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
  27 static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
  28                                                struct tevent_context *ev,
  29                                                struct smbd_smb2_request *smb2req,
  30                                                uint64_t in_file_id_volatile);
  31 static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req);
  32
  33 static void smbd_smb2_request_flush_done(struct tevent_req *subreq);
  34 NTSTATUS smbd_smb2_request_process_flush(struct smbd_smb2_request *req)
  35 {
  36         NTSTATUS status;
  37         const uint8_t *inbody;
  38         int i = req->current_idx;
  39         uint64_t in_file_id_persistent;
  40         uint64_t in_file_id_volatile;
  41         struct tevent_req *subreq;
  42
  43         status = smbd_smb2_request_verify_sizes(req, 0x18);
  44         if (!NT_STATUS_IS_OK(status)) {
  45                 return smbd_smb2_request_error(req, status);
  46         }
  47         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  48
  49         in_file_id_persistent   = BVAL(inbody, 0x08);
  50         in_file_id_volatile     = BVAL(inbody, 0x10);
  51
  52         if (req->compat_chain_fsp) {
  53                 /* skip check */
  54         } else if (in_file_id_persistent != in_file_id_volatile) {
  55                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  56         }
  57
  58         subreq = smbd_smb2_flush_send(req,
  59                                       req->sconn->smb2.event_ctx,
  60                                       req,
  61                                       in_file_id_volatile);
  62         if (subreq == NULL) {
  63                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  64         }
  65         tevent_req_set_callback(subreq, smbd_smb2_request_flush_done, req);
  66
  67         return smbd_smb2_request_pending_queue(req, subreq);
  68 }
  69
  70 static void smbd_smb2_request_flush_done(struct tevent_req *subreq)
  71 {
  72         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
  73                                         struct smbd_smb2_request);
  74         DATA_BLOB outbody;
  75         NTSTATUS status;
  76         NTSTATUS error; /* transport error */
  77
  78         status = smbd_smb2_flush_recv(subreq);
  79         TALLOC_FREE(subreq);
  80         if (!NT_STATUS_IS_OK(status)) {
  81                 error = smbd_smb2_request_error(req, status);
  82                 if (!NT_STATUS_IS_OK(error)) {
  83                         smbd_server_connection_terminate(req->sconn,
  84                                                          nt_errstr(error));
  85                         return;
  86                 }
  87                 return;
  88         }
  89
  90         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
  91         if (outbody.data == NULL) {
  92                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  93                 if (!NT_STATUS_IS_OK(error)) {
  94                         smbd_server_connection_terminate(req->sconn,
  95                                                          nt_errstr(error));
  96                         return;
  97                 }
  98                 return;
  99         }
 100
 101         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 102         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 103
 104         error = smbd_smb2_request_done(req, outbody, NULL);
 105         if (!NT_STATUS_IS_OK(error)) {
 106                 smbd_server_connection_terminate(req->sconn,
 107                                                  nt_errstr(error));
 108                 return;
 109         }
 110 }
 111
 112 struct smbd_smb2_flush_state {
 113         struct smbd_smb2_request *smb2req;
 114 };
 115
 116 static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
 117                                                struct tevent_context *ev,
 118                                                struct smbd_smb2_request *smb2req,
 119                                                uint64_t in_file_id_volatile)
 120 {
 121         struct tevent_req *req;
 122         struct smbd_smb2_flush_state *state;
 123         NTSTATUS status;
 124         struct smb_request *smbreq;
 125         files_struct *fsp;
 126
 127         req = tevent_req_create(mem_ctx, &state,
 128                                 struct smbd_smb2_flush_state);
 129         if (req == NULL) {
 130                 return NULL;
 131         }
 132         state->smb2req = smb2req;
 133
 134         DEBUG(10,("smbd_smb2_flush: file_id[0x%016llX]\n",
 135                   (unsigned long long)in_file_id_volatile));
 136
 137         smbreq = smbd_smb2_fake_smb_request(smb2req);
 138         if (tevent_req_nomem(smbreq, req)) {
 139                 return tevent_req_post(req, ev);
 140         }
 141
 142         if (IS_IPC(smbreq->conn)) {
 143                 tevent_req_nterror(req, NT_STATUS_NOT_IMPLEMENTED);
 144                 return tevent_req_post(req, ev);
 145         }
 146
 147         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 148         if (fsp == NULL) {
 149                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 150                 return tevent_req_post(req, ev);
 151         }
 152         if (smbreq->conn != fsp->conn) {
 153                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 154                 return tevent_req_post(req, ev);
 155         }
 156         if (smb2req->session->vuid != fsp->vuid) {
 157                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 158                 return tevent_req_post(req, ev);
 159         }
 160
 161         if (!CHECK_WRITE(fsp)) {
 162                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 163                 return tevent_req_post(req, ev);
 164         }
 165
 166         status = sync_file(smbreq->conn, fsp, true);
 167         if (!NT_STATUS_IS_OK(status)) {
 168                 DEBUG(5,("smbd_smb2_flush: sync_file for %s returned %s\n",
 169                          fsp_str_dbg(fsp), nt_errstr(status)));
 170                 tevent_req_nterror(req, status);
 171                 return tevent_req_post(req, ev);
 172         }
 173
 174         tevent_req_done(req);
 175         return tevent_req_post(req, ev);
 176 }
 177
 178 static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req)
 179 {
 180         NTSTATUS status;
 181
 182         if (tevent_req_is_nterror(req, &status)) {
 183                 tevent_req_received(req);
 184                 return status;
 185         }
 186
 187         tevent_req_received(req);
 188         return NT_STATUS_OK;
 189 }