xref: /freebsd/sbin/fsck/fsck.c (revision a0409676120c1e558d0ade943019934e0f15118d) 
1 /*	$NetBSD: fsck.c,v 1.30 2003/08/07 10:04:15 agc Exp $	*/
2 
3 /*-
4  * SPDX-License-Identifier: BSD-3-Clause
5  *
6  * Copyright (c) 1996 Christos Zoulas. All rights reserved.
7  * Copyright (c) 1980, 1989, 1993, 1994
8  *	The Regents of the University of California.  All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  *
34  * From: @(#)mount.c	8.19 (Berkeley) 4/19/94
35  * From: $NetBSD: mount.c,v 1.24 1995/11/18 03:34:29 cgd Exp
36  * $NetBSD: fsck.c,v 1.30 2003/08/07 10:04:15 agc Exp $
37  */
38 
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
41 
42 #include <sys/param.h>
43 #include <sys/mount.h>
44 #include <sys/queue.h>
45 #include <sys/wait.h>
46 #include <sys/disk.h>
47 #include <sys/ioctl.h>
48 
49 #include <ctype.h>
50 #include <err.h>
51 #include <fstab.h>
52 #include <fcntl.h>
53 #include <paths.h>
54 #include <signal.h>
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <string.h>
58 #include <unistd.h>
59 
60 #include "fsutil.h"
61 
62 static enum { IN_LIST, NOT_IN_LIST } which = NOT_IN_LIST;
63 
64 static TAILQ_HEAD(fstypelist, entry) opthead, selhead;
65 
66 struct entry {
67 	char *type;
68 	char *options;
69 	TAILQ_ENTRY(entry) entries;
70 };
71 
72 static char *options = NULL;
73 static int flags = 0;
74 static int forceflag = 0;
75 
76 static int checkfs(const char *, const char *, const char *, const char *, pid_t *);
77 static int selected(const char *);
78 static void addoption(char *);
79 static const char *getoptions(const char *);
80 static void addentry(struct fstypelist *, const char *, const char *);
81 static void maketypelist(char *);
82 static void catopt(char **, const char *);
83 static void mangle(char *, int *, const char ** volatile *, int *);
84 static const char *getfstype(const char *);
85 static void usage(void) __dead2;
86 static int isok(struct fstab *);
87 
88 static struct {
89 	const char *ptype;
90 	const char *name;
91 } ptype_map[] = {
92 	{ "ufs",	"ffs" },
93 	{ "ffs",	"ffs" },
94 	{ "fat",	"msdosfs" },
95 	{ "efi",	"msdosfs" },
96 	{ NULL,		NULL },
97 };
98 
99 int
100 main(int argc, char *argv[])
101 {
102 	struct fstab *fs;
103 	int i, rval = 0;
104 	const char *vfstype = NULL;
105 	char globopt[3];
106 	const char *etc_fstab;
107 
108 	globopt[0] = '-';
109 	globopt[2] = '\0';
110 
111 	TAILQ_INIT(&selhead);
112 	TAILQ_INIT(&opthead);
113 
114 	etc_fstab = NULL;
115 	while ((i = getopt(argc, argv, "BCdvpfFnyl:t:T:c:")) != -1)
116 		switch (i) {
117 		case 'B':
118 			if (flags & CHECK_BACKGRD)
119 				errx(1, "Cannot specify -B and -F.");
120 			flags |= DO_BACKGRD;
121 			break;
122 
123 		case 'd':
124 			flags |= CHECK_DEBUG;
125 			break;
126 
127 		case 'v':
128 			flags |= CHECK_VERBOSE;
129 			break;
130 
131 		case 'F':
132 			if (flags & DO_BACKGRD)
133 				errx(1, "Cannot specify -B and -F.");
134 			flags |= CHECK_BACKGRD;
135 			break;
136 
137 		case 'p':
138 			flags |= CHECK_PREEN;
139 			/*FALLTHROUGH*/
140 		case 'C':
141 			flags |= CHECK_CLEAN;
142 			/*FALLTHROUGH*/
143 		case 'n':
144 		case 'y':
145 			globopt[1] = i;
146 			catopt(&options, globopt);
147 			break;
148 
149 		case 'f':
150 			forceflag = 1;
151 			globopt[1] = i;
152 			catopt(&options, globopt);
153 			break;
154 
155 		case 'l':
156 			warnx("Ignoring obsolete -l option\n");
157 			break;
158 
159 		case 'T':
160 			if (*optarg)
161 				addoption(optarg);
162 			break;
163 
164 		case 't':
165 			if (!TAILQ_EMPTY(&selhead))
166 				errx(1, "only one -t option may be specified.");
167 
168 			maketypelist(optarg);
169 			vfstype = optarg;
170 			break;
171 
172 		case 'c':
173 			etc_fstab = optarg;
174 			break;
175 
176 		case '?':
177 		default:
178 			usage();
179 			/* NOTREACHED */
180 		}
181 
182 	argc -= optind;
183 	argv += optind;
184 
185 	if (etc_fstab != NULL)
186 		setfstab(etc_fstab);
187 
188 	if (argc == 0)
189 		return checkfstab(flags, isok, checkfs);
190 
191 #define	BADTYPE(type)							\
192 	(strcmp(type, FSTAB_RO) &&					\
193 	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
194 
195 
196 	for (; argc--; argv++) {
197 		const char *spec, *mntpt, *type, *cp;
198 		char device[MAXPATHLEN];
199 		struct statfs *mntp;
200 
201 		mntpt = NULL;
202 		spec = *argv;
203 		cp = strrchr(spec, '/');
204 		if (cp == NULL) {
205 			(void)snprintf(device, sizeof(device), "%s%s",
206 				_PATH_DEV, spec);
207 			spec = device;
208 		}
209 		mntp = getmntpt(spec);
210 		if (mntp != NULL) {
211 			spec = mntp->f_mntfromname;
212 			mntpt = mntp->f_mntonname;
213 		}
214 		if ((fs = getfsfile(spec)) == NULL &&
215 		    (fs = getfsspec(spec)) == NULL) {
216 			if (vfstype == NULL)
217 				vfstype = getfstype(spec);
218 			if (vfstype == NULL)
219 				vfstype = "ufs";
220 			type = vfstype;
221 			devcheck(spec);
222 		} else {
223 			spec = fs->fs_spec;
224 			type = fs->fs_vfstype;
225 			mntpt = fs->fs_file;
226 			if (BADTYPE(fs->fs_type))
227 				errx(1, "%s has unknown file system type.",
228 				    spec);
229 		}
230 		if ((flags & CHECK_BACKGRD) &&
231 		    checkfs(type, spec, mntpt, "-F", NULL) == 0) {
232 			printf("%s: DEFER FOR BACKGROUND CHECKING\n", *argv);
233 			continue;
234 		}
235 		if ((flags & DO_BACKGRD) && forceflag == 0 &&
236 		    checkfs(type, spec, mntpt, "-F", NULL) != 0)
237 			continue;
238 
239 		rval |= checkfs(type, spec, mntpt, NULL, NULL);
240 	}
241 
242 	return rval;
243 }
244 
245 
246 static int
247 isok(struct fstab *fs)
248 {
249 	int i;
250 
251 	if (fs->fs_passno == 0)
252 		return (0);
253 	if (BADTYPE(fs->fs_type))
254 		return (0);
255 	if (!selected(fs->fs_vfstype))
256 		return (0);
257 	/*
258 	 * If the -B flag has been given, then process the needed
259 	 * background checks. Background checks cannot be run on
260 	 * file systems that will be mounted read-only or that were
261 	 * not mounted at boot time (typically those marked `noauto').
262 	 * If these basic tests are passed, check with the file system
263 	 * itself to see if it is willing to do background checking
264 	 * by invoking its check program with the -F flag.
265 	 */
266 	if (flags & DO_BACKGRD) {
267 		if (!strcmp(fs->fs_type, FSTAB_RO))
268 			return (0);
269 		if (getmntpt(fs->fs_spec) == NULL)
270 			return (0);
271 		if (checkfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, "-F", 0))
272 			return (0);
273 		return (1);
274 	}
275 	/*
276 	 * If the -F flag has been given, then consider deferring the
277 	 * check to background. Background checks cannot be run on
278 	 * file systems that will be mounted read-only or that will
279 	 * not be mounted at boot time (e.g., marked `noauto'). If
280 	 * these basic tests are passed, check with the file system
281 	 * itself to see if it is willing to defer to background
282 	 * checking by invoking its check program with the -F flag.
283 	 */
284 	if ((flags & CHECK_BACKGRD) == 0 || !strcmp(fs->fs_type, FSTAB_RO))
285 		return (1);
286 	for (i = strlen(fs->fs_mntops) - 6; i >= 0; i--)
287 		if (!strncmp(&fs->fs_mntops[i], "noauto", 6))
288 			break;
289 	if (i >= 0)
290 		return (1);
291 	if (checkfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, "-F", NULL) != 0)
292 		return (1);
293 	printf("%s: DEFER FOR BACKGROUND CHECKING\n", fs->fs_spec);
294 	return (0);
295 }
296 
297 
298 static int
299 checkfs(const char *pvfstype, const char *spec, const char *mntpt,
300     const char *auxopt, pid_t *pidp)
301 {
302 	const char ** volatile argv;
303 	pid_t pid;
304 	int argc, i, status, maxargc;
305 	char *optbuf, execbase[MAXPATHLEN];
306 	char *vfstype = NULL;
307 	const char *extra = NULL;
308 
309 #ifdef __GNUC__
310 	/* Avoid vfork clobbering */
311 	(void) &optbuf;
312 	(void) &vfstype;
313 #endif
314 	/*
315 	 * We convert the vfstype to lowercase and any spaces to underscores
316 	 * to not confuse the issue
317 	 *
318 	 * XXX This is a kludge to make automatic filesystem type guessing
319 	 * from the disklabel work for "4.2BSD" filesystems.  It does a
320 	 * very limited subset of transliteration to a normalised form of
321 	 * filesystem name, and we do not seem to enforce a filesystem
322 	 * name character set.
323 	 */
324 	vfstype = strdup(pvfstype);
325 	if (vfstype == NULL)
326 		perr("strdup(pvfstype)");
327 	for (i = 0; i < (int)strlen(vfstype); i++) {
328 		vfstype[i] = tolower(vfstype[i]);
329 		if (vfstype[i] == ' ')
330 			vfstype[i] = '_';
331 	}
332 
333 	extra = getoptions(vfstype);
334 	optbuf = NULL;
335 	if (options)
336 		catopt(&optbuf, options);
337 	if (extra)
338 		catopt(&optbuf, extra);
339 	if (auxopt)
340 		catopt(&optbuf, auxopt);
341 	else if (flags & DO_BACKGRD)
342 		catopt(&optbuf, "-B");
343 
344 	maxargc = 64;
345 	argv = emalloc(sizeof(char *) * maxargc);
346 
347 	(void) snprintf(execbase, sizeof(execbase), "fsck_%s", vfstype);
348 	argc = 0;
349 	argv[argc++] = execbase;
350 	if (optbuf)
351 		mangle(optbuf, &argc, &argv, &maxargc);
352 	argv[argc++] = spec;
353 	argv[argc] = NULL;
354 
355 	if (flags & (CHECK_DEBUG|CHECK_VERBOSE)) {
356 		(void)printf("start %s %swait", mntpt,
357 			pidp ? "no" : "");
358 		for (i = 0; i < argc; i++)
359 			(void)printf(" %s", argv[i]);
360 		(void)printf("\n");
361 	}
362 
363 	switch (pid = vfork()) {
364 	case -1:				/* Error. */
365 		warn("vfork");
366 		if (optbuf)
367 			free(optbuf);
368 		free(vfstype);
369 		return (1);
370 
371 	case 0:					/* Child. */
372 		if ((flags & CHECK_DEBUG) && auxopt == NULL)
373 			_exit(0);
374 
375 		/* Go find an executable. */
376 		execvP(execbase, _PATH_SYSPATH, __DECONST(char * const *, argv));
377 		if (spec)
378 			warn("exec %s for %s in %s", execbase, spec, _PATH_SYSPATH);
379 		else
380 			warn("exec %s in %s", execbase, _PATH_SYSPATH);
381 		_exit(1);
382 		/* NOTREACHED */
383 
384 	default:				/* Parent. */
385 		if (optbuf)
386 			free(optbuf);
387 
388 		free(vfstype);
389 
390 		if (pidp) {
391 			*pidp = pid;
392 			return 0;
393 		}
394 
395 		if (waitpid(pid, &status, 0) < 0) {
396 			warn("waitpid");
397 			return (1);
398 		}
399 
400 		if (WIFEXITED(status)) {
401 			if (WEXITSTATUS(status) != 0)
402 				return (WEXITSTATUS(status));
403 		}
404 		else if (WIFSIGNALED(status)) {
405 			warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
406 			return (1);
407 		}
408 		break;
409 	}
410 
411 	return (0);
412 }
413 
414 
415 static int
416 selected(const char *type)
417 {
418 	struct entry *e;
419 
420 	/* If no type specified, it's always selected. */
421 	TAILQ_FOREACH(e, &selhead, entries)
422 		if (!strncmp(e->type, type, MFSNAMELEN))
423 			return which == IN_LIST ? 1 : 0;
424 
425 	return which == IN_LIST ? 0 : 1;
426 }
427 
428 
429 static const char *
430 getoptions(const char *type)
431 {
432 	struct entry *e;
433 
434 	TAILQ_FOREACH(e, &opthead, entries)
435 		if (!strncmp(e->type, type, MFSNAMELEN))
436 			return e->options;
437 	return "";
438 }
439 
440 
441 static void
442 addoption(char *optstr)
443 {
444 	char *newoptions;
445 	struct entry *e;
446 
447 	if ((newoptions = strchr(optstr, ':')) == NULL)
448 		errx(1, "Invalid option string");
449 
450 	*newoptions++ = '\0';
451 
452 	TAILQ_FOREACH(e, &opthead, entries)
453 		if (!strncmp(e->type, optstr, MFSNAMELEN)) {
454 			catopt(&e->options, newoptions);
455 			return;
456 		}
457 	addentry(&opthead, optstr, newoptions);
458 }
459 
460 
461 static void
462 addentry(struct fstypelist *list, const char *type, const char *opts)
463 {
464 	struct entry *e;
465 
466 	e = emalloc(sizeof(struct entry));
467 	e->type = estrdup(type);
468 	e->options = estrdup(opts);
469 	TAILQ_INSERT_TAIL(list, e, entries);
470 }
471 
472 
473 static void
474 maketypelist(char *fslist)
475 {
476 	char *ptr;
477 
478 	if ((fslist == NULL) || (fslist[0] == '\0'))
479 		errx(1, "empty type list");
480 
481 	if (fslist[0] == 'n' && fslist[1] == 'o') {
482 		fslist += 2;
483 		which = NOT_IN_LIST;
484 	}
485 	else
486 		which = IN_LIST;
487 
488 	while ((ptr = strsep(&fslist, ",")) != NULL)
489 		addentry(&selhead, ptr, "");
490 
491 }
492 
493 
494 static void
495 catopt(char **sp, const char *o)
496 {
497 	char *s;
498 	size_t i, j;
499 
500 	s = *sp;
501 	if (s) {
502 		i = strlen(s);
503 		j = i + 1 + strlen(o) + 1;
504 		s = erealloc(s, j);
505 		(void)snprintf(s + i, j, ",%s", o);
506 	} else
507 		s = estrdup(o);
508 	*sp = s;
509 }
510 
511 
512 static void
513 mangle(char *opts, int *argcp, const char ** volatile *argvp, int *maxargcp)
514 {
515 	char *p, *s;
516 	int argc, maxargc;
517 	const char **argv;
518 
519 	argc = *argcp;
520 	argv = *argvp;
521 	maxargc = *maxargcp;
522 
523 	for (s = opts; (p = strsep(&s, ",")) != NULL;) {
524 		/* Always leave space for one more argument and the NULL. */
525 		if (argc >= maxargc - 3) {
526 			maxargc <<= 1;
527 			argv = erealloc(argv, maxargc * sizeof(char *));
528 		}
529 		if (*p != '\0')  {
530 			if (*p == '-') {
531 				argv[argc++] = p;
532 				p = strchr(p, '=');
533 				if (p) {
534 					*p = '\0';
535 					argv[argc++] = p+1;
536 				}
537 			} else {
538 				argv[argc++] = "-o";
539 				argv[argc++] = p;
540 			}
541 		}
542 	}
543 
544 	*argcp = argc;
545 	*argvp = argv;
546 	*maxargcp = maxargc;
547 }
548 
549 static const char *
550 getfstype(const char *str)
551 {
552 	struct diocgattr_arg attr;
553 	int fd, i;
554 
555 	if ((fd = open(str, O_RDONLY)) == -1)
556 		err(1, "cannot open `%s'", str);
557 
558 	strncpy(attr.name, "PART::type", sizeof(attr.name));
559 	memset(&attr.value, 0, sizeof(attr.value));
560 	attr.len = sizeof(attr.value);
561 	if (ioctl(fd, DIOCGATTR, &attr) == -1) {
562 		(void) close(fd);
563 		return(NULL);
564 	}
565 	(void) close(fd);
566 	for (i = 0; ptype_map[i].ptype != NULL; i++)
567 		if (strstr(attr.value.str, ptype_map[i].ptype) != NULL)
568 			return (ptype_map[i].name);
569 	return (NULL);
570 }
571 
572 
573 static void
574 usage(void)
575 {
576 	static const char common[] =
577 	    "[-Cdfnpvy] [-B | -F] [-T fstype:fsoptions] [-t fstype] [-c fstab]";
578 
579 	(void)fprintf(stderr, "usage: %s %s [special | node] ...\n",
580 	    getprogname(), common);
581 	exit(1);
582 }
583