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