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
|
/*
Unix SMB/CIFS implementation.
async socket syscalls
Copyright (C) Volker Lendecke 2008
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "lib/talloc/talloc.h"
#include "lib/tevent/tevent.h"
#include "lib/async_req/async_sock.h"
#include "lib/util/tevent_unix.h"
#include <fcntl.h>
#ifndef TALLOC_FREE
#define TALLOC_FREE(ctx) do { talloc_free(ctx); ctx=NULL; } while(0)
#endif
struct async_send_state {
int fd;
const void *buf;
size_t len;
int flags;
ssize_t sent;
};
static void async_send_handler(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *private_data);
struct tevent_req *async_send_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
int fd, const void *buf, size_t len,
int flags)
{
struct tevent_req *result;
struct async_send_state *state;
struct tevent_fd *fde;
result = tevent_req_create(mem_ctx, &state, struct async_send_state);
if (result == NULL) {
return result;
}
state->fd = fd;
state->buf = buf;
state->len = len;
state->flags = flags;
fde = tevent_add_fd(ev, state, fd, TEVENT_FD_WRITE, async_send_handler,
result);
if (fde == NULL) {
TALLOC_FREE(result);
return NULL;
}
return result;
}
static void async_send_handler(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *private_data)
{
struct tevent_req *req = talloc_get_type_abort(
private_data, struct tevent_req);
struct async_send_state *state =
tevent_req_data(req, struct async_send_state);
state->sent = send(state->fd, state->buf, state->len, state->flags);
if (state->sent == -1) {
tevent_req_error(req, errno);
return;
}
tevent_req_done(req);
}
ssize_t async_send_recv(struct tevent_req *req, int *perrno)
{
struct async_send_state *state =
tevent_req_data(req, struct async_send_state);
if (tevent_req_is_unix_error(req, perrno)) {
return -1;
}
return state->sent;
}
struct async_recv_state {
int fd;
void *buf;
size_t len;
int flags;
ssize_t received;
};
static void async_recv_handler(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *private_data);
struct tevent_req *async_recv_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
int fd, void *buf, size_t len, int flags)
{
struct tevent_req *result;
struct async_recv_state *state;
struct tevent_fd *fde;
result = tevent_req_create(mem_ctx, &state, struct async_recv_state);
if (result == NULL) {
return result;
}
state->fd = fd;
state->buf = buf;
state->len = len;
state->flags = flags;
fde = tevent_add_fd(ev, state, fd, TEVENT_FD_READ, async_recv_handler,
result);
if (fde == NULL) {
TALLOC_FREE(result);
return NULL;
}
return result;
}
static void async_recv_handler(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *private_data)
{
struct tevent_req *req = talloc_get_type_abort(
private_data, struct tevent_req);
struct async_recv_state *state =
tevent_req_data(req, struct async_recv_state);
state->received = recv(state->fd, state->buf, state->len,
state->flags);
if (state->received == -1) {
tevent_req_error(req, errno);
return;
}
tevent_req_done(req);
}
ssize_t async_recv_recv(struct tevent_req *req, int *perrno)
{
struct async_recv_state *state =
tevent_req_data(req, struct async_recv_state);
if (tevent_req_is_unix_error(req, perrno)) {
return -1;
}
return state->received;
}
struct async_connect_state {
int fd;
int result;
int sys_errno;
long old_sockflags;
};
static void async_connect_connected(struct tevent_context *ev,
struct tevent_fd *fde, uint16_t flags,
void *priv);
/**
* @brief async version of connect(2)
* @param[in] mem_ctx The memory context to hang the result off
* @param[in] ev The event context to work from
* @param[in] fd The socket to recv from
* @param[in] address Where to connect?
* @param[in] address_len Length of *address
* @retval The async request
*
* This function sets the socket into non-blocking state to be able to call
* connect in an async state. This will be reset when the request is finished.
*/
struct tevent_req *async_connect_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
int fd, const struct sockaddr *address,
socklen_t address_len)
{
struct tevent_req *result;
struct async_connect_state *state;
struct tevent_fd *fde;
result = tevent_req_create(
mem_ctx, &state, struct async_connect_state);
if (result == NULL) {
return NULL;
}
/**
* We have to set the socket to nonblocking for async connect(2). Keep
* the old sockflags around.
*/
state->fd = fd;
state->sys_errno = 0;
state->old_sockflags = fcntl(fd, F_GETFL, 0);
if (state->old_sockflags == -1) {
goto post_errno;
}
set_blocking(fd, false);
state->result = connect(fd, address, address_len);
if (state->result == 0) {
tevent_req_done(result);
goto done;
}
/**
* A number of error messages show that something good is progressing
* and that we have to wait for readability.
*
* If none of them are present, bail out.
*/
if (!(errno == EINPROGRESS || errno == EALREADY ||
#ifdef EISCONN
errno == EISCONN ||
#endif
errno == EAGAIN || errno == EINTR)) {
state->sys_errno = errno;
goto post_errno;
}
fde = tevent_add_fd(ev, state, fd, TEVENT_FD_READ | TEVENT_FD_WRITE,
async_connect_connected, result);
if (fde == NULL) {
state->sys_errno = ENOMEM;
goto post_errno;
}
return result;
post_errno:
tevent_req_error(result, state->sys_errno);
done:
fcntl(fd, F_SETFL, state->old_sockflags);
return tevent_req_post(result, ev);
}
/**
* fde event handler for connect(2)
* @param[in] ev The event context that sent us here
* @param[in] fde The file descriptor event associated with the connect
* @param[in] flags Indicate read/writeability of the socket
* @param[in] priv private data, "struct async_req *" in this case
*/
static void async_connect_connected(struct tevent_context *ev,
struct tevent_fd *fde, uint16_t flags,
void *priv)
{
struct tevent_req *req = talloc_get_type_abort(
priv, struct tevent_req);
struct async_connect_state *state =
tevent_req_data(req, struct async_connect_state);
TALLOC_FREE(fde);
/*
* Stevens, Network Programming says that if there's a
* successful connect, the socket is only writable. Upon an
* error, it's both readable and writable.
*/
if ((flags & (TEVENT_FD_READ|TEVENT_FD_WRITE))
== (TEVENT_FD_READ|TEVENT_FD_WRITE)) {
int sockerr;
socklen_t err_len = sizeof(sockerr);
if (getsockopt(state->fd, SOL_SOCKET, SO_ERROR,
(void *)&sockerr, &err_len) == 0) {
errno = sockerr;
}
state->sys_errno = errno;
DEBUG(10, ("connect returned %s\n", strerror(errno)));
fcntl(state->fd, F_SETFL, state->old_sockflags);
tevent_req_error(req, state->sys_errno);
return;
}
state->sys_errno = 0;
tevent_req_done(req);
}
int async_connect_recv(struct tevent_req *req, int *perrno)
{
struct async_connect_state *state =
tevent_req_data(req, struct async_connect_state);
int err;
fcntl(state->fd, F_SETFL, state->old_sockflags);
if (tevent_req_is_unix_error(req, &err)) {
*perrno = err;
return -1;
}
if (state->sys_errno == 0) {
return 0;
}
*perrno = state->sys_errno;
return -1;
}
struct writev_state {
struct tevent_context *ev;
int fd;
struct iovec *iov;
int count;
size_t total_size;
uint16_t flags;
};
static void writev_trigger(struct tevent_req *req, void *private_data);
static void writev_handler(struct tevent_context *ev, struct tevent_fd *fde,
uint16_t flags, void *private_data);
struct tevent_req *writev_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
struct tevent_queue *queue, int fd,
bool err_on_readability,
struct iovec *iov, int count)
{
struct tevent_req *req;
struct writev_state *state;
req = tevent_req_create(mem_ctx, &state, struct writev_state);
if (req == NULL) {
return NULL;
}
state->ev = ev;
state->fd = fd;
state->total_size = 0;
state->count = count;
state->iov = (struct iovec *)talloc_memdup(
state, iov, sizeof(struct iovec) * count);
if (state->iov == NULL) {
goto fail;
}
state->flags = TEVENT_FD_WRITE;
if (err_on_readability) {
state->flags |= TEVENT_FD_READ;
}
if (queue == NULL) {
struct tevent_fd *fde;
fde = tevent_add_fd(state->ev, state, state->fd,
state->flags, writev_handler, req);
if (tevent_req_nomem(fde, req)) {
return tevent_req_post(req, ev);
}
return req;
}
if (!tevent_queue_add(queue, ev, req, writev_trigger, NULL)) {
goto fail;
}
return req;
fail:
TALLOC_FREE(req);
return NULL;
}
static void writev_trigger(struct tevent_req *req, void *private_data)
{
struct writev_state *state = tevent_req_data(req, struct writev_state);
struct tevent_fd *fde;
fde = tevent_add_fd(state->ev, state, state->fd, state->flags,
writev_handler, req);
if (fde == NULL) {
tevent_req_error(req, ENOMEM);
}
}
static void writev_handler(struct tevent_context *ev, struct tevent_fd *fde,
uint16_t flags, void *private_data)
{
struct tevent_req *req = talloc_get_type_abort(
private_data, struct tevent_req);
struct writev_state *state =
tevent_req_data(req, struct writev_state);
size_t to_write, written;
int i;
to_write = 0;
if (flags & TEVENT_FD_READ) {
tevent_req_error(req, EPIPE);
return;
}
for (i=0; i<state->count; i++) {
to_write += state->iov[i].iov_len;
}
written = sys_writev(state->fd, state->iov, state->count);
if (written == -1) {
tevent_req_error(req, errno);
return;
}
if (written == 0) {
tevent_req_error(req, EPIPE);
return;
}
state->total_size += written;
if (written == to_write) {
tevent_req_done(req);
return;
}
/*
* We've written less than we were asked to, drop stuff from
* state->iov.
*/
while (written > 0) {
if (written < state->iov[0].iov_len) {
state->iov[0].iov_base =
(char *)state->iov[0].iov_base + written;
state->iov[0].iov_len -= written;
break;
}
written -= state->iov[0].iov_len;
state->iov += 1;
state->count -= 1;
}
}
ssize_t writev_recv(struct tevent_req *req, int *perrno)
{
struct writev_state *state =
tevent_req_data(req, struct writev_state);
if (tevent_req_is_unix_error(req, perrno)) {
return -1;
}
return state->total_size;
}
struct read_packet_state {
int fd;
uint8_t *buf;
size_t nread;
ssize_t (*more)(uint8_t *buf, size_t buflen, void *private_data);
void *private_data;
};
static void read_packet_handler(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *private_data);
struct tevent_req *read_packet_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
int fd, size_t initial,
ssize_t (*more)(uint8_t *buf,
size_t buflen,
void *private_data),
void *private_data)
{
struct tevent_req *result;
struct read_packet_state *state;
struct tevent_fd *fde;
result = tevent_req_create(mem_ctx, &state, struct read_packet_state);
if (result == NULL) {
return NULL;
}
state->fd = fd;
state->nread = 0;
state->more = more;
state->private_data = private_data;
state->buf = talloc_array(state, uint8_t, initial);
if (state->buf == NULL) {
goto fail;
}
fde = tevent_add_fd(ev, state, fd, TEVENT_FD_READ, read_packet_handler,
result);
if (fde == NULL) {
goto fail;
}
return result;
fail:
TALLOC_FREE(result);
return NULL;
}
static void read_packet_handler(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *private_data)
{
struct tevent_req *req = talloc_get_type_abort(
private_data, struct tevent_req);
struct read_packet_state *state =
tevent_req_data(req, struct read_packet_state);
size_t total = talloc_get_size(state->buf);
ssize_t nread, more;
uint8_t *tmp;
nread = recv(state->fd, state->buf+state->nread, total-state->nread,
0);
if (nread == -1) {
tevent_req_error(req, errno);
return;
}
if (nread == 0) {
tevent_req_error(req, EPIPE);
return;
}
state->nread += nread;
if (state->nread < total) {
/* Come back later */
return;
}
/*
* We got what was initially requested. See if "more" asks for -- more.
*/
if (state->more == NULL) {
/* Nobody to ask, this is a async read_data */
tevent_req_done(req);
return;
}
more = state->more(state->buf, total, state->private_data);
if (more == -1) {
/* We got an invalid packet, tell the caller */
tevent_req_error(req, EIO);
return;
}
if (more == 0) {
/* We're done, full packet received */
tevent_req_done(req);
return;
}
tmp = TALLOC_REALLOC_ARRAY(state, state->buf, uint8_t, total+more);
if (tevent_req_nomem(tmp, req)) {
return;
}
state->buf = tmp;
}
ssize_t read_packet_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
uint8_t **pbuf, int *perrno)
{
struct read_packet_state *state =
tevent_req_data(req, struct read_packet_state);
if (tevent_req_is_unix_error(req, perrno)) {
return -1;
}
*pbuf = talloc_move(mem_ctx, &state->buf);
return talloc_get_size(*pbuf);
}
|