forked from oe5hpm/openBCM
-
Notifications
You must be signed in to change notification settings - Fork 0
/
didadit.cpp
1228 lines (1144 loc) · 37.4 KB
/
didadit.cpp
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
/***************************************************************
BayCom(R) Packet-Radio fuer IBM PC
OpenBCM-Mailbox
------------------------
DIDADIT-Protocol for BCM
------------------------
Copyright (C) Johann Hanne, DH3MB, [email protected]
Rot-Kreuz-Gasse 9
D-85072 Eichstaett
Alle Rechte vorbehalten / All Rights Reserved
DIDADIT is (c) 1409.org, see http://1409.org/projects/didadit/
***************************************************************/
//19990401 DH3MB Begin of implementation (SPEC V0.5.3)
//19990406 DH3MB Switched to SPEC V0.5.4
//19990416 DH3MB Switched to SPEC V0.5.5
//19990520 DH3MB Switched to SPEC V0.5.7
//20000312 DH3MB Switched to SPEC V0.9.1
//20000316 DH3MB Phew - transmission finally works somehow
//20000322 DH3MB Reception also works
// However, there are severel things to do
//20000711 DG4IAD Now ::usefile() is used to get the path
// to store in. fixed unstuffing
//20000712 DG4IAD Reverted to previous behaviour. Now ::usepath()
// sets the path. New methods getfilename,getsize
// for binmail.
//20000713 DK2UI added #define DEBUG_DIDADIT
//20020524 DK2UI added setfiletime
//20020927 DF3VI DGET Zugriffsrecht wie bei BGET
//20030708 DH8YMB Fixed MD5-Problem with RX
//20030710 DH8YMB CPS-Ausgabe bei erfolgreichem RX/TX
#include "baycom.h"
#ifdef FEATURE_DIDADIT
/*---------------------------------------------------------------------------*/
fileio_dida::fileio_dida (void) : fileio()
//*************************************************************************
//
//*************************************************************************
{
bl = (struct block_info *) t_malloc(sizeof(struct block_info), "dida");
bl->maxlen = 0;
f->requires = REQ_MD5HASH;
waitforheader = 1;
*sendname = 0;
}
/*---------------------------------------------------------------------------*/
fileio_dida::~fileio_dida (void) // TODO? : fileio::~fileio()
//*************************************************************************
//
//*************************************************************************
{
if (bl->maxlen > 0) free_blockmem();
t_free(bl);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::set_path (const char *path)
//*************************************************************************
//
//*************************************************************************
{
strcpy(f->path, path);
strcpy(f->fullname, "/dev/null");
}
/*---------------------------------------------------------------------------*/
void fileio_dida::set_waitforheader (int bo)
//*************************************************************************
//
//*************************************************************************
{
waitforheader = bo;
}
/*---------------------------------------------------------------------------*/
void fileio_dida::get_filename (char *name)
//*************************************************************************
//
//*************************************************************************
{
strcpy(name, f->name);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::set_sendname (const char *name)
//*************************************************************************
//
//*************************************************************************
{
strcpy(sendname, name);
}
/*---------------------------------------------------------------------------*/
unsigned long fileio_dida::get_size ()
//*************************************************************************
//
//*************************************************************************
{
// return (f->size);
return filesize(f->fullname);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_stuffed (char ch)
//*************************************************************************
//
//*************************************************************************
{
switch (ch)
{
case FEND: bputv(FESC); bputv(TFEND); break;
case FESC: bputv(FESC); bputv(TFESC); break;
default: bputv(ch); break;
}
}
/*---------------------------------------------------------------------------*/
char fileio_dida::rx_stuffed (void)
//*************************************************************************
//
//*************************************************************************
{
char ch = getv();
stuffresult = 0;
switch (ch)
{
case FEND: stuffresult = 1; return(0);
case FESC: ch = getv();
switch (ch)
{
case TFEND: return(FEND);
case TFESC: return(FESC);
default:
trace(serious, "debug", "unstuff, received FESC, then: %c", ch);
stuffresult = 2;
return(0);
}
default: return(ch);
}
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_block (unsigned short int type, char tx_md5hash,
char *data, unsigned long int length)
//*************************************************************************
//
//*************************************************************************
{
int i;
crcthp crc_;
bputv(FEND);
MD5 md5;
md5.readfile(f->fullname, f->offset);
md5.getdigest(f->md5hash);
#ifdef DEBUG_DIDADIT
// trace(report, "debug", "md5hash: %s", f->md5hash);
#endif
tx_stuffed(type % 256);
tx_stuffed(type / 256);
crc_.update(type % 256);
crc_.update(type / 256);
if (tx_md5hash)
for (i = 0; i < 16; i++)
{
tx_stuffed(f->md5hash[i]);
crc_.update(f->md5hash[i]);
}
while (length--)
{
tx_stuffed(*data);
crc_.update(*(data++));
}
tx_stuffed(crc_.result % 256);
tx_stuffed(crc_.result / 256);
bputv(FEND);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::rx_block ()
//*************************************************************************
//
// Empfängt ein DIDADIT-Frame; es wird dabei solange empfangen, bis
// ein korrektes Frame angekommen ist; alle ungültigen Frames werden
// einfach verworfen (egal, ob es sich um einen CRC-Fehler handelt,
// das Frame zu lang war, etc.).
//
// An das letzte empfange Byte in data wird ein 0-Byte angehängt, was
// für die Auswertung von Text-Blöcken ganz nützlich ist.
//
//*************************************************************************
{
char rxstate;
char typelen; // Number of type-bytes already received
int md5len; // Number of md5hash-bytes already received
unsigned short int datalen; // Number of data-bytes already received
char ch;
crcthp crc_;
char crcbuf[2]; // Die CRC wird um 2 Bytes verzögert mitgerechnet, um
// die empfangene CRC selbst nicht miteinzuberechnen
if (! bl->maxlen)
{
trace(serious, "rx didadit block", "no mem allocated");
return;
}
for (;;)
{
rxstate = R_RX_STATE_TYPE;
typelen = 0;
md5len = 0;
datalen = 0;
crc_.result = 0; // TODO: Make crc_.reset() method
for (ch = rx_stuffed(); stuffresult != 1; ch = rx_stuffed())
{
if (stuffresult == 2)
{ // Received an invalid ESCape-sequence
rxstate = R_RX_STATE_INVALID;
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "***1");
#endif
}
// Wenn die Typ-ID (zwei Bytes) vollständig empfangen wurde, kann mit
// der Berechnung der CRC begonnen werden
if (typelen == 2) crc_.update(*crcbuf);
crcbuf[0] = crcbuf[1];
crcbuf[1] = ch;
switch (rxstate)
{
case R_RX_STATE_TYPE:
if (typelen == 0) *((char *) &bl->type) = ch; // Received first type-byte
else // Received second type-byte
{
*(((char *) &bl->type) + 1) = ch;
// Frame-types which include a md5-hash:
if ( bl->type == R_BLOCK_ERR
|| bl->type == R_BLOCK_DATA
|| bl->type == R_BLOCK_REQ
|| bl->type == R_BLOCK_FIN
|| bl->type == R_BLOCK_FINACK
|| bl->type == R_BLOCK_ABORT)
rxstate = R_RX_STATE_MD5HASH;
else
rxstate = R_RX_STATE_DATA;
}
typelen++;
break;
case R_RX_STATE_MD5HASH:
bl->md5hash[md5len] = ch;
#ifdef DEBUG_DIDADIT
// trace(report, "debug", "state %c", bl->md5hash[md5len]);
#endif
if (++md5len == 16) rxstate = R_RX_STATE_DATA;
break;
case R_RX_STATE_DATA:
bl->data[datalen++] = ch;
if (datalen > (bl->maxlen + 2)) rxstate = R_RX_STATE_INVALID;
break;
case R_RX_STATE_INVALID:
// Frame is already known to be invalid, do nothing
break;
}
}
// Frame not complete?
if (! (rxstate == R_RX_STATE_DATA && datalen >= 2))
{
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "***2");
#endif
continue;
}
// Check the CRC (stored in the last two bytes of the frame)
datalen -= 2;
if (*(unsigned short int*) (bl->data + datalen) == crc_.result)
{ // CRC ok
bl->data[datalen] = 0;
break;
}
else
{
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "***3");
#endif
waitfor(e_ticsfull);
}
}
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "rx block ended");
#endif
bl->len = datalen;
}
/*---------------------------------------------------------------------------*/
void fileio_dida::alloc_blockmem (unsigned short int size)
//*************************************************************************
//
// Allocates memory for receiving a DIDADIT block
//
// rx_block checks, if the allocated memory for the block is sufficient
// if not, the received block is silently ignored
//
//*************************************************************************
{
if (bl->maxlen > 0) free_blockmem();
bl->data = (char *) t_malloc(size + 2, "dida");
bl->maxlen = size;
}
/*---------------------------------------------------------------------------*/
void fileio_dida::free_blockmem ()
//*************************************************************************
//
// Frees memory allocated with alloc_blockmem()
//
//*************************************************************************
{
t_free(bl->data);
bl->maxlen = 0;
}
/*---------------------------------------------------------------------------*/
char *fileio_dida::parse_textblock (char *block, char **id, char **value)
//*************************************************************************
//
// Wird zum parsen eines DIDADIT-Text-Blocks (INFO, START)
// verwendet, das Informationen in der Form "ID=Wert\r" enthält
// Es werden das "=" und das "\r" (=CR) durch ein 0-Byte ersetzt
// *id wird auf den Anfang der ID gesetzt, *value auf den Anfang
// des Werts
// Zurückgegeben wird ein Pointer auf das nächste Feld oder NULL,
// wenn kein Feld gefunden wurde
//
// Wichtig: Der gesamte Block muß mit einem 0-Byte abgeschlossen sein,
// außerdem wird der übergebene Block verändert!
//
//*************************************************************************
{
char *equal, *end;
if ((equal = strchr(block, '=')) != 0 && (end = strchr (block, CR)) != 0)
{
*equal = 0;
*end = 0;
*id = block;
*value = equal + 1;
return(end + 1);
}
else return(0);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::parse_INFO (char *md5str, unsigned short int *rxed_blocksize)
//*************************************************************************
//
//
//
//*************************************************************************
{
char *block = bl->data, *id, *value;
*f->fullname = 0;
*f->name = 0;
// *f->path = 0;
f->size = 0L;
*md5str = 0;
f->unixtime = 0L;
*rxed_blocksize = 0;
*partner_ver = 0;
while ((block = parse_textblock(block, &id, &value)) != NULL)
{
if (! strcasecmp(id, "FILENAME"))
{
strncpy(f->fullname, value, FSPATHLEN + FNAMELEN);
f->fullname[FSPATHLEN + FNAMELEN] = 0;
}
// else if (! strcasecmp(id, "PATH"))
// {
// strncpy(f->path, value, FSPATHLEN);
// f->path[FSPATHLEN] = 0;
// }
else if (! strcasecmp(id, "SIZE")) f->size = atol(value);
else if (! strcasecmp(id, "MD5"))
{
strncpy(md5str, value, 32);
md5str[32] = 0;
}
else if (! strcasecmp(id, "TIME")) f->unixtime = atol(value);
else if (! strcasecmp(id, "BLOCKSIZE")) *rxed_blocksize = atoi(value);
else if (! strcasecmp(id, "VERSION"))
{
strncpy(partner_ver, value, 9);
partner_ver[9] = 0;
}
}
}
/*---------------------------------------------------------------------------*/
void fileio_dida::parse_START (unsigned long int *resume_offset,
char *part_md5str,
unsigned short int *rxed_blocksize)
//*************************************************************************
//
//
//
//*************************************************************************
{
char *block = bl->data, *id, *value;
*resume_offset = 0L;
*part_md5str = 0;
*rxed_blocksize = 0;
*partner_ver = 0;
while ((block = parse_textblock(block, &id, &value)) != NULL)
{
if (! strcasecmp(id, "OFFSET")) *resume_offset = atol(value);
else if (! strcasecmp(id, "PART_MD5"))
{
strncpy(part_md5str, value, 32);
part_md5str[32] = 0;
}
else if (! strcasecmp(id, "BLOCKSIZE")) *rxed_blocksize = atoi(value);
else if (! strcasecmp(id, "VERSION"))
{
strncpy(partner_ver, value, 9);
partner_ver[9] = 0;
}
}
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_INFO()
//*************************************************************************
//
//*************************************************************************
{
#ifdef DEBUG_DIDADIT
trace(serious, "tx_INFO", "s:%s, p:%s, n:%s,", sendname, f->path, f->name);
#endif
// TODO: overrun check
if (! *sendname) strcpy(sendname, f->name);
sprintf(b->line,
"FILENAME=%s\r"
"PATH=%s\r"
"SIZE=%ld\r"
"MD5=%s\r"
"TIME=%ld\r"
"BLOCKSIZE=%d\r"
"VERSION=" DIDADIT_VERSION "\r",
sendname, f->path, f->size, f->md5str,
f->unixtime, DEFAULT_BLOCKSIZE);
tx_block(R_BLOCK_INFO, 0, b->line, strlen(b->line));
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_START (unsigned long int offset, char *part_md5str,
unsigned short int blcksize)
//*************************************************************************
//
//*************************************************************************
{
sprintf(b->line, "OFFSET=%ld\r", offset);
/* dh8ymb: in der Variablen is nur Schrott, daher erstmal weglassen
if (offset > 0)
sprintf(b->line + strlen(b->line), "PART_MD5=%s\r", part_md5str);
*/
if (blcksize)
sprintf(b->line + strlen(b->line), "BLOCKSIZE=%d\r", blcksize);
sprintf(b->line + strlen(b->line), "VERSION=" DIDADIT_VERSION "\r");
tx_block(R_BLOCK_START, 0, b->line, strlen(b->line));
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_ERR (char *errorinfo)
//*************************************************************************
//
//*************************************************************************
{
tx_block(R_BLOCK_ERR, 1, b->line, strlen(b->line));
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_DATA (unsigned long int offset,
unsigned short int length, char *data)
//*************************************************************************
//
//*************************************************************************
{
char *datptr = (char *) t_malloc(length + 6, "dida");
memcpy(datptr, &offset, 4);
memcpy(datptr + 4, &length, 2);
memcpy(datptr + 6, data, length);
tx_block(R_BLOCK_DATA, 1, datptr, length + 6);
t_free(datptr);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_REQ (struct REQ_info *REQ, unsigned long int len)
//*************************************************************************
//
//*************************************************************************
{
tx_block(R_BLOCK_REQ, 1, (char *) REQ, len * sizeof(struct REQ_info));
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_FIN (char *data)
//*************************************************************************
//
//*************************************************************************
{
tx_block(R_BLOCK_FIN, 1, 0, 0);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_FINACK (void)
//*************************************************************************
//
//*************************************************************************
{
tx_block(R_BLOCK_FINACK, 1, 0, 0);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_ECHOREQ (void)
//*************************************************************************
//
//*************************************************************************
{
tx_block(R_BLOCK_ECHOREQ, 0, 0, 0);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_ECHOREP (void)
//*************************************************************************
//
//*************************************************************************
{
tx_block(R_BLOCK_ECHOREP, 0, 0, 0);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_ABORT (void)
//*************************************************************************
//
//*************************************************************************
{
tx_block(R_BLOCK_ABORT, 1, 0, 0);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::update_r_file (char *r_filename, char *md5str,
unsigned long int REQc, struct REQ_info *REQ)
//*************************************************************************
//
//*************************************************************************
{
int fh;
if (! REQc)
{
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "unlinking rfile");
#endif
xunlink(r_filename);
return;
}
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "update rfile: %d REQs", REQc);
#endif
fh = s_open(r_filename, "swb");
// Write the first 32 bytes of the file (the MD5 hex string)
write(fh, md5str, 32);
// Write a LF
write(fh, "\012", 1);
// Read the list of the parts which we are missing due to invalid
// DATA frames during the reception of the first part
write(fh, REQ, REQc*8);
s_close(fh);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::send_file_data (unsigned long int startbyte,
unsigned long int length,
unsigned long int blcksize)
//*************************************************************************
//
//*************************************************************************
{
char *buf = (char *) t_malloc(blcksize, "dida");
unsigned long int rbytes; // Bytes to be read
unsigned long int rnum; // Bytes successfully read
f->pos = startbyte;
lseek(f->handle, f->offset + startbyte, SEEK_SET);
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "start at %d, total len %d", startbyte, length);
#endif
do
{
rbytes = blcksize;
if (rbytes > length) rbytes = length;
if ((rnum = read(f->handle, buf, rbytes)) != 0)
{
tx_DATA(f->pos, (unsigned short) rnum, buf);
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "offset: %ld, len: %ld", f->pos, rnum);
#endif
f->pos += rnum;
length -= rnum;
waitfor(e_ticsfull);
// TODO: Ueberpruefen, ob inzwischen etwas empfangen wurde
}
}
while (length && rnum);
t_free(buf);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::_rx(void)
//*************************************************************************
//
// Empfangen von DIDADIT
//
//*************************************************************************
{
char md5str[33];
unsigned short int rxed_blocksize;
char *data_start = NULL;
long int rxed_offset;
unsigned short int rxed_len; // TODO: Auswerten!
struct REQ_info *REQ = 0;
unsigned long int REQc = 0, c;
char found;
unsigned long int resume_offset;
unsigned long int bps;
time_t startt = ad_time(), rxtime;
char r_filename[FSPATHLEN * 2 + FNAMELEN + 3];
char r_filemd5str[33];
char r_filehandle;
char *cp;
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "in fileio_dida::_rx");
#endif
if (waitforheader)
{
putf(ms(m_filewaiting), "DIDADIT", "");
do
getline(b->line, sizeof(b->line) - 1, 1);
while (! *b->line); // ignore empty lines
if (strcmp(b->line, "#DIDADIT#"))
{
putf(ms(m_filenotstored));
return;
}
}
putf("\n#OK#\n");
putflush();
alloc_blockmem(DEFAULT_BLOCKSIZE); // TODO: 1000 bytes max.?
// We now expect an INFO-frame
rx_block();
if (bl->type != R_BLOCK_INFO)
{
tx_ABORT();
putf("*** Expected INFO-Frame, got 0x%04X.\n", bl->type);
return;
}
parse_INFO(md5str, &rxed_blocksize);
/*
printf("FILENAME: %s\n"
"PATH: %s\n"
"SIZE: %ld\n"
"MD5: %s\n"
"TIME: %ld\n"
"BLOCKSIZE: %d\n"
"VERSION: %s\n",
f->name, f->path, f->size, md5str, f->unixtime, rxed_blocksize,
partner_ver);
*/
if ((cp = strrchr(f->fullname, '/')) != NULL)
strcpy(f->fullname, cp + 1);
if (*f->path && f->path[strlen(f->path) - 1] != '/')
strcat(f->path, "/");
strcpy(r_filename, f->path);
strcat(r_filename, f->fullname);
time_t modtime = f->unixtime;
usefile(r_filename); // this deletes f->unixtime
f->unixtime = modtime;
// usefile (r_filename);
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "p:%s, n:%s, f:%s, s:%ld", f->path, f->name,
f->fullname, f->size);
#endif
strcpy(r_filename, f->fullname);
strcat(r_filename, ".r");
// If the file already exists, we will resume the transfer
if (filetime(f->fullname))
{
// Look for "filename.extension.r": this file contains information
// about missing parts of the file and the MD5 hash (only exists
// if some of the DATA blocks during the reception of the
// first part have been invalid)
if (filetime(r_filename))
{ // Ok, the index file exists: We will read it's contents and
// check if the MD5 hash is still the same
// TODO: Check, if the length of r_filename is valid!
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "found index file");
#endif
REQc = (filesize(r_filename) - 33) / 8;
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "REQc: %d", REQc);
#endif
REQ = (struct REQ_info *) t_malloc(sizeof(struct REQ_info)
* ((REQc / 5) + 1) * 5, "dida");
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "reserved mem for %d REQ_infos",
((REQc / 5) + 1) * 5);
#endif
r_filehandle = s_open(r_filename, "srb");
// Read the first 32 bytes of the file (the MD5 hex string)
read(r_filehandle, r_filemd5str, 32);
// Skip the following LF
lseek(r_filehandle, 1L, SEEK_CUR);
// Read the list of the parts which we are missing due to invalid
// DATA frames during the reception of the first part
read(r_filehandle, REQ, REQc * 8);
s_close(r_filehandle);
}
else
{ // Nope, there's no index file containg information about gaps
// in the part of the while we have already received
// As we don't know the MD5 hash of the complete file we will
// send the MD5 hash of the part already received to the sender
// who will (hopefully) check if we are talking about the same file
// TODO
}
f->size = resume_offset = filesize(f->fullname);
}
else
{
resume_offset = 0;
//*r_filemd5str = 0;
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "no file to resume");
#endif
}
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "\nr_filemd5str: %s\nmd5str: %s",
r_filemd5str, md5str);
#endif
if (! REQ)
REQ = (struct REQ_info *) t_malloc(sizeof(struct REQ_info) * 5, "dida");
if (rxed_blocksize <= MAX_BLOCKSIZE) blocksize = rxed_blocksize;
else blocksize = MAX_BLOCKSIZE;
tx_START(resume_offset, r_filemd5str, blocksize);
putflush();
// TODO: Vor dem Überschreiben Warnung ausgeben...
f->handle = s_open(f->fullname, "lr+b");
if (resume_offset) lseek(f->handle, resume_offset, SEEK_SET);
alloc_blockmem(MAX_BLOCKSIZE + 6); // TODO
// alloc_blockmem(blocksize+6); // +4 bytes for the offset
// +2 bytes for the blocklength
f->pos = resume_offset;
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "filesize: %d", f->size);
trace(serious, "debug", "resuming at: %d", resume_offset);
#endif
for (;;)
{
rx_block();
waitfor(e_ticsfull);
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "didadit: type:%i", bl->type);
#endif
if (bl->type == R_BLOCK_DATA)
{ // TODO: the memcpy()s only work on Intel-like architectures...
memcpy((void *) &rxed_offset, bl->data, 4);
memcpy((void *) &rxed_len, bl->data+4, 2);
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "didadit: type:%i, offs:%i, len:%i",
bl->type, rxed_offset, rxed_len);
#endif
data_start = bl->data + 6;
}
else if (bl->type == R_BLOCK_FIN)
// If we have received a FIN block, we set rxed_offset to one
// byte after the last byte of the file - the next lines
// will check, if the filepointer also points to this
// position; if it doesn't, one or more blocks are missing at
// the end and we have to send a REQ-block for them
rxed_offset=f->size;
else break;
if (rxed_offset>f->pos)
{
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "didadit: rxed_offset: %i > f->pos: %i",
rxed_offset, f->pos);
#endif
// Grow the buffer for storing REQs by 5 units, if there ist not
// sufficient space left
if (REQc > 0 && ! (REQc % 5))
REQ = (struct REQ_info *) t_realloc(REQ, sizeof(struct REQ_info)
* (REQc + 5));
REQ[REQc].offset = f->pos;
REQ[REQc].len = rxed_offset - f->pos;
REQc++;
do
write(f->handle, "*", 1); // Fill the file with "*" (TODO: improve this)
while (++f->pos < rxed_offset);
update_r_file(r_filename, r_filemd5str, REQc, REQ);
}
else if (rxed_offset < f->pos)
{
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "ignoring data: offset %d, len %d",
rxed_offset, bl->len-6);
#endif
}
if (bl->type == R_BLOCK_FIN) break;
write(f->handle, data_start, bl->len-6);
f->pos += bl->len - 6;
waitfor(e_ticsfull);
}
switch (bl->type)
{
case R_BLOCK_FIN:
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "sending REQ");
#endif
while (REQc) // As long as we don't have received everything correct
{
tx_REQ(REQ, REQc);
putflush();
for (;;)
{
rx_block();
if (bl->type == R_BLOCK_FIN) break;
// TODO handle invalid block type
if (bl->type != R_BLOCK_DATA)
#ifdef DEBUG_DIDADIT // dh8ymb: correct? missing {} ????
trace(serious, "debug", "unknown block");
#endif
// TODO: the memcpy()s only work on Intel-like architectures...
memcpy((void *) &rxed_offset, bl->data, 4);
memcpy((void *) &rxed_len, bl->data+4, 2);
data_start = bl->data + 6;
// Find the block we just received in our REQ list
found = 0;
for (c = 0; c < REQc; c++)
if ( (rxed_offset >= (long) REQ[c].offset)
&& ((rxed_offset + rxed_len) <= (long) (REQ[c].offset + REQ[c].len)))
{
found = 1;
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "found block at %d, len %d in REQs",
rxed_offset, rxed_len);
trace(serious, "debug", "REQ at %d, len %d",
REQ[c].offset, REQ[c].len);
#endif
break;
}
if (found)
{
lseek(f->handle, rxed_offset, SEEK_SET);
write(f->handle, data_start, bl->len-6);
// Look, if this DATA block includes all the bytes we requested
// in a REQ block or it's just a part of one
if (rxed_offset == (long) REQ[c].offset)
{
if (rxed_len == REQ[c].len)
{ // Fine - The received data block exactly fits to one entry in
// our REQ list.
// => We will delete this REQ entry from the list and decrement
// the number of REQs.
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "situation 1");
#endif
REQc--;
memcpy(REQ+c, REQ + REQc, sizeof(struct REQ_info));
}
else
{ // Hmmm - The received data block fits to the beginning of an
// entry in our REQ list; however, it does not cover ALL of the
// data we are missing according to this REQ entry.
// => We only shorten the length of REQ entry.
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "situation 2");
#endif
REQ[c].offset += rxed_len;
REQ[c].len -= rxed_len;
}
}
else
{
if ((rxed_offset + rxed_len) == (long) (REQ[c].offset + REQ[c].len))
{ // Sigh - The received data block covers exactly the end
// of an entry in our REQ list.
// The handling of this situation is not that difficult
// anyway: => We just have to decrease the length of the
// REQ entry
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "situation 3");
#endif
REQ[c].len -= rxed_len;
}
else
{ // Damn! - This situation is weird! The received data block
// fits to an entry in our REQ list; however, it only supplies
// data, which is located in the middle of the block we
// are missing; the easy way would be to ignore the block,
// but the DIDADIT protocol is intended to only transfer
// data, which is really necessary and so we will go the
// difficult way: => We modify the yet existing entry and
// create a new one
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "situation 4");
#endif
// Grow the buffer for storing REQs by 5 units, if there ist not
// sufficient space left
if (REQc > 0 && ! (REQc % 5))
REQ = (struct REQ_info *) t_realloc(REQ, sizeof(struct REQ_info)
* (REQc + 5));
// First, create the new entry:
REQ[REQc].offset = rxed_offset + rxed_len;
REQ[REQc].len = (REQ[c].offset+REQ[c].len) - REQ[REQc].offset;
REQc++;
// Now, modify the existing entry:
REQ[c].len -= (rxed_len + REQ[REQc - 1].len);
}
}
update_r_file(r_filename, r_filemd5str, REQc, REQ);
}
else
{ // OOPS: Block not found in our REQs - TODO: abort transfer
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "NOT found block at %d, len %d in REQs",
rxed_offset, rxed_len);
#endif
}
}
}
s_close(f->handle);
tx_FINACK();
putflush();
rxtime = ad_time() - startt;
if (! rxtime) rxtime = 1L;
bps = f->size / rxtime;
putf("\n");
putf(ms(m_rxok), "DIDADIT", bps << 3);
putflush();
setfiletime(f->fullname, getdostime(f->unixtime));
break;
default:
s_close(f->handle);
tx_ABORT();