avionic design with actual uboot and tooling
submodule of avionic design uboot bootloader and with included tools to get you started , read readme.md and readme-tk1-loader.md
This commit is contained in:
266
u-boot/tools/env/fw_env_main.c
vendored
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266
u-boot/tools/env/fw_env_main.c
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/*
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* (C) Copyright 2000-2008
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* Command line user interface to firmware (=U-Boot) environment.
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*
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* Implements:
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* fw_printenv [ -a key ] [[ -n name ] | [ name ... ]]
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* - prints the value of a single environment variable
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* "name", the ``name=value'' pairs of one or more
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* environment variables "name", or the whole
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* environment if no names are specified.
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* fw_setenv [ -a key ] name [ value ... ]
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* - If a name without any values is given, the variable
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* with this name is deleted from the environment;
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* otherwise, all "value" arguments are concatenated,
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* separated by single blank characters, and the
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* resulting string is assigned to the environment
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* variable "name"
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*
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* If '-a key' is specified, the env block is encrypted with AES 128 CBC.
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* The 'key' argument is in the format of 32 hexadecimal numbers (16 bytes
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* of AES key), eg. '-a aabbccddeeff00112233445566778899'.
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*/
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#include <fcntl.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/file.h>
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#include <unistd.h>
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#include "fw_env.h"
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#define CMD_PRINTENV "fw_printenv"
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#define CMD_SETENV "fw_setenv"
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static int do_printenv;
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static struct option long_options[] = {
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{"aes", required_argument, NULL, 'a'},
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{"config", required_argument, NULL, 'c'},
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{"help", no_argument, NULL, 'h'},
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{"script", required_argument, NULL, 's'},
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{"noheader", required_argument, NULL, 'n'},
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{NULL, 0, NULL, 0}
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};
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static struct env_opts env_opts;
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/* setenv options */
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static int noheader;
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/* getenv options */
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static char *script_file;
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void usage_printenv(void)
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{
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fprintf(stderr,
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"Usage: fw_printenv [OPTIONS]... [VARIABLE]...\n"
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"Print variables from U-Boot environment\n"
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"\n"
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" -h, --help print this help.\n"
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#ifdef CONFIG_ENV_AES
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" -a, --aes aes key to access environment\n"
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#endif
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#ifdef CONFIG_FILE
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" -c, --config configuration file, default:" CONFIG_FILE "\n"
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#endif
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" -n, --noheader do not repeat variable name in output\n"
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"\n");
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}
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void usage_setenv(void)
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{
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fprintf(stderr,
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"Usage: fw_setenv [OPTIONS]... [VARIABLE]...\n"
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"Modify variables in U-Boot environment\n"
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"\n"
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" -h, --help print this help.\n"
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#ifdef CONFIG_ENV_AES
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" -a, --aes aes key to access environment\n"
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#endif
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#ifdef CONFIG_FILE
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" -c, --config configuration file, default:" CONFIG_FILE "\n"
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#endif
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" -s, --script batch mode to minimize writes\n"
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"\n"
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"Examples:\n"
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" fw_setenv foo bar set variable foo equal bar\n"
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" fw_setenv foo clear variable foo\n"
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" fw_setenv --script file run batch script\n"
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"\n"
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"Script Syntax:\n"
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" key [space] value\n"
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" lines starting with '#' are treated as comment\n"
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"\n"
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" A variable without value will be deleted. Any number of spaces are\n"
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" allowed between key and value. Space inside of the value is treated\n"
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" as part of the value itself.\n"
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"\n"
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"Script Example:\n"
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" netdev eth0\n"
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" kernel_addr 400000\n"
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" foo empty empty empty empty empty empty\n"
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" bar\n"
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"\n");
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}
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static void parse_common_args(int argc, char *argv[])
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{
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int c;
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#ifdef CONFIG_FILE
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env_opts.config_file = CONFIG_FILE;
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#endif
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while ((c = getopt_long(argc, argv, ":a:c:h", long_options, NULL)) !=
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EOF) {
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switch (c) {
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case 'a':
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if (parse_aes_key(optarg, env_opts.aes_key)) {
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fprintf(stderr, "AES key parse error\n");
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exit(EXIT_FAILURE);
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}
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env_opts.aes_flag = 1;
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break;
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#ifdef CONFIG_FILE
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case 'c':
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env_opts.config_file = optarg;
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break;
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#endif
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case 'h':
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do_printenv ? usage_printenv() : usage_setenv();
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exit(EXIT_SUCCESS);
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break;
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default:
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/* ignore unknown options */
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break;
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}
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}
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/* Reset getopt for the next pass. */
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opterr = 1;
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optind = 1;
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}
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int parse_printenv_args(int argc, char *argv[])
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{
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int c;
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parse_common_args(argc, argv);
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while ((c = getopt_long(argc, argv, "a:c:ns:h", long_options, NULL)) !=
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EOF) {
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switch (c) {
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case 'n':
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noheader = 1;
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break;
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case 'a':
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case 'c':
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case 'h':
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/* ignore common options */
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break;
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default: /* '?' */
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usage_printenv();
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exit(EXIT_FAILURE);
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break;
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}
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}
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return 0;
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}
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int parse_setenv_args(int argc, char *argv[])
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{
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int c;
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parse_common_args(argc, argv);
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while ((c = getopt_long(argc, argv, "a:c:ns:h", long_options, NULL)) !=
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EOF) {
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switch (c) {
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case 's':
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script_file = optarg;
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break;
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case 'a':
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case 'c':
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case 'h':
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/* ignore common options */
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break;
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default: /* '?' */
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usage_setenv();
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exit(EXIT_FAILURE);
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break;
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}
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}
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return 0;
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}
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int main(int argc, char *argv[])
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{
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const char *lockname = "/var/lock/" CMD_PRINTENV ".lock";
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int lockfd = -1;
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int retval = EXIT_SUCCESS;
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char *_cmdname;
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_cmdname = *argv;
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if (strrchr(_cmdname, '/') != NULL)
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_cmdname = strrchr(_cmdname, '/') + 1;
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if (strcmp(_cmdname, CMD_PRINTENV) == 0) {
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do_printenv = 1;
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} else if (strcmp(_cmdname, CMD_SETENV) == 0) {
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do_printenv = 0;
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} else {
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fprintf(stderr,
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"Identity crisis - may be called as `%s' or as `%s' but not as `%s'\n",
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CMD_PRINTENV, CMD_SETENV, _cmdname);
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exit(EXIT_FAILURE);
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}
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if (do_printenv) {
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if (parse_printenv_args(argc, argv))
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exit(EXIT_FAILURE);
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} else {
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if (parse_setenv_args(argc, argv))
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exit(EXIT_FAILURE);
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}
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/* shift parsed flags, jump to non-option arguments */
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argc -= optind;
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argv += optind;
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lockfd = open(lockname, O_WRONLY | O_CREAT | O_TRUNC, 0666);
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if (-1 == lockfd) {
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fprintf(stderr, "Error opening lock file %s\n", lockname);
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return EXIT_FAILURE;
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}
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if (-1 == flock(lockfd, LOCK_EX)) {
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fprintf(stderr, "Error locking file %s\n", lockname);
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close(lockfd);
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return EXIT_FAILURE;
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}
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if (do_printenv) {
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if (fw_printenv(argc, argv, noheader, &env_opts) != 0)
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retval = EXIT_FAILURE;
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} else {
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if (!script_file) {
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if (fw_setenv(argc, argv, &env_opts) != 0)
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retval = EXIT_FAILURE;
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} else {
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if (fw_parse_script(script_file, &env_opts) != 0)
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retval = EXIT_FAILURE;
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}
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}
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flock(lockfd, LOCK_UN);
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close(lockfd);
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return retval;
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}
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