summaryrefslogtreecommitdiffstats
path: root/lib/tsocket/tsocket.c
blob: b8dd6c893662c47cd8973faf8f7e72646ec45c15 (plain)
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
/*
   Unix SMB/CIFS implementation.

   Copyright (C) Stefan Metzmacher 2009

     ** NOTE! The following LGPL license applies to the tsocket
     ** library. This does NOT imply that all of Samba is released
     ** under the LGPL

   This 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 3 of the License, or (at your option) any later version.

   This 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 this library; if not, see <http://www.gnu.org/licenses/>.
*/

#include "replace.h"
#include "system/filesys.h"
#include "tsocket.h"
#include "tsocket_internal.h"

int tsocket_simple_int_recv(struct tevent_req *req, int *perrno)
{
	enum tevent_req_state state;
	uint64_t error;

	if (!tevent_req_is_error(req, &state, &error)) {
		return 0;
	}

	switch (state) {
	case TEVENT_REQ_NO_MEMORY:
		*perrno = ENOMEM;
		return -1;
	case TEVENT_REQ_TIMED_OUT:
		*perrno = ETIMEDOUT;
		return -1;
	case TEVENT_REQ_USER_ERROR:
		*perrno = (int)error;
		return -1;
	default:
		*perrno = EIO;
		return -1;
	}

	*perrno = EIO;
	return -1;
}

struct tsocket_address *_tsocket_address_create(TALLOC_CTX *mem_ctx,
						const struct tsocket_address_ops *ops,
						void *pstate,
						size_t psize,
						const char *type,
						const char *location)
{
	void **ppstate = (void **)pstate;
	struct tsocket_address *addr;

	addr = talloc_zero(mem_ctx, struct tsocket_address);
	if (!addr) {
		return NULL;
	}
	addr->ops = ops;
	addr->location = location;
	addr->private_data = talloc_size(addr, psize);
	if (!addr->private_data) {
		talloc_free(addr);
		return NULL;
	}
	talloc_set_name_const(addr->private_data, type);

	*ppstate = addr->private_data;
	return addr;
}

char *tsocket_address_string(const struct tsocket_address *addr,
			     TALLOC_CTX *mem_ctx)
{
	if (!addr) {
		return talloc_strdup(mem_ctx, "NULL");
	}
	return addr->ops->string(addr, mem_ctx);
}

struct tsocket_address *_tsocket_address_copy(const struct tsocket_address *addr,
					      TALLOC_CTX *mem_ctx,
					      const char *location)
{
	return addr->ops->copy(addr, mem_ctx, location);
}

struct tdgram_context {
	const char *location;
	const struct tdgram_context_ops *ops;
	void *private_data;

	struct tevent_req *recvfrom_req;
	struct tevent_req *sendto_req;
};

static int tdgram_context_destructor(struct tdgram_context *dgram)
{
	if (dgram->recvfrom_req) {
		tevent_req_received(dgram->recvfrom_req);
	}

	if (dgram->sendto_req) {
		tevent_req_received(dgram->sendto_req);
	}

	return 0;
}

struct tdgram_context *_tdgram_context_create(TALLOC_CTX *mem_ctx,
					const struct tdgram_context_ops *ops,
					void *pstate,
					size_t psize,
					const char *type,
					const char *location)
{
	struct tdgram_context *dgram;
	void **ppstate = (void **)pstate;
	void *state;

	dgram = talloc(mem_ctx, struct tdgram_context);
	if (dgram == NULL) {
		return NULL;
	}
	dgram->location		= location;
	dgram->ops		= ops;
	dgram->recvfrom_req	= NULL;
	dgram->sendto_req	= NULL;

	state = talloc_size(dgram, psize);
	if (state == NULL) {
		talloc_free(dgram);
		return NULL;
	}
	talloc_set_name_const(state, type);

	dgram->private_data = state;

	talloc_set_destructor(dgram, tdgram_context_destructor);

	*ppstate = state;
	return dgram;
}

void *_tdgram_context_data(struct tdgram_context *dgram)
{
	return dgram->private_data;
}

struct tdgram_recvfrom_state {
	const struct tdgram_context_ops *ops;
	struct tdgram_context *dgram;
	uint8_t *buf;
	size_t len;
	struct tsocket_address *src;
};

static int tdgram_recvfrom_destructor(struct tdgram_recvfrom_state *state)
{
	if (state->dgram) {
		state->dgram->recvfrom_req = NULL;
	}

	return 0;
}

static void tdgram_recvfrom_done(struct tevent_req *subreq);

struct tevent_req *tdgram_recvfrom_send(TALLOC_CTX *mem_ctx,
					struct tevent_context *ev,
					struct tdgram_context *dgram)
{
	struct tevent_req *req;
	struct tdgram_recvfrom_state *state;
	struct tevent_req *subreq;

	req = tevent_req_create(mem_ctx, &state,
				struct tdgram_recvfrom_state);
	if (req == NULL) {
		return NULL;
	}

	state->ops = dgram->ops;
	state->dgram = dgram;
	state->buf = NULL;
	state->len = 0;
	state->src = NULL;

	if (dgram->recvfrom_req) {
		tevent_req_error(req, EBUSY);
		goto post;
	}
	dgram->recvfrom_req = req;

	talloc_set_destructor(state, tdgram_recvfrom_destructor);

	subreq = state->ops->recvfrom_send(state, ev, dgram);
	if (tevent_req_nomem(subreq, req)) {
		goto post;
	}
	tevent_req_set_callback(subreq, tdgram_recvfrom_done, req);

	return req;

 post:
	tevent_req_post(req, ev);
	return req;
}

static void tdgram_recvfrom_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(subreq,
				 struct tevent_req);
	struct tdgram_recvfrom_state *state = tevent_req_data(req,
					      struct tdgram_recvfrom_state);
	ssize_t ret;
	int sys_errno;

	ret = state->ops->recvfrom_recv(subreq, &sys_errno, state,
					&state->buf, &state->src);
	if (ret == -1) {
		tevent_req_error(req, sys_errno);
		return;
	}

	state->len = ret;

	tevent_req_done(req);
}

ssize_t tdgram_recvfrom_recv(struct tevent_req *req,
			     int *perrno,
			     TALLOC_CTX *mem_ctx,
			     uint8_t **buf,
			     struct tsocket_address **src)
{
	struct tdgram_recvfrom_state *state = tevent_req_data(req,
					      struct tdgram_recvfrom_state);
	ssize_t ret;

	ret = tsocket_simple_int_recv(req, perrno);
	if (ret == 0) {
		*buf = talloc_move(mem_ctx, &state->buf);
		ret = state->len;
		if (src) {
			*src = talloc_move(mem_ctx, &state->src);
		}
	}

	tevent_req_received(req);
	return ret;
}

struct tdgram_sendto_state {
	const struct tdgram_context_ops *ops;
	struct tdgram_context *dgram;
	ssize_t ret;
};

static int tdgram_sendto_destructor(struct tdgram_sendto_state *state)
{
	if (state->dgram) {
		state->dgram->sendto_req = NULL;
	}

	return 0;
}

static void tdgram_sendto_done(struct tevent_req *subreq);

struct tevent_req *tdgram_sendto_send(TALLOC_CTX *mem_ctx,
				      struct tevent_context *ev,
				      struct tdgram_context *dgram,
				      const uint8_t *buf, size_t len,
				      const struct tsocket_address *dst)
{
	struct tevent_req *req;
	struct tdgram_sendto_state *state;
	struct tevent_req *subreq;

	req = tevent_req_create(mem_ctx, &state,
				struct tdgram_sendto_state);
	if (req == NULL) {
		return NULL;
	}

	state->ops = dgram->ops;
	state->dgram = dgram;
	state->ret = -1;

	if (len == 0) {
		tevent_req_error(req, EINVAL);
		goto post;
	}

	if (dgram->sendto_req) {
		tevent_req_error(req, EBUSY);
		goto post;
	}
	dgram->sendto_req = req;

	talloc_set_destructor(state, tdgram_sendto_destructor);

	subreq = state->ops->sendto_send(state, ev, dgram,
					 buf, len, dst);
	if (tevent_req_nomem(subreq, req)) {
		goto post;
	}
	tevent_req_set_callback(subreq, tdgram_sendto_done, req);

	return req;

 post:
	tevent_req_post(req, ev);
	return req;
}

static void tdgram_sendto_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(subreq,
				 struct tevent_req);
	struct tdgram_sendto_state *state = tevent_req_data(req,
					    struct tdgram_sendto_state);
	ssize_t ret;
	int sys_errno;

	ret = state->ops->sendto_recv(subreq, &sys_errno);
	if (ret == -1) {
		tevent_req_error(req, sys_errno);
		return;
	}

	state->ret = ret;

	tevent_req_done(req);
}

ssize_t tdgram_sendto_recv(struct tevent_req *req,
			   int *perrno)
{
	struct tdgram_sendto_state *state = tevent_req_data(req,
					    struct tdgram_sendto_state);
	ssize_t ret;

	ret = tsocket_simple_int_recv(req, perrno);
	if (ret == 0) {
		ret = state->ret;
	}

	tevent_req_received(req);
	return ret;
}

struct tdgram_disconnect_state {
	const struct tdgram_context_ops *ops;
};

static void tdgram_disconnect_done(struct tevent_req *subreq);

struct tevent_req *tdgram_disconnect_send(TALLOC_CTX *mem_ctx,
					  struct tevent_context *ev,
					  struct tdgram_context *dgram)
{
	struct tevent_req *req;
	struct tdgram_disconnect_state *state;
	struct tevent_req *subreq;

	req = tevent_req_create(mem_ctx, &state,
				struct tdgram_disconnect_state);
	if (req == NULL) {
		return NULL;
	}

	state->ops = dgram->ops;

	if (dgram->recvfrom_req || dgram->sendto_req) {
		tevent_req_error(req, EBUSY);
		goto post;
	}

	subreq = state->ops->disconnect_send(state, ev, dgram);
	if (tevent_req_nomem(subreq, req)) {
		goto post;
	}
	tevent_req_set_callback(subreq, tdgram_disconnect_done, req);

	return req;

 post:
	tevent_req_post(req, ev);
	return req;
}

static void tdgram_disconnect_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(subreq,
				 struct tevent_req);
	struct tdgram_disconnect_state *state = tevent_req_data(req,
						struct tdgram_disconnect_state);
	int ret;
	int sys_errno;

	ret = state->ops->disconnect_recv(subreq, &sys_errno);
	if (ret == -1) {
		tevent_req_error(req, sys_errno);
		return;
	}

	tevent_req_done(req);
}

int tdgram_disconnect_recv(struct tevent_req *req,
			   int *perrno)
{
	int ret;

	ret = tsocket_simple_int_recv(req, perrno);

	tevent_req_received(req);
	return ret;
}

struct tstream_context {
	const char *location;
	const struct tstream_context_ops *ops;
	void *private_data;

	struct tevent_req *readv_req;
	struct tevent_req *writev_req;
};

static int tstream_context_destructor(struct tstream_context *stream)
{
	if (stream->readv_req) {
		tevent_req_received(stream->readv_req);
	}

	if (stream->writev_req) {
		tevent_req_received(stream->writev_req);
	}

	return 0;
}

struct tstream_context *_tstream_context_create(TALLOC_CTX *mem_ctx,
					const struct tstream_context_ops *ops,
					void *pstate,
					size_t psize,
					const char *type,
					const char *location)
{
	struct tstream_context *stream;
	void **ppstate = (void **)pstate;
	void *state;

	stream = talloc(mem_ctx, struct tstream_context);
	if (stream == NULL) {
		return NULL;
	}
	stream->location	= location;
	stream->ops		= ops;
	stream->readv_req	= NULL;
	stream->writev_req	= NULL;

	state = talloc_size(stream, psize);
	if (state == NULL) {
		talloc_free(stream);
		return NULL;
	}
	talloc_set_name_const(state, type);

	stream->private_data = state;

	talloc_set_destructor(stream, tstream_context_destructor);

	*ppstate = state;
	return stream;
}

void *_tstream_context_data(struct tstream_context *stream)
{
	return stream->private_data;
}

ssize_t tstream_pending_bytes(struct tstream_context *stream)
{
	return stream->ops->pending_bytes(stream);
}

struct tstream_readv_state {
	const struct tstream_context_ops *ops;
	struct tstream_context *stream;
	int ret;
};

static int tstream_readv_destructor(struct tstream_readv_state *state)
{
	if (state->stream) {
		state->stream->readv_req = NULL;
	}

	return 0;
}

static void tstream_readv_done(struct tevent_req *subreq);

struct tevent_req *tstream_readv_send(TALLOC_CTX *mem_ctx,
				      struct tevent_context *ev,
				      struct tstream_context *stream,
				      struct iovec *vector,
				      size_t count)
{
	struct tevent_req *req;
	struct tstream_readv_state *state;
	struct tevent_req *subreq;
	int to_read = 0;
	size_t i;

	req = tevent_req_create(mem_ctx, &state,
				struct tstream_readv_state);
	if (req == NULL) {
		return NULL;
	}

	state->ops = stream->ops;
	state->stream = stream;
	state->ret = -1;

	/* first check if the input is ok */
#ifdef IOV_MAX
	if (count > IOV_MAX) {
		tevent_req_error(req, EMSGSIZE);
		goto post;
	}
#endif

	for (i=0; i < count; i++) {
		int tmp = to_read;
		tmp += vector[i].iov_len;

		if (tmp < to_read) {
			tevent_req_error(req, EMSGSIZE);
			goto post;
		}

		to_read = tmp;
	}

	if (to_read == 0) {
		tevent_req_error(req, EINVAL);
		goto post;
	}

	if (stream->readv_req) {
		tevent_req_error(req, EBUSY);
		goto post;
	}
	stream->readv_req = req;

	talloc_set_destructor(state, tstream_readv_destructor);

	subreq = state->ops->readv_send(state, ev, stream, vector, count);
	if (tevent_req_nomem(subreq, req)) {
		goto post;
	}
	tevent_req_set_callback(subreq, tstream_readv_done, req);

	return req;

 post:
	tevent_req_post(req, ev);
	return req;
}

static void tstream_readv_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(subreq,
				 struct tevent_req);
	struct tstream_readv_state *state = tevent_req_data(req,
					    struct tstream_readv_state);
	ssize_t ret;
	int sys_errno;

	ret = state->ops->readv_recv(subreq, &sys_errno);
	TALLOC_FREE(subreq);
	if (ret == -1) {
		tevent_req_error(req, sys_errno);
		return;
	}

	state->ret = ret;

	tevent_req_done(req);
}

int tstream_readv_recv(struct tevent_req *req,
		       int *perrno)
{
	struct tstream_readv_state *state = tevent_req_data(req,
					    struct tstream_readv_state);
	int ret;

	ret = tsocket_simple_int_recv(req, perrno);
	if (ret == 0) {
		ret = state->ret;
	}

	tevent_req_received(req);
	return ret;
}

struct tstream_writev_state {
	const struct tstream_context_ops *ops;
	struct tstream_context *stream;
	int ret;
};

static int tstream_writev_destructor(struct tstream_writev_state *state)
{
	if (state->stream) {
		state->stream->writev_req = NULL;
	}

	return 0;
}

static void tstream_writev_done(struct tevent_req *subreq);

struct tevent_req *tstream_writev_send(TALLOC_CTX *mem_ctx,
				       struct tevent_context *ev,
				       struct tstream_context *stream,
				       const struct iovec *vector,
				       size_t count)
{
	struct tevent_req *req;
	struct tstream_writev_state *state;
	struct tevent_req *subreq;
	int to_write = 0;
	size_t i;

	req = tevent_req_create(mem_ctx, &state,
				struct tstream_writev_state);
	if (req == NULL) {
		return NULL;
	}

	state->ops = stream->ops;
	state->stream = stream;
	state->ret = -1;

	/* first check if the input is ok */
#ifdef IOV_MAX
	if (count > IOV_MAX) {
		tevent_req_error(req, EMSGSIZE);
		goto post;
	}
#endif

	for (i=0; i < count; i++) {
		int tmp = to_write;
		tmp += vector[i].iov_len;

		if (tmp < to_write) {
			tevent_req_error(req, EMSGSIZE);
			goto post;
		}

		to_write = tmp;
	}

	if (to_write == 0) {
		tevent_req_error(req, EINVAL);
		goto post;
	}

	if (stream->writev_req) {
		tevent_req_error(req, EBUSY);
		goto post;
	}
	stream->writev_req = req;

	talloc_set_destructor(state, tstream_writev_destructor);

	subreq = state->ops->writev_send(state, ev, stream, vector, count);
	if (tevent_req_nomem(subreq, req)) {
		goto post;
	}
	tevent_req_set_callback(subreq, tstream_writev_done, req);

	return req;

 post:
	tevent_req_post(req, ev);
	return req;
}

static void tstream_writev_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(subreq,
				 struct tevent_req);
	struct tstream_writev_state *state = tevent_req_data(req,
					     struct tstream_writev_state);
	ssize_t ret;
	int sys_errno;

	ret = state->ops->writev_recv(subreq, &sys_errno);
	if (ret == -1) {
		tevent_req_error(req, sys_errno);
		return;
	}

	state->ret = ret;

	tevent_req_done(req);
}

int tstream_writev_recv(struct tevent_req *req,
		       int *perrno)
{
	struct tstream_writev_state *state = tevent_req_data(req,
					     struct tstream_writev_state);
	int ret;

	ret = tsocket_simple_int_recv(req, perrno);
	if (ret == 0) {
		ret = state->ret;
	}

	tevent_req_received(req);
	return ret;
}

struct tstream_disconnect_state {
	const struct tstream_context_ops *ops;
};

static void tstream_disconnect_done(struct tevent_req *subreq);

struct tevent_req *tstream_disconnect_send(TALLOC_CTX *mem_ctx,
					   struct tevent_context *ev,
					   struct tstream_context *stream)
{
	struct tevent_req *req;
	struct tstream_disconnect_state *state;
	struct tevent_req *subreq;

	req = tevent_req_create(mem_ctx, &state,
				struct tstream_disconnect_state);
	if (req == NULL) {
		return NULL;
	}

	state->ops = stream->ops;

	if (stream->readv_req || stream->writev_req) {
		tevent_req_error(req, EBUSY);
		goto post;
	}

	subreq = state->ops->disconnect_send(state, ev, stream);
	if (tevent_req_nomem(subreq, req)) {
		goto post;
	}
	tevent_req_set_callback(subreq, tstream_disconnect_done, req);

	return req;

 post:
	tevent_req_post(req, ev);
	return req;
}

static void tstream_disconnect_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(subreq,
				 struct tevent_req);
	struct tstream_disconnect_state *state = tevent_req_data(req,
						 struct tstream_disconnect_state);
	int ret;
	int sys_errno;

	ret = state->ops->disconnect_recv(subreq, &sys_errno);
	if (ret == -1) {
		tevent_req_error(req, sys_errno);
		return;
	}

	tevent_req_done(req);
}

int tstream_disconnect_recv(struct tevent_req *req,
			   int *perrno)
{
	int ret;

	ret = tsocket_simple_int_recv(req, perrno);

	tevent_req_received(req);
	return ret;
}