GNUnet 0.21.1
fs_download.c File Reference

download methods More...

#include "platform.h"
#include "gnunet_constants.h"
#include "gnunet_fs_service.h"
#include "fs_api.h"
#include "fs_tree.h"
Include dependency graph for fs_download.c:

Go to the source code of this file.

Data Structures

struct  ProcessResultClosure
 Closure for iterator processing results. More...
 

Macros

#define GNUNET_FS_URI_CHK_PREFIX   GNUNET_FS_URI_PREFIX GNUNET_FS_URI_CHK_INFIX
 

Functions

static int is_recursive_download (struct GNUNET_FS_DownloadContext *dc)
 Determine if the given download (options and meta data) should cause use to try to do a recursive download. More...
 
static uint64_t compute_disk_offset (uint64_t fsize, uint64_t off, unsigned int depth)
 We're storing the IBLOCKS after the DBLOCKS on disk (so that we only have to truncate the file once we're done). More...
 
void GNUNET_FS_download_make_status_ (struct GNUNET_FS_ProgressInfo *pi, struct GNUNET_FS_DownloadContext *dc)
 Fill in all of the generic fields for a download event and call the callback. More...
 
static int process_result_with_request (void *cls, const struct GNUNET_HashCode *key, void *value)
 Iterator over entries in the pending requests in the 'active' map for the reply that we just got. More...
 
static int encrypt_existing_match (struct GNUNET_FS_DownloadContext *dc, const struct ContentHashKey *chk, struct DownloadRequest *dr, const char *block, size_t len, int do_store)
 We've found a matching block without downloading it. More...
 
static void try_reconnect (struct GNUNET_FS_DownloadContext *dc)
 We've lost our connection with the FS service. More...
 
static void trigger_recursive_download (void *cls, const char *filename, const struct GNUNET_FS_Uri *uri, const struct GNUNET_FS_MetaData *meta, size_t length, const void *data)
 We found an entry in a directory. More...
 
static void full_recursive_download (struct GNUNET_FS_DownloadContext *dc)
 We're done downloading a directory. More...
 
static void check_completed (struct GNUNET_FS_DownloadContext *dc)
 Check if all child-downloads have completed (or trigger them if necessary) and once we're completely done, signal completion (and possibly recurse to parent). More...
 
static void try_match_block (struct GNUNET_FS_DownloadContext *dc, struct DownloadRequest *dr, const char *data, size_t data_len)
 We got a block of plaintext data (from the meta data). More...
 
static int match_full_data (void *cls, const char *plugin_name, enum EXTRACTOR_MetaType type, enum EXTRACTOR_MetaFormat format, const char *data_mime_type, const char *data, size_t data_len)
 Type of a function that libextractor calls for each meta data item found. More...
 
static void propagate_up (struct DownloadRequest *dr)
 Set the state of the given download request to BRS_DOWNLOAD_UP and propagate it up the tree. More...
 
static void try_top_down_reconstruction (struct GNUNET_FS_DownloadContext *dc, struct DownloadRequest *dr)
 Try top-down reconstruction. More...
 
static int retry_entry (void *cls, const struct GNUNET_HashCode *key, void *entry)
 Add entries to the message queue. More...
 
static void schedule_block_download (struct GNUNET_FS_DownloadContext *dc, struct DownloadRequest *dr)
 Schedule the download of the specified block in the tree. More...
 
void GNUNET_FS_free_download_request_ (struct DownloadRequest *dr)
 (recursively) free download request structure More...
 
static int check_put (void *cls, const struct ClientPutMessage *cm)
 Type of a function to call when we check the PUT message from the service. More...
 
static void handle_put (void *cls, const struct ClientPutMessage *cm)
 Type of a function to call when we receive a message from the service. More...
 
static void download_mq_error_handler (void *cls, enum GNUNET_MQ_Error error)
 Generic error handler, called with the appropriate error code and the same closure specified at the creation of the message queue. More...
 
static void do_reconnect (void *cls)
 Reconnect to the FS service and transmit our queries NOW. More...
 
static void activate_fs_download (void *cls)
 We're allowed to ask the FS service for our blocks. More...
 
static void deactivate_fs_download (void *cls)
 We must stop to ask the FS service for our blocks. More...
 
static struct DownloadRequestcreate_download_request (struct DownloadRequest *parent, unsigned int chk_idx, unsigned int depth, uint64_t dr_offset, uint64_t file_start_offset, uint64_t desired_length)
 (recursively) Create a download request structure. More...
 
static void reconstruct_cont (void *cls)
 Continuation after a possible attempt to reconstruct the current IBlock from the existing file. More...
 
static void get_next_block (void *cls)
 Task requesting the next block from the tree encoder. More...
 
static void reconstruct_cb (void *cls, const struct ContentHashKey *chk, uint64_t offset, unsigned int depth, enum GNUNET_BLOCK_Type type, const void *block, uint16_t block_size)
 Function called asking for the current (encoded) block to be processed. More...
 
static size_t fh_reader (void *cls, uint64_t offset, size_t max, void *buf, char **emsg)
 Function called by the tree encoder to obtain a block of plaintext data (for the lowest level of the tree). More...
 
void GNUNET_FS_download_start_task_ (void *cls)
 Task that creates the initial (top-level) download request for the file. More...
 
void GNUNET_FS_download_signal_suspend_ (void *cls)
 Create SUSPEND event for the given download operation and then clean up our state (without stop signal). More...
 
struct GNUNET_FS_DownloadContextcreate_download_context (struct GNUNET_FS_Handle *h, const struct GNUNET_FS_Uri *uri, const struct GNUNET_FS_MetaData *meta, const char *filename, const char *tempname, uint64_t offset, uint64_t length, uint32_t anonymity, enum GNUNET_FS_DownloadOptions options, void *cctx)
 Helper function to setup the download context. More...
 
struct GNUNET_FS_DownloadContextGNUNET_FS_download_start (struct GNUNET_FS_Handle *h, const struct GNUNET_FS_Uri *uri, const struct GNUNET_FS_MetaData *meta, const char *filename, const char *tempname, uint64_t offset, uint64_t length, uint32_t anonymity, enum GNUNET_FS_DownloadOptions options, void *cctx, struct GNUNET_FS_DownloadContext *parent)
 Download parts of a file. More...
 
struct GNUNET_FS_DownloadContextGNUNET_FS_download_start_from_search (struct GNUNET_FS_Handle *h, struct GNUNET_FS_SearchResult *sr, const char *filename, const char *tempname, uint64_t offset, uint64_t length, uint32_t anonymity, enum GNUNET_FS_DownloadOptions options, void *cctx)
 Download parts of a file based on a search result. More...
 
void GNUNET_FS_download_start_downloading_ (struct GNUNET_FS_DownloadContext *dc)
 Start the downloading process (by entering the queue). More...
 
void GNUNET_FS_download_suspend (struct GNUNET_FS_DownloadContext *dc)
 Suspend a download. More...
 
void GNUNET_FS_download_resume (struct GNUNET_FS_DownloadContext *dc)
 Resume a suspended download. More...
 
void GNUNET_FS_download_stop (struct GNUNET_FS_DownloadContext *dc, int do_delete)
 Stop a download (aborts if download is incomplete). More...
 

Detailed Description

download methods

Author
Christian Grothoff

Definition in file fs_download.c.

Macro Definition Documentation

◆ GNUNET_FS_URI_CHK_PREFIX

#define GNUNET_FS_URI_CHK_PREFIX   GNUNET_FS_URI_PREFIX GNUNET_FS_URI_CHK_INFIX

Definition at line 837 of file fs_download.c.

Function Documentation

◆ is_recursive_download()

static int is_recursive_download ( struct GNUNET_FS_DownloadContext dc)
static

Determine if the given download (options and meta data) should cause use to try to do a recursive download.

Definition at line 38 of file fs_download.c.

39{
42 ((NULL == dc->meta) &&
43 ((NULL == dc->filename) ||
44 ((strlen (dc->filename) >= strlen (GNUNET_FS_DIRECTORY_EXT)) &&
45 (NULL != strstr (dc->filename + strlen (dc->filename)
46 - strlen (GNUNET_FS_DIRECTORY_EXT),
48}
static struct GNUNET_FS_DownloadContext * dc
int GNUNET_FS_meta_data_test_for_directory(const struct GNUNET_FS_MetaData *md)
Does the meta-data claim that this is a directory? Checks if the mime-type is that of a GNUnet direct...
Definition: fs_directory.c:55
#define GNUNET_FS_DIRECTORY_EXT
@ GNUNET_FS_DOWNLOAD_OPTION_RECURSIVE
Do a recursive download (that is, automatically trigger the download of files in directories).
@ GNUNET_YES
char * filename
Where are we writing the data (name of the file, can be NULL!).
Definition: fs_api.h:1822
struct GNUNET_FS_MetaData * meta
Known meta-data for the file (can be NULL).
Definition: fs_api.h:1805
enum GNUNET_FS_DownloadOptions options
Options for the download.
Definition: fs_api.h:1923

References dc, GNUNET_FS_DownloadContext::filename, GNUNET_FS_DIRECTORY_EXT, GNUNET_FS_DOWNLOAD_OPTION_RECURSIVE, GNUNET_FS_meta_data_test_for_directory(), GNUNET_YES, GNUNET_FS_DownloadContext::meta, and GNUNET_FS_DownloadContext::options.

Referenced by check_completed(), create_download_context(), and process_result_with_request().

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◆ compute_disk_offset()

static uint64_t compute_disk_offset ( uint64_t  fsize,
uint64_t  off,
unsigned int  depth 
)
static

We're storing the IBLOCKS after the DBLOCKS on disk (so that we only have to truncate the file once we're done).

Given the offset of a block (with respect to the DBLOCKS) and its depth, return the offset where we would store this block in the file.

Parameters
fsizeoverall file size
offoffset of the block in the file
depthdepth of the block in the tree, 0 for DBLOCK
Returns
off for DBLOCKS (depth == treedepth), otherwise an offset past the end of the file that does not overlap with the range for any other block

Definition at line 68 of file fs_download.c.

69{
70 unsigned int i;
71 uint64_t lsize; /* what is the size of all IBlocks for depth "i"? */
72 uint64_t loff; /* where do IBlocks for depth "i" start? */
73 unsigned int ioff; /* which IBlock corresponds to "off" at depth "i"? */
74
75 if (0 == depth)
76 return off;
77 /* first IBlocks start at the end of file, rounded up
78 * to full DBLOCK_SIZE */
79 loff = ((fsize + DBLOCK_SIZE - 1) / DBLOCK_SIZE) * DBLOCK_SIZE;
80 lsize =
81 ((fsize + DBLOCK_SIZE - 1) / DBLOCK_SIZE) * sizeof(struct ContentHashKey);
82 GNUNET_assert (0 == (off % DBLOCK_SIZE));
83 ioff = (off / DBLOCK_SIZE);
84 for (i = 1; i < depth; i++)
85 {
86 loff += lsize;
87 lsize = (lsize + CHK_PER_INODE - 1) / CHK_PER_INODE;
88 GNUNET_assert (lsize > 0);
89 GNUNET_assert (0 == (ioff % CHK_PER_INODE));
90 ioff /= CHK_PER_INODE;
91 }
92 return loff + ioff * sizeof(struct ContentHashKey);
93}
#define DBLOCK_SIZE
Size of the individual blocks used for file-sharing.
Definition: fs.h:41
#define CHK_PER_INODE
Pick a multiple of 2 here to achieve 8-byte alignment! We also probably want DBlocks to have (roughly...
Definition: fs_api.h:44
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
content hash key
Definition: fs.h:55

References CHK_PER_INODE, DBLOCK_SIZE, and GNUNET_assert.

Referenced by process_result_with_request(), and try_top_down_reconstruction().

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◆ GNUNET_FS_download_make_status_()

void GNUNET_FS_download_make_status_ ( struct GNUNET_FS_ProgressInfo pi,
struct GNUNET_FS_DownloadContext dc 
)

Fill in all of the generic fields for a download event and call the callback.

Parameters
pistructure to fill in
dcoverall download context

Definition at line 104 of file fs_download.c.

106{
107 pi->value.download.dc = dc;
108 pi->value.download.cctx = dc->client_info;
109 pi->value.download.pctx =
110 (NULL == dc->parent) ? NULL : dc->parent->client_info;
111 pi->value.download.sctx =
112 (NULL == dc->search) ? NULL : dc->search->client_info;
113 pi->value.download.uri = dc->uri;
114 pi->value.download.filename = dc->filename;
115 pi->value.download.size = dc->length;
116 /* FIXME: Fix duration calculation to account for pauses */
117 pi->value.download.duration =
119 pi->value.download.completed = dc->completed;
120 pi->value.download.anonymity = dc->anonymity;
121 pi->value.download.eta =
123 pi->value.download.is_active = (NULL == dc->mq) ? GNUNET_NO : GNUNET_YES;
124 pi->fsh = dc->h;
126 dc->client_info = dc->h->upcb (dc->h->upcb_cls, pi);
127 else
129}
void * GNUNET_FS_search_probe_progress_(void *cls, const struct GNUNET_FS_ProgressInfo *info)
Notification of FS that a search probe has made progress.
Definition: fs_search.c:281
@ GNUNET_FS_DOWNLOAD_IS_PROBE
Internal option used to flag this download as a 'probe' for a search result.
@ GNUNET_NO
struct GNUNET_TIME_Relative GNUNET_TIME_absolute_get_duration(struct GNUNET_TIME_Absolute whence)
Get the duration of an operation as the difference of the current time and the given start time "henc...
Definition: time.c:436
struct GNUNET_TIME_Relative GNUNET_TIME_calculate_eta(struct GNUNET_TIME_Absolute start, uint64_t finished, uint64_t total)
Calculate the estimate time of arrival/completion for an operation.
Definition: time.c:564
struct GNUNET_FS_Uri * uri
URI that identifies the file that we are downloading.
Definition: fs_api.h:1800
void * client_info
Context kept for the client.
Definition: fs_api.h:1795
uint64_t completed
How many bytes have we already received within the specified range (DBlocks only).
Definition: fs_api.h:1890
struct GNUNET_FS_SearchResult * search
Associated search (used when downloading files based on search results), or NULL for none.
Definition: fs_api.h:1770
uint64_t length
How many bytes starting from offset are desired? This is NOT the overall length of the file!
Definition: fs_api.h:1884
struct GNUNET_MQ_Handle * mq
Connection to the FS service.
Definition: fs_api.h:1758
uint32_t anonymity
Desired level of anonymity.
Definition: fs_api.h:1913
struct GNUNET_FS_DownloadContext * parent
Parent download (used when downloading files in directories).
Definition: fs_api.h:1764
struct GNUNET_FS_Handle * h
Global FS context.
Definition: fs_api.h:1748
struct GNUNET_TIME_Absolute start_time
Time download was started.
Definition: fs_api.h:1903
void * upcb_cls
Closure for upcb.
Definition: fs_api.h:1089
GNUNET_FS_ProgressCallback upcb
Function to call with updates on our progress.
Definition: fs_api.h:1084
struct GNUNET_FS_ProgressInfo::@21::GNUNET_FS_DownloadStatusEvent download
struct GNUNET_FS_Handle * fsh
File-sharing handle that generated the event.
union GNUNET_FS_ProgressInfo::@21 value
Values that depend on the event type.
void * client_info
Client info for this search result.
Definition: fs_api.h:534

References GNUNET_FS_DownloadContext::anonymity, GNUNET_FS_SearchResult::client_info, GNUNET_FS_DownloadContext::client_info, GNUNET_FS_DownloadContext::completed, dc, GNUNET_FS_ProgressInfo::download, GNUNET_FS_DownloadContext::filename, GNUNET_FS_ProgressInfo::fsh, GNUNET_FS_DOWNLOAD_IS_PROBE, GNUNET_FS_search_probe_progress_(), GNUNET_NO, GNUNET_TIME_absolute_get_duration(), GNUNET_TIME_calculate_eta(), GNUNET_YES, GNUNET_FS_DownloadContext::h, GNUNET_FS_DownloadContext::length, GNUNET_FS_DownloadContext::mq, GNUNET_FS_DownloadContext::options, GNUNET_FS_DownloadContext::parent, GNUNET_FS_DownloadContext::search, GNUNET_FS_DownloadContext::start_time, GNUNET_FS_Handle::upcb, GNUNET_FS_Handle::upcb_cls, GNUNET_FS_DownloadContext::uri, and GNUNET_FS_ProgressInfo::value.

Referenced by activate_fs_download(), check_completed(), deactivate_fs_download(), GNUNET_FS_download_resume(), GNUNET_FS_download_signal_suspend_(), GNUNET_FS_download_start_task_(), GNUNET_FS_download_stop(), process_result_with_request(), reconstruct_cb(), search_result_stop(), signal_download_resume(), and try_match_block().

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◆ process_result_with_request()

static int process_result_with_request ( void *  cls,
const struct GNUNET_HashCode key,
void *  value 
)
static

Iterator over entries in the pending requests in the 'active' map for the reply that we just got.

Parameters
clsclosure (our struct ProcessResultClosure)
keyquery for the given value / request
valuevalue in the hash map (a struct DownloadRequest)
Returns
GNUNET_YES (we should continue to iterate); unless serious error

Definition at line 1009 of file fs_download.c.

1012{
1013 struct ProcessResultClosure *prc = cls;
1014 struct DownloadRequest *dr = value;
1015 struct GNUNET_FS_DownloadContext *dc = prc->dc;
1016 struct DownloadRequest *drc;
1017 struct GNUNET_DISK_FileHandle *fh = NULL;
1020 char pt[prc->size];
1021 struct GNUNET_FS_ProgressInfo pi;
1022 uint64_t off;
1023 size_t bs;
1024 size_t app;
1025 int i;
1026 struct ContentHashKey *chkarr;
1027
1028 GNUNET_log (
1030 "Received %u byte block `%s' matching pending request at depth %u and offset %llu/%llu\n",
1031 (unsigned int) prc->size,
1032 GNUNET_h2s (key),
1033 dr->depth,
1034 (unsigned long long) dr->offset,
1035 (unsigned long long) GNUNET_ntohll (dc->uri->data.chk.file_length));
1038 dr->offset,
1039 dr->depth);
1040 if (prc->size != bs)
1041 {
1043 &dc->emsg,
1044 "Internal error or bogus download URI (expected %llu bytes at depth %u and offset %llu/%llu, got %llu bytes)",
1045 (unsigned long long) bs,
1046 dr->depth,
1047 (unsigned long long) dr->offset,
1048 (unsigned long long) GNUNET_ntohll (dc->uri->data.chk.file_length),
1049 (unsigned long long) prc->size);
1051 while (NULL != dr->parent)
1052 {
1053 dr->state = BRS_ERROR;
1054 dr = dr->parent;
1055 }
1056 dr->state = BRS_ERROR;
1057 goto signal_error;
1058 }
1059
1061 GNUNET_CRYPTO_hash_to_aes_key (&dr->chk.key, &skey, &iv);
1062 if (-1 ==
1063 GNUNET_CRYPTO_symmetric_decrypt (prc->data, prc->size, &skey, &iv, pt))
1064 {
1065 GNUNET_break (0);
1066 dc->emsg = GNUNET_strdup (_ ("internal error decrypting content"));
1067 goto signal_error;
1068 }
1070 dr->offset,
1071 dr->depth);
1072 /* save to disk */
1073 if ((GNUNET_YES == prc->do_store) &&
1074 ((NULL != dc->filename) || (is_recursive_download (dc))) &&
1075 ((dr->depth == dc->treedepth) ||
1077 {
1078 fh = GNUNET_DISK_file_open (NULL != dc->filename ? dc->filename
1079 : dc->temp_filename,
1086 if (NULL == fh)
1087 {
1089 _ ("Download failed: could not open file `%s': %s"),
1090 dc->filename,
1091 strerror (errno));
1092 goto signal_error;
1093 }
1095 "Saving decrypted block to disk at offset %llu\n",
1096 (unsigned long long) off);
1097 if ((off != GNUNET_DISK_file_seek (fh, off, GNUNET_DISK_SEEK_SET)))
1098 {
1100 _ ("Failed to seek to offset %llu in file `%s': %s"),
1101 (unsigned long long) off,
1102 dc->filename,
1103 strerror (errno));
1104 goto signal_error;
1105 }
1106 if (prc->size != GNUNET_DISK_file_write (fh, pt, prc->size))
1107 {
1109 &dc->emsg,
1110 _ ("Failed to write block of %u bytes at offset %llu in file `%s': %s"),
1111 (unsigned int) prc->size,
1112 (unsigned long long) off,
1113 dc->filename,
1114 strerror (errno));
1115 goto signal_error;
1116 }
1118 fh = NULL;
1119 }
1120
1121 if (0 == dr->depth)
1122 {
1123 /* DBLOCK, update progress and try recursion if applicable */
1124 app = prc->size;
1125 if (dr->offset < dc->offset)
1126 {
1127 /* starting offset begins in the middle of pt,
1128 * do not count first bytes as progress */
1129 GNUNET_assert (app > (dc->offset - dr->offset));
1130 app -= (dc->offset - dr->offset);
1131 }
1132 if (dr->offset + prc->size > dc->offset + dc->length)
1133 {
1134 /* end of block is after relevant range,
1135 * do not count last bytes as progress */
1136 GNUNET_assert (app >
1137 (dr->offset + prc->size) - (dc->offset + dc->length));
1138 app -= (dr->offset + prc->size) - (dc->offset + dc->length);
1139 }
1140 dc->completed += app;
1141
1142 /* do recursive download if option is set and either meta data
1143 * says it is a directory or if no meta data is given AND filename
1144 * ends in '.gnd' (top-level case) */
1147 pt,
1148 off,
1150 dc);
1151 }
1155 pi.value.download.specifics.progress.data = pt;
1156 pi.value.download.specifics.progress.offset = dr->offset;
1157 pi.value.download.specifics.progress.data_len = prc->size;
1158 pi.value.download.specifics.progress.depth = dr->depth;
1159 pi.value.download.specifics.progress.respect_offered = prc->respect_offered;
1160 pi.value.download.specifics.progress.num_transmissions =
1161 prc->num_transmissions;
1163 GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us)
1164 pi.value.download.specifics.progress.block_download_duration =
1166 else
1167 pi.value.download.specifics.progress.block_download_duration =
1168 GNUNET_TIME_UNIT_ZERO; /* found locally */
1170 if (0 == dr->depth)
1171 propagate_up (dr);
1172
1173 if (dc->completed == dc->length)
1174 {
1175 /* download completed, signal */
1177 "Download completed, truncating file to desired length %llu\n",
1178 (unsigned long long) GNUNET_ntohll (
1180 /* truncate file to size (since we store IBlocks at the end) */
1181 if (NULL != dc->filename)
1182 {
1183 if (0 != truncate (dc->filename,
1186 "truncate",
1187 dc->filename);
1188 }
1189 GNUNET_assert (0 == dr->depth);
1191 }
1192 if (0 == dr->depth)
1193 {
1194 /* bottom of the tree, no child downloads possible, just sync */
1196 return GNUNET_YES;
1197 }
1198
1199 GNUNET_log (
1201 "Triggering downloads of children (this block was at depth %u and offset %llu)\n",
1202 dr->depth,
1203 (unsigned long long) dr->offset);
1204 GNUNET_assert (0 == (prc->size % sizeof(struct ContentHashKey)));
1205 chkarr = (struct ContentHashKey *) pt;
1206 for (i = dr->num_children - 1; i >= 0; i--)
1207 {
1208 drc = dr->children[i];
1209 switch (drc->state)
1210 {
1211 case BRS_INIT:
1212 if ((drc->chk_idx + 1) * sizeof(struct ContentHashKey) > prc->size)
1213 {
1214 /* 'chkarr' does not have enough space for this chk_idx;
1215 internal error! */
1216 GNUNET_break (0);
1217 GNUNET_assert (0);
1218 dc->emsg = GNUNET_strdup (_ ("internal error decoding tree"));
1219 goto signal_error;
1220 }
1221 drc->chk = chkarr[drc->chk_idx];
1222 drc->state = BRS_CHK_SET;
1225 break;
1226
1228 GNUNET_assert (0);
1229 break;
1230
1232 GNUNET_assert (0);
1233 break;
1234
1235 case BRS_RECONSTRUCT_UP:
1236 GNUNET_assert (0);
1237 break;
1238
1239 case BRS_CHK_SET:
1240 GNUNET_assert (0);
1241 break;
1242
1243 case BRS_DOWNLOAD_DOWN:
1244 GNUNET_assert (0);
1245 break;
1246
1247 case BRS_DOWNLOAD_UP:
1248 GNUNET_assert (0);
1249 break;
1250
1251 case BRS_ERROR:
1252 GNUNET_assert (0);
1253 break;
1254
1255 default:
1256 GNUNET_assert (0);
1257 break;
1258 }
1259 }
1261 return GNUNET_YES;
1262
1263signal_error:
1264 if (NULL != fh)
1267 pi.value.download.specifics.error.message = dc->emsg;
1270 dc->mq = NULL;
1272 dc->top_request = NULL;
1273 if (NULL != dc->job_queue)
1274 {
1276 dc->job_queue = NULL;
1277 }
1279 return GNUNET_NO;
1280}
void GNUNET_FS_download_sync_(struct GNUNET_FS_DownloadContext *dc)
Synchronize this download struct with its mirror on disk.
Definition: fs_api.c:2036
void GNUNET_FS_dequeue_(struct GNUNET_FS_QueueEntry *qe)
Dequeue a job from the queue.
Definition: fs_api.c:356
@ BRS_DOWNLOAD_UP
This block and all of its children have been downloaded successfully (full completion propagates up).
Definition: fs_api.h:1661
@ BRS_RECONSTRUCT_META_UP
We've calculated the CHK bottom-up based on the meta data.
Definition: fs_api.h:1629
@ BRS_CHK_SET
We've determined the real, desired CHK for this block (full tree reconstruction failed),...
Definition: fs_api.h:1646
@ BRS_ERROR
We got a block back that matched the query but did not hash to the key (malicious publisher or hash c...
Definition: fs_api.h:1668
@ BRS_RECONSTRUCT_DOWN
We've checked the block on the path down the tree, and the content on disk did match the desired CHK,...
Definition: fs_api.h:1621
@ BRS_INIT
Initial state, block has only been allocated (since it is relevant to the overall download request).
Definition: fs_api.h:1613
@ BRS_DOWNLOAD_DOWN
We've successfully downloaded this block, but the children still need to be either downloaded or veri...
Definition: fs_api.h:1655
@ BRS_RECONSTRUCT_UP
We've calculated the CHK bottom-up based on what we have on disk, which may not be what the desired C...
Definition: fs_api.h:1637
static void propagate_up(struct DownloadRequest *dr)
Set the state of the given download request to BRS_DOWNLOAD_UP and propagate it up the tree.
Definition: fs_download.c:634
static void check_completed(struct GNUNET_FS_DownloadContext *dc)
Check if all child-downloads have completed (or trigger them if necessary) and once we're completely ...
Definition: fs_download.c:376
void GNUNET_FS_free_download_request_(struct DownloadRequest *dr)
(recursively) free download request structure
Definition: fs_download.c:997
void GNUNET_FS_download_make_status_(struct GNUNET_FS_ProgressInfo *pi, struct GNUNET_FS_DownloadContext *dc)
Fill in all of the generic fields for a download event and call the callback.
Definition: fs_download.c:104
static int is_recursive_download(struct GNUNET_FS_DownloadContext *dc)
Determine if the given download (options and meta data) should cause use to try to do a recursive dow...
Definition: fs_download.c:38
static void trigger_recursive_download(void *cls, const char *filename, const struct GNUNET_FS_Uri *uri, const struct GNUNET_FS_MetaData *meta, size_t length, const void *data)
We found an entry in a directory.
Definition: fs_download.c:851
static uint64_t compute_disk_offset(uint64_t fsize, uint64_t off, unsigned int depth)
We're storing the IBLOCKS after the DBLOCKS on disk (so that we only have to truncate the file once w...
Definition: fs_download.c:68
static void schedule_block_download(struct GNUNET_FS_DownloadContext *dc, struct DownloadRequest *dr)
Schedule the download of the specified block in the tree.
Definition: fs_download.c:778
size_t GNUNET_FS_tree_calculate_block_size(uint64_t fsize, uint64_t offset, unsigned int depth)
Compute how many bytes of data should be stored in the specified block.
Definition: fs_tree.c:211
struct GNUNET_HashCode key
The key used in the DHT.
static char * value
Value of the record to add/remove.
ssize_t GNUNET_CRYPTO_symmetric_decrypt(const void *block, size_t size, const struct GNUNET_CRYPTO_SymmetricSessionKey *sessionkey, const struct GNUNET_CRYPTO_SymmetricInitializationVector *iv, void *result)
Decrypt a given block using a symmetric sessionkey.
struct GNUNET_DISK_FileHandle * GNUNET_DISK_file_open(const char *fn, enum GNUNET_DISK_OpenFlags flags, enum GNUNET_DISK_AccessPermissions perm)
Open a file.
Definition: disk.c:1237
ssize_t GNUNET_DISK_file_write(const struct GNUNET_DISK_FileHandle *h, const void *buffer, size_t n)
Write a buffer to a file.
Definition: disk.c:686
off_t GNUNET_DISK_file_seek(const struct GNUNET_DISK_FileHandle *h, off_t offset, enum GNUNET_DISK_Seek whence)
Move the read/write pointer in a file.
Definition: disk.c:205
enum GNUNET_GenericReturnValue GNUNET_DISK_file_close(struct GNUNET_DISK_FileHandle *h)
Close an open file.
Definition: disk.c:1308
@ GNUNET_DISK_OPEN_CREATE
Create file if it doesn't exist.
@ GNUNET_DISK_OPEN_READWRITE
Open the file for both reading and writing.
@ GNUNET_DISK_PERM_USER_READ
Owner can read.
@ GNUNET_DISK_PERM_GROUP_READ
Group can read.
@ GNUNET_DISK_PERM_USER_WRITE
Owner can write.
@ GNUNET_DISK_PERM_OTHER_READ
Everybody can read.
@ GNUNET_DISK_SEEK_SET
Seek an absolute position (from the start of the file).
int GNUNET_FS_directory_list_contents(size_t size, const void *data, uint64_t offset, GNUNET_FS_DirectoryEntryProcessor dep, void *dep_cls)
Iterate over all entries in a directory.
Definition: fs_directory.c:182
@ GNUNET_FS_DOWNLOAD_NO_TEMPORARIES
Do not append temporary data to the target file (for the IBlocks).
@ GNUNET_FS_STATUS_DOWNLOAD_ERROR
Notification that this download encountered an error.
@ GNUNET_FS_STATUS_DOWNLOAD_PROGRESS
Notification about progress with this download.
void GNUNET_CRYPTO_hash_to_aes_key(const struct GNUNET_HashCode *hc, struct GNUNET_CRYPTO_SymmetricSessionKey *skey, struct GNUNET_CRYPTO_SymmetricInitializationVector *iv)
Convert a hashcode into a key.
Definition: crypto_hash.c:152
enum GNUNET_GenericReturnValue GNUNET_CONTAINER_multihashmap_remove(struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key, const void *value)
Remove the given key-value pair from the map.
#define GNUNET_log(kind,...)
uint64_t GNUNET_ntohll(uint64_t n)
Convert unsigned 64-bit integer to host byte order.
Definition: common_endian.c:54
@ GNUNET_OK
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
const char * GNUNET_h2s(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
#define GNUNET_log_strerror_file(level, cmd, filename)
Log an error message at log-level 'level' that indicates a failure of the command 'cmd' with the mess...
@ GNUNET_ERROR_TYPE_WARNING
@ GNUNET_ERROR_TYPE_DEBUG
int int GNUNET_asprintf(char **buf, const char *format,...) __attribute__((format(printf
Like asprintf, just portable.
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
void GNUNET_MQ_destroy(struct GNUNET_MQ_Handle *mq)
Destroy the message queue.
Definition: mq.c:683
#define GNUNET_TIME_UNIT_ZERO
Relative time zero.
#define GNUNET_TIME_UNIT_FOREVER_ABS
Constant used to specify "forever".
static unsigned int size
Size of the "table".
Definition: peer.c:68
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
struct GNUNET_HashCode key
Hash of the original content, used for encryption.
Definition: fs.h:59
Information about an active download request.
Definition: fs_api.h:1676
struct DownloadRequest ** children
Array (!) of child-requests, or NULL for the bottom of the tree.
Definition: fs_api.h:1685
unsigned int chk_idx
Offset of the CHK for this block in the parent block.
Definition: fs_api.h:1713
unsigned int num_children
Number of entries in children array.
Definition: fs_api.h:1703
uint64_t offset
Offset of the corresponding block.
Definition: fs_api.h:1698
enum BlockRequestState state
State in the FSM.
Definition: fs_api.h:1718
unsigned int depth
Depth of the corresponding block in the tree.
Definition: fs_api.h:1708
struct DownloadRequest * parent
Parent in the CHK-tree.
Definition: fs_api.h:1680
struct ContentHashKey chk
CHK for the request for this block (set during reconstruction to what we have on disk,...
Definition: fs_api.h:1691
uint64_t file_length
Total size of the file in bytes.
Definition: fs_api.h:99
Handle used to access files (and pipes).
Context for controlling a download.
Definition: fs_api.h:1744
unsigned int treedepth
The depth of the file-tree.
Definition: fs_api.h:1918
int issue_requests
Are we ready to issue requests (reconstructions are finished)?
Definition: fs_api.h:1935
uint64_t offset
What is the first offset that we're interested in?
Definition: fs_api.h:1878
struct GNUNET_FS_QueueEntry * job_queue
Our entry in the job queue.
Definition: fs_api.h:1834
char * emsg
Error message, NULL if we're doing OK.
Definition: fs_api.h:1810
struct GNUNET_CONTAINER_MultiHashMap * active
Map of active requests (those waiting for a response).
Definition: fs_api.h:1851
char * temp_filename
Where are we writing the data temporarily (name of the file, can be NULL!); used if we do not have a ...
Definition: fs_api.h:1829
struct DownloadRequest * top_request
Top-level download request.
Definition: fs_api.h:1856
Argument given to the progress callback with information about what is going on.
union GNUNET_FS_Uri::@49 data
struct FileIdentifier chk
Information needed to retrieve a file (content-hash-key plus file size).
Definition: fs_api.h:212
uint64_t abs_value_us
The actual value.
Closure for iterator processing results.
Definition: fs_download.c:136
uint32_t respect_offered
how much respect did we offer to get this reply?
Definition: fs_download.c:175
size_t size
Number of bytes in data.
Definition: fs_download.c:160
int do_store
Flag to indicate if this block should be stored on disk.
Definition: fs_download.c:170
struct GNUNET_FS_DownloadContext * dc
Our download context.
Definition: fs_download.c:150
struct GNUNET_TIME_Absolute last_transmission
When did we last transmit the request?
Definition: fs_download.c:155
const void * data
Data found in P2P network.
Definition: fs_download.c:145
uint32_t num_transmissions
how often did we transmit the query?
Definition: fs_download.c:180
struct GNUNET_HashCode query
Hash of data.
Definition: fs_download.c:140

References _, GNUNET_TIME_Absolute::abs_value_us, GNUNET_FS_DownloadContext::active, BRS_CHK_SET, BRS_DOWNLOAD_DOWN, BRS_DOWNLOAD_UP, BRS_ERROR, BRS_INIT, BRS_RECONSTRUCT_DOWN, BRS_RECONSTRUCT_META_UP, BRS_RECONSTRUCT_UP, check_completed(), DownloadRequest::children, GNUNET_FS_Uri::chk, DownloadRequest::chk, DownloadRequest::chk_idx, GNUNET_FS_DownloadContext::completed, compute_disk_offset(), GNUNET_FS_Uri::data, ProcessResultClosure::data, dc, ProcessResultClosure::dc, DownloadRequest::depth, ProcessResultClosure::do_store, GNUNET_FS_ProgressInfo::download, GNUNET_FS_DownloadContext::emsg, FileIdentifier::file_length, GNUNET_FS_DownloadContext::filename, GNUNET_asprintf(), GNUNET_assert, GNUNET_break, GNUNET_CONTAINER_multihashmap_remove(), GNUNET_CRYPTO_hash_to_aes_key(), GNUNET_CRYPTO_symmetric_decrypt(), GNUNET_DISK_file_close(), GNUNET_DISK_file_open(), GNUNET_DISK_file_seek(), GNUNET_DISK_file_write(), GNUNET_DISK_OPEN_CREATE, GNUNET_DISK_OPEN_READWRITE, GNUNET_DISK_PERM_GROUP_READ, GNUNET_DISK_PERM_OTHER_READ, GNUNET_DISK_PERM_USER_READ, GNUNET_DISK_PERM_USER_WRITE, GNUNET_DISK_SEEK_SET, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_FS_dequeue_(), GNUNET_FS_directory_list_contents(), GNUNET_FS_download_make_status_(), GNUNET_FS_DOWNLOAD_NO_TEMPORARIES, GNUNET_FS_download_sync_(), GNUNET_FS_free_download_request_(), GNUNET_FS_STATUS_DOWNLOAD_ERROR, GNUNET_FS_STATUS_DOWNLOAD_PROGRESS, GNUNET_FS_tree_calculate_block_size(), GNUNET_h2s(), GNUNET_log, GNUNET_log_strerror_file, GNUNET_MQ_destroy(), GNUNET_NO, GNUNET_ntohll(), GNUNET_OK, GNUNET_strdup, GNUNET_TIME_absolute_get_duration(), GNUNET_TIME_UNIT_FOREVER_ABS, GNUNET_TIME_UNIT_ZERO, GNUNET_YES, is_recursive_download(), GNUNET_FS_DownloadContext::issue_requests, GNUNET_FS_DownloadContext::job_queue, key, ContentHashKey::key, ProcessResultClosure::last_transmission, GNUNET_FS_DownloadContext::length, GNUNET_FS_DownloadContext::mq, DownloadRequest::num_children, ProcessResultClosure::num_transmissions, DownloadRequest::offset, GNUNET_FS_DownloadContext::offset, GNUNET_FS_DownloadContext::options, DownloadRequest::parent, propagate_up(), ProcessResultClosure::query, ProcessResultClosure::respect_offered, schedule_block_download(), size, ProcessResultClosure::size, DownloadRequest::state, GNUNET_FS_ProgressInfo::status, GNUNET_FS_DownloadContext::temp_filename, GNUNET_FS_DownloadContext::top_request, GNUNET_FS_DownloadContext::treedepth, trigger_recursive_download(), GNUNET_FS_DownloadContext::uri, value, and GNUNET_FS_ProgressInfo::value.

Referenced by encrypt_existing_match(), and handle_put().

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◆ encrypt_existing_match()

static int encrypt_existing_match ( struct GNUNET_FS_DownloadContext dc,
const struct ContentHashKey chk,
struct DownloadRequest dr,
const char *  block,
size_t  len,
int  do_store 
)
static

We've found a matching block without downloading it.

Encrypt it and pass it to our "receive" function as if we had received it from the network.

Parameters
dcdownload in question
chkrequest this relates to
drrequest details
blockplaintext data matching request
lennumber of bytes in block
do_storeshould we still store the block on disk?
Returns
GNUNET_OK on success

Definition at line 213 of file fs_download.c.

219{
220 struct ProcessResultClosure prc;
221 char enc[len];
224 struct GNUNET_HashCode query;
225
226 GNUNET_CRYPTO_hash_to_aes_key (&chk->key, &sk, &iv);
227 if (-1 == GNUNET_CRYPTO_symmetric_encrypt (block, len, &sk, &iv, enc))
228 {
229 GNUNET_break (0);
230 return GNUNET_SYSERR;
231 }
232 GNUNET_CRYPTO_hash (enc, len, &query);
233 if (0 != memcmp (&query, &chk->query, sizeof(struct GNUNET_HashCode)))
234 {
235 GNUNET_break_op (0);
236 return GNUNET_SYSERR;
237 }
238 GNUNET_log (
240 "Matching %u byte block for `%s' at offset %llu already present, no need for download!\n",
241 (unsigned int) len,
242 dc->filename,
243 (unsigned long long) dr->offset);
244 /* already got it! */
245 prc.dc = dc;
246 prc.data = enc;
247 prc.size = len;
248 prc.type = (0 == dr->depth) ? GNUNET_BLOCK_TYPE_FS_DBLOCK
250 prc.query = chk->query;
251 prc.do_store = do_store;
252 prc.last_transmission = GNUNET_TIME_UNIT_FOREVER_ABS;
253 process_result_with_request (&prc, &chk->key, dr);
254 return GNUNET_OK;
255}
static int process_result_with_request(void *cls, const struct GNUNET_HashCode *key, void *value)
Iterator over entries in the pending requests in the 'active' map for the reply that we just got.
Definition: fs_download.c:1009
static OpusEncoder * enc
OPUS encoder.
ssize_t GNUNET_CRYPTO_symmetric_encrypt(const void *block, size_t size, const struct GNUNET_CRYPTO_SymmetricSessionKey *sessionkey, const struct GNUNET_CRYPTO_SymmetricInitializationVector *iv, void *result)
Encrypt a block using a symmetric sessionkey.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:41
@ GNUNET_SYSERR
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
@ GNUNET_BLOCK_TYPE_FS_DBLOCK
Data block (leaf) in the CHK tree.
@ GNUNET_BLOCK_TYPE_FS_IBLOCK
Inner block in the CHK tree.
struct GNUNET_HashCode query
Hash of the encrypted content, used for querying.
Definition: fs.h:64
A 512-bit hashcode.

References ProcessResultClosure::data, dc, ProcessResultClosure::dc, DownloadRequest::depth, ProcessResultClosure::do_store, enc, GNUNET_FS_DownloadContext::filename, GNUNET_BLOCK_TYPE_FS_DBLOCK, GNUNET_BLOCK_TYPE_FS_IBLOCK, GNUNET_break, GNUNET_break_op, GNUNET_CRYPTO_hash(), GNUNET_CRYPTO_hash_to_aes_key(), GNUNET_CRYPTO_symmetric_encrypt(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_OK, GNUNET_SYSERR, GNUNET_TIME_UNIT_FOREVER_ABS, ContentHashKey::key, ProcessResultClosure::last_transmission, DownloadRequest::offset, process_result_with_request(), ContentHashKey::query, ProcessResultClosure::query, ProcessResultClosure::size, and ProcessResultClosure::type.

Referenced by try_top_down_reconstruction().

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◆ try_reconnect()

static void try_reconnect ( struct GNUNET_FS_DownloadContext dc)
static

We've lost our connection with the FS service.

Re-establish it and re-transmit all of our pending requests.

Parameters
dcdownload context that is having trouble

Definition at line 1397 of file fs_download.c.

1398{
1399 if (NULL != dc->mq)
1400 {
1402 "Moving all requests back to pending list\n");
1404 dc->mq = NULL;
1405 }
1408 else
1410
1412 "Will try to reconnect in %s\n",
1414 GNUNET_YES));
1415 GNUNET_break (NULL != dc->job_queue);
1416 dc->task =
1418}
static void do_reconnect(void *cls)
Reconnect to the FS service and transmit our queries NOW.
Definition: fs_download.c:1361
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1278
const char * GNUNET_STRINGS_relative_time_to_string(struct GNUNET_TIME_Relative delta, int do_round)
Give relative time in human-readable fancy format.
Definition: strings.c:570
#define GNUNET_TIME_UNIT_MILLISECONDS
One millisecond.
#define GNUNET_TIME_STD_BACKOFF(r)
Perform our standard exponential back-off calculation, starting at 1 ms and then going by a factor of...
struct GNUNET_SCHEDULER_Task * task
ID of a task that is using this struct and that must be cancelled when the download is being stopped ...
Definition: fs_api.h:1872
struct GNUNET_TIME_Relative reconnect_backoff
How long to wait before we try to reconnect to FS service?
Definition: fs_api.h:1908
uint64_t rel_value_us
The actual value.

References dc, do_reconnect(), GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_MQ_destroy(), GNUNET_SCHEDULER_add_delayed(), GNUNET_STRINGS_relative_time_to_string(), GNUNET_TIME_STD_BACKOFF, GNUNET_TIME_UNIT_MILLISECONDS, GNUNET_YES, GNUNET_FS_DownloadContext::job_queue, GNUNET_FS_DownloadContext::mq, GNUNET_FS_DownloadContext::reconnect_backoff, GNUNET_TIME_Relative::rel_value_us, and GNUNET_FS_DownloadContext::task.

Referenced by do_reconnect(), and download_mq_error_handler().

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◆ trigger_recursive_download()

static void trigger_recursive_download ( void *  cls,
const char *  filename,
const struct GNUNET_FS_Uri uri,
const struct GNUNET_FS_MetaData meta,
size_t  length,
const void *  data 
)
static

We found an entry in a directory.

Check if the respective child already exists and if not create the respective child download.

Parameters
clsthe parent download
filenamename of the file in the directory
uriURI of the file (CHK or LOC)
metameta data of the file
lengthnumber of bytes in data
datacontents of the file (or NULL if they were not inlined)

Definition at line 851 of file fs_download.c.

857{
858 struct GNUNET_FS_DownloadContext *dc = cls;
859 struct GNUNET_FS_DownloadContext *cpos;
860 char *temp_name;
861 char *fn;
862 char *us;
863 char *ext;
864 char *dn;
865 char *pos;
866 char *full_name;
867 char *sfn;
868
869 if (NULL == uri)
870 return; /* entry for the directory itself */
871 cpos = dc->child_head;
872 while (NULL != cpos)
873 {
874 if ((GNUNET_FS_uri_test_equal (uri, cpos->uri)) ||
875 ((NULL != filename) && (0 == strcmp (cpos->filename, filename))))
876 break;
877 cpos = cpos->next;
878 }
879 if (NULL != cpos)
880 return; /* already exists */
881 fn = NULL;
882 if (NULL == filename)
883 {
885 if (NULL == fn)
886 {
888 fn = GNUNET_strdup (&us[strlen (GNUNET_FS_URI_CHK_PREFIX)]);
889 GNUNET_free (us);
890 }
891 else if ('.' == fn[0])
892 {
893 ext = fn;
895 GNUNET_asprintf (&fn,
896 "%s%s",
897 &us[strlen (GNUNET_FS_URI_CHK_PREFIX)],
898 ext);
899 GNUNET_free (ext);
900 GNUNET_free (us);
901 }
902 /* change '\' to '/' (this should have happened
903 * during insertion, but malicious peers may
904 * not have done this) */
905 while (NULL != (pos = strstr (fn, "\\")))
906 *pos = '/';
907 /* remove '../' everywhere (again, well-behaved
908 * peers don't do this, but don't trust that
909 * we did not get something nasty) */
910 while (NULL != (pos = strstr (fn, "../")))
911 {
912 pos[0] = '_';
913 pos[1] = '_';
914 pos[2] = '_';
915 }
916 filename = fn;
917 }
918 if (NULL == dc->filename)
919 {
920 full_name = NULL;
921 }
922 else
923 {
924 dn = GNUNET_strdup (dc->filename);
926 (strlen (dn) >= strlen (GNUNET_FS_DIRECTORY_EXT)) &&
927 (NULL != strstr (dn + strlen (dn) - strlen (GNUNET_FS_DIRECTORY_EXT),
929 sfn = GNUNET_strdup (filename);
930 while ((strlen (sfn) > 0) && ('/' == filename[strlen (sfn) - 1]))
931 sfn[strlen (sfn) - 1] = '\0';
932 if ((strlen (dn) >= strlen (GNUNET_FS_DIRECTORY_EXT)) &&
933 (NULL != strstr (dn + strlen (dn) - strlen (GNUNET_FS_DIRECTORY_EXT),
935 dn[strlen (dn) - strlen (GNUNET_FS_DIRECTORY_EXT)] = '\0';
937 ((strlen (filename) < strlen (GNUNET_FS_DIRECTORY_EXT)) ||
938 (NULL == strstr (filename + strlen (filename)
939 - strlen (GNUNET_FS_DIRECTORY_EXT),
941 {
942 GNUNET_asprintf (&full_name,
943 "%s%s%s%s",
944 dn,
946 sfn,
948 }
949 else
950 {
951 GNUNET_asprintf (&full_name, "%s%s%s", dn, DIR_SEPARATOR_STR, sfn);
952 }
953 GNUNET_free (sfn);
954 GNUNET_free (dn);
955 }
956 if ((NULL != full_name) &&
958 {
960 _ (
961 "Failed to create directory for recursive download of `%s'\n"),
962 full_name);
963 GNUNET_free (full_name);
964 GNUNET_free (fn);
965 return;
966 }
967
968 temp_name = NULL;
970 "Triggering recursive download of size %llu with %u bytes MD\n",
971 (unsigned long long) GNUNET_FS_uri_chk_get_file_size (uri),
973 meta));
975 uri,
976 meta,
977 full_name,
978 temp_name,
979 0,
981 dc->anonymity,
982 dc->options,
983 NULL,
984 dc);
985 GNUNET_free (full_name);
986 GNUNET_free (temp_name);
987 GNUNET_free (fn);
988}
#define GNUNET_FS_URI_CHK_PREFIX
Definition: fs_download.c:837
static char * filename
static struct GNUNET_FS_Uri * uri
Value of URI provided on command-line (when not publishing a file but just creating UBlocks to refer ...
static struct GNUNET_FS_MetaData * meta
Meta-data provided via command-line option.
enum GNUNET_GenericReturnValue GNUNET_DISK_directory_create_for_file(const char *filename)
Create the directory structure for storing a file.
Definition: disk.c:582
uint64_t GNUNET_FS_uri_chk_get_file_size(const struct GNUNET_FS_Uri *uri)
What is the size of the file that this URI refers to?
Definition: fs_uri.c:1360
int GNUNET_FS_uri_test_equal(const struct GNUNET_FS_Uri *u1, const struct GNUNET_FS_Uri *u2)
Test if two URIs are equal.
Definition: fs_uri.c:1201
struct GNUNET_FS_DownloadContext * GNUNET_FS_download_start(struct GNUNET_FS_Handle *h, const struct GNUNET_FS_Uri *uri, const struct GNUNET_FS_MetaData *meta, const char *filename, const char *tempname, uint64_t offset, uint64_t length, uint32_t anonymity, enum GNUNET_FS_DownloadOptions options, void *cctx, struct GNUNET_FS_DownloadContext *parent)
Download parts of a file.
Definition: fs_download.c:2099
char * GNUNET_FS_uri_to_string(const struct GNUNET_FS_Uri *uri)
Convert a URI to a UTF-8 String.
Definition: fs_uri.c:2034
char * GNUNET_FS_meta_data_suggest_filename(const struct GNUNET_FS_MetaData *md)
Suggest a filename based on given metadata.
Definition: fs_misc.c:39
@ GNUNET_ERROR_TYPE_ERROR
#define GNUNET_free(ptr)
Wrapper around free.
ssize_t GNUNET_FS_meta_data_get_serialized_size(const struct GNUNET_FS_MetaData *md)
Get the size of the full meta-data in serialized form.
Definition: meta_data.c:858
#define DIR_SEPARATOR_STR
Definition: platform.h:166
struct GNUNET_FS_DownloadContext * child_head
Head of list of child downloads.
Definition: fs_api.h:1775
struct GNUNET_FS_DownloadContext * next
Next download belonging to the same parent.
Definition: fs_api.h:1790

References _, GNUNET_FS_DownloadContext::anonymity, GNUNET_FS_DownloadContext::child_head, dc, DIR_SEPARATOR_STR, filename, GNUNET_FS_DownloadContext::filename, GNUNET_asprintf(), GNUNET_break, GNUNET_DISK_directory_create_for_file(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_FS_DIRECTORY_EXT, GNUNET_FS_download_start(), GNUNET_FS_meta_data_get_serialized_size(), GNUNET_FS_meta_data_suggest_filename(), GNUNET_FS_meta_data_test_for_directory(), GNUNET_FS_uri_chk_get_file_size(), GNUNET_FS_URI_CHK_PREFIX, GNUNET_FS_uri_test_equal(), GNUNET_FS_uri_to_string(), GNUNET_log, GNUNET_OK, GNUNET_strdup, GNUNET_YES, GNUNET_FS_DownloadContext::h, meta, GNUNET_FS_DownloadContext::next, GNUNET_FS_DownloadContext::options, uri, and GNUNET_FS_DownloadContext::uri.

Referenced by full_recursive_download(), and process_result_with_request().

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◆ full_recursive_download()

static void full_recursive_download ( struct GNUNET_FS_DownloadContext dc)
static

We're done downloading a directory.

Open the file and trigger all of the (remaining) child downloads.

Parameters
dccontext of download that just completed

Definition at line 296 of file fs_download.c.

297{
298 size_t size;
299 uint64_t size64;
300 void *data;
302 struct GNUNET_DISK_MapHandle *m;
303
305 size = (size_t) size64;
306 if (size64 != (uint64_t) size)
307 {
308 GNUNET_log (
310 _ (
311 "Recursive downloads of directories larger than 4 GB are not supported on 32-bit systems\n"));
312 return;
313 }
314 if (NULL != dc->filename)
315 {
319 }
320 else
321 {
322 GNUNET_assert (NULL != dc->temp_filename);
326 }
327 if (NULL == h)
328 return; /* oops */
330 if (NULL == data)
331 {
333 _ ("Directory too large for system address space\n"));
334 }
335 else
336 {
337 if (GNUNET_OK !=
339 data,
340 0,
342 dc))
343 {
344 GNUNET_log (
346 _ (
347 "Failed to access full directory contents of `%s' for recursive download\n"),
348 dc->filename);
349 }
351 }
353 if (NULL == dc->filename)
354 {
355 if (0 != unlink (dc->temp_filename))
357 "unlink",
360 dc->temp_filename = NULL;
361 }
362}
static struct GNUNET_ARM_MonitorHandle * m
Monitor connection with ARM.
Definition: gnunet-arm.c:104
static struct GNUNET_ARM_Handle * h
Connection with ARM.
Definition: gnunet-arm.c:99
static char * data
The data to insert into the dht.
void * GNUNET_DISK_file_map(const struct GNUNET_DISK_FileHandle *h, struct GNUNET_DISK_MapHandle **m, enum GNUNET_DISK_MapType access, size_t len)
Map a file into memory.
Definition: disk.c:1380
enum GNUNET_GenericReturnValue GNUNET_DISK_file_unmap(struct GNUNET_DISK_MapHandle *h)
Unmap a file.
Definition: disk.c:1411
@ GNUNET_DISK_OPEN_READ
Open the file for reading.
@ GNUNET_DISK_PERM_NONE
Nobody is allowed to do anything to the file.
@ GNUNET_DISK_MAP_TYPE_READ
Read-only memory map.
Handle for a memory-mapping operation.
Definition: disk.c:1361

References _, data, dc, GNUNET_FS_DownloadContext::filename, GNUNET_assert, GNUNET_DISK_file_close(), GNUNET_DISK_file_map(), GNUNET_DISK_file_open(), GNUNET_DISK_file_unmap(), GNUNET_DISK_MAP_TYPE_READ, GNUNET_DISK_OPEN_READ, GNUNET_DISK_PERM_NONE, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_FS_directory_list_contents(), GNUNET_FS_uri_chk_get_file_size(), GNUNET_log, GNUNET_log_strerror_file, GNUNET_OK, h, m, size, GNUNET_FS_DownloadContext::temp_filename, trigger_recursive_download(), and GNUNET_FS_DownloadContext::uri.

Referenced by check_completed().

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◆ check_completed()

static void check_completed ( struct GNUNET_FS_DownloadContext dc)
static

Check if all child-downloads have completed (or trigger them if necessary) and once we're completely done, signal completion (and possibly recurse to parent).

This function MUST be called when the download of a file itself is done or when the download of a file is done and then later a direct child download has completed (and hence this download may complete itself).

Parameters
dcdownload to check for completion of children

Definition at line 376 of file fs_download.c.

377{
378 struct GNUNET_FS_ProgressInfo pi;
379 struct GNUNET_FS_DownloadContext *pos;
380
381 /* first, check if we need to download children */
384 /* then, check if children are done already */
385 for (pos = dc->child_head; NULL != pos; pos = pos->next)
386 {
387 if ((NULL == pos->emsg) && (pos->completed < pos->length))
388 return; /* not done yet */
389 if ((NULL != pos->child_head) && (pos->has_finished != GNUNET_YES))
390 return; /* not transitively done yet */
391 }
392 /* All of our children are done, so mark this download done */
394 if (NULL != dc->job_queue)
395 {
397 dc->job_queue = NULL;
398 }
399 if (NULL != dc->task)
400 {
402 dc->task = NULL;
403 }
404 if (NULL != dc->rfh)
405 {
407 dc->rfh = NULL;
408 }
410
411 /* signal completion */
414
415 /* let parent know */
416 if (NULL != dc->parent)
418}
static void full_recursive_download(struct GNUNET_FS_DownloadContext *dc)
We're done downloading a directory.
Definition: fs_download.c:296
@ GNUNET_FS_STATUS_DOWNLOAD_COMPLETED
Notification that this download completed.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:981
int has_finished
Flag set upon transitive completion (includes child downloads).
Definition: fs_api.h:1930
struct GNUNET_DISK_FileHandle * rfh
File handle for reading data from an existing file (to pass to tree encoder).
Definition: fs_api.h:1845

References check_completed(), GNUNET_FS_DownloadContext::child_head, GNUNET_FS_DownloadContext::completed, dc, GNUNET_FS_DownloadContext::emsg, full_recursive_download(), GNUNET_break, GNUNET_DISK_file_close(), GNUNET_FS_dequeue_(), GNUNET_FS_download_make_status_(), GNUNET_FS_download_sync_(), GNUNET_FS_STATUS_DOWNLOAD_COMPLETED, GNUNET_OK, GNUNET_SCHEDULER_cancel(), GNUNET_YES, GNUNET_FS_DownloadContext::has_finished, is_recursive_download(), GNUNET_FS_DownloadContext::job_queue, GNUNET_FS_DownloadContext::length, GNUNET_FS_DownloadContext::next, GNUNET_FS_DownloadContext::parent, GNUNET_FS_DownloadContext::rfh, GNUNET_FS_ProgressInfo::status, and GNUNET_FS_DownloadContext::task.

Referenced by check_completed(), GNUNET_FS_download_start_task_(), process_result_with_request(), reconstruct_cb(), and try_match_block().

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◆ try_match_block()

static void try_match_block ( struct GNUNET_FS_DownloadContext dc,
struct DownloadRequest dr,
const char *  data,
size_t  data_len 
)
static

We got a block of plaintext data (from the meta data).

Try it for upward reconstruction of the data. On success, the top-level block will move to state BRS_DOWNLOAD_UP.

Parameters
dccontext for the download
drdownload request to match against
dataplaintext data, starting from the beginning of the file
data_lennumber of bytes in data

Definition at line 432 of file fs_download.c.

436{
437 struct GNUNET_FS_ProgressInfo pi;
438 unsigned int i;
439 char enc[DBLOCK_SIZE];
440 struct ContentHashKey chks[CHK_PER_INODE];
441 struct ContentHashKey in_chk;
444 size_t dlen;
445 struct DownloadRequest *drc;
446 struct GNUNET_DISK_FileHandle *fh;
447 int complete;
448 const char *fn;
449 const char *odata;
450 size_t odata_len;
451
452 odata = data;
453 odata_len = data_len;
454 if (BRS_DOWNLOAD_UP == dr->state)
455 return;
456 if (dr->depth > 0)
457 {
458 if ((dc->offset > 0) ||
460 {
461 /* NOTE: this test is not tight, but should suffice; the issue
462 here is that 'dr->num_children' may inherently only specify a
463 smaller range than what is in the original file;
464 thus, reconstruction of (some) inner blocks will fail.
465 FIXME: we might eventually want to write a tighter test to
466 maximize the circumstances under which we do succeed with
467 IBlock reconstruction. (need good tests though). */return;
468 }
469 complete = GNUNET_YES;
470 for (i = 0; i < dr->num_children; i++)
471 {
472 drc = dr->children[i];
473 try_match_block (dc, drc, data, data_len);
474 if (drc->state != BRS_RECONSTRUCT_META_UP)
475 complete = GNUNET_NO;
476 else
477 chks[i] = drc->chk;
478 }
479 if (GNUNET_YES != complete)
480 return;
481 data = (const char *) chks;
482 dlen = dr->num_children * sizeof(struct ContentHashKey);
483 }
484 else
485 {
486 if (dr->offset > data_len)
487 return; /* oops */
488 dlen = GNUNET_MIN (data_len - dr->offset, DBLOCK_SIZE);
489 }
490 GNUNET_CRYPTO_hash (&data[dr->offset], dlen, &in_chk.key);
491 GNUNET_CRYPTO_hash_to_aes_key (&in_chk.key, &sk, &iv);
492 if (-1 ==
493 GNUNET_CRYPTO_symmetric_encrypt (&data[dr->offset], dlen, &sk, &iv, enc))
494 {
495 GNUNET_break (0);
496 return;
497 }
498 GNUNET_CRYPTO_hash (enc, dlen, &in_chk.query);
499 switch (dr->state)
500 {
501 case BRS_INIT:
502 dr->chk = in_chk;
504 break;
505
506 case BRS_CHK_SET:
507 if (0 != memcmp (&in_chk, &dr->chk, sizeof(struct ContentHashKey)))
508 {
509 /* other peer provided bogus meta data */
510 GNUNET_break_op (0);
511 break;
512 }
513 /* write block to disk */
514 fn = (NULL != dc->filename) ? dc->filename : dc->temp_filename;
515 if (NULL != fn)
516 {
517 fh = GNUNET_DISK_file_open (fn,
525 if (NULL == fh)
526 {
529 _ ("Failed to open file `%s' for writing"),
530 fn);
532 dr->state = BRS_ERROR;
534 pi.value.download.specifics.error.message = dc->emsg;
536 return;
537 }
538 if (data_len != GNUNET_DISK_file_write (fh, odata, odata_len))
539 {
542 _ ("Failed to open file `%s' for writing"),
543 fn);
545 dr->state = BRS_ERROR;
547 pi.value.download.specifics.error.message = dc->emsg;
549 return;
550 }
552 }
553 /* signal success */
555 dc->completed = dc->length;
558 pi.value.download.specifics.progress.data = data;
559 pi.value.download.specifics.progress.offset = 0;
560 pi.value.download.specifics.progress.data_len = dlen;
561 pi.value.download.specifics.progress.depth = 0;
562 pi.value.download.specifics.progress.respect_offered = 0;
563 pi.value.download.specifics.progress.block_download_duration =
566 if ((NULL != dc->filename) &&
567 (0 != truncate (dc->filename,
570 "truncate",
571 dc->filename);
573 break;
574
575 default:
576 /* how did we get here? */
577 GNUNET_break (0);
578 break;
579 }
580}
static void try_match_block(struct GNUNET_FS_DownloadContext *dc, struct DownloadRequest *dr, const char *data, size_t data_len)
We got a block of plaintext data (from the meta data).
Definition: fs_download.c:432
@ GNUNET_DISK_OPEN_TRUNCATE
Truncate file if it exists.
#define GNUNET_MIN(a, b)

References _, BRS_CHK_SET, BRS_DOWNLOAD_UP, BRS_ERROR, BRS_INIT, BRS_RECONSTRUCT_META_UP, check_completed(), DownloadRequest::children, GNUNET_FS_Uri::chk, DownloadRequest::chk, CHK_PER_INODE, GNUNET_FS_DownloadContext::completed, data, GNUNET_FS_Uri::data, DBLOCK_SIZE, dc, DownloadRequest::depth, GNUNET_FS_ProgressInfo::download, GNUNET_FS_DownloadContext::emsg, enc, FileIdentifier::file_length, GNUNET_FS_DownloadContext::filename, GNUNET_asprintf(), GNUNET_break, GNUNET_break_op, GNUNET_CRYPTO_hash(), GNUNET_CRYPTO_hash_to_aes_key(), GNUNET_CRYPTO_symmetric_encrypt(), GNUNET_DISK_file_close(), GNUNET_DISK_file_open(), GNUNET_DISK_file_write(), GNUNET_DISK_OPEN_CREATE, GNUNET_DISK_OPEN_READWRITE, GNUNET_DISK_OPEN_TRUNCATE, GNUNET_DISK_PERM_GROUP_READ, GNUNET_DISK_PERM_OTHER_READ, GNUNET_DISK_PERM_USER_READ, GNUNET_DISK_PERM_USER_WRITE, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_FS_download_make_status_(), GNUNET_FS_download_sync_(), GNUNET_FS_STATUS_DOWNLOAD_ERROR, GNUNET_FS_STATUS_DOWNLOAD_PROGRESS, GNUNET_log_strerror_file, GNUNET_MIN, GNUNET_NO, GNUNET_ntohll(), GNUNET_TIME_UNIT_ZERO, GNUNET_YES, ContentHashKey::key, GNUNET_FS_DownloadContext::length, DownloadRequest::num_children, DownloadRequest::offset, GNUNET_FS_DownloadContext::offset, ContentHashKey::query, DownloadRequest::state, GNUNET_FS_ProgressInfo::status, GNUNET_FS_DownloadContext::temp_filename, try_match_block(), GNUNET_FS_DownloadContext::uri, and GNUNET_FS_ProgressInfo::value.

Referenced by match_full_data(), and try_match_block().

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◆ match_full_data()

static int match_full_data ( void *  cls,
const char *  plugin_name,
enum EXTRACTOR_MetaType  type,
enum EXTRACTOR_MetaFormat  format,
const char *  data_mime_type,
const char *  data,
size_t  data_len 
)
static

Type of a function that libextractor calls for each meta data item found.

If we find full data meta data, call 'try_match_block' on it.

Parameters
clsour 'struct GNUNET_FS_DownloadContext*'
plugin_namename of the plugin that produced this value; special values can be used (e.g. '<zlib>' for zlib being used in the main libextractor library and yielding meta data).
typelibextractor-type describing the meta data
formatbasic format information about data
data_mime_typemime-type of data (not of the original file); can be NULL (if mime-type is not known)
dataactual meta-data found
data_lennumber of bytes in data
Returns
0 to continue extracting, 1 to abort

Definition at line 602 of file fs_download.c.

609{
610 struct GNUNET_FS_DownloadContext *dc = cls;
611
612 if (EXTRACTOR_METATYPE_GNUNET_FULL_DATA != type)
613 return 0;
615 "Found %u bytes of FD!\n",
616 (unsigned int) data_len);
617 if (GNUNET_FS_uri_chk_get_file_size (dc->uri) != data_len)
618 {
619 GNUNET_break_op (0);
620 return 1; /* bogus meta data */
621 }
622 try_match_block (dc, dc->top_request, data, data_len);
623 return 1;
624}
static uint32_t type
Type string converted to DNS type value.

References data, dc, GNUNET_break_op, GNUNET_ERROR_TYPE_DEBUG, GNUNET_FS_uri_chk_get_file_size(), GNUNET_log, GNUNET_FS_DownloadContext::top_request, try_match_block(), type, and GNUNET_FS_DownloadContext::uri.

Referenced by GNUNET_FS_download_start_task_().

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◆ propagate_up()

static void propagate_up ( struct DownloadRequest dr)
static

Set the state of the given download request to BRS_DOWNLOAD_UP and propagate it up the tree.

Parameters
drdownload request that is done

Definition at line 634 of file fs_download.c.

635{
636 unsigned int i;
637
638 do
639 {
641 dr = dr->parent;
642 if (NULL == dr)
643 break;
644 for (i = 0; i < dr->num_children; i++)
645 if (dr->children[i]->state != BRS_DOWNLOAD_UP)
646 break;
647 }
648 while (i == dr->num_children);
649}

References BRS_DOWNLOAD_UP, DownloadRequest::children, DownloadRequest::num_children, DownloadRequest::parent, and DownloadRequest::state.

Referenced by process_result_with_request(), and try_top_down_reconstruction().

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◆ try_top_down_reconstruction()

static void try_top_down_reconstruction ( struct GNUNET_FS_DownloadContext dc,
struct DownloadRequest dr 
)
static

Try top-down reconstruction.

Before, the given request node must have the state BRS_CHK_SET. Afterwards, more nodes may have that state or advanced to BRS_DOWNLOAD_DOWN or even BRS_DOWNLOAD_UP. It is also possible to get BRS_ERROR on the top level.

Parameters
dcoverall download this block belongs to
drblock to reconstruct

Definition at line 663 of file fs_download.c.

665{
666 uint64_t off;
667 char block[DBLOCK_SIZE];
668 struct GNUNET_HashCode key;
669 uint64_t total;
670 size_t len;
671 unsigned int i;
672 struct DownloadRequest *drc;
673 uint64_t child_block_size;
674 const struct ContentHashKey *chks;
675 int up_done;
676
677 GNUNET_assert (NULL != dc->rfh);
681 len = GNUNET_FS_tree_calculate_block_size (total, dr->offset, dr->depth);
682 GNUNET_assert (len <= DBLOCK_SIZE);
683 off = compute_disk_offset (total, dr->offset, dr->depth);
684 if (dc->old_file_size < off + len)
685 return; /* failure */
687 {
689 return; /* failure */
690 }
691 if (len != GNUNET_DISK_file_read (dc->rfh, block, len))
692 {
694 return; /* failure */
695 }
696 GNUNET_CRYPTO_hash (block, len, &key);
697 if (0 != memcmp (&key, &dr->chk.key, sizeof(struct GNUNET_HashCode)))
698 return; /* mismatch */
699 if (GNUNET_OK !=
700 encrypt_existing_match (dc, &dr->chk, dr, block, len, GNUNET_NO))
701 {
702 /* hash matches but encrypted block does not, really bad */
703 dr->state = BRS_ERROR;
704 /* propagate up */
705 while (NULL != dr->parent)
706 {
707 dr = dr->parent;
708 dr->state = BRS_ERROR;
709 }
710 return;
711 }
712 /* block matches */
714
715 /* set CHKs for children */
716 up_done = GNUNET_YES;
717 chks = (const struct ContentHashKey *) block;
718 for (i = 0; i < dr->num_children; i++)
719 {
720 drc = dr->children[i];
721 GNUNET_assert (drc->offset >= dr->offset);
722 child_block_size = GNUNET_FS_tree_compute_tree_size (drc->depth);
723 GNUNET_assert (0 == (drc->offset - dr->offset) % child_block_size);
724 if (BRS_INIT == drc->state)
725 {
726 drc->state = BRS_CHK_SET;
727 drc->chk = chks[drc->chk_idx];
729 }
730 if (BRS_DOWNLOAD_UP != drc->state)
731 up_done = GNUNET_NO; /* children not all done */
732 }
733 if (GNUNET_YES == up_done)
734 propagate_up (dr); /* children all done (or no children...) */
735}
static void try_top_down_reconstruction(struct GNUNET_FS_DownloadContext *dc, struct DownloadRequest *dr)
Try top-down reconstruction.
Definition: fs_download.c:663
static int encrypt_existing_match(struct GNUNET_FS_DownloadContext *dc, const struct ContentHashKey *chk, struct DownloadRequest *dr, const char *block, size_t len, int do_store)
We've found a matching block without downloading it.
Definition: fs_download.c:213
uint64_t GNUNET_FS_tree_compute_tree_size(unsigned int depth)
Calculate how many bytes of payload a block tree of the given depth MAY correspond to at most (this f...
Definition: fs_tree.c:156
ssize_t GNUNET_DISK_file_read(const struct GNUNET_DISK_FileHandle *h, void *result, size_t len)
Read the contents of a binary file into a buffer.
Definition: disk.c:622
uint64_t old_file_size
What was the size of the file on disk that we're downloading before we started? Used to detect if the...
Definition: fs_api.h:1898

References BRS_CHK_SET, BRS_DOWNLOAD_DOWN, BRS_DOWNLOAD_UP, BRS_ERROR, BRS_INIT, DownloadRequest::children, DownloadRequest::chk, DownloadRequest::chk_idx, compute_disk_offset(), DBLOCK_SIZE, dc, DownloadRequest::depth, encrypt_existing_match(), GNUNET_FS_DownloadContext::filename, GNUNET_assert, GNUNET_CRYPTO_hash(), GNUNET_DISK_file_read(), GNUNET_DISK_file_seek(), GNUNET_DISK_SEEK_SET, GNUNET_ERROR_TYPE_WARNING, GNUNET_FS_tree_calculate_block_size(), GNUNET_FS_tree_compute_tree_size(), GNUNET_FS_uri_chk_get_file_size(), GNUNET_log_strerror_file, GNUNET_NO, GNUNET_OK, GNUNET_YES, key, ContentHashKey::key, DownloadRequest::num_children, DownloadRequest::offset, GNUNET_FS_DownloadContext::old_file_size, DownloadRequest::parent, propagate_up(), GNUNET_FS_DownloadContext::rfh, DownloadRequest::state, GNUNET_FS_DownloadContext::treedepth, try_top_down_reconstruction(), and GNUNET_FS_DownloadContext::uri.

Referenced by GNUNET_FS_download_start_task_(), and try_top_down_reconstruction().

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◆ retry_entry()

static int retry_entry ( void *  cls,
const struct GNUNET_HashCode key,
void *  entry 
)
static

Add entries to the message queue.

Parameters
clsour download context
keyunused
entryentry of type struct DownloadRequest
Returns
GNUNET_OK

Definition at line 747 of file fs_download.c.

748{
749 struct GNUNET_FS_DownloadContext *dc = cls;
750 struct DownloadRequest *dr = entry;
751 struct SearchMessage *sm;
752 struct GNUNET_MQ_Envelope *env;
753
757 else
759 if (0 == dr->depth)
760 sm->type = htonl (GNUNET_BLOCK_TYPE_FS_DBLOCK);
761 else
762 sm->type = htonl (GNUNET_BLOCK_TYPE_FS_IBLOCK);
763 sm->anonymity_level = htonl (dc->anonymity);
764 sm->target = dc->target;
765 sm->query = dr->chk.query;
767 return GNUNET_OK;
768}
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
@ GNUNET_FS_SEARCH_OPTION_LOOPBACK_ONLY
Only search the local host, do not search remote systems (no P2P)
@ GNUNET_FS_SEARCH_OPTION_NONE
No options (use defaults for everything).
@ GNUNET_FS_DOWNLOAD_OPTION_LOOPBACK_ONLY
Only download from the local host, do not access remote systems (no P2P)
void GNUNET_MQ_send(struct GNUNET_MQ_Handle *mq, struct GNUNET_MQ_Envelope *ev)
Send a message with the given message queue.
Definition: mq.c:304
#define GNUNET_MQ_msg(mvar, type)
Allocate a GNUNET_MQ_Envelope.
Definition: gnunet_mq_lib.h:78
#define GNUNET_MESSAGE_TYPE_FS_START_SEARCH
Client asks FS service to start a (keyword) search.
struct GNUNET_PeerIdentity target
Identity of the peer having the content, or all-zeros if we don't know of such a peer.
Definition: fs_api.h:1862
Message sent from a GNUnet (fs) search activity to the gnunet-service-fs to start a search.
Definition: fs.h:270
struct GNUNET_PeerIdentity target
If the request is for a DBLOCK or IBLOCK, this is the identity of the peer that is known to have a re...
Definition: fs.h:307
uint32_t type
Type of the content that we're looking for.
Definition: fs.h:290
struct GNUNET_HashCode query
Hash of the public key for UBLOCKs; Hash of the CHK-encoded block for DBLOCKS and IBLOCKS.
Definition: fs.h:313
uint32_t anonymity_level
Desired anonymity level, big-endian.
Definition: fs.h:295
uint32_t options
Bitmask with options.
Definition: fs.h:285

References GNUNET_FS_DownloadContext::anonymity, SearchMessage::anonymity_level, DownloadRequest::chk, dc, DownloadRequest::depth, env, GNUNET_BLOCK_TYPE_FS_DBLOCK, GNUNET_BLOCK_TYPE_FS_IBLOCK, GNUNET_FS_DOWNLOAD_OPTION_LOOPBACK_ONLY, GNUNET_FS_SEARCH_OPTION_LOOPBACK_ONLY, GNUNET_FS_SEARCH_OPTION_NONE, GNUNET_MESSAGE_TYPE_FS_START_SEARCH, GNUNET_MQ_msg, GNUNET_MQ_send(), GNUNET_OK, GNUNET_FS_DownloadContext::mq, SearchMessage::options, GNUNET_FS_DownloadContext::options, ContentHashKey::query, SearchMessage::query, SearchMessage::target, GNUNET_FS_DownloadContext::target, and SearchMessage::type.

Referenced by do_reconnect(), and schedule_block_download().

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◆ schedule_block_download()

static void schedule_block_download ( struct GNUNET_FS_DownloadContext dc,
struct DownloadRequest dr 
)
static

Schedule the download of the specified block in the tree.

Parameters
dcoverall download this block belongs to
drrequest to schedule

Definition at line 778 of file fs_download.c.

780{
781 unsigned int i;
782
783 switch (dr->state)
784 {
785 case BRS_INIT:
786 GNUNET_assert (0);
787 break;
788
790 GNUNET_assert (0);
791 break;
792
794 GNUNET_assert (0);
795 break;
796
798 GNUNET_assert (0);
799 break;
800
801 case BRS_CHK_SET:
802 /* normal case, start download */
803 break;
804
806 for (i = 0; i < dr->num_children; i++)
808 return;
809
810 case BRS_DOWNLOAD_UP:
811 /* We're done! */
812 return;
813
814 case BRS_ERROR:
815 GNUNET_break (0);
816 return;
817 }
819 "Scheduling download at offset %llu and depth %u for `%s'\n",
820 (unsigned long long) dr->offset,
821 dr->depth,
822 GNUNET_h2s (&dr->chk.query));
824 &dr->chk.query,
825 dr))
826 return; /* already active */
828 &dr->chk.query,
829 dr,
831 if (NULL == dc->mq)
832 return; /* download not active */
833 retry_entry (dc, &dr->chk.query, dr);
834}
static int retry_entry(void *cls, const struct GNUNET_HashCode *key, void *entry)
Add entries to the message queue.
Definition: fs_download.c:747
enum GNUNET_GenericReturnValue GNUNET_CONTAINER_multihashmap_contains_value(const struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key, const void *value)
Check if the map contains the given value under the given key.
enum GNUNET_GenericReturnValue GNUNET_CONTAINER_multihashmap_put(struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
Store a key-value pair in the map.
@ GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE
Allow multiple values with the same key.

References GNUNET_FS_DownloadContext::active, BRS_CHK_SET, BRS_DOWNLOAD_DOWN, BRS_DOWNLOAD_UP, BRS_ERROR, BRS_INIT, BRS_RECONSTRUCT_DOWN, BRS_RECONSTRUCT_META_UP, BRS_RECONSTRUCT_UP, DownloadRequest::children, DownloadRequest::chk, dc, DownloadRequest::depth, GNUNET_assert, GNUNET_break, GNUNET_CONTAINER_multihashmap_contains_value(), GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_NO, GNUNET_FS_DownloadContext::mq, DownloadRequest::num_children, DownloadRequest::offset, ContentHashKey::query, retry_entry(), schedule_block_download(), and DownloadRequest::state.

Referenced by GNUNET_FS_download_start_task_(), process_result_with_request(), reconstruct_cont(), and schedule_block_download().

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◆ GNUNET_FS_free_download_request_()

void GNUNET_FS_free_download_request_ ( struct DownloadRequest dr)

(recursively) free download request structure

Parameters
drrequest to free

Definition at line 997 of file fs_download.c.

998{
999 if (NULL == dr)
1000 return;
1001 for (unsigned int i = 0; i < dr->num_children; i++)
1003 GNUNET_free (dr->children);
1004 GNUNET_free (dr);
1005}

References DownloadRequest::children, GNUNET_free, GNUNET_FS_free_download_request_(), and DownloadRequest::num_children.

Referenced by free_download_context(), GNUNET_FS_download_signal_suspend_(), GNUNET_FS_download_stop(), GNUNET_FS_free_download_request_(), process_result_with_request(), and read_download_request().

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◆ check_put()

static int check_put ( void *  cls,
const struct ClientPutMessage cm 
)
static

Type of a function to call when we check the PUT message from the service.

Parameters
clsclosure
msgmessage received

Definition at line 1291 of file fs_download.c.

1292{
1293 /* any varsize length is OK */
1294 return GNUNET_OK;
1295}

References GNUNET_OK.

◆ handle_put()

static void handle_put ( void *  cls,
const struct ClientPutMessage cm 
)
static

Type of a function to call when we receive a message from the service.

Parameters
clsclosure
msgmessage received

Definition at line 1306 of file fs_download.c.

1307{
1308 struct GNUNET_FS_DownloadContext *dc = cls;
1309 uint16_t msize = ntohs (cm->header.size) - sizeof(*cm);
1310 struct ProcessResultClosure prc;
1311
1312 prc.dc = dc;
1313 prc.data = &cm[1];
1315 prc.size = msize;
1316 prc.type = ntohl (cm->type);
1317 prc.do_store = GNUNET_YES;
1318 prc.respect_offered = ntohl (cm->respect_offered);
1319 prc.num_transmissions = ntohl (cm->num_transmissions);
1320 GNUNET_CRYPTO_hash (prc.data, msize, &prc.query);
1322 "Received result for query `%s' from FS service\n",
1323 GNUNET_h2s (&prc.query));
1325 &prc.query,
1327 &prc);
1328}
enum GNUNET_GenericReturnValue GNUNET_CONTAINER_multihashmap_get_multiple(struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key, GNUNET_CONTAINER_MultiHashMapIteratorCallback it, void *it_cls)
Iterate over all entries in the map that match a particular key.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_ntoh(struct GNUNET_TIME_AbsoluteNBO a)
Convert absolute time from network byte order.
Definition: time.c:737
uint32_t respect_offered
How much respect did we offer (in total) before getting an answer (estimate).
Definition: fs.h:388
uint32_t type
Type of the block (in big endian).
Definition: fs.h:365
struct GNUNET_MessageHeader header
Message type will be GNUNET_MESSAGE_TYPE_FS_PUT.
Definition: fs.h:360
struct GNUNET_TIME_AbsoluteNBO last_transmission
When was the last time we've tried to download this block? (FOREVER if unknown/not relevant)
Definition: fs.h:376
uint32_t num_transmissions
How often did we transmit this query before getting an answer (estimate).
Definition: fs.h:382

References GNUNET_FS_DownloadContext::active, ProcessResultClosure::data, dc, ProcessResultClosure::dc, ProcessResultClosure::do_store, GNUNET_CONTAINER_multihashmap_get_multiple(), GNUNET_CRYPTO_hash(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_TIME_absolute_ntoh(), GNUNET_YES, ClientPutMessage::header, ClientPutMessage::last_transmission, ProcessResultClosure::last_transmission, ClientPutMessage::num_transmissions, ProcessResultClosure::num_transmissions, process_result_with_request(), ProcessResultClosure::query, ClientPutMessage::respect_offered, ProcessResultClosure::respect_offered, GNUNET_MessageHeader::size, ProcessResultClosure::size, ClientPutMessage::type, and ProcessResultClosure::type.

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◆ download_mq_error_handler()

static void download_mq_error_handler ( void *  cls,
enum GNUNET_MQ_Error  error 
)
static

Generic error handler, called with the appropriate error code and the same closure specified at the creation of the message queue.

Not every message queue implementation supports an error handler.

Parameters
clsclosure with the struct GNUNET_FS_DownloadContext *
errorerror code

Definition at line 1340 of file fs_download.c.

1341{
1342 struct GNUNET_FS_DownloadContext *dc = cls;
1343
1344 if (NULL != dc->mq)
1345 {
1347 dc->mq = NULL;
1348 }
1350 "Transmitting download request failed, trying to reconnect\n");
1351 try_reconnect (dc);
1352}
static void try_reconnect(struct GNUNET_FS_DownloadContext *dc)
We've lost our connection with the FS service.
Definition: fs_download.c:1397

References dc, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_MQ_destroy(), GNUNET_FS_DownloadContext::mq, and try_reconnect().

Referenced by do_reconnect().

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◆ do_reconnect()

static void do_reconnect ( void *  cls)
static

Reconnect to the FS service and transmit our queries NOW.

Parameters
clsour download context

Definition at line 1361 of file fs_download.c.

1362{
1363 struct GNUNET_FS_DownloadContext *dc = cls;
1365 { GNUNET_MQ_hd_var_size (put,
1367 struct ClientPutMessage,
1368 dc),
1370
1371 dc->task = NULL;
1373 "fs",
1374 handlers,
1376 dc);
1377 if (NULL == dc->mq)
1378 {
1380 "Connecting to `%s'-service failed, will try again.\n",
1381 "FS");
1382 try_reconnect (dc);
1383 return;
1384 }
1386}
struct GNUNET_MQ_MessageHandlers handlers[]
Definition: 003.c:1
static void download_mq_error_handler(void *cls, enum GNUNET_MQ_Error error)
Generic error handler, called with the appropriate error code and the same closure specified at the c...
Definition: fs_download.c:1340
struct GNUNET_MQ_Handle * GNUNET_CLIENT_connect(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *service_name, const struct GNUNET_MQ_MessageHandler *handlers, GNUNET_MQ_ErrorHandler error_handler, void *error_handler_cls)
Create a message queue to connect to a GNUnet service.
Definition: client.c:1057
int GNUNET_CONTAINER_multihashmap_iterate(struct GNUNET_CONTAINER_MultiHashMap *map, GNUNET_CONTAINER_MultiHashMapIteratorCallback it, void *it_cls)
Iterate over all entries in the map.
#define GNUNET_MQ_handler_end()
End-marker for the handlers array.
#define GNUNET_MQ_hd_var_size(name, code, str, ctx)
#define GNUNET_MESSAGE_TYPE_FS_PUT
P2P response with content or active migration of content.
Response from FS service with a result for a previous FS search.
Definition: fs.h:356
const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration to use.
Definition: fs_api.h:1074
Message handler for a specific message type.

References GNUNET_FS_DownloadContext::active, GNUNET_FS_Handle::cfg, dc, download_mq_error_handler(), GNUNET_CLIENT_connect(), GNUNET_CONTAINER_multihashmap_iterate(), GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_MESSAGE_TYPE_FS_PUT, GNUNET_MQ_handler_end, GNUNET_MQ_hd_var_size, GNUNET_FS_DownloadContext::h, handlers, GNUNET_FS_DownloadContext::mq, retry_entry(), GNUNET_FS_DownloadContext::task, and try_reconnect().

Referenced by activate_fs_download(), and try_reconnect().

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◆ activate_fs_download()

static void activate_fs_download ( void *  cls)
static

We're allowed to ask the FS service for our blocks.

Start the download.

Parameters
clsthe 'struct GNUNET_FS_DownloadContext'

Definition at line 1427 of file fs_download.c.

1428{
1429 struct GNUNET_FS_DownloadContext *dc = cls;
1430 struct GNUNET_FS_ProgressInfo pi;
1431
1432 GNUNET_assert (NULL == dc->mq);
1433 GNUNET_assert (NULL != dc->active);
1434 do_reconnect (dc);
1435 if (NULL != dc->mq)
1436 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Download activated\n");
1439}
@ GNUNET_FS_STATUS_DOWNLOAD_ACTIVE
Notification that this download is now actively being pursued (as opposed to waiting in the queue).

References GNUNET_FS_DownloadContext::active, dc, do_reconnect(), GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_FS_download_make_status_(), GNUNET_FS_STATUS_DOWNLOAD_ACTIVE, GNUNET_log, GNUNET_FS_DownloadContext::mq, and GNUNET_FS_ProgressInfo::status.

Referenced by GNUNET_FS_download_resume(), and GNUNET_FS_download_start_downloading_().

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◆ deactivate_fs_download()

static void deactivate_fs_download ( void *  cls)
static

We must stop to ask the FS service for our blocks.

Pause the download.

Parameters
clsthe struct GNUNET_FS_DownloadContext

Definition at line 1448 of file fs_download.c.

1449{
1450 struct GNUNET_FS_DownloadContext *dc = cls;
1451 struct GNUNET_FS_ProgressInfo pi;
1452
1453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Download deactivated\n");
1454 if (NULL != dc->mq)
1455 {
1457 dc->mq = NULL;
1458 }
1461}
@ GNUNET_FS_STATUS_DOWNLOAD_INACTIVE
Notification that this download is no longer actively being pursued (back in the queue).

References dc, GNUNET_ERROR_TYPE_DEBUG, GNUNET_FS_download_make_status_(), GNUNET_FS_STATUS_DOWNLOAD_INACTIVE, GNUNET_log, GNUNET_MQ_destroy(), GNUNET_FS_DownloadContext::mq, and GNUNET_FS_ProgressInfo::status.

Referenced by GNUNET_FS_download_resume(), GNUNET_FS_download_start_downloading_(), and GNUNET_FS_download_suspend().

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◆ create_download_request()

static struct DownloadRequest * create_download_request ( struct DownloadRequest parent,
unsigned int  chk_idx,
unsigned int  depth,
uint64_t  dr_offset,
uint64_t  file_start_offset,
uint64_t  desired_length 
)
static

(recursively) Create a download request structure.

Parameters
parentparent of the current entry
chk_idxindex of the chk for this block in the parent block
depthdepth of the current entry, 0 are the DBLOCKs, top level block is 'dc->treedepth - 1'
dr_offsetoffset in the original file this block maps to (as in, offset of the first byte of the first DBLOCK in the subtree rooted in the returned download request tree)
file_start_offsetdesired starting offset for the download in the original file; requesting tree should not contain DBLOCKs prior to the file_start_offset
desired_lengthdesired number of bytes the user wanted to access (from file_start_offset). Resulting tree should not contain DBLOCKs after file_start_offset + file_length.
Returns
download request tree for the given range of DBLOCKs at the specified depth

Definition at line 1484 of file fs_download.c.

1490{
1491 struct DownloadRequest *dr;
1492 unsigned int i;
1493 unsigned int head_skip;
1494 uint64_t child_block_size;
1495
1496 dr = GNUNET_new (struct DownloadRequest);
1497 dr->parent = parent;
1498 dr->depth = depth;
1499 dr->offset = dr_offset;
1500 dr->chk_idx = chk_idx;
1501 if (0 == depth)
1502 return dr;
1503 child_block_size = GNUNET_FS_tree_compute_tree_size (depth - 1);
1504
1505 /* calculate how many blocks at this level are not interesting
1506 * from the start (rounded down), either because of the requested
1507 * file offset or because this IBlock is further along */
1508 if (dr_offset < file_start_offset)
1509 {
1510 head_skip = (file_start_offset - dr_offset) / child_block_size;
1511 }
1512 else
1513 {
1514 head_skip = 0;
1515 }
1516
1517 /* calculate index of last block at this level that is interesting (rounded up) */
1518 dr->num_children =
1519 (file_start_offset + desired_length - dr_offset) / child_block_size;
1520 if (dr->num_children * child_block_size <
1521 file_start_offset + desired_length - dr_offset)
1522 dr->num_children++; /* round up */
1523 GNUNET_assert (dr->num_children > head_skip);
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 "Block at offset %llu and depth %u has %u children\n",
1529 (unsigned long long) dr_offset,
1530 depth,
1531 dr->num_children);
1532
1533 /* now we can get the total number of *interesting* children for this block */
1534
1535 /* why else would we have gotten here to begin with? (that'd be a bad logic error) */
1536 GNUNET_assert (dr->num_children > 0);
1537
1539 for (i = 0; i < dr->num_children; i++)
1540 {
1541 dr->children[i] =
1543 i + head_skip,
1544 depth - 1,
1545 dr_offset + (i + head_skip) * child_block_size,
1546 file_start_offset,
1547 desired_length);
1548 }
1549 return dr;
1550}
static struct DownloadRequest * create_download_request(struct DownloadRequest *parent, unsigned int chk_idx, unsigned int depth, uint64_t dr_offset, uint64_t file_start_offset, uint64_t desired_length)
(recursively) Create a download request structure.
Definition: fs_download.c:1484
#define GNUNET_new(type)
Allocate a struct or union of the given type.
#define GNUNET_new_array(n, type)
Allocate a size n array with structs or unions of the given type.

References DownloadRequest::children, DownloadRequest::chk_idx, CHK_PER_INODE, create_download_request(), DownloadRequest::depth, GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_FS_tree_compute_tree_size(), GNUNET_log, GNUNET_new, GNUNET_new_array, DownloadRequest::num_children, DownloadRequest::offset, and DownloadRequest::parent.

Referenced by create_download_request(), and GNUNET_FS_download_start_task_().

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◆ reconstruct_cont()

static void reconstruct_cont ( void *  cls)
static

Continuation after a possible attempt to reconstruct the current IBlock from the existing file.

Parameters
clsthe 'struct ReconstructContext'

Definition at line 1560 of file fs_download.c.

1561{
1562 struct GNUNET_FS_DownloadContext *dc = cls;
1563
1564 /* clean up state from tree encoder */
1565 if (NULL != dc->task)
1566 {
1568 dc->task = NULL;
1569 }
1570 if (NULL != dc->rfh)
1571 {
1573 dc->rfh = NULL;
1574 }
1575 /* start "normal" download */
1577 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Starting normal download\n");
1579}

References dc, GNUNET_break, GNUNET_DISK_file_close(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_OK, GNUNET_SCHEDULER_cancel(), GNUNET_YES, GNUNET_FS_DownloadContext::issue_requests, GNUNET_FS_DownloadContext::rfh, schedule_block_download(), GNUNET_FS_DownloadContext::task, and GNUNET_FS_DownloadContext::top_request.

Referenced by GNUNET_FS_download_start_task_().

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◆ get_next_block()

static void get_next_block ( void *  cls)
static

Task requesting the next block from the tree encoder.

Parameters
clsthe 'struct GNUJNET_FS_DownloadContext' we're processing

Definition at line 1588 of file fs_download.c.

1589{
1590 struct GNUNET_FS_DownloadContext *dc = cls;
1591
1592 dc->task = NULL;
1594}
void GNUNET_FS_tree_encoder_next(struct GNUNET_FS_TreeEncoder *te)
Encrypt the next block of the file (and call proc and progress accordingly; or of course "cont" if we...
Definition: fs_tree.c:320
struct GNUNET_FS_TreeEncoder * te
Tree encoder used for the reconstruction.
Definition: fs_api.h:1839

References dc, GNUNET_FS_tree_encoder_next(), GNUNET_FS_DownloadContext::task, and GNUNET_FS_DownloadContext::te.

Referenced by GNUNET_FS_download_start_task_(), and reconstruct_cb().

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◆ reconstruct_cb()

static void reconstruct_cb ( void *  cls,
const struct ContentHashKey chk,
uint64_t  offset,
unsigned int  depth,
enum GNUNET_BLOCK_Type  type,
const void *  block,
uint16_t  block_size 
)
static

Function called asking for the current (encoded) block to be processed.

After processing the client should either call "GNUNET_FS_tree_encode_next" or (on error) "GNUNET_FS_tree_encode_finish".

This function checks if the content on disk matches the expected content based on the URI.

Parameters
clsclosure
chkcontent hash key for the block
offsetoffset of the block
depthdepth of the block, 0 for DBLOCK
typetype of the block (IBLOCK or DBLOCK)
blockthe (encrypted) block
block_sizesize of block (in bytes)

Definition at line 1615 of file fs_download.c.

1622{
1623 struct GNUNET_FS_DownloadContext *dc = cls;
1624 struct GNUNET_FS_ProgressInfo pi;
1625 struct DownloadRequest *dr;
1626 uint64_t blen;
1627 unsigned int chld;
1628
1629 /* find corresponding request entry */
1630 dr = dc->top_request;
1631 while (dr->depth > depth)
1632 {
1633 GNUNET_assert (dr->num_children > 0);
1634 blen = GNUNET_FS_tree_compute_tree_size (dr->depth - 1);
1635 chld = (offset - dr->offset) / blen;
1636 if (chld < dr->children[0]->chk_idx)
1637 {
1639 "Block %u < %u irrelevant for our range\n",
1640 chld,
1641 dr->children[0]->chk_idx);
1643 return; /* irrelevant block */
1644 }
1645 if (chld > dr->children[dr->num_children - 1]->chk_idx)
1646 {
1648 "Block %u > %u irrelevant for our range\n",
1649 chld,
1650 dr->children[dr->num_children - 1]->chk_idx);
1652 return; /* irrelevant block */
1653 }
1654 dr = dr->children[chld - dr->children[0]->chk_idx];
1655 }
1656 GNUNET_log (
1658 "Matched TE block with request at offset %llu and depth %u in state %d\n",
1659 (unsigned long long) dr->offset,
1660 dr->depth,
1661 dr->state);
1662 /* FIXME: this code needs more testing and might
1663 need to handle more states... */
1664 switch (dr->state)
1665 {
1666 case BRS_INIT:
1667 break;
1668
1670 break;
1671
1673 break;
1674
1675 case BRS_RECONSTRUCT_UP:
1676 break;
1677
1678 case BRS_CHK_SET:
1679 if (0 == memcmp (chk, &dr->chk, sizeof(struct ContentHashKey)))
1680 {
1681 GNUNET_log (
1683 "Reconstruction succeeded, can use block at offset %llu, depth %u\n",
1684 (unsigned long long) offset,
1685 depth);
1686 /* block matches, hence tree below matches;
1687 * this request is done! */
1688 dr->state = BRS_DOWNLOAD_UP;
1690 &dr->chk.query,
1691 dr);
1692 /* calculate how many bytes of payload this block
1693 * corresponds to */
1695 /* how many of those bytes are in the requested range? */
1696 blen = GNUNET_MIN (blen, dc->length + dc->offset - dr->offset);
1697 /* signal progress */
1698 dc->completed += blen;
1700 pi.value.download.specifics.progress.data = NULL;
1701 pi.value.download.specifics.progress.offset = offset;
1702 pi.value.download.specifics.progress.data_len = 0;
1703 pi.value.download.specifics.progress.depth = 0;
1704 pi.value.download.specifics.progress.respect_offered = 0;
1705 pi.value.download.specifics.progress.block_download_duration =
1708 /* FIXME: duplicated code from 'process_result_with_request - refactor */
1709 if (dc->completed == dc->length)
1710 {
1711 /* download completed, signal */
1713 "Download completed, truncating file to desired length %llu\n",
1714 (unsigned long long) GNUNET_ntohll (
1716 /* truncate file to size (since we store IBlocks at the end) */
1717 if (NULL != dc->filename)
1718 {
1719 if (0 != truncate (dc->filename,
1722 "truncate",
1723 dc->filename);
1724 }
1725 }
1726 }
1727 else
1728 GNUNET_log (
1730 "Reconstruction failed, need to download block at offset %llu, depth %u\n",
1731 (unsigned long long) offset,
1732 depth);
1733 break;
1734
1735 case BRS_DOWNLOAD_DOWN:
1736 break;
1737
1738 case BRS_DOWNLOAD_UP:
1739 break;
1740
1741 case BRS_ERROR:
1742 break;
1743
1744 default:
1745 GNUNET_assert (0);
1746 break;
1747 }
1749 if ((dr == dc->top_request) && (dr->state == BRS_DOWNLOAD_UP))
1751}
static void get_next_block(void *cls)
Task requesting the next block from the tree encoder.
Definition: fs_download.c:1588
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1305

References GNUNET_FS_DownloadContext::active, BRS_CHK_SET, BRS_DOWNLOAD_DOWN, BRS_DOWNLOAD_UP, BRS_ERROR, BRS_INIT, BRS_RECONSTRUCT_DOWN, BRS_RECONSTRUCT_META_UP, BRS_RECONSTRUCT_UP, check_completed(), DownloadRequest::children, GNUNET_FS_Uri::chk, DownloadRequest::chk, DownloadRequest::chk_idx, GNUNET_FS_DownloadContext::completed, GNUNET_FS_Uri::data, dc, DownloadRequest::depth, GNUNET_FS_ProgressInfo::download, FileIdentifier::file_length, GNUNET_FS_DownloadContext::filename, get_next_block(), GNUNET_assert, GNUNET_CONTAINER_multihashmap_remove(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_FS_download_make_status_(), GNUNET_FS_STATUS_DOWNLOAD_PROGRESS, GNUNET_FS_tree_compute_tree_size(), GNUNET_log, GNUNET_log_strerror_file, GNUNET_MIN, GNUNET_ntohll(), GNUNET_SCHEDULER_add_now(), GNUNET_TIME_UNIT_ZERO, GNUNET_FS_DownloadContext::length, DownloadRequest::num_children, DownloadRequest::offset, GNUNET_FS_DownloadContext::offset, ContentHashKey::query, DownloadRequest::state, GNUNET_FS_ProgressInfo::status, GNUNET_FS_DownloadContext::task, GNUNET_FS_DownloadContext::top_request, GNUNET_FS_DownloadContext::uri, and GNUNET_FS_ProgressInfo::value.

Referenced by GNUNET_FS_download_start_task_().

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◆ fh_reader()

static size_t fh_reader ( void *  cls,
uint64_t  offset,
size_t  max,
void *  buf,
char **  emsg 
)
static

Function called by the tree encoder to obtain a block of plaintext data (for the lowest level of the tree).

Parameters
clsour 'struct ReconstructContext'
offsetidentifies which block to get
max(maximum) number of bytes to get; returning fewer will also cause errors
bufwhere to copy the plaintext buffer
emsglocation to store an error message (on error)
Returns
number of bytes copied to buf, 0 on error

Definition at line 1767 of file fs_download.c.

1768{
1769 struct GNUNET_FS_DownloadContext *dc = cls;
1770 struct GNUNET_DISK_FileHandle *fh = dc->rfh;
1771 ssize_t ret;
1772
1773 if (NULL != emsg)
1774 *emsg = NULL;
1775 if (offset != GNUNET_DISK_file_seek (fh, offset, GNUNET_DISK_SEEK_SET))
1776 {
1777 if (NULL != emsg)
1778 *emsg = GNUNET_strdup (strerror (errno));
1779 return 0;
1780 }
1781 ret = GNUNET_DISK_file_read (fh, buf, max);
1782 if (ret < 0)
1783 {
1784 if (NULL != emsg)
1785 *emsg = GNUNET_strdup (strerror (errno));
1786 return 0;
1787 }
1788 return ret;
1789}
static int ret
Final status code.
Definition: gnunet-arm.c:94
#define max(x, y)

References dc, GNUNET_DISK_file_read(), GNUNET_DISK_file_seek(), GNUNET_DISK_SEEK_SET, GNUNET_strdup, max, ret, and GNUNET_FS_DownloadContext::rfh.

Referenced by GNUNET_FS_download_start_task_().

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◆ GNUNET_FS_download_start_task_()

void GNUNET_FS_download_start_task_ ( void *  cls)

Task that creates the initial (top-level) download request for the file.

Parameters
clsthe 'struct GNUNET_FS_DownloadContext'

Definition at line 1799 of file fs_download.c.

1800{
1801 struct GNUNET_FS_DownloadContext *dc = cls;
1802 struct GNUNET_FS_ProgressInfo pi;
1803 struct GNUNET_DISK_FileHandle *fh;
1804
1805 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Start task running...\n");
1806 dc->task = NULL;
1807 if (0 == dc->length)
1808 {
1809 /* no bytes required! */
1810 if (NULL != dc->filename)
1811 {
1815 | ((0 ==
1818 : 0),
1824 }
1827 pi.value.download.specifics.start.meta = dc->meta;
1830 return;
1831 }
1832 if (NULL != dc->emsg)
1833 return;
1834 if (NULL == dc->top_request)
1835 {
1837 0,
1838 dc->treedepth - 1,
1839 0,
1840 dc->offset,
1841 dc->length);
1844 ? dc->uri->data.chk.chk
1845 : dc->uri->data.loc.fi.chk;
1846 /* signal start */
1848 if (NULL != dc->search)
1851 pi.value.download.specifics.start.meta = dc->meta;
1853 }
1855 /* attempt reconstruction from disk */
1861 {
1862 if (NULL != dc->rfh)
1863 {
1864 /* first, try top-down */
1866 "Trying top-down reconstruction for `%s'\n",
1867 dc->filename);
1869 switch (dc->top_request->state)
1870 {
1871 case BRS_CHK_SET:
1872 break; /* normal */
1873
1874 case BRS_DOWNLOAD_DOWN:
1875 break; /* normal, some blocks already down */
1876
1877 case BRS_DOWNLOAD_UP:
1878 /* already done entirely, party! */
1879 if (NULL != dc->rfh)
1880 {
1881 /* avoid hanging on to file handle longer than
1882 * necessary */
1884 dc->rfh = NULL;
1885 }
1886 return;
1887
1888 case BRS_ERROR:
1889 GNUNET_asprintf (&dc->emsg, _ ("Invalid URI"));
1892 pi.value.download.specifics.error.message = dc->emsg;
1894 return;
1895
1896 default:
1897 GNUNET_assert (0);
1898 break;
1899 }
1900 }
1901 }
1902 /* attempt reconstruction from meta data */
1904 (NULL != dc->meta))
1905 {
1906 GNUNET_log (
1908 "Trying to find embedded meta data for download of size %llu with %u bytes MD\n",
1909 (unsigned long long) GNUNET_FS_uri_chk_get_file_size (dc->uri),
1913 {
1914 if (NULL != dc->rfh)
1915 {
1916 /* avoid hanging on to file handle longer than
1917 * necessary */
1919 dc->rfh = NULL;
1920 }
1921 return; /* finished, status update was already done for us */
1922 }
1923 }
1924 if (NULL != dc->rfh)
1925 {
1926 /* finally, actually run bottom-up */
1928 "Trying bottom-up reconstruction of file `%s'\n",
1929 dc->filename);
1930 dc->te =
1933 dc,
1934 &fh_reader,
1936 NULL,
1939 }
1940 else
1941 {
1942 /* simple, top-level download */
1945 }
1948}
void GNUNET_FS_search_result_sync_(struct GNUNET_FS_SearchResult *sr)
Synchronize this search result with its mirror on disk.
Definition: fs_api.c:2149
#define MAX_INLINE_SIZE
Maximum size for a file to be considered for inlining in a directory.
Definition: fs_api.h:50
@ GNUNET_FS_URI_CHK
Content-hash-key (simple file).
Definition: fs_api.h:144
static void reconstruct_cb(void *cls, const struct ContentHashKey *chk, uint64_t offset, unsigned int depth, enum GNUNET_BLOCK_Type type, const void *block, uint16_t block_size)
Function called asking for the current (encoded) block to be processed.
Definition: fs_download.c:1615
static size_t fh_reader(void *cls, uint64_t offset, size_t max, void *buf, char **emsg)
Function called by the tree encoder to obtain a block of plaintext data (for the lowest level of the ...
Definition: fs_download.c:1767
static int match_full_data(void *cls, const char *plugin_name, enum EXTRACTOR_MetaType type, enum EXTRACTOR_MetaFormat format, const char *data_mime_type, const char *data, size_t data_len)
Type of a function that libextractor calls for each meta data item found.
Definition: fs_download.c:602
static void reconstruct_cont(void *cls)
Continuation after a possible attempt to reconstruct the current IBlock from the existing file.
Definition: fs_download.c:1560
void GNUNET_FS_download_start_downloading_(struct GNUNET_FS_DownloadContext *dc)
Start the downloading process (by entering the queue).
Definition: fs_download.c:2183
struct GNUNET_FS_TreeEncoder * GNUNET_FS_tree_encoder_create(struct GNUNET_FS_Handle *h, uint64_t size, void *cls, GNUNET_FS_DataReader reader, GNUNET_FS_TreeBlockProcessor proc, GNUNET_FS_TreeProgressCallback progress, GNUNET_SCHEDULER_TaskCallback cont)
Initialize a tree encoder.
Definition: fs_tree.c:258
enum GNUNET_GenericReturnValue GNUNET_DISK_file_test(const char *fil)
Check that fil corresponds to a filename (of a file that exists and that is not a directory).
Definition: disk.c:482
@ GNUNET_FS_STATUS_DOWNLOAD_START
Notification that we have started this download.
int GNUNET_FS_meta_data_iterate(const struct GNUNET_FS_MetaData *md, EXTRACTOR_MetaDataProcessor iter, void *iter_cls)
Iterate over MD entries.
Definition: meta_data.c:418
struct ContentHashKey chk
Query and key of the top GNUNET_EC_IBlock.
Definition: fs_api.h:104
enum GNUNET_FS_UriType type
Type of the URI.
Definition: fs_api.h:171
struct Location loc
Information needed to retrieve a file including signed location (identity of a peer) of the content.
Definition: fs_api.h:218
struct FileIdentifier fi
Information about the shared file.
Definition: fs_api.h:117

References _, BRS_CHK_SET, BRS_DOWNLOAD_DOWN, BRS_DOWNLOAD_UP, BRS_ERROR, check_completed(), FileIdentifier::chk, GNUNET_FS_Uri::chk, DownloadRequest::chk, create_download_request(), GNUNET_FS_Uri::data, dc, GNUNET_FS_ProgressInfo::download, GNUNET_FS_DownloadContext::emsg, fh_reader(), Location::fi, GNUNET_FS_DownloadContext::filename, get_next_block(), GNUNET_asprintf(), GNUNET_assert, GNUNET_DISK_file_close(), GNUNET_DISK_file_open(), GNUNET_DISK_file_test(), GNUNET_DISK_OPEN_CREATE, GNUNET_DISK_OPEN_READ, GNUNET_DISK_OPEN_READWRITE, GNUNET_DISK_OPEN_TRUNCATE, GNUNET_DISK_PERM_GROUP_READ, GNUNET_DISK_PERM_NONE, GNUNET_DISK_PERM_OTHER_READ, GNUNET_DISK_PERM_USER_READ, GNUNET_DISK_PERM_USER_WRITE, GNUNET_ERROR_TYPE_DEBUG, GNUNET_FS_download_make_status_(), GNUNET_FS_download_start_downloading_(), GNUNET_FS_download_sync_(), GNUNET_FS_meta_data_get_serialized_size(), GNUNET_FS_meta_data_iterate(), GNUNET_FS_search_result_sync_(), GNUNET_FS_STATUS_DOWNLOAD_ERROR, GNUNET_FS_STATUS_DOWNLOAD_START, GNUNET_FS_tree_encoder_create(), GNUNET_FS_URI_CHK, GNUNET_FS_uri_chk_get_file_size(), GNUNET_log, GNUNET_SCHEDULER_add_now(), GNUNET_YES, GNUNET_FS_DownloadContext::h, GNUNET_FS_DownloadContext::issue_requests, GNUNET_FS_DownloadContext::length, GNUNET_FS_Uri::loc, match_full_data(), MAX_INLINE_SIZE, GNUNET_FS_DownloadContext::meta, GNUNET_FS_DownloadContext::offset, reconstruct_cb(), reconstruct_cont(), GNUNET_FS_DownloadContext::rfh, schedule_block_download(), GNUNET_FS_DownloadContext::search, DownloadRequest::state, GNUNET_FS_ProgressInfo::status, GNUNET_FS_DownloadContext::task, GNUNET_FS_DownloadContext::te, GNUNET_FS_DownloadContext::top_request, GNUNET_FS_DownloadContext::treedepth, try_top_down_reconstruction(), GNUNET_FS_Uri::type, GNUNET_FS_DownloadContext::uri, and GNUNET_FS_ProgressInfo::value.

Referenced by create_download_context(), and deserialize_download().

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◆ GNUNET_FS_download_signal_suspend_()

void GNUNET_FS_download_signal_suspend_ ( void *  cls)

Create SUSPEND event for the given download operation and then clean up our state (without stop signal).

Parameters
clsthe struct GNUNET_FS_DownloadContext to signal for

Definition at line 1952 of file fs_download.c.

1953{
1954 struct GNUNET_FS_DownloadContext *dc = cls;
1955 struct GNUNET_FS_ProgressInfo pi;
1956
1957 if (NULL != dc->top)
1959 while (NULL != dc->child_head)
1961 if (NULL != dc->search)
1962 {
1963 dc->search->download = NULL;
1964 dc->search = NULL;
1965 }
1966 if (NULL != dc->job_queue)
1967 {
1969 dc->job_queue = NULL;
1970 }
1971 if (NULL != dc->parent)
1974 dc);
1975 if (NULL != dc->task)
1976 {
1978 dc->task = NULL;
1979 }
1982 if (NULL != dc->te)
1983 {
1985 dc->te = NULL;
1986 }
1987 if (NULL != dc->rfh)
1988 {
1990 dc->rfh = NULL;
1991 }
1993 if (NULL != dc->active)
1994 {
1996 dc->active = NULL;
1997 }
2003 GNUNET_assert (NULL == dc->job_queue);
2004 GNUNET_free (dc);
2005}
void GNUNET_FS_end_top(struct GNUNET_FS_Handle *h, struct TopLevelActivity *top)
Destroy a top-level activity entry.
Definition: fs_api.c:402
void GNUNET_FS_download_signal_suspend_(void *cls)
Create SUSPEND event for the given download operation and then clean up our state (without stop signa...
Definition: fs_download.c:1952
void GNUNET_FS_tree_encoder_finish(struct GNUNET_FS_TreeEncoder *te, char **emsg)
Clean up a tree encoder and return information about possible errors.
Definition: fs_tree.c:432
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
void GNUNET_FS_uri_destroy(struct GNUNET_FS_Uri *uri)
Free URI.
Definition: fs_uri.c:677
@ GNUNET_FS_STATUS_DOWNLOAD_SUSPEND
Notification that this download was suspended.
void GNUNET_CONTAINER_multihashmap_destroy(struct GNUNET_CONTAINER_MultiHashMap *map)
Destroy a hash map.
void GNUNET_FS_meta_data_destroy(struct GNUNET_FS_MetaData *md)
Free meta data.
Definition: meta_data.c:166
struct GNUNET_FS_DownloadContext * child_tail
Tail of list of child downloads.
Definition: fs_api.h:1780
char * serialization
Random portion of filename we use for syncing state of this download.
Definition: fs_api.h:1816
struct TopLevelActivity * top
Our top-level activity entry (if we are top-level, otherwise NULL).
Definition: fs_api.h:1753
struct GNUNET_FS_DownloadContext * download
ID of an associated download based on this search result (or NULL for none).
Definition: fs_api.h:546

References GNUNET_FS_DownloadContext::active, GNUNET_FS_DownloadContext::child_head, GNUNET_FS_DownloadContext::child_tail, dc, GNUNET_FS_SearchResult::download, GNUNET_FS_DownloadContext::filename, GNUNET_assert, GNUNET_CONTAINER_DLL_remove, GNUNET_CONTAINER_multihashmap_destroy(), GNUNET_DISK_file_close(), GNUNET_free, GNUNET_FS_dequeue_(), GNUNET_FS_download_make_status_(), GNUNET_FS_download_signal_suspend_(), GNUNET_FS_end_top(), GNUNET_FS_free_download_request_(), GNUNET_FS_meta_data_destroy(), GNUNET_FS_STATUS_DOWNLOAD_SUSPEND, GNUNET_FS_tree_encoder_finish(), GNUNET_FS_uri_destroy(), GNUNET_SCHEDULER_cancel(), GNUNET_FS_DownloadContext::h, GNUNET_FS_DownloadContext::job_queue, GNUNET_FS_DownloadContext::meta, GNUNET_FS_DownloadContext::parent, GNUNET_FS_DownloadContext::rfh, GNUNET_FS_DownloadContext::search, GNUNET_FS_DownloadContext::serialization, GNUNET_FS_ProgressInfo::status, GNUNET_FS_DownloadContext::task, GNUNET_FS_DownloadContext::te, GNUNET_FS_DownloadContext::temp_filename, GNUNET_FS_DownloadContext::top, GNUNET_FS_DownloadContext::top_request, and GNUNET_FS_DownloadContext::uri.

Referenced by deserialize_download(), GNUNET_FS_download_signal_suspend_(), GNUNET_FS_download_start(), search_result_stop(), and search_result_suspend().

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◆ create_download_context()

struct GNUNET_FS_DownloadContext * create_download_context ( struct GNUNET_FS_Handle h,
const struct GNUNET_FS_Uri uri,
const struct GNUNET_FS_MetaData meta,
const char *  filename,
const char *  tempname,
uint64_t  offset,
uint64_t  length,
uint32_t  anonymity,
enum GNUNET_FS_DownloadOptions  options,
void *  cctx 
)

Helper function to setup the download context.

Parameters
hhandle to the file sharing subsystem
urithe URI of the file (determines what to download); CHK or LOC URI
metaknown metadata for the file (can be NULL)
filenamewhere to store the file, maybe NULL (then no file is created on disk and data must be grabbed from the callbacks)
tempnamewhere to store temporary file data, not used if filename is non-NULL; can be NULL (in which case we will pick a name if needed); the temporary file may already exist, in which case we will try to use the data that is there and if it is not what is desired, will overwrite it
offsetat what offset should we start the download (typically 0)
lengthhow many bytes should be downloaded starting at offset
anonymityanonymity level to use for the download
optionsvarious options
cctxinitial value for the client context for this download
Returns
context that can be used to control this download

Definition at line 2028 of file fs_download.c.

2038{
2040
2042 if ((offset + length < offset) ||
2044 {
2045 GNUNET_break (0);
2046 return NULL;
2047 }
2050 "Starting download %p, %u bytes at offset %llu\n",
2051 dc,
2052 (unsigned int) length,
2053 (unsigned long long) offset);
2054 dc->h = h;
2057 dc->client_info = cctx;
2059 if (NULL != filename)
2060 {
2064 &dc->old_file_size,
2065 GNUNET_YES,
2066 GNUNET_YES));
2067 }
2071 dc->offset = offset;
2072 dc->length = length;
2074 dc->options = options;
2075 dc->active =
2077 GNUNET_NO);
2078 dc->treedepth =
2080 if ((NULL == filename) && (is_recursive_download (dc)))
2081 {
2082 if (NULL != tempname)
2083 dc->temp_filename = GNUNET_strdup (tempname);
2084 else
2085 dc->temp_filename = GNUNET_DISK_mktemp ("gnunet-directory-download-tmp");
2086 }
2088 "Starting download `%s' of %llu bytes with tree depth %u\n",
2089 filename,
2090 (unsigned long long) length,
2091 dc->treedepth);
2092 GNUNET_assert (NULL == dc->job_queue);
2094 return dc;
2095}
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
void GNUNET_FS_download_start_task_(void *cls)
Task that creates the initial (top-level) download request for the file.
Definition: fs_download.c:1799
unsigned int GNUNET_FS_compute_depth(uint64_t flen)
Compute the depth of the CHK tree.
Definition: fs_tree.c:125
static unsigned int anonymity
char * GNUNET_DISK_mktemp(const char *t)
Create an (empty) temporary file on disk.
Definition: disk.c:380
enum GNUNET_GenericReturnValue GNUNET_DISK_file_size(const char *filename, uint64_t *size, int include_symbolic_links, int single_file_mode)
Get the size of the file (or directory) of the given file (in bytes).
Definition: disk.c:221
struct GNUNET_FS_Uri * GNUNET_FS_uri_dup(const struct GNUNET_FS_Uri *uri)
Duplicate URI.
Definition: fs_uri.c:987
int GNUNET_FS_uri_test_loc(const struct GNUNET_FS_Uri *uri)
Is this a location URI?
Definition: fs_uri.c:1401
int GNUNET_FS_uri_test_chk(const struct GNUNET_FS_Uri *uri)
Is this a file (or directory) URI?
Definition: fs_uri.c:1346
int GNUNET_FS_uri_loc_get_peer_identity(const struct GNUNET_FS_Uri *uri, struct GNUNET_PeerIdentity *peer)
Obtain the identity of the peer offering the data.
Definition: fs_uri.c:812
struct GNUNET_CONTAINER_MultiHashMap * GNUNET_CONTAINER_multihashmap_create(unsigned int len, int do_not_copy_keys)
Create a multi hash map.
struct GNUNET_FS_MetaData * GNUNET_FS_meta_data_duplicate(const struct GNUNET_FS_MetaData *md)
Duplicate a MetaData token.
Definition: meta_data.c:527
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get(void)
Get the current time.
Definition: time.c:111

References GNUNET_FS_DownloadContext::active, anonymity, GNUNET_FS_DownloadContext::anonymity, GNUNET_FS_DownloadContext::client_info, DBLOCK_SIZE, dc, filename, GNUNET_FS_DownloadContext::filename, GNUNET_assert, GNUNET_break, GNUNET_CONTAINER_multihashmap_create(), GNUNET_DISK_file_size(), GNUNET_DISK_file_test(), GNUNET_DISK_mktemp(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_FS_compute_depth(), GNUNET_FS_download_start_task_(), GNUNET_FS_meta_data_duplicate(), GNUNET_FS_uri_chk_get_file_size(), GNUNET_FS_uri_dup(), GNUNET_FS_uri_loc_get_peer_identity(), GNUNET_FS_uri_test_chk(), GNUNET_FS_uri_test_loc(), GNUNET_log, GNUNET_new, GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_strdup, GNUNET_TIME_absolute_get(), GNUNET_YES, h, GNUNET_FS_DownloadContext::h, is_recursive_download(), GNUNET_FS_DownloadContext::job_queue, GNUNET_FS_DownloadContext::length, meta, GNUNET_FS_DownloadContext::meta, GNUNET_FS_DownloadContext::offset, GNUNET_FS_DownloadContext::old_file_size, options, GNUNET_FS_DownloadContext::options, GNUNET_FS_DownloadContext::start_time, GNUNET_FS_DownloadContext::target, GNUNET_FS_DownloadContext::task, GNUNET_FS_DownloadContext::temp_filename, GNUNET_FS_DownloadContext::treedepth, uri, and GNUNET_FS_DownloadContext::uri.

Referenced by GNUNET_FS_download_start(), and GNUNET_FS_download_start_from_search().

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◆ GNUNET_FS_download_start_downloading_()

void GNUNET_FS_download_start_downloading_ ( struct GNUNET_FS_DownloadContext dc)

Start the downloading process (by entering the queue).

Parameters
dcour download context

Definition at line 2183 of file fs_download.c.

2184{
2185 if (dc->completed == dc->length)
2186 return;
2187 if (NULL != dc->mq)
2188 return; /* already running */
2189 GNUNET_assert (NULL == dc->job_queue);
2190 GNUNET_assert (NULL == dc->task);
2191 GNUNET_assert (NULL != dc->active);
2192 dc->job_queue =
2196 dc,
2197 (dc->length + DBLOCK_SIZE - 1) / DBLOCK_SIZE,
2202 "Download %p put into queue as job %p\n",
2203 dc,
2204 dc->job_queue);
2205}
struct GNUNET_FS_QueueEntry * GNUNET_FS_queue_(struct GNUNET_FS_Handle *h, GNUNET_SCHEDULER_TaskCallback start, GNUNET_SCHEDULER_TaskCallback stop, void *cls, unsigned int blocks, enum GNUNET_FS_QueuePriority priority)
Add a job to the queue.
Definition: fs_api.c:321
@ GNUNET_FS_QUEUE_PRIORITY_NORMAL
Default priority.
Definition: fs_api.h:413
@ GNUNET_FS_QUEUE_PRIORITY_PROBE
This is a probe (low priority).
Definition: fs_api.h:408
static void activate_fs_download(void *cls)
We're allowed to ask the FS service for our blocks.
Definition: fs_download.c:1427
static void deactivate_fs_download(void *cls)
We must stop to ask the FS service for our blocks.
Definition: fs_download.c:1448

References activate_fs_download(), GNUNET_FS_DownloadContext::active, GNUNET_FS_DownloadContext::completed, DBLOCK_SIZE, dc, deactivate_fs_download(), GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_FS_DOWNLOAD_IS_PROBE, GNUNET_FS_queue_(), GNUNET_FS_QUEUE_PRIORITY_NORMAL, GNUNET_FS_QUEUE_PRIORITY_PROBE, GNUNET_log, GNUNET_FS_DownloadContext::h, GNUNET_FS_DownloadContext::job_queue, GNUNET_FS_DownloadContext::length, GNUNET_FS_DownloadContext::mq, GNUNET_FS_DownloadContext::options, and GNUNET_FS_DownloadContext::task.

Referenced by GNUNET_FS_download_start_task_().

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