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         int i = req->current_idx;
  39         uint64_t in_file_id_persistent;
  40         uint64_t in_file_id_volatile;
  41         struct files_struct *in_fsp;
  42         struct tevent_req *subreq;
  43
  44         status = smbd_smb2_request_verify_sizes(req, 0x18);
  45         if (!NT_STATUS_IS_OK(status)) {
  46                 return smbd_smb2_request_error(req, status);
  47         }
  48         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
  49
  50         in_file_id_persistent   = BVAL(inbody, 0x08);
  51         in_file_id_volatile     = BVAL(inbody, 0x10);
  52
  53         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
  54         if (in_fsp == NULL) {
  55                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  56         }
  57
  58         subreq = smbd_smb2_flush_send(req, req->sconn->smb2.event_ctx,
  59                                       req, in_fsp);
  60         if (subreq == NULL) {
  61                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  62         }
  63         tevent_req_set_callback(subreq, smbd_smb2_request_flush_done, req);
  64
  65         return smbd_smb2_request_pending_queue(req, subreq);
  66 }
  67
  68 static void smbd_smb2_request_flush_done(struct tevent_req *subreq)
  69 {
  70         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
  71                                         struct smbd_smb2_request);
  72         DATA_BLOB outbody;
  73         NTSTATUS status;
  74         NTSTATUS error; /* transport error */
  75
  76         status = smbd_smb2_flush_recv(subreq);
  77         TALLOC_FREE(subreq);
  78         if (!NT_STATUS_IS_OK(status)) {
  79                 error = smbd_smb2_request_error(req, status);
  80                 if (!NT_STATUS_IS_OK(error)) {
  81                         smbd_server_connection_terminate(req->sconn,
  82                                                          nt_errstr(error));
  83                         return;
  84                 }
  85                 return;
  86         }
  87
  88         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
  89         if (outbody.data == NULL) {
  90                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  91                 if (!NT_STATUS_IS_OK(error)) {
  92                         smbd_server_connection_terminate(req->sconn,
  93                                                          nt_errstr(error));
  94                         return;
  95                 }
  96                 return;
  97         }
  98
  99         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 100         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 101
 102         error = smbd_smb2_request_done(req, outbody, NULL);
 103         if (!NT_STATUS_IS_OK(error)) {
 104                 smbd_server_connection_terminate(req->sconn,
 105                                                  nt_errstr(error));
 106                 return;
 107         }
 108 }
 109
 110 struct smbd_smb2_flush_state {
 111         struct smbd_smb2_request *smb2req;
 112 };
 113
 114 static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
 115                                                struct tevent_context *ev,
 116                                                struct smbd_smb2_request *smb2req,
 117                                                struct files_struct *fsp)
 118 {
 119         struct tevent_req *req;
 120         struct smbd_smb2_flush_state *state;
 121         NTSTATUS status;
 122         struct smb_request *smbreq;
 123
 124         req = tevent_req_create(mem_ctx, &state,
 125                                 struct smbd_smb2_flush_state);
 126         if (req == NULL) {
 127                 return NULL;
 128         }
 129         state->smb2req = smb2req;
 130
 131         DEBUG(10,("smbd_smb2_flush: %s - fnum[%d]\n",
 132                   fsp_str_dbg(fsp), fsp->fnum));
 133
 134         smbreq = smbd_smb2_fake_smb_request(smb2req);
 135         if (tevent_req_nomem(smbreq, req)) {
 136                 return tevent_req_post(req, ev);
 137         }
 138
 139         if (IS_IPC(smbreq->conn)) {
 140                 tevent_req_nterror(req, NT_STATUS_NOT_IMPLEMENTED);
 141                 return tevent_req_post(req, ev);
 142         }
 143
 144         if (!CHECK_WRITE(fsp)) {
 145                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 146                 return tevent_req_post(req, ev);
 147         }
 148
 149         status = sync_file(smbreq->conn, fsp, true);
 150         if (!NT_STATUS_IS_OK(status)) {
 151                 DEBUG(5,("smbd_smb2_flush: sync_file for %s returned %s\n",
 152                          fsp_str_dbg(fsp), nt_errstr(status)));
 153                 tevent_req_nterror(req, status);
 154                 return tevent_req_post(req, ev);
 155         }
 156
 157         tevent_req_done(req);
 158         return tevent_req_post(req, ev);
 159 }
 160
 161 static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req)
 162 {
 163         NTSTATUS status;
 164
 165         if (tevent_req_is_nterror(req, &status)) {
 166                 tevent_req_received(req);
 167                 return status;
 168         }
 169
 170         tevent_req_received(req);
 171         return NT_STATUS_OK;
 172 }