GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/rbootd/rmpproto.c Lines: 0 156 0.0 %
Date: 2017-11-13 Branches: 0 84 0.0 %

Line Branch Exec Source
1
/*	$OpenBSD: rmpproto.c,v 1.12 2016/03/16 15:41:11 krw Exp $	*/
2
/*	$NetBSD: rmpproto.c,v 1.5.2.1 1995/11/14 08:45:44 thorpej Exp $	*/
3
4
/*
5
 * Copyright (c) 1988, 1992 The University of Utah and the Center
6
 *	for Software Science (CSS).
7
 * Copyright (c) 1992, 1993
8
 *	The Regents of the University of California.  All rights reserved.
9
 *
10
 * This code is derived from software contributed to Berkeley by
11
 * the Center for Software Science of the University of Utah Computer
12
 * Science Department.  CSS requests users of this software to return
13
 * to css-dist@cs.utah.edu any improvements that they make and grant
14
 * CSS redistribution rights.
15
 *
16
 * Redistribution and use in source and binary forms, with or without
17
 * modification, are permitted provided that the following conditions
18
 * are met:
19
 * 1. Redistributions of source code must retain the above copyright
20
 *    notice, this list of conditions and the following disclaimer.
21
 * 2. Redistributions in binary form must reproduce the above copyright
22
 *    notice, this list of conditions and the following disclaimer in the
23
 *    documentation and/or other materials provided with the distribution.
24
 * 3. Neither the name of the University nor the names of its contributors
25
 *    may be used to endorse or promote products derived from this software
26
 *    without specific prior written permission.
27
 *
28
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38
 * SUCH DAMAGE.
39
 *
40
 *	from: @(#)rmpproto.c	8.1 (Berkeley) 6/4/93
41
 *
42
 * From: Utah Hdr: rmpproto.c 3.1 92/07/06
43
 * Author: Jeff Forys, University of Utah CSS
44
 */
45
46
#include <sys/time.h>
47
48
#include <errno.h>
49
#include <fcntl.h>
50
#include <stdio.h>
51
#include <string.h>
52
#include <syslog.h>
53
#include <unistd.h>
54
#include "defs.h"
55
56
/*
57
**  ProcessPacket -- determine packet type and do what's required.
58
**
59
**	An RMP BOOT packet has been received.  Look at the type field
60
**	and process Boot Requests, Read Requests, and Boot Complete
61
**	packets.  Any other type will be dropped with a warning msg.
62
**
63
**	Parameters:
64
**		rconn - the new connection
65
**		client - list of files available to this host
66
**
67
**	Returns:
68
**		Nothing.
69
**
70
**	Side Effects:
71
**		- If this is a valid boot request, it will be added to
72
**		  the linked list of outstanding requests (RmpConns).
73
**		- If this is a valid boot complete, its associated
74
**		  entry in RmpConns will be deleted.
75
**		- Also, unless we run out of memory, a reply will be
76
**		  sent to the host that sent the packet.
77
*/
78
void
79
ProcessPacket(RMPCONN *rconn, CLIENT *client)
80
{
81
	struct rmp_packet *rmp = &rconn->rmp;
82
	RMPCONN *rconnout;
83
84
	switch (rmp->r_type) {		/* do what we came here to do */
85
	case RMP_BOOT_REQ:		/* boot request */
86
		if ((rconnout = NewConn(rconn)) == NULL)
87
			return;
88
89
		/*
90
		 *  If the Session ID is 0xffff, this is a "probe"
91
		 *  packet and we do not want to add the connection
92
		 *  to the linked list of active connections.  There
93
		 *  are two types of probe packets, if the Sequence
94
		 *  Number is 0 they want to know our host name, o/w
95
		 *  they want the name of the file associated with
96
		 *  the number spec'd by the Sequence Number.
97
		 *
98
		 *  If this is an actual boot request, open the file
99
		 *  and send a reply.  If SendBootRepl() does not
100
		 *  return 0, add the connection to the linked list
101
		 *  of active connections, otherwise delete it since
102
		 *  an error was encountered.
103
		 */
104
		if (ntohs(rmp->r_brq.rmp_session) == RMP_PROBESID) {
105
			if (WORDZE(rmp->r_brq.rmp_seqno))
106
				(void) SendServerID(rconnout);
107
			else
108
				(void) SendFileNo(rmp, rconnout,
109
				    client ? client->files : BootFiles);
110
			FreeConn(rconnout);
111
		} else {
112
			if (SendBootRepl(rmp, rconnout,
113
			    client? client->files: BootFiles))
114
				AddConn(rconnout);
115
			else
116
				FreeConn(rconnout);
117
		}
118
		break;
119
120
	case RMP_BOOT_REPL:		/* boot reply (not valid) */
121
		syslog(LOG_WARNING, "%s: sent a boot reply",
122
		    EnetStr(rconn));
123
		break;
124
125
	case RMP_READ_REQ:		/* read request */
126
		/*
127
		 *  Send a portion of the boot file.
128
		 */
129
		(void) SendReadRepl(rconn);
130
		break;
131
132
	case RMP_READ_REPL:		/* read reply (not valid) */
133
		syslog(LOG_WARNING, "%s: sent a read reply",
134
		    EnetStr(rconn));
135
		break;
136
137
	case RMP_BOOT_DONE:		/* boot complete */
138
		/*
139
		 *  Remove the entry from the linked list of active
140
		 *  connections.
141
		 */
142
		(void) BootDone(rconn);
143
		break;
144
145
	default:			/* unknown RMP packet type */
146
		syslog(LOG_WARNING, "%s: unknown packet type (%u)",
147
		    EnetStr(rconn), rmp->r_type);
148
	}
149
}
150
151
/*
152
**  SendServerID -- send our host name to who ever requested it.
153
**
154
**	Parameters:
155
**		rconn - the reply packet to be formatted.
156
**
157
**	Returns:
158
**		1 on success, 0 on failure.
159
**
160
**	Side Effects:
161
**		none.
162
*/
163
int
164
SendServerID(RMPCONN *rconn)
165
{
166
	struct rmp_packet *rpl;
167
	char *src, *dst;
168
	u_int8_t *size;
169
170
	rpl = &rconn->rmp;			/* cache ptr to RMP packet */
171
172
	/*
173
	 *  Set up assorted fields in reply packet.
174
	 */
175
	rpl->r_brpl.rmp_type = RMP_BOOT_REPL;
176
	rpl->r_brpl.rmp_retcode = RMP_E_OKAY;
177
	ZEROWORD(rpl->r_brpl.rmp_seqno);
178
	rpl->r_brpl.rmp_session = 0;
179
	rpl->r_brpl.rmp_version = htons(RMP_VERSION);
180
181
	size = &rpl->r_brpl.rmp_flnmsize;	/* ptr to length of host name */
182
183
	/*
184
	 *  Copy our host name into the reply packet incrementing the
185
	 *  length as we go.  Stop at RMP_HOSTLEN or the first dot.
186
	 */
187
	src = MyHost;
188
	dst = (char *) &rpl->r_brpl.rmp_flnm;
189
	for (*size = 0; *size < RMP_HOSTLEN; (*size)++) {
190
		if (*src == '.' || *src == '\0')
191
			break;
192
		*dst++ = *src++;
193
	}
194
195
	rconn->rmplen = RMPBOOTSIZE(*size);	/* set packet length */
196
197
	return(SendPacket(rconn));		/* send packet */
198
}
199
200
/*
201
**  SendFileNo -- send the name of a bootable file to the requester.
202
**
203
**	Parameters:
204
**		req - RMP BOOT packet containing the request.
205
**		rconn - the reply packet to be formatted.
206
**		filelist - list of files available to the requester.
207
**
208
**	Returns:
209
**		1 on success, 0 on failure.
210
**
211
**	Side Effects:
212
**		none.
213
*/
214
int
215
SendFileNo(struct rmp_packet *req, RMPCONN *rconn, char *filelist[])
216
{
217
	struct rmp_packet *rpl;
218
	char *src, *dst;
219
	u_int8_t *size;
220
	int i;
221
222
	GETWORD(req->r_brpl.rmp_seqno, i);	/* SeqNo is really FileNo */
223
	rpl = &rconn->rmp;			/* cache ptr to RMP packet */
224
225
	/*
226
	 *  Set up assorted fields in reply packet.
227
	 */
228
	rpl->r_brpl.rmp_type = RMP_BOOT_REPL;
229
	PUTWORD(i, rpl->r_brpl.rmp_seqno);
230
	i--;
231
	rpl->r_brpl.rmp_session = 0;
232
	rpl->r_brpl.rmp_version = htons(RMP_VERSION);
233
234
	size = &rpl->r_brpl.rmp_flnmsize;	/* ptr to length of filename */
235
	*size = 0;				/* init length to zero */
236
237
	/*
238
	 *  Copy the file name into the reply packet incrementing the
239
	 *  length as we go.  Stop at end of string or when RMPBOOTDATA
240
	 *  characters have been copied.  Also, set return code to
241
	 *  indicate success or "no more files".
242
	 */
243
	if (i < C_MAXFILE && filelist[i] != NULL) {
244
		src = filelist[i];
245
		dst = (char *)&rpl->r_brpl.rmp_flnm;
246
		for (; *src && *size < RMPBOOTDATA; (*size)++) {
247
			if (*src == '\0')
248
				break;
249
			*dst++ = *src++;
250
		}
251
		rpl->r_brpl.rmp_retcode = RMP_E_OKAY;
252
	} else
253
		rpl->r_brpl.rmp_retcode = RMP_E_NODFLT;
254
255
	rconn->rmplen = RMPBOOTSIZE(*size);	/* set packet length */
256
257
	return(SendPacket(rconn));		/* send packet */
258
}
259
260
/*
261
**  SendBootRepl -- open boot file and respond to boot request.
262
**
263
**	Parameters:
264
**		req - RMP BOOT packet containing the request.
265
**		rconn - the reply packet to be formatted.
266
**		filelist - list of files available to the requester.
267
**
268
**	Returns:
269
**		1 on success, 0 on failure.
270
**
271
**	Side Effects:
272
**		none.
273
*/
274
int
275
SendBootRepl(struct rmp_packet *req, RMPCONN *rconn, char *filelist[])
276
{
277
	int retval;
278
	char *filename, filepath[RMPBOOTDATA+1];
279
	RMPCONN *oldconn;
280
	struct rmp_packet *rpl;
281
	char *src, *dst1, *dst2;
282
	u_int8_t i;
283
284
	/*
285
	 *  If another connection already exists, delete it since we
286
	 *  are obviously starting again.
287
	 */
288
	if ((oldconn = FindConn(rconn)) != NULL) {
289
		syslog(LOG_WARNING, "%s: dropping existing connection",
290
		    EnetStr(oldconn));
291
		RemoveConn(oldconn);
292
	}
293
294
	rpl = &rconn->rmp;			/* cache ptr to RMP packet */
295
296
	/*
297
	 *  Set up assorted fields in reply packet.
298
	 */
299
	rpl->r_brpl.rmp_type = RMP_BOOT_REPL;
300
	COPYWORD(req->r_brq.rmp_seqno, rpl->r_brpl.rmp_seqno);
301
	rpl->r_brpl.rmp_session = htons(GenSessID());
302
	rpl->r_brpl.rmp_version = htons(RMP_VERSION);
303
	rpl->r_brpl.rmp_flnmsize = req->r_brq.rmp_flnmsize;
304
305
	/*
306
	 *  Copy file name to `filepath' string, and into reply packet.
307
	 */
308
	dst1 = filepath;
309
	dst2 = &rpl->r_brpl.rmp_flnm;
310
	if (req->r_brq.rmp_flnmsize)
311
		src = &req->r_brq.rmp_flnm;
312
	else {
313
		/* no file supplied, substitute the first one */
314
		src = filelist[0];
315
		req->r_brq.rmp_flnmsize = strlen(src);
316
	}
317
	for (i = 0; i < req->r_brq.rmp_flnmsize; i++)
318
		*dst1++ = *dst2++ = *src++;
319
	*dst1 = '\0';
320
321
	/*
322
	 *  If we are booting HP-UX machines, their secondary loader will
323
	 *  ask for files like "/hp-ux".  As a security measure, we do not
324
	 *  allow boot files to lay outside the boot directory (unless they
325
	 *  are purposely link'd out.  So, make `filename' become the path-
326
	 *  stripped file name and spoof the client into thinking that it
327
	 *  really got what it wanted.
328
	 */
329
	if ((filename = strrchr(filepath,'/')) != NULL)
330
		filename++;
331
	else
332
		filename = filepath;
333
334
	/*
335
	 *  Check that this is a valid boot file name.
336
	 */
337
	for (i = 0; i < C_MAXFILE && filelist[i] != NULL; i++)
338
		if (STREQN(filename, filelist[i]))
339
			goto match;
340
341
	/*
342
	 *  Invalid boot file name, set error and send reply packet.
343
	 */
344
	rpl->r_brpl.rmp_retcode = RMP_E_NOFILE;
345
	retval = 0;
346
	goto sendpkt;
347
348
match:
349
	/*
350
	 *  This is a valid boot file.  Open the file and save the file
351
	 *  descriptor associated with this connection and set success
352
	 *  indication.  If the file couldnt be opened, set error:
353
	 *  	"no such file or dir" - RMP_E_NOFILE
354
	 *	"file table overflow" - RMP_E_BUSY
355
	 *	"too many open files" - RMP_E_BUSY
356
	 *	anything else         - RMP_E_OPENFILE
357
	 */
358
	if ((rconn->bootfd = open(filename, O_RDONLY, 0600)) < 0) {
359
		rpl->r_brpl.rmp_retcode = (errno == ENOENT)? RMP_E_NOFILE:
360
			(errno == EMFILE || errno == ENFILE)? RMP_E_BUSY:
361
			RMP_E_OPENFILE;
362
		retval = 0;
363
	} else {
364
		rpl->r_brpl.rmp_retcode = RMP_E_OKAY;
365
		retval = 1;
366
	}
367
368
sendpkt:
369
	syslog(LOG_INFO, "%s: request to boot %s (%s)",
370
	    EnetStr(rconn), filename, retval? "granted": "denied");
371
372
	rconn->rmplen = RMPBOOTSIZE(rpl->r_brpl.rmp_flnmsize);
373
374
	return (retval & SendPacket(rconn));
375
}
376
377
/*
378
**  SendReadRepl -- send a portion of the boot file to the requester.
379
**
380
**	Parameters:
381
**		rconn - the reply packet to be formatted.
382
**
383
**	Returns:
384
**		1 on success, 0 on failure.
385
**
386
**	Side Effects:
387
**		none.
388
*/
389
int
390
SendReadRepl(RMPCONN *rconn)
391
{
392
	int retval = 0;
393
	RMPCONN *oldconn;
394
	struct rmp_packet *rpl, *req;
395
	int size = 0;
396
	int madeconn = 0;
397
398
	/*
399
	 *  Find the old connection.  If one doesnt exist, create one only
400
	 *  to return the error code.
401
	 */
402
	if ((oldconn = FindConn(rconn)) == NULL) {
403
		if ((oldconn = NewConn(rconn)) == NULL)
404
			return(0);
405
		syslog(LOG_ERR, "SendReadRepl: no active connection (%s)",
406
		    EnetStr(rconn));
407
		madeconn++;
408
	}
409
410
	req = &rconn->rmp;		/* cache ptr to request packet */
411
	rpl = &oldconn->rmp;		/* cache ptr to reply packet */
412
413
	if (madeconn) {			/* no active connection above; abort */
414
		rpl->r_rrpl.rmp_retcode = RMP_E_ABORT;
415
		retval = 1;
416
		goto sendpkt;
417
	}
418
419
	/*
420
	 *  Make sure Session ID's match.
421
	 */
422
	if (ntohs(req->r_rrq.rmp_session) !=
423
	    ((rpl->r_type == RMP_BOOT_REPL)? ntohs(rpl->r_brpl.rmp_session):
424
	    ntohs(rpl->r_rrpl.rmp_session))) {
425
		syslog(LOG_ERR, "SendReadRepl: bad session id (%s)",
426
		    EnetStr(rconn));
427
		rpl->r_rrpl.rmp_retcode = RMP_E_BADSID;
428
		retval = 1;
429
		goto sendpkt;
430
	}
431
432
	/*
433
	 *  If the requester asks for more data than we can fit,
434
	 *  silently clamp the request size down to RMPREADDATA.
435
	 *
436
	 *  N.B. I do not know if this is "legal", however it seems
437
	 *  to work.  This is necessary for bpfwrite() on machines
438
	 *  with MCLBYTES less than 1514.
439
	 */
440
	if (ntohs(req->r_rrq.rmp_size) > RMPREADDATA)
441
		req->r_rrq.rmp_size = htons(RMPREADDATA);
442
443
	/*
444
	 *  Position read head on file according to info in request packet.
445
	 */
446
	GETWORD(req->r_rrq.rmp_offset, size);
447
	if (lseek(oldconn->bootfd, (off_t)size, SEEK_SET) < 0) {
448
		syslog(LOG_ERR, "SendReadRepl: lseek: %m (%s)",
449
		    EnetStr(rconn));
450
		rpl->r_rrpl.rmp_retcode = RMP_E_ABORT;
451
		retval = 1;
452
		goto sendpkt;
453
	}
454
455
	/*
456
	 *  Read data directly into reply packet.
457
	 */
458
	if ((size = read(oldconn->bootfd, &rpl->r_rrpl.rmp_data,
459
	    (int) ntohs(req->r_rrq.rmp_size))) <= 0) {
460
		if (size < 0) {
461
			syslog(LOG_ERR, "SendReadRepl: read: %m (%s)",
462
			    EnetStr(rconn));
463
			rpl->r_rrpl.rmp_retcode = RMP_E_ABORT;
464
		} else {
465
			rpl->r_rrpl.rmp_retcode = RMP_E_EOF;
466
		}
467
		retval = 1;
468
		goto sendpkt;
469
	}
470
471
	/*
472
	 *  Set success indication.
473
	 */
474
	rpl->r_rrpl.rmp_retcode = RMP_E_OKAY;
475
476
sendpkt:
477
	/*
478
	 *  Set up assorted fields in reply packet.
479
	 */
480
	rpl->r_rrpl.rmp_type = RMP_READ_REPL;
481
	COPYWORD(req->r_rrq.rmp_offset, rpl->r_rrpl.rmp_offset);
482
	rpl->r_rrpl.rmp_session = req->r_rrq.rmp_session;
483
484
	oldconn->rmplen = RMPREADSIZE(size);	/* set size of packet */
485
486
	retval &= SendPacket(oldconn);		/* send packet */
487
488
	if (madeconn)				/* clean up after ourself */
489
		FreeConn(oldconn);
490
491
	return (retval);
492
}
493
494
/*
495
**  BootDone -- free up memory allocated for a connection.
496
**
497
**	Parameters:
498
**		rconn - incoming boot complete packet.
499
**
500
**	Returns:
501
**		1 on success, 0 on failure.
502
**
503
**	Side Effects:
504
**		none.
505
*/
506
int
507
BootDone(RMPCONN *rconn)
508
{
509
	RMPCONN *oldconn;
510
	struct rmp_packet *rpl;
511
512
	/*
513
	 *  If we cant find the connection, ignore the request.
514
	 */
515
	if ((oldconn = FindConn(rconn)) == NULL) {
516
		syslog(LOG_ERR, "BootDone: no existing connection (%s)",
517
		    EnetStr(rconn));
518
		return(0);
519
	}
520
521
	rpl = &oldconn->rmp;			/* cache ptr to RMP packet */
522
523
	/*
524
	 *  Make sure Session ID's match.
525
	 */
526
	if (ntohs(rconn->rmp.r_rrq.rmp_session) !=
527
	    ((rpl->r_type == RMP_BOOT_REPL)? ntohs(rpl->r_brpl.rmp_session):
528
	    ntohs(rpl->r_rrpl.rmp_session))) {
529
		syslog(LOG_ERR, "BootDone: bad session id (%s)",
530
		    EnetStr(rconn));
531
		return(0);
532
	}
533
534
	RemoveConn(oldconn);			/* remove connection */
535
536
	syslog(LOG_INFO, "%s: boot complete", EnetStr(rconn));
537
538
	return(1);
539
}
540
541
/*
542
**  SendPacket -- send an RMP packet to a remote host.
543
**
544
**	Parameters:
545
**		rconn - packet to be sent.
546
**
547
**	Returns:
548
**		1 on success, 0 on failure.
549
**
550
**	Side Effects:
551
**		none.
552
*/
553
int
554
SendPacket(RMPCONN *rconn)
555
{
556
	/*
557
	 *  Set Ethernet Destination address to Source (BPF and the enet
558
	 *  driver will take care of getting our source address set).
559
	 */
560
	bcopy((char *)&rconn->rmp.hp_hdr.saddr[0],
561
	    (char *)&rconn->rmp.hp_hdr.daddr[0], RMP_ADDRLEN);
562
	rconn->rmp.hp_hdr.len = htons(rconn->rmplen - sizeof(struct hp_hdr));
563
564
	/*
565
	 *  Reverse 802.2/HP Extended Source & Destination Access Pts.
566
	 */
567
	rconn->rmp.hp_llc.dxsap = htons(HPEXT_SXSAP);
568
	rconn->rmp.hp_llc.sxsap = htons(HPEXT_DXSAP);
569
570
	/*
571
	 *  Last time this connection was active.
572
	 */
573
	(void) gettimeofday(&rconn->tstamp, NULL);
574
575
	if (DbgFp != NULL)			/* display packet */
576
		DispPkt(rconn,DIR_SENT);
577
578
	/*
579
	 *  Send RMP packet to remote host.
580
	 */
581
	return(BpfWrite(rconn));
582
}