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 tevent_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_oom(req);
  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 (tevent_req_nterror(req, status)) {
  89                 return;
  90         }
  91         if (wct < 8) {
  92                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
  93                 return;
  94         }
  95         state->fnum = SVAL(vwv+2, 0);
  96         state->level = CVAL(vwv+3, 1);
  97         tevent_req_done(req);
  98 }
  99
 100 NTSTATUS cli_smb_oplock_break_waiter_recv(struct tevent_req *req,
 101                                           uint16_t *pfnum,
 102                                           uint8_t *plevel)
 103 {
 104         struct cli_smb_oplock_break_waiter_state *state = tevent_req_data(
 105                 req, struct cli_smb_oplock_break_waiter_state);
 106         NTSTATUS status;
 107
 108         if (tevent_req_is_nterror(req, &status)) {
 109                 return status;
 110         }
 111         *pfnum = state->fnum;
 112         *plevel = state->level;
 113         return NT_STATUS_OK;
 114 }
 115
 116 /****************************************************************************
 117 send an ack for an oplock break request
 118 ****************************************************************************/
 119
 120 struct cli_oplock_ack_state {
 121         uint8_t dummy;
 122 };
 123
 124 static void cli_oplock_ack_done(struct tevent_req *subreq);
 125
 126 struct tevent_req *cli_oplock_ack_send(TALLOC_CTX *mem_ctx,
 127                                        struct tevent_context *ev,
 128                                        struct cli_state *cli,
 129                                        uint16_t fnum, uint8_t level)
 130 {
 131         struct tevent_req *req, *subreq;
 132         struct cli_oplock_ack_state *state;
 133
 134         req = tevent_req_create(mem_ctx, &state, struct cli_oplock_ack_state);
 135         if (req == NULL) {
 136                 return NULL;
 137         }
 138
 139         subreq = cli_lockingx_send(
 140                 state,                          /* mem_ctx */
 141                 ev,                             /* tevent_context */
 142                 cli,                            /* cli */
 143                 fnum,                           /* fnum */
 144                 LOCKING_ANDX_OPLOCK_RELEASE,    /* typeoflock */
 145                 level,                          /* newoplocklevel */
 146                 0,                              /* timeout */
 147                 0,                              /* num_unlocks */
 148                 NULL,                           /* unlocks */
 149                 0,                              /* num_locks */
 150                 NULL);                          /* locks */
 151
 152         if (tevent_req_nomem(subreq, req)) {
 153                 return tevent_req_post(req, ev);
 154         }
 155         tevent_req_set_callback(subreq, cli_oplock_ack_done, req);
 156         return req;
 157 }
 158
 159 static void cli_oplock_ack_done(struct tevent_req *subreq)
 160 {
 161         NTSTATUS status = cli_lockingx_recv(subreq);
 162         tevent_req_simple_finish_ntstatus(subreq, status);
 163 }
 164
 165 NTSTATUS cli_oplock_ack_recv(struct tevent_req *req)
 166 {
 167         return tevent_req_simple_recv_ntstatus(req);
 168 }
 169