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/*
* Unix SMB/CIFS implementation.
*
* Copyright (C) Stefan Metzmacher 2009
*
* 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 <tevent.h>
#include "system/filesys.h"
#include "system/network.h"
#include "../lib/tsocket/tsocket.h"
#include "../libcli/util/tstream.h"
#include "../lib/util/tevent_ntstatus.h"
struct tstream_read_pdu_blob_state {
/* this structs are owned by the caller */
struct {
struct tevent_context *ev;
struct tstream_context *stream;
tstream_read_pdu_blob_full_fn_t *full_fn;
void *full_private;
} caller;
DATA_BLOB pdu_blob;
struct iovec tmp_vector;
};
static void tstream_read_pdu_blob_done(struct tevent_req *subreq);
struct tevent_req *tstream_read_pdu_blob_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct tstream_context *stream,
size_t initial_read_size,
tstream_read_pdu_blob_full_fn_t *full_fn,
void *full_private)
{
struct tevent_req *req;
struct tstream_read_pdu_blob_state *state;
struct tevent_req *subreq;
uint8_t *buf;
req = tevent_req_create(mem_ctx, &state,
struct tstream_read_pdu_blob_state);
if (!req) {
return NULL;
}
state->caller.ev = ev;
state->caller.stream = stream;
state->caller.full_fn = full_fn;
state->caller.full_private = full_private;
if (initial_read_size == 0) {
tevent_req_error(req, EINVAL);
return tevent_req_post(req, ev);
}
buf = talloc_array(state, uint8_t, initial_read_size);
if (tevent_req_nomem(buf, req)) {
return tevent_req_post(req, ev);
}
state->pdu_blob.data = buf;
state->pdu_blob.length = initial_read_size;
state->tmp_vector.iov_base = (char *) buf;
state->tmp_vector.iov_len = initial_read_size;
subreq = tstream_readv_send(state, ev, stream, &state->tmp_vector, 1);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, tstream_read_pdu_blob_done, req);
return req;
}
static void tstream_read_pdu_blob_done(struct tevent_req *subreq)
{
struct tevent_req *req =
tevent_req_callback_data(subreq,
struct tevent_req);
struct tstream_read_pdu_blob_state *state =
tevent_req_data(req,
struct tstream_read_pdu_blob_state);
ssize_t ret;
int sys_errno;
size_t old_buf_size = state->pdu_blob.length;
size_t new_buf_size = 0;
size_t pdu_size = 0;
NTSTATUS status;
uint8_t *buf;
ret = tstream_readv_recv(subreq, &sys_errno);
TALLOC_FREE(subreq);
if (ret == -1) {
status = map_nt_error_from_unix_common(sys_errno);
tevent_req_nterror(req, status);
return;
}
status = state->caller.full_fn(state->caller.full_private,
state->pdu_blob, &pdu_size);
if (NT_STATUS_IS_OK(status)) {
tevent_req_done(req);
return;
} else if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
/* more to get */
if (pdu_size > 0) {
new_buf_size = pdu_size;
} else {
/* we don't know the size yet, so get one more byte */
new_buf_size = old_buf_size + 1;
}
} else if (!NT_STATUS_IS_OK(status)) {
tevent_req_nterror(req, status);
return;
}
if (new_buf_size <= old_buf_size) {
tevent_req_nterror(req, NT_STATUS_INVALID_BUFFER_SIZE);
return;
}
buf = talloc_realloc(state, state->pdu_blob.data, uint8_t, new_buf_size);
if (tevent_req_nomem(buf, req)) {
return;
}
state->pdu_blob.data = buf;
state->pdu_blob.length = new_buf_size;
state->tmp_vector.iov_base = (char *) (buf + old_buf_size);
state->tmp_vector.iov_len = new_buf_size - old_buf_size;
subreq = tstream_readv_send(state,
state->caller.ev,
state->caller.stream,
&state->tmp_vector,
1);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, tstream_read_pdu_blob_done, req);
}
NTSTATUS tstream_read_pdu_blob_recv(struct tevent_req *req,
TALLOC_CTX *mem_ctx,
DATA_BLOB *pdu_blob)
{
struct tstream_read_pdu_blob_state *state = tevent_req_data(req,
struct tstream_read_pdu_blob_state);
NTSTATUS status;
if (tevent_req_is_nterror(req, &status)) {
tevent_req_received(req);
return status;
}
*pdu_blob = state->pdu_blob;
talloc_steal(mem_ctx, pdu_blob->data);
tevent_req_received(req);
return NT_STATUS_OK;
}
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