1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1993,1995 Paul Kranenburg
5 * 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. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Paul Kranenburg.
18 * 4. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #ifndef lint
34 static const char rcsid[] =
35 "$FreeBSD: stable/12/sbin/ldconfig/ldconfig.c 337530 2018-08-09 11:46:12Z trasz $";
36 #endif /* not lint */
37
38 #include <sys/param.h>
39 #include <sys/types.h>
40 #include <sys/stat.h>
41 #include <sys/mman.h>
42 #include <a.out.h>
43 #include <ctype.h>
44 #include <dirent.h>
45 #include <elf-hints.h>
46 #include <err.h>
47 #include <errno.h>
48 #include <fcntl.h>
49 #include <sys/link_aout.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <unistd.h>
54
55 #include "ldconfig.h"
56 #include "shlib.h"
57 #include "support.h"
58
59 #if DEBUG
60 /* test */
61 #undef _PATH_LD_HINTS
62 #define _PATH_LD_HINTS "./ld.so.hints"
63 #undef _PATH_ELF_HINTS
64 #define _PATH_ELF_HINTS "./ld-elf.so.hints"
65 #endif
66
67 #define _PATH_LD32_HINTS "/var/run/ld32.so.hints"
68 #define _PATH_ELF32_HINTS "/var/run/ld-elf32.so.hints"
69 #define _PATH_ELFSOFT_HINTS "/var/run/ld-elf-soft.so.hints"
70
71 #undef major
72 #undef minor
73
74 static int verbose;
75 static int nostd;
76 static int justread;
77 static int merge;
78 static int rescan;
79 static const char *hints_file;
80
81 struct shlib_list {
82 /* Internal list of shared libraries found */
83 char *name;
84 char *path;
85 int dewey[MAXDEWEY];
86 int ndewey;
87 #define major dewey[0]
88 #define minor dewey[1]
89 struct shlib_list *next;
90 };
91
92 static struct shlib_list *shlib_head = NULL, **shlib_tail = &shlib_head;
93 static char *dir_list;
94
95 static int buildhints(void);
96 static int dodir(char *, int);
97 int dofile(char *, int);
98 static void enter(char *, char *, char *, int *, int);
99 static void listhints(void);
100 static int readhints(void);
101 static void usage(void);
102
103 /*
104 * Note on aout/a.out support.
105 * To properly support shared libraries for compat2x, which are a.out, we need
106 * to support a.out here. As of 2013, bug reports are still coming in for this
107 * feature (on amd64 no less), so we know it is still in use.
108 */
109
110 int
main(int argc,char ** argv)111 main(int argc, char **argv)
112 {
113 int i, c;
114 int rval = 0;
115 int is_aout = 0;
116 int is_32 = 0;
117 int is_soft = 0;
118
119 while (argc > 1) {
120 if (strcmp(argv[1], "-aout") == 0) {
121 is_aout = 1;
122 argc--;
123 argv++;
124 } else if (strcmp(argv[1], "-elf") == 0) {
125 is_aout = 0;
126 argc--;
127 argv++;
128 } else if (strcmp(argv[1], "-32") == 0) {
129 is_32 = 1;
130 argc--;
131 argv++;
132 } else if (strcmp(argv[1], "-soft") == 0) {
133 is_soft = 1;
134 argc--;
135 argv++;
136 } else {
137 break;
138 }
139 }
140
141 if (is_soft)
142 hints_file = _PATH_ELFSOFT_HINTS; /* Never will have a.out softfloat */
143 else if (is_32)
144 hints_file = is_aout ? _PATH_LD32_HINTS : _PATH_ELF32_HINTS;
145 else
146 hints_file = is_aout ? _PATH_LD_HINTS : _PATH_ELF_HINTS;
147 if (argc == 1)
148 rescan = 1;
149 else while((c = getopt(argc, argv, "Rf:imrsv")) != -1) {
150 switch (c) {
151 case 'R':
152 rescan = 1;
153 break;
154 case 'f':
155 hints_file = optarg;
156 break;
157 case 'i':
158 insecure = 1;
159 break;
160 case 'm':
161 merge = 1;
162 break;
163 case 'r':
164 justread = 1;
165 break;
166 case 's':
167 nostd = 1;
168 break;
169 case 'v':
170 verbose = 1;
171 break;
172 default:
173 usage();
174 break;
175 }
176 }
177
178 if (!is_aout) {
179 if (justread)
180 list_elf_hints(hints_file);
181 else
182 update_elf_hints(hints_file, argc - optind,
183 argv + optind, merge || rescan);
184 return 0;
185 }
186
187 /* Here begins the aout libs processing */
188 dir_list = strdup("");
189
190 if (justread || merge || rescan) {
191 if ((rval = readhints()) != 0)
192 return rval;
193 }
194
195 if (!nostd && !merge && !rescan)
196 std_search_path();
197
198 /* Add any directories/files from the command line */
199 if (!justread) {
200 for (i = optind; i < argc; i++) {
201 struct stat stbuf;
202
203 if (stat(argv[i], &stbuf) == -1) {
204 warn("%s", argv[i]);
205 rval = -1;
206 } else if (strcmp(argv[i], "/usr/lib") == 0) {
207 warnx("WARNING! '%s' can not be used", argv[i]);
208 rval = -1;
209 } else {
210 /*
211 * See if this is a directory-containing
212 * file instead of a directory
213 */
214 if (S_ISREG(stbuf.st_mode))
215 rval |= dofile(argv[i], 0);
216 else
217 add_search_path(argv[i]);
218 }
219 }
220 }
221
222 for (i = 0; i < n_search_dirs; i++) {
223 char *cp = concat(dir_list, *dir_list?":":"", search_dirs[i]);
224 free(dir_list);
225 dir_list = cp;
226 }
227
228 if (justread) {
229 listhints();
230 return 0;
231 }
232
233 for (i = 0; i < n_search_dirs; i++)
234 rval |= dodir(search_dirs[i], 1);
235
236 rval |= buildhints();
237
238 return rval;
239 }
240
241 static void
usage(void)242 usage(void)
243 {
244 fprintf(stderr,
245 "usage: ldconfig [-32] [-aout | -elf] [-Rimrsv] [-f hints_file] [directory | file ...]\n");
246 exit(1);
247 }
248
249 int
dofile(char * fname,int silent)250 dofile(char *fname, int silent)
251 {
252 FILE *hfp;
253 char buf[MAXPATHLEN];
254 int rval = 0;
255 char *cp, *sp;
256
257 if ((hfp = fopen(fname, "r")) == NULL) {
258 warn("%s", fname);
259 return -1;
260 }
261
262 while (fgets(buf, sizeof(buf), hfp)) {
263 cp = buf;
264 while (isspace(*cp))
265 cp++;
266 if (*cp == '#' || *cp == '\0')
267 continue;
268 sp = cp;
269 while (!isspace(*cp) && *cp != '\0')
270 cp++;
271
272 if (*cp != '\n') {
273 *cp = '\0';
274 warnx("%s: trailing characters ignored", sp);
275 }
276
277 *cp = '\0';
278
279 rval |= dodir(sp, silent);
280 }
281
282 (void)fclose(hfp);
283 return rval;
284 }
285
286 int
dodir(char * dir,int silent)287 dodir(char *dir, int silent)
288 {
289 DIR *dd;
290 struct dirent *dp;
291 char name[MAXPATHLEN];
292 int dewey[MAXDEWEY], ndewey;
293
294 if ((dd = opendir(dir)) == NULL) {
295 if (silent && errno == ENOENT) /* Ignore the error */
296 return 0;
297 warn("%s", dir);
298 return -1;
299 }
300
301 while ((dp = readdir(dd)) != NULL) {
302 int n;
303 char *cp;
304
305 /* Check for `lib' prefix */
306 if (dp->d_name[0] != 'l' ||
307 dp->d_name[1] != 'i' ||
308 dp->d_name[2] != 'b')
309 continue;
310
311 /* Copy the entry minus prefix */
312 (void)strcpy(name, dp->d_name + 3);
313 n = strlen(name);
314 if (n < 4)
315 continue;
316
317 /* Find ".so." in name */
318 for (cp = name + n - 4; cp > name; --cp) {
319 if (cp[0] == '.' &&
320 cp[1] == 's' &&
321 cp[2] == 'o' &&
322 cp[3] == '.')
323 break;
324 }
325 if (cp <= name)
326 continue;
327
328 *cp = '\0';
329 if (!isdigit(*(cp+4)))
330 continue;
331
332 bzero((caddr_t)dewey, sizeof(dewey));
333 ndewey = getdewey(dewey, cp + 4);
334 if (ndewey < 2)
335 continue;
336 enter(dir, dp->d_name, name, dewey, ndewey);
337 }
338
339 closedir(dd);
340 return 0;
341 }
342
343 static void
enter(char * dir,char * file,char * name,int dewey[],int ndewey)344 enter(char *dir, char *file, char *name, int dewey[], int ndewey)
345 {
346 struct shlib_list *shp;
347
348 for (shp = shlib_head; shp; shp = shp->next) {
349 if (strcmp(name, shp->name) != 0 || major != shp->major)
350 continue;
351
352 /* Name matches existing entry */
353 if (cmpndewey(dewey, ndewey, shp->dewey, shp->ndewey) > 0) {
354
355 /* Update this entry with higher versioned lib */
356 if (verbose)
357 printf("Updating lib%s.%d.%d to %s/%s\n",
358 shp->name, shp->major, shp->minor,
359 dir, file);
360
361 free(shp->name);
362 shp->name = strdup(name);
363 free(shp->path);
364 shp->path = concat(dir, "/", file);
365 bcopy(dewey, shp->dewey, sizeof(shp->dewey));
366 shp->ndewey = ndewey;
367 }
368 break;
369 }
370
371 if (shp)
372 /* Name exists: older version or just updated */
373 return;
374
375 /* Allocate new list element */
376 if (verbose)
377 printf("Adding %s/%s\n", dir, file);
378
379 shp = (struct shlib_list *)xmalloc(sizeof *shp);
380 shp->name = strdup(name);
381 shp->path = concat(dir, "/", file);
382 bcopy(dewey, shp->dewey, sizeof(shp->dewey));
383 shp->ndewey = ndewey;
384 shp->next = NULL;
385
386 *shlib_tail = shp;
387 shlib_tail = &shp->next;
388 }
389
390
391 static int
hinthash(char * cp,int vmajor)392 hinthash(char *cp, int vmajor)
393 {
394 int k = 0;
395
396 while (*cp)
397 k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
398
399 k = (((k << 1) + (k >> 14)) ^ (vmajor*257)) & 0x3fff;
400
401 return k;
402 }
403
404 int
buildhints(void)405 buildhints(void)
406 {
407 struct hints_header hdr;
408 struct hints_bucket *blist;
409 struct shlib_list *shp;
410 char *strtab;
411 int i, n, str_index = 0;
412 int strtab_sz = 0; /* Total length of strings */
413 int nhints = 0; /* Total number of hints */
414 int fd;
415 char *tmpfilename;
416
417 for (shp = shlib_head; shp; shp = shp->next) {
418 strtab_sz += 1 + strlen(shp->name);
419 strtab_sz += 1 + strlen(shp->path);
420 nhints++;
421 }
422
423 /* Fill hints file header */
424 hdr.hh_magic = HH_MAGIC;
425 hdr.hh_version = LD_HINTS_VERSION_2;
426 hdr.hh_nbucket = 1 * nhints;
427 n = hdr.hh_nbucket * sizeof(struct hints_bucket);
428 hdr.hh_hashtab = sizeof(struct hints_header);
429 hdr.hh_strtab = hdr.hh_hashtab + n;
430 hdr.hh_dirlist = strtab_sz;
431 strtab_sz += 1 + strlen(dir_list);
432 hdr.hh_strtab_sz = strtab_sz;
433 hdr.hh_ehints = hdr.hh_strtab + hdr.hh_strtab_sz;
434
435 if (verbose)
436 printf("Totals: entries %d, buckets %ld, string size %d\n",
437 nhints, (long)hdr.hh_nbucket, strtab_sz);
438
439 /* Allocate buckets and string table */
440 blist = (struct hints_bucket *)xmalloc(n);
441 bzero((char *)blist, n);
442 for (i = 0; i < hdr.hh_nbucket; i++)
443 /* Empty all buckets */
444 blist[i].hi_next = -1;
445
446 strtab = (char *)xmalloc(strtab_sz);
447
448 /* Enter all */
449 for (shp = shlib_head; shp; shp = shp->next) {
450 struct hints_bucket *bp;
451
452 bp = blist +
453 (hinthash(shp->name, shp->major) % hdr.hh_nbucket);
454
455 if (bp->hi_pathx) {
456 int j;
457
458 for (j = 0; j < hdr.hh_nbucket; j++) {
459 if (blist[j].hi_pathx == 0)
460 break;
461 }
462 if (j == hdr.hh_nbucket) {
463 warnx("bummer!");
464 return -1;
465 }
466 while (bp->hi_next != -1)
467 bp = &blist[bp->hi_next];
468 bp->hi_next = j;
469 bp = blist + j;
470 }
471
472 /* Insert strings in string table */
473 bp->hi_namex = str_index;
474 strcpy(strtab + str_index, shp->name);
475 str_index += 1 + strlen(shp->name);
476
477 bp->hi_pathx = str_index;
478 strcpy(strtab + str_index, shp->path);
479 str_index += 1 + strlen(shp->path);
480
481 /* Copy versions */
482 bcopy(shp->dewey, bp->hi_dewey, sizeof(bp->hi_dewey));
483 bp->hi_ndewey = shp->ndewey;
484 }
485
486 /* Copy search directories */
487 strcpy(strtab + str_index, dir_list);
488 str_index += 1 + strlen(dir_list);
489
490 /* Sanity check */
491 if (str_index != strtab_sz) {
492 errx(1, "str_index(%d) != strtab_sz(%d)", str_index, strtab_sz);
493 }
494
495 tmpfilename = concat(hints_file, ".XXXXXXXXXX", "");
496 umask(0); /* Create with exact permissions */
497 if ((fd = mkstemp(tmpfilename)) == -1) {
498 warn("%s", tmpfilename);
499 return -1;
500 }
501 fchmod(fd, 0444);
502
503 if (write(fd, &hdr, sizeof(struct hints_header)) !=
504 sizeof(struct hints_header)) {
505 warn("%s", hints_file);
506 return -1;
507 }
508 if (write(fd, blist, hdr.hh_nbucket * sizeof(*blist)) !=
509 (ssize_t)(hdr.hh_nbucket * sizeof(*blist))) {
510 warn("%s", hints_file);
511 return -1;
512 }
513 if (write(fd, strtab, strtab_sz) != strtab_sz) {
514 warn("%s", hints_file);
515 return -1;
516 }
517 if (close(fd) != 0) {
518 warn("%s", hints_file);
519 return -1;
520 }
521 if (rename(tmpfilename, hints_file) != 0) {
522 warn("%s", hints_file);
523 return -1;
524 }
525
526 return 0;
527 }
528
529 static int
readhints(void)530 readhints(void)
531 {
532 int fd;
533 void *addr;
534 long fsize;
535 long msize;
536 struct hints_header *hdr;
537 struct hints_bucket *blist;
538 char *strtab;
539 struct shlib_list *shp;
540 int i;
541
542 if ((fd = open(hints_file, O_RDONLY, 0)) == -1) {
543 warn("%s", hints_file);
544 return -1;
545 }
546
547 msize = PAGE_SIZE;
548 addr = mmap(0, msize, PROT_READ, MAP_PRIVATE, fd, 0);
549
550 if (addr == MAP_FAILED) {
551 warn("%s", hints_file);
552 return -1;
553 }
554
555 hdr = (struct hints_header *)addr;
556 if (HH_BADMAG(*hdr)) {
557 warnx("%s: bad magic: %lo", hints_file,
558 (unsigned long)hdr->hh_magic);
559 return -1;
560 }
561
562 if (hdr->hh_version != LD_HINTS_VERSION_1 &&
563 hdr->hh_version != LD_HINTS_VERSION_2) {
564 warnx("unsupported version: %ld", (long)hdr->hh_version);
565 return -1;
566 }
567
568 if (hdr->hh_ehints > msize) {
569 fsize = hdr->hh_ehints;
570 munmap(addr, msize);
571 addr = mmap(0, fsize, PROT_READ, MAP_PRIVATE, fd, 0);
572 if (addr == MAP_FAILED) {
573 warn("%s", hints_file);
574 return -1;
575 }
576 hdr = (struct hints_header *)addr;
577 }
578 close(fd);
579
580 strtab = (char *)addr + hdr->hh_strtab;
581
582 if (hdr->hh_version >= LD_HINTS_VERSION_2)
583 add_search_path(strtab + hdr->hh_dirlist);
584 else if (rescan)
585 errx(1, "%s too old and does not contain the search path",
586 hints_file);
587
588 if (rescan)
589 return 0;
590
591 blist = malloc(sizeof(*blist) * hdr->hh_nbucket);
592 if (blist == NULL)
593 err(1, "readhints");
594 memcpy(blist, (char *)addr + hdr->hh_hashtab,
595 sizeof(*blist) * hdr->hh_nbucket);
596
597
598 for (i = 0; i < hdr->hh_nbucket; i++) {
599 struct hints_bucket *bp = &blist[i];
600
601 /* Sanity check */
602 if (bp->hi_namex >= hdr->hh_strtab_sz) {
603 warnx("bad name index: %#x", bp->hi_namex);
604 free(blist);
605 return -1;
606 }
607 if (bp->hi_pathx >= hdr->hh_strtab_sz) {
608 warnx("bad path index: %#x", bp->hi_pathx);
609 free(blist);
610 return -1;
611 }
612
613 /* Allocate new list element */
614 shp = (struct shlib_list *)xmalloc(sizeof *shp);
615 shp->name = strdup(strtab + bp->hi_namex);
616 shp->path = strdup(strtab + bp->hi_pathx);
617 bcopy(bp->hi_dewey, shp->dewey, sizeof(shp->dewey));
618 shp->ndewey = bp->hi_ndewey;
619 shp->next = NULL;
620
621 *shlib_tail = shp;
622 shlib_tail = &shp->next;
623 }
624
625 free(blist);
626 return 0;
627 }
628
629 static void
listhints(void)630 listhints(void)
631 {
632 struct shlib_list *shp;
633 int i;
634
635 printf("%s:\n", hints_file);
636 printf("\tsearch directories: %s\n", dir_list);
637
638 for (i = 0, shp = shlib_head; shp; i++, shp = shp->next)
639 printf("\t%d:-l%s.%d.%d => %s\n",
640 i, shp->name, shp->major, shp->minor, shp->path);
641
642 return;
643 }
644