1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/openpromio.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h> /* sprintf() */
#include <unistd.h>
/*
* opp_zalloc(): allocates and initializes a struct openpromio
*
* input: size_t: the size of the variable-length part of the openpromio
* const char *: an initial value for oprom_array, if non-NULL
* output: struct openpromio: the allocated, initialized openpromio
*/
static struct openpromio *
opp_zalloc(size_t size, const char *prop)
{
struct openpromio *opp = malloc(sizeof (struct openpromio) + size);
if (opp != NULL) {
(void) memset(opp, 0, sizeof (struct openpromio) + size);
opp->oprom_size = size;
if (prop != NULL)
(void) strcpy(opp->oprom_array, prop);
}
return (opp);
}
/*
* goto_rootnode(): moves to the root of the devinfo tree
*
* input: int: an open descriptor to /dev/openprom
* output: int: nonzero on success
*/
static int
goto_rootnode(int prom_fd)
{
struct openpromio op = { sizeof (int), 0 };
/* zero it explicitly since a union is involved */
op.oprom_node = 0;
return (ioctl(prom_fd, OPROMNEXT, &op) == 0);
}
/*
* return_property(): returns the value of a given property
*
* input: int: an open descriptor to /dev/openprom
* const char *: the property to look for in the current devinfo node
* output: the value of that property (dynamically allocated)
*/
static char *
return_property(int prom_fd, const char *prop)
{
int proplen;
char *result;
struct openpromio *opp = opp_zalloc(strlen(prop) + 1, prop);
if (opp == NULL)
return (NULL);
if (ioctl(prom_fd, OPROMGETPROPLEN, opp) == -1) {
free(opp);
return (NULL);
}
proplen = opp->oprom_len;
if (proplen > (strlen(prop) + 1)) {
free(opp);
opp = opp_zalloc(proplen, prop);
if (opp == NULL)
return (NULL);
}
if (ioctl(prom_fd, OPROMGETPROP, opp) == -1) {
free(opp);
return (NULL);
}
result = strdup(opp->oprom_array);
free(opp);
return (result);
}
/*
* sanitize_class_id(): translates the class id into a canonical format,
* so that it can be used easily with dhcptab(4).
*
* input: char *: the class id to canonicalize
* output: void
*/
static void
sanitize_class_id(char *src_ptr)
{
char *dst_ptr = src_ptr;
/* remove all spaces and change all commas to periods */
while (*src_ptr != '\0') {
switch (*src_ptr) {
case ' ':
break;
case ',':
*dst_ptr++ = '.';
break;
default:
*dst_ptr++ = *src_ptr;
break;
}
src_ptr++;
}
*dst_ptr = '\0';
}
/*
* get_class_id(): retrieves the class id from the prom, then canonicalizes it
*
* input: void
* output: char *: the class id (dynamically allocated and sanitized)
*/
char *
get_class_id(void)
{
int prom_fd;
char *name, *class_id = NULL;
size_t len;
prom_fd = open("/dev/openprom", O_RDONLY);
if (prom_fd == -1)
return (NULL);
if (goto_rootnode(prom_fd) == 0) {
(void) close(prom_fd);
return (NULL);
}
/*
* the `name' property is the same as the result of `uname -i', modulo
* some stylistic issues we fix up via sanitize_class_id() below.
*/
name = return_property(prom_fd, "name");
(void) close(prom_fd);
if (name == NULL)
return (NULL);
/*
* if the name is not prefixed with a vendor name, add "SUNW," to make
* it more likely to be globally unique; see PSARC/2004/674.
*/
if (strchr(name, ',') == NULL) {
len = strlen(name) + sizeof ("SUNW,");
class_id = malloc(len);
if (class_id == NULL) {
free(name);
return (NULL);
}
(void) snprintf(class_id, len, "SUNW,%s", name);
free(name);
} else {
class_id = name;
}
sanitize_class_id(class_id);
return (class_id);
}
|
