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         const uint8_t *inhdr;
  37         const uint8_t *inbody;
  38         int i = req->current_idx;
  39         size_t expected_body_size = 0x18;
  40         size_t body_size;
  41         uint64_t in_file_id_persistent;
  42         uint64_t in_file_id_volatile;
  43         struct tevent_req *subreq;
  44
  45         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  46         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  47                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  48         }
  49
  50         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  51
  52         body_size = SVAL(inbody, 0x00);
  53         if (body_size != expected_body_size) {
  54                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  55         }
  56
  57         in_file_id_persistent   = BVAL(inbody, 0x08);
  58         in_file_id_volatile     = BVAL(inbody, 0x10);
  59
  60         if (req->compat_chain_fsp) {
  61                 /* skip check */
  62         } else if (in_file_id_persistent != in_file_id_volatile) {
  63                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  64         }
  65
  66         subreq = smbd_smb2_flush_send(req,
  67                                       req->sconn->smb2.event_ctx,
  68                                       req,
  69                                       in_file_id_volatile);
  70         if (subreq == NULL) {
  71                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  72         }
  73         tevent_req_set_callback(subreq, smbd_smb2_request_flush_done, req);
  74
  75         return smbd_smb2_request_pending_queue(req, subreq);
  76 }
  77
  78 static void smbd_smb2_request_flush_done(struct tevent_req *subreq)
  79 {
  80         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
  81                                         struct smbd_smb2_request);
  82         DATA_BLOB outbody;
  83         NTSTATUS status;
  84         NTSTATUS error; /* transport error */
  85
  86         status = smbd_smb2_flush_recv(subreq);
  87         TALLOC_FREE(subreq);
  88         if (!NT_STATUS_IS_OK(status)) {
  89                 error = smbd_smb2_request_error(req, status);
  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         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
  99         if (outbody.data == NULL) {
 100                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 101                 if (!NT_STATUS_IS_OK(error)) {
 102                         smbd_server_connection_terminate(req->sconn,
 103                                                          nt_errstr(error));
 104                         return;
 105                 }
 106                 return;
 107         }
 108
 109         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 110         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 111
 112         error = smbd_smb2_request_done(req, outbody, NULL);
 113         if (!NT_STATUS_IS_OK(error)) {
 114                 smbd_server_connection_terminate(req->sconn,
 115                                                  nt_errstr(error));
 116                 return;
 117         }
 118 }
 119
 120 struct smbd_smb2_flush_state {
 121         struct smbd_smb2_request *smb2req;
 122 };
 123
 124 static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
 125                                                struct tevent_context *ev,
 126                                                struct smbd_smb2_request *smb2req,
 127                                                uint64_t in_file_id_volatile)
 128 {
 129         struct tevent_req *req;
 130         struct smbd_smb2_flush_state *state;
 131         NTSTATUS status;
 132         struct smb_request *smbreq;
 133         files_struct *fsp;
 134
 135         req = tevent_req_create(mem_ctx, &state,
 136                                 struct smbd_smb2_flush_state);
 137         if (req == NULL) {
 138                 return NULL;
 139         }
 140         state->smb2req = smb2req;
 141
 142         DEBUG(10,("smbd_smb2_flush: file_id[0x%016llX]\n",
 143                   (unsigned long long)in_file_id_volatile));
 144
 145         smbreq = smbd_smb2_fake_smb_request(smb2req);
 146         if (tevent_req_nomem(smbreq, req)) {
 147                 return tevent_req_post(req, ev);
 148         }
 149
 150         if (IS_IPC(smbreq->conn)) {
 151                 tevent_req_nterror(req, NT_STATUS_NOT_IMPLEMENTED);
 152                 return tevent_req_post(req, ev);
 153         }
 154
 155         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 156         if (fsp == NULL) {
 157                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 158                 return tevent_req_post(req, ev);
 159         }
 160         if (smbreq->conn != fsp->conn) {
 161                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 162                 return tevent_req_post(req, ev);
 163         }
 164         if (smb2req->session->vuid != fsp->vuid) {
 165                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 166                 return tevent_req_post(req, ev);
 167         }
 168
 169         if (!CHECK_WRITE(fsp)) {
 170                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 171                 return tevent_req_post(req, ev);
 172         }
 173
 174         status = sync_file(smbreq->conn, fsp, true);
 175         if (!NT_STATUS_IS_OK(status)) {
 176                 DEBUG(5,("smbd_smb2_flush: sync_file for %s returned %s\n",
 177                          fsp_str_dbg(fsp), nt_errstr(status)));
 178                 tevent_req_nterror(req, status);
 179                 return tevent_req_post(req, ev);
 180         }
 181
 182         tevent_req_done(req);
 183         return tevent_req_post(req, ev);
 184 }
 185
 186 static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req)
 187 {
 188         NTSTATUS status;
 189
 190         if (tevent_req_is_nterror(req, &status)) {
 191                 tevent_req_received(req);
 192                 return status;
 193         }
 194
 195         tevent_req_received(req);
 196         return NT_STATUS_OK;
 197 }