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/*
Unix SMB/CIFS implementation.
Copyright (C) Stefan Metzmacher 2009
** NOTE! The following LGPL license applies to the tevent
** 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include "system/network.h"
#include "tsocket.h"
#include "tsocket_internal.h"
struct tsocket_recvfrom_state {
/* this structs are owned by the caller */
struct {
struct tsocket_context *sock;
} caller;
uint8_t *buf;
size_t len;
struct tsocket_address *src;
};
static int tsocket_recvfrom_state_destructor(struct tsocket_recvfrom_state *state)
{
if (state->caller.sock) {
tsocket_set_readable_handler(state->caller.sock, NULL, NULL);
}
ZERO_STRUCT(state->caller);
return 0;
}
static void tsocket_recvfrom_handler(struct tsocket_context *sock,
void *private_data);
struct tevent_req *tsocket_recvfrom_send(struct tsocket_context *sock,
TALLOC_CTX *mem_ctx)
{
struct tevent_req *req;
struct tsocket_recvfrom_state *state;
int ret;
int err;
bool dummy;
req = tevent_req_create(mem_ctx, &state,
struct tsocket_recvfrom_state);
if (!req) {
return NULL;
}
state->caller.sock = sock;
state->buf = NULL;
state->len = 0;
state->src = NULL;
talloc_set_destructor(state, tsocket_recvfrom_state_destructor);
ret = tsocket_set_readable_handler(sock,
tsocket_recvfrom_handler,
req);
err = tsocket_error_from_errno(ret, errno, &dummy);
if (tevent_req_error(req, err)) {
goto post;
}
return req;
post:
return tevent_req_post(req, sock->event.ctx);
}
static void tsocket_recvfrom_handler(struct tsocket_context *sock,
void *private_data)
{
struct tevent_req *req = talloc_get_type(private_data,
struct tevent_req);
struct tsocket_recvfrom_state *state = tevent_req_data(req,
struct tsocket_recvfrom_state);
ssize_t ret;
int err;
bool retry;
ret = tsocket_pending(state->caller.sock);
if (ret == 0) {
/* retry later */
return;
}
err = tsocket_error_from_errno(ret, errno, &retry);
if (retry) {
/* retry later */
return;
}
if (tevent_req_error(req, err)) {
return;
}
state->buf = talloc_array(state, uint8_t, ret);
if (tevent_req_nomem(state->buf, req)) {
return;
}
state->len = ret;
ret = tsocket_recvfrom(state->caller.sock,
state->buf,
state->len,
state,
&state->src);
err = tsocket_error_from_errno(ret, errno, &retry);
if (retry) {
/* retry later */
return;
}
if (tevent_req_error(req, err)) {
return;
}
if (ret != state->len) {
tevent_req_error(req, EIO);
return;
}
tevent_req_done(req);
}
ssize_t tsocket_recvfrom_recv(struct tevent_req *req,
int *perrno,
TALLOC_CTX *mem_ctx,
uint8_t **buf,
struct tsocket_address **src)
{
struct tsocket_recvfrom_state *state = tevent_req_data(req,
struct tsocket_recvfrom_state);
ssize_t ret;
ret = tsocket_simple_int_recv(req, perrno);
if (ret == 0) {
*buf = talloc_move(mem_ctx, &state->buf);
ret = state->len;
if (src) {
*src = talloc_move(mem_ctx, &state->src);
}
}
tevent_req_received(req);
return ret;
}
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