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/*
Unix SMB/CIFS implementation.
Infrastructure for async SMB client requests
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/async_req/async_sock.h"
#include "read_smb.h"
#include "lib/util/tevent_unix.h"
/*
* Read an smb packet asynchronously, discard keepalives
*/
struct read_smb_state {
struct tevent_context *ev;
int fd;
uint8_t *buf;
};
static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data);
static void read_smb_done(struct tevent_req *subreq);
struct tevent_req *read_smb_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
int fd)
{
struct tevent_req *result, *subreq;
struct read_smb_state *state;
result = tevent_req_create(mem_ctx, &state, struct read_smb_state);
if (result == NULL) {
return NULL;
}
state->ev = ev;
state->fd = fd;
subreq = read_packet_send(state, ev, fd, 4, read_smb_more, NULL);
if (subreq == NULL) {
goto fail;
}
tevent_req_set_callback(subreq, read_smb_done, result);
return result;
fail:
TALLOC_FREE(result);
return NULL;
}
static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data)
{
if (buflen > 4) {
return 0; /* We've been here, we're done */
}
return smb_len_large(buf);
}
static void read_smb_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct read_smb_state *state = tevent_req_data(
req, struct read_smb_state);
ssize_t len;
int err;
len = read_packet_recv(subreq, state, &state->buf, &err);
TALLOC_FREE(subreq);
if (len == -1) {
tevent_req_error(req, err);
return;
}
if (CVAL(state->buf, 0) == SMBkeepalive) {
subreq = read_packet_send(state, state->ev, state->fd, 4,
read_smb_more, NULL);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, read_smb_done, req);
return;
}
tevent_req_done(req);
}
ssize_t read_smb_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
uint8_t **pbuf, int *perrno)
{
struct read_smb_state *state = tevent_req_data(
req, struct read_smb_state);
if (tevent_req_is_unix_error(req, perrno)) {
return -1;
}
*pbuf = talloc_move(mem_ctx, &state->buf);
return talloc_get_size(*pbuf);
}
ssize_t read_smb(int fd, TALLOC_CTX *mem_ctx, uint8_t **pbuf, int *perrno)
{
TALLOC_CTX *frame = talloc_stackframe();
struct event_context *ev;
struct tevent_req *req;
ssize_t ret = -1;
ev = event_context_init(frame);
if (ev == NULL) {
goto fail;
}
req = read_smb_send(frame, ev, fd);
if (req == NULL) {
goto fail;
}
if (!tevent_req_poll(req, ev)) {
goto fail;
}
ret = read_smb_recv(req, mem_ctx, pbuf, perrno);
fail:
TALLOC_FREE(frame);
return ret;
}
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