blob: fbcd339c9beeb2998c68876f942811426c060682 [file] [log] [blame]
Simon Glass30354972014-04-10 20:01:29 -06001/*
2 * (C) Copyright 2000
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * Add to readline cmdline-editing by
6 * (C) Copyright 2005
7 * JinHua Luo, GuangDong Linux Center, <luo.jinhua@gd-linux.com>
8 *
9 * SPDX-License-Identifier: GPL-2.0+
10 */
11
12#include <common.h>
13#include <cli.h>
14#include <cli_hush.h>
Simon Glass24b852a2015-11-08 23:47:45 -070015#include <console.h>
Simon Glassaffb2152014-04-10 20:01:35 -060016#include <fdtdec.h>
Simon Glass30354972014-04-10 20:01:29 -060017#include <malloc.h>
18
Simon Glassaffb2152014-04-10 20:01:35 -060019DECLARE_GLOBAL_DATA_PTR;
20
Simon Glass30354972014-04-10 20:01:29 -060021/*
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 */
28int run_command(const char *cmd, int flag)
29{
30#ifndef CONFIG_SYS_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
Simon Glass87b63982014-10-07 13:59:43 -060040 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);
Simon Glass30354972014-04-10 20:01:29 -060045#endif
46}
47
Thomas Betker1d43bfd2014-06-05 20:07:57 +020048/*
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 */
55int run_command_repeatable(const char *cmd, int flag)
56{
57#ifndef CONFIG_SYS_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
Simon Glass30354972014-04-10 20:01:29 -060072int run_command_list(const char *cmd, int len, int flag)
73{
74 int need_buff = 1;
75 char *buff = (char *)cmd; /* cast away const */
76 int rcode = 0;
77
78 if (len == -1) {
79 len = strlen(cmd);
80#ifdef CONFIG_SYS_HUSH_PARSER
81 /* hush will never change our string */
82 need_buff = 0;
83#else
84 /* the built-in parser will change our string if it sees \n */
85 need_buff = strchr(cmd, '\n') != NULL;
86#endif
87 }
88 if (need_buff) {
89 buff = malloc(len + 1);
90 if (!buff)
91 return 1;
92 memcpy(buff, cmd, len);
93 buff[len] = '\0';
94 }
95#ifdef CONFIG_SYS_HUSH_PARSER
96 rcode = parse_string_outer(buff, FLAG_PARSE_SEMICOLON);
97#else
98 /*
99 * This function will overwrite any \n it sees with a \0, which
100 * is why it can't work with a const char *. Here we are making
101 * using of internal knowledge of this function, to avoid always
102 * doing a malloc() which is actually required only in a case that
103 * is pretty rare.
104 */
105 rcode = cli_simple_run_command_list(buff, flag);
106 if (need_buff)
107 free(buff);
108#endif
109
110 return rcode;
111}
112
113/****************************************************************************/
114
115#if defined(CONFIG_CMD_RUN)
116int do_run(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
117{
118 int i;
119
120 if (argc < 2)
121 return CMD_RET_USAGE;
122
123 for (i = 1; i < argc; ++i) {
124 char *arg;
125
126 arg = getenv(argv[i]);
127 if (arg == NULL) {
128 printf("## Error: \"%s\" not defined\n", argv[i]);
129 return 1;
130 }
131
Simon Glass87b63982014-10-07 13:59:43 -0600132 if (run_command(arg, flag | CMD_FLAG_ENV) != 0)
Simon Glass30354972014-04-10 20:01:29 -0600133 return 1;
134 }
135 return 0;
136}
137#endif
Simon Glassc1bb2cd2014-04-10 20:01:34 -0600138
Masahiro Yamada0f925822015-08-12 07:31:55 +0900139#if CONFIG_IS_ENABLED(OF_CONTROL)
Simon Glassaffb2152014-04-10 20:01:35 -0600140bool cli_process_fdt(const char **cmdp)
141{
142 /* Allow the fdt to override the boot command */
143 char *env = fdtdec_get_config_string(gd->fdt_blob, "bootcmd");
144 if (env)
145 *cmdp = env;
146 /*
147 * If the bootsecure option was chosen, use secure_boot_cmd().
148 * Always use 'env' in this case, since bootsecure requres that the
149 * bootcmd was specified in the FDT too.
150 */
151 return fdtdec_get_config_int(gd->fdt_blob, "bootsecure", 0) != 0;
152}
153
154/*
155 * Runs the given boot command securely. Specifically:
156 * - Doesn't run the command with the shell (run_command or parse_string_outer),
157 * since that's a lot of code surface that an attacker might exploit.
158 * Because of this, we don't do any argument parsing--the secure boot command
159 * has to be a full-fledged u-boot command.
160 * - Doesn't check for keypresses before booting, since that could be a
161 * security hole; also disables Ctrl-C.
162 * - Doesn't allow the command to return.
163 *
164 * Upon any failures, this function will drop into an infinite loop after
165 * printing the error message to console.
166 */
167void cli_secure_boot_cmd(const char *cmd)
168{
169 cmd_tbl_t *cmdtp;
170 int rc;
171
172 if (!cmd) {
173 printf("## Error: Secure boot command not specified\n");
174 goto err;
175 }
176
177 /* Disable Ctrl-C just in case some command is used that checks it. */
178 disable_ctrlc(1);
179
180 /* Find the command directly. */
181 cmdtp = find_cmd(cmd);
182 if (!cmdtp) {
183 printf("## Error: \"%s\" not defined\n", cmd);
184 goto err;
185 }
186
187 /* Run the command, forcing no flags and faking argc and argv. */
188 rc = (cmdtp->cmd)(cmdtp, 0, 1, (char **)&cmd);
189
190 /* Shouldn't ever return from boot command. */
191 printf("## Error: \"%s\" returned (code %d)\n", cmd, rc);
192
193err:
194 /*
195 * Not a whole lot to do here. Rebooting won't help much, since we'll
196 * just end up right back here. Just loop.
197 */
198 hang();
199}
Masahiro Yamada0f925822015-08-12 07:31:55 +0900200#endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
Simon Glassaffb2152014-04-10 20:01:35 -0600201
Simon Glassc1bb2cd2014-04-10 20:01:34 -0600202void cli_loop(void)
203{
204#ifdef CONFIG_SYS_HUSH_PARSER
205 parse_file_outer();
206 /* This point is never reached */
207 for (;;);
208#else
209 cli_simple_loop();
210#endif /*CONFIG_SYS_HUSH_PARSER*/
211}
212
213void cli_init(void)
214{
215#ifdef CONFIG_SYS_HUSH_PARSER
216 u_boot_hush_start();
217#endif
218
219#if defined(CONFIG_HUSH_INIT_VAR)
220 hush_init_var();
221#endif
222}