1 /*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 /*
31 * Loading modules, booting the system
32 */
33
34 #include <stand.h>
35 #include <sys/reboot.h>
36 #include <sys/boot.h>
37 #include <string.h>
38
39 #include "bootstrap.h"
40
41 static int autoboot(int timeout, char *prompt);
42 static char *getbootfile(int try);
43 static int loadakernel(int try, int argc, char* argv[]);
44
45 /* List of kernel names to try (may be overwritten by boot.config) XXX should move from here? */
46 static const char *default_bootfiles = "kernel";
47
48 static int autoboot_tried;
49
50 /*
51 * The user wants us to boot.
52 */
53 COMMAND_SET(boot, "boot", "boot a file or loaded kernel", command_boot);
54
55 static int
command_boot(int argc,char * argv[])56 command_boot(int argc, char *argv[])
57 {
58 struct preloaded_file *fp;
59
60 /*
61 * See if the user has specified an explicit kernel to boot.
62 */
63 if ((argc > 1) && (argv[1][0] != '-')) {
64
65 /* XXX maybe we should discard everything and start again? */
66 if (file_findfile(NULL, NULL) != NULL) {
67 snprintf(command_errbuf, sizeof(command_errbuf),
68 "can't boot '%s', kernel module already loaded", argv[1]);
69 return(CMD_ERROR);
70 }
71
72 /* find/load the kernel module */
73 if (mod_loadkld(argv[1], argc - 2, argv + 2) != 0)
74 return(CMD_ERROR);
75 /* we have consumed all arguments */
76 argc = 1;
77 }
78
79 /*
80 * See if there is a kernel module already loaded
81 */
82 if (file_findfile(NULL, NULL) == NULL)
83 if (loadakernel(0, argc - 1, argv + 1))
84 /* we have consumed all arguments */
85 argc = 1;
86
87 /*
88 * Loaded anything yet?
89 */
90 if ((fp = file_findfile(NULL, NULL)) == NULL) {
91 command_errmsg = "no bootable kernel";
92 return(CMD_ERROR);
93 }
94
95 /*
96 * If we were given arguments, discard any previous.
97 * XXX should we merge arguments? Hard to DWIM.
98 */
99 if (argc > 1) {
100 if (fp->f_args != NULL)
101 free(fp->f_args);
102 fp->f_args = unargv(argc - 1, argv + 1);
103 }
104
105 /* Hook for platform-specific autoloading of modules */
106 if (archsw.arch_autoload() != 0)
107 return(CMD_ERROR);
108
109 /* Call the exec handler from the loader matching the kernel */
110 file_formats[fp->f_loader]->l_exec(fp);
111 return(CMD_ERROR);
112 }
113
114
115 /*
116 * Autoboot after a delay
117 */
118
119 COMMAND_SET(autoboot, "autoboot", "boot automatically after a delay", command_autoboot);
120
121 static int
command_autoboot(int argc,char * argv[])122 command_autoboot(int argc, char *argv[])
123 {
124 int howlong;
125 char *cp, *prompt;
126
127 prompt = NULL;
128 howlong = -1;
129 switch(argc) {
130 case 3:
131 prompt = argv[2];
132 /* FALLTHROUGH */
133 case 2:
134 howlong = strtol(argv[1], &cp, 0);
135 if (*cp != 0) {
136 snprintf(command_errbuf, sizeof(command_errbuf),
137 "bad delay '%s'", argv[1]);
138 return(CMD_ERROR);
139 }
140 /* FALLTHROUGH */
141 case 1:
142 return(autoboot(howlong, prompt));
143 }
144
145 command_errmsg = "too many arguments";
146 return(CMD_ERROR);
147 }
148
149 /*
150 * Called before we go interactive. If we think we can autoboot, and
151 * we haven't tried already, try now.
152 */
153 void
autoboot_maybe()154 autoboot_maybe()
155 {
156 char *cp;
157
158 cp = getenv("autoboot_delay");
159 if ((autoboot_tried == 0) && ((cp == NULL) || strcasecmp(cp, "NO")))
160 autoboot(-1, NULL); /* try to boot automatically */
161 }
162
163 static int
autoboot(int timeout,char * prompt)164 autoboot(int timeout, char *prompt)
165 {
166 time_t when, otime, ntime;
167 int c, yes;
168 char *argv[2], *cp, *ep;
169 char *kernelname;
170 #ifdef BOOT_PROMPT_123
171 const char *seq = "123", *p = seq;
172 #endif
173
174 autoboot_tried = 1;
175
176 if (timeout == -1) {
177 timeout = 10;
178 /* try to get a delay from the environment */
179 if ((cp = getenv("autoboot_delay"))) {
180 timeout = strtol(cp, &ep, 0);
181 if (cp == ep)
182 timeout = 10; /* Unparseable? Set default! */
183 }
184 }
185
186 kernelname = getenv("kernelname");
187 if (kernelname == NULL) {
188 argv[0] = NULL;
189 loadakernel(0, 0, argv);
190 kernelname = getenv("kernelname");
191 if (kernelname == NULL) {
192 command_errmsg = "no valid kernel found";
193 return(CMD_ERROR);
194 }
195 }
196
197 if (timeout >= 0) {
198 otime = time(NULL);
199 when = otime + timeout; /* when to boot */
200
201 yes = 0;
202
203 #ifdef BOOT_PROMPT_123
204 printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or "
205 "1 2 3 sequence for command prompt." : prompt);
206 #else
207 printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or any other key for command prompt." : prompt);
208 #endif
209
210 for (;;) {
211 if (ischar()) {
212 c = getchar();
213 #ifdef BOOT_PROMPT_123
214 if ((c == '\r') || (c == '\n')) {
215 yes = 1;
216 break;
217 } else if (c != *p++)
218 p = seq;
219 if (*p == 0)
220 break;
221 #else
222 if ((c == '\r') || (c == '\n'))
223 yes = 1;
224 break;
225 #endif
226 }
227 ntime = time(NULL);
228 if (ntime >= when) {
229 yes = 1;
230 break;
231 }
232
233 if (ntime != otime) {
234 printf("\rBooting [%s] in %d second%s... ",
235 kernelname, (int)(when - ntime),
236 (when-ntime)==1?"":"s");
237 otime = ntime;
238 }
239 }
240 } else {
241 yes = 1;
242 }
243
244 if (yes)
245 printf("\rBooting [%s]... ", kernelname);
246 putchar('\n');
247 if (yes) {
248 argv[0] = "boot";
249 argv[1] = NULL;
250 return(command_boot(1, argv));
251 }
252 return(CMD_OK);
253 }
254
255 /*
256 * Scrounge for the name of the (try)'th file we will try to boot.
257 */
258 static char *
getbootfile(int try)259 getbootfile(int try)
260 {
261 static char *name = NULL;
262 const char *spec, *ep;
263 size_t len;
264
265 /* we use dynamic storage */
266 if (name != NULL) {
267 free(name);
268 name = NULL;
269 }
270
271 /*
272 * Try $bootfile, then try our builtin default
273 */
274 if ((spec = getenv("bootfile")) == NULL)
275 spec = default_bootfiles;
276
277 while ((try > 0) && (spec != NULL)) {
278 spec = strchr(spec, ';');
279 if (spec)
280 spec++; /* skip over the leading ';' */
281 try--;
282 }
283 if (spec != NULL) {
284 if ((ep = strchr(spec, ';')) != NULL) {
285 len = ep - spec;
286 } else {
287 len = strlen(spec);
288 }
289 name = malloc(len + 1);
290 strncpy(name, spec, len);
291 name[len] = 0;
292 }
293 if (name && name[0] == 0) {
294 free(name);
295 name = NULL;
296 }
297 return(name);
298 }
299
300 /*
301 * Try to find the /etc/fstab file on the filesystem (rootdev),
302 * which should be be the root filesystem, and parse it to find
303 * out what the kernel ought to think the root filesystem is.
304 *
305 * If we're successful, set vfs.root.mountfrom to <vfstype>:<path>
306 * so that the kernel can tell both which VFS and which node to use
307 * to mount the device. If this variable's already set, don't
308 * overwrite it.
309 */
310 int
getrootmount(char * rootdev)311 getrootmount(char *rootdev)
312 {
313 char lbuf[128], *cp, *ep, *dev, *fstyp, *options;
314 int fd, error;
315
316 if (getenv("vfs.root.mountfrom") != NULL)
317 return(0);
318
319 error = 1;
320 sprintf(lbuf, "%s/etc/fstab", rootdev);
321 if ((fd = open(lbuf, O_RDONLY)) < 0)
322 goto notfound;
323
324 /* loop reading lines from /etc/fstab What was that about sscanf again? */
325 fstyp = NULL;
326 dev = NULL;
327 while (fgetstr(lbuf, sizeof(lbuf), fd) >= 0) {
328 if ((lbuf[0] == 0) || (lbuf[0] == '#'))
329 continue;
330
331 /* skip device name */
332 for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++)
333 ;
334 if (*cp == 0) /* misformatted */
335 continue;
336 /* delimit and save */
337 *cp++ = 0;
338 free(dev);
339 dev = strdup(lbuf);
340
341 /* skip whitespace up to mountpoint */
342 while ((*cp != 0) && isspace(*cp))
343 cp++;
344 /* must have /<space> to be root */
345 if ((*cp == 0) || (*cp != '/') || !isspace(*(cp + 1)))
346 continue;
347 /* skip whitespace up to fstype */
348 cp += 2;
349 while ((*cp != 0) && isspace(*cp))
350 cp++;
351 if (*cp == 0) /* misformatted */
352 continue;
353 /* skip text to end of fstype and delimit */
354 ep = cp;
355 while ((*cp != 0) && !isspace(*cp))
356 cp++;
357 *cp = 0;
358 free(fstyp);
359 fstyp = strdup(ep);
360
361 /* skip whitespace up to mount options */
362 cp += 1;
363 while ((*cp != 0) && isspace(*cp))
364 cp++;
365 if (*cp == 0) /* misformatted */
366 continue;
367 /* skip text to end of mount options and delimit */
368 ep = cp;
369 while ((*cp != 0) && !isspace(*cp))
370 cp++;
371 *cp = 0;
372 options = strdup(ep);
373 /* Build the <fstype>:<device> and save it in vfs.root.mountfrom */
374 sprintf(lbuf, "%s:%s", fstyp, dev);
375 setenv("vfs.root.mountfrom", lbuf, 0);
376
377 /* Don't override vfs.root.mountfrom.options if it is already set */
378 if (getenv("vfs.root.mountfrom.options") == NULL) {
379 /* save mount options */
380 setenv("vfs.root.mountfrom.options", options, 0);
381 }
382 free(options);
383 error = 0;
384 break;
385 }
386 close(fd);
387 free(dev);
388 free(fstyp);
389
390 notfound:
391 if (error) {
392 const char *currdev;
393
394 currdev = getenv("currdev");
395 if (currdev != NULL && strncmp("zfs:", currdev, 4) == 0) {
396 cp = strdup(currdev);
397 cp[strlen(cp) - 1] = '\0';
398 setenv("vfs.root.mountfrom", cp, 0);
399 error = 0;
400 free(cp);
401 }
402 }
403
404 return(error);
405 }
406
407 static int
loadakernel(int try,int argc,char * argv[])408 loadakernel(int try, int argc, char* argv[])
409 {
410 char *cp;
411
412 for (try = 0; (cp = getbootfile(try)) != NULL; try++)
413 if (mod_loadkld(cp, argc - 1, argv + 1) != 0)
414 printf("can't load '%s'\n", cp);
415 else
416 return 1;
417 return 0;
418 }
419