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 /*
 101  * Note on aout/a.out support.
 102  * To properly support shared libraries for compat2x, which are a.out, we need
 103  * to support a.out here.  As of 2013, bug reports are still coming in for this
 104  * feature (on amd64 no less), so we know it is still in use.
 105  */
 106
 107 int
 108 main(int argc, char **argv)
 109 {
 110         int             i, c;
 111         int             rval = 0;
 112         int             is_aout = 0;
 113         int             is_32 = 0;
 114
 115         while (argc > 1) {
 116                 if (strcmp(argv[1], "-aout") == 0) {
 117                         is_aout = 1;
 118                         argc--;
 119                         argv++;
 120                 } else if (strcmp(argv[1], "-elf") == 0) {
 121                         is_aout = 0;
 122                         argc--;
 123                         argv++;
 124                 } else if (strcmp(argv[1], "-32") == 0) {
 125                         is_32 = 1;
 126                         argc--;
 127                         argv++;
 128                 } else {
 129                         break;
 130                 }
 131         }
 132
 133         if (is_32)
 134                 hints_file = is_aout ? _PATH_LD32_HINTS : _PATH_ELF32_HINTS;
 135         else
 136                 hints_file = is_aout ? _PATH_LD_HINTS : _PATH_ELF_HINTS;
 137         if (argc == 1)
 138                 rescan = 1;
 139         else while((c = getopt(argc, argv, "Rf:imrsv")) != -1) {
 140                 switch (c) {
 141                 case 'R':
 142                         rescan = 1;
 143                         break;
 144                 case 'f':
 145                         hints_file = optarg;
 146                         break;
 147                 case 'i':
 148                         insecure = 1;
 149                         break;
 150                 case 'm':
 151                         merge = 1;
 152                         break;
 153                 case 'r':
 154                         justread = 1;
 155                         break;
 156                 case 's':
 157                         nostd = 1;
 158                         break;
 159                 case 'v':
 160                         verbose = 1;
 161                         break;
 162                 default:
 163                         usage();
 164                         break;
 165                 }
 166         }
 167
 168         if (!is_aout) {
 169                 if (justread)
 170                         list_elf_hints(hints_file);
 171                 else
 172                         update_elf_hints(hints_file, argc - optind,
 173                             argv + optind, merge || rescan);
 174                 return 0;
 175         }
 176
 177         /* Here begins the aout libs processing */
 178         dir_list = strdup("");
 179
 180         if (justread || merge || rescan) {
 181                 if ((rval = readhints()) != 0)
 182                         return rval;
 183         }
 184
 185         if (!nostd && !merge && !rescan)
 186                 std_search_path();
 187
 188         /* Add any directories/files from the command line */
 189         if (!justread) {
 190                 for (i = optind; i < argc; i++) {
 191                         struct stat stbuf;
 192
 193                         if (stat(argv[i], &stbuf) == -1) {
 194                                 warn("%s", argv[i]);
 195                                 rval = -1;
 196                         } else if (strcmp(argv[i], "/usr/lib") == 0) {
 197                                 warnx("WARNING! '%s' can not be used", argv[i]);
 198                                 rval = -1;
 199                         } else {
 200                                 /*
 201                                  * See if this is a directory-containing
 202                                  * file instead of a directory
 203                                  */
 204                                 if (S_ISREG(stbuf.st_mode))
 205                                         rval |= dofile(argv[i], 0);
 206                                 else
 207                                         add_search_path(argv[i]);
 208                         }
 209                 }
 210         }
 211
 212         for (i = 0; i < n_search_dirs; i++) {
 213                 char *cp = concat(dir_list, *dir_list?":":"", search_dirs[i]);
 214                 free(dir_list);
 215                 dir_list = cp;
 216         }
 217
 218         if (justread) {
 219                 listhints();
 220                 return 0;
 221         }
 222
 223         for (i = 0; i < n_search_dirs; i++)
 224                 rval |= dodir(search_dirs[i], 1);
 225
 226         rval |= buildhints();
 227
 228         return rval;
 229 }
 230
 231 static void
 232 usage(void)
 233 {
 234         fprintf(stderr,
 235         "usage: ldconfig [-32] [-aout | -elf] [-Rimrsv] [-f hints_file] [directory | file ...]\n");
 236         exit(1);
 237 }
 238
 239 int
 240 dofile(char *fname, int silent)
 241 {
 242         FILE *hfp;
 243         char buf[MAXPATHLEN];
 244         int rval = 0;
 245         char *cp, *sp;
 246
 247         if ((hfp = fopen(fname, "r")) == NULL) {
 248                 warn("%s", fname);
 249                 return -1;
 250         }
 251
 252         while (fgets(buf, sizeof(buf), hfp)) {
 253                 cp = buf;
 254                 while (isspace(*cp))
 255                         cp++;
 256                 if (*cp == '#' || *cp == '\0')
 257                         continue;
 258                 sp = cp;
 259                 while (!isspace(*cp) && *cp != '\0')
 260                         cp++;
 261
 262                 if (*cp != '\n') {
 263                         *cp = '\0';
 264                         warnx("%s: trailing characters ignored", sp);
 265                 }
 266
 267                 *cp = '\0';
 268
 269                 rval |= dodir(sp, silent);
 270         }
 271
 272         (void)fclose(hfp);
 273         return rval;
 274 }
 275
 276 int
 277 dodir(char *dir, int silent)
 278 {
 279         DIR             *dd;
 280         struct dirent   *dp;
 281         char            name[MAXPATHLEN];
 282         int             dewey[MAXDEWEY], ndewey;
 283
 284         if ((dd = opendir(dir)) == NULL) {
 285                 if (silent && errno == ENOENT)  /* Ignore the error */
 286                         return 0;
 287                 warn("%s", dir);
 288                 return -1;
 289         }
 290
 291         while ((dp = readdir(dd)) != NULL) {
 292                 int n;
 293                 char *cp;
 294
 295                 /* Check for `lib' prefix */
 296                 if (dp->d_name[0] != 'l' ||
 297                     dp->d_name[1] != 'i' ||
 298                     dp->d_name[2] != 'b')
 299                         continue;
 300
 301                 /* Copy the entry minus prefix */
 302                 (void)strcpy(name, dp->d_name + 3);
 303                 n = strlen(name);
 304                 if (n < 4)
 305                         continue;
 306
 307                 /* Find ".so." in name */
 308                 for (cp = name + n - 4; cp > name; --cp) {
 309                         if (cp[0] == '.' &&
 310                             cp[1] == 's' &&
 311                             cp[2] == 'o' &&
 312                             cp[3] == '.')
 313                                 break;
 314                 }
 315                 if (cp <= name)
 316                         continue;
 317
 318                 *cp = '\0';
 319                 if (!isdigit(*(cp+4)))
 320                         continue;
 321
 322                 bzero((caddr_t)dewey, sizeof(dewey));
 323                 ndewey = getdewey(dewey, cp + 4);
 324                 if (ndewey < 2)
 325                         continue;
 326                 enter(dir, dp->d_name, name, dewey, ndewey);
 327         }
 328
 329         closedir(dd);
 330         return 0;
 331 }
 332
 333 static void
 334 enter(char *dir, char *file, char *name, int dewey[], int ndewey)
 335 {
 336         struct shlib_list       *shp;
 337
 338         for (shp = shlib_head; shp; shp = shp->next) {
 339                 if (strcmp(name, shp->name) != 0 || major != shp->major)
 340                         continue;
 341
 342                 /* Name matches existing entry */
 343                 if (cmpndewey(dewey, ndewey, shp->dewey, shp->ndewey) > 0) {
 344
 345                         /* Update this entry with higher versioned lib */
 346                         if (verbose)
 347                                 printf("Updating lib%s.%d.%d to %s/%s\n",
 348                                         shp->name, shp->major, shp->minor,
 349                                         dir, file);
 350
 351                         free(shp->name);
 352                         shp->name = strdup(name);
 353                         free(shp->path);
 354                         shp->path = concat(dir, "/", file);
 355                         bcopy(dewey, shp->dewey, sizeof(shp->dewey));
 356                         shp->ndewey = ndewey;
 357                 }
 358                 break;
 359         }
 360
 361         if (shp)
 362                 /* Name exists: older version or just updated */
 363                 return;
 364
 365         /* Allocate new list element */
 366         if (verbose)
 367                 printf("Adding %s/%s\n", dir, file);
 368
 369         shp = (struct shlib_list *)xmalloc(sizeof *shp);
 370         shp->name = strdup(name);
 371         shp->path = concat(dir, "/", file);
 372         bcopy(dewey, shp->dewey, sizeof(shp->dewey));
 373         shp->ndewey = ndewey;
 374         shp->next = NULL;
 375
 376         *shlib_tail = shp;
 377         shlib_tail = &shp->next;
 378 }
 379
 380
 381 static int
 382 hinthash(char *cp, int vmajor)
 383 {
 384         int     k = 0;
 385
 386         while (*cp)
 387                 k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
 388
 389         k = (((k << 1) + (k >> 14)) ^ (vmajor*257)) & 0x3fff;
 390
 391         return k;
 392 }
 393
 394 int
 395 buildhints(void)
 396 {
 397         struct hints_header     hdr;
 398         struct hints_bucket     *blist;
 399         struct shlib_list       *shp;
 400         char                    *strtab;
 401         int                     i, n, str_index = 0;
 402         int                     strtab_sz = 0;  /* Total length of strings */
 403         int                     nhints = 0;     /* Total number of hints */
 404         int                     fd;
 405         char                    *tmpfilename;
 406
 407         for (shp = shlib_head; shp; shp = shp->next) {
 408                 strtab_sz += 1 + strlen(shp->name);
 409                 strtab_sz += 1 + strlen(shp->path);
 410                 nhints++;
 411         }
 412
 413         /* Fill hints file header */
 414         hdr.hh_magic = HH_MAGIC;
 415         hdr.hh_version = LD_HINTS_VERSION_2;
 416         hdr.hh_nbucket = 1 * nhints;
 417         n = hdr.hh_nbucket * sizeof(struct hints_bucket);
 418         hdr.hh_hashtab = sizeof(struct hints_header);
 419         hdr.hh_strtab = hdr.hh_hashtab + n;
 420         hdr.hh_dirlist = strtab_sz;
 421         strtab_sz += 1 + strlen(dir_list);
 422         hdr.hh_strtab_sz = strtab_sz;
 423         hdr.hh_ehints = hdr.hh_strtab + hdr.hh_strtab_sz;
 424
 425         if (verbose)
 426                 printf("Totals: entries %d, buckets %ld, string size %d\n",
 427                         nhints, (long)hdr.hh_nbucket, strtab_sz);
 428
 429         /* Allocate buckets and string table */
 430         blist = (struct hints_bucket *)xmalloc(n);
 431         bzero((char *)blist, n);
 432         for (i = 0; i < hdr.hh_nbucket; i++)
 433                 /* Empty all buckets */
 434                 blist[i].hi_next = -1;
 435
 436         strtab = (char *)xmalloc(strtab_sz);
 437
 438         /* Enter all */
 439         for (shp = shlib_head; shp; shp = shp->next) {
 440                 struct hints_bucket     *bp;
 441
 442                 bp = blist +
 443                   (hinthash(shp->name, shp->major) % hdr.hh_nbucket);
 444
 445                 if (bp->hi_pathx) {
 446                         int     j;
 447
 448                         for (j = 0; j < hdr.hh_nbucket; j++) {
 449                                 if (blist[j].hi_pathx == 0)
 450                                         break;
 451                         }
 452                         if (j == hdr.hh_nbucket) {
 453                                 warnx("bummer!");
 454                                 return -1;
 455                         }
 456                         while (bp->hi_next != -1)
 457                                 bp = &blist[bp->hi_next];
 458                         bp->hi_next = j;
 459                         bp = blist + j;
 460                 }
 461
 462                 /* Insert strings in string table */
 463                 bp->hi_namex = str_index;
 464                 strcpy(strtab + str_index, shp->name);
 465                 str_index += 1 + strlen(shp->name);
 466
 467                 bp->hi_pathx = str_index;
 468                 strcpy(strtab + str_index, shp->path);
 469                 str_index += 1 + strlen(shp->path);
 470
 471                 /* Copy versions */
 472                 bcopy(shp->dewey, bp->hi_dewey, sizeof(bp->hi_dewey));
 473                 bp->hi_ndewey = shp->ndewey;
 474         }
 475
 476         /* Copy search directories */
 477         strcpy(strtab + str_index, dir_list);
 478         str_index += 1 + strlen(dir_list);
 479
 480         /* Sanity check */
 481         if (str_index != strtab_sz) {
 482                 errx(1, "str_index(%d) != strtab_sz(%d)", str_index, strtab_sz);
 483         }
 484
 485         tmpfilename = concat(hints_file, ".XXXXXXXXXX", "");
 486         umask(0);       /* Create with exact permissions */
 487         if ((fd = mkstemp(tmpfilename)) == -1) {
 488                 warn("%s", tmpfilename);
 489                 return -1;
 490         }
 491         fchmod(fd, 0444);
 492
 493         if (write(fd, &hdr, sizeof(struct hints_header)) !=
 494                                                 sizeof(struct hints_header)) {
 495                 warn("%s", hints_file);
 496                 return -1;
 497         }
 498         if (write(fd, blist, hdr.hh_nbucket * sizeof(*blist)) !=
 499                                 (ssize_t)(hdr.hh_nbucket * sizeof(*blist))) {
 500                 warn("%s", hints_file);
 501                 return -1;
 502         }
 503         if (write(fd, strtab, strtab_sz) != strtab_sz) {
 504                 warn("%s", hints_file);
 505                 return -1;
 506         }
 507         if (close(fd) != 0) {
 508                 warn("%s", hints_file);
 509                 return -1;
 510         }
 511
 512         /* Install it */
 513         if (unlink(hints_file) != 0 && errno != ENOENT) {
 514                 warn("%s", hints_file);
 515                 return -1;
 516         }
 517
 518         if (rename(tmpfilename, hints_file) != 0) {
 519                 warn("%s", hints_file);
 520                 return -1;
 521         }
 522
 523         return 0;
 524 }
 525
 526 static int
 527 readhints(void)
 528 {
 529         int                     fd;
 530         void                    *addr;
 531         long                    fsize;
 532         long                    msize;
 533         struct hints_header     *hdr;
 534         struct hints_bucket     *blist;
 535         char                    *strtab;
 536         struct shlib_list       *shp;
 537         int                     i;
 538
 539         if ((fd = open(hints_file, O_RDONLY, 0)) == -1) {
 540                 warn("%s", hints_file);
 541                 return -1;
 542         }
 543
 544         msize = PAGE_SIZE;
 545         addr = mmap(0, msize, PROT_READ, MAP_COPY, fd, 0);
 546
 547         if (addr == MAP_FAILED) {
 548                 warn("%s", hints_file);
 549                 return -1;
 550         }
 551
 552         hdr = (struct hints_header *)addr;
 553         if (HH_BADMAG(*hdr)) {
 554                 warnx("%s: bad magic: %lo", hints_file,
 555                         (unsigned long)hdr->hh_magic);
 556                 return -1;
 557         }
 558
 559         if (hdr->hh_version != LD_HINTS_VERSION_1 &&
 560             hdr->hh_version != LD_HINTS_VERSION_2) {
 561                 warnx("unsupported version: %ld", (long)hdr->hh_version);
 562                 return -1;
 563         }
 564
 565         if (hdr->hh_ehints > msize) {
 566                 fsize = hdr->hh_ehints;
 567                 munmap(addr, msize);
 568                 addr = mmap(0, fsize, PROT_READ, MAP_COPY, fd, 0);
 569                 if (addr == MAP_FAILED) {
 570                         warn("%s", hints_file);
 571                         return -1;
 572                 }
 573                 hdr = (struct hints_header *)addr;
 574         }
 575         close(fd);
 576
 577         strtab = (char *)addr + hdr->hh_strtab;
 578
 579         if (hdr->hh_version >= LD_HINTS_VERSION_2)
 580                 add_search_path(strtab + hdr->hh_dirlist);
 581         else if (rescan)
 582                 errx(1, "%s too old and does not contain the search path",
 583                         hints_file);
 584
 585         if (rescan)
 586                 return 0;
 587
 588         blist = malloc(sizeof(*blist) * hdr->hh_nbucket);
 589         if (blist == NULL)
 590                 err(1, "readhints");
 591         memcpy(blist, (char *)addr + hdr->hh_hashtab,
 592                 sizeof(*blist) * hdr->hh_nbucket);
 593
 594
 595         for (i = 0; i < hdr->hh_nbucket; i++) {
 596                 struct hints_bucket     *bp = &blist[i];
 597
 598                 /* Sanity check */
 599                 if (bp->hi_namex >= hdr->hh_strtab_sz) {
 600                         warnx("bad name index: %#x", bp->hi_namex);
 601                         free(blist);
 602                         return -1;
 603                 }
 604                 if (bp->hi_pathx >= hdr->hh_strtab_sz) {
 605                         warnx("bad path index: %#x", bp->hi_pathx);
 606                         free(blist);
 607                         return -1;
 608                 }
 609
 610                 /* Allocate new list element */
 611                 shp = (struct shlib_list *)xmalloc(sizeof *shp);
 612                 shp->name = strdup(strtab + bp->hi_namex);
 613                 shp->path = strdup(strtab + bp->hi_pathx);
 614                 bcopy(bp->hi_dewey, shp->dewey, sizeof(shp->dewey));
 615                 shp->ndewey = bp->hi_ndewey;
 616                 shp->next = NULL;
 617
 618                 *shlib_tail = shp;
 619                 shlib_tail = &shp->next;
 620         }
 621
 622         free(blist);
 623         return 0;
 624 }
 625
 626 static void
 627 listhints(void)
 628 {
 629         struct shlib_list       *shp;
 630         int                     i;
 631
 632         printf("%s:\n", hints_file);
 633         printf("\tsearch directories: %s\n", dir_list);
 634
 635         for (i = 0, shp = shlib_head; shp; i++, shp = shp->next)
 636                 printf("\t%d:-l%s.%d.%d => %s\n",
 637                         i, shp->name, shp->major, shp->minor, shp->path);
 638
 639         return;
 640 }