/*
   * (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>
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <common.h>
  #include <cli.h>
  #include <cli_hush.h>
  #include <fdtdec.h>
  #include <malloc.h>
  
  DECLARE_GLOBAL_DATA_PTR;
  
  /*
   * 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)
  {
  #ifndef CONFIG_SYS_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_SYS_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
  }
  
  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_SYS_HUSH_PARSER
  		/* hush will never change our string */
  		need_buff = 0;
  #else
  		/* the built-in parser will change our string if it sees 
   */
  		need_buff = strchr(cmd, '
  ') != NULL;
  #endif
  	}
  	if (need_buff) {
  		buff = malloc(len + 1);
  		if (!buff)
  			return 1;
  		memcpy(buff, cmd, len);
  		buff[len] = '\0';
  	}
  #ifdef CONFIG_SYS_HUSH_PARSER
  	rcode = parse_string_outer(buff, FLAG_PARSE_SEMICOLON);
  #else
  	/*
  	 * This function will overwrite any 
   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.
  	 */
  	rcode = cli_simple_run_command_list(buff, flag);
  	if (need_buff)
  		free(buff);
  #endif
  
  	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 = getenv(argv[i]);
  		if (arg == NULL) {
  			printf("## Error: \"%s\" not defined
  ", argv[i]);
  			return 1;
  		}
  
  		if (run_command(arg, flag | CMD_FLAG_ENV) != 0)
  			return 1;
  	}
  	return 0;
  }
  #endif
  
  #ifdef CONFIG_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)
  {
  	cmd_tbl_t *cmdtp;
  	int rc;
  
  	if (!cmd) {
  		printf("## Error: Secure boot command not specified
  ");
  		goto err;
  	}
  
  	/* Disable Ctrl-C just in case some command is used that checks it. */
  	disable_ctrlc(1);
  
  	/* Find the command directly. */
  	cmdtp = find_cmd(cmd);
  	if (!cmdtp) {
  		printf("## Error: \"%s\" not defined
  ", cmd);
  		goto err;
  	}
  
  	/* Run the command, forcing no flags and faking argc and argv. */
  	rc = (cmdtp->cmd)(cmdtp, 0, 1, (char **)&cmd);
  
  	/* Shouldn't ever return from boot command. */
  	printf("## Error: \"%s\" returned (code %d)
  ", 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_OF_CONTROL */
  
  void cli_loop(void)
  {
  #ifdef CONFIG_SYS_HUSH_PARSER
  	parse_file_outer();
  	/* This point is never reached */
  	for (;;);
  #else
  	cli_simple_loop();
  #endif /*CONFIG_SYS_HUSH_PARSER*/
  }
  
  void cli_init(void)
  {
  #ifdef CONFIG_SYS_HUSH_PARSER
  	u_boot_hush_start();
  #endif
  
  #if defined(CONFIG_HUSH_INIT_VAR)
  	hush_init_var();
  #endif
  }