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 #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 #ifdef LOADER_VERIEXEC
110 verify_pcr_export(); /* for measured boot */
111 #ifdef LOADER_VERIEXEC_PASS_MANIFEST
112 pass_manifest_export_envs();
113 #endif
114 #endif
115
116 /* Pass the tslog buffer to the kernel as a preloaded module. */
117 tslog_publish();
118
119 /* Call the exec handler from the loader matching the kernel */
120 file_formats[fp->f_loader]->l_exec(fp);
121 return(CMD_ERROR);
122 }
123
124
125 /*
126 * Autoboot after a delay
127 */
128
129 COMMAND_SET(autoboot, "autoboot", "boot automatically after a delay", command_autoboot);
130
131 static int
command_autoboot(int argc,char * argv[])132 command_autoboot(int argc, char *argv[])
133 {
134 int howlong;
135 char *cp, *prompt;
136
137 prompt = NULL;
138 howlong = -1;
139 switch(argc) {
140 case 3:
141 prompt = argv[2];
142 /* FALLTHROUGH */
143 case 2:
144 howlong = strtol(argv[1], &cp, 0);
145 if (*cp != 0) {
146 snprintf(command_errbuf, sizeof(command_errbuf),
147 "bad delay '%s'", argv[1]);
148 return(CMD_ERROR);
149 }
150 /* FALLTHROUGH */
151 case 1:
152 return(autoboot(howlong, prompt));
153 }
154
155 command_errmsg = "too many arguments";
156 return(CMD_ERROR);
157 }
158
159 /*
160 * Called before we go interactive. If we think we can autoboot, and
161 * we haven't tried already, try now.
162 */
163 void
autoboot_maybe()164 autoboot_maybe()
165 {
166 char *cp;
167
168 cp = getenv("autoboot_delay");
169 if ((autoboot_tried == 0) && ((cp == NULL) || strcasecmp(cp, "NO")))
170 autoboot(-1, NULL); /* try to boot automatically */
171 }
172
173 static int
autoboot(int timeout,char * prompt)174 autoboot(int timeout, char *prompt)
175 {
176 time_t when, otime, ntime;
177 int c, yes;
178 char *argv[2], *cp, *ep;
179 char *kernelname;
180 #ifdef BOOT_PROMPT_123
181 const char *seq = "123", *p = seq;
182 #endif
183
184 autoboot_tried = 1;
185
186 if (timeout == -1) {
187 timeout = 10;
188 /* try to get a delay from the environment */
189 if ((cp = getenv("autoboot_delay"))) {
190 timeout = strtol(cp, &ep, 0);
191 if (cp == ep)
192 timeout = 10; /* Unparseable? Set default! */
193 }
194 }
195
196 kernelname = getenv("kernelname");
197 if (kernelname == NULL) {
198 argv[0] = NULL;
199 loadakernel(0, 0, argv);
200 kernelname = getenv("kernelname");
201 if (kernelname == NULL) {
202 command_errmsg = "no valid kernel found";
203 return(CMD_ERROR);
204 }
205 }
206
207 if (timeout >= 0) {
208 otime = -1;
209 ntime = time(NULL);
210 when = ntime + timeout; /* when to boot */
211
212 yes = 0;
213
214 #ifdef BOOT_PROMPT_123
215 printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or "
216 "1 2 3 sequence for command prompt." : prompt);
217 #else
218 printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or any other key for command prompt." : prompt);
219 #endif
220
221 for (;;) {
222 if (ischar()) {
223 c = getchar();
224 #ifdef BOOT_PROMPT_123
225 if ((c == '\r') || (c == '\n')) {
226 yes = 1;
227 break;
228 } else if (c != *p++)
229 p = seq;
230 if (*p == 0)
231 break;
232 #else
233 if ((c == '\r') || (c == '\n'))
234 yes = 1;
235 break;
236 #endif
237 }
238 ntime = time(NULL);
239 if (ntime >= when) {
240 yes = 1;
241 break;
242 }
243
244 if (ntime != otime) {
245 printf("\rBooting [%s] in %d second%s... ",
246 kernelname, (int)(when - ntime),
247 (when-ntime)==1?"":"s");
248 otime = ntime;
249 }
250 }
251 } else {
252 yes = 1;
253 }
254
255 if (yes)
256 printf("\rBooting [%s]... ", kernelname);
257 putchar('\n');
258 if (yes) {
259 argv[0] = "boot";
260 argv[1] = NULL;
261 return(command_boot(1, argv));
262 }
263 return(CMD_OK);
264 }
265
266 /*
267 * Scrounge for the name of the (try)'th file we will try to boot.
268 */
269 static char *
getbootfile(int try)270 getbootfile(int try)
271 {
272 static char *name = NULL;
273 const char *spec, *ep;
274 size_t len;
275
276 /* we use dynamic storage */
277 if (name != NULL) {
278 free(name);
279 name = NULL;
280 }
281
282 /*
283 * Try $bootfile, then try our builtin default
284 */
285 if ((spec = getenv("bootfile")) == NULL)
286 spec = default_bootfiles;
287
288 while ((try > 0) && (spec != NULL)) {
289 spec = strchr(spec, ';');
290 if (spec)
291 spec++; /* skip over the leading ';' */
292 try--;
293 }
294 if (spec != NULL) {
295 if ((ep = strchr(spec, ';')) != NULL) {
296 len = ep - spec;
297 } else {
298 len = strlen(spec);
299 }
300 name = malloc(len + 1);
301 strncpy(name, spec, len);
302 name[len] = 0;
303 }
304 if (name && name[0] == 0) {
305 free(name);
306 name = NULL;
307 }
308 return(name);
309 }
310
311 /*
312 * Try to find the /etc/fstab file on the filesystem (rootdev),
313 * which should be be the root filesystem, and parse it to find
314 * out what the kernel ought to think the root filesystem is.
315 *
316 * If we're successful, set vfs.root.mountfrom to <vfstype>:<path>
317 * so that the kernel can tell both which VFS and which node to use
318 * to mount the device. If this variable's already set, don't
319 * overwrite it.
320 */
321 int
getrootmount(char * rootdev)322 getrootmount(char *rootdev)
323 {
324 char lbuf[128], *cp, *ep, *dev, *fstyp, *options;
325 int fd, error;
326
327 if (getenv("vfs.root.mountfrom") != NULL)
328 return(0);
329
330 error = 1;
331 sprintf(lbuf, "%s/etc/fstab", rootdev);
332 if ((fd = open(lbuf, O_RDONLY)) < 0)
333 goto notfound;
334
335 /* loop reading lines from /etc/fstab What was that about sscanf again? */
336 fstyp = NULL;
337 dev = NULL;
338 while (fgetstr(lbuf, sizeof(lbuf), fd) >= 0) {
339 if ((lbuf[0] == 0) || (lbuf[0] == '#'))
340 continue;
341
342 /* skip device name */
343 for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++)
344 ;
345 if (*cp == 0) /* misformatted */
346 continue;
347 /* delimit and save */
348 *cp++ = 0;
349 free(dev);
350 dev = strdup(lbuf);
351
352 /* skip whitespace up to mountpoint */
353 while ((*cp != 0) && isspace(*cp))
354 cp++;
355 /* must have /<space> to be root */
356 if ((*cp == 0) || (*cp != '/') || !isspace(*(cp + 1)))
357 continue;
358 /* skip whitespace up to fstype */
359 cp += 2;
360 while ((*cp != 0) && isspace(*cp))
361 cp++;
362 if (*cp == 0) /* misformatted */
363 continue;
364 /* skip text to end of fstype and delimit */
365 ep = cp;
366 while ((*cp != 0) && !isspace(*cp))
367 cp++;
368 *cp = 0;
369 free(fstyp);
370 fstyp = strdup(ep);
371
372 /* skip whitespace up to mount options */
373 cp += 1;
374 while ((*cp != 0) && isspace(*cp))
375 cp++;
376 if (*cp == 0) /* misformatted */
377 continue;
378 /* skip text to end of mount options and delimit */
379 ep = cp;
380 while ((*cp != 0) && !isspace(*cp))
381 cp++;
382 *cp = 0;
383 options = strdup(ep);
384 /* Build the <fstype>:<device> and save it in vfs.root.mountfrom */
385 sprintf(lbuf, "%s:%s", fstyp, dev);
386 setenv("vfs.root.mountfrom", lbuf, 0);
387
388 /* Don't override vfs.root.mountfrom.options if it is already set */
389 if (getenv("vfs.root.mountfrom.options") == NULL) {
390 /* save mount options */
391 setenv("vfs.root.mountfrom.options", options, 0);
392 }
393 free(options);
394 error = 0;
395 break;
396 }
397 close(fd);
398 free(dev);
399 free(fstyp);
400
401 notfound:
402 if (error) {
403 const char *currdev;
404
405 currdev = getenv("currdev");
406 if (currdev != NULL && strncmp("zfs:", currdev, 4) == 0) {
407 cp = strdup(currdev);
408 cp[strlen(cp) - 1] = '\0';
409 setenv("vfs.root.mountfrom", cp, 0);
410 error = 0;
411 free(cp);
412 }
413 }
414
415 return(error);
416 }
417
418 static int
loadakernel(int try,int argc,char * argv[])419 loadakernel(int try, int argc, char* argv[])
420 {
421 char *cp;
422
423 for (try = 0; (cp = getbootfile(try)) != NULL; try++)
424 if (mod_loadkld(cp, argc - 1, argv + 1) != 0)
425 printf("can't load '%s'\n", cp);
426 else
427 return 1;
428 return 0;
429 }
430