* (C) Copyright 2000-2008
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
/*
* Command line user interface to firmware (=U-Boot) environment.
*
* Implements:
- * fw_printenv [[ -n name ] | [ name ... ]]
+ * fw_printenv [ -a key ] [[ -n name ] | [ name ... ]]
* - prints the value of a single environment variable
* "name", the ``name=value'' pairs of one or more
* environment variables "name", or the whole
* environment if no names are specified.
- * fw_setenv name [ value ... ]
+ * fw_setenv [ -a key ] name [ value ... ]
* - If a name without any values is given, the variable
* with this name is deleted from the environment;
* otherwise, all "value" arguments are concatenated,
* separated by single blank characters, and the
* resulting string is assigned to the environment
* variable "name"
+ *
+ * If '-a key' is specified, the env block is encrypted with AES 128 CBC.
+ * The 'key' argument is in the format of 32 hexadecimal numbers (16 bytes
+ * of AES key), eg. '-a aabbccddeeff00112233445566778899'.
*/
+#include <fcntl.h>
+#include <getopt.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
-#include <getopt.h>
+#include <sys/file.h>
+#include <unistd.h>
#include "fw_env.h"
#define CMD_PRINTENV "fw_printenv"
fprintf(stderr, "fw_printenv/fw_setenv, "
"a command line interface to U-Boot environment\n\n"
- "usage:\tfw_printenv\n"
- "\tfw_setenv [variable name] [variable value]\n"
+ "usage:\tfw_printenv [-a key] [-n] [variable name]\n"
+ "\tfw_setenv [-a key] [variable name] [variable value]\n"
"\tfw_setenv -s [ file ]\n"
"\tfw_setenv -s - < [ file ]\n\n"
"The file passed as argument contains only pairs "
);
}
-int
-main(int argc, char *argv[])
+int main(int argc, char *argv[])
{
char *p;
char *cmdname = *argv;
char *script_file = NULL;
int c;
+ const char *lockname = "/var/lock/" CMD_PRINTENV ".lock";
+ int lockfd = -1;
+ int retval = EXIT_SUCCESS;
+
+ lockfd = open(lockname, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+ if (-1 == lockfd) {
+ fprintf(stderr, "Error opening lock file %s\n", lockname);
+ return EXIT_FAILURE;
+ }
+
+ if (-1 == flock(lockfd, LOCK_EX)) {
+ fprintf(stderr, "Error locking file %s\n", lockname);
+ close(lockfd);
+ return EXIT_FAILURE;
+ }
if ((p = strrchr (cmdname, '/')) != NULL) {
cmdname = p + 1;
}
- while ((c = getopt_long (argc, argv, "s:h",
+ while ((c = getopt_long (argc, argv, "a:ns:h",
long_options, NULL)) != EOF) {
switch (c) {
+ case 'a':
+ /* AES key, handled later */
+ break;
+ case 'n':
+ /* handled in fw_printenv */
+ break;
case 's':
script_file = optarg;
break;
case 'h':
usage();
- return EXIT_SUCCESS;
+ goto exit;
+ default: /* '?' */
+ fprintf(stderr, "Try `%s --help' for more information."
+ "\n", cmdname);
+ retval = EXIT_FAILURE;
+ goto exit;
}
}
-
if (strcmp(cmdname, CMD_PRINTENV) == 0) {
-
- if (fw_printenv (argc, argv) != 0)
- return EXIT_FAILURE;
-
- return EXIT_SUCCESS;
-
+ if (fw_printenv(argc, argv) != 0)
+ retval = EXIT_FAILURE;
} else if (strcmp(cmdname, CMD_SETENV) == 0) {
if (!script_file) {
if (fw_setenv(argc, argv) != 0)
- return EXIT_FAILURE;
+ retval = EXIT_FAILURE;
} else {
if (fw_parse_script(script_file) != 0)
- return EXIT_FAILURE;
+ retval = EXIT_FAILURE;
}
-
- return EXIT_SUCCESS;
-
+ } else {
+ fprintf(stderr,
+ "Identity crisis - may be called as `" CMD_PRINTENV
+ "' or as `" CMD_SETENV "' but not as `%s'\n",
+ cmdname);
+ retval = EXIT_FAILURE;
}
- fprintf (stderr,
- "Identity crisis - may be called as `" CMD_PRINTENV
- "' or as `" CMD_SETENV "' but not as `%s'\n",
- cmdname);
- return EXIT_FAILURE;
+exit:
+ flock(lockfd, LOCK_UN);
+ close(lockfd);
+ return retval;
}
projects / karo-tx-uboot.git / blobdiff