| 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 | |
