summaryrefslogtreecommitdiff
path: root/source3/lib/wb_reqtrans.c
blob: 78f806dc0d6ddc284d94b976afd844975745f902 (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
/*
   Unix SMB/CIFS implementation.

   Async transfer of winbindd_request and _response structs

   Copyright (C) Volker Lendecke 2008

     ** NOTE! The following LGPL license applies to the wbclient
     ** 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
   Library General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "replace.h"
#include "system/filesys.h"
#include "system/network.h"
#include <talloc.h>
#include <tevent.h>
#include "lib/async_req/async_sock.h"
#include "lib/util/tevent_unix.h"
#include "nsswitch/winbind_struct_protocol.h"
#include "nsswitch/libwbclient/wbclient.h"
#include "lib/wb_reqtrans.h"

/* can't use DEBUG here... */
#define DEBUG(a,b)

struct req_read_state {
	struct winbindd_request *wb_req;
	size_t max_extra_data;
	ssize_t ret;
};

static ssize_t wb_req_more(uint8_t *buf, size_t buflen, void *private_data);
static void wb_req_read_done(struct tevent_req *subreq);

struct tevent_req *wb_req_read_send(TALLOC_CTX *mem_ctx,
				    struct tevent_context *ev,
				    int fd, size_t max_extra_data)
{
	struct tevent_req *req, *subreq;
	struct req_read_state *state;

	req = tevent_req_create(mem_ctx, &state, struct req_read_state);
	if (req == NULL) {
		return NULL;
	}
	state->max_extra_data = max_extra_data;

	subreq = read_packet_send(state, ev, fd, 4, wb_req_more, state);
	if (tevent_req_nomem(subreq, req)) {
		return tevent_req_post(req, ev);
	}
	tevent_req_set_callback(subreq, wb_req_read_done, req);
	return req;
}

static ssize_t wb_req_more(uint8_t *buf, size_t buflen, void *private_data)
{
	struct req_read_state *state = talloc_get_type_abort(
		private_data, struct req_read_state);
	struct winbindd_request *req = (struct winbindd_request *)buf;

	if (buflen == 4) {
		if (req->length != sizeof(struct winbindd_request)) {
			DEBUG(0, ("wb_req_read_len: Invalid request size "
				  "received: %d (expected %d)\n",
				  (int)req->length,
				  (int)sizeof(struct winbindd_request)));
			return -1;
		}
		return sizeof(struct winbindd_request) - 4;
	}

	if (buflen > sizeof(struct winbindd_request)) {
		/* We've been here, we're done */
		return 0;
	}

	if ((state->max_extra_data != 0)
	    && (req->extra_len > state->max_extra_data)) {
		DEBUG(3, ("Got request with %d bytes extra data on "
			  "unprivileged socket\n", (int)req->extra_len));
		return -1;
	}

	return req->extra_len;
}

static void wb_req_read_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(
		subreq, struct tevent_req);
	struct req_read_state *state = tevent_req_data(
		req, struct req_read_state);
	int err;
	uint8_t *buf;

	state->ret = read_packet_recv(subreq, state, &buf, &err);
	TALLOC_FREE(subreq);
	if (state->ret == -1) {
		tevent_req_error(req, err);
		return;
	}

	state->wb_req = (struct winbindd_request *)buf;

	if (state->wb_req->extra_len != 0) {
		state->wb_req->extra_data.data =
			(char *)buf + sizeof(struct winbindd_request);
	} else {
		state->wb_req->extra_data.data = NULL;
	}
	tevent_req_done(req);
}

ssize_t wb_req_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
			 struct winbindd_request **preq, int *err)
{
	struct req_read_state *state = tevent_req_data(
		req, struct req_read_state);

	if (tevent_req_is_unix_error(req, err)) {
		return -1;
	}
	*preq = talloc_move(mem_ctx, &state->wb_req);
	return state->ret;
}

struct req_write_state {
	struct iovec iov[2];
	ssize_t ret;
};

static void wb_req_write_done(struct tevent_req *subreq);

struct tevent_req *wb_req_write_send(TALLOC_CTX *mem_ctx,
				     struct tevent_context *ev,
				     struct tevent_queue *queue, int fd,
				     struct winbindd_request *wb_req)
{
	struct tevent_req *req, *subreq;
	struct req_write_state *state;
	int count = 1;

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

	state->iov[0].iov_base = (void *)wb_req;
	state->iov[0].iov_len = sizeof(struct winbindd_request);

	if (wb_req->extra_len != 0) {
		state->iov[1].iov_base = (void *)wb_req->extra_data.data;
		state->iov[1].iov_len = wb_req->extra_len;
		count = 2;
	}

	subreq = writev_send(state, ev, queue, fd, true, state->iov, count);
	if (tevent_req_nomem(subreq, req)) {
		return tevent_req_post(req, ev);
	}
	tevent_req_set_callback(subreq, wb_req_write_done, req);
	return req;
}

static void wb_req_write_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(
		subreq, struct tevent_req);
	struct req_write_state *state = tevent_req_data(
		req, struct req_write_state);
	int err;

	state->ret = writev_recv(subreq, &err);
	TALLOC_FREE(subreq);
	if (state->ret < 0) {
		tevent_req_error(req, err);
		return;
	}
	tevent_req_done(req);
}

ssize_t wb_req_write_recv(struct tevent_req *req, int *err)
{
	struct req_write_state *state = tevent_req_data(
		req, struct req_write_state);

	if (tevent_req_is_unix_error(req, err)) {
		return -1;
	}
	return state->ret;
}

struct resp_read_state {
	struct winbindd_response *wb_resp;
	ssize_t ret;
};

static ssize_t wb_resp_more(uint8_t *buf, size_t buflen, void *private_data);
static void wb_resp_read_done(struct tevent_req *subreq);

struct tevent_req *wb_resp_read_send(TALLOC_CTX *mem_ctx,
				     struct tevent_context *ev, int fd)
{
	struct tevent_req *req, *subreq;
	struct resp_read_state *state;

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

	subreq = read_packet_send(state, ev, fd, 4, wb_resp_more, state);
	if (tevent_req_nomem(subreq, req)) {
		return tevent_req_post(req, ev);
	}
	tevent_req_set_callback(subreq, wb_resp_read_done, req);
	return req;
}

static ssize_t wb_resp_more(uint8_t *buf, size_t buflen, void *private_data)
{
	struct winbindd_response *resp = (struct winbindd_response *)buf;

	if (buflen == 4) {
		if (resp->length < sizeof(struct winbindd_response)) {
			DEBUG(0, ("wb_resp_read_len: Invalid response size "
				  "received: %d (expected at least%d)\n",
				  (int)resp->length,
				  (int)sizeof(struct winbindd_response)));
			return -1;
		}
	}
	return resp->length - buflen;
}

static void wb_resp_read_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(
		subreq, struct tevent_req);
	struct resp_read_state *state = tevent_req_data(
		req, struct resp_read_state);
	uint8_t *buf;
	int err;

	state->ret = read_packet_recv(subreq, state, &buf, &err);
	TALLOC_FREE(subreq);
	if (state->ret == -1) {
		tevent_req_error(req, err);
		return;
	}

	state->wb_resp = (struct winbindd_response *)buf;

	if (state->wb_resp->length > sizeof(struct winbindd_response)) {
		state->wb_resp->extra_data.data =
			(char *)buf + sizeof(struct winbindd_response);
	} else {
		state->wb_resp->extra_data.data = NULL;
	}
	tevent_req_done(req);
}

ssize_t wb_resp_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
			  struct winbindd_response **presp, int *err)
{
	struct resp_read_state *state = tevent_req_data(
		req, struct resp_read_state);

	if (tevent_req_is_unix_error(req, err)) {
		return -1;
	}
	*presp = talloc_move(mem_ctx, &state->wb_resp);
	return state->ret;
}

struct resp_write_state {
	struct iovec iov[2];
	ssize_t ret;
};

static void wb_resp_write_done(struct tevent_req *subreq);

struct tevent_req *wb_resp_write_send(TALLOC_CTX *mem_ctx,
				      struct tevent_context *ev,
				      struct tevent_queue *queue, int fd,
				      struct winbindd_response *wb_resp)
{
	struct tevent_req *req, *subreq;
	struct resp_write_state *state;
	int count = 1;

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

	state->iov[0].iov_base = (void *)wb_resp;
	state->iov[0].iov_len = sizeof(struct winbindd_response);

	if (wb_resp->length > sizeof(struct winbindd_response)) {
		state->iov[1].iov_base = (void *)wb_resp->extra_data.data;
		state->iov[1].iov_len =
			wb_resp->length - sizeof(struct winbindd_response);
		count = 2;
	}

	subreq = writev_send(state, ev, queue, fd, true, state->iov, count);
	if (tevent_req_nomem(subreq, req)) {
		return tevent_req_post(req, ev);
	}
	tevent_req_set_callback(subreq, wb_resp_write_done, req);
	return req;
}

static void wb_resp_write_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(
		subreq, struct tevent_req);
	struct resp_write_state *state = tevent_req_data(
		req, struct resp_write_state);
	int err;

	state->ret = writev_recv(subreq, &err);
	TALLOC_FREE(subreq);
	if (state->ret < 0) {
		tevent_req_error(req, err);
		return;
	}
	tevent_req_done(req);
}

ssize_t wb_resp_write_recv(struct tevent_req *req, int *err)
{
	struct resp_write_state *state = tevent_req_data(
		req, struct resp_write_state);

	if (tevent_req_is_unix_error(req, err)) {
		return -1;
	}
	return state->ret;
}

struct wb_simple_trans_state {
	struct tevent_context *ev;
	int fd;
	struct winbindd_response *wb_resp;
};

static void wb_simple_trans_write_done(struct tevent_req *subreq);
static void wb_simple_trans_read_done(struct tevent_req *subreq);

struct tevent_req *wb_simple_trans_send(TALLOC_CTX *mem_ctx,
					struct tevent_context *ev,
					struct tevent_queue *queue, int fd,
					struct winbindd_request *wb_req)
{
	struct tevent_req *req, *subreq;
	struct wb_simple_trans_state *state;

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

	wb_req->length = sizeof(struct winbindd_request);

	state->ev = ev;
	state->fd = fd;

	subreq = wb_req_write_send(state, ev, queue, fd, wb_req);
	if (tevent_req_nomem(subreq, req)) {
		return tevent_req_post(req, ev);
	}
	tevent_req_set_callback(subreq, wb_simple_trans_write_done, req);

	return req;
}

static void wb_simple_trans_write_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(
		subreq, struct tevent_req);
	struct wb_simple_trans_state *state = tevent_req_data(
		req, struct wb_simple_trans_state);
	ssize_t ret;
	int err;

	ret = wb_req_write_recv(subreq, &err);
	TALLOC_FREE(subreq);
	if (ret == -1) {
		tevent_req_error(req, err);
		return;
	}
	subreq = wb_resp_read_send(state, state->ev, state->fd);
	if (tevent_req_nomem(subreq, req)) {
		return;
	}
	tevent_req_set_callback(subreq, wb_simple_trans_read_done, req);
}

static void wb_simple_trans_read_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(
		subreq, struct tevent_req);
	struct wb_simple_trans_state *state = tevent_req_data(
		req, struct wb_simple_trans_state);
	ssize_t ret;
	int err;

	ret = wb_resp_read_recv(subreq, state, &state->wb_resp, &err);
	TALLOC_FREE(subreq);
	if (ret == -1) {
		tevent_req_error(req, err);
		return;
	}

	tevent_req_done(req);
}

int wb_simple_trans_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
			 struct winbindd_response **presponse, int *err)
{
	struct wb_simple_trans_state *state = tevent_req_data(
		req, struct wb_simple_trans_state);

	if (tevent_req_is_unix_error(req, err)) {
		return -1;
	}
	*presponse = talloc_move(mem_ctx, &state->wb_resp);
	return 0;
}