src/fs/fs_publish.c

   1 /*
   2      This file is part of GNUnet.
   3      (C) 2009, 2010 Christian Grothoff (and other contributing authors)
   4
   5      GNUnet is free software; you can redistribute it and/or modify
   6      it under the terms of the GNU General Public License as published
   7      by the Free Software Foundation; either version 2, or (at your
   8      option) any later version.
   9
  10      GNUnet is distributed in the hope that it will be useful, but
  11      WITHOUT ANY WARRANTY; without even the implied warranty of
  12      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13      General Public License for more details.
  14
  15      You should have received a copy of the GNU General Public License
  16      along with GNUnet; see the file COPYING.  If not, write to the
  17      Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18      Boston, MA 02111-1307, USA.
  19 */
  20
  21 /**
  22  * @file fs/fs_publish.c
  23  * @brief publish a file or directory in GNUnet
  24  * @see http://gnunet.org/encoding.php3
  25  * @author Krista Bennett
  26  * @author Christian Grothoff
  27  *
  28  * TODO:
  29  * - indexing cleanup: unindex on failure (can wait)
  30  * - persistence support (can wait)
  31  * - datastore reservation support (optimization)
  32  * - location URIs (publish with anonymity-level zero)
  33  */
  34
  35 #include "platform.h"
  36 #include "gnunet_constants.h"
  37 #include "gnunet_signatures.h"
  38 #include "gnunet_util_lib.h"
  39 #include "gnunet_fs_service.h"
  40 #include "fs.h"
  41 #include "fs_tree.h"
  42
  43 #define DEBUG_PUBLISH GNUNET_NO
  44
  45
  46 /**
  47  * Context for "ds_put_cont".
  48  */
  49 struct PutContCtx
  50 {
  51   /**
  52    * Current publishing context.
  53    */
  54   struct GNUNET_FS_PublishContext *sc;
  55
  56   /**
  57    * Specific file with the block.
  58    */
  59   struct GNUNET_FS_FileInformation *p;
  60
  61   /**
  62    * Function to run next, if any (can be NULL).
  63    */
  64   GNUNET_SCHEDULER_Task cont;
  65
  66   /**
  67    * Closure for cont.
  68    */
  69   void *cont_cls;
  70 };
  71
  72
  73 /**
  74  * Fill in all of the generic fields for
  75  * a publish event and call the callback.
  76  *
  77  * @param pi structure to fill in
  78  * @param sc overall publishing context
  79  * @param p file information for the file being published
  80  * @param offset where in the file are we so far
  81  * @return value returned from callback
  82  */
  83 void *
  84 GNUNET_FS_publish_make_status_ (struct GNUNET_FS_ProgressInfo *pi,
  85                                 struct GNUNET_FS_PublishContext *sc,
  86                                 const struct GNUNET_FS_FileInformation *p,
  87                                 uint64_t offset)
  88 {
  89   pi->value.publish.sc = sc;
  90   pi->value.publish.fi = p;
  91   pi->value.publish.cctx
  92     = p->client_info;
  93   pi->value.publish.pctx
  94     = (NULL == p->dir) ? NULL : p->dir->client_info;
  95   pi->value.publish.filename = p->filename;
  96   pi->value.publish.size
  97     = (p->is_directory) ? p->data.dir.dir_size : p->data.file.file_size;
  98   pi->value.publish.eta
  99     = GNUNET_TIME_calculate_eta (p->start_time,
 100                                  offset,
 101                                  pi->value.publish.size);
 102   pi->value.publish.completed = offset;
 103   pi->value.publish.duration = GNUNET_TIME_absolute_get_duration (p->start_time);
 104   pi->value.publish.anonymity = p->anonymity;
 105   return sc->h->upcb (sc->h->upcb_cls,
 106                       pi);
 107 }
 108
 109
 110 /**
 111  * Cleanup the publish context, we're done with it.
 112  *
 113  * @param pc struct to clean up after
 114  */
 115 static void
 116 publish_cleanup (struct GNUNET_FS_PublishContext *pc)
 117 {
 118   GNUNET_FS_file_information_destroy (pc->fi, NULL, NULL);
 119   if (pc->namespace != NULL)
 120     GNUNET_FS_namespace_delete (pc->namespace, GNUNET_NO);
 121   GNUNET_free_non_null (pc->nid);
 122   GNUNET_free_non_null (pc->nuid);
 123   GNUNET_free_non_null (pc->serialization);
 124   GNUNET_DATASTORE_disconnect (pc->dsh, GNUNET_NO);
 125   if (pc->client != NULL)
 126     GNUNET_CLIENT_disconnect (pc->client, GNUNET_NO);
 127   GNUNET_free (pc);
 128 }
 129
 130
 131 /**
 132  * Function called by the datastore API with
 133  * the result from the PUT request.
 134  *
 135  * @param cls our closure
 136  * @param success GNUNET_OK on success
 137  * @param msg error message (or NULL)
 138  */
 139 static void
 140 ds_put_cont (void *cls,
 141              int success,
 142              const char *msg)
 143 {
 144   struct PutContCtx *pcc = cls;
 145   struct GNUNET_FS_ProgressInfo pi;
 146
 147   if (GNUNET_SYSERR == pcc->sc->in_network_wait)
 148     {
 149       /* we were aborted in the meantime,
 150          finish shutdown! */
 151       publish_cleanup (pcc->sc);
 152       return;
 153     }
 154   GNUNET_assert (GNUNET_YES == pcc->sc->in_network_wait);
 155   pcc->sc->in_network_wait = GNUNET_NO;
 156   if (GNUNET_OK != success)
 157     {
 158       GNUNET_asprintf (&pcc->p->emsg,
 159                        _("Upload failed: %s"),
 160                        msg);
 161       pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
 162       pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
 163       pi.value.publish.specifics.error.message = pcc->p->emsg;
 164       pcc->p->client_info = GNUNET_FS_publish_make_status_ (&pi, pcc->sc, pcc->p, 0);
 165     }
 166   if (NULL != pcc->cont)
 167     pcc->sc->upload_task
 168       = GNUNET_SCHEDULER_add_with_priority (pcc->sc->h->sched,
 169                                             GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 170                                             pcc->cont,
 171                                             pcc->cont_cls);
 172   GNUNET_free (pcc);
 173 }
 174
 175
 176 /**
 177  * Generate the callback that signals clients
 178  * that a file (or directory) has been completely
 179  * published.
 180  *
 181  * @param p the completed upload
 182  * @param sc context of the publication
 183  */
 184 static void
 185 signal_publish_completion (struct GNUNET_FS_FileInformation *p,
 186                            struct GNUNET_FS_PublishContext *sc)
 187 {
 188   struct GNUNET_FS_ProgressInfo pi;
 189
 190   pi.status = GNUNET_FS_STATUS_PUBLISH_COMPLETED;
 191   pi.value.publish.eta = GNUNET_TIME_UNIT_ZERO;
 192   pi.value.publish.specifics.completed.chk_uri = p->chk_uri;
 193   p->client_info = GNUNET_FS_publish_make_status_ (&pi, sc, p,
 194                                         GNUNET_ntohll (p->chk_uri->data.chk.file_length));
 195 }
 196
 197
 198 /**
 199  * Generate the callback that signals clients
 200  * that a file (or directory) has encountered
 201  * a problem during publication.
 202  *
 203  * @param p the upload that had trouble
 204  * @param sc context of the publication
 205  * @param emsg error message
 206  */
 207 static void
 208 signal_publish_error (struct GNUNET_FS_FileInformation *p,
 209                       struct GNUNET_FS_PublishContext *sc,
 210                       const char *emsg)
 211 {
 212   struct GNUNET_FS_ProgressInfo pi;
 213
 214   p->emsg = GNUNET_strdup (emsg);
 215   pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
 216   pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
 217   pi.value.publish.specifics.error.message =emsg;
 218   p->client_info = GNUNET_FS_publish_make_status_ (&pi, sc, p, 0);
 219 }
 220
 221
 222 /**
 223  * We've finished publishing the SBlock as part of a larger upload.
 224  * Check the result and complete the larger upload.
 225  *
 226  * @param cls the "struct GNUNET_FS_PublishContext*" of the larger upload
 227  * @param uri URI of the published SBlock
 228  * @param emsg NULL on success, otherwise error message
 229  */
 230 static void
 231 publish_sblocks_cont (void *cls,
 232                       const struct GNUNET_FS_Uri *uri,
 233                       const char *emsg)
 234 {
 235   struct GNUNET_FS_PublishContext *sc = cls;
 236   if (NULL != emsg)
 237     {
 238       signal_publish_error (sc->fi,
 239                             sc,
 240                             emsg);
 241       return;
 242     }
 243   // FIXME: release the datastore reserve here!
 244   signal_publish_completion (sc->fi, sc);
 245   sc->all_done = GNUNET_YES;
 246 }
 247
 248
 249 /**
 250  * We are almost done publishing the structure,
 251  * add SBlocks (if needed).
 252  *
 253  * @param sc overall upload data
 254  */
 255 static void
 256 publish_sblock (struct GNUNET_FS_PublishContext *sc)
 257 {
 258   if (NULL != sc->namespace)
 259     GNUNET_FS_publish_sks (sc->h,
 260                            sc->namespace,
 261                            sc->nid,
 262                            sc->nuid,
 263                            sc->fi->meta,
 264                            sc->fi->chk_uri,
 265                            sc->fi->expirationTime,
 266                            sc->fi->anonymity,
 267                            sc->fi->priority,
 268                            sc->options,
 269                            &publish_sblocks_cont,
 270                            sc);
 271   else
 272     publish_sblocks_cont (sc, NULL, NULL);
 273 }
 274
 275
 276 /**
 277  * We've finished publishing a KBlock as part of a larger upload.
 278  * Check the result and continue the larger upload.
 279  *
 280  * @param cls the "struct GNUNET_FS_PublishContext*"
 281  *        of the larger upload
 282  * @param uri URI of the published blocks
 283  * @param emsg NULL on success, otherwise error message
 284  */
 285 static void
 286 publish_kblocks_cont (void *cls,
 287                       const struct GNUNET_FS_Uri *uri,
 288                       const char *emsg)
 289 {
 290   struct GNUNET_FS_PublishContext *sc = cls;
 291   struct GNUNET_FS_FileInformation *p = sc->fi_pos;
 292
 293   if (NULL != emsg)
 294     {
 295       signal_publish_error (p, sc, emsg);
 296       sc->upload_task
 297         = GNUNET_SCHEDULER_add_with_priority (sc->h->sched,
 298                                               GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 299                                               &GNUNET_FS_publish_main_,
 300                                               sc);
 301       return;
 302     }
 303   if (NULL != p->dir)
 304     signal_publish_completion (p, sc);
 305   /* move on to next file */
 306   if (NULL != p->next)
 307     sc->fi_pos = p->next;
 308   else
 309     sc->fi_pos = p->dir;
 310   sc->upload_task
 311     = GNUNET_SCHEDULER_add_with_priority (sc->h->sched,
 312                                           GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 313                                           &GNUNET_FS_publish_main_,
 314                                           sc);
 315 }
 316
 317
 318 /**
 319  * Function called by the tree encoder to obtain
 320  * a block of plaintext data (for the lowest level
 321  * of the tree).
 322  *
 323  * @param cls our publishing context
 324  * @param offset identifies which block to get
 325  * @param max (maximum) number of bytes to get; returning
 326  *        fewer will also cause errors
 327  * @param buf where to copy the plaintext buffer
 328  * @param emsg location to store an error message (on error)
 329  * @return number of bytes copied to buf, 0 on error
 330  */
 331 static size_t
 332 block_reader (void *cls,
 333               uint64_t offset,
 334               size_t max,
 335               void *buf,
 336               char **emsg)
 337 {
 338   struct GNUNET_FS_PublishContext *sc = cls;
 339   struct GNUNET_FS_FileInformation *p;
 340   size_t pt_size;
 341   const char *dd;
 342
 343   p = sc->fi_pos;
 344   if (p->is_directory)
 345     {
 346       pt_size = GNUNET_MIN(max,
 347                            p->data.dir.dir_size - offset);
 348       dd = p->data.dir.dir_data;
 349       memcpy (buf,
 350               &dd[offset],
 351               pt_size);
 352     }
 353   else
 354     {
 355       pt_size = GNUNET_MIN(max,
 356                            p->data.file.file_size - offset);
 357       if (pt_size == 0)
 358         return 0; /* calling reader with pt_size==0
 359                      might free buf, so don't! */
 360       if (pt_size !=
 361           p->data.file.reader (p->data.file.reader_cls,
 362                                offset,
 363                                pt_size,
 364                                buf,
 365                                emsg))
 366         return 0;
 367     }
 368   return pt_size;
 369 }
 370
 371
 372 /**
 373  * The tree encoder has finished processing a
 374  * file.   Call it's finish method and deal with
 375  * the final result.
 376  *
 377  * @param cls our publishing context
 378  * @param tc scheduler's task context (not used)
 379  */
 380 static void
 381 encode_cont (void *cls,
 382              const struct GNUNET_SCHEDULER_TaskContext *tc)
 383 {
 384   struct GNUNET_FS_PublishContext *sc = cls;
 385   struct GNUNET_FS_FileInformation *p;
 386   struct GNUNET_FS_ProgressInfo pi;
 387   char *emsg;
 388
 389   p = sc->fi_pos;
 390   GNUNET_FS_tree_encoder_finish (p->te,
 391                                  &p->chk_uri,
 392                                  &emsg);
 393   p->te = NULL;
 394   if (NULL != emsg)
 395     {
 396       GNUNET_asprintf (&p->emsg,
 397                        _("Upload failed: %s"),
 398                        emsg);
 399       GNUNET_free (emsg);
 400       pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
 401       pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
 402       pi.value.publish.specifics.error.message = p->emsg;
 403       p->client_info =  GNUNET_FS_publish_make_status_ (&pi, sc, p, 0);
 404     }
 405   /* continue with main */
 406   sc->upload_task
 407     = GNUNET_SCHEDULER_add_with_priority (sc->h->sched,
 408                                           GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 409                                           &GNUNET_FS_publish_main_,
 410                                           sc);
 411 }
 412
 413
 414 /**
 415  * Function called asking for the current (encoded)
 416  * block to be processed.  After processing the
 417  * client should either call "GNUNET_FS_tree_encode_next"
 418  * or (on error) "GNUNET_FS_tree_encode_finish".
 419  *
 420  * @param cls closure
 421  * @param query the query for the block (key for lookup in the datastore)
 422  * @param offset offset of the block in the file
 423  * @param type type of the block (IBLOCK or DBLOCK)
 424  * @param block the (encrypted) block
 425  * @param block_size size of block (in bytes)
 426  */
 427 static void
 428 block_proc (void *cls,
 429             const GNUNET_HashCode *query,
 430             uint64_t offset,
 431             enum GNUNET_BLOCK_Type type,
 432             const void *block,
 433             uint16_t block_size)
 434 {
 435   struct GNUNET_FS_PublishContext *sc = cls;
 436   struct GNUNET_FS_FileInformation *p;
 437   struct PutContCtx * dpc_cls;
 438   struct OnDemandBlock odb;
 439
 440   p = sc->fi_pos;
 441   if (NULL == sc->dsh)
 442     {
 443       sc->upload_task
 444         = GNUNET_SCHEDULER_add_with_priority (sc->h->sched,
 445                                               GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 446                                               &GNUNET_FS_publish_main_,
 447                                               sc);
 448       return;
 449     }
 450
 451   GNUNET_assert (GNUNET_NO == sc->in_network_wait);
 452   sc->in_network_wait = GNUNET_YES;
 453   dpc_cls = GNUNET_malloc(sizeof(struct PutContCtx));
 454   dpc_cls->cont = &GNUNET_FS_publish_main_;
 455   dpc_cls->cont_cls = sc;
 456   dpc_cls->sc = sc;
 457   dpc_cls->p = p;
 458   if ( (! p->is_directory) &&
 459        (GNUNET_YES == p->data.file.do_index) &&
 460        (type == GNUNET_BLOCK_TYPE_DBLOCK) )
 461     {
 462 #if DEBUG_PUBLISH
 463       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 464                   "Indexing block `%s' for offset %llu with index size %u\n",
 465                   GNUNET_h2s (query),
 466                   (unsigned long long) offset,
 467                   sizeof (struct OnDemandBlock));
 468 #endif
 469       odb.offset = GNUNET_htonll (offset);
 470       odb.file_id = p->data.file.file_id;
 471       GNUNET_DATASTORE_put (sc->dsh,
 472                             sc->rid,
 473                             query,
 474                             sizeof(struct OnDemandBlock),
 475                             &odb,
 476                             GNUNET_BLOCK_TYPE_ONDEMAND,
 477                             p->priority,
 478                             p->anonymity,
 479                             p->expirationTime,
 480                             GNUNET_CONSTANTS_SERVICE_TIMEOUT,
 481                             &ds_put_cont,
 482                             dpc_cls);
 483       return;
 484     }
 485 #if DEBUG_PUBLISH
 486   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 487               "Publishing block `%s' for offset %llu with size %u\n",
 488               GNUNET_h2s (query),
 489               (unsigned long long) offset,
 490               (unsigned int) block_size);
 491 #endif
 492   GNUNET_DATASTORE_put (sc->dsh,
 493                         sc->rid,
 494                         query,
 495                         block_size,
 496                         block,
 497                         type,
 498                         p->priority,
 499                         p->anonymity,
 500                         p->expirationTime,
 501                         GNUNET_CONSTANTS_SERVICE_TIMEOUT,
 502                         &ds_put_cont,
 503                         dpc_cls);
 504 }
 505
 506
 507 /**
 508  * Function called with information about our
 509  * progress in computing the tree encoding.
 510  *
 511  * @param cls closure
 512  * @param offset where are we in the file
 513  * @param pt_block plaintext of the currently processed block
 514  * @param pt_size size of pt_block
 515  * @param depth depth of the block in the tree
 516  */
 517 static void
 518 progress_proc (void *cls,
 519                uint64_t offset,
 520                const void *pt_block,
 521                size_t pt_size,
 522                unsigned int depth)
 523 {
 524   struct GNUNET_FS_PublishContext *sc = cls;
 525   struct GNUNET_FS_FileInformation *p;
 526   struct GNUNET_FS_ProgressInfo pi;
 527
 528   p = sc->fi_pos;
 529   pi.status = GNUNET_FS_STATUS_PUBLISH_PROGRESS;
 530   pi.value.publish.specifics.progress.data = pt_block;
 531   pi.value.publish.specifics.progress.offset = offset;
 532   pi.value.publish.specifics.progress.data_len = pt_size;
 533   pi.value.publish.specifics.progress.depth = depth;
 534   p->client_info = GNUNET_FS_publish_make_status_ (&pi, sc, p, offset);
 535 }
 536
 537
 538 /**
 539  * We are uploading a file or directory; load (if necessary) the next
 540  * block into memory, encrypt it and send it to the FS service.  Then
 541  * continue with the main task.
 542  *
 543  * @param sc overall upload data
 544  */
 545 static void
 546 publish_content (struct GNUNET_FS_PublishContext *sc)
 547 {
 548   struct GNUNET_FS_FileInformation *p;
 549   char *emsg;
 550   struct GNUNET_FS_DirectoryBuilder *db;
 551   struct GNUNET_FS_FileInformation *dirpos;
 552   void *raw_data;
 553   uint64_t size;
 554
 555   p = sc->fi_pos;
 556   if (NULL == p->te)
 557     {
 558       if (p->is_directory)
 559         {
 560           db = GNUNET_FS_directory_builder_create (p->meta);
 561           dirpos = p->data.dir.entries;
 562           while (NULL != dirpos)
 563             {
 564               if (dirpos->is_directory)
 565                 {
 566                   raw_data = dirpos->data.dir.dir_data;
 567                   dirpos->data.dir.dir_data = NULL;
 568                 }
 569               else
 570                 {
 571                   raw_data = NULL;
 572                   if ( (dirpos->data.file.file_size < MAX_INLINE_SIZE) &&
 573                        (dirpos->data.file.file_size > 0) )
 574                     {
 575                       raw_data = GNUNET_malloc (dirpos->data.file.file_size);
 576                       emsg = NULL;
 577                       if (dirpos->data.file.file_size !=
 578                           dirpos->data.file.reader (dirpos->data.file.reader_cls,
 579                                                     0,
 580                                                     dirpos->data.file.file_size,
 581                                                     raw_data,
 582                                                     &emsg))
 583                         {
 584                           GNUNET_free_non_null (emsg);
 585                           GNUNET_free (raw_data);
 586                           raw_data = NULL;
 587                         }
 588                     }
 589                 }
 590               GNUNET_FS_directory_builder_add (db,
 591                                                dirpos->chk_uri,
 592                                                dirpos->meta,
 593                                                raw_data);
 594               GNUNET_free_non_null (raw_data);
 595               dirpos = dirpos->next;
 596             }
 597           GNUNET_FS_directory_builder_finish (db,
 598                                               &p->data.dir.dir_size,
 599                                               &p->data.dir.dir_data);
 600         }
 601       size = (p->is_directory)
 602         ? p->data.dir.dir_size
 603         : p->data.file.file_size;
 604       p->te = GNUNET_FS_tree_encoder_create (sc->h,
 605                                              size,
 606                                              sc,
 607                                              &block_reader,
 608                                              &block_proc,
 609                                              &progress_proc,
 610                                              &encode_cont);
 611
 612     }
 613   GNUNET_FS_tree_encoder_next (p->te);
 614 }
 615
 616
 617 /**
 618  * Process the response (or lack thereof) from
 619  * the "fs" service to our 'start index' request.
 620  *
 621  * @param cls closure (of type "struct GNUNET_FS_PublishContext*"_)
 622  * @param msg the response we got
 623  */
 624 static void
 625 process_index_start_response (void *cls,
 626                               const struct GNUNET_MessageHeader *msg)
 627 {
 628   struct GNUNET_FS_PublishContext *sc = cls;
 629   struct GNUNET_FS_FileInformation *p;
 630   const char *emsg;
 631   uint16_t msize;
 632
 633   GNUNET_CLIENT_disconnect (sc->client, GNUNET_NO);
 634   sc->client = NULL;
 635   p = sc->fi_pos;
 636   if (msg == NULL)
 637     {
 638       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 639                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 640                   p->filename,
 641                   _("timeout on index-start request to `fs' service"));
 642       p->data.file.do_index = GNUNET_NO;
 643       publish_content (sc);
 644       return;
 645     }
 646   if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_FS_INDEX_START_OK)
 647     {
 648       msize = ntohs (msg->size);
 649       emsg = (const char *) &msg[1];
 650       if ( (msize <= sizeof (struct GNUNET_MessageHeader)) ||
 651            (emsg[msize - sizeof(struct GNUNET_MessageHeader) - 1] != '\0') )
 652         emsg = gettext_noop ("unknown error");
 653       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 654                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 655                   p->filename,
 656                   gettext (emsg));
 657       p->data.file.do_index = GNUNET_NO;
 658       publish_content (sc);
 659       return;
 660     }
 661   p->data.file.index_start_confirmed = GNUNET_YES;
 662   /* success! continue with indexing */
 663   publish_content (sc);
 664 }
 665
 666
 667 /**
 668  * Function called once the hash computation over an
 669  * indexed file has completed.
 670  *
 671  * @param cls closure, our publishing context
 672  * @param res resulting hash, NULL on error
 673  */
 674 static void
 675 hash_for_index_cb (void *cls,
 676                    const GNUNET_HashCode *
 677                    res)
 678 {
 679   struct GNUNET_FS_PublishContext *sc = cls;
 680   struct GNUNET_FS_FileInformation *p;
 681   struct IndexStartMessage *ism;
 682   size_t slen;
 683   struct GNUNET_CLIENT_Connection *client;
 684   uint32_t dev;
 685   uint64_t ino;
 686   char *fn;
 687
 688   p = sc->fi_pos;
 689   if (NULL == res)
 690     {
 691       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 692                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 693                   p->filename,
 694                   _("failed to compute hash"));
 695       p->data.file.do_index = GNUNET_NO;
 696       publish_content (sc);
 697       return;
 698     }
 699   if (GNUNET_YES == p->data.file.index_start_confirmed)
 700     {
 701       publish_content (sc);
 702       return;
 703     }
 704   fn = GNUNET_STRINGS_filename_expand (p->filename);
 705   slen = strlen (fn) + 1;
 706   if (slen > GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof(struct IndexStartMessage))
 707     {
 708       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 709                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 710                   fn,
 711                   _("filename too long"));
 712       GNUNET_free (fn);
 713       p->data.file.do_index = GNUNET_NO;
 714       publish_content (sc);
 715       return;
 716     }
 717 #if DEBUG_PUBLISH
 718   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 719               "Hash of indexed file `%s' is `%s'\n",
 720               p->data.file.filename,
 721               GNUNET_h2s (res));
 722 #endif
 723   client = GNUNET_CLIENT_connect (sc->h->sched,
 724                                   "fs",
 725                                   sc->h->cfg);
 726   if (NULL == client)
 727     {
 728       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 729                   _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 730                   p->filename,
 731                   _("could not connect to `fs' service"));
 732       p->data.file.do_index = GNUNET_NO;
 733       publish_content (sc);
 734       GNUNET_free (fn);
 735       return;
 736     }
 737   p->data.file.file_id = *res;
 738   p->data.file.have_hash = GNUNET_YES;
 739   ism = GNUNET_malloc (sizeof(struct IndexStartMessage) +
 740                        slen);
 741   ism->header.size = htons(sizeof(struct IndexStartMessage) +
 742                            slen);
 743   ism->header.type = htons(GNUNET_MESSAGE_TYPE_FS_INDEX_START);
 744   if (GNUNET_OK ==
 745       GNUNET_DISK_file_get_identifiers (p->filename,
 746                                         &dev,
 747                                         &ino))
 748     {
 749       ism->device = htonl (dev);
 750       ism->inode = GNUNET_htonll(ino);
 751     }
 752   else
 753     {
 754       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 755                   _("Failed to get file identifiers for `%s'\n"),
 756                   p->filename);
 757     }
 758   ism->file_id = *res;
 759   memcpy (&ism[1],
 760           fn,
 761           slen);
 762   GNUNET_free (fn);
 763   sc->client = client;
 764   GNUNET_break (GNUNET_YES ==
 765                 GNUNET_CLIENT_transmit_and_get_response (client,
 766                                                          &ism->header,
 767                                                          GNUNET_TIME_UNIT_FOREVER_REL,
 768                                                          GNUNET_YES,
 769                                                          &process_index_start_response,
 770                                                          sc));
 771   GNUNET_free (ism);
 772 }
 773
 774
 775 /**
 776  * Main function that performs the upload.
 777  *
 778  * @param cls "struct GNUNET_FS_PublishContext" identifies the upload
 779  * @param tc task context
 780  */
 781 void
 782 GNUNET_FS_publish_main_ (void *cls,
 783                          const struct GNUNET_SCHEDULER_TaskContext *tc)
 784 {
 785   struct GNUNET_FS_PublishContext *sc = cls;
 786   struct GNUNET_FS_ProgressInfo pi;
 787   struct GNUNET_FS_FileInformation *p;
 788   char *fn;
 789
 790   sc->upload_task = GNUNET_SCHEDULER_NO_TASK;
 791   p = sc->fi_pos;
 792   if (NULL == p)
 793     {
 794       /* upload of entire hierarchy complete,
 795          publish namespace entries */
 796       publish_sblock (sc);
 797       return;
 798     }
 799   /* find starting position */
 800   while ( (p->is_directory) &&
 801           (NULL != p->data.dir.entries) &&
 802           (NULL == p->emsg) &&
 803           (NULL == p->data.dir.entries->chk_uri) )
 804     {
 805       p = p->data.dir.entries;
 806       sc->fi_pos = p;
 807     }
 808   /* abort on error */
 809   if (NULL != p->emsg)
 810     {
 811       /* error with current file, abort all
 812          related files as well! */
 813       while (NULL != p->dir)
 814         {
 815           fn = GNUNET_CONTAINER_meta_data_get_by_type (p->meta,
 816                                                        EXTRACTOR_METATYPE_FILENAME);
 817           p = p->dir;
 818           if (fn != NULL)
 819             {
 820               GNUNET_asprintf (&p->emsg,
 821                                _("Recursive upload failed at `%s': %s"),
 822                                fn,
 823                                p->emsg);
 824               GNUNET_free (fn);
 825             }
 826           else
 827             {
 828               GNUNET_asprintf (&p->emsg,
 829                                _("Recursive upload failed: %s"),
 830                                p->emsg);
 831             }
 832           pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
 833           pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
 834           pi.value.publish.specifics.error.message = p->emsg;
 835           p->client_info = GNUNET_FS_publish_make_status_ (&pi, sc, p, 0);
 836         }
 837       sc->all_done = GNUNET_YES;
 838       return;
 839     }
 840   /* handle completion */
 841   if (NULL != p->chk_uri)
 842     {
 843       /* upload of "p" complete, publish KBlocks! */
 844       if (p->keywords != NULL)
 845         {
 846           GNUNET_FS_publish_ksk (sc->h,
 847                                  p->keywords,
 848                                  p->meta,
 849                                  p->chk_uri,
 850                                  p->expirationTime,
 851                                  p->anonymity,
 852                                  p->priority,
 853                                  sc->options,
 854                                  &publish_kblocks_cont,
 855                                  sc);
 856         }
 857       else
 858         {
 859           publish_kblocks_cont (sc,
 860                                 p->chk_uri,
 861                                 NULL);
 862         }
 863       return;
 864     }
 865   if ( (!p->is_directory) &&
 866        (p->data.file.do_index) )
 867     {
 868       if (NULL == p->filename)
 869         {
 870           p->data.file.do_index = GNUNET_NO;
 871           GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 872                       _("Can not index file `%s': %s.  Will try to insert instead.\n"),
 873                       "<no-name>",
 874                       _("needs to be an actual file"));
 875           publish_content (sc);
 876           return;
 877         }
 878       if (p->data.file.have_hash)
 879         hash_for_index_cb (sc,
 880                            &p->data.file.file_id);
 881       else
 882         {
 883           p->start_time = GNUNET_TIME_absolute_get ();
 884           GNUNET_CRYPTO_hash_file (sc->h->sched,
 885                                    GNUNET_SCHEDULER_PRIORITY_IDLE,
 886                                    p->filename,
 887                                    HASHING_BLOCKSIZE,
 888                                    &hash_for_index_cb,
 889                                    sc);
 890         }
 891       return;
 892     }
 893   publish_content (sc);
 894 }
 895
 896
 897 /**
 898  * Signal the FS's progress function that we are starting
 899  * an upload.
 900  *
 901  * @param cls closure (of type "struct GNUNET_FS_PublishContext*")
 902  * @param fi the entry in the publish-structure
 903  * @param length length of the file or directory
 904  * @param meta metadata for the file or directory (can be modified)
 905  * @param uri pointer to the keywords that will be used for this entry (can be modified)
 906  * @param anonymity pointer to selected anonymity level (can be modified)
 907  * @param priority pointer to selected priority (can be modified)
 908  * @param expirationTime pointer to selected expiration time (can be modified)
 909  * @param client_info pointer to client context set upon creation (can be modified)
 910  * @return GNUNET_OK to continue (always)
 911  */
 912 static int
 913 fip_signal_start(void *cls,
 914                  struct GNUNET_FS_FileInformation *fi,
 915                  uint64_t length,
 916                  struct GNUNET_CONTAINER_MetaData *meta,
 917                  struct GNUNET_FS_Uri **uri,
 918                  uint32_t *anonymity,
 919                  uint32_t *priority,
 920                  struct GNUNET_TIME_Absolute *expirationTime,
 921                  void **client_info)
 922 {
 923   struct GNUNET_FS_PublishContext *sc = cls;
 924   struct GNUNET_FS_ProgressInfo pi;
 925
 926   pi.status = GNUNET_FS_STATUS_PUBLISH_START;
 927   *client_info = GNUNET_FS_publish_make_status_ (&pi, sc, fi, 0);
 928   return GNUNET_OK;
 929 }
 930
 931
 932 /**
 933  * Publish a file or directory.
 934  *
 935  * @param h handle to the file sharing subsystem
 936  * @param fi information about the file or directory structure to publish
 937  * @param namespace namespace to publish the file in, NULL for no namespace
 938  * @param nid identifier to use for the publishd content in the namespace
 939  *        (can be NULL, must be NULL if namespace is NULL)
 940  * @param nuid update-identifier that will be used for future updates
 941  *        (can be NULL, must be NULL if namespace or nid is NULL)
 942  * @param options options for the publication
 943  * @return context that can be used to control the publish operation
 944  */
 945 struct GNUNET_FS_PublishContext *
 946 GNUNET_FS_publish_start (struct GNUNET_FS_Handle *h,
 947                          struct GNUNET_FS_FileInformation *fi,
 948                          struct GNUNET_FS_Namespace *namespace,
 949                          const char *nid,
 950                          const char *nuid,
 951                          enum GNUNET_FS_PublishOptions options)
 952 {
 953   struct GNUNET_FS_PublishContext *ret;
 954   struct GNUNET_DATASTORE_Handle *dsh;
 955
 956   if (0 == (options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY))
 957     {
 958       dsh = GNUNET_DATASTORE_connect (h->cfg,
 959                                       h->sched);
 960       if (NULL == dsh)
 961         return NULL;
 962     }
 963   else
 964     {
 965       dsh = NULL;
 966     }
 967   ret = GNUNET_malloc (sizeof (struct GNUNET_FS_PublishContext));
 968   ret->dsh = dsh;
 969   ret->h = h;
 970   ret->fi = fi;
 971   ret->namespace = namespace;
 972   if (namespace != NULL)
 973     {
 974       namespace->rc++;
 975       GNUNET_assert (NULL != nid);
 976       ret->nid = GNUNET_strdup (nid);
 977       if (NULL != nuid)
 978         ret->nuid = GNUNET_strdup (nuid);
 979     }
 980   GNUNET_FS_publish_sync_ (ret);
 981   /* signal start */
 982   GNUNET_FS_file_information_inspect (ret->fi,
 983                                       &fip_signal_start,
 984                                       ret);
 985   ret->fi_pos = ret->fi;
 986
 987   // FIXME: calculate space needed for "fi"
 988   // and reserve as first task (then trigger
 989   // "publish_main" from that continuation)!
 990   ret->upload_task
 991     = GNUNET_SCHEDULER_add_with_priority (h->sched,
 992                                           GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
 993                                           &GNUNET_FS_publish_main_,
 994                                           ret);
 995   return ret;
 996 }
 997
 998
 999 /**
1000  * Signal the FS's progress function that we are stopping
1001  * an upload.
1002  *
1003  * @param cls closure (of type "struct GNUNET_FS_PublishContext*")
1004  * @param fi the entry in the publish-structure
1005  * @param length length of the file or directory
1006  * @param meta metadata for the file or directory (can be modified)
1007  * @param uri pointer to the keywords that will be used for this entry (can be modified)
1008  * @param anonymity pointer to selected anonymity level (can be modified)
1009  * @param priority pointer to selected priority (can be modified)
1010  * @param expirationTime pointer to selected expiration time (can be modified)
1011  * @param client_info pointer to client context set upon creation (can be modified)
1012  * @return GNUNET_OK to continue (always)
1013  */
1014 static int
1015 fip_signal_stop(void *cls,
1016                 struct GNUNET_FS_FileInformation *fi,
1017                 uint64_t length,
1018                 struct GNUNET_CONTAINER_MetaData *meta,
1019                 struct GNUNET_FS_Uri **uri,
1020                 uint32_t *anonymity,
1021                 uint32_t *priority,
1022                 struct GNUNET_TIME_Absolute *expirationTime,
1023                 void **client_info)
1024 {
1025   struct GNUNET_FS_PublishContext*sc = cls;
1026   struct GNUNET_FS_ProgressInfo pi;
1027   uint64_t off;
1028
1029   if (fi->serialization != NULL)
1030     {
1031       if (0 != UNLINK (fi->serialization))
1032         {
1033           GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
1034                                     "unlink",
1035                                     fi->serialization);
1036         }
1037       GNUNET_free (fi->serialization);
1038       fi->serialization = NULL;
1039     }
1040   off = (fi->chk_uri == NULL) ? 0 : length;
1041   pi.status = GNUNET_FS_STATUS_PUBLISH_STOPPED;
1042   GNUNET_break (NULL == GNUNET_FS_publish_make_status_ (&pi, sc, fi, off));
1043   *client_info = NULL;
1044   return GNUNET_OK;
1045 }
1046
1047
1048 /**
1049  * Stop an upload.  Will abort incomplete uploads (but
1050  * not remove blocks that have already been publishd) or
1051  * simply clean up the state for completed uploads.
1052  * Must NOT be called from within the event callback!
1053  *
1054  * @param pc context for the upload to stop
1055  */
1056 void
1057 GNUNET_FS_publish_stop (struct GNUNET_FS_PublishContext *pc)
1058 {
1059   if (GNUNET_SCHEDULER_NO_TASK != pc->upload_task)
1060     GNUNET_SCHEDULER_cancel (pc->h->sched, pc->upload_task);
1061   if (pc->serialization != NULL)
1062     {
1063       if (0 != UNLINK (pc->serialization))
1064         GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
1065                                   "unlink",
1066                                   pc->serialization);
1067       GNUNET_free (pc->serialization);
1068       pc->serialization = NULL;
1069     }
1070   GNUNET_FS_file_information_inspect (pc->fi,
1071                                       &fip_signal_stop,
1072                                       pc);
1073   if (GNUNET_YES == pc->in_network_wait)
1074     {
1075       pc->in_network_wait = GNUNET_SYSERR;
1076       return;
1077     }
1078   publish_cleanup (pc);
1079 }
1080
1081
1082 /**
1083  * Context for the KSK publication.
1084  */
1085 struct PublishKskContext
1086 {
1087
1088   /**
1089    * Keywords to use.
1090    */
1091   struct GNUNET_FS_Uri *ksk_uri;
1092
1093   /**
1094    * Global FS context.
1095    */
1096   struct GNUNET_FS_Handle *h;
1097
1098   /**
1099    * The master block that we are sending
1100    * (in plaintext), has "mdsize+slen" more
1101    * bytes than the struct would suggest.
1102    */
1103   struct KBlock *kb;
1104
1105   /**
1106    * Buffer of the same size as "kb" for
1107    * the encrypted version.
1108    */
1109   struct KBlock *cpy;
1110
1111   /**
1112    * Handle to the datastore, NULL if we are just
1113    * simulating.
1114    */
1115   struct GNUNET_DATASTORE_Handle *dsh;
1116
1117   /**
1118    * Function to call once we're done.
1119    */
1120   GNUNET_FS_PublishContinuation cont;
1121
1122   /**
1123    * Closure for cont.
1124    */
1125   void *cont_cls;
1126
1127   /**
1128    * When should the KBlocks expire?
1129    */
1130   struct GNUNET_TIME_Absolute expirationTime;
1131
1132   /**
1133    * Size of the serialized metadata.
1134    */
1135   ssize_t mdsize;
1136
1137   /**
1138    * Size of the (CHK) URI as a string.
1139    */
1140   size_t slen;
1141
1142   /**
1143    * Keyword that we are currently processing.
1144    */
1145   unsigned int i;
1146
1147   /**
1148    * Anonymity level for the KBlocks.
1149    */
1150   uint32_t anonymity;
1151
1152   /**
1153    * Priority for the KBlocks.
1154    */
1155   uint32_t priority;
1156 };
1157
1158
1159 /**
1160  * Continuation of "GNUNET_FS_publish_ksk" that performs
1161  * the actual publishing operation (iterating over all
1162  * of the keywords).
1163  *
1164  * @param cls closure of type "struct PublishKskContext*"
1165  * @param tc unused
1166  */
1167 static void
1168 publish_ksk_cont (void *cls,
1169                   const struct GNUNET_SCHEDULER_TaskContext *tc);
1170
1171
1172 /**
1173  * Function called by the datastore API with
1174  * the result from the PUT request.
1175  *
1176  * @param cls closure of type "struct PublishKskContext*"
1177  * @param success GNUNET_OK on success
1178  * @param msg error message (or NULL)
1179  */
1180 static void
1181 kb_put_cont (void *cls,
1182              int success,
1183              const char *msg)
1184 {
1185   struct PublishKskContext *pkc = cls;
1186
1187   if (GNUNET_OK != success)
1188     {
1189       GNUNET_DATASTORE_disconnect (pkc->dsh, GNUNET_NO);
1190       GNUNET_free (pkc->cpy);
1191       GNUNET_free (pkc->kb);
1192       pkc->cont (pkc->cont_cls,
1193                  NULL,
1194                  msg);
1195       GNUNET_FS_uri_destroy (pkc->ksk_uri);
1196       GNUNET_free (pkc);
1197       return;
1198     }
1199   GNUNET_SCHEDULER_add_continuation (pkc->h->sched,
1200                                      &publish_ksk_cont,
1201                                      pkc,
1202                                      GNUNET_SCHEDULER_REASON_PREREQ_DONE);
1203 }
1204
1205
1206 /**
1207  * Continuation of "GNUNET_FS_publish_ksk" that performs the actual
1208  * publishing operation (iterating over all of the keywords).
1209  *
1210  * @param cls closure of type "struct PublishKskContext*"
1211  * @param tc unused
1212  */
1213 static void
1214 publish_ksk_cont (void *cls,
1215                   const struct GNUNET_SCHEDULER_TaskContext *tc)
1216 {
1217   struct PublishKskContext *pkc = cls;
1218   const char *keyword;
1219   GNUNET_HashCode key;
1220   GNUNET_HashCode query;
1221   struct GNUNET_CRYPTO_AesSessionKey skey;
1222   struct GNUNET_CRYPTO_AesInitializationVector iv;
1223   struct GNUNET_CRYPTO_RsaPrivateKey *pk;
1224
1225
1226   if ( (pkc->i == pkc->ksk_uri->data.ksk.keywordCount) ||
1227        (NULL == pkc->dsh) )
1228     {
1229       if (NULL != pkc->dsh)
1230         GNUNET_DATASTORE_disconnect (pkc->dsh, GNUNET_NO);
1231       GNUNET_free (pkc->cpy);
1232       GNUNET_free (pkc->kb);
1233       pkc->cont (pkc->cont_cls,
1234                  pkc->ksk_uri,
1235                  NULL);
1236       GNUNET_FS_uri_destroy (pkc->ksk_uri);
1237       GNUNET_free (pkc);
1238       return;
1239     }
1240   keyword = pkc->ksk_uri->data.ksk.keywords[pkc->i++];
1241   /* first character of keyword indicates if it is
1242      mandatory or not -- ignore for hashing */
1243   GNUNET_CRYPTO_hash (&keyword[1], strlen (&keyword[1]), &key);
1244   GNUNET_CRYPTO_hash_to_aes_key (&key, &skey, &iv);
1245   GNUNET_CRYPTO_aes_encrypt (&pkc->kb[1],
1246                              pkc->slen + pkc->mdsize,
1247                              &skey,
1248                              &iv,
1249                              &pkc->cpy[1]);
1250   pk = GNUNET_CRYPTO_rsa_key_create_from_hash (&key);
1251   GNUNET_CRYPTO_rsa_key_get_public (pk, &pkc->cpy->keyspace);
1252   GNUNET_CRYPTO_hash (&pkc->cpy->keyspace,
1253                       sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1254                       &query);
1255   GNUNET_assert (GNUNET_OK ==
1256                  GNUNET_CRYPTO_rsa_sign (pk,
1257                                          &pkc->cpy->purpose,
1258                                          &pkc->cpy->signature));
1259   GNUNET_CRYPTO_rsa_key_free (pk);
1260   GNUNET_DATASTORE_put (pkc->dsh,
1261                         0,
1262                         &query,
1263                         pkc->mdsize +
1264                         sizeof (struct KBlock) +
1265                         pkc->slen,
1266                         pkc->cpy,
1267                         GNUNET_BLOCK_TYPE_KBLOCK,
1268                         pkc->priority,
1269                         pkc->anonymity,
1270                         pkc->expirationTime,
1271                         GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1272                         &kb_put_cont,
1273                         pkc);
1274 }
1275
1276
1277 /**
1278  * Publish a CHK under various keywords on GNUnet.
1279  *
1280  * @param h handle to the file sharing subsystem
1281  * @param ksk_uri keywords to use
1282  * @param meta metadata to use
1283  * @param uri URI to refer to in the KBlock
1284  * @param expirationTime when the KBlock expires
1285  * @param anonymity anonymity level for the KBlock
1286  * @param priority priority for the KBlock
1287  * @param options publication options
1288  * @param cont continuation
1289  * @param cont_cls closure for cont
1290  */
1291 void
1292 GNUNET_FS_publish_ksk (struct GNUNET_FS_Handle *h,
1293                        const struct GNUNET_FS_Uri *ksk_uri,
1294                        const struct GNUNET_CONTAINER_MetaData *meta,
1295                        const struct GNUNET_FS_Uri *uri,
1296                        struct GNUNET_TIME_Absolute expirationTime,
1297                        uint32_t anonymity,
1298                        uint32_t priority,
1299                        enum GNUNET_FS_PublishOptions options,
1300                        GNUNET_FS_PublishContinuation cont,
1301                        void *cont_cls)
1302 {
1303   struct PublishKskContext *pkc;
1304   char *uris;
1305   size_t size;
1306   char *kbe;
1307   char *sptr;
1308
1309   pkc = GNUNET_malloc (sizeof (struct PublishKskContext));
1310   pkc->h = h;
1311   pkc->expirationTime = expirationTime;
1312   pkc->anonymity = anonymity;
1313   pkc->priority = priority;
1314   pkc->cont = cont;
1315   pkc->cont_cls = cont_cls;
1316   if (0 == (options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY))
1317     {
1318       pkc->dsh = GNUNET_DATASTORE_connect (h->cfg,
1319                                            h->sched);
1320       if (pkc->dsh == NULL)
1321         {
1322           cont (cont_cls, NULL, _("Could not connect to datastore."));
1323           GNUNET_free (pkc);
1324           return;
1325         }
1326     }
1327   if (meta == NULL)
1328     pkc->mdsize = 0;
1329   else
1330     pkc->mdsize = GNUNET_CONTAINER_meta_data_get_serialized_size (meta);
1331   GNUNET_assert (pkc->mdsize >= 0);
1332   uris = GNUNET_FS_uri_to_string (uri);
1333   pkc->slen = strlen (uris) + 1;
1334   size = pkc->mdsize + sizeof (struct KBlock) + pkc->slen;
1335   if (size > MAX_KBLOCK_SIZE)
1336     {
1337       size = MAX_KBLOCK_SIZE;
1338       pkc->mdsize = size - sizeof (struct KBlock) - pkc->slen;
1339     }
1340   pkc->kb = GNUNET_malloc (size);
1341   kbe = (char *) &pkc->kb[1];
1342   memcpy (kbe, uris, pkc->slen);
1343   GNUNET_free (uris);
1344   sptr = &kbe[pkc->slen];
1345   if (meta != NULL)
1346     pkc->mdsize = GNUNET_CONTAINER_meta_data_serialize (meta,
1347                                                         &sptr,
1348                                                         pkc->mdsize,
1349                                                         GNUNET_CONTAINER_META_DATA_SERIALIZE_PART);
1350   if (pkc->mdsize == -1)
1351     {
1352       GNUNET_break (0);
1353       GNUNET_free (pkc->kb);
1354       if (pkc->dsh != NULL)
1355         GNUNET_DATASTORE_disconnect (pkc->dsh, GNUNET_NO);
1356       cont (cont_cls, NULL, _("Internal error."));
1357       GNUNET_free (pkc);
1358       return;
1359     }
1360   size = sizeof (struct KBlock) + pkc->slen + pkc->mdsize;
1361
1362   pkc->cpy = GNUNET_malloc (size);
1363   pkc->cpy->purpose.size = htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1364                                   sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1365                                   pkc->mdsize +
1366                                   pkc->slen);
1367   pkc->cpy->purpose.purpose = htonl(GNUNET_SIGNATURE_PURPOSE_FS_KBLOCK);
1368   pkc->ksk_uri = GNUNET_FS_uri_dup (ksk_uri);
1369   GNUNET_SCHEDULER_add_continuation (h->sched,
1370                                      &publish_ksk_cont,
1371                                      pkc,
1372                                      GNUNET_SCHEDULER_REASON_PREREQ_DONE);
1373 }
1374
1375
1376 /**
1377  * Context for the SKS publication.
1378  */
1379 struct PublishSksContext
1380 {
1381
1382   /**
1383    * Global FS context.
1384    */
1385   struct GNUNET_FS_Uri *uri;
1386
1387   /**
1388    * Handle to the datastore.
1389    */
1390   struct GNUNET_DATASTORE_Handle *dsh;
1391
1392   /**
1393    * Function to call once we're done.
1394    */
1395   GNUNET_FS_PublishContinuation cont;
1396
1397   /**
1398    * Closure for cont.
1399    */
1400   void *cont_cls;
1401
1402 };
1403
1404
1405 /**
1406  * Function called by the datastore API with
1407  * the result from the PUT (SBlock) request.
1408  *
1409  * @param cls closure of type "struct PublishSksContext*"
1410  * @param success GNUNET_OK on success
1411  * @param msg error message (or NULL)
1412  */
1413 static void
1414 sb_put_cont (void *cls,
1415              int success,
1416              const char *msg)
1417 {
1418   struct PublishSksContext *psc = cls;
1419
1420   if (NULL != psc->dsh)
1421     GNUNET_DATASTORE_disconnect (psc->dsh, GNUNET_NO);
1422   if (GNUNET_OK != success)
1423     psc->cont (psc->cont_cls,
1424                NULL,
1425                msg);
1426   else
1427     psc->cont (psc->cont_cls,
1428                psc->uri,
1429                NULL);
1430   GNUNET_FS_uri_destroy (psc->uri);
1431   GNUNET_free (psc);
1432 }
1433
1434
1435 /**
1436  * Publish an SBlock on GNUnet.
1437  *
1438  * @param h handle to the file sharing subsystem
1439  * @param namespace namespace to publish in
1440  * @param identifier identifier to use
1441  * @param update update identifier to use
1442  * @param meta metadata to use
1443  * @param uri URI to refer to in the SBlock
1444  * @param expirationTime when the SBlock expires
1445  * @param anonymity anonymity level for the SBlock
1446  * @param priority priority for the SBlock
1447  * @param options publication options
1448  * @param cont continuation
1449  * @param cont_cls closure for cont
1450  */
1451 void
1452 GNUNET_FS_publish_sks (struct GNUNET_FS_Handle *h,
1453                        struct GNUNET_FS_Namespace *namespace,
1454                        const char *identifier,
1455                        const char *update,
1456                        const struct GNUNET_CONTAINER_MetaData *meta,
1457                        const struct GNUNET_FS_Uri *uri,
1458                        struct GNUNET_TIME_Absolute expirationTime,
1459                        uint32_t anonymity,
1460                        uint32_t priority,
1461                        enum GNUNET_FS_PublishOptions options,
1462                        GNUNET_FS_PublishContinuation cont,
1463                        void *cont_cls)
1464 {
1465   struct PublishSksContext *psc;
1466   struct GNUNET_CRYPTO_AesSessionKey sk;
1467   struct GNUNET_CRYPTO_AesInitializationVector iv;
1468   struct GNUNET_FS_Uri *sks_uri;
1469   char *uris;
1470   size_t size;
1471   size_t slen;
1472   size_t nidlen;
1473   size_t idlen;
1474   ssize_t mdsize;
1475   struct SBlock *sb;
1476   struct SBlock *sb_enc;
1477   char *dest;
1478   struct GNUNET_CONTAINER_MetaData *mmeta;
1479   GNUNET_HashCode key;         /* hash of thisId = key */
1480   GNUNET_HashCode id;          /* hash of hc = identifier */
1481   GNUNET_HashCode query;       /* id ^ nsid = DB query */
1482
1483   if (NULL == meta)
1484     mmeta = GNUNET_CONTAINER_meta_data_create ();
1485   else
1486     mmeta = GNUNET_CONTAINER_meta_data_duplicate (meta);
1487   uris = GNUNET_FS_uri_to_string (uri);
1488   slen = strlen (uris) + 1;
1489   idlen = strlen (identifier);
1490   if (update == NULL)
1491     update = "";
1492   nidlen = strlen (update) + 1;
1493   mdsize = GNUNET_CONTAINER_meta_data_get_serialized_size (mmeta);
1494   size = sizeof (struct SBlock) + slen + nidlen + mdsize;
1495   if (size > MAX_SBLOCK_SIZE)
1496     {
1497       size = MAX_SBLOCK_SIZE;
1498       mdsize = size - (sizeof (struct SBlock) + slen + nidlen);
1499     }
1500   sb = GNUNET_malloc (sizeof (struct SBlock) + size);
1501   dest = (char *) &sb[1];
1502   memcpy (dest, update, nidlen);
1503   dest += nidlen;
1504   memcpy (dest, uris, slen);
1505   dest += slen;
1506   mdsize = GNUNET_CONTAINER_meta_data_serialize (mmeta,
1507                                                  &dest,
1508                                                  mdsize,
1509                                                  GNUNET_CONTAINER_META_DATA_SERIALIZE_PART);
1510   GNUNET_CONTAINER_meta_data_destroy (mmeta);
1511   if (mdsize == -1)
1512     {
1513       GNUNET_break (0);
1514       GNUNET_free (uris);
1515       GNUNET_free (sb);
1516       cont (cont_cls,
1517             NULL,
1518             _("Internal error."));
1519       return;
1520     }
1521   size = sizeof (struct SBlock) + mdsize + slen + nidlen;
1522   sb_enc = GNUNET_malloc (size);
1523   GNUNET_CRYPTO_hash (identifier, idlen, &key);
1524   GNUNET_CRYPTO_hash (&key, sizeof (GNUNET_HashCode), &id);
1525   sks_uri = GNUNET_malloc (sizeof (struct GNUNET_FS_Uri));
1526   sks_uri->type = sks;
1527   GNUNET_CRYPTO_rsa_key_get_public (namespace->key, &sb_enc->subspace);
1528   GNUNET_CRYPTO_hash (&sb_enc->subspace,
1529                       sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1530                       &sks_uri->data.sks.namespace);
1531   sks_uri->data.sks.identifier = GNUNET_strdup (identifier);
1532   GNUNET_CRYPTO_hash_xor (&id,
1533                           &sks_uri->data.sks.namespace,
1534                           &sb_enc->identifier);
1535   GNUNET_CRYPTO_hash_to_aes_key (&key, &sk, &iv);
1536   GNUNET_CRYPTO_aes_encrypt (&sb[1],
1537                              size - sizeof (struct SBlock),
1538                              &sk,
1539                              &iv,
1540                              &sb_enc[1]);
1541   sb_enc->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_FS_SBLOCK);
1542   sb_enc->purpose.size = htonl(slen + mdsize + nidlen
1543                                + sizeof(struct SBlock)
1544                                - sizeof(struct GNUNET_CRYPTO_RsaSignature));
1545   GNUNET_assert (GNUNET_OK ==
1546                  GNUNET_CRYPTO_rsa_sign (namespace->key,
1547                                          &sb_enc->purpose,
1548                                          &sb_enc->signature));
1549   psc = GNUNET_malloc (sizeof(struct PublishSksContext));
1550   psc->uri = sks_uri;
1551   psc->cont = cont;
1552   psc->cont_cls = cont_cls;
1553   if (0 != (options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY))
1554     {
1555       GNUNET_free (sb_enc);
1556       GNUNET_free (sb);
1557       sb_put_cont (psc,
1558                    GNUNET_OK,
1559                    NULL);
1560       return;
1561     }
1562   psc->dsh = GNUNET_DATASTORE_connect (h->cfg, h->sched);
1563   if (NULL == psc->dsh)
1564     {
1565       GNUNET_free (sb_enc);
1566       GNUNET_free (sb);
1567       sb_put_cont (psc,
1568                    GNUNET_NO,
1569                    _("Failed to connect to datastore."));
1570       return;
1571     }
1572   GNUNET_CRYPTO_hash_xor (&sks_uri->data.sks.namespace,
1573                           &id,
1574                           &query);
1575   GNUNET_DATASTORE_put (psc->dsh,
1576                         0,
1577                         &sb_enc->identifier,
1578                         size,
1579                         sb_enc,
1580                         GNUNET_BLOCK_TYPE_SBLOCK,
1581                         priority,
1582                         anonymity,
1583                         expirationTime,
1584                         GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1585                         &sb_put_cont,
1586                         psc);
1587
1588   GNUNET_free (sb);
1589   GNUNET_free (sb_enc);
1590 }
1591
1592 /* end of fs_publish.c */