1 /*
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>
15 #include <console.h>
16 #include <fdtdec.h>
17 #include <malloc.h>
18
19 DECLARE_GLOBAL_DATA_PTR;
20
board_run_command(const char * cmdline)21 __weak int board_run_command(const char *cmdline)
22 {
23 return cli_simple_run_command_list((char *)cmdline, 0);
24 }
25
26 /*
27 * Run a command using the selected parser.
28 *
29 * @param cmd Command to run
30 * @param flag Execution flags (CMD_FLAG_...)
31 * @return 0 on success, or != 0 on error.
32 */
run_command(const char * cmd,int flag)33 int run_command(const char *cmd, int flag)
34 {
35 #ifndef CONFIG_HUSH_PARSER
36 /*
37 * cli_run_command can return 0 or 1 for success, so clean up
38 * its result.
39 */
40 if (cli_simple_run_command(cmd, flag) == -1)
41 return 1;
42
43 return 0;
44 #else
45 int hush_flags = FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP;
46
47 if (flag & CMD_FLAG_ENV)
48 hush_flags |= FLAG_CONT_ON_NEWLINE;
49 return parse_string_outer(cmd, hush_flags);
50 #endif
51 }
52
53 /*
54 * Run a command using the selected parser, and check if it is repeatable.
55 *
56 * @param cmd Command to run
57 * @param flag Execution flags (CMD_FLAG_...)
58 * @return 0 (not repeatable) or 1 (repeatable) on success, -1 on error.
59 */
run_command_repeatable(const char * cmd,int flag)60 int run_command_repeatable(const char *cmd, int flag)
61 {
62 #ifndef CONFIG_HUSH_PARSER
63 return cli_simple_run_command(cmd, flag);
64 #else
65 /*
66 * parse_string_outer() returns 1 for failure, so clean up
67 * its result.
68 */
69 if (parse_string_outer(cmd,
70 FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP))
71 return -1;
72
73 return 0;
74 #endif
75 }
76
run_command_list(const char * cmd,int len,int flag)77 int run_command_list(const char *cmd, int len, int flag)
78 {
79 int need_buff = 1;
80 char *buff = (char *)cmd; /* cast away const */
81 int rcode = 0;
82
83 if (len == -1) {
84 len = strlen(cmd);
85 #ifdef CONFIG_HUSH_PARSER
86 /* hush will never change our string */
87 need_buff = 0;
88 #else
89 /* the built-in parser will change our string if it sees \n */
90 need_buff = strchr(cmd, '\n') != NULL;
91 #endif
92 }
93 if (need_buff) {
94 buff = malloc(len + 1);
95 if (!buff)
96 return 1;
97 memcpy(buff, cmd, len);
98 buff[len] = '\0';
99 }
100 #ifdef CONFIG_HUSH_PARSER
101 rcode = parse_string_outer(buff, FLAG_PARSE_SEMICOLON);
102 #else
103 /*
104 * This function will overwrite any \n it sees with a \0, which
105 * is why it can't work with a const char *. Here we are making
106 * using of internal knowledge of this function, to avoid always
107 * doing a malloc() which is actually required only in a case that
108 * is pretty rare.
109 */
110 #ifdef CONFIG_CMDLINE
111 rcode = cli_simple_run_command_list(buff, flag);
112 #else
113 rcode = board_run_command(buff);
114 #endif
115 #endif
116 if (need_buff)
117 free(buff);
118
119 return rcode;
120 }
121
122 /****************************************************************************/
123
124 #if defined(CONFIG_CMD_RUN)
do_run(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])125 int do_run(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
126 {
127 int i;
128
129 if (argc < 2)
130 return CMD_RET_USAGE;
131
132 for (i = 1; i < argc; ++i) {
133 char *arg;
134
135 arg = env_get(argv[i]);
136 if (arg == NULL) {
137 printf("## Error: \"%s\" not defined\n", argv[i]);
138 return 1;
139 }
140
141 if (run_command(arg, flag | CMD_FLAG_ENV) != 0)
142 return 1;
143 }
144 return 0;
145 }
146 #endif
147
148 #if CONFIG_IS_ENABLED(OF_CONTROL)
cli_process_fdt(const char ** cmdp)149 bool cli_process_fdt(const char **cmdp)
150 {
151 /* Allow the fdt to override the boot command */
152 char *env = fdtdec_get_config_string(gd->fdt_blob, "bootcmd");
153 if (env)
154 *cmdp = env;
155 /*
156 * If the bootsecure option was chosen, use secure_boot_cmd().
157 * Always use 'env' in this case, since bootsecure requres that the
158 * bootcmd was specified in the FDT too.
159 */
160 return fdtdec_get_config_int(gd->fdt_blob, "bootsecure", 0) != 0;
161 }
162
163 /*
164 * Runs the given boot command securely. Specifically:
165 * - Doesn't run the command with the shell (run_command or parse_string_outer),
166 * since that's a lot of code surface that an attacker might exploit.
167 * Because of this, we don't do any argument parsing--the secure boot command
168 * has to be a full-fledged u-boot command.
169 * - Doesn't check for keypresses before booting, since that could be a
170 * security hole; also disables Ctrl-C.
171 * - Doesn't allow the command to return.
172 *
173 * Upon any failures, this function will drop into an infinite loop after
174 * printing the error message to console.
175 */
cli_secure_boot_cmd(const char * cmd)176 void cli_secure_boot_cmd(const char *cmd)
177 {
178 #ifdef CONFIG_CMDLINE
179 cmd_tbl_t *cmdtp;
180 #endif
181 int rc;
182
183 if (!cmd) {
184 printf("## Error: Secure boot command not specified\n");
185 goto err;
186 }
187
188 /* Disable Ctrl-C just in case some command is used that checks it. */
189 disable_ctrlc(1);
190
191 /* Find the command directly. */
192 #ifdef CONFIG_CMDLINE
193 cmdtp = find_cmd(cmd);
194 if (!cmdtp) {
195 printf("## Error: \"%s\" not defined\n", cmd);
196 goto err;
197 }
198
199 /* Run the command, forcing no flags and faking argc and argv. */
200 rc = (cmdtp->cmd)(cmdtp, 0, 1, (char **)&cmd);
201
202 #else
203 rc = board_run_command(cmd);
204 #endif
205
206 /* Shouldn't ever return from boot command. */
207 printf("## Error: \"%s\" returned (code %d)\n", cmd, rc);
208
209 err:
210 /*
211 * Not a whole lot to do here. Rebooting won't help much, since we'll
212 * just end up right back here. Just loop.
213 */
214 hang();
215 }
216 #endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
217
218 #ifndef CONFIG_CONSOLE_DISABLE_CLI
cli_loop(void)219 void cli_loop(void)
220 {
221 #ifdef CONFIG_HUSH_PARSER
222 parse_file_outer();
223 /* This point is never reached */
224 for (;;);
225 #elif defined(CONFIG_CMDLINE)
226 cli_simple_loop();
227 #else
228 printf("## U-Boot command line is disabled. Please enable CONFIG_CMDLINE\n");
229 #endif /*CONFIG_HUSH_PARSER*/
230 }
231 #else
cli_loop(void)232 void cli_loop(void) { }
233 #endif
234
cli_init(void)235 void cli_init(void)
236 {
237 #ifdef CONFIG_HUSH_PARSER
238 u_boot_hush_start();
239 #endif
240
241 #if defined(CONFIG_HUSH_INIT_VAR)
242 hush_init_var();
243 #endif
244 }
245