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  * $FreeBSD: src/sbin/ldconfig/ldconfig.c,v 1.31.2.3 2001/07/11 23:59:10 obrien Exp $
  31  * $DragonFly: src/sbin/ldconfig/ldconfig.c,v 1.4 2003/11/01 17:16:00 drhodus Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #include <sys/mman.h>
  38 #include <a.out.h>
  39 #include <ctype.h>
  40 #include <dirent.h>
  41 #include <elf-hints.h>
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <fcntl.h>
  45 #include <link.h>
  46 #include <objformat.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51
  52 #include "ldconfig.h"
  53 #include "shlib.h"
  54 #include "support.h"
  55
  56 #if DEBUG
  57 /* test */
  58 #undef _PATH_LD_HINTS
  59 #define _PATH_LD_HINTS          "./ld.so.hints"
  60 #undef _PATH_ELF_HINTS
  61 #define _PATH_ELF_HINTS         "./ld-elf.so.hints"
  62 #endif
  63
  64 #undef major
  65 #undef minor
  66
  67 static int                      verbose;
  68 static int                      nostd;
  69 static int                      justread;
  70 static int                      merge;
  71 static int                      rescan;
  72 static char                     *hints_file;
  73
  74 struct shlib_list {
  75         /* Internal list of shared libraries found */
  76         char                    *name;
  77         char                    *path;
  78         int                     dewey[MAXDEWEY];
  79         int                     ndewey;
  80 #define major dewey[0]
  81 #define minor dewey[1]
  82         struct shlib_list       *next;
  83 };
  84
  85 static struct shlib_list        *shlib_head = NULL, **shlib_tail = &shlib_head;
  86 static char                     *dir_list;
  87
  88 static int              buildhints(void);
  89 static int              dodir(char *, int);
  90 int                     dofile(char *, int);
  91 static void             enter(char *, char *, char *, int *, int);
  92 static void             listhints(void);
  93 static int              readhints(void);
  94 static void             usage(void);
  95
  96 int
  97 main(int argc, char **argv)
  98 {
  99         int             i, c;
 100         int             rval = 0;
 101         char            objformat[32];
 102         int             is_aout;
 103
 104         if (getobjformat(objformat, sizeof objformat, &argc, argv) == -1)
 105                 errx(1, "getobjformat failed: name too long");
 106         if (strcmp(objformat, "aout") == 0)
 107                 is_aout = 1;
 108         else if (strcmp(objformat, "elf") == 0)
 109                 is_aout = 0;
 110         else
 111                 errx(1, "unknown object format \"%s\"", objformat);
 112
 113         hints_file = is_aout ? _PATH_LD_HINTS : _PATH_ELF_HINTS;
 114         if (argc == 1)
 115                 rescan = 1;
 116         else while((c = getopt(argc, argv, "Rf:imrsv")) != -1) {
 117                 switch (c) {
 118                 case 'R':
 119                         rescan = 1;
 120                         break;
 121                 case 'f':
 122                         hints_file = optarg;
 123                         break;
 124                 case 'i':
 125                         insecure = 1;
 126                         break;
 127                 case 'm':
 128                         merge = 1;
 129                         break;
 130                 case 'r':
 131                         justread = 1;
 132                         break;
 133                 case 's':
 134                         nostd = 1;
 135                         break;
 136                 case 'v':
 137                         verbose = 1;
 138                         break;
 139                 default:
 140                         usage();
 141                         break;
 142                 }
 143         }
 144
 145         if (!is_aout) {
 146                 if (justread)
 147                         list_elf_hints(hints_file);
 148                 else
 149                         update_elf_hints(hints_file, argc - optind,
 150                             argv + optind, merge || rescan);
 151                 return 0;
 152         }
 153
 154         /* Here begins the aout libs processing */
 155         dir_list = strdup("");
 156
 157         if (justread || merge || rescan) {
 158                 if ((rval = readhints()) != 0)
 159                         return rval;
 160         }
 161
 162         if (!nostd && !merge && !rescan)
 163                 std_search_path();
 164
 165         /* Add any directories/files from the command line */
 166         if (!justread) {
 167                 for (i = optind; i < argc; i++) {
 168                         struct stat stbuf;
 169
 170                         if (stat(argv[i], &stbuf) == -1) {
 171                                 warn("%s", argv[i]);
 172                                 rval = -1;
 173                         } else if (strcmp(argv[i], "/usr/lib") == 0) {
 174                                 warnx("WARNING! '%s' can not be used", argv[i]);
 175                                 rval = -1;
 176                         } else {
 177                                 /*
 178                                  * See if this is a directory-containing
 179                                  * file instead of a directory
 180                                  */
 181                                 if (S_ISREG(stbuf.st_mode))
 182                                         rval |= dofile(argv[i], 0);
 183                                 else
 184                                         add_search_path(argv[i]);
 185                         }
 186                 }
 187         }
 188
 189         for (i = 0; i < n_search_dirs; i++) {
 190                 char *cp = concat(dir_list, *dir_list?":":"", search_dirs[i]);
 191                 free(dir_list);
 192                 dir_list = cp;
 193         }
 194
 195         if (justread) {
 196                 listhints();
 197                 return 0;
 198         }
 199
 200         for (i = 0; i < n_search_dirs; i++)
 201                 rval |= dodir(search_dirs[i], 1);
 202
 203         rval |= buildhints();
 204
 205         return rval;
 206 }
 207
 208 static void
 209 usage(void)
 210 {
 211         fprintf(stderr,
 212         "usage: ldconfig [-aout | -elf] [-Rimrsv] [-f hints_file] [dir | file ...]\n");
 213         exit(1);
 214 }
 215
 216 int
 217 dofile(char *fname, int silent)
 218 {
 219         FILE *hfp;
 220         char buf[MAXPATHLEN];
 221         int rval = 0;
 222         char *cp, *sp;
 223
 224         if ((hfp = fopen(fname, "r")) == NULL) {
 225                 warn("%s", fname);
 226                 return -1;
 227         }
 228
 229         while (fgets(buf, sizeof(buf), hfp)) {
 230                 cp = buf;
 231                 while (isspace(*cp))
 232                         cp++;
 233                 if (*cp == '#' || *cp == '\0')
 234                         continue;
 235                 sp = cp;
 236                 while (!isspace(*cp) && *cp != '\0')
 237                         cp++;
 238
 239                 if (*cp != '\n') {
 240                         *cp = '\0';
 241                         warnx("%s: trailing characters ignored", sp);
 242                 }
 243
 244                 *cp = '\0';
 245
 246                 rval |= dodir(sp, silent);
 247         }
 248
 249         (void)fclose(hfp);
 250         return rval;
 251 }
 252
 253 int
 254 dodir(char *dir, int silent)
 255 {
 256         DIR             *dd;
 257         struct dirent   *dp;
 258         char            name[MAXPATHLEN];
 259         int             dewey[MAXDEWEY], ndewey;
 260
 261         if ((dd = opendir(dir)) == NULL) {
 262                 if (silent && errno == ENOENT)  /* Ignore the error */
 263                         return 0;
 264                 warn("%s", dir);
 265                 return -1;
 266         }
 267
 268         while ((dp = readdir(dd)) != NULL) {
 269                 register int n;
 270                 register char *cp;
 271
 272                 /* Check for `lib' prefix */
 273                 if (dp->d_name[0] != 'l' ||
 274                     dp->d_name[1] != 'i' ||
 275                     dp->d_name[2] != 'b')
 276                         continue;
 277
 278                 /* Copy the entry minus prefix */
 279                 (void)strcpy(name, dp->d_name + 3);
 280                 n = strlen(name);
 281                 if (n < 4)
 282                         continue;
 283
 284                 /* Find ".so." in name */
 285                 for (cp = name + n - 4; cp > name; --cp) {
 286                         if (cp[0] == '.' &&
 287                             cp[1] == 's' &&
 288                             cp[2] == 'o' &&
 289                             cp[3] == '.')
 290                                 break;
 291                 }
 292                 if (cp <= name)
 293                         continue;
 294
 295                 *cp = '\0';
 296                 if (!isdigit(*(cp+4)))
 297                         continue;
 298
 299                 bzero((caddr_t)dewey, sizeof(dewey));
 300                 ndewey = getdewey(dewey, cp + 4);
 301                 if (ndewey < 2)
 302                         continue;
 303                 enter(dir, dp->d_name, name, dewey, ndewey);
 304         }
 305
 306         closedir(dd);
 307         return 0;
 308 }
 309
 310 static void
 311 enter(char *dir, char *file, char *name, int *dewey, int ndewey)
 312 {
 313         struct shlib_list       *shp;
 314
 315         for (shp = shlib_head; shp; shp = shp->next) {
 316                 if (strcmp(name, shp->name) != 0 || major != shp->major)
 317                         continue;
 318
 319                 /* Name matches existing entry */
 320                 if (cmpndewey(dewey, ndewey, shp->dewey, shp->ndewey) > 0) {
 321
 322                         /* Update this entry with higher versioned lib */
 323                         if (verbose)
 324                                 printf("Updating lib%s.%d.%d to %s/%s\n",
 325                                         shp->name, shp->major, shp->minor,
 326                                         dir, file);
 327
 328                         free(shp->name);
 329                         shp->name = strdup(name);
 330                         free(shp->path);
 331                         shp->path = concat(dir, "/", file);
 332                         bcopy(dewey, shp->dewey, sizeof(shp->dewey));
 333                         shp->ndewey = ndewey;
 334                 }
 335                 break;
 336         }
 337
 338         if (shp)
 339                 /* Name exists: older version or just updated */
 340                 return;
 341
 342         /* Allocate new list element */
 343         if (verbose)
 344                 printf("Adding %s/%s\n", dir, file);
 345
 346         shp = (struct shlib_list *)xmalloc(sizeof *shp);
 347         shp->name = strdup(name);
 348         shp->path = concat(dir, "/", file);
 349         bcopy(dewey, shp->dewey, MAXDEWEY);
 350         shp->ndewey = ndewey;
 351         shp->next = NULL;
 352
 353         *shlib_tail = shp;
 354         shlib_tail = &shp->next;
 355 }
 356
 357
 358 int
 359 hinthash(char *cp, int vmajor)
 360 {
 361         int     k = 0;
 362
 363         while (*cp)
 364                 k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
 365
 366         k = (((k << 1) + (k >> 14)) ^ (vmajor*257)) & 0x3fff;
 367
 368         return k;
 369 }
 370
 371 int
 372 buildhints(void)
 373 {
 374         struct hints_header     hdr;
 375         struct hints_bucket     *blist;
 376         struct shlib_list       *shp;
 377         char                    *strtab;
 378         int                     i, n, str_index = 0;
 379         int                     strtab_sz = 0;  /* Total length of strings */
 380         int                     nhints = 0;     /* Total number of hints */
 381         int                     fd;
 382         char                    *tmpfile;
 383
 384         for (shp = shlib_head; shp; shp = shp->next) {
 385                 strtab_sz += 1 + strlen(shp->name);
 386                 strtab_sz += 1 + strlen(shp->path);
 387                 nhints++;
 388         }
 389
 390         /* Fill hints file header */
 391         hdr.hh_magic = HH_MAGIC;
 392         hdr.hh_version = LD_HINTS_VERSION_2;
 393         hdr.hh_nbucket = 1 * nhints;
 394         n = hdr.hh_nbucket * sizeof(struct hints_bucket);
 395         hdr.hh_hashtab = sizeof(struct hints_header);
 396         hdr.hh_strtab = hdr.hh_hashtab + n;
 397         hdr.hh_dirlist = strtab_sz;
 398         strtab_sz += 1 + strlen(dir_list);
 399         hdr.hh_strtab_sz = strtab_sz;
 400         hdr.hh_ehints = hdr.hh_strtab + hdr.hh_strtab_sz;
 401
 402         if (verbose)
 403                 printf("Totals: entries %d, buckets %ld, string size %d\n",
 404                         nhints, (long)hdr.hh_nbucket, strtab_sz);
 405
 406         /* Allocate buckets and string table */
 407         blist = (struct hints_bucket *)xmalloc(n);
 408         bzero((char *)blist, n);
 409         for (i = 0; i < hdr.hh_nbucket; i++)
 410                 /* Empty all buckets */
 411                 blist[i].hi_next = -1;
 412
 413         strtab = (char *)xmalloc(strtab_sz);
 414
 415         /* Enter all */
 416         for (shp = shlib_head; shp; shp = shp->next) {
 417                 struct hints_bucket     *bp;
 418
 419                 bp = blist +
 420                   (hinthash(shp->name, shp->major) % hdr.hh_nbucket);
 421
 422                 if (bp->hi_pathx) {
 423                         int     i;
 424
 425                         for (i = 0; i < hdr.hh_nbucket; i++) {
 426                                 if (blist[i].hi_pathx == 0)
 427                                         break;
 428                         }
 429                         if (i == hdr.hh_nbucket) {
 430                                 warnx("bummer!");
 431                                 return -1;
 432                         }
 433                         while (bp->hi_next != -1)
 434                                 bp = &blist[bp->hi_next];
 435                         bp->hi_next = i;
 436                         bp = blist + i;
 437                 }
 438
 439                 /* Insert strings in string table */
 440                 bp->hi_namex = str_index;
 441                 strcpy(strtab + str_index, shp->name);
 442                 str_index += 1 + strlen(shp->name);
 443
 444                 bp->hi_pathx = str_index;
 445                 strcpy(strtab + str_index, shp->path);
 446                 str_index += 1 + strlen(shp->path);
 447
 448                 /* Copy versions */
 449                 bcopy(shp->dewey, bp->hi_dewey, sizeof(bp->hi_dewey));
 450                 bp->hi_ndewey = shp->ndewey;
 451         }
 452
 453         /* Copy search directories */
 454         strcpy(strtab + str_index, dir_list);
 455         str_index += 1 + strlen(dir_list);
 456
 457         /* Sanity check */
 458         if (str_index != strtab_sz) {
 459                 errx(1, "str_index(%d) != strtab_sz(%d)", str_index, strtab_sz);
 460         }
 461
 462         tmpfile = concat(hints_file, ".XXXXXXXXXX", "");
 463         umask(0);       /* Create with exact permissions */
 464         if ((fd = mkstemp(tmpfile)) == -1) {
 465                 warn("%s", tmpfile);
 466                 return -1;
 467         }
 468         fchmod(fd, 0444);
 469
 470         if (write(fd, &hdr, sizeof(struct hints_header)) !=
 471                                                 sizeof(struct hints_header)) {
 472                 warn("%s", hints_file);
 473                 return -1;
 474         }
 475         if (write(fd, blist, hdr.hh_nbucket * sizeof(struct hints_bucket)) !=
 476                                 hdr.hh_nbucket * sizeof(struct hints_bucket)) {
 477                 warn("%s", hints_file);
 478                 return -1;
 479         }
 480         if (write(fd, strtab, strtab_sz) != strtab_sz) {
 481                 warn("%s", hints_file);
 482                 return -1;
 483         }
 484         if (close(fd) != 0) {
 485                 warn("%s", hints_file);
 486                 return -1;
 487         }
 488
 489         /* Install it */
 490         if (unlink(hints_file) != 0 && errno != ENOENT) {
 491                 warn("%s", hints_file);
 492                 return -1;
 493         }
 494
 495         if (rename(tmpfile, hints_file) != 0) {
 496                 warn("%s", hints_file);
 497                 return -1;
 498         }
 499
 500         return 0;
 501 }
 502
 503 static int
 504 readhints(void)
 505 {
 506         int                     fd;
 507         void                    *addr;
 508         long                    fsize;
 509         long                    msize;
 510         struct hints_header     *hdr;
 511         struct hints_bucket     *blist;
 512         char                    *strtab;
 513         struct shlib_list       *shp;
 514         int                     i;
 515
 516         if ((fd = open(hints_file, O_RDONLY, 0)) == -1) {
 517                 warn("%s", hints_file);
 518                 return -1;
 519         }
 520
 521         msize = PAGE_SIZE;
 522         addr = mmap(0, msize, PROT_READ, MAP_COPY, fd, 0);
 523
 524         if (addr == MAP_FAILED) {
 525                 warn("%s", hints_file);
 526                 return -1;
 527         }
 528
 529         hdr = (struct hints_header *)addr;
 530         if (HH_BADMAG(*hdr)) {
 531                 warnx("%s: bad magic: %lo", hints_file,
 532                         (unsigned long)hdr->hh_magic);
 533                 return -1;
 534         }
 535
 536         if (hdr->hh_version != LD_HINTS_VERSION_1 &&
 537             hdr->hh_version != LD_HINTS_VERSION_2) {
 538                 warnx("unsupported version: %ld", (long)hdr->hh_version);
 539                 return -1;
 540         }
 541
 542         if (hdr->hh_ehints > msize) {
 543                 fsize = hdr->hh_ehints;
 544                 munmap(addr, msize);
 545                 addr = mmap(0, fsize, PROT_READ, MAP_COPY, fd, 0);
 546                 if (addr == MAP_FAILED) {
 547                         warn("%s", hints_file);
 548                         return -1;
 549                 }
 550                 hdr = (struct hints_header *)addr;
 551         }
 552         close(fd);
 553
 554         blist = (struct hints_bucket *)(addr + hdr->hh_hashtab);
 555         strtab = (char *)(addr + hdr->hh_strtab);
 556
 557         if (hdr->hh_version >= LD_HINTS_VERSION_2)
 558                 add_search_path(strtab + hdr->hh_dirlist);
 559         else if (rescan)
 560                 errx(1, "%s too old and does not contain the search path",
 561                         hints_file);
 562
 563         if (rescan)
 564                 return 0;
 565
 566         for (i = 0; i < hdr->hh_nbucket; i++) {
 567                 struct hints_bucket     *bp = &blist[i];
 568
 569                 /* Sanity check */
 570                 if (bp->hi_namex >= hdr->hh_strtab_sz) {
 571                         warnx("bad name index: %#x", bp->hi_namex);
 572                         return -1;
 573                 }
 574                 if (bp->hi_pathx >= hdr->hh_strtab_sz) {
 575                         warnx("bad path index: %#x", bp->hi_pathx);
 576                         return -1;
 577                 }
 578
 579                 /* Allocate new list element */
 580                 shp = (struct shlib_list *)xmalloc(sizeof *shp);
 581                 shp->name = strdup(strtab + bp->hi_namex);
 582                 shp->path = strdup(strtab + bp->hi_pathx);
 583                 bcopy(bp->hi_dewey, shp->dewey, sizeof(shp->dewey));
 584                 shp->ndewey = bp->hi_ndewey;
 585                 shp->next = NULL;
 586
 587                 *shlib_tail = shp;
 588                 shlib_tail = &shp->next;
 589         }
 590
 591         return 0;
 592 }
 593
 594 static void
 595 listhints(void)
 596 {
 597         struct shlib_list       *shp;
 598         int                     i;
 599
 600         printf("%s:\n", hints_file);
 601         printf("\tsearch directories: %s\n", dir_list);
 602
 603         for (i = 0, shp = shlib_head; shp; i++, shp = shp->next)
 604                 printf("\t%d:-l%s.%d.%d => %s\n",
 605                         i, shp->name, shp->major, shp->minor, shp->path);
 606
 607         return;
 608 }