blob: 272b0288d76d56bbcaf5bb16310898d023b9127c [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 Glassaffb2152014-04-10 20:01:35 -060015#include <fdtdec.h>
Simon Glass30354972014-04-10 20:01:29 -060016#include <malloc.h>
17
Simon Glassaffb2152014-04-10 20:01:35 -060018DECLARE_GLOBAL_DATA_PTR;
19
Simon Glass30354972014-04-10 20:01:29 -060020/*
21 * Run a command using the selected parser.
22 *
23 * @param cmd Command to run
24 * @param flag Execution flags (CMD_FLAG_...)
25 * @return 0 on success, or != 0 on error.
26 */
27int run_command(const char *cmd, int flag)
28{
29#ifndef CONFIG_SYS_HUSH_PARSER
30 /*
31 * cli_run_command can return 0 or 1 for success, so clean up
32 * its result.
33 */
34 if (cli_simple_run_command(cmd, flag) == -1)
35 return 1;
36
37 return 0;
38#else
39 return parse_string_outer(cmd,
40 FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP);
41#endif
42}
43
Thomas Betker1d43bfd2014-06-05 20:07:57 +020044/*
45 * Run a command using the selected parser, and check if it is repeatable.
46 *
47 * @param cmd Command to run
48 * @param flag Execution flags (CMD_FLAG_...)
49 * @return 0 (not repeatable) or 1 (repeatable) on success, -1 on error.
50 */
51int run_command_repeatable(const char *cmd, int flag)
52{
53#ifndef CONFIG_SYS_HUSH_PARSER
54 return cli_simple_run_command(cmd, flag);
55#else
56 /*
57 * parse_string_outer() returns 1 for failure, so clean up
58 * its result.
59 */
60 if (parse_string_outer(cmd,
61 FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP))
62 return -1;
63
64 return 0;
65#endif
66}
67
Simon Glass30354972014-04-10 20:01:29 -060068int run_command_list(const char *cmd, int len, int flag)
69{
70 int need_buff = 1;
71 char *buff = (char *)cmd; /* cast away const */
72 int rcode = 0;
73
74 if (len == -1) {
75 len = strlen(cmd);
76#ifdef CONFIG_SYS_HUSH_PARSER
77 /* hush will never change our string */
78 need_buff = 0;
79#else
80 /* the built-in parser will change our string if it sees \n */
81 need_buff = strchr(cmd, '\n') != NULL;
82#endif
83 }
84 if (need_buff) {
85 buff = malloc(len + 1);
86 if (!buff)
87 return 1;
88 memcpy(buff, cmd, len);
89 buff[len] = '\0';
90 }
91#ifdef CONFIG_SYS_HUSH_PARSER
92 rcode = parse_string_outer(buff, FLAG_PARSE_SEMICOLON);
93#else
94 /*
95 * This function will overwrite any \n it sees with a \0, which
96 * is why it can't work with a const char *. Here we are making
97 * using of internal knowledge of this function, to avoid always
98 * doing a malloc() which is actually required only in a case that
99 * is pretty rare.
100 */
101 rcode = cli_simple_run_command_list(buff, flag);
102 if (need_buff)
103 free(buff);
104#endif
105
106 return rcode;
107}
108
109/****************************************************************************/
110
111#if defined(CONFIG_CMD_RUN)
112int do_run(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
113{
114 int i;
115
116 if (argc < 2)
117 return CMD_RET_USAGE;
118
119 for (i = 1; i < argc; ++i) {
120 char *arg;
121
122 arg = getenv(argv[i]);
123 if (arg == NULL) {
124 printf("## Error: \"%s\" not defined\n", argv[i]);
125 return 1;
126 }
127
128 if (run_command(arg, flag) != 0)
129 return 1;
130 }
131 return 0;
132}
133#endif
Simon Glassc1bb2cd2014-04-10 20:01:34 -0600134
Simon Glassaffb2152014-04-10 20:01:35 -0600135#ifdef CONFIG_OF_CONTROL
136bool cli_process_fdt(const char **cmdp)
137{
138 /* Allow the fdt to override the boot command */
139 char *env = fdtdec_get_config_string(gd->fdt_blob, "bootcmd");
140 if (env)
141 *cmdp = env;
142 /*
143 * If the bootsecure option was chosen, use secure_boot_cmd().
144 * Always use 'env' in this case, since bootsecure requres that the
145 * bootcmd was specified in the FDT too.
146 */
147 return fdtdec_get_config_int(gd->fdt_blob, "bootsecure", 0) != 0;
148}
149
150/*
151 * Runs the given boot command securely. Specifically:
152 * - Doesn't run the command with the shell (run_command or parse_string_outer),
153 * since that's a lot of code surface that an attacker might exploit.
154 * Because of this, we don't do any argument parsing--the secure boot command
155 * has to be a full-fledged u-boot command.
156 * - Doesn't check for keypresses before booting, since that could be a
157 * security hole; also disables Ctrl-C.
158 * - Doesn't allow the command to return.
159 *
160 * Upon any failures, this function will drop into an infinite loop after
161 * printing the error message to console.
162 */
163void cli_secure_boot_cmd(const char *cmd)
164{
165 cmd_tbl_t *cmdtp;
166 int rc;
167
168 if (!cmd) {
169 printf("## Error: Secure boot command not specified\n");
170 goto err;
171 }
172
173 /* Disable Ctrl-C just in case some command is used that checks it. */
174 disable_ctrlc(1);
175
176 /* Find the command directly. */
177 cmdtp = find_cmd(cmd);
178 if (!cmdtp) {
179 printf("## Error: \"%s\" not defined\n", cmd);
180 goto err;
181 }
182
183 /* Run the command, forcing no flags and faking argc and argv. */
184 rc = (cmdtp->cmd)(cmdtp, 0, 1, (char **)&cmd);
185
186 /* Shouldn't ever return from boot command. */
187 printf("## Error: \"%s\" returned (code %d)\n", cmd, rc);
188
189err:
190 /*
191 * Not a whole lot to do here. Rebooting won't help much, since we'll
192 * just end up right back here. Just loop.
193 */
194 hang();
195}
196#endif /* CONFIG_OF_CONTROL */
197
Simon Glassc1bb2cd2014-04-10 20:01:34 -0600198void cli_loop(void)
199{
200#ifdef CONFIG_SYS_HUSH_PARSER
201 parse_file_outer();
202 /* This point is never reached */
203 for (;;);
204#else
205 cli_simple_loop();
206#endif /*CONFIG_SYS_HUSH_PARSER*/
207}
208
209void cli_init(void)
210{
211#ifdef CONFIG_SYS_HUSH_PARSER
212 u_boot_hush_start();
213#endif
214
215#if defined(CONFIG_HUSH_INIT_VAR)
216 hush_init_var();
217#endif
218}