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common/cli.c
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d41ce506b Initial Release, ... |
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/* * (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 <console.h> #include <fdtdec.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) { #ifndef CONFIG_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 } #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 */ 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_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. */ #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 ", 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 "); 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 ", 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) ", 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) { #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 "); #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 } |