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/*
Unix SMB/CIFS implementation.
Async transfer of winbindd_request and _response structs
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 "wbc_async.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND
struct req_read_state {
struct winbindd_request *wb_req;
size_t max_extra_data;
ssize_t ret;
};
static ssize_t wb_req_more(uint8_t *buf, size_t buflen, void *private_data);
static void wb_req_read_done(struct tevent_req *subreq);
struct tevent_req *wb_req_read_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
int fd, size_t max_extra_data)
{
struct tevent_req *req, *subreq;
struct req_read_state *state;
req = tevent_req_create(mem_ctx, &state, struct req_read_state);
if (req == NULL) {
return NULL;
}
state->max_extra_data = max_extra_data;
subreq = read_packet_send(state, ev, fd, 4, wb_req_more, state);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, wb_req_read_done, req);
return req;
}
static ssize_t wb_req_more(uint8_t *buf, size_t buflen, void *private_data)
{
struct req_read_state *state = talloc_get_type_abort(
private_data, struct req_read_state);
struct winbindd_request *req = (struct winbindd_request *)buf;
if (buflen == 4) {
if (req->length != sizeof(struct winbindd_request)) {
DEBUG(0, ("wb_req_read_len: Invalid request size "
"received: %d (expected %d)\n",
(int)req->length,
(int)sizeof(struct winbindd_request)));
return -1;
}
return sizeof(struct winbindd_request) - 4;
}
if ((state->max_extra_data != 0)
&& (req->extra_len > state->max_extra_data)) {
DEBUG(3, ("Got request with %d bytes extra data on "
"unprivileged socket\n", (int)req->extra_len));
return -1;
}
return req->extra_len;
}
static void wb_req_read_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct req_read_state *state = tevent_req_data(
req, struct req_read_state);
int err;
uint8_t *buf;
state->ret = read_packet_recv(subreq, state, &buf, &err);
TALLOC_FREE(subreq);
if (state->ret == -1) {
tevent_req_error(req, err);
return;
}
state->wb_req = (struct winbindd_request *)buf;
if (state->wb_req->extra_len != 0) {
state->wb_req->extra_data.data =
(char *)buf + sizeof(struct winbindd_request);
} else {
state->wb_req->extra_data.data = NULL;
}
tevent_req_done(req);
}
ssize_t wb_req_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
struct winbindd_request **preq, int *err)
{
struct req_read_state *state = tevent_req_data(
req, struct req_read_state);
if (tevent_req_is_unix_error(req, err)) {
return -1;
}
*preq = talloc_move(mem_ctx, &state->wb_req);
return state->ret;
}
struct req_write_state {
struct iovec iov[2];
ssize_t ret;
};
static void wb_req_write_done(struct tevent_req *subreq);
struct tevent_req *wb_req_write_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct tevent_queue *queue, int fd,
struct winbindd_request *wb_req)
{
struct tevent_req *req, *subreq;
struct req_write_state *state;
int count = 1;
req = tevent_req_create(mem_ctx, &state, struct req_write_state);
if (req == NULL) {
return NULL;
}
state->iov[0].iov_base = (void *)wb_req;
state->iov[0].iov_len = sizeof(struct winbindd_request);
if (wb_req->extra_len != 0) {
state->iov[1].iov_base = (void *)wb_req->extra_data.data;
state->iov[1].iov_len = wb_req->extra_len;
count = 2;
}
subreq = writev_send(state, ev, queue, fd, true, state->iov, count);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, wb_req_write_done, req);
return req;
}
static void wb_req_write_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct req_write_state *state = tevent_req_data(
req, struct req_write_state);
int err;
state->ret = writev_recv(subreq, &err);
/*
* We do not TALLOC_FREE(subreq) here, as this would trigger the next
* write of a client. The winbind protocol is purely request/response
* without multiplex ID's, so having multiple requeusts on the fly
* would confuse sequencing.
*
* Eventually the writev_req will be freed, "subreq" a child of "req"
*/
if (state->ret < 0) {
tevent_req_error(req, err);
return;
}
tevent_req_done(req);
}
ssize_t wb_req_write_recv(struct tevent_req *req, int *err)
{
struct req_write_state *state = tevent_req_data(
req, struct req_write_state);
if (tevent_req_is_unix_error(req, err)) {
return -1;
}
return state->ret;
}
struct resp_read_state {
struct winbindd_response *wb_resp;
ssize_t ret;
};
static ssize_t wb_resp_more(uint8_t *buf, size_t buflen, void *private_data);
static void wb_resp_read_done(struct tevent_req *subreq);
struct tevent_req *wb_resp_read_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev, int fd)
{
struct tevent_req *req, *subreq;
struct resp_read_state *state;
req = tevent_req_create(mem_ctx, &state, struct resp_read_state);
if (req == NULL) {
return NULL;
}
subreq = read_packet_send(state, ev, fd, 4, wb_resp_more, state);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, wb_resp_read_done, req);
return req;
}
static ssize_t wb_resp_more(uint8_t *buf, size_t buflen, void *private_data)
{
struct winbindd_response *resp = (struct winbindd_response *)buf;
if (buflen == 4) {
if (resp->length < sizeof(struct winbindd_response)) {
DEBUG(0, ("wb_resp_read_len: Invalid response size "
"received: %d (expected at least%d)\n",
(int)resp->length,
(int)sizeof(struct winbindd_response)));
return -1;
}
}
return resp->length - buflen;
}
static void wb_resp_read_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct resp_read_state *state = tevent_req_data(
req, struct resp_read_state);
uint8_t *buf;
int err;
state->ret = read_packet_recv(subreq, state, &buf, &err);
TALLOC_FREE(subreq);
if (state->ret == -1) {
tevent_req_error(req, err);
return;
}
state->wb_resp = (struct winbindd_response *)buf;
if (state->wb_resp->length > sizeof(struct winbindd_response)) {
state->wb_resp->extra_data.data =
(char *)buf + sizeof(struct winbindd_response);
} else {
state->wb_resp->extra_data.data = NULL;
}
tevent_req_done(req);
}
ssize_t wb_resp_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
struct winbindd_response **presp, int *err)
{
struct resp_read_state *state = tevent_req_data(
req, struct resp_read_state);
if (tevent_req_is_unix_error(req, err)) {
return -1;
}
*presp = talloc_move(mem_ctx, &state->wb_resp);
return state->ret;
}
struct resp_write_state {
struct iovec iov[2];
ssize_t ret;
};
static void wb_resp_write_done(struct tevent_req *subreq);
struct tevent_req *wb_resp_write_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct tevent_queue *queue, int fd,
struct winbindd_response *wb_resp)
{
struct tevent_req *req, *subreq;
struct resp_write_state *state;
int count = 1;
req = tevent_req_create(mem_ctx, &state, struct resp_write_state);
if (req == NULL) {
return NULL;
}
state->iov[0].iov_base = (void *)wb_resp;
state->iov[0].iov_len = sizeof(struct winbindd_response);
if (wb_resp->length > sizeof(struct winbindd_response)) {
state->iov[1].iov_base = (void *)wb_resp->extra_data.data;
state->iov[1].iov_len =
wb_resp->length - sizeof(struct winbindd_response);
count = 2;
}
subreq = writev_send(state, ev, queue, fd, true, state->iov, count);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, wb_resp_write_done, req);
return req;
}
static void wb_resp_write_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct resp_write_state *state = tevent_req_data(
req, struct resp_write_state);
int err;
state->ret = writev_recv(subreq, &err);
TALLOC_FREE(subreq);
if (state->ret < 0) {
tevent_req_error(req, err);
return;
}
tevent_req_done(req);
}
ssize_t wb_resp_write_recv(struct tevent_req *req, int *err)
{
struct resp_write_state *state = tevent_req_data(
req, struct resp_write_state);
if (tevent_req_is_unix_error(req, err)) {
return -1;
}
return state->ret;
}
static bool closed_fd(int fd)
{
struct timeval tv;
fd_set r_fds;
if (fd == -1) {
return true;
}
FD_ZERO(&r_fds);
FD_SET(fd, &r_fds);
ZERO_STRUCT(tv);
if ((select(fd+1, &r_fds, NULL, NULL, &tv) == -1)
|| FD_ISSET(fd, &r_fds)) {
return true;
}
return false;
}
struct wb_simple_trans_state {
struct tevent_context *ev;
int fd;
struct winbindd_response *wb_resp;
};
static void wb_simple_trans_write_done(struct tevent_req *subreq);
static void wb_simple_trans_read_done(struct tevent_req *subreq);
struct tevent_req *wb_simple_trans_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct tevent_queue *queue, int fd,
struct winbindd_request *wb_req)
{
struct tevent_req *req, *subreq;
struct wb_simple_trans_state *state;
req = tevent_req_create(mem_ctx, &state, struct wb_simple_trans_state);
if (req == NULL) {
return NULL;
}
if (closed_fd(fd)) {
tevent_req_error(req, EPIPE);
return tevent_req_post(req, ev);
}
wb_req->length = sizeof(struct winbindd_request);
state->ev = ev;
state->fd = fd;
subreq = wb_req_write_send(state, ev, queue, fd, wb_req);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, wb_simple_trans_write_done, req);
return req;
}
static void wb_simple_trans_write_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct wb_simple_trans_state *state = tevent_req_data(
req, struct wb_simple_trans_state);
ssize_t ret;
int err;
ret = wb_req_write_recv(subreq, &err);
/*
* We do not TALLOC_FREE(subreq) here, as this would trigger the next
* write of a client. The winbind protocol is purely request/response
* without multiplex ID's, so having multiple requeusts on the fly
* would confuse sequencing.
*
* Eventually the "subreq" will be freed, it is a child of "req"
*/
if (ret == -1) {
tevent_req_error(req, err);
return;
}
subreq = wb_resp_read_send(state, state->ev, state->fd);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, wb_simple_trans_read_done, req);
}
static void wb_simple_trans_read_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct wb_simple_trans_state *state = tevent_req_data(
req, struct wb_simple_trans_state);
ssize_t ret;
int err;
ret = wb_resp_read_recv(subreq, state, &state->wb_resp, &err);
if (ret == -1) {
tevent_req_error(req, err);
return;
}
tevent_req_done(req);
}
int wb_simple_trans_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
struct winbindd_response **presponse, int *err)
{
struct wb_simple_trans_state *state = tevent_req_data(
req, struct wb_simple_trans_state);
if (tevent_req_is_unix_error(req, err)) {
return -1;
}
*presponse = talloc_move(mem_ctx, &state->wb_resp);
return 0;
}
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