libcli/smb/smb2cli_notify.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    smb2 lib
   4    Copyright (C) Volker Lendecke 2017
   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 "system/network.h"
  22 #include "lib/util/tevent_ntstatus.h"
  23 #include "smb_common.h"
  24 #include "smbXcli_base.h"
  25 #include "librpc/gen_ndr/ndr_notify.h"
  26
  27 struct smb2cli_notify_state {
  28         uint8_t fixed[32];
  29
  30         struct iovec *recv_iov;
  31         uint8_t *data;
  32         uint32_t data_length;
  33
  34         struct tevent_req *subreq;
  35         struct tevent_req *timeout_subreq;
  36 };
  37
  38 static void smb2cli_notify_done(struct tevent_req *subreq);
  39 static void smb2cli_notify_timedout(struct tevent_req *subreq);
  40 static bool smb2cli_notify_cancel(struct tevent_req *req);
  41
  42 struct tevent_req *smb2cli_notify_send(TALLOC_CTX *mem_ctx,
  43                                        struct tevent_context *ev,
  44                                        struct smbXcli_conn *conn,
  45                                        uint32_t timeout_msec,
  46                                        struct smbXcli_session *session,
  47                                        struct smbXcli_tcon *tcon,
  48                                        uint32_t output_buffer_length,
  49                                        uint64_t fid_persistent,
  50                                        uint64_t fid_volatile,
  51                                        uint32_t completion_filter,
  52                                        bool recursive)
  53 {
  54         struct tevent_req *req;
  55         struct smb2cli_notify_state *state;
  56         uint8_t *fixed;
  57         uint16_t watch_tree;
  58
  59         req = tevent_req_create(mem_ctx, &state,
  60                                 struct smb2cli_notify_state);
  61         if (req == NULL) {
  62                 return NULL;
  63         }
  64
  65         watch_tree = recursive ? SMB2_WATCH_TREE : 0;
  66         fixed = state->fixed;
  67         SSVAL(fixed, 0, 32);
  68         SSVAL(fixed, 2, watch_tree);
  69         SIVAL(fixed, 4, output_buffer_length);
  70         SBVAL(fixed, 8, fid_persistent);
  71         SBVAL(fixed, 16, fid_volatile);
  72         SIVAL(fixed, 24, completion_filter);
  73         SIVAL(fixed, 28, 0);    /* reserved */
  74
  75         state->subreq = smb2cli_req_send(state, ev, conn, SMB2_OP_NOTIFY,
  76                                          0, 0, /* flags */
  77                                          0,     /* timeout_msec */
  78                                          tcon,
  79                                          session,
  80                                          state->fixed, sizeof(state->fixed),
  81                                          NULL, 0, /* dyn* */
  82                                          0); /* max_dyn_len */
  83         if (tevent_req_nomem(state->subreq, req)) {
  84                 return tevent_req_post(req, ev);
  85         }
  86         tevent_req_set_callback(state->subreq, smb2cli_notify_done, req);
  87
  88         if (timeout_msec != 0) {
  89                 state->timeout_subreq = tevent_wakeup_send(
  90                         state, ev, timeval_current_ofs_msec(timeout_msec));
  91                 if (tevent_req_nomem(state->timeout_subreq, req)) {
  92                         return tevent_req_post(req, ev);
  93                 }
  94                 tevent_req_set_callback(
  95                         state->timeout_subreq, smb2cli_notify_timedout, req);
  96         }
  97
  98         tevent_req_set_cancel_fn(req, smb2cli_notify_cancel);
  99
 100         return req;
 101 }
 102
 103 static bool smb2cli_notify_cancel(struct tevent_req *req)
 104 {
 105         struct smb2cli_notify_state *state = tevent_req_data(
 106                 req, struct smb2cli_notify_state);
 107         bool ok;
 108
 109         TALLOC_FREE(state->timeout_subreq);
 110
 111         ok = tevent_req_cancel(state->subreq);
 112         return ok;
 113 }
 114
 115 static void smb2cli_notify_timedout(struct tevent_req *subreq)
 116 {
 117         struct tevent_req *req = tevent_req_callback_data(
 118                 subreq, struct tevent_req);
 119         struct smb2cli_notify_state *state = tevent_req_data(
 120                 req, struct smb2cli_notify_state);
 121         bool ok;
 122
 123         ok = tevent_wakeup_recv(subreq);
 124         if (!ok) {
 125                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 126                 return;
 127         }
 128
 129         ok = tevent_req_cancel(state->subreq);
 130         if (!ok) {
 131                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 132                 return;
 133         }
 134 }
 135
 136 static void smb2cli_notify_done(struct tevent_req *subreq)
 137 {
 138         struct tevent_req *req = tevent_req_callback_data(
 139                 subreq, struct tevent_req);
 140         struct smb2cli_notify_state *state = tevent_req_data(
 141                 req, struct smb2cli_notify_state);
 142         NTSTATUS status;
 143         struct iovec *iov;
 144         uint16_t data_offset;
 145         static const struct smb2cli_req_expected_response expected[] = {
 146         {
 147                 .status = NT_STATUS_OK,
 148                 .body_size = 0x09
 149         }
 150         };
 151
 152         status = smb2cli_req_recv(subreq, state, &iov,
 153                                   expected, ARRAY_SIZE(expected));
 154         TALLOC_FREE(subreq);
 155
 156         if (NT_STATUS_EQUAL(status, NT_STATUS_CANCELLED)) {
 157                 status = NT_STATUS_IO_TIMEOUT;
 158         }
 159         if (tevent_req_nterror(req, status)) {
 160                 return;
 161         }
 162
 163         data_offset = SVAL(iov[1].iov_base, 2);
 164         state->data_length = IVAL(iov[1].iov_base, 4);
 165
 166         if ((data_offset != SMB2_HDR_BODY + 8) ||
 167             (state->data_length > iov[2].iov_len)) {
 168                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 169                 return;
 170         }
 171
 172         state->recv_iov = iov;
 173         state->data = (uint8_t *)iov[2].iov_base;
 174         tevent_req_done(req);
 175 }
 176
 177 NTSTATUS smb2cli_notify_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 178                              uint8_t **data, uint32_t *data_length)
 179 {
 180         struct smb2cli_notify_state *state = tevent_req_data(
 181                 req, struct smb2cli_notify_state);
 182         NTSTATUS status;
 183
 184         if (tevent_req_is_nterror(req, &status)) {
 185                 return status;
 186         }
 187         talloc_steal(mem_ctx, state->recv_iov);
 188         *data_length = state->data_length;
 189         *data = state->data;
 190         return NT_STATUS_OK;
 191 }
 192
 193 NTSTATUS smb2cli_notify(struct smbXcli_conn *conn,
 194                         uint32_t timeout_msec,
 195                         struct smbXcli_session *session,
 196                         struct smbXcli_tcon *tcon,
 197                         uint32_t output_buffer_length,
 198                         uint64_t fid_persistent,
 199                         uint64_t fid_volatile,
 200                         uint32_t completion_filter,
 201                         bool recursive,
 202                         TALLOC_CTX *mem_ctx,
 203                         uint8_t **data,
 204                         uint32_t *data_length)
 205 {
 206         TALLOC_CTX *frame = talloc_stackframe();
 207         struct tevent_context *ev;
 208         struct tevent_req *req;
 209         NTSTATUS status = NT_STATUS_NO_MEMORY;
 210
 211         if (smbXcli_conn_has_async_calls(conn)) {
 212                 /*
 213                  * Can't use sync call while an async call is in flight
 214                  */
 215                 status = NT_STATUS_INVALID_PARAMETER;
 216                 goto fail;
 217         }
 218         ev = samba_tevent_context_init(frame);
 219         if (ev == NULL) {
 220                 goto fail;
 221         }
 222         req = smb2cli_notify_send(frame, ev, conn, timeout_msec,
 223                                   session, tcon, output_buffer_length,
 224                                   fid_persistent, fid_volatile,
 225                                   completion_filter, recursive);
 226         if (req == NULL) {
 227                 goto fail;
 228         }
 229         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 230                 goto fail;
 231         }
 232         status = smb2cli_notify_recv(req, mem_ctx, data, data_length);
 233  fail:
 234         TALLOC_FREE(frame);
 235         return status;
 236 }