1 /*-
2 * Copyright (c) 2007 Kai Wang
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 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
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 <errno.h>
37 #include <fcntl.h>
38 #include <gelf.h>
39 #include <libgen.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <sysexits.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(uint32_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_archive(struct bsdar *bsdar, char mode);
69 static void write_cleanup(struct bsdar *bsdar);
70 static void write_data(struct bsdar *bsdar, struct archive *a,
71 const void *buf, size_t s);
72 static void write_objs(struct bsdar *bsdar);
73
74 void
ar_mode_d(struct bsdar * bsdar)75 ar_mode_d(struct bsdar *bsdar)
76 {
77
78 write_archive(bsdar, 'd');
79 }
80
81 void
ar_mode_m(struct bsdar * bsdar)82 ar_mode_m(struct bsdar *bsdar)
83 {
84
85 write_archive(bsdar, 'm');
86 }
87
88 void
ar_mode_q(struct bsdar * bsdar)89 ar_mode_q(struct bsdar *bsdar)
90 {
91
92 write_archive(bsdar, 'q');
93 }
94
95 void
ar_mode_r(struct bsdar * bsdar)96 ar_mode_r(struct bsdar *bsdar)
97 {
98
99 write_archive(bsdar, 'r');
100 }
101
102 void
ar_mode_s(struct bsdar * bsdar)103 ar_mode_s(struct bsdar *bsdar)
104 {
105
106 write_archive(bsdar, 's');
107 }
108
109 void
ar_mode_A(struct bsdar * bsdar)110 ar_mode_A(struct bsdar *bsdar)
111 {
112
113 write_archive(bsdar, 'A');
114 }
115
116 /*
117 * Create object from file, return created obj upon success, or NULL
118 * when an error occurs or the member is not newer than existing
119 * one while -u is specified.
120 */
121 static struct ar_obj *
create_obj_from_file(struct bsdar * bsdar,const char * name,time_t mtime)122 create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime)
123 {
124 struct ar_obj *obj;
125 struct stat sb;
126 const char *bname;
127
128 if (name == NULL)
129 return (NULL);
130
131 obj = malloc(sizeof(struct ar_obj));
132 if (obj == NULL)
133 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
134 if ((obj->fd = open(name, O_RDONLY, 0)) < 0) {
135 bsdar_warnc(bsdar, errno, "can't open file: %s", name);
136 free(obj);
137 return (NULL);
138 }
139
140 if ((bname = basename(name)) == NULL)
141 bsdar_errc(bsdar, EX_SOFTWARE, errno, "basename failed");
142 if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) {
143 if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL)
144 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
145 (void)strncpy(obj->name, bname, _TRUNCATE_LEN);
146 obj->name[_TRUNCATE_LEN] = '\0';
147 } else
148 if ((obj->name = strdup(bname)) == NULL)
149 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
150
151 if (fstat(obj->fd, &sb) < 0) {
152 bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name);
153 goto giveup;
154 }
155 if (!S_ISREG(sb.st_mode)) {
156 bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name);
157 goto giveup;
158 }
159
160 /*
161 * When option '-u' is specified and member is not newer than the
162 * existing one, the replace will not happen. While if mtime == 0,
163 * which indicates that this is to "replace a none exist member",
164 * the replace will proceed regardless of '-u'.
165 */
166 if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime)
167 goto giveup;
168
169 /*
170 * When option '-D' is specified, mtime and UID / GID from the file
171 * will be replaced with 0, and file mode with 644. This ensures that
172 * checksums will match for two archives containing the exact same
173 * files.
174 */
175 if (bsdar->options & AR_D) {
176 obj->uid = 0;
177 obj->gid = 0;
178 obj->mtime = 0;
179 obj->md = S_IFREG | 0644;
180 } else {
181 obj->uid = sb.st_uid;
182 obj->gid = sb.st_gid;
183 obj->mtime = sb.st_mtime;
184 obj->md = sb.st_mode;
185 }
186 obj->size = sb.st_size;
187 obj->dev = sb.st_dev;
188 obj->ino = sb.st_ino;
189
190 if (obj->size == 0) {
191 obj->maddr = NULL;
192 return (obj);
193 }
194
195 if ((obj->maddr = mmap(NULL, obj->size, PROT_READ,
196 MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) {
197 bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name);
198 goto giveup;
199 }
200 if (close(obj->fd) < 0)
201 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
202 obj->name);
203
204 return (obj);
205
206 giveup:
207 if (close(obj->fd) < 0)
208 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
209 obj->name);
210 free(obj->name);
211 free(obj);
212 return (NULL);
213 }
214
215 /*
216 * Free object itself and its associated allocations.
217 */
218 static void
free_obj(struct bsdar * bsdar,struct ar_obj * obj)219 free_obj(struct bsdar *bsdar, struct ar_obj *obj)
220 {
221 if (obj->fd == -1)
222 free(obj->maddr);
223 else
224 if (obj->maddr != NULL && munmap(obj->maddr, obj->size))
225 bsdar_warnc(bsdar, errno,
226 "can't munmap file: %s", obj->name);
227 free(obj->name);
228 free(obj);
229 }
230
231 /*
232 * Insert obj to the tail, or before/after the pos obj.
233 */
234 static void
insert_obj(struct bsdar * bsdar,struct ar_obj * obj,struct ar_obj * pos)235 insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos)
236 {
237 if (obj == NULL)
238 bsdar_errc(bsdar, EX_SOFTWARE, 0, "try to insert a null obj");
239
240 if (pos == NULL || obj == pos)
241 /*
242 * If the object to move happens to be the position obj,
243 * or if there is not a pos obj, move it to tail.
244 */
245 goto tail;
246
247 if (bsdar->options & AR_B) {
248 TAILQ_INSERT_BEFORE(pos, obj, objs);
249 return;
250 }
251 if (bsdar->options & AR_A) {
252 TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs);
253 return;
254 }
255
256 tail:
257 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
258
259 }
260
261 /*
262 * Read objects from archive into v_obj list. Note that checkargv is
263 * set when read_objs is used to read objects from the target of
264 * ADDLIB command (ar script mode), in this case argv array possibly
265 * specifies the members ADDLIB want.
266 */
267 static void
read_objs(struct bsdar * bsdar,const char * archive,int checkargv)268 read_objs(struct bsdar *bsdar, const char *archive, int checkargv)
269 {
270 struct archive *a;
271 struct archive_entry *entry;
272 struct ar_obj *obj;
273 const char *name;
274 const char *bname;
275 char *buff;
276 char **av;
277 size_t size;
278 int i, r, find;
279
280 if ((a = archive_read_new()) == NULL)
281 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_read_new failed");
282 archive_read_support_format_ar(a);
283 AC(archive_read_open_filename(a, archive, DEF_BLKSZ));
284 for (;;) {
285 r = archive_read_next_header(a, &entry);
286 if (r == ARCHIVE_FATAL)
287 bsdar_errc(bsdar, EX_DATAERR, 0, "%s",
288 archive_error_string(a));
289 if (r == ARCHIVE_EOF)
290 break;
291 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY)
292 bsdar_warnc(bsdar, 0, "%s", archive_error_string(a));
293 if (r == ARCHIVE_RETRY) {
294 bsdar_warnc(bsdar, 0, "Retrying...");
295 continue;
296 }
297
298 name = archive_entry_pathname(entry);
299
300 /*
301 * skip pseudo members.
302 */
303 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0)
304 continue;
305
306 /*
307 * If checkargv is set, only read those members specified
308 * in argv.
309 */
310 if (checkargv && bsdar->argc > 0) {
311 find = 0;
312 for(i = 0; i < bsdar->argc; i++) {
313 av = &bsdar->argv[i];
314 if (*av == NULL)
315 continue;
316 if ((bname = basename(*av)) == NULL)
317 bsdar_errc(bsdar, EX_SOFTWARE, errno,
318 "basename failed");
319 if (strcmp(bname, name) != 0)
320 continue;
321
322 *av = NULL;
323 find = 1;
324 break;
325 }
326 if (!find)
327 continue;
328 }
329
330 size = archive_entry_size(entry);
331
332 if (size > 0) {
333 if ((buff = malloc(size)) == NULL)
334 bsdar_errc(bsdar, EX_SOFTWARE, errno,
335 "malloc failed");
336 if (archive_read_data(a, buff, size) != (ssize_t)size) {
337 bsdar_warnc(bsdar, 0, "%s",
338 archive_error_string(a));
339 free(buff);
340 continue;
341 }
342 } else
343 buff = NULL;
344
345 obj = malloc(sizeof(struct ar_obj));
346 if (obj == NULL)
347 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
348 obj->maddr = buff;
349 if ((obj->name = strdup(name)) == NULL)
350 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
351 obj->size = size;
352 obj->uid = archive_entry_uid(entry);
353 obj->gid = archive_entry_gid(entry);
354 obj->md = archive_entry_mode(entry);
355 obj->mtime = archive_entry_mtime(entry);
356 obj->dev = 0;
357 obj->ino = 0;
358
359 /*
360 * Objects from archive have obj->fd set to -1,
361 * for the ease of cleaning up.
362 */
363 obj->fd = -1;
364 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
365 }
366 AC(archive_read_close(a));
367 AC(archive_read_free(a));
368 }
369
370 /*
371 * Determine the constitution of resulting archive.
372 */
373 static void
write_archive(struct bsdar * bsdar,char mode)374 write_archive(struct bsdar *bsdar, char mode)
375 {
376 struct ar_obj *nobj, *obj, *obj_temp, *pos;
377 struct stat sb;
378 const char *bname;
379 char **av;
380 int i;
381
382 TAILQ_INIT(&bsdar->v_obj);
383 nobj = NULL;
384 pos = NULL;
385 memset(&sb, 0, sizeof(sb));
386
387 /*
388 * Test if the specified archive exists, to figure out
389 * whether we are creating one here.
390 */
391 if (stat(bsdar->filename, &sb) != 0) {
392 if (errno != ENOENT) {
393 bsdar_warnc(bsdar, 0, "stat %s failed",
394 bsdar->filename);
395 return;
396 }
397
398 /* We do not create archive in mode 'd', 'm' and 's'. */
399 if (mode != 'r' && mode != 'q') {
400 bsdar_warnc(bsdar, 0, "%s: no such file",
401 bsdar->filename);
402 return;
403 }
404
405 /* Issue a warning if -c is not specified when creating. */
406 if (!(bsdar->options & AR_C))
407 bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename);
408 goto new_archive;
409 }
410
411 /*
412 * First read members from existing archive.
413 */
414 read_objs(bsdar, bsdar->filename, 0);
415
416 /*
417 * For mode 's', no member will be moved, deleted or replaced.
418 */
419 if (mode == 's')
420 goto write_objs;
421
422 /*
423 * For mode 'q', we don't need to adjust existing members either.
424 * Also, -a, -b and -i are ignored in this mode. New members are
425 * always inserted at tail.
426 */
427 if (mode == 'q')
428 goto new_archive;
429
430 /*
431 * Mode 'A' adds the contents of another archive to the tail of
432 * current archive. Note that mode 'A' is a special mode for the
433 * ADDLIB command of the ar script mode. Currently there is no
434 * access to this function from the ar command line mode.
435 */
436 if (mode == 'A') {
437 /*
438 * Read objects from the target archive of ADDLIB command.
439 * If there are members specified in argv, read those members
440 * only, otherwise the entire archive will be read.
441 */
442 read_objs(bsdar, bsdar->addlib, 1);
443 goto write_objs;
444 }
445
446 /*
447 * Try to find the position member specified by user.
448 */
449 if (bsdar->options & AR_A || bsdar->options & AR_B) {
450 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
451 if (strcmp(obj->name, bsdar->posarg) == 0) {
452 pos = obj;
453 break;
454 }
455 }
456
457 /*
458 * If can't find `pos' specified by user,
459 * silently insert objects at tail.
460 */
461 if (pos == NULL)
462 bsdar->options &= ~(AR_A | AR_B);
463 }
464
465 for (i = 0; i < bsdar->argc; i++) {
466 av = &bsdar->argv[i];
467
468 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
469 if ((bname = basename(*av)) == NULL)
470 bsdar_errc(bsdar, EX_SOFTWARE, errno,
471 "basename failed");
472 if (bsdar->options & AR_TR) {
473 if (strncmp(bname, obj->name, _TRUNCATE_LEN))
474 continue;
475 } else
476 if (strcmp(bname, obj->name) != 0)
477 continue;
478
479 if (mode == 'r') {
480 /*
481 * if the new member is not qualified
482 * to replace the old one, skip it.
483 */
484 nobj = create_obj_from_file(bsdar, *av,
485 obj->mtime);
486 if (nobj == NULL)
487 goto skip_obj;
488 }
489
490 if (bsdar->options & AR_V)
491 (void)fprintf(stdout, "%c - %s\n", mode,
492 *av);
493
494 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
495 if (mode == 'd' || mode == 'r')
496 free_obj(bsdar, obj);
497
498 if (mode == 'm')
499 insert_obj(bsdar, obj, pos);
500 if (mode == 'r')
501 insert_obj(bsdar, nobj, pos);
502
503 skip_obj:
504 *av = NULL;
505 break;
506 }
507
508 }
509
510 new_archive:
511 /*
512 * When operating in mode 'r', directly add those user specified
513 * objects which do not exist in current archive. When operating
514 * in mode 'q', all objects specified in command line args are
515 * appended to the archive, without comparing with existing ones.
516 */
517 for (i = 0; i < bsdar->argc; i++) {
518 av = &bsdar->argv[i];
519 if (*av != NULL && (mode == 'r' || mode == 'q')) {
520 nobj = create_obj_from_file(bsdar, *av, 0);
521 if (nobj != NULL)
522 insert_obj(bsdar, nobj, pos);
523 if (bsdar->options & AR_V && nobj != NULL)
524 (void)fprintf(stdout, "a - %s\n", *av);
525 *av = NULL;
526 }
527 }
528
529 write_objs:
530 write_objs(bsdar);
531 write_cleanup(bsdar);
532 }
533
534 /*
535 * Memory cleaning up.
536 */
537 static void
write_cleanup(struct bsdar * bsdar)538 write_cleanup(struct bsdar *bsdar)
539 {
540 struct ar_obj *obj, *obj_temp;
541
542 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
543 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
544 free_obj(bsdar, obj);
545 }
546
547 free(bsdar->as);
548 free(bsdar->s_so);
549 free(bsdar->s_sn);
550 bsdar->as = NULL;
551 bsdar->s_so = NULL;
552 bsdar->s_sn = NULL;
553 }
554
555 /*
556 * Fault in the buffer prior to writing as a workaround for poor performance
557 * due to interaction with kernel fs deadlock avoidance code. See the comment
558 * above vn_io_fault_doio() in sys/kern/vfs_vnops.c for details of the issue.
559 */
560 static void
prefault_buffer(const char * buf,size_t s)561 prefault_buffer(const char *buf, size_t s)
562 {
563 volatile const char *p;
564 size_t page_size;
565
566 if (s == 0)
567 return;
568 page_size = sysconf(_SC_PAGESIZE);
569 for (p = buf; p < buf + s; p += page_size)
570 *p;
571 /*
572 * Ensure we touch the last page as well, in case the buffer is not
573 * page-aligned.
574 */
575 *(volatile const char *)(buf + s - 1);
576 }
577
578 /*
579 * Wrapper for archive_write_data().
580 */
581 static void
write_data(struct bsdar * bsdar,struct archive * a,const void * buf,size_t s)582 write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s)
583 {
584 prefault_buffer(buf, s);
585 if (archive_write_data(a, buf, s) != (ssize_t)s)
586 bsdar_errc(bsdar, EX_SOFTWARE, 0, "%s",
587 archive_error_string(a));
588 }
589
590 /*
591 * Write the resulting archive members.
592 */
593 static void
write_objs(struct bsdar * bsdar)594 write_objs(struct bsdar *bsdar)
595 {
596 struct ar_obj *obj;
597 struct archive *a;
598 struct archive_entry *entry;
599 size_t s_sz; /* size of archive symbol table. */
600 size_t pm_sz; /* size of pseudo members */
601 int i, nr;
602
603 if (elf_version(EV_CURRENT) == EV_NONE)
604 bsdar_errc(bsdar, EX_SOFTWARE, 0,
605 "ELF library initialization failed: %s", elf_errmsg(-1));
606
607 bsdar->rela_off = 0;
608
609 /* Create archive symbol table and archive string table, if need. */
610 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
611 if (!(bsdar->options & AR_SS) && obj->maddr != NULL)
612 create_symtab_entry(bsdar, obj->maddr, obj->size);
613 if (strlen(obj->name) > _MAXNAMELEN_SVR4)
614 add_to_ar_str_table(bsdar, obj->name);
615 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2;
616 }
617
618 /*
619 * Pad the symbol name string table. It is treated specially because
620 * symbol name table should be padded by a '\0', not the common '\n'
621 * for other members. The size of sn table includes the pad bit.
622 */
623 if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0)
624 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
625
626 /*
627 * Archive string table is padded by a "\n" as the normal members.
628 * The difference is that the size of archive string table counts
629 * in the pad bit, while normal members' size fileds do not.
630 */
631 if (bsdar->as != NULL && bsdar->as_sz % 2 != 0)
632 bsdar->as[bsdar->as_sz++] = '\n';
633
634 /*
635 * If there is a symbol table, calculate the size of pseudo members,
636 * convert previously stored relative offsets to absolute ones, and
637 * then make them Big Endian.
638 *
639 * absolute_offset = htobe32(relative_offset + size_of_pseudo_members)
640 */
641
642 if (bsdar->s_cnt != 0) {
643 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz;
644 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz);
645 if (bsdar->as != NULL)
646 pm_sz += _ARHDR_LEN + bsdar->as_sz;
647 for (i = 0; (size_t)i < bsdar->s_cnt; i++)
648 *(bsdar->s_so + i) = htobe32(*(bsdar->s_so + i) +
649 pm_sz);
650 }
651
652 if ((a = archive_write_new()) == NULL)
653 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_write_new failed");
654
655 archive_write_set_format_ar_svr4(a);
656
657 AC(archive_write_open_filename(a, bsdar->filename));
658
659 /*
660 * write the archive symbol table, if there is one.
661 * If options -s is explicitly specified or we are invoked
662 * as ranlib, write the symbol table even if it is empty.
663 */
664 if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) ||
665 bsdar->options & AR_S) {
666 entry = archive_entry_new();
667 if (entry == NULL)
668 bsdar_errc(bsdar, EX_SOFTWARE, 0,
669 "archive_entry_new failed");
670 archive_entry_copy_pathname(entry, "/");
671 if ((bsdar->options & AR_D) == 0)
672 archive_entry_set_mtime(entry, time(NULL), 0);
673 archive_entry_set_size(entry, (bsdar->s_cnt + 1) *
674 sizeof(uint32_t) + bsdar->s_sn_sz);
675 AC(archive_write_header(a, entry));
676 nr = htobe32(bsdar->s_cnt);
677 write_data(bsdar, a, &nr, sizeof(uint32_t));
678 write_data(bsdar, a, bsdar->s_so, sizeof(uint32_t) *
679 bsdar->s_cnt);
680 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
681 archive_entry_free(entry);
682 }
683
684 /* write the archive string table, if any. */
685 if (bsdar->as != NULL) {
686 entry = archive_entry_new();
687 if (entry == NULL)
688 bsdar_errc(bsdar, EX_SOFTWARE, 0,
689 "archive_entry_new failed");
690 archive_entry_copy_pathname(entry, "//");
691 archive_entry_set_size(entry, bsdar->as_sz);
692 AC(archive_write_header(a, entry));
693 write_data(bsdar, a, bsdar->as, bsdar->as_sz);
694 archive_entry_free(entry);
695 }
696
697 /* write normal members. */
698 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
699 entry = archive_entry_new();
700 if (entry == NULL)
701 bsdar_errc(bsdar, EX_SOFTWARE, 0,
702 "archive_entry_new failed");
703 archive_entry_copy_pathname(entry, obj->name);
704 archive_entry_set_uid(entry, obj->uid);
705 archive_entry_set_gid(entry, obj->gid);
706 archive_entry_set_mode(entry, obj->md);
707 archive_entry_set_size(entry, obj->size);
708 archive_entry_set_mtime(entry, obj->mtime, 0);
709 archive_entry_set_dev(entry, obj->dev);
710 archive_entry_set_ino(entry, obj->ino);
711 archive_entry_set_filetype(entry, AE_IFREG);
712 AC(archive_write_header(a, entry));
713 write_data(bsdar, a, obj->maddr, obj->size);
714 archive_entry_free(entry);
715 }
716
717 AC(archive_write_close(a));
718 AC(archive_write_free(a));
719 }
720
721 /*
722 * Extract global symbols from ELF binary members.
723 */
724 static void
create_symtab_entry(struct bsdar * bsdar,void * maddr,size_t size)725 create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size)
726 {
727 Elf *e;
728 Elf_Scn *scn;
729 GElf_Shdr shdr;
730 GElf_Sym sym;
731 Elf_Data *data;
732 char *name;
733 size_t n, shstrndx;
734 int elferr, tabndx, len, i;
735
736 if ((e = elf_memory(maddr, size)) == NULL) {
737 bsdar_warnc(bsdar, 0, "elf_memory() failed: %s",
738 elf_errmsg(-1));
739 return;
740 }
741 if (elf_kind(e) != ELF_K_ELF) {
742 /* Silently ignore non-elf member. */
743 elf_end(e);
744 return;
745 }
746 if (elf_getshstrndx(e, &shstrndx) == 0) {
747 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_getshstrndx failed: %s",
748 elf_errmsg(-1));
749 elf_end(e);
750 return;
751 }
752
753 tabndx = -1;
754 scn = NULL;
755 while ((scn = elf_nextscn(e, scn)) != NULL) {
756 if (gelf_getshdr(scn, &shdr) != &shdr) {
757 bsdar_warnc(bsdar, 0,
758 "elf_getshdr failed: %s", elf_errmsg(-1));
759 continue;
760 }
761 if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) {
762 bsdar_warnc(bsdar, 0,
763 "elf_strptr failed: %s", elf_errmsg(-1));
764 continue;
765 }
766 if (strcmp(name, ".strtab") == 0) {
767 tabndx = elf_ndxscn(scn);
768 break;
769 }
770 }
771 elferr = elf_errno();
772 if (elferr != 0)
773 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
774 elf_errmsg(elferr));
775 if (tabndx == -1) {
776 bsdar_warnc(bsdar, 0, "can't find .strtab section");
777 elf_end(e);
778 return;
779 }
780
781 scn = NULL;
782 while ((scn = elf_nextscn(e, scn)) != NULL) {
783 if (gelf_getshdr(scn, &shdr) != &shdr) {
784 bsdar_warnc(bsdar, EX_SOFTWARE, 0,
785 "elf_getshdr failed: %s", elf_errmsg(-1));
786 continue;
787 }
788 if (shdr.sh_type != SHT_SYMTAB)
789 continue;
790
791 data = NULL;
792 n = 0;
793 while (n < shdr.sh_size &&
794 (data = elf_getdata(scn, data)) != NULL) {
795 len = data->d_size / shdr.sh_entsize;
796 for (i = 0; i < len; i++) {
797 if (gelf_getsym(data, i, &sym) != &sym) {
798 bsdar_warnc(bsdar, EX_SOFTWARE, 0,
799 "gelf_getsym failed: %s",
800 elf_errmsg(-1));
801 continue;
802 }
803
804 /* keep only global or weak symbols */
805 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL &&
806 GELF_ST_BIND(sym.st_info) != STB_WEAK)
807 continue;
808
809 /* keep only defined symbols */
810 if (sym.st_shndx == SHN_UNDEF)
811 continue;
812
813 if ((name = elf_strptr(e, tabndx,
814 sym.st_name)) == NULL) {
815 bsdar_warnc(bsdar, EX_SOFTWARE, 0,
816 "elf_strptr failed: %s",
817 elf_errmsg(-1));
818 continue;
819 }
820
821 add_to_ar_sym_table(bsdar, name);
822 }
823 }
824 }
825 elferr = elf_errno();
826 if (elferr != 0)
827 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_nextscn failed: %s",
828 elf_errmsg(elferr));
829
830 elf_end(e);
831 }
832
833 /*
834 * Append to the archive string table buffer.
835 */
836 static void
add_to_ar_str_table(struct bsdar * bsdar,const char * name)837 add_to_ar_str_table(struct bsdar *bsdar, const char *name)
838 {
839
840 if (bsdar->as == NULL) {
841 bsdar->as_cap = _INIT_AS_CAP;
842 bsdar->as_sz = 0;
843 if ((bsdar->as = malloc(bsdar->as_cap)) == NULL)
844 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
845 }
846
847 /*
848 * The space required for holding one member name in as table includes:
849 * strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding).
850 */
851 while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) {
852 bsdar->as_cap *= 2;
853 bsdar->as = realloc(bsdar->as, bsdar->as_cap);
854 if (bsdar->as == NULL)
855 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
856 }
857 strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name));
858 bsdar->as_sz += strlen(name);
859 bsdar->as[bsdar->as_sz++] = '/';
860 bsdar->as[bsdar->as_sz++] = '\n';
861 }
862
863 /*
864 * Append to the archive symbol table buffer.
865 */
866 static void
add_to_ar_sym_table(struct bsdar * bsdar,const char * name)867 add_to_ar_sym_table(struct bsdar *bsdar, const char *name)
868 {
869
870 if (bsdar->s_so == NULL) {
871 if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) ==
872 NULL)
873 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
874 bsdar->s_so_cap = _INIT_SYMOFF_CAP;
875 bsdar->s_cnt = 0;
876 }
877
878 if (bsdar->s_sn == NULL) {
879 if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL)
880 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
881 bsdar->s_sn_cap = _INIT_SYMNAME_CAP;
882 bsdar->s_sn_sz = 0;
883 }
884
885 if (bsdar->s_cnt * sizeof(uint32_t) >= bsdar->s_so_cap) {
886 bsdar->s_so_cap *= 2;
887 bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap);
888 if (bsdar->s_so == NULL)
889 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
890 }
891 bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off;
892 bsdar->s_cnt++;
893
894 /*
895 * The space required for holding one symbol name in sn table includes:
896 * strlen(name) + (1 for '\n') + (possibly 1 for padding).
897 */
898 while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) {
899 bsdar->s_sn_cap *= 2;
900 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap);
901 if (bsdar->s_sn == NULL)
902 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
903 }
904 strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name));
905 bsdar->s_sn_sz += strlen(name);
906 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
907 }
908