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 2, or (at your
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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 definitions for the entire fs module
24 * @author Igor Wronsky, Christian Grothoff
29 #include "gnunet_constants.h"
30 #include "gnunet_datastore_service.h"
31 #include "gnunet_fs_service.h"
34 * Size of the individual blocks used for file-sharing.
36 #define DBLOCK_SIZE (32*1024)
40 * Pick a multiple of 2 here to achive 8-byte alignment!
41 * We also probably want DBlocks to have (roughly) the
42 * same size as IBlocks. With SHA-512, the optimal
43 * value is 32768 byte / 128 byte = 256
44 * (128 byte = 2 * 512 bits). DO NOT CHANGE!
46 #define CHK_PER_INODE 256
50 * Maximum size for a file to be considered for
51 * inlining in a directory.
53 #define MAX_INLINE_SIZE 65536
57 * Blocksize to use when hashing files
58 * for indexing (blocksize for IO, not for
59 * the DBlocks). Larger blocksizes can
60 * be more efficient but will be more disruptive
61 * as far as the scheduler is concerned.
63 #define HASHING_BLOCKSIZE (1024 * 1024)
66 * Number of bits we set per entry in the bloomfilter.
69 #define BLOOMFILTER_K 16
72 * By how much (in ms) do we decrement the TTL
75 #define TTL_DECREMENT 5000
78 * Length of the P2P success tracker. Note that
79 * having a very long list can also hurt performance.
81 #define P2P_SUCCESS_LIST_SIZE 8
85 * Length of the CS-2-P success tracker. Note that
86 * having a very long list can also hurt performance.
88 #define CS2P_SUCCESS_LIST_SIZE 8
91 * How long are we willing to wait for the datastore to be ready to
92 * process a request for a query without priority?
94 #define BASIC_DATASTORE_REQUEST_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
98 * How long are we willing to wait for the core to be ready to
99 * transmit a reply to the target peer (if we can not transmit
100 * until then, we will discard the reply).
102 #define ACCEPTABLE_REPLY_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
106 * Bandwidth value of an (effectively) 0-priority query.
108 #define QUERY_BANDWIDTH_VALUE 0.001
111 * Bandwidth value of a 0-priority content (must be
112 * fairly high compared to query since content is
113 * typically significantly larger -- and more valueable
114 * since it can take many queries to get one piece of
117 #define CONTENT_BANDWIDTH_VALUE 0.8
120 * By which amount do we decrement the TTL for simple forwarding /
121 * indirection of the query; in milli-seconds. Set somewhat in
122 * accordance to your network latency (above the time it'll take you
123 * to send a packet and get a reply).
125 #define TTL_DECREMENT 5000
128 * Until which load do we consider the peer idle and do not
129 * charge at all? (should be larger than GNUNET_IDLE_LOAD_THRESHOLD used
130 * by the rest of the code)!
132 #define IDLE_LOAD_THRESHOLD ((100 + GNUNET_CONSTANTS_IDLE_LOAD_THRESHOLD) / 2)
137 * @brief content hash key
139 struct ContentHashKey
142 GNUNET_HashCode query;
147 * @brief complete information needed
148 * to download a file.
150 struct FileIdentifier
154 * Total size of the file in bytes. (network byte order (!))
156 uint64_t file_length;
159 * Query and key of the top GNUNET_EC_IBlock.
161 struct ContentHashKey chk;
167 * Information about a file and its location
168 * (peer claiming to share the file).
173 * Information about the shared file.
175 struct FileIdentifier fi;
178 * Identity of the peer sharing the file.
180 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded peer;
183 * Time when this location URI expires.
185 struct GNUNET_TIME_Absolute expirationTime;
188 * RSA signature over the GNUNET_EC_FileIdentifier,
189 * GNUNET_hash of the peer and expiration time.
191 struct GNUNET_CRYPTO_RsaSignature contentSignature;
196 { chk, sks, ksk, loc };
199 * A Universal Resource Identifier (URI), opaque.
209 * Keywords start with a '+' if they are
210 * mandatory (in which case the '+' is NOT
211 * part of the keyword) and with a
212 * simple space if they are optional
213 * (in which case the space is ALSO not
214 * part of the actual keyword).
216 * Double-quotes to protect spaces and
217 * %-encoding are NOT used internally
218 * (only in URI-strings).
223 * Size of the keywords array.
225 unsigned int keywordCount;
231 * Hash of the public key for the namespace.
233 GNUNET_HashCode namespace;
236 * Human-readable identifier chosen for this
237 * entry in the namespace.
243 * Information needed to retrieve a file (content-hash-key
246 struct FileIdentifier chk;
249 * Information needed to retrieve a file including signed
250 * location (identity of a peer) of the content.
259 * Information for a file or directory that is
260 * about to be published.
262 struct GNUNET_FS_FileInformation
266 * Files in a directory are kept as a linked list.
268 struct GNUNET_FS_FileInformation *next;
271 * If this is a file in a directory, "dir" refers to
272 * the directory; otherwise NULL.
274 struct GNUNET_FS_FileInformation *dir;
277 * Pointer kept for the client.
282 * Metadata to use for the file.
284 struct GNUNET_CONTAINER_MetaData *meta;
287 * Keywords to use for KBlocks.
289 struct GNUNET_FS_Uri *keywords;
292 * CHK for this file or directory. NULL if
293 * we have not yet computed it.
295 struct GNUNET_FS_Uri *chk_uri;
298 * At what time should the content expire?
300 struct GNUNET_TIME_Absolute expirationTime;
303 * At what time did we start this upload?
305 struct GNUNET_TIME_Absolute start_time;
308 * Under what filename is this struct serialized
309 * (for operational persistence).
314 * Encoder being used to publish this file.
316 struct GNUNET_FS_TreeEncoder *te;
319 * Error message (non-NULL if this operation
325 * Data describing either the file or the directory.
336 * Function that can be used to read the data for the file.
338 GNUNET_FS_DataReader reader;
341 * Closure for reader.
346 * Name of the file (must be an absolute path).
347 * Only required for indexing. FIXME: not yet
353 * If this file is being indexed, this value
354 * is set to the hash over the entire file
355 * (when the indexing process is started).
356 * Otherwise this field is not used.
358 GNUNET_HashCode file_id;
361 * Size of the file (in bytes).
366 * Should the file be indexed or inserted?
371 * Is "file_id" already valid? Set to GNUNET_YES
372 * once the hash has been calculated.
377 * Has the service confirmed our INDEX_START request?
378 * GNUNET_YES if this step has been completed.
380 int index_start_confirmed;
385 * Data for a directory.
390 * Name of the directory. FIXME: currently never set!
395 * Linked list of entries in the directory.
397 struct GNUNET_FS_FileInformation *entries;
400 * Size of the directory itself (in bytes); 0 if the
401 * size has not yet been calculated.
406 * Pointer to the data for the directory (or NULL if not
416 * Is this struct for a file or directory?
421 * Desired anonymity level.
426 * Desired priority (for keeping the content in the DB).
434 * Master context for most FS operations.
436 struct GNUNET_FS_Handle
441 struct GNUNET_SCHEDULER_Handle *sched;
444 * Configuration to use.
446 const struct GNUNET_CONFIGURATION_Handle *cfg;
449 * Name of our client.
454 * Function to call with updates on our progress.
456 GNUNET_FS_ProgressCallback upcb;
464 * Connection to the FS service.
466 struct GNUNET_CLIENT_Connection *client;
469 * How many downloads probing availability
470 * of search results do we have running
473 unsigned int active_probes;
478 enum GNUNET_FS_Flags flags;
484 * Handle for controlling an upload.
486 struct GNUNET_FS_PublishContext
489 * Handle to the global fs context.
491 struct GNUNET_FS_Handle *h;
494 * File-structure that is being shared.
496 struct GNUNET_FS_FileInformation *fi;
499 * Namespace that we are publishing in, NULL if we have no namespace.
501 struct GNUNET_FS_Namespace *namespace;
504 * ID of the content in the namespace, NULL if we have no namespace.
509 * ID for future updates, NULL if we have no namespace or no updates.
514 * Our own client handle for the FS service;
515 * only briefly used when we start to index a
516 * file, otherwise NULL.
518 struct GNUNET_CLIENT_Connection *client;
521 * Current position in the file-tree for the
524 struct GNUNET_FS_FileInformation *fi_pos;
527 * Connection to the datastore service.
529 struct GNUNET_DATASTORE_Handle *dsh;
532 * ID of the task performing the upload. NO_TASK
533 * if the upload has completed.
535 GNUNET_SCHEDULER_TaskIdentifier upload_task;
538 * Typically GNUNET_NO. Set to GNUNET_YES if
539 * "upload_task" is GNUNET_SCHEDULER_NO_TASK
540 * and we're waiting for a response from the
541 * datastore service (in which case this
542 * struct must not be freed until we have that
543 * response). If someone tries to stop the
544 * download for good during this period,
545 * "in_network_wait" is set to GNUNET_SYSERR
546 * which will cause the struct to be destroyed
547 * right after we have the reply (or timeout)
548 * from the datastore service.
553 * Options for publishing.
555 enum GNUNET_FS_PublishOptions options;
558 * Space reservation ID with datastore service
564 * Set to GNUNET_YES if all processing has completed.
571 * Phases of unindex processing (state machine).
576 * We're currently hashing the file.
578 UNINDEX_STATE_HASHING = 0,
581 * We're notifying the FS service about
584 UNINDEX_STATE_FS_NOTIFY = 1,
587 * We're telling the datastore to delete
588 * the respective entries.
590 UNINDEX_STATE_DS_REMOVE = 2,
595 UNINDEX_STATE_COMPLETE = 3,
598 * We've encountered a fatal error.
600 UNINDEX_STATE_ERROR = 4,
603 * We've been aborted. The next callback should clean up the
606 UNINDEX_STATE_ABORTED = 5
611 * Handle for controlling an unindexing operation.
613 struct GNUNET_FS_UnindexContext
619 struct GNUNET_FS_Handle *h;
622 * Name of the file that we are unindexing.
627 * Connection to the FS service,
628 * only valid during the UNINDEX_STATE_FS_NOTIFY
631 struct GNUNET_CLIENT_Connection *client;
634 * Connection to the datastore service,
635 * only valid during the UNINDEX_STATE_DS_NOTIFY
638 struct GNUNET_DATASTORE_Handle *dsh;
641 * Pointer kept for the client.
646 * Merkle-ish tree encoder context.
648 struct GNUNET_FS_TreeEncoder *tc;
651 * Handle used to read the file.
653 struct GNUNET_DISK_FileHandle *fh;
656 * Overall size of the file.
663 struct GNUNET_TIME_Absolute start_time;
666 * Hash of the file's contents (once
669 GNUNET_HashCode file_id;
672 * Current operatinonal phase.
674 enum UnindexState state;
680 * Information we store for each search result.
686 * URI to which this search result
689 struct GNUNET_FS_Uri *uri;
692 * Metadata for the search result.
694 struct GNUNET_CONTAINER_MetaData *meta;
697 * Client info for this search result.
702 * ID of a job that is currently probing
703 * this results' availability (NULL if we
704 * are not currently probing).
706 struct GNUNET_FS_DownloadContext *probe_ctx;
709 * ID of the task that will clean up the probe_ctx
710 * should it not complete on time (and that will
711 * need to be cancelled if we clean up the search
712 * result before then).
714 GNUNET_SCHEDULER_TaskIdentifier probe_cancel_task;
717 * Number of mandatory keywords for which
718 * we have NOT yet found the search result;
719 * when this value hits zero, the search
720 * result is given to the callback.
722 uint32_t mandatory_missing;
725 * Number of optional keywords under which
726 * this result was also found.
728 uint32_t optional_support;
731 * Number of availability tests that
732 * have succeeded for this result.
734 uint32_t availability_success;
737 * Number of availability trials that we
738 * have performed for this search result.
740 uint32_t availability_trials;
746 * Information we keep for each keyword in
749 struct SearchRequestEntry
752 * Hash of the original keyword, also known as the
753 * key (for decrypting the KBlock).
758 * Hash of the public key, also known as the query.
760 GNUNET_HashCode query;
763 * Map that contains a "struct SearchResult" for each result that
764 * was found under this keyword. Note that the entries will point
765 * to the same locations as those in the master result map (in
766 * "struct GNUNET_FS_SearchContext"), so they should not be freed.
767 * The key for each entry is the XOR of the key and query in the CHK
768 * URI (as a unique identifier for the search result).
770 struct GNUNET_CONTAINER_MultiHashMap *results;
773 * Is this keyword a mandatory keyword
774 * (started with '+')?
782 * Handle for controlling a search.
784 struct GNUNET_FS_SearchContext
787 * Handle to the global FS context.
789 struct GNUNET_FS_Handle *h;
792 * List of keywords that we're looking for.
794 struct GNUNET_FS_Uri *uri;
797 * For update-searches, link to the
798 * base-SKS search that triggered the
799 * update search; otherwise NULL.
801 struct GNUNET_FS_SearchContext *parent;
804 * Connection to the FS service.
806 struct GNUNET_CLIENT_Connection *client;
809 * Pointer we keep for the client.
814 * Map that contains a "struct SearchResult" for each result that
815 * was found in the search. The key for each entry is the XOR of
816 * the key and query in the CHK URI (as a unique identifier for the
819 struct GNUNET_CONTAINER_MultiHashMap *master_result_map;
822 * Per-keyword information for a keyword search.
823 * This array will have exactly as many entries
824 * as there were keywords.
826 struct SearchRequestEntry *requests;
831 struct GNUNET_TIME_Absolute start_time;
834 * ID of a task that is using this struct
835 * and that must be cancelled when the search
836 * is being stopped (if not GNUNET_SCHEDULER_NO_TASK).
837 * Used for the task that adds some artificial
838 * delay when trying to reconnect to the FS
841 GNUNET_SCHEDULER_TaskIdentifier task;
844 * Anonymity level for the search.
849 * Number of mandatory keywords in this query.
851 uint32_t mandatory_count;
856 * Information about an active download request.
858 struct DownloadRequest
861 * While pending, we keep all download requests
864 struct DownloadRequest *next;
867 * CHK for the request.
869 struct ContentHashKey chk;
872 * Offset of the corresponding block.
877 * Depth of the corresponding block in the tree.
882 * Set if this request is currently in the linked list of pending
883 * requests. Needed in case we get a response for a request that we
884 * have not yet send (due to FS bug or two blocks with identical
885 * content); in this case, we would need to remove the block from
886 * the pending list (and need a fast way to check if the block is on
895 * Context for controlling a download.
897 struct GNUNET_FS_DownloadContext
903 struct GNUNET_FS_Handle *h;
906 * Connection to the FS service.
908 struct GNUNET_CLIENT_Connection *client;
911 * Parent download (used when downloading files
914 struct GNUNET_FS_DownloadContext *parent;
917 * Context kept for the client.
922 * URI that identifies the file that
923 * we are downloading.
925 struct GNUNET_FS_Uri *uri;
928 * Known meta-data for the file (can be NULL).
930 struct GNUNET_CONTAINER_MetaData *meta;
933 * Error message, NULL if we're doing OK.
938 * Where are we writing the data (name of the
939 * file, can be NULL!).
944 * Map of active requests (those waiting
945 * for a response). The key is the hash
946 * of the encryped block (aka query).
948 struct GNUNET_CONTAINER_MultiHashMap *active;
951 * Linked list of pending requests.
953 struct DownloadRequest *pending;
956 * The file handle, NULL if we don't create
959 struct GNUNET_DISK_FileHandle *handle;
962 * Non-NULL if we are currently having a request for
963 * transmission pending with the client handle.
965 struct GNUNET_CLIENT_TransmitHandle *th;
968 * Identity of the peer having the content, or all-zeros
969 * if we don't know of such a peer.
971 struct GNUNET_PeerIdentity target;
974 * ID of a task that is using this struct
975 * and that must be cancelled when the download
976 * is being stopped (if not GNUNET_SCHEDULER_NO_TASK).
977 * Used for the task that adds some artificial
978 * delay when trying to reconnect to the FS
981 GNUNET_SCHEDULER_TaskIdentifier task;
984 * What was the size of the file on disk that we're downloading
985 * before we started? Used to detect if there is a point in
986 * checking an existing block on disk for matching the desired
987 * content. 0 if the file did not exist already.
989 uint64_t old_file_size;
992 * What is the first offset that we're interested
998 * How many bytes starting from offset are desired?
999 * This is NOT the overall length of the file!
1004 * How many bytes have we already received within
1005 * the specified range (DBlocks only).
1010 * Time download was started.
1012 struct GNUNET_TIME_Absolute start_time;
1015 * Desired level of anonymity.
1020 * The depth of the file-tree.
1022 unsigned int treedepth;
1025 * Options for the download.
1027 enum GNUNET_FS_DownloadOptions options;
1031 struct GNUNET_FS_Namespace
1035 * Private key for the namespace.
1037 struct GNUNET_CRYPTO_RsaPrivateKey *key;
1040 * Reference counter.
1047 * @brief index block (indexing a DBlock that
1048 * can be obtained directly from reading
1049 * the plaintext file)
1051 struct OnDemandBlock
1054 * Hash code of the entire content of the
1055 * file that was indexed (used to uniquely
1056 * identify the plaintext file).
1058 GNUNET_HashCode file_id;
1061 * At which offset should we be able to find
1062 * this on-demand encoded block? (in NBO)
1064 uint64_t offset GNUNET_PACKED;
1070 * @brief keyword block (advertising data under a keyword)
1076 * GNUNET_RSA_Signature using RSA-key generated from search keyword.
1078 struct GNUNET_CRYPTO_RsaSignature signature;
1081 * What is being signed and why?
1083 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
1086 * Key generated (!) from the H(keyword) as the seed!
1088 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded keyspace;
1090 /* 0-terminated URI here */
1092 /* variable-size Meta-Data follows here */
1097 * @brief namespace content block (advertising data under an identifier in a namespace)
1103 * GNUNET_RSA_Signature using RSA-key of the namespace
1105 struct GNUNET_CRYPTO_RsaSignature signature;
1108 * What is being signed and why?
1110 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
1113 * Hash of the hash of the human-readable identifier used for
1114 * this entry (the hash of the human-readable identifier is
1115 * used as the key for decryption; the xor of this identifier
1116 * and the hash of the "keyspace" is the datastore-query hash).
1118 GNUNET_HashCode identifier;
1121 * Public key of the namespace.
1123 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded subspace;
1125 /* 0-terminated update-identifier here */
1127 /* 0-terminated URI here */
1129 /* variable-size Meta-Data follows here */
1135 * Message sent from a GNUnet (fs) publishing activity to the
1136 * gnunet-fs-service to initiate indexing of a file. The service is
1137 * supposed to check if the specified file is available and has the
1138 * same cryptographic hash. It should then respond with either a
1139 * confirmation or a denial.
1141 * On OSes where this works, it is considered acceptable if the
1142 * service only checks that the path, device and inode match (it can
1143 * then be assumed that the hash will also match without actually
1144 * computing it; this is an optimization that should be safe given
1145 * that the client is not our adversary).
1147 struct IndexStartMessage
1151 * Message type will be GNUNET_MESSAGE_TYPE_FS_INDEX_START.
1153 struct GNUNET_MessageHeader header;
1156 * ID of device containing the file, as seen by the client. This
1157 * device ID is obtained using a call like "statvfs" (and converting
1158 * the "f_fsid" field to a 32-bit big-endian number). Use 0 if the
1159 * OS does not support this, in which case the service must do a
1160 * full hash recomputation.
1162 uint32_t device GNUNET_PACKED;
1165 * Inode of the file on the given device, as seen by the client
1166 * ("st_ino" field from "struct stat"). Use 0 if the OS does not
1167 * support this, in which case the service must do a full hash
1170 uint64_t inode GNUNET_PACKED;
1173 * Hash of the file that we would like to index.
1175 GNUNET_HashCode file_id;
1177 /* this is followed by a 0-terminated
1178 filename of a file with the hash
1179 "file_id" as seen by the client */
1185 * Message send by FS service in response to a request
1186 * asking for a list of all indexed files.
1188 struct IndexInfoMessage
1191 * Message type will be
1192 * GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_ENTRY.
1194 struct GNUNET_MessageHeader header;
1199 uint32_t reserved GNUNET_PACKED;
1202 * Hash of the indexed file.
1204 GNUNET_HashCode file_id;
1206 /* this is followed by a 0-terminated
1207 filename of a file with the hash
1208 "file_id" as seen by the client */
1214 * Message sent from a GNUnet (fs) unindexing activity to the
1215 * gnunet-service-fs to indicate that a file will be unindexed. The
1216 * service is supposed to remove the file from the list of indexed
1217 * files and response with a confirmation message (even if the file
1218 * was already not on the list).
1220 struct UnindexMessage
1224 * Message type will be
1225 * GNUNET_MESSAGE_TYPE_FS_UNINDEX.
1227 struct GNUNET_MessageHeader header;
1232 uint32_t reserved GNUNET_PACKED;
1235 * Hash of the file that we will unindex.
1237 GNUNET_HashCode file_id;
1243 * Message sent from a GNUnet (fs) search activity to the
1244 * gnunet-service-fs to start a search.
1246 struct SearchMessage
1250 * Message type will be
1251 * GNUNET_MESSAGE_TYPE_FS_START_SEARCH.
1253 struct GNUNET_MessageHeader header;
1258 int32_t reserved GNUNET_PACKED;
1261 * Type of the content that we're looking for.
1264 uint32_t type GNUNET_PACKED;
1267 * Desired anonymity level, big-endian.
1269 uint32_t anonymity_level GNUNET_PACKED;
1272 * If the request is for a DBLOCK or IBLOCK, this is the identity of
1273 * the peer that is known to have a response. Set to all-zeros if
1274 * such a target is not known (note that even if OUR anonymity
1275 * level is >0 we may happen to know the responder's identity;
1276 * nevertheless, we should probably not use it for a DHT-lookup
1277 * or similar blunt actions in order to avoid exposing ourselves).
1279 * If the request is for an SBLOCK, this is the identity of the
1280 * pseudonym to which the SBLOCK belongs.
1282 * If the request is for a KBLOCK, "target" must be all zeros.
1284 GNUNET_HashCode target;
1287 * Hash of the keyword (aka query) for KBLOCKs; Hash of
1288 * the CHK-encoded block for DBLOCKS and IBLOCKS (aka query)
1289 * and hash of the identifier XORed with the target for
1290 * SBLOCKS (aka query).
1292 GNUNET_HashCode query;
1294 /* this is followed by the hash codes of already-known
1295 results (which should hence be excluded from what
1296 the service returns); naturally, this only applies
1297 to queries that can have multiple results, such as
1298 those for KBLOCKS (KSK) and SBLOCKS (SKS) */
1303 * Only the (mandatory) query is included.
1305 #define GET_MESSAGE_BIT_QUERY_ONLY 0
1308 * The peer identity of a peer waiting for the
1309 * reply is included (used if the response
1310 * should be transmitted to someone other than
1311 * the sender of the GET).
1313 #define GET_MESSAGE_BIT_RETURN_TO 1
1316 * The hash of the public key of the target
1317 * namespace is included (for SKS queries).
1319 #define GET_MESSAGE_BIT_SKS_NAMESPACE 2
1322 * The peer identity of a peer that had claimed to have the content
1323 * previously is included (can be used if responder-anonymity is not
1324 * desired; note that the precursor presumably lacked a direct
1325 * connection to the specified peer; still, the receiver is in no way
1326 * required to limit forwarding only to the specified peer, it should
1327 * only prefer it somewhat if possible).
1329 #define GET_MESSAGE_BIT_TRANSMIT_TO 4
1333 * Message sent between peers asking for FS-content.
1339 * Message type will be GNUNET_MESSAGE_TYPE_FS_GET.
1341 struct GNUNET_MessageHeader header;
1344 * Type of the query (block type).
1346 uint32_t type GNUNET_PACKED;
1349 * How important is this request (network byte order)
1351 uint32_t priority GNUNET_PACKED;
1354 * Relative time to live in GNUNET_CRON_MILLISECONDS (network byte order)
1356 int32_t ttl GNUNET_PACKED;
1359 * The content hash should be mutated using this value
1360 * before checking against the bloomfilter (used to
1361 * get many different filters for the same hash codes).
1362 * The number should be in big-endian format when used
1365 int32_t filter_mutator GNUNET_PACKED;
1368 * Which of the optional hash codes are present at the end of the
1369 * message? See GET_MESSAGE_BIT_xx constants. For each bit that is
1370 * set, an additional GNUNET_HashCode with the respective content
1371 * (in order of the bits) will be appended to the end of the GET
1374 uint32_t hash_bitmap GNUNET_PACKED;
1377 * Hashcodes of the file(s) we're looking for.
1378 * Details depend on the query type.
1380 GNUNET_HashCode query GNUNET_PACKED;
1382 /* this is followed by hash codes
1383 as specified in the "hash_bitmap";
1384 after that, an optional bloomfilter
1385 (with bits set for replies that should
1386 be suppressed) can be present */
1391 * Response from FS service with a result for a previous FS search.
1392 * Note that queries for DBLOCKS and IBLOCKS that have received a
1393 * single response are considered done. This message is transmitted
1394 * between peers as well as between the service and a client.
1400 * Message type will be GNUNET_MESSAGE_TYPE_FS_PUT.
1402 struct GNUNET_MessageHeader header;
1405 * Type of the block (in big endian). Should never be zero.
1407 uint32_t type GNUNET_PACKED;
1410 * When does this result expire?
1412 struct GNUNET_TIME_AbsoluteNBO expiration;
1414 /* this is followed by the actual encrypted content */