1 /* 2 * (C) Copyright 2000-2008 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 /* 9 * Command line user interface to firmware (=U-Boot) environment. 10 * 11 * Implements: 12 * fw_printenv [ -a key ] [[ -n name ] | [ name ... ]] 13 * - prints the value of a single environment variable 14 * "name", the ``name=value'' pairs of one or more 15 * environment variables "name", or the whole 16 * environment if no names are specified. 17 * fw_setenv [ -a key ] name [ value ... ] 18 * - If a name without any values is given, the variable 19 * with this name is deleted from the environment; 20 * otherwise, all "value" arguments are concatenated, 21 * separated by single blank characters, and the 22 * resulting string is assigned to the environment 23 * variable "name" 24 * 25 * If '-a key' is specified, the env block is encrypted with AES 128 CBC. 26 * The 'key' argument is in the format of 32 hexadecimal numbers (16 bytes 27 * of AES key), eg. '-a aabbccddeeff00112233445566778899'. 28 */ 29 30 #include <fcntl.h> 31 #include <getopt.h> 32 #include <stdio.h> 33 #include <string.h> 34 #include <stdlib.h> 35 #include <sys/file.h> 36 #include <unistd.h> 37 #include <version.h> 38 #include "fw_env_private.h" 39 #include "fw_env.h" 40 41 #define CMD_PRINTENV "fw_printenv" 42 #define CMD_SETENV "fw_setenv" 43 static int do_printenv; 44 45 static struct option long_options[] = { 46 {"config", required_argument, NULL, 'c'}, 47 {"help", no_argument, NULL, 'h'}, 48 {"script", required_argument, NULL, 's'}, 49 {"noheader", required_argument, NULL, 'n'}, 50 {"lock", required_argument, NULL, 'l'}, 51 {"version", no_argument, NULL, 'v'}, 52 {NULL, 0, NULL, 0} 53 }; 54 55 static struct env_opts env_opts; 56 57 /* setenv options */ 58 static int noheader; 59 60 /* getenv options */ 61 static char *script_file; 62 63 void usage_printenv(void) 64 { 65 66 fprintf(stderr, 67 "Usage: fw_printenv [OPTIONS]... [VARIABLE]...\n" 68 "Print variables from U-Boot environment\n" 69 "\n" 70 " -h, --help print this help.\n" 71 " -v, --version display version\n" 72 #ifdef CONFIG_FILE 73 " -c, --config configuration file, default:" CONFIG_FILE "\n" 74 #endif 75 " -n, --noheader do not repeat variable name in output\n" 76 " -l, --lock lock node, default:/var/lock\n" 77 "\n"); 78 } 79 80 void usage_env_set(void) 81 { 82 fprintf(stderr, 83 "Usage: fw_setenv [OPTIONS]... [VARIABLE]...\n" 84 "Modify variables in U-Boot environment\n" 85 "\n" 86 " -h, --help print this help.\n" 87 " -v, --version display version\n" 88 #ifdef CONFIG_FILE 89 " -c, --config configuration file, default:" CONFIG_FILE "\n" 90 #endif 91 " -l, --lock lock node, default:/var/lock\n" 92 " -s, --script batch mode to minimize writes\n" 93 "\n" 94 "Examples:\n" 95 " fw_setenv foo bar set variable foo equal bar\n" 96 " fw_setenv foo clear variable foo\n" 97 " fw_setenv --script file run batch script\n" 98 "\n" 99 "Script Syntax:\n" 100 " key [space] value\n" 101 " lines starting with '#' are treated as comment\n" 102 "\n" 103 " A variable without value will be deleted. Any number of spaces are\n" 104 " allowed between key and value. Space inside of the value is treated\n" 105 " as part of the value itself.\n" 106 "\n" 107 "Script Example:\n" 108 " netdev eth0\n" 109 " kernel_addr 400000\n" 110 " foo empty empty empty empty empty empty\n" 111 " bar\n" 112 "\n"); 113 } 114 115 static void parse_common_args(int argc, char *argv[]) 116 { 117 int c; 118 119 #ifdef CONFIG_FILE 120 env_opts.config_file = CONFIG_FILE; 121 #endif 122 123 while ((c = getopt_long(argc, argv, ":a:c:l:h:v", long_options, NULL)) != 124 EOF) { 125 switch (c) { 126 #ifdef CONFIG_FILE 127 case 'c': 128 env_opts.config_file = optarg; 129 break; 130 #endif 131 case 'l': 132 env_opts.lockname = optarg; 133 break; 134 case 'h': 135 do_printenv ? usage_printenv() : usage_env_set(); 136 exit(EXIT_SUCCESS); 137 break; 138 case 'v': 139 fprintf(stderr, "Compiled with " U_BOOT_VERSION "\n"); 140 exit(EXIT_SUCCESS); 141 break; 142 default: 143 /* ignore unknown options */ 144 break; 145 } 146 } 147 148 /* Reset getopt for the next pass. */ 149 opterr = 1; 150 optind = 1; 151 } 152 153 int parse_printenv_args(int argc, char *argv[]) 154 { 155 int c; 156 157 parse_common_args(argc, argv); 158 159 while ((c = getopt_long(argc, argv, "a:c:ns:l:h:v", long_options, NULL)) 160 != EOF) { 161 switch (c) { 162 case 'n': 163 noheader = 1; 164 break; 165 case 'a': 166 case 'c': 167 case 'h': 168 case 'l': 169 /* ignore common options */ 170 break; 171 default: /* '?' */ 172 usage_printenv(); 173 exit(EXIT_FAILURE); 174 break; 175 } 176 } 177 return 0; 178 } 179 180 int parse_setenv_args(int argc, char *argv[]) 181 { 182 int c; 183 184 parse_common_args(argc, argv); 185 186 while ((c = getopt_long(argc, argv, "a:c:ns:l:h:v", long_options, NULL)) 187 != EOF) { 188 switch (c) { 189 case 's': 190 script_file = optarg; 191 break; 192 case 'a': 193 case 'c': 194 case 'h': 195 case 'l': 196 /* ignore common options */ 197 break; 198 default: /* '?' */ 199 usage_env_set(); 200 exit(EXIT_FAILURE); 201 break; 202 } 203 } 204 return 0; 205 } 206 207 int main(int argc, char *argv[]) 208 { 209 char *lockname = "/var/lock/" CMD_PRINTENV ".lock"; 210 int lockfd = -1; 211 int retval = EXIT_SUCCESS; 212 char *_cmdname; 213 214 _cmdname = *argv; 215 if (strrchr(_cmdname, '/') != NULL) 216 _cmdname = strrchr(_cmdname, '/') + 1; 217 218 if (strcmp(_cmdname, CMD_PRINTENV) == 0) { 219 do_printenv = 1; 220 } else if (strcmp(_cmdname, CMD_SETENV) == 0) { 221 do_printenv = 0; 222 } else { 223 fprintf(stderr, 224 "Identity crisis - may be called as `%s' or as `%s' but not as `%s'\n", 225 CMD_PRINTENV, CMD_SETENV, _cmdname); 226 exit(EXIT_FAILURE); 227 } 228 229 if (do_printenv) { 230 if (parse_printenv_args(argc, argv)) 231 exit(EXIT_FAILURE); 232 } else { 233 if (parse_setenv_args(argc, argv)) 234 exit(EXIT_FAILURE); 235 } 236 237 /* shift parsed flags, jump to non-option arguments */ 238 argc -= optind; 239 argv += optind; 240 241 if (env_opts.lockname) { 242 lockname = malloc(sizeof(env_opts.lockname) + 243 sizeof(CMD_PRINTENV) + 10); 244 if (!lockname) { 245 fprintf(stderr, "Unable allocate memory"); 246 exit(EXIT_FAILURE); 247 } 248 249 sprintf(lockname, "%s/%s.lock", 250 env_opts.lockname, CMD_PRINTENV); 251 } 252 253 lockfd = open(lockname, O_WRONLY | O_CREAT | O_TRUNC, 0666); 254 if (-1 == lockfd) { 255 fprintf(stderr, "Error opening lock file %s\n", lockname); 256 return EXIT_FAILURE; 257 } 258 259 if (-1 == flock(lockfd, LOCK_EX)) { 260 fprintf(stderr, "Error locking file %s\n", lockname); 261 close(lockfd); 262 return EXIT_FAILURE; 263 } 264 265 if (do_printenv) { 266 if (fw_printenv(argc, argv, noheader, &env_opts) != 0) 267 retval = EXIT_FAILURE; 268 } else { 269 if (!script_file) { 270 if (fw_env_set(argc, argv, &env_opts) != 0) 271 retval = EXIT_FAILURE; 272 } else { 273 if (fw_parse_script(script_file, &env_opts) != 0) 274 retval = EXIT_FAILURE; 275 } 276 } 277 278 if (env_opts.lockname) 279 free(lockname); 280 281 flock(lockfd, LOCK_UN); 282 close(lockfd); 283 return retval; 284 } 285