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Fix const warnings.
[Samba/gebeck_regimport.git] / source3 / smbd / smb2_write.c
blob49a77e63a90434da1990fe23a754a0c62fce75de
1 /*
2 Unix SMB/CIFS implementation.
3 Core SMB2 server
4
5 Copyright (C) Stefan Metzmacher 2009
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "includes.h"
22 #include "smbd/smbd.h"
23 #include "smbd/globals.h"
24 #include "../libcli/smb/smb_common.h"
25 #include "../lib/util/tevent_ntstatus.h"
26 #include "rpc_server/srv_pipe_hnd.h"
27
28 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
29 struct tevent_context *ev,
30 struct smbd_smb2_request *smb2req,
31 uint32_t in_smbpid,
32 uint64_t in_file_id_volatile,
33 DATA_BLOB in_data,
34 uint64_t in_offset,
35 uint32_t in_flags);
36 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
37 uint32_t *out_count);
38
39 static void smbd_smb2_request_write_done(struct tevent_req *subreq);
40 NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req)
41 {
42 NTSTATUS status;
43 const uint8_t *inhdr;
44 const uint8_t *inbody;
45 int i = req->current_idx;
46 uint32_t in_smbpid;
47 uint16_t in_data_offset;
48 uint32_t in_data_length;
49 DATA_BLOB in_data_buffer;
50 uint64_t in_offset;
51 uint64_t in_file_id_persistent;
52 uint64_t in_file_id_volatile;
53 uint32_t in_flags;
54 struct tevent_req *subreq;
55
56 status = smbd_smb2_request_verify_sizes(req, 0x31);
57 if (!NT_STATUS_IS_OK(status)) {
58 return smbd_smb2_request_error(req, status);
59 }
60 inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
61 inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
62
63 in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
64
65 in_data_offset = SVAL(inbody, 0x02);
66 in_data_length = IVAL(inbody, 0x04);
67 in_offset = BVAL(inbody, 0x08);
68 in_file_id_persistent = BVAL(inbody, 0x10);
69 in_file_id_volatile = BVAL(inbody, 0x18);
70 in_flags = IVAL(inbody, 0x2C);
71
72 if (in_data_offset != (SMB2_HDR_BODY + req->in.vector[i+1].iov_len)) {
73 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
74 }
75
76 if (in_data_length > req->in.vector[i+2].iov_len) {
77 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
78 }
79
80 /* check the max write size */
81 if (in_data_length > req->sconn->smb2.max_write) {
82 DEBUG(2,("smbd_smb2_request_process_write : "
83 "client ignored max write :%s: 0x%08X: 0x%08X\n",
84 __location__, in_data_length, req->sconn->smb2.max_write));
85 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
86 }
87
88 in_data_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
89 in_data_buffer.length = in_data_length;
90
91 if (req->compat_chain_fsp) {
92 /* skip check */
93 } else if (in_file_id_persistent != in_file_id_volatile) {
94 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
95 }
96
97 subreq = smbd_smb2_write_send(req,
98 req->sconn->ev_ctx,
99 req,
100 in_smbpid,
101 in_file_id_volatile,
102 in_data_buffer,
103 in_offset,
104 in_flags);
105 if (subreq == NULL) {
106 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
107 }
108 tevent_req_set_callback(subreq, smbd_smb2_request_write_done, req);
109
110 return smbd_smb2_request_pending_queue(req, subreq, 500);
111 }
112
113 static void smbd_smb2_request_write_done(struct tevent_req *subreq)
114 {
115 struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
116 struct smbd_smb2_request);
117 DATA_BLOB outbody;
118 DATA_BLOB outdyn;
119 uint32_t out_count = 0;
120 NTSTATUS status;
121 NTSTATUS error; /* transport error */
122
123 status = smbd_smb2_write_recv(subreq, &out_count);
124 TALLOC_FREE(subreq);
125 if (!NT_STATUS_IS_OK(status)) {
126 error = smbd_smb2_request_error(req, status);
127 if (!NT_STATUS_IS_OK(error)) {
128 smbd_server_connection_terminate(req->sconn,
129 nt_errstr(error));
130 return;
131 }
132 return;
133 }
134
135 outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
136 if (outbody.data == NULL) {
137 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
138 if (!NT_STATUS_IS_OK(error)) {
139 smbd_server_connection_terminate(req->sconn,
140 nt_errstr(error));
141 return;
142 }
143 return;
144 }
145
146 SSVAL(outbody.data, 0x00, 0x10 + 1); /* struct size */
147 SSVAL(outbody.data, 0x02, 0); /* reserved */
148 SIVAL(outbody.data, 0x04, out_count); /* count */
149 SIVAL(outbody.data, 0x08, 0); /* remaining */
150 SSVAL(outbody.data, 0x0C, 0); /* write channel info offset */
151 SSVAL(outbody.data, 0x0E, 0); /* write channel info length */
152
153 outdyn = data_blob_const(NULL, 0);
154
155 error = smbd_smb2_request_done(req, outbody, &outdyn);
156 if (!NT_STATUS_IS_OK(error)) {
157 smbd_server_connection_terminate(req->sconn, nt_errstr(error));
158 return;
159 }
160 }
161
162 struct smbd_smb2_write_state {
163 struct smbd_smb2_request *smb2req;
164 struct smb_request *smbreq;
165 files_struct *fsp;
166 bool write_through;
167 uint32_t in_length;
168 uint64_t in_offset;
169 uint32_t out_count;
170 };
171
172 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq);
173
174 NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
175 {
176 NTSTATUS status;
177 struct smbd_smb2_write_state *state = tevent_req_data(req,
178 struct smbd_smb2_write_state);
179 files_struct *fsp = state->fsp;
180
181 DEBUG(3,("smb2: fnum=[%d/%s] "
182 "length=%lu offset=%lu wrote=%lu\n",
183 fsp->fnum,
184 fsp_str_dbg(fsp),
185 (unsigned long)state->in_length,
186 (unsigned long)state->in_offset,
187 (unsigned long)nwritten));
188
189 if (nwritten == -1) {
190 return map_nt_error_from_unix(err);
191 }
192
193 if ((nwritten == 0) && (state->in_length != 0)) {
194 DEBUG(5,("smb2: write [%s] disk full\n",
195 fsp_str_dbg(fsp)));
196 return NT_STATUS_DISK_FULL;
197 }
198
199 status = sync_file(fsp->conn, fsp, state->write_through);
200 if (!NT_STATUS_IS_OK(status)) {
201 DEBUG(5,("smb2: sync_file for %s returned %s\n",
202 fsp_str_dbg(fsp),
203 nt_errstr(status)));
204 return status;
205 }
206
207 state->out_count = nwritten;
208
209 return NT_STATUS_OK;
210 }
211
212 static bool smbd_smb2_write_cancel(struct tevent_req *req)
213 {
214 struct smbd_smb2_write_state *state =
215 tevent_req_data(req,
216 struct smbd_smb2_write_state);
217
218 state->smb2req->cancelled = true;
219
220 return cancel_smb2_aio(state->smbreq);
221 }
222
223 static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
224 struct tevent_context *ev,
225 struct smbd_smb2_request *smb2req,
226 uint32_t in_smbpid,
227 uint64_t in_file_id_volatile,
228 DATA_BLOB in_data,
229 uint64_t in_offset,
230 uint32_t in_flags)
231 {
232 NTSTATUS status;
233 struct tevent_req *req = NULL;
234 struct smbd_smb2_write_state *state = NULL;
235 struct smb_request *smbreq = NULL;
236 connection_struct *conn = smb2req->tcon->compat_conn;
237 files_struct *fsp = NULL;
238 ssize_t nwritten;
239 struct lock_struct lock;
240
241 req = tevent_req_create(mem_ctx, &state,
242 struct smbd_smb2_write_state);
243 if (req == NULL) {
244 return NULL;
245 }
246 state->smb2req = smb2req;
247 if (in_flags & SMB2_WRITEFLAG_WRITE_THROUGH) {
248 state->write_through = true;
249 }
250 state->in_length = in_data.length;
251 state->out_count = 0;
252
253 DEBUG(10,("smbd_smb2_write: file_id[0x%016llX]\n",
254 (unsigned long long)in_file_id_volatile));
255
256 smbreq = smbd_smb2_fake_smb_request(smb2req);
257 if (tevent_req_nomem(smbreq, req)) {
258 return tevent_req_post(req, ev);
259 }
260 state->smbreq = smbreq;
261
262 fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
263 if (fsp == NULL) {
264 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
265 return tevent_req_post(req, ev);
266 }
267 if (conn != fsp->conn) {
268 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
269 return tevent_req_post(req, ev);
270 }
271 if (smb2req->session->vuid != fsp->vuid) {
272 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
273 return tevent_req_post(req, ev);
274 }
275
276 state->fsp = fsp;
277
278 if (IS_IPC(smbreq->conn)) {
279 struct tevent_req *subreq = NULL;
280
281 if (!fsp_is_np(fsp)) {
282 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
283 return tevent_req_post(req, ev);
284 }
285
286 subreq = np_write_send(state, ev,
287 fsp->fake_file_handle,
288 in_data.data,
289 in_data.length);
290 if (tevent_req_nomem(subreq, req)) {
291 return tevent_req_post(req, ev);
292 }
293 tevent_req_set_callback(subreq,
294 smbd_smb2_write_pipe_done,
295 req);
296 return req;
297 }
298
299 if (!CHECK_WRITE(fsp)) {
300 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
301 return tevent_req_post(req, ev);
302 }
303
304 /* Try and do an asynchronous write. */
305 status = schedule_aio_smb2_write(conn,
306 smbreq,
307 fsp,
308 in_offset,
309 in_data,
310 state->write_through);
311
312 if (NT_STATUS_IS_OK(status)) {
313 /*
314 * Doing an async write, allow this
315 * request to be canceled
316 */
317 tevent_req_set_cancel_fn(req, smbd_smb2_write_cancel);
318 return req;
319 }
320
321 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
322 /* Real error in setting up aio. Fail. */
323 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
324 return tevent_req_post(req, ev);
325 }
326
327 /* Fallback to synchronous. */
328 init_strict_lock_struct(fsp,
329 in_file_id_volatile,
330 in_offset,
331 in_data.length,
332 WRITE_LOCK,
333 &lock);
334
335 if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
336 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
337 return tevent_req_post(req, ev);
338 }
339
340 nwritten = write_file(smbreq, fsp,
341 (const char *)in_data.data,
342 in_offset,
343 in_data.length);
344
345 status = smb2_write_complete(req, nwritten, errno);
346
347 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
348
349 DEBUG(10,("smb2: write on "
350 "file %s, offset %.0f, requested %u, written = %u\n",
351 fsp_str_dbg(fsp),
352 (double)in_offset,
353 (unsigned int)in_data.length,
354 (unsigned int)nwritten ));
355
356 if (!NT_STATUS_IS_OK(status)) {
357 tevent_req_nterror(req, status);
358 } else {
359 /* Success. */
360 tevent_req_done(req);
361 }
362
363 return tevent_req_post(req, ev);
364 }
365
366 static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
367 {
368 struct tevent_req *req = tevent_req_callback_data(subreq,
369 struct tevent_req);
370 struct smbd_smb2_write_state *state = tevent_req_data(req,
371 struct smbd_smb2_write_state);
372 NTSTATUS status;
373 ssize_t nwritten = -1;
374
375 status = np_write_recv(subreq, &nwritten);
376 TALLOC_FREE(subreq);
377 if (!NT_STATUS_IS_OK(status)) {
378 tevent_req_nterror(req, status);
379 return;
380 }
381
382 if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
383 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
384 return;
385 }
386
387 state->out_count = nwritten;
388
389 tevent_req_done(req);
390 }
391
392 static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
393 uint32_t *out_count)
394 {
395 NTSTATUS status;
396 struct smbd_smb2_write_state *state = tevent_req_data(req,
397 struct smbd_smb2_write_state);
398
399 if (tevent_req_is_nterror(req, &status)) {
400 tevent_req_received(req);
401 return status;
402 }
403
404 *out_count = state->out_count;
405
406 tevent_req_received(req);
407 return NT_STATUS_OK;
408 }
reg import