source3/libsmb/clioplock.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB client oplock functions
   4    Copyright (C) Andrew Tridgell 2001
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "../lib/util/tevent_ntstatus.h"
  22 #include "async_smb.h"
  23 #include "libsmb/libsmb.h"
  24
  25 /****************************************************************************
  26 send an ack for an oplock break request
  27 ****************************************************************************/
  28
  29 struct cli_oplock_ack_state {
  30         uint16_t vwv[8];
  31 };
  32
  33 static void cli_oplock_ack_done(struct tevent_req *subreq);
  34
  35 struct tevent_req *cli_oplock_ack_send(TALLOC_CTX *mem_ctx,
  36                                        struct tevent_context *ev,
  37                                        struct cli_state *cli,
  38                                        uint16_t fnum, uint8_t level)
  39 {
  40         struct tevent_req *req, *subreq;
  41         struct cli_oplock_ack_state *state;
  42
  43         req = tevent_req_create(mem_ctx, &state, struct cli_oplock_ack_state);
  44         if (req == NULL) {
  45                 return NULL;
  46         }
  47         SCVAL(state->vwv+0, 0, 0xff);
  48         SCVAL(state->vwv+0, 1, 0);
  49         SSVAL(state->vwv+1, 0, 0);
  50         SSVAL(state->vwv+2, 0, fnum);
  51         SCVAL(state->vwv+3, 0, LOCKING_ANDX_OPLOCK_RELEASE);
  52         SCVAL(state->vwv+3, 1, level);
  53         SIVAL(state->vwv+4, 0, 0); /* timeout */
  54         SSVAL(state->vwv+6, 0, 0); /* unlockcount */
  55         SSVAL(state->vwv+7, 0, 0); /* lockcount */
  56
  57         subreq = cli_smb_send(state, ev, cli, SMBlockingX, 0, 8, state->vwv,
  58                               0, NULL);
  59         if (tevent_req_nomem(subreq, req)) {
  60                 return tevent_req_post(req, ev);
  61         }
  62         tevent_req_set_callback(subreq, cli_oplock_ack_done, req);
  63         return req;
  64 }
  65
  66 static void cli_oplock_ack_done(struct tevent_req *subreq)
  67 {
  68         struct tevent_req *req = tevent_req_callback_data(
  69                 subreq, struct tevent_req);
  70         NTSTATUS status;
  71
  72         status = cli_smb_recv(subreq, NULL, NULL, 0, NULL, NULL, NULL, NULL);
  73         TALLOC_FREE(subreq);
  74         if (!NT_STATUS_IS_OK(status)) {
  75                 tevent_req_nterror(req, status);
  76                 return;
  77         }
  78         tevent_req_done(req);
  79 }
  80
  81 NTSTATUS cli_oplock_ack_recv(struct tevent_req *req)
  82 {
  83         return tevent_req_simple_recv_ntstatus(req);
  84 }
  85
  86 NTSTATUS cli_oplock_ack(struct cli_state *cli, uint16_t fnum, unsigned char level)
  87 {
  88         TALLOC_CTX *frame = talloc_stackframe();
  89         struct event_context *ev;
  90         struct tevent_req *req;
  91         NTSTATUS status = NT_STATUS_OK;
  92
  93         if (cli_has_async_calls(cli)) {
  94                 /*
  95                  * Can't use sync call while an async call is in flight
  96                  */
  97                 status = NT_STATUS_INVALID_PARAMETER;
  98                 goto fail;
  99         }
 100
 101         ev = event_context_init(frame);
 102         if (ev == NULL) {
 103                 status = NT_STATUS_NO_MEMORY;
 104                 goto fail;
 105         }
 106
 107         req = cli_oplock_ack_send(frame, ev, cli, fnum, level);
 108         if (req == NULL) {
 109                 status = NT_STATUS_NO_MEMORY;
 110                 goto fail;
 111         }
 112
 113         if (!tevent_req_poll(req, ev)) {
 114                 status = map_nt_error_from_unix(errno);
 115                 goto fail;
 116         }
 117
 118         status = cli_oplock_ack_recv(req);
 119  fail:
 120         TALLOC_FREE(frame);
 121         return status;
 122 }
 123
 124 /****************************************************************************
 125 set the oplock handler for a connection
 126 ****************************************************************************/
 127
 128 void cli_oplock_handler(struct cli_state *cli,
 129                         NTSTATUS (*handler)(struct cli_state *, uint16_t, unsigned char))
 130 {
 131         cli->oplock_handler = handler;
 132 }