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 };
 116
 117 static void smbd_smb2_flush_done(struct tevent_req *subreq);
 118
 119 static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
 120                                                struct tevent_context *ev,
 121                                                struct smbd_smb2_request *smb2req,
 122                                                struct files_struct *fsp)
 123 {
 124         struct tevent_req *req;
 125         struct tevent_req *subreq;
 126         struct smbd_smb2_flush_state *state;
 127         struct smb_request *smbreq;
 128         int ret;
 129
 130         req = tevent_req_create(mem_ctx, &state,
 131                                 struct smbd_smb2_flush_state);
 132         if (req == NULL) {
 133                 return NULL;
 134         }
 135         state->smb2req = smb2req;
 136
 137         DEBUG(10,("smbd_smb2_flush: %s - %s\n",
 138                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 139
 140         smbreq = smbd_smb2_fake_smb_request(smb2req);
 141         if (tevent_req_nomem(smbreq, req)) {
 142                 return tevent_req_post(req, ev);
 143         }
 144
 145         if (IS_IPC(smbreq->conn)) {
 146                 tevent_req_nterror(req, NT_STATUS_NOT_IMPLEMENTED);
 147                 return tevent_req_post(req, ev);
 148         }
 149
 150         if (!CHECK_WRITE(fsp)) {
 151                 bool allow_dir_flush = false;
 152                 uint32_t flush_access = FILE_ADD_FILE | FILE_ADD_SUBDIRECTORY;
 153
 154                 if (!fsp->is_directory) {
 155                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 156                         return tevent_req_post(req, ev);
 157                 }
 158
 159                 /*
 160                  * Directories are not writable in the conventional
 161                  * sense, but if opened with *either*
 162                  * FILE_ADD_FILE or FILE_ADD_SUBDIRECTORY
 163                  * they can be flushed.
 164                  */
 165
 166                 if ((fsp->access_mask & flush_access) != 0) {
 167                         allow_dir_flush = true;
 168                 }
 169
 170                 if (allow_dir_flush == false) {
 171                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 172                         return tevent_req_post(req, ev);
 173                 }
 174         }
 175
 176         if (fsp->fh->fd == -1) {
 177                 tevent_req_nterror(req, NT_STATUS_INVALID_HANDLE);
 178                 return tevent_req_post(req, ev);
 179         }
 180
 181         if (!lp_strict_sync(SNUM(smbreq->conn))) {
 182                 /*
 183                  * No strict sync. Don't really do
 184                  * anything here.
 185                  */
 186                 tevent_req_done(req);
 187                 return tevent_req_post(req, ev);
 188         }
 189
 190         ret = flush_write_cache(fsp, SAMBA_SYNC_FLUSH);
 191         if (ret == -1) {
 192                 tevent_req_nterror(req,  map_nt_error_from_unix(errno));
 193                 return tevent_req_post(req, ev);
 194         }
 195
 196         subreq = SMB_VFS_FSYNC_SEND(state, ev, fsp);
 197         if (tevent_req_nomem(subreq, req)) {
 198                 return tevent_req_post(req, ev);
 199         }
 200
 201         tevent_req_set_callback(subreq, smbd_smb2_flush_done, req);
 202
 203         /* Ensure any close request knows about this outstanding IO. */
 204         if (!aio_add_req_to_fsp(fsp, req)) {
 205                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 206                 return tevent_req_post(req, ev);
 207         }
 208
 209         increment_outstanding_aio_calls();
 210         return req;
 211
 212 }
 213
 214 static void smbd_smb2_flush_done(struct tevent_req *subreq)
 215 {
 216         struct tevent_req *req = tevent_req_callback_data(
 217                 subreq, struct tevent_req);
 218         int ret;
 219         struct vfs_aio_state vfs_aio_state;
 220
 221         decrement_outstanding_aio_calls();
 222
 223         ret = SMB_VFS_FSYNC_RECV(subreq, &vfs_aio_state);
 224         TALLOC_FREE(subreq);
 225         if (ret == -1) {
 226                 tevent_req_nterror(req, map_nt_error_from_unix(vfs_aio_state.error));
 227                 return;
 228         }
 229         tevent_req_done(req);
 230 }
 231
 232 static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req)
 233 {
 234         NTSTATUS status;
 235
 236         if (tevent_req_is_nterror(req, &status)) {
 237                 tevent_req_received(req);
 238                 return status;
 239         }
 240
 241         tevent_req_received(req);
 242         return NT_STATUS_OK;
 243 }