1 /* $NetBSD: bootconfig.c,v 1.13 2020/10/18 16:28:57 skrll Exp $ */
2
3 /*
4 * Copyright (c) 1994-1998 Mark Brinicombe.
5 * Copyright (c) 1994 Brini.
6 * All rights reserved.
7 *
8 * This code is derived from software written for Brini by Mark Brinicombe
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by Mark Brinicombe
21 * for the NetBSD Project.
22 * 4. The name of the company nor the name of the author may be used to
23 * endorse or promote products derived from this software without specific
24 * prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
30 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
31 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39 #include "ether.h"
40
41 #include <sys/param.h>
42
43 __KERNEL_RCSID(0, "$NetBSD: bootconfig.c,v 1.13 2020/10/18 16:28:57 skrll Exp $");
44
45 #include <sys/systm.h>
46 #include <sys/kmem.h>
47
48 #include <machine/bootconfig.h>
49
50 #if NETHER > 0
51 #include <net/if_ether.h>
52 #endif
53
54 /*
55 * Function to identify and process different types of boot argument
56 * Note, results may contain trailing data, eg:
57 * get_bootconf_option("cow=moo milk=1", "moo", BOOTOPT_TYPE_STRING, &ptr)
58 * will return ptr of "moo milk=1", *not* "moo"
59 */
60
61 int __noasan
get_bootconf_option(char * opts,const char * opt,int type,void * result)62 get_bootconf_option(char *opts, const char *opt, int type, void *result)
63 {
64 char *ptr;
65 char *optstart;
66 bool neg;
67
68 ptr = opts;
69
70 while (*ptr) {
71 /* Find start of option */
72 while (*ptr == ' ' || *ptr == '\t')
73 ++ptr;
74
75 if (*ptr == 0)
76 break;
77
78 neg = false;
79
80 /* Is it a negate option */
81 if ((type & BOOTOPT_TYPE_MASK) == BOOTOPT_TYPE_BOOLEAN &&
82 *ptr == '!') {
83 neg = true;
84 ++ptr;
85 }
86
87 /* Find the end of option */
88 optstart = ptr;
89 while (*ptr != 0 && *ptr != ' ' && *ptr != '\t' && *ptr != '=')
90 ++ptr;
91
92 if (*ptr == '=' ||
93 (type & BOOTOPT_TYPE_MASK) == BOOTOPT_TYPE_BOOLEAN) {
94 /* compare the option */
95 if (strncmp(optstart, opt, (ptr - optstart)) == 0) {
96 /* found */
97
98 if (*ptr == '=')
99 ++ptr;
100
101 switch (type & BOOTOPT_TYPE_MASK) {
102 case BOOTOPT_TYPE_BOOLEAN :
103 if (*(ptr - 1) == '=')
104 *((int *)result) =
105 ((u_int)strtoul(ptr, NULL,
106 10) != 0);
107 else
108 *((int *)result) = !neg;
109 break;
110 case BOOTOPT_TYPE_STRING :
111 *((char **)result) = ptr;
112 break;
113 case BOOTOPT_TYPE_INT :
114 *((int *)result) =
115 (u_int)strtoul(ptr, NULL, 10);
116 break;
117 case BOOTOPT_TYPE_BININT :
118 *((int *)result) =
119 (u_int)strtoul(ptr, NULL, 2);
120 break;
121 case BOOTOPT_TYPE_HEXINT :
122 *((int *)result) =
123 (u_int)strtoul(ptr, NULL, 16);
124 break;
125 #if NETHER > 0
126 case BOOTOPT_TYPE_MACADDR : {
127 char mac[18];
128 if (strlen(ptr) < ETHER_ADDR_LEN)
129 return 0;
130 strlcpy(mac, ptr, sizeof(mac));
131 if (ether_aton_r((u_char *)result,
132 ETHER_ADDR_LEN, mac))
133 return 0;
134 break;
135 }
136 #endif
137 default:
138 return 0;
139 }
140 return 1;
141 }
142 }
143 /* skip to next option */
144 while (*ptr != ' ' && *ptr != '\t' && *ptr != 0)
145 ++ptr;
146 }
147 return 0;
148 }
149
150 char *
get_bootconf_string(char * opts,const char * key)151 get_bootconf_string(char *opts, const char *key)
152 {
153 char *s, *ret;
154 int i = 0;
155
156 if (!get_bootconf_option(opts, key, BOOTOPT_TYPE_STRING, &s))
157 return NULL;
158
159 for (;;) {
160 if (s[i] == ' ' || s[i] == '\t' || s[i] == '\0')
161 break;
162 ++i;
163 }
164
165 ret = kmem_alloc(i + 1, KM_SLEEP);
166 strlcpy(ret, s, i + 1);
167 return ret;
168 }
169
170 bool
match_bootconf_option(char * opts,const char * key,const char * val)171 match_bootconf_option(char *opts, const char *key, const char *val)
172 {
173 char *s;
174
175 if (!get_bootconf_option(opts, key, BOOTOPT_TYPE_STRING, &s))
176 return false;
177
178 return strncmp(s, val, strlen(val)) == 0;
179 }
180