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 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include <sys/stat.h>
30 #include <sys/types.h>
31 #include <fcntl.h>
32 #include <sys/openpromio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <stdio.h> /* sprintf() */
36 #include <unistd.h>
37
38 /*
39 * opp_zalloc(): allocates and initializes a struct openpromio
40 *
41 * input: size_t: the size of the variable-length part of the openpromio
42 * const char *: an initial value for oprom_array, if non-NULL
43 * output: struct openpromio: the allocated, initialized openpromio
44 */
45
46 static struct openpromio *
opp_zalloc(size_t size,const char * prop)47 opp_zalloc(size_t size, const char *prop)
48 {
49 struct openpromio *opp = malloc(sizeof (struct openpromio) + size);
50
51 if (opp != NULL) {
52 (void) memset(opp, 0, sizeof (struct openpromio) + size);
53 opp->oprom_size = size;
54 if (prop != NULL)
55 (void) strcpy(opp->oprom_array, prop);
56 }
57 return (opp);
58 }
59
60 /*
61 * goto_rootnode(): moves to the root of the devinfo tree
62 *
63 * input: int: an open descriptor to /dev/openprom
64 * output: int: nonzero on success
65 */
66
67 static int
goto_rootnode(int prom_fd)68 goto_rootnode(int prom_fd)
69 {
70 struct openpromio op = { sizeof (int), 0 };
71
72 /* zero it explicitly since a union is involved */
73 op.oprom_node = 0;
74 return (ioctl(prom_fd, OPROMNEXT, &op) == 0);
75 }
76
77 /*
78 * return_property(): returns the value of a given property
79 *
80 * input: int: an open descriptor to /dev/openprom
81 * const char *: the property to look for in the current devinfo node
82 * output: the value of that property (dynamically allocated)
83 */
84
85 static char *
return_property(int prom_fd,const char * prop)86 return_property(int prom_fd, const char *prop)
87 {
88 int proplen;
89 char *result;
90 struct openpromio *opp = opp_zalloc(strlen(prop) + 1, prop);
91
92 if (opp == NULL)
93 return (NULL);
94
95 if (ioctl(prom_fd, OPROMGETPROPLEN, opp) == -1) {
96 free(opp);
97 return (NULL);
98 }
99
100 proplen = opp->oprom_len;
101 if (proplen > (strlen(prop) + 1)) {
102 free(opp);
103 opp = opp_zalloc(proplen, prop);
104 if (opp == NULL)
105 return (NULL);
106 }
107
108 if (ioctl(prom_fd, OPROMGETPROP, opp) == -1) {
109 free(opp);
110 return (NULL);
111 }
112
113 result = strdup(opp->oprom_array);
114 free(opp);
115 return (result);
116 }
117
118 /*
119 * sanitize_class_id(): translates the class id into a canonical format,
120 * so that it can be used easily with dhcptab(4).
121 *
122 * input: char *: the class id to canonicalize
123 * output: void
124 */
125
126 static void
sanitize_class_id(char * src_ptr)127 sanitize_class_id(char *src_ptr)
128 {
129 char *dst_ptr = src_ptr;
130
131 /* remove all spaces and change all commas to periods */
132 while (*src_ptr != '\0') {
133
134 switch (*src_ptr) {
135
136 case ' ':
137 break;
138
139 case ',':
140 *dst_ptr++ = '.';
141 break;
142
143 default:
144 *dst_ptr++ = *src_ptr;
145 break;
146 }
147 src_ptr++;
148 }
149 *dst_ptr = '\0';
150 }
151
152 /*
153 * get_class_id(): retrieves the class id from the prom, then canonicalizes it
154 *
155 * input: void
156 * output: char *: the class id (dynamically allocated and sanitized)
157 */
158
159 char *
get_class_id(void)160 get_class_id(void)
161 {
162 int prom_fd;
163 char *name, *class_id = NULL;
164 size_t len;
165
166 prom_fd = open("/dev/openprom", O_RDONLY);
167 if (prom_fd == -1)
168 return (NULL);
169
170 if (goto_rootnode(prom_fd) == 0) {
171 (void) close(prom_fd);
172 return (NULL);
173 }
174
175 /*
176 * the `name' property is the same as the result of `uname -i', modulo
177 * some stylistic issues we fix up via sanitize_class_id() below.
178 */
179
180 name = return_property(prom_fd, "name");
181 (void) close(prom_fd);
182 if (name == NULL)
183 return (NULL);
184
185 /*
186 * if the name is not prefixed with a vendor name, add "SUNW," to make
187 * it more likely to be globally unique; see PSARC/2004/674.
188 */
189
190 if (strchr(name, ',') == NULL) {
191 len = strlen(name) + sizeof ("SUNW,");
192 class_id = malloc(len);
193 if (class_id == NULL) {
194 free(name);
195 return (NULL);
196 }
197 (void) snprintf(class_id, len, "SUNW,%s", name);
198 free(name);
199 } else {
200 class_id = name;
201 }
202
203 sanitize_class_id(class_id);
204 return (class_id);
205 }
206