summaryrefslogtreecommitdiff
path: root/source3/rpc_server/srv_pipe_hnd.c
blob: b1aede61669b0013cfcb689b249b98bbee05d0eb (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
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416

/* 
 *  Unix SMB/Netbios implementation.
 *  Version 1.9.
 *  RPC Pipe client / server routines
 *  Copyright (C) Andrew Tridgell              1992-1997,
 *  Copyright (C) Luke Kenneth Casson Leighton 1996-1997,
 *  
 *  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 2 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, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


#include "includes.h"


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

extern int DEBUGLEVEL;
static pipes_struct *chain_p;
static int pipes_open;

#ifndef MAX_OPEN_PIPES
#define MAX_OPEN_PIPES 64
#endif

static pipes_struct *Pipes;
static struct bitmap *bmap;

/* this must be larger than the sum of the open files and directories */
static int pipe_handle_offset;

/****************************************************************************
 Set the pipe_handle_offset. Called from smbd/files.c
****************************************************************************/

void set_pipe_handle_offset(int max_open_files)
{
  if(max_open_files < 0x7000)
    pipe_handle_offset = 0x7000;
  else
    pipe_handle_offset = max_open_files + 10; /* For safety. :-) */
}

/****************************************************************************
  reset pipe chain handle number
****************************************************************************/
void reset_chain_p(void)
{
	chain_p = NULL;
}

/****************************************************************************
  initialise pipe handle states...
****************************************************************************/
void init_rpc_pipe_hnd(void)
{
	bmap = bitmap_allocate(MAX_OPEN_PIPES);
	if (!bmap) {
		exit_server("out of memory in init_rpc_pipe_hnd\n");
	}
}


/****************************************************************************
  find first available file slot
****************************************************************************/
pipes_struct *open_rpc_pipe_p(char *pipe_name, 
			      connection_struct *conn, uint16 vuid)
{
	int i;
	pipes_struct *p;
	static int next_pipe;

	DEBUG(4,("Open pipe requested %s (pipes_open=%d)\n",
		 pipe_name, pipes_open));
	
	/* not repeating pipe numbers makes it easier to track things in 
	   log files and prevents client bugs where pipe numbers are reused
	   over connection restarts */
	if (next_pipe == 0) {
		next_pipe = (getpid() ^ time(NULL)) % MAX_OPEN_PIPES;
	}

	i = bitmap_find(bmap, next_pipe);

	if (i == -1) {
		DEBUG(0,("ERROR! Out of pipe structures\n"));
		return NULL;
	}

	next_pipe = (i+1) % MAX_OPEN_PIPES;

	for (p = Pipes; p; p = p->next)
	{
		DEBUG(5,("open pipes: name %s pnum=%x\n", p->name, p->pnum));  
	}

	p = (pipes_struct *)malloc(sizeof(*p));
	if (!p) return NULL;

	ZERO_STRUCTP(p);
	DLIST_ADD(Pipes, p);

	bitmap_set(bmap, i);
	i += pipe_handle_offset;

	pipes_open++;

	p->pnum = i;

	p->open = True;
	p->device_state = 0;
	p->priority = 0;
	p->conn = conn;
	p->vuid  = vuid;
	
	p->rhdr.data  = NULL;
	p->rdata.data = NULL;
	p->rhdr.offset  = 0;
	p->rdata.offset = 0;
	
	p->file_offset     = 0;
	p->hdr_offsets     = 0;
	p->frag_len_left   = 0;
	p->next_frag_start = 0;
	
	fstrcpy(p->name, pipe_name);
	
	DEBUG(4,("Opened pipe %s with handle %x (pipes_open=%d)\n",
		 pipe_name, i, pipes_open));
	
	chain_p = p;
	
	/* OVERWRITE p as a temp variable, to display all open pipes */ 
	for (p = Pipes; p; p = p->next)
	{
		DEBUG(5,("open pipes: name %s pnum=%x\n", p->name, p->pnum));  
	}

	return chain_p;
}


/****************************************************************************
 writes data to a pipe.

 SERIOUSLY ALPHA CODE!
 ****************************************************************************/
int write_pipe(pipes_struct *p, char *data, int n)
{
	prs_struct pd;
	struct mem_buf data_buf;

	DEBUG(6,("write_pipe: %x", p->pnum));

	DEBUG(6,("name: %s open: %s len: %d",
		 p->name, BOOLSTR(p->open), n));

	dump_data(50, data, n);

	/* fake up a data buffer from the write_pipe data parameters */
	mem_create(&data_buf, data, n, 0, False);
	data_buf.offset.start = 0;
	data_buf.offset.end   = n;

	/* fake up a parsing structure */
	pd.data = &data_buf;
	pd.align = 4;
	pd.io = True;
	pd.offset = 0;

	return rpc_command(p, &pd) ? n : -1;
}


/****************************************************************************
 reads data from a pipe.

 headers are interspersed with the data at regular intervals.  by the time
 this function is called, the start of the data could possibly have been
 read by an SMBtrans (file_offset != 0).

 calling create_rpc_request() here is a fudge.  the data should already
 have been prepared into arrays of headers + data stream sections.

 ****************************************************************************/
int read_pipe(pipes_struct *p, char *data, uint32 pos, int n)
{
	int num = 0;
	int len = 0;
	uint32 hdr_num = 0;
	int data_hdr_pos;
	int data_pos;

	DEBUG(6,("read_pipe: %x", p->pnum));

	DEBUG(6,("name: %s open: %s pos: %d len: %d",
		 p->name,
		 BOOLSTR(p->open),
		 pos, n));

	if (!p || !p->open)
	{
		DEBUG(6,("pipe not open\n"));
		return -1;		
	}


	if (p->rhdr.data == NULL || p->rhdr.data->data == NULL ||
	    p->rhdr.data->data_used == 0)
	{
		return 0;
	}

	DEBUG(6,("read_pipe: p: %p file_offset: %d file_pos: %d\n",
		 p, p->file_offset, n));
	DEBUG(6,("read_pipe: frag_len_left: %d next_frag_start: %d\n",
		 p->frag_len_left, p->next_frag_start));

	/* the read request starts from where the SMBtrans2 left off. */
	data_pos     = p->file_offset - p->hdr_offsets;
	data_hdr_pos = p->file_offset;

	len = mem_buf_len(p->rhdr.data);
	num = len - (int)data_pos;
	
	DEBUG(6,("read_pipe: len: %d num: %d n: %d\n", len, num, n));
	
	if (num > n) num = n;
	if (num <= 0)
	{
		DEBUG(5,("read_pipe: 0 or -ve data length\n"));
		return 0;
	}

	if (!IS_BITS_SET_ALL(p->hdr.flags, RPC_FLG_LAST))
	{
		/* intermediate fragment - possibility of another header */
		
		DEBUG(5,("read_pipe: frag_len: %d data_pos: %d data_hdr_pos: %d\n",
			 p->hdr.frag_len, data_pos, data_hdr_pos));
		
		if (data_hdr_pos == p->next_frag_start)
		{
			DEBUG(6,("read_pipe: next fragment header\n"));

			/* this is subtracted from the total data bytes, later */
			hdr_num = 0x18;

			/* create and copy in a new header. */
			create_rpc_reply(p, data_pos, p->rdata.offset);
			mem_buf_copy(data, p->rhdr.data, 0, 0x18);
			
			data += 0x18;
			p->frag_len_left = p->hdr.frag_len;
			p->next_frag_start += p->hdr.frag_len;
			p->hdr_offsets += 0x18;
		}			
	}
	
	if (num < hdr_num)
	{
		DEBUG(5,("read_pipe: warning - data read only part of a header\n"));
	}

	DEBUG(6,("read_pipe: adjusted data_pos: %d num-hdr_num: %d\n",
		 data_pos, num - hdr_num));
	mem_buf_copy(data, p->rhdr.data, data_pos, num - hdr_num);
	
	data_pos += num;
	data_hdr_pos += num;
	
	if (hdr_num == 0x18 && num == 0x18)
	{
		DEBUG(6,("read_pipe: just header read\n"));

		/* advance to the next fragment */
		p->frag_len_left -= 0x18; 
	}
	else if (data_hdr_pos == p->next_frag_start)
	{
		DEBUG(6,("read_pipe: next fragment expected\n"));
	}

	p->file_offset  += num;
	
	return num;
}


/****************************************************************************
  wait device state on a pipe.  exactly what this is for is unknown...
****************************************************************************/
BOOL wait_rpc_pipe_hnd_state(pipes_struct *p, uint16 priority)
{
	if (p == NULL) return False;

	if (p->open)
	{
		DEBUG(3,("%s Setting pipe wait state priority=%x on pipe (name=%s)\n",
		         timestring(), priority, p->name));

		p->priority = priority;
		
		return True;
	} 

	DEBUG(3,("%s Error setting pipe wait state priority=%x (name=%s)\n",
		 timestring(), priority, p->name));
	return False;
}


/****************************************************************************
  set device state on a pipe.  exactly what this is for is unknown...
****************************************************************************/
BOOL set_rpc_pipe_hnd_state(pipes_struct *p, uint16 device_state)
{
	if (p == NULL) return False;

	if (p->open) {
		DEBUG(3,("%s Setting pipe device state=%x on pipe (name=%s)\n",
		         timestring(), device_state, p->name));

		p->device_state = device_state;
		
		return True;
	} 

	DEBUG(3,("%s Error setting pipe device state=%x (name=%s)\n",
		 timestring(), device_state, p->name));
	return False;
}


/****************************************************************************
  close an rpc pipe
****************************************************************************/
BOOL close_rpc_pipe_hnd(pipes_struct *p, connection_struct *conn)
{
	if (!p) {
		DEBUG(0,("Invalid pipe in close_rpc_pipe_hnd\n"));
		return False;
	}

	mem_buf_free(&(p->rdata.data));
	mem_buf_free(&(p->rhdr .data));

	bitmap_clear(bmap, p->pnum - pipe_handle_offset);

	pipes_open--;

	DEBUG(4,("closed pipe name %s pnum=%x (pipes_open=%d)\n", 
		 p->name, p->pnum, pipes_open));  

	DLIST_REMOVE(Pipes, p);

	ZERO_STRUCTP(p);

	free(p);
	
	return True;
}

/****************************************************************************
  close an rpc pipe
****************************************************************************/
pipes_struct *get_rpc_pipe_p(char *buf, int where)
{
	int pnum = SVAL(buf,where);

	if (chain_p) return chain_p;

	return get_rpc_pipe(pnum);
}

/****************************************************************************
  close an rpc pipe
****************************************************************************/
pipes_struct *get_rpc_pipe(int pnum)
{
	pipes_struct *p;

	DEBUG(4,("search for pipe pnum=%x\n", pnum));

	for (p=Pipes;p;p=p->next)
	{
		DEBUG(5,("pipe name %s pnum=%x (pipes_open=%d)\n", 
		          p->name, p->pnum, pipes_open));  
	}

	for (p=Pipes;p;p=p->next)
	{
		if (p->pnum == pnum)
		{
			chain_p = p;
			return p;
		}
	}

	return NULL;
}