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_req.h"
24 #include "lib/async_req/async_sock.h"
25 #include "lib/util/tevent_unix.h"
29 #define TALLOC_FREE(ctx) do { talloc_free(ctx); ctx=NULL; } while(0)
33 * @brief Map async_req states to unix-style errnos
34 * @param[in] req The async req to get the state from
35 * @param[out] err Pointer to take the unix-style errno
37 * @return true if the async_req is in an error state, false otherwise
40 bool async_req_is_errno(struct async_req *req, int *err)
42 enum async_req_state state;
45 if (!async_req_is_error(req, &state, &error)) {
50 case ASYNC_REQ_USER_ERROR:
53 case ASYNC_REQ_TIMED_OUT:
60 case ASYNC_REQ_NO_MEMORY:
70 int async_req_simple_recv_errno(struct async_req *req)
74 if (async_req_is_errno(req, &err)) {
81 struct async_send_state {
89 static void async_send_handler(struct tevent_context *ev,
90 struct tevent_fd *fde,
91 uint16_t flags, void *private_data);
93 struct tevent_req *async_send_send(TALLOC_CTX *mem_ctx,
94 struct tevent_context *ev,
95 int fd, const void *buf, size_t len,
98 struct tevent_req *result;
99 struct async_send_state *state;
100 struct tevent_fd *fde;
102 result = tevent_req_create(mem_ctx, &state, struct async_send_state);
103 if (result == NULL) {
109 state->flags = flags;
111 fde = tevent_add_fd(ev, state, fd, TEVENT_FD_WRITE, async_send_handler,
120 static void async_send_handler(struct tevent_context *ev,
121 struct tevent_fd *fde,
122 uint16_t flags, void *private_data)
124 struct tevent_req *req = talloc_get_type_abort(
125 private_data, struct tevent_req);
126 struct async_send_state *state = talloc_get_type_abort(
127 req->private_state, struct async_send_state);
129 state->sent = send(state->fd, state->buf, state->len, state->flags);
130 if (state->sent == -1) {
131 tevent_req_error(req, errno);
134 tevent_req_done(req);
137 ssize_t async_send_recv(struct tevent_req *req, int *perrno)
139 struct async_send_state *state = talloc_get_type_abort(
140 req->private_state, struct async_send_state);
142 if (tevent_req_is_unix_error(req, perrno)) {
148 struct async_recv_state {
156 static void async_recv_handler(struct tevent_context *ev,
157 struct tevent_fd *fde,
158 uint16_t flags, void *private_data);
160 struct tevent_req *async_recv_send(TALLOC_CTX *mem_ctx,
161 struct tevent_context *ev,
162 int fd, void *buf, size_t len, int flags)
164 struct tevent_req *result;
165 struct async_recv_state *state;
166 struct tevent_fd *fde;
168 result = tevent_req_create(mem_ctx, &state, struct async_recv_state);
169 if (result == NULL) {
175 state->flags = flags;
177 fde = tevent_add_fd(ev, state, fd, TEVENT_FD_READ, async_recv_handler,
186 static void async_recv_handler(struct tevent_context *ev,
187 struct tevent_fd *fde,
188 uint16_t flags, void *private_data)
190 struct tevent_req *req = talloc_get_type_abort(
191 private_data, struct tevent_req);
192 struct async_recv_state *state = talloc_get_type_abort(
193 req->private_state, struct async_recv_state);
195 state->received = recv(state->fd, state->buf, state->len,
197 if (state->received == -1) {
198 tevent_req_error(req, errno);
201 tevent_req_done(req);
204 ssize_t async_recv_recv(struct tevent_req *req, int *perrno)
206 struct async_recv_state *state = talloc_get_type_abort(
207 req->private_state, struct async_recv_state);
209 if (tevent_req_is_unix_error(req, perrno)) {
212 return state->received;
215 struct async_connect_state {
222 static void async_connect_connected(struct tevent_context *ev,
223 struct tevent_fd *fde, uint16_t flags,
227 * @brief async version of connect(2)
228 * @param[in] mem_ctx The memory context to hang the result off
229 * @param[in] ev The event context to work from
230 * @param[in] fd The socket to recv from
231 * @param[in] address Where to connect?
232 * @param[in] address_len Length of *address
233 * @retval The async request
235 * This function sets the socket into non-blocking state to be able to call
236 * connect in an async state. This will be reset when the request is finished.
239 struct tevent_req *async_connect_send(TALLOC_CTX *mem_ctx,
240 struct tevent_context *ev,
241 int fd, const struct sockaddr *address,
242 socklen_t address_len)
244 struct tevent_req *result;
245 struct async_connect_state *state;
246 struct tevent_fd *fde;
248 result = tevent_req_create(
249 mem_ctx, &state, struct async_connect_state);
250 if (result == NULL) {
255 * We have to set the socket to nonblocking for async connect(2). Keep
256 * the old sockflags around.
260 state->sys_errno = 0;
262 state->old_sockflags = fcntl(fd, F_GETFL, 0);
263 if (state->old_sockflags == -1) {
267 set_blocking(fd, false);
269 state->result = connect(fd, address, address_len);
270 if (state->result == 0) {
276 * A number of error messages show that something good is progressing
277 * and that we have to wait for readability.
279 * If none of them are present, bail out.
282 if (!(errno == EINPROGRESS || errno == EALREADY ||
286 errno == EAGAIN || errno == EINTR)) {
290 fde = tevent_add_fd(ev, state, fd, TEVENT_FD_READ | TEVENT_FD_WRITE,
291 async_connect_connected, result);
299 state->sys_errno = errno;
300 fcntl(fd, F_SETFL, state->old_sockflags);
301 if (state->sys_errno == 0) {
302 tevent_req_done(result);
304 tevent_req_error(result, state->sys_errno);
306 return tevent_req_post(result, ev);
310 * fde event handler for connect(2)
311 * @param[in] ev The event context that sent us here
312 * @param[in] fde The file descriptor event associated with the connect
313 * @param[in] flags Indicate read/writeability of the socket
314 * @param[in] priv private data, "struct async_req *" in this case
317 static void async_connect_connected(struct tevent_context *ev,
318 struct tevent_fd *fde, uint16_t flags,
321 struct tevent_req *req = talloc_get_type_abort(
322 priv, struct tevent_req);
323 struct async_connect_state *state = talloc_get_type_abort(
324 req->private_state, struct async_connect_state);
329 * Stevens, Network Programming says that if there's a
330 * successful connect, the socket is only writable. Upon an
331 * error, it's both readable and writable.
333 if ((flags & (TEVENT_FD_READ|TEVENT_FD_WRITE))
334 == (TEVENT_FD_READ|TEVENT_FD_WRITE)) {
336 socklen_t err_len = sizeof(sockerr);
338 if (getsockopt(state->fd, SOL_SOCKET, SO_ERROR,
339 (void *)&sockerr, &err_len) == 0) {
343 state->sys_errno = errno;
345 DEBUG(10, ("connect returned %s\n", strerror(errno)));
347 fcntl(state->fd, F_SETFL, state->old_sockflags);
348 tevent_req_error(req, state->sys_errno);
352 state->sys_errno = 0;
353 tevent_req_done(req);
356 int async_connect_recv(struct tevent_req *req, int *perrno)
358 struct async_connect_state *state = talloc_get_type_abort(
359 req->private_state, struct async_connect_state);
362 fcntl(state->fd, F_SETFL, state->old_sockflags);
364 if (tevent_req_is_unix_error(req, &err)) {
369 if (state->sys_errno == 0) {
373 *perrno = state->sys_errno;
377 struct writev_state {
378 struct tevent_context *ev;
385 static void writev_handler(struct tevent_context *ev, struct tevent_fd *fde,
386 uint16_t flags, void *private_data);
388 struct tevent_req *writev_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
389 int fd, struct iovec *iov, int count)
391 struct tevent_req *result;
392 struct writev_state *state;
393 struct tevent_fd *fde;
395 result = tevent_req_create(mem_ctx, &state, struct writev_state);
396 if (result == NULL) {
401 state->total_size = 0;
402 state->count = count;
403 state->iov = (struct iovec *)talloc_memdup(
404 state, iov, sizeof(struct iovec) * count);
405 if (state->iov == NULL) {
409 fde = tevent_add_fd(ev, state, fd, TEVENT_FD_WRITE, writev_handler,
421 static void writev_handler(struct tevent_context *ev, struct tevent_fd *fde,
422 uint16_t flags, void *private_data)
424 struct tevent_req *req = talloc_get_type_abort(
425 private_data, struct tevent_req);
426 struct writev_state *state = talloc_get_type_abort(
427 req->private_state, struct writev_state);
428 size_t to_write, written;
433 for (i=0; i<state->count; i++) {
434 to_write += state->iov[i].iov_len;
437 written = sys_writev(state->fd, state->iov, state->count);
439 tevent_req_error(req, errno);
443 tevent_req_error(req, EPIPE);
446 state->total_size += written;
448 if (written == to_write) {
449 tevent_req_done(req);
454 * We've written less than we were asked to, drop stuff from
458 while (written > 0) {
459 if (written < state->iov[0].iov_len) {
460 state->iov[0].iov_base =
461 (char *)state->iov[0].iov_base + written;
462 state->iov[0].iov_len -= written;
465 written = state->iov[0].iov_len;
471 ssize_t writev_recv(struct tevent_req *req, int *perrno)
473 struct writev_state *state = talloc_get_type_abort(
474 req->private_state, struct writev_state);
476 if (tevent_req_is_unix_error(req, perrno)) {
479 return state->total_size;
482 struct read_packet_state {
486 ssize_t (*more)(uint8_t *buf, size_t buflen, void *private_data);
490 static void read_packet_handler(struct tevent_context *ev,
491 struct tevent_fd *fde,
492 uint16_t flags, void *private_data);
494 struct tevent_req *read_packet_send(TALLOC_CTX *mem_ctx,
495 struct tevent_context *ev,
496 int fd, size_t initial,
497 ssize_t (*more)(uint8_t *buf,
502 struct tevent_req *result;
503 struct read_packet_state *state;
504 struct tevent_fd *fde;
506 result = tevent_req_create(mem_ctx, &state, struct read_packet_state);
507 if (result == NULL) {
513 state->private_data = private_data;
515 state->buf = talloc_array(state, uint8_t, initial);
516 if (state->buf == NULL) {
520 fde = tevent_add_fd(ev, state, fd, TEVENT_FD_READ, read_packet_handler,
531 static void read_packet_handler(struct tevent_context *ev,
532 struct tevent_fd *fde,
533 uint16_t flags, void *private_data)
535 struct tevent_req *req = talloc_get_type_abort(
536 private_data, struct tevent_req);
537 struct read_packet_state *state = talloc_get_type_abort(
538 req->private_state, struct read_packet_state);
539 size_t total = talloc_get_size(state->buf);
543 nread = read(state->fd, state->buf+state->nread, total-state->nread);
545 tevent_req_error(req, errno);
549 tevent_req_error(req, EPIPE);
553 state->nread += nread;
554 if (state->nread < total) {
555 /* Come back later */
560 * We got what was initially requested. See if "more" asks for -- more.
562 if (state->more == NULL) {
563 /* Nobody to ask, this is a async read_data */
564 tevent_req_done(req);
568 more = state->more(state->buf, total, state->private_data);
570 /* We got an invalid packet, tell the caller */
571 tevent_req_error(req, EIO);
575 /* We're done, full packet received */
576 tevent_req_done(req);
580 tmp = TALLOC_REALLOC_ARRAY(state, state->buf, uint8_t, total+more);
581 if (tevent_req_nomem(tmp, req)) {
587 ssize_t read_packet_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
588 uint8_t **pbuf, int *perrno)
590 struct read_packet_state *state = talloc_get_type_abort(
591 req->private_state, struct read_packet_state);
593 if (tevent_req_is_unix_error(req, perrno)) {
596 *pbuf = talloc_move(mem_ctx, &state->buf);
597 return talloc_get_size(*pbuf);