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
  26 static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
  27                                                struct tevent_context *ev,
  28                                                struct smbd_smb2_request *smb2req,
  29                                                uint64_t in_file_id_volatile);
  30 static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req);
  31
  32 static void smbd_smb2_request_flush_done(struct tevent_req *subreq);
  33 NTSTATUS smbd_smb2_request_process_flush(struct smbd_smb2_request *req)
  34 {
  35         const uint8_t *inhdr;
  36         const uint8_t *inbody;
  37         int i = req->current_idx;
  38         size_t expected_body_size = 0x18;
  39         size_t body_size;
  40         uint64_t in_file_id_persistent;
  41         uint64_t in_file_id_volatile;
  42         struct tevent_req *subreq;
  43
  44         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  45         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  46                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  47         }
  48
  49         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  50
  51         body_size = SVAL(inbody, 0x00);
  52         if (body_size != expected_body_size) {
  53                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  54         }
  55
  56         in_file_id_persistent   = BVAL(inbody, 0x08);
  57         in_file_id_volatile     = BVAL(inbody, 0x10);
  58
  59         if (req->compat_chain_fsp) {
  60                 /* skip check */
  61         } else if (in_file_id_persistent != in_file_id_volatile) {
  62                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  63         }
  64
  65         subreq = smbd_smb2_flush_send(req,
  66                                       req->sconn->smb2.event_ctx,
  67                                       req,
  68                                       in_file_id_volatile);
  69         if (subreq == NULL) {
  70                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  71         }
  72         tevent_req_set_callback(subreq, smbd_smb2_request_flush_done, req);
  73
  74         return smbd_smb2_request_pending_queue(req, subreq);
  75 }
  76
  77 static void smbd_smb2_request_flush_done(struct tevent_req *subreq)
  78 {
  79         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
  80                                         struct smbd_smb2_request);
  81         DATA_BLOB outbody;
  82         NTSTATUS status;
  83         NTSTATUS error; /* transport error */
  84
  85         status = smbd_smb2_flush_recv(subreq);
  86         TALLOC_FREE(subreq);
  87         if (!NT_STATUS_IS_OK(status)) {
  88                 error = smbd_smb2_request_error(req, status);
  89                 if (!NT_STATUS_IS_OK(error)) {
  90                         smbd_server_connection_terminate(req->sconn,
  91                                                          nt_errstr(error));
  92                         return;
  93                 }
  94                 return;
  95         }
  96
  97         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
  98         if (outbody.data == NULL) {
  99                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 100                 if (!NT_STATUS_IS_OK(error)) {
 101                         smbd_server_connection_terminate(req->sconn,
 102                                                          nt_errstr(error));
 103                         return;
 104                 }
 105                 return;
 106         }
 107
 108         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 109         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 110
 111         error = smbd_smb2_request_done(req, outbody, NULL);
 112         if (!NT_STATUS_IS_OK(error)) {
 113                 smbd_server_connection_terminate(req->sconn,
 114                                                  nt_errstr(error));
 115                 return;
 116         }
 117 }
 118
 119 struct smbd_smb2_flush_state {
 120         struct smbd_smb2_request *smb2req;
 121 };
 122
 123 static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
 124                                                struct tevent_context *ev,
 125                                                struct smbd_smb2_request *smb2req,
 126                                                uint64_t in_file_id_volatile)
 127 {
 128         struct tevent_req *req;
 129         struct smbd_smb2_flush_state *state;
 130         NTSTATUS status;
 131         struct smb_request *smbreq;
 132         files_struct *fsp;
 133
 134         req = tevent_req_create(mem_ctx, &state,
 135                                 struct smbd_smb2_flush_state);
 136         if (req == NULL) {
 137                 return NULL;
 138         }
 139         state->smb2req = smb2req;
 140
 141         DEBUG(10,("smbd_smb2_flush: file_id[0x%016llX]\n",
 142                   (unsigned long long)in_file_id_volatile));
 143
 144         smbreq = smbd_smb2_fake_smb_request(smb2req);
 145         if (tevent_req_nomem(smbreq, req)) {
 146                 return tevent_req_post(req, ev);
 147         }
 148
 149         if (IS_IPC(smbreq->conn)) {
 150                 tevent_req_nterror(req, NT_STATUS_NOT_IMPLEMENTED);
 151                 return tevent_req_post(req, ev);
 152         }
 153
 154         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 155         if (fsp == NULL) {
 156                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 157                 return tevent_req_post(req, ev);
 158         }
 159         if (smbreq->conn != fsp->conn) {
 160                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 161                 return tevent_req_post(req, ev);
 162         }
 163         if (smb2req->session->vuid != fsp->vuid) {
 164                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 165                 return tevent_req_post(req, ev);
 166         }
 167
 168         if (!CHECK_WRITE(fsp)) {
 169                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 170                 return tevent_req_post(req, ev);
 171         }
 172
 173         status = sync_file(smbreq->conn, fsp, true);
 174         if (!NT_STATUS_IS_OK(status)) {
 175                 DEBUG(5,("smbd_smb2_flush: sync_file for %s returned %s\n",
 176                          fsp_str_dbg(fsp), nt_errstr(status)));
 177                 tevent_req_nterror(req, status);
 178                 return tevent_req_post(req, ev);
 179         }
 180
 181         tevent_req_done(req);
 182         return tevent_req_post(req, ev);
 183 }
 184
 185 static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req)
 186 {
 187         NTSTATUS status;
 188
 189         if (tevent_req_is_nterror(req, &status)) {
 190                 tevent_req_received(req);
 191                 return status;
 192         }
 193
 194         tevent_req_received(req);
 195         return NT_STATUS_OK;
 196 }