1 /*
2 * Copyright (c) 2006 Maxim Sobolev <sobomax@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
23 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: stable/10/usr.sbin/nvram/nvram.c 253162 2013-07-10 18:07:01Z rdivacky $
27 */
28
29 #include <sys/types.h>
30 #include <sys/uio.h>
31 #include <err.h>
32 #include <errno.h>
33 #include <fcntl.h>
34 #include <paths.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <unistd.h>
39
40 #include <dev/powermac_nvram/powermac_nvramvar.h>
41
42 #define DEVICE_NAME (_PATH_DEV "powermac_nvram")
43
44 static void usage(void);
45 static int remove_var(uint8_t *, int, const char *);
46 static int append_var(uint8_t *, int, const char *, const char *);
47
48 struct deletelist {
49 char *name;
50 struct deletelist *next;
51 struct deletelist *last;
52 };
53
54 static union {
55 uint8_t buf[sizeof(struct chrp_header)];
56 struct chrp_header header;
57 } conv;
58
59 int
main(int argc,char ** argv)60 main(int argc, char **argv)
61 {
62 int opt, dump, fd, res, i, size;
63 uint8_t buf[NVRAM_SIZE], *cp, *common;
64 struct deletelist *dl;
65
66 dump = 0;
67 dl = NULL;
68
69 while((opt = getopt(argc, argv, "d:p")) != -1) {
70 switch(opt) {
71 case 'p':
72 dump = 1;
73 break;
74
75 case 'd':
76 if (dl == NULL) {
77 dl = malloc(sizeof(*dl));
78 if (dl == NULL)
79 err(1, "malloc");
80 bzero(dl, sizeof(*dl));
81 dl->last = dl;
82 } else {
83 dl->last->next = malloc(sizeof(*dl));
84 if (dl->last->next == NULL)
85 err(1, "malloc");
86 dl->last = dl->last->next;
87 bzero(dl->last, sizeof(*dl));
88 }
89 dl->last->name = optarg;
90 break;
91
92 default:
93 usage();
94 /* Not reached */
95 }
96 }
97 argc -= optind;
98 argv += optind;
99
100 if (argc == 0 && dump == 0 && dl == NULL) {
101 usage();
102 /* Not reached */
103 }
104
105 fd = open(DEVICE_NAME, O_RDWR);
106 if (fd == -1)
107 err(1, DEVICE_NAME);
108 for (i = 0; i < (int)sizeof(buf);) {
109 res = read(fd, buf + i, sizeof(buf) - i);
110 if (res == -1 && errno != EINTR)
111 err(1, DEVICE_NAME);
112 if (res == 0)
113 break;
114 if (res > 0)
115 i += res;
116 }
117 if (i != sizeof(buf))
118 errx(1, "%s: short read", DEVICE_NAME);
119
120 /* Locate common block */
121 size = 0;
122 for (cp = buf; cp < buf + sizeof(buf); cp += size) {
123 memcpy(conv.buf, cp, sizeof(struct chrp_header));
124 size = conv.header.length * 0x10;
125 if (strncmp(conv.header.name, "common", 7) == 0)
126 break;
127 }
128 if (cp >= buf + sizeof(buf) || size <= (int)sizeof(struct chrp_header))
129 errx(1, "%s: no common block", DEVICE_NAME);
130 common = cp + sizeof(struct chrp_header);
131 size -= sizeof(struct chrp_header);
132
133 if (dump != 0) {
134 while (size > 0) {
135 i = strlen(common) + 1;
136 if (i == 1)
137 break;
138 printf("%s\n", common);
139 size -= i;
140 common += i;
141 }
142 exit(0);
143 }
144
145 for (;dl != NULL; dl = dl->next) {
146 if (remove_var(common, size, dl->name) == 0)
147 warnx("%s: no such variable", dl->name);
148 }
149
150 for (; argc > 0; argc--, argv++) {
151 cp = strchr(*argv, '=');
152 if (cp == NULL)
153 errx(1, "%s: invalid argument", *argv);
154 cp[0] = '\0';
155 cp++;
156 remove_var(common, size, *argv);
157 if (append_var(common, size, *argv, cp) == -1)
158 errx(1, "%s: error setting variable", *argv);
159 }
160
161 for (i = 0; i < (int)sizeof(buf);) {
162 res = write(fd, buf + i, sizeof(buf) - i);
163 if (res == -1 && errno != EINTR)
164 err(1, DEVICE_NAME);
165 if (res == 0)
166 break;
167 if (res > 0)
168 i += res;
169 }
170 if (i != sizeof(buf))
171 errx(1, "%s: short write", DEVICE_NAME);
172 if (close(fd) == -1)
173 err(1, DEVICE_NAME);
174
175 exit(0);
176 }
177
178 static void
usage(void)179 usage(void)
180 {
181
182 fprintf(stderr, "usage: nvram [-p] | [-d name ...] [name=value ...]\n");
183 exit(1);
184 }
185
186 static int
remove_var(uint8_t * buf,int len,const char * var_name)187 remove_var(uint8_t *buf, int len, const char *var_name)
188 {
189 int nremoved, i, name_len;
190
191 nremoved = 0;
192 name_len = strlen(var_name);
193 while (len > 0) {
194 i = strlen(buf) + 1;
195 if (i == 1)
196 break;
197 if (strncmp(buf, var_name, name_len) == 0 && buf[name_len] == '=') {
198 memmove(buf, buf + i, len - i);
199 memset(buf + len - i, '\0', i);
200 nremoved += 1;
201 continue;
202 }
203 len -= i;
204 buf += i;
205 }
206 return nremoved;
207 }
208
209 static int
append_var(uint8_t * buf,int len,const char * var_name,const char * var_value)210 append_var(uint8_t *buf, int len, const char *var_name, const char *var_value)
211 {
212 int i, append_len;
213
214 while (len > 0) {
215 i = strlen(buf) + 1;
216 if (i == 1)
217 break;
218 len -= i;
219 buf += i;
220 }
221 append_len = strlen(var_name) + strlen(var_value) + 2;
222 if (len < append_len)
223 return -1;
224 sprintf(buf, "%s=%s", var_name, var_value);
225 return 0;
226 }
227