summaryrefslogtreecommitdiff
path: root/source3/smbd/pipes.c
blob: f43e243453caa900b24c6f235bf10641f3e08dd8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
/* 
   Unix SMB/CIFS implementation.
   Pipe SMB reply routines
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Luke Kenneth Casson Leighton 1996-1998
   Copyright (C) Paul Ashton  1997-1998.
   Copyright (C) Jeremy Allison 2005.
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
/*
   This file handles reply_ calls on named pipes that the server
   makes to handle specific protocols
*/


#include "includes.h"

#define	PIPE		"\\PIPE\\"
#define	PIPELEN		strlen(PIPE)

#define MAX_PIPE_NAME_LEN	24

/* PIPE/<name>/<pid>/<pnum> */
#define PIPEDB_KEY_FORMAT "PIPE/%s/%u/%d"

struct pipe_dbrec {
	struct server_id pid;
	int pnum;
	uid_t uid;

	char name[MAX_PIPE_NAME_LEN];
	fstring	user;
};


extern struct pipe_id_info pipe_names[];

/****************************************************************************
 Reply to an open and X on a named pipe.
 This code is basically stolen from reply_open_and_X with some
 wrinkles to handle pipes.
****************************************************************************/

void reply_open_pipe_and_X(connection_struct *conn, struct smb_request *req)
{
	pstring fname;
	pstring pipe_name;
	smb_np_struct *p;
	int size=0,fmode=0,mtime=0,rmode=0;
	int i;

	/* XXXX we need to handle passed times, sattr and flags */
	srvstr_pull_buf(req->inbuf, req->flags2, pipe_name,
			smb_buf(req->inbuf), sizeof(pipe_name), STR_TERMINATE);

	/* If the name doesn't start \PIPE\ then this is directed */
	/* at a mailslot or something we really, really don't understand, */
	/* not just something we really don't understand. */
	if ( strncmp(pipe_name,PIPE,PIPELEN) != 0 ) {
		reply_doserror(req, ERRSRV, ERRaccess);
		return;
	}

	DEBUG(4,("Opening pipe %s.\n", pipe_name));

	/* See if it is one we want to handle. */
	for( i = 0; pipe_names[i].client_pipe ; i++ ) {
		if( strequal(pipe_name,pipe_names[i].client_pipe)) {
			break;
		}
	}

	if (pipe_names[i].client_pipe == NULL) {
		reply_botherror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND,
				ERRDOS, ERRbadpipe);
		return;
	}

	/* Strip \PIPE\ off the name. */
	pstrcpy(fname, pipe_name + PIPELEN);

#if 0
	/*
	 * Hack for NT printers... JRA.
	 */
	if(should_fail_next_srvsvc_open(fname)) {
		reply_doserror(req, ERRSRV, ERRaccess);
		return;
	}
#endif

	/* Known pipes arrive with DIR attribs. Remove it so a regular file */
	/* can be opened and add it in after the open. */
	DEBUG(3,("Known pipe %s opening.\n",fname));

	p = open_rpc_pipe_p(fname, conn, req->vuid);
	if (!p) {
		reply_doserror(req, ERRSRV, ERRnofids);
		return;
	}

	/* Prepare the reply */
	reply_outbuf(req, 15, 0);

	/* Mark the opened file as an existing named pipe in message mode. */
	SSVAL(req->outbuf,smb_vwv9,2);
	SSVAL(req->outbuf,smb_vwv10,0xc700);

	if (rmode == 2) {
		DEBUG(4,("Resetting open result to open from create.\n"));
		rmode = 1;
	}

	SSVAL(req->outbuf,smb_vwv2, p->pnum);
	SSVAL(req->outbuf,smb_vwv3,fmode);
	srv_put_dos_date3((char *)req->outbuf,smb_vwv4,mtime);
	SIVAL(req->outbuf,smb_vwv6,size);
	SSVAL(req->outbuf,smb_vwv8,rmode);
	SSVAL(req->outbuf,smb_vwv11,0x0001);

	chain_reply(req);
	return;
}

/****************************************************************************
 Reply to a write on a pipe.
****************************************************************************/

void reply_pipe_write(struct smb_request *req)
{
	smb_np_struct *p = get_rpc_pipe_p(SVAL(req->inbuf,smb_vwv0));
	size_t numtowrite = SVAL(req->inbuf,smb_vwv1);
	int nwritten;
	char *data;

	if (!p) {
		reply_doserror(req, ERRDOS, ERRbadfid);
		return;
	}

	if (p->vuid != req->vuid) {
		reply_nterror(req, NT_STATUS_INVALID_HANDLE);
		return;
	}

	data = smb_buf(req->inbuf) + 3;

	if (numtowrite == 0) {
		nwritten = 0;
	} else {
		nwritten = write_to_pipe(p, data, numtowrite);
	}

	if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0)) {
		reply_unixerror(req, ERRDOS, ERRnoaccess);
		return;
	}

	reply_outbuf(req, 1, 0);

	SSVAL(req->outbuf,smb_vwv0,nwritten);
  
	DEBUG(3,("write-IPC pnum=%04x nwritten=%d\n", p->pnum, nwritten));

	return;
}

/****************************************************************************
 Reply to a write and X.

 This code is basically stolen from reply_write_and_X with some
 wrinkles to handle pipes.
****************************************************************************/

void reply_pipe_write_and_X(struct smb_request *req)
{
	smb_np_struct *p = get_rpc_pipe_p(SVAL(req->inbuf,smb_vwv2));
	size_t numtowrite = SVAL(req->inbuf,smb_vwv10);
	int nwritten = -1;
	int smb_doff = SVAL(req->inbuf, smb_vwv11);
	BOOL pipe_start_message_raw =
		((SVAL(req->inbuf, smb_vwv7)
		  & (PIPE_START_MESSAGE|PIPE_RAW_MODE))
		 == (PIPE_START_MESSAGE|PIPE_RAW_MODE));
	char *data;

	if (!p) {
		reply_doserror(req, ERRDOS, ERRbadfid);
		return;
	}

	if (p->vuid != req->vuid) {
		reply_nterror(req, NT_STATUS_INVALID_HANDLE);
		return;
	}

	data = smb_base(req->inbuf) + smb_doff;

	if (numtowrite == 0) {
		nwritten = 0;
	} else {
		if(pipe_start_message_raw) {
			/*
			 * For the start of a message in named pipe byte mode,
			 * the first two bytes are a length-of-pdu field. Ignore
			 * them (we don't trust the client). JRA.
			 */
	 	       if(numtowrite < 2) {
				DEBUG(0,("reply_pipe_write_and_X: start of "
					 "message set and not enough data "
					 "sent.(%u)\n",
					 (unsigned int)numtowrite ));
				reply_unixerror(req, ERRDOS, ERRnoaccess);
				return;
			}

			data += 2;
			numtowrite -= 2;
		}                        
		nwritten = write_to_pipe(p, data, numtowrite);
	}

	if ((nwritten == 0 && numtowrite != 0) || (nwritten < 0)) {
		reply_unixerror(req, ERRDOS,ERRnoaccess);
		return;
	}

	reply_outbuf(req, 6, 0);

	nwritten = (pipe_start_message_raw ? nwritten + 2 : nwritten);
	SSVAL(req->outbuf,smb_vwv2,nwritten);
  
	DEBUG(3,("writeX-IPC pnum=%04x nwritten=%d\n", p->pnum, nwritten));

	chain_reply(req);
}

/****************************************************************************
 Reply to a read and X.
 This code is basically stolen from reply_read_and_X with some
 wrinkles to handle pipes.
****************************************************************************/

void reply_pipe_read_and_X(struct smb_request *req)
{
	smb_np_struct *p = get_rpc_pipe_p(SVAL(req->inbuf,smb_vwv2));
	int smb_maxcnt = SVAL(req->inbuf,smb_vwv5);
	int smb_mincnt = SVAL(req->inbuf,smb_vwv6);
	int nread = -1;
	char *data;
	BOOL unused;

	/* we don't use the offset given to use for pipe reads. This
           is deliberate, instead we always return the next lump of
           data on the pipe */
#if 0
	uint32 smb_offs = IVAL(req->inbuf,smb_vwv3);
#endif

	if (!p) {
		reply_doserror(req, ERRDOS, ERRbadfid);
		return;
	}

	reply_outbuf(req, 12, smb_maxcnt);

	data = smb_buf(req->outbuf);

	nread = read_from_pipe(p, data, smb_maxcnt, &unused);

	if (nread < 0) {
		reply_doserror(req, ERRDOS, ERRnoaccess);
		return;
	}

	set_message(NULL, (char *)req->outbuf, 12, nread, False);
  
	SSVAL(req->outbuf,smb_vwv5,nread);
	SSVAL(req->outbuf,smb_vwv6,smb_offset(data,req->outbuf));
	SSVAL(smb_buf(req->outbuf),-2,nread);
  
	DEBUG(3,("readX-IPC pnum=%04x min=%d max=%d nread=%d\n",
		 p->pnum, smb_mincnt, smb_maxcnt, nread));

	chain_reply(req);
}

/****************************************************************************
 Reply to a close.
****************************************************************************/

void reply_pipe_close(connection_struct *conn, struct smb_request *req)
{
	smb_np_struct *p = get_rpc_pipe_p(SVAL(req->inbuf,smb_vwv0));

	if (!p) {
		reply_doserror(req, ERRDOS, ERRbadfid);
		return;
	}

	DEBUG(5,("reply_pipe_close: pnum:%x\n", p->pnum));

	if (!close_rpc_pipe_hnd(p)) {
		reply_doserror(req, ERRDOS, ERRbadfid);
		return;
	}
	
	/* TODO: REMOVE PIPE FROM DB */

	reply_outbuf(req, 0, 0);
	return;
}