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 struct cli_smb_oplock_break_waiter_state {
  26         uint16_t fnum;
  27         uint8_t level;
  28 };
  29
  30 static void cli_smb_oplock_break_waiter_done(struct tevent_req *subreq);
  31
  32 struct tevent_req *cli_smb_oplock_break_waiter_send(TALLOC_CTX *mem_ctx,
  33                                                     struct event_context *ev,
  34                                                     struct cli_state *cli)
  35 {
  36         struct tevent_req *req, *subreq;
  37         struct cli_smb_oplock_break_waiter_state *state;
  38
  39         req = tevent_req_create(mem_ctx, &state,
  40                                 struct cli_smb_oplock_break_waiter_state);
  41         if (req == NULL) {
  42                 return NULL;
  43         }
  44
  45         /*
  46          * Create a fake SMB request that we will never send out. This is only
  47          * used to be set into the pending queue with the right mid.
  48          */
  49         subreq = cli_smb_req_create(mem_ctx, ev, cli, 0, 0, 0, NULL, 0, NULL);
  50         if (tevent_req_nomem(subreq, req)) {
  51                 return tevent_req_post(req, ev);
  52         }
  53         cli_smb_req_set_mid(subreq, 0xffff);
  54
  55         if (!cli_smb_req_set_pending(subreq)) {
  56                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
  57                 return tevent_req_post(req, ev);
  58         }
  59         tevent_req_set_callback(subreq, cli_smb_oplock_break_waiter_done, req);
  60         return req;
  61 }
  62
  63 static void cli_smb_oplock_break_waiter_done(struct tevent_req *subreq)
  64 {
  65         struct tevent_req *req = tevent_req_callback_data(
  66                 subreq, struct tevent_req);
  67         struct cli_smb_oplock_break_waiter_state *state = tevent_req_data(
  68                 req, struct cli_smb_oplock_break_waiter_state);
  69         uint8_t wct;
  70         uint16_t *vwv;
  71         uint32_t num_bytes;
  72         uint8_t *bytes;
  73         uint8_t *inbuf;
  74         NTSTATUS status;
  75
  76         status = cli_smb_recv(subreq, state, &inbuf, 8, &wct, &vwv,
  77                               &num_bytes, &bytes);
  78         TALLOC_FREE(subreq);
  79         if (!NT_STATUS_IS_OK(status)) {
  80                 tevent_req_nterror(req, status);
  81                 return;
  82         }
  83         state->fnum = SVAL(vwv+2, 0);
  84         state->level = CVAL(vwv+3, 1);
  85         tevent_req_done(req);
  86 }
  87
  88 NTSTATUS cli_smb_oplock_break_waiter_recv(struct tevent_req *req,
  89                                           uint16_t *pfnum,
  90                                           uint8_t *plevel)
  91 {
  92         struct cli_smb_oplock_break_waiter_state *state = tevent_req_data(
  93                 req, struct cli_smb_oplock_break_waiter_state);
  94         NTSTATUS status;
  95
  96         if (tevent_req_is_nterror(req, &status)) {
  97                 return status;
  98         }
  99         *pfnum = state->fnum;
 100         *plevel = state->level;
 101         return NT_STATUS_OK;
 102 }
 103
 104 /****************************************************************************
 105 send an ack for an oplock break request
 106 ****************************************************************************/
 107
 108 struct cli_oplock_ack_state {
 109         uint16_t vwv[8];
 110 };
 111
 112 static void cli_oplock_ack_done(struct tevent_req *subreq);
 113
 114 struct tevent_req *cli_oplock_ack_send(TALLOC_CTX *mem_ctx,
 115                                        struct tevent_context *ev,
 116                                        struct cli_state *cli,
 117                                        uint16_t fnum, uint8_t level)
 118 {
 119         struct tevent_req *req, *subreq;
 120         struct cli_oplock_ack_state *state;
 121
 122         req = tevent_req_create(mem_ctx, &state, struct cli_oplock_ack_state);
 123         if (req == NULL) {
 124                 return NULL;
 125         }
 126         SCVAL(state->vwv+0, 0, 0xff);
 127         SCVAL(state->vwv+0, 1, 0);
 128         SSVAL(state->vwv+1, 0, 0);
 129         SSVAL(state->vwv+2, 0, fnum);
 130         SCVAL(state->vwv+3, 0, LOCKING_ANDX_OPLOCK_RELEASE);
 131         SCVAL(state->vwv+3, 1, level);
 132         SIVAL(state->vwv+4, 0, 0); /* timeout */
 133         SSVAL(state->vwv+6, 0, 0); /* unlockcount */
 134         SSVAL(state->vwv+7, 0, 0); /* lockcount */
 135
 136         subreq = cli_smb_send(state, ev, cli, SMBlockingX, 0, 8, state->vwv,
 137                               0, NULL);
 138         if (tevent_req_nomem(subreq, req)) {
 139                 return tevent_req_post(req, ev);
 140         }
 141         tevent_req_set_callback(subreq, cli_oplock_ack_done, req);
 142         return req;
 143 }
 144
 145 static void cli_oplock_ack_done(struct tevent_req *subreq)
 146 {
 147         struct tevent_req *req = tevent_req_callback_data(
 148                 subreq, struct tevent_req);
 149         NTSTATUS status;
 150
 151         status = cli_smb_recv(subreq, NULL, NULL, 0, NULL, NULL, NULL, NULL);
 152         TALLOC_FREE(subreq);
 153         if (!NT_STATUS_IS_OK(status)) {
 154                 tevent_req_nterror(req, status);
 155                 return;
 156         }
 157         tevent_req_done(req);
 158 }
 159
 160 NTSTATUS cli_oplock_ack_recv(struct tevent_req *req)
 161 {
 162         return tevent_req_simple_recv_ntstatus(req);
 163 }
 164