forked from ParallelSSH/ssh-python
-
Notifications
You must be signed in to change notification settings - Fork 1
Expand file tree
/
Copy pathsftp.c
More file actions
3452 lines (2982 loc) · 88 KB
/
sftp.c
File metadata and controls
3452 lines (2982 loc) · 88 KB
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
/*
* sftp.c - Secure FTP functions
*
* This file is part of the SSH Library
*
* Copyright (c) 2005-2008 by Aris Adamantiadis
* Copyright (c) 2008-2018 by Andreas Schneider <asn@cryptomilk.org>
*
* The SSH Library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The SSH Library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the SSH Library; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
/* This file contains code written by Nick Zitzmann */
#include "config.h"
#include <stdbool.h>
#include <errno.h>
#include <ctype.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdint.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif /* HAVE_SYS_TIME_H */
#include <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#ifndef _WIN32
#include <netinet/in.h>
#include <arpa/inet.h>
#endif
#include "libssh/priv.h"
#include "libssh/ssh2.h"
#include "libssh/sftp.h"
#include "libssh/sftp_priv.h"
#include "libssh/buffer.h"
#include "libssh/channels.h"
#include "libssh/session.h"
#include "libssh/misc.h"
#include "libssh/bytearray.h"
#ifdef WITH_SFTP
/* Buffer size maximum is 256M */
#define SFTP_PACKET_SIZE_MAX 0x10000000
struct sftp_ext_struct {
uint32_t count;
char **name;
char **data;
};
/* functions */
static int sftp_enqueue(sftp_session session, sftp_message msg);
static void sftp_message_free(sftp_message msg);
static void sftp_set_error(sftp_session sftp, int errnum);
static void status_msg_free(sftp_status_message status);
static sftp_ext sftp_ext_new(void) {
sftp_ext ext;
ext = calloc(1, sizeof(struct sftp_ext_struct));
if (ext == NULL) {
return NULL;
}
return ext;
}
static void sftp_ext_free(sftp_ext ext)
{
size_t i;
if (ext == NULL) {
return;
}
if (ext->count > 0) {
if (ext->name != NULL) {
for (i = 0; i < ext->count; i++) {
SAFE_FREE(ext->name[i]);
}
SAFE_FREE(ext->name);
}
if (ext->data != NULL) {
for (i = 0; i < ext->count; i++) {
SAFE_FREE(ext->data[i]);
}
SAFE_FREE(ext->data);
}
}
SAFE_FREE(ext);
}
sftp_session sftp_new(ssh_session session)
{
sftp_session sftp;
if (session == NULL) {
return NULL;
}
sftp = calloc(1, sizeof(struct sftp_session_struct));
if (sftp == NULL) {
ssh_set_error_oom(session);
return NULL;
}
sftp->ext = sftp_ext_new();
if (sftp->ext == NULL) {
ssh_set_error_oom(session);
goto error;
}
sftp->read_packet = calloc(1, sizeof(struct sftp_packet_struct));
if (sftp->read_packet == NULL) {
ssh_set_error_oom(session);
goto error;
}
sftp->read_packet->payload = ssh_buffer_new();
if (sftp->read_packet->payload == NULL) {
ssh_set_error_oom(session);
goto error;
}
sftp->session = session;
sftp->channel = ssh_channel_new(session);
if (sftp->channel == NULL) {
ssh_set_error_oom(session);
goto error;
}
if (ssh_channel_open_session(sftp->channel)) {
goto error;
}
if (ssh_channel_request_sftp(sftp->channel)) {
goto error;
}
return sftp;
error:
if (sftp->ext != NULL) {
sftp_ext_free(sftp->ext);
}
if (sftp->channel != NULL) {
ssh_channel_free(sftp->channel);
}
if (sftp->read_packet != NULL) {
if (sftp->read_packet->payload != NULL) {
SSH_BUFFER_FREE(sftp->read_packet->payload);
}
SAFE_FREE(sftp->read_packet);
}
SAFE_FREE(sftp);
return NULL;
}
sftp_session
sftp_new_channel(ssh_session session, ssh_channel channel)
{
sftp_session sftp = NULL;
if (session == NULL) {
return NULL;
}
sftp = calloc(1, sizeof(struct sftp_session_struct));
if (sftp == NULL) {
ssh_set_error_oom(session);
return NULL;
}
sftp->ext = sftp_ext_new();
if (sftp->ext == NULL) {
ssh_set_error_oom(session);
goto error;
}
sftp->read_packet = calloc(1, sizeof(struct sftp_packet_struct));
if (sftp->read_packet == NULL) {
ssh_set_error_oom(session);
goto error;
}
sftp->read_packet->payload = ssh_buffer_new();
if (sftp->read_packet->payload == NULL) {
ssh_set_error_oom(session);
goto error;
}
sftp->session = session;
sftp->channel = channel;
return sftp;
error:
if (sftp->ext != NULL) {
sftp_ext_free(sftp->ext);
}
if (sftp->read_packet != NULL) {
if (sftp->read_packet->payload != NULL) {
SSH_BUFFER_FREE(sftp->read_packet->payload);
}
SAFE_FREE(sftp->read_packet);
}
SAFE_FREE(sftp);
return NULL;
}
#ifdef WITH_SERVER
sftp_session
sftp_server_new(ssh_session session, ssh_channel chan)
{
sftp_session sftp = NULL;
sftp = calloc(1, sizeof(struct sftp_session_struct));
if (sftp == NULL) {
ssh_set_error_oom(session);
return NULL;
}
sftp->read_packet = calloc(1, sizeof(struct sftp_packet_struct));
if (sftp->read_packet == NULL) {
goto error;
}
sftp->read_packet->payload = ssh_buffer_new();
if (sftp->read_packet->payload == NULL) {
goto error;
}
sftp->session = session;
sftp->channel = chan;
return sftp;
error:
ssh_set_error_oom(session);
if (sftp->read_packet != NULL) {
if (sftp->read_packet->payload != NULL) {
SSH_BUFFER_FREE(sftp->read_packet->payload);
}
SAFE_FREE(sftp->read_packet);
}
SAFE_FREE(sftp);
return NULL;
}
int sftp_server_init(sftp_session sftp){
ssh_session session = sftp->session;
sftp_packet packet = NULL;
ssh_buffer reply = NULL;
uint32_t version;
int rc;
packet = sftp_packet_read(sftp);
if (packet == NULL) {
return -1;
}
if (packet->type != SSH_FXP_INIT) {
ssh_set_error(session, SSH_FATAL,
"Packet read of type %d instead of SSH_FXP_INIT",
packet->type);
return -1;
}
SSH_LOG(SSH_LOG_PACKET, "Received SSH_FXP_INIT");
ssh_buffer_get_u32(packet->payload, &version);
version = ntohl(version);
SSH_LOG(SSH_LOG_PACKET, "Client version: %d", version);
sftp->client_version = (int)version;
reply = ssh_buffer_new();
if (reply == NULL) {
ssh_set_error_oom(session);
return -1;
}
rc = ssh_buffer_pack(reply, "dssss",
LIBSFTP_VERSION,
"posix-rename@openssh.com",
"1",
"hardlink@openssh.com",
"1");
if (rc != SSH_OK) {
ssh_set_error_oom(session);
SSH_BUFFER_FREE(reply);
return -1;
}
if (sftp_packet_write(sftp, SSH_FXP_VERSION, reply) < 0) {
SSH_BUFFER_FREE(reply);
return -1;
}
SSH_BUFFER_FREE(reply);
SSH_LOG(SSH_LOG_PROTOCOL, "Server version sent");
if (version > LIBSFTP_VERSION) {
sftp->version = LIBSFTP_VERSION;
} else {
sftp->version = (int)version;
}
return 0;
}
void sftp_server_free(sftp_session sftp)
{
sftp_request_queue ptr;
if (sftp == NULL) {
return;
}
ptr = sftp->queue;
while(ptr) {
sftp_request_queue old;
sftp_message_free(ptr->message);
old = ptr->next;
SAFE_FREE(ptr);
ptr = old;
}
SAFE_FREE(sftp->handles);
SSH_BUFFER_FREE(sftp->read_packet->payload);
SAFE_FREE(sftp->read_packet);
sftp_ext_free(sftp->ext);
SAFE_FREE(sftp);
}
#endif /* WITH_SERVER */
void sftp_free(sftp_session sftp)
{
sftp_request_queue ptr;
if (sftp == NULL) {
return;
}
if (sftp->channel != NULL) {
ssh_channel_send_eof(sftp->channel);
ptr = sftp->queue;
while(ptr) {
sftp_request_queue old;
sftp_message_free(ptr->message);
old = ptr->next;
SAFE_FREE(ptr);
ptr = old;
}
ssh_channel_free(sftp->channel);
sftp->channel = NULL;
}
SAFE_FREE(sftp->handles);
SSH_BUFFER_FREE(sftp->read_packet->payload);
SAFE_FREE(sftp->read_packet);
sftp_ext_free(sftp->ext);
SAFE_FREE(sftp);
}
int sftp_packet_write(sftp_session sftp, uint8_t type, ssh_buffer payload)
{
uint8_t header[5] = {0};
uint32_t payload_size;
int size;
int rc;
/* Add size of type */
payload_size = ssh_buffer_get_len(payload) + sizeof(uint8_t);
PUSH_BE_U32(header, 0, payload_size);
PUSH_BE_U8(header, 4, type);
rc = ssh_buffer_prepend_data(payload, header, sizeof(header));
if (rc < 0) {
ssh_set_error_oom(sftp->session);
sftp_set_error(sftp, SSH_FX_FAILURE);
return -1;
}
size = ssh_channel_write(sftp->channel,
ssh_buffer_get(payload),
ssh_buffer_get_len(payload));
if (size < 0) {
sftp_set_error(sftp, SSH_FX_FAILURE);
return -1;
}
if ((uint32_t)size != ssh_buffer_get_len(payload)) {
SSH_LOG(SSH_LOG_PACKET,
"Had to write %d bytes, wrote only %d",
ssh_buffer_get_len(payload),
size);
}
return size;
}
sftp_packet sftp_packet_read(sftp_session sftp)
{
uint8_t tmpbuf[4];
uint8_t *buffer = NULL;
sftp_packet packet = sftp->read_packet;
uint32_t size;
int nread;
bool is_eof;
int rc;
packet->sftp = sftp;
/*
* If the packet has a payload, then just reinit the buffer, otherwise
* allocate a new one.
*/
if (packet->payload != NULL) {
rc = ssh_buffer_reinit(packet->payload);
if (rc != 0) {
ssh_set_error_oom(sftp->session);
sftp_set_error(sftp, SSH_FX_FAILURE);
return NULL;
}
} else {
packet->payload = ssh_buffer_new();
if (packet->payload == NULL) {
ssh_set_error_oom(sftp->session);
sftp_set_error(sftp, SSH_FX_FAILURE);
return NULL;
}
}
nread = 0;
do {
int s;
// read from channel until 4 bytes have been read or an error occurs
s = ssh_channel_read(sftp->channel, tmpbuf + nread, 4 - nread, 0);
if (s < 0) {
goto error;
} else if (s == 0) {
is_eof = ssh_channel_is_eof(sftp->channel);
if (is_eof) {
ssh_set_error(sftp->session,
SSH_FATAL,
"Received EOF while reading sftp packet size");
sftp_set_error(sftp, SSH_FX_EOF);
goto error;
}
} else {
nread += s;
}
} while (nread < 4);
size = PULL_BE_U32(tmpbuf, 0);
if (size == 0 || size > SFTP_PACKET_SIZE_MAX) {
ssh_set_error(sftp->session, SSH_FATAL, "Invalid sftp packet size!");
sftp_set_error(sftp, SSH_FX_FAILURE);
goto error;
}
do {
nread = ssh_channel_read(sftp->channel, tmpbuf, 1, 0);
if (nread < 0) {
goto error;
} else if (nread == 0) {
is_eof = ssh_channel_is_eof(sftp->channel);
if (is_eof) {
ssh_set_error(sftp->session,
SSH_FATAL,
"Received EOF while reading sftp packet type");
sftp_set_error(sftp, SSH_FX_EOF);
goto error;
}
}
} while (nread < 1);
packet->type = tmpbuf[0];
/* Remove the packet type size */
size -= sizeof(uint8_t);
/* Allocate the receive buffer from payload */
buffer = ssh_buffer_allocate(packet->payload, size);
if (buffer == NULL) {
ssh_set_error_oom(sftp->session);
sftp_set_error(sftp, SSH_FX_FAILURE);
goto error;
}
while (size > 0 && size < SFTP_PACKET_SIZE_MAX) {
nread = ssh_channel_read(sftp->channel, buffer, size, 0);
if (nread < 0) {
/* TODO: check if there are cases where an error needs to be set here */
goto error;
}
if (nread > 0) {
buffer += nread;
size -= nread;
} else { /* nread == 0 */
/* Retry the reading unless the remote was closed */
is_eof = ssh_channel_is_eof(sftp->channel);
if (is_eof) {
ssh_set_error(sftp->session,
SSH_REQUEST_DENIED,
"Received EOF while reading sftp packet");
sftp_set_error(sftp, SSH_FX_EOF);
goto error;
}
}
}
return packet;
error:
ssh_buffer_reinit(packet->payload);
return NULL;
}
static void sftp_set_error(sftp_session sftp, int errnum) {
if (sftp != NULL) {
sftp->errnum = errnum;
}
}
/* Get the last sftp error */
int sftp_get_error(sftp_session sftp) {
if (sftp == NULL) {
return -1;
}
return sftp->errnum;
}
static void sftp_message_free(sftp_message msg)
{
if (msg == NULL) {
return;
}
SSH_BUFFER_FREE(msg->payload);
SAFE_FREE(msg);
}
static sftp_message sftp_get_message(sftp_packet packet)
{
sftp_session sftp = packet->sftp;
sftp_message msg = NULL;
int rc;
switch(packet->type) {
case SSH_FXP_STATUS:
case SSH_FXP_HANDLE:
case SSH_FXP_DATA:
case SSH_FXP_ATTRS:
case SSH_FXP_NAME:
case SSH_FXP_EXTENDED_REPLY:
break;
default:
ssh_set_error(packet->sftp->session,
SSH_FATAL,
"Unknown packet type %d",
packet->type);
sftp_set_error(packet->sftp, SSH_FX_FAILURE);
return NULL;
}
msg = calloc(1, sizeof(struct sftp_message_struct));
if (msg == NULL) {
ssh_set_error_oom(sftp->session);
sftp_set_error(packet->sftp, SSH_FX_FAILURE);
return NULL;
}
msg->sftp = packet->sftp;
msg->packet_type = packet->type;
/* Move the payload from the packet to the message */
msg->payload = packet->payload;
packet->payload = NULL;
rc = ssh_buffer_unpack(msg->payload, "d", &msg->id);
if (rc != SSH_OK) {
ssh_set_error(packet->sftp->session, SSH_FATAL,
"Invalid packet %d: no ID", packet->type);
sftp_message_free(msg);
sftp_set_error(packet->sftp, SSH_FX_FAILURE);
return NULL;
}
SSH_LOG(SSH_LOG_PACKET,
"Packet with id %d type %d",
msg->id,
msg->packet_type);
return msg;
}
static int sftp_read_and_dispatch(sftp_session sftp)
{
sftp_packet packet = NULL;
sftp_message msg = NULL;
packet = sftp_packet_read(sftp);
if (packet == NULL) {
/* something nasty happened reading the packet */
return -1;
}
msg = sftp_get_message(packet);
if (msg == NULL) {
return -1;
}
if (sftp_enqueue(sftp, msg) < 0) {
sftp_message_free(msg);
return -1;
}
return 0;
}
void sftp_packet_free(sftp_packet packet)
{
if (packet == NULL) {
return;
}
SSH_BUFFER_FREE(packet->payload);
free(packet);
}
/* Initialize the sftp session with the server. */
int sftp_init(sftp_session sftp) {
sftp_packet packet = NULL;
ssh_buffer buffer = NULL;
char *ext_name = NULL;
char *ext_data = NULL;
uint32_t version;
int rc;
buffer = ssh_buffer_new();
if (buffer == NULL) {
ssh_set_error_oom(sftp->session);
sftp_set_error(sftp, SSH_FX_FAILURE);
return -1;
}
rc = ssh_buffer_pack(buffer, "d", LIBSFTP_VERSION);
if (rc != SSH_OK) {
ssh_set_error_oom(sftp->session);
SSH_BUFFER_FREE(buffer);
sftp_set_error(sftp, SSH_FX_FAILURE);
return -1;
}
if (sftp_packet_write(sftp, SSH_FXP_INIT, buffer) < 0) {
SSH_BUFFER_FREE(buffer);
return -1;
}
SSH_BUFFER_FREE(buffer);
packet = sftp_packet_read(sftp);
if (packet == NULL) {
return -1;
}
if (packet->type != SSH_FXP_VERSION) {
ssh_set_error(sftp->session, SSH_FATAL,
"Received a %d messages instead of SSH_FXP_VERSION", packet->type);
return -1;
}
/* TODO: are we sure there are 4 bytes ready? */
rc = ssh_buffer_unpack(packet->payload, "d", &version);
if (rc != SSH_OK){
sftp_set_error(sftp, SSH_FX_FAILURE);
return -1;
}
SSH_LOG(SSH_LOG_PROTOCOL,
"SFTP server version %d",
version);
rc = ssh_buffer_unpack(packet->payload, "s", &ext_name);
while (rc == SSH_OK) {
uint32_t count = sftp->ext->count;
char **tmp;
rc = ssh_buffer_unpack(packet->payload, "s", &ext_data);
if (rc == SSH_ERROR) {
break;
}
SSH_LOG(SSH_LOG_PROTOCOL,
"SFTP server extension: %s, version: %s",
ext_name, ext_data);
count++;
tmp = realloc(sftp->ext->name, count * sizeof(char *));
if (tmp == NULL) {
ssh_set_error_oom(sftp->session);
SAFE_FREE(ext_name);
SAFE_FREE(ext_data);
sftp_set_error(sftp, SSH_FX_FAILURE);
return -1;
}
tmp[count - 1] = ext_name;
sftp->ext->name = tmp;
tmp = realloc(sftp->ext->data, count * sizeof(char *));
if (tmp == NULL) {
ssh_set_error_oom(sftp->session);
SAFE_FREE(ext_name);
SAFE_FREE(ext_data);
sftp_set_error(sftp, SSH_FX_FAILURE);
return -1;
}
tmp[count - 1] = ext_data;
sftp->ext->data = tmp;
sftp->ext->count = count;
rc = ssh_buffer_unpack(packet->payload, "s", &ext_name);
}
sftp->version = sftp->server_version = (int)version;
return 0;
}
unsigned int sftp_extensions_get_count(sftp_session sftp) {
if (sftp == NULL || sftp->ext == NULL) {
return 0;
}
return sftp->ext->count;
}
const char *sftp_extensions_get_name(sftp_session sftp, unsigned int idx) {
if (sftp == NULL)
return NULL;
if (sftp->ext == NULL || sftp->ext->name == NULL) {
ssh_set_error_invalid(sftp->session);
return NULL;
}
if (idx > sftp->ext->count) {
ssh_set_error_invalid(sftp->session);
return NULL;
}
return sftp->ext->name[idx];
}
const char *sftp_extensions_get_data(sftp_session sftp, unsigned int idx) {
if (sftp == NULL)
return NULL;
if (sftp->ext == NULL || sftp->ext->name == NULL) {
ssh_set_error_invalid(sftp->session);
return NULL;
}
if (idx > sftp->ext->count) {
ssh_set_error_invalid(sftp->session);
return NULL;
}
return sftp->ext->data[idx];
}
int sftp_extension_supported(sftp_session sftp, const char *name,
const char *data) {
size_t i, n;
if (sftp == NULL || name == NULL || data == NULL) {
return 0;
}
n = sftp_extensions_get_count(sftp);
for (i = 0; i < n; i++) {
const char *ext_name = sftp_extensions_get_name(sftp, i);
const char *ext_data = sftp_extensions_get_data(sftp, i);
if (ext_name != NULL && ext_data != NULL &&
strcmp(ext_name, name) == 0 &&
strcmp(ext_data, data) == 0) {
return 1;
}
}
return 0;
}
static sftp_request_queue request_queue_new(sftp_message msg) {
sftp_request_queue queue = NULL;
queue = calloc(1, sizeof(struct sftp_request_queue_struct));
if (queue == NULL) {
ssh_set_error_oom(msg->sftp->session);
sftp_set_error(msg->sftp, SSH_FX_FAILURE);
return NULL;
}
queue->message = msg;
return queue;
}
static void request_queue_free(sftp_request_queue queue) {
if (queue == NULL) {
return;
}
ZERO_STRUCTP(queue);
SAFE_FREE(queue);
}
static int sftp_enqueue(sftp_session sftp, sftp_message msg) {
sftp_request_queue queue = NULL;
sftp_request_queue ptr;
queue = request_queue_new(msg);
if (queue == NULL) {
return -1;
}
SSH_LOG(SSH_LOG_PACKET,
"Queued msg id %d type %d",
msg->id, msg->packet_type);
if(sftp->queue == NULL) {
sftp->queue = queue;
} else {
ptr = sftp->queue;
while(ptr->next) {
ptr=ptr->next; /* find end of linked list */
}
ptr->next = queue; /* add it on bottom */
}
return 0;
}
/*
* Pulls a message from the queue based on the ID.
* Returns NULL if no message has been found.
*/
static sftp_message sftp_dequeue(sftp_session sftp, uint32_t id){
sftp_request_queue prev = NULL;
sftp_request_queue queue;
sftp_message msg;
if(sftp->queue == NULL) {
return NULL;
}
queue = sftp->queue;
while (queue) {
if(queue->message->id == id) {
/* remove from queue */
if (prev == NULL) {
sftp->queue = queue->next;
} else {
prev->next = queue->next;
}
msg = queue->message;
request_queue_free(queue);
SSH_LOG(SSH_LOG_PACKET,
"Dequeued msg id %d type %d",
msg->id,
msg->packet_type);
return msg;
}
prev = queue;
queue = queue->next;
}
return NULL;
}
/*
* Assigns a new SFTP ID for new requests and assures there is no collision
* between them.
* Returns a new ID ready to use in a request
*/
static inline uint32_t sftp_get_new_id(sftp_session session) {
return ++session->id_counter;
}
static sftp_status_message parse_status_msg(sftp_message msg){
sftp_status_message status;
int rc;
if (msg->packet_type != SSH_FXP_STATUS) {
ssh_set_error(msg->sftp->session, SSH_FATAL,
"Not a ssh_fxp_status message passed in!");
sftp_set_error(msg->sftp, SSH_FX_BAD_MESSAGE);
return NULL;
}
status = calloc(1, sizeof(struct sftp_status_message_struct));
if (status == NULL) {
ssh_set_error_oom(msg->sftp->session);
sftp_set_error(msg->sftp, SSH_FX_FAILURE);
return NULL;
}
status->id = msg->id;
rc = ssh_buffer_unpack(msg->payload, "d",
&status->status);
if (rc != SSH_OK){
SAFE_FREE(status);
ssh_set_error(msg->sftp->session, SSH_FATAL,
"Invalid SSH_FXP_STATUS message");
sftp_set_error(msg->sftp, SSH_FX_FAILURE);
return NULL;
}
rc = ssh_buffer_unpack(msg->payload, "ss",
&status->errormsg,
&status->langmsg);
if(rc != SSH_OK && msg->sftp->version >=3){
/* These are mandatory from version 3 */
SAFE_FREE(status);
ssh_set_error(msg->sftp->session, SSH_FATAL,
"Invalid SSH_FXP_STATUS message");
sftp_set_error(msg->sftp, SSH_FX_FAILURE);
return NULL;
}
if (status->errormsg == NULL)
status->errormsg = strdup("No error message in packet");
if (status->langmsg == NULL)
status->langmsg = strdup("");
if (status->errormsg == NULL || status->langmsg == NULL) {
ssh_set_error_oom(msg->sftp->session);
sftp_set_error(msg->sftp, SSH_FX_FAILURE);
status_msg_free(status);
return NULL;
}
return status;
}
static void status_msg_free(sftp_status_message status){
if (status == NULL) {
return;
}
SAFE_FREE(status->errormsg);
SAFE_FREE(status->langmsg);
SAFE_FREE(status);
}
static sftp_file parse_handle_msg(sftp_message msg){
sftp_file file;
if(msg->packet_type != SSH_FXP_HANDLE) {
ssh_set_error(msg->sftp->session, SSH_FATAL,
"Not a ssh_fxp_handle message passed in!");
return NULL;
}
file = calloc(1, sizeof(struct sftp_file_struct));
if (file == NULL) {
ssh_set_error_oom(msg->sftp->session);
sftp_set_error(msg->sftp, SSH_FX_FAILURE);
return NULL;
}
file->handle = ssh_buffer_get_ssh_string(msg->payload);
if (file->handle == NULL) {
ssh_set_error(msg->sftp->session, SSH_FATAL,
"Invalid SSH_FXP_HANDLE message");
SAFE_FREE(file);
sftp_set_error(msg->sftp, SSH_FX_FAILURE);
return NULL;