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                                                struct files_struct *fsp);
  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         uint64_t in_file_id_persistent;
  39         uint64_t in_file_id_volatile;
  40         struct files_struct *in_fsp;
  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 = SMBD_SMB2_IN_BODY_PTR(req);
  48
  49         in_file_id_persistent   = BVAL(inbody, 0x08);
  50         in_file_id_volatile     = BVAL(inbody, 0x10);
  51
  52         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
  53         if (in_fsp == NULL) {
  54                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  55         }
  56
  57         subreq = smbd_smb2_flush_send(req, req->sconn->ev_ctx,
  58                                       req, in_fsp);
  59         if (subreq == NULL) {
  60                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  61         }
  62         tevent_req_set_callback(subreq, smbd_smb2_request_flush_done, req);
  63
  64         return smbd_smb2_request_pending_queue(req, subreq, 500);
  65 }
  66
  67 static void smbd_smb2_request_flush_done(struct tevent_req *subreq)
  68 {
  69         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
  70                                         struct smbd_smb2_request);
  71         DATA_BLOB outbody;
  72         NTSTATUS status;
  73         NTSTATUS error; /* transport error */
  74
  75         status = smbd_smb2_flush_recv(subreq);
  76         TALLOC_FREE(subreq);
  77         if (!NT_STATUS_IS_OK(status)) {
  78                 error = smbd_smb2_request_error(req, status);
  79                 if (!NT_STATUS_IS_OK(error)) {
  80                         smbd_server_connection_terminate(req->sconn,
  81                                                          nt_errstr(error));
  82                         return;
  83                 }
  84                 return;
  85         }
  86
  87         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
  88         if (outbody.data == NULL) {
  89                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  90                 if (!NT_STATUS_IS_OK(error)) {
  91                         smbd_server_connection_terminate(req->sconn,
  92                                                          nt_errstr(error));
  93                         return;
  94                 }
  95                 return;
  96         }
  97
  98         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
  99         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 100
 101         error = smbd_smb2_request_done(req, outbody, NULL);
 102         if (!NT_STATUS_IS_OK(error)) {
 103                 smbd_server_connection_terminate(req->sconn,
 104                                                  nt_errstr(error));
 105                 return;
 106         }
 107 }
 108
 109 struct smbd_smb2_flush_state {
 110         struct smbd_smb2_request *smb2req;
 111 };
 112
 113 static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
 114                                                struct tevent_context *ev,
 115                                                struct smbd_smb2_request *smb2req,
 116                                                struct files_struct *fsp)
 117 {
 118         struct tevent_req *req;
 119         struct smbd_smb2_flush_state *state;
 120         NTSTATUS status;
 121         struct smb_request *smbreq;
 122
 123         req = tevent_req_create(mem_ctx, &state,
 124                                 struct smbd_smb2_flush_state);
 125         if (req == NULL) {
 126                 return NULL;
 127         }
 128         state->smb2req = smb2req;
 129
 130         DEBUG(10,("smbd_smb2_flush: %s - %s\n",
 131                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 132
 133         smbreq = smbd_smb2_fake_smb_request(smb2req);
 134         if (tevent_req_nomem(smbreq, req)) {
 135                 return tevent_req_post(req, ev);
 136         }
 137
 138         if (IS_IPC(smbreq->conn)) {
 139                 tevent_req_nterror(req, NT_STATUS_NOT_IMPLEMENTED);
 140                 return tevent_req_post(req, ev);
 141         }
 142
 143         if (!CHECK_WRITE(fsp)) {
 144                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 145                 return tevent_req_post(req, ev);
 146         }
 147
 148         status = sync_file(smbreq->conn, fsp, true);
 149         if (!NT_STATUS_IS_OK(status)) {
 150                 DEBUG(5,("smbd_smb2_flush: sync_file for %s returned %s\n",
 151                          fsp_str_dbg(fsp), nt_errstr(status)));
 152                 tevent_req_nterror(req, status);
 153                 return tevent_req_post(req, ev);
 154         }
 155
 156         tevent_req_done(req);
 157         return tevent_req_post(req, ev);
 158 }
 159
 160 static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req)
 161 {
 162         NTSTATUS status;
 163
 164         if (tevent_req_is_nterror(req, &status)) {
 165                 tevent_req_received(req);
 166                 return status;
 167         }
 168
 169         tevent_req_received(req);
 170         return NT_STATUS_OK;
 171 }