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
  22 /****************************************************************************
  23 send an ack for an oplock break request
  24 ****************************************************************************/
  25
  26 struct cli_oplock_ack_state {
  27         uint16_t vwv[8];
  28 };
  29
  30 static void cli_oplock_ack_done(struct tevent_req *subreq);
  31
  32 struct tevent_req *cli_oplock_ack_send(TALLOC_CTX *mem_ctx,
  33                                        struct tevent_context *ev,
  34                                        struct cli_state *cli,
  35                                        uint16_t fnum, uint8_t level)
  36 {
  37         struct tevent_req *req, *subreq;
  38         struct cli_oplock_ack_state *state;
  39
  40         req = tevent_req_create(mem_ctx, &state, struct cli_oplock_ack_state);;
  41         if (req == NULL) {
  42                 return NULL;
  43         }
  44         SCVAL(state->vwv+0, 0, 0xff);
  45         SCVAL(state->vwv+0, 1, 0);
  46         SSVAL(state->vwv+1, 0, 0);
  47         SSVAL(state->vwv+2, 0, fnum);
  48         SCVAL(state->vwv+3, 0, LOCKING_ANDX_OPLOCK_RELEASE);
  49         SCVAL(state->vwv+3, 1, level);
  50         SIVAL(state->vwv+4, 0, 0); /* timeout */
  51         SSVAL(state->vwv+6, 0, 0); /* unlockcount */
  52         SSVAL(state->vwv+7, 0, 0); /* lockcount */
  53
  54         subreq = cli_smb_send(state, ev, cli, SMBlockingX, 0, 8, state->vwv,
  55                               0, NULL);
  56         if (tevent_req_nomem(subreq, req)) {
  57                 return tevent_req_post(req, ev);
  58         }
  59         tevent_req_set_callback(subreq, cli_oplock_ack_done, req);
  60         return req;
  61 }
  62
  63 static void cli_oplock_ack_done(struct tevent_req *subreq)
  64 {
  65         struct tevent_req *req = tevent_req_callback_data(
  66                 subreq, struct tevent_req);
  67         NTSTATUS status;
  68
  69         status = cli_smb_recv(subreq, NULL, NULL, 0, NULL, NULL, NULL, NULL);
  70         TALLOC_FREE(subreq);
  71         if (!NT_STATUS_IS_OK(status)) {
  72                 tevent_req_nterror(req, status);
  73                 return;
  74         }
  75         tevent_req_done(req);
  76 }
  77
  78 NTSTATUS cli_oplock_ack_recv(struct tevent_req *req)
  79 {
  80         return tevent_req_simple_recv_ntstatus(req);
  81 }
  82
  83 NTSTATUS cli_oplock_ack(struct cli_state *cli, uint16_t fnum, unsigned char level)
  84 {
  85         TALLOC_CTX *frame = talloc_stackframe();
  86         struct event_context *ev;
  87         struct tevent_req *req;
  88         NTSTATUS status = NT_STATUS_OK;
  89
  90         if (cli_has_async_calls(cli)) {
  91                 /*
  92                  * Can't use sync call while an async call is in flight
  93                  */
  94                 status = NT_STATUS_INVALID_PARAMETER;
  95                 goto fail;
  96         }
  97
  98         ev = event_context_init(frame);
  99         if (ev == NULL) {
 100                 status = NT_STATUS_NO_MEMORY;
 101                 goto fail;
 102         }
 103
 104         req = cli_oplock_ack_send(frame, ev, cli, fnum, level);
 105         if (req == NULL) {
 106                 status = NT_STATUS_NO_MEMORY;
 107                 goto fail;
 108         }
 109
 110         if (!tevent_req_poll(req, ev)) {
 111                 status = map_nt_error_from_unix(errno);
 112                 goto fail;
 113         }
 114
 115         status = cli_oplock_ack_recv(req);
 116  fail:
 117         TALLOC_FREE(frame);
 118         if (!NT_STATUS_IS_OK(status)) {
 119                 cli_set_error(cli, status);
 120         }
 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 }