1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2007 Kai Wang
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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #include <sys/endian.h>
31 #include <sys/mman.h>
32 #include <sys/queue.h>
33 #include <sys/stat.h>
34 #include <archive.h>
35 #include <archive_entry.h>
36 #include <assert.h>
37 #include <errno.h>
38 #include <fcntl.h>
39 #include <gelf.h>
40 #include <libgen.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45
46 #include "ar.h"
47
48 #define _ARMAG_LEN 8 /* length of ar magic string */
49 #define _ARHDR_LEN 60 /* length of ar header */
50 #define _INIT_AS_CAP 128 /* initial archive string table size */
51 #define _INIT_SYMOFF_CAP (256*(sizeof(uint64_t))) /* initial so table size */
52 #define _INIT_SYMNAME_CAP 1024 /* initial sn table size */
53 #define _MAXNAMELEN_SVR4 15 /* max member name length in svr4 variant */
54 #define _TRUNCATE_LEN 15 /* number of bytes to keep for member name */
55
56 static void add_to_ar_str_table(struct bsdar *bsdar, const char *name);
57 static void add_to_ar_sym_table(struct bsdar *bsdar, const char *name);
58 static struct ar_obj *create_obj_from_file(struct bsdar *bsdar,
59 const char *name, time_t mtime);
60 static void create_symtab_entry(struct bsdar *bsdar, void *maddr,
61 size_t size);
62 static void free_obj(struct bsdar *bsdar, struct ar_obj *obj);
63 static void insert_obj(struct bsdar *bsdar, struct ar_obj *obj,
64 struct ar_obj *pos);
65 static void prefault_buffer(const char *buf, size_t s);
66 static void read_objs(struct bsdar *bsdar, const char *archive,
67 int checkargv);
68 static void write_cleanup(struct bsdar *bsdar);
69 static void write_data(struct bsdar *bsdar, struct archive *a,
70 const void *buf, size_t s);
71 static void write_objs(struct bsdar *bsdar);
72
73 /*
74 * Create object from file, return created obj upon success, or NULL
75 * when an error occurs or the member is not newer than existing
76 * one while -u is specified.
77 */
78 static struct ar_obj *
create_obj_from_file(struct bsdar * bsdar,const char * name,time_t mtime)79 create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime)
80 {
81 struct ar_obj *obj;
82 struct stat sb;
83 const char *bname;
84 char *tmpname;
85
86 if (name == NULL)
87 return (NULL);
88
89 obj = malloc(sizeof(struct ar_obj));
90 if (obj == NULL)
91 bsdar_errc(bsdar, errno, "malloc failed");
92 if ((obj->fd = open(name, O_RDONLY, 0)) < 0) {
93 bsdar_warnc(bsdar, errno, "can't open file: %s", name);
94 free(obj);
95 return (NULL);
96 }
97
98 tmpname = strdup(name);
99 if (tmpname == NULL)
100 bsdar_errc(bsdar, errno, "strdup failed");
101 if ((bname = basename(tmpname)) == NULL)
102 bsdar_errc(bsdar, errno, "basename failed");
103 if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) {
104 if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL)
105 bsdar_errc(bsdar, errno, "malloc failed");
106 (void)strncpy(obj->name, bname, _TRUNCATE_LEN);
107 obj->name[_TRUNCATE_LEN] = '\0';
108 } else
109 if ((obj->name = strdup(bname)) == NULL)
110 bsdar_errc(bsdar, errno, "strdup failed");
111 free(tmpname);
112
113 if (fstat(obj->fd, &sb) < 0) {
114 bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name);
115 goto giveup;
116 }
117 if (!S_ISREG(sb.st_mode)) {
118 bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name);
119 goto giveup;
120 }
121
122 /*
123 * When option '-u' is specified and member is not newer than the
124 * existing one, the replacement will not happen. While if mtime == 0,
125 * which indicates that this is to "replace a none exist member",
126 * the replace will proceed regardless of '-u'.
127 */
128 if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime)
129 goto giveup;
130
131 /*
132 * When option '-D' is specified, mtime and UID / GID from the file
133 * will be replaced with 0, and file mode with 644. This ensures that
134 * checksums will match for two archives containing the exact same
135 * files.
136 */
137 if (bsdar->options & AR_D) {
138 obj->uid = 0;
139 obj->gid = 0;
140 obj->mtime = 0;
141 obj->md = S_IFREG | 0644;
142 } else {
143 obj->uid = sb.st_uid;
144 obj->gid = sb.st_gid;
145 obj->mtime = sb.st_mtime;
146 obj->md = sb.st_mode;
147 }
148 obj->size = sb.st_size;
149 obj->dev = sb.st_dev;
150 obj->ino = sb.st_ino;
151
152 if (obj->size == 0) {
153 obj->maddr = NULL;
154 return (obj);
155 }
156
157 if ((obj->maddr = mmap(NULL, obj->size, PROT_READ,
158 MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) {
159 bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name);
160 goto giveup;
161 }
162 if (close(obj->fd) < 0)
163 bsdar_errc(bsdar, errno, "close failed: %s",
164 obj->name);
165
166 return (obj);
167
168 giveup:
169 if (close(obj->fd) < 0)
170 bsdar_errc(bsdar, errno, "close failed: %s",
171 obj->name);
172 free(obj->name);
173 free(obj);
174 return (NULL);
175 }
176
177 /*
178 * Free object itself and its associated allocations.
179 */
180 static void
free_obj(struct bsdar * bsdar,struct ar_obj * obj)181 free_obj(struct bsdar *bsdar, struct ar_obj *obj)
182 {
183 if (obj->fd == -1)
184 free(obj->maddr);
185 else
186 if (obj->maddr != NULL && munmap(obj->maddr, obj->size))
187 bsdar_warnc(bsdar, errno,
188 "can't munmap file: %s", obj->name);
189 free(obj->name);
190 free(obj);
191 }
192
193 /*
194 * Insert obj to the tail, or before/after the pos obj.
195 */
196 static void
insert_obj(struct bsdar * bsdar,struct ar_obj * obj,struct ar_obj * pos)197 insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos)
198 {
199 if (obj == NULL)
200 bsdar_errc(bsdar, 0, "try to insert a null obj");
201
202 if (pos == NULL || obj == pos)
203 /*
204 * If the object to move happens to be the position obj,
205 * or if there is not a pos obj, move it to tail.
206 */
207 goto tail;
208
209 if (bsdar->options & AR_B) {
210 TAILQ_INSERT_BEFORE(pos, obj, objs);
211 return;
212 }
213 if (bsdar->options & AR_A) {
214 TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs);
215 return;
216 }
217
218 tail:
219 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
220
221 }
222
223 /*
224 * Read objects from archive into v_obj list. Note that checkargv is
225 * set when read_objs is used to read objects from the target of
226 * ADDLIB command (ar script mode), in this case argv array possibly
227 * specifies the members ADDLIB want.
228 */
229 static void
read_objs(struct bsdar * bsdar,const char * archive,int checkargv)230 read_objs(struct bsdar *bsdar, const char *archive, int checkargv)
231 {
232 struct archive *a;
233 struct archive_entry *entry;
234 struct ar_obj *obj;
235 const char *name;
236 const char *bname;
237 char *buff;
238 char **av;
239 size_t size;
240 int i, r, find;
241
242 if ((a = archive_read_new()) == NULL)
243 bsdar_errc(bsdar, 0, "archive_read_new failed");
244 archive_read_support_format_ar(a);
245 AC(archive_read_open_filename(a, archive, DEF_BLKSZ));
246 for (;;) {
247 r = archive_read_next_header(a, &entry);
248 if (r == ARCHIVE_FATAL)
249 bsdar_errc(bsdar, archive_errno(a), "%s",
250 archive_error_string(a));
251 if (r == ARCHIVE_EOF)
252 break;
253 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY)
254 bsdar_warnc(bsdar, archive_errno(a), "%s",
255 archive_error_string(a));
256 if (r == ARCHIVE_RETRY) {
257 bsdar_warnc(bsdar, 0, "Retrying...");
258 continue;
259 }
260
261 name = archive_entry_pathname(entry);
262
263 /*
264 * skip pseudo members.
265 */
266 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0)
267 continue;
268
269 /*
270 * If checkargv is set, only read those members specified
271 * in argv.
272 */
273 if (checkargv && bsdar->argc > 0) {
274 find = 0;
275 for(i = 0; i < bsdar->argc; i++) {
276 av = &bsdar->argv[i];
277 if (*av == NULL)
278 continue;
279 if ((bname = basename(*av)) == NULL)
280 bsdar_errc(bsdar, errno,
281 "basename failed");
282 if (strcmp(bname, name) != 0)
283 continue;
284
285 *av = NULL;
286 find = 1;
287 break;
288 }
289 if (!find)
290 continue;
291 }
292
293 size = archive_entry_size(entry);
294
295 if (size > 0) {
296 if ((buff = malloc(size)) == NULL)
297 bsdar_errc(bsdar, errno, "malloc failed");
298 if (archive_read_data(a, buff, size) != (ssize_t)size) {
299 bsdar_warnc(bsdar, archive_errno(a), "%s",
300 archive_error_string(a));
301 free(buff);
302 continue;
303 }
304 } else
305 buff = NULL;
306
307 obj = malloc(sizeof(struct ar_obj));
308 if (obj == NULL)
309 bsdar_errc(bsdar, errno, "malloc failed");
310 obj->maddr = buff;
311 if ((obj->name = strdup(name)) == NULL)
312 bsdar_errc(bsdar, errno, "strdup failed");
313 obj->size = size;
314 obj->uid = archive_entry_uid(entry);
315 obj->gid = archive_entry_gid(entry);
316 obj->md = archive_entry_mode(entry);
317 obj->mtime = archive_entry_mtime(entry);
318 obj->dev = 0;
319 obj->ino = 0;
320
321 /*
322 * Objects from archive have obj->fd set to -1,
323 * for the ease of cleaning up.
324 */
325 obj->fd = -1;
326 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
327 }
328 AC(archive_read_close(a));
329 AC(archive_read_free(a));
330 }
331
332 /*
333 * Determine the constitution of resulting archive.
334 */
335 int
ar_write_archive(struct bsdar * bsdar,int mode)336 ar_write_archive(struct bsdar *bsdar, int mode)
337 {
338 struct ar_obj *nobj, *obj, *obj_temp, *pos;
339 struct stat sb;
340 const char *bname;
341 char **av;
342 int exitcode, i;
343
344 TAILQ_INIT(&bsdar->v_obj);
345 exitcode = EXIT_SUCCESS;
346 nobj = NULL;
347 pos = NULL;
348 memset(&sb, 0, sizeof(sb));
349
350 assert(mode == 'A' || mode == 'd' || mode == 'm' || mode == 'q' ||
351 mode == 'r' || mode == 's');
352
353 /*
354 * Test if the specified archive exists, to figure out
355 * whether we are creating one here.
356 */
357 if (stat(bsdar->filename, &sb) != 0) {
358 if (errno != ENOENT) {
359 bsdar_warnc(bsdar, 0, "stat %s failed",
360 bsdar->filename);
361 return (EXIT_FAILURE);
362 }
363
364 /* We do not create archive in mode 'd', 'm' and 's'. */
365 if (mode != 'r' && mode != 'q') {
366 bsdar_warnc(bsdar, 0, "%s: no such file",
367 bsdar->filename);
368 return (EXIT_FAILURE);
369 }
370
371 /* Issue a warning if -c is not specified when creating. */
372 if (!(bsdar->options & AR_C))
373 bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename);
374 goto new_archive;
375 }
376
377 /*
378 * First read members from existing archive.
379 */
380 read_objs(bsdar, bsdar->filename, 0);
381
382 /*
383 * For mode 's', no member will be moved, deleted or replaced.
384 */
385 if (mode == 's')
386 goto write_objs;
387
388 /*
389 * For mode 'q', we don't need to adjust existing members either.
390 * Also, -a, -b and -i are ignored in this mode. New members are
391 * always inserted at tail.
392 */
393 if (mode == 'q')
394 goto new_archive;
395
396 /*
397 * Mode 'A' adds the contents of another archive to the tail of
398 * current archive. Note that mode 'A' is a special mode for the
399 * ADDLIB command of the ar script mode. Currently there is no
400 * access to this function from the ar command line mode.
401 */
402 if (mode == 'A') {
403 /*
404 * Read objects from the target archive of ADDLIB command.
405 * If there are members specified in argv, read those members
406 * only, otherwise the entire archive will be read.
407 */
408 read_objs(bsdar, bsdar->addlib, 1);
409 goto write_objs;
410 }
411
412 /*
413 * Try to find the position member specified by user.
414 */
415 if (bsdar->options & AR_A || bsdar->options & AR_B) {
416 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
417 if (strcmp(obj->name, bsdar->posarg) == 0) {
418 pos = obj;
419 break;
420 }
421 }
422
423 /*
424 * If can't find `pos' specified by user,
425 * silently insert objects at tail.
426 */
427 if (pos == NULL)
428 bsdar->options &= ~(AR_A | AR_B);
429 }
430
431 for (i = 0; i < bsdar->argc; i++) {
432 av = &bsdar->argv[i];
433
434 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
435 if ((bname = basename(*av)) == NULL)
436 bsdar_errc(bsdar, errno, "basename failed");
437 if (bsdar->options & AR_TR) {
438 if (strncmp(bname, obj->name, _TRUNCATE_LEN))
439 continue;
440 } else
441 if (strcmp(bname, obj->name) != 0)
442 continue;
443
444 if (mode == 'r') {
445 /*
446 * if the new member is not qualified
447 * to replace the old one, skip it.
448 */
449 nobj = create_obj_from_file(bsdar, *av,
450 obj->mtime);
451 if (nobj == NULL) {
452 exitcode = EXIT_FAILURE;
453 goto skip_obj;
454 }
455 }
456
457 if (bsdar->options & AR_V)
458 (void)fprintf(stdout, "%c - %s\n", mode,
459 *av);
460
461 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
462 if (mode == 'd' || mode == 'r')
463 free_obj(bsdar, obj);
464
465 if (mode == 'm')
466 insert_obj(bsdar, obj, pos);
467 if (mode == 'r')
468 insert_obj(bsdar, nobj, pos);
469
470 skip_obj:
471 *av = NULL;
472 break;
473 }
474
475 }
476
477 new_archive:
478 /*
479 * When operating in mode 'r', directly add those user specified
480 * objects which do not exist in current archive. When operating
481 * in mode 'q', all objects specified in command line args are
482 * appended to the archive, without comparing with existing ones.
483 */
484 for (i = 0; i < bsdar->argc; i++) {
485 av = &bsdar->argv[i];
486 if (*av != NULL && (mode == 'r' || mode == 'q')) {
487 nobj = create_obj_from_file(bsdar, *av, 0);
488 if (nobj == NULL) {
489 exitcode = EXIT_FAILURE;
490 *av = NULL;
491 continue;
492 }
493 insert_obj(bsdar, nobj, pos);
494 if (bsdar->options & AR_V && nobj != NULL)
495 (void)fprintf(stdout, "a - %s\n", *av);
496 *av = NULL;
497 }
498 }
499
500 write_objs:
501 write_objs(bsdar);
502 write_cleanup(bsdar);
503
504 return (exitcode);
505 }
506
507 /*
508 * Memory cleaning up.
509 */
510 static void
write_cleanup(struct bsdar * bsdar)511 write_cleanup(struct bsdar *bsdar)
512 {
513 struct ar_obj *obj, *obj_temp;
514
515 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
516 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
517 free_obj(bsdar, obj);
518 }
519
520 free(bsdar->as);
521 free(bsdar->s_so);
522 free(bsdar->s_sn);
523 bsdar->as = NULL;
524 bsdar->s_so = NULL;
525 bsdar->s_so_max = 0;
526 bsdar->s_sn = NULL;
527 }
528
529 /*
530 * Fault in the buffer prior to writing as a workaround for poor performance
531 * due to interaction with kernel fs deadlock avoidance code. See the comment
532 * above vn_io_fault_doio() in sys/kern/vfs_vnops.c for details of the issue.
533 */
534 static void
prefault_buffer(const char * buf,size_t s)535 prefault_buffer(const char *buf, size_t s)
536 {
537 volatile const char *p;
538 size_t page_size;
539
540 if (s == 0)
541 return;
542 page_size = sysconf(_SC_PAGESIZE);
543 for (p = buf; p < buf + s; p += page_size)
544 *p;
545 /*
546 * Ensure we touch the last page as well, in case the buffer is not
547 * page-aligned.
548 */
549 *(volatile const char *)(buf + s - 1);
550 }
551
552 /*
553 * Wrapper for archive_write_data().
554 */
555 static void
write_data(struct bsdar * bsdar,struct archive * a,const void * buf,size_t s)556 write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s)
557 {
558 ssize_t written;
559
560 prefault_buffer(buf, s);
561 while (s > 0) {
562 written = archive_write_data(a, buf, s);
563 if (written < 0)
564 bsdar_errc(bsdar, archive_errno(a), "%s",
565 archive_error_string(a));
566 buf = (const char *)buf + written;
567 s -= written;
568 }
569 }
570
571 /*
572 * Write the resulting archive members.
573 */
574 static void
write_objs(struct bsdar * bsdar)575 write_objs(struct bsdar *bsdar)
576 {
577 struct ar_obj *obj;
578 struct archive *a;
579 struct archive_entry *entry;
580 size_t s_sz; /* size of archive symbol table. */
581 size_t pm_sz; /* size of pseudo members */
582 size_t w_sz; /* size of words in symbol table */
583 size_t i;
584 uint64_t nr;
585 uint32_t nr32;
586
587 if (elf_version(EV_CURRENT) == EV_NONE)
588 bsdar_errc(bsdar, 0, "ELF library initialization failed: %s",
589 elf_errmsg(-1));
590
591 bsdar->rela_off = 0;
592
593 /* Create archive symbol table and archive string table, if need. */
594 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
595 if (!(bsdar->options & AR_SS) && obj->maddr != NULL)
596 create_symtab_entry(bsdar, obj->maddr, obj->size);
597 if (strlen(obj->name) > _MAXNAMELEN_SVR4)
598 add_to_ar_str_table(bsdar, obj->name);
599 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2;
600 }
601
602 /*
603 * Pad the symbol name string table. It is treated specially because
604 * symbol name table should be padded by a '\0', not the common '\n'
605 * for other members. The size of sn table includes the pad bit.
606 */
607 if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0)
608 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
609
610 /*
611 * Archive string table is padded by a "\n" as the normal members.
612 * The difference is that the size of archive string table counts
613 * in the pad bit, while normal members' size fields do not.
614 */
615 if (bsdar->as != NULL && bsdar->as_sz % 2 != 0)
616 bsdar->as[bsdar->as_sz++] = '\n';
617
618 /*
619 * If there is a symbol table, calculate the size of pseudo members,
620 * convert previously stored relative offsets to absolute ones, and
621 * then make them Big Endian.
622 *
623 * absolute_offset = htobe32(relative_offset + size_of_pseudo_members)
624 */
625 w_sz = sizeof(uint32_t);
626 if (bsdar->s_cnt != 0) {
627 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz;
628 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz);
629 if (bsdar->as != NULL)
630 pm_sz += _ARHDR_LEN + bsdar->as_sz;
631 /* Use the 64-bit word size format if necessary. */
632 if (bsdar->s_so_max > UINT32_MAX - pm_sz) {
633 w_sz = sizeof(uint64_t);
634 pm_sz -= s_sz;
635 s_sz = (bsdar->s_cnt + 1) * sizeof(uint64_t) +
636 bsdar->s_sn_sz;
637 pm_sz += s_sz;
638 /* Convert to big-endian. */
639 for (i = 0; i < bsdar->s_cnt; i++)
640 bsdar->s_so[i] =
641 htobe64(bsdar->s_so[i] + pm_sz);
642 } else {
643 /*
644 * Convert to big-endian and shuffle in-place to
645 * the front of the allocation. XXX UB
646 */
647 for (i = 0; i < bsdar->s_cnt; i++)
648 ((uint32_t *)(bsdar->s_so))[i] =
649 htobe32(bsdar->s_so[i] + pm_sz);
650 }
651 }
652
653 if ((a = archive_write_new()) == NULL)
654 bsdar_errc(bsdar, 0, "archive_write_new failed");
655
656 archive_write_set_format_ar_svr4(a);
657
658 AC(archive_write_open_filename(a, bsdar->filename));
659
660 /*
661 * write the archive symbol table, if there is one.
662 * If options -s is explicitly specified or we are invoked
663 * as ranlib, write the symbol table even if it is empty.
664 */
665 if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) ||
666 bsdar->options & AR_S) {
667 entry = archive_entry_new();
668 if (entry == NULL)
669 bsdar_errc(bsdar, 0, "archive_entry_new failed");
670 if (w_sz == sizeof(uint64_t))
671 archive_entry_copy_pathname(entry, "/SYM64/");
672 else
673 archive_entry_copy_pathname(entry, "/");
674 if ((bsdar->options & AR_D) == 0)
675 archive_entry_set_mtime(entry, time(NULL), 0);
676 archive_entry_set_size(entry, (bsdar->s_cnt + 1) * w_sz +
677 bsdar->s_sn_sz);
678 AC(archive_write_header(a, entry));
679 if (w_sz == sizeof(uint64_t)) {
680 nr = htobe64(bsdar->s_cnt);
681 write_data(bsdar, a, &nr, sizeof(nr));
682 } else {
683 nr32 = htobe32((uint32_t)bsdar->s_cnt);
684 write_data(bsdar, a, &nr32, sizeof(nr32));
685 }
686 write_data(bsdar, a, bsdar->s_so, w_sz * bsdar->s_cnt);
687 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
688 archive_entry_free(entry);
689 }
690
691 /* write the archive string table, if any. */
692 if (bsdar->as != NULL) {
693 entry = archive_entry_new();
694 if (entry == NULL)
695 bsdar_errc(bsdar, 0, "archive_entry_new failed");
696 archive_entry_copy_pathname(entry, "//");
697 archive_entry_set_size(entry, bsdar->as_sz);
698 AC(archive_write_header(a, entry));
699 write_data(bsdar, a, bsdar->as, bsdar->as_sz);
700 archive_entry_free(entry);
701 }
702
703 /* write normal members. */
704 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
705 entry = archive_entry_new();
706 if (entry == NULL)
707 bsdar_errc(bsdar, 0, "archive_entry_new failed");
708 archive_entry_copy_pathname(entry, obj->name);
709 archive_entry_set_uid(entry, obj->uid);
710 archive_entry_set_gid(entry, obj->gid);
711 archive_entry_set_mode(entry, obj->md);
712 archive_entry_set_size(entry, obj->size);
713 archive_entry_set_mtime(entry, obj->mtime, 0);
714 archive_entry_set_dev(entry, obj->dev);
715 archive_entry_set_ino(entry, obj->ino);
716 archive_entry_set_filetype(entry, AE_IFREG);
717 AC(archive_write_header(a, entry));
718 write_data(bsdar, a, obj->maddr, obj->size);
719 archive_entry_free(entry);
720 }
721
722 AC(archive_write_close(a));
723 AC(archive_write_free(a));
724 }
725
726 /*
727 * Extract global symbols from ELF binary members.
728 */
729 static void
create_symtab_entry(struct bsdar * bsdar,void * maddr,size_t size)730 create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size)
731 {
732 Elf *e;
733 Elf_Scn *scn;
734 GElf_Shdr shdr;
735 GElf_Sym sym;
736 Elf_Data *data;
737 char *name;
738 size_t n, shstrndx;
739 int elferr, tabndx, len, i;
740
741 if ((e = elf_memory(maddr, size)) == NULL) {
742 bsdar_warnc(bsdar, 0, "elf_memory() failed: %s",
743 elf_errmsg(-1));
744 return;
745 }
746 if (elf_kind(e) != ELF_K_ELF) {
747 /* Silently ignore non-elf member. */
748 elf_end(e);
749 return;
750 }
751 if (elf_getshstrndx(e, &shstrndx) == 0) {
752 bsdar_warnc(bsdar, 0, "elf_getshstrndx failed: %s",
753 elf_errmsg(-1));
754 elf_end(e);
755 return;
756 }
757
758 tabndx = -1;
759 scn = NULL;
760 while ((scn = elf_nextscn(e, scn)) != NULL) {
761 if (gelf_getshdr(scn, &shdr) != &shdr) {
762 bsdar_warnc(bsdar, 0,
763 "elf_getshdr failed: %s", elf_errmsg(-1));
764 continue;
765 }
766 if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) {
767 bsdar_warnc(bsdar, 0,
768 "elf_strptr failed: %s", elf_errmsg(-1));
769 continue;
770 }
771 if (strcmp(name, ".strtab") == 0) {
772 tabndx = elf_ndxscn(scn);
773 break;
774 }
775 }
776 elferr = elf_errno();
777 if (elferr != 0)
778 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
779 elf_errmsg(elferr));
780 if (tabndx == -1) {
781 bsdar_warnc(bsdar, 0, "can't find .strtab section");
782 elf_end(e);
783 return;
784 }
785
786 scn = NULL;
787 while ((scn = elf_nextscn(e, scn)) != NULL) {
788 if (gelf_getshdr(scn, &shdr) != &shdr) {
789 bsdar_warnc(bsdar, 0, "elf_getshdr failed: %s",
790 elf_errmsg(-1));
791 continue;
792 }
793 if (shdr.sh_type != SHT_SYMTAB)
794 continue;
795
796 data = NULL;
797 n = 0;
798 while (n < shdr.sh_size &&
799 (data = elf_getdata(scn, data)) != NULL) {
800 len = data->d_size / shdr.sh_entsize;
801 for (i = 0; i < len; i++) {
802 if (gelf_getsym(data, i, &sym) != &sym) {
803 bsdar_warnc(bsdar, 0,
804 "gelf_getsym failed: %s",
805 elf_errmsg(-1));
806 continue;
807 }
808
809 /* keep only global or weak symbols */
810 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL &&
811 GELF_ST_BIND(sym.st_info) != STB_WEAK)
812 continue;
813
814 /* keep only defined symbols */
815 if (sym.st_shndx == SHN_UNDEF)
816 continue;
817
818 if ((name = elf_strptr(e, tabndx,
819 sym.st_name)) == NULL) {
820 bsdar_warnc(bsdar, 0,
821 "elf_strptr failed: %s",
822 elf_errmsg(-1));
823 continue;
824 }
825
826 add_to_ar_sym_table(bsdar, name);
827 }
828 }
829 }
830 elferr = elf_errno();
831 if (elferr != 0)
832 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
833 elf_errmsg(elferr));
834
835 elf_end(e);
836 }
837
838 /*
839 * Append to the archive string table buffer.
840 */
841 static void
add_to_ar_str_table(struct bsdar * bsdar,const char * name)842 add_to_ar_str_table(struct bsdar *bsdar, const char *name)
843 {
844
845 if (bsdar->as == NULL) {
846 bsdar->as_cap = _INIT_AS_CAP;
847 bsdar->as_sz = 0;
848 if ((bsdar->as = malloc(bsdar->as_cap)) == NULL)
849 bsdar_errc(bsdar, errno, "malloc failed");
850 }
851
852 /*
853 * The space required for holding one member name in as table includes:
854 * strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding).
855 */
856 while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) {
857 bsdar->as_cap *= 2;
858 bsdar->as = realloc(bsdar->as, bsdar->as_cap);
859 if (bsdar->as == NULL)
860 bsdar_errc(bsdar, errno, "realloc failed");
861 }
862 strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name));
863 bsdar->as_sz += strlen(name);
864 bsdar->as[bsdar->as_sz++] = '/';
865 bsdar->as[bsdar->as_sz++] = '\n';
866 }
867
868 /*
869 * Append to the archive symbol table buffer.
870 */
871 static void
add_to_ar_sym_table(struct bsdar * bsdar,const char * name)872 add_to_ar_sym_table(struct bsdar *bsdar, const char *name)
873 {
874
875 if (bsdar->s_so == NULL) {
876 if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) ==
877 NULL)
878 bsdar_errc(bsdar, errno, "malloc failed");
879 bsdar->s_so_cap = _INIT_SYMOFF_CAP;
880 bsdar->s_cnt = 0;
881 }
882
883 if (bsdar->s_sn == NULL) {
884 if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL)
885 bsdar_errc(bsdar, errno, "malloc failed");
886 bsdar->s_sn_cap = _INIT_SYMNAME_CAP;
887 bsdar->s_sn_sz = 0;
888 }
889
890 if (bsdar->s_cnt * sizeof(uint64_t) >= bsdar->s_so_cap) {
891 bsdar->s_so_cap *= 2;
892 bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap);
893 if (bsdar->s_so == NULL)
894 bsdar_errc(bsdar, errno, "realloc failed");
895 }
896 bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off;
897 if ((uint64_t)bsdar->rela_off > bsdar->s_so_max)
898 bsdar->s_so_max = (uint64_t)bsdar->rela_off;
899 bsdar->s_cnt++;
900
901 /*
902 * The space required for holding one symbol name in sn table includes:
903 * strlen(name) + (1 for '\n') + (possibly 1 for padding).
904 */
905 while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) {
906 bsdar->s_sn_cap *= 2;
907 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap);
908 if (bsdar->s_sn == NULL)
909 bsdar_errc(bsdar, errno, "realloc failed");
910 }
911 strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name));
912 bsdar->s_sn_sz += strlen(name);
913 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
914 }
915