sbin/ldconfig/ldconfig.c

   1 /*
   2  * Copyright (c) 1993,1995 Paul Kranenburg
   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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Paul Kranenburg.
  16  * 4. The name of the author may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #ifndef lint
  32 static const char rcsid[] =
  33   "$FreeBSD$";
  34 #endif /* not lint */
  35
  36 #include <sys/param.h>
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39 #include <sys/mman.h>
  40 #include <a.out.h>
  41 #include <ctype.h>
  42 #include <dirent.h>
  43 #include <elf-hints.h>
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <fcntl.h>
  47 #include <sys/link_aout.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52
  53 #include "ldconfig.h"
  54 #include "shlib.h"
  55 #include "support.h"
  56
  57 #if DEBUG
  58 /* test */
  59 #undef _PATH_LD_HINTS
  60 #define _PATH_LD_HINTS          "./ld.so.hints"
  61 #undef _PATH_ELF_HINTS
  62 #define _PATH_ELF_HINTS         "./ld-elf.so.hints"
  63 #endif
  64
  65 #define _PATH_LD32_HINTS        "/var/run/ld32.so.hints"
  66 #define _PATH_ELF32_HINTS       "/var/run/ld-elf32.so.hints"
  67
  68 #undef major
  69 #undef minor
  70
  71 static int                      verbose;
  72 static int                      nostd;
  73 static int                      justread;
  74 static int                      merge;
  75 static int                      rescan;
  76 static const char               *hints_file;
  77
  78 struct shlib_list {
  79         /* Internal list of shared libraries found */
  80         char                    *name;
  81         char                    *path;
  82         int                     dewey[MAXDEWEY];
  83         int                     ndewey;
  84 #define major dewey[0]
  85 #define minor dewey[1]
  86         struct shlib_list       *next;
  87 };
  88
  89 static struct shlib_list        *shlib_head = NULL, **shlib_tail = &shlib_head;
  90 static char                     *dir_list;
  91
  92 static int              buildhints(void);
  93 static int              dodir(char *, int);
  94 int                     dofile(char *, int);
  95 static void             enter(char *, char *, char *, int *, int);
  96 static void             listhints(void);
  97 static int              readhints(void);
  98 static void             usage(void);
  99
 100 int
 101 main(int argc, char **argv)
 102 {
 103         int             i, c;
 104         int             rval = 0;
 105         int             is_aout = 0;
 106         int             is_32 = 0;
 107
 108         while (argc > 1) {
 109                 if (strcmp(argv[1], "-aout") == 0) {
 110                         is_aout = 1;
 111                         argc--;
 112                         argv++;
 113                 } else if (strcmp(argv[1], "-elf") == 0) {
 114                         is_aout = 0;
 115                         argc--;
 116                         argv++;
 117                 } else if (strcmp(argv[1], "-32") == 0) {
 118                         is_32 = 1;
 119                         argc--;
 120                         argv++;
 121                 } else {
 122                         break;
 123                 }
 124         }
 125
 126         if (is_32)
 127                 hints_file = is_aout ? _PATH_LD32_HINTS : _PATH_ELF32_HINTS;
 128         else
 129                 hints_file = is_aout ? _PATH_LD_HINTS : _PATH_ELF_HINTS;
 130         if (argc == 1)
 131                 rescan = 1;
 132         else while((c = getopt(argc, argv, "Rf:imrsv")) != -1) {
 133                 switch (c) {
 134                 case 'R':
 135                         rescan = 1;
 136                         break;
 137                 case 'f':
 138                         hints_file = optarg;
 139                         break;
 140                 case 'i':
 141                         insecure = 1;
 142                         break;
 143                 case 'm':
 144                         merge = 1;
 145                         break;
 146                 case 'r':
 147                         justread = 1;
 148                         break;
 149                 case 's':
 150                         nostd = 1;
 151                         break;
 152                 case 'v':
 153                         verbose = 1;
 154                         break;
 155                 default:
 156                         usage();
 157                         break;
 158                 }
 159         }
 160
 161         if (!is_aout) {
 162                 if (justread)
 163                         list_elf_hints(hints_file);
 164                 else
 165                         update_elf_hints(hints_file, argc - optind,
 166                             argv + optind, merge || rescan);
 167                 return 0;
 168         }
 169
 170         /* Here begins the aout libs processing */
 171         dir_list = strdup("");
 172
 173         if (justread || merge || rescan) {
 174                 if ((rval = readhints()) != 0)
 175                         return rval;
 176         }
 177
 178         if (!nostd && !merge && !rescan)
 179                 std_search_path();
 180
 181         /* Add any directories/files from the command line */
 182         if (!justread) {
 183                 for (i = optind; i < argc; i++) {
 184                         struct stat stbuf;
 185
 186                         if (stat(argv[i], &stbuf) == -1) {
 187                                 warn("%s", argv[i]);
 188                                 rval = -1;
 189                         } else if (strcmp(argv[i], "/usr/lib") == 0) {
 190                                 warnx("WARNING! '%s' can not be used", argv[i]);
 191                                 rval = -1;
 192                         } else {
 193                                 /*
 194                                  * See if this is a directory-containing
 195                                  * file instead of a directory
 196                                  */
 197                                 if (S_ISREG(stbuf.st_mode))
 198                                         rval |= dofile(argv[i], 0);
 199                                 else
 200                                         add_search_path(argv[i]);
 201                         }
 202                 }
 203         }
 204
 205         for (i = 0; i < n_search_dirs; i++) {
 206                 char *cp = concat(dir_list, *dir_list?":":"", search_dirs[i]);
 207                 free(dir_list);
 208                 dir_list = cp;
 209         }
 210
 211         if (justread) {
 212                 listhints();
 213                 return 0;
 214         }
 215
 216         for (i = 0; i < n_search_dirs; i++)
 217                 rval |= dodir(search_dirs[i], 1);
 218
 219         rval |= buildhints();
 220
 221         return rval;
 222 }
 223
 224 static void
 225 usage(void)
 226 {
 227         fprintf(stderr,
 228         "usage: ldconfig [-32] [-aout | -elf] [-Rimrsv] [-f hints_file] [directory | file ...]\n");
 229         exit(1);
 230 }
 231
 232 int
 233 dofile(char *fname, int silent)
 234 {
 235         FILE *hfp;
 236         char buf[MAXPATHLEN];
 237         int rval = 0;
 238         char *cp, *sp;
 239
 240         if ((hfp = fopen(fname, "r")) == NULL) {
 241                 warn("%s", fname);
 242                 return -1;
 243         }
 244
 245         while (fgets(buf, sizeof(buf), hfp)) {
 246                 cp = buf;
 247                 while (isspace(*cp))
 248                         cp++;
 249                 if (*cp == '#' || *cp == '\0')
 250                         continue;
 251                 sp = cp;
 252                 while (!isspace(*cp) && *cp != '\0')
 253                         cp++;
 254
 255                 if (*cp != '\n') {
 256                         *cp = '\0';
 257                         warnx("%s: trailing characters ignored", sp);
 258                 }
 259
 260                 *cp = '\0';
 261
 262                 rval |= dodir(sp, silent);
 263         }
 264
 265         (void)fclose(hfp);
 266         return rval;
 267 }
 268
 269 int
 270 dodir(char *dir, int silent)
 271 {
 272         DIR             *dd;
 273         struct dirent   *dp;
 274         char            name[MAXPATHLEN];
 275         int             dewey[MAXDEWEY], ndewey;
 276
 277         if ((dd = opendir(dir)) == NULL) {
 278                 if (silent && errno == ENOENT)  /* Ignore the error */
 279                         return 0;
 280                 warn("%s", dir);
 281                 return -1;
 282         }
 283
 284         while ((dp = readdir(dd)) != NULL) {
 285                 int n;
 286                 char *cp;
 287
 288                 /* Check for `lib' prefix */
 289                 if (dp->d_name[0] != 'l' ||
 290                     dp->d_name[1] != 'i' ||
 291                     dp->d_name[2] != 'b')
 292                         continue;
 293
 294                 /* Copy the entry minus prefix */
 295                 (void)strcpy(name, dp->d_name + 3);
 296                 n = strlen(name);
 297                 if (n < 4)
 298                         continue;
 299
 300                 /* Find ".so." in name */
 301                 for (cp = name + n - 4; cp > name; --cp) {
 302                         if (cp[0] == '.' &&
 303                             cp[1] == 's' &&
 304                             cp[2] == 'o' &&
 305                             cp[3] == '.')
 306                                 break;
 307                 }
 308                 if (cp <= name)
 309                         continue;
 310
 311                 *cp = '\0';
 312                 if (!isdigit(*(cp+4)))
 313                         continue;
 314
 315                 bzero((caddr_t)dewey, sizeof(dewey));
 316                 ndewey = getdewey(dewey, cp + 4);
 317                 if (ndewey < 2)
 318                         continue;
 319                 enter(dir, dp->d_name, name, dewey, ndewey);
 320         }
 321
 322         closedir(dd);
 323         return 0;
 324 }
 325
 326 static void
 327 enter(char *dir, char *file, char *name, int dewey[], int ndewey)
 328 {
 329         struct shlib_list       *shp;
 330
 331         for (shp = shlib_head; shp; shp = shp->next) {
 332                 if (strcmp(name, shp->name) != 0 || major != shp->major)
 333                         continue;
 334
 335                 /* Name matches existing entry */
 336                 if (cmpndewey(dewey, ndewey, shp->dewey, shp->ndewey) > 0) {
 337
 338                         /* Update this entry with higher versioned lib */
 339                         if (verbose)
 340                                 printf("Updating lib%s.%d.%d to %s/%s\n",
 341                                         shp->name, shp->major, shp->minor,
 342                                         dir, file);
 343
 344                         free(shp->name);
 345                         shp->name = strdup(name);
 346                         free(shp->path);
 347                         shp->path = concat(dir, "/", file);
 348                         bcopy(dewey, shp->dewey, sizeof(shp->dewey));
 349                         shp->ndewey = ndewey;
 350                 }
 351                 break;
 352         }
 353
 354         if (shp)
 355                 /* Name exists: older version or just updated */
 356                 return;
 357
 358         /* Allocate new list element */
 359         if (verbose)
 360                 printf("Adding %s/%s\n", dir, file);
 361
 362         shp = (struct shlib_list *)xmalloc(sizeof *shp);
 363         shp->name = strdup(name);
 364         shp->path = concat(dir, "/", file);
 365         bcopy(dewey, shp->dewey, sizeof(shp->dewey));
 366         shp->ndewey = ndewey;
 367         shp->next = NULL;
 368
 369         *shlib_tail = shp;
 370         shlib_tail = &shp->next;
 371 }
 372
 373
 374 static int
 375 hinthash(char *cp, int vmajor)
 376 {
 377         int     k = 0;
 378
 379         while (*cp)
 380                 k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
 381
 382         k = (((k << 1) + (k >> 14)) ^ (vmajor*257)) & 0x3fff;
 383
 384         return k;
 385 }
 386
 387 int
 388 buildhints(void)
 389 {
 390         struct hints_header     hdr;
 391         struct hints_bucket     *blist;
 392         struct shlib_list       *shp;
 393         char                    *strtab;
 394         int                     i, n, str_index = 0;
 395         int                     strtab_sz = 0;  /* Total length of strings */
 396         int                     nhints = 0;     /* Total number of hints */
 397         int                     fd;
 398         char                    *tmpfilename;
 399
 400         for (shp = shlib_head; shp; shp = shp->next) {
 401                 strtab_sz += 1 + strlen(shp->name);
 402                 strtab_sz += 1 + strlen(shp->path);
 403                 nhints++;
 404         }
 405
 406         /* Fill hints file header */
 407         hdr.hh_magic = HH_MAGIC;
 408         hdr.hh_version = LD_HINTS_VERSION_2;
 409         hdr.hh_nbucket = 1 * nhints;
 410         n = hdr.hh_nbucket * sizeof(struct hints_bucket);
 411         hdr.hh_hashtab = sizeof(struct hints_header);
 412         hdr.hh_strtab = hdr.hh_hashtab + n;
 413         hdr.hh_dirlist = strtab_sz;
 414         strtab_sz += 1 + strlen(dir_list);
 415         hdr.hh_strtab_sz = strtab_sz;
 416         hdr.hh_ehints = hdr.hh_strtab + hdr.hh_strtab_sz;
 417
 418         if (verbose)
 419                 printf("Totals: entries %d, buckets %ld, string size %d\n",
 420                         nhints, (long)hdr.hh_nbucket, strtab_sz);
 421
 422         /* Allocate buckets and string table */
 423         blist = (struct hints_bucket *)xmalloc(n);
 424         bzero((char *)blist, n);
 425         for (i = 0; i < hdr.hh_nbucket; i++)
 426                 /* Empty all buckets */
 427                 blist[i].hi_next = -1;
 428
 429         strtab = (char *)xmalloc(strtab_sz);
 430
 431         /* Enter all */
 432         for (shp = shlib_head; shp; shp = shp->next) {
 433                 struct hints_bucket     *bp;
 434
 435                 bp = blist +
 436                   (hinthash(shp->name, shp->major) % hdr.hh_nbucket);
 437
 438                 if (bp->hi_pathx) {
 439                         int     j;
 440
 441                         for (j = 0; j < hdr.hh_nbucket; j++) {
 442                                 if (blist[j].hi_pathx == 0)
 443                                         break;
 444                         }
 445                         if (j == hdr.hh_nbucket) {
 446                                 warnx("bummer!");
 447                                 return -1;
 448                         }
 449                         while (bp->hi_next != -1)
 450                                 bp = &blist[bp->hi_next];
 451                         bp->hi_next = j;
 452                         bp = blist + j;
 453                 }
 454
 455                 /* Insert strings in string table */
 456                 bp->hi_namex = str_index;
 457                 strcpy(strtab + str_index, shp->name);
 458                 str_index += 1 + strlen(shp->name);
 459
 460                 bp->hi_pathx = str_index;
 461                 strcpy(strtab + str_index, shp->path);
 462                 str_index += 1 + strlen(shp->path);
 463
 464                 /* Copy versions */
 465                 bcopy(shp->dewey, bp->hi_dewey, sizeof(bp->hi_dewey));
 466                 bp->hi_ndewey = shp->ndewey;
 467         }
 468
 469         /* Copy search directories */
 470         strcpy(strtab + str_index, dir_list);
 471         str_index += 1 + strlen(dir_list);
 472
 473         /* Sanity check */
 474         if (str_index != strtab_sz) {
 475                 errx(1, "str_index(%d) != strtab_sz(%d)", str_index, strtab_sz);
 476         }
 477
 478         tmpfilename = concat(hints_file, ".XXXXXXXXXX", "");
 479         umask(0);       /* Create with exact permissions */
 480         if ((fd = mkstemp(tmpfilename)) == -1) {
 481                 warn("%s", tmpfilename);
 482                 return -1;
 483         }
 484         fchmod(fd, 0444);
 485
 486         if (write(fd, &hdr, sizeof(struct hints_header)) !=
 487                                                 sizeof(struct hints_header)) {
 488                 warn("%s", hints_file);
 489                 return -1;
 490         }
 491         if (write(fd, blist, hdr.hh_nbucket * sizeof(*blist)) !=
 492                                 (ssize_t)(hdr.hh_nbucket * sizeof(*blist))) {
 493                 warn("%s", hints_file);
 494                 return -1;
 495         }
 496         if (write(fd, strtab, strtab_sz) != strtab_sz) {
 497                 warn("%s", hints_file);
 498                 return -1;
 499         }
 500         if (close(fd) != 0) {
 501                 warn("%s", hints_file);
 502                 return -1;
 503         }
 504
 505         /* Install it */
 506         if (unlink(hints_file) != 0 && errno != ENOENT) {
 507                 warn("%s", hints_file);
 508                 return -1;
 509         }
 510
 511         if (rename(tmpfilename, hints_file) != 0) {
 512                 warn("%s", hints_file);
 513                 return -1;
 514         }
 515
 516         return 0;
 517 }
 518
 519 static int
 520 readhints(void)
 521 {
 522         int                     fd;
 523         void                    *addr;
 524         long                    fsize;
 525         long                    msize;
 526         struct hints_header     *hdr;
 527         struct hints_bucket     *blist;
 528         char                    *strtab;
 529         struct shlib_list       *shp;
 530         int                     i;
 531
 532         if ((fd = open(hints_file, O_RDONLY, 0)) == -1) {
 533                 warn("%s", hints_file);
 534                 return -1;
 535         }
 536
 537         msize = PAGE_SIZE;
 538         addr = mmap(0, msize, PROT_READ, MAP_COPY, fd, 0);
 539
 540         if (addr == MAP_FAILED) {
 541                 warn("%s", hints_file);
 542                 return -1;
 543         }
 544
 545         hdr = (struct hints_header *)addr;
 546         if (HH_BADMAG(*hdr)) {
 547                 warnx("%s: bad magic: %lo", hints_file,
 548                         (unsigned long)hdr->hh_magic);
 549                 return -1;
 550         }
 551
 552         if (hdr->hh_version != LD_HINTS_VERSION_1 &&
 553             hdr->hh_version != LD_HINTS_VERSION_2) {
 554                 warnx("unsupported version: %ld", (long)hdr->hh_version);
 555                 return -1;
 556         }
 557
 558         if (hdr->hh_ehints > msize) {
 559                 fsize = hdr->hh_ehints;
 560                 munmap(addr, msize);
 561                 addr = mmap(0, fsize, PROT_READ, MAP_COPY, fd, 0);
 562                 if (addr == MAP_FAILED) {
 563                         warn("%s", hints_file);
 564                         return -1;
 565                 }
 566                 hdr = (struct hints_header *)addr;
 567         }
 568         close(fd);
 569
 570         strtab = (char *)addr + hdr->hh_strtab;
 571
 572         if (hdr->hh_version >= LD_HINTS_VERSION_2)
 573                 add_search_path(strtab + hdr->hh_dirlist);
 574         else if (rescan)
 575                 errx(1, "%s too old and does not contain the search path",
 576                         hints_file);
 577
 578         if (rescan)
 579                 return 0;
 580
 581         blist = malloc(sizeof(*blist) * hdr->hh_nbucket);
 582         if (blist == NULL)
 583                 err(1, "readhints");
 584         memcpy(blist, (char *)addr + hdr->hh_hashtab,
 585                 sizeof(*blist) * hdr->hh_nbucket);
 586
 587
 588         for (i = 0; i < hdr->hh_nbucket; i++) {
 589                 struct hints_bucket     *bp = &blist[i];
 590
 591                 /* Sanity check */
 592                 if (bp->hi_namex >= hdr->hh_strtab_sz) {
 593                         warnx("bad name index: %#x", bp->hi_namex);
 594                         free(blist);
 595                         return -1;
 596                 }
 597                 if (bp->hi_pathx >= hdr->hh_strtab_sz) {
 598                         warnx("bad path index: %#x", bp->hi_pathx);
 599                         free(blist);
 600                         return -1;
 601                 }
 602
 603                 /* Allocate new list element */
 604                 shp = (struct shlib_list *)xmalloc(sizeof *shp);
 605                 shp->name = strdup(strtab + bp->hi_namex);
 606                 shp->path = strdup(strtab + bp->hi_pathx);
 607                 bcopy(bp->hi_dewey, shp->dewey, sizeof(shp->dewey));
 608                 shp->ndewey = bp->hi_ndewey;
 609                 shp->next = NULL;
 610
 611                 *shlib_tail = shp;
 612                 shlib_tail = &shp->next;
 613         }
 614
 615         free(blist);
 616         return 0;
 617 }
 618
 619 static void
 620 listhints(void)
 621 {
 622         struct shlib_list       *shp;
 623         int                     i;
 624
 625         printf("%s:\n", hints_file);
 626         printf("\tsearch directories: %s\n", dir_list);
 627
 628         for (i = 0, shp = shlib_head; shp; i++, shp = shp->next)
 629                 printf("\t%d:-l%s.%d.%d => %s\n",
 630                         i, shp->name, shp->major, shp->minor, shp->path);
 631
 632         return;
 633 }