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 #include "../libcli/smb/smbXcli_base.h"
  25
  26 struct cli_smb_oplock_break_waiter_state {
  27         uint16_t fnum;
  28         uint8_t level;
  29 };
  30
  31 static void cli_smb_oplock_break_waiter_done(struct tevent_req *subreq);
  32
  33 struct tevent_req *cli_smb_oplock_break_waiter_send(TALLOC_CTX *mem_ctx,
  34                                                     struct event_context *ev,
  35                                                     struct cli_state *cli)
  36 {
  37         struct tevent_req *req, *subreq;
  38         struct cli_smb_oplock_break_waiter_state *state;
  39
  40         req = tevent_req_create(mem_ctx, &state,
  41                                 struct cli_smb_oplock_break_waiter_state);
  42         if (req == NULL) {
  43                 return NULL;
  44         }
  45
  46         /*
  47          * Create a fake SMB request that we will never send out. This is only
  48          * used to be set into the pending queue with the right mid.
  49          */
  50         subreq = cli_smb_req_create(mem_ctx, ev, cli, 0, 0, 0, NULL, 0, NULL);
  51         if (tevent_req_nomem(subreq, req)) {
  52                 return tevent_req_post(req, ev);
  53         }
  54         cli_smb_req_set_mid(subreq, 0xffff);
  55
  56         if (!smbXcli_req_set_pending(subreq)) {
  57                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
  58                 return tevent_req_post(req, ev);
  59         }
  60         tevent_req_set_callback(subreq, cli_smb_oplock_break_waiter_done, req);
  61         return req;
  62 }
  63
  64 static void cli_smb_oplock_break_waiter_done(struct tevent_req *subreq)
  65 {
  66         struct tevent_req *req = tevent_req_callback_data(
  67                 subreq, struct tevent_req);
  68         struct cli_smb_oplock_break_waiter_state *state = tevent_req_data(
  69                 req, struct cli_smb_oplock_break_waiter_state);
  70         uint8_t wct;
  71         uint16_t *vwv;
  72         uint32_t num_bytes;
  73         uint8_t *bytes;
  74         uint8_t *inbuf;
  75         NTSTATUS status;
  76
  77         status = cli_smb_recv(subreq, state, &inbuf, 8, &wct, &vwv,
  78                               &num_bytes, &bytes);
  79         TALLOC_FREE(subreq);
  80         if (!NT_STATUS_IS_OK(status)) {
  81                 tevent_req_nterror(req, status);
  82                 return;
  83         }
  84         state->fnum = SVAL(vwv+2, 0);
  85         state->level = CVAL(vwv+3, 1);
  86         tevent_req_done(req);
  87 }
  88
  89 NTSTATUS cli_smb_oplock_break_waiter_recv(struct tevent_req *req,
  90                                           uint16_t *pfnum,
  91                                           uint8_t *plevel)
  92 {
  93         struct cli_smb_oplock_break_waiter_state *state = tevent_req_data(
  94                 req, struct cli_smb_oplock_break_waiter_state);
  95         NTSTATUS status;
  96
  97         if (tevent_req_is_nterror(req, &status)) {
  98                 return status;
  99         }
 100         *pfnum = state->fnum;
 101         *plevel = state->level;
 102         return NT_STATUS_OK;
 103 }
 104
 105 /****************************************************************************
 106 send an ack for an oplock break request
 107 ****************************************************************************/
 108
 109 struct cli_oplock_ack_state {
 110         uint16_t vwv[8];
 111 };
 112
 113 static void cli_oplock_ack_done(struct tevent_req *subreq);
 114
 115 struct tevent_req *cli_oplock_ack_send(TALLOC_CTX *mem_ctx,
 116                                        struct tevent_context *ev,
 117                                        struct cli_state *cli,
 118                                        uint16_t fnum, uint8_t level)
 119 {
 120         struct tevent_req *req, *subreq;
 121         struct cli_oplock_ack_state *state;
 122
 123         req = tevent_req_create(mem_ctx, &state, struct cli_oplock_ack_state);
 124         if (req == NULL) {
 125                 return NULL;
 126         }
 127         SCVAL(state->vwv+0, 0, 0xff);
 128         SCVAL(state->vwv+0, 1, 0);
 129         SSVAL(state->vwv+1, 0, 0);
 130         SSVAL(state->vwv+2, 0, fnum);
 131         SCVAL(state->vwv+3, 0, LOCKING_ANDX_OPLOCK_RELEASE);
 132         SCVAL(state->vwv+3, 1, level);
 133         SIVAL(state->vwv+4, 0, 0); /* timeout */
 134         SSVAL(state->vwv+6, 0, 0); /* unlockcount */
 135         SSVAL(state->vwv+7, 0, 0); /* lockcount */
 136
 137         subreq = cli_smb_send(state, ev, cli, SMBlockingX, 0, 8, state->vwv,
 138                               0, NULL);
 139         if (tevent_req_nomem(subreq, req)) {
 140                 return tevent_req_post(req, ev);
 141         }
 142         tevent_req_set_callback(subreq, cli_oplock_ack_done, req);
 143         return req;
 144 }
 145
 146 static void cli_oplock_ack_done(struct tevent_req *subreq)
 147 {
 148         struct tevent_req *req = tevent_req_callback_data(
 149                 subreq, struct tevent_req);
 150         NTSTATUS status;
 151
 152         status = cli_smb_recv(subreq, NULL, NULL, 0, NULL, NULL, NULL, NULL);
 153         TALLOC_FREE(subreq);
 154         if (!NT_STATUS_IS_OK(status)) {
 155                 tevent_req_nterror(req, status);
 156                 return;
 157         }
 158         tevent_req_done(req);
 159 }
 160
 161 NTSTATUS cli_oplock_ack_recv(struct tevent_req *req)
 162 {
 163         return tevent_req_simple_recv_ntstatus(req);
 164 }
 165