restore/utilities.c

   1 /*
   2  *      Ported to Linux's Second Extended File System as part of the
   3  *      dump and restore backup suit
   4  *      Remy Card <card@Linux.EU.Org>, 1994-1997
   5  *      Stelian Pop <pop@cybercable.fr>, 1999
   6  *
   7  */
   8
   9 /*
  10  * Copyright (c) 1983, 1993
  11  *      The Regents of the University of California.  All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  */
  41
  42 #ifndef lint
  43 #if 0
  44 static char sccsid[] = "@(#)utilities.c 8.5 (Berkeley) 4/28/95";
  45 #endif
  46 static const char rcsid[] =
  47         "$Id: utilities.c,v 1.4 1999/10/11 13:08:10 stelian Exp $";
  48 #endif /* not lint */
  49
  50 #include <sys/param.h>
  51 #include <sys/stat.h>
  52
  53 #ifdef  __linux__
  54 #include <sys/time.h>
  55 #include <linux/ext2_fs.h>
  56 #include <bsdcompat.h>
  57 #else   /* __linux__ */
  58 #include <ufs/ufs/dinode.h>
  59 #include <ufs/ufs/dir.h>
  60 #endif  /* __linux__ */
  61
  62 #include <errno.h>
  63 #include <compaterr.h>
  64 #include <stdio.h>
  65 #include <string.h>
  66 #include <unistd.h>
  67
  68 #ifdef  __linux__
  69 #include <ext2fs/ext2fs.h>
  70 #endif
  71
  72 #include "restore.h"
  73 #include "extern.h"
  74
  75 /*
  76  * Insure that all the components of a pathname exist.
  77  */
  78 void
  79 pathcheck(char *name)
  80 {
  81         register char *cp;
  82         struct entry *ep;
  83         char *start;
  84
  85         start = strchr(name, '/');
  86         if (start == 0)
  87                 return;
  88         for (cp = start; *cp != '\0'; cp++) {
  89                 if (*cp != '/')
  90                         continue;
  91                 *cp = '\0';
  92                 ep = lookupname(name);
  93                 if (ep == NULL) {
  94                         /* Safe; we know the pathname exists in the dump. */
  95                         ep = addentry(name, pathsearch(name)->d_ino, NODE);
  96                         newnode(ep);
  97                 }
  98                 ep->e_flags |= NEW|KEEP;
  99                 *cp = '/';
 100         }
 101 }
 102
 103 /*
 104  * Change a name to a unique temporary name.
 105  */
 106 void
 107 mktempname(struct entry *ep)
 108 {
 109         char oldname[MAXPATHLEN];
 110
 111         if (ep->e_flags & TMPNAME)
 112                 badentry(ep, "mktempname: called with TMPNAME");
 113         ep->e_flags |= TMPNAME;
 114         (void) strcpy(oldname, myname(ep));
 115         freename(ep->e_name);
 116         ep->e_name = savename(gentempname(ep));
 117         ep->e_namlen = strlen(ep->e_name);
 118         renameit(oldname, myname(ep));
 119 }
 120
 121 /*
 122  * Generate a temporary name for an entry.
 123  */
 124 char *
 125 gentempname(struct entry *ep)
 126 {
 127         static char name[MAXPATHLEN];
 128         struct entry *np;
 129         long i = 0;
 130
 131         for (np = lookupino(ep->e_ino);
 132             np != NULL && np != ep; np = np->e_links)
 133                 i++;
 134         if (np == NULL)
 135                 badentry(ep, "not on ino list");
 136         (void) snprintf(name, sizeof(name), "%s%ld%lu", TMPHDR, i, (unsigned long)ep->e_ino);
 137         return (name);
 138 }
 139
 140 /*
 141  * Rename a file or directory.
 142  */
 143 void
 144 renameit(char *from, char *to)
 145 {
 146         if (!Nflag && rename(from, to) < 0) {
 147                 warn("cannot rename %s to %s", from, to);
 148                 return;
 149         }
 150         Vprintf(stdout, "rename %s to %s\n", from, to);
 151 }
 152
 153 /*
 154  * Create a new node (directory).
 155  */
 156 void
 157 newnode(struct entry *np)
 158 {
 159         char *cp;
 160         if (np->e_type != NODE)
 161                 badentry(np, "newnode: not a node");
 162         cp = myname(np);
 163         if (command == 'C') return;
 164
 165         if (!Nflag && mkdir(cp, 0777) < 0 && !uflag) {
 166                 np->e_flags |= EXISTED;
 167                 warn("%s", cp);
 168                 return;
 169         }
 170         Vprintf(stdout, "Make node %s\n", cp);
 171 }
 172
 173 /*
 174  * Remove an old node (directory).
 175  */
 176 void
 177 removenode(struct entry *ep)
 178 {
 179         char *cp;
 180
 181         if (ep->e_type != NODE)
 182                 badentry(ep, "removenode: not a node");
 183         if (ep->e_entries != NULL)
 184                 badentry(ep, "removenode: non-empty directory");
 185         ep->e_flags |= REMOVED;
 186         ep->e_flags &= ~TMPNAME;
 187         cp = myname(ep);
 188         if (!Nflag && rmdir(cp) < 0) {
 189                 warn("%s", cp);
 190                 return;
 191         }
 192         Vprintf(stdout, "Remove node %s\n", cp);
 193 }
 194
 195 /*
 196  * Remove a leaf.
 197  */
 198 void
 199 removeleaf(struct entry *ep)
 200 {
 201         char *cp;
 202
 203         if (command == 'C') return;
 204
 205         if (ep->e_type != LEAF)
 206                 badentry(ep, "removeleaf: not a leaf");
 207         ep->e_flags |= REMOVED;
 208         ep->e_flags &= ~TMPNAME;
 209         cp = myname(ep);
 210         if (!Nflag && unlink(cp) < 0) {
 211                 warn("%s", cp);
 212                 return;
 213         }
 214         Vprintf(stdout, "Remove leaf %s\n", cp);
 215 }
 216
 217 /*
 218  * Create a link.
 219  */
 220 int
 221 linkit(char *existing, char *new, int type)
 222 {
 223
 224         /* if we want to unlink first, do it now so *link() won't fail */
 225         if (uflag && !Nflag)
 226                 (void)unlink(new);
 227
 228         if (type == SYMLINK) {
 229                 if (!Nflag && symlink(existing, new) < 0) {
 230                         warn("cannot create symbolic link %s->%s",
 231                             new, existing);
 232                         return (FAIL);
 233                 }
 234         } else if (type == HARDLINK) {
 235                 int ret;
 236
 237                 if (!Nflag && (ret = link(existing, new)) < 0) {
 238
 239 #ifndef __linux__
 240                         struct stat s;
 241
 242                         /*
 243                          * Most likely, the schg flag is set.  Clear the
 244                          * flags and try again.
 245                          */
 246                         if (stat(existing, &s) == 0 && s.st_flags != 0 &&
 247                             chflags(existing, 0) == 0) {
 248                                 ret = link(existing, new);
 249                                 chflags(existing, s.st_flags);
 250                         }
 251 #endif
 252                         if (ret < 0) {
 253                                 warn("warning: cannot create hard link %s->%s",
 254                                     new, existing);
 255                                 return (FAIL);
 256                         }
 257                 }
 258         } else {
 259                 panic("linkit: unknown type %d\n", type);
 260                 return (FAIL);
 261         }
 262         Vprintf(stdout, "Create %s link %s->%s\n",
 263                 type == SYMLINK ? "symbolic" : "hard", new, existing);
 264         return (GOOD);
 265 }
 266
 267 #ifndef __linux__
 268 /*
 269  * Create a whiteout.
 270  */
 271 int
 272 addwhiteout(char *name)
 273 {
 274
 275         if (!Nflag && mknod(name, S_IFWHT, 0) < 0) {
 276                 warn("cannot create whiteout %s", name);
 277                 return (FAIL);
 278         }
 279         Vprintf(stdout, "Create whiteout %s\n", name);
 280         return (GOOD);
 281 }
 282
 283 /*
 284  * Delete a whiteout.
 285  */
 286 void
 287 delwhiteout(struct entry *ep)
 288 {
 289         char *name;
 290
 291         if (ep->e_type != LEAF)
 292                 badentry(ep, "delwhiteout: not a leaf");
 293         ep->e_flags |= REMOVED;
 294         ep->e_flags &= ~TMPNAME;
 295         name = myname(ep);
 296         if (!Nflag && undelete(name) < 0) {
 297                 warn("cannot delete whiteout %s", name);
 298                 return;
 299         }
 300         Vprintf(stdout, "Delete whiteout %s\n", name);
 301 }
 302 #endif
 303
 304 /*
 305  * find lowest number file (above "start") that needs to be extracted
 306  */
 307 ino_t
 308 lowerbnd(ino_t start)
 309 {
 310         register struct entry *ep;
 311
 312         for ( ; start < maxino; start++) {
 313                 ep = lookupino(start);
 314                 if (ep == NULL || ep->e_type == NODE)
 315                         continue;
 316                 if (ep->e_flags & (NEW|EXTRACT))
 317                         return (start);
 318         }
 319         return (start);
 320 }
 321
 322 /*
 323  * find highest number file (below "start") that needs to be extracted
 324  */
 325 ino_t
 326 upperbnd(ino_t start)
 327 {
 328         register struct entry *ep;
 329
 330         for ( ; start > ROOTINO; start--) {
 331                 ep = lookupino(start);
 332                 if (ep == NULL || ep->e_type == NODE)
 333                         continue;
 334                 if (ep->e_flags & (NEW|EXTRACT))
 335                         return (start);
 336         }
 337         return (start);
 338 }
 339
 340 /*
 341  * report on a badly formed entry
 342  */
 343 void
 344 badentry(struct entry *ep, const char *msg)
 345 {
 346
 347         fprintf(stderr, "bad entry: %s\n", msg);
 348         fprintf(stderr, "name: %s\n", myname(ep));
 349         fprintf(stderr, "parent name %s\n", myname(ep->e_parent));
 350         if (ep->e_sibling != NULL)
 351                 fprintf(stderr, "sibling name: %s\n", myname(ep->e_sibling));
 352         if (ep->e_entries != NULL)
 353                 fprintf(stderr, "next entry name: %s\n", myname(ep->e_entries));
 354         if (ep->e_links != NULL)
 355                 fprintf(stderr, "next link name: %s\n", myname(ep->e_links));
 356         if (ep->e_next != NULL)
 357                 fprintf(stderr,
 358                     "next hashchain name: %s\n", myname(ep->e_next));
 359         fprintf(stderr, "entry type: %s\n",
 360                 ep->e_type == NODE ? "NODE" : "LEAF");
 361         fprintf(stderr, "inode number: %lu\n", (unsigned long)ep->e_ino);
 362         panic("flags: %s\n", flagvalues(ep));
 363 }
 364
 365 /*
 366  * Construct a string indicating the active flag bits of an entry.
 367  */
 368 char *
 369 flagvalues(struct entry *ep)
 370 {
 371         static char flagbuf[BUFSIZ];
 372
 373         (void) strcpy(flagbuf, "|NIL");
 374         flagbuf[0] = '\0';
 375         if (ep->e_flags & REMOVED)
 376                 (void) strcat(flagbuf, "|REMOVED");
 377         if (ep->e_flags & TMPNAME)
 378                 (void) strcat(flagbuf, "|TMPNAME");
 379         if (ep->e_flags & EXTRACT)
 380                 (void) strcat(flagbuf, "|EXTRACT");
 381         if (ep->e_flags & NEW)
 382                 (void) strcat(flagbuf, "|NEW");
 383         if (ep->e_flags & KEEP)
 384                 (void) strcat(flagbuf, "|KEEP");
 385         if (ep->e_flags & EXISTED)
 386                 (void) strcat(flagbuf, "|EXISTED");
 387         return (&flagbuf[1]);
 388 }
 389
 390 /*
 391  * Check to see if a name is on a dump tape.
 392  */
 393 ino_t
 394 dirlookup(const char *name)
 395 {
 396         struct direct *dp;
 397         ino_t ino;
 398
 399         ino = ((dp = pathsearch(name)) == NULL) ? 0 : dp->d_ino;
 400
 401         if (ino == 0 || TSTINO(ino, dumpmap) == 0)
 402                 fprintf(stderr, "%s is not on the tape\n", name);
 403         return (ino);
 404 }
 405
 406 /*
 407  * Elicit a reply.
 408  */
 409 int
 410 reply(const char *question)
 411 {
 412         char c;
 413
 414         do      {
 415                 fprintf(stderr, "%s? [yn] ", question);
 416                 (void) fflush(stderr);
 417                 c = getc(terminal);
 418                 while (c != '\n' && getc(terminal) != '\n')
 419                         if (feof(terminal))
 420                                 return (FAIL);
 421         } while (c != 'y' && c != 'n');
 422         if (c == 'y')
 423                 return (GOOD);
 424         return (FAIL);
 425 }
 426
 427 /*
 428  * handle unexpected inconsistencies
 429  */
 430 #ifdef __STDC__
 431 #include <stdarg.h>
 432 #else
 433 #include <varargs.h>
 434 #endif
 435
 436 void
 437 #ifdef __STDC__
 438 panic(const char *fmt, ...)
 439 #else
 440 panic(fmt, va_alist)
 441         char *fmt;
 442         va_dcl
 443 #endif
 444 {
 445         va_list ap;
 446 #ifdef __STDC__
 447         va_start(ap, fmt);
 448 #else
 449         va_start(ap);
 450 #endif
 451
 452         vfprintf(stderr, fmt, ap);
 453         if (yflag)
 454                 return;
 455         if (reply("abort") == GOOD) {
 456                 if (reply("dump core") == GOOD)
 457                         abort();
 458                 exit(1);
 459         }
 460 }