1 /*-
2 * Copyright (c) 1998 Michael Smith <[email protected]>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 /*
28 * Simple commandline interpreter, toplevel and misc.
29 *
30 * XXX may be obsoleted by BootFORTH or some other, better, interpreter.
31 */
32
33 #include <stand.h>
34 #include <string.h>
35 #include "bootstrap.h"
36
37 #ifdef LOADER_VERIEXEC
38 #include <verify_file.h>
39 #endif
40
41 #define MAXARGS 20 /* maximum number of arguments allowed */
42
43 const char * volatile interp_identifier;
44
45 /*
46 * Interactive mode
47 */
48 void
interact(void)49 interact(void)
50 {
51 static char input[256]; /* big enough? */
52
53 TSENTER();
54
55 /*
56 * Because interp_identifier is volatile, it cannot be optimized out by
57 * the compiler as it's considered an externally observable event. This
58 * prevents the compiler from optimizing out our carefully placed
59 * $Interpreter:4th string that userboot may use to determine that
60 * we need to switch interpreters.
61 */
62 interp_identifier = bootprog_interp;
63 interp_init();
64
65 printf("\n");
66
67 /*
68 * Before interacting, we might want to autoboot.
69 */
70 autoboot_maybe();
71
72 /*
73 * Not autobooting, go manual
74 */
75 printf("\nType '?' for a list of commands, 'help' for more detailed help.\n");
76 if (getenv("prompt") == NULL)
77 setenv("prompt", "${interpret}", 1);
78 if (getenv("interpret") == NULL)
79 setenv("interpret", "OK", 1);
80
81 for (;;) {
82 input[0] = '\0';
83 interp_emit_prompt();
84 ngets(input, sizeof(input));
85 #ifdef LOADER_VERIEXEC
86 /* some settings should be restritcted */
87 ve_status_set(-1, VE_UNVERIFIED_OK);
88 #endif
89 interp_run(input);
90 }
91 }
92
93 /*
94 * Read commands from a file, then execute them.
95 *
96 * We store the commands in memory and close the source file so that the media
97 * holding it can safely go away while we are executing.
98 *
99 * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so
100 * that the script won't stop if they fail).
101 */
102 COMMAND_SET(include, "include", "read commands from a file", command_include);
103
104 static int
command_include(int argc,char * argv[])105 command_include(int argc, char *argv[])
106 {
107 int i;
108 int res;
109 char **argvbuf;
110
111 /*
112 * Since argv is static, we need to save it here.
113 */
114 argvbuf = (char**) calloc((u_int)argc, sizeof(char*));
115 for (i = 0; i < argc; i++)
116 argvbuf[i] = strdup(argv[i]);
117
118 res=CMD_OK;
119 for (i = 1; (i < argc) && (res == CMD_OK); i++)
120 res = interp_include(argvbuf[i]);
121
122 for (i = 0; i < argc; i++)
123 free(argvbuf[i]);
124 free(argvbuf);
125
126 return(res);
127 }
128
129 /*
130 * Emit the current prompt; use the same syntax as the parser
131 * for embedding environment variables. Does not accept input.
132 */
133 void
interp_emit_prompt(void)134 interp_emit_prompt(void)
135 {
136 char *pr, *p, *cp, *ev;
137
138 if ((cp = getenv("prompt")) == NULL)
139 cp = ">";
140 pr = p = strdup(cp);
141
142 while (*p != 0) {
143 if ((*p == '$') && (*(p+1) == '{')) {
144 for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++)
145 ;
146 *cp = 0;
147 ev = getenv(p + 2);
148
149 if (ev != NULL)
150 printf("%s", ev);
151 p = cp + 1;
152 continue;
153 }
154 putchar(*p++);
155 }
156 putchar(' ');
157 free(pr);
158 }
159
160 static struct bootblk_command *
interp_lookup_cmd(const char * cmd)161 interp_lookup_cmd(const char *cmd)
162 {
163 struct bootblk_command **cmdp;
164
165 /* search the command set for the command */
166 SET_FOREACH(cmdp, Xcommand_set) {
167 if (((*cmdp)->c_name != NULL) && !strcmp(cmd, (*cmdp)->c_name))
168 return (*cmdp);
169 }
170 return (NULL);
171 }
172
173 /*
174 * Perform a builtin command
175 */
176 int
interp_builtin_cmd(int argc,char * argv[])177 interp_builtin_cmd(int argc, char *argv[])
178 {
179 int result;
180 struct bootblk_command *cmd;
181
182 if (argc < 1)
183 return (CMD_OK);
184
185 /* set return defaults; a successful command will override these */
186 command_errmsg = command_errbuf;
187 strcpy(command_errbuf, "no error message");
188 result = CMD_ERROR;
189
190 cmd = interp_lookup_cmd(argv[0]);
191 if (cmd != NULL && cmd->c_fn) {
192 TSENTER2(argv[0]);
193 result = cmd->c_fn(argc, argv);
194 TSEXIT();
195 } else {
196 command_errmsg = "unknown command";
197 }
198 return (result);
199 }
200
201 /*
202 * Return true if the builtin command exists
203 */
204 bool
interp_has_builtin_cmd(const char * cmd)205 interp_has_builtin_cmd(const char *cmd)
206 {
207 return (interp_lookup_cmd(cmd) != NULL);
208 }
209