libcli/smb/smb2cli_write.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    smb2 lib
   4    Copyright (C) Volker Lendecke 2011
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "system/network.h"
  22 #include "lib/util/tevent_ntstatus.h"
  23 #include "smb_common.h"
  24 #include "smbXcli_base.h"
  25
  26 struct smb2cli_write_state {
  27         uint8_t fixed[48];
  28         uint8_t dyn_pad[1];
  29         uint32_t written;
  30 };
  31
  32 static void smb2cli_write_done(struct tevent_req *subreq);
  33
  34 struct tevent_req *smb2cli_write_send(TALLOC_CTX *mem_ctx,
  35                                       struct tevent_context *ev,
  36                                       struct smbXcli_conn *conn,
  37                                       uint32_t timeout_msec,
  38                                       struct smbXcli_session *session,
  39                                       struct smbXcli_tcon *tcon,
  40                                       uint32_t length,
  41                                       uint64_t offset,
  42                                       uint64_t fid_persistent,
  43                                       uint64_t fid_volatile,
  44                                       uint32_t remaining_bytes,
  45                                       uint32_t flags,
  46                                       const uint8_t *data)
  47 {
  48         struct tevent_req *req, *subreq;
  49         struct smb2cli_write_state *state;
  50         uint8_t *fixed;
  51         const uint8_t *dyn;
  52         size_t dyn_len;
  53
  54         req = tevent_req_create(mem_ctx, &state,
  55                                 struct smb2cli_write_state);
  56         if (req == NULL) {
  57                 return NULL;
  58         }
  59
  60         fixed = state->fixed;
  61
  62         SSVAL(fixed, 0, 49);
  63         SSVAL(fixed, 2, SMB2_HDR_BODY + 48);
  64         SIVAL(fixed, 4, length);
  65         SBVAL(fixed, 8, offset);
  66         SBVAL(fixed, 16, fid_persistent);
  67         SBVAL(fixed, 24, fid_volatile);
  68         SIVAL(fixed, 36, remaining_bytes);
  69         SIVAL(fixed, 44, flags);
  70
  71         if (length > 0) {
  72                 dyn = data;
  73                 dyn_len = length;
  74         } else {
  75                 dyn = state->dyn_pad;;
  76                 dyn_len = sizeof(state->dyn_pad);
  77         }
  78
  79         subreq = smb2cli_req_send(state, ev, conn, SMB2_OP_WRITE,
  80                                   0, 0, /* flags */
  81                                   timeout_msec,
  82                                   tcon,
  83                                   session,
  84                                   state->fixed, sizeof(state->fixed),
  85                                   dyn, dyn_len,
  86                                   0); /* max_dyn_len */
  87         if (tevent_req_nomem(subreq, req)) {
  88                 return tevent_req_post(req, ev);
  89         }
  90         tevent_req_set_callback(subreq, smb2cli_write_done, req);
  91         return req;
  92 }
  93
  94 static void smb2cli_write_done(struct tevent_req *subreq)
  95 {
  96         struct tevent_req *req =
  97                 tevent_req_callback_data(subreq,
  98                 struct tevent_req);
  99         struct smb2cli_write_state *state =
 100                 tevent_req_data(req,
 101                 struct smb2cli_write_state);
 102         NTSTATUS status;
 103         struct iovec *iov;
 104         static const struct smb2cli_req_expected_response expected[] = {
 105         {
 106                 .status = NT_STATUS_OK,
 107                 .body_size = 0x11
 108         }
 109         };
 110
 111         status = smb2cli_req_recv(subreq, state, &iov,
 112                                   expected, ARRAY_SIZE(expected));
 113         TALLOC_FREE(subreq);
 114         if (tevent_req_nterror(req, status)) {
 115                 return;
 116         }
 117         state->written = IVAL(iov[1].iov_base, 4);
 118         tevent_req_done(req);
 119 }
 120
 121 NTSTATUS smb2cli_write_recv(struct tevent_req *req, uint32_t *written)
 122 {
 123         struct smb2cli_write_state *state =
 124                 tevent_req_data(req,
 125                 struct smb2cli_write_state);
 126         NTSTATUS status;
 127
 128         if (tevent_req_is_nterror(req, &status)) {
 129                 tevent_req_received(req);
 130                 return status;
 131         }
 132         if (written) {
 133                 *written = state->written;
 134         }
 135         tevent_req_received(req);
 136         return NT_STATUS_OK;
 137 }
 138
 139 NTSTATUS smb2cli_write(struct smbXcli_conn *conn,
 140                        uint32_t timeout_msec,
 141                        struct smbXcli_session *session,
 142                        struct smbXcli_tcon *tcon,
 143                        uint32_t length,
 144                        uint64_t offset,
 145                        uint64_t fid_persistent,
 146                        uint64_t fid_volatile,
 147                        uint32_t remaining_bytes,
 148                        uint32_t flags,
 149                        const uint8_t *data,
 150                        uint32_t *written)
 151 {
 152         TALLOC_CTX *frame = talloc_stackframe();
 153         struct tevent_context *ev;
 154         struct tevent_req *req;
 155         NTSTATUS status = NT_STATUS_NO_MEMORY;
 156
 157         if (smbXcli_conn_has_async_calls(conn)) {
 158                 /*
 159                  * Can't use sync call while an async call is in flight
 160                  */
 161                 status = NT_STATUS_INVALID_PARAMETER;
 162                 goto fail;
 163         }
 164         ev = samba_tevent_context_init(frame);
 165         if (ev == NULL) {
 166                 goto fail;
 167         }
 168         req = smb2cli_write_send(frame, ev, conn, timeout_msec,
 169                                  session, tcon,
 170                                  length, offset,
 171                                  fid_persistent, fid_volatile,
 172                                  remaining_bytes, flags, data);
 173         if (req == NULL) {
 174                 goto fail;
 175         }
 176         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 177                 goto fail;
 178         }
 179         status = smb2cli_write_recv(req, written);
 180  fail:
 181         TALLOC_FREE(frame);
 182         return status;
 183 }