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 */
27
28 #pragma ident "%Z%%M% %I% %E% SMI"
29
30 #include <sys/types.h>
31 #include <sys/smbios_impl.h>
32 #include <sys/sysmacros.h>
33 #include <sys/stat.h>
34 #include <sys/mman.h>
35
36 #include <alloca.h>
37 #include <limits.h>
38 #include <unistd.h>
39 #include <strings.h>
40 #include <stdlib.h>
41 #include <errno.h>
42 #include <fcntl.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_hdl_t *shp = NULL;
56 ssize_t n, elen;
57 void *stbuf;
58
59 if ((n = pread64(fd, ep, sizeof (*ep), 0)) != sizeof (*ep))
60 return (smb_open_error(shp, errp, n < 0 ? errno : ESMB_NOHDR));
61
62 if (strncmp(ep->smbe_eanchor, SMB_ENTRY_EANCHOR, SMB_ENTRY_EANCHORLEN))
63 return (smb_open_error(shp, errp, ESMB_HEADER));
64
65 elen = MIN(ep->smbe_elen, SMB_ENTRY_MAXLEN);
66
67 if ((n = pread64(fd, ep, elen, 0)) != elen)
68 return (smb_open_error(shp, errp, n < 0 ? errno : ESMB_NOHDR));
69
70 if ((stbuf = smb_alloc(ep->smbe_stlen)) == NULL)
71 return (smb_open_error(shp, errp, ESMB_NOMEM));
72
73 if ((n = pread64(fd, stbuf, ep->smbe_stlen,
74 (off64_t)ep->smbe_staddr)) != ep->smbe_stlen) {
75 smb_free(stbuf, ep->smbe_stlen);
76 return (smb_open_error(shp, errp, n < 0 ? errno : ESMB_NOSTAB));
77 }
78
79 shp = smbios_bufopen(ep, stbuf, ep->smbe_stlen, version, flags, errp);
80
81 if (shp != NULL)
82 shp->sh_flags |= SMB_FL_BUFALLOC;
83 else
84 smb_free(stbuf, ep->smbe_stlen);
85
86 return (shp);
87 }
88
89 static smbios_hdl_t *
smb_biosopen(int fd,int version,int flags,int * errp)90 smb_biosopen(int fd, int version, int flags, int *errp)
91 {
92 smbios_entry_t *ep = alloca(SMB_ENTRY_MAXLEN);
93 smbios_hdl_t *shp = NULL;
94 size_t pgsize, pgmask, pgoff;
95 void *stbuf, *bios, *p, *q;
96
97 bios = mmap(NULL, SMB_RANGE_LIMIT - SMB_RANGE_START + 1,
98 PROT_READ, MAP_SHARED, fd, (uint32_t)SMB_RANGE_START);
99
100 if (bios == MAP_FAILED)
101 return (smb_open_error(shp, errp, ESMB_MAPDEV));
102
103 q = (void *)((uintptr_t)bios + SMB_RANGE_LIMIT - SMB_RANGE_START + 1);
104
105 for (p = bios; p < q; p = (void *)((uintptr_t)p + 16)) {
106 if (strncmp(p, SMB_ENTRY_EANCHOR, SMB_ENTRY_EANCHORLEN) == 0)
107 break;
108 }
109
110 if (p >= q) {
111 (void) munmap(bios, SMB_RANGE_LIMIT - SMB_RANGE_START + 1);
112 return (smb_open_error(NULL, errp, ESMB_NOTFOUND));
113 }
114
115 bcopy(p, ep, sizeof (smbios_entry_t));
116 ep->smbe_elen = MIN(ep->smbe_elen, SMB_ENTRY_MAXLEN);
117 bcopy(p, ep, ep->smbe_elen);
118 (void) munmap(bios, SMB_RANGE_LIMIT - SMB_RANGE_START + 1);
119
120 pgsize = getpagesize();
121 pgmask = ~(pgsize - 1);
122 pgoff = ep->smbe_staddr & ~pgmask;
123
124 bios = mmap(NULL, ep->smbe_stlen + pgoff,
125 PROT_READ, MAP_SHARED, fd, ep->smbe_staddr & pgmask);
126
127 if (bios == MAP_FAILED)
128 return (smb_open_error(shp, errp, ESMB_MAPDEV));
129
130 if ((stbuf = smb_alloc(ep->smbe_stlen)) == NULL) {
131 (void) munmap(bios, ep->smbe_stlen + pgoff);
132 return (smb_open_error(shp, errp, ESMB_NOMEM));
133 }
134
135 bcopy((char *)bios + pgoff, stbuf, ep->smbe_stlen);
136 (void) munmap(bios, ep->smbe_stlen + pgoff);
137 shp = smbios_bufopen(ep, stbuf, ep->smbe_stlen, version, flags, errp);
138
139 if (shp != NULL)
140 shp->sh_flags |= SMB_FL_BUFALLOC;
141 else
142 smb_free(stbuf, ep->smbe_stlen);
143
144 return (shp);
145 }
146
147 smbios_hdl_t *
smbios_fdopen(int fd,int version,int flags,int * errp)148 smbios_fdopen(int fd, int version, int flags, int *errp)
149 {
150 struct stat64 st1, st2;
151
152 if (stat64(SMB_BIOS_DEVICE, &st1) == 0 && fstat64(fd, &st2) == 0 &&
153 S_ISCHR(st2.st_mode) && st1.st_rdev == st2.st_rdev)
154 return (smb_biosopen(fd, version, flags, errp));
155 else
156 return (smb_fileopen(fd, version, flags, errp));
157 }
158
159 smbios_hdl_t *
smbios_open(const char * file,int version,int flags,int * errp)160 smbios_open(const char *file, int version, int flags, int *errp)
161 {
162 smbios_hdl_t *shp;
163 int fd;
164
165 if ((fd = open64(file ? file : SMB_SMBIOS_DEVICE, O_RDONLY)) == -1) {
166 if ((errno == ENOENT || errno == ENXIO) &&
167 (file == NULL || strcmp(file, SMB_SMBIOS_DEVICE) == 0))
168 errno = ESMB_NOTFOUND;
169 return (smb_open_error(NULL, errp, errno));
170 }
171
172 shp = smbios_fdopen(fd, version, flags, errp);
173 (void) close(fd);
174 return (shp);
175 }
176
177 static int
smbios_xwrite(smbios_hdl_t * shp,int fd,const void * buf,size_t buflen)178 smbios_xwrite(smbios_hdl_t *shp, int fd, const void *buf, size_t buflen)
179 {
180 ssize_t resid = buflen;
181 ssize_t len;
182
183 while (resid != 0) {
184 if ((len = write(fd, buf, resid)) <= 0)
185 return (smb_set_errno(shp, errno));
186 resid -= len;
187 buf = (uchar_t *)buf + len;
188 }
189
190 return (0);
191 }
192
193 int
smbios_write(smbios_hdl_t * shp,int fd)194 smbios_write(smbios_hdl_t *shp, int fd)
195 {
196 smbios_entry_t ep;
197 off64_t off = lseek64(fd, 0, SEEK_CUR) + P2ROUNDUP(sizeof (ep), 16);
198
199 if (off > UINT32_MAX)
200 return (smb_set_errno(shp, EOVERFLOW));
201
202 bcopy(&shp->sh_ent, &ep, sizeof (ep));
203 ep.smbe_staddr = (uint32_t)off;
204 smbios_checksum(shp, &ep);
205
206 if (smbios_xwrite(shp, fd, &ep, sizeof (ep)) == -1 ||
207 lseek64(fd, off, SEEK_SET) != off ||
208 smbios_xwrite(shp, fd, shp->sh_buf, shp->sh_buflen) == -1)
209 return (-1);
210
211 return (0);
212 }
213