// 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>
#include <asm/global_data.h>
#include <dm/ofnode.h>

#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(struct cmd_tbl *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 */
        const char *env = ofnode_conf_read_str("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 ofnode_conf_read_int("bootsecure", 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
        struct cmd_tbl *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
}