2 This file is part of GNUnet.
3 (C) 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009, 2010 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
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
21 * @file fs/fs_download.c
22 * @brief download methods
23 * @author Christian Grothoff
26 * - location URI suppport (can wait, easy)
27 * - different priority for scheduling probe downloads?
28 * - check if iblocks can be computed from existing blocks (can wait, hard)
31 #include "gnunet_constants.h"
32 #include "gnunet_fs_service.h"
36 #define DEBUG_DOWNLOAD GNUNET_NO
39 * Determine if the given download (options and meta data) should cause
40 * use to try to do a recursive download.
43 is_recursive_download (struct GNUNET_FS_DownloadContext *dc)
45 return (0 != (dc->options & GNUNET_FS_DOWNLOAD_OPTION_RECURSIVE)) &&
46 ( (GNUNET_YES == GNUNET_FS_meta_data_test_for_directory (dc->meta)) ||
47 ( (dc->meta == NULL) &&
48 ( (NULL == dc->filename) ||
49 ( (strlen (dc->filename) >= strlen (GNUNET_FS_DIRECTORY_EXT)) &&
51 strstr (dc->filename + strlen(dc->filename) - strlen(GNUNET_FS_DIRECTORY_EXT),
52 GNUNET_FS_DIRECTORY_EXT)) ) ) ) );
57 * We're storing the IBLOCKS after the DBLOCKS on disk (so that we
58 * only have to truncate the file once we're done).
60 * Given the offset of a block (with respect to the DBLOCKS) and its
61 * depth, return the offset where we would store this block in the
64 * @param fsize overall file size
65 * @param off offset of the block in the file
66 * @param depth depth of the block in the tree
67 * @param treedepth maximum depth of the tree
68 * @return off for DBLOCKS (depth == treedepth),
69 * otherwise an offset past the end
70 * of the file that does not overlap
71 * with the range for any other block
74 compute_disk_offset (uint64_t fsize,
77 unsigned int treedepth)
80 uint64_t lsize; /* what is the size of all IBlocks for depth "i"? */
81 uint64_t loff; /* where do IBlocks for depth "i" start? */
82 unsigned int ioff; /* which IBlock corresponds to "off" at depth "i"? */
84 if (depth == treedepth)
86 /* first IBlocks start at the end of file, rounded up
87 to full DBLOCK_SIZE */
88 loff = ((fsize + DBLOCK_SIZE - 1) / DBLOCK_SIZE) * DBLOCK_SIZE;
89 lsize = ( (fsize + DBLOCK_SIZE-1) / DBLOCK_SIZE) * sizeof (struct ContentHashKey);
90 GNUNET_assert (0 == (off % DBLOCK_SIZE));
91 ioff = (off / DBLOCK_SIZE);
92 for (i=treedepth-1;i>depth;i--)
95 lsize = (lsize + CHK_PER_INODE - 1) / CHK_PER_INODE;
96 GNUNET_assert (lsize > 0);
97 GNUNET_assert (0 == (ioff % CHK_PER_INODE));
98 ioff /= CHK_PER_INODE;
100 return loff + ioff * sizeof (struct ContentHashKey);
105 * Given a file of the specified treedepth and a block at the given
106 * offset and depth, calculate the offset for the CHK at the given
109 * @param offset the offset of the first
110 * DBLOCK in the subtree of the
112 * @param depth the depth of the IBLOCK in the tree
113 * @param treedepth overall depth of the tree
114 * @param k which CHK in the IBLOCK are we
116 * @return offset if k=0, otherwise an appropriately
117 * larger value (i.e., if depth = treedepth-1,
118 * the returned value should be offset+DBLOCK_SIZE)
121 compute_dblock_offset (uint64_t offset,
123 unsigned int treedepth,
127 uint64_t lsize; /* what is the size of the sum of all DBlocks
128 that a CHK at depth i corresponds to? */
130 if (depth == treedepth)
133 for (i=treedepth-1;i>depth;i--)
134 lsize *= CHK_PER_INODE;
135 return offset + k * lsize;
140 * Fill in all of the generic fields for a download event and call the
143 * @param pi structure to fill in
144 * @param dc overall download context
147 GNUNET_FS_download_make_status_ (struct GNUNET_FS_ProgressInfo *pi,
148 struct GNUNET_FS_DownloadContext *dc)
150 pi->value.download.dc = dc;
151 pi->value.download.cctx
153 pi->value.download.pctx
154 = (dc->parent == NULL) ? NULL : dc->parent->client_info;
155 pi->value.download.sctx
156 = (dc->search == NULL) ? NULL : dc->search->client_info;
157 pi->value.download.uri
159 pi->value.download.filename
161 pi->value.download.size
163 pi->value.download.duration
164 = GNUNET_TIME_absolute_get_duration (dc->start_time);
165 pi->value.download.completed
167 pi->value.download.anonymity
169 pi->value.download.eta
170 = GNUNET_TIME_calculate_eta (dc->start_time,
173 if (0 == (dc->options & GNUNET_FS_DOWNLOAD_IS_PROBE))
174 dc->client_info = dc->h->upcb (dc->h->upcb_cls,
177 dc->client_info = GNUNET_FS_search_probe_progress_ (NULL,
182 * We're ready to transmit a search request to the
183 * file-sharing service. Do it. If there is
184 * more than one request pending, try to send
185 * multiple or request another transmission.
188 * @param size number of bytes available in buf
189 * @param buf where the callee should write the message
190 * @return number of bytes written to buf
193 transmit_download_request (void *cls,
199 * Closure for iterator processing results.
201 struct ProcessResultClosure
207 GNUNET_HashCode query;
210 * Data found in P2P network.
215 * Our download context.
217 struct GNUNET_FS_DownloadContext *dc;
220 * Number of bytes in data.
227 enum GNUNET_BLOCK_Type type;
230 * Flag to indicate if this block should be stored on disk.
238 * Iterator over entries in the pending requests in the 'active' map for the
239 * reply that we just got.
241 * @param cls closure (our 'struct ProcessResultClosure')
242 * @param key query for the given value / request
243 * @param value value in the hash map (a 'struct DownloadRequest')
244 * @return GNUNET_YES (we should continue to iterate); unless serious error
247 process_result_with_request (void *cls,
248 const GNUNET_HashCode * key,
254 * Schedule the download of the specified block in the tree.
256 * @param dc overall download this block belongs to
257 * @param chk content-hash-key of the block
258 * @param offset offset of the block in the file
259 * (for IBlocks, the offset is the lowest
260 * offset of any DBlock in the subtree under
262 * @param depth depth of the block, 0 is the root of the tree
265 schedule_block_download (struct GNUNET_FS_DownloadContext *dc,
266 const struct ContentHashKey *chk,
270 struct DownloadRequest *sm;
274 char block[DBLOCK_SIZE];
276 struct ProcessResultClosure prc;
277 struct GNUNET_DISK_FileHandle *fh;
280 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
281 "Scheduling download at offset %llu and depth %u for `%s'\n",
282 (unsigned long long) offset,
284 GNUNET_h2s (&chk->query));
286 total = GNUNET_ntohll (dc->uri->data.chk.file_length);
287 off = compute_disk_offset (total,
291 len = GNUNET_FS_tree_calculate_block_size (total,
295 sm = GNUNET_malloc (sizeof (struct DownloadRequest));
299 sm->is_pending = GNUNET_YES;
300 sm->next = dc->pending;
302 GNUNET_CONTAINER_multihashmap_put (dc->active,
305 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
307 if ( (dc->old_file_size > off) &&
308 (dc->filename != NULL) )
309 fh = GNUNET_DISK_file_open (dc->filename,
310 GNUNET_DISK_OPEN_READ,
311 GNUNET_DISK_PERM_NONE);
314 GNUNET_DISK_file_seek (fh,
316 GNUNET_DISK_SEEK_SET) ) &&
318 GNUNET_DISK_file_read (fh,
322 GNUNET_CRYPTO_hash (block, len, &key);
323 if (0 == memcmp (&key,
325 sizeof (GNUNET_HashCode)))
328 struct GNUNET_CRYPTO_AesSessionKey sk;
329 struct GNUNET_CRYPTO_AesInitializationVector iv;
330 GNUNET_HashCode query;
332 GNUNET_CRYPTO_hash_to_aes_key (&key, &sk, &iv);
333 GNUNET_CRYPTO_aes_encrypt (block, len,
337 GNUNET_CRYPTO_hash (enc, len, &query);
338 if (0 == memcmp (&query,
340 sizeof (GNUNET_HashCode)))
343 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
344 "Matching block already present, no need for download!\n");
346 /* already got it! */
350 prc.type = (dc->treedepth == depth)
351 ? GNUNET_BLOCK_TYPE_DBLOCK
352 : GNUNET_BLOCK_TYPE_IBLOCK;
353 prc.query = chk->query;
354 prc.do_store = GNUNET_NO; /* useless */
355 process_result_with_request (&prc,
363 GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
368 GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
369 if (depth < dc->treedepth)
371 // FIXME: try if we could
372 // reconstitute this IBLOCK
373 // from the existing blocks on disk (can wait)
374 // (read block(s), encode, compare with
375 // query; if matches, simply return)
378 if ( (dc->th == NULL) &&
379 (dc->client != NULL) )
382 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
383 "Asking for transmission to FS service\n");
385 dc->th = GNUNET_CLIENT_notify_transmit_ready (dc->client,
386 sizeof (struct SearchMessage),
387 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
389 &transmit_download_request,
397 * Suggest a filename based on given metadata.
399 * @param md given meta data
400 * @return NULL if meta data is useless for suggesting a filename
403 GNUNET_FS_meta_data_suggest_filename (const struct GNUNET_CONTAINER_MetaData *md)
405 static const char *mimeMap[][2] = {
406 {"application/bz2", ".bz2"},
407 {"application/gnunet-directory", ".gnd"},
408 {"application/java", ".class"},
409 {"application/msword", ".doc"},
410 {"application/ogg", ".ogg"},
411 {"application/pdf", ".pdf"},
412 {"application/pgp-keys", ".key"},
413 {"application/pgp-signature", ".pgp"},
414 {"application/postscript", ".ps"},
415 {"application/rar", ".rar"},
416 {"application/rtf", ".rtf"},
417 {"application/xml", ".xml"},
418 {"application/x-debian-package", ".deb"},
419 {"application/x-dvi", ".dvi"},
420 {"applixation/x-flac", ".flac"},
421 {"applixation/x-gzip", ".gz"},
422 {"application/x-java-archive", ".jar"},
423 {"application/x-java-vm", ".class"},
424 {"application/x-python-code", ".pyc"},
425 {"application/x-redhat-package-manager", ".rpm"},
426 {"application/x-rpm", ".rpm"},
427 {"application/x-tar", ".tar"},
428 {"application/x-tex-pk", ".pk"},
429 {"application/x-texinfo", ".texinfo"},
430 {"application/x-xcf", ".xcf"},
431 {"application/x-xfig", ".xfig"},
432 {"application/zip", ".zip"},
434 {"audio/midi", ".midi"},
435 {"audio/mpeg", ".mp3"},
436 {"audio/real", ".rm"},
437 {"audio/x-wav", ".wav"},
439 {"image/gif", ".gif"},
440 {"image/jpeg", ".jpg"},
441 {"image/pcx", ".pcx"},
442 {"image/png", ".png"},
443 {"image/tiff", ".tiff"},
444 {"image/x-ms-bmp", ".bmp"},
445 {"image/x-xpixmap", ".xpm"},
447 {"text/css", ".css"},
448 {"text/html", ".html"},
449 {"text/plain", ".txt"},
450 {"text/rtf", ".rtf"},
451 {"text/x-c++hdr", ".h++"},
452 {"text/x-c++src", ".c++"},
453 {"text/x-chdr", ".h"},
454 {"text/x-csrc", ".c"},
455 {"text/x-java", ".java"},
456 {"text/x-moc", ".moc"},
457 {"text/x-pascal", ".pas"},
458 {"text/x-perl", ".pl"},
459 {"text/x-python", ".py"},
460 {"text/x-tex", ".tex"},
462 {"video/avi", ".avi"},
463 {"video/mpeg", ".mpeg"},
464 {"video/quicktime", ".qt"},
465 {"video/real", ".rm"},
466 {"video/x-msvideo", ".avi"},
475 ret = GNUNET_CONTAINER_meta_data_get_by_type (md,
476 EXTRACTOR_METATYPE_FILENAME);
480 mime = GNUNET_CONTAINER_meta_data_get_by_type (md,
481 EXTRACTOR_METATYPE_MIMETYPE);
485 while ( (mimeMap[i][0] != NULL) &&
486 (0 != strcmp (mime, mimeMap[i][0])))
488 if (mimeMap[i][1] == NULL)
489 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG |
490 GNUNET_ERROR_TYPE_BULK,
491 _("Did not find mime type `%s' in extension list.\n"),
497 base = GNUNET_CONTAINER_meta_data_get_first_by_types (md,
498 EXTRACTOR_METATYPE_TITLE,
499 EXTRACTOR_METATYPE_BOOK_TITLE,
500 EXTRACTOR_METATYPE_ORIGINAL_TITLE,
501 EXTRACTOR_METATYPE_PACKAGE_NAME,
502 EXTRACTOR_METATYPE_URL,
503 EXTRACTOR_METATYPE_URI,
504 EXTRACTOR_METATYPE_DESCRIPTION,
505 EXTRACTOR_METATYPE_ISRC,
506 EXTRACTOR_METATYPE_JOURNAL_NAME,
507 EXTRACTOR_METATYPE_AUTHOR_NAME,
508 EXTRACTOR_METATYPE_SUBJECT,
509 EXTRACTOR_METATYPE_ALBUM,
510 EXTRACTOR_METATYPE_ARTIST,
511 EXTRACTOR_METATYPE_KEYWORDS,
512 EXTRACTOR_METATYPE_COMMENT,
513 EXTRACTOR_METATYPE_UNKNOWN,
515 if ( (base == NULL) &&
519 return GNUNET_strdup (ext);
522 GNUNET_asprintf (&ret,
532 * We've lost our connection with the FS service.
533 * Re-establish it and re-transmit all of our
536 * @param dc download context that is having trouble
539 try_reconnect (struct GNUNET_FS_DownloadContext *dc);
543 * We found an entry in a directory. Check if the respective child
544 * already exists and if not create the respective child download.
546 * @param cls the parent download
547 * @param filename name of the file in the directory
548 * @param uri URI of the file (CHK or LOC)
549 * @param meta meta data of the file
550 * @param length number of bytes in data
551 * @param data contents of the file (or NULL if they were not inlined)
554 trigger_recursive_download (void *cls,
555 const char *filename,
556 const struct GNUNET_FS_Uri *uri,
557 const struct GNUNET_CONTAINER_MetaData *meta,
563 * We're done downloading a directory. Open the file and
564 * trigger all of the (remaining) child downloads.
566 * @param dc context of download that just completed
569 full_recursive_download (struct GNUNET_FS_DownloadContext *dc)
574 struct GNUNET_DISK_FileHandle *h;
575 struct GNUNET_DISK_MapHandle *m;
577 size64 = GNUNET_FS_uri_chk_get_file_size (dc->uri);
578 size = (size_t) size64;
579 if (size64 != (uint64_t) size)
581 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
582 _("Recursive downloads of directories larger than 4 GB are not supported on 32-bit systems\n"));
585 if (dc->filename != NULL)
587 h = GNUNET_DISK_file_open (dc->filename,
588 GNUNET_DISK_OPEN_READ,
589 GNUNET_DISK_PERM_NONE);
593 GNUNET_assert (dc->temp_filename != NULL);
594 h = GNUNET_DISK_file_open (dc->temp_filename,
595 GNUNET_DISK_OPEN_READ,
596 GNUNET_DISK_PERM_NONE);
600 data = GNUNET_DISK_file_map (h, &m, GNUNET_DISK_MAP_TYPE_READ, size);
603 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
604 _("Directory too large for system address space\n"));
608 GNUNET_FS_directory_list_contents (size,
611 &trigger_recursive_download,
613 GNUNET_DISK_file_unmap (m);
615 GNUNET_DISK_file_close (h);
616 if (dc->filename == NULL)
618 if (0 != UNLINK (dc->temp_filename))
619 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
622 GNUNET_free (dc->temp_filename);
623 dc->temp_filename = NULL;
629 * Check if all child-downloads have completed and
630 * if so, signal completion (and possibly recurse to
634 check_completed (struct GNUNET_FS_DownloadContext *dc)
636 struct GNUNET_FS_ProgressInfo pi;
637 struct GNUNET_FS_DownloadContext *pos;
639 pos = dc->child_head;
642 if ( (pos->emsg == NULL) &&
643 (pos->completed < pos->length) )
644 return; /* not done yet */
645 if ( (pos->child_head != NULL) &&
646 (pos->has_finished != GNUNET_YES) )
647 return; /* not transitively done yet */
650 dc->has_finished = GNUNET_YES;
651 GNUNET_FS_download_sync_ (dc);
652 /* signal completion */
653 pi.status = GNUNET_FS_STATUS_DOWNLOAD_COMPLETED;
654 GNUNET_FS_download_make_status_ (&pi, dc);
655 if (dc->parent != NULL)
656 check_completed (dc->parent);
661 * We found an entry in a directory. Check if the respective child
662 * already exists and if not create the respective child download.
664 * @param cls the parent download
665 * @param filename name of the file in the directory
666 * @param uri URI of the file (CHK or LOC)
667 * @param meta meta data of the file
668 * @param length number of bytes in data
669 * @param data contents of the file (or NULL if they were not inlined)
672 trigger_recursive_download (void *cls,
673 const char *filename,
674 const struct GNUNET_FS_Uri *uri,
675 const struct GNUNET_CONTAINER_MetaData *meta,
679 struct GNUNET_FS_DownloadContext *dc = cls;
680 struct GNUNET_FS_DownloadContext *cpos;
681 struct GNUNET_DISK_FileHandle *fh;
683 const char *real_name;
691 return; /* entry for the directory itself */
692 cpos = dc->child_head;
695 if ( (GNUNET_FS_uri_test_equal (uri,
697 ( (filename != NULL) &&
698 (0 == strcmp (cpos->filename,
704 return; /* already exists */
706 if (NULL == filename)
708 fn = GNUNET_FS_meta_data_suggest_filename (meta);
711 us = GNUNET_FS_uri_to_string (uri);
712 fn = GNUNET_strdup (&us [strlen (GNUNET_FS_URI_PREFIX
713 GNUNET_FS_URI_CHK_INFIX)]);
716 else if (fn[0] == '.')
719 us = GNUNET_FS_uri_to_string (uri);
720 GNUNET_asprintf (&fn,
722 &us[strlen (GNUNET_FS_URI_PREFIX
723 GNUNET_FS_URI_CHK_INFIX)], ext);
729 if (dc->filename == NULL)
735 dn = GNUNET_strdup (dc->filename);
736 GNUNET_break ( (strlen (dn) >= strlen (GNUNET_FS_DIRECTORY_EXT)) &&
738 strstr (dn + strlen(dn) - strlen(GNUNET_FS_DIRECTORY_EXT),
739 GNUNET_FS_DIRECTORY_EXT)) );
740 if ( (strlen (dn) >= strlen (GNUNET_FS_DIRECTORY_EXT)) &&
742 strstr (dn + strlen(dn) - strlen(GNUNET_FS_DIRECTORY_EXT),
743 GNUNET_FS_DIRECTORY_EXT)) )
744 dn[strlen(dn) - strlen (GNUNET_FS_DIRECTORY_EXT)] = '\0';
745 if ( (GNUNET_YES == GNUNET_FS_meta_data_test_for_directory (meta)) &&
746 ( (strlen (filename) < strlen (GNUNET_FS_DIRECTORY_EXT)) ||
748 strstr (filename + strlen(filename) - strlen(GNUNET_FS_DIRECTORY_EXT),
749 GNUNET_FS_DIRECTORY_EXT)) ) )
751 GNUNET_asprintf (&full_name,
756 GNUNET_FS_DIRECTORY_EXT);
760 GNUNET_asprintf (&full_name,
768 if ( (full_name != NULL) &&
770 GNUNET_DISK_directory_create_for_file (full_name)) )
772 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
773 _("Failed to create directory for recursive download of `%s'\n"),
775 GNUNET_free (full_name);
776 GNUNET_free_non_null (fn);
781 if ( (data != NULL) &&
782 (GNUNET_FS_uri_chk_get_file_size (uri) == length) )
784 if (full_name == NULL)
786 temp_name = GNUNET_DISK_mktemp ("gnunet-directory-download-tmp");
787 real_name = temp_name;
791 real_name = full_name;
793 /* write to disk, then trigger normal download which will instantly progress to completion */
794 fh = GNUNET_DISK_file_open (real_name,
795 GNUNET_DISK_OPEN_WRITE | GNUNET_DISK_OPEN_TRUNCATE | GNUNET_DISK_OPEN_CREATE,
796 GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE);
799 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
802 GNUNET_free (full_name);
803 GNUNET_free_non_null (fn);
807 GNUNET_DISK_file_write (fh,
811 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
815 GNUNET_DISK_file_close (fh);
817 GNUNET_FS_download_start (dc->h,
820 full_name, temp_name,
822 GNUNET_FS_uri_chk_get_file_size (uri),
827 GNUNET_free_non_null (full_name);
828 GNUNET_free_non_null (temp_name);
829 GNUNET_free_non_null (fn);
834 * Free entries in the map.
836 * @param cls unused (NULL)
838 * @param entry entry of type "struct DownloadRequest" which is freed
842 free_entry (void *cls,
843 const GNUNET_HashCode *key,
852 * Iterator over entries in the pending requests in the 'active' map for the
853 * reply that we just got.
855 * @param cls closure (our 'struct ProcessResultClosure')
856 * @param key query for the given value / request
857 * @param value value in the hash map (a 'struct DownloadRequest')
858 * @return GNUNET_YES (we should continue to iterate); unless serious error
861 process_result_with_request (void *cls,
862 const GNUNET_HashCode * key,
865 struct ProcessResultClosure *prc = cls;
866 struct DownloadRequest *sm = value;
867 struct DownloadRequest *ppos;
868 struct DownloadRequest *pprev;
869 struct GNUNET_DISK_FileHandle *fh;
870 struct GNUNET_FS_DownloadContext *dc = prc->dc;
871 struct GNUNET_CRYPTO_AesSessionKey skey;
872 struct GNUNET_CRYPTO_AesInitializationVector iv;
874 struct GNUNET_FS_ProgressInfo pi;
879 struct ContentHashKey *chk;
882 bs = GNUNET_FS_tree_calculate_block_size (GNUNET_ntohll (dc->uri->data.chk.file_length),
889 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
890 "Internal error or bogus download URI (expected %u bytes, got %u)\n",
894 dc->emsg = GNUNET_strdup ("Internal error or bogus download URI");
897 GNUNET_assert (GNUNET_YES ==
898 GNUNET_CONTAINER_multihashmap_remove (dc->active,
901 /* if this request is on the pending list, remove it! */
909 dc->pending = ppos->next;
911 pprev->next = ppos->next;
917 GNUNET_CRYPTO_hash_to_aes_key (&sm->chk.key, &skey, &iv);
918 GNUNET_CRYPTO_aes_decrypt (prc->data,
923 off = compute_disk_offset (GNUNET_ntohll (dc->uri->data.chk.file_length),
928 if ( ( GNUNET_YES == prc->do_store) &&
929 ( (dc->filename != NULL) ||
930 (is_recursive_download (dc)) ) &&
931 ( (sm->depth == dc->treedepth) ||
932 (0 == (dc->options & GNUNET_FS_DOWNLOAD_NO_TEMPORARIES)) ) )
934 fh = GNUNET_DISK_file_open (dc->filename != NULL
937 GNUNET_DISK_OPEN_READWRITE |
938 GNUNET_DISK_OPEN_CREATE,
939 GNUNET_DISK_PERM_USER_READ |
940 GNUNET_DISK_PERM_USER_WRITE |
941 GNUNET_DISK_PERM_GROUP_READ |
942 GNUNET_DISK_PERM_OTHER_READ);
945 (GNUNET_YES == prc->do_store) &&
946 ( (dc->filename != NULL) ||
947 (is_recursive_download (dc)) ) &&
948 ( (sm->depth == dc->treedepth) ||
949 (0 == (dc->options & GNUNET_FS_DOWNLOAD_NO_TEMPORARIES)) ) )
951 GNUNET_asprintf (&dc->emsg,
952 _("Download failed: could not open file `%s': %s\n"),
960 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
961 "Saving decrypted block to disk at offset %llu\n",
962 (unsigned long long) off);
965 GNUNET_DISK_file_seek (fh,
967 GNUNET_DISK_SEEK_SET) ) )
969 GNUNET_asprintf (&dc->emsg,
970 _("Failed to seek to offset %llu in file `%s': %s\n"),
971 (unsigned long long) off,
977 GNUNET_DISK_file_write (fh,
981 GNUNET_asprintf (&dc->emsg,
982 _("Failed to write block of %u bytes at offset %llu in file `%s': %s\n"),
983 (unsigned int) prc->size,
984 (unsigned long long) off,
989 GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
992 if (sm->depth == dc->treedepth)
995 if (sm->offset < dc->offset)
997 /* starting offset begins in the middle of pt,
998 do not count first bytes as progress */
999 GNUNET_assert (app > (dc->offset - sm->offset));
1000 app -= (dc->offset - sm->offset);
1002 if (sm->offset + prc->size > dc->offset + dc->length)
1004 /* end of block is after relevant range,
1005 do not count last bytes as progress */
1006 GNUNET_assert (app > (sm->offset + prc->size) - (dc->offset + dc->length));
1007 app -= (sm->offset + prc->size) - (dc->offset + dc->length);
1009 dc->completed += app;
1011 /* do recursive download if option is set and either meta data
1012 says it is a directory or if no meta data is given AND filename
1013 ends in '.gnd' (top-level case) */
1014 if (is_recursive_download (dc))
1015 GNUNET_FS_directory_list_contents (prc->size,
1018 &trigger_recursive_download,
1022 pi.status = GNUNET_FS_STATUS_DOWNLOAD_PROGRESS;
1023 pi.value.download.specifics.progress.data = pt;
1024 pi.value.download.specifics.progress.offset = sm->offset;
1025 pi.value.download.specifics.progress.data_len = prc->size;
1026 pi.value.download.specifics.progress.depth = sm->depth;
1027 GNUNET_FS_download_make_status_ (&pi, dc);
1028 GNUNET_assert (dc->completed <= dc->length);
1029 if (dc->completed == dc->length)
1032 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1033 "Download completed, truncating file to desired length %llu\n",
1034 (unsigned long long) GNUNET_ntohll (dc->uri->data.chk.file_length));
1036 /* truncate file to size (since we store IBlocks at the end) */
1037 if (dc->filename != NULL)
1039 if (0 != truncate (dc->filename,
1040 GNUNET_ntohll (dc->uri->data.chk.file_length)))
1041 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
1045 if (dc->job_queue != NULL)
1047 GNUNET_FS_dequeue_ (dc->job_queue);
1048 dc->job_queue = NULL;
1050 if (is_recursive_download (dc))
1051 full_recursive_download (dc);
1052 if (dc->child_head == NULL)
1054 /* signal completion */
1055 pi.status = GNUNET_FS_STATUS_DOWNLOAD_COMPLETED;
1056 GNUNET_FS_download_make_status_ (&pi, dc);
1057 if (dc->parent != NULL)
1058 check_completed (dc->parent);
1060 GNUNET_assert (sm->depth == dc->treedepth);
1062 if (sm->depth == dc->treedepth)
1064 GNUNET_FS_download_sync_ (dc);
1069 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1070 "Triggering downloads of children (this block was at depth %u and offset %llu)\n",
1072 (unsigned long long) sm->offset);
1074 GNUNET_assert (0 == (prc->size % sizeof(struct ContentHashKey)));
1075 chk = (struct ContentHashKey*) pt;
1076 for (i=(prc->size / sizeof(struct ContentHashKey))-1;i>=0;i--)
1078 off = compute_dblock_offset (sm->offset,
1082 if ( (off + DBLOCK_SIZE >= dc->offset) &&
1083 (off < dc->offset + dc->length) )
1084 schedule_block_download (dc,
1090 GNUNET_FS_download_sync_ (dc);
1095 GNUNET_DISK_file_close (fh);
1096 pi.status = GNUNET_FS_STATUS_DOWNLOAD_ERROR;
1097 pi.value.download.specifics.error.message = dc->emsg;
1098 GNUNET_FS_download_make_status_ (&pi, dc);
1099 /* abort all pending requests */
1102 GNUNET_CLIENT_notify_transmit_ready_cancel (dc->th);
1105 GNUNET_CLIENT_disconnect (dc->client, GNUNET_NO);
1106 GNUNET_CONTAINER_multihashmap_iterate (dc->active,
1112 GNUNET_FS_download_sync_ (dc);
1118 * Process a download result.
1120 * @param dc our download context
1121 * @param type type of the result
1122 * @param data the (encrypted) response
1123 * @param size size of data
1126 process_result (struct GNUNET_FS_DownloadContext *dc,
1127 enum GNUNET_BLOCK_Type type,
1131 struct ProcessResultClosure prc;
1137 prc.do_store = GNUNET_YES;
1138 GNUNET_CRYPTO_hash (data, size, &prc.query);
1140 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1141 "Received result for query `%s' from `%s'-service\n",
1142 GNUNET_h2s (&prc.query),
1145 GNUNET_CONTAINER_multihashmap_get_multiple (dc->active,
1147 &process_result_with_request,
1153 * Type of a function to call when we receive a message
1156 * @param cls closure
1157 * @param msg message received, NULL on timeout or fatal error
1160 receive_results (void *cls,
1161 const struct GNUNET_MessageHeader * msg)
1163 struct GNUNET_FS_DownloadContext *dc = cls;
1164 const struct PutMessage *cm;
1167 if ( (NULL == msg) ||
1168 (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_FS_PUT) ||
1169 (sizeof (struct PutMessage) > ntohs(msg->size)) )
1171 GNUNET_break (msg == NULL);
1175 msize = ntohs(msg->size);
1176 cm = (const struct PutMessage*) msg;
1180 msize - sizeof (struct PutMessage));
1181 if (dc->client == NULL)
1182 return; /* fatal error */
1183 /* continue receiving */
1184 GNUNET_CLIENT_receive (dc->client,
1187 GNUNET_TIME_UNIT_FOREVER_REL);
1193 * We're ready to transmit a search request to the
1194 * file-sharing service. Do it. If there is
1195 * more than one request pending, try to send
1196 * multiple or request another transmission.
1198 * @param cls closure
1199 * @param size number of bytes available in buf
1200 * @param buf where the callee should write the message
1201 * @return number of bytes written to buf
1204 transmit_download_request (void *cls,
1208 struct GNUNET_FS_DownloadContext *dc = cls;
1210 struct SearchMessage *sm;
1216 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1217 "Transmitting download request failed, trying to reconnect\n");
1222 GNUNET_assert (size >= sizeof (struct SearchMessage));
1225 while ( (dc->pending != NULL) &&
1226 (size > msize + sizeof (struct SearchMessage)) )
1229 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1230 "Transmitting download request for `%s' to `%s'-service\n",
1231 GNUNET_h2s (&dc->pending->chk.query),
1234 memset (sm, 0, sizeof (struct SearchMessage));
1235 sm->header.size = htons (sizeof (struct SearchMessage));
1236 sm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_START_SEARCH);
1237 if (0 != (dc->options & GNUNET_FS_DOWNLOAD_OPTION_LOOPBACK_ONLY))
1238 sm->options = htonl (1);
1240 sm->options = htonl (0);
1241 if (dc->pending->depth == dc->treedepth)
1242 sm->type = htonl (GNUNET_BLOCK_TYPE_DBLOCK);
1244 sm->type = htonl (GNUNET_BLOCK_TYPE_IBLOCK);
1245 sm->anonymity_level = htonl (dc->anonymity);
1246 sm->target = dc->target.hashPubKey;
1247 sm->query = dc->pending->chk.query;
1248 dc->pending->is_pending = GNUNET_NO;
1249 dc->pending = dc->pending->next;
1250 msize += sizeof (struct SearchMessage);
1253 if (dc->pending != NULL)
1254 dc->th = GNUNET_CLIENT_notify_transmit_ready (dc->client,
1255 sizeof (struct SearchMessage),
1256 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1258 &transmit_download_request,
1265 * Reconnect to the FS service and transmit our queries NOW.
1267 * @param cls our download context
1271 do_reconnect (void *cls,
1272 const struct GNUNET_SCHEDULER_TaskContext *tc)
1274 struct GNUNET_FS_DownloadContext *dc = cls;
1275 struct GNUNET_CLIENT_Connection *client;
1277 dc->task = GNUNET_SCHEDULER_NO_TASK;
1278 client = GNUNET_CLIENT_connect (dc->h->sched,
1283 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1284 "Connecting to `%s'-service failed, will try again.\n",
1289 dc->client = client;
1290 dc->th = GNUNET_CLIENT_notify_transmit_ready (client,
1291 sizeof (struct SearchMessage),
1292 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1294 &transmit_download_request,
1296 GNUNET_CLIENT_receive (client,
1299 GNUNET_TIME_UNIT_FOREVER_REL);
1304 * Add entries that are not yet pending back to the pending list.
1306 * @param cls our download context
1308 * @param entry entry of type "struct DownloadRequest"
1312 retry_entry (void *cls,
1313 const GNUNET_HashCode *key,
1316 struct GNUNET_FS_DownloadContext *dc = cls;
1317 struct DownloadRequest *dr = entry;
1319 if (! dr->is_pending)
1321 dr->next = dc->pending;
1322 dr->is_pending = GNUNET_YES;
1323 dc->pending = entry;
1330 * We've lost our connection with the FS service.
1331 * Re-establish it and re-transmit all of our
1334 * @param dc download context that is having trouble
1337 try_reconnect (struct GNUNET_FS_DownloadContext *dc)
1340 if (NULL != dc->client)
1343 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1344 "Moving all requests back to pending list\n");
1348 GNUNET_CLIENT_notify_transmit_ready_cancel (dc->th);
1351 GNUNET_CONTAINER_multihashmap_iterate (dc->active,
1354 GNUNET_CLIENT_disconnect (dc->client, GNUNET_NO);
1358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1359 "Will try to reconnect in 1s\n");
1362 = GNUNET_SCHEDULER_add_delayed (dc->h->sched,
1363 GNUNET_TIME_UNIT_SECONDS,
1371 * We're allowed to ask the FS service for our blocks. Start the download.
1373 * @param cls the 'struct GNUNET_FS_DownloadContext'
1374 * @param client handle to use for communcation with FS (we must destroy it!)
1377 activate_fs_download (void *cls,
1378 struct GNUNET_CLIENT_Connection *client)
1380 struct GNUNET_FS_DownloadContext *dc = cls;
1381 struct GNUNET_FS_ProgressInfo pi;
1383 GNUNET_assert (NULL != client);
1384 GNUNET_assert (dc->client == NULL);
1385 GNUNET_assert (dc->th == NULL);
1386 dc->client = client;
1387 GNUNET_CLIENT_receive (client,
1390 GNUNET_TIME_UNIT_FOREVER_REL);
1391 pi.status = GNUNET_FS_STATUS_DOWNLOAD_ACTIVE;
1392 GNUNET_FS_download_make_status_ (&pi, dc);
1393 GNUNET_CONTAINER_multihashmap_iterate (dc->active,
1396 dc->th = GNUNET_CLIENT_notify_transmit_ready (dc->client,
1397 sizeof (struct SearchMessage),
1398 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1400 &transmit_download_request,
1406 * We must stop to ask the FS service for our blocks. Pause the download.
1408 * @param cls the 'struct GNUNET_FS_DownloadContext'
1411 deactivate_fs_download (void *cls)
1413 struct GNUNET_FS_DownloadContext *dc = cls;
1414 struct GNUNET_FS_ProgressInfo pi;
1418 GNUNET_CLIENT_notify_transmit_ready_cancel (dc->th);
1421 if (NULL != dc->client)
1423 GNUNET_CLIENT_disconnect (dc->client, GNUNET_NO);
1426 pi.status = GNUNET_FS_STATUS_DOWNLOAD_INACTIVE;
1427 GNUNET_FS_download_make_status_ (&pi, dc);
1432 * Create SUSPEND event for the given download operation
1433 * and then clean up our state (without stop signal).
1435 * @param cls the 'struct GNUNET_FS_DownloadContext' to signal for
1438 GNUNET_FS_download_signal_suspend_ (void *cls)
1440 struct GNUNET_FS_DownloadContext *dc = cls;
1441 struct GNUNET_FS_ProgressInfo pi;
1443 if (dc->top != NULL)
1444 GNUNET_FS_end_top (dc->h, dc->top);
1445 while (NULL != dc->child_head)
1446 GNUNET_FS_download_signal_suspend_ (dc->child_head);
1447 if (dc->search != NULL)
1449 dc->search->download = NULL;
1452 if (dc->job_queue != NULL)
1454 GNUNET_FS_dequeue_ (dc->job_queue);
1455 dc->job_queue = NULL;
1457 if (dc->parent != NULL)
1458 GNUNET_CONTAINER_DLL_remove (dc->parent->child_head,
1459 dc->parent->child_tail,
1461 pi.status = GNUNET_FS_STATUS_DOWNLOAD_SUSPEND;
1462 GNUNET_FS_download_make_status_ (&pi, dc);
1463 if (GNUNET_SCHEDULER_NO_TASK != dc->task)
1464 GNUNET_SCHEDULER_cancel (dc->h->sched,
1466 GNUNET_CONTAINER_multihashmap_iterate (dc->active,
1469 GNUNET_CONTAINER_multihashmap_destroy (dc->active);
1470 GNUNET_free_non_null (dc->filename);
1471 GNUNET_CONTAINER_meta_data_destroy (dc->meta);
1472 GNUNET_FS_uri_destroy (dc->uri);
1473 GNUNET_free_non_null (dc->temp_filename);
1474 GNUNET_free_non_null (dc->serialization);
1480 * Download parts of a file. Note that this will store
1481 * the blocks at the respective offset in the given file. Also, the
1482 * download is still using the blocking of the underlying FS
1483 * encoding. As a result, the download may *write* outside of the
1484 * given boundaries (if offset and length do not match the 32k FS
1485 * block boundaries). <p>
1487 * This function should be used to focus a download towards a
1488 * particular portion of the file (optimization), not to strictly
1489 * limit the download to exactly those bytes.
1491 * @param h handle to the file sharing subsystem
1492 * @param uri the URI of the file (determines what to download); CHK or LOC URI
1493 * @param meta known metadata for the file (can be NULL)
1494 * @param filename where to store the file, maybe NULL (then no file is
1495 * created on disk and data must be grabbed from the callbacks)
1496 * @param tempname where to store temporary file data, not used if filename is non-NULL;
1497 * can be NULL (in which case we will pick a name if needed); the temporary file
1498 * may already exist, in which case we will try to use the data that is there and
1499 * if it is not what is desired, will overwrite it
1500 * @param offset at what offset should we start the download (typically 0)
1501 * @param length how many bytes should be downloaded starting at offset
1502 * @param anonymity anonymity level to use for the download
1503 * @param options various options
1504 * @param cctx initial value for the client context for this download
1505 * @param parent parent download to associate this download with (use NULL
1506 * for top-level downloads; useful for manually-triggered recursive downloads)
1507 * @return context that can be used to control this download
1509 struct GNUNET_FS_DownloadContext *
1510 GNUNET_FS_download_start (struct GNUNET_FS_Handle *h,
1511 const struct GNUNET_FS_Uri *uri,
1512 const struct GNUNET_CONTAINER_MetaData *meta,
1513 const char *filename,
1514 const char *tempname,
1518 enum GNUNET_FS_DownloadOptions options,
1520 struct GNUNET_FS_DownloadContext *parent)
1522 struct GNUNET_FS_ProgressInfo pi;
1523 struct GNUNET_FS_DownloadContext *dc;
1525 GNUNET_assert (GNUNET_FS_uri_test_chk (uri));
1526 if ( (offset + length < offset) ||
1527 (offset + length > uri->data.chk.file_length) )
1533 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1534 "Starting download `%s' of %llu bytes\n",
1536 (unsigned long long) length);
1538 dc = GNUNET_malloc (sizeof(struct GNUNET_FS_DownloadContext));
1540 dc->parent = parent;
1543 GNUNET_CONTAINER_DLL_insert (parent->child_head,
1547 dc->uri = GNUNET_FS_uri_dup (uri);
1548 dc->meta = GNUNET_CONTAINER_meta_data_duplicate (meta);
1549 dc->client_info = cctx;
1550 dc->start_time = GNUNET_TIME_absolute_get ();
1551 if (NULL != filename)
1553 dc->filename = GNUNET_strdup (filename);
1554 if (GNUNET_YES == GNUNET_DISK_file_test (filename))
1555 GNUNET_DISK_file_size (filename,
1559 if (GNUNET_FS_uri_test_loc (dc->uri))
1560 GNUNET_assert (GNUNET_OK ==
1561 GNUNET_FS_uri_loc_get_peer_identity (dc->uri,
1563 dc->offset = offset;
1564 dc->length = length;
1565 dc->anonymity = anonymity;
1566 dc->options = options;
1567 dc->active = GNUNET_CONTAINER_multihashmap_create (1 + 2 * (length / DBLOCK_SIZE));
1568 dc->treedepth = GNUNET_FS_compute_depth (GNUNET_ntohll(dc->uri->data.chk.file_length));
1569 if ( (filename == NULL) &&
1570 (is_recursive_download (dc) ) )
1572 if (tempname != NULL)
1573 dc->temp_filename = GNUNET_strdup (tempname);
1575 dc->temp_filename = GNUNET_DISK_mktemp ("gnunet-directory-download-tmp");
1579 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1580 "Download tree has depth %u\n",
1585 dc->top = GNUNET_FS_make_top (dc->h,
1586 &GNUNET_FS_download_signal_suspend_,
1589 pi.status = GNUNET_FS_STATUS_DOWNLOAD_START;
1590 pi.value.download.specifics.start.meta = meta;
1591 GNUNET_FS_download_make_status_ (&pi, dc);
1592 schedule_block_download (dc,
1593 &dc->uri->data.chk.chk,
1595 1 /* 0 == CHK, 1 == top */);
1596 GNUNET_FS_download_sync_ (dc);
1597 GNUNET_FS_download_start_downloading_ (dc);
1603 * Download parts of a file based on a search result. The download
1604 * will be associated with the search result (and the association
1605 * will be preserved when serializing/deserializing the state).
1606 * If the search is stopped, the download will not be aborted but
1607 * be 'promoted' to a stand-alone download.
1609 * As with the other download function, this will store
1610 * the blocks at the respective offset in the given file. Also, the
1611 * download is still using the blocking of the underlying FS
1612 * encoding. As a result, the download may *write* outside of the
1613 * given boundaries (if offset and length do not match the 32k FS
1614 * block boundaries). <p>
1616 * The given range can be used to focus a download towards a
1617 * particular portion of the file (optimization), not to strictly
1618 * limit the download to exactly those bytes.
1620 * @param h handle to the file sharing subsystem
1621 * @param sr the search result to use for the download (determines uri and
1622 * meta data and associations)
1623 * @param filename where to store the file, maybe NULL (then no file is
1624 * created on disk and data must be grabbed from the callbacks)
1625 * @param tempname where to store temporary file data, not used if filename is non-NULL;
1626 * can be NULL (in which case we will pick a name if needed); the temporary file
1627 * may already exist, in which case we will try to use the data that is there and
1628 * if it is not what is desired, will overwrite it
1629 * @param offset at what offset should we start the download (typically 0)
1630 * @param length how many bytes should be downloaded starting at offset
1631 * @param anonymity anonymity level to use for the download
1632 * @param options various download options
1633 * @param cctx initial value for the client context for this download
1634 * @return context that can be used to control this download
1636 struct GNUNET_FS_DownloadContext *
1637 GNUNET_FS_download_start_from_search (struct GNUNET_FS_Handle *h,
1638 struct GNUNET_FS_SearchResult *sr,
1639 const char *filename,
1640 const char *tempname,
1644 enum GNUNET_FS_DownloadOptions options,
1647 struct GNUNET_FS_ProgressInfo pi;
1648 struct GNUNET_FS_DownloadContext *dc;
1650 if ( (sr != NULL) &&
1651 (sr->download != NULL) )
1656 GNUNET_assert (GNUNET_FS_uri_test_chk (sr->uri));
1657 if ( (offset + length < offset) ||
1658 (offset + length > sr->uri->data.chk.file_length) )
1664 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1665 "Starting download `%s' of %llu bytes\n",
1667 (unsigned long long) length);
1669 dc = GNUNET_malloc (sizeof(struct GNUNET_FS_DownloadContext));
1673 if (sr->probe_ctx != NULL)
1675 GNUNET_FS_download_stop (sr->probe_ctx, GNUNET_YES);
1676 sr->probe_ctx = NULL;
1678 dc->uri = GNUNET_FS_uri_dup (sr->uri);
1679 dc->meta = GNUNET_CONTAINER_meta_data_duplicate (sr->meta);
1680 dc->client_info = cctx;
1681 dc->start_time = GNUNET_TIME_absolute_get ();
1682 if (NULL != filename)
1684 dc->filename = GNUNET_strdup (filename);
1685 if (GNUNET_YES == GNUNET_DISK_file_test (filename))
1686 GNUNET_DISK_file_size (filename,
1690 if (GNUNET_FS_uri_test_loc (dc->uri))
1691 GNUNET_assert (GNUNET_OK ==
1692 GNUNET_FS_uri_loc_get_peer_identity (dc->uri,
1694 dc->offset = offset;
1695 dc->length = length;
1696 dc->anonymity = anonymity;
1697 dc->options = options;
1698 dc->active = GNUNET_CONTAINER_multihashmap_create (1 + 2 * (length / DBLOCK_SIZE));
1699 dc->treedepth = GNUNET_FS_compute_depth (GNUNET_ntohll(dc->uri->data.chk.file_length));
1700 if ( (filename == NULL) &&
1701 (is_recursive_download (dc) ) )
1703 if (tempname != NULL)
1704 dc->temp_filename = GNUNET_strdup (tempname);
1706 dc->temp_filename = GNUNET_DISK_mktemp ("gnunet-directory-download-tmp");
1710 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1711 "Download tree has depth %u\n",
1714 pi.status = GNUNET_FS_STATUS_DOWNLOAD_START;
1715 pi.value.download.specifics.start.meta = dc->meta;
1716 GNUNET_FS_download_make_status_ (&pi, dc);
1717 schedule_block_download (dc,
1718 &dc->uri->data.chk.chk,
1720 1 /* 0 == CHK, 1 == top */);
1721 GNUNET_FS_download_sync_ (dc);
1722 GNUNET_FS_download_start_downloading_ (dc);
1728 * Start the downloading process (by entering the queue).
1730 * @param dc our download context
1733 GNUNET_FS_download_start_downloading_ (struct GNUNET_FS_DownloadContext *dc)
1735 GNUNET_assert (dc->job_queue == NULL);
1736 dc->job_queue = GNUNET_FS_queue_ (dc->h,
1737 &activate_fs_download,
1738 &deactivate_fs_download,
1740 (dc->length + DBLOCK_SIZE-1) / DBLOCK_SIZE);
1745 * Stop a download (aborts if download is incomplete).
1747 * @param dc handle for the download
1748 * @param do_delete delete files of incomplete downloads
1751 GNUNET_FS_download_stop (struct GNUNET_FS_DownloadContext *dc,
1754 struct GNUNET_FS_ProgressInfo pi;
1757 if (dc->top != NULL)
1758 GNUNET_FS_end_top (dc->h, dc->top);
1759 if (dc->search != NULL)
1761 dc->search->download = NULL;
1764 if (dc->job_queue != NULL)
1766 GNUNET_FS_dequeue_ (dc->job_queue);
1767 dc->job_queue = NULL;
1769 have_children = (NULL != dc->child_head) ? GNUNET_YES : GNUNET_NO;
1770 while (NULL != dc->child_head)
1771 GNUNET_FS_download_stop (dc->child_head,
1773 if (dc->parent != NULL)
1774 GNUNET_CONTAINER_DLL_remove (dc->parent->child_head,
1775 dc->parent->child_tail,
1777 if (dc->serialization != NULL)
1778 GNUNET_FS_remove_sync_file_ (dc->h,
1779 ( (dc->parent != NULL) || (dc->search != NULL) )
1780 ? GNUNET_FS_SYNC_PATH_CHILD_DOWNLOAD
1781 : GNUNET_FS_SYNC_PATH_MASTER_DOWNLOAD ,
1783 if ( (GNUNET_YES == have_children) &&
1784 (dc->parent == NULL) )
1785 GNUNET_FS_remove_sync_dir_ (dc->h,
1786 (dc->search != NULL)
1787 ? GNUNET_FS_SYNC_PATH_CHILD_DOWNLOAD
1788 : GNUNET_FS_SYNC_PATH_MASTER_DOWNLOAD,
1790 pi.status = GNUNET_FS_STATUS_DOWNLOAD_STOPPED;
1791 GNUNET_FS_download_make_status_ (&pi, dc);
1792 if (GNUNET_SCHEDULER_NO_TASK != dc->task)
1793 GNUNET_SCHEDULER_cancel (dc->h->sched,
1795 GNUNET_CONTAINER_multihashmap_iterate (dc->active,
1798 GNUNET_CONTAINER_multihashmap_destroy (dc->active);
1799 if (dc->filename != NULL)
1801 if ( (dc->completed != dc->length) &&
1802 (GNUNET_YES == do_delete) )
1804 if (0 != UNLINK (dc->filename))
1805 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
1809 GNUNET_free (dc->filename);
1811 GNUNET_CONTAINER_meta_data_destroy (dc->meta);
1812 GNUNET_FS_uri_destroy (dc->uri);
1813 if (NULL != dc->temp_filename)
1815 if (0 != UNLINK (dc->temp_filename))
1816 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
1819 GNUNET_free (dc->temp_filename);
1821 GNUNET_free_non_null (dc->serialization);
1825 /* end of fs_download.c */