1 | /* |
2 | * Command line interface for libnvram |
3 | * |
4 | * Copyright 2009, Jo-Philipp Wich <xm@subsignal.org> |
5 | * |
6 | * This program is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License |
8 | * as published by the Free Software Foundation; either version 2 |
9 | * of the License, or (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
19 | * |
20 | * |
21 | * The libnvram code is based on Broadcom code for Linux 2.4.x . |
22 | * |
23 | */ |
24 | |
25 | #include "nvram.h" |
26 | |
27 | |
28 | static nvram_handle_t * nvram_open_rdonly(void) |
29 | { |
30 | const char *file = nvram_find_staging(); |
31 | |
32 | if( file == NULL ) |
33 | file = nvram_find_mtd(); |
34 | |
35 | if( file != NULL ) |
36 | return nvram_open(file, NVRAM_RO); |
37 | |
38 | return NULL; |
39 | } |
40 | |
41 | static nvram_handle_t * nvram_open_staging(void) |
42 | { |
43 | if( nvram_find_staging() != NULL || nvram_to_staging() == 0 ) |
44 | return nvram_open(NVRAM_STAGING, NVRAM_RW); |
45 | |
46 | return NULL; |
47 | } |
48 | |
49 | static int do_show(nvram_handle_t *nvram) |
50 | { |
51 | nvram_tuple_t *t; |
52 | int stat = 1; |
53 | |
54 | if( (t = nvram_getall(nvram)) != NULL ) |
55 | { |
56 | while( t ) |
57 | { |
58 | printf("%s=%s\n", t->name, t->value); |
59 | t = t->next; |
60 | } |
61 | |
62 | stat = 0; |
63 | } |
64 | |
65 | return stat; |
66 | } |
67 | |
68 | static int do_get(nvram_handle_t *nvram, const char *var) |
69 | { |
70 | const char *val; |
71 | int stat = 1; |
72 | |
73 | if( (val = nvram_get(nvram, var)) != NULL ) |
74 | { |
75 | printf("%s\n", val); |
76 | stat = 0; |
77 | } |
78 | |
79 | return stat; |
80 | } |
81 | |
82 | static int do_unset(nvram_handle_t *nvram, const char *var) |
83 | { |
84 | return nvram_unset(nvram, var); |
85 | } |
86 | |
87 | static int do_set(nvram_handle_t *nvram, const char *pair) |
88 | { |
89 | char *val = strstr(pair, "="); |
90 | char var[strlen(pair)]; |
91 | int stat = 1; |
92 | |
93 | if( val != NULL ) |
94 | { |
95 | memset(var, 0, sizeof(var)); |
96 | strncpy(var, pair, (int)(val-pair)); |
97 | stat = nvram_set(nvram, var, (char *)(val + 1)); |
98 | } |
99 | |
100 | return stat; |
101 | } |
102 | |
103 | static int do_info(nvram_handle_t *nvram) |
104 | { |
105 | nvram_header_t *hdr = nvram_header(nvram); |
106 | |
107 | /* CRC8 over the last 11 bytes of the header and data bytes */ |
108 | uint8_t crc = hndcrc8((unsigned char *) &hdr[0] + NVRAM_CRC_START_POSITION, |
109 | hdr->len - NVRAM_CRC_START_POSITION, 0xff); |
110 | |
111 | /* Show info */ |
112 | printf("Magic: 0x%08X\n", hdr->magic); |
113 | printf("Length: 0x%08X\n", hdr->len); |
114 | |
115 | printf("CRC8: 0x%02X (calculated: 0x%02X)\n", |
116 | hdr->crc_ver_init & 0xFF, crc); |
117 | |
118 | printf("Version: 0x%02X\n", (hdr->crc_ver_init >> 8) & 0xFF); |
119 | printf("SDRAM init: 0x%04X\n", (hdr->crc_ver_init >> 16) & 0xFFFF); |
120 | printf("SDRAM config: 0x%04X\n", hdr->config_refresh & 0xFFFF); |
121 | printf("SDRAM refresh: 0x%04X\n", (hdr->config_refresh >> 16) & 0xFFFF); |
122 | printf("NCDL values: 0x%08X\n\n", hdr->config_ncdl); |
123 | |
124 | printf("%i bytes used / %i bytes available (%.2f%%)\n", |
125 | hdr->len, NVRAM_SPACE - hdr->len, |
126 | (100.00 / (double)NVRAM_SPACE) * (double)hdr->len); |
127 | |
128 | return 0; |
129 | } |
130 | |
131 | |
132 | int main( int argc, const char *argv[] ) |
133 | { |
134 | nvram_handle_t *nvram; |
135 | int commit = 0; |
136 | int write = 0; |
137 | int stat = 1; |
138 | int done = 0; |
139 | int i; |
140 | |
141 | /* Ugly... iterate over arguments to see whether we can expect a write */ |
142 | for( i = 1; i < argc; i++ ) |
143 | if( ( !strcmp(argv[i], "set") && ++i < argc ) || |
144 | ( !strcmp(argv[i], "unset") && ++i < argc ) || |
145 | !strcmp(argv[i], "commit") ) |
146 | { |
147 | write = 1; |
148 | break; |
149 | } |
150 | |
151 | |
152 | nvram = write ? nvram_open_staging() : nvram_open_rdonly(); |
153 | |
154 | if( nvram != NULL && argc > 1 ) |
155 | { |
156 | for( i = 1; i < argc; i++ ) |
157 | { |
158 | if( !strcmp(argv[i], "show") ) |
159 | { |
160 | stat = do_show(nvram); |
161 | done++; |
162 | } |
163 | else if( !strcmp(argv[i], "info") ) |
164 | { |
165 | stat = do_info(nvram); |
166 | done++; |
167 | } |
168 | else if( !strcmp(argv[i], "get") || !strcmp(argv[i], "unset") || !strcmp(argv[i], "set") ) |
169 | { |
170 | if( (i+1) < argc ) |
171 | { |
172 | switch(argv[i++][0]) |
173 | { |
174 | case 'g': |
175 | stat = do_get(nvram, argv[i]); |
176 | break; |
177 | |
178 | case 'u': |
179 | stat = do_unset(nvram, argv[i]); |
180 | break; |
181 | |
182 | case 's': |
183 | stat = do_set(nvram, argv[i]); |
184 | break; |
185 | } |
186 | done++; |
187 | } |
188 | else |
189 | { |
190 | fprintf(stderr, "Command '%s' requires an argument!\n", argv[i]); |
191 | done = 0; |
192 | break; |
193 | } |
194 | } |
195 | else if( !strcmp(argv[i], "commit") ) |
196 | { |
197 | commit = 1; |
198 | done++; |
199 | } |
200 | else |
201 | { |
202 | fprintf(stderr, "Unknown option '%s' !\n", argv[i]); |
203 | done = 0; |
204 | break; |
205 | } |
206 | } |
207 | |
208 | if( write ) |
209 | stat = nvram_commit(nvram); |
210 | |
211 | nvram_close(nvram); |
212 | |
213 | if( commit ) |
214 | stat = staging_to_nvram(); |
215 | } |
216 | |
217 | if( !nvram ) |
218 | { |
219 | fprintf(stderr, |
220 | "Could not open nvram! Possible reasons are:\n" |
221 | " - No device found (/proc not mounted or no nvram present)\n" |
222 | " - Insufficient permissions to open mtd device\n" |
223 | " - Insufficient memory to complete operation\n" |
224 | " - Memory mapping failed or not supported\n" |
225 | ); |
226 | |
227 | stat = 1; |
228 | } |
229 | else if( !done ) |
230 | { |
231 | fprintf(stderr, |
232 | "Usage:\n" |
233 | " nvram show\n" |
234 | " nvram info\n" |
235 | " nvram get variable\n" |
236 | " nvram set variable=value [set ...]\n" |
237 | " nvram unset variable [unset ...]\n" |
238 | " nvram commit\n" |
239 | ); |
240 | |
241 | stat = 1; |
242 | } |
243 | |
244 | return stat; |
245 | } |
246 | |