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