mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-12 22:33:18 +00:00
26f923c7cf
* vsnprintf() can truncate cmd, hence it makes no sense to launch such command (it's broken). Moreover, it's better to signalize to the caller about such case (for facilitating debugging or bug hunting). * Fix kernel-doc warnings: include/command.h:264: info: Scanning doc for run_commandf include/command.h:268: warning: contents before sections include/command.h:271: warning: No description found for return value of 'run_commandf' * Add printf-like format attribute to validate at compile-time the format string against parameters's type. * Fix compilation error in case of -Wall, -Werror, -Wextra: error: variable ‘i’ set but not used [-Werror=unused-but-set-variable] * Drop extra ret variable. Signed-off-by: Evgeny Bachinin <EABachinin@sberdevices.ru> Reviewed-by: Simon Glass <sjg@chromium.org>
277 lines
6.4 KiB
C
277 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2000
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* Add to readline cmdline-editing by
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* (C) Copyright 2005
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* JinHua Luo, GuangDong Linux Center, <luo.jinhua@gd-linux.com>
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*/
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#define pr_fmt(fmt) "cli: %s: " fmt, __func__
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#include <common.h>
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#include <bootstage.h>
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#include <cli.h>
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#include <cli_hush.h>
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#include <command.h>
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#include <console.h>
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#include <env.h>
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#include <fdtdec.h>
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#include <hang.h>
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#include <malloc.h>
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#include <asm/global_data.h>
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#include <dm/ofnode.h>
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#include <linux/errno.h>
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#ifdef CONFIG_CMDLINE
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/*
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* Run a command using the selected parser.
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*
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* @param cmd Command to run
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* @param flag Execution flags (CMD_FLAG_...)
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* Return: 0 on success, or != 0 on error.
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*/
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int run_command(const char *cmd, int flag)
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{
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#if !IS_ENABLED(CONFIG_HUSH_PARSER)
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/*
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* cli_run_command can return 0 or 1 for success, so clean up
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* its result.
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*/
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if (cli_simple_run_command(cmd, flag) == -1)
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return 1;
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return 0;
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#else
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int hush_flags = FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP;
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if (flag & CMD_FLAG_ENV)
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hush_flags |= FLAG_CONT_ON_NEWLINE;
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return parse_string_outer(cmd, hush_flags);
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#endif
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}
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/*
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* Run a command using the selected parser, and check if it is repeatable.
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*
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* @param cmd Command to run
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* @param flag Execution flags (CMD_FLAG_...)
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* Return: 0 (not repeatable) or 1 (repeatable) on success, -1 on error.
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*/
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int run_command_repeatable(const char *cmd, int flag)
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{
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#ifndef CONFIG_HUSH_PARSER
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return cli_simple_run_command(cmd, flag);
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#else
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/*
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* parse_string_outer() returns 1 for failure, so clean up
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* its result.
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*/
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if (parse_string_outer(cmd,
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FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP))
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return -1;
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return 0;
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#endif
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}
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#else
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__weak int board_run_command(const char *cmdline)
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{
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printf("## Commands are disabled. Please enable CONFIG_CMDLINE.\n");
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return 1;
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}
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#endif /* CONFIG_CMDLINE */
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int run_command_list(const char *cmd, int len, int flag)
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{
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int need_buff = 1;
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char *buff = (char *)cmd; /* cast away const */
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int rcode = 0;
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if (len == -1) {
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len = strlen(cmd);
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#ifdef CONFIG_HUSH_PARSER
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/* hush will never change our string */
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need_buff = 0;
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#else
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/* the built-in parser will change our string if it sees \n */
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need_buff = strchr(cmd, '\n') != NULL;
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#endif
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}
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if (need_buff) {
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buff = malloc(len + 1);
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if (!buff)
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return 1;
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memcpy(buff, cmd, len);
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buff[len] = '\0';
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}
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#ifdef CONFIG_HUSH_PARSER
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rcode = parse_string_outer(buff, FLAG_PARSE_SEMICOLON);
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#else
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/*
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* This function will overwrite any \n it sees with a \0, which
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* is why it can't work with a const char *. Here we are making
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* using of internal knowledge of this function, to avoid always
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* doing a malloc() which is actually required only in a case that
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* is pretty rare.
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*/
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#ifdef CONFIG_CMDLINE
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rcode = cli_simple_run_command_list(buff, flag);
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#else
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rcode = board_run_command(buff);
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#endif
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#endif
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if (need_buff)
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free(buff);
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return rcode;
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}
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int run_commandf(const char *fmt, ...)
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{
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va_list args;
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int nbytes;
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va_start(args, fmt);
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/*
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* Limit the console_buffer space being used to CONFIG_SYS_CBSIZE,
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* because its last byte is used to fit the replacement of \0 by \n\0
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* in underlying hush parser
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*/
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nbytes = vsnprintf(console_buffer, CONFIG_SYS_CBSIZE, fmt, args);
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va_end(args);
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if (nbytes < 0) {
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pr_debug("I/O internal error occurred.\n");
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return -EIO;
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} else if (nbytes >= CONFIG_SYS_CBSIZE) {
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pr_debug("'fmt' size:%d exceeds the limit(%d)\n",
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nbytes, CONFIG_SYS_CBSIZE);
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return -ENOSPC;
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}
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return run_command(console_buffer, 0);
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}
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/****************************************************************************/
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#if defined(CONFIG_CMD_RUN)
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int do_run(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
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{
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int i, ret;
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if (argc < 2)
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return CMD_RET_USAGE;
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for (i = 1; i < argc; ++i) {
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char *arg;
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arg = env_get(argv[i]);
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if (arg == NULL) {
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printf("## Error: \"%s\" not defined\n", argv[i]);
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return 1;
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}
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ret = run_command(arg, flag | CMD_FLAG_ENV);
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if (ret)
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return ret;
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}
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return 0;
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}
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#endif
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#if CONFIG_IS_ENABLED(OF_CONTROL)
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bool cli_process_fdt(const char **cmdp)
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{
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/* Allow the fdt to override the boot command */
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const char *env = ofnode_conf_read_str("bootcmd");
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if (env)
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*cmdp = env;
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/*
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* If the bootsecure option was chosen, use secure_boot_cmd().
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* Always use 'env' in this case, since bootsecure requres that the
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* bootcmd was specified in the FDT too.
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*/
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return ofnode_conf_read_int("bootsecure", 0);
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}
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/*
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* Runs the given boot command securely. Specifically:
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* - Doesn't run the command with the shell (run_command or parse_string_outer),
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* since that's a lot of code surface that an attacker might exploit.
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* Because of this, we don't do any argument parsing--the secure boot command
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* has to be a full-fledged u-boot command.
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* - Doesn't check for keypresses before booting, since that could be a
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* security hole; also disables Ctrl-C.
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* - Doesn't allow the command to return.
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*
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* Upon any failures, this function will drop into an infinite loop after
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* printing the error message to console.
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*/
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void cli_secure_boot_cmd(const char *cmd)
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{
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#ifdef CONFIG_CMDLINE
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struct cmd_tbl *cmdtp;
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#endif
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int rc;
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if (!cmd) {
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printf("## Error: Secure boot command not specified\n");
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goto err;
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}
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/* Disable Ctrl-C just in case some command is used that checks it. */
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disable_ctrlc(1);
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/* Find the command directly. */
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#ifdef CONFIG_CMDLINE
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cmdtp = find_cmd(cmd);
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if (!cmdtp) {
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printf("## Error: \"%s\" not defined\n", cmd);
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goto err;
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}
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/* Run the command, forcing no flags and faking argc and argv. */
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rc = (cmdtp->cmd)(cmdtp, 0, 1, (char **)&cmd);
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#else
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rc = board_run_command(cmd);
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#endif
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/* Shouldn't ever return from boot command. */
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printf("## Error: \"%s\" returned (code %d)\n", cmd, rc);
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err:
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/*
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* Not a whole lot to do here. Rebooting won't help much, since we'll
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* just end up right back here. Just loop.
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*/
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hang();
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}
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#endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
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void cli_loop(void)
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{
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bootstage_mark(BOOTSTAGE_ID_ENTER_CLI_LOOP);
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#ifdef CONFIG_HUSH_PARSER
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parse_file_outer();
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/* This point is never reached */
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for (;;);
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#elif defined(CONFIG_CMDLINE)
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cli_simple_loop();
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#else
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printf("## U-Boot command line is disabled. Please enable CONFIG_CMDLINE\n");
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#endif /*CONFIG_HUSH_PARSER*/
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}
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void cli_init(void)
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{
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#ifdef CONFIG_HUSH_PARSER
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u_boot_hush_start();
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#endif
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#if defined(CONFIG_HUSH_INIT_VAR)
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hush_init_var();
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#endif
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}
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