-
Notifications
You must be signed in to change notification settings - Fork 0
/
tftp_file.c
902 lines (852 loc) · 35.6 KB
/
tftp_file.c
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
/* hey emacs! -*- Mode: C; c-file-style: "k&r"; indent-tabs-mode: nil -*- */
/*
* tftp_file.c
* client side file operations. File receiving and sending.
*
* $Id: tftp_file.c,v 1.42 2004/02/13 03:16:09 jp Exp $
*
* Copyright (c) 2000 Jean-Pierre Lefebvre <[email protected]>
* and Remi Lefebvre <[email protected]>
*
* atftp is free software; you can redistribute them and/or modify them
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/tftp.h>
#include <netdb.h>
#include <string.h>
#include <sys/stat.h>
#include "tftp.h"
#include "tftp_io.h"
#include "tftp_def.h"
#include "options.h"
#define S_BEGIN 0
#define S_SEND_REQ 1
#define S_SEND_ACK 2
#define S_SEND_OACK 3
#define S_SEND_DATA 4
#define S_WAIT_PACKET 5
#define S_REQ_RECEIVED 6
#define S_ACK_RECEIVED 7
#define S_OACK_RECEIVED 8
#define S_DATA_RECEIVED 9
#define S_ABORT 10
#define S_END 11
#define NB_BLOCK 2048
extern int tftp_cancel;
/*
* Find a hole in the file bitmap.
*/
int tftp_find_bitmap_hole(int prev_hole, unsigned int *bitmap)
{
int next_hole, next_word_no, next_bit_no;
unsigned int next_word;
/* initial stuff */
next_hole = 0; /*prev_hole + 1;*/
next_word_no = next_hole / 32;
next_bit_no = next_hole % 32;
next_word = bitmap[next_word_no];
/* Check if there is a remainder of the current word to traverse */
if (next_bit_no != 0)
{
/* traverse remainder of word. We know that all previous
bits are set */
if (next_word == 0xffffffff)
{
next_bit_no = 0;
next_word_no++;
next_word = bitmap[next_word_no];
}
}
/* travserse whole words */
while ((next_word == 0xffffffff) && (next_word_no < NB_BLOCK))
{
next_word_no++;
next_word = bitmap[next_word_no];
}
/* find the bit */
next_word >>= next_bit_no;
while (next_word & 1)
{
next_bit_no++;
next_word >>= 1;
}
return (next_word_no * 32) + next_bit_no;
}
/*
* Receive a file. This is implemented as a state machine using a while loop
* and a switch statement. Function flow is as follow:
* - sanity check
* - enter state machine
*
* 1) send request
* 2) wait reply
* - if DATA packet, read it, send an acknoledge, goto 2
* - if OACK (option acknowledge) acknowledge this option, goto 2
* - if ERROR abort
* - if TIMEOUT goto previous state
*/
int tftp_receive_file(struct client_data *data)
{
int state = S_SEND_REQ; /* current state in the state machine */
int timeout_state = state; /* what state should we go on when timeout */
int result;
long block_number = 0;
long last_block_number = -1;/* block number of last block for multicast */
int data_size; /* size of data received */
int sockfd = data->sockfd; /* just to simplify calls */
struct sockaddr_storage sa; /* a copy of data.sa_peer */
struct sockaddr_storage from;
char from_str[SOCKADDR_PRINT_ADDR_LEN];
int connected; /* 1 when sockfd is connected */
struct tftphdr *tftphdr = (struct tftphdr *)data->data_buffer;
FILE *fp = NULL; /* the local file pointer */
int number_of_timeout = 0;
int convert = 0; /* if true, do netascii convertion */
int oacks = 0; /* count OACK for improved error checking */
int multicast = 0; /* set to 1 if multicast */
int mc_port; /* multicast port */
char mc_addr[IPADDRLEN]; /* multicast address */
int mcast_sockfd = 0;
struct addrinfo hints, *addrinfo;
struct sockaddr_storage sa_mcast_group;
struct sockaddr_storage sa_mcast;
union ip_mreq_storage mreq;
int master_client = 0;
unsigned int file_bitmap[NB_BLOCK];
int prev_bitmap_hole = -1; /* the previous hole found in the bitmap */
char string[MAXLEN];
long prev_block_number = 0; /* needed to support netascii convertion */
int temp = 0;
int err;
data->file_size = 0;
tftp_cancel = 0;
memset(&from, 0, sizeof(from));
memset(&sa_mcast_group, 0, sizeof(sa_mcast_group));
memset(&file_bitmap, 0, sizeof(file_bitmap));
/* make sure the socket is not connected */
sa.ss_family = AF_UNSPEC;
connect(sockfd, (struct sockaddr *)&sa, sizeof(sa));
connected = 0;
/* copy sa_peer structure */
memcpy(&sa, &data->sa_peer, sizeof(sa));
/* check to see if conversion is requiered */
if (strcasecmp(data->tftp_options[OPT_MODE].value, "netascii") == 0)
convert = 1;
/* make sure the data buffer is SEGSIZE + 4 bytes */
if (data->data_buffer_size != (SEGSIZE + 4))
{
data->data_buffer = realloc(data->data_buffer, SEGSIZE + 4);
tftphdr = (struct tftphdr *)data->data_buffer;
if (data->data_buffer == NULL)
{
fprintf(stderr, "tftp: memory allocation failure.\n");
exit(1);
}
data->data_buffer_size = SEGSIZE + 4;
}
/* open the file for writing */
if ((fp = fopen(data->local_file, "w")) == NULL)
{
fprintf(stderr, "tftp: can't open %s for writing.\n",
data->local_file);
return ERR;
}
while (1)
{
#ifdef DEBUG
if (data->delay)
usleep(data->delay*1000);
#endif
if (tftp_cancel)
{
if (from.ss_family == 0)
state = S_ABORT;
else
{
tftp_send_error(sockfd, &sa, EUNDEF, data->data_buffer,
data->data_buffer_size);
if (data->trace)
fprintf(stderr, "sent ERROR <code: %d, msg: %s>\n",
EUNDEF, tftp_errmsg[EUNDEF]);
state = S_ABORT;
}
tftp_cancel = 0;
}
switch (state)
{
case S_SEND_REQ:
timeout_state = S_SEND_REQ;
if (data->trace)
{
opt_options_to_string(data->tftp_options, string, MAXLEN);
fprintf(stderr, "sent RRQ <file: %s, mode: %s <%s>>\n",
data->tftp_options[OPT_FILENAME].value,
data->tftp_options[OPT_MODE].value,
string);
}
sockaddr_set_port(&sa, sockaddr_get_port(&data->sa_peer));
/* send request packet */
if (tftp_send_request(sockfd, &sa, RRQ, data->data_buffer,
data->data_buffer_size,
data->tftp_options) == ERR)
state = S_ABORT;
else
state = S_WAIT_PACKET;
sockaddr_set_port(&sa, 0); /* must be set to 0 before the fist call to
tftp_get_packet, but is was set before the
call to tftp_send_request */
break;
case S_SEND_ACK:
timeout_state = S_SEND_ACK;
if (multicast)
{
/* walk the bitmap to find the next missing block */
prev_bitmap_hole =
tftp_find_bitmap_hole(prev_bitmap_hole, file_bitmap);
block_number = prev_bitmap_hole;
}
if (data->trace)
fprintf(stderr, "sent ACK <block: %ld>\n", block_number);
tftp_send_ack(sockfd, &sa, block_number);
/* if we just ACK the last block we are done */
if (block_number == last_block_number)
state = S_END;
else
state = S_WAIT_PACKET;
break;
case S_WAIT_PACKET:
data_size = data->data_buffer_size;
if (multicast)
{
result = tftp_get_packet(sockfd, mcast_sockfd, NULL, &sa, &from,
NULL, data->timeout, &data_size,
data->data_buffer);
/* RFC2090 state we should verify source address as well
as source port */
if (!sockaddr_equal(&sa, &from))
{
result = GET_DISCARD;
fprintf(stderr, "source address or port mismatch\n");
}
}
else
{
result = tftp_get_packet(sockfd, -1, NULL, &sa, &from, NULL,
data->timeout, &data_size,
data->data_buffer);
/* Check that source port match */
if ((sockaddr_get_port(&sa) != sockaddr_get_port(&from)) &&
((result == GET_OACK) || (result == GET_ERROR) ||
(result == GET_DATA)))
{
if (data->checkport)
{
result = GET_DISCARD;
fprintf(stderr, "source port mismatch\n");
}
else
fprintf(stderr, "source port mismatch, check bypassed");
}
}
switch (result)
{
case GET_TIMEOUT:
number_of_timeout++;
fprintf(stderr, "timeout: retrying...\n");
if (number_of_timeout > NB_OF_RETRY)
state = S_ABORT;
else
state = timeout_state;
break;
case GET_OACK:
number_of_timeout = 0;
/* if the socket if not connected, connect it */
if (!connected)
{
connect(sockfd, (struct sockaddr *)&sa, sizeof(sa));
connected = 1;
}
state = S_OACK_RECEIVED;
break;
case GET_ERROR:
fprintf(stderr, "tftp: error received from server <");
fwrite(tftphdr->th_msg, 1, data_size - 4 - 1, stderr);
fprintf(stderr, ">\n");
state = S_ABORT;
break;
case GET_DATA:
number_of_timeout = 0;
/* if the socket if not connected, connect it */
if (!connected)
{
connect(sockfd, (struct sockaddr *)&sa, sizeof(sa));
connected = 1;
}
state = S_DATA_RECEIVED;
break;
case GET_DISCARD:
/* consider discarded packet as timeout to make sure when don't
lock up when doing multicast transfer and routing is broken */
number_of_timeout++;
fprintf(stderr, "tftp: packet discard <%s:%d>.\n",
sockaddr_print_addr(&from, from_str, sizeof(from_str)),
sockaddr_get_port(&from));
if (number_of_timeout > NB_OF_RETRY)
state = S_ABORT;
break;
case ERR:
fprintf(stderr, "tftp: unknown error.\n");
state = S_ABORT;
break;
default:
fprintf(stderr, "tftp: abnormal return value %d.\n",
result);
}
break;
case S_OACK_RECEIVED:
oacks++;
if (multicast)
{
/* This is not the first oack. From the RFC, I don't think
it is illegal to receive many OACK. Need to check more
into that, but server may send us an OACK with mc=0 anytime */
#if 0
/* If we are a master, it is abnormal to receive again
* an OACK. We should terminate the file transfer of we'll
* timeout and exit.
*/
if (master_client == 1)
{
tftp_send_error(sockfd, &sa, EUNDEF, data->data_buffer,
data->data_buffer_size);
fprintf(stderr, "tftp: unexpected OACK\n");
state = S_ABORT;
break;
}
#endif
/* parse OACK options */
opt_parse_options(data->data_buffer, data_size,
data->tftp_options_reply);
if ((result = opt_get_multicast(data->tftp_options_reply,
mc_addr, &mc_port,
&master_client)) > -1)
if (master_client == 1)
{
if (data->trace)
fprintf(stderr, "received OACK <mc = 1>\n");
state = S_SEND_ACK;
}
else
{
if (data->trace)
fprintf(stderr, "received OACK <mc = 0>\n");
state = S_WAIT_PACKET;
}
else
{
tftp_send_error(sockfd, &sa, EUNDEF, data->data_buffer,
data->data_buffer_size);
fprintf(stderr, "tftp: error parsing OACK\n");
state = S_ABORT;
}
break;
}
else
{
/* Normally we shouldn't receive more than one OACK
in non-multicast mode. */
if (oacks > 1)
{
tftp_send_error(sockfd, &sa, EUNDEF, data->data_buffer,
data->data_buffer_size);
fprintf(stderr, "tftp: unexpected OACK\n");
state = S_ABORT;
break;
}
/* clean the tftp_options structure */
memcpy(data->tftp_options_reply, tftp_default_options,
sizeof(tftp_default_options));
/*
* look in the returned string for tsize, timeout, blksize
* or multicast
*/
opt_disable_options(data->tftp_options_reply, NULL);
opt_parse_options(data->data_buffer, data_size,
data->tftp_options_reply);
if (data->trace)
fprintf(stderr, "received OACK <");
/* tsize: funny, now we know the file size */
if ((result = opt_get_tsize(data->tftp_options_reply)) >
-1)
{
if (data->trace)
fprintf(stderr, "tsize: %d, ", result);
}
/* timeout */
if ((result = opt_get_timeout(data->tftp_options_reply))
> -1)
{
if (data->trace)
fprintf(stderr, "timeout: %d, ", result);
}
/* blksize: resize the buffer please */
if ((result = opt_get_blksize(data->tftp_options_reply))
> -1)
{
if (data->trace)
fprintf(stderr, "blksize: %d, ", result);
data->data_buffer = realloc(data->data_buffer,
result + 4);
tftphdr = (struct tftphdr *)data->data_buffer;
if (data->data_buffer == NULL)
{
fprintf(stderr,
"tftp: memory allocation failure.\n");
exit(1);
}
data->data_buffer_size = result + 4;
}
/* multicast: yish, it's more complex. If we are a master,
we are responsible to ask packet with an ACK. If we are
not master, then just receive packets. Missing packets
will be asked when we become a master client. Also we
can receive data in any order, with hole. The option
reply contain the new address and port to listen to.*/
if ((result = opt_get_multicast(data->tftp_options_reply,
mc_addr, &mc_port,
&master_client)) > -1)
{
if (data->trace)
fprintf(stderr, "multicast: %s,%d,%d, ", mc_addr,
mc_port, master_client);
/* look up the host */
/* if valid, update s_inn structure */
memset(&hints, 0, sizeof(hints));
hints.ai_socktype = SOCK_DGRAM;
if (!getaddrinfo(mc_addr, NULL, &hints, &addrinfo) &&
!sockaddr_set_addrinfo(&sa_mcast_group, addrinfo))
{
if (!sockaddr_is_multicast(&sa_mcast_group))
{
fprintf(stderr,
"atftp: bad multicast address %s\n",
mc_addr);
exit(1);
}
freeaddrinfo(addrinfo);
}
else
{
fprintf(stderr, "tftp: bad multicast address %s",
mc_addr);
exit(1);
}
/* we need to open a new socket for multicast */
if ((mcast_sockfd = socket(sa_mcast_group.ss_family,
SOCK_DGRAM, 0))<0)
{
fprintf(stderr,
"atftp: unable to open socket\n");
exit(1);
}
memset(&sa_mcast, 0, sizeof(sa_mcast));
sa_mcast.ss_family = sa_mcast_group.ss_family;
sockaddr_set_port(&sa_mcast, mc_port);
if (bind(mcast_sockfd, (struct sockaddr *)&sa_mcast,
sizeof(sa_mcast)) < 0)
{
perror("bind"); /* FIXME */
exit(1);
}
sockaddr_get_mreq(&sa_mcast_group, &mreq);
if (sa_mcast_group.ss_family == AF_INET)
err = setsockopt(mcast_sockfd, IPPROTO_IP,
IP_ADD_MEMBERSHIP,
&mreq.v4, sizeof(mreq.v4));
else
err = setsockopt(mcast_sockfd, IPPROTO_IPV6,
IPV6_ADD_MEMBERSHIP,
&mreq.v6, sizeof(mreq.v6));
if (err < 0)
{
perror("setsockopt");
exit(1);
}
multicast = 1;
}
}
if (data->trace)
fprintf(stderr, "\b\b>\n");
if ((multicast && master_client) || (!multicast))
state = S_SEND_ACK;
else
state = S_WAIT_PACKET;
break;
case S_DATA_RECEIVED:
if ((multicast && master_client) || (!multicast))
timeout_state = S_SEND_ACK;
else
timeout_state = S_WAIT_PACKET;
if (multicast)
block_number = ntohs(tftphdr->th_block);
else
{
block_number = tftp_rollover_blocknumber(
ntohs(tftphdr->th_block), prev_block_number, 0);
}
if (data->trace)
fprintf(stderr, "received DATA <block: %ld, size: %d>\n",
block_number, data_size - 4);
if (tftp_file_write(fp, tftphdr->th_data, data->data_buffer_size - 4, block_number,
data_size - 4, convert, &prev_block_number, &temp)
!= data_size - 4)
{
fprintf(stderr, "tftp: error writing to file %s\n",
data->local_file);
tftp_send_error(sockfd, &sa, ENOSPACE, data->data_buffer,
data->data_buffer_size);
state = S_ABORT;
break;
}
data->file_size += data_size;
/* Record the block number of the last block. The last block
is the one with less data than the transfer block size */
if (data_size < data->data_buffer_size)
last_block_number = block_number;
if (multicast)
{
/* Mark the received block in the bitmap */
file_bitmap[(block_number - 1)/32]
|= (1 << ((block_number - 1) % 32));
/* if we are the master client we ack, else
we just wait for data */
if (master_client || !multicast)
state = S_SEND_ACK;
else
state = S_WAIT_PACKET;
}
else
state = S_SEND_ACK;
break;
case S_END:
case S_ABORT:
/* close file */
if (fp)
fclose(fp);
/* drop multicast membership */
if (multicast)
{
if (sa_mcast_group.ss_family == AF_INET)
err = setsockopt(mcast_sockfd, IPPROTO_IP,
IP_DROP_MEMBERSHIP,
&mreq.v4, sizeof(mreq.v4));
else
err = setsockopt(mcast_sockfd, IPPROTO_IPV6,
IPV6_DROP_MEMBERSHIP,
&mreq.v6, sizeof(mreq.v6));
if (err < 0)
{
perror("setsockopt");
exit(1);
}
}
/* close multicast socket */
if (mcast_sockfd)
close(mcast_sockfd);
/* return proper error code */
if (state == S_END)
return OK;
else
fprintf(stderr, "tftp: aborting\n");
default:
return ERR;
}
}
}
/*
* Send a file. This is implemented as a state machine using a while loop
* and a switch statement. Function flow is as follow:
* - sanity check
* - enter state machine
*
* 1) send request
* 2) wait replay
* - if ACK, goto 3
* - if OACK (option acknowledge) acknowledge this option, goto 2
* - if ERROR abort
* - if TIMEOUT goto previous state
* 3) send data, goto 2
*/
int tftp_send_file(struct client_data *data)
{
int state = S_SEND_REQ; /* current state in the state machine */
int timeout_state = state; /* what state should we go on when timeout */
int result;
long block_number = 0;
long last_block = -1;
int data_size; /* size of data received */
int sockfd = data->sockfd; /* just to simplify calls */
struct sockaddr_storage sa; /* a copy of data.sa_peer */
struct sockaddr_storage from;
char from_str[SOCKADDR_PRINT_ADDR_LEN];
int connected; /* 1 when sockfd is connected */
struct tftphdr *tftphdr = (struct tftphdr *)data->data_buffer;
FILE *fp; /* the local file pointer */
int number_of_timeout = 0;
struct stat file_stat;
int convert = 0; /* if true, do netascii convertion */
char string[MAXLEN];
long prev_block_number = 0; /* needed to support netascii convertion */
long prev_file_pos = 0;
int temp = 0;
data->file_size = 0;
tftp_cancel = 0;
memset(&from, 0, sizeof(from));
/* make sure the socket is not connected */
sa.ss_family = AF_UNSPEC;
connect(sockfd, (struct sockaddr *)&sa, sizeof(sa));
connected = 0;
/* copy sa_peer structure */
memcpy(&sa, &data->sa_peer, sizeof(sa));
/* check to see if conversion is requiered */
if (strcasecmp(data->tftp_options[OPT_MODE].value, "netascii") == 0)
convert = 1;
/* make sure the data buffer is SEGSIZE + 4 bytes */
if (data->data_buffer_size != (SEGSIZE + 4))
{
data->data_buffer = realloc(data->data_buffer, SEGSIZE + 4);
tftphdr = (struct tftphdr *)data->data_buffer;
if (data->data_buffer == NULL)
{
fprintf(stderr, "tftp: memory allocation failure.\n");
exit(1);
}
data->data_buffer_size = SEGSIZE + 4;
}
/* open the file for reading */
if ((fp = fopen(data->local_file, "r")) == NULL)
{
fprintf(stderr, "tftp: can't open %s for reading.\n",
data->local_file);
return ERR;
}
/* When sending a file with the tsize argument, we shall
put the file size as argument */
fstat(fileno(fp), &file_stat);
if (opt_get_tsize(data->tftp_options) > -1)
opt_set_tsize(file_stat.st_size, data->tftp_options);
while (1)
{
#ifdef DEBUG
if (data->delay)
usleep(data->delay*1000);
#endif
if (tftp_cancel)
{
/* Make sure we know the peer's address */
if (from.ss_family == 0)
state = S_ABORT;
else
{
tftp_send_error(sockfd, &sa, EUNDEF, data->data_buffer,
data->data_buffer_size);
if (data->trace)
fprintf(stderr, "sent ERROR <code: %d, msg: %s>\n",
EUNDEF, tftp_errmsg[EUNDEF]);
state = S_ABORT;
}
tftp_cancel = 0;
}
switch (state)
{
case S_SEND_REQ:
timeout_state = S_SEND_REQ;
if (data->trace)
{
opt_options_to_string(data->tftp_options, string, MAXLEN);
fprintf(stderr, "sent WRQ <file: %s, mode: %s <%s>>\n",
data->tftp_options[OPT_FILENAME].value,
data->tftp_options[OPT_MODE].value,
string);
}
sockaddr_set_port(&sa, sockaddr_get_port(&data->sa_peer));
/* send request packet */
if (tftp_send_request(sockfd, &sa, WRQ, data->data_buffer,
data->data_buffer_size,
data->tftp_options) == ERR)
state = S_ABORT;
else
state = S_WAIT_PACKET;
sockaddr_set_port(&sa, 0); /* must be set to 0 before the fist call to
tftp_get_packet, but is was set before the
call to tftp_send_request */
break;
case S_SEND_DATA:
timeout_state = S_SEND_DATA;
data_size = tftp_file_read(fp, tftphdr->th_data, data->data_buffer_size - 4, block_number,
convert, &prev_block_number, &prev_file_pos, &temp);
data_size += 4; /* need to consider tftp header */
if (feof(fp))
last_block = block_number;
tftp_send_data(sockfd, &sa, block_number + 1,
data_size, data->data_buffer);
data->file_size += data_size;
if (data->trace)
fprintf(stderr, "sent DATA <block: %ld, size: %d>\n",
block_number + 1, data_size - 4);
state = S_WAIT_PACKET;
break;
case S_WAIT_PACKET:
data_size = data->data_buffer_size;
result = tftp_get_packet(sockfd, -1, NULL, &sa, &from, NULL,
data->timeout, &data_size,
data->data_buffer);
/* check that source port match */
if (sockaddr_get_port(&sa) != sockaddr_get_port(&from))
{
if ((data->checkport) &&
((result == GET_ACK) || (result == GET_OACK) ||
(result == GET_ERROR)))
result = GET_DISCARD;
else
fprintf(stderr, "source port mismatch, check bypassed");
}
switch (result)
{
case GET_TIMEOUT:
number_of_timeout++;
fprintf(stderr, "timeout: retrying...\n");
if (number_of_timeout > NB_OF_RETRY)
state = S_ABORT;
else
state = timeout_state;
break;
case GET_ACK:
number_of_timeout = 0;
/* if the socket if not connected, connect it */
if (!connected)
{
//connect(sockfd, (struct sockaddr *)&sa, sizeof(sa));
connected = 1;
}
block_number = tftp_rollover_blocknumber(
ntohs(tftphdr->th_block), prev_block_number, 0);
if (data->trace)
fprintf(stderr, "received ACK <block: %ld>\n",
block_number);
if ((last_block != -1) && (block_number > last_block))
{
state = S_END;
break;
}
state = S_SEND_DATA;
break;
case GET_OACK:
number_of_timeout = 0;
/* if the socket if not connected, connect it */
if (!connected)
{
//connect(sockfd, (struct sockaddr *)&sa, sizeof(sa));
connected = 1;
}
state = S_OACK_RECEIVED;
break;
case GET_ERROR:
fprintf(stderr, "tftp: error received from server <");
fwrite(tftphdr->th_msg, 1, data_size - 4 - 1, stderr);
fprintf(stderr, ">\n");
state = S_ABORT;
break;
case GET_DISCARD:
/* consider discarded packet as timeout to make sure when don't lock up
if routing is broken */
number_of_timeout++;
fprintf(stderr, "tftp: packet discard <%s:%d>.\n",
sockaddr_print_addr(&from, from_str, sizeof(from_str)),
sockaddr_get_port(&from));
if (number_of_timeout > NB_OF_RETRY)
state = S_ABORT;
break;
case ERR:
fprintf(stderr, "tftp: unknown error.\n");
state = S_ABORT;
break;
default:
fprintf(stderr, "tftp: abnormal return value %d.\n",
result);
}
break;
case S_OACK_RECEIVED:
/* clean the tftp_options structure */
memcpy(data->tftp_options_reply, tftp_default_options,
sizeof(tftp_default_options));
/*
* look in the returned string for tsize, timeout, blksize or
* multicast
*/
opt_disable_options(data->tftp_options_reply, NULL);
opt_parse_options(data->data_buffer, data_size,
data->tftp_options_reply);
if (data->trace)
fprintf(stderr, "received OACK <");
/* tsize: funny, now we know the file size */
if ((result = opt_get_tsize(data->tftp_options_reply)) > -1)
{
if (data->trace)
fprintf(stderr, "tsize: %d, ", result);
}
/* timeout */
if ((result = opt_get_timeout(data->tftp_options_reply)) > -1)
{
if (data->trace)
fprintf(stderr, "timeout: %d, ", result);
}
/* blksize: resize the buffer please */
if ((result = opt_get_blksize(data->tftp_options_reply)) > -1)
{
if (data->trace)
fprintf(stderr, "blksize: %d, ", result);
data->data_buffer = realloc(data->data_buffer,
result + 4);
tftphdr = (struct tftphdr *)data->data_buffer;
if (data->data_buffer == NULL)
{
fprintf(stderr,
"tftp: memory allocation failure.\n");
exit(1);
}
data->data_buffer_size = result + 4;
}
/* multicast: yish, it's more complex. If we are a master,
we are responsible to ask packet with an ACK. If we are
not master, then just receive packets. Missing packets
will be asked when we become a master client */
if (data->trace)
fprintf(stderr, "\b\b>\n");
state = S_SEND_DATA;
break;
case S_END:
if (fp)
fclose(fp);
return OK;
break;
case S_ABORT:
if (fp)
fclose(fp);
fprintf(stderr, "tftp: aborting\n");
default:
return ERR;
}
}
}