common/cli.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  *
   6  * Add to readline cmdline-editing by
   7  * (C) Copyright 2005
   8  * JinHua Luo, GuangDong Linux Center, <luo.jinhua@gd-linux.com>
   9  */
  10
  11 #include <common.h>
  12 #include <cli.h>
  13 #include <cli_hush.h>
  14 #include <console.h>
  15 #include <fdtdec.h>
  16 #include <malloc.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 #ifdef CONFIG_CMDLINE
  21 /*
  22  * Run a command using the selected parser.
  23  *
  24  * @param cmd   Command to run
  25  * @param flag  Execution flags (CMD_FLAG_...)
  26  * @return 0 on success, or != 0 on error.
  27  */
  28 int run_command(const char *cmd, int flag)
  29 {
  30 #if !CONFIG_IS_ENABLED(HUSH_PARSER)
  31         /*
  32          * cli_run_command can return 0 or 1 for success, so clean up
  33          * its result.
  34          */
  35         if (cli_simple_run_command(cmd, flag) == -1)
  36                 return 1;
  37
  38         return 0;
  39 #else
  40         int hush_flags = FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP;
  41
  42         if (flag & CMD_FLAG_ENV)
  43                 hush_flags |= FLAG_CONT_ON_NEWLINE;
  44         return parse_string_outer(cmd, hush_flags);
  45 #endif
  46 }
  47
  48 /*
  49  * Run a command using the selected parser, and check if it is repeatable.
  50  *
  51  * @param cmd   Command to run
  52  * @param flag  Execution flags (CMD_FLAG_...)
  53  * @return 0 (not repeatable) or 1 (repeatable) on success, -1 on error.
  54  */
  55 int run_command_repeatable(const char *cmd, int flag)
  56 {
  57 #ifndef CONFIG_HUSH_PARSER
  58         return cli_simple_run_command(cmd, flag);
  59 #else
  60         /*
  61          * parse_string_outer() returns 1 for failure, so clean up
  62          * its result.
  63          */
  64         if (parse_string_outer(cmd,
  65                                FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP))
  66                 return -1;
  67
  68         return 0;
  69 #endif
  70 }
  71 #endif /* CONFIG_CMDLINE */
  72
  73 int run_command_list(const char *cmd, int len, int flag)
  74 {
  75         int need_buff = 1;
  76         char *buff = (char *)cmd;       /* cast away const */
  77         int rcode = 0;
  78
  79         if (len == -1) {
  80                 len = strlen(cmd);
  81 #ifdef CONFIG_HUSH_PARSER
  82                 /* hush will never change our string */
  83                 need_buff = 0;
  84 #else
  85                 /* the built-in parser will change our string if it sees \n */
  86                 need_buff = strchr(cmd, '\n') != NULL;
  87 #endif
  88         }
  89         if (need_buff) {
  90                 buff = malloc(len + 1);
  91                 if (!buff)
  92                         return 1;
  93                 memcpy(buff, cmd, len);
  94                 buff[len] = '\0';
  95         }
  96 #ifdef CONFIG_HUSH_PARSER
  97         rcode = parse_string_outer(buff, FLAG_PARSE_SEMICOLON);
  98 #else
  99         /*
 100          * This function will overwrite any \n it sees with a \0, which
 101          * is why it can't work with a const char *. Here we are making
 102          * using of internal knowledge of this function, to avoid always
 103          * doing a malloc() which is actually required only in a case that
 104          * is pretty rare.
 105          */
 106 #ifdef CONFIG_CMDLINE
 107         rcode = cli_simple_run_command_list(buff, flag);
 108 #else
 109         rcode = board_run_command(buff);
 110 #endif
 111 #endif
 112         if (need_buff)
 113                 free(buff);
 114
 115         return rcode;
 116 }
 117
 118 /****************************************************************************/
 119
 120 #if defined(CONFIG_CMD_RUN)
 121 int do_run(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 122 {
 123         int i;
 124
 125         if (argc < 2)
 126                 return CMD_RET_USAGE;
 127
 128         for (i = 1; i < argc; ++i) {
 129                 char *arg;
 130
 131                 arg = env_get(argv[i]);
 132                 if (arg == NULL) {
 133                         printf("## Error: \"%s\" not defined\n", argv[i]);
 134                         return 1;
 135                 }
 136
 137                 if (run_command(arg, flag | CMD_FLAG_ENV) != 0)
 138                         return 1;
 139         }
 140         return 0;
 141 }
 142 #endif
 143
 144 #if CONFIG_IS_ENABLED(OF_CONTROL)
 145 bool cli_process_fdt(const char **cmdp)
 146 {
 147         /* Allow the fdt to override the boot command */
 148         char *env = fdtdec_get_config_string(gd->fdt_blob, "bootcmd");
 149         if (env)
 150                 *cmdp = env;
 151         /*
 152          * If the bootsecure option was chosen, use secure_boot_cmd().
 153          * Always use 'env' in this case, since bootsecure requres that the
 154          * bootcmd was specified in the FDT too.
 155          */
 156         return fdtdec_get_config_int(gd->fdt_blob, "bootsecure", 0) != 0;
 157 }
 158
 159 /*
 160  * Runs the given boot command securely.  Specifically:
 161  * - Doesn't run the command with the shell (run_command or parse_string_outer),
 162  *   since that's a lot of code surface that an attacker might exploit.
 163  *   Because of this, we don't do any argument parsing--the secure boot command
 164  *   has to be a full-fledged u-boot command.
 165  * - Doesn't check for keypresses before booting, since that could be a
 166  *   security hole; also disables Ctrl-C.
 167  * - Doesn't allow the command to return.
 168  *
 169  * Upon any failures, this function will drop into an infinite loop after
 170  * printing the error message to console.
 171  */
 172 void cli_secure_boot_cmd(const char *cmd)
 173 {
 174 #ifdef CONFIG_CMDLINE
 175         cmd_tbl_t *cmdtp;
 176 #endif
 177         int rc;
 178
 179         if (!cmd) {
 180                 printf("## Error: Secure boot command not specified\n");
 181                 goto err;
 182         }
 183
 184         /* Disable Ctrl-C just in case some command is used that checks it. */
 185         disable_ctrlc(1);
 186
 187         /* Find the command directly. */
 188 #ifdef CONFIG_CMDLINE
 189         cmdtp = find_cmd(cmd);
 190         if (!cmdtp) {
 191                 printf("## Error: \"%s\" not defined\n", cmd);
 192                 goto err;
 193         }
 194
 195         /* Run the command, forcing no flags and faking argc and argv. */
 196         rc = (cmdtp->cmd)(cmdtp, 0, 1, (char **)&cmd);
 197
 198 #else
 199         rc = board_run_command(cmd);
 200 #endif
 201
 202         /* Shouldn't ever return from boot command. */
 203         printf("## Error: \"%s\" returned (code %d)\n", cmd, rc);
 204
 205 err:
 206         /*
 207          * Not a whole lot to do here.  Rebooting won't help much, since we'll
 208          * just end up right back here.  Just loop.
 209          */
 210         hang();
 211 }
 212 #endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
 213
 214 void cli_loop(void)
 215 {
 216 #ifdef CONFIG_HUSH_PARSER
 217         parse_file_outer();
 218         /* This point is never reached */
 219         for (;;);
 220 #elif defined(CONFIG_CMDLINE)
 221         cli_simple_loop();
 222 #else
 223         printf("## U-Boot command line is disabled. Please enable CONFIG_CMDLINE\n");
 224 #endif /*CONFIG_HUSH_PARSER*/
 225 }
 226
 227 void cli_init(void)
 228 {
 229 #ifdef CONFIG_HUSH_PARSER
 230         u_boot_hush_start();
 231 #endif
 232
 233 #if defined(CONFIG_HUSH_INIT_VAR)
 234         hush_init_var();
 235 #endif
 236 }