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/globals.h"
  23 #include "../libcli/smb/smb_common.h"
  24
  25 static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
  26                                                struct tevent_context *ev,
  27                                                struct smbd_smb2_request *smb2req,
  28                                                uint64_t in_file_id_volatile);
  29 static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req);
  30
  31 static void smbd_smb2_request_flush_done(struct tevent_req *subreq);
  32 NTSTATUS smbd_smb2_request_process_flush(struct smbd_smb2_request *req)
  33 {
  34         const uint8_t *inhdr;
  35         const uint8_t *inbody;
  36         int i = req->current_idx;
  37         size_t expected_body_size = 0x18;
  38         size_t body_size;
  39         uint64_t in_file_id_persistent;
  40         uint64_t in_file_id_volatile;
  41         struct tevent_req *subreq;
  42
  43         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
  44         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  45                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  46         }
  47
  48         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  49
  50         body_size = SVAL(inbody, 0x00);
  51         if (body_size != expected_body_size) {
  52                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  53         }
  54
  55         in_file_id_persistent   = BVAL(inbody, 0x08);
  56         in_file_id_volatile     = BVAL(inbody, 0x10);
  57
  58         if (req->compat_chain_fsp) {
  59                 /* skip check */
  60         } else if (in_file_id_persistent != 0) {
  61                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  62         }
  63
  64         subreq = smbd_smb2_flush_send(req,
  65                                       req->sconn->smb2.event_ctx,
  66                                       req,
  67                                       in_file_id_volatile);
  68         if (subreq == NULL) {
  69                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  70         }
  71         tevent_req_set_callback(subreq, smbd_smb2_request_flush_done, req);
  72
  73         if (tevent_req_is_in_progress(subreq)) {
  74                 return smbd_smb2_request_pending_queue(req);
  75         }
  76
  77         return NT_STATUS_OK;
  78 }
  79
  80 static void smbd_smb2_request_flush_done(struct tevent_req *subreq)
  81 {
  82         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
  83                                         struct smbd_smb2_request);
  84         DATA_BLOB outbody;
  85         NTSTATUS status;
  86         NTSTATUS error; /* transport error */
  87
  88         status = smbd_smb2_flush_recv(subreq);
  89         TALLOC_FREE(subreq);
  90         if (!NT_STATUS_IS_OK(status)) {
  91                 error = smbd_smb2_request_error(req, status);
  92                 if (!NT_STATUS_IS_OK(error)) {
  93                         smbd_server_connection_terminate(req->sconn,
  94                                                          nt_errstr(error));
  95                         return;
  96                 }
  97                 return;
  98         }
  99
 100         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 101         if (outbody.data == NULL) {
 102                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 103                 if (!NT_STATUS_IS_OK(error)) {
 104                         smbd_server_connection_terminate(req->sconn,
 105                                                          nt_errstr(error));
 106                         return;
 107                 }
 108                 return;
 109         }
 110
 111         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 112         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 113
 114         error = smbd_smb2_request_done(req, outbody, NULL);
 115         if (!NT_STATUS_IS_OK(error)) {
 116                 smbd_server_connection_terminate(req->sconn,
 117                                                  nt_errstr(error));
 118                 return;
 119         }
 120 }
 121
 122 struct smbd_smb2_flush_state {
 123         struct smbd_smb2_request *smb2req;
 124 };
 125
 126 static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
 127                                                struct tevent_context *ev,
 128                                                struct smbd_smb2_request *smb2req,
 129                                                uint64_t in_file_id_volatile)
 130 {
 131         struct tevent_req *req;
 132         struct smbd_smb2_flush_state *state;
 133         NTSTATUS status;
 134         struct smb_request *smbreq;
 135         files_struct *fsp;
 136
 137         req = tevent_req_create(mem_ctx, &state,
 138                                 struct smbd_smb2_flush_state);
 139         if (req == NULL) {
 140                 return NULL;
 141         }
 142         state->smb2req = smb2req;
 143
 144         DEBUG(10,("smbd_smb2_flush: file_id[0x%016llX]\n",
 145                   (unsigned long long)in_file_id_volatile));
 146
 147         smbreq = smbd_smb2_fake_smb_request(smb2req);
 148         if (tevent_req_nomem(smbreq, req)) {
 149                 return tevent_req_post(req, ev);
 150         }
 151
 152         if (IS_IPC(smbreq->conn)) {
 153                 tevent_req_nterror(req, NT_STATUS_NOT_IMPLEMENTED);
 154                 return tevent_req_post(req, ev);
 155         }
 156
 157         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
 158         if (fsp == NULL) {
 159                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 160                 return tevent_req_post(req, ev);
 161         }
 162         if (smbreq->conn != fsp->conn) {
 163                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 164                 return tevent_req_post(req, ev);
 165         }
 166         if (smb2req->session->vuid != fsp->vuid) {
 167                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
 168                 return tevent_req_post(req, ev);
 169         }
 170
 171         if (!CHECK_WRITE(fsp)) {
 172                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 173                 return tevent_req_post(req, ev);
 174         }
 175
 176         status = sync_file(smbreq->conn, fsp, true);
 177         if (!NT_STATUS_IS_OK(status)) {
 178                 DEBUG(5,("smbd_smb2_flush: sync_file for %s returned %s\n",
 179                          fsp_str_dbg(fsp), nt_errstr(status)));
 180                 tevent_req_nterror(req, status);
 181                 return tevent_req_post(req, ev);
 182         }
 183
 184         tevent_req_done(req);
 185         return tevent_req_post(req, ev);
 186 }
 187
 188 static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req)
 189 {
 190         NTSTATUS status;
 191
 192         if (tevent_req_is_nterror(req, &status)) {
 193                 tevent_req_received(req);
 194                 return status;
 195         }
 196
 197         tevent_req_received(req);
 198         return NT_STATUS_OK;
 199 }