aboutsummaryrefslogtreecommitdiff
path: root/src/fs/fs_publish.c
blob: aa7f794be2124ceff4c839553f9540dc43388b9f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
/*
     This file is part of GNUnet.
     (C) 2009, 2010 Christian Grothoff (and other contributing authors)

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 2, or (at your
     option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file fs/fs_publish.c
 * @brief publish a file or directory in GNUnet
 * @see http://gnunet.org/encoding
 * @author Krista Bennett
 * @author Christian Grothoff
 *
 * TODO:
 * - indexing cleanup: unindex on failure (can wait)
 * - datastore reservation support (optimization)
 * - location URIs (publish with anonymity-level zero)
 */

#include "platform.h"
#include "gnunet_constants.h"
#include "gnunet_signatures.h"
#include "gnunet_util_lib.h"
#include "gnunet_fs_service.h"
#include "fs.h"
#include "fs_tree.h"

#define DEBUG_PUBLISH GNUNET_NO


/**
 * Context for "ds_put_cont".
 */
struct PutContCtx
{
  /**
   * Current publishing context.
   */
  struct GNUNET_FS_PublishContext *sc;

  /**
   * Specific file with the block.
   */
  struct GNUNET_FS_FileInformation *p;

  /**
   * Function to run next, if any (can be NULL).
   */
  GNUNET_SCHEDULER_Task cont;

  /**
   * Closure for cont.
   */
  void *cont_cls;
};


/**
 * Fill in all of the generic fields for 
 * a publish event and call the callback.
 *
 * @param pi structure to fill in
 * @param sc overall publishing context
 * @param p file information for the file being published
 * @param offset where in the file are we so far
 * @return value returned from callback
 */
void *
GNUNET_FS_publish_make_status_ (struct GNUNET_FS_ProgressInfo *pi,
				struct GNUNET_FS_PublishContext *sc,
				const struct GNUNET_FS_FileInformation *p,
				uint64_t offset)
{
  pi->value.publish.sc = sc;
  pi->value.publish.fi = p;
  pi->value.publish.cctx
    = p->client_info;
  pi->value.publish.pctx
    = (NULL == p->dir) ? NULL : p->dir->client_info;
  pi->value.publish.filename = p->filename;
  pi->value.publish.size 
    = (p->is_directory) ? p->data.dir.dir_size : p->data.file.file_size;
  pi->value.publish.eta 
    = GNUNET_TIME_calculate_eta (p->start_time,
				 offset,
				 pi->value.publish.size);
  pi->value.publish.completed = offset;
  pi->value.publish.duration = GNUNET_TIME_absolute_get_duration (p->start_time);
  pi->value.publish.anonymity = p->anonymity;
  return sc->h->upcb (sc->h->upcb_cls,
		      pi);
}


/**
 * Cleanup the publish context, we're done with it.
 *
 * @param pc struct to clean up after
 */
static void
publish_cleanup (struct GNUNET_FS_PublishContext *pc)
{
  GNUNET_FS_file_information_destroy (pc->fi, NULL, NULL);
  if (pc->namespace != NULL)
    GNUNET_FS_namespace_delete (pc->namespace, GNUNET_NO);
  GNUNET_free_non_null (pc->nid);  
  GNUNET_free_non_null (pc->nuid);
  GNUNET_free_non_null (pc->serialization);
  if (pc->dsh != NULL)
    GNUNET_DATASTORE_disconnect (pc->dsh, GNUNET_NO);
  if (pc->client != NULL)
    GNUNET_CLIENT_disconnect (pc->client, GNUNET_NO);
  GNUNET_free (pc);
}


/**
 * Function called by the datastore API with
 * the result from the PUT request.
 *
 * @param cls our closure
 * @param success GNUNET_OK on success
 * @param msg error message (or NULL)
 */
static void
ds_put_cont (void *cls,
	     int success,
 	     const char *msg)
{
  struct PutContCtx *pcc = cls;
  struct GNUNET_FS_ProgressInfo pi;

  if (GNUNET_SYSERR == pcc->sc->in_network_wait)
    {
      /* we were aborted in the meantime,
	 finish shutdown! */
      publish_cleanup (pcc->sc);
      GNUNET_free (pcc);
      return;
    }
  GNUNET_assert (GNUNET_YES == pcc->sc->in_network_wait);
  pcc->sc->in_network_wait = GNUNET_NO;
  if (GNUNET_OK != success)
    {
      GNUNET_asprintf (&pcc->p->emsg, 
		       _("Upload failed: %s"),
		       msg);
      pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
      pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
      pi.value.publish.specifics.error.message = pcc->p->emsg;
      pcc->p->client_info = GNUNET_FS_publish_make_status_ (&pi, pcc->sc, pcc->p, 0);
    }
  if (NULL != pcc->cont)
    pcc->sc->upload_task 
      = GNUNET_SCHEDULER_add_with_priority (pcc->sc->h->sched,
					    GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
					    pcc->cont,
					    pcc->cont_cls);
  GNUNET_free (pcc);
}


/**
 * Generate the callback that signals clients
 * that a file (or directory) has been completely
 * published.
 *
 * @param p the completed upload
 * @param sc context of the publication
 */
static void 
signal_publish_completion (struct GNUNET_FS_FileInformation *p,
			   struct GNUNET_FS_PublishContext *sc)
{
  struct GNUNET_FS_ProgressInfo pi;
  
  pi.status = GNUNET_FS_STATUS_PUBLISH_COMPLETED;
  pi.value.publish.eta = GNUNET_TIME_UNIT_ZERO;
  pi.value.publish.specifics.completed.chk_uri = p->chk_uri;
  p->client_info = GNUNET_FS_publish_make_status_ (&pi, sc, p,
						   GNUNET_ntohll (p->chk_uri->data.chk.file_length));
}


/**
 * Generate the callback that signals clients
 * that a file (or directory) has encountered
 * a problem during publication.
 *
 * @param p the upload that had trouble
 * @param sc context of the publication
 * @param emsg error message
 */
static void 
signal_publish_error (struct GNUNET_FS_FileInformation *p,
		      struct GNUNET_FS_PublishContext *sc,
		      const char *emsg)
{
  struct GNUNET_FS_ProgressInfo pi;
  
  p->emsg = GNUNET_strdup (emsg);
  pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
  pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
  pi.value.publish.specifics.error.message =emsg;
  p->client_info = GNUNET_FS_publish_make_status_ (&pi, sc, p, 0);
}


/**
 * We've finished publishing the SBlock as part of a larger upload.
 * Check the result and complete the larger upload.
 *
 * @param cls the "struct GNUNET_FS_PublishContext*" of the larger upload
 * @param uri URI of the published SBlock
 * @param emsg NULL on success, otherwise error message
 */
static void
publish_sblocks_cont (void *cls,
		      const struct GNUNET_FS_Uri *uri,
		      const char *emsg)
{
  struct GNUNET_FS_PublishContext *pc = cls;
  if (NULL != emsg)
    {
      signal_publish_error (pc->fi,
			    pc,
			    emsg);
      GNUNET_FS_publish_sync_ (pc);
      return;
    }  
  // FIXME: release the datastore reserve here!
  signal_publish_completion (pc->fi, pc);
  pc->all_done = GNUNET_YES;
  GNUNET_FS_publish_sync_ (pc);
}


/**
 * We are almost done publishing the structure,
 * add SBlocks (if needed).
 *
 * @param sc overall upload data
 */
static void
publish_sblock (struct GNUNET_FS_PublishContext *sc)
{
  if (NULL != sc->namespace)
    GNUNET_FS_publish_sks (sc->h,
			   sc->namespace,
			   sc->nid,
			   sc->nuid,
			   sc->fi->meta,
			   sc->fi->chk_uri,
			   sc->fi->expirationTime,
			   sc->fi->anonymity,
			   sc->fi->priority,
			   sc->options,
			   &publish_sblocks_cont,
			   sc);
  else
    publish_sblocks_cont (sc, NULL, NULL);
}


/**
 * We've finished publishing a KBlock as part of a larger upload.
 * Check the result and continue the larger upload.
 *
 * @param cls the "struct GNUNET_FS_PublishContext*"
 *        of the larger upload
 * @param uri URI of the published blocks
 * @param emsg NULL on success, otherwise error message
 */
static void
publish_kblocks_cont (void *cls,
		      const struct GNUNET_FS_Uri *uri,
		      const char *emsg)
{
  struct GNUNET_FS_PublishContext *pc = cls;
  struct GNUNET_FS_FileInformation *p = pc->fi_pos;

  if (NULL != emsg)
    {
      signal_publish_error (p, pc, emsg);
      GNUNET_FS_file_information_sync_ (p);
      GNUNET_FS_publish_sync_ (pc);
      pc->upload_task 
	= GNUNET_SCHEDULER_add_with_priority (pc->h->sched,
					      GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
					      &GNUNET_FS_publish_main_,
					      pc);
      return;
    }
  if (NULL != p->dir)
    signal_publish_completion (p, pc);    
  /* move on to next file */
  if (NULL != p->next)
    pc->fi_pos = p->next;
  else
    pc->fi_pos = p->dir;
  GNUNET_FS_publish_sync_ (pc);
  pc->upload_task 
    = GNUNET_SCHEDULER_add_with_priority (pc->h->sched,
					  GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
					  &GNUNET_FS_publish_main_,
					  pc);
}


/**
 * Function called by the tree encoder to obtain
 * a block of plaintext data (for the lowest level
 * of the tree).
 *
 * @param cls our publishing context
 * @param offset identifies which block to get
 * @param max (maximum) number of bytes to get; returning
 *        fewer will also cause errors
 * @param buf where to copy the plaintext buffer
 * @param emsg location to store an error message (on error)
 * @return number of bytes copied to buf, 0 on error
 */
static size_t
block_reader (void *cls,
	      uint64_t offset,
	      size_t max, 
	      void *buf,
	      char **emsg)
{
  struct GNUNET_FS_PublishContext *sc = cls;
  struct GNUNET_FS_FileInformation *p;
  size_t pt_size;
  const char *dd;

  p = sc->fi_pos;
  if (p->is_directory)
    {
      pt_size = GNUNET_MIN(max,
			   p->data.dir.dir_size - offset);
      dd = p->data.dir.dir_data;
      memcpy (buf,
	      &dd[offset],
	      pt_size);
    }
  else
    {
      pt_size = GNUNET_MIN(max,
			   p->data.file.file_size - offset);
      if (pt_size == 0)
	return 0; /* calling reader with pt_size==0 
		     might free buf, so don't! */
      if (pt_size !=
	  p->data.file.reader (p->data.file.reader_cls,
			       offset,
			       pt_size,
			       buf,
			       emsg))
	return 0;
    }
  return pt_size;
}


/**
 * The tree encoder has finished processing a
 * file.   Call it's finish method and deal with
 * the final result.
 *
 * @param cls our publishing context
 * @param tc scheduler's task context (not used)
 */
static void 
encode_cont (void *cls,
	     const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct GNUNET_FS_PublishContext *sc = cls;
  struct GNUNET_FS_FileInformation *p;
  struct GNUNET_FS_ProgressInfo pi;
  char *emsg;
  
  p = sc->fi_pos;
  GNUNET_FS_tree_encoder_finish (p->te,
				 &p->chk_uri,
				 &emsg);
  p->te = NULL;
  if (NULL != emsg)
    {
      GNUNET_asprintf (&p->emsg, 
		       _("Upload failed: %s"),
		       emsg);
      GNUNET_free (emsg);
      pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
      pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
      pi.value.publish.specifics.error.message = p->emsg;
      p->client_info =  GNUNET_FS_publish_make_status_ (&pi, sc, p, 0);
    }
  /* continue with main */
  sc->upload_task 
    = GNUNET_SCHEDULER_add_with_priority (sc->h->sched,
					  GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
					  &GNUNET_FS_publish_main_,
					  sc);
}


/**
 * 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".
 *
 * @param cls closure
 * @param query the query for the block (key for lookup in the datastore)
 * @param offset offset of the block in the file
 * @param type type of the block (IBLOCK or DBLOCK)
 * @param block the (encrypted) block
 * @param block_size size of block (in bytes)
 */
static void 
block_proc (void *cls,
	    const GNUNET_HashCode *query,
	    uint64_t offset,
	    enum GNUNET_BLOCK_Type type,
	    const void *block,
	    uint16_t block_size)
{
  struct GNUNET_FS_PublishContext *sc = cls;
  struct GNUNET_FS_FileInformation *p;
  struct PutContCtx * dpc_cls;
  struct OnDemandBlock odb;

  p = sc->fi_pos;
  if (NULL == sc->dsh)
    {
      sc->upload_task
	= GNUNET_SCHEDULER_add_with_priority (sc->h->sched,
					      GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
					      &GNUNET_FS_publish_main_,
					      sc);
      return;
    }
  
  GNUNET_assert (GNUNET_NO == sc->in_network_wait);
  sc->in_network_wait = GNUNET_YES;
  dpc_cls = GNUNET_malloc(sizeof(struct PutContCtx));
  dpc_cls->cont = &GNUNET_FS_publish_main_;
  dpc_cls->cont_cls = sc;
  dpc_cls->sc = sc;
  dpc_cls->p = p;
  if ( (! p->is_directory) &&
       (GNUNET_YES == p->data.file.do_index) &&
       (type == GNUNET_BLOCK_TYPE_DBLOCK) )
    {
#if DEBUG_PUBLISH
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
		  "Indexing block `%s' for offset %llu with index size %u\n",
		  GNUNET_h2s (query),
		  (unsigned long long) offset,
		  sizeof (struct OnDemandBlock));
#endif
      odb.offset = GNUNET_htonll (offset);
      odb.file_id = p->data.file.file_id;
      GNUNET_DATASTORE_put (sc->dsh,
			    sc->rid,
			    query,
			    sizeof(struct OnDemandBlock),
			    &odb,
			    GNUNET_BLOCK_TYPE_ONDEMAND,
			    p->priority,
			    p->anonymity,
			    p->expirationTime,
			    -2, 1,
			    GNUNET_CONSTANTS_SERVICE_TIMEOUT,
			    &ds_put_cont,
			    dpc_cls);	  
      return;
    }
#if DEBUG_PUBLISH
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
	      "Publishing block `%s' for offset %llu with size %u\n",
	      GNUNET_h2s (query),
	      (unsigned long long) offset,
	      (unsigned int) block_size);
#endif
  GNUNET_DATASTORE_put (sc->dsh,
			sc->rid,
			query,
			block_size,
			block,
			type,
			p->priority,
			p->anonymity,
			p->expirationTime,
			-2, 1,
			GNUNET_CONSTANTS_SERVICE_TIMEOUT,
			&ds_put_cont,
			dpc_cls);
}


/**
 * Function called with information about our
 * progress in computing the tree encoding.
 *
 * @param cls closure
 * @param offset where are we in the file
 * @param pt_block plaintext of the currently processed block
 * @param pt_size size of pt_block
 * @param depth depth of the block in the tree
 */
static void 
progress_proc (void *cls,
	       uint64_t offset,
	       const void *pt_block,
	       size_t pt_size,
	       unsigned int depth)
{		       
  struct GNUNET_FS_PublishContext *sc = cls;
  struct GNUNET_FS_FileInformation *p;
  struct GNUNET_FS_ProgressInfo pi;

  p = sc->fi_pos;
  pi.status = GNUNET_FS_STATUS_PUBLISH_PROGRESS;
  pi.value.publish.specifics.progress.data = pt_block;
  pi.value.publish.specifics.progress.offset = offset;
  pi.value.publish.specifics.progress.data_len = pt_size;
  pi.value.publish.specifics.progress.depth = depth;
  p->client_info = GNUNET_FS_publish_make_status_ (&pi, sc, p, offset);
}


/**
 * We are uploading a file or directory; load (if necessary) the next
 * block into memory, encrypt it and send it to the FS service.  Then
 * continue with the main task.
 *
 * @param sc overall upload data
 */
static void
publish_content (struct GNUNET_FS_PublishContext *sc) 
{
  struct GNUNET_FS_FileInformation *p;
  char *emsg;
  struct GNUNET_FS_DirectoryBuilder *db;
  struct GNUNET_FS_FileInformation *dirpos;
  void *raw_data;
  uint64_t size;

  p = sc->fi_pos;
  GNUNET_assert (p != NULL);
  if (NULL == p->te)
    {
      if (p->is_directory)
	{
	  db = GNUNET_FS_directory_builder_create (p->meta);
	  dirpos = p->data.dir.entries;
	  while (NULL != dirpos)
	    {
	      if (dirpos->is_directory)
		{
		  raw_data = dirpos->data.dir.dir_data;
		  dirpos->data.dir.dir_data = NULL;
		}
	      else
		{
		  raw_data = NULL;
		  if ( (dirpos->data.file.file_size < MAX_INLINE_SIZE) &&
		       (dirpos->data.file.file_size > 0) )
		    {
		      raw_data = GNUNET_malloc (dirpos->data.file.file_size);
		      emsg = NULL;
		      if (dirpos->data.file.file_size !=
			  dirpos->data.file.reader (dirpos->data.file.reader_cls,
						    0,
						    dirpos->data.file.file_size,
						    raw_data,
						    &emsg))
			{
			  GNUNET_free_non_null (emsg);
			  GNUNET_free (raw_data);
			  raw_data = NULL;
			} 
		    }
		}
	      GNUNET_FS_directory_builder_add (db,
					       dirpos->chk_uri,
					       dirpos->meta,
					       raw_data);
	      GNUNET_free_non_null (raw_data);
	      dirpos = dirpos->next;
	    }
	  GNUNET_FS_directory_builder_finish (db,
					      &p->data.dir.dir_size,
					      &p->data.dir.dir_data);
	  GNUNET_FS_file_information_sync_ (p);
	}
      size = (p->is_directory) 
	? p->data.dir.dir_size 
	: p->data.file.file_size;
      p->te = GNUNET_FS_tree_encoder_create (sc->h,
					     size,
					     sc,
					     &block_reader,
					     &block_proc,
					     &progress_proc,
					     &encode_cont);

    }
  GNUNET_FS_tree_encoder_next (p->te);
}


/**
 * Process the response (or lack thereof) from
 * the "fs" service to our 'start index' request.
 *
 * @param cls closure (of type "struct GNUNET_FS_PublishContext*"_)
 * @param msg the response we got
 */
static void
process_index_start_response (void *cls,
			      const struct GNUNET_MessageHeader *msg)
{
  struct GNUNET_FS_PublishContext *sc = cls;
  struct GNUNET_FS_FileInformation *p;
  const char *emsg;
  uint16_t msize;

  GNUNET_CLIENT_disconnect (sc->client, GNUNET_NO);
  sc->client = NULL;
  p = sc->fi_pos;
  if (msg == NULL)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
		  _("Can not index file `%s': %s.  Will try to insert instead.\n"),
		  p->filename,
		  _("timeout on index-start request to `fs' service"));
      p->data.file.do_index = GNUNET_NO;
      GNUNET_FS_file_information_sync_ (p);
      publish_content (sc);
      return;
    }
  if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_FS_INDEX_START_OK)
    {
      msize = ntohs (msg->size);
      emsg = (const char *) &msg[1];
      if ( (msize <= sizeof (struct GNUNET_MessageHeader)) ||
	   (emsg[msize - sizeof(struct GNUNET_MessageHeader) - 1] != '\0') )
	emsg = gettext_noop ("unknown error");
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
		  _("Can not index file `%s': %s.  Will try to insert instead.\n"),
		  p->filename,
		  gettext (emsg));
      p->data.file.do_index = GNUNET_NO;
      GNUNET_FS_file_information_sync_ (p);
      publish_content (sc);
      return;
    }
  p->data.file.index_start_confirmed = GNUNET_YES;
  /* success! continue with indexing */
  GNUNET_FS_file_information_sync_ (p);
  publish_content (sc);
}


/**
 * Function called once the hash computation over an
 * indexed file has completed.
 *
 * @param cls closure, our publishing context
 * @param res resulting hash, NULL on error
 */
static void 
hash_for_index_cb (void *cls,
		   const GNUNET_HashCode *
		   res)
{
  struct GNUNET_FS_PublishContext *sc = cls;
  struct GNUNET_FS_FileInformation *p;
  struct IndexStartMessage *ism;
  size_t slen;
  struct GNUNET_CLIENT_Connection *client;
  uint32_t dev;
  uint64_t ino;
  char *fn;

  p = sc->fi_pos;
  if (NULL == res) 
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
		  _("Can not index file `%s': %s.  Will try to insert instead.\n"),
		  p->filename,
		  _("failed to compute hash"));
      p->data.file.do_index = GNUNET_NO;
      GNUNET_FS_file_information_sync_ (p);
      publish_content (sc);
      return;
    }
  if (GNUNET_YES == p->data.file.index_start_confirmed)
    {
      publish_content (sc);
      return;
    }
  fn = GNUNET_STRINGS_filename_expand (p->filename);
  slen = strlen (fn) + 1;
  if (slen > GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof(struct IndexStartMessage))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
		  _("Can not index file `%s': %s.  Will try to insert instead.\n"),
		  fn,
		  _("filename too long"));
      GNUNET_free (fn);
      p->data.file.do_index = GNUNET_NO;
      GNUNET_FS_file_information_sync_ (p);
      publish_content (sc);
      return;
    }
#if DEBUG_PUBLISH
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
	      "Hash of indexed file `%s' is `%s'\n",
	      p->data.file.filename,
	      GNUNET_h2s (res));
#endif
  client = GNUNET_CLIENT_connect (sc->h->sched,
				  "fs",
				  sc->h->cfg);
  if (NULL == client)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
		  _("Can not index file `%s': %s.  Will try to insert instead.\n"),
		  p->filename,
		  _("could not connect to `fs' service"));
      p->data.file.do_index = GNUNET_NO;
      publish_content (sc);
      GNUNET_free (fn);
      return;
    }
  if (p->data.file.have_hash != GNUNET_YES)
    {
      p->data.file.file_id = *res;
      p->data.file.have_hash = GNUNET_YES;
      GNUNET_FS_file_information_sync_ (p);
    }
  ism = GNUNET_malloc (sizeof(struct IndexStartMessage) +
		       slen);
  ism->header.size = htons(sizeof(struct IndexStartMessage) +
			   slen);
  ism->header.type = htons(GNUNET_MESSAGE_TYPE_FS_INDEX_START);
  if (GNUNET_OK ==
      GNUNET_DISK_file_get_identifiers (p->filename,
					&dev,
					&ino))
    {
      ism->device = htonl (dev);
      ism->inode = GNUNET_htonll(ino);
    }
  else
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
		  _("Failed to get file identifiers for `%s'\n"),
		  p->filename);
    }
  ism->file_id = *res;
  memcpy (&ism[1],
	  fn,
	  slen);
  GNUNET_free (fn);
  sc->client = client;
  GNUNET_break (GNUNET_YES ==
		GNUNET_CLIENT_transmit_and_get_response (client,
							 &ism->header,
							 GNUNET_TIME_UNIT_FOREVER_REL,
							 GNUNET_YES,
							 &process_index_start_response,
							 sc));
  GNUNET_free (ism);
}


/**
 * Main function that performs the upload.
 *
 * @param cls "struct GNUNET_FS_PublishContext" identifies the upload
 * @param tc task context
 */
void
GNUNET_FS_publish_main_ (void *cls,
			 const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct GNUNET_FS_PublishContext *pc = cls;
  struct GNUNET_FS_ProgressInfo pi;
  struct GNUNET_FS_FileInformation *p;
  char *fn;

  pc->upload_task = GNUNET_SCHEDULER_NO_TASK;  
  p = pc->fi_pos;
  if (NULL == p)
    {
      /* upload of entire hierarchy complete,
	 publish namespace entries */
      GNUNET_FS_publish_sync_ (pc);
      publish_sblock (pc);
      return;
    }
  /* find starting position */
  while ( (p->is_directory) &&
	  (NULL != p->data.dir.entries) &&
	  (NULL == p->emsg) &&
	  (NULL == p->data.dir.entries->chk_uri) )
    {
      p = p->data.dir.entries;
      pc->fi_pos = p;
      GNUNET_FS_publish_sync_ (pc);
    }
  /* abort on error */
  if (NULL != p->emsg)
    {
      /* error with current file, abort all
	 related files as well! */
      while (NULL != p->dir)
	{
	  fn = GNUNET_CONTAINER_meta_data_get_by_type (p->meta,
						       EXTRACTOR_METATYPE_FILENAME);
	  p = p->dir;
	  if (fn != NULL)
	    {
	      GNUNET_asprintf (&p->emsg, 
			       _("Recursive upload failed at `%s': %s"),
			       fn,
			       p->emsg);
	      GNUNET_free (fn);
	    }
	  else
	    {
	      GNUNET_asprintf (&p->emsg, 
			       _("Recursive upload failed: %s"),
			       p->emsg);	      
	    }
	  pi.status = GNUNET_FS_STATUS_PUBLISH_ERROR;
	  pi.value.publish.eta = GNUNET_TIME_UNIT_FOREVER_REL;
	  pi.value.publish.specifics.error.message = p->emsg;
	  p->client_info = GNUNET_FS_publish_make_status_ (&pi, pc, p, 0);
	}
      pc->all_done = GNUNET_YES;
      GNUNET_FS_publish_sync_ (pc);
      return;
    }
  /* handle completion */
  if (NULL != p->chk_uri)
    {
      GNUNET_FS_publish_sync_ (pc);
      /* upload of "p" complete, publish KBlocks! */
      if (p->keywords != NULL)
	{
	  GNUNET_FS_publish_ksk (pc->h,
				 p->keywords,
				 p->meta,
				 p->chk_uri,
				 p->expirationTime,
				 p->anonymity,
				 p->priority,
				 pc->options,
				 &publish_kblocks_cont,
				 pc);
	}
      else
	{
	  publish_kblocks_cont (pc,
				p->chk_uri,
				NULL);
	}
      return;
    }
  if ( (!p->is_directory) &&
       (p->data.file.do_index) )
    {
      if (NULL == p->filename)
	{
	  p->data.file.do_index = GNUNET_NO;
	  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
		      _("Can not index file `%s': %s.  Will try to insert instead.\n"),
		      "<no-name>",
		      _("needs to be an actual file"));
	  GNUNET_FS_file_information_sync_ (p);
	  publish_content (pc);
	  return;
	}      
      if (p->data.file.have_hash)
	{
	  hash_for_index_cb (pc,
			     &p->data.file.file_id);
	}
      else
	{
	  p->start_time = GNUNET_TIME_absolute_get ();
	  GNUNET_CRYPTO_hash_file (pc->h->sched,
				   GNUNET_SCHEDULER_PRIORITY_IDLE,
				   p->filename,
				   HASHING_BLOCKSIZE,
				   &hash_for_index_cb,
				   pc);
	}
      return;
    }
  publish_content (pc);
}


/**
 * Signal the FS's progress function that we are starting
 * an upload.
 *
 * @param cls closure (of type "struct GNUNET_FS_PublishContext*")
 * @param fi the entry in the publish-structure
 * @param length length of the file or directory
 * @param meta metadata for the file or directory (can be modified)
 * @param uri pointer to the keywords that will be used for this entry (can be modified)
 * @param anonymity pointer to selected anonymity level (can be modified)
 * @param priority pointer to selected priority (can be modified)
 * @param expirationTime pointer to selected expiration time (can be modified)
 * @param client_info pointer to client context set upon creation (can be modified)
 * @return GNUNET_OK to continue (always)
 */
static int
fip_signal_start(void *cls,
		 struct GNUNET_FS_FileInformation *fi,
		 uint64_t length,
		 struct GNUNET_CONTAINER_MetaData *meta,
		 struct GNUNET_FS_Uri **uri,
		 uint32_t *anonymity,
		 uint32_t *priority,
		 struct GNUNET_TIME_Absolute *expirationTime,
		 void **client_info)
{
  struct GNUNET_FS_PublishContext *sc = cls;
  struct GNUNET_FS_ProgressInfo pi;

  pi.status = GNUNET_FS_STATUS_PUBLISH_START;
  *client_info = GNUNET_FS_publish_make_status_ (&pi, sc, fi, 0);
  GNUNET_FS_file_information_sync_ (fi);
  return GNUNET_OK;
}


/**
 * Signal the FS's progress function that we are suspending
 * an upload.
 *
 * @param cls closure (of type "struct GNUNET_FS_PublishContext*")
 * @param fi the entry in the publish-structure
 * @param length length of the file or directory
 * @param meta metadata for the file or directory (can be modified)
 * @param uri pointer to the keywords that will be used for this entry (can be modified)
 * @param anonymity pointer to selected anonymity level (can be modified)
 * @param priority pointer to selected priority (can be modified)
 * @param expirationTime pointer to selected expiration time (can be modified)
 * @param client_info pointer to client context set upon creation (can be modified)
 * @return GNUNET_OK to continue (always)
 */
static int
fip_signal_suspend(void *cls,
		   struct GNUNET_FS_FileInformation *fi,
		   uint64_t length,
		   struct GNUNET_CONTAINER_MetaData *meta,
		   struct GNUNET_FS_Uri **uri,
		   uint32_t *anonymity,
		   uint32_t *priority,
		   struct GNUNET_TIME_Absolute *expirationTime,
		   void **client_info)
{
  struct GNUNET_FS_PublishContext*sc = cls;
  struct GNUNET_FS_ProgressInfo pi;
  uint64_t off;

  GNUNET_free_non_null (fi->serialization);
  fi->serialization = NULL;    
  off = (fi->chk_uri == NULL) ? 0 : length;
  pi.status = GNUNET_FS_STATUS_PUBLISH_SUSPEND;
  GNUNET_break (NULL == GNUNET_FS_publish_make_status_ (&pi, sc, fi, off));
  *client_info = NULL;
  return GNUNET_OK;
}


/**
 * Create SUSPEND event for the given publish operation
 * and then clean up our state (without stop signal).
 *
 * @param cls the 'struct GNUNET_FS_PublishContext' to signal for
 */
void
GNUNET_FS_publish_signal_suspend_ (void *cls)
{
  struct GNUNET_FS_PublishContext *pc = cls;

  if (GNUNET_SCHEDULER_NO_TASK != pc->upload_task)
    {
      GNUNET_SCHEDULER_cancel (pc->h->sched, pc->upload_task);
      pc->upload_task = GNUNET_SCHEDULER_NO_TASK;
    }
  GNUNET_FS_file_information_inspect (pc->fi,
				      &fip_signal_suspend,
				      pc);
  GNUNET_FS_end_top (pc->h, pc->top);
  publish_cleanup (pc);
}

/**
 * Publish a file or directory.
 *
 * @param h handle to the file sharing subsystem
 * @param fi information about the file or directory structure to publish
 * @param namespace namespace to publish the file in, NULL for no namespace
 * @param nid identifier to use for the publishd content in the namespace
 *        (can be NULL, must be NULL if namespace is NULL)
 * @param nuid update-identifier that will be used for future updates 
 *        (can be NULL, must be NULL if namespace or nid is NULL)
 * @param options options for the publication 
 * @return context that can be used to control the publish operation
 */
struct GNUNET_FS_PublishContext *
GNUNET_FS_publish_start (struct GNUNET_FS_Handle *h,
			 struct GNUNET_FS_FileInformation *fi,
			 struct GNUNET_FS_Namespace *namespace,
			 const char *nid,
			 const char *nuid,
			 enum GNUNET_FS_PublishOptions options)
{
  struct GNUNET_FS_PublishContext *ret;
  struct GNUNET_DATASTORE_Handle *dsh;

  if (0 == (options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY))
    {
      dsh = GNUNET_DATASTORE_connect (h->cfg,
				      h->sched);
      if (NULL == dsh)
	return NULL;
    }
  else
    {
      dsh = NULL;
    }
  ret = GNUNET_malloc (sizeof (struct GNUNET_FS_PublishContext));
  ret->dsh = dsh;
  ret->h = h;
  ret->fi = fi;
  ret->namespace = namespace;
  if (namespace != NULL)
    {
      namespace->rc++;
      GNUNET_assert (NULL != nid);
      ret->nid = GNUNET_strdup (nid);
      if (NULL != nuid)
	ret->nuid = GNUNET_strdup (nuid);
    }
  /* signal start */
  GNUNET_FS_file_information_inspect (ret->fi,
				      &fip_signal_start,
				      ret);
  ret->fi_pos = ret->fi;
  ret->top = GNUNET_FS_make_top (h, &GNUNET_FS_publish_signal_suspend_, ret);
  GNUNET_FS_publish_sync_ (ret);
  // FIXME: calculate space needed for "fi"
  // and reserve as first task (then trigger
  // "publish_main" from that continuation)!
  ret->upload_task 
    = GNUNET_SCHEDULER_add_with_priority (h->sched,
					  GNUNET_SCHEDULER_PRIORITY_BACKGROUND,
					  &GNUNET_FS_publish_main_,
					  ret);
  return ret;
}


/**
 * Signal the FS's progress function that we are stopping
 * an upload.
 *
 * @param cls closure (of type "struct GNUNET_FS_PublishContext*")
 * @param fi the entry in the publish-structure
 * @param length length of the file or directory
 * @param meta metadata for the file or directory (can be modified)
 * @param uri pointer to the keywords that will be used for this entry (can be modified)
 * @param anonymity pointer to selected anonymity level (can be modified)
 * @param priority pointer to selected priority (can be modified)
 * @param expirationTime pointer to selected expiration time (can be modified)
 * @param client_info pointer to client context set upon creation (can be modified)
 * @return GNUNET_OK to continue (always)
 */
static int
fip_signal_stop(void *cls,
		struct GNUNET_FS_FileInformation *fi,
		uint64_t length,
		struct GNUNET_CONTAINER_MetaData *meta,
		struct GNUNET_FS_Uri **uri,
		uint32_t *anonymity,
		uint32_t *priority,
		struct GNUNET_TIME_Absolute *expirationTime,
		void **client_info)
{
  struct GNUNET_FS_PublishContext*sc = cls;
  struct GNUNET_FS_ProgressInfo pi;
  uint64_t off;

  if (fi->serialization != NULL) 
    {
      GNUNET_FS_remove_sync_file_ (sc->h,
				   GNUNET_FS_SYNC_PATH_FILE_INFO,
				   fi->serialization);
      GNUNET_free (fi->serialization);
      fi->serialization = NULL;
    }
  off = (fi->chk_uri == NULL) ? 0 : length;
  pi.status = GNUNET_FS_STATUS_PUBLISH_STOPPED;
  GNUNET_break (NULL == GNUNET_FS_publish_make_status_ (&pi, sc, fi, off));
  *client_info = NULL;
  return GNUNET_OK;
}


/**
 * Stop an upload.  Will abort incomplete uploads (but 
 * not remove blocks that have already been publishd) or
 * simply clean up the state for completed uploads.
 * Must NOT be called from within the event callback!
 *
 * @param pc context for the upload to stop
 */
void 
GNUNET_FS_publish_stop (struct GNUNET_FS_PublishContext *pc)
{
  GNUNET_FS_end_top (pc->h, pc->top);
  if (GNUNET_SCHEDULER_NO_TASK != pc->upload_task)
    {
      GNUNET_SCHEDULER_cancel (pc->h->sched, pc->upload_task);
      pc->upload_task = GNUNET_SCHEDULER_NO_TASK;
    }
  if (pc->serialization != NULL) 
    {
      GNUNET_FS_remove_sync_file_ (pc->h, GNUNET_FS_SYNC_PATH_MASTER_PUBLISH, pc->serialization);
      GNUNET_free (pc->serialization);
      pc->serialization = NULL;
    }
  GNUNET_FS_file_information_inspect (pc->fi,
				      &fip_signal_stop,
				      pc);
  if (GNUNET_YES == pc->in_network_wait)
    {
      pc->in_network_wait = GNUNET_SYSERR;
      return;
    }
  publish_cleanup (pc);
}


/**
 * Context for the KSK publication.
 */
struct PublishKskContext
{

  /**
   * Keywords to use.
   */
  struct GNUNET_FS_Uri *ksk_uri;

  /**
   * Global FS context.
   */
  struct GNUNET_FS_Handle *h;

  /**
   * The master block that we are sending
   * (in plaintext), has "mdsize+slen" more
   * bytes than the struct would suggest.
   */
  struct KBlock *kb;

  /**
   * Buffer of the same size as "kb" for
   * the encrypted version.
   */ 
  struct KBlock *cpy;

  /**
   * Handle to the datastore, NULL if we are just
   * simulating.
   */
  struct GNUNET_DATASTORE_Handle *dsh;

  /**
   * Function to call once we're done.
   */
  GNUNET_FS_PublishContinuation cont;

  /**
   * Closure for cont.
   */ 
  void *cont_cls;

  /**
   * When should the KBlocks expire?
   */
  struct GNUNET_TIME_Absolute expirationTime;

  /**
   * Size of the serialized metadata.
   */
  ssize_t mdsize;

  /**
   * Size of the (CHK) URI as a string.
   */
  size_t slen;

  /**
   * Keyword that we are currently processing.
   */
  unsigned int i;

  /**
   * Anonymity level for the KBlocks.
   */
  uint32_t anonymity;

  /**
   * Priority for the KBlocks.
   */
  uint32_t priority;
};


/**
 * Continuation of "GNUNET_FS_publish_ksk" that performs
 * the actual publishing operation (iterating over all
 * of the keywords).
 *
 * @param cls closure of type "struct PublishKskContext*"
 * @param tc unused
 */
static void
publish_ksk_cont (void *cls,
		  const struct GNUNET_SCHEDULER_TaskContext *tc);


/**
 * Function called by the datastore API with
 * the result from the PUT request.
 *
 * @param cls closure of type "struct PublishKskContext*"
 * @param success GNUNET_OK on success
 * @param msg error message (or NULL)
 */
static void
kb_put_cont (void *cls,
	     int success,
 	     const char *msg)
{
  struct PublishKskContext *pkc = cls;

  if (GNUNET_OK != success)
    {
      GNUNET_DATASTORE_disconnect (pkc->dsh, GNUNET_NO);
      GNUNET_free (pkc->cpy);
      GNUNET_free (pkc->kb);
      pkc->cont (pkc->cont_cls,
		 NULL,
		 msg);
      GNUNET_FS_uri_destroy (pkc->ksk_uri);
      GNUNET_free (pkc);
      return;
    }
  GNUNET_SCHEDULER_add_continuation (pkc->h->sched,
				     &publish_ksk_cont,
				     pkc,
				     GNUNET_SCHEDULER_REASON_PREREQ_DONE);
}


/**
 * Continuation of "GNUNET_FS_publish_ksk" that performs the actual
 * publishing operation (iterating over all of the keywords).
 *
 * @param cls closure of type "struct PublishKskContext*"
 * @param tc unused
 */
static void
publish_ksk_cont (void *cls,
		  const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct PublishKskContext *pkc = cls;
  const char *keyword;
  GNUNET_HashCode key;
  GNUNET_HashCode query;
  struct GNUNET_CRYPTO_AesSessionKey skey;
  struct GNUNET_CRYPTO_AesInitializationVector iv;
  struct GNUNET_CRYPTO_RsaPrivateKey *pk;


  if ( (pkc->i == pkc->ksk_uri->data.ksk.keywordCount) ||
       (NULL == pkc->dsh) )
    {
      if (NULL != pkc->dsh)
	GNUNET_DATASTORE_disconnect (pkc->dsh, GNUNET_NO);
      GNUNET_free (pkc->cpy);
      GNUNET_free (pkc->kb);
      pkc->cont (pkc->cont_cls,
		 pkc->ksk_uri,
		 NULL);
      GNUNET_FS_uri_destroy (pkc->ksk_uri);
      GNUNET_free (pkc);
      return;
    }
  keyword = pkc->ksk_uri->data.ksk.keywords[pkc->i++];
  /* first character of keyword indicates if it is
     mandatory or not -- ignore for hashing */
  GNUNET_CRYPTO_hash (&keyword[1], strlen (&keyword[1]), &key);
  GNUNET_CRYPTO_hash_to_aes_key (&key, &skey, &iv);
  GNUNET_CRYPTO_aes_encrypt (&pkc->kb[1],
			     pkc->slen + pkc->mdsize,
			     &skey,
			     &iv,
			     &pkc->cpy[1]);
  pk = GNUNET_CRYPTO_rsa_key_create_from_hash (&key);
  GNUNET_CRYPTO_rsa_key_get_public (pk, &pkc->cpy->keyspace);
  GNUNET_CRYPTO_hash (&pkc->cpy->keyspace,
		      sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
		      &query);
  GNUNET_assert (GNUNET_OK == 
		 GNUNET_CRYPTO_rsa_sign (pk,
					 &pkc->cpy->purpose,
					 &pkc->cpy->signature));
  GNUNET_CRYPTO_rsa_key_free (pk);
  GNUNET_DATASTORE_put (pkc->dsh,
			0,
			&query,
			pkc->mdsize + 
			sizeof (struct KBlock) + 
			pkc->slen,
			pkc->cpy,
			GNUNET_BLOCK_TYPE_KBLOCK, 
			pkc->priority,
			pkc->anonymity,
			pkc->expirationTime,
			-2, 1,
			GNUNET_CONSTANTS_SERVICE_TIMEOUT,
			&kb_put_cont,
			pkc);
}


/**
 * Publish a CHK under various keywords on GNUnet.
 *
 * @param h handle to the file sharing subsystem
 * @param ksk_uri keywords to use
 * @param meta metadata to use
 * @param uri URI to refer to in the KBlock
 * @param expirationTime when the KBlock expires
 * @param anonymity anonymity level for the KBlock
 * @param priority priority for the KBlock
 * @param options publication options
 * @param cont continuation
 * @param cont_cls closure for cont
 */
void
GNUNET_FS_publish_ksk (struct GNUNET_FS_Handle *h,
		       const struct GNUNET_FS_Uri *ksk_uri,
		       const struct GNUNET_CONTAINER_MetaData *meta,
		       const struct GNUNET_FS_Uri *uri,
		       struct GNUNET_TIME_Absolute expirationTime,
		       uint32_t anonymity,
		       uint32_t priority,
		       enum GNUNET_FS_PublishOptions options,
		       GNUNET_FS_PublishContinuation cont,
		       void *cont_cls)
{
  struct PublishKskContext *pkc;
  char *uris;
  size_t size;
  char *kbe;
  char *sptr;

  pkc = GNUNET_malloc (sizeof (struct PublishKskContext));
  pkc->h = h;
  pkc->expirationTime = expirationTime;
  pkc->anonymity = anonymity;
  pkc->priority = priority;
  pkc->cont = cont;
  pkc->cont_cls = cont_cls;
  if (0 == (options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY))
    {
      pkc->dsh = GNUNET_DATASTORE_connect (h->cfg,
					   h->sched);
      if (pkc->dsh == NULL)
	{
	  cont (cont_cls, NULL, _("Could not connect to datastore."));
	  GNUNET_free (pkc);
	  return;
	}
    }
  if (meta == NULL)
    pkc->mdsize = 0;
  else
    pkc->mdsize = GNUNET_CONTAINER_meta_data_get_serialized_size (meta);
  GNUNET_assert (pkc->mdsize >= 0);
  uris = GNUNET_FS_uri_to_string (uri);
  pkc->slen = strlen (uris) + 1;
  size = pkc->mdsize + sizeof (struct KBlock) + pkc->slen;
  if (size > MAX_KBLOCK_SIZE)
    {
      size = MAX_KBLOCK_SIZE;
      pkc->mdsize = size - sizeof (struct KBlock) - pkc->slen;
    }
  pkc->kb = GNUNET_malloc (size);
  kbe = (char *) &pkc->kb[1];
  memcpy (kbe, uris, pkc->slen);
  GNUNET_free (uris);
  sptr = &kbe[pkc->slen];
  if (meta != NULL)
    pkc->mdsize = GNUNET_CONTAINER_meta_data_serialize (meta,
							&sptr,
							pkc->mdsize,
							GNUNET_CONTAINER_META_DATA_SERIALIZE_PART);
  if (pkc->mdsize == -1)
    {
      GNUNET_break (0);
      GNUNET_free (pkc->kb);
      if (pkc->dsh != NULL)
	GNUNET_DATASTORE_disconnect (pkc->dsh, GNUNET_NO);
      cont (cont_cls, NULL, _("Internal error."));
      GNUNET_free (pkc);
      return;
    }
  size = sizeof (struct KBlock) + pkc->slen + pkc->mdsize;

  pkc->cpy = GNUNET_malloc (size);
  pkc->cpy->purpose.size = htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) + 
				  sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
				  pkc->mdsize + 
				  pkc->slen);
  pkc->cpy->purpose.purpose = htonl(GNUNET_SIGNATURE_PURPOSE_FS_KBLOCK);
  pkc->ksk_uri = GNUNET_FS_uri_dup (ksk_uri);
  GNUNET_SCHEDULER_add_continuation (h->sched,
				     &publish_ksk_cont,
				     pkc,
				     GNUNET_SCHEDULER_REASON_PREREQ_DONE);
}


/**
 * Context for the SKS publication.
 */
struct PublishSksContext
{

  /**
   * Global FS context.
   */
  struct GNUNET_FS_Uri *uri;

  /**
   * Handle to the datastore.
   */
  struct GNUNET_DATASTORE_Handle *dsh;

  /**
   * Function to call once we're done.
   */
  GNUNET_FS_PublishContinuation cont;

  /**
   * Closure for cont.
   */ 
  void *cont_cls;

};


/**
 * Function called by the datastore API with
 * the result from the PUT (SBlock) request.
 *
 * @param cls closure of type "struct PublishSksContext*"
 * @param success GNUNET_OK on success
 * @param msg error message (or NULL)
 */
static void
sb_put_cont (void *cls,
	     int success,
 	     const char *msg)
{
  struct PublishSksContext *psc = cls;

  if (NULL != psc->dsh)
    GNUNET_DATASTORE_disconnect (psc->dsh, GNUNET_NO);
  if (GNUNET_OK != success)
    psc->cont (psc->cont_cls,
	       NULL,
	       msg);
  else
    psc->cont (psc->cont_cls,
	       psc->uri,
	       NULL);
  GNUNET_FS_uri_destroy (psc->uri);
  GNUNET_free (psc);
}


/**
 * Publish an SBlock on GNUnet.
 *
 * @param h handle to the file sharing subsystem
 * @param namespace namespace to publish in
 * @param identifier identifier to use
 * @param update update identifier to use
 * @param meta metadata to use
 * @param uri URI to refer to in the SBlock
 * @param expirationTime when the SBlock expires
 * @param anonymity anonymity level for the SBlock
 * @param priority priority for the SBlock
 * @param options publication options
 * @param cont continuation
 * @param cont_cls closure for cont
 */
void
GNUNET_FS_publish_sks (struct GNUNET_FS_Handle *h,
		       struct GNUNET_FS_Namespace *namespace,
		       const char *identifier,
		       const char *update,
		       const struct GNUNET_CONTAINER_MetaData *meta,
		       const struct GNUNET_FS_Uri *uri,
		       struct GNUNET_TIME_Absolute expirationTime,
		       uint32_t anonymity,
		       uint32_t priority,
		       enum GNUNET_FS_PublishOptions options,
		       GNUNET_FS_PublishContinuation cont,
		       void *cont_cls)
{
  struct PublishSksContext *psc;
  struct GNUNET_CRYPTO_AesSessionKey sk;
  struct GNUNET_CRYPTO_AesInitializationVector iv;
  struct GNUNET_FS_Uri *sks_uri;
  char *uris;
  size_t size;
  size_t slen;
  size_t nidlen;
  size_t idlen;
  ssize_t mdsize;
  struct SBlock *sb;
  struct SBlock *sb_enc;
  char *dest;
  struct GNUNET_CONTAINER_MetaData *mmeta;
  GNUNET_HashCode key;         /* hash of thisId = key */
  GNUNET_HashCode id;          /* hash of hc = identifier */
  GNUNET_HashCode query;       /* id ^ nsid = DB query */

  if (NULL == meta)
    mmeta = GNUNET_CONTAINER_meta_data_create ();
  else
    mmeta = GNUNET_CONTAINER_meta_data_duplicate (meta);
  uris = GNUNET_FS_uri_to_string (uri);
  slen = strlen (uris) + 1;
  idlen = strlen (identifier);
  if (update == NULL)
    update = "";
  nidlen = strlen (update) + 1;
  mdsize = GNUNET_CONTAINER_meta_data_get_serialized_size (mmeta);
  size = sizeof (struct SBlock) + slen + nidlen + mdsize;
  if (size > MAX_SBLOCK_SIZE)
    {
      size = MAX_SBLOCK_SIZE;
      mdsize = size - (sizeof (struct SBlock) + slen + nidlen);
    }
  sb = GNUNET_malloc (sizeof (struct SBlock) + size);
  dest = (char *) &sb[1];
  memcpy (dest, update, nidlen);
  dest += nidlen;
  memcpy (dest, uris, slen);
  GNUNET_free (uris);
  dest += slen;
  mdsize = GNUNET_CONTAINER_meta_data_serialize (mmeta,
						 &dest,
						 mdsize, 
						 GNUNET_CONTAINER_META_DATA_SERIALIZE_PART);
  GNUNET_CONTAINER_meta_data_destroy (mmeta);
  if (mdsize == -1)
    {
      GNUNET_break (0);
      GNUNET_free (sb);
      cont (cont_cls,
	    NULL,
	    _("Internal error."));
      return;
    }
  size = sizeof (struct SBlock) + mdsize + slen + nidlen;
  sb_enc = GNUNET_malloc (size);
  GNUNET_CRYPTO_hash (identifier, idlen, &key);
  GNUNET_CRYPTO_hash (&key, sizeof (GNUNET_HashCode), &id);
  sks_uri = GNUNET_malloc (sizeof (struct GNUNET_FS_Uri));
  sks_uri->type = sks;
  GNUNET_CRYPTO_rsa_key_get_public (namespace->key, &sb_enc->subspace);
  GNUNET_CRYPTO_hash (&sb_enc->subspace,
		      sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
		      &sks_uri->data.sks.namespace);
  sks_uri->data.sks.identifier = GNUNET_strdup (identifier);
  GNUNET_CRYPTO_hash_xor (&id, 
			  &sks_uri->data.sks.namespace, 
			  &sb_enc->identifier);
  GNUNET_CRYPTO_hash_to_aes_key (&key, &sk, &iv);
  GNUNET_CRYPTO_aes_encrypt (&sb[1],
			     size - sizeof (struct SBlock),
			     &sk,
			     &iv,
			     &sb_enc[1]);
  sb_enc->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_FS_SBLOCK);
  sb_enc->purpose.size = htonl(slen + mdsize + nidlen
			       + sizeof(struct SBlock)
			       - sizeof(struct GNUNET_CRYPTO_RsaSignature));
  GNUNET_assert (GNUNET_OK == 
		 GNUNET_CRYPTO_rsa_sign (namespace->key,
					 &sb_enc->purpose,
					 &sb_enc->signature));
  psc = GNUNET_malloc (sizeof(struct PublishSksContext));
  psc->uri = sks_uri;
  psc->cont = cont;
  psc->cont_cls = cont_cls;
  if (0 != (options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY))
    {
      GNUNET_free (sb_enc);
      GNUNET_free (sb);
      sb_put_cont (psc,
		   GNUNET_OK,
		   NULL);
      return;
    }
  psc->dsh = GNUNET_DATASTORE_connect (h->cfg, h->sched);
  if (NULL == psc->dsh)
    {
      GNUNET_free (sb_enc);
      GNUNET_free (sb);
      sb_put_cont (psc,
		   GNUNET_NO,
		   _("Failed to connect to datastore."));
      return;
    }
  GNUNET_CRYPTO_hash_xor (&sks_uri->data.sks.namespace,
			  &id,
			  &query);  
  GNUNET_DATASTORE_put (psc->dsh,
			0,
			&sb_enc->identifier,
			size,
			sb_enc,
			GNUNET_BLOCK_TYPE_SBLOCK, 
			priority,
			anonymity,
			expirationTime,
			-2, 1,
			GNUNET_CONSTANTS_SERVICE_TIMEOUT,
			&sb_put_cont,
			psc);

  GNUNET_free (sb);
  GNUNET_free (sb_enc);
}

/* end of fs_publish.c */