xref: /illumos-gate/usr/src/common/smbios/smb_open.c (revision eb00b1c8a31c2253a353644606388dff5b0e0275) 
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2015 OmniTI Computer Consulting, Inc.  All rights reserved.
24  * Copyright 2018 Joyent, Inc.
25  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
26  * Use is subject to license terms.
27  */
28 
29 #include <sys/smbios_impl.h>
30 
31 static const uint_t _smb_hashlen = 64;		/* hash length (must be Pof2) */
32 static const char _smb_emptystr[] = "";		/* empty string to return */
33 int _smb_debug = 0;				/* default debug mode */
34 
35 /*
36  * Strip out identification information for you privacy weenies.  This is quite
37  * simple using our smbios_info_common() abstraction: we just locate any serial
38  * numbers and asset tags for each record, and then zero out those strings.
39  * Then we must handle two special cases: SMB_TYPE_SYSTEM holds a 16-byte UUID
40  * and SMB_TYPE_BATTERY stores a Smart Battery Data Spec 16-bit serial number.
41  * We use a literal '0' rather than '\0' for zeroing strings because \0\0 in
42  * the SMBIOS string table has a special meaning (denotes end-of-record).
43  */
44 static void
45 smb_strip(smbios_hdl_t *shp)
46 {
47 	uint_t i;
48 
49 	for (i = 0; i < shp->sh_nstructs; i++) {
50 		const smb_header_t *hp = shp->sh_structs[i].smbst_hdr;
51 		smbios_info_t info;
52 		char *p;
53 
54 		if (hp->smbh_type == SMB_TYPE_SYSTEM &&
55 		    hp->smbh_len >= offsetof(smb_system_t, smbsi_wakeup)) {
56 			smb_system_t *sp = (smb_system_t *)(uintptr_t)hp;
57 			bzero(sp->smbsi_uuid, sizeof (sp->smbsi_uuid));
58 		}
59 
60 		if (hp->smbh_type == SMB_TYPE_BATTERY &&
61 		    hp->smbh_len >= offsetof(smb_battery_t, smbbat_sdate)) {
62 			smb_battery_t *bp = (smb_battery_t *)(uintptr_t)hp;
63 			bp->smbbat_ssn = 0;
64 		}
65 
66 		if (smbios_info_common(shp, hp->smbh_hdl, &info) != SMB_ERR) {
67 			for (p = (char *)info.smbi_serial; *p != '\0'; p++)
68 				*p = '0';
69 			for (p = (char *)info.smbi_asset; *p != '\0'; p++)
70 				*p = '0';
71 		}
72 	}
73 }
74 
75 static int
76 smbios_bufopen_21(smbios_hdl_t *shp, const smbios_21_entry_t *ep, size_t len,
77     int flags)
78 {
79 	if (strncmp(ep->smbe_eanchor, SMB_ENTRY_EANCHOR, SMB_ENTRY_EANCHORLEN))
80 		return (ESMB_HEADER);
81 
82 	if (strncmp(ep->smbe_ianchor, SMB_ENTRY_IANCHOR, SMB_ENTRY_IANCHORLEN))
83 		return (ESMB_HEADER);
84 
85 	smb_dprintf(shp, "opening SMBIOS version %u.%u bcdrev 0x%x\n",
86 	    ep->smbe_major, ep->smbe_minor, ep->smbe_bcdrev);
87 
88 	if (!(flags & SMB_O_NOVERS)) {
89 		if (ep->smbe_major > SMB_MAJOR(SMB_VERSION))
90 			return (ESMB_NEW);
91 
92 		if (ep->smbe_major < SMB_MAJOR(SMB_VERSION_23) || (
93 		    ep->smbe_major == SMB_MAJOR(SMB_VERSION_23) &&
94 		    ep->smbe_minor < SMB_MINOR(SMB_VERSION_23)))
95 			return (ESMB_OLD);
96 	}
97 
98 	if (len < sizeof (smb_header_t) ||
99 	    ep->smbe_stlen < sizeof (smb_header_t) || len < ep->smbe_stlen)
100 		return (ESMB_SHORT);
101 
102 	if (!(flags & SMB_O_NOCKSUM)) {
103 		uint8_t esum = 0, isum = 0;
104 		const uchar_t *p, *q;
105 		q = (uchar_t *)ep;
106 
107 		for (p = q; p < q + ep->smbe_elen; p++)
108 			esum += *p;
109 
110 		for (p = (uchar_t *)ep->smbe_ianchor; p < q + sizeof (*ep); p++)
111 			isum += *p;
112 
113 		if (esum != 0 || isum != 0) {
114 			smb_dprintf(shp, "bad cksum: e=%x i=%x\n", esum, isum);
115 			return (ESMB_CKSUM);
116 		}
117 	}
118 
119 	/*
120 	 * Copy the entry point into our handle.  The underlying entry point
121 	 * may be larger than our structure definition, so reset smbe_elen
122 	 * to our internal size and recompute good checksums for our copy.
123 	 */
124 	shp->sh_ent_type = SMBIOS_ENTRY_POINT_21;
125 	bcopy(ep, &shp->sh_ent, sizeof (smbios_entry_t));
126 	shp->sh_ent.ep21.smbe_elen = sizeof (smbios_entry_t);
127 	smbios_checksum(shp, &shp->sh_ent);
128 
129 	shp->sh_ent_stnum = ep->smbe_stnum;
130 	shp->sh_smbvers = SMB_MAJMIN(ep->smbe_major, ep->smbe_minor);
131 	return (0);
132 }
133 
134 static int
135 smbios_bufopen_30(smbios_hdl_t *shp, const smbios_30_entry_t *ep, size_t len,
136     int flags)
137 {
138 	if (strncmp(ep->smbe_eanchor, SMB3_ENTRY_EANCHOR,
139 	    SMB3_ENTRY_EANCHORLEN))
140 		return (ESMB_HEADER);
141 
142 	smb_dprintf(shp, "opening SMBIOS version %u.%u\n",
143 	    ep->smbe_major, ep->smbe_minor);
144 
145 	if (!(flags & SMB_O_NOVERS)) {
146 		if (ep->smbe_major > SMB_MAJOR(SMB_VERSION))
147 			return (ESMB_NEW);
148 
149 		if (ep->smbe_major < SMB_MAJOR(SMB_VERSION_23) || (
150 		    ep->smbe_major == SMB_MAJOR(SMB_VERSION_23) &&
151 		    ep->smbe_minor < SMB_MINOR(SMB_VERSION_23)))
152 			return (ESMB_OLD);
153 	}
154 
155 	if (len < sizeof (smb_header_t) ||
156 	    ep->smbe_stlen < sizeof (smb_header_t) || len < ep->smbe_stlen)
157 		return (ESMB_SHORT);
158 
159 	if (!(flags & SMB_O_NOCKSUM)) {
160 		uint8_t esum = 0;
161 		const uchar_t *p, *q;
162 		q = (uchar_t *)ep;
163 
164 		for (p = q; p < q + ep->smbe_elen; p++)
165 			esum += *p;
166 
167 		if (esum != 0) {
168 			smb_dprintf(shp, "bad cksum: e=%x\n", esum);
169 			return (ESMB_CKSUM);
170 		}
171 	}
172 
173 	/*
174 	 * Copy the entry point into our handle.  The underlying entry point
175 	 * may be larger than our structure definition, so reset smbe_elen
176 	 * to our internal size and recompute good checksums for our copy.
177 	 */
178 	shp->sh_ent_type = SMBIOS_ENTRY_POINT_30;
179 	bcopy(ep, &shp->sh_ent, sizeof (smbios_entry_t));
180 	shp->sh_ent.ep30.smbe_elen = sizeof (smbios_entry_t);
181 	smbios_checksum(shp, &shp->sh_ent);
182 
183 	shp->sh_smbvers = SMB_MAJMIN(ep->smbe_major, ep->smbe_minor);
184 
185 	return (0);
186 }
187 
188 static uint_t
189 smbios_table_nentries(const char *smbe_staddr, uint32_t smbe_stlen)
190 {
191 	uint_t i = 0;
192 	char *dmi;
193 	smb_header_t *hdr;
194 
195 	if (smbe_staddr == NULL)
196 		return (i);
197 
198 	for (dmi = (char *)smbe_staddr; dmi < smbe_staddr + smbe_stlen; i++) {
199 		hdr = (smb_header_t *)dmi;
200 		dmi += hdr->smbh_len;
201 		/*
202 		 * Search for the end of the string area.
203 		 */
204 		while (dmi + 1 < smbe_staddr + smbe_stlen &&
205 		    dmi[0] != '\0' && dmi[1] != '\0') {
206 			dmi++;
207 		}
208 		dmi += 2;
209 	}
210 	return (i);
211 }
212 
213 smbios_hdl_t *
214 smbios_bufopen(const smbios_entry_t *ep, const void *buf, size_t len,
215     int version, int flags, int *errp)
216 {
217 	smbios_hdl_t *shp = smb_zalloc(sizeof (smbios_hdl_t));
218 	const smb_header_t *hp, *nhp;
219 	const uchar_t *p, *q, *s;
220 	uint_t i, h;
221 	int err;
222 
223 	switch (version) {
224 	case SMB_VERSION_23:
225 	case SMB_VERSION_24:
226 	case SMB_VERSION_25:
227 	case SMB_VERSION_26:
228 	case SMB_VERSION_27:
229 	case SMB_VERSION_28:
230 	case SMB_VERSION_30:
231 	case SMB_VERSION_31:
232 	case SMB_VERSION_32:
233 	case SMB_VERSION_33:
234 		break;
235 	default:
236 		return (smb_open_error(shp, errp, ESMB_VERSION));
237 	}
238 
239 	if (ep == NULL || buf == NULL || len == 0 || (flags & ~SMB_O_MASK))
240 		return (smb_open_error(shp, errp, ESMB_INVAL));
241 
242 	if (shp == NULL)
243 		return (smb_open_error(shp, errp, ESMB_NOMEM));
244 
245 	if (_smb_debug)
246 		shp->sh_flags |= SMB_FL_DEBUG;
247 
248 	err = smbios_bufopen_21(shp, &ep->ep21, len, flags);
249 	if (err != 0) {
250 		err = smbios_bufopen_30(shp, &ep->ep30, len, flags);
251 		if (err != 0)
252 			return (smb_open_error(shp, errp, err));
253 		shp->sh_ent_stnum =
254 		    smbios_table_nentries(buf, ep->ep30.smbe_stlen);
255 	}
256 
257 	shp->sh_buf = buf;
258 	shp->sh_buflen = len;
259 	shp->sh_structs = smb_alloc(sizeof (smb_struct_t) * shp->sh_ent_stnum);
260 	shp->sh_nstructs = 0;
261 	shp->sh_hashlen = _smb_hashlen;
262 	shp->sh_hash = smb_zalloc(sizeof (smb_struct_t *) * shp->sh_hashlen);
263 	shp->sh_libvers = version;
264 
265 	if (shp->sh_structs == NULL || shp->sh_hash == NULL)
266 		return (smb_open_error(shp, errp, ESMB_NOMEM));
267 
268 	hp = shp->sh_buf;
269 	switch (shp->sh_ent_type) {
270 	case SMBIOS_ENTRY_POINT_21:
271 		q = (const uchar_t *)buf + MIN(ep->ep21.smbe_stlen, len);
272 		break;
273 	case SMBIOS_ENTRY_POINT_30:
274 		q = (const uchar_t *)buf + MIN(ep->ep30.smbe_stlen, len);
275 		break;
276 	default:
277 		return (smb_open_error(shp, errp, ESMB_VERSION));
278 	}
279 
280 	for (i = 0; i < shp->sh_ent_stnum; i++, hp = nhp) {
281 		smb_struct_t *stp = &shp->sh_structs[i];
282 		uint_t n = 0;
283 
284 		if ((const uchar_t *)hp + sizeof (smb_header_t) > q) {
285 			shp->sh_flags |= SMB_FL_TRUNC;
286 			break;
287 		}
288 
289 		smb_dprintf(shp, "struct [%u] type %u len %u hdl %u at %p\n",
290 		    i, hp->smbh_type, hp->smbh_len, hp->smbh_hdl, (void *)hp);
291 
292 		if (hp->smbh_type == SMB_TYPE_EOT)
293 			break; /* ignore any entries beyond end-of-table */
294 
295 		if ((const uchar_t *)hp + hp->smbh_len > q - 2) {
296 			shp->sh_flags |= SMB_FL_TRUNC;
297 			break;
298 		}
299 
300 		h = hp->smbh_hdl & (shp->sh_hashlen - 1);
301 		p = s = (const uchar_t *)hp + hp->smbh_len;
302 
303 		while (p <= q - 2 && (p[0] != '\0' || p[1] != '\0')) {
304 			if (*p++ == '\0')
305 				n++; /* count strings until \0\0 delimiter */
306 		}
307 
308 		if (p > q - 2) {
309 			shp->sh_flags |= SMB_FL_TRUNC;
310 			break;
311 		}
312 
313 		if (p > s)
314 			n++; /* add one for final string in string table */
315 
316 		stp->smbst_hdr = hp;
317 		stp->smbst_str = s;
318 		stp->smbst_end = p;
319 		stp->smbst_next = shp->sh_hash[h];
320 		stp->smbst_strtab = smb_alloc(sizeof (uint16_t) * n);
321 		stp->smbst_strtablen = n;
322 
323 		if (n != 0 && stp->smbst_strtab == NULL)
324 			return (smb_open_error(shp, errp, ESMB_NOMEM));
325 
326 		shp->sh_hash[h] = stp;
327 		nhp = (void *)(p + 2);
328 		shp->sh_nstructs++;
329 
330 		for (n = 0, p = s; n < stp->smbst_strtablen; p++) {
331 			if (*p == '\0') {
332 				stp->smbst_strtab[n++] =
333 				    (uint16_t)(s - stp->smbst_str);
334 				s = p + 1;
335 			}
336 		}
337 	}
338 
339 	/* error out if we couldn't find any complete entries in the table */
340 	if ((shp->sh_flags & SMB_FL_TRUNC) && i == 0)
341 		return (smb_open_error(shp, errp, ESMB_CORRUPT));
342 
343 	if (flags & SMB_O_ZIDS)
344 		smb_strip(shp);
345 
346 	return (shp);
347 }
348 
349 void
350 smbios_close(smbios_hdl_t *shp)
351 {
352 	uint_t i;
353 
354 	for (i = 0; i < shp->sh_nstructs; i++) {
355 		smb_free(shp->sh_structs[i].smbst_strtab,
356 		    sizeof (uint16_t) * shp->sh_structs[i].smbst_strtablen);
357 	}
358 
359 	smb_free(shp->sh_structs, sizeof (smb_struct_t) * shp->sh_ent_stnum);
360 	smb_free(shp->sh_hash, sizeof (smb_struct_t *) * shp->sh_hashlen);
361 
362 	if (shp->sh_flags & SMB_FL_BUFALLOC)
363 		smb_free((void *)shp->sh_buf, shp->sh_buflen);
364 
365 	smb_free(shp, sizeof (smbios_hdl_t));
366 }
367 
368 /*
369  * Recompute the values of the entry point checksums based upon the content
370  * of the specified SMBIOS entry point.  We don't need 'shp' but require it
371  * anyway in case future versioning requires variations in the algorithm.
372  */
373 /*ARGSUSED*/
374 void
375 smbios_checksum(smbios_hdl_t *shp, smbios_entry_t *ep)
376 {
377 	uchar_t *p, *q = (uchar_t *)ep;
378 	uint8_t esum = 0, isum = 0;
379 
380 	switch (shp->sh_ent_type) {
381 	case SMBIOS_ENTRY_POINT_21:
382 		ep->ep21.smbe_ecksum = ep->ep21.smbe_icksum = 0;
383 
384 		for (p = (uchar_t *)ep->ep21.smbe_ianchor;
385 		    p < q + sizeof (*ep); p++) {
386 			isum += *p;
387 		}
388 
389 		ep->ep21.smbe_icksum = -isum;
390 
391 		for (p = q; p < q + ep->ep21.smbe_elen; p++)
392 			esum += *p;
393 
394 		ep->ep21.smbe_ecksum = -esum;
395 		break;
396 	case SMBIOS_ENTRY_POINT_30:
397 		ep->ep30.smbe_ecksum = 0;
398 		for (p = q; p < q + ep->ep30.smbe_elen; p++)
399 			esum += *p;
400 
401 		ep->ep30.smbe_ecksum = -esum;
402 		break;
403 	default:
404 		break;
405 	}
406 }
407 
408 const void *
409 smbios_buf(smbios_hdl_t *shp)
410 {
411 	return (shp->sh_buf);
412 }
413 
414 size_t
415 smbios_buflen(smbios_hdl_t *shp)
416 {
417 	return (shp->sh_buflen);
418 }
419 
420 static smbios_struct_t *
421 smb_export(const smb_struct_t *stp, smbios_struct_t *sp)
422 {
423 	const smb_header_t *hdr = stp->smbst_hdr;
424 
425 	sp->smbstr_id = hdr->smbh_hdl;
426 	sp->smbstr_type = hdr->smbh_type;
427 	sp->smbstr_data = hdr;
428 	sp->smbstr_size = (size_t)(stp->smbst_end - (uchar_t *)hdr);
429 
430 	return (sp);
431 }
432 
433 int
434 smbios_lookup_id(smbios_hdl_t *shp, id_t id, smbios_struct_t *sp)
435 {
436 	const smb_struct_t *stp = smb_lookup_id(shp, id);
437 
438 	if (stp == NULL)
439 		return (-1); /* errno is set for us */
440 
441 	if (sp != NULL)
442 		(void) smb_export(stp, sp);
443 
444 	return (0);
445 }
446 
447 int
448 smbios_lookup_type(smbios_hdl_t *shp, uint_t type, smbios_struct_t *sp)
449 {
450 	const smb_struct_t *stp = smb_lookup_type(shp, type);
451 
452 	if (stp == NULL)
453 		return (-1); /* errno is set for us */
454 
455 	if (sp != NULL)
456 		(void) smb_export(stp, sp);
457 
458 	return (0);
459 }
460 
461 int
462 smbios_iter(smbios_hdl_t *shp, smbios_struct_f *func, void *data)
463 {
464 	const smb_struct_t *sp = shp->sh_structs;
465 	smbios_struct_t s;
466 	int i, rv = 0;
467 
468 	for (i = 0; i < shp->sh_nstructs; i++, sp++) {
469 		if (sp->smbst_hdr->smbh_type != SMB_TYPE_INACTIVE &&
470 		    (rv = func(shp, smb_export(sp, &s), data)) != 0)
471 			break;
472 	}
473 
474 	return (rv);
475 }
476 
477 const smb_struct_t *
478 smb_lookup_type(smbios_hdl_t *shp, uint_t type)
479 {
480 	uint_t i;
481 
482 	for (i = 0; i < shp->sh_nstructs; i++) {
483 		if (shp->sh_structs[i].smbst_hdr->smbh_type == type)
484 			return (&shp->sh_structs[i]);
485 	}
486 
487 	(void) smb_set_errno(shp, ESMB_NOENT);
488 	return (NULL);
489 }
490 
491 const smb_struct_t *
492 smb_lookup_id(smbios_hdl_t *shp, uint_t id)
493 {
494 	const smb_struct_t *stp = shp->sh_hash[id & (shp->sh_hashlen - 1)];
495 
496 	switch (id) {
497 	case SMB_ID_NOTSUP:
498 		(void) smb_set_errno(shp, ESMB_NOTSUP);
499 		return (NULL);
500 	case SMB_ID_NONE:
501 		(void) smb_set_errno(shp, ESMB_NOENT);
502 		return (NULL);
503 	}
504 
505 	for (; stp != NULL; stp = stp->smbst_next) {
506 		if (stp->smbst_hdr->smbh_hdl == id)
507 			break;
508 	}
509 
510 	if (stp == NULL)
511 		(void) smb_set_errno(shp, ESMB_NOENT);
512 
513 	return (stp);
514 }
515 
516 const char *
517 smb_strptr(const smb_struct_t *stp, uint_t i)
518 {
519 	if (i == 0 || i > stp->smbst_strtablen)
520 		return (_smb_emptystr);
521 	else
522 		return ((char *)stp->smbst_str + stp->smbst_strtab[i - 1]);
523 }
524 
525 int
526 smb_libgteq(smbios_hdl_t *shp, int version)
527 {
528 	return (SMB_MAJOR(shp->sh_libvers) > SMB_MAJOR(version) || (
529 	    SMB_MAJOR(shp->sh_libvers) == SMB_MAJOR(version) &&
530 	    SMB_MINOR(shp->sh_libvers) >= SMB_MINOR(version)));
531 }
532 
533 int
534 smb_gteq(smbios_hdl_t *shp, int version)
535 {
536 	return (SMB_MAJOR(shp->sh_smbvers) > SMB_MAJOR(version) || (
537 	    SMB_MAJOR(shp->sh_smbvers) == SMB_MAJOR(version) &&
538 	    SMB_MINOR(shp->sh_smbvers) >= SMB_MINOR(version)));
539 }
540 
541 boolean_t
542 smbios_truncated(smbios_hdl_t *shp)
543 {
544 	return ((shp->sh_flags & SMB_FL_TRUNC) != 0);
545 }
546