summaryrefslogtreecommitdiff
path: root/lib/tsocket/tsocket.c
blob: 8e97997d8582c5aca0e370f86ffbc4f032a9ccf6 (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
/*
   Unix SMB/CIFS implementation.

   Copyright (C) Stefan Metzmacher 2009

     ** NOTE! The following LGPL license applies to the tevent
     ** 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/network.h"
#include "tsocket.h"
#include "tsocket_internal.h"

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 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;

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

	dgram->private_data = state;

	*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;
	uint8_t *buf;
	size_t len;
	struct tsocket_address *src;
};

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;

	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;
	ssize_t ret;
};

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->ret = -1;

	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;

	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 tdgram_sendto_queue_state {
	/* this structs are owned by the caller */
	struct {
		struct tevent_context *ev;
		struct tdgram_context *dgram;
		const uint8_t *buf;
		size_t len;
		const struct tsocket_address *dst;
	} caller;
	ssize_t ret;
};

static void tdgram_sendto_queue_trigger(struct tevent_req *req,
					 void *private_data);
static void tdgram_sendto_queue_done(struct tevent_req *subreq);

/**
 * @brief Queue a dgram blob for sending through the socket
 * @param[in] mem_ctx	The memory context for the result
 * @param[in] ev	The event context the operation should work on
 * @param[in] dgram	The tdgram_context to send the message buffer
 * @param[in] queue	The existing dgram queue
 * @param[in] buf	The message buffer
 * @param[in] len	The message length
 * @param[in] dst	The destination socket address
 * @retval		The async request handle
 *
 * This function queues a blob for sending to destination through an existing
 * dgram socket. The async callback is triggered when the whole blob is
 * delivered to the underlying system socket.
 *
 * The caller needs to make sure that all non-scalar input parameters hang
 * arround for the whole lifetime of the request.
 */
struct tevent_req *tdgram_sendto_queue_send(TALLOC_CTX *mem_ctx,
					    struct tevent_context *ev,
					    struct tdgram_context *dgram,
					    struct tevent_queue *queue,
					    const uint8_t *buf,
					    size_t len,
					    struct tsocket_address *dst)
{
	struct tevent_req *req;
	struct tdgram_sendto_queue_state *state;
	bool ok;

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

	state->caller.ev	= ev;
	state->caller.dgram	= dgram;
	state->caller.buf	= buf;
	state->caller.len	= len;
	state->caller.dst	= dst;
	state->ret		= -1;

	ok = tevent_queue_add(queue,
			      ev,
			      req,
			      tdgram_sendto_queue_trigger,
			      NULL);
	if (!ok) {
		tevent_req_nomem(NULL, req);
		goto post;
	}

	return req;

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

static void tdgram_sendto_queue_trigger(struct tevent_req *req,
					 void *private_data)
{
	struct tdgram_sendto_queue_state *state = tevent_req_data(req,
					struct tdgram_sendto_queue_state);
	struct tevent_req *subreq;

	subreq = tdgram_sendto_send(state,
				    state->caller.ev,
				    state->caller.dgram,
				    state->caller.buf,
				    state->caller.len,
				    state->caller.dst);
	if (tevent_req_nomem(subreq, req)) {
		return;
	}
	tevent_req_set_callback(subreq, tdgram_sendto_queue_done, req);
}

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

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

	tevent_req_done(req);
}

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

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

	tevent_req_received(req);
	return ret;
}