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 = smb1cli_req_create(mem_ctx, ev, cli->conn, 0, 0, 0, 0, 0, 0,
  51                                     0, NULL, NULL, 0, NULL, 0, NULL);
  52         if (tevent_req_nomem(subreq, req)) {
  53                 return tevent_req_post(req, ev);
  54         }
  55         smb1cli_req_set_mid(subreq, 0xffff);
  56
  57         if (!smbXcli_req_set_pending(subreq)) {
  58                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
  59                 return tevent_req_post(req, ev);
  60         }
  61         tevent_req_set_callback(subreq, cli_smb_oplock_break_waiter_done, req);
  62         return req;
  63 }
  64
  65 static void cli_smb_oplock_break_waiter_done(struct tevent_req *subreq)
  66 {
  67         struct tevent_req *req = tevent_req_callback_data(
  68                 subreq, struct tevent_req);
  69         struct cli_smb_oplock_break_waiter_state *state = tevent_req_data(
  70                 req, struct cli_smb_oplock_break_waiter_state);
  71         struct iovec *iov;
  72         uint8_t wct;
  73         uint16_t *vwv;
  74         NTSTATUS status;
  75
  76         status = smb1cli_req_recv(subreq, state,
  77                                   &iov, /* piov */
  78                                   NULL, /* phdr */
  79                                   &wct,
  80                                   &vwv,
  81                                   NULL, /* pvwv_offset */
  82                                   NULL, /* pnum_bytes */
  83                                   NULL, /* pbytes */
  84                                   NULL, /* pbytes_offset */
  85                                   NULL, /* pinbuf */
  86                                   NULL, 0); /* expected */
  87         TALLOC_FREE(subreq);
  88         if (!NT_STATUS_IS_OK(status)) {
  89                 tevent_req_nterror(req, status);
  90                 return;
  91         }
  92         if (wct < 8) {
  93                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
  94                 return;
  95         }
  96         state->fnum = SVAL(vwv+2, 0);
  97         state->level = CVAL(vwv+3, 1);
  98         tevent_req_done(req);
  99 }
 100
 101 NTSTATUS cli_smb_oplock_break_waiter_recv(struct tevent_req *req,
 102                                           uint16_t *pfnum,
 103                                           uint8_t *plevel)
 104 {
 105         struct cli_smb_oplock_break_waiter_state *state = tevent_req_data(
 106                 req, struct cli_smb_oplock_break_waiter_state);
 107         NTSTATUS status;
 108
 109         if (tevent_req_is_nterror(req, &status)) {
 110                 return status;
 111         }
 112         *pfnum = state->fnum;
 113         *plevel = state->level;
 114         return NT_STATUS_OK;
 115 }
 116
 117 /****************************************************************************
 118 send an ack for an oplock break request
 119 ****************************************************************************/
 120
 121 struct cli_oplock_ack_state {
 122         uint16_t vwv[8];
 123 };
 124
 125 static void cli_oplock_ack_done(struct tevent_req *subreq);
 126
 127 struct tevent_req *cli_oplock_ack_send(TALLOC_CTX *mem_ctx,
 128                                        struct tevent_context *ev,
 129                                        struct cli_state *cli,
 130                                        uint16_t fnum, uint8_t level)
 131 {
 132         struct tevent_req *req, *subreq;
 133         struct cli_oplock_ack_state *state;
 134
 135         req = tevent_req_create(mem_ctx, &state, struct cli_oplock_ack_state);
 136         if (req == NULL) {
 137                 return NULL;
 138         }
 139         SCVAL(state->vwv+0, 0, 0xff);
 140         SCVAL(state->vwv+0, 1, 0);
 141         SSVAL(state->vwv+1, 0, 0);
 142         SSVAL(state->vwv+2, 0, fnum);
 143         SCVAL(state->vwv+3, 0, LOCKING_ANDX_OPLOCK_RELEASE);
 144         SCVAL(state->vwv+3, 1, level);
 145         SIVAL(state->vwv+4, 0, 0); /* timeout */
 146         SSVAL(state->vwv+6, 0, 0); /* unlockcount */
 147         SSVAL(state->vwv+7, 0, 0); /* lockcount */
 148
 149         subreq = cli_smb_send(state, ev, cli, SMBlockingX, 0, 8, state->vwv,
 150                               0, NULL);
 151         if (tevent_req_nomem(subreq, req)) {
 152                 return tevent_req_post(req, ev);
 153         }
 154         tevent_req_set_callback(subreq, cli_oplock_ack_done, req);
 155         return req;
 156 }
 157
 158 static void cli_oplock_ack_done(struct tevent_req *subreq)
 159 {
 160         struct tevent_req *req = tevent_req_callback_data(
 161                 subreq, struct tevent_req);
 162         NTSTATUS status;
 163
 164         status = cli_smb_recv(subreq, NULL, NULL, 0, NULL, NULL, NULL, NULL);
 165         TALLOC_FREE(subreq);
 166         if (!NT_STATUS_IS_OK(status)) {
 167                 tevent_req_nterror(req, status);
 168                 return;
 169         }
 170         tevent_req_done(req);
 171 }
 172
 173 NTSTATUS cli_oplock_ack_recv(struct tevent_req *req)
 174 {
 175         return tevent_req_simple_recv_ntstatus(req);
 176 }
 177