNUNET_YES if the URIs are equal
304 GNUNET_FS_uri_test_equal (const struct GNUNET_FS_Uri *u1,
305 const struct GNUNET_FS_Uri *u2);
309 * Is this a namespace URI?
311 * @param uri the uri to check
312 * @return GNUNET_YES if this is an SKS uri
315 GNUNET_FS_uri_test_sks (const struct GNUNET_FS_Uri *uri);
319 * Handle to one of our namespaces.
321 struct GNUNET_FS_Namespace;
325 * Create an SKS URI from a namespace and an identifier.
327 * @param ns namespace
328 * @param id identifier
329 * @param emsg where to store an error message
330 * @return an FS URI for the given namespace and identifier
332 struct GNUNET_FS_Uri *
333 GNUNET_FS_uri_sks_create (struct GNUNET_FS_Namespace *ns, const char *id,
338 * Create an SKS URI from a namespace ID and an identifier.
340 * @param nsid namespace ID
341 * @param id identifier
342 * @return an FS URI for the given namespace and identifier
344 struct GNUNET_FS_Uri *
345 GNUNET_FS_uri_sks_create_from_nsid (GNUNET_HashCode * nsid, const char *id);
349 * Get the ID of a namespace from the given
352 * @param uri the uri to get the namespace ID from
353 * @param nsid where to store the ID of the namespace
354 * @return GNUNET_OK on success
357 GNUNET_FS_uri_sks_get_namespace (const struct GNUNET_FS_Uri *uri,
358 GNUNET_HashCode * nsid);
362 * Get the content identifier of an SKS URI.
364 * @param uri the sks uri
365 * @return NULL on error (not a valid SKS URI)
368 GNUNET_FS_uri_sks_get_content_id (const struct GNUNET_FS_Uri *uri);
372 * Convert namespace URI to a human readable format
373 * (using the namespace description, if available).
375 * @param cfg configuration to use
376 * @param uri SKS uri to convert
377 * @return NULL on error (not an SKS URI)
380 GNUNET_FS_uri_sks_to_string_fancy (struct GNUNET_CONFIGURATION_Handle *cfg,
381 const struct GNUNET_FS_Uri *uri);
385 * Is this a keyword URI?
388 * @return GNUNET_YES if this is a KSK uri
391 GNUNET_FS_uri_test_ksk (const struct GNUNET_FS_Uri *uri);
395 * Is this a file (or directory) URI?
397 * @param uri the uri to check
398 * @return GNUNET_YES if this is a CHK uri
401 GNUNET_FS_uri_test_chk (const struct GNUNET_FS_Uri *uri);
405 * What is the size of the file that this URI
408 * @param uri the CHK (or LOC) URI to inspect
409 * @return size of the file as specified in the CHK URI
412 GNUNET_FS_uri_chk_get_file_size (const struct GNUNET_FS_Uri *uri);
416 * Is this a location URI?
418 * @param uri the uri to check
419 * @return GNUNET_YES if this is a LOC uri
422 GNUNET_FS_uri_test_loc (const struct GNUNET_FS_Uri *uri);
426 * Construct a keyword-URI from meta-data (take all entries
427 * in the meta-data and construct one large keyword URI
428 * that lists all keywords that can be found in the meta-data).
430 * @param md metadata to use
431 * @return NULL on error, otherwise a KSK URI
433 struct GNUNET_FS_Uri *
434 GNUNET_FS_uri_ksk_create_from_meta_data (const struct GNUNET_CONTAINER_MetaData
438 /* ******************** command-line option parsing API *********************** */
441 * Command-line option parser function that allows the user
442 * to specify one or more '-k' options with keywords. Each
443 * specified keyword will be added to the URI. A pointer to
444 * the URI must be passed as the "scls" argument.
446 * @param ctx command line processor context
447 * @param scls must be of type "struct GNUNET_FS_Uri **"
448 * @param option name of the option (typically 'k')
449 * @param value command line argument given
450 * @return GNUNET_OK on success
453 GNUNET_FS_getopt_set_keywords (struct GNUNET_GETOPT_CommandLineProcessorContext
454 *ctx, void *scls, const char *option,
459 * Command-line option parser function that allows the user to specify
460 * one or more '-m' options with metadata. Each specified entry of
461 * the form "type=value" will be added to the metadata. A pointer to
462 * the metadata must be passed as the "scls" argument.
464 * @param ctx command line processor context
465 * @param scls must be of type "struct GNUNET_CONTAINER_MetaData **"
466 * @param option name of the option (typically 'k')
467 * @param value command line argument given
468 * @return GNUNET_OK on success
471 GNUNET_FS_getopt_set_metadata (struct GNUNET_GETOPT_CommandLineProcessorContext
472 *ctx, void *scls, const char *option,
477 /* ************************* sharing API ***************** */
481 * Possible status codes used in the callback for the
482 * various file-sharing operations. On each file (or search),
483 * the callback is guaranteed to be called once with "START"
484 * and once with STOPPED; calls with PROGRESS, ERROR or COMPLETED
485 * are optional and depend on the circumstances; parent operations
486 * will be STARTED before child-operations and STOPPED after
487 * their respective child-operations. START and STOP signals
488 * are typically generated either due to explicit client requests
489 * or because of suspend/resume operations.
491 enum GNUNET_FS_Status
494 * Notification that we have started to publish a file structure.
496 GNUNET_FS_STATUS_PUBLISH_START = 0,
499 * Notification that we have resumed sharing a file structure.
501 GNUNET_FS_STATUS_PUBLISH_RESUME = 1,
504 * Notification that we have suspended sharing a file structure.
506 GNUNET_FS_STATUS_PUBLISH_SUSPEND = 2,
509 * Notification that we are making progress sharing a file structure.
511 GNUNET_FS_STATUS_PUBLISH_PROGRESS = 3,
514 * Notification that an error was encountered sharing a file structure.
515 * The application will continue to receive resume/suspend events for
516 * this structure until "GNUNET_FS_publish_stop" is called.
518 GNUNET_FS_STATUS_PUBLISH_ERROR = 4,
521 * Notification that we completed sharing a file structure.
522 * The application will continue to receive resume/suspend events for
523 * this structure until "GNUNET_FS_publish_stop" is called.
525 GNUNET_FS_STATUS_PUBLISH_COMPLETED = 5,
528 * Notification that we have stopped
529 * the process of uploading a file structure; no
530 * futher events will be generated for this action.
532 GNUNET_FS_STATUS_PUBLISH_STOPPED = 6,
535 * Notification that we have started this download.
537 GNUNET_FS_STATUS_DOWNLOAD_START = 7,
540 * Notification that this download is being resumed.
542 GNUNET_FS_STATUS_DOWNLOAD_RESUME = 8,
545 * Notification that this download was suspended.
547 GNUNET_FS_STATUS_DOWNLOAD_SUSPEND = 9,
550 * Notification about progress with this download.
552 GNUNET_FS_STATUS_DOWNLOAD_PROGRESS = 10,
555 * Notification that this download encountered an error.
557 GNUNET_FS_STATUS_DOWNLOAD_ERROR = 11,
560 * Notification that this download completed. Note that for
561 * directories, completion does not imply completion of all files in
564 GNUNET_FS_STATUS_DOWNLOAD_COMPLETED = 12,
567 * Notification that this download was stopped
568 * (final event with respect to this action).
570 GNUNET_FS_STATUS_DOWNLOAD_STOPPED = 13,
573 * Notification that this download is now actively being
574 * pursued (as opposed to waiting in the queue).
576 GNUNET_FS_STATUS_DOWNLOAD_ACTIVE = 14,
579 * Notification that this download is no longer actively
580 * being pursued (back in the queue).
582 GNUNET_FS_STATUS_DOWNLOAD_INACTIVE = 15,
585 * Notification that this download is no longer part of a
586 * recursive download or search but now a 'stand-alone'
587 * download (and may thus need to be moved in the GUI
588 * into a different category).
590 GNUNET_FS_STATUS_DOWNLOAD_LOST_PARENT = 16,
593 * First event generated when a client requests
594 * a search to begin or when a namespace result
595 * automatically triggers the search for updates.
597 GNUNET_FS_STATUS_SEARCH_START = 17,
600 * Last event when a search is being resumed;
601 * note that "GNUNET_FS_SEARCH_START" will not
602 * be generated in this case.
604 GNUNET_FS_STATUS_SEARCH_RESUME = 18,
607 * Event generated for each search result
608 * when the respective search is resumed.
610 GNUNET_FS_STATUS_SEARCH_RESUME_RESULT = 19,
613 * Last event when a search is being suspended;
614 * note that "GNUNET_FS_SEARCH_STOPPED" will not
615 * be generated in this case.
617 GNUNET_FS_STATUS_SEARCH_SUSPEND = 20,
620 * This search has yielded a result.
622 GNUNET_FS_STATUS_SEARCH_RESULT = 21,
625 * We have discovered a new namespace.
627 GNUNET_FS_STATUS_SEARCH_RESULT_NAMESPACE = 22,
630 * We have additional data about the quality
631 * or availability of a search result.
633 GNUNET_FS_STATUS_SEARCH_UPDATE = 23,
636 * Signals a problem with this search.
638 GNUNET_FS_STATUS_SEARCH_ERROR = 24,
641 * Signals that this search was paused.
643 GNUNET_FS_STATUS_SEARCH_PAUSED = 25,
646 * Signals that this search was continued (unpaused).
648 GNUNET_FS_STATUS_SEARCH_CONTINUED = 26,
651 * Event generated for each search result
652 * when the respective search is stopped.
654 GNUNET_FS_STATUS_SEARCH_RESULT_STOPPED = 27,
657 * Event generated for each search result
658 * when the respective search is suspended.
660 GNUNET_FS_STATUS_SEARCH_RESULT_SUSPEND = 28,
663 * Last message from a search; this signals
664 * that there will be no further events associated
667 GNUNET_FS_STATUS_SEARCH_STOPPED = 29,
670 * Notification that we started to unindex a file.
672 GNUNET_FS_STATUS_UNINDEX_START = 30,
675 * Notification that we resumed unindexing of a file.
677 GNUNET_FS_STATUS_UNINDEX_RESUME = 31,
680 * Notification that we suspended unindexing a file.
682 GNUNET_FS_STATUS_UNINDEX_SUSPEND = 32,
685 * Notification that we made progress unindexing a file.
687 GNUNET_FS_STATUS_UNINDEX_PROGRESS = 33,
690 * Notification that we encountered an error unindexing
693 GNUNET_FS_STATUS_UNINDEX_ERROR = 34,
696 * Notification that the unindexing of this file
699 GNUNET_FS_STATUS_UNINDEX_COMPLETED = 35,
702 * Notification that the unindexing of this file
703 * was stopped (final event for this action).
705 GNUNET_FS_STATUS_UNINDEX_STOPPED = 36
710 * Handle for controlling an upload.
712 struct GNUNET_FS_PublishContext;
716 * Handle for controlling an unindexing operation.
718 struct GNUNET_FS_UnindexContext;
722 * Handle for controlling a search.
724 struct GNUNET_FS_SearchContext;
728 * Result from a search. Opaque handle to refer to the search
729 * (typically used when starting a download associated with the search
732 struct GNUNET_FS_SearchResult;
736 * Context for controlling a download.
738 struct GNUNET_FS_DownloadContext;
742 * Handle for detail information about a file that is being publishd.
743 * Specifies metadata, keywords, how to get the contents of the file
744 * (i.e. data-buffer in memory, filename on disk) and other options.
746 struct GNUNET_FS_FileInformation;
750 * Argument given to the progress callback with
751 * information about what is going on.
753 struct GNUNET_FS_ProgressInfo
757 * Values that depend on the event type.
763 * Values for all "GNUNET_FS_STATUS_PUBLISH_*" events.
769 * Context for controlling the upload.
771 struct GNUNET_FS_PublishContext *pc;
774 * Information about the file that is being publishd.
776 const struct GNUNET_FS_FileInformation *fi;
779 * Client context pointer (set the last time by the client for
780 * this operation; initially NULL on START/RESUME events).
785 * Client context pointer for the parent operation
786 * (if this is a file in a directory or a subdirectory).
791 * Name of the file being published; can be NULL.
793 const char *filename;
796 * How large is the file overall? For directories,
797 * this is only the size of the directory itself,
798 * not of the other files contained within the
804 * At what time do we expect to finish the upload?
805 * (will be a value in the past for completed
808 struct GNUNET_TIME_Relative eta;
811 * How long has this upload been actively running
812 * (excludes times where the upload was suspended).
814 struct GNUNET_TIME_Relative duration;
817 * How many bytes have we completed?
822 * What anonymity level is used for this upload?
827 * Additional values for specific events.
833 * These values are only valid for
834 * GNUNET_FS_STATUS_PUBLISH_PROGRESS events.
840 * Data block we just published.
845 * At what offset in the file is "data"?
850 * Length of the data block.
855 * Depth of the given block in the tree;
856 * 0 would be the lowest level (DBLOCKs).
863 * These values are only valid for
864 * GNUNET_FS_STATUS_PUBLISH_RESUME events.
870 * Error message, NULL if no error was encountered so far.
875 * URI of the file (if the download had been completed)
877 const struct GNUNET_FS_Uri *chk_uri;
882 * These values are only valid for
883 * GNUNET_FS_STATUS_PUBLISH_COMPLETED events.
891 const struct GNUNET_FS_Uri *chk_uri;
896 * These values are only valid for
897 * GNUNET_FS_STATUS_PUBLISH_ERROR events.
903 * Error message, never NULL.
915 * Values for all "GNUNET_FS_STATUS_DOWNLOAD_*" events.
921 * Context for controlling the download.
923 struct GNUNET_FS_DownloadContext *dc;
926 * Client context pointer (set the last time
927 * by the client for this operation; initially
928 * NULL on START/RESUME events).
933 * Client context pointer for the parent operation
934 * (if this is a file in a directory or a subdirectory).
939 * Client context pointer for the associated search operation
940 * (specifically, context pointer for the specific search
941 * result, not the overall search); only set if this
942 * download was started from a search result.
947 * URI used for this download.
949 const struct GNUNET_FS_Uri *uri;
952 * Name of the file that we are downloading.
954 const char *filename;
957 * How large is the download overall? This
958 * is NOT necessarily the size from the
959 * URI since we may be doing a partial download.
964 * At what time do we expect to finish the download?
965 * (will be a value in the past for completed
968 struct GNUNET_TIME_Relative eta;
971 * How long has this download been active?
973 struct GNUNET_TIME_Relative duration;
976 * How many bytes have we completed?
981 * What anonymity level is used for this download?
986 * Is the download currently active.
991 * Additional values for specific events.
997 * These values are only valid for
998 * GNUNET_FS_STATUS_DOWNLOAD_PROGRESS events.
1004 * Data block we just obtained, can be NULL (even if
1005 * data_len > 0) if we found the entire block 'intact' on
1006 * disk. In this case, it is also possible for 'data_len'
1007 * to be larger than an individual (32k) block.
1012 * At what offset in the file is "data"?
1017 * Length of the data block.
1022 * Depth of the given block in the tree;
1023 * 0 would be the lowest level (DBLOCKS).
1028 * How much trust did we offer for downloading this block?
1030 unsigned int trust_offered;
1033 * How much time passed between us asking for this block and
1034 * actually getting it? GNUNET_TIME_UNIT_FOREVER_REL if unknown.
1036 struct GNUNET_TIME_Relative block_download_duration;
1041 * These values are only valid for
1042 * GNUNET_FS_STATUS_DOWNLOAD_START events.
1048 * Known metadata for the download.
1050 const struct GNUNET_CONTAINER_MetaData *meta;
1055 * These values are only valid for
1056 * GNUNET_FS_STATUS_DOWNLOAD_RESUME events.
1062 * Known metadata for the download.
1064 const struct GNUNET_CONTAINER_MetaData *meta;
1067 * Error message, NULL if we have not encountered any error yet.
1069 const char *message;
1074 * These values are only valid for
1075 * GNUNET_FS_STATUS_DOWNLOAD_ERROR events.
1083 const char *message;
1092 * Values for all "GNUNET_FS_STATUS_SEARCH_*" events.
1098 * Context for controlling the search, NULL for
1099 * searches that were not explicitly triggered
1100 * by the client (i.e., searches for updates in
1103 struct GNUNET_FS_SearchContext *sc;
1106 * Client context pointer (set the last time by the client for
1107 * this operation; initially NULL on START/RESUME events). Note
1108 * that this value can only be set on START/RESUME; returning
1109 * non-NULL on RESULT/RESUME_RESULT will actually update the
1110 * private context for "UPDATE" events.
1115 * Client parent-context pointer; NULL for top-level searches,
1116 * refers to the client context of the associated search result
1117 * for automatically triggered searches for updates in
1118 * namespaces. In this case, 'presult' refers to that search
1124 * What query is used for this search
1125 * (list of keywords or SKS identifier).
1127 const struct GNUNET_FS_Uri *query;
1130 * How long has this search been actively running
1131 * (excludes times where the search was paused or
1134 struct GNUNET_TIME_Relative duration;
1137 * What anonymity level is used for this search?
1142 * Additional values for specific events.
1148 * These values are only valid for
1149 * GNUNET_FS_STATUS_SEARCH_RESULT events.
1155 * Metadata for the search result.
1157 const struct GNUNET_CONTAINER_MetaData *meta;
1160 * URI for the search result.
1162 const struct GNUNET_FS_Uri *uri;
1165 * Handle to the result (for starting downloads).
1167 struct GNUNET_FS_SearchResult *result;
1170 * Applicability rank (the larger, the better the result
1171 * fits the search criteria).
1173 uint32_t applicability_rank;
1178 * These values are only valid for
1179 * GNUNET_FS_STATUS_SEARCH_RESUME_RESULT events.
1185 * Metadata for the search result.
1187 const struct GNUNET_CONTAINER_MetaData *meta;
1190 * URI for the search result.
1192 const struct GNUNET_FS_Uri *uri;
1195 * Handle to the result (for starting downloads).
1197 struct GNUNET_FS_SearchResult *result;
1200 * Current availability rank (negative:
1201 * unavailable, positive: available)
1203 int32_t availability_rank;
1206 * On how many total queries is the given
1207 * availability_rank based?
1209 uint32_t availability_certainty;
1212 * Updated applicability rank (the larger,
1213 * the better the result fits the search
1216 uint32_t applicability_rank;
1221 * These values are only valid for
1222 * GNUNET_FS_STATUS_SEARCH_UPDATE events.
1228 * Private context set for for this result
1229 * during the "RESULT" event.
1234 * Metadata for the search result.
1236 const struct GNUNET_CONTAINER_MetaData *meta;
1239 * URI for the search result.
1241 const struct GNUNET_FS_Uri *uri;
1244 * Current availability rank (negative:
1245 * unavailable, positive: available)
1247 int32_t availability_rank;
1250 * On how many total queries is the given
1251 * availability_rank based?
1253 uint32_t availability_certainty;
1256 * Updated applicability rank (the larger,
1257 * the better the result fits the search
1260 uint32_t applicability_rank;
1265 * These values are only valid for
1266 * GNUNET_FS_STATUS_SEARCH_RESULT_SUSPEND events.
1267 * These events are automatically triggered for
1268 * each search result before the
1269 * GNUNET_FS_STATUS_SEARCH_SUSPEND event. This
1270 * happens primarily to give the client a chance
1271 * to clean up the "cctx" (if needed).
1277 * Private context set for for this result
1278 * during the "RESULT" event.
1283 * Metadata for the search result.
1285 const struct GNUNET_CONTAINER_MetaData *meta;
1288 * URI for the search result.
1290 const struct GNUNET_FS_Uri *uri;
1295 * These values are only valid for
1296 * GNUNET_FS_STATUS_SEARCH_RESULT_STOPPED events.
1297 * These events are automatically triggered for
1298 * each search result before the
1299 * GNUNET_FS_STATUS_SEARCH_STOPPED event. This
1300 * happens primarily to give the client a chance
1301 * to clean up the "cctx" (if needed).
1307 * Private context set for for this result
1308 * during the "RESULT" event.
1313 * Metadata for the search result.
1315 const struct GNUNET_CONTAINER_MetaData *meta;
1318 * URI for the search result.
1320 const struct GNUNET_FS_Uri *uri;
1325 * These values are only valid for
1326 * GNUNET_FS_STATUS_SEARCH_RESUME events.
1332 * Error message, NULL if we have not encountered any error yet.
1334 const char *message;
1337 * Is this search currently paused?
1344 * These values are only valid for
1345 * GNUNET_FS_STATUS_SEARCH_ERROR events.
1353 const char *message;
1358 * Values for all "GNUNET_FS_STATUS_SEARCH_RESULT_NAMESPACE" events.
1364 * Handle to the namespace (NULL if it is not a local
1367 struct GNUNET_FS_Namespace *ns;
1370 * Short, human-readable name of the namespace.
1375 * Root identifier for the namespace, can be NULL.
1380 * Metadata for the namespace.
1382 const struct GNUNET_CONTAINER_MetaData *meta;
1385 * Hash-identifier for the namespace.
1396 * Values for all "GNUNET_FS_STATUS_UNINDEX_*" events.
1402 * Context for controlling the unindexing.
1404 struct GNUNET_FS_UnindexContext *uc;
1407 * Client context pointer (set the last time
1408 * by the client for this operation; initially
1409 * NULL on START/RESUME events).
1414 * Name of the file that is being unindexed.
1416 const char *filename;
1419 * How large is the file overall?
1424 * At what time do we expect to finish unindexing?
1425 * (will be a value in the past for completed
1426 * unindexing opeations).
1428 struct GNUNET_TIME_Relative eta;
1431 * How long has this upload been actively running
1432 * (excludes times where the upload was suspended).
1434 struct GNUNET_TIME_Relative duration;
1437 * How many bytes have we completed?
1442 * Additional values for specific events.
1448 * These values are only valid for
1449 * GNUNET_FS_STATUS_UNINDEX_PROGRESS events.
1455 * Data block we just unindexed.
1460 * At what offset in the file is "data"?
1465 * Length of the data block.
1470 * Depth of the given block in the tree;
1471 * 0 would be the lowest level (DBLOCKS).
1478 * These values are only valid for
1479 * GNUNET_FS_STATUS_UNINDEX_RESUME events.
1485 * Error message, NULL if we have not encountered any error yet.
1487 const char *message;
1492 * These values are only valid for
1493 * GNUNET_FS_STATUS_UNINDEX_ERROR events.
1501 const char *message;
1512 * Specific status code (determines the event type).
1514 enum GNUNET_FS_Status status;
1520 * Notification of FS to a client about the progress of an
1521 * operation. Callbacks of this type will be used for uploads,
1522 * downloads and searches. Some of the arguments depend a bit
1523 * in their meaning on the context in which the callback is used.
1525 * @param cls closure
1526 * @param info details about the event, specifying the event type
1527 * and various bits about the event
1528 * @return client-context (for the next progress call
1529 * for this operation; should be set to NULL for
1530 * SUSPEND and STOPPED events). The value returned
1531 * will be passed to future callbacks in the respective
1532 * field in the GNUNET_FS_ProgressInfo struct.
1534 typedef void *(*GNUNET_FS_ProgressCallback) (void *cls,
1535 const struct GNUNET_FS_ProgressInfo
1540 * General (global) option flags for file-sharing.
1542 enum GNUNET_FS_Flags
1545 * No special flags set.
1547 GNUNET_FS_FLAGS_NONE = 0,
1550 * Is persistence of operations desired?
1551 * (will create SUSPEND/RESUME events).
1553 GNUNET_FS_FLAGS_PERSISTENCE = 1,
1556 * Should we automatically trigger probes for search results
1557 * to determine availability?
1558 * (will create GNUNET_FS_STATUS_SEARCH_UPDATE events).
1560 GNUNET_FS_FLAGS_DO_PROBES = 2
1564 * Options specified in the VARARGs portion of GNUNET_FS_start.
1566 enum GNUNET_FS_OPTIONS
1570 * Last option in the VARARG list.
1572 GNUNET_FS_OPTIONS_END = 0,
1575 * Select the desired amount of parallelism (this option should be
1576 * followed by an "unsigned int" giving the desired maximum number
1577 * of parallel downloads).
1579 GNUNET_FS_OPTIONS_DOWNLOAD_PARALLELISM = 1,
1582 * Maximum number of requests that should be pending at a given
1583 * point in time (invidivual downloads may go above this, but
1584 * if we are above this threshold, we should not activate any
1585 * additional downloads.
1587 GNUNET_FS_OPTIONS_REQUEST_PARALLELISM = 2
1592 * Settings for publishing a block (which may of course also
1593 * apply to an entire directory or file).
1595 struct GNUNET_FS_BlockOptions
1599 * At what time should the block expire? Data blocks (DBLOCKS and
1600 * IBLOCKS) may still be used even if they are expired (however,
1601 * they'd be removed quickly from the datastore if we are short on
1602 * space), all other types of blocks will no longer be returned
1603 * after they expire.
1605 struct GNUNET_TIME_Absolute expiration_time;
1608 * At which anonymity level should the block be shared?
1609 * (0: no anonymity, 1: normal GAP, >1: with cover traffic).
1611 uint32_t anonymity_level;
1614 * How important is it for us to store the block? If we run
1615 * out of space, the highest-priority, non-expired blocks will
1618 uint32_t content_priority;
1621 * How often should we try to migrate the block to other peers?
1622 * Only used if "CONTENT_PUSHING" is set to YES, in which case we
1623 * first push each block to other peers according to their
1624 * replication levels. Once each block has been pushed that many
1625 * times to other peers, blocks are chosen for migration at random.
1626 * Naturally, there is no guarantee that the other peers will keep
1627 * these blocks for any period of time (since they won't have any
1628 * priority or might be too busy to even store the block in the
1631 uint32_t replication_level;
1637 * Return the current year (i.e. '2011').
1640 GNUNET_FS_get_current_year (void);
1644 * Convert a year to an expiration time of January 1st of that year.
1646 * @param year a year (after 1970, please ;-)).
1647 * @return absolute time for January 1st of that year.
1649 struct GNUNET_TIME_Absolute
1650 GNUNET_FS_year_to_time (unsigned int year);
1654 * Convert an expiration time to the respective year (rounds)
1656 * @param at absolute time
1657 * @return year a year (after 1970), 0 on error
1660 GNUNET_FS_time_to_year (struct GNUNET_TIME_Absolute at);
1664 * Handle to the file-sharing service.
1666 struct GNUNET_FS_Handle;
1670 * Setup a connection to the file-sharing service.
1672 * @param cfg configuration to use
1673 * @param client_name unique identifier for this client
1674 * @param upcb function to call to notify about FS actions
1675 * @param upcb_cls closure for upcb
1676 * @param flags specific attributes for fs-operations
1677 * @param ... list of optional options, terminated with GNUNET_FS_OPTIONS_END
1678 * @return NULL on error
1680 struct GNUNET_FS_Handle *
1681 GNUNET_FS_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
1682 const char *client_name, GNUNET_FS_ProgressCallback upcb,
1683 void *upcb_cls, enum GNUNET_FS_Flags flags, ...);
1687 * Close our connection with the file-sharing service.
1688 * The callback given to GNUNET_FS_start will no longer be
1689 * called after this function returns.
1691 * @param h handle that was returned from GNUNET_FS_start
1694 GNUNET_FS_stop (struct GNUNET_FS_Handle *h);
1698 * Extract meta-data from a file.
1700 * @param md metadata to set
1701 * @param filename name of file to inspect
1702 * @param extractors plugins to use
1703 * @return GNUNET_SYSERR on error, otherwise the number
1704 * of meta-data items obtained
1707 GNUNET_FS_meta_data_extract_from_file (struct GNUNET_CONTAINER_MetaData *md,
1708 const char *filename,
1709 struct EXTRACTOR_PluginList *extractors);
1713 * Function called on entries in a GNUNET_FS_FileInformation publish-structure.
1715 * @param cls closure
1716 * @param fi the entry in the publish-structure
1717 * @param length length of the file or directory
1718 * @param meta metadata for the file or directory (can be modified)
1719 * @param uri pointer to the keywords that will be used for this entry (can be modified)
1720 * @param bo block options (can be modified)
1721 * @param do_index should we index (can be modified)
1722 * @param client_info pointer to client context set upon creation (can be modified)
1723 * @return GNUNET_OK to continue, GNUNET_NO to remove
1724 * this entry from the directory, GNUNET_SYSERR
1725 * to abort the iteration
1727 typedef int (*GNUNET_FS_FileInformationProcessor) (void *cls,
1729 GNUNET_FS_FileInformation *
1730 fi, uint64_t length,
1732 GNUNET_CONTAINER_MetaData *
1734 struct GNUNET_FS_Uri ** uri,
1735 struct GNUNET_FS_BlockOptions
1736 * bo, int *do_index,
1737 void **client_info);
1741 * Obtain the name under which this file information
1742 * structure is stored on disk. Only works for top-level
1743 * file information structures.
1745 * @param s structure to get the filename for
1746 * @return NULL on error, otherwise filename that
1747 * can be passed to "GNUNET_FS_file_information_recover"
1748 * to read this fi-struct from disk.
1751 GNUNET_FS_file_information_get_id (struct GNUNET_FS_FileInformation *s);
1755 * Obtain the filename from the file information structure.
1757 * @param s structure to get the filename for
1758 * @return "filename" field of the structure (can be NULL)
1761 GNUNET_FS_file_information_get_filename (struct GNUNET_FS_FileInformation *s);
1764 * Set the filename in the file information structure.
1765 * If filename was already set, frees it before setting the new one.
1766 * Makes a copy of the argument.
1768 * @param s structure to get the filename for
1769 * @param filename filename to set
1772 GNUNET_FS_file_information_set_filename (struct GNUNET_FS_FileInformation *s,
1773 const char *filename);
1776 * Create an entry for a file in a publish-structure.
1778 * @param h handle to the file sharing subsystem
1779 * @param client_info initial client-info value for this entry
1780 * @param filename name of the file or directory to publish
1781 * @param keywords under which keywords should this file be available
1782 * directly; can be NULL
1783 * @param meta metadata for the file
1784 * @param do_index GNUNET_YES for index, GNUNET_NO for insertion,
1785 * GNUNET_SYSERR for simulation
1786 * @param bo block options
1787 * @return publish structure entry for the file
1789 struct GNUNET_FS_FileInformation *
1790 GNUNET_FS_file_information_create_from_file (struct GNUNET_FS_Handle *h,
1792 const char *filename,
1793 const struct GNUNET_FS_Uri
1796 GNUNET_CONTAINER_MetaData *meta,
1798 const struct GNUNET_FS_BlockOptions
1803 * Create an entry for a file in a publish-structure.
1805 * @param h handle to the file sharing subsystem
1806 * @param client_info initial client-info value for this entry
1807 * @param length length of the file
1808 * @param data data for the file (should not be used afterwards by
1809 * the caller; callee will "free")
1810 * @param keywords under which keywords should this file be available
1811 * directly; can be NULL
1812 * @param meta metadata for the file
1813 * @param do_index GNUNET_YES for index, GNUNET_NO for insertion,
1814 * GNUNET_SYSERR for simulation
1815 * @param bo block options
1816 * @return publish structure entry for the file
1818 struct GNUNET_FS_FileInformation *
1819 GNUNET_FS_file_information_create_from_data (struct GNUNET_FS_Handle *h,
1820 void *client_info, uint64_t length,
1822 const struct GNUNET_FS_Uri
1825 GNUNET_CONTAINER_MetaData *meta,
1827 const struct GNUNET_FS_BlockOptions
1832 * Function that provides data.
1834 * @param cls closure
1835 * @param offset offset to read from; it is possible
1836 * that the caller might need to go backwards
1838 * @param max maximum number of bytes that should be
1839 * copied to buf; readers are not allowed
1840 * to provide less data unless there is an error;
1841 * a value of "0" will be used at the end to allow
1842 * the reader to clean up its internal state
1843 * @param buf where the reader should write the data
1844 * @param emsg location for the reader to store an error message
1845 * @return number of bytes written, usually "max", 0 on error
1847 typedef size_t (*GNUNET_FS_DataReader) (void *cls, uint64_t offset, size_t max,
1848 void *buf, char **emsg);
1852 * Create an entry for a file in a publish-structure.
1854 * @param h handle to the file sharing subsystem
1855 * @param client_info initial client-info value for this entry
1856 * @param length length of the file
1857 * @param reader function that can be used to obtain the data for the file
1858 * @param reader_cls closure for "reader"
1859 * @param keywords under which keywords should this file be available
1860 * directly; can be NULL
1861 * @param meta metadata for the file
1862 * @param do_index GNUNET_YES for index, GNUNET_NO for insertion,
1863 * GNUNET_SYSERR for simulation
1864 * @param bo block options
1865 * @return publish structure entry for the file
1867 struct GNUNET_FS_FileInformation *
1868 GNUNET_FS_file_information_create_from_reader (struct GNUNET_FS_Handle *h,
1871 GNUNET_FS_DataReader reader,
1873 const struct GNUNET_FS_Uri
1876 GNUNET_CONTAINER_MetaData *meta,
1879 GNUNET_FS_BlockOptions *bo);
1883 * Function that a "GNUNET_FS_DirectoryScanner" should call
1884 * for each entry in the directory.
1886 * @param cls closure
1887 * @param filename name of the file (including path); must end
1888 * in a "/" (even on W32) if this is a directory
1889 * @param fi information about the file (should not be
1890 * used henceforth by the caller)
1892 typedef void (*GNUNET_FS_FileProcessor) (void *cls, const char *filename,
1893 struct GNUNET_FS_FileInformation * fi);
1897 * Type of a function that will be used to scan a directory.
1899 * @param cls closure
1900 * @param h handle to the file sharing subsystem
1901 * @param dirname name of the directory to scan
1902 * @param do_index should files be indexed or inserted
1903 * @param bo block options
1904 * @param proc function to call on each entry
1905 * @param proc_cls closure for proc
1906 * @param emsg where to store an error message (on errors)
1907 * @return GNUNET_OK on success
1909 typedef int (*GNUNET_FS_DirectoryScanner) (void *cls,
1910 struct GNUNET_FS_Handle * h,
1911 const char *dirname, int do_index,
1912 const struct GNUNET_FS_BlockOptions *
1913 bo, GNUNET_FS_FileProcessor proc,
1914 void *proc_cls, char **emsg);
1919 * Simple, useful default implementation of a directory scanner
1920 * (GNUNET_FS_DirectoryScanner). This implementation expects to get a
1921 * UNIX filename, will publish all files in the directory except hidden
1922 * files (those starting with a "."). Metadata will be extracted
1923 * using GNU libextractor; the specific list of plugins should be
1924 * specified in "cls", passing NULL will disable (!) metadata
1925 * extraction. Keywords will be derived from the metadata and
1926 * associated with directories as appropriate. This is strictly a
1927 * convenience function (however, if all tools use it, there will
1928 * be less of a chance of distinguishing users by the specific
1929 * user-interface they were using).
1931 * @param cls must be of type "struct EXTRACTOR_Extractor*"
1932 * @param h handle to the file sharing subsystem
1933 * @param dirname name of the directory to scan
1934 * @param do_index should files be indexed or inserted
1935 * @param bo block options
1936 * @param proc function called on each entry
1937 * @param proc_cls closure for proc
1938 * @param emsg where to store an error message (on errors)
1939 * @return GNUNET_OK on success
1942 GNUNET_FS_directory_scanner_default (void *cls, struct GNUNET_FS_Handle *h,
1943 const char *dirname, int do_index,
1944 const struct GNUNET_FS_BlockOptions *bo,
1945 GNUNET_FS_FileProcessor proc,
1946 void *proc_cls, char **emsg);
1950 * Create a publish-structure from an existing file hierarchy, inferring
1951 * and organizing keywords and metadata as much as possible. This
1952 * function primarily performs the recursive build and re-organizes
1953 * keywords and metadata; for automatically getting metadata
1954 * extraction, scanning of directories and creation of the respective
1955 * GNUNET_FS_FileInformation entries the default scanner should be
1956 * passed (GNUNET_FS_directory_scanner_default). This is strictly a
1957 * convenience function.
1959 * @param h handle to the file sharing subsystem
1960 * @param client_info initial client-info value for this entry
1961 * @param filename name of the top-level file or directory
1962 * @param scanner function used to get a list of files in a directory
1963 * @param scanner_cls closure for scanner
1964 * @param do_index should files in the hierarchy be indexed?
1965 * @param bo block options
1966 * @param emsg where to store an error message
1967 * @return publish structure entry for the directory, NULL on error
1969 struct GNUNET_FS_FileInformation *
1970 GNUNET_FS_file_information_create_from_directory (struct GNUNET_FS_Handle *h,
1972 const char *filename,
1973 GNUNET_FS_DirectoryScanner
1974 scanner, void *scanner_cls,
1977 GNUNET_FS_BlockOptions *bo,
1982 * Create an entry for an empty directory in a publish-structure.
1983 * This function should be used by applications for which the
1984 * use of "GNUNET_FS_file_information_create_from_directory"
1985 * is not appropriate.
1987 * @param h handle to the file sharing subsystem
1988 * @param client_info initial client-info value for this entry
1989 * @param keywords under which keywords should this directory be available
1990 * directly; can be NULL
1991 * @param meta metadata for the directory
1992 * @param bo block options
1993 * @param filename name of the directory; can be NULL
1994 * @return publish structure entry for the directory , NULL on error
1996 struct GNUNET_FS_FileInformation *
1997 GNUNET_FS_file_information_create_empty_directory (struct GNUNET_FS_Handle *h,
1999 const struct GNUNET_FS_Uri
2002 GNUNET_CONTAINER_MetaData
2005 GNUNET_FS_BlockOptions *bo,
2006 const char *filename);
2010 * Test if a given entry represents a directory.
2012 * @param ent check if this FI represents a directory
2013 * @return GNUNET_YES if so, GNUNET_NO if not
2016 GNUNET_FS_file_information_is_directory (const struct GNUNET_FS_FileInformation
2021 * Add an entry to a directory in a publish-structure. Clients
2022 * should never modify publish structures that were passed to
2023 * "GNUNET_FS_publish_start" already.
2025 * @param dir the directory
2026 * @param ent the entry to add; the entry must not have been
2027 * added to any other directory at this point and
2028 * must not include "dir" in its structure
2029 * @return GNUNET_OK on success, GNUNET_SYSERR on error
2032 GNUNET_FS_file_information_add (struct GNUNET_FS_FileInformation *dir,
2033 struct GNUNET_FS_FileInformation *ent);
2037 * Inspect a file or directory in a publish-structure. Clients
2038 * should never modify publish structures that were passed to
2039 * "GNUNET_FS_publish_start" already. When called on a directory,
2040 * this function will FIRST call "proc" with information about
2041 * the directory itself and then for each of the files in the
2042 * directory (but not for files in subdirectories). When called
2043 * on a file, "proc" will be called exactly once (with information
2044 * about the specific file).
2046 * @param dir the directory
2047 * @param proc function to call on each entry
2048 * @param proc_cls closure for proc
2051 GNUNET_FS_file_information_inspect (struct GNUNET_FS_FileInformation *dir,
2052 GNUNET_FS_FileInformationProcessor proc,
2057 * Destroy publish-structure. Clients should never destroy publish
2058 * structures that were passed to "GNUNET_FS_publish_start" already.
2060 * @param fi structure to destroy
2061 * @param cleaner function to call on each entry in the structure
2062 * (useful to clean up client_info); can be NULL; return
2063 * values are ignored
2064 * @param cleaner_cls closure for cleaner
2067 GNUNET_FS_file_information_destroy (struct GNUNET_FS_FileInformation *fi,
2068 GNUNET_FS_FileInformationProcessor cleaner,
2073 * Options for publishing. Compatible options
2074 * can be OR'ed together.
2076 enum GNUNET_FS_PublishOptions
2079 * No options (use defaults for everything).
2081 GNUNET_FS_PUBLISH_OPTION_NONE = 0,
2084 * Simulate publishing. With this option, no data will be stored
2085 * in the datastore. Useful for computing URIs from files.
2087 GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY = 1
2091 * Publish a file or directory.
2093 * @param h handle to the file sharing subsystem
2094 * @param fi information about the file or directory structure to publish
2095 * @param namespace namespace to publish the file in, NULL for no namespace
2096 * @param nid identifier to use for the publishd content in the namespace
2097 * (can be NULL, must be NULL if namespace is NULL)
2098 * @param nuid update-identifier that will be used for future updates
2099 * (can be NULL, must be NULL if namespace or nid is NULL)
2100 * @param options options for the publication
2101 * @return context that can be used to control the publish operation
2103 struct GNUNET_FS_PublishContext *
2104 GNUNET_FS_publish_start (struct GNUNET_FS_Handle *h,
2105 struct GNUNET_FS_FileInformation *fi,
2106 struct GNUNET_FS_Namespace *namespace, const char *nid,
2108 enum GNUNET_FS_PublishOptions options);
2112 * Stop a publication. Will abort incomplete publications (but
2113 * not remove blocks that have already been published) or
2114 * simply clean up the state for completed publications.
2115 * Must NOT be called from within the event callback!
2117 * @param pc context for the publication to stop
2120 GNUNET_FS_publish_stop (struct GNUNET_FS_PublishContext *pc);
2124 * Signature of a function called as the continuation of a KBlock or
2125 * SBlock publication.
2127 * @param cls closure
2128 * @param uri URI under which the block is now available, NULL on error
2129 * @param emsg error message, NULL on success
2131 typedef void (*GNUNET_FS_PublishContinuation) (void *cls,
2132 const struct GNUNET_FS_Uri * uri,
2137 * Publish a KBlock on GNUnet.
2139 * @param h handle to the file sharing subsystem
2140 * @param ksk_uri keywords to use
2141 * @param meta metadata to use
2142 * @param uri URI to refer to in the KBlock
2143 * @param bo block options
2144 * @param options publication options
2145 * @param cont continuation
2146 * @param cont_cls closure for cont
2149 GNUNET_FS_publish_ksk (struct GNUNET_FS_Handle *h,
2150 const struct GNUNET_FS_Uri *ksk_uri,
2151 const struct GNUNET_CONTAINER_MetaData *meta,
2152 const struct GNUNET_FS_Uri *uri,
2153 const struct GNUNET_FS_BlockOptions *bo,
2154 enum GNUNET_FS_PublishOptions options,
2155 GNUNET_FS_PublishContinuation cont, void *cont_cls);
2159 * Publish an SBlock on GNUnet.
2161 * @param h handle to the file sharing subsystem
2162 * @param namespace namespace to publish in
2163 * @param identifier identifier to use
2164 * @param update update identifier to use
2165 * @param meta metadata to use
2166 * @param uri URI to refer to in the SBlock
2167 * @param bo block options
2168 * @param options publication options
2169 * @param cont continuation
2170 * @param cont_cls closure for cont
2173 GNUNET_FS_publish_sks (struct GNUNET_FS_Handle *h,
2174 struct GNUNET_FS_Namespace *namespace,
2175 const char *identifier, const char *update,
2176 const struct GNUNET_CONTAINER_MetaData *meta,
2177 const struct GNUNET_FS_Uri *uri,
2178 const struct GNUNET_FS_BlockOptions *bo,
2179 enum GNUNET_FS_PublishOptions options,
2180 GNUNET_FS_PublishContinuation cont, void *cont_cls);
2184 * Type of a function called by "GNUNET_FS_get_indexed_files".
2186 * @param cls closure
2187 * @param filename the name of the file
2188 * @param file_id hash of the contents of the indexed file
2189 * @return GNUNET_OK to continue iteration, GNUNET_SYSERR to abort
2191 typedef int (*GNUNET_FS_IndexedFileProcessor) (void *cls, const char *filename,
2192 const GNUNET_HashCode * file_id);
2196 * Iterate over all indexed files.
2198 * @param h handle to the file sharing subsystem
2199 * @param iterator function to call on each indexed file
2200 * @param iterator_cls closure for iterator
2201 * @param cont continuation to call when done;
2202 * reason should be "TIMEOUT" (on
2203 * error) or "PREREQ_DONE" (on success)
2204 * @param cont_cls closure for cont
2207 GNUNET_FS_get_indexed_files (struct GNUNET_FS_Handle *h,
2208 GNUNET_FS_IndexedFileProcessor iterator,
2209 void *iterator_cls, GNUNET_SCHEDULER_Task cont,
2216 * @param h handle to the file sharing subsystem
2217 * @param filename file to unindex
2218 * @param cctx initial value for the client context
2219 * @return NULL on error, otherwise handle
2221 struct GNUNET_FS_UnindexContext *
2222 GNUNET_FS_unindex_start (struct GNUNET_FS_Handle *h, const char *filename,
2227 * Clean up after completion of an unindex operation.
2232 GNUNET_FS_unindex_stop (struct GNUNET_FS_UnindexContext *uc);
2236 * Publish an advertismement for a namespace.
2238 * @param h handle to the file sharing subsystem
2239 * @param ksk_uri keywords to use for advertisment
2240 * @param namespace handle for the namespace that should be advertised
2241 * @param meta meta-data for the namespace advertisement
2242 * @param bo block options
2243 * @param rootEntry name of the root of the namespace
2244 * @param cont continuation
2245 * @param cont_cls closure for cont
2248 GNUNET_FS_namespace_advertise (struct GNUNET_FS_Handle *h,
2249 struct GNUNET_FS_Uri *ksk_uri,
2250 struct GNUNET_FS_Namespace *namespace,
2251 const struct GNUNET_CONTAINER_MetaData *meta,
2252 const struct GNUNET_FS_BlockOptions *bo,
2253 const char *rootEntry,
2254 GNUNET_FS_PublishContinuation cont,
2259 * Create a namespace with the given name; if one already
2260 * exists, return a handle to the existing namespace.
2262 * @param h handle to the file sharing subsystem
2263 * @param name name to use for the namespace
2264 * @return handle to the namespace, NULL on error
2266 struct GNUNET_FS_Namespace *
2267 GNUNET_FS_namespace_create (struct GNUNET_FS_Handle *h, const char *name);
2271 * Delete a namespace handle. Can be used for a clean shutdown (free
2272 * memory) or also to freeze the namespace to prevent further
2273 * insertions by anyone.
2275 * @param namespace handle to the namespace that should be deleted / freed
2276 * @param freeze prevents future insertions; creating a namespace
2277 * with the same name again will create a fresh namespace instead
2279 * @return GNUNET_OK on success, GNUNET_SYSERR on error
2282 GNUNET_FS_namespace_delete (struct GNUNET_FS_Namespace *namespace, int freeze);
2286 * Callback with information about local (!) namespaces.
2287 * Contains the names of the local namespace and the global
2290 * @param cls closure
2291 * @param name human-readable identifier of the namespace
2292 * @param id hash identifier for the namespace
2294 typedef void (*GNUNET_FS_NamespaceInfoProcessor) (void *cls, const char *name,
2295 const GNUNET_HashCode * id);
2299 * Build a list of all available local (!) namespaces The returned
2300 * names are only the nicknames since we only iterate over the local
2303 * @param h handle to the file sharing subsystem
2304 * @param cb function to call on each known namespace
2305 * @param cb_cls closure for cb
2308 GNUNET_FS_namespace_list (struct GNUNET_FS_Handle *h,
2309 GNUNET_FS_NamespaceInfoProcessor cb, void *cb_cls);
2313 * Function called on updateable identifiers.
2315 * @param cls closure
2316 * @param last_id last identifier
2317 * @param last_uri uri used for the content published under the last_id
2318 * @param last_meta metadata associated with last_uri
2319 * @param next_id identifier that should be used for updates
2321 typedef void (*GNUNET_FS_IdentifierProcessor) (void *cls, const char *last_id,
2322 const struct GNUNET_FS_Uri *
2325 GNUNET_CONTAINER_MetaData *
2326 last_meta, const char *next_id);
2330 * List all of the identifiers in the namespace for which we could
2331 * produce an update. Namespace updates form a graph where each node
2332 * has a name. Each node can have any number of URI/meta-data entries
2333 * which can each be linked to other nodes. Cycles are possible.
2335 * Calling this function with "next_id" NULL will cause the library to
2336 * call "ip" with a root for each strongly connected component of the
2337 * graph (a root being a node from which all other nodes in the Scc
2340 * Calling this function with "next_id" being the name of a node will
2341 * cause the library to call "ip" with all children of the node. Note
2342 * that cycles within an SCC are possible (including self-loops).
2344 * @param namespace namespace to inspect for updateable content
2345 * @param next_id ID to look for; use NULL to look for SCC roots
2346 * @param ip function to call on each updateable identifier
2347 * @param ip_cls closure for ip
2350 GNUNET_FS_namespace_list_updateable (struct GNUNET_FS_Namespace *namespace,
2351 const char *next_id,
2352 GNUNET_FS_IdentifierProcessor ip,
2357 * Options for searching. Compatible options
2358 * can be OR'ed together.
2360 enum GNUNET_FS_SearchOptions
2363 * No options (use defaults for everything).
2365 GNUNET_FS_SEARCH_OPTION_NONE = 0,
2368 * Only search the local host, do not search remote systems (no P2P)
2370 GNUNET_FS_SEARCH_OPTION_LOOPBACK_ONLY = 1
2375 * Start search for content.
2377 * @param h handle to the file sharing subsystem
2378 * @param uri specifies the search parameters; can be
2379 * a KSK URI or an SKS URI.
2380 * @param anonymity desired level of anonymity
2381 * @param options options for the search
2382 * @param cctx initial value for the client context
2383 * @return context that can be used to control the search
2385 struct GNUNET_FS_SearchContext *
2386 GNUNET_FS_search_start (struct GNUNET_FS_Handle *h,
2387 const struct GNUNET_FS_Uri *uri, uint32_t anonymity,
2388 enum GNUNET_FS_SearchOptions options, void *cctx);
2394 * @param sc context for the search that should be paused
2397 GNUNET_FS_search_pause (struct GNUNET_FS_SearchContext *sc);
2401 * Continue paused search.
2403 * @param sc context for the search that should be resumed
2406 GNUNET_FS_search_continue (struct GNUNET_FS_SearchContext *sc);
2410 * Stop search for content.
2412 * @param sc context for the search that should be stopped
2415 GNUNET_FS_search_stop (struct GNUNET_FS_SearchContext *sc);
2421 * Options for downloading. Compatible options
2422 * can be OR'ed together.
2424 enum GNUNET_FS_DownloadOptions
2427 * No options (use defaults for everything).
2429 GNUNET_FS_DOWNLOAD_OPTION_NONE = 0,
2432 * Only download from the local host, do not access remote systems (no P2P)
2434 GNUNET_FS_DOWNLOAD_OPTION_LOOPBACK_ONLY = 1,
2437 * Do a recursive download (that is, automatically trigger the
2438 * download of files in directories).
2440 GNUNET_FS_DOWNLOAD_OPTION_RECURSIVE = 2,
2443 * Do not append temporary data to
2444 * the target file (for the IBlocks).
2446 GNUNET_FS_DOWNLOAD_NO_TEMPORARIES = 4,
2449 * Internal option used to flag this download as a 'probe' for a
2450 * search result. Impacts the priority with which the download is
2451 * run and causes signalling callbacks to be done differently.
2452 * Also, probe downloads are not serialized on suspension. Normal
2453 * clients should not use this!
2455 GNUNET_FS_DOWNLOAD_IS_PROBE = (1 << 31)
2461 * Download parts of a file. Note that this will store
2462 * the blocks at the respective offset in the given file. Also, the
2463 * download is still using the blocking of the underlying FS
2464 * encoding. As a result, the download may *write* outside of the
2465 * given boundaries (if offset and length do not match the 32k FS
2466 * block boundaries). <p>
2468 * The given range can be used to focus a download towards a
2469 * particular portion of the file (optimization), not to strictly
2470 * limit the download to exactly those bytes.
2472 * @param h handle to the file sharing subsystem
2473 * @param uri the URI of the file (determines what to download); CHK or LOC URI
2474 * @param meta known metadata for the file (can be NULL)
2475 * @param filename where to store the file, maybe NULL (then no file is
2476 * created on disk and data must be grabbed from the callbacks)
2477 * @param tempname where to store temporary file data, not used if filename is non-NULL;
2478 * can be NULL (in which case we will pick a name if needed); the temporary file
2479 * may already exist, in which case we will try to use the data that is there and
2480 * if it is not what is desired, will overwrite it
2481 * @param offset at what offset should we start the download (typically 0)
2482 * @param length how many bytes should be downloaded starting at offset
2483 * @param anonymity anonymity level to use for the download
2484 * @param options various download options
2485 * @param cctx initial value for the client context for this download
2486 * @param parent parent download to associate this download with (use NULL
2487 * for top-level downloads; useful for manually-triggered recursive downloads)
2488 * @return context that can be used to control this download
2490 struct GNUNET_FS_DownloadContext *
2491 GNUNET_FS_download_start (struct GNUNET_FS_Handle *h,
2492 const struct GNUNET_FS_Uri *uri,
2493 const struct GNUNET_CONTAINER_MetaData *meta,
2494 const char *filename, const char *tempname,
2495 uint64_t offset, uint64_t length, uint32_t anonymity,
2496 enum GNUNET_FS_DownloadOptions options, void *cctx,
2497 struct GNUNET_FS_DownloadContext *parent);
2501 * Download parts of a file based on a search result. The download
2502 * will be associated with the search result (and the association
2503 * will be preserved when serializing/deserializing the state).
2504 * If the search is stopped, the download will not be aborted but
2505 * be 'promoted' to a stand-alone download.
2507 * As with the other download function, this will store
2508 * the blocks at the respective offset in the given file. Also, the
2509 * download is still using the blocking of the underlying FS
2510 * encoding. As a result, the download may *write* outside of the
2511 * given boundaries (if offset and length do not match the 32k FS
2512 * block boundaries). <p>
2514 * The given range can be used to focus a download towards a
2515 * particular portion of the file (optimization), not to strictly
2516 * limit the download to exactly those bytes.
2518 * @param h handle to the file sharing subsystem
2519 * @param sr the search result to use for the download (determines uri and
2520 * meta data and associations)
2521 * @param filename where to store the file, maybe NULL (then no file is
2522 * created on disk and data must be grabbed from the callbacks)
2523 * @param tempname where to store temporary file data, not used if filename is non-NULL;
2524 * can be NULL (in which case we will pick a name if needed); the temporary file
2525 * may already exist, in which case we will try to use the data that is there and
2526 * if it is not what is desired, will overwrite it
2527 * @param offset at what offset should we start the download (typically 0)
2528 * @param length how many bytes should be downloaded starting at offset
2529 * @param anonymity anonymity level to use for the download
2530 * @param options various download options
2531 * @param cctx initial value for the client context for this download
2532 * @return context that can be used to control this download
2534 struct GNUNET_FS_DownloadContext *
2535 GNUNET_FS_download_start_from_search (struct GNUNET_FS_Handle *h,
2536 struct GNUNET_FS_SearchResult *sr,
2537 const char *filename,
2538 const char *tempname, uint64_t offset,
2539 uint64_t length, uint32_t anonymity,
2540 enum GNUNET_FS_DownloadOptions options,
2545 * Stop a download (aborts if download is incomplete).
2547 * @param dc handle for the download
2548 * @param do_delete delete files of incomplete downloads
2551 GNUNET_FS_download_stop (struct GNUNET_FS_DownloadContext *dc, int do_delete);
2555 /* ******************** Directory API *********************** */
2558 #define GNUNET_FS_DIRECTORY_MIME "application/gnunet-directory"
2559 #define GNUNET_FS_DIRECTORY_MAGIC "\211GND\r\n\032\n"
2560 #define GNUNET_FS_DIRECTORY_EXT ".gnd"
2563 * Does the meta-data claim that this is a directory?
2564 * Checks if the mime-type is that of a GNUnet directory.
2566 * @return GNUNET_YES if it is, GNUNET_NO if it is not, GNUNET_SYSERR if
2567 * we have no mime-type information (treat as 'GNUNET_NO')
2570 GNUNET_FS_meta_data_test_for_directory (const struct GNUNET_CONTAINER_MetaData
2575 * Set the MIMETYPE information for the given
2576 * metadata to "application/gnunet-directory".
2578 * @param md metadata to add mimetype to
2581 GNUNET_FS_meta_data_make_directory (struct GNUNET_CONTAINER_MetaData *md);
2585 * Suggest a filename based on given metadata.
2587 * @param md given meta data
2588 * @return NULL if meta data is useless for suggesting a filename
2591 GNUNET_FS_meta_data_suggest_filename (const struct GNUNET_CONTAINER_MetaData
2596 * Function used to process entries in a directory.
2598 * @param cls closure
2599 * @param filename name of the file in the directory
2600 * @param uri URI of the file
2601 * @param metadata metadata for the file; metadata for
2602 * the directory if everything else is NULL/zero
2603 * @param length length of the available data for the file
2604 * (of type size_t since data must certainly fit
2605 * into memory; if files are larger than size_t
2606 * permits, then they will certainly not be
2607 * embedded with the directory itself).
2608 * @param data data available for the file (length bytes)
2610 typedef void (*GNUNET_FS_DirectoryEntryProcessor) (void *cls,
2611 const char *filename,
2612 const struct GNUNET_FS_Uri *
2615 GNUNET_CONTAINER_MetaData *
2616 meta, size_t length,
2621 * Iterate over all entries in a directory. Note that directories
2622 * are structured such that it is possible to iterate over the
2623 * individual blocks as well as over the entire directory. Thus
2624 * a client can call this function on the buffer in the
2625 * GNUNET_FS_ProgressCallback. Also, directories can optionally
2626 * include the contents of (small) files embedded in the directory
2627 * itself; for those files, the processor may be given the
2628 * contents of the file directly by this function.
2630 * @param size number of bytes in data
2631 * @param data pointer to the beginning of the directory
2632 * @param offset offset of data in the directory
2633 * @param dep function to call on each entry
2634 * @param dep_cls closure for dep
2635 * @return GNUNET_OK if this could be a block in a directory,
2636 * GNUNET_NO if this could be part of a directory (but not 100% OK)
2637 * GNUNET_SYSERR if 'data' does not represent a directory
2640 GNUNET_FS_directory_list_contents (size_t size, const void *data,
2642 GNUNET_FS_DirectoryEntryProcessor dep,
2647 * Opaque handle to a directory builder.
2649 struct GNUNET_FS_DirectoryBuilder;
2652 * Create a directory builder.
2654 * @param mdir metadata for the directory
2656 struct GNUNET_FS_DirectoryBuilder *
2657 GNUNET_FS_directory_builder_create (const struct GNUNET_CONTAINER_MetaData
2662 * Add an entry to a directory.
2664 * @param bld directory to extend
2665 * @param uri uri of the entry (must not be a KSK)
2666 * @param md metadata of the entry
2667 * @param data raw data of the entry, can be NULL, otherwise
2668 * data must point to exactly the number of bytes specified
2672 GNUNET_FS_directory_builder_add (struct GNUNET_FS_DirectoryBuilder *bld,
2673 const struct GNUNET_FS_Uri *uri,
2674 const struct GNUNET_CONTAINER_MetaData *md,
2679 * Finish building the directory. Frees the
2680 * builder context and returns the directory
2683 * @param bld directory to finish
2684 * @param rsize set to the number of bytes needed
2685 * @param rdata set to the encoded directory
2686 * @return GNUNET_OK on success
2689 GNUNET_FS_directory_builder_finish (struct GNUNET_FS_DirectoryBuilder *bld,
2690 size_t * rsize, void **rdata);
2693 /* ******************** DirScanner API *********************** */
2695 enum GNUNET_FS_DirScannerProgressUpdateReason
2697 GNUNET_DIR_SCANNER_FIRST = 0,
2698 GNUNET_DIR_SCANNER_NEW_FILE = 1,
2699 GNUNET_DIR_SCANNER_DOES_NOT_EXIST = 2,
2700 GNUNET_DIR_SCANNER_ASKED_TO_STOP = 3,
2701 GNUNET_DIR_SCANNER_FINISHED = 4,
2702 GNUNET_DIR_SCANNER_PROTOCOL_ERROR = 5,
2703 GNUNET_DIR_SCANNER_SHUTDOWN = 6,
2704 GNUNET_DIR_SCANNER_LAST = 7
2708 typedef int (* GNUNET_FS_DirScannerProgressCallback) (
2709 void *cls, struct GNUNET_FS_DirScanner *ds, const char *filename,
2710 char is_directory, enum GNUNET_FS_DirScannerProgressUpdateReason reason);
2713 * A node of a directory tree (produced by dirscanner)
2715 struct GNUNET_FS_ShareTreeItem
2718 * This is a doubly-linked list
2720 struct GNUNET_FS_ShareTreeItem *prev;
2723 * This is a doubly-linked list
2725 struct GNUNET_FS_ShareTreeItem *next;
2728 * This is a doubly-linked tree
2729 * NULL for top-level entries.
2731 struct GNUNET_FS_ShareTreeItem *parent;
2734 * This is a doubly-linked tree
2735 * NULL for files and empty directories
2737 struct GNUNET_FS_ShareTreeItem *children_head;
2740 * This is a doubly-linked tree
2741 * NULL for files and empty directories
2743 struct GNUNET_FS_ShareTreeItem *children_tail;
2746 * Metadata for this file or directory
2748 struct GNUNET_CONTAINER_MetaData *meta;
2751 * Keywords for this file or directory (derived from metadata).
2753 struct GNUNET_FS_Uri *ksk_uri;
2756 * Name of the file/directory
2761 * Base name of the file/directory
2763 char *short_filename;
2766 * 1 if this is a directory
2771 * Size of the file (if it's a file), in bytes
2777 struct GNUNET_FS_DirScanner;
2780 * Signals the scanner to finish the scan as fast as possible.
2782 * Can close the pipe if asked to, but that is only used by the
2783 * internal call to this function during cleanup. The client
2784 * must understand the consequences of closing the pipe too early.
2786 * @param ds directory scanner structure
2787 * @param close_pipe GNUNET_YES to close
2790 GNUNET_FS_directory_scan_finish (struct GNUNET_FS_DirScanner *ds,
2794 * Signals the scanner thread to finish (in case it isn't finishing
2795 * already) and joins the scanner thread. Closes the pipes, frees the
2796 * scanner contexts (both of them), returns the results of the scan.
2797 * Results are valid (and have to be freed) even if the scanner had
2798 * an error or was rushed to finish prematurely.
2799 * Blocks until the scanner is finished.
2801 * @param ds directory scanner structure
2802 * @return the results of the scan (a directory tree)
2804 struct GNUNET_FS_ShareTreeItem *
2805 GNUNET_FS_directory_scan_cleanup (struct GNUNET_FS_DirScanner *ds);
2808 * Start a directory scanner thread.
2810 * @param filename name of the directory to scan
2811 * @param GNUNET_YES to not to run libextractor on files (only build a tree)
2812 * @param ex if not NULL, must be a list of extra plugins for extractor
2813 * @param cb the callback to call when there are scanning progress messages
2814 * @param cls closure for 'cb'
2815 * @return directory scanner object to be used for controlling the scanner
2817 struct GNUNET_FS_DirScanner *
2818 GNUNET_FS_directory_scan_start (const char *filename,
2819 int disable_extractor, const char *ex,
2820 GNUNET_FS_DirScannerProgressCallback cb, void *cls);
2824 struct GNUNET_FS_ProcessMetadataContext;
2827 * Process a share item tree, moving frequent keywords up and
2828 * copying frequent metadata up.
2830 * @param toplevel toplevel directory in the tree, returned by the scanner
2831 * @param cb called after processing is done
2832 * @param cls closure for 'cb'
2834 struct GNUNET_FS_ProcessMetadataContext *
2835 GNUNET_FS_trim_share_tree (struct GNUNET_FS_ShareTreeItem *toplevel,
2836 GNUNET_SCHEDULER_Task cb, void *cls);
2839 #if 0 /* keep Emacsens' auto-indent happy */