source3/smbd/smb2_flush.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smbd/smbd.h"
  23 #include "smbd/globals.h"
  24 #include "../libcli/smb/smb_common.h"
  25 #include "../lib/util/tevent_ntstatus.h"
  26 #include "libcli/security/security.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_SMB2
  30
  31 static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
  32                                                struct tevent_context *ev,
  33                                                struct smbd_smb2_request *smb2req,
  34                                                struct files_struct *fsp);
  35 static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req);
  36
  37 static void smbd_smb2_request_flush_done(struct tevent_req *subreq);
  38 NTSTATUS smbd_smb2_request_process_flush(struct smbd_smb2_request *req)
  39 {
  40         NTSTATUS status;
  41         const uint8_t *inbody;
  42         uint64_t in_file_id_persistent;
  43         uint64_t in_file_id_volatile;
  44         struct files_struct *in_fsp;
  45         struct tevent_req *subreq;
  46
  47         status = smbd_smb2_request_verify_sizes(req, 0x18);
  48         if (!NT_STATUS_IS_OK(status)) {
  49                 return smbd_smb2_request_error(req, status);
  50         }
  51         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  52
  53         in_file_id_persistent   = BVAL(inbody, 0x08);
  54         in_file_id_volatile     = BVAL(inbody, 0x10);
  55
  56         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
  57         if (in_fsp == NULL) {
  58                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  59         }
  60
  61         subreq = smbd_smb2_flush_send(req, req->sconn->ev_ctx,
  62                                       req, in_fsp);
  63         if (subreq == NULL) {
  64                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  65         }
  66         tevent_req_set_callback(subreq, smbd_smb2_request_flush_done, req);
  67
  68         return smbd_smb2_request_pending_queue(req, subreq, 500);
  69 }
  70
  71 static void smbd_smb2_request_flush_done(struct tevent_req *subreq)
  72 {
  73         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
  74                                         struct smbd_smb2_request);
  75         DATA_BLOB outbody;
  76         NTSTATUS status;
  77         NTSTATUS error; /* transport error */
  78
  79         status = smbd_smb2_flush_recv(subreq);
  80         TALLOC_FREE(subreq);
  81         if (!NT_STATUS_IS_OK(status)) {
  82                 error = smbd_smb2_request_error(req, status);
  83                 if (!NT_STATUS_IS_OK(error)) {
  84                         smbd_server_connection_terminate(req->xconn,
  85                                                          nt_errstr(error));
  86                         return;
  87                 }
  88                 return;
  89         }
  90
  91         outbody = smbd_smb2_generate_outbody(req, 0x04);
  92         if (outbody.data == NULL) {
  93                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  94                 if (!NT_STATUS_IS_OK(error)) {
  95                         smbd_server_connection_terminate(req->xconn,
  96                                                          nt_errstr(error));
  97                         return;
  98                 }
  99                 return;
 100         }
 101
 102         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 103         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 104
 105         error = smbd_smb2_request_done(req, outbody, NULL);
 106         if (!NT_STATUS_IS_OK(error)) {
 107                 smbd_server_connection_terminate(req->xconn,
 108                                                  nt_errstr(error));
 109                 return;
 110         }
 111 }
 112
 113 struct smbd_smb2_flush_state {
 114         struct smbd_smb2_request *smb2req;
 115         struct files_struct *fsp;
 116 };
 117
 118 static void smbd_smb2_flush_done(struct tevent_req *subreq);
 119
 120 static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
 121                                                struct tevent_context *ev,
 122                                                struct smbd_smb2_request *smb2req,
 123                                                struct files_struct *fsp)
 124 {
 125         struct tevent_req *req;
 126         struct tevent_req *subreq;
 127         struct smbd_smb2_flush_state *state;
 128         struct smb_request *smbreq;
 129         bool is_compound = false;
 130         bool is_last_in_compound = false;
 131
 132         req = tevent_req_create(mem_ctx, &state,
 133                                 struct smbd_smb2_flush_state);
 134         if (req == NULL) {
 135                 return NULL;
 136         }
 137         state->smb2req = smb2req;
 138         state->fsp = fsp;
 139
 140         DEBUG(10,("smbd_smb2_flush: %s - %s\n",
 141                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 142
 143         smbreq = smbd_smb2_fake_smb_request(smb2req);
 144         if (tevent_req_nomem(smbreq, req)) {
 145                 return tevent_req_post(req, ev);
 146         }
 147
 148         if (IS_IPC(smbreq->conn)) {
 149                 tevent_req_nterror(req, NT_STATUS_NOT_IMPLEMENTED);
 150                 return tevent_req_post(req, ev);
 151         }
 152
 153         if (!CHECK_WRITE(fsp)) {
 154                 bool allow_dir_flush = false;
 155                 uint32_t flush_access = FILE_ADD_FILE | FILE_ADD_SUBDIRECTORY;
 156
 157                 if (!fsp->fsp_flags.is_directory) {
 158                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 159                         return tevent_req_post(req, ev);
 160                 }
 161
 162                 /*
 163                  * Directories are not writable in the conventional
 164                  * sense, but if opened with *either*
 165                  * FILE_ADD_FILE or FILE_ADD_SUBDIRECTORY
 166                  * they can be flushed.
 167                  */
 168
 169                 if ((fsp->access_mask & flush_access) != 0) {
 170                         allow_dir_flush = true;
 171                 }
 172
 173                 if (allow_dir_flush == false) {
 174                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 175                         return tevent_req_post(req, ev);
 176                 }
 177         }
 178
 179         if (fsp_get_io_fd(fsp) == -1) {
 180                 tevent_req_nterror(req, NT_STATUS_INVALID_HANDLE);
 181                 return tevent_req_post(req, ev);
 182         }
 183
 184         if (!lp_strict_sync(SNUM(smbreq->conn))) {
 185                 /*
 186                  * No strict sync. Don't really do
 187                  * anything here.
 188                  */
 189                 tevent_req_done(req);
 190                 return tevent_req_post(req, ev);
 191         }
 192
 193         subreq = SMB_VFS_FSYNC_SEND(state, ev, fsp);
 194         if (tevent_req_nomem(subreq, req)) {
 195                 return tevent_req_post(req, ev);
 196         }
 197
 198         tevent_req_set_callback(subreq, smbd_smb2_flush_done, req);
 199
 200         is_compound = smbd_smb2_is_compound(smb2req);
 201         is_last_in_compound = smbd_smb2_is_last_in_compound(smb2req);
 202
 203         if (is_compound && !is_last_in_compound) {
 204                 /*
 205                  * Can't go async if we're not the
 206                  * last request in a compound request.
 207                  * Cause this request to complete synchronously.
 208                  */
 209                 smb2_request_set_async_internal(state->smb2req, true);
 210         }
 211
 212         /* Ensure any close request knows about this outstanding IO. */
 213         if (!aio_add_req_to_fsp(fsp, req)) {
 214                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 215                 return tevent_req_post(req, ev);
 216         }
 217
 218         return req;
 219
 220 }
 221
 222 static void smbd_smb2_flush_done(struct tevent_req *subreq)
 223 {
 224         struct tevent_req *req = tevent_req_callback_data(
 225                 subreq, struct tevent_req);
 226         struct smbd_smb2_flush_state *state = tevent_req_data(
 227                 req, struct smbd_smb2_flush_state);
 228         int ret;
 229         struct vfs_aio_state vfs_aio_state;
 230
 231         ret = SMB_VFS_FSYNC_RECV(subreq, &vfs_aio_state);
 232         TALLOC_FREE(subreq);
 233         if (ret == -1) {
 234                 tevent_req_nterror(req, map_nt_error_from_unix(vfs_aio_state.error));
 235                 return;
 236         }
 237         if (state->fsp->fsp_flags.modified) {
 238                 trigger_write_time_update_immediate(state->fsp);
 239         }
 240         tevent_req_done(req);
 241 }
 242
 243 static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req)
 244 {
 245         NTSTATUS status;
 246
 247         if (tevent_req_is_nterror(req, &status)) {
 248                 tevent_req_received(req);
 249                 return status;
 250         }
 251
 252         tevent_req_received(req);
 253         return NT_STATUS_OK;
 254 }