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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23 /*
24 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
25 * Use is subject to license terms.
26 * Copyright (c) 2018, Joyent, Inc.
27 */
28
29 #include <sys/types.h>
30 #include <sys/smbios_impl.h>
31 #include <sys/sysmacros.h>
32 #include <sys/stat.h>
33 #include <sys/mman.h>
34
35 #include <alloca.h>
36 #include <limits.h>
37 #include <unistd.h>
38 #include <strings.h>
39 #include <stdlib.h>
40 #include <errno.h>
41 #include <fcntl.h>
42 #include <libdevinfo.h>
43
44 #pragma init(smb_init)
45 static void
smb_init(void)46 smb_init(void)
47 {
48 _smb_debug = getenv("SMB_DEBUG") != NULL;
49 }
50
51 static smbios_hdl_t *
smb_fileopen(int fd,int version,int flags,int * errp)52 smb_fileopen(int fd, int version, int flags, int *errp)
53 {
54 smbios_entry_t *ep = alloca(SMB_ENTRY_MAXLEN);
55 smbios_entry_point_t ep_type;
56 smbios_hdl_t *shp = NULL;
57 uint32_t smbe_stlen;
58 off64_t smbe_staddr;
59 ssize_t n, elen;
60 void *stbuf;
61
62 if ((n = pread64(fd, ep, sizeof (*ep), 0)) != sizeof (*ep))
63 return (smb_open_error(shp, errp, n < 0 ? errno : ESMB_NOHDR));
64
65 if (strncmp(ep->ep21.smbe_eanchor, SMB_ENTRY_EANCHOR,
66 SMB_ENTRY_EANCHORLEN) == 0) {
67 ep_type = SMBIOS_ENTRY_POINT_21;
68 elen = MIN(ep->ep21.smbe_elen, SMB_ENTRY_MAXLEN);
69 } else if (strncmp(ep->ep30.smbe_eanchor, SMB3_ENTRY_EANCHOR,
70 SMB3_ENTRY_EANCHORLEN) == 0) {
71 ep_type = SMBIOS_ENTRY_POINT_30;
72 elen = MIN(ep->ep30.smbe_elen, SMB_ENTRY_MAXLEN);
73 } else {
74 return (smb_open_error(shp, errp, ESMB_HEADER));
75 }
76
77 if ((n = pread64(fd, ep, elen, 0)) != elen)
78 return (smb_open_error(shp, errp, n < 0 ? errno : ESMB_NOHDR));
79
80 if (ep_type == SMBIOS_ENTRY_POINT_21) {
81 smbe_stlen = ep->ep21.smbe_stlen;
82 smbe_staddr = (off64_t)ep->ep21.smbe_staddr;
83 } else {
84 smbe_stlen = ep->ep30.smbe_stlen;
85 smbe_staddr = (off64_t)ep->ep30.smbe_staddr;
86 }
87 stbuf = smb_alloc(smbe_stlen);
88
89 if (stbuf == NULL)
90 return (smb_open_error(shp, errp, ESMB_NOMEM));
91
92 if ((n = pread64(fd, stbuf, smbe_stlen, smbe_staddr)) != smbe_stlen) {
93 smb_free(stbuf, smbe_stlen);
94 return (smb_open_error(shp, errp, n < 0 ? errno : ESMB_NOSTAB));
95 }
96
97 shp = smbios_bufopen(ep, stbuf, smbe_stlen, version, flags, errp);
98
99 if (shp != NULL)
100 shp->sh_flags |= SMB_FL_BUFALLOC;
101 else
102 smb_free(stbuf, smbe_stlen);
103
104 return (shp);
105 }
106
107 static smbios_hdl_t *
smb_biosopen(int fd,int version,int flags,int * errp)108 smb_biosopen(int fd, int version, int flags, int *errp)
109 {
110 smbios_entry_t *ep = alloca(SMB_ENTRY_MAXLEN);
111 smbios_entry_point_t ep_type;
112 smbios_hdl_t *shp = NULL;
113 size_t pgsize, pgmask, pgoff;
114 void *stbuf, *bios, *p, *q;
115 void *smb2, *smb3;
116 di_node_t root;
117 int64_t *val64;
118 uint32_t smbe_stlen;
119 off64_t smbe_staddr;
120
121 bios = MAP_FAILED;
122 if ((root = di_init("/", DINFOPROP)) != DI_NODE_NIL) {
123 if (di_prop_lookup_int64(DDI_DEV_T_ANY, root,
124 "smbios-address", &val64) == 1) {
125 bios = mmap(NULL, SMB_RANGE_LIMIT - SMB_RANGE_START + 1,
126 PROT_READ, MAP_SHARED, fd, (off_t)*val64);
127 }
128 di_fini(root);
129 }
130 if (bios == MAP_FAILED) {
131 bios = mmap(NULL, SMB_RANGE_LIMIT - SMB_RANGE_START + 1,
132 PROT_READ, MAP_SHARED, fd, (uint32_t)SMB_RANGE_START);
133 }
134
135 if (bios == MAP_FAILED)
136 return (smb_open_error(shp, errp, ESMB_MAPDEV));
137
138 q = (void *)((uintptr_t)bios + SMB_RANGE_LIMIT - SMB_RANGE_START + 1);
139
140 smb2 = smb3 = NULL;
141 for (p = bios; p < q; p = (void *)((uintptr_t)p + SMB_SCAN_STEP)) {
142 if (smb2 != NULL && smb3 != NULL)
143 break;
144 if (smb3 == NULL && strncmp(p, SMB3_ENTRY_EANCHOR,
145 SMB3_ENTRY_EANCHORLEN) == 0) {
146 smb3 = p;
147 } else if (smb2 == NULL && strncmp(p, SMB_ENTRY_EANCHOR,
148 SMB_ENTRY_EANCHORLEN) == 0) {
149 smb2 = p;
150 }
151 }
152
153 /*
154 * While they're not supposed to (as per the SMBIOS 3.2 spec), some
155 * vendors end up having a newer version in one of the two entry points
156 * than the other. If we found multiple tables then we will prefer the
157 * one with the newer version. If they're equivalent, we prefer the
158 * 32-bit version. If only one is present, then we use that.
159 */
160 if (smb2 != NULL && smb3 != NULL) {
161 uint8_t smb2maj, smb2min, smb3maj, smb3min;
162
163 bcopy(smb2, ep, sizeof (smbios_entry_t));
164 smb2maj = ep->ep21.smbe_major;
165 smb2min = ep->ep21.smbe_minor;
166 bcopy(smb3, ep, sizeof (smbios_entry_t));
167 smb3maj = ep->ep30.smbe_major;
168 smb3min = ep->ep30.smbe_minor;
169
170 if (smb3maj > smb2maj ||
171 (smb3maj == smb2maj && smb3min > smb2min)) {
172 ep_type = SMBIOS_ENTRY_POINT_30;
173 p = smb3;
174 } else {
175 ep_type = SMBIOS_ENTRY_POINT_21;
176 p = smb2;
177 }
178 } else if (smb3 != NULL) {
179 ep_type = SMBIOS_ENTRY_POINT_30;
180 p = smb3;
181 } else if (smb2 != NULL) {
182 ep_type = SMBIOS_ENTRY_POINT_21;
183 p = smb2;
184 } else {
185 (void) munmap(bios, SMB_RANGE_LIMIT - SMB_RANGE_START + 1);
186 return (smb_open_error(NULL, errp, ESMB_NOTFOUND));
187 }
188
189 bcopy(p, ep, sizeof (smbios_entry_t));
190
191 switch (ep_type) {
192 case SMBIOS_ENTRY_POINT_21:
193 ep->ep21.smbe_elen = MIN(ep->ep21.smbe_elen, SMB_ENTRY_MAXLEN);
194 bcopy(p, ep, ep->ep21.smbe_elen);
195 smbe_stlen = ep->ep21.smbe_stlen;
196 smbe_staddr = ep->ep21.smbe_staddr;
197 break;
198 case SMBIOS_ENTRY_POINT_30:
199 ep->ep30.smbe_elen = MIN(ep->ep30.smbe_elen, SMB_ENTRY_MAXLEN);
200 bcopy(p, ep, ep->ep30.smbe_elen);
201 smbe_stlen = ep->ep30.smbe_stlen;
202 smbe_staddr = ep->ep30.smbe_staddr;
203 break;
204 default:
205 (void) munmap(bios, SMB_RANGE_LIMIT - SMB_RANGE_START + 1);
206 return (smb_open_error(NULL, errp, ESMB_VERSION));
207 }
208 (void) munmap(bios, SMB_RANGE_LIMIT - SMB_RANGE_START + 1);
209
210 pgsize = getpagesize();
211 pgmask = ~(pgsize - 1);
212 pgoff = smbe_staddr & ~pgmask;
213
214 bios = mmap(NULL, smbe_stlen + pgoff,
215 PROT_READ, MAP_SHARED, fd, smbe_staddr & pgmask);
216
217 if (bios == MAP_FAILED)
218 return (smb_open_error(shp, errp, ESMB_MAPDEV));
219
220 if ((stbuf = smb_alloc(smbe_stlen)) == NULL) {
221 (void) munmap(bios, smbe_stlen + pgoff);
222 return (smb_open_error(shp, errp, ESMB_NOMEM));
223 }
224
225 bcopy((char *)bios + pgoff, stbuf, smbe_stlen);
226 (void) munmap(bios, smbe_stlen + pgoff);
227 shp = smbios_bufopen(ep, stbuf, smbe_stlen, version, flags, errp);
228
229 if (shp != NULL)
230 shp->sh_flags |= SMB_FL_BUFALLOC;
231 else
232 smb_free(stbuf, smbe_stlen);
233
234 return (shp);
235 }
236
237 smbios_hdl_t *
smbios_fdopen(int fd,int version,int flags,int * errp)238 smbios_fdopen(int fd, int version, int flags, int *errp)
239 {
240 struct stat64 st1, st2;
241
242 if (stat64(SMB_BIOS_DEVICE, &st1) == 0 && fstat64(fd, &st2) == 0 &&
243 S_ISCHR(st2.st_mode) && st1.st_rdev == st2.st_rdev)
244 return (smb_biosopen(fd, version, flags, errp));
245 else
246 return (smb_fileopen(fd, version, flags, errp));
247 }
248
249 smbios_hdl_t *
smbios_open(const char * file,int version,int flags,int * errp)250 smbios_open(const char *file, int version, int flags, int *errp)
251 {
252 smbios_hdl_t *shp;
253 int fd;
254
255 if ((fd = open64(file ? file : SMB_SMBIOS_DEVICE, O_RDONLY)) == -1) {
256 if ((errno == ENOENT || errno == ENXIO) &&
257 (file == NULL || strcmp(file, SMB_SMBIOS_DEVICE) == 0))
258 errno = ESMB_NOTFOUND;
259 return (smb_open_error(NULL, errp, errno));
260 }
261
262 shp = smbios_fdopen(fd, version, flags, errp);
263 (void) close(fd);
264 return (shp);
265 }
266
267 static int
smbios_xwrite(smbios_hdl_t * shp,int fd,const void * buf,size_t buflen)268 smbios_xwrite(smbios_hdl_t *shp, int fd, const void *buf, size_t buflen)
269 {
270 ssize_t resid = buflen;
271 ssize_t len;
272
273 while (resid != 0) {
274 if ((len = write(fd, buf, resid)) <= 0)
275 return (smb_set_errno(shp, errno));
276 resid -= len;
277 buf = (uchar_t *)buf + len;
278 }
279
280 return (0);
281 }
282
283 int
smbios_write(smbios_hdl_t * shp,int fd)284 smbios_write(smbios_hdl_t *shp, int fd)
285 {
286 smbios_entry_t ep;
287 off64_t off = lseek64(fd, 0, SEEK_CUR) + P2ROUNDUP(sizeof (ep), 16);
288
289 if (off > UINT32_MAX)
290 return (smb_set_errno(shp, EOVERFLOW));
291
292 bcopy(&shp->sh_ent, &ep, sizeof (ep));
293 if (shp->sh_ent_type == SMBIOS_ENTRY_POINT_21)
294 ep.ep21.smbe_staddr = (uint32_t)off;
295 else if (shp->sh_ent_type == SMBIOS_ENTRY_POINT_30)
296 ep.ep30.smbe_staddr = (uint64_t)off;
297 else
298 return (-1);
299
300 smbios_checksum(shp, &ep);
301
302 if (smbios_xwrite(shp, fd, &ep, sizeof (ep)) == -1 ||
303 lseek64(fd, off, SEEK_SET) != off ||
304 smbios_xwrite(shp, fd, shp->sh_buf, shp->sh_buflen) == -1)
305 return (-1);
306
307 return (0);
308 }
309