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samba-mirror/source3/smbd/smb2_write.c

414 lines
11 KiB
C

/*
Unix SMB/CIFS implementation.
Core SMB2 server
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 "smbd/smbd.h"
#include "smbd/globals.h"
#include "../libcli/smb/smb_common.h"
#include "../lib/util/tevent_ntstatus.h"
#include "rpc_server/srv_pipe_hnd.h"
static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbd_smb2_request *smb2req,
struct files_struct *in_fsp,
DATA_BLOB in_data,
uint64_t in_offset,
uint32_t in_flags);
static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
uint32_t *out_count);
static void smbd_smb2_request_write_done(struct tevent_req *subreq);
NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
{
NTSTATUS status;
const uint8_t *inbody;
uint16_t in_data_offset;
uint32_t in_data_length;
DATA_BLOB in_data_buffer;
uint64_t in_offset;
uint64_t in_file_id_persistent;
uint64_t in_file_id_volatile;
struct files_struct *in_fsp;
uint32_t in_flags;
struct tevent_req *subreq;
status = smbd_smb2_request_verify_sizes(req, 0x31);
if (!NT_STATUS_IS_OK(status)) {
return smbd_smb2_request_error(req, status);
}
inbody = SMBD_SMB2_IN_BODY_PTR(req);
in_data_offset = SVAL(inbody, 0x02);
in_data_length = IVAL(inbody, 0x04);
in_offset = BVAL(inbody, 0x08);
in_file_id_persistent = BVAL(inbody, 0x10);
in_file_id_volatile = BVAL(inbody, 0x18);
in_flags = IVAL(inbody, 0x2C);
if (in_data_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(req))) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
if (in_data_length > SMBD_SMB2_IN_DYN_LEN(req)) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
/* check the max write size */
if (in_data_length > req->sconn->smb2.max_write) {
DEBUG(2,("smbd_smb2_request_process_write : "
"client ignored max write :%s: 0x%08X: 0x%08X\n",
__location__, in_data_length, req->sconn->smb2.max_write));
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
in_data_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
in_data_buffer.length = in_data_length;
status = smbd_smb2_request_verify_creditcharge(req, in_data_length);
if (!NT_STATUS_IS_OK(status)) {
return smbd_smb2_request_error(req, status);
}
in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
if (in_fsp == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
}
subreq = smbd_smb2_write_send(req, req->sconn->ev_ctx,
req, in_fsp,
in_data_buffer,
in_offset,
in_flags);
if (subreq == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
}
tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
return smbd_smb2_request_pending_queue(req, subreq, 500);
}
static void smbd_smb2_request_write_done(struct tevent_req *subreq)
{
struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
struct smbd_smb2_request);
DATA_BLOB outbody;
DATA_BLOB outdyn;
uint32_t out_count = 0;
NTSTATUS status;
NTSTATUS error; /* transport error */
status = smbd_smb2_write_recv(subreq, &out_count);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
error = smbd_smb2_request_error(req, status);
if (!NT_STATUS_IS_OK(error)) {
smbd_server_connection_terminate(req->sconn,
nt_errstr(error));
return;
}
return;
}
outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
if (outbody.data == NULL) {
error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
if (!NT_STATUS_IS_OK(error)) {
smbd_server_connection_terminate(req->sconn,
nt_errstr(error));
return;
}
return;
}
SSVAL(outbody.data, 0x00, 0x10 + 1); /* struct size */
SSVAL(outbody.data, 0x02, 0); /* reserved */
SIVAL(outbody.data, 0x04, out_count); /* count */
SIVAL(outbody.data, 0x08, 0); /* remaining */
SSVAL(outbody.data, 0x0C, 0); /* write channel info offset */
SSVAL(outbody.data, 0x0E, 0); /* write channel info length */
outdyn = data_blob_const(NULL, 0);
error = smbd_smb2_request_done(req, outbody, &outdyn);
if (!NT_STATUS_IS_OK(error)) {
smbd_server_connection_terminate(req->sconn, nt_errstr(error));
return;
}
}
struct smbd_smb2_write_state {
struct smbd_smb2_request *smb2req;
struct smb_request *smbreq;
files_struct *fsp;
bool write_through;
uint32_t in_length;
uint64_t in_offset;
uint32_t out_count;
};
static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
static NTSTATUS smb2_write_complete_internal(struct tevent_req *req,
ssize_t nwritten, int err,
bool do_sync)
{
NTSTATUS status;
struct smbd_smb2_write_state *state = tevent_req_data(req,
struct smbd_smb2_write_state);
files_struct *fsp = state->fsp;
if (nwritten == -1) {
status = map_nt_error_from_unix(err);
DEBUG(2, ("smb2_write failed: %s, file %s, "
"length=%lu offset=%lu nwritten=-1: %s\n",
fsp_fnum_dbg(fsp),
fsp_str_dbg(fsp),
(unsigned long)state->in_length,
(unsigned long)state->in_offset,
nt_errstr(status)));
return status;
}
DEBUG(3,("smb2: %s, file %s, "
"length=%lu offset=%lu wrote=%lu\n",
fsp_fnum_dbg(fsp),
fsp_str_dbg(fsp),
(unsigned long)state->in_length,
(unsigned long)state->in_offset,
(unsigned long)nwritten));
if ((nwritten == 0) && (state->in_length != 0)) {
DEBUG(5,("smb2: write [%s] disk full\n",
fsp_str_dbg(fsp)));
return NT_STATUS_DISK_FULL;
}
if (do_sync) {
status = sync_file(fsp->conn, fsp, state->write_through);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(5,("smb2: sync_file for %s returned %s\n",
fsp_str_dbg(fsp),
nt_errstr(status)));
return status;
}
}
state->out_count = nwritten;
return NT_STATUS_OK;
}
NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
{
return smb2_write_complete_internal(req, nwritten, err, true);
}
NTSTATUS smb2_write_complete_nosync(struct tevent_req *req, ssize_t nwritten,
int err)
{
return smb2_write_complete_internal(req, nwritten, err, false);
}
static bool smbd_smb2_write_cancel(struct tevent_req *req)
{
struct smbd_smb2_write_state *state =
tevent_req_data(req,
struct smbd_smb2_write_state);
return cancel_smb2_aio(state->smbreq);
}
static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbd_smb2_request *smb2req,
struct files_struct *fsp,
DATA_BLOB in_data,
uint64_t in_offset,
uint32_t in_flags)
{
NTSTATUS status;
struct tevent_req *req = NULL;
struct smbd_smb2_write_state *state = NULL;
struct smb_request *smbreq = NULL;
connection_struct *conn = smb2req->tcon->compat;
ssize_t nwritten;
struct lock_struct lock;
req = tevent_req_create(mem_ctx, &state,
struct smbd_smb2_write_state);
if (req == NULL) {
return NULL;
}
state->smb2req = smb2req;
if (in_flags & SMB2_WRITEFLAG_WRITE_THROUGH) {
state->write_through = true;
}
state->in_length = in_data.length;
state->out_count = 0;
DEBUG(10,("smbd_smb2_write: %s - %s\n",
fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
smbreq = smbd_smb2_fake_smb_request(smb2req);
if (tevent_req_nomem(smbreq, req)) {
return tevent_req_post(req, ev);
}
state->smbreq = smbreq;
state->fsp = fsp;
if (IS_IPC(smbreq->conn)) {
struct tevent_req *subreq = NULL;
if (!fsp_is_np(fsp)) {
tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
return tevent_req_post(req, ev);
}
subreq = np_write_send(state, ev,
fsp->fake_file_handle,
in_data.data,
in_data.length);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq,
smbd_smb2_write_pipe_done,
req);
return req;
}
if (!CHECK_WRITE(fsp)) {
tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
return tevent_req_post(req, ev);
}
/* Try and do an asynchronous write. */
status = schedule_aio_smb2_write(conn,
smbreq,
fsp,
in_offset,
in_data,
state->write_through);
if (NT_STATUS_IS_OK(status)) {
/*
* Doing an async write, allow this
* request to be canceled
*/
tevent_req_set_cancel_fn(req, smbd_smb2_write_cancel);
return req;
}
if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
/* Real error in setting up aio. Fail. */
tevent_req_nterror(req, status);
return tevent_req_post(req, ev);
}
/* Fallback to synchronous. */
init_strict_lock_struct(fsp,
fsp->op->global->open_persistent_id,
in_offset,
in_data.length,
WRITE_LOCK,
&lock);
if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
return tevent_req_post(req, ev);
}
nwritten = write_file(smbreq, fsp,
(const char *)in_data.data,
in_offset,
in_data.length);
status = smb2_write_complete(req, nwritten, errno);
SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
DEBUG(10,("smb2: write on "
"file %s, offset %.0f, requested %u, written = %u\n",
fsp_str_dbg(fsp),
(double)in_offset,
(unsigned int)in_data.length,
(unsigned int)nwritten ));
if (!NT_STATUS_IS_OK(status)) {
tevent_req_nterror(req, status);
} else {
/* Success. */
tevent_req_done(req);
}
return tevent_req_post(req, ev);
}
static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(subreq,
struct tevent_req);
struct smbd_smb2_write_state *state = tevent_req_data(req,
struct smbd_smb2_write_state);
NTSTATUS status;
ssize_t nwritten = -1;
status = np_write_recv(subreq, &nwritten);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
NTSTATUS old = status;
status = nt_status_np_pipe(old);
tevent_req_nterror(req, status);
return;
}
if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
return;
}
state->out_count = nwritten;
tevent_req_done(req);
}
static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
uint32_t *out_count)
{
NTSTATUS status;
struct smbd_smb2_write_state *state = tevent_req_data(req,
struct smbd_smb2_write_state);
if (tevent_req_is_nterror(req, &status)) {
tevent_req_received(req);
return status;
}
*out_count = state->out_count;
tevent_req_received(req);
return NT_STATUS_OK;
}