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 2023 Oxide Computer Company
26 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
27 * Use is subject to license terms.
28 */
29
30 #include <sys/smbios_impl.h>
31
32 static const uint_t _smb_hashlen = 64; /* hash length (must be Pof2) */
33 static const char _smb_emptystr[] = ""; /* empty string to return */
34 int _smb_debug = 0; /* default debug mode */
35
36 /*
37 * Strip out identification information for you privacy weenies. This is quite
38 * simple using our smbios_info_common() abstraction: we just locate any serial
39 * numbers and asset tags for each record, and then zero out those strings.
40 * Then we must handle two special cases: SMB_TYPE_SYSTEM holds a 16-byte UUID
41 * and SMB_TYPE_BATTERY stores a Smart Battery Data Spec 16-bit serial number.
42 * We use a literal '0' rather than '\0' for zeroing strings because \0\0 in
43 * the SMBIOS string table has a special meaning (denotes end-of-record).
44 */
45 static void
smb_strip(smbios_hdl_t * shp)46 smb_strip(smbios_hdl_t *shp)
47 {
48 uint_t i;
49
50 for (i = 0; i < shp->sh_nstructs; i++) {
51 const smb_header_t *hp = shp->sh_structs[i].smbst_hdr;
52 smbios_info_t info;
53 char *p;
54
55 if (hp->smbh_type == SMB_TYPE_SYSTEM &&
56 hp->smbh_len >= offsetof(smb_system_t, smbsi_wakeup)) {
57 smb_system_t *sp = (smb_system_t *)(uintptr_t)hp;
58 bzero(sp->smbsi_uuid, sizeof (sp->smbsi_uuid));
59 }
60
61 if (hp->smbh_type == SMB_TYPE_BATTERY &&
62 hp->smbh_len >= offsetof(smb_battery_t, smbbat_sdate)) {
63 smb_battery_t *bp = (smb_battery_t *)(uintptr_t)hp;
64 bp->smbbat_ssn = 0;
65 }
66
67 if (smbios_info_common(shp, hp->smbh_hdl, &info) != SMB_ERR) {
68 for (p = (char *)info.smbi_serial; *p != '\0'; p++)
69 *p = '0';
70 for (p = (char *)info.smbi_asset; *p != '\0'; p++)
71 *p = '0';
72 }
73 }
74 }
75
76 static int
smbios_bufopen_21(smbios_hdl_t * shp,const smbios_21_entry_t * ep,size_t len,int flags)77 smbios_bufopen_21(smbios_hdl_t *shp, const smbios_21_entry_t *ep, size_t len,
78 int flags)
79 {
80 if (strncmp(ep->smbe_eanchor, SMB_ENTRY_EANCHOR, SMB_ENTRY_EANCHORLEN))
81 return (ESMB_HEADER);
82
83 if (strncmp(ep->smbe_ianchor, SMB_ENTRY_IANCHOR, SMB_ENTRY_IANCHORLEN))
84 return (ESMB_HEADER);
85
86 smb_dprintf(shp, "opening SMBIOS version %u.%u bcdrev 0x%x\n",
87 ep->smbe_major, ep->smbe_minor, ep->smbe_bcdrev);
88
89 if (!(flags & SMB_O_NOVERS)) {
90 if (ep->smbe_major > SMB_MAJOR(SMB_VERSION))
91 return (ESMB_NEW);
92
93 if (ep->smbe_major < SMB_MAJOR(SMB_VERSION_23) || (
94 ep->smbe_major == SMB_MAJOR(SMB_VERSION_23) &&
95 ep->smbe_minor < SMB_MINOR(SMB_VERSION_23)))
96 return (ESMB_OLD);
97 }
98
99 if (len < sizeof (smb_header_t) ||
100 ep->smbe_stlen < sizeof (smb_header_t) || len < ep->smbe_stlen)
101 return (ESMB_SHORT);
102
103 if (!(flags & SMB_O_NOCKSUM)) {
104 uint8_t esum = 0, isum = 0;
105 const uchar_t *p, *q;
106 q = (uchar_t *)ep;
107
108 for (p = q; p < q + ep->smbe_elen; p++)
109 esum += *p;
110
111 for (p = (uchar_t *)ep->smbe_ianchor; p < q + sizeof (*ep); p++)
112 isum += *p;
113
114 if (esum != 0 || isum != 0) {
115 smb_dprintf(shp, "bad cksum: e=%x i=%x\n", esum, isum);
116 return (ESMB_CKSUM);
117 }
118 }
119
120 /*
121 * Copy the entry point into our handle. The underlying entry point
122 * may be larger than our structure definition, so reset smbe_elen
123 * to our internal size and recompute good checksums for our copy.
124 */
125 shp->sh_ent_type = SMBIOS_ENTRY_POINT_21;
126 bcopy(ep, &shp->sh_ent, sizeof (smbios_entry_t));
127 shp->sh_ent.ep21.smbe_elen = sizeof (smbios_entry_t);
128 smbios_checksum(shp, &shp->sh_ent);
129
130 shp->sh_ent_stnum = ep->smbe_stnum;
131 shp->sh_smbvers = SMB_MAJMIN(ep->smbe_major, ep->smbe_minor);
132 return (0);
133 }
134
135 static int
smbios_bufopen_30(smbios_hdl_t * shp,const smbios_30_entry_t * ep,size_t len,int flags)136 smbios_bufopen_30(smbios_hdl_t *shp, const smbios_30_entry_t *ep, size_t len,
137 int flags)
138 {
139 if (strncmp(ep->smbe_eanchor, SMB3_ENTRY_EANCHOR,
140 SMB3_ENTRY_EANCHORLEN))
141 return (ESMB_HEADER);
142
143 smb_dprintf(shp, "opening SMBIOS version %u.%u\n",
144 ep->smbe_major, ep->smbe_minor);
145
146 if (!(flags & SMB_O_NOVERS)) {
147 if (ep->smbe_major > SMB_MAJOR(SMB_VERSION))
148 return (ESMB_NEW);
149
150 if (ep->smbe_major < SMB_MAJOR(SMB_VERSION_23) || (
151 ep->smbe_major == SMB_MAJOR(SMB_VERSION_23) &&
152 ep->smbe_minor < SMB_MINOR(SMB_VERSION_23)))
153 return (ESMB_OLD);
154 }
155
156 if (len < sizeof (smb_header_t) ||
157 ep->smbe_stlen < sizeof (smb_header_t) || len < ep->smbe_stlen)
158 return (ESMB_SHORT);
159
160 if (!(flags & SMB_O_NOCKSUM)) {
161 uint8_t esum = 0;
162 const uchar_t *p, *q;
163 q = (uchar_t *)ep;
164
165 for (p = q; p < q + ep->smbe_elen; p++)
166 esum += *p;
167
168 if (esum != 0) {
169 smb_dprintf(shp, "bad cksum: e=%x\n", esum);
170 return (ESMB_CKSUM);
171 }
172 }
173
174 /*
175 * Copy the entry point into our handle. The underlying entry point
176 * may be larger than our structure definition, so reset smbe_elen
177 * to our internal size and recompute good checksums for our copy.
178 */
179 shp->sh_ent_type = SMBIOS_ENTRY_POINT_30;
180 bcopy(ep, &shp->sh_ent, sizeof (smbios_entry_t));
181 shp->sh_ent.ep30.smbe_elen = sizeof (smbios_entry_t);
182 smbios_checksum(shp, &shp->sh_ent);
183
184 shp->sh_smbvers = SMB_MAJMIN(ep->smbe_major, ep->smbe_minor);
185
186 return (0);
187 }
188
189 static uint_t
smbios_table_nentries(const char * smbe_staddr,uint32_t smbe_stlen)190 smbios_table_nentries(const char *smbe_staddr, uint32_t smbe_stlen)
191 {
192 uint_t i = 0;
193 char *dmi;
194 smb_header_t *hdr;
195
196 if (smbe_staddr == NULL)
197 return (i);
198
199 for (dmi = (char *)smbe_staddr; dmi < smbe_staddr + smbe_stlen; i++) {
200 hdr = (smb_header_t *)dmi;
201 dmi += hdr->smbh_len;
202 /*
203 * Search for the end of the string area.
204 */
205 while (dmi + 1 < smbe_staddr + smbe_stlen &&
206 dmi[0] != '\0' && dmi[1] != '\0') {
207 dmi++;
208 }
209 dmi += 2;
210 }
211 return (i);
212 }
213
214 smbios_hdl_t *
smbios_bufopen(const smbios_entry_t * ep,const void * buf,size_t len,int version,int flags,int * errp)215 smbios_bufopen(const smbios_entry_t *ep, const void *buf, size_t len,
216 int version, int flags, int *errp)
217 {
218 smbios_hdl_t *shp = smb_zalloc(sizeof (smbios_hdl_t));
219 const smb_header_t *hp, *nhp;
220 const uchar_t *p, *q, *s;
221 uint_t i, h;
222 int err;
223
224 switch (version) {
225 case SMB_VERSION_23:
226 case SMB_VERSION_24:
227 case SMB_VERSION_25:
228 case SMB_VERSION_26:
229 case SMB_VERSION_27:
230 case SMB_VERSION_28:
231 case SMB_VERSION_30:
232 case SMB_VERSION_31:
233 case SMB_VERSION_32:
234 case SMB_VERSION_33:
235 case SMB_VERSION_34:
236 case SMB_VERSION_35:
237 case SMB_VERSION_36:
238 case SMB_VERSION_37:
239 break;
240 default:
241 return (smb_open_error(shp, errp, ESMB_VERSION));
242 }
243
244 if (ep == NULL || buf == NULL || len == 0 || (flags & ~SMB_O_MASK))
245 return (smb_open_error(shp, errp, ESMB_INVAL));
246
247 if (shp == NULL)
248 return (smb_open_error(shp, errp, ESMB_NOMEM));
249
250 if (_smb_debug)
251 shp->sh_flags |= SMB_FL_DEBUG;
252
253 err = smbios_bufopen_21(shp, &ep->ep21, len, flags);
254 if (err != 0) {
255 err = smbios_bufopen_30(shp, &ep->ep30, len, flags);
256 if (err != 0)
257 return (smb_open_error(shp, errp, err));
258 shp->sh_ent_stnum =
259 smbios_table_nentries(buf, ep->ep30.smbe_stlen);
260 }
261
262 shp->sh_buf = buf;
263 shp->sh_buflen = len;
264 shp->sh_structs = smb_alloc(sizeof (smb_struct_t) * shp->sh_ent_stnum);
265 shp->sh_nstructs = 0;
266 shp->sh_hashlen = _smb_hashlen;
267 shp->sh_hash = smb_zalloc(sizeof (smb_struct_t *) * shp->sh_hashlen);
268 shp->sh_libvers = version;
269
270 if (shp->sh_structs == NULL || shp->sh_hash == NULL)
271 return (smb_open_error(shp, errp, ESMB_NOMEM));
272
273 hp = shp->sh_buf;
274 switch (shp->sh_ent_type) {
275 case SMBIOS_ENTRY_POINT_21:
276 q = (const uchar_t *)buf + MIN(ep->ep21.smbe_stlen, len);
277 break;
278 case SMBIOS_ENTRY_POINT_30:
279 q = (const uchar_t *)buf + MIN(ep->ep30.smbe_stlen, len);
280 break;
281 default:
282 return (smb_open_error(shp, errp, ESMB_VERSION));
283 }
284
285 for (i = 0; i < shp->sh_ent_stnum; i++, hp = nhp) {
286 smb_struct_t *stp = &shp->sh_structs[i];
287 uint_t n = 0;
288
289 if ((const uchar_t *)hp + sizeof (smb_header_t) > q) {
290 shp->sh_flags |= SMB_FL_TRUNC;
291 break;
292 }
293
294 smb_dprintf(shp, "struct [%u] type %u len %u hdl %u at %p\n",
295 i, hp->smbh_type, hp->smbh_len, hp->smbh_hdl, (void *)hp);
296
297 if (hp->smbh_type == SMB_TYPE_EOT)
298 break; /* ignore any entries beyond end-of-table */
299
300 if ((const uchar_t *)hp + hp->smbh_len > q - 2) {
301 shp->sh_flags |= SMB_FL_TRUNC;
302 break;
303 }
304
305 h = hp->smbh_hdl & (shp->sh_hashlen - 1);
306 p = s = (const uchar_t *)hp + hp->smbh_len;
307
308 while (p <= q - 2 && (p[0] != '\0' || p[1] != '\0')) {
309 if (*p++ == '\0')
310 n++; /* count strings until \0\0 delimiter */
311 }
312
313 if (p > q - 2) {
314 shp->sh_flags |= SMB_FL_TRUNC;
315 break;
316 }
317
318 if (p > s)
319 n++; /* add one for final string in string table */
320
321 stp->smbst_hdr = hp;
322 stp->smbst_str = s;
323 stp->smbst_end = p;
324 stp->smbst_next = shp->sh_hash[h];
325 stp->smbst_strtab = smb_alloc(sizeof (uint16_t) * n);
326 stp->smbst_strtablen = n;
327
328 if (n != 0 && stp->smbst_strtab == NULL)
329 return (smb_open_error(shp, errp, ESMB_NOMEM));
330
331 shp->sh_hash[h] = stp;
332 nhp = (void *)(p + 2);
333 shp->sh_nstructs++;
334
335 for (n = 0, p = s; n < stp->smbst_strtablen; p++) {
336 if (*p == '\0') {
337 stp->smbst_strtab[n++] =
338 (uint16_t)(s - stp->smbst_str);
339 s = p + 1;
340 }
341 }
342 }
343
344 /* error out if we couldn't find any complete entries in the table */
345 if ((shp->sh_flags & SMB_FL_TRUNC) && i == 0)
346 return (smb_open_error(shp, errp, ESMB_CORRUPT));
347
348 if (flags & SMB_O_ZIDS)
349 smb_strip(shp);
350
351 return (shp);
352 }
353
354 void
smbios_close(smbios_hdl_t * shp)355 smbios_close(smbios_hdl_t *shp)
356 {
357 uint_t i;
358
359 for (i = 0; i < shp->sh_nstructs; i++) {
360 smb_free(shp->sh_structs[i].smbst_strtab,
361 sizeof (uint16_t) * shp->sh_structs[i].smbst_strtablen);
362 }
363
364 smb_free(shp->sh_structs, sizeof (smb_struct_t) * shp->sh_ent_stnum);
365 smb_free(shp->sh_hash, sizeof (smb_struct_t *) * shp->sh_hashlen);
366
367 if (shp->sh_flags & SMB_FL_BUFALLOC)
368 smb_free((void *)shp->sh_buf, shp->sh_buflen);
369
370 smb_free(shp, sizeof (smbios_hdl_t));
371 }
372
373 /*
374 * Recompute the values of the entry point checksums based upon the content
375 * of the specified SMBIOS entry point. We don't need 'shp' but require it
376 * anyway in case future versioning requires variations in the algorithm.
377 */
378 /*ARGSUSED*/
379 void
smbios_checksum(smbios_hdl_t * shp,smbios_entry_t * ep)380 smbios_checksum(smbios_hdl_t *shp, smbios_entry_t *ep)
381 {
382 uchar_t *p, *q = (uchar_t *)ep;
383 uint8_t esum = 0, isum = 0;
384
385 switch (shp->sh_ent_type) {
386 case SMBIOS_ENTRY_POINT_21:
387 ep->ep21.smbe_ecksum = ep->ep21.smbe_icksum = 0;
388
389 for (p = (uchar_t *)ep->ep21.smbe_ianchor;
390 p < q + sizeof (*ep); p++) {
391 isum += *p;
392 }
393
394 ep->ep21.smbe_icksum = -isum;
395
396 for (p = q; p < q + ep->ep21.smbe_elen; p++)
397 esum += *p;
398
399 ep->ep21.smbe_ecksum = -esum;
400 break;
401 case SMBIOS_ENTRY_POINT_30:
402 ep->ep30.smbe_ecksum = 0;
403 for (p = q; p < q + ep->ep30.smbe_elen; p++)
404 esum += *p;
405
406 ep->ep30.smbe_ecksum = -esum;
407 break;
408 default:
409 break;
410 }
411 }
412
413 const void *
smbios_buf(smbios_hdl_t * shp)414 smbios_buf(smbios_hdl_t *shp)
415 {
416 return (shp->sh_buf);
417 }
418
419 size_t
smbios_buflen(smbios_hdl_t * shp)420 smbios_buflen(smbios_hdl_t *shp)
421 {
422 return (shp->sh_buflen);
423 }
424
425 static smbios_struct_t *
smb_export(const smb_struct_t * stp,smbios_struct_t * sp)426 smb_export(const smb_struct_t *stp, smbios_struct_t *sp)
427 {
428 const smb_header_t *hdr = stp->smbst_hdr;
429
430 sp->smbstr_id = hdr->smbh_hdl;
431 sp->smbstr_type = hdr->smbh_type;
432 sp->smbstr_data = hdr;
433 sp->smbstr_size = (size_t)(stp->smbst_end - (uchar_t *)hdr);
434
435 return (sp);
436 }
437
438 int
smbios_lookup_id(smbios_hdl_t * shp,id_t id,smbios_struct_t * sp)439 smbios_lookup_id(smbios_hdl_t *shp, id_t id, smbios_struct_t *sp)
440 {
441 const smb_struct_t *stp = smb_lookup_id(shp, id);
442
443 if (stp == NULL)
444 return (-1); /* errno is set for us */
445
446 if (sp != NULL)
447 (void) smb_export(stp, sp);
448
449 return (0);
450 }
451
452 int
smbios_lookup_type(smbios_hdl_t * shp,uint_t type,smbios_struct_t * sp)453 smbios_lookup_type(smbios_hdl_t *shp, uint_t type, smbios_struct_t *sp)
454 {
455 const smb_struct_t *stp = smb_lookup_type(shp, type);
456
457 if (stp == NULL)
458 return (-1); /* errno is set for us */
459
460 if (sp != NULL)
461 (void) smb_export(stp, sp);
462
463 return (0);
464 }
465
466 int
smbios_iter(smbios_hdl_t * shp,smbios_struct_f * func,void * data)467 smbios_iter(smbios_hdl_t *shp, smbios_struct_f *func, void *data)
468 {
469 const smb_struct_t *sp = shp->sh_structs;
470 smbios_struct_t s;
471 int i, rv = 0;
472
473 for (i = 0; i < shp->sh_nstructs; i++, sp++) {
474 if (sp->smbst_hdr->smbh_type != SMB_TYPE_INACTIVE &&
475 (rv = func(shp, smb_export(sp, &s), data)) != 0)
476 break;
477 }
478
479 return (rv);
480 }
481
482 const smb_struct_t *
smb_lookup_type(smbios_hdl_t * shp,uint_t type)483 smb_lookup_type(smbios_hdl_t *shp, uint_t type)
484 {
485 uint_t i;
486
487 for (i = 0; i < shp->sh_nstructs; i++) {
488 if (shp->sh_structs[i].smbst_hdr->smbh_type == type)
489 return (&shp->sh_structs[i]);
490 }
491
492 (void) smb_set_errno(shp, ESMB_NOENT);
493 return (NULL);
494 }
495
496 const smb_struct_t *
smb_lookup_id(smbios_hdl_t * shp,uint_t id)497 smb_lookup_id(smbios_hdl_t *shp, uint_t id)
498 {
499 const smb_struct_t *stp = shp->sh_hash[id & (shp->sh_hashlen - 1)];
500
501 switch (id) {
502 case SMB_ID_NOTSUP:
503 (void) smb_set_errno(shp, ESMB_NOTSUP);
504 return (NULL);
505 case SMB_ID_NONE:
506 (void) smb_set_errno(shp, ESMB_NOENT);
507 return (NULL);
508 }
509
510 for (; stp != NULL; stp = stp->smbst_next) {
511 if (stp->smbst_hdr->smbh_hdl == id)
512 break;
513 }
514
515 if (stp == NULL)
516 (void) smb_set_errno(shp, ESMB_NOENT);
517
518 return (stp);
519 }
520
521 const char *
smb_strptr(const smb_struct_t * stp,uint_t i)522 smb_strptr(const smb_struct_t *stp, uint_t i)
523 {
524 if (i == 0 || i > stp->smbst_strtablen)
525 return (_smb_emptystr);
526 else
527 return ((char *)stp->smbst_str + stp->smbst_strtab[i - 1]);
528 }
529
530 boolean_t
smb_libgteq(smbios_hdl_t * shp,int version)531 smb_libgteq(smbios_hdl_t *shp, int version)
532 {
533 return (SMB_MAJOR(shp->sh_libvers) > SMB_MAJOR(version) || (
534 SMB_MAJOR(shp->sh_libvers) == SMB_MAJOR(version) &&
535 SMB_MINOR(shp->sh_libvers) >= SMB_MINOR(version)));
536 }
537
538 boolean_t
smb_gteq(smbios_hdl_t * shp,int version)539 smb_gteq(smbios_hdl_t *shp, int version)
540 {
541 return (SMB_MAJOR(shp->sh_smbvers) > SMB_MAJOR(version) || (
542 SMB_MAJOR(shp->sh_smbvers) == SMB_MAJOR(version) &&
543 SMB_MINOR(shp->sh_smbvers) >= SMB_MINOR(version)));
544 }
545
546 boolean_t
smbios_truncated(smbios_hdl_t * shp)547 smbios_truncated(smbios_hdl_t *shp)
548 {
549 return ((shp->sh_flags & SMB_FL_TRUNC) != 0);
550 }
551