contrib/mtree/spec.c

   1 /*      $NetBSD: spec.c,v 1.89 2014/04/24 17:22:41 christos Exp $       */
   2
   3 /*-
   4  * Copyright (c) 1989, 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 /*-
  33  * Copyright (c) 2001-2004 The NetBSD Foundation, Inc.
  34  * All rights reserved.
  35  *
  36  * This code is derived from software contributed to The NetBSD Foundation
  37  * by Luke Mewburn of Wasabi Systems.
  38  *
  39  * Redistribution and use in source and binary forms, with or without
  40  * modification, are permitted provided that the following conditions
  41  * are met:
  42  * 1. Redistributions of source code must retain the above copyright
  43  *    notice, this list of conditions and the following disclaimer.
  44  * 2. Redistributions in binary form must reproduce the above copyright
  45  *    notice, this list of conditions and the following disclaimer in the
  46  *    documentation and/or other materials provided with the distribution.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  49  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  50  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  51  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  52  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  53  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  54  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  55  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  56  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  57  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  58  * POSSIBILITY OF SUCH DAMAGE.
  59  */
  60
  61 #if HAVE_NBTOOL_CONFIG_H
  62 #include "nbtool_config.h"
  63 #endif
  64
  65 #include <sys/cdefs.h>
  66 #if defined(__RCSID) && !defined(lint)
  67 #if 0
  68 static char sccsid[] = "@(#)spec.c      8.2 (Berkeley) 4/28/95";
  69 #else
  70 __RCSID("$NetBSD: spec.c,v 1.89 2014/04/24 17:22:41 christos Exp $");
  71 #endif
  72 #endif /* not lint */
  73
  74 #include <sys/param.h>
  75 #include <sys/stat.h>
  76
  77 #include <assert.h>
  78 #include <ctype.h>
  79 #include <errno.h>
  80 #include <grp.h>
  81 #include <pwd.h>
  82 #include <stdarg.h>
  83 #include <stdio.h>
  84 #include <stdint.h>
  85 #include <stdlib.h>
  86 #include <string.h>
  87 #include <unistd.h>
  88 #include <vis.h>
  89 #include <util.h>
  90
  91 #include "extern.h"
  92 #include "pack_dev.h"
  93
  94 size_t  mtree_lineno;                   /* Current spec line number */
  95 int     mtree_Mflag;                    /* Merge duplicate entries */
  96 int     mtree_Wflag;                    /* Don't "whack" permissions */
  97 int     mtree_Sflag;                    /* Sort entries */
  98
  99 static  dev_t   parsedev(char *);
 100 static  void    replacenode(NODE *, NODE *);
 101 static  void    set(char *, NODE *);
 102 static  void    unset(char *, NODE *);
 103 static  void    addchild(NODE *, NODE *);
 104 static  int     nodecmp(const NODE *, const NODE *);
 105 static  int     appendfield(FILE *, int, const char *, ...) __printflike(3, 4);
 106
 107 #define REPLACEPTR(x,v) do { if ((x)) free((x)); (x) = (v); } while (0)
 108
 109 NODE *
 110 spec(FILE *fp)
 111 {
 112         NODE *centry, *last, *pathparent, *cur;
 113         char *p, *e, *next;
 114         NODE ginfo, *root;
 115         char *buf, *tname, *ntname;
 116         size_t tnamelen, plen;
 117
 118         root = NULL;
 119         centry = last = NULL;
 120         tname = NULL;
 121         tnamelen = 0;
 122         memset(&ginfo, 0, sizeof(ginfo));
 123         for (mtree_lineno = 0;
 124             (buf = fparseln(fp, NULL, &mtree_lineno, NULL,
 125                 FPARSELN_UNESCCOMM));
 126             free(buf)) {
 127                 /* Skip leading whitespace. */
 128                 for (p = buf; *p && isspace((unsigned char)*p); ++p)
 129                         continue;
 130
 131                 /* If nothing but whitespace, continue. */
 132                 if (!*p)
 133                         continue;
 134
 135 #ifdef DEBUG
 136                 fprintf(stderr, "line %lu: {%s}\n",
 137                     (u_long)mtree_lineno, p);
 138 #endif
 139                 /* Grab file name, "$", "set", or "unset". */
 140                 next = buf;
 141                 while ((p = strsep(&next, " \t")) != NULL && *p == '\0')
 142                         continue;
 143                 if (p == NULL)
 144                         mtree_err("missing field");
 145
 146                 if (p[0] == '/') {
 147                         if (strcmp(p + 1, "set") == 0)
 148                                 set(next, &ginfo);
 149                         else if (strcmp(p + 1, "unset") == 0)
 150                                 unset(next, &ginfo);
 151                         else
 152                                 mtree_err("invalid specification `%s'", p);
 153                         continue;
 154                 }
 155
 156                 if (strcmp(p, "..") == 0) {
 157                         /* Don't go up, if haven't gone down. */
 158                         if (root == NULL)
 159                                 goto noparent;
 160                         if (last->type != F_DIR || last->flags & F_DONE) {
 161                                 if (last == root)
 162                                         goto noparent;
 163                                 last = last->parent;
 164                         }
 165                         last->flags |= F_DONE;
 166                         continue;
 167
 168 noparent:               mtree_err("no parent node");
 169                 }
 170
 171                 plen = strlen(p) + 1;
 172                 if (plen > tnamelen) {
 173                         if ((ntname = realloc(tname, plen)) == NULL)
 174                                 mtree_err("realloc: %s", strerror(errno));
 175                         tname = ntname;
 176                         tnamelen = plen;
 177                 }
 178                 if (strunvis(tname, p) == -1)
 179                         mtree_err("strunvis failed on `%s'", p);
 180                 p = tname;
 181
 182                 pathparent = NULL;
 183                 if (strchr(p, '/') != NULL) {
 184                         cur = root;
 185                         for (; (e = strchr(p, '/')) != NULL; p = e+1) {
 186                                 if (p == e)
 187                                         continue;       /* handle // */
 188                                 *e = '\0';
 189                                 if (strcmp(p, ".") != 0) {
 190                                         while (cur &&
 191                                             strcmp(cur->name, p) != 0) {
 192                                                 cur = cur->next;
 193                                         }
 194                                 }
 195                                 if (cur == NULL || cur->type != F_DIR) {
 196                                         mtree_err("%s: %s", tname,
 197                                         "missing directory in specification");
 198                                 }
 199                                 *e = '/';
 200                                 pathparent = cur;
 201                                 cur = cur->child;
 202                         }
 203                         if (*p == '\0')
 204                                 mtree_err("%s: empty leaf element", tname);
 205                 }
 206
 207                 if ((centry = calloc(1, sizeof(NODE) + strlen(p))) == NULL)
 208                         mtree_err("%s", strerror(errno));
 209                 *centry = ginfo;
 210                 centry->lineno = mtree_lineno;
 211                 strcpy(centry->name, p);
 212 #define MAGIC   "?*["
 213                 if (strpbrk(p, MAGIC))
 214                         centry->flags |= F_MAGIC;
 215                 set(next, centry);
 216
 217                 if (root == NULL) {
 218                                 /*
 219                                  * empty tree
 220                                  */
 221                         /*
 222                          * Allow a bare "." root node by forcing it to
 223                          * type=dir for compatibility with FreeBSD.
 224                          */
 225                         if (strcmp(centry->name, ".") == 0 && centry->type == 0)
 226                                 centry->type = F_DIR;
 227                         if (strcmp(centry->name, ".") != 0 ||
 228                             centry->type != F_DIR)
 229                                 mtree_err(
 230                                     "root node must be the directory `.'");
 231                         last = root = centry;
 232                         root->parent = root;
 233                 } else if (pathparent != NULL) {
 234                                 /*
 235                                  * full path entry; add or replace
 236                                  */
 237                         centry->parent = pathparent;
 238                         addchild(pathparent, centry);
 239                         last = centry;
 240                 } else if (strcmp(centry->name, ".") == 0) {
 241                                 /*
 242                                  * duplicate "." entry; always replace
 243                                  */
 244                         replacenode(root, centry);
 245                 } else if (last->type == F_DIR && !(last->flags & F_DONE)) {
 246                                 /*
 247                                  * new relative child in current dir;
 248                                  * add or replace
 249                                  */
 250                         centry->parent = last;
 251                         addchild(last, centry);
 252                         last = centry;
 253                 } else {
 254                                 /*
 255                                  * new relative child in parent dir
 256                                  * (after encountering ".." entry);
 257                                  * add or replace
 258                                  */
 259                         centry->parent = last->parent;
 260                         addchild(last->parent, centry);
 261                         last = centry;
 262                 }
 263         }
 264         return (root);
 265 }
 266
 267 void
 268 free_nodes(NODE *root)
 269 {
 270         NODE    *cur, *next;
 271
 272         if (root == NULL)
 273                 return;
 274
 275         next = NULL;
 276         for (cur = root; cur != NULL; cur = next) {
 277                 next = cur->next;
 278                 free_nodes(cur->child);
 279                 REPLACEPTR(cur->slink, NULL);
 280                 REPLACEPTR(cur->md5digest, NULL);
 281                 REPLACEPTR(cur->rmd160digest, NULL);
 282                 REPLACEPTR(cur->sha1digest, NULL);
 283                 REPLACEPTR(cur->sha256digest, NULL);
 284                 REPLACEPTR(cur->sha384digest, NULL);
 285                 REPLACEPTR(cur->sha512digest, NULL);
 286                 REPLACEPTR(cur->tags, NULL);
 287                 REPLACEPTR(cur, NULL);
 288         }
 289 }
 290
 291 /*
 292  * appendfield --
 293  *      Like fprintf(), but output a space either before or after
 294  *      the regular output, according to the pathlast flag.
 295  */
 296 static int
 297 appendfield(FILE *fp, int pathlast, const char *fmt, ...)
 298 {
 299         va_list ap;
 300         int result;
 301
 302         va_start(ap, fmt);
 303         if (!pathlast)
 304                 fprintf(fp, " ");
 305         result = vprintf(fmt, ap);
 306         if (pathlast)
 307                 fprintf(fp, " ");
 308         va_end(ap);
 309         return result;
 310 }
 311
 312 /*
 313  * dump_nodes --
 314  *      dump the NODEs from `cur', based in the directory `dir'.
 315  *      if pathlast is none zero, print the path last, otherwise print
 316  *      it first.
 317  */
 318 void
 319 dump_nodes(FILE *fp, const char *dir, NODE *root, int pathlast)
 320 {
 321         NODE    *cur;
 322         char    path[MAXPATHLEN];
 323         const char *name;
 324         char    *str;
 325         char    *p, *q;
 326
 327         for (cur = root; cur != NULL; cur = cur->next) {
 328                 if (cur->type != F_DIR && !matchtags(cur))
 329                         continue;
 330
 331                 if (snprintf(path, sizeof(path), "%s%s%s",
 332                     dir, *dir ? "/" : "", cur->name)
 333                     >= (int)sizeof(path))
 334                         mtree_err("Pathname too long.");
 335
 336                 if (!pathlast)
 337                         fprintf(fp, "%s", vispath(path));
 338
 339 #define MATCHFLAG(f)    ((keys & (f)) && (cur->flags & (f)))
 340                 if (MATCHFLAG(F_TYPE))
 341                         appendfield(fp, pathlast, "type=%s",
 342                             nodetype(cur->type));
 343                 if (MATCHFLAG(F_UID | F_UNAME)) {
 344                         if (keys & F_UNAME &&
 345                             (name = user_from_uid(cur->st_uid, 1)) != NULL)
 346                                 appendfield(fp, pathlast, "uname=%s", name);
 347                         else
 348                                 appendfield(fp, pathlast, "uid=%u",
 349                                     cur->st_uid);
 350                 }
 351                 if (MATCHFLAG(F_GID | F_GNAME)) {
 352                         if (keys & F_GNAME &&
 353                             (name = group_from_gid(cur->st_gid, 1)) != NULL)
 354                                 appendfield(fp, pathlast, "gname=%s", name);
 355                         else
 356                                 appendfield(fp, pathlast, "gid=%u",
 357                                     cur->st_gid);
 358                 }
 359                 if (MATCHFLAG(F_MODE))
 360                         appendfield(fp, pathlast, "mode=%#o", cur->st_mode);
 361                 if (MATCHFLAG(F_DEV) &&
 362                     (cur->type == F_BLOCK || cur->type == F_CHAR))
 363                         appendfield(fp, pathlast, "device=%#jx",
 364                             (uintmax_t)cur->st_rdev);
 365                 if (MATCHFLAG(F_NLINK))
 366                         appendfield(fp, pathlast, "nlink=%d", cur->st_nlink);
 367                 if (MATCHFLAG(F_SLINK))
 368                         appendfield(fp, pathlast, "link=%s",
 369                             vispath(cur->slink));
 370                 if (MATCHFLAG(F_SIZE))
 371                         appendfield(fp, pathlast, "size=%ju",
 372                             (uintmax_t)cur->st_size);
 373                 if (MATCHFLAG(F_TIME))
 374                         appendfield(fp, pathlast, "time=%jd.%09ld",
 375                             (intmax_t)cur->st_mtimespec.tv_sec,
 376                             cur->st_mtimespec.tv_nsec);
 377                 if (MATCHFLAG(F_CKSUM))
 378                         appendfield(fp, pathlast, "cksum=%lu", cur->cksum);
 379                 if (MATCHFLAG(F_MD5))
 380                         appendfield(fp, pathlast, "%s=%s", MD5KEY,
 381                             cur->md5digest);
 382                 if (MATCHFLAG(F_RMD160))
 383                         appendfield(fp, pathlast, "%s=%s", RMD160KEY,
 384                             cur->rmd160digest);
 385                 if (MATCHFLAG(F_SHA1))
 386                         appendfield(fp, pathlast, "%s=%s", SHA1KEY,
 387                             cur->sha1digest);
 388                 if (MATCHFLAG(F_SHA256))
 389                         appendfield(fp, pathlast, "%s=%s", SHA256KEY,
 390                             cur->sha256digest);
 391                 if (MATCHFLAG(F_SHA384))
 392                         appendfield(fp, pathlast, "%s=%s", SHA384KEY,
 393                             cur->sha384digest);
 394                 if (MATCHFLAG(F_SHA512))
 395                         appendfield(fp, pathlast, "%s=%s", SHA512KEY,
 396                             cur->sha512digest);
 397                 if (MATCHFLAG(F_FLAGS)) {
 398                         str = flags_to_string(cur->st_flags, "none");
 399                         appendfield(fp, pathlast, "flags=%s", str);
 400                         free(str);
 401                 }
 402                 if (MATCHFLAG(F_IGN))
 403                         appendfield(fp, pathlast, "ignore");
 404                 if (MATCHFLAG(F_OPT))
 405                         appendfield(fp, pathlast, "optional");
 406                 if (MATCHFLAG(F_TAGS)) {
 407                         /* don't output leading or trailing commas */
 408                         p = cur->tags;
 409                         while (*p == ',')
 410                                 p++;
 411                         q = p + strlen(p);
 412                         while(q > p && q[-1] == ',')
 413                                 q--;
 414                         appendfield(fp, pathlast, "tags=%.*s", (int)(q - p), p);
 415                 }
 416                 puts(pathlast ? vispath(path) : "");
 417
 418                 if (cur->child)
 419                         dump_nodes(fp, path, cur->child, pathlast);
 420         }
 421 }
 422
 423 /*
 424  * vispath --
 425  *      strsvis(3) encodes path, which must not be longer than MAXPATHLEN
 426  *      characters long, and returns a pointer to a static buffer containing
 427  *      the result.
 428  */
 429 char *
 430 vispath(const char *path)
 431 {
 432         static const char extra[] = { ' ', '\t', '\n', '\\', '#', '\0' };
 433         static const char extra_glob[] = { ' ', '\t', '\n', '\\', '#', '*',
 434             '?', '[', '\0' };
 435         static char pathbuf[4*MAXPATHLEN + 1];
 436
 437         if (flavor == F_NETBSD6)
 438                 strsvis(pathbuf, path, VIS_CSTYLE, extra);
 439         else
 440                 strsvis(pathbuf, path, VIS_OCTAL, extra_glob);
 441         return pathbuf;
 442 }
 443
 444
 445 static dev_t
 446 parsedev(char *arg)
 447 {
 448 #define MAX_PACK_ARGS   3
 449         u_long  numbers[MAX_PACK_ARGS];
 450         char    *p, *ep, *dev;
 451         int     argc;
 452         pack_t  *pack;
 453         dev_t   result;
 454         const char *error = NULL;
 455
 456         if ((dev = strchr(arg, ',')) != NULL) {
 457                 *dev++='\0';
 458                 if ((pack = pack_find(arg)) == NULL)
 459                         mtree_err("unknown format `%s'", arg);
 460                 argc = 0;
 461                 while ((p = strsep(&dev, ",")) != NULL) {
 462                         if (*p == '\0')
 463                                 mtree_err("missing number");
 464                         numbers[argc++] = strtoul(p, &ep, 0);
 465                         if (*ep != '\0')
 466                                 mtree_err("invalid number `%s'",
 467                                     p);
 468                         if (argc > MAX_PACK_ARGS)
 469                                 mtree_err("too many arguments");
 470                 }
 471                 if (argc < 2)
 472                         mtree_err("not enough arguments");
 473                 result = (*pack)(argc, numbers, &error);
 474                 if (error != NULL)
 475                         mtree_err("%s", error);
 476         } else {
 477                 result = (dev_t)strtoul(arg, &ep, 0);
 478                 if (*ep != '\0')
 479                         mtree_err("invalid device `%s'", arg);
 480         }
 481         return (result);
 482 }
 483
 484 static void
 485 replacenode(NODE *cur, NODE *new)
 486 {
 487
 488 #define REPLACE(x)      cur->x = new->x
 489 #define REPLACESTR(x)   REPLACEPTR(cur->x,new->x)
 490
 491         if (cur->type != new->type) {
 492                 if (mtree_Mflag) {
 493                                 /*
 494                                  * merge entries with different types; we
 495                                  * don't want children retained in this case.
 496                                  */
 497                         REPLACE(type);
 498                         free_nodes(cur->child);
 499                         cur->child = NULL;
 500                 } else {
 501                         mtree_err(
 502                             "existing entry for `%s', type `%s'"
 503                             " does not match type `%s'",
 504                             cur->name, nodetype(cur->type),
 505                             nodetype(new->type));
 506                 }
 507         }
 508
 509         REPLACE(st_size);
 510         REPLACE(st_mtimespec);
 511         REPLACESTR(slink);
 512         if (cur->slink != NULL) {
 513                 if ((cur->slink = strdup(new->slink)) == NULL)
 514                         mtree_err("memory allocation error");
 515                 if (strunvis(cur->slink, new->slink) == -1)
 516                         mtree_err("strunvis failed on `%s'", new->slink);
 517                 free(new->slink);
 518         }
 519         REPLACE(st_uid);
 520         REPLACE(st_gid);
 521         REPLACE(st_mode);
 522         REPLACE(st_rdev);
 523         REPLACE(st_flags);
 524         REPLACE(st_nlink);
 525         REPLACE(cksum);
 526         REPLACESTR(md5digest);
 527         REPLACESTR(rmd160digest);
 528         REPLACESTR(sha1digest);
 529         REPLACESTR(sha256digest);
 530         REPLACESTR(sha384digest);
 531         REPLACESTR(sha512digest);
 532         REPLACESTR(tags);
 533         REPLACE(lineno);
 534         REPLACE(flags);
 535         free(new);
 536 }
 537
 538 static void
 539 set(char *t, NODE *ip)
 540 {
 541         int     type, value, len;
 542         gid_t   gid;
 543         uid_t   uid;
 544         char    *kw, *val, *md, *ep;
 545         void    *m;
 546
 547         while ((kw = strsep(&t, "= \t")) != NULL) {
 548                 if (*kw == '\0')
 549                         continue;
 550                 if (strcmp(kw, "all") == 0)
 551                         mtree_err("invalid keyword `all'");
 552                 ip->flags |= type = parsekey(kw, &value);
 553                 if (!value)
 554                         /* Just set flag bit (F_IGN and F_OPT) */
 555                         continue;
 556                 while ((val = strsep(&t, " \t")) != NULL && *val == '\0')
 557                         continue;
 558                 if (val == NULL)
 559                         mtree_err("missing value");
 560                 switch (type) {
 561                 case F_CKSUM:
 562                         ip->cksum = strtoul(val, &ep, 10);
 563                         if (*ep)
 564                                 mtree_err("invalid checksum `%s'", val);
 565                         break;
 566                 case F_DEV:
 567                         ip->st_rdev = parsedev(val);
 568                         break;
 569                 case F_FLAGS:
 570                         if (strcmp("none", val) == 0)
 571                                 ip->st_flags = 0;
 572                         else if (string_to_flags(&val, &ip->st_flags, NULL)
 573                             != 0)
 574                                 mtree_err("invalid flag `%s'", val);
 575                         break;
 576                 case F_GID:
 577                         ip->st_gid = (gid_t)strtoul(val, &ep, 10);
 578                         if (*ep)
 579                                 mtree_err("invalid gid `%s'", val);
 580                         break;
 581                 case F_GNAME:
 582                         if (mtree_Wflag)        /* don't parse if whacking */
 583                                 break;
 584                         if (gid_from_group(val, &gid) == -1)
 585                                 mtree_err("unknown group `%s'", val);
 586                         ip->st_gid = gid;
 587                         break;
 588                 case F_MD5:
 589                         if (val[0]=='0' && val[1]=='x')
 590                                 md=&val[2];
 591                         else
 592                                 md=val;
 593                         if ((ip->md5digest = strdup(md)) == NULL)
 594                                 mtree_err("memory allocation error");
 595                         break;
 596                 case F_MODE:
 597                         if ((m = setmode(val)) == NULL)
 598                                 mtree_err("cannot set file mode `%s' (%s)",
 599                                     val, strerror(errno));
 600                         ip->st_mode = getmode(m, 0);
 601                         free(m);
 602                         break;
 603                 case F_NLINK:
 604                         ip->st_nlink = (nlink_t)strtoul(val, &ep, 10);
 605                         if (*ep)
 606                                 mtree_err("invalid link count `%s'", val);
 607                         break;
 608                 case F_RMD160:
 609                         if (val[0]=='0' && val[1]=='x')
 610                                 md=&val[2];
 611                         else
 612                                 md=val;
 613                         if ((ip->rmd160digest = strdup(md)) == NULL)
 614                                 mtree_err("memory allocation error");
 615                         break;
 616                 case F_SHA1:
 617                         if (val[0]=='0' && val[1]=='x')
 618                                 md=&val[2];
 619                         else
 620                                 md=val;
 621                         if ((ip->sha1digest = strdup(md)) == NULL)
 622                                 mtree_err("memory allocation error");
 623                         break;
 624                 case F_SIZE:
 625                         ip->st_size = (off_t)strtoll(val, &ep, 10);
 626                         if (*ep)
 627                                 mtree_err("invalid size `%s'", val);
 628                         break;
 629                 case F_SLINK:
 630                         if ((ip->slink = strdup(val)) == NULL)
 631                                 mtree_err("memory allocation error");
 632                         if (strunvis(ip->slink, val) == -1)
 633                                 mtree_err("strunvis failed on `%s'", val);
 634                         break;
 635                 case F_TAGS:
 636                         len = strlen(val) + 3;  /* "," + str + ",\0" */
 637                         if ((ip->tags = malloc(len)) == NULL)
 638                                 mtree_err("memory allocation error");
 639                         snprintf(ip->tags, len, ",%s,", val);
 640                         break;
 641                 case F_TIME:
 642                         ip->st_mtimespec.tv_sec =
 643                             (time_t)strtoll(val, &ep, 10);
 644                         if (*ep != '.')
 645                                 mtree_err("invalid time `%s'", val);
 646                         val = ep + 1;
 647                         ip->st_mtimespec.tv_nsec = strtol(val, &ep, 10);
 648                         if (*ep)
 649                                 mtree_err("invalid time `%s'", val);
 650                         break;
 651                 case F_TYPE:
 652                         ip->type = parsetype(val);
 653                         break;
 654                 case F_UID:
 655                         ip->st_uid = (uid_t)strtoul(val, &ep, 10);
 656                         if (*ep)
 657                                 mtree_err("invalid uid `%s'", val);
 658                         break;
 659                 case F_UNAME:
 660                         if (mtree_Wflag)        /* don't parse if whacking */
 661                                 break;
 662                         if (uid_from_user(val, &uid) == -1)
 663                                 mtree_err("unknown user `%s'", val);
 664                         ip->st_uid = uid;
 665                         break;
 666                 case F_SHA256:
 667                         if (val[0]=='0' && val[1]=='x')
 668                                 md=&val[2];
 669                         else
 670                                 md=val;
 671                         if ((ip->sha256digest = strdup(md)) == NULL)
 672                                 mtree_err("memory allocation error");
 673                         break;
 674                 case F_SHA384:
 675                         if (val[0]=='0' && val[1]=='x')
 676                                 md=&val[2];
 677                         else
 678                                 md=val;
 679                         if ((ip->sha384digest = strdup(md)) == NULL)
 680                                 mtree_err("memory allocation error");
 681                         break;
 682                 case F_SHA512:
 683                         if (val[0]=='0' && val[1]=='x')
 684                                 md=&val[2];
 685                         else
 686                                 md=val;
 687                         if ((ip->sha512digest = strdup(md)) == NULL)
 688                                 mtree_err("memory allocation error");
 689                         break;
 690                 default:
 691                         mtree_err(
 692                             "set(): unsupported key type 0x%x (INTERNAL ERROR)",
 693                             type);
 694                         /* NOTREACHED */
 695                 }
 696         }
 697 }
 698
 699 static void
 700 unset(char *t, NODE *ip)
 701 {
 702         char *p;
 703
 704         while ((p = strsep(&t, " \t")) != NULL) {
 705                 if (*p == '\0')
 706                         continue;
 707                 ip->flags &= ~parsekey(p, NULL);
 708         }
 709 }
 710
 711 /*
 712  * addchild --
 713  *      Add the centry node as a child of the pathparent node.  If
 714  *      centry is a duplicate, call replacenode().  If centry is not
 715  *      a duplicate, insert it into the linked list referenced by
 716  *      pathparent->child.  Keep the list sorted if Sflag is set.
 717  */
 718 static void
 719 addchild(NODE *pathparent, NODE *centry)
 720 {
 721         NODE *samename;      /* node with the same name as centry */
 722         NODE *replacepos;    /* if non-NULL, centry should replace this node */
 723         NODE *insertpos;     /* if non-NULL, centry should be inserted
 724                               * after this node */
 725         NODE *cur;           /* for stepping through the list */
 726         NODE *last;          /* the last node in the list */
 727         int cmp;
 728
 729         samename = NULL;
 730         replacepos = NULL;
 731         insertpos = NULL;
 732         last = NULL;
 733         cur = pathparent->child;
 734         if (cur == NULL) {
 735                 /* centry is pathparent's first and only child node so far */
 736                 pathparent->child = centry;
 737                 return;
 738         }
 739
 740         /*
 741          * pathparent already has at least one other child, so add the
 742          * centry node to the list.
 743          *
 744          * We first scan through the list looking for an existing node
 745          * with the same name (setting samename), and also looking
 746          * for the correct position to replace or insert the new node
 747          * (setting replacepos and/or insertpos).
 748          */
 749         for (; cur != NULL; last = cur, cur = cur->next) {
 750                 if (strcmp(centry->name, cur->name) == 0) {
 751                         samename = cur;
 752                 }
 753                 if (mtree_Sflag) {
 754                         cmp = nodecmp(centry, cur);
 755                         if (cmp == 0) {
 756                                 replacepos = cur;
 757                         } else if (cmp > 0) {
 758                                 insertpos = cur;
 759                         }
 760                 }
 761         }
 762         if (! mtree_Sflag) {
 763                 if (samename != NULL) {
 764                         /* replace node with same name */
 765                         replacepos = samename;
 766                 } else {
 767                         /* add new node at end of list */
 768                         insertpos = last;
 769                 }
 770         }
 771
 772         if (samename != NULL) {
 773                 /*
 774                  * We found a node with the same name above.  Call
 775                  * replacenode(), which will either exit with an error,
 776                  * or replace the information in the samename node and
 777                  * free the information in the centry node.
 778                  */
 779                 replacenode(samename, centry);
 780                 if (samename == replacepos) {
 781                         /* The just-replaced node was in the correct position */
 782                         return;
 783                 }
 784                 if (samename == insertpos || samename->prev == insertpos) {
 785                         /*
 786                          * We thought the new node should be just before
 787                          * or just after the replaced node, but that would
 788                          * be equivalent to just retaining the replaced node.
 789                          */
 790                         return;
 791                 }
 792
 793                 /*
 794                  * The just-replaced node is in the wrong position in
 795                  * the list.  This can happen if sort order depends on
 796                  * criteria other than the node name.
 797                  *
 798                  * Make centry point to the just-replaced node.  Unlink
 799                  * the just-replaced node from the list, and allow it to
 800                  * be insterted in the correct position later.
 801                  */
 802                 centry = samename;
 803                 if (centry->prev)
 804                         centry->prev->next = centry->next;
 805                 else {
 806                         /* centry->next is the new head of the list */
 807                         pathparent->child = centry->next;
 808                         assert(centry->next != NULL);
 809                 }
 810                 if (centry->next)
 811                         centry->next->prev = centry->prev;
 812                 centry->prev = NULL;
 813                 centry->next = NULL;
 814         }
 815
 816         if (insertpos == NULL) {
 817                 /* insert centry at the beginning of the list */
 818                 pathparent->child->prev = centry;
 819                 centry->next = pathparent->child;
 820                 centry->prev = NULL;
 821                 pathparent->child = centry;
 822         } else {
 823                 /* insert centry into the list just after insertpos */
 824                 centry->next = insertpos->next;
 825                 insertpos->next = centry;
 826                 centry->prev = insertpos;
 827                 if (centry->next)
 828                         centry->next->prev = centry;
 829         }
 830         return;
 831 }
 832
 833 /*
 834  * nodecmp --
 835  *      used as a comparison function by addchild() to control the order
 836  *      in which entries appear within a list of sibling nodes.  We make
 837  *      directories sort after non-directories, but otherwise sort in
 838  *      strcmp() order.
 839  *
 840  * Keep this in sync with dcmp() in create.c.
 841  */
 842 static int
 843 nodecmp(const NODE *a, const NODE *b)
 844 {
 845
 846         if ((a->type & F_DIR) != 0) {
 847                 if ((b->type & F_DIR) == 0)
 848                         return 1;
 849         } else if ((b->type & F_DIR) != 0)
 850                 return -1;
 851         return strcmp(a->name, b->name);
 852 }