source: branches/samba-3.5.x/source3/smbd/smb2_read.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 9.3 KB
Line 
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/globals.h"
23#include "../libcli/smb/smb_common.h"
24
25static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
26 struct tevent_context *ev,
27 struct smbd_smb2_request *smb2req,
28 uint32_t in_smbpid,
29 uint64_t in_file_id_volatile,
30 uint32_t in_length,
31 uint64_t in_offset,
32 uint32_t in_minimum,
33 uint32_t in_remaining);
34static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
35 TALLOC_CTX *mem_ctx,
36 DATA_BLOB *out_data,
37 uint32_t *out_remaining);
38
39static void smbd_smb2_request_read_done(struct tevent_req *subreq);
40NTSTATUS smbd_smb2_request_process_read(struct smbd_smb2_request *req)
41{
42 const uint8_t *inhdr;
43 const uint8_t *inbody;
44 int i = req->current_idx;
45 size_t expected_body_size = 0x31;
46 size_t body_size;
47 uint32_t in_smbpid;
48 uint32_t in_length;
49 uint64_t in_offset;
50 uint64_t in_file_id_persistent;
51 uint64_t in_file_id_volatile;
52 uint32_t in_minimum_count;
53 uint32_t in_remaining_bytes;
54 struct tevent_req *subreq;
55
56 inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
57 if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
58 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
59 }
60
61 inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
62
63 body_size = SVAL(inbody, 0x00);
64 if (body_size != expected_body_size) {
65 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
66 }
67
68 in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
69
70 in_length = IVAL(inbody, 0x04);
71 in_offset = BVAL(inbody, 0x08);
72 in_file_id_persistent = BVAL(inbody, 0x10);
73 in_file_id_volatile = BVAL(inbody, 0x18);
74 in_minimum_count = IVAL(inbody, 0x20);
75 in_remaining_bytes = IVAL(inbody, 0x28);
76
77 /* check the max read size */
78 if (in_length > 0x00010000) {
79 DEBUG(0,("here:%s: 0x%08X: 0x%08X\n",
80 __location__, in_length, 0x00010000));
81 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
82 }
83
84 if (req->compat_chain_fsp) {
85 /* skip check */
86 } else if (in_file_id_persistent != 0) {
87 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
88 }
89
90 subreq = smbd_smb2_read_send(req,
91 req->sconn->smb2.event_ctx,
92 req,
93 in_smbpid,
94 in_file_id_volatile,
95 in_length,
96 in_offset,
97 in_minimum_count,
98 in_remaining_bytes);
99 if (subreq == NULL) {
100 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
101 }
102 tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
103
104 return smbd_smb2_request_pending_queue(req, subreq);
105}
106
107static void smbd_smb2_request_read_done(struct tevent_req *subreq)
108{
109 struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
110 struct smbd_smb2_request);
111 int i = req->current_idx;
112 uint8_t *outhdr;
113 DATA_BLOB outbody;
114 DATA_BLOB outdyn;
115 uint8_t out_data_offset;
116 DATA_BLOB out_data_buffer = data_blob_null;
117 uint32_t out_data_remaining = 0;
118 NTSTATUS status;
119 NTSTATUS error; /* transport error */
120
121 status = smbd_smb2_read_recv(subreq,
122 req,
123 &out_data_buffer,
124 &out_data_remaining);
125 TALLOC_FREE(subreq);
126 if (!NT_STATUS_IS_OK(status)) {
127 error = smbd_smb2_request_error(req, status);
128 if (!NT_STATUS_IS_OK(error)) {
129 smbd_server_connection_terminate(req->sconn,
130 nt_errstr(error));
131 return;
132 }
133 return;
134 }
135
136 out_data_offset = SMB2_HDR_BODY + 0x10;
137
138 outhdr = (uint8_t *)req->out.vector[i].iov_base;
139
140 outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
141 if (outbody.data == NULL) {
142 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
143 if (!NT_STATUS_IS_OK(error)) {
144 smbd_server_connection_terminate(req->sconn,
145 nt_errstr(error));
146 return;
147 }
148 return;
149 }
150
151 SSVAL(outbody.data, 0x00, 0x10 + 1); /* struct size */
152 SCVAL(outbody.data, 0x02,
153 out_data_offset); /* data offset */
154 SCVAL(outbody.data, 0x03, 0); /* reserved */
155 SIVAL(outbody.data, 0x04,
156 out_data_buffer.length); /* data length */
157 SIVAL(outbody.data, 0x08,
158 out_data_remaining); /* data remaining */
159 SIVAL(outbody.data, 0x0C, 0); /* reserved */
160
161 outdyn = out_data_buffer;
162
163 error = smbd_smb2_request_done(req, outbody, &outdyn);
164 if (!NT_STATUS_IS_OK(error)) {
165 smbd_server_connection_terminate(req->sconn,
166 nt_errstr(error));
167 return;
168 }
169}
170
171struct smbd_smb2_read_state {
172 struct smbd_smb2_request *smb2req;
173 DATA_BLOB out_data;
174 uint32_t out_remaining;
175};
176
177static void smbd_smb2_read_pipe_done(struct tevent_req *subreq);
178
179static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
180 struct tevent_context *ev,
181 struct smbd_smb2_request *smb2req,
182 uint32_t in_smbpid,
183 uint64_t in_file_id_volatile,
184 uint32_t in_length,
185 uint64_t in_offset,
186 uint32_t in_minimum,
187 uint32_t in_remaining)
188{
189 struct tevent_req *req;
190 struct smbd_smb2_read_state *state;
191 struct smb_request *smbreq;
192 connection_struct *conn = smb2req->tcon->compat_conn;
193 files_struct *fsp;
194 ssize_t nread = -1;
195 struct lock_struct lock;
196
197 req = tevent_req_create(mem_ctx, &state,
198 struct smbd_smb2_read_state);
199 if (req == NULL) {
200 return NULL;
201 }
202 state->smb2req = smb2req;
203 state->out_data = data_blob_null;
204 state->out_remaining = 0;
205
206 DEBUG(10,("smbd_smb2_read: file_id[0x%016llX]\n",
207 (unsigned long long)in_file_id_volatile));
208
209 smbreq = smbd_smb2_fake_smb_request(smb2req);
210 if (tevent_req_nomem(smbreq, req)) {
211 return tevent_req_post(req, ev);
212 }
213
214 fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
215 if (fsp == NULL) {
216 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
217 return tevent_req_post(req, ev);
218 }
219 if (conn != fsp->conn) {
220 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
221 return tevent_req_post(req, ev);
222 }
223 if (smb2req->session->vuid != fsp->vuid) {
224 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
225 return tevent_req_post(req, ev);
226 }
227
228 state->out_data = data_blob_talloc(state, NULL, in_length);
229 if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
230 return tevent_req_post(req, ev);
231 }
232
233 if (IS_IPC(smbreq->conn)) {
234 struct tevent_req *subreq;
235
236 if (!fsp_is_np(fsp)) {
237 tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
238 return tevent_req_post(req, ev);
239 }
240
241 subreq = np_read_send(state, smbd_event_context(),
242 fsp->fake_file_handle,
243 state->out_data.data,
244 state->out_data.length);
245 if (tevent_req_nomem(subreq, req)) {
246 return tevent_req_post(req, ev);
247 }
248 tevent_req_set_callback(subreq,
249 smbd_smb2_read_pipe_done,
250 req);
251 return req;
252 }
253
254 if (!CHECK_READ(fsp, smbreq)) {
255 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
256 return tevent_req_post(req, ev);
257 }
258
259 init_strict_lock_struct(fsp,
260 in_smbpid,
261 in_offset,
262 in_length,
263 READ_LOCK,
264 &lock);
265
266 if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
267 tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
268 return tevent_req_post(req, ev);
269 }
270
271 nread = read_file(fsp,
272 (char *)state->out_data.data,
273 in_offset,
274 in_length);
275
276 SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
277
278 if (nread < 0) {
279 DEBUG(5,("smbd_smb2_read: read_file[%s] nread[%lld]\n",
280 fsp_str_dbg(fsp), (long long)nread));
281 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
282 return tevent_req_post(req, ev);
283 }
284 if (nread == 0 && in_length != 0) {
285 DEBUG(5,("smbd_smb2_read: read_file[%s] end of file\n",
286 fsp_str_dbg(fsp)));
287 tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
288 return tevent_req_post(req, ev);
289 }
290
291 state->out_data.length = nread;
292 state->out_remaining = 0;
293 tevent_req_done(req);
294 return tevent_req_post(req, ev);
295}
296
297static void smbd_smb2_read_pipe_done(struct tevent_req *subreq)
298{
299 struct tevent_req *req = tevent_req_callback_data(subreq,
300 struct tevent_req);
301 struct smbd_smb2_read_state *state = tevent_req_data(req,
302 struct smbd_smb2_read_state);
303 NTSTATUS status;
304 ssize_t nread = -1;
305 bool is_data_outstanding;
306
307 status = np_read_recv(subreq, &nread, &is_data_outstanding);
308 TALLOC_FREE(subreq);
309 if (!NT_STATUS_IS_OK(status)) {
310 tevent_req_nterror(req, status);
311 return;
312 }
313
314 if (nread == 0 && state->out_data.length != 0) {
315 tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
316 return;
317 }
318
319 state->out_data.length = nread;
320 state->out_remaining = 0;
321
322 tevent_req_done(req);
323}
324
325static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
326 TALLOC_CTX *mem_ctx,
327 DATA_BLOB *out_data,
328 uint32_t *out_remaining)
329{
330 NTSTATUS status;
331 struct smbd_smb2_read_state *state = tevent_req_data(req,
332 struct smbd_smb2_read_state);
333
334 if (tevent_req_is_nterror(req, &status)) {
335 tevent_req_received(req);
336 return status;
337 }
338
339 *out_data = state->out_data;
340 talloc_steal(mem_ctx, out_data->data);
341 *out_remaining = state->out_remaining;
342
343 tevent_req_received(req);
344 return NT_STATUS_OK;
345}
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