s3-tevent: only include ../lib/util/tevent wrappers where needed.
[bbaumbach/samba-autobuild/.git] / source3 / smbd / smb2_notify.c
1 /*
2    Unix SMB/CIFS implementation.
3    Core SMB2 server
4
5    Copyright (C) Stefan Metzmacher 2009
6    Copyright (C) Jeremy Allison 2010
7
8    This program is free software; you can redistribute it and/or modify
9    it under the terms of the GNU General Public License as published by
10    the Free Software Foundation; either version 3 of the License, or
11    (at your option) any later version.
12
13    This program is distributed in the hope that it will be useful,
14    but WITHOUT ANY WARRANTY; without even the implied warranty of
15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16    GNU General Public License for more details.
17
18    You should have received a copy of the GNU General Public License
19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "smbd/smbd.h"
24 #include "smbd/globals.h"
25 #include "../libcli/smb/smb_common.h"
26 #include "../lib/util/tevent_ntstatus.h"
27
28 struct smbd_smb2_notify_state {
29         struct smbd_smb2_request *smb2req;
30         struct smb_request *smbreq;
31         struct tevent_immediate *im;
32         NTSTATUS status;
33         DATA_BLOB out_output_buffer;
34 };
35
36 static struct tevent_req *smbd_smb2_notify_send(TALLOC_CTX *mem_ctx,
37                                                 struct tevent_context *ev,
38                                                 struct smbd_smb2_request *smb2req,
39                                                 uint16_t in_flags,
40                                                 uint32_t in_output_buffer_length,
41                                                 uint64_t in_file_id_volatile,
42                                                 uint64_t in_completion_filter);
43 static NTSTATUS smbd_smb2_notify_recv(struct tevent_req *req,
44                                       TALLOC_CTX *mem_ctx,
45                                       DATA_BLOB *out_output_buffer);
46
47 static void smbd_smb2_request_notify_done(struct tevent_req *subreq);
48 NTSTATUS smbd_smb2_request_process_notify(struct smbd_smb2_request *req)
49 {
50         const uint8_t *inhdr;
51         const uint8_t *inbody;
52         int i = req->current_idx;
53         size_t expected_body_size = 0x20;
54         size_t body_size;
55         uint16_t in_flags;
56         uint32_t in_output_buffer_length;
57         uint64_t in_file_id_persistent;
58         uint64_t in_file_id_volatile;
59         uint64_t in_completion_filter;
60         struct tevent_req *subreq;
61
62         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
63         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
64                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
65         }
66
67         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
68
69         body_size = SVAL(inbody, 0x00);
70         if (body_size != expected_body_size) {
71                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
72         }
73
74         in_flags                = SVAL(inbody, 0x02);
75         in_output_buffer_length = IVAL(inbody, 0x04);
76         in_file_id_persistent   = BVAL(inbody, 0x08);
77         in_file_id_volatile     = BVAL(inbody, 0x10);
78         in_completion_filter    = IVAL(inbody, 0x18);
79
80         /*
81          * 0x00010000 is what Windows 7 uses,
82          * Windows 2008 uses 0x00080000
83          */
84         if (in_output_buffer_length > lp_smb2_max_trans()) {
85                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
86         }
87
88         if (req->compat_chain_fsp) {
89                 /* skip check */
90         } else if (in_file_id_persistent != in_file_id_volatile) {
91                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
92         }
93
94         subreq = smbd_smb2_notify_send(req,
95                                        req->sconn->smb2.event_ctx,
96                                        req,
97                                        in_flags,
98                                        in_output_buffer_length,
99                                        in_file_id_volatile,
100                                        in_completion_filter);
101         if (subreq == NULL) {
102                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
103         }
104         tevent_req_set_callback(subreq, smbd_smb2_request_notify_done, req);
105
106         return smbd_smb2_request_pending_queue(req, subreq);
107 }
108
109 static void smbd_smb2_request_notify_done(struct tevent_req *subreq)
110 {
111         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
112                                         struct smbd_smb2_request);
113         int i = req->current_idx;
114         uint8_t *outhdr;
115         DATA_BLOB outbody;
116         DATA_BLOB outdyn;
117         uint16_t out_output_buffer_offset;
118         DATA_BLOB out_output_buffer = data_blob_null;
119         NTSTATUS status;
120         NTSTATUS error; /* transport error */
121
122         if (req->cancelled) {
123                 struct smbd_smb2_notify_state *state = tevent_req_data(subreq,
124                                                struct smbd_smb2_notify_state);
125                 const uint8_t *inhdr = (const uint8_t *)req->in.vector[i].iov_base;
126                 uint64_t mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
127
128                 DEBUG(10,("smbd_smb2_request_notify_done: cancelled mid %llu\n",
129                         (unsigned long long)mid ));
130                 error = smbd_smb2_request_error(req, NT_STATUS_CANCELLED);
131                 if (!NT_STATUS_IS_OK(error)) {
132                         smbd_server_connection_terminate(req->sconn,
133                                 nt_errstr(error));
134                         return;
135                 }
136                 TALLOC_FREE(state->im);
137                 return;
138         }
139
140         status = smbd_smb2_notify_recv(subreq,
141                                        req,
142                                        &out_output_buffer);
143         TALLOC_FREE(subreq);
144         if (!NT_STATUS_IS_OK(status)) {
145                 error = smbd_smb2_request_error(req, status);
146                 if (!NT_STATUS_IS_OK(error)) {
147                         smbd_server_connection_terminate(req->sconn,
148                                                          nt_errstr(error));
149                         return;
150                 }
151                 return;
152         }
153
154         out_output_buffer_offset = SMB2_HDR_BODY + 0x08;
155
156         outhdr = (uint8_t *)req->out.vector[i].iov_base;
157
158         outbody = data_blob_talloc(req->out.vector, NULL, 0x08);
159         if (outbody.data == NULL) {
160                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
161                 if (!NT_STATUS_IS_OK(error)) {
162                         smbd_server_connection_terminate(req->sconn,
163                                                          nt_errstr(error));
164                         return;
165                 }
166                 return;
167         }
168
169         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
170         SSVAL(outbody.data, 0x02,
171               out_output_buffer_offset);        /* output buffer offset */
172         SIVAL(outbody.data, 0x04,
173               out_output_buffer.length);        /* output buffer length */
174
175         outdyn = out_output_buffer;
176
177         error = smbd_smb2_request_done(req, outbody, &outdyn);
178         if (!NT_STATUS_IS_OK(error)) {
179                 smbd_server_connection_terminate(req->sconn,
180                                                  nt_errstr(error));
181                 return;
182         }
183 }
184
185 static void smbd_smb2_notify_reply(struct smb_request *smbreq,
186                                    NTSTATUS error_code,
187                                    uint8_t *buf, size_t len);
188 static void smbd_smb2_notify_reply_trigger(struct tevent_context *ctx,
189                                            struct tevent_immediate *im,
190                                            void *private_data);
191 static bool smbd_smb2_notify_cancel(struct tevent_req *req);
192
193 static struct tevent_req *smbd_smb2_notify_send(TALLOC_CTX *mem_ctx,
194                                                 struct tevent_context *ev,
195                                                 struct smbd_smb2_request *smb2req,
196                                                 uint16_t in_flags,
197                                                 uint32_t in_output_buffer_length,
198                                                 uint64_t in_file_id_volatile,
199                                                 uint64_t in_completion_filter)
200 {
201         struct tevent_req *req;
202         struct smbd_smb2_notify_state *state;
203         struct smb_request *smbreq;
204         connection_struct *conn = smb2req->tcon->compat_conn;
205         files_struct *fsp;
206         bool recursive = (in_flags & 0x0001) ? true : false;
207         NTSTATUS status;
208
209         req = tevent_req_create(mem_ctx, &state,
210                                 struct smbd_smb2_notify_state);
211         if (req == NULL) {
212                 return NULL;
213         }
214         state->smb2req = smb2req;
215         state->status = NT_STATUS_INTERNAL_ERROR;
216         state->out_output_buffer = data_blob_null;
217         state->im = NULL;
218
219         DEBUG(10,("smbd_smb2_notify_send: file_id[0x%016llX]\n",
220                   (unsigned long long)in_file_id_volatile));
221
222         smbreq = smbd_smb2_fake_smb_request(smb2req);
223         if (tevent_req_nomem(smbreq, req)) {
224                 return tevent_req_post(req, ev);
225         }
226
227         state->smbreq = smbreq;
228         smbreq->async_priv = (void *)req;
229
230         fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
231         if (fsp == NULL) {
232                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
233                 return tevent_req_post(req, ev);
234         }
235         if (conn != fsp->conn) {
236                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
237                 return tevent_req_post(req, ev);
238         }
239         if (smb2req->session->vuid != fsp->vuid) {
240                 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
241                 return tevent_req_post(req, ev);
242         }
243
244         {
245                 char *filter_string;
246
247                 filter_string = notify_filter_string(NULL, in_completion_filter);
248                 if (tevent_req_nomem(filter_string, req)) {
249                         return tevent_req_post(req, ev);
250                 }
251
252                 DEBUG(3,("smbd_smb2_notify_send: notify change "
253                          "called on %s, filter = %s, recursive = %d\n",
254                          fsp_str_dbg(fsp), filter_string, recursive));
255
256                 TALLOC_FREE(filter_string);
257         }
258
259         if ((!fsp->is_directory) || (conn != fsp->conn)) {
260                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
261                 return tevent_req_post(req, ev);
262         }
263
264         if (fsp->notify == NULL) {
265
266                 status = change_notify_create(fsp,
267                                               in_completion_filter,
268                                               recursive);
269                 if (!NT_STATUS_IS_OK(status)) {
270                         DEBUG(10, ("change_notify_create returned %s\n",
271                                    nt_errstr(status)));
272                         tevent_req_nterror(req, status);
273                         return tevent_req_post(req, ev);
274                 }
275         }
276
277         if (fsp->notify->num_changes != 0) {
278
279                 /*
280                  * We've got changes pending, respond immediately
281                  */
282
283                 /*
284                  * TODO: write a torture test to check the filtering behaviour
285                  * here.
286                  */
287
288                 change_notify_reply(smbreq,
289                                     NT_STATUS_OK,
290                                     in_output_buffer_length,
291                                     fsp->notify,
292                                     smbd_smb2_notify_reply);
293
294                 /*
295                  * change_notify_reply() above has independently
296                  * called tevent_req_done().
297                  */
298                 return tevent_req_post(req, ev);
299         }
300
301         state->im = tevent_create_immediate(state);
302         if (tevent_req_nomem(state->im, req)) {
303                 return tevent_req_post(req, ev);
304         }
305
306         /*
307          * No changes pending, queue the request
308          */
309
310         status = change_notify_add_request(smbreq,
311                         in_output_buffer_length,
312                         in_completion_filter,
313                         recursive, fsp,
314                         smbd_smb2_notify_reply);
315         if (!NT_STATUS_IS_OK(status)) {
316                 tevent_req_nterror(req, status);
317                 return tevent_req_post(req, ev);
318         }
319
320         /* allow this request to be canceled */
321         tevent_req_set_cancel_fn(req, smbd_smb2_notify_cancel);
322
323         return req;
324 }
325
326 static void smbd_smb2_notify_reply(struct smb_request *smbreq,
327                                    NTSTATUS error_code,
328                                    uint8_t *buf, size_t len)
329 {
330         struct tevent_req *req = talloc_get_type_abort(smbreq->async_priv,
331                                                        struct tevent_req);
332         struct smbd_smb2_notify_state *state = tevent_req_data(req,
333                                                struct smbd_smb2_notify_state);
334
335         state->status = error_code;
336         if (!NT_STATUS_IS_OK(error_code)) {
337                 /* nothing */
338         } else if (len == 0) {
339                 state->status = STATUS_NOTIFY_ENUM_DIR;
340         } else {
341                 state->out_output_buffer = data_blob_talloc(state, buf, len);
342                 if (state->out_output_buffer.data == NULL) {
343                         state->status = NT_STATUS_NO_MEMORY;
344                 }
345         }
346
347         if (state->im == NULL) {
348                 smbd_smb2_notify_reply_trigger(NULL, NULL, req);
349                 return;
350         }
351
352         /*
353          * if this is called async, we need to go via an immediate event
354          * because the caller replies on the smb_request (a child of req
355          * being arround after calling this function
356          */
357         tevent_schedule_immediate(state->im,
358                                   state->smb2req->sconn->smb2.event_ctx,
359                                   smbd_smb2_notify_reply_trigger,
360                                   req);
361 }
362
363 static void smbd_smb2_notify_reply_trigger(struct tevent_context *ctx,
364                                            struct tevent_immediate *im,
365                                            void *private_data)
366 {
367         struct tevent_req *req = talloc_get_type_abort(private_data,
368                                                        struct tevent_req);
369         struct smbd_smb2_notify_state *state = tevent_req_data(req,
370                                                struct smbd_smb2_notify_state);
371
372         if (!NT_STATUS_IS_OK(state->status)) {
373                 tevent_req_nterror(req, state->status);
374                 return;
375         }
376
377         tevent_req_done(req);
378 }
379
380 static bool smbd_smb2_notify_cancel(struct tevent_req *req)
381 {
382         struct smbd_smb2_notify_state *state = tevent_req_data(req,
383                                                struct smbd_smb2_notify_state);
384
385         smbd_notify_cancel_by_smbreq(state->smbreq);
386
387         state->smb2req->cancelled = true;
388         tevent_req_done(req);
389         return true;
390 }
391
392 static NTSTATUS smbd_smb2_notify_recv(struct tevent_req *req,
393                                       TALLOC_CTX *mem_ctx,
394                                       DATA_BLOB *out_output_buffer)
395 {
396         NTSTATUS status;
397         struct smbd_smb2_notify_state *state = tevent_req_data(req,
398                                                struct smbd_smb2_notify_state);
399
400         if (tevent_req_is_nterror(req, &status)) {
401                 tevent_req_received(req);
402                 return status;
403         }
404
405         *out_output_buffer = state->out_output_buffer;
406         talloc_steal(mem_ctx, out_output_buffer->data);
407
408         tevent_req_received(req);
409         return NT_STATUS_OK;
410 }