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utilities.c revision 1.17 
      1 /*	$NetBSD: utilities.c,v 1.17 2003/08/07 10:04:38 agc Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)utilities.c	8.5 (Berkeley) 4/28/95";
     36 #else
     37 __RCSID("$NetBSD: utilities.c,v 1.17 2003/08/07 10:04:38 agc Exp $");
     38 #endif
     39 #endif /* not lint */
     40 
     41 #include <sys/param.h>
     42 #include <sys/stat.h>
     43 
     44 #include <ufs/ufs/dinode.h>
     45 #include <ufs/ufs/dir.h>
     46 
     47 #include <errno.h>
     48 #include <stdio.h>
     49 #include <stdlib.h>
     50 #include <string.h>
     51 #include <unistd.h>
     52 
     53 #include "restore.h"
     54 #include "extern.h"
     55 
     56 /*
     57  * Insure that all the components of a pathname exist.
     58  */
     59 void
     60 pathcheck(name)
     61 	char *name;
     62 {
     63 	char *cp;
     64 	struct entry *ep;
     65 	char *start;
     66 
     67 	start = strchr(name, '/');
     68 	if (start == 0)
     69 		return;
     70 	for (cp = start; *cp != '\0'; cp++) {
     71 		if (*cp != '/')
     72 			continue;
     73 		*cp = '\0';
     74 		ep = lookupname(name);
     75 		if (ep == NULL) {
     76 			/* Safe; we know the pathname exists in the dump. */
     77 			ep = addentry(name, pathsearch(name)->d_ino, NODE);
     78 			newnode(ep);
     79 		}
     80 		ep->e_flags |= NEW|KEEP;
     81 		*cp = '/';
     82 	}
     83 }
     84 
     85 /*
     86  * Change a name to a unique temporary name.
     87  */
     88 void
     89 mktempname(ep)
     90 	struct entry *ep;
     91 {
     92 	char oldname[MAXPATHLEN];
     93 
     94 	if (ep->e_flags & TMPNAME)
     95 		badentry(ep, "mktempname: called with TMPNAME");
     96 	ep->e_flags |= TMPNAME;
     97 	(void) strcpy(oldname, myname(ep));
     98 	freename(ep->e_name);
     99 	ep->e_name = savename(gentempname(ep));
    100 	ep->e_namlen = strlen(ep->e_name);
    101 	renameit(oldname, myname(ep));
    102 }
    103 
    104 /*
    105  * Generate a temporary name for an entry.
    106  */
    107 char *
    108 gentempname(ep)
    109 	struct entry *ep;
    110 {
    111 	static char name[MAXPATHLEN];
    112 	struct entry *np;
    113 	long i = 0;
    114 
    115 	for (np = lookupino(ep->e_ino);
    116 	    np != NULL && np != ep; np = np->e_links)
    117 		i++;
    118 	if (np == NULL)
    119 		badentry(ep, "not on ino list");
    120 	(void) snprintf(name, sizeof(name), "%s%ld%d", TMPHDR, (long) i,
    121 	    ep->e_ino);
    122 	return (name);
    123 }
    124 
    125 /*
    126  * Rename a file or directory.
    127  */
    128 void
    129 renameit(from, to)
    130 	char *from, *to;
    131 {
    132 	if (!Nflag && rename(from, to) < 0) {
    133 		fprintf(stderr, "warning: cannot rename %s to %s: %s\n",
    134 		    from, to, strerror(errno));
    135 		return;
    136 	}
    137 	vprintf(stdout, "rename %s to %s\n", from, to);
    138 }
    139 
    140 /*
    141  * Create a new node (directory).
    142  */
    143 void
    144 newnode(np)
    145 	struct entry *np;
    146 {
    147 	char *cp;
    148 
    149 	if (np->e_type != NODE)
    150 		badentry(np, "newnode: not a node");
    151 	cp = myname(np);
    152 	if (!Nflag && mkdir(cp, 0777) < 0) {
    153 		np->e_flags |= EXISTED;
    154 		fprintf(stderr, "warning: %s: %s\n", cp, strerror(errno));
    155 		return;
    156 	}
    157 	vprintf(stdout, "Make node %s\n", cp);
    158 }
    159 
    160 /*
    161  * Remove an old node (directory).
    162  */
    163 void
    164 removenode(ep)
    165 	struct entry *ep;
    166 {
    167 	char *cp;
    168 
    169 	if (ep->e_type != NODE)
    170 		badentry(ep, "removenode: not a node");
    171 	if (ep->e_entries != NULL)
    172 		badentry(ep, "removenode: non-empty directory");
    173 	ep->e_flags |= REMOVED;
    174 	ep->e_flags &= ~TMPNAME;
    175 	cp = myname(ep);
    176 	if (!Nflag && rmdir(cp) < 0) {
    177 		fprintf(stderr, "warning: %s: %s\n", cp, strerror(errno));
    178 		return;
    179 	}
    180 	vprintf(stdout, "Remove node %s\n", cp);
    181 }
    182 
    183 /*
    184  * Remove a leaf.
    185  */
    186 void
    187 removeleaf(ep)
    188 	struct entry *ep;
    189 {
    190 	char *cp;
    191 
    192 	if (ep->e_type != LEAF)
    193 		badentry(ep, "removeleaf: not a leaf");
    194 	ep->e_flags |= REMOVED;
    195 	ep->e_flags &= ~TMPNAME;
    196 	cp = myname(ep);
    197 	if (!Nflag && unlink(cp) < 0) {
    198 		fprintf(stderr, "warning: %s: %s\n", cp, strerror(errno));
    199 		return;
    200 	}
    201 	vprintf(stdout, "Remove leaf %s\n", cp);
    202 }
    203 
    204 /*
    205  * Create a link.
    206  */
    207 int
    208 linkit(existing, new, type)
    209 	char *existing, *new;
    210 	int type;
    211 {
    212 
    213 	if (type == SYMLINK) {
    214 		if (!Nflag && symlink(existing, new) < 0) {
    215 			fprintf(stderr,
    216 			    "warning: cannot create symbolic link %s->%s: %s\n",
    217 			    new, existing, strerror(errno));
    218 			return (FAIL);
    219 		}
    220 	} else if (type == HARDLINK) {
    221 		if (!Nflag && link(existing, new) < 0) {
    222 			fprintf(stderr,
    223 			    "warning: cannot create hard link %s->%s: %s\n",
    224 			    new, existing, strerror(errno));
    225 			return (FAIL);
    226 		}
    227 	} else {
    228 		panic("linkit: unknown type %d\n", type);
    229 		return (FAIL);
    230 	}
    231 	vprintf(stdout, "Create %s link %s->%s\n",
    232 		type == SYMLINK ? "symbolic" : "hard", new, existing);
    233 	return (GOOD);
    234 }
    235 
    236 /*
    237  * Create a whiteout.
    238  */
    239 int
    240 addwhiteout(name)
    241 	char *name;
    242 {
    243 
    244 	if (!Nflag && mknod(name, S_IFWHT, 0) < 0) {
    245 		fprintf(stderr, "warning: cannot create whiteout %s: %s\n",
    246 		    name, strerror(errno));
    247 		return (FAIL);
    248 	}
    249 	vprintf(stdout, "Create whiteout %s\n", name);
    250 	return (GOOD);
    251 }
    252 
    253 /*
    254  * Delete a whiteout.
    255  */
    256 void
    257 delwhiteout(ep)
    258 	struct entry *ep;
    259 {
    260 	char *name;
    261 
    262 	if (ep->e_type != LEAF)
    263 		badentry(ep, "delwhiteout: not a leaf");
    264 	ep->e_flags |= REMOVED;
    265 	ep->e_flags &= ~TMPNAME;
    266 	name = myname(ep);
    267 	if (!Nflag && undelete(name) < 0) {
    268 		fprintf(stderr, "warning: cannot delete whiteout %s: %s\n",
    269 		    name, strerror(errno));
    270 		return;
    271 	}
    272 	vprintf(stdout, "Delete whiteout %s\n", name);
    273 }
    274 
    275 /*
    276  * find lowest number file (above "start") that needs to be extracted
    277  */
    278 ino_t
    279 lowerbnd(start)
    280 	ino_t start;
    281 {
    282 	struct entry *ep;
    283 
    284 	for ( ; start < maxino; start++) {
    285 		ep = lookupino(start);
    286 		if (ep == NULL || ep->e_type == NODE)
    287 			continue;
    288 		if (ep->e_flags & (NEW|EXTRACT))
    289 			return (start);
    290 	}
    291 	return (start);
    292 }
    293 
    294 /*
    295  * find highest number file (below "start") that needs to be extracted
    296  */
    297 ino_t
    298 upperbnd(start)
    299 	ino_t start;
    300 {
    301 	struct entry *ep;
    302 
    303 	for ( ; start > ROOTINO; start--) {
    304 		ep = lookupino(start);
    305 		if (ep == NULL || ep->e_type == NODE)
    306 			continue;
    307 		if (ep->e_flags & (NEW|EXTRACT))
    308 			return (start);
    309 	}
    310 	return (start);
    311 }
    312 
    313 /*
    314  * report on a badly formed entry
    315  */
    316 void
    317 badentry(ep, message)
    318 	struct entry *ep;
    319 	char *message;
    320 {
    321 
    322 	fprintf(stderr, "bad entry: %s\n", message);
    323 	fprintf(stderr, "name: %s\n", myname(ep));
    324 	fprintf(stderr, "parent name %s\n", myname(ep->e_parent));
    325 	if (ep->e_sibling != NULL)
    326 		fprintf(stderr, "sibling name: %s\n", myname(ep->e_sibling));
    327 	if (ep->e_entries != NULL)
    328 		fprintf(stderr, "next entry name: %s\n", myname(ep->e_entries));
    329 	if (ep->e_links != NULL)
    330 		fprintf(stderr, "next link name: %s\n", myname(ep->e_links));
    331 	if (ep->e_next != NULL)
    332 		fprintf(stderr,
    333 		    "next hashchain name: %s\n", myname(ep->e_next));
    334 	fprintf(stderr, "entry type: %s\n",
    335 		ep->e_type == NODE ? "NODE" : "LEAF");
    336 	fprintf(stderr, "inode number: %ld\n", (long)ep->e_ino);
    337 	panic("flags: %s\n", flagvalues(ep));
    338 }
    339 
    340 /*
    341  * Construct a string indicating the active flag bits of an entry.
    342  */
    343 char *
    344 flagvalues(ep)
    345 	struct entry *ep;
    346 {
    347 	static char flagbuf[BUFSIZ];
    348 
    349 	(void) strcpy(flagbuf, "|NIL");
    350 	flagbuf[0] = '\0';
    351 	if (ep->e_flags & REMOVED)
    352 		(void) strcat(flagbuf, "|REMOVED");
    353 	if (ep->e_flags & TMPNAME)
    354 		(void) strcat(flagbuf, "|TMPNAME");
    355 	if (ep->e_flags & EXTRACT)
    356 		(void) strcat(flagbuf, "|EXTRACT");
    357 	if (ep->e_flags & NEW)
    358 		(void) strcat(flagbuf, "|NEW");
    359 	if (ep->e_flags & KEEP)
    360 		(void) strcat(flagbuf, "|KEEP");
    361 	if (ep->e_flags & EXISTED)
    362 		(void) strcat(flagbuf, "|EXISTED");
    363 	return (&flagbuf[1]);
    364 }
    365 
    366 /*
    367  * Check to see if a name is on a dump tape.
    368  */
    369 ino_t
    370 dirlookup(name)
    371 	const char *name;
    372 {
    373 	struct direct *dp;
    374 	ino_t ino;
    375 
    376 	ino = ((dp = pathsearch(name)) == NULL) ? 0 : dp->d_ino;
    377 
    378 	if (ino == 0 || TSTINO(ino, dumpmap) == 0)
    379 		fprintf(stderr, "%s is not on the tape\n", name);
    380 	return (ino);
    381 }
    382 
    383 /*
    384  * Elicit a reply.
    385  */
    386 int
    387 reply(question)
    388 	char *question;
    389 {
    390 	char c;
    391 
    392 	do	{
    393 		fprintf(stderr, "%s? [yn] ", question);
    394 		(void) fflush(stderr);
    395 		c = getc(terminal);
    396 		while (c != '\n' && getc(terminal) != '\n')
    397 			if (feof(terminal))
    398 				return (FAIL);
    399 	} while (c != 'y' && c != 'n');
    400 	if (c == 'y')
    401 		return (GOOD);
    402 	return (FAIL);
    403 }
    404 
    405 /*
    406  * handle unexpected inconsistencies
    407  */
    408 #include <stdarg.h>
    409 
    410 void
    411 panic(const char *fmt, ...)
    412 {
    413 	va_list ap;
    414 
    415 	va_start(ap, fmt);
    416 	vfprintf(stderr, fmt, ap);
    417 	va_end(ap);
    418 	if (yflag)
    419 		return;
    420 	if (reply("abort") == GOOD) {
    421 		if (reply("dump core") == GOOD)
    422 			abort();
    423 		exit(1);
    424 	}
    425 }
    426