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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* Add to readline cmdline-editing by
* (C) Copyright 2005
* JinHua Luo, GuangDong Linux Center, <luo.jinhua@gd-linux.com>
*/
#include <common.h>
#include <bootstage.h>
#include <cli.h>
#include <cli_hush.h>
#include <command.h>
#include <console.h>
#include <env.h>
#include <fdtdec.h>
#include <hang.h>
#include <malloc.h>
DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_CMDLINE
/*
* Run a command using the selected parser.
*
* @param cmd Command to run
* @param flag Execution flags (CMD_FLAG_...)
* @return 0 on success, or != 0 on error.
*/
int run_command(const char *cmd, int flag)
{
#if !CONFIG_IS_ENABLED(HUSH_PARSER)
/*
* cli_run_command can return 0 or 1 for success, so clean up
* its result.
*/
if (cli_simple_run_command(cmd, flag) == -1)
return 1;
return 0;
#else
int hush_flags = FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP;
if (flag & CMD_FLAG_ENV)
hush_flags |= FLAG_CONT_ON_NEWLINE;
return parse_string_outer(cmd, hush_flags);
#endif
}
/*
* Run a command using the selected parser, and check if it is repeatable.
*
* @param cmd Command to run
* @param flag Execution flags (CMD_FLAG_...)
* @return 0 (not repeatable) or 1 (repeatable) on success, -1 on error.
*/
int run_command_repeatable(const char *cmd, int flag)
{
#ifndef CONFIG_HUSH_PARSER
return cli_simple_run_command(cmd, flag);
#else
/*
* parse_string_outer() returns 1 for failure, so clean up
* its result.
*/
if (parse_string_outer(cmd,
FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP))
return -1;
return 0;
#endif
}
#else
__weak int board_run_command(const char *cmdline)
{
printf("## Commands are disabled. Please enable CONFIG_CMDLINE.\n");
return 1;
}
#endif /* CONFIG_CMDLINE */
int run_command_list(const char *cmd, int len, int flag)
{
int need_buff = 1;
char *buff = (char *)cmd; /* cast away const */
int rcode = 0;
if (len == -1) {
len = strlen(cmd);
#ifdef CONFIG_HUSH_PARSER
/* hush will never change our string */
need_buff = 0;
#else
/* the built-in parser will change our string if it sees \n */
need_buff = strchr(cmd, '\n') != NULL;
#endif
}
if (need_buff) {
buff = malloc(len + 1);
if (!buff)
return 1;
memcpy(buff, cmd, len);
buff[len] = '\0';
}
#ifdef CONFIG_HUSH_PARSER
rcode = parse_string_outer(buff, FLAG_PARSE_SEMICOLON);
#else
/*
* This function will overwrite any \n it sees with a \0, which
* is why it can't work with a const char *. Here we are making
* using of internal knowledge of this function, to avoid always
* doing a malloc() which is actually required only in a case that
* is pretty rare.
*/
#ifdef CONFIG_CMDLINE
rcode = cli_simple_run_command_list(buff, flag);
#else
rcode = board_run_command(buff);
#endif
#endif
if (need_buff)
free(buff);
return rcode;
}
/****************************************************************************/
#if defined(CONFIG_CMD_RUN)
int do_run(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int i;
if (argc < 2)
return CMD_RET_USAGE;
for (i = 1; i < argc; ++i) {
char *arg;
arg = env_get(argv[i]);
if (arg == NULL) {
printf("## Error: \"%s\" not defined\n", argv[i]);
return 1;
}
if (run_command(arg, flag | CMD_FLAG_ENV) != 0)
return 1;
}
return 0;
}
#endif
#if CONFIG_IS_ENABLED(OF_CONTROL)
bool cli_process_fdt(const char **cmdp)
{
/* Allow the fdt to override the boot command */
char *env = fdtdec_get_config_string(gd->fdt_blob, "bootcmd");
if (env)
*cmdp = env;
/*
* If the bootsecure option was chosen, use secure_boot_cmd().
* Always use 'env' in this case, since bootsecure requres that the
* bootcmd was specified in the FDT too.
*/
return fdtdec_get_config_int(gd->fdt_blob, "bootsecure", 0) != 0;
}
/*
* Runs the given boot command securely. Specifically:
* - Doesn't run the command with the shell (run_command or parse_string_outer),
* since that's a lot of code surface that an attacker might exploit.
* Because of this, we don't do any argument parsing--the secure boot command
* has to be a full-fledged u-boot command.
* - Doesn't check for keypresses before booting, since that could be a
* security hole; also disables Ctrl-C.
* - Doesn't allow the command to return.
*
* Upon any failures, this function will drop into an infinite loop after
* printing the error message to console.
*/
void cli_secure_boot_cmd(const char *cmd)
{
#ifdef CONFIG_CMDLINE
cmd_tbl_t *cmdtp;
#endif
int rc;
if (!cmd) {
printf("## Error: Secure boot command not specified\n");
goto err;
}
/* Disable Ctrl-C just in case some command is used that checks it. */
disable_ctrlc(1);
/* Find the command directly. */
#ifdef CONFIG_CMDLINE
cmdtp = find_cmd(cmd);
if (!cmdtp) {
printf("## Error: \"%s\" not defined\n", cmd);
goto err;
}
/* Run the command, forcing no flags and faking argc and argv. */
rc = (cmdtp->cmd)(cmdtp, 0, 1, (char **)&cmd);
#else
rc = board_run_command(cmd);
#endif
/* Shouldn't ever return from boot command. */
printf("## Error: \"%s\" returned (code %d)\n", cmd, rc);
err:
/*
* Not a whole lot to do here. Rebooting won't help much, since we'll
* just end up right back here. Just loop.
*/
hang();
}
#endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
void cli_loop(void)
{
bootstage_mark(BOOTSTAGE_ID_ENTER_CLI_LOOP);
#ifdef CONFIG_HUSH_PARSER
parse_file_outer();
/* This point is never reached */
for (;;);
#elif defined(CONFIG_CMDLINE)
cli_simple_loop();
#else
printf("## U-Boot command line is disabled. Please enable CONFIG_CMDLINE\n");
#endif /*CONFIG_HUSH_PARSER*/
}
void cli_init(void)
{
#ifdef CONFIG_HUSH_PARSER
u_boot_hush_start();
#endif
#if defined(CONFIG_HUSH_INIT_VAR)
hush_init_var();
#endif
}
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