2 This file is part of GNUnet.
3 (C) 2001-2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
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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.
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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.
21 * @file fs/fs_download.c
22 * @brief download methods
23 * @author Christian Grothoff
26 * - different priority for scheduling probe downloads?
29 #include "gnunet_constants.h"
30 #include "gnunet_fs_service.h"
36 * Determine if the given download (options and meta data) should cause
37 * use to try to do a recursive download.
40 is_recursive_download (struct GNUNET_FS_DownloadContext *dc)
42 return (0 != (dc->options & GNUNET_FS_DOWNLOAD_OPTION_RECURSIVE)) &&
43 ((GNUNET_YES == GNUNET_FS_meta_data_test_for_directory (dc->meta)) ||
44 ((dc->meta == NULL) &&
45 ((NULL == dc->filename) ||
46 ((strlen (dc->filename) >= strlen (GNUNET_FS_DIRECTORY_EXT)) &&
48 strstr (dc->filename + strlen (dc->filename) -
49 strlen (GNUNET_FS_DIRECTORY_EXT),
50 GNUNET_FS_DIRECTORY_EXT))))));
55 * We're storing the IBLOCKS after the DBLOCKS on disk (so that we
56 * only have to truncate the file once we're done).
58 * Given the offset of a block (with respect to the DBLOCKS) and its
59 * depth, return the offset where we would store this block in the
62 * @param fsize overall file size
63 * @param off offset of the block in the file
64 * @param depth depth of the block in the tree, 0 for DBLOCK
65 * @return off for DBLOCKS (depth == treedepth),
66 * otherwise an offset past the end
67 * of the file that does not overlap
68 * with the range for any other block
71 compute_disk_offset (uint64_t fsize, uint64_t off, unsigned int depth)
74 uint64_t lsize; /* what is the size of all IBlocks for depth "i"? */
75 uint64_t loff; /* where do IBlocks for depth "i" start? */
76 unsigned int ioff; /* which IBlock corresponds to "off" at depth "i"? */
80 /* first IBlocks start at the end of file, rounded up
81 * to full DBLOCK_SIZE */
82 loff = ((fsize + DBLOCK_SIZE - 1) / DBLOCK_SIZE) * DBLOCK_SIZE;
84 ((fsize + DBLOCK_SIZE -
85 1) / DBLOCK_SIZE) * sizeof (struct ContentHashKey);
86 GNUNET_assert (0 == (off % DBLOCK_SIZE));
87 ioff = (off / DBLOCK_SIZE);
88 for (i = 1; i < depth; i++)
91 lsize = (lsize + CHK_PER_INODE - 1) / CHK_PER_INODE;
92 GNUNET_assert (lsize > 0);
93 GNUNET_assert (0 == (ioff % CHK_PER_INODE));
94 ioff /= CHK_PER_INODE;
96 return loff + ioff * sizeof (struct ContentHashKey);
101 * Fill in all of the generic fields for a download event and call the
104 * @param pi structure to fill in
105 * @param dc overall download context
108 GNUNET_FS_download_make_status_ (struct GNUNET_FS_ProgressInfo *pi,
109 struct GNUNET_FS_DownloadContext *dc)
111 pi->value.download.dc = dc;
112 pi->value.download.cctx = dc->client_info;
113 pi->value.download.pctx =
114 (dc->parent == NULL) ? NULL : dc->parent->client_info;
115 pi->value.download.sctx =
116 (dc->search == NULL) ? NULL : dc->search->client_info;
117 pi->value.download.uri = dc->uri;
118 pi->value.download.filename = dc->filename;
119 pi->value.download.size = dc->length;
120 /* FIXME: Fix duration calculation to account for pauses */
121 pi->value.download.duration =
122 GNUNET_TIME_absolute_get_duration (dc->start_time);
123 pi->value.download.completed = dc->completed;
124 pi->value.download.anonymity = dc->anonymity;
125 pi->value.download.eta =
126 GNUNET_TIME_calculate_eta (dc->start_time, dc->completed, dc->length);
127 pi->value.download.is_active = (dc->client == NULL) ? GNUNET_NO : GNUNET_YES;
128 if (0 == (dc->options & GNUNET_FS_DOWNLOAD_IS_PROBE))
129 dc->client_info = dc->h->upcb (dc->h->upcb_cls, pi);
131 dc->client_info = GNUNET_FS_search_probe_progress_ (NULL, pi);
136 * We're ready to transmit a search request to the
137 * file-sharing service. Do it. If there is
138 * more than one request pending, try to send
139 * multiple or request another transmission.
142 * @param size number of bytes available in buf
143 * @param buf where the callee should write the message
144 * @return number of bytes written to buf
147 transmit_download_request (void *cls, size_t size, void *buf);
151 * Closure for iterator processing results.
153 struct ProcessResultClosure
159 GNUNET_HashCode query;
162 * Data found in P2P network.
167 * Our download context.
169 struct GNUNET_FS_DownloadContext *dc;
172 * Number of bytes in data.
179 enum GNUNET_BLOCK_Type type;
182 * Flag to indicate if this block should be stored on disk.
186 struct GNUNET_TIME_Absolute last_transmission;
192 * Iterator over entries in the pending requests in the 'active' map for the
193 * reply that we just got.
195 * @param cls closure (our 'struct ProcessResultClosure')
196 * @param key query for the given value / request
197 * @param value value in the hash map (a 'struct DownloadRequest')
198 * @return GNUNET_YES (we should continue to iterate); unless serious error
201 process_result_with_request (void *cls, const GNUNET_HashCode * key,
206 * We've found a matching block without downloading it.
207 * Encrypt it and pass it to our "receive" function as
208 * if we had received it from the network.
210 * @param dc download in question
211 * @param chk request this relates to
212 * @param dr request details
213 * @param block plaintext data matching request
214 * @param len number of bytes in block
215 * @param do_store should we still store the block on disk?
216 * @return GNUNET_OK on success
219 encrypt_existing_match (struct GNUNET_FS_DownloadContext *dc,
220 const struct ContentHashKey *chk,
221 struct DownloadRequest *dr, const char *block,
222 size_t len, int do_store)
224 struct ProcessResultClosure prc;
226 struct GNUNET_CRYPTO_AesSessionKey sk;
227 struct GNUNET_CRYPTO_AesInitializationVector iv;
228 GNUNET_HashCode query;
230 GNUNET_CRYPTO_hash_to_aes_key (&chk->key, &sk, &iv);
231 if (-1 == GNUNET_CRYPTO_aes_encrypt (block, len, &sk, &iv, enc))
234 return GNUNET_SYSERR;
236 GNUNET_CRYPTO_hash (enc, len, &query);
237 if (0 != memcmp (&query, &chk->query, sizeof (GNUNET_HashCode)))
240 return GNUNET_SYSERR;
242 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
243 "Matching block for `%s' at offset %llu already present, no need for download!\n",
244 dc->filename, (unsigned long long) dr->offset);
245 /* already got it! */
251 dr->depth) ? GNUNET_BLOCK_TYPE_FS_DBLOCK : GNUNET_BLOCK_TYPE_FS_IBLOCK;
252 prc.query = chk->query;
253 prc.do_store = do_store;
254 prc.last_transmission = GNUNET_TIME_UNIT_FOREVER_ABS;
255 process_result_with_request (&prc, &chk->key, dr);
261 * We've lost our connection with the FS service.
262 * Re-establish it and re-transmit all of our
265 * @param dc download context that is having trouble
268 try_reconnect (struct GNUNET_FS_DownloadContext *dc);
272 * We found an entry in a directory. Check if the respective child
273 * already exists and if not create the respective child download.
275 * @param cls the parent download
276 * @param filename name of the file in the directory
277 * @param uri URI of the file (CHK or LOC)
278 * @param meta meta data of the file
279 * @param length number of bytes in data
280 * @param data contents of the file (or NULL if they were not inlined)
283 trigger_recursive_download (void *cls, const char *filename,
284 const struct GNUNET_FS_Uri *uri,
285 const struct GNUNET_CONTAINER_MetaData *meta,
286 size_t length, const void *data);
290 * We're done downloading a directory. Open the file and
291 * trigger all of the (remaining) child downloads.
293 * @param dc context of download that just completed
296 full_recursive_download (struct GNUNET_FS_DownloadContext *dc)
301 struct GNUNET_DISK_FileHandle *h;
302 struct GNUNET_DISK_MapHandle *m;
304 size64 = GNUNET_FS_uri_chk_get_file_size (dc->uri);
305 size = (size_t) size64;
306 if (size64 != (uint64_t) size)
308 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
310 ("Recursive downloads of directories larger than 4 GB are not supported on 32-bit systems\n"));
313 if (dc->filename != NULL)
315 h = GNUNET_DISK_file_open (dc->filename, GNUNET_DISK_OPEN_READ,
316 GNUNET_DISK_PERM_NONE);
320 GNUNET_assert (dc->temp_filename != NULL);
321 h = GNUNET_DISK_file_open (dc->temp_filename, GNUNET_DISK_OPEN_READ,
322 GNUNET_DISK_PERM_NONE);
326 data = GNUNET_DISK_file_map (h, &m, GNUNET_DISK_MAP_TYPE_READ, size);
329 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
330 _("Directory too large for system address space\n"));
334 GNUNET_FS_directory_list_contents (size, data, 0,
335 &trigger_recursive_download, dc);
336 GNUNET_DISK_file_unmap (m);
338 GNUNET_DISK_file_close (h);
339 if (dc->filename == NULL)
341 if (0 != UNLINK (dc->temp_filename))
342 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "unlink",
344 GNUNET_free (dc->temp_filename);
345 dc->temp_filename = NULL;
351 * Check if all child-downloads have completed (or trigger them if
352 * necessary) and once we're completely done, signal completion (and
353 * possibly recurse to parent). This function MUST be called when the
354 * download of a file itself is done or when the download of a file is
355 * done and then later a direct child download has completed (and
356 * hence this download may complete itself).
358 * @param dc download to check for completion of children
361 check_completed (struct GNUNET_FS_DownloadContext *dc)
363 struct GNUNET_FS_ProgressInfo pi;
364 struct GNUNET_FS_DownloadContext *pos;
366 /* first, check if we need to download children */
367 if ((dc->child_head == NULL) && (is_recursive_download (dc)))
368 full_recursive_download (dc);
369 /* then, check if children are done already */
370 pos = dc->child_head;
373 if ((pos->emsg == NULL) && (pos->completed < pos->length))
374 return; /* not done yet */
375 if ((pos->child_head != NULL) && (pos->has_finished != GNUNET_YES))
376 return; /* not transitively done yet */
379 /* All of our children are done, so mark this download done */
380 dc->has_finished = GNUNET_YES;
381 if (dc->job_queue != NULL)
383 GNUNET_FS_dequeue_ (dc->job_queue);
384 dc->job_queue = NULL;
386 GNUNET_FS_download_sync_ (dc);
388 /* signal completion */
389 pi.status = GNUNET_FS_STATUS_DOWNLOAD_COMPLETED;
390 GNUNET_FS_download_make_status_ (&pi, dc);
392 /* let parent know */
393 if (dc->parent != NULL)
394 check_completed (dc->parent);
399 * We got a block of plaintext data (from the meta data).
400 * Try it for upward reconstruction of the data. On success,
401 * the top-level block will move to state BRS_DOWNLOAD_UP.
403 * @param dc context for the download
404 * @param dr download request to match against
405 * @param data plaintext data, starting from the beginning of the file
406 * @param data_len number of bytes in data
409 try_match_block (struct GNUNET_FS_DownloadContext *dc,
410 struct DownloadRequest *dr, const char *data, size_t data_len)
412 struct GNUNET_FS_ProgressInfo pi;
414 char enc[DBLOCK_SIZE];
415 struct ContentHashKey chks[CHK_PER_INODE];
416 struct ContentHashKey in_chk;
417 struct GNUNET_CRYPTO_AesSessionKey sk;
418 struct GNUNET_CRYPTO_AesInitializationVector iv;
420 struct DownloadRequest *drc;
421 struct GNUNET_DISK_FileHandle *fh;
428 odata_len = data_len;
429 if (BRS_DOWNLOAD_UP == dr->state)
433 complete = GNUNET_YES;
434 for (i = 0; i < dr->num_children; i++)
436 drc = dr->children[i];
437 try_match_block (dc, drc, data, data_len);
438 if (drc->state != BRS_RECONSTRUCT_META_UP)
439 complete = GNUNET_NO;
443 if (GNUNET_YES != complete)
445 data = (const char *) chks;
446 dlen = dr->num_children * sizeof (struct ContentHashKey);
450 if (dr->offset > data_len)
452 dlen = GNUNET_MIN (data_len - dr->offset, DBLOCK_SIZE);
454 GNUNET_CRYPTO_hash (&data[dr->offset], dlen, &in_chk.key);
455 GNUNET_CRYPTO_hash_to_aes_key (&in_chk.key, &sk, &iv);
456 if (-1 == GNUNET_CRYPTO_aes_encrypt (&data[dr->offset], dlen, &sk, &iv, enc))
461 GNUNET_CRYPTO_hash (enc, dlen, &in_chk.query);
466 dr->state = BRS_RECONSTRUCT_META_UP;
469 if (0 != memcmp (&in_chk, &dr->chk, sizeof (struct ContentHashKey)))
471 /* other peer provided bogus meta data */
475 /* write block to disk */
476 fn = dc->filename != NULL ? dc->filename : dc->temp_filename;
477 fh = GNUNET_DISK_file_open (fn,
478 GNUNET_DISK_OPEN_READWRITE |
479 GNUNET_DISK_OPEN_CREATE |
480 GNUNET_DISK_OPEN_TRUNCATE,
481 GNUNET_DISK_PERM_USER_READ |
482 GNUNET_DISK_PERM_USER_WRITE |
483 GNUNET_DISK_PERM_GROUP_READ |
484 GNUNET_DISK_PERM_OTHER_READ);
487 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, "open", fn);
488 GNUNET_asprintf (&dc->emsg, _("Failed to open file `%s' for writing"),
490 GNUNET_DISK_file_close (fh);
491 dr->state = BRS_ERROR;
492 pi.status = GNUNET_FS_STATUS_DOWNLOAD_ERROR;
493 pi.value.download.specifics.error.message = dc->emsg;
494 GNUNET_FS_download_make_status_ (&pi, dc);
497 if (data_len != GNUNET_DISK_file_write (fh, odata, odata_len))
499 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, "write", fn);
500 GNUNET_asprintf (&dc->emsg, _("Failed to open file `%s' for writing"),
502 GNUNET_DISK_file_close (fh);
503 dr->state = BRS_ERROR;
504 pi.status = GNUNET_FS_STATUS_DOWNLOAD_ERROR;
505 pi.value.download.specifics.error.message = dc->emsg;
506 GNUNET_FS_download_make_status_ (&pi, dc);
509 GNUNET_DISK_file_close (fh);
511 dr->state = BRS_DOWNLOAD_UP;
512 dc->completed = dc->length;
513 GNUNET_FS_download_sync_ (dc);
514 pi.status = GNUNET_FS_STATUS_DOWNLOAD_PROGRESS;
515 pi.value.download.specifics.progress.data = data;
516 pi.value.download.specifics.progress.offset = 0;
517 pi.value.download.specifics.progress.data_len = dlen;
518 pi.value.download.specifics.progress.depth = 0;
519 pi.value.download.specifics.progress.trust_offered = 0;
520 GNUNET_FS_download_make_status_ (&pi, dc);
521 if ((NULL != dc->filename) &&
523 truncate (dc->filename,
524 GNUNET_ntohll (dc->uri->data.chk.file_length))))
525 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "truncate",
527 check_completed (dc);
530 /* how did we get here? */
538 * Type of a function that libextractor calls for each
539 * meta data item found. If we find full data meta data,
540 * call 'try_match_block' on it.
542 * @param cls our 'struct GNUNET_FS_DownloadContext*'
543 * @param plugin_name name of the plugin that produced this value;
544 * special values can be used (i.e. '<zlib>' for zlib being
545 * used in the main libextractor library and yielding
547 * @param type libextractor-type describing the meta data
548 * @param format basic format information about data
549 * @param data_mime_type mime-type of data (not of the original file);
550 * can be NULL (if mime-type is not known)
551 * @param data actual meta-data found
552 * @param data_len number of bytes in data
553 * @return 0 to continue extracting, 1 to abort
556 match_full_data (void *cls, const char *plugin_name,
557 enum EXTRACTOR_MetaType type, enum EXTRACTOR_MetaFormat format,
558 const char *data_mime_type, const char *data, size_t data_len)
560 struct GNUNET_FS_DownloadContext *dc = cls;
562 if (type != EXTRACTOR_METATYPE_GNUNET_FULL_DATA)
564 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found %u bytes of FD!\n",
565 (unsigned int) data_len);
566 if (GNUNET_FS_uri_chk_get_file_size (dc->uri) != data_len)
569 return 1; /* bogus meta data */
571 try_match_block (dc, dc->top_request, data, data_len);
577 * Set the state of the given download request to
578 * BRS_DOWNLOAD_UP and propagate it up the tree.
580 * @param dr download request that is done
583 propagate_up (struct DownloadRequest *dr)
589 dr->state = BRS_DOWNLOAD_UP;
593 for (i = 0; i < dr->num_children; i++)
594 if (dr->children[i]->state != BRS_DOWNLOAD_UP)
597 while (i == dr->num_children);
602 * Try top-down reconstruction. Before, the given request node
603 * must have the state BRS_CHK_SET. Afterwards, more nodes may
604 * have that state or advanced to BRS_DOWNLOAD_DOWN or even
605 * BRS_DOWNLOAD_UP. It is also possible to get BRS_ERROR on the
608 * @param dc overall download this block belongs to
609 * @param dr block to reconstruct
612 try_top_down_reconstruction (struct GNUNET_FS_DownloadContext *dc,
613 struct DownloadRequest *dr)
616 char block[DBLOCK_SIZE];
621 unsigned int chk_off;
622 struct DownloadRequest *drc;
623 uint64_t child_block_size;
624 const struct ContentHashKey *chks;
627 GNUNET_assert (dc->rfh != NULL);
628 GNUNET_assert (dr->state == BRS_CHK_SET);
629 total = GNUNET_FS_uri_chk_get_file_size (dc->uri);
630 GNUNET_assert (dr->depth < dc->treedepth);
631 len = GNUNET_FS_tree_calculate_block_size (total, dr->offset, dr->depth);
632 GNUNET_assert (len <= DBLOCK_SIZE);
633 off = compute_disk_offset (total, dr->offset, dr->depth);
634 if (dc->old_file_size < off + len)
635 return; /* failure */
636 if (off != GNUNET_DISK_file_seek (dc->rfh, off, GNUNET_DISK_SEEK_SET))
638 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "seek", dc->filename);
639 return; /* failure */
641 if (len != GNUNET_DISK_file_read (dc->rfh, block, len))
643 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "read", dc->filename);
644 return; /* failure */
646 GNUNET_CRYPTO_hash (block, len, &key);
647 if (0 != memcmp (&key, &dr->chk.key, sizeof (GNUNET_HashCode)))
648 return; /* mismatch */
650 encrypt_existing_match (dc, &dr->chk, dr, block, len, GNUNET_NO))
652 /* hash matches but encrypted block does not, really bad */
653 dr->state = BRS_ERROR;
655 while (dr->parent != NULL)
658 dr->state = BRS_ERROR;
663 dr->state = BRS_DOWNLOAD_DOWN;
665 /* set CHKs for children */
666 up_done = GNUNET_YES;
667 chks = (const struct ContentHashKey *) block;
668 for (i = 0; i < dr->num_children; i++)
670 drc = dr->children[i];
671 GNUNET_assert (drc->offset >= dr->offset);
672 child_block_size = GNUNET_FS_tree_compute_tree_size (drc->depth);
673 GNUNET_assert (0 == (drc->offset - dr->offset) % child_block_size);
674 chk_off = (drc->offset - dr->offset) / child_block_size;
675 if (drc->state == BRS_INIT)
677 drc->state = BRS_CHK_SET;
678 drc->chk = chks[chk_off];
679 try_top_down_reconstruction (dc, drc);
681 if (drc->state != BRS_DOWNLOAD_UP)
682 up_done = GNUNET_NO; /* children not all done */
684 if (up_done == GNUNET_YES)
685 propagate_up (dr); /* children all done (or no children...) */
690 * Schedule the download of the specified block in the tree.
692 * @param dc overall download this block belongs to
693 * @param dr request to schedule
696 schedule_block_download (struct GNUNET_FS_DownloadContext *dc,
697 struct DownloadRequest *dr)
706 case BRS_RECONSTRUCT_DOWN:
709 case BRS_RECONSTRUCT_META_UP:
712 case BRS_RECONSTRUCT_UP:
716 /* normal case, start download */
718 case BRS_DOWNLOAD_DOWN:
719 for (i = 0; i < dr->num_children; i++)
720 schedule_block_download (dc, dr->children[i]);
722 case BRS_DOWNLOAD_UP:
729 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
730 "Scheduling download at offset %llu and depth %u for `%s'\n",
731 (unsigned long long) dr->offset, dr->depth,
732 GNUNET_h2s (&dr->chk.query));
734 GNUNET_CONTAINER_multihashmap_contains_value (dc->active, &dr->chk.query,
736 return; /* already active */
737 GNUNET_CONTAINER_multihashmap_put (dc->active, &dr->chk.query, dr,
738 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
739 if (dc->client == NULL)
740 return; /* download not active */
741 GNUNET_CONTAINER_DLL_insert (dc->pending_head, dc->pending_tail, dr);
742 dr->is_pending = GNUNET_YES;
745 GNUNET_CLIENT_notify_transmit_ready (dc->client,
746 sizeof (struct SearchMessage),
747 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
749 &transmit_download_request, dc);
753 #define GNUNET_FS_URI_CHK_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_CHK_INFIX
756 * We found an entry in a directory. Check if the respective child
757 * already exists and if not create the respective child download.
759 * @param cls the parent download
760 * @param filename name of the file in the directory
761 * @param uri URI of the file (CHK or LOC)
762 * @param meta meta data of the file
763 * @param length number of bytes in data
764 * @param data contents of the file (or NULL if they were not inlined)
767 trigger_recursive_download (void *cls, const char *filename,
768 const struct GNUNET_FS_Uri *uri,
769 const struct GNUNET_CONTAINER_MetaData *meta,
770 size_t length, const void *data)
772 struct GNUNET_FS_DownloadContext *dc = cls;
773 struct GNUNET_FS_DownloadContext *cpos;
784 return; /* entry for the directory itself */
785 cpos = dc->child_head;
788 if ((GNUNET_FS_uri_test_equal (uri, cpos->uri)) ||
789 ((filename != NULL) && (0 == strcmp (cpos->filename, filename))))
794 return; /* already exists */
796 if (NULL == filename)
798 fn = GNUNET_FS_meta_data_suggest_filename (meta);
801 us = GNUNET_FS_uri_to_string (uri);
802 fn = GNUNET_strdup (&us[strlen (GNUNET_FS_URI_CHK_PREFIX)]);
805 else if (fn[0] == '.')
808 us = GNUNET_FS_uri_to_string (uri);
809 GNUNET_asprintf (&fn, "%s%s", &us[strlen (GNUNET_FS_URI_CHK_PREFIX)],
814 /* change '\' to '/' (this should have happened
815 * during insertion, but malicious peers may
816 * not have done this) */
817 while (NULL != (pos = strstr (fn, "\\")))
819 /* remove '../' everywhere (again, well-behaved
820 * peers don't do this, but don't trust that
821 * we did not get something nasty) */
822 while (NULL != (pos = strstr (fn, "../")))
830 if (dc->filename == NULL)
836 dn = GNUNET_strdup (dc->filename);
837 GNUNET_break ((strlen (dn) >= strlen (GNUNET_FS_DIRECTORY_EXT)) &&
839 strstr (dn + strlen (dn) - strlen (GNUNET_FS_DIRECTORY_EXT),
840 GNUNET_FS_DIRECTORY_EXT)));
841 sfn = GNUNET_strdup (filename);
842 while ((strlen (sfn) > 0) && (filename[strlen (sfn) - 1] == '/'))
843 sfn[strlen (sfn) - 1] = '\0';
844 if ((strlen (dn) >= strlen (GNUNET_FS_DIRECTORY_EXT)) &&
846 strstr (dn + strlen (dn) - strlen (GNUNET_FS_DIRECTORY_EXT),
847 GNUNET_FS_DIRECTORY_EXT)))
848 dn[strlen (dn) - strlen (GNUNET_FS_DIRECTORY_EXT)] = '\0';
849 if ((GNUNET_YES == GNUNET_FS_meta_data_test_for_directory (meta)) &&
850 ((strlen (filename) < strlen (GNUNET_FS_DIRECTORY_EXT)) ||
852 strstr (filename + strlen (filename) -
853 strlen (GNUNET_FS_DIRECTORY_EXT), GNUNET_FS_DIRECTORY_EXT))))
855 GNUNET_asprintf (&full_name, "%s%s%s%s", dn, DIR_SEPARATOR_STR, sfn,
856 GNUNET_FS_DIRECTORY_EXT);
860 GNUNET_asprintf (&full_name, "%s%s%s", dn, DIR_SEPARATOR_STR, sfn);
865 if ((full_name != NULL) &&
866 (GNUNET_OK != GNUNET_DISK_directory_create_for_file (full_name)))
868 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
870 ("Failed to create directory for recursive download of `%s'\n"),
872 GNUNET_free (full_name);
873 GNUNET_free_non_null (fn);
878 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
879 "Triggering recursive download of size %llu with %u bytes MD\n",
880 (unsigned long long) GNUNET_FS_uri_chk_get_file_size (uri),
882 GNUNET_CONTAINER_meta_data_get_serialized_size (meta));
883 GNUNET_FS_download_start (dc->h, uri, meta, full_name, temp_name, 0,
884 GNUNET_FS_uri_chk_get_file_size (uri),
885 dc->anonymity, dc->options, NULL, dc);
886 GNUNET_free_non_null (full_name);
887 GNUNET_free_non_null (temp_name);
888 GNUNET_free_non_null (fn);
893 * (recursively) free download request structure
895 * @param dr request to free
898 GNUNET_FS_free_download_request_ (struct DownloadRequest *dr)
904 for (i = 0; i < dr->num_children; i++)
905 GNUNET_FS_free_download_request_ (dr->children[i]);
906 GNUNET_free_non_null (dr->children);
912 * Iterator over entries in the pending requests in the 'active' map for the
913 * reply that we just got.
915 * @param cls closure (our 'struct ProcessResultClosure')
916 * @param key query for the given value / request
917 * @param value value in the hash map (a 'struct DownloadRequest')
918 * @return GNUNET_YES (we should continue to iterate); unless serious error
921 process_result_with_request (void *cls, const GNUNET_HashCode * key,
924 struct ProcessResultClosure *prc = cls;
925 struct DownloadRequest *dr = value;
926 struct GNUNET_FS_DownloadContext *dc = prc->dc;
927 struct DownloadRequest *drc;
928 struct GNUNET_DISK_FileHandle *fh = NULL;
929 struct GNUNET_CRYPTO_AesSessionKey skey;
930 struct GNUNET_CRYPTO_AesInitializationVector iv;
932 struct GNUNET_FS_ProgressInfo pi;
937 struct ContentHashKey *chkarr;
939 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
940 "Received block `%s' matching pending request at depth %u and offset %llu/%llu\n",
941 GNUNET_h2s (key), dr->depth, (unsigned long long) dr->offset,
942 (unsigned long long) GNUNET_ntohll (dc->uri->data.
944 bs = GNUNET_FS_tree_calculate_block_size (GNUNET_ntohll
945 (dc->uri->data.chk.file_length),
946 dr->offset, dr->depth);
949 GNUNET_asprintf (&dc->emsg,
951 ("Internal error or bogus download URI (expected %u bytes at depth %u and offset %llu/%llu, got %u bytes)\n"),
952 bs, dr->depth, (unsigned long long) dr->offset,
953 (unsigned long long) GNUNET_ntohll (dc->uri->data.
956 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "%s", dc->emsg);
957 while (dr->parent != NULL)
959 dr->state = BRS_ERROR;
962 dr->state = BRS_ERROR;
966 (void) GNUNET_CONTAINER_multihashmap_remove (dc->active, &prc->query, dr);
967 if (GNUNET_YES == dr->is_pending)
969 GNUNET_CONTAINER_DLL_remove (dc->pending_head, dc->pending_tail, dr);
970 dr->is_pending = GNUNET_NO;
973 GNUNET_CRYPTO_hash_to_aes_key (&dr->chk.key, &skey, &iv);
974 if (-1 == GNUNET_CRYPTO_aes_decrypt (prc->data, prc->size, &skey, &iv, pt))
977 dc->emsg = GNUNET_strdup (_("internal error decrypting content"));
981 compute_disk_offset (GNUNET_ntohll (dc->uri->data.chk.file_length),
982 dr->offset, dr->depth);
984 if ((GNUNET_YES == prc->do_store) &&
985 ((dc->filename != NULL) || (is_recursive_download (dc))) &&
986 ((dr->depth == dc->treedepth) ||
987 (0 == (dc->options & GNUNET_FS_DOWNLOAD_NO_TEMPORARIES))))
989 fh = GNUNET_DISK_file_open (dc->filename !=
990 NULL ? dc->filename : dc->temp_filename,
991 GNUNET_DISK_OPEN_READWRITE |
992 GNUNET_DISK_OPEN_CREATE,
993 GNUNET_DISK_PERM_USER_READ |
994 GNUNET_DISK_PERM_USER_WRITE |
995 GNUNET_DISK_PERM_GROUP_READ |
996 GNUNET_DISK_PERM_OTHER_READ);
999 GNUNET_asprintf (&dc->emsg,
1000 _("Download failed: could not open file `%s': %s\n"),
1001 dc->filename, STRERROR (errno));
1004 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1005 "Saving decrypted block to disk at offset %llu\n",
1006 (unsigned long long) off);
1007 if ((off != GNUNET_DISK_file_seek (fh, off, GNUNET_DISK_SEEK_SET)))
1009 GNUNET_asprintf (&dc->emsg,
1010 _("Failed to seek to offset %llu in file `%s': %s\n"),
1011 (unsigned long long) off, dc->filename,
1015 if (prc->size != GNUNET_DISK_file_write (fh, pt, prc->size))
1017 GNUNET_asprintf (&dc->emsg,
1019 ("Failed to write block of %u bytes at offset %llu in file `%s': %s\n"),
1020 (unsigned int) prc->size, (unsigned long long) off,
1021 dc->filename, STRERROR (errno));
1024 GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
1030 /* DBLOCK, update progress and try recursion if applicable */
1032 if (dr->offset < dc->offset)
1034 /* starting offset begins in the middle of pt,
1035 * do not count first bytes as progress */
1036 GNUNET_assert (app > (dc->offset - dr->offset));
1037 app -= (dc->offset - dr->offset);
1039 if (dr->offset + prc->size > dc->offset + dc->length)
1041 /* end of block is after relevant range,
1042 * do not count last bytes as progress */
1043 GNUNET_assert (app >
1044 (dr->offset + prc->size) - (dc->offset + dc->length));
1045 app -= (dr->offset + prc->size) - (dc->offset + dc->length);
1047 dc->completed += app;
1049 /* do recursive download if option is set and either meta data
1050 * says it is a directory or if no meta data is given AND filename
1051 * ends in '.gnd' (top-level case) */
1052 if (is_recursive_download (dc))
1053 GNUNET_FS_directory_list_contents (prc->size, pt, off,
1054 &trigger_recursive_download, dc);
1057 GNUNET_assert (dc->completed <= dc->length);
1058 dr->state = BRS_DOWNLOAD_DOWN;
1059 pi.status = GNUNET_FS_STATUS_DOWNLOAD_PROGRESS;
1060 pi.value.download.specifics.progress.data = pt;
1061 pi.value.download.specifics.progress.offset = dr->offset;
1062 pi.value.download.specifics.progress.data_len = prc->size;
1063 pi.value.download.specifics.progress.depth = dr->depth;
1064 pi.value.download.specifics.progress.trust_offered = 0;
1065 if (prc->last_transmission.abs_value != GNUNET_TIME_UNIT_FOREVER_ABS.abs_value)
1066 pi.value.download.specifics.progress.block_download_duration =
1067 GNUNET_TIME_absolute_get_duration (prc->last_transmission);
1069 pi.value.download.specifics.progress.block_download_duration.rel_value =
1070 GNUNET_TIME_UNIT_FOREVER_REL.rel_value;
1071 GNUNET_FS_download_make_status_ (&pi, dc);
1075 if (dc->completed == dc->length)
1077 /* download completed, signal */
1078 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1079 "Download completed, truncating file to desired length %llu\n",
1080 (unsigned long long) GNUNET_ntohll (dc->uri->data.
1082 /* truncate file to size (since we store IBlocks at the end) */
1083 if (dc->filename != NULL)
1086 truncate (dc->filename,
1087 GNUNET_ntohll (dc->uri->data.chk.file_length)))
1088 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "truncate",
1091 GNUNET_assert (dr->depth == 0);
1092 check_completed (dc);
1096 /* bottom of the tree, no child downloads possible, just sync */
1097 GNUNET_FS_download_sync_ (dc);
1101 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1102 "Triggering downloads of children (this block was at depth %u and offset %llu)\n",
1103 dr->depth, (unsigned long long) dr->offset);
1104 GNUNET_assert (0 == (prc->size % sizeof (struct ContentHashKey)));
1105 chkarr = (struct ContentHashKey *) pt;
1106 for (i = (prc->size / sizeof (struct ContentHashKey)) - 1; i >= 0; i--)
1108 drc = dr->children[i];
1112 drc->chk = chkarr[i];
1113 drc->state = BRS_CHK_SET;
1114 schedule_block_download (dc, drc);
1116 case BRS_RECONSTRUCT_DOWN:
1119 case BRS_RECONSTRUCT_META_UP:
1122 case BRS_RECONSTRUCT_UP:
1128 case BRS_DOWNLOAD_DOWN:
1131 case BRS_DOWNLOAD_UP:
1142 GNUNET_FS_download_sync_ (dc);
1147 GNUNET_DISK_file_close (fh);
1148 pi.status = GNUNET_FS_STATUS_DOWNLOAD_ERROR;
1149 pi.value.download.specifics.error.message = dc->emsg;
1150 GNUNET_FS_download_make_status_ (&pi, dc);
1151 /* abort all pending requests */
1154 GNUNET_CLIENT_notify_transmit_ready_cancel (dc->th);
1157 GNUNET_CLIENT_disconnect (dc->client, GNUNET_NO);
1158 dc->in_receive = GNUNET_NO;
1160 GNUNET_FS_free_download_request_ (dc->top_request);
1161 dc->top_request = NULL;
1162 GNUNET_CONTAINER_multihashmap_destroy (dc->active);
1164 dc->pending_head = NULL;
1165 dc->pending_tail = NULL;
1166 GNUNET_FS_download_sync_ (dc);
1172 * Process a download result.
1174 * @param dc our download context
1175 * @param type type of the result
1176 * @param last_transmission when was this block requested the last time? (FOREVER if unknown/not applicable)
1177 * @param data the (encrypted) response
1178 * @param size size of data
1181 process_result (struct GNUNET_FS_DownloadContext *dc,
1182 enum GNUNET_BLOCK_Type type,
1183 struct GNUNET_TIME_Absolute last_transmission,
1184 const void *data, size_t size)
1186 struct ProcessResultClosure prc;
1192 prc.do_store = GNUNET_YES;
1193 prc.last_transmission = last_transmission;
1194 GNUNET_CRYPTO_hash (data, size, &prc.query);
1195 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1196 "Received result for query `%s' from `%s'-service\n",
1197 GNUNET_h2s (&prc.query), "FS");
1198 GNUNET_CONTAINER_multihashmap_get_multiple (dc->active, &prc.query,
1199 &process_result_with_request,
1205 * Type of a function to call when we receive a message
1208 * @param cls closure
1209 * @param msg message received, NULL on timeout or fatal error
1212 receive_results (void *cls, const struct GNUNET_MessageHeader *msg)
1214 struct GNUNET_FS_DownloadContext *dc = cls;
1215 const struct ClientPutMessage *cm;
1218 if ((NULL == msg) || (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_FS_PUT) ||
1219 (sizeof (struct ClientPutMessage) > ntohs (msg->size)))
1221 GNUNET_break (msg == NULL);
1225 msize = ntohs (msg->size);
1226 cm = (const struct ClientPutMessage *) msg;
1227 process_result (dc, ntohl (cm->type),
1228 GNUNET_TIME_absolute_ntoh (cm->last_transmission), &cm[1],
1229 msize - sizeof (struct ClientPutMessage));
1230 if (dc->client == NULL)
1231 return; /* fatal error */
1232 /* continue receiving */
1233 GNUNET_CLIENT_receive (dc->client, &receive_results, dc,
1234 GNUNET_TIME_UNIT_FOREVER_REL);
1240 * We're ready to transmit a search request to the
1241 * file-sharing service. Do it. If there is
1242 * more than one request pending, try to send
1243 * multiple or request another transmission.
1245 * @param cls closure
1246 * @param size number of bytes available in buf
1247 * @param buf where the callee should write the message
1248 * @return number of bytes written to buf
1251 transmit_download_request (void *cls, size_t size, void *buf)
1253 struct GNUNET_FS_DownloadContext *dc = cls;
1255 struct SearchMessage *sm;
1256 struct DownloadRequest *dr;
1261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1262 "Transmitting download request failed, trying to reconnect\n");
1266 GNUNET_assert (size >= sizeof (struct SearchMessage));
1269 while ((NULL != (dr = dc->pending_head)) &&
1270 (size >= msize + sizeof (struct SearchMessage)))
1272 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1273 "Transmitting download request for `%s' to `%s'-service\n",
1274 GNUNET_h2s (&dr->chk.query), "FS");
1275 memset (sm, 0, sizeof (struct SearchMessage));
1276 sm->header.size = htons (sizeof (struct SearchMessage));
1277 sm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_START_SEARCH);
1278 if (0 != (dc->options & GNUNET_FS_DOWNLOAD_OPTION_LOOPBACK_ONLY))
1279 sm->options = htonl (GNUNET_FS_SEARCH_OPTION_LOOPBACK_ONLY);
1281 sm->options = htonl (GNUNET_FS_SEARCH_OPTION_NONE);
1283 sm->type = htonl (GNUNET_BLOCK_TYPE_FS_DBLOCK);
1285 sm->type = htonl (GNUNET_BLOCK_TYPE_FS_IBLOCK);
1286 sm->anonymity_level = htonl (dc->anonymity);
1287 sm->target = dc->target.hashPubKey;
1288 sm->query = dr->chk.query;
1289 GNUNET_CONTAINER_DLL_remove (dc->pending_head, dc->pending_tail, dr);
1290 dr->is_pending = GNUNET_NO;
1291 msize += sizeof (struct SearchMessage);
1294 if (dc->pending_head != NULL)
1297 GNUNET_CLIENT_notify_transmit_ready (dc->client,
1298 sizeof (struct SearchMessage),
1299 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1301 &transmit_download_request, dc);
1302 GNUNET_assert (dc->th != NULL);
1304 if (GNUNET_NO == dc->in_receive)
1306 dc->in_receive = GNUNET_YES;
1307 GNUNET_CLIENT_receive (dc->client, &receive_results, dc,
1308 GNUNET_TIME_UNIT_FOREVER_REL);
1315 * Reconnect to the FS service and transmit our queries NOW.
1317 * @param cls our download context
1321 do_reconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1323 struct GNUNET_FS_DownloadContext *dc = cls;
1324 struct GNUNET_CLIENT_Connection *client;
1326 dc->task = GNUNET_SCHEDULER_NO_TASK;
1327 client = GNUNET_CLIENT_connect ("fs", dc->h->cfg);
1330 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1331 "Connecting to `%s'-service failed, will try again.\n", "FS");
1335 dc->client = client;
1336 if (dc->pending_head != NULL)
1339 GNUNET_CLIENT_notify_transmit_ready (client,
1340 sizeof (struct SearchMessage),
1341 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1343 &transmit_download_request, dc);
1344 GNUNET_assert (dc->th != NULL);
1350 * Add entries to the pending list.
1352 * @param cls our download context
1354 * @param entry entry of type "struct DownloadRequest"
1358 retry_entry (void *cls, const GNUNET_HashCode * key, void *entry)
1360 struct GNUNET_FS_DownloadContext *dc = cls;
1361 struct DownloadRequest *dr = entry;
1365 GNUNET_CONTAINER_DLL_insert (dc->pending_head, dc->pending_tail, dr);
1366 dr->is_pending = GNUNET_YES;
1372 * We've lost our connection with the FS service.
1373 * Re-establish it and re-transmit all of our
1376 * @param dc download context that is having trouble
1379 try_reconnect (struct GNUNET_FS_DownloadContext *dc)
1382 if (NULL != dc->client)
1384 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1385 "Moving all requests back to pending list\n");
1388 GNUNET_CLIENT_notify_transmit_ready_cancel (dc->th);
1391 /* full reset of the pending list */
1392 dc->pending_head = NULL;
1393 dc->pending_tail = NULL;
1394 GNUNET_CONTAINER_multihashmap_iterate (dc->active, &retry_entry, dc);
1395 GNUNET_CLIENT_disconnect (dc->client, GNUNET_NO);
1396 dc->in_receive = GNUNET_NO;
1399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Will try to reconnect in 1s\n");
1401 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, &do_reconnect,
1407 * We're allowed to ask the FS service for our blocks. Start the download.
1409 * @param cls the 'struct GNUNET_FS_DownloadContext'
1410 * @param client handle to use for communcation with FS (we must destroy it!)
1413 activate_fs_download (void *cls, struct GNUNET_CLIENT_Connection *client)
1415 struct GNUNET_FS_DownloadContext *dc = cls;
1416 struct GNUNET_FS_ProgressInfo pi;
1418 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Download activated\n");
1419 GNUNET_assert (NULL != client);
1420 GNUNET_assert (dc->client == NULL);
1421 GNUNET_assert (dc->th == NULL);
1422 dc->client = client;
1423 pi.status = GNUNET_FS_STATUS_DOWNLOAD_ACTIVE;
1424 GNUNET_FS_download_make_status_ (&pi, dc);
1425 dc->pending_head = NULL;
1426 dc->pending_tail = NULL;
1427 GNUNET_CONTAINER_multihashmap_iterate (dc->active, &retry_entry, dc);
1428 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1429 "Asking for transmission to FS service\n");
1430 if (dc->pending_head != NULL)
1433 GNUNET_CLIENT_notify_transmit_ready (dc->client,
1434 sizeof (struct SearchMessage),
1435 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1437 &transmit_download_request, dc);
1438 GNUNET_assert (dc->th != NULL);
1444 * We must stop to ask the FS service for our blocks. Pause the download.
1446 * @param cls the 'struct GNUNET_FS_DownloadContext'
1449 deactivate_fs_download (void *cls)
1451 struct GNUNET_FS_DownloadContext *dc = cls;
1452 struct GNUNET_FS_ProgressInfo pi;
1454 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Download deactivated\n");
1457 GNUNET_CLIENT_notify_transmit_ready_cancel (dc->th);
1460 if (NULL != dc->client)
1462 GNUNET_CLIENT_disconnect (dc->client, GNUNET_NO);
1463 dc->in_receive = GNUNET_NO;
1466 dc->pending_head = NULL;
1467 dc->pending_tail = NULL;
1468 pi.status = GNUNET_FS_STATUS_DOWNLOAD_INACTIVE;
1469 GNUNET_FS_download_make_status_ (&pi, dc);
1474 * (recursively) Create a download request structure.
1476 * @param parent parent of the current entry
1477 * @param depth depth of the current entry, 0 are the DBLOCKs,
1478 * top level block is 'dc->treedepth - 1'
1479 * @param dr_offset offset in the original file this block maps to
1480 * (as in, offset of the first byte of the first DBLOCK
1481 * in the subtree rooted in the returned download request tree)
1482 * @param file_start_offset desired starting offset for the download
1483 * in the original file; requesting tree should not contain
1484 * DBLOCKs prior to the file_start_offset
1485 * @param desired_length desired number of bytes the user wanted to access
1486 * (from file_start_offset). Resulting tree should not contain
1487 * DBLOCKs after file_start_offset + file_length.
1488 * @return download request tree for the given range of DBLOCKs at
1489 * the specified depth
1491 static struct DownloadRequest *
1492 create_download_request (struct DownloadRequest *parent, unsigned int depth,
1493 uint64_t dr_offset, uint64_t file_start_offset,
1494 uint64_t desired_length)
1496 struct DownloadRequest *dr;
1498 unsigned int head_skip;
1499 uint64_t child_block_size;
1501 dr = GNUNET_malloc (sizeof (struct DownloadRequest));
1502 dr->parent = parent;
1504 dr->offset = dr_offset;
1507 child_block_size = GNUNET_FS_tree_compute_tree_size (depth - 1);
1509 /* calculate how many blocks at this level are not interesting
1510 * from the start (rounded down), either because of the requested
1511 * file offset or because this IBlock is further along */
1512 if (dr_offset < file_start_offset)
1513 head_skip = file_start_offset / child_block_size;
1515 head_skip = dr_offset / child_block_size;
1517 /* calculate index of last block at this level that is interesting (rounded up) */
1518 dr->num_children = file_start_offset + desired_length / child_block_size;
1519 if (dr->num_children * child_block_size <
1520 file_start_offset + desired_length)
1521 dr->num_children++; /* round up */
1523 /* now we can get the total number of children for this block */
1524 dr->num_children -= head_skip;
1525 if (dr->num_children > CHK_PER_INODE)
1526 dr->num_children = CHK_PER_INODE; /* cap at max */
1528 /* why else would we have gotten here to begin with? (that'd be a bad logic error) */
1529 GNUNET_assert (dr->num_children > 0);
1532 GNUNET_malloc (dr->num_children * sizeof (struct DownloadRequest *));
1533 for (i = 0; i < dr->num_children; i++)
1535 create_download_request (dr, depth - 1,
1536 dr_offset + i * child_block_size,
1537 file_start_offset, desired_length);
1544 * Continuation after a possible attempt to reconstruct
1545 * the current IBlock from the existing file.
1547 * @param cls the 'struct ReconstructContext'
1548 * @param tc scheduler context
1551 reconstruct_cont (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1553 struct GNUNET_FS_DownloadContext *dc = cls;
1555 /* clean up state from tree encoder */
1558 GNUNET_FS_tree_encoder_finish (dc->te, NULL, NULL);
1561 if (dc->task != GNUNET_SCHEDULER_NO_TASK)
1563 GNUNET_SCHEDULER_cancel (dc->task);
1564 dc->task = GNUNET_SCHEDULER_NO_TASK;
1566 if (dc->rfh != NULL)
1568 GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (dc->rfh));
1571 /* start "normal" download */
1572 schedule_block_download (dc, dc->top_request);
1577 * Task requesting the next block from the tree encoder.
1579 * @param cls the 'struct GNUJNET_FS_DownloadContext' we're processing
1580 * @param tc task context
1583 get_next_block (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1585 struct GNUNET_FS_DownloadContext *dc = cls;
1587 dc->task = GNUNET_SCHEDULER_NO_TASK;
1588 GNUNET_FS_tree_encoder_next (dc->te);
1594 * Function called asking for the current (encoded)
1595 * block to be processed. After processing the
1596 * client should either call "GNUNET_FS_tree_encode_next"
1597 * or (on error) "GNUNET_FS_tree_encode_finish".
1599 * This function checks if the content on disk matches
1600 * the expected content based on the URI.
1602 * @param cls closure
1603 * @param chk content hash key for the block
1604 * @param offset offset of the block
1605 * @param depth depth of the block, 0 for DBLOCK
1606 * @param type type of the block (IBLOCK or DBLOCK)
1607 * @param block the (encrypted) block
1608 * @param block_size size of block (in bytes)
1611 reconstruct_cb (void *cls, const struct ContentHashKey *chk, uint64_t offset,
1612 unsigned int depth, enum GNUNET_BLOCK_Type type,
1613 const void *block, uint16_t block_size)
1615 struct GNUNET_FS_DownloadContext *dc = cls;
1616 struct GNUNET_FS_ProgressInfo pi;
1617 struct DownloadRequest *dr;
1621 /* find corresponding request entry */
1622 dr = dc->top_request;
1623 while (dr->depth > depth)
1625 blen = GNUNET_FS_tree_compute_tree_size (dr->depth);
1626 chld = (offset - dr->offset) / blen;
1627 GNUNET_assert (chld < dr->num_children);
1628 dr = dr->children[chld];
1630 /* FIXME: this code needs more testing and might
1631 need to handle more states... */
1636 case BRS_RECONSTRUCT_DOWN:
1638 case BRS_RECONSTRUCT_META_UP:
1640 case BRS_RECONSTRUCT_UP:
1643 if (0 == memcmp (chk, &dr->chk, sizeof (struct ContentHashKey)))
1645 /* block matches, hence tree below matches;
1646 * this request is done! */
1647 dr->state = BRS_DOWNLOAD_UP;
1648 GNUNET_break (GNUNET_NO ==
1649 GNUNET_CONTAINER_multihashmap_remove (dc->active, &dr->chk.query, dr));
1650 if (GNUNET_YES == dr->is_pending)
1652 GNUNET_break (0); /* how did we get here? */
1653 GNUNET_CONTAINER_DLL_remove (dc->pending_head, dc->pending_tail, dr);
1654 dr->is_pending = GNUNET_NO;
1656 /* calculate how many bytes of payload this block
1658 blen = GNUNET_FS_tree_compute_tree_size (dr->depth);
1659 /* how many of those bytes are in the requested range? */
1660 blen = GNUNET_MIN (blen, dc->length + dc->offset - dr->offset);
1661 /* signal progress */
1662 dc->completed += blen;
1663 pi.status = GNUNET_FS_STATUS_DOWNLOAD_PROGRESS;
1664 pi.value.download.specifics.progress.data = NULL;
1665 pi.value.download.specifics.progress.offset = offset;
1666 pi.value.download.specifics.progress.data_len = 0;
1667 pi.value.download.specifics.progress.depth = 0;
1668 pi.value.download.specifics.progress.trust_offered = 0;
1669 GNUNET_FS_download_make_status_ (&pi, dc);
1670 /* FIXME: duplicated code from 'process_result_with_request - refactor */
1671 if (dc->completed == dc->length)
1673 /* download completed, signal */
1674 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1675 "Download completed, truncating file to desired length %llu\n",
1676 (unsigned long long) GNUNET_ntohll (dc->uri->data.
1678 /* truncate file to size (since we store IBlocks at the end) */
1679 if (dc->filename != NULL)
1682 truncate (dc->filename,
1683 GNUNET_ntohll (dc->uri->data.chk.file_length)))
1684 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "truncate",
1690 case BRS_DOWNLOAD_DOWN:
1692 case BRS_DOWNLOAD_UP:
1700 if ((dr == dc->top_request) && (dr->state == BRS_DOWNLOAD_UP))
1702 check_completed (dc);
1705 dc->task = GNUNET_SCHEDULER_add_now (&get_next_block, dc);
1710 * Function called by the tree encoder to obtain a block of plaintext
1711 * data (for the lowest level of the tree).
1713 * @param cls our 'struct ReconstructContext'
1714 * @param offset identifies which block to get
1715 * @param max (maximum) number of bytes to get; returning
1716 * fewer will also cause errors
1717 * @param buf where to copy the plaintext buffer
1718 * @param emsg location to store an error message (on error)
1719 * @return number of bytes copied to buf, 0 on error
1722 fh_reader (void *cls, uint64_t offset, size_t max, void *buf, char **emsg)
1724 struct GNUNET_FS_DownloadContext *dc = cls;
1725 struct GNUNET_DISK_FileHandle *fh = dc->rfh;
1729 if (offset != GNUNET_DISK_file_seek (fh, offset, GNUNET_DISK_SEEK_SET))
1731 *emsg = GNUNET_strdup (strerror (errno));
1734 ret = GNUNET_DISK_file_read (fh, buf, max);
1737 *emsg = GNUNET_strdup (strerror (errno));
1745 * Task that creates the initial (top-level) download
1746 * request for the file.
1748 * @param cls the 'struct GNUNET_FS_DownloadContext'
1749 * @param tc scheduler context
1752 GNUNET_FS_download_start_task_ (void *cls,
1753 const struct GNUNET_SCHEDULER_TaskContext *tc)
1755 struct GNUNET_FS_DownloadContext *dc = cls;
1756 struct GNUNET_FS_ProgressInfo pi;
1757 struct GNUNET_DISK_FileHandle *fh;
1759 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Start task running...\n");
1760 dc->task = GNUNET_SCHEDULER_NO_TASK;
1761 if (dc->length == 0)
1763 /* no bytes required! */
1764 if (dc->filename != NULL)
1766 fh = GNUNET_DISK_file_open (dc->filename,
1767 GNUNET_DISK_OPEN_READWRITE |
1768 GNUNET_DISK_OPEN_CREATE |
1770 GNUNET_FS_uri_chk_get_file_size (dc->uri)) ?
1771 GNUNET_DISK_OPEN_TRUNCATE : 0),
1772 GNUNET_DISK_PERM_USER_READ |
1773 GNUNET_DISK_PERM_USER_WRITE |
1774 GNUNET_DISK_PERM_GROUP_READ |
1775 GNUNET_DISK_PERM_OTHER_READ);
1776 GNUNET_DISK_file_close (fh);
1778 GNUNET_FS_download_sync_ (dc);
1779 pi.status = GNUNET_FS_STATUS_DOWNLOAD_START;
1780 pi.value.download.specifics.start.meta = dc->meta;
1781 GNUNET_FS_download_make_status_ (&pi, dc);
1782 check_completed (dc);
1785 if (dc->emsg != NULL)
1787 if (dc->top_request == NULL)
1790 create_download_request (NULL, dc->treedepth - 1, 0, dc->offset,
1792 dc->top_request->state = BRS_CHK_SET;
1793 dc->top_request->chk =
1795 chk) ? dc->uri->data.chk.chk : dc->uri->data.loc.fi.chk;
1797 GNUNET_FS_download_sync_ (dc);
1798 if (NULL != dc->search)
1799 GNUNET_FS_search_result_sync_ (dc->search);
1800 pi.status = GNUNET_FS_STATUS_DOWNLOAD_START;
1801 pi.value.download.specifics.start.meta = dc->meta;
1802 GNUNET_FS_download_make_status_ (&pi, dc);
1804 GNUNET_FS_download_start_downloading_ (dc);
1805 /* attempt reconstruction from disk */
1806 if (GNUNET_YES == GNUNET_DISK_file_test (dc->filename))
1808 GNUNET_DISK_file_open (dc->filename, GNUNET_DISK_OPEN_READ,
1809 GNUNET_DISK_PERM_NONE);
1810 if (dc->top_request->state == BRS_CHK_SET)
1812 if (dc->rfh != NULL)
1814 /* first, try top-down */
1815 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1816 "Trying top-down reconstruction for `%s'\n", dc->filename);
1817 try_top_down_reconstruction (dc, dc->top_request);
1818 switch (dc->top_request->state)
1822 case BRS_DOWNLOAD_DOWN:
1823 break; /* normal, some blocks already down */
1824 case BRS_DOWNLOAD_UP:
1825 /* already done entirely, party! */
1826 if (dc->rfh != NULL)
1828 /* avoid hanging on to file handle longer than
1830 GNUNET_DISK_file_close (dc->rfh);
1835 GNUNET_asprintf (&dc->emsg, _("Invalid URI"));
1836 GNUNET_FS_download_sync_ (dc);
1837 pi.status = GNUNET_FS_STATUS_DOWNLOAD_ERROR;
1838 pi.value.download.specifics.error.message = dc->emsg;
1839 GNUNET_FS_download_make_status_ (&pi, dc);
1847 /* attempt reconstruction from meta data */
1848 if ((GNUNET_FS_uri_chk_get_file_size (dc->uri) <= MAX_INLINE_SIZE) &&
1851 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1852 "Trying to find embedded meta data for download of size %llu with %u bytes MD\n",
1853 (unsigned long long) GNUNET_FS_uri_chk_get_file_size (dc->uri),
1855 GNUNET_CONTAINER_meta_data_get_serialized_size (dc->meta));
1856 GNUNET_CONTAINER_meta_data_iterate (dc->meta, &match_full_data, dc);
1857 if (dc->top_request->state == BRS_DOWNLOAD_UP)
1859 if (dc->rfh != NULL)
1861 /* avoid hanging on to file handle longer than
1863 GNUNET_DISK_file_close (dc->rfh);
1866 return; /* finished, status update was already done for us */
1869 if (dc->rfh != NULL)
1871 /* finally, try bottom-up */
1872 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1873 "Trying bottom-up reconstruction of file `%s'\n", dc->filename);
1875 GNUNET_FS_tree_encoder_create (dc->h, dc->old_file_size, dc, &fh_reader,
1876 &reconstruct_cb, NULL,
1878 dc->task = GNUNET_SCHEDULER_add_now (&get_next_block, dc);
1882 /* simple, top-level download */
1883 schedule_block_download (dc, dc->top_request);
1885 if (dc->top_request->state == BRS_DOWNLOAD_UP)
1886 check_completed (dc);
1891 * Create SUSPEND event for the given download operation
1892 * and then clean up our state (without stop signal).
1894 * @param cls the 'struct GNUNET_FS_DownloadContext' to signal for
1897 GNUNET_FS_download_signal_suspend_ (void *cls)
1899 struct GNUNET_FS_DownloadContext *dc = cls;
1900 struct GNUNET_FS_ProgressInfo pi;
1902 if (dc->top != NULL)
1903 GNUNET_FS_end_top (dc->h, dc->top);
1904 while (NULL != dc->child_head)
1905 GNUNET_FS_download_signal_suspend_ (dc->child_head);
1906 if (dc->search != NULL)
1908 dc->search->download = NULL;
1911 if (dc->job_queue != NULL)
1913 GNUNET_FS_dequeue_ (dc->job_queue);
1914 dc->job_queue = NULL;
1916 if (dc->parent != NULL)
1917 GNUNET_CONTAINER_DLL_remove (dc->parent->child_head, dc->parent->child_tail,
1919 if (dc->task != GNUNET_SCHEDULER_NO_TASK)
1921 GNUNET_SCHEDULER_cancel (dc->task);
1922 dc->task = GNUNET_SCHEDULER_NO_TASK;
1924 pi.status = GNUNET_FS_STATUS_DOWNLOAD_SUSPEND;
1925 GNUNET_FS_download_make_status_ (&pi, dc);
1928 GNUNET_FS_tree_encoder_finish (dc->te, NULL, NULL);
1931 if (dc->rfh != NULL)
1933 GNUNET_DISK_file_close (dc->rfh);
1936 GNUNET_FS_free_download_request_ (dc->top_request);
1937 if (dc->active != NULL)
1939 GNUNET_CONTAINER_multihashmap_destroy (dc->active);
1942 GNUNET_free_non_null (dc->filename);
1943 GNUNET_CONTAINER_meta_data_destroy (dc->meta);
1944 GNUNET_FS_uri_destroy (dc->uri);
1945 GNUNET_free_non_null (dc->temp_filename);
1946 GNUNET_free_non_null (dc->serialization);
1952 * Download parts of a file. Note that this will store
1953 * the blocks at the respective offset in the given file. Also, the
1954 * download is still using the blocking of the underlying FS
1955 * encoding. As a result, the download may *write* outside of the
1956 * given boundaries (if offset and length do not match the 32k FS
1957 * block boundaries). <p>
1959 * This function should be used to focus a download towards a
1960 * particular portion of the file (optimization), not to strictly
1961 * limit the download to exactly those bytes.
1963 * @param h handle to the file sharing subsystem
1964 * @param uri the URI of the file (determines what to download); CHK or LOC URI
1965 * @param meta known metadata for the file (can be NULL)
1966 * @param filename where to store the file, maybe NULL (then no file is
1967 * created on disk and data must be grabbed from the callbacks)
1968 * @param tempname where to store temporary file data, not used if filename is non-NULL;
1969 * can be NULL (in which case we will pick a name if needed); the temporary file
1970 * may already exist, in which case we will try to use the data that is there and
1971 * if it is not what is desired, will overwrite it
1972 * @param offset at what offset should we start the download (typically 0)
1973 * @param length how many bytes should be downloaded starting at offset
1974 * @param anonymity anonymity level to use for the download
1975 * @param options various options
1976 * @param cctx initial value for the client context for this download
1977 * @param parent parent download to associate this download with (use NULL
1978 * for top-level downloads; useful for manually-triggered recursive downloads)
1979 * @return context that can be used to control this download
1981 struct GNUNET_FS_DownloadContext *
1982 GNUNET_FS_download_start (struct GNUNET_FS_Handle *h,
1983 const struct GNUNET_FS_Uri *uri,
1984 const struct GNUNET_CONTAINER_MetaData *meta,
1985 const char *filename, const char *tempname,
1986 uint64_t offset, uint64_t length, uint32_t anonymity,
1987 enum GNUNET_FS_DownloadOptions options, void *cctx,
1988 struct GNUNET_FS_DownloadContext *parent)
1990 struct GNUNET_FS_DownloadContext *dc;
1992 GNUNET_assert (GNUNET_FS_uri_test_chk (uri) || GNUNET_FS_uri_test_loc (uri));
1994 if ((offset + length < offset) ||
1995 (offset + length > GNUNET_FS_uri_chk_get_file_size (uri)))
2000 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Starting download `%s' of %llu bytes\n",
2001 filename, (unsigned long long) length);
2002 dc = GNUNET_malloc (sizeof (struct GNUNET_FS_DownloadContext));
2004 dc->parent = parent;
2007 GNUNET_CONTAINER_DLL_insert (parent->child_head, parent->child_tail, dc);
2009 dc->uri = GNUNET_FS_uri_dup (uri);
2010 dc->meta = GNUNET_CONTAINER_meta_data_duplicate (meta);
2011 dc->client_info = cctx;
2012 dc->start_time = GNUNET_TIME_absolute_get ();
2013 if (NULL != filename)
2015 dc->filename = GNUNET_strdup (filename);
2016 if (GNUNET_YES == GNUNET_DISK_file_test (filename))
2017 GNUNET_DISK_file_size (filename, &dc->old_file_size, GNUNET_YES);
2019 if (GNUNET_FS_uri_test_loc (dc->uri))
2020 GNUNET_assert (GNUNET_OK ==
2021 GNUNET_FS_uri_loc_get_peer_identity (dc->uri, &dc->target));
2022 dc->offset = offset;
2023 dc->length = length;
2024 dc->anonymity = anonymity;
2025 dc->options = options;
2027 GNUNET_CONTAINER_multihashmap_create (1 + 2 * (length / DBLOCK_SIZE));
2029 GNUNET_FS_compute_depth (GNUNET_FS_uri_chk_get_file_size (dc->uri));
2030 if ((filename == NULL) && (is_recursive_download (dc)))
2032 if (tempname != NULL)
2033 dc->temp_filename = GNUNET_strdup (tempname);
2035 dc->temp_filename = GNUNET_DISK_mktemp ("gnunet-directory-download-tmp");
2038 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Download tree has depth %u\n",
2043 GNUNET_FS_make_top (dc->h, &GNUNET_FS_download_signal_suspend_, dc);
2045 dc->task = GNUNET_SCHEDULER_add_now (&GNUNET_FS_download_start_task_, dc);
2051 * Download parts of a file based on a search result. The download
2052 * will be associated with the search result (and the association
2053 * will be preserved when serializing/deserializing the state).
2054 * If the search is stopped, the download will not be aborted but
2055 * be 'promoted' to a stand-alone download.
2057 * As with the other download function, this will store
2058 * the blocks at the respective offset in the given file. Also, the
2059 * download is still using the blocking of the underlying FS
2060 * encoding. As a result, the download may *write* outside of the
2061 * given boundaries (if offset and length do not match the 32k FS
2062 * block boundaries). <p>
2064 * The given range can be used to focus a download towards a
2065 * particular portion of the file (optimization), not to strictly
2066 * limit the download to exactly those bytes.
2068 * @param h handle to the file sharing subsystem
2069 * @param sr the search result to use for the download (determines uri and
2070 * meta data and associations)
2071 * @param filename where to store the file, maybe NULL (then no file is
2072 * created on disk and data must be grabbed from the callbacks)
2073 * @param tempname where to store temporary file data, not used if filename is non-NULL;
2074 * can be NULL (in which case we will pick a name if needed); the temporary file
2075 * may already exist, in which case we will try to use the data that is there and
2076 * if it is not what is desired, will overwrite it
2077 * @param offset at what offset should we start the download (typically 0)
2078 * @param length how many bytes should be downloaded starting at offset
2079 * @param anonymity anonymity level to use for the download
2080 * @param options various download options
2081 * @param cctx initial value for the client context for this download
2082 * @return context that can be used to control this download
2084 struct GNUNET_FS_DownloadContext *
2085 GNUNET_FS_download_start_from_search (struct GNUNET_FS_Handle *h,
2086 struct GNUNET_FS_SearchResult *sr,
2087 const char *filename,
2088 const char *tempname, uint64_t offset,
2089 uint64_t length, uint32_t anonymity,
2090 enum GNUNET_FS_DownloadOptions options,
2093 struct GNUNET_FS_DownloadContext *dc;
2095 if ((sr == NULL) || (sr->download != NULL))
2100 GNUNET_assert (GNUNET_FS_uri_test_chk (sr->uri) ||
2101 GNUNET_FS_uri_test_loc (sr->uri));
2102 if ((offset + length < offset) ||
2103 (offset + length > sr->uri->data.chk.file_length))
2108 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Starting download `%s' of %llu bytes\n",
2109 filename, (unsigned long long) length);
2110 dc = GNUNET_malloc (sizeof (struct GNUNET_FS_DownloadContext));
2114 if (sr->probe_ctx != NULL)
2116 GNUNET_FS_download_stop (sr->probe_ctx, GNUNET_YES);
2117 sr->probe_ctx = NULL;
2119 dc->uri = GNUNET_FS_uri_dup (sr->uri);
2120 dc->meta = GNUNET_CONTAINER_meta_data_duplicate (sr->meta);
2121 dc->client_info = cctx;
2122 dc->start_time = GNUNET_TIME_absolute_get ();
2123 if (NULL != filename)
2125 dc->filename = GNUNET_strdup (filename);
2126 if (GNUNET_YES == GNUNET_DISK_file_test (filename))
2127 GNUNET_DISK_file_size (filename, &dc->old_file_size, GNUNET_YES);
2129 if (GNUNET_FS_uri_test_loc (dc->uri))
2130 GNUNET_assert (GNUNET_OK ==
2131 GNUNET_FS_uri_loc_get_peer_identity (dc->uri, &dc->target));
2132 dc->offset = offset;
2133 dc->length = length;
2134 dc->anonymity = anonymity;
2135 dc->options = options;
2137 GNUNET_CONTAINER_multihashmap_create (1 + 2 * (length / DBLOCK_SIZE));
2139 GNUNET_FS_compute_depth (GNUNET_ntohll (dc->uri->data.chk.file_length));
2140 if ((filename == NULL) && (is_recursive_download (dc)))
2142 if (tempname != NULL)
2143 dc->temp_filename = GNUNET_strdup (tempname);
2145 dc->temp_filename = GNUNET_DISK_mktemp ("gnunet-directory-download-tmp");
2148 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Download tree has depth %u\n",
2150 dc->task = GNUNET_SCHEDULER_add_now (&GNUNET_FS_download_start_task_, dc);
2156 * Start the downloading process (by entering the queue).
2158 * @param dc our download context
2161 GNUNET_FS_download_start_downloading_ (struct GNUNET_FS_DownloadContext *dc)
2163 if (dc->completed == dc->length)
2165 GNUNET_assert (dc->job_queue == NULL);
2167 GNUNET_FS_queue_ (dc->h, &activate_fs_download, &deactivate_fs_download,
2168 dc, (dc->length + DBLOCK_SIZE - 1) / DBLOCK_SIZE);
2173 * Stop a download (aborts if download is incomplete).
2175 * @param dc handle for the download
2176 * @param do_delete delete files of incomplete downloads
2179 GNUNET_FS_download_stop (struct GNUNET_FS_DownloadContext *dc, int do_delete)
2181 struct GNUNET_FS_ProgressInfo pi;
2184 if (dc->top != NULL)
2185 GNUNET_FS_end_top (dc->h, dc->top);
2188 if (dc->task != GNUNET_SCHEDULER_NO_TASK)
2190 GNUNET_SCHEDULER_cancel (dc->task);
2191 dc->task = GNUNET_SCHEDULER_NO_TASK;
2193 if (dc->search != NULL)
2195 dc->search->download = NULL;
2196 GNUNET_FS_search_result_sync_ (dc->search);
2199 if (dc->job_queue != NULL)
2201 GNUNET_FS_dequeue_ (dc->job_queue);
2202 dc->job_queue = NULL;
2206 GNUNET_FS_tree_encoder_finish (dc->te, NULL, NULL);
2209 have_children = (NULL != dc->child_head) ? GNUNET_YES : GNUNET_NO;
2210 while (NULL != dc->child_head)
2211 GNUNET_FS_download_stop (dc->child_head, do_delete);
2212 if (dc->parent != NULL)
2213 GNUNET_CONTAINER_DLL_remove (dc->parent->child_head, dc->parent->child_tail,
2215 if (dc->serialization != NULL)
2216 GNUNET_FS_remove_sync_file_ (dc->h,
2217 ((dc->parent != NULL) ||
2219 NULL)) ? GNUNET_FS_SYNC_PATH_CHILD_DOWNLOAD :
2220 GNUNET_FS_SYNC_PATH_MASTER_DOWNLOAD,
2222 if ((GNUNET_YES == have_children) && (dc->parent == NULL))
2223 GNUNET_FS_remove_sync_dir_ (dc->h,
2225 NULL) ? GNUNET_FS_SYNC_PATH_CHILD_DOWNLOAD :
2226 GNUNET_FS_SYNC_PATH_MASTER_DOWNLOAD,
2228 pi.status = GNUNET_FS_STATUS_DOWNLOAD_STOPPED;
2229 GNUNET_FS_download_make_status_ (&pi, dc);
2230 GNUNET_FS_free_download_request_ (dc->top_request);
2231 dc->top_request = NULL;
2232 if (dc->active != NULL)
2234 GNUNET_CONTAINER_multihashmap_destroy (dc->active);
2237 if (dc->filename != NULL)
2239 if ((dc->completed != dc->length) && (GNUNET_YES == do_delete))
2241 if (0 != UNLINK (dc->filename))
2242 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "unlink",
2245 GNUNET_free (dc->filename);
2247 GNUNET_CONTAINER_meta_data_destroy (dc->meta);
2248 GNUNET_FS_uri_destroy (dc->uri);
2249 if (NULL != dc->temp_filename)
2251 if (0 != UNLINK (dc->temp_filename))
2252 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, "unlink",
2254 GNUNET_free (dc->temp_filename);
2256 GNUNET_free_non_null (dc->serialization);
2260 /* end of fs_download.c */