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![Robert P. J. Day](/assets/img/avatar_default.png)
Fix various misspellings of: * deprecated * partition * preceding,preceded * preparation * its versus it's * export * existing * scenario * redundant * remaining * value * architecture Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Reviewed-by: Jagan Teki <jteki@openedev.com> Reviewed-by: Stefan Roese <sr@denx.de>
303 lines
6.2 KiB
C
303 lines
6.2 KiB
C
/*
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* (C) Copyright 2000-2010
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Andreas Heppel <aheppel@sysgo.de>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <environment.h>
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#include <linux/stddef.h>
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#include <search.h>
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#include <errno.h>
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#include <malloc.h>
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DECLARE_GLOBAL_DATA_PTR;
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/************************************************************************
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* Default settings to be used when no valid environment is found
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*/
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#include <env_default.h>
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struct hsearch_data env_htab = {
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.change_ok = env_flags_validate,
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};
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__weak uchar env_get_char_spec(int index)
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{
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return *((uchar *)(gd->env_addr + index));
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}
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static uchar env_get_char_init(int index)
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{
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/* if crc was bad, use the default environment */
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if (gd->env_valid)
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return env_get_char_spec(index);
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else
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return default_environment[index];
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}
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uchar env_get_char_memory(int index)
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{
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return *env_get_addr(index);
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}
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uchar env_get_char(int index)
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{
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/* if relocated to RAM */
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if (gd->flags & GD_FLG_RELOC)
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return env_get_char_memory(index);
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else
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return env_get_char_init(index);
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}
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const uchar *env_get_addr(int index)
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{
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if (gd->env_valid)
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return (uchar *)(gd->env_addr + index);
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else
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return &default_environment[index];
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}
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/*
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* Read an environment variable as a boolean
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* Return -1 if variable does not exist (default to true)
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*/
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int getenv_yesno(const char *var)
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{
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char *s = getenv(var);
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if (s == NULL)
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return -1;
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return (*s == '1' || *s == 'y' || *s == 'Y' || *s == 't' || *s == 'T') ?
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1 : 0;
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}
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/*
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* Look up the variable from the default environment
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*/
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char *getenv_default(const char *name)
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{
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char *ret_val;
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unsigned long really_valid = gd->env_valid;
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unsigned long real_gd_flags = gd->flags;
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/* Pretend that the image is bad. */
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gd->flags &= ~GD_FLG_ENV_READY;
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gd->env_valid = 0;
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ret_val = getenv(name);
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gd->env_valid = really_valid;
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gd->flags = real_gd_flags;
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return ret_val;
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}
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void set_default_env(const char *s)
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{
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int flags = 0;
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if (sizeof(default_environment) > ENV_SIZE) {
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puts("*** Error - default environment is too large\n\n");
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return;
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}
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if (s) {
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if (*s == '!') {
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printf("*** Warning - %s, "
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"using default environment\n\n",
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s + 1);
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} else {
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flags = H_INTERACTIVE;
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puts(s);
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}
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} else {
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puts("Using default environment\n\n");
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}
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if (himport_r(&env_htab, (char *)default_environment,
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sizeof(default_environment), '\0', flags, 0,
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0, NULL) == 0)
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error("Environment import failed: errno = %d\n", errno);
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gd->flags |= GD_FLG_ENV_READY;
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gd->flags |= GD_FLG_ENV_DEFAULT;
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}
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/* [re]set individual variables to their value in the default environment */
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int set_default_vars(int nvars, char * const vars[])
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{
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/*
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* Special use-case: import from default environment
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* (and use \0 as a separator)
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*/
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return himport_r(&env_htab, (const char *)default_environment,
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sizeof(default_environment), '\0',
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H_NOCLEAR | H_INTERACTIVE, 0, nvars, vars);
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}
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#ifdef CONFIG_ENV_AES
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#include <aes.h>
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/**
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* env_aes_cbc_get_key() - Get AES-128-CBC key for the environment
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*
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* This function shall return 16-byte array containing AES-128 key used
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* to encrypt and decrypt the environment. This function must be overridden
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* by the implementer as otherwise the environment encryption will not
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* work.
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*/
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__weak uint8_t *env_aes_cbc_get_key(void)
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{
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return NULL;
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}
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static int env_aes_cbc_crypt(env_t *env, const int enc)
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{
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unsigned char *data = env->data;
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uint8_t *key;
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uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
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uint32_t aes_blocks;
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key = env_aes_cbc_get_key();
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if (!key)
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return -EINVAL;
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/* First we expand the key. */
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aes_expand_key(key, key_exp);
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/* Calculate the number of AES blocks to encrypt. */
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aes_blocks = ENV_SIZE / AES_KEY_LENGTH;
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if (enc)
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aes_cbc_encrypt_blocks(key_exp, data, data, aes_blocks);
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else
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aes_cbc_decrypt_blocks(key_exp, data, data, aes_blocks);
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return 0;
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}
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#else
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static inline int env_aes_cbc_crypt(env_t *env, const int enc)
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{
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return 0;
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}
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#endif
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/*
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* Check if CRC is valid and (if yes) import the environment.
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* Note that "buf" may or may not be aligned.
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*/
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int env_import(const char *buf, int check)
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{
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env_t *ep = (env_t *)buf;
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int ret;
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if (check) {
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uint32_t crc;
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memcpy(&crc, &ep->crc, sizeof(crc));
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if (crc32(0, ep->data, ENV_SIZE) != crc) {
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set_default_env("!bad CRC");
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return 0;
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}
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}
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/* Decrypt the env if desired. */
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ret = env_aes_cbc_crypt(ep, 0);
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if (ret) {
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error("Failed to decrypt env!\n");
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set_default_env("!import failed");
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return ret;
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}
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if (himport_r(&env_htab, (char *)ep->data, ENV_SIZE, '\0', 0, 0,
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0, NULL)) {
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gd->flags |= GD_FLG_ENV_READY;
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return 1;
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}
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error("Cannot import environment: errno = %d\n", errno);
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set_default_env("!import failed");
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return 0;
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}
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/* Export the environment and generate CRC for it. */
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int env_export(env_t *env_out)
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{
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char *res;
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ssize_t len;
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int ret;
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res = (char *)env_out->data;
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len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
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if (len < 0) {
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error("Cannot export environment: errno = %d\n", errno);
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return 1;
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}
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/* Encrypt the env if desired. */
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ret = env_aes_cbc_crypt(env_out, 1);
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if (ret)
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return ret;
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env_out->crc = crc32(0, env_out->data, ENV_SIZE);
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return 0;
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}
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void env_relocate(void)
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{
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#if defined(CONFIG_NEEDS_MANUAL_RELOC)
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env_reloc();
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env_htab.change_ok += gd->reloc_off;
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#endif
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if (gd->env_valid == 0) {
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#if defined(CONFIG_ENV_IS_NOWHERE) || defined(CONFIG_SPL_BUILD)
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/* Environment not changable */
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set_default_env(NULL);
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#else
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bootstage_error(BOOTSTAGE_ID_NET_CHECKSUM);
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set_default_env("!bad CRC");
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#endif
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} else {
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env_relocate_spec();
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}
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}
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#if defined(CONFIG_AUTO_COMPLETE) && !defined(CONFIG_SPL_BUILD)
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int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf)
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{
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ENTRY *match;
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int found, idx;
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idx = 0;
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found = 0;
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cmdv[0] = NULL;
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while ((idx = hmatch_r(var, idx, &match, &env_htab))) {
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int vallen = strlen(match->key) + 1;
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if (found >= maxv - 2 || bufsz < vallen)
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break;
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cmdv[found++] = buf;
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memcpy(buf, match->key, vallen);
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buf += vallen;
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bufsz -= vallen;
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}
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qsort(cmdv, found, sizeof(cmdv[0]), strcmp_compar);
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if (idx)
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cmdv[found++] = "...";
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cmdv[found] = NULL;
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return found;
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}
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#endif
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