Convert np_read to tevent_req
[ira/wip.git] / source3 / smbd / pipes.c
1 /* 
2    Unix SMB/CIFS implementation.
3    Pipe SMB reply routines
4    Copyright (C) Andrew Tridgell 1992-1998
5    Copyright (C) Luke Kenneth Casson Leighton 1996-1998
6    Copyright (C) Paul Ashton  1997-1998.
7    Copyright (C) Jeremy Allison 2005.
8    
9    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License as published by
11    the Free Software Foundation; either version 3 of the License, or
12    (at your option) any later version.
13    
14    This program is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17    GNU General Public License for more details.
18    
19    You should have received a copy of the GNU General Public License
20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
21 */
22 /*
23    This file handles reply_ calls on named pipes that the server
24    makes to handle specific protocols
25 */
26
27
28 #include "includes.h"
29
30 #define PIPE            "\\PIPE\\"
31 #define PIPELEN         strlen(PIPE)
32
33 #define MAX_PIPE_NAME_LEN       24
34
35 NTSTATUS open_np_file(struct smb_request *smb_req, const char *name,
36                       struct files_struct **pfsp)
37 {
38         struct connection_struct *conn = smb_req->conn;
39         struct files_struct *fsp;
40         NTSTATUS status;
41
42         status = file_new(smb_req, conn, &fsp);
43         if (!NT_STATUS_IS_OK(status)) {
44                 DEBUG(0, ("file_new failed: %s\n", nt_errstr(status)));
45                 return status;
46         }
47
48         fsp->conn = conn;
49         fsp->fh->fd = -1;
50         fsp->vuid = smb_req->vuid;
51         fsp->can_lock = false;
52         fsp->access_mask = FILE_READ_DATA | FILE_WRITE_DATA;
53         string_set(&fsp->fsp_name, name);
54
55         status = np_open(NULL, name, conn->client_address,
56                          conn->server_info, &fsp->fake_file_handle);
57         if (!NT_STATUS_IS_OK(status)) {
58                 DEBUG(10, ("np_open(%s) returned %s\n", name,
59                            nt_errstr(status)));
60                 file_free(smb_req, fsp);
61                 return status;
62         }
63
64         *pfsp = fsp;
65
66         return NT_STATUS_OK;
67 }
68
69 /****************************************************************************
70  Reply to an open and X on a named pipe.
71  This code is basically stolen from reply_open_and_X with some
72  wrinkles to handle pipes.
73 ****************************************************************************/
74
75 void reply_open_pipe_and_X(connection_struct *conn, struct smb_request *req)
76 {
77         const char *fname = NULL;
78         char *pipe_name = NULL;
79         files_struct *fsp;
80         TALLOC_CTX *ctx = talloc_tos();
81         NTSTATUS status;
82
83         /* XXXX we need to handle passed times, sattr and flags */
84         srvstr_pull_req_talloc(ctx, req, &pipe_name, req->buf, STR_TERMINATE);
85         if (!pipe_name) {
86                 reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
87                                 ERRDOS, ERRbadpipe);
88                 return;
89         }
90
91         /* If the name doesn't start \PIPE\ then this is directed */
92         /* at a mailslot or something we really, really don't understand, */
93         /* not just something we really don't understand. */
94         if ( strncmp(pipe_name,PIPE,PIPELEN) != 0 ) {
95                 reply_doserror(req, ERRSRV, ERRaccess);
96                 return;
97         }
98
99         DEBUG(4,("Opening pipe %s.\n", pipe_name));
100
101         /* Strip \PIPE\ off the name. */
102         fname = pipe_name + PIPELEN;
103
104 #if 0
105         /*
106          * Hack for NT printers... JRA.
107          */
108         if(should_fail_next_srvsvc_open(fname)) {
109                 reply_doserror(req, ERRSRV, ERRaccess);
110                 return;
111         }
112 #endif
113
114         status = open_np_file(req, fname, &fsp);
115         if (!NT_STATUS_IS_OK(status)) {
116                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
117                         reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
118                                         ERRDOS, ERRbadpipe);
119                         return;
120                 }
121                 reply_nterror(req, status);
122                 return;
123         }
124
125         /* Prepare the reply */
126         reply_outbuf(req, 15, 0);
127
128         /* Mark the opened file as an existing named pipe in message mode. */
129         SSVAL(req->outbuf,smb_vwv9,2);
130         SSVAL(req->outbuf,smb_vwv10,0xc700);
131
132         SSVAL(req->outbuf, smb_vwv2, fsp->fnum);
133         SSVAL(req->outbuf, smb_vwv3, 0);        /* fmode */
134         srv_put_dos_date3((char *)req->outbuf, smb_vwv4, 0);    /* mtime */
135         SIVAL(req->outbuf, smb_vwv6, 0);        /* size */
136         SSVAL(req->outbuf, smb_vwv8, 0);        /* rmode */
137         SSVAL(req->outbuf, smb_vwv11, 0x0001);
138
139         chain_reply(req);
140         return;
141 }
142
143 /****************************************************************************
144  Reply to a write on a pipe.
145 ****************************************************************************/
146
147 struct pipe_write_state {
148         size_t numtowrite;
149 };
150
151 static void pipe_write_done(struct tevent_req *subreq);
152
153 void reply_pipe_write(struct smb_request *req)
154 {
155         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
156         const uint8_t *data;
157         struct pipe_write_state *state;
158         struct tevent_req *subreq;
159
160         if (!fsp_is_np(fsp)) {
161                 reply_doserror(req, ERRDOS, ERRbadfid);
162                 return;
163         }
164
165         if (fsp->vuid != req->vuid) {
166                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
167                 return;
168         }
169
170         state = talloc(req, struct pipe_write_state);
171         if (state == NULL) {
172                 reply_nterror(req, NT_STATUS_NO_MEMORY);
173                 return;
174         }
175         req->async_priv = state;
176
177         state->numtowrite = SVAL(req->vwv+1, 0);
178
179         data = req->buf + 3;
180
181         DEBUG(6, ("reply_pipe_write: %x name: %s len: %d\n", (int)fsp->fnum,
182                   fsp->fsp_name, (int)state->numtowrite));
183
184         subreq = np_write_send(state, smbd_event_context(),
185                                fsp->fake_file_handle, data, state->numtowrite);
186         if (subreq == NULL) {
187                 TALLOC_FREE(state);
188                 reply_nterror(req, NT_STATUS_NO_MEMORY);
189                 return;
190         }
191         tevent_req_set_callback(subreq, pipe_write_done,
192                                 talloc_move(req->conn, &req));
193 }
194
195 static void pipe_write_done(struct tevent_req *subreq)
196 {
197         struct smb_request *req = tevent_req_callback_data(
198                 subreq, struct smb_request);
199         struct pipe_write_state *state = talloc_get_type_abort(
200                 req->async_priv, struct pipe_write_state);
201         NTSTATUS status;
202         ssize_t nwritten = -1;
203
204         status = np_write_recv(subreq, &nwritten);
205         TALLOC_FREE(subreq);
206         if ((nwritten == 0 && state->numtowrite != 0) || (nwritten < 0)) {
207                 reply_unixerror(req, ERRDOS, ERRnoaccess);
208                 goto send;
209         }
210
211         reply_outbuf(req, 1, 0);
212
213         SSVAL(req->outbuf,smb_vwv0,nwritten);
214
215         DEBUG(3,("write-IPC nwritten=%d\n", (int)nwritten));
216
217  send:
218         if (!srv_send_smb(smbd_server_fd(), (char *)req->outbuf,
219                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
220                           &req->pcd)) {
221                 exit_server_cleanly("construct_reply: srv_send_smb failed.");
222         }
223         TALLOC_FREE(req);
224 }
225
226 /****************************************************************************
227  Reply to a write and X.
228
229  This code is basically stolen from reply_write_and_X with some
230  wrinkles to handle pipes.
231 ****************************************************************************/
232
233 struct pipe_write_andx_state {
234         bool pipe_start_message_raw;
235         size_t numtowrite;
236 };
237
238 static void pipe_write_andx_done(struct tevent_req *subreq);
239
240 void reply_pipe_write_and_X(struct smb_request *req)
241 {
242         files_struct *fsp = file_fsp(req, SVAL(req->vwv+2, 0));
243         int smb_doff = SVAL(req->vwv+11, 0);
244         uint8_t *data;
245         struct pipe_write_andx_state *state;
246         struct tevent_req *subreq;
247
248         if (!fsp_is_np(fsp)) {
249                 reply_doserror(req, ERRDOS, ERRbadfid);
250                 return;
251         }
252
253         if (fsp->vuid != req->vuid) {
254                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
255                 return;
256         }
257
258         state = talloc(req, struct pipe_write_andx_state);
259         if (state == NULL) {
260                 reply_nterror(req, NT_STATUS_NO_MEMORY);
261                 return;
262         }
263         req->async_priv = state;
264
265         state->numtowrite = SVAL(req->vwv+10, 0);
266         state->pipe_start_message_raw =
267                 ((SVAL(req->vwv+7, 0) & (PIPE_START_MESSAGE|PIPE_RAW_MODE))
268                  == (PIPE_START_MESSAGE|PIPE_RAW_MODE));
269
270         DEBUG(6, ("reply_pipe_write_and_X: %x name: %s len: %d\n",
271                   (int)fsp->fnum, fsp->fsp_name, (int)state->numtowrite));
272
273         data = (uint8_t *)smb_base(req->inbuf) + smb_doff;
274
275         if (state->pipe_start_message_raw) {
276                 /*
277                  * For the start of a message in named pipe byte mode,
278                  * the first two bytes are a length-of-pdu field. Ignore
279                  * them (we don't trust the client). JRA.
280                  */
281                 if (state->numtowrite < 2) {
282                         DEBUG(0,("reply_pipe_write_and_X: start of message "
283                                  "set and not enough data sent.(%u)\n",
284                                  (unsigned int)state->numtowrite ));
285                         reply_unixerror(req, ERRDOS, ERRnoaccess);
286                         return;
287                 }
288
289                 data += 2;
290                 state->numtowrite -= 2;
291         }
292
293         subreq = np_write_send(state, smbd_event_context(),
294                                fsp->fake_file_handle, data, state->numtowrite);
295         if (subreq == NULL) {
296                 TALLOC_FREE(state);
297                 reply_nterror(req, NT_STATUS_NO_MEMORY);
298                 return;
299         }
300         tevent_req_set_callback(subreq, pipe_write_andx_done,
301                                 talloc_move(req->conn, &req));
302 }
303
304 static void pipe_write_andx_done(struct tevent_req *subreq)
305 {
306         struct smb_request *req = tevent_req_callback_data(
307                 subreq, struct smb_request);
308         struct pipe_write_andx_state *state = talloc_get_type_abort(
309                 req->async_priv, struct pipe_write_andx_state);
310         NTSTATUS status;
311         ssize_t nwritten = -1;
312
313         status = np_write_recv(subreq, &nwritten);
314         TALLOC_FREE(subreq);
315         if (!NT_STATUS_IS_OK(status) || (nwritten != state->numtowrite)) {
316                 reply_unixerror(req, ERRDOS,ERRnoaccess);
317                 goto done;
318         }
319
320         reply_outbuf(req, 6, 0);
321
322         nwritten = (state->pipe_start_message_raw ? nwritten + 2 : nwritten);
323         SSVAL(req->outbuf,smb_vwv2,nwritten);
324
325         DEBUG(3,("writeX-IPC nwritten=%d\n", (int)nwritten));
326
327  done:
328         chain_reply(req);
329 }
330
331 /****************************************************************************
332  Reply to a read and X.
333  This code is basically stolen from reply_read_and_X with some
334  wrinkles to handle pipes.
335 ****************************************************************************/
336
337 struct pipe_read_andx_state {
338         uint8_t *outbuf;
339         int smb_mincnt;
340         int smb_maxcnt;
341 };
342
343 static void pipe_read_andx_done(struct tevent_req *subreq);
344
345 void reply_pipe_read_and_X(struct smb_request *req)
346 {
347         files_struct *fsp = file_fsp(req, SVAL(req->vwv+0, 0));
348         uint8_t *data;
349         struct pipe_read_andx_state *state;
350         struct tevent_req *subreq;
351
352         /* we don't use the offset given to use for pipe reads. This
353            is deliberate, instead we always return the next lump of
354            data on the pipe */
355 #if 0
356         uint32 smb_offs = IVAL(req->vwv+3, 0);
357 #endif
358
359         if (!fsp_is_np(fsp)) {
360                 reply_doserror(req, ERRDOS, ERRbadfid);
361                 return;
362         }
363
364         if (fsp->vuid != req->vuid) {
365                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
366                 return;
367         }
368
369         state = talloc(req, struct pipe_read_andx_state);
370         if (state == NULL) {
371                 reply_nterror(req, NT_STATUS_NO_MEMORY);
372                 return;
373         }
374         req->async_priv = state;
375
376         state->smb_maxcnt = SVAL(req->vwv+5, 0);
377         state->smb_mincnt = SVAL(req->vwv+6, 0);
378
379         reply_outbuf(req, 12, state->smb_maxcnt);
380         data = (uint8_t *)smb_buf(req->outbuf);
381
382         /*
383          * We have to tell the upper layers that we're async.
384          */
385         state->outbuf = req->outbuf;
386         req->outbuf = NULL;
387
388         subreq = np_read_send(state, smbd_event_context(),
389                               fsp->fake_file_handle, data,
390                               state->smb_maxcnt);
391         if (subreq == NULL) {
392                 reply_nterror(req, NT_STATUS_NO_MEMORY);
393                 return;
394         }
395         tevent_req_set_callback(subreq, pipe_read_andx_done,
396                                 talloc_move(req->conn, &req));
397 }
398
399 static void pipe_read_andx_done(struct tevent_req *subreq)
400 {
401         struct smb_request *req = tevent_req_callback_data(
402                 subreq, struct smb_request);
403         struct pipe_read_andx_state *state = talloc_get_type_abort(
404                 req->async_priv, struct pipe_read_andx_state);
405         NTSTATUS status;
406         ssize_t nread;
407         bool is_data_outstanding;
408
409         status = np_read_recv(subreq, &nread, &is_data_outstanding);
410         TALLOC_FREE(subreq);
411         if (!NT_STATUS_IS_OK(status)) {
412                 reply_nterror(req, status);
413                 goto done;
414         }
415
416         req->outbuf = state->outbuf;
417         state->outbuf = NULL;
418
419         srv_set_message((char *)req->outbuf, 12, nread, False);
420   
421         SSVAL(req->outbuf,smb_vwv5,nread);
422         SSVAL(req->outbuf,smb_vwv6,
423               req_wct_ofs(req)
424               + 1               /* the wct field */
425               + 12 * sizeof(uint16_t) /* vwv */
426               + 2);             /* the buflen field */
427         SSVAL(req->outbuf,smb_vwv11,state->smb_maxcnt);
428   
429         DEBUG(3,("readX-IPC min=%d max=%d nread=%d\n",
430                  state->smb_mincnt, state->smb_maxcnt, (int)nread));
431
432  done:
433         chain_reply(req);
434 }