2 Unix SMB/CIFS implementation.
4 Copyright (C) Volker Lendecke 2008
6 ** NOTE! The following LGPL license applies to the async_sock
7 ** library. This does NOT imply that all of Samba is released
10 This library is free software; you can redistribute it and/or
11 modify it under the terms of the GNU Lesser General Public
12 License as published by the Free Software Foundation; either
13 version 3 of the License, or (at your option) any later version.
15 This library is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Library General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "system/network.h"
26 #include "system/filesys.h"
29 #include "lib/async_req/async_sock.h"
31 /* Note: lib/util/ is currently GPL */
32 #include "lib/util/tevent_unix.h"
33 #include "lib/util/util.h"
36 #define TALLOC_FREE(ctx) do { talloc_free(ctx); ctx=NULL; } while(0)
39 struct async_send_state {
47 static void async_send_handler(struct tevent_context *ev,
48 struct tevent_fd *fde,
49 uint16_t flags, void *private_data);
51 struct tevent_req *async_send_send(TALLOC_CTX *mem_ctx,
52 struct tevent_context *ev,
53 int fd, const void *buf, size_t len,
56 struct tevent_req *result;
57 struct async_send_state *state;
58 struct tevent_fd *fde;
60 result = tevent_req_create(mem_ctx, &state, struct async_send_state);
69 fde = tevent_add_fd(ev, state, fd, TEVENT_FD_WRITE, async_send_handler,
78 static void async_send_handler(struct tevent_context *ev,
79 struct tevent_fd *fde,
80 uint16_t flags, void *private_data)
82 struct tevent_req *req = talloc_get_type_abort(
83 private_data, struct tevent_req);
84 struct async_send_state *state =
85 tevent_req_data(req, struct async_send_state);
87 state->sent = send(state->fd, state->buf, state->len, state->flags);
88 if ((state->sent == -1) && (errno == EINTR)) {
92 if (state->sent == -1) {
93 tevent_req_error(req, errno);
99 ssize_t async_send_recv(struct tevent_req *req, int *perrno)
101 struct async_send_state *state =
102 tevent_req_data(req, struct async_send_state);
104 if (tevent_req_is_unix_error(req, perrno)) {
110 struct async_recv_state {
118 static void async_recv_handler(struct tevent_context *ev,
119 struct tevent_fd *fde,
120 uint16_t flags, void *private_data);
122 struct tevent_req *async_recv_send(TALLOC_CTX *mem_ctx,
123 struct tevent_context *ev,
124 int fd, void *buf, size_t len, int flags)
126 struct tevent_req *result;
127 struct async_recv_state *state;
128 struct tevent_fd *fde;
130 result = tevent_req_create(mem_ctx, &state, struct async_recv_state);
131 if (result == NULL) {
137 state->flags = flags;
139 fde = tevent_add_fd(ev, state, fd, TEVENT_FD_READ, async_recv_handler,
148 static void async_recv_handler(struct tevent_context *ev,
149 struct tevent_fd *fde,
150 uint16_t flags, void *private_data)
152 struct tevent_req *req = talloc_get_type_abort(
153 private_data, struct tevent_req);
154 struct async_recv_state *state =
155 tevent_req_data(req, struct async_recv_state);
157 state->received = recv(state->fd, state->buf, state->len,
159 if ((state->received == -1) && (errno == EINTR)) {
163 if (state->received == -1) {
164 tevent_req_error(req, errno);
167 tevent_req_done(req);
170 ssize_t async_recv_recv(struct tevent_req *req, int *perrno)
172 struct async_recv_state *state =
173 tevent_req_data(req, struct async_recv_state);
175 if (tevent_req_is_unix_error(req, perrno)) {
178 return state->received;
181 struct async_connect_state {
186 socklen_t address_len;
187 struct sockaddr_storage address;
190 static void async_connect_connected(struct tevent_context *ev,
191 struct tevent_fd *fde, uint16_t flags,
195 * @brief async version of connect(2)
196 * @param[in] mem_ctx The memory context to hang the result off
197 * @param[in] ev The event context to work from
198 * @param[in] fd The socket to recv from
199 * @param[in] address Where to connect?
200 * @param[in] address_len Length of *address
201 * @retval The async request
203 * This function sets the socket into non-blocking state to be able to call
204 * connect in an async state. This will be reset when the request is finished.
207 struct tevent_req *async_connect_send(TALLOC_CTX *mem_ctx,
208 struct tevent_context *ev,
209 int fd, const struct sockaddr *address,
210 socklen_t address_len)
212 struct tevent_req *result;
213 struct async_connect_state *state;
214 struct tevent_fd *fde;
216 result = tevent_req_create(
217 mem_ctx, &state, struct async_connect_state);
218 if (result == NULL) {
223 * We have to set the socket to nonblocking for async connect(2). Keep
224 * the old sockflags around.
228 state->sys_errno = 0;
230 state->old_sockflags = fcntl(fd, F_GETFL, 0);
231 if (state->old_sockflags == -1) {
235 state->address_len = address_len;
236 if (address_len > sizeof(state->address)) {
240 memcpy(&state->address, address, address_len);
242 set_blocking(fd, false);
244 state->result = connect(fd, address, address_len);
245 if (state->result == 0) {
246 tevent_req_done(result);
251 * A number of error messages show that something good is progressing
252 * and that we have to wait for readability.
254 * If none of them are present, bail out.
257 if (!(errno == EINPROGRESS || errno == EALREADY ||
261 errno == EAGAIN || errno == EINTR)) {
262 state->sys_errno = errno;
266 fde = tevent_add_fd(ev, state, fd, TEVENT_FD_READ | TEVENT_FD_WRITE,
267 async_connect_connected, result);
269 state->sys_errno = ENOMEM;
275 tevent_req_error(result, state->sys_errno);
277 fcntl(fd, F_SETFL, state->old_sockflags);
278 return tevent_req_post(result, ev);
282 * fde event handler for connect(2)
283 * @param[in] ev The event context that sent us here
284 * @param[in] fde The file descriptor event associated with the connect
285 * @param[in] flags Indicate read/writeability of the socket
286 * @param[in] priv private data, "struct async_req *" in this case
289 static void async_connect_connected(struct tevent_context *ev,
290 struct tevent_fd *fde, uint16_t flags,
293 struct tevent_req *req = talloc_get_type_abort(
294 priv, struct tevent_req);
295 struct async_connect_state *state =
296 tevent_req_data(req, struct async_connect_state);
299 * Stevens, Network Programming says that if there's a
300 * successful connect, the socket is only writable. Upon an
301 * error, it's both readable and writable.
303 if ((flags & (TEVENT_FD_READ|TEVENT_FD_WRITE))
304 == (TEVENT_FD_READ|TEVENT_FD_WRITE)) {
307 ret = connect(state->fd,
308 (struct sockaddr *)(void *)&state->address,
312 tevent_req_done(req);
316 if (errno == EINPROGRESS) {
317 /* Try again later, leave the fde around */
321 tevent_req_error(req, errno);
325 state->sys_errno = 0;
326 tevent_req_done(req);
329 int async_connect_recv(struct tevent_req *req, int *perrno)
331 struct async_connect_state *state =
332 tevent_req_data(req, struct async_connect_state);
335 fcntl(state->fd, F_SETFL, state->old_sockflags);
337 if (tevent_req_is_unix_error(req, &err)) {
342 if (state->sys_errno == 0) {
346 *perrno = state->sys_errno;
350 struct writev_state {
351 struct tevent_context *ev;
359 static void writev_trigger(struct tevent_req *req, void *private_data);
360 static void writev_handler(struct tevent_context *ev, struct tevent_fd *fde,
361 uint16_t flags, void *private_data);
363 struct tevent_req *writev_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
364 struct tevent_queue *queue, int fd,
365 bool err_on_readability,
366 struct iovec *iov, int count)
368 struct tevent_req *req;
369 struct writev_state *state;
371 req = tevent_req_create(mem_ctx, &state, struct writev_state);
377 state->total_size = 0;
378 state->count = count;
379 state->iov = (struct iovec *)talloc_memdup(
380 state, iov, sizeof(struct iovec) * count);
381 if (state->iov == NULL) {
384 state->flags = TEVENT_FD_WRITE;
385 if (err_on_readability) {
386 state->flags |= TEVENT_FD_READ;
390 struct tevent_fd *fde;
391 fde = tevent_add_fd(state->ev, state, state->fd,
392 state->flags, writev_handler, req);
393 if (tevent_req_nomem(fde, req)) {
394 return tevent_req_post(req, ev);
399 if (!tevent_queue_add(queue, ev, req, writev_trigger, NULL)) {
408 static void writev_trigger(struct tevent_req *req, void *private_data)
410 struct writev_state *state = tevent_req_data(req, struct writev_state);
411 struct tevent_fd *fde;
413 fde = tevent_add_fd(state->ev, state, state->fd, state->flags,
414 writev_handler, req);
416 tevent_req_error(req, ENOMEM);
420 static void writev_handler(struct tevent_context *ev, struct tevent_fd *fde,
421 uint16_t flags, void *private_data)
423 struct tevent_req *req = talloc_get_type_abort(
424 private_data, struct tevent_req);
425 struct writev_state *state =
426 tevent_req_data(req, struct writev_state);
427 size_t to_write, written;
432 if ((state->flags & TEVENT_FD_READ) && (flags & TEVENT_FD_READ)) {
433 tevent_req_error(req, EPIPE);
437 for (i=0; i<state->count; i++) {
438 to_write += state->iov[i].iov_len;
441 written = writev(state->fd, state->iov, state->count);
442 if ((written == -1) && (errno == EINTR)) {
447 tevent_req_error(req, errno);
451 tevent_req_error(req, EPIPE);
454 state->total_size += written;
456 if (written == to_write) {
457 tevent_req_done(req);
462 * We've written less than we were asked to, drop stuff from
466 while (written > 0) {
467 if (written < state->iov[0].iov_len) {
468 state->iov[0].iov_base =
469 (char *)state->iov[0].iov_base + written;
470 state->iov[0].iov_len -= written;
473 written -= state->iov[0].iov_len;
479 ssize_t writev_recv(struct tevent_req *req, int *perrno)
481 struct writev_state *state =
482 tevent_req_data(req, struct writev_state);
484 if (tevent_req_is_unix_error(req, perrno)) {
487 return state->total_size;
490 struct read_packet_state {
494 ssize_t (*more)(uint8_t *buf, size_t buflen, void *private_data);
498 static void read_packet_handler(struct tevent_context *ev,
499 struct tevent_fd *fde,
500 uint16_t flags, void *private_data);
502 struct tevent_req *read_packet_send(TALLOC_CTX *mem_ctx,
503 struct tevent_context *ev,
504 int fd, size_t initial,
505 ssize_t (*more)(uint8_t *buf,
510 struct tevent_req *result;
511 struct read_packet_state *state;
512 struct tevent_fd *fde;
514 result = tevent_req_create(mem_ctx, &state, struct read_packet_state);
515 if (result == NULL) {
521 state->private_data = private_data;
523 state->buf = talloc_array(state, uint8_t, initial);
524 if (state->buf == NULL) {
528 fde = tevent_add_fd(ev, state, fd, TEVENT_FD_READ, read_packet_handler,
539 static void read_packet_handler(struct tevent_context *ev,
540 struct tevent_fd *fde,
541 uint16_t flags, void *private_data)
543 struct tevent_req *req = talloc_get_type_abort(
544 private_data, struct tevent_req);
545 struct read_packet_state *state =
546 tevent_req_data(req, struct read_packet_state);
547 size_t total = talloc_get_size(state->buf);
551 nread = recv(state->fd, state->buf+state->nread, total-state->nread,
553 if ((nread == -1) && (errno == EINTR)) {
558 tevent_req_error(req, errno);
562 tevent_req_error(req, EPIPE);
566 state->nread += nread;
567 if (state->nread < total) {
568 /* Come back later */
573 * We got what was initially requested. See if "more" asks for -- more.
575 if (state->more == NULL) {
576 /* Nobody to ask, this is a async read_data */
577 tevent_req_done(req);
581 more = state->more(state->buf, total, state->private_data);
583 /* We got an invalid packet, tell the caller */
584 tevent_req_error(req, EIO);
588 /* We're done, full packet received */
589 tevent_req_done(req);
593 tmp = talloc_realloc(state, state->buf, uint8_t, total+more);
594 if (tevent_req_nomem(tmp, req)) {
600 ssize_t read_packet_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
601 uint8_t **pbuf, int *perrno)
603 struct read_packet_state *state =
604 tevent_req_data(req, struct read_packet_state);
606 if (tevent_req_is_unix_error(req, perrno)) {
609 *pbuf = talloc_move(mem_ctx, &state->buf);
610 return talloc_get_size(*pbuf);