Googler | e00b8eb | 2019-07-08 16:37:07 -0700 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * (C) Copyright 2000-2008 |
| 4 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| 5 | */ |
| 6 | |
| 7 | /* |
| 8 | * Command line user interface to firmware (=U-Boot) environment. |
| 9 | * |
| 10 | * Implements: |
| 11 | * fw_printenv [ -a key ] [[ -n name ] | [ name ... ]] |
| 12 | * - prints the value of a single environment variable |
| 13 | * "name", the ``name=value'' pairs of one or more |
| 14 | * environment variables "name", or the whole |
| 15 | * environment if no names are specified. |
| 16 | * fw_setenv [ -a key ] name [ value ... ] |
| 17 | * - If a name without any values is given, the variable |
| 18 | * with this name is deleted from the environment; |
| 19 | * otherwise, all "value" arguments are concatenated, |
| 20 | * separated by single blank characters, and the |
| 21 | * resulting string is assigned to the environment |
| 22 | * variable "name" |
| 23 | * |
| 24 | * If '-a key' is specified, the env block is encrypted with AES 128 CBC. |
| 25 | * The 'key' argument is in the format of 32 hexadecimal numbers (16 bytes |
| 26 | * of AES key), eg. '-a aabbccddeeff00112233445566778899'. |
| 27 | */ |
| 28 | |
| 29 | #include <fcntl.h> |
| 30 | #include <getopt.h> |
| 31 | #include <stdio.h> |
| 32 | #include <string.h> |
| 33 | #include <stdlib.h> |
| 34 | #include <sys/file.h> |
| 35 | #include <unistd.h> |
| 36 | #include <version.h> |
| 37 | #include "fw_env_private.h" |
| 38 | #include "fw_env.h" |
| 39 | |
| 40 | #define CMD_PRINTENV "fw_printenv" |
| 41 | #define CMD_SETENV "fw_setenv" |
| 42 | static int do_printenv; |
| 43 | |
| 44 | static struct option long_options[] = { |
| 45 | {"config", required_argument, NULL, 'c'}, |
| 46 | {"help", no_argument, NULL, 'h'}, |
| 47 | {"script", required_argument, NULL, 's'}, |
| 48 | {"noheader", no_argument, NULL, 'n'}, |
| 49 | {"lock", required_argument, NULL, 'l'}, |
| 50 | {"version", no_argument, NULL, 'v'}, |
| 51 | {NULL, 0, NULL, 0} |
| 52 | }; |
| 53 | |
| 54 | static struct env_opts env_opts; |
| 55 | |
| 56 | /* setenv options */ |
| 57 | static int noheader; |
| 58 | |
| 59 | /* getenv options */ |
| 60 | static char *script_file; |
| 61 | |
| 62 | void usage_printenv(void) |
| 63 | { |
| 64 | |
| 65 | fprintf(stderr, |
| 66 | "Usage: fw_printenv [OPTIONS]... [VARIABLE]...\n" |
| 67 | "Print variables from U-Boot environment\n" |
| 68 | "\n" |
| 69 | " -h, --help print this help.\n" |
| 70 | " -v, --version display version\n" |
| 71 | #ifdef CONFIG_FILE |
| 72 | " -c, --config configuration file, default:" CONFIG_FILE "\n" |
| 73 | #endif |
| 74 | " -n, --noheader do not repeat variable name in output\n" |
| 75 | " -l, --lock lock node, default:/var/lock\n" |
| 76 | "\n"); |
| 77 | } |
| 78 | |
| 79 | void usage_env_set(void) |
| 80 | { |
| 81 | fprintf(stderr, |
| 82 | "Usage: fw_setenv [OPTIONS]... [VARIABLE]...\n" |
| 83 | "Modify variables in U-Boot environment\n" |
| 84 | "\n" |
| 85 | " -h, --help print this help.\n" |
| 86 | " -v, --version display version\n" |
| 87 | #ifdef CONFIG_FILE |
| 88 | " -c, --config configuration file, default:" CONFIG_FILE "\n" |
| 89 | #endif |
| 90 | " -l, --lock lock node, default:/var/lock\n" |
| 91 | " -s, --script batch mode to minimize writes\n" |
| 92 | "\n" |
| 93 | "Examples:\n" |
| 94 | " fw_setenv foo bar set variable foo equal bar\n" |
| 95 | " fw_setenv foo clear variable foo\n" |
| 96 | " fw_setenv --script file run batch script\n" |
| 97 | "\n" |
| 98 | "Script Syntax:\n" |
| 99 | " key [space] value\n" |
| 100 | " lines starting with '#' are treated as comment\n" |
| 101 | "\n" |
| 102 | " A variable without value will be deleted. Any number of spaces are\n" |
| 103 | " allowed between key and value. Space inside of the value is treated\n" |
| 104 | " as part of the value itself.\n" |
| 105 | "\n" |
| 106 | "Script Example:\n" |
| 107 | " netdev eth0\n" |
| 108 | " kernel_addr 400000\n" |
| 109 | " foo empty empty empty empty empty empty\n" |
| 110 | " bar\n" |
| 111 | "\n"); |
| 112 | } |
| 113 | |
| 114 | static void parse_common_args(int argc, char *argv[]) |
| 115 | { |
| 116 | int c; |
| 117 | |
| 118 | #ifdef CONFIG_FILE |
| 119 | env_opts.config_file = CONFIG_FILE; |
| 120 | #endif |
| 121 | |
| 122 | while ((c = getopt_long(argc, argv, ":a:c:l:h:v", long_options, NULL)) != |
| 123 | EOF) { |
| 124 | switch (c) { |
| 125 | #ifdef CONFIG_FILE |
| 126 | case 'c': |
| 127 | env_opts.config_file = optarg; |
| 128 | break; |
| 129 | #endif |
| 130 | case 'l': |
| 131 | env_opts.lockname = optarg; |
| 132 | break; |
| 133 | case 'h': |
| 134 | do_printenv ? usage_printenv() : usage_env_set(); |
| 135 | exit(EXIT_SUCCESS); |
| 136 | break; |
| 137 | case 'v': |
| 138 | fprintf(stderr, "Compiled with " U_BOOT_VERSION "\n"); |
| 139 | exit(EXIT_SUCCESS); |
| 140 | break; |
| 141 | default: |
| 142 | /* ignore unknown options */ |
| 143 | break; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | /* Reset getopt for the next pass. */ |
| 148 | opterr = 1; |
| 149 | optind = 1; |
| 150 | } |
| 151 | |
| 152 | int parse_printenv_args(int argc, char *argv[]) |
| 153 | { |
| 154 | int c; |
| 155 | |
| 156 | parse_common_args(argc, argv); |
| 157 | |
| 158 | while ((c = getopt_long(argc, argv, "a:c:ns:l:h:v", long_options, NULL)) |
| 159 | != EOF) { |
| 160 | switch (c) { |
| 161 | case 'n': |
| 162 | noheader = 1; |
| 163 | break; |
| 164 | case 'a': |
| 165 | case 'c': |
| 166 | case 'h': |
| 167 | case 'l': |
| 168 | /* ignore common options */ |
| 169 | break; |
| 170 | default: /* '?' */ |
| 171 | usage_printenv(); |
| 172 | exit(EXIT_FAILURE); |
| 173 | break; |
| 174 | } |
| 175 | } |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | int parse_setenv_args(int argc, char *argv[]) |
| 180 | { |
| 181 | int c; |
| 182 | |
| 183 | parse_common_args(argc, argv); |
| 184 | |
| 185 | while ((c = getopt_long(argc, argv, "a:c:ns:l:h:v", long_options, NULL)) |
| 186 | != EOF) { |
| 187 | switch (c) { |
| 188 | case 's': |
| 189 | script_file = optarg; |
| 190 | break; |
| 191 | case 'a': |
| 192 | case 'c': |
| 193 | case 'h': |
| 194 | case 'l': |
| 195 | /* ignore common options */ |
| 196 | break; |
| 197 | default: /* '?' */ |
| 198 | usage_env_set(); |
| 199 | exit(EXIT_FAILURE); |
| 200 | break; |
| 201 | } |
| 202 | } |
| 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | int main(int argc, char *argv[]) |
| 207 | { |
| 208 | char *lockname = "/var/lock/" CMD_PRINTENV ".lock"; |
| 209 | int lockfd = -1; |
| 210 | int retval = EXIT_SUCCESS; |
| 211 | char *_cmdname; |
| 212 | |
| 213 | _cmdname = *argv; |
| 214 | if (strrchr(_cmdname, '/') != NULL) |
| 215 | _cmdname = strrchr(_cmdname, '/') + 1; |
| 216 | |
| 217 | if (strcmp(_cmdname, CMD_PRINTENV) == 0) { |
| 218 | do_printenv = 1; |
| 219 | } else if (strcmp(_cmdname, CMD_SETENV) == 0) { |
| 220 | do_printenv = 0; |
| 221 | } else { |
| 222 | fprintf(stderr, |
| 223 | "Identity crisis - may be called as `%s' or as `%s' but not as `%s'\n", |
| 224 | CMD_PRINTENV, CMD_SETENV, _cmdname); |
| 225 | exit(EXIT_FAILURE); |
| 226 | } |
| 227 | |
| 228 | if (do_printenv) { |
| 229 | if (parse_printenv_args(argc, argv)) |
| 230 | exit(EXIT_FAILURE); |
| 231 | } else { |
| 232 | if (parse_setenv_args(argc, argv)) |
| 233 | exit(EXIT_FAILURE); |
| 234 | } |
| 235 | |
| 236 | /* shift parsed flags, jump to non-option arguments */ |
| 237 | argc -= optind; |
| 238 | argv += optind; |
| 239 | |
| 240 | if (env_opts.lockname) { |
| 241 | lockname = malloc(strlen(env_opts.lockname) + |
| 242 | sizeof(CMD_PRINTENV) + 10); |
| 243 | if (!lockname) { |
| 244 | fprintf(stderr, "Unable allocate memory"); |
| 245 | exit(EXIT_FAILURE); |
| 246 | } |
| 247 | |
| 248 | sprintf(lockname, "%s/%s.lock", |
| 249 | env_opts.lockname, CMD_PRINTENV); |
| 250 | } |
| 251 | |
| 252 | lockfd = open(lockname, O_WRONLY | O_CREAT | O_TRUNC, 0666); |
| 253 | if (-1 == lockfd) { |
| 254 | fprintf(stderr, "Error opening lock file %s\n", lockname); |
| 255 | return EXIT_FAILURE; |
| 256 | } |
| 257 | |
| 258 | if (-1 == flock(lockfd, LOCK_EX)) { |
| 259 | fprintf(stderr, "Error locking file %s\n", lockname); |
| 260 | close(lockfd); |
| 261 | return EXIT_FAILURE; |
| 262 | } |
| 263 | |
| 264 | if (do_printenv) { |
| 265 | if (fw_printenv(argc, argv, noheader, &env_opts) != 0) |
| 266 | retval = EXIT_FAILURE; |
| 267 | } else { |
| 268 | if (!script_file) { |
| 269 | if (fw_env_set(argc, argv, &env_opts) != 0) |
| 270 | retval = EXIT_FAILURE; |
| 271 | } else { |
| 272 | if (fw_parse_script(script_file, &env_opts) != 0) |
| 273 | retval = EXIT_FAILURE; |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | if (env_opts.lockname) |
| 278 | free(lockname); |
| 279 | |
| 280 | flock(lockfd, LOCK_UN); |
| 281 | close(lockfd); |
| 282 | return retval; |
| 283 | } |