2 Unix SMB/CIFS implementation.
4 Copyright (C) Volker Lendecke 2008
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include "lib/talloc/talloc.h"
22 #include "lib/tevent/tevent.h"
23 #include "lib/async_req/async_sock.h"
24 #include "lib/util/tevent_unix.h"
28 #define TALLOC_FREE(ctx) do { talloc_free(ctx); ctx=NULL; } while(0)
31 struct async_send_state {
39 static void async_send_handler(struct tevent_context *ev,
40 struct tevent_fd *fde,
41 uint16_t flags, void *private_data);
43 struct tevent_req *async_send_send(TALLOC_CTX *mem_ctx,
44 struct tevent_context *ev,
45 int fd, const void *buf, size_t len,
48 struct tevent_req *result;
49 struct async_send_state *state;
50 struct tevent_fd *fde;
52 result = tevent_req_create(mem_ctx, &state, struct async_send_state);
61 fde = tevent_add_fd(ev, state, fd, TEVENT_FD_WRITE, async_send_handler,
70 static void async_send_handler(struct tevent_context *ev,
71 struct tevent_fd *fde,
72 uint16_t flags, void *private_data)
74 struct tevent_req *req = talloc_get_type_abort(
75 private_data, struct tevent_req);
76 struct async_send_state *state =
77 tevent_req_data(req, struct async_send_state);
79 state->sent = send(state->fd, state->buf, state->len, state->flags);
80 if (state->sent == -1) {
81 tevent_req_error(req, errno);
87 ssize_t async_send_recv(struct tevent_req *req, int *perrno)
89 struct async_send_state *state =
90 tevent_req_data(req, struct async_send_state);
92 if (tevent_req_is_unix_error(req, perrno)) {
98 struct async_recv_state {
106 static void async_recv_handler(struct tevent_context *ev,
107 struct tevent_fd *fde,
108 uint16_t flags, void *private_data);
110 struct tevent_req *async_recv_send(TALLOC_CTX *mem_ctx,
111 struct tevent_context *ev,
112 int fd, void *buf, size_t len, int flags)
114 struct tevent_req *result;
115 struct async_recv_state *state;
116 struct tevent_fd *fde;
118 result = tevent_req_create(mem_ctx, &state, struct async_recv_state);
119 if (result == NULL) {
125 state->flags = flags;
127 fde = tevent_add_fd(ev, state, fd, TEVENT_FD_READ, async_recv_handler,
136 static void async_recv_handler(struct tevent_context *ev,
137 struct tevent_fd *fde,
138 uint16_t flags, void *private_data)
140 struct tevent_req *req = talloc_get_type_abort(
141 private_data, struct tevent_req);
142 struct async_recv_state *state =
143 tevent_req_data(req, struct async_recv_state);
145 state->received = recv(state->fd, state->buf, state->len,
147 if (state->received == -1) {
148 tevent_req_error(req, errno);
151 tevent_req_done(req);
154 ssize_t async_recv_recv(struct tevent_req *req, int *perrno)
156 struct async_recv_state *state =
157 tevent_req_data(req, struct async_recv_state);
159 if (tevent_req_is_unix_error(req, perrno)) {
162 return state->received;
165 struct async_connect_state {
172 static void async_connect_connected(struct tevent_context *ev,
173 struct tevent_fd *fde, uint16_t flags,
177 * @brief async version of connect(2)
178 * @param[in] mem_ctx The memory context to hang the result off
179 * @param[in] ev The event context to work from
180 * @param[in] fd The socket to recv from
181 * @param[in] address Where to connect?
182 * @param[in] address_len Length of *address
183 * @retval The async request
185 * This function sets the socket into non-blocking state to be able to call
186 * connect in an async state. This will be reset when the request is finished.
189 struct tevent_req *async_connect_send(TALLOC_CTX *mem_ctx,
190 struct tevent_context *ev,
191 int fd, const struct sockaddr *address,
192 socklen_t address_len)
194 struct tevent_req *result;
195 struct async_connect_state *state;
196 struct tevent_fd *fde;
198 result = tevent_req_create(
199 mem_ctx, &state, struct async_connect_state);
200 if (result == NULL) {
205 * We have to set the socket to nonblocking for async connect(2). Keep
206 * the old sockflags around.
210 state->sys_errno = 0;
212 state->old_sockflags = fcntl(fd, F_GETFL, 0);
213 if (state->old_sockflags == -1) {
217 set_blocking(fd, false);
219 state->result = connect(fd, address, address_len);
220 if (state->result == 0) {
221 tevent_req_done(result);
226 * A number of error messages show that something good is progressing
227 * and that we have to wait for readability.
229 * If none of them are present, bail out.
232 if (!(errno == EINPROGRESS || errno == EALREADY ||
236 errno == EAGAIN || errno == EINTR)) {
237 state->sys_errno = errno;
241 fde = tevent_add_fd(ev, state, fd, TEVENT_FD_READ | TEVENT_FD_WRITE,
242 async_connect_connected, result);
244 state->sys_errno = ENOMEM;
250 tevent_req_error(result, state->sys_errno);
252 fcntl(fd, F_SETFL, state->old_sockflags);
253 return tevent_req_post(result, ev);
257 * fde event handler for connect(2)
258 * @param[in] ev The event context that sent us here
259 * @param[in] fde The file descriptor event associated with the connect
260 * @param[in] flags Indicate read/writeability of the socket
261 * @param[in] priv private data, "struct async_req *" in this case
264 static void async_connect_connected(struct tevent_context *ev,
265 struct tevent_fd *fde, uint16_t flags,
268 struct tevent_req *req = talloc_get_type_abort(
269 priv, struct tevent_req);
270 struct async_connect_state *state =
271 tevent_req_data(req, struct async_connect_state);
276 * Stevens, Network Programming says that if there's a
277 * successful connect, the socket is only writable. Upon an
278 * error, it's both readable and writable.
280 if ((flags & (TEVENT_FD_READ|TEVENT_FD_WRITE))
281 == (TEVENT_FD_READ|TEVENT_FD_WRITE)) {
283 socklen_t err_len = sizeof(sockerr);
285 if (getsockopt(state->fd, SOL_SOCKET, SO_ERROR,
286 (void *)&sockerr, &err_len) == 0) {
290 state->sys_errno = errno;
292 DEBUG(10, ("connect returned %s\n", strerror(errno)));
294 fcntl(state->fd, F_SETFL, state->old_sockflags);
295 tevent_req_error(req, state->sys_errno);
299 state->sys_errno = 0;
300 tevent_req_done(req);
303 int async_connect_recv(struct tevent_req *req, int *perrno)
305 struct async_connect_state *state =
306 tevent_req_data(req, struct async_connect_state);
309 fcntl(state->fd, F_SETFL, state->old_sockflags);
311 if (tevent_req_is_unix_error(req, &err)) {
316 if (state->sys_errno == 0) {
320 *perrno = state->sys_errno;
324 struct writev_state {
325 struct tevent_context *ev;
332 static void writev_trigger(struct tevent_req *req, void *private_data);
333 static void writev_handler(struct tevent_context *ev, struct tevent_fd *fde,
334 uint16_t flags, void *private_data);
336 struct tevent_req *writev_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
337 struct tevent_queue *queue, int fd,
338 struct iovec *iov, int count)
340 struct tevent_req *req;
341 struct writev_state *state;
343 req = tevent_req_create(mem_ctx, &state, struct writev_state);
349 state->total_size = 0;
350 state->count = count;
351 state->iov = (struct iovec *)talloc_memdup(
352 state, iov, sizeof(struct iovec) * count);
353 if (state->iov == NULL) {
358 struct tevent_fd *fde;
359 fde = tevent_add_fd(state->ev, state, state->fd,
360 TEVENT_FD_WRITE, writev_handler, req);
361 if (tevent_req_nomem(fde, req)) {
362 return tevent_req_post(req, ev);
367 if (!tevent_queue_add(queue, ev, req, writev_trigger, NULL)) {
376 static void writev_trigger(struct tevent_req *req, void *private_data)
378 struct writev_state *state = tevent_req_data(req, struct writev_state);
379 struct tevent_fd *fde;
381 fde = tevent_add_fd(state->ev, state, state->fd, TEVENT_FD_WRITE,
382 writev_handler, req);
384 tevent_req_error(req, ENOMEM);
388 static void writev_handler(struct tevent_context *ev, struct tevent_fd *fde,
389 uint16_t flags, void *private_data)
391 struct tevent_req *req = talloc_get_type_abort(
392 private_data, struct tevent_req);
393 struct writev_state *state =
394 tevent_req_data(req, struct writev_state);
395 size_t to_write, written;
400 for (i=0; i<state->count; i++) {
401 to_write += state->iov[i].iov_len;
404 written = sys_writev(state->fd, state->iov, state->count);
406 tevent_req_error(req, errno);
410 tevent_req_error(req, EPIPE);
413 state->total_size += written;
415 if (written == to_write) {
416 tevent_req_done(req);
421 * We've written less than we were asked to, drop stuff from
425 while (written > 0) {
426 if (written < state->iov[0].iov_len) {
427 state->iov[0].iov_base =
428 (char *)state->iov[0].iov_base + written;
429 state->iov[0].iov_len -= written;
432 written -= state->iov[0].iov_len;
438 ssize_t writev_recv(struct tevent_req *req, int *perrno)
440 struct writev_state *state =
441 tevent_req_data(req, struct writev_state);
443 if (tevent_req_is_unix_error(req, perrno)) {
446 return state->total_size;
449 struct read_packet_state {
453 ssize_t (*more)(uint8_t *buf, size_t buflen, void *private_data);
457 static void read_packet_handler(struct tevent_context *ev,
458 struct tevent_fd *fde,
459 uint16_t flags, void *private_data);
461 struct tevent_req *read_packet_send(TALLOC_CTX *mem_ctx,
462 struct tevent_context *ev,
463 int fd, size_t initial,
464 ssize_t (*more)(uint8_t *buf,
469 struct tevent_req *result;
470 struct read_packet_state *state;
471 struct tevent_fd *fde;
473 result = tevent_req_create(mem_ctx, &state, struct read_packet_state);
474 if (result == NULL) {
480 state->private_data = private_data;
482 state->buf = talloc_array(state, uint8_t, initial);
483 if (state->buf == NULL) {
487 fde = tevent_add_fd(ev, state, fd, TEVENT_FD_READ, read_packet_handler,
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 *req = talloc_get_type_abort(
503 private_data, struct tevent_req);
504 struct read_packet_state *state =
505 tevent_req_data(req, struct read_packet_state);
506 size_t total = talloc_get_size(state->buf);
510 nread = recv(state->fd, state->buf+state->nread, total-state->nread,
513 tevent_req_error(req, errno);
517 tevent_req_error(req, EPIPE);
521 state->nread += nread;
522 if (state->nread < total) {
523 /* Come back later */
528 * We got what was initially requested. See if "more" asks for -- more.
530 if (state->more == NULL) {
531 /* Nobody to ask, this is a async read_data */
532 tevent_req_done(req);
536 more = state->more(state->buf, total, state->private_data);
538 /* We got an invalid packet, tell the caller */
539 tevent_req_error(req, EIO);
543 /* We're done, full packet received */
544 tevent_req_done(req);
548 tmp = TALLOC_REALLOC_ARRAY(state, state->buf, uint8_t, total+more);
549 if (tevent_req_nomem(tmp, req)) {
555 ssize_t read_packet_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
556 uint8_t **pbuf, int *perrno)
558 struct read_packet_state *state =
559 tevent_req_data(req, struct read_packet_state);
561 if (tevent_req_is_unix_error(req, perrno)) {
564 *pbuf = talloc_move(mem_ctx, &state->buf);
565 return talloc_get_size(*pbuf);