source: vendor/current/libcli/smb/smb2cli_write.c

/*
   Unix SMB/CIFS implementation.
   smb2 lib
   Copyright (C) Volker Lendecke 2011

   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 "system/network.h"
#include "lib/util/tevent_ntstatus.h"
#include "smb_common.h"
#include "smbXcli_base.h"

struct smb2cli_write_state {
        uint8_t fixed[48];
        uint8_t dyn_pad[1];
        uint32_t written;
};

static void smb2cli_write_done(struct tevent_req *subreq);

struct tevent_req *smb2cli_write_send(TALLOC_CTX *mem_ctx,
                                      struct tevent_context *ev,
                                      struct smbXcli_conn *conn,
                                      uint32_t timeout_msec,
                                      struct smbXcli_session *session,
                                      struct smbXcli_tcon *tcon,
                                      uint32_t length,
                                      uint64_t offset,
                                      uint64_t fid_persistent,
                                      uint64_t fid_volatile,
                                      uint32_t remaining_bytes,
                                      uint32_t flags,
                                      const uint8_t *data)
{
        struct tevent_req *req, *subreq;
        struct smb2cli_write_state *state;
        uint8_t *fixed;
        const uint8_t *dyn;
        size_t dyn_len;

        req = tevent_req_create(mem_ctx, &state,
                                struct smb2cli_write_state);
        if (req == NULL) {
                return NULL;
        }

        fixed = state->fixed;

        SSVAL(fixed, 0, 49);
        SSVAL(fixed, 2, SMB2_HDR_BODY + 48);
        SIVAL(fixed, 4, length);
        SBVAL(fixed, 8, offset);
        SBVAL(fixed, 16, fid_persistent);
        SBVAL(fixed, 24, fid_volatile);
        SIVAL(fixed, 36, remaining_bytes);
        SIVAL(fixed, 44, flags);

        if (length > 0) {
                dyn = data;
                dyn_len = length;
        } else {
                dyn = state->dyn_pad;;
                dyn_len = sizeof(state->dyn_pad);
        }

        subreq = smb2cli_req_send(state, ev, conn, SMB2_OP_WRITE,
                                  0, 0, /* flags */
                                  timeout_msec,
                                  tcon,
                                  session,
                                  state->fixed, sizeof(state->fixed),
                                  dyn, dyn_len,
                                  0); /* max_dyn_len */
        if (tevent_req_nomem(subreq, req)) {
                return tevent_req_post(req, ev);
        }
        tevent_req_set_callback(subreq, smb2cli_write_done, req);
        return req;
}

static void smb2cli_write_done(struct tevent_req *subreq)
{
        struct tevent_req *req =
                tevent_req_callback_data(subreq,
                struct tevent_req);
        struct smb2cli_write_state *state =
                tevent_req_data(req,
                struct smb2cli_write_state);
        NTSTATUS status;
        struct iovec *iov;
        static const struct smb2cli_req_expected_response expected[] = {
        {
                .status = NT_STATUS_OK,
                .body_size = 0x11
        }
        };

        status = smb2cli_req_recv(subreq, state, &iov,
                                  expected, ARRAY_SIZE(expected));
        TALLOC_FREE(subreq);
        if (tevent_req_nterror(req, status)) {
                return;
        }
        state->written = IVAL(iov[1].iov_base, 4);
        tevent_req_done(req);
}

NTSTATUS smb2cli_write_recv(struct tevent_req *req, uint32_t *written)
{
        struct smb2cli_write_state *state =
                tevent_req_data(req,
                struct smb2cli_write_state);
        NTSTATUS status;

        if (tevent_req_is_nterror(req, &status)) {
                tevent_req_received(req);
                return status;
        }
        if (written) {
                *written = state->written;
        }
        tevent_req_received(req);
        return NT_STATUS_OK;
}

NTSTATUS smb2cli_write(struct smbXcli_conn *conn,
                       uint32_t timeout_msec,
                       struct smbXcli_session *session,
                       struct smbXcli_tcon *tcon,
                       uint32_t length,
                       uint64_t offset,
                       uint64_t fid_persistent,
                       uint64_t fid_volatile,
                       uint32_t remaining_bytes,
                       uint32_t flags,
                       const uint8_t *data,
                       uint32_t *written)
{
        TALLOC_CTX *frame = talloc_stackframe();
        struct tevent_context *ev;
        struct tevent_req *req;
        NTSTATUS status = NT_STATUS_NO_MEMORY;

        if (smbXcli_conn_has_async_calls(conn)) {
                /*
                 * Can't use sync call while an async call is in flight
                 */
                status = NT_STATUS_INVALID_PARAMETER;
                goto fail;
        }
        ev = samba_tevent_context_init(frame);
        if (ev == NULL) {
                goto fail;
        }
        req = smb2cli_write_send(frame, ev, conn, timeout_msec,
                                 session, tcon,
                                 length, offset,
                                 fid_persistent, fid_volatile,
                                 remaining_bytes, flags, data);
        if (req == NULL) {
                goto fail;
        }
        if (!tevent_req_poll_ntstatus(req, ev, &status)) {
                goto fail;
        }
        status = smb2cli_write_recv(req, written);
 fail:
        TALLOC_FREE(frame);
        return status;
}