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samba-mirror/source3/smbd/smb2_write.c

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/*
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,
uint32_t in_smbpid,
uint64_t in_file_id_volatile,
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)
{
const uint8_t *inhdr;
const uint8_t *inbody;
int i = req->current_idx;
size_t expected_body_size = 0x31;
size_t body_size;
uint32_t in_smbpid;
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;
uint32_t in_flags;
struct tevent_req *subreq;
inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
body_size = SVAL(inbody, 0x00);
if (body_size != expected_body_size) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
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 + (body_size & 0xFFFFFFFE))) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
if (in_data_length > req->in.vector[i+2].iov_len) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
/* check the max write size */
if (in_data_length > lp_smb2_max_write()) {
/* This is a warning. */
DEBUG(2,("smbd_smb2_request_process_write : "
"client ignored max write :%s: 0x%08X: 0x%08X\n",
__location__, in_data_length, lp_smb2_max_write()));
#if 0
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
#endif
}
in_data_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
in_data_buffer.length = in_data_length;
if (req->compat_chain_fsp) {
/* skip check */
} else if (in_file_id_persistent != in_file_id_volatile) {
return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
}
subreq = smbd_smb2_write_send(req,
req->sconn->smb2.event_ctx,
req,
in_smbpid,
in_file_id_volatile,
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);
}
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);
int i = req->current_idx;
uint8_t *outhdr;
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;
}
outhdr = (uint8_t *)req->out.vector[i].iov_base;
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;
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);
NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
{
NTSTATUS status;
struct smbd_smb2_write_state *state = tevent_req_data(req,
struct smbd_smb2_write_state);
files_struct *fsp = state->fsp;
DEBUG(3,("smb2: fnum=[%d/%s] "
"length=%lu offset=%lu wrote=%lu\n",
fsp->fnum,
fsp_str_dbg(fsp),
(unsigned long)state->in_length,
(unsigned long)state->in_offset,
(unsigned long)nwritten));
if (nwritten == -1) {
return map_nt_error_from_unix(err);
}
if ((nwritten == 0) && (state->in_length != 0)) {
DEBUG(5,("smb2: write [%s] disk full\n",
fsp_str_dbg(fsp)));
return NT_STATUS_DISK_FULL;
}
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;
}
static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbd_smb2_request *smb2req,
uint32_t in_smbpid,
uint64_t in_file_id_volatile,
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_conn;
files_struct *fsp = NULL;
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: file_id[0x%016llX]\n",
(unsigned long long)in_file_id_volatile));
smbreq = smbd_smb2_fake_smb_request(smb2req);
if (tevent_req_nomem(smbreq, req)) {
return tevent_req_post(req, ev);
}
fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
if (fsp == NULL) {
tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
return tevent_req_post(req, ev);
}
if (conn != fsp->conn) {
tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
return tevent_req_post(req, ev);
}
if (smb2req->session->vuid != fsp->vuid) {
tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
return tevent_req_post(req, ev);
}
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, server_event_context(),
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. Don't
* send a "gone async" message
* as we expect this to be less
* than the client timeout period.
* JRA. FIXME for offline files..
* FIXME - add cancel code..
*/
smb2req->async = true;
return req;
}
if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
/* Real error in setting up aio. Fail. */
tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
return tevent_req_post(req, ev);
}
/* Fallback to synchronous. */
init_strict_lock_struct(fsp,
in_file_id_volatile,
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)) {
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;
}