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 "async_smb.h"
  22
  23 /****************************************************************************
  24 send an ack for an oplock break request
  25 ****************************************************************************/
  26
  27 struct cli_oplock_ack_state {
  28         uint16_t vwv[8];
  29 };
  30
  31 static void cli_oplock_ack_done(struct tevent_req *subreq);
  32
  33 struct tevent_req *cli_oplock_ack_send(TALLOC_CTX *mem_ctx,
  34                                        struct tevent_context *ev,
  35                                        struct cli_state *cli,
  36                                        uint16_t fnum, uint8_t level)
  37 {
  38         struct tevent_req *req, *subreq;
  39         struct cli_oplock_ack_state *state;
  40
  41         req = tevent_req_create(mem_ctx, &state, struct cli_oplock_ack_state);
  42         if (req == NULL) {
  43                 return NULL;
  44         }
  45         SCVAL(state->vwv+0, 0, 0xff);
  46         SCVAL(state->vwv+0, 1, 0);
  47         SSVAL(state->vwv+1, 0, 0);
  48         SSVAL(state->vwv+2, 0, fnum);
  49         SCVAL(state->vwv+3, 0, LOCKING_ANDX_OPLOCK_RELEASE);
  50         SCVAL(state->vwv+3, 1, level);
  51         SIVAL(state->vwv+4, 0, 0); /* timeout */
  52         SSVAL(state->vwv+6, 0, 0); /* unlockcount */
  53         SSVAL(state->vwv+7, 0, 0); /* lockcount */
  54
  55         subreq = cli_smb_send(state, ev, cli, SMBlockingX, 0, 8, state->vwv,
  56                               0, NULL);
  57         if (tevent_req_nomem(subreq, req)) {
  58                 return tevent_req_post(req, ev);
  59         }
  60         tevent_req_set_callback(subreq, cli_oplock_ack_done, req);
  61         return req;
  62 }
  63
  64 static void cli_oplock_ack_done(struct tevent_req *subreq)
  65 {
  66         struct tevent_req *req = tevent_req_callback_data(
  67                 subreq, struct tevent_req);
  68         NTSTATUS status;
  69
  70         status = cli_smb_recv(subreq, NULL, NULL, 0, NULL, NULL, NULL, NULL);
  71         TALLOC_FREE(subreq);
  72         if (!NT_STATUS_IS_OK(status)) {
  73                 tevent_req_nterror(req, status);
  74                 return;
  75         }
  76         tevent_req_done(req);
  77 }
  78
  79 NTSTATUS cli_oplock_ack_recv(struct tevent_req *req)
  80 {
  81         return tevent_req_simple_recv_ntstatus(req);
  82 }
  83
  84 NTSTATUS cli_oplock_ack(struct cli_state *cli, uint16_t fnum, unsigned char level)
  85 {
  86         TALLOC_CTX *frame = talloc_stackframe();
  87         struct event_context *ev;
  88         struct tevent_req *req;
  89         NTSTATUS status = NT_STATUS_OK;
  90
  91         if (cli_has_async_calls(cli)) {
  92                 /*
  93                  * Can't use sync call while an async call is in flight
  94                  */
  95                 status = NT_STATUS_INVALID_PARAMETER;
  96                 goto fail;
  97         }
  98
  99         ev = event_context_init(frame);
 100         if (ev == NULL) {
 101                 status = NT_STATUS_NO_MEMORY;
 102                 goto fail;
 103         }
 104
 105         req = cli_oplock_ack_send(frame, ev, cli, fnum, level);
 106         if (req == NULL) {
 107                 status = NT_STATUS_NO_MEMORY;
 108                 goto fail;
 109         }
 110
 111         if (!tevent_req_poll(req, ev)) {
 112                 status = map_nt_error_from_unix(errno);
 113                 goto fail;
 114         }
 115
 116         status = cli_oplock_ack_recv(req);
 117  fail:
 118         TALLOC_FREE(frame);
 119         if (!NT_STATUS_IS_OK(status)) {
 120                 cli_set_error(cli, status);
 121         }
 122         return status;
 123 }
 124
 125 /****************************************************************************
 126 set the oplock handler for a connection
 127 ****************************************************************************/
 128
 129 void cli_oplock_handler(struct cli_state *cli,
 130                         NTSTATUS (*handler)(struct cli_state *, uint16_t, unsigned char))
 131 {
 132         cli->oplock_handler = handler;
 133 }