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      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
     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 *
    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
    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