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 */
run_command(const char * cmd,int flag)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 */
run_command_repeatable(const char * cmd,int flag)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
run_command_list(const char * cmd,int len,int flag)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)
do_run(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])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)
cli_process_fdt(const char ** cmdp)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 */
cli_secure_boot_cmd(const char * cmd)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
cli_loop(void)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
cli_init(void)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 }
237