1 | /* Copyright (C) 1999-2017 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | Contributed by Andreas Jaeger <aj@suse.de>, 1999. |
4 | |
5 | This program is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published |
7 | by the Free Software Foundation; version 2 of the License, or |
8 | (at your option) any later version. |
9 | |
10 | This program is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU General Public License |
16 | along with this program; if not, see <http://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <error.h> |
20 | #include <dirent.h> |
21 | #include <inttypes.h> |
22 | #include <libgen.h> |
23 | #include <libintl.h> |
24 | #include <stdio.h> |
25 | #include <stdlib.h> |
26 | #include <string.h> |
27 | #include <unistd.h> |
28 | #include <stdint.h> |
29 | #include <sys/fcntl.h> |
30 | #include <sys/mman.h> |
31 | #include <sys/stat.h> |
32 | #include <sys/types.h> |
33 | |
34 | #include <ldconfig.h> |
35 | #include <dl-cache.h> |
36 | |
37 | struct cache_entry |
38 | { |
39 | char *lib; /* Library name. */ |
40 | char *path; /* Path to find library. */ |
41 | int flags; /* Flags to indicate kind of library. */ |
42 | unsigned int osversion; /* Required OS version. */ |
43 | uint64_t hwcap; /* Important hardware capabilities. */ |
44 | int bits_hwcap; /* Number of bits set in hwcap. */ |
45 | struct cache_entry *next; /* Next entry in list. */ |
46 | }; |
47 | |
48 | /* List of all cache entries. */ |
49 | static struct cache_entry *entries; |
50 | |
51 | static const char *flag_descr[] = |
52 | { "libc4" , "ELF" , "libc5" , "libc6" }; |
53 | |
54 | /* Print a single entry. */ |
55 | static void |
56 | print_entry (const char *lib, int flag, unsigned int osversion, |
57 | uint64_t hwcap, const char *key) |
58 | { |
59 | printf ("\t%s (" , lib); |
60 | switch (flag & FLAG_TYPE_MASK) |
61 | { |
62 | case FLAG_LIBC4: |
63 | case FLAG_ELF: |
64 | case FLAG_ELF_LIBC5: |
65 | case FLAG_ELF_LIBC6: |
66 | fputs (flag_descr[flag & FLAG_TYPE_MASK], stdout); |
67 | break; |
68 | default: |
69 | fputs (_("unknown" ), stdout); |
70 | break; |
71 | } |
72 | switch (flag & FLAG_REQUIRED_MASK) |
73 | { |
74 | case FLAG_SPARC_LIB64: |
75 | fputs (",64bit" , stdout); |
76 | break; |
77 | case FLAG_IA64_LIB64: |
78 | fputs (",IA-64" , stdout); |
79 | break; |
80 | case FLAG_X8664_LIB64: |
81 | fputs (",x86-64" , stdout); |
82 | break; |
83 | case FLAG_S390_LIB64: |
84 | fputs (",64bit" , stdout); |
85 | break; |
86 | case FLAG_POWERPC_LIB64: |
87 | fputs (",64bit" , stdout); |
88 | break; |
89 | case FLAG_MIPS64_LIBN32: |
90 | fputs (",N32" , stdout); |
91 | break; |
92 | case FLAG_MIPS64_LIBN64: |
93 | fputs (",64bit" , stdout); |
94 | break; |
95 | case FLAG_X8664_LIBX32: |
96 | fputs (",x32" , stdout); |
97 | break; |
98 | case FLAG_ARM_LIBHF: |
99 | fputs (",hard-float" , stdout); |
100 | break; |
101 | case FLAG_AARCH64_LIB64: |
102 | fputs (",AArch64" , stdout); |
103 | break; |
104 | /* Uses the ARM soft-float ABI. */ |
105 | case FLAG_ARM_LIBSF: |
106 | fputs (",soft-float" , stdout); |
107 | break; |
108 | case FLAG_MIPS_LIB32_NAN2008: |
109 | fputs (",nan2008" , stdout); |
110 | break; |
111 | case FLAG_MIPS64_LIBN32_NAN2008: |
112 | fputs (",N32,nan2008" , stdout); |
113 | break; |
114 | case FLAG_MIPS64_LIBN64_NAN2008: |
115 | fputs (",64bit,nan2008" , stdout); |
116 | break; |
117 | case 0: |
118 | break; |
119 | default: |
120 | printf (",%d" , flag & FLAG_REQUIRED_MASK); |
121 | break; |
122 | } |
123 | if (hwcap != 0) |
124 | printf (", hwcap: %#.16" PRIx64, hwcap); |
125 | if (osversion != 0) |
126 | { |
127 | static const char *const abi_tag_os[] = |
128 | { |
129 | [0] = "Linux" , |
130 | [1] = "Hurd" , |
131 | [2] = "Solaris" , |
132 | [3] = "FreeBSD" , |
133 | [4] = "kNetBSD" , |
134 | [5] = "Syllable" , |
135 | [6] = N_("Unknown OS" ) |
136 | }; |
137 | #define MAXTAG (sizeof abi_tag_os / sizeof abi_tag_os[0] - 1) |
138 | unsigned int os = osversion >> 24; |
139 | |
140 | printf (_(", OS ABI: %s %d.%d.%d" ), |
141 | _(abi_tag_os[os > MAXTAG ? MAXTAG : os]), |
142 | (osversion >> 16) & 0xff, |
143 | (osversion >> 8) & 0xff, |
144 | osversion & 0xff); |
145 | } |
146 | printf (") => %s\n" , key); |
147 | } |
148 | |
149 | |
150 | /* Print the whole cache file, if a file contains the new cache format |
151 | hidden in the old one, print the contents of the new format. */ |
152 | void |
153 | print_cache (const char *cache_name) |
154 | { |
155 | int fd = open (cache_name, O_RDONLY); |
156 | if (fd < 0) |
157 | error (EXIT_FAILURE, errno, _("Can't open cache file %s\n" ), cache_name); |
158 | |
159 | struct stat64 st; |
160 | if (fstat64 (fd, &st) < 0 |
161 | /* No need to map the file if it is empty. */ |
162 | || st.st_size == 0) |
163 | { |
164 | close (fd); |
165 | return; |
166 | } |
167 | |
168 | struct cache_file *cache |
169 | = mmap (NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
170 | if (cache == MAP_FAILED) |
171 | error (EXIT_FAILURE, errno, _("mmap of cache file failed.\n" )); |
172 | |
173 | size_t cache_size = st.st_size; |
174 | if (cache_size < sizeof (struct cache_file)) |
175 | error (EXIT_FAILURE, 0, _("File is not a cache file.\n" )); |
176 | |
177 | struct cache_file_new *cache_new = NULL; |
178 | const char *cache_data; |
179 | int format = 0; |
180 | |
181 | if (memcmp (cache->magic, CACHEMAGIC, sizeof CACHEMAGIC - 1)) |
182 | { |
183 | /* This can only be the new format without the old one. */ |
184 | cache_new = (struct cache_file_new *) cache; |
185 | |
186 | if (memcmp (cache_new->magic, CACHEMAGIC_NEW, sizeof CACHEMAGIC_NEW - 1) |
187 | || memcmp (cache_new->version, CACHE_VERSION, |
188 | sizeof CACHE_VERSION - 1)) |
189 | error (EXIT_FAILURE, 0, _("File is not a cache file.\n" )); |
190 | format = 1; |
191 | /* This is where the strings start. */ |
192 | cache_data = (const char *) cache_new; |
193 | } |
194 | else |
195 | { |
196 | size_t offset = ALIGN_CACHE (sizeof (struct cache_file) |
197 | + (cache->nlibs |
198 | * sizeof (struct file_entry))); |
199 | /* This is where the strings start. */ |
200 | cache_data = (const char *) &cache->libs[cache->nlibs]; |
201 | |
202 | /* Check for a new cache embedded in the old format. */ |
203 | if (cache_size > |
204 | (offset + sizeof (struct cache_file_new))) |
205 | { |
206 | |
207 | cache_new = (struct cache_file_new *) ((void *)cache + offset); |
208 | |
209 | if (memcmp (cache_new->magic, CACHEMAGIC_NEW, |
210 | sizeof CACHEMAGIC_NEW - 1) == 0 |
211 | && memcmp (cache_new->version, CACHE_VERSION, |
212 | sizeof CACHE_VERSION - 1) == 0) |
213 | { |
214 | cache_data = (const char *) cache_new; |
215 | format = 1; |
216 | } |
217 | } |
218 | } |
219 | |
220 | if (format == 0) |
221 | { |
222 | printf (_("%d libs found in cache `%s'\n" ), cache->nlibs, cache_name); |
223 | |
224 | /* Print everything. */ |
225 | for (unsigned int i = 0; i < cache->nlibs; i++) |
226 | print_entry (cache_data + cache->libs[i].key, |
227 | cache->libs[i].flags, 0, 0, |
228 | cache_data + cache->libs[i].value); |
229 | } |
230 | else if (format == 1) |
231 | { |
232 | printf (_("%d libs found in cache `%s'\n" ), |
233 | cache_new->nlibs, cache_name); |
234 | |
235 | /* Print everything. */ |
236 | for (unsigned int i = 0; i < cache_new->nlibs; i++) |
237 | print_entry (cache_data + cache_new->libs[i].key, |
238 | cache_new->libs[i].flags, |
239 | cache_new->libs[i].osversion, |
240 | cache_new->libs[i].hwcap, |
241 | cache_data + cache_new->libs[i].value); |
242 | } |
243 | /* Cleanup. */ |
244 | munmap (cache, cache_size); |
245 | close (fd); |
246 | } |
247 | |
248 | /* Initialize cache data structures. */ |
249 | void |
250 | init_cache (void) |
251 | { |
252 | entries = NULL; |
253 | } |
254 | |
255 | static int |
256 | compare (const struct cache_entry *e1, const struct cache_entry *e2) |
257 | { |
258 | /* We need to swap entries here to get the correct sort order. */ |
259 | int res = _dl_cache_libcmp (e2->lib, e1->lib); |
260 | if (res == 0) |
261 | { |
262 | if (e1->flags < e2->flags) |
263 | return 1; |
264 | else if (e1->flags > e2->flags) |
265 | return -1; |
266 | /* Sort by most specific hwcap. */ |
267 | else if (e2->bits_hwcap > e1->bits_hwcap) |
268 | return 1; |
269 | else if (e2->bits_hwcap < e1->bits_hwcap) |
270 | return -1; |
271 | else if (e2->hwcap > e1->hwcap) |
272 | return 1; |
273 | else if (e2->hwcap < e1->hwcap) |
274 | return -1; |
275 | if (e2->osversion > e1->osversion) |
276 | return 1; |
277 | if (e2->osversion < e1->osversion) |
278 | return -1; |
279 | } |
280 | return res; |
281 | } |
282 | |
283 | /* Save the contents of the cache. */ |
284 | void |
285 | save_cache (const char *cache_name) |
286 | { |
287 | /* The cache entries are sorted already, save them in this order. */ |
288 | |
289 | /* Count the length of all strings. */ |
290 | /* The old format doesn't contain hwcap entries and doesn't contain |
291 | libraries in subdirectories with hwcaps entries. Count therefore |
292 | also all entries with hwcap == 0. */ |
293 | size_t total_strlen = 0; |
294 | struct cache_entry *entry; |
295 | /* Number of cache entries. */ |
296 | int cache_entry_count = 0; |
297 | /* Number of normal cache entries. */ |
298 | int cache_entry_old_count = 0; |
299 | |
300 | for (entry = entries; entry != NULL; entry = entry->next) |
301 | { |
302 | /* Account the final NULs. */ |
303 | total_strlen += strlen (entry->lib) + strlen (entry->path) + 2; |
304 | ++cache_entry_count; |
305 | if (entry->hwcap == 0) |
306 | ++cache_entry_old_count; |
307 | } |
308 | |
309 | /* Create the on disk cache structure. */ |
310 | struct cache_file *file_entries = NULL; |
311 | size_t file_entries_size = 0; |
312 | |
313 | if (opt_format != 2) |
314 | { |
315 | /* struct cache_file_new is 64-bit aligned on some arches while |
316 | only 32-bit aligned on other arches. Duplicate last old |
317 | cache entry so that new cache in ld.so.cache can be used by |
318 | both. */ |
319 | if (opt_format != 0) |
320 | cache_entry_old_count = (cache_entry_old_count + 1) & ~1; |
321 | |
322 | /* And the list of all entries in the old format. */ |
323 | file_entries_size = sizeof (struct cache_file) |
324 | + cache_entry_old_count * sizeof (struct file_entry); |
325 | file_entries = xmalloc (file_entries_size); |
326 | |
327 | /* Fill in the header. */ |
328 | memset (file_entries, '\0', sizeof (struct cache_file)); |
329 | memcpy (file_entries->magic, CACHEMAGIC, sizeof CACHEMAGIC - 1); |
330 | |
331 | file_entries->nlibs = cache_entry_old_count; |
332 | } |
333 | |
334 | struct cache_file_new *file_entries_new = NULL; |
335 | size_t file_entries_new_size = 0; |
336 | |
337 | if (opt_format != 0) |
338 | { |
339 | /* And the list of all entries in the new format. */ |
340 | file_entries_new_size = sizeof (struct cache_file_new) |
341 | + cache_entry_count * sizeof (struct file_entry_new); |
342 | file_entries_new = xmalloc (file_entries_new_size); |
343 | |
344 | /* Fill in the header. */ |
345 | memset (file_entries_new, '\0', sizeof (struct cache_file_new)); |
346 | memcpy (file_entries_new->magic, CACHEMAGIC_NEW, |
347 | sizeof CACHEMAGIC_NEW - 1); |
348 | memcpy (file_entries_new->version, CACHE_VERSION, |
349 | sizeof CACHE_VERSION - 1); |
350 | |
351 | file_entries_new->nlibs = cache_entry_count; |
352 | file_entries_new->len_strings = total_strlen; |
353 | } |
354 | |
355 | /* Pad for alignment of cache_file_new. */ |
356 | size_t pad = ALIGN_CACHE (file_entries_size) - file_entries_size; |
357 | |
358 | /* If we have both formats, we hide the new format in the strings |
359 | table, we have to adjust all string indices for this so that |
360 | old libc5/glibc 2 dynamic linkers just ignore them. */ |
361 | unsigned int str_offset; |
362 | if (opt_format != 0) |
363 | str_offset = file_entries_new_size; |
364 | else |
365 | str_offset = 0; |
366 | |
367 | /* An array for all strings. */ |
368 | char *strings = xmalloc (total_strlen); |
369 | char *str = strings; |
370 | int idx_old; |
371 | int idx_new; |
372 | |
373 | for (idx_old = 0, idx_new = 0, entry = entries; entry != NULL; |
374 | entry = entry->next, ++idx_new) |
375 | { |
376 | /* First the library. */ |
377 | if (opt_format != 2 && entry->hwcap == 0) |
378 | { |
379 | file_entries->libs[idx_old].flags = entry->flags; |
380 | /* XXX: Actually we can optimize here and remove duplicates. */ |
381 | file_entries->libs[idx_old].key = str_offset + pad; |
382 | } |
383 | if (opt_format != 0) |
384 | { |
385 | /* We could subtract file_entries_new_size from str_offset - |
386 | not doing so makes the code easier, the string table |
387 | always begins at the beginning of the new cache |
388 | struct. */ |
389 | file_entries_new->libs[idx_new].flags = entry->flags; |
390 | file_entries_new->libs[idx_new].osversion = entry->osversion; |
391 | file_entries_new->libs[idx_new].hwcap = entry->hwcap; |
392 | file_entries_new->libs[idx_new].key = str_offset; |
393 | } |
394 | |
395 | size_t len = strlen (entry->lib) + 1; |
396 | str = mempcpy (str, entry->lib, len); |
397 | str_offset += len; |
398 | /* Then the path. */ |
399 | if (opt_format != 2 && entry->hwcap == 0) |
400 | file_entries->libs[idx_old].value = str_offset + pad; |
401 | if (opt_format != 0) |
402 | file_entries_new->libs[idx_new].value = str_offset; |
403 | len = strlen (entry->path) + 1; |
404 | str = mempcpy (str, entry->path, len); |
405 | str_offset += len; |
406 | /* Ignore entries with hwcap for old format. */ |
407 | if (entry->hwcap == 0) |
408 | ++idx_old; |
409 | } |
410 | |
411 | /* Duplicate last old cache entry if needed. */ |
412 | if (opt_format != 2 |
413 | && idx_old < cache_entry_old_count) |
414 | file_entries->libs[idx_old] = file_entries->libs[idx_old - 1]; |
415 | |
416 | /* Write out the cache. */ |
417 | |
418 | /* Write cache first to a temporary file and rename it later. */ |
419 | char *temp_name = xmalloc (strlen (cache_name) + 2); |
420 | sprintf (temp_name, "%s~" , cache_name); |
421 | |
422 | /* Create file. */ |
423 | int fd = open (temp_name, O_CREAT|O_WRONLY|O_TRUNC|O_NOFOLLOW, |
424 | S_IRUSR|S_IWUSR); |
425 | if (fd < 0) |
426 | error (EXIT_FAILURE, errno, _("Can't create temporary cache file %s" ), |
427 | temp_name); |
428 | |
429 | /* Write contents. */ |
430 | if (opt_format != 2) |
431 | { |
432 | if (write (fd, file_entries, file_entries_size) |
433 | != (ssize_t) file_entries_size) |
434 | error (EXIT_FAILURE, errno, _("Writing of cache data failed" )); |
435 | } |
436 | if (opt_format != 0) |
437 | { |
438 | /* Align cache. */ |
439 | if (opt_format != 2) |
440 | { |
441 | char zero[pad]; |
442 | memset (zero, '\0', pad); |
443 | if (write (fd, zero, pad) != (ssize_t) pad) |
444 | error (EXIT_FAILURE, errno, _("Writing of cache data failed" )); |
445 | } |
446 | if (write (fd, file_entries_new, file_entries_new_size) |
447 | != (ssize_t) file_entries_new_size) |
448 | error (EXIT_FAILURE, errno, _("Writing of cache data failed" )); |
449 | } |
450 | |
451 | if (write (fd, strings, total_strlen) != (ssize_t) total_strlen |
452 | || close (fd)) |
453 | error (EXIT_FAILURE, errno, _("Writing of cache data failed" )); |
454 | |
455 | /* Make sure user can always read cache file */ |
456 | if (chmod (temp_name, S_IROTH|S_IRGRP|S_IRUSR|S_IWUSR)) |
457 | error (EXIT_FAILURE, errno, |
458 | _("Changing access rights of %s to %#o failed" ), temp_name, |
459 | S_IROTH|S_IRGRP|S_IRUSR|S_IWUSR); |
460 | |
461 | /* Move temporary to its final location. */ |
462 | if (rename (temp_name, cache_name)) |
463 | error (EXIT_FAILURE, errno, _("Renaming of %s to %s failed" ), temp_name, |
464 | cache_name); |
465 | |
466 | /* Free all allocated memory. */ |
467 | free (file_entries_new); |
468 | free (file_entries); |
469 | free (strings); |
470 | |
471 | while (entries) |
472 | { |
473 | entry = entries; |
474 | entries = entries->next; |
475 | free (entry); |
476 | } |
477 | } |
478 | |
479 | |
480 | /* Add one library to the cache. */ |
481 | void |
482 | add_to_cache (const char *path, const char *lib, int flags, |
483 | unsigned int osversion, uint64_t hwcap) |
484 | { |
485 | size_t liblen = strlen (lib) + 1; |
486 | size_t len = liblen + strlen (path) + 1; |
487 | struct cache_entry *new_entry |
488 | = xmalloc (sizeof (struct cache_entry) + liblen + len); |
489 | |
490 | new_entry->lib = memcpy ((char *) (new_entry + 1), lib, liblen); |
491 | new_entry->path = new_entry->lib + liblen; |
492 | snprintf (new_entry->path, len, "%s/%s" , path, lib); |
493 | new_entry->flags = flags; |
494 | new_entry->osversion = osversion; |
495 | new_entry->hwcap = hwcap; |
496 | new_entry->bits_hwcap = 0; |
497 | |
498 | /* Count the number of bits set in the masked value. */ |
499 | for (size_t i = 0; |
500 | (~((1ULL << i) - 1) & hwcap) != 0 && i < 8 * sizeof (hwcap); ++i) |
501 | if ((hwcap & (1ULL << i)) != 0) |
502 | ++new_entry->bits_hwcap; |
503 | |
504 | |
505 | /* Keep the list sorted - search for right place to insert. */ |
506 | struct cache_entry *ptr = entries; |
507 | struct cache_entry *prev = entries; |
508 | while (ptr != NULL) |
509 | { |
510 | if (compare (ptr, new_entry) > 0) |
511 | break; |
512 | prev = ptr; |
513 | ptr = ptr->next; |
514 | } |
515 | /* Is this the first entry? */ |
516 | if (ptr == entries) |
517 | { |
518 | new_entry->next = entries; |
519 | entries = new_entry; |
520 | } |
521 | else |
522 | { |
523 | new_entry->next = prev->next; |
524 | prev->next = new_entry; |
525 | } |
526 | } |
527 | |
528 | |
529 | /* Auxiliary cache. */ |
530 | |
531 | struct aux_cache_entry_id |
532 | { |
533 | uint64_t ino; |
534 | uint64_t ctime; |
535 | uint64_t size; |
536 | uint64_t dev; |
537 | }; |
538 | |
539 | struct aux_cache_entry |
540 | { |
541 | struct aux_cache_entry_id id; |
542 | int flags; |
543 | unsigned int osversion; |
544 | int used; |
545 | char *soname; |
546 | struct aux_cache_entry *next; |
547 | }; |
548 | |
549 | #define AUX_CACHEMAGIC "glibc-ld.so.auxcache-1.0" |
550 | |
551 | struct aux_cache_file_entry |
552 | { |
553 | struct aux_cache_entry_id id; /* Unique id of entry. */ |
554 | int32_t flags; /* This is 1 for an ELF library. */ |
555 | uint32_t soname; /* String table indice. */ |
556 | uint32_t osversion; /* Required OS version. */ |
557 | int32_t pad; |
558 | }; |
559 | |
560 | /* ldconfig maintains an auxiliary cache file that allows |
561 | only reading those libraries that have changed since the last iteration. |
562 | For this for each library some information is cached in the auxiliary |
563 | cache. */ |
564 | struct aux_cache_file |
565 | { |
566 | char magic[sizeof AUX_CACHEMAGIC - 1]; |
567 | uint32_t nlibs; /* Number of entries. */ |
568 | uint32_t len_strings; /* Size of string table. */ |
569 | struct aux_cache_file_entry libs[0]; /* Entries describing libraries. */ |
570 | /* After this the string table of size len_strings is found. */ |
571 | }; |
572 | |
573 | static const unsigned int primes[] = |
574 | { |
575 | 1021, 2039, 4093, 8191, 16381, 32749, 65521, 131071, 262139, |
576 | 524287, 1048573, 2097143, 4194301, 8388593, 16777213, 33554393, |
577 | 67108859, 134217689, 268435399, 536870909, 1073741789, 2147483647 |
578 | }; |
579 | |
580 | static size_t aux_hash_size; |
581 | static struct aux_cache_entry **aux_hash; |
582 | |
583 | /* Simplistic hash function for aux_cache_entry_id. */ |
584 | static unsigned int |
585 | aux_cache_entry_id_hash (struct aux_cache_entry_id *id) |
586 | { |
587 | uint64_t ret = ((id->ino * 11 + id->ctime) * 11 + id->size) * 11 + id->dev; |
588 | return ret ^ (ret >> 32); |
589 | } |
590 | |
591 | static size_t nextprime (size_t x) |
592 | { |
593 | for (unsigned int i = 0; i < sizeof (primes) / sizeof (primes[0]); ++i) |
594 | if (primes[i] >= x) |
595 | return primes[i]; |
596 | return x; |
597 | } |
598 | |
599 | void |
600 | init_aux_cache (void) |
601 | { |
602 | aux_hash_size = primes[3]; |
603 | aux_hash = xcalloc (aux_hash_size, sizeof (struct aux_cache_entry *)); |
604 | } |
605 | |
606 | int |
607 | search_aux_cache (struct stat64 *stat_buf, int *flags, |
608 | unsigned int *osversion, char **soname) |
609 | { |
610 | struct aux_cache_entry_id id; |
611 | id.ino = (uint64_t) stat_buf->st_ino; |
612 | id.ctime = (uint64_t) stat_buf->st_ctime; |
613 | id.size = (uint64_t) stat_buf->st_size; |
614 | id.dev = (uint64_t) stat_buf->st_dev; |
615 | |
616 | unsigned int hash = aux_cache_entry_id_hash (&id); |
617 | struct aux_cache_entry *entry; |
618 | for (entry = aux_hash[hash % aux_hash_size]; entry; entry = entry->next) |
619 | if (id.ino == entry->id.ino |
620 | && id.ctime == entry->id.ctime |
621 | && id.size == entry->id.size |
622 | && id.dev == entry->id.dev) |
623 | { |
624 | *flags = entry->flags; |
625 | *osversion = entry->osversion; |
626 | if (entry->soname != NULL) |
627 | *soname = xstrdup (entry->soname); |
628 | else |
629 | *soname = NULL; |
630 | entry->used = 1; |
631 | return 1; |
632 | } |
633 | |
634 | return 0; |
635 | } |
636 | |
637 | static void |
638 | insert_to_aux_cache (struct aux_cache_entry_id *id, int flags, |
639 | unsigned int osversion, const char *soname, int used) |
640 | { |
641 | size_t hash = aux_cache_entry_id_hash (id) % aux_hash_size; |
642 | struct aux_cache_entry *entry; |
643 | for (entry = aux_hash[hash]; entry; entry = entry->next) |
644 | if (id->ino == entry->id.ino |
645 | && id->ctime == entry->id.ctime |
646 | && id->size == entry->id.size |
647 | && id->dev == entry->id.dev) |
648 | abort (); |
649 | |
650 | size_t len = soname ? strlen (soname) + 1 : 0; |
651 | entry = xmalloc (sizeof (struct aux_cache_entry) + len); |
652 | entry->id = *id; |
653 | entry->flags = flags; |
654 | entry->osversion = osversion; |
655 | entry->used = used; |
656 | if (soname != NULL) |
657 | entry->soname = memcpy ((char *) (entry + 1), soname, len); |
658 | else |
659 | entry->soname = NULL; |
660 | entry->next = aux_hash[hash]; |
661 | aux_hash[hash] = entry; |
662 | } |
663 | |
664 | void |
665 | add_to_aux_cache (struct stat64 *stat_buf, int flags, |
666 | unsigned int osversion, const char *soname) |
667 | { |
668 | struct aux_cache_entry_id id; |
669 | id.ino = (uint64_t) stat_buf->st_ino; |
670 | id.ctime = (uint64_t) stat_buf->st_ctime; |
671 | id.size = (uint64_t) stat_buf->st_size; |
672 | id.dev = (uint64_t) stat_buf->st_dev; |
673 | insert_to_aux_cache (&id, flags, osversion, soname, 1); |
674 | } |
675 | |
676 | /* Load auxiliary cache to search for unchanged entries. */ |
677 | void |
678 | load_aux_cache (const char *aux_cache_name) |
679 | { |
680 | int fd = open (aux_cache_name, O_RDONLY); |
681 | if (fd < 0) |
682 | { |
683 | init_aux_cache (); |
684 | return; |
685 | } |
686 | |
687 | struct stat64 st; |
688 | if (fstat64 (fd, &st) < 0 || st.st_size < sizeof (struct aux_cache_file)) |
689 | { |
690 | close (fd); |
691 | init_aux_cache (); |
692 | return; |
693 | } |
694 | |
695 | size_t aux_cache_size = st.st_size; |
696 | struct aux_cache_file *aux_cache |
697 | = mmap (NULL, aux_cache_size, PROT_READ, MAP_PRIVATE, fd, 0); |
698 | if (aux_cache == MAP_FAILED |
699 | || aux_cache_size < sizeof (struct aux_cache_file) |
700 | || memcmp (aux_cache->magic, AUX_CACHEMAGIC, sizeof AUX_CACHEMAGIC - 1) |
701 | || aux_cache_size != (sizeof(struct aux_cache_file) + |
702 | aux_cache->nlibs * sizeof(struct aux_cache_file_entry) + |
703 | aux_cache->len_strings)) |
704 | { |
705 | close (fd); |
706 | init_aux_cache (); |
707 | return; |
708 | } |
709 | |
710 | aux_hash_size = nextprime (aux_cache->nlibs); |
711 | aux_hash = xcalloc (aux_hash_size, sizeof (struct aux_cache_entry *)); |
712 | |
713 | const char *aux_cache_data |
714 | = (const char *) &aux_cache->libs[aux_cache->nlibs]; |
715 | for (unsigned int i = 0; i < aux_cache->nlibs; ++i) |
716 | insert_to_aux_cache (&aux_cache->libs[i].id, |
717 | aux_cache->libs[i].flags, |
718 | aux_cache->libs[i].osversion, |
719 | aux_cache->libs[i].soname == 0 |
720 | ? NULL : aux_cache_data + aux_cache->libs[i].soname, |
721 | 0); |
722 | |
723 | munmap (aux_cache, aux_cache_size); |
724 | close (fd); |
725 | } |
726 | |
727 | /* Save the contents of the auxiliary cache. */ |
728 | void |
729 | save_aux_cache (const char *aux_cache_name) |
730 | { |
731 | /* Count the length of all sonames. We start with empty string. */ |
732 | size_t total_strlen = 1; |
733 | /* Number of cache entries. */ |
734 | int cache_entry_count = 0; |
735 | |
736 | for (size_t i = 0; i < aux_hash_size; ++i) |
737 | for (struct aux_cache_entry *entry = aux_hash[i]; |
738 | entry != NULL; entry = entry->next) |
739 | if (entry->used) |
740 | { |
741 | ++cache_entry_count; |
742 | if (entry->soname != NULL) |
743 | total_strlen += strlen (entry->soname) + 1; |
744 | } |
745 | |
746 | /* Auxiliary cache. */ |
747 | size_t file_entries_size |
748 | = sizeof (struct aux_cache_file) |
749 | + cache_entry_count * sizeof (struct aux_cache_file_entry); |
750 | struct aux_cache_file *file_entries |
751 | = xmalloc (file_entries_size + total_strlen); |
752 | |
753 | /* Fill in the header of the auxiliary cache. */ |
754 | memset (file_entries, '\0', sizeof (struct aux_cache_file)); |
755 | memcpy (file_entries->magic, AUX_CACHEMAGIC, sizeof AUX_CACHEMAGIC - 1); |
756 | |
757 | file_entries->nlibs = cache_entry_count; |
758 | file_entries->len_strings = total_strlen; |
759 | |
760 | /* Initial String offset for auxiliary cache is always after the |
761 | special empty string. */ |
762 | unsigned int str_offset = 1; |
763 | |
764 | /* An array for all strings. */ |
765 | char *str = (char *) file_entries + file_entries_size; |
766 | *str++ = '\0'; |
767 | |
768 | size_t idx = 0; |
769 | for (size_t i = 0; i < aux_hash_size; ++i) |
770 | for (struct aux_cache_entry *entry = aux_hash[i]; |
771 | entry != NULL; entry = entry->next) |
772 | if (entry->used) |
773 | { |
774 | file_entries->libs[idx].id = entry->id; |
775 | file_entries->libs[idx].flags = entry->flags; |
776 | if (entry->soname == NULL) |
777 | file_entries->libs[idx].soname = 0; |
778 | else |
779 | { |
780 | file_entries->libs[idx].soname = str_offset; |
781 | |
782 | size_t len = strlen (entry->soname) + 1; |
783 | str = mempcpy (str, entry->soname, len); |
784 | str_offset += len; |
785 | } |
786 | file_entries->libs[idx].osversion = entry->osversion; |
787 | file_entries->libs[idx++].pad = 0; |
788 | } |
789 | |
790 | /* Write out auxiliary cache file. */ |
791 | /* Write auxiliary cache first to a temporary file and rename it later. */ |
792 | |
793 | char *temp_name = xmalloc (strlen (aux_cache_name) + 2); |
794 | sprintf (temp_name, "%s~" , aux_cache_name); |
795 | |
796 | /* Check that directory exists and create if needed. */ |
797 | char *dir = strdupa (aux_cache_name); |
798 | dir = dirname (dir); |
799 | |
800 | struct stat64 st; |
801 | if (stat64 (dir, &st) < 0) |
802 | { |
803 | if (mkdir (dir, 0700) < 0) |
804 | goto out_fail; |
805 | } |
806 | |
807 | /* Create file. */ |
808 | int fd = open (temp_name, O_CREAT|O_WRONLY|O_TRUNC|O_NOFOLLOW, |
809 | S_IRUSR|S_IWUSR); |
810 | if (fd < 0) |
811 | goto out_fail; |
812 | |
813 | if (write (fd, file_entries, file_entries_size + total_strlen) |
814 | != (ssize_t) (file_entries_size + total_strlen) |
815 | || close (fd)) |
816 | { |
817 | unlink (temp_name); |
818 | goto out_fail; |
819 | } |
820 | |
821 | /* Move temporary to its final location. */ |
822 | if (rename (temp_name, aux_cache_name)) |
823 | unlink (temp_name); |
824 | |
825 | out_fail: |
826 | /* Free allocated memory. */ |
827 | free (temp_name); |
828 | free (file_entries); |
829 | } |
830 | |