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/queue.h>
28 #include <sys/stat.h>
29
30 #include <archive.h>
31 #include <archive_entry.h>
32 #include <assert.h>
33 #include <errno.h>
34 #include <fcntl.h>
35 #include <gelf.h>
36 #include <libgen.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40
41 #include "ar.h"
42
43 ELFTC_VCSID("$Id: write.c 3183 2015-04-10 16:18:42Z emaste $");
44
45 #define _ARMAG_LEN 8 /* length of the magic string */
46 #define _ARHDR_LEN 60 /* length of the archive header */
47 #define _INIT_AS_CAP 128 /* initial archive string table size */
48 #define _INIT_SYMOFF_CAP (256*(sizeof(uint32_t))) /* initial so table size */
49 #define _INIT_SYMNAME_CAP 1024 /* initial sn table size */
50 #define _MAXNAMELEN_SVR4 15 /* max member name length in svr4 variant */
51 #define _MAXNAMELEN_BSD 16 /* max member name length in bsd variant */
52 #define _TRUNCATE_LEN 15 /* number of bytes to keep for member name */
53
54 static void add_to_ar_str_table(struct bsdar *bsdar, const char *name);
55 static void add_to_ar_sym_table(struct bsdar *bsdar, const char *name);
56 static struct ar_obj *create_obj_from_file(struct bsdar *bsdar,
57 const char *name, time_t mtime);
58 static void create_symtab_entry(struct bsdar *bsdar, Elf *e);
59 static void free_obj(struct ar_obj *obj);
60 static void insert_obj(struct bsdar *bsdar, struct ar_obj *obj,
61 struct ar_obj *pos);
62 static void read_objs(struct bsdar *bsdar, const char *archive,
63 int checkargv);
64 static void write_cleanup(struct bsdar *bsdar);
65 static void write_data(struct bsdar *bsdar, struct archive *a,
66 const void *buf, size_t s);
67 static void write_objs(struct bsdar *bsdar);
68
69 /*
70 * Create an object from a file, and return the created object
71 * descriptor. Return NULL if either an error occurs, or if the '-u'
72 * option was specified and the member is not newer than the existing
73 * one in the archive.
74 */
75 static struct ar_obj *
create_obj_from_file(struct bsdar * bsdar,const char * name,time_t mtime)76 create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime)
77 {
78 struct ar_obj *obj;
79 struct stat sb;
80 const char *bname;
81 char *tmpname;
82 int fd;
83
84 if (name == NULL)
85 return (NULL);
86
87 obj = malloc(sizeof(struct ar_obj));
88 if (obj == NULL)
89 bsdar_errc(bsdar, errno, "malloc failed");
90
91 obj->elf = NULL;
92
93 if ((fd = open(name, O_RDONLY, 0)) < 0) {
94 bsdar_warnc(bsdar, errno, "can't open file: %s", name);
95 free(obj);
96 return (NULL);
97 }
98
99 tmpname = strdup(name);
100 if ((bname = basename(tmpname)) == NULL)
101 bsdar_errc(bsdar, errno, "basename failed");
102 if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) {
103 if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL)
104 bsdar_errc(bsdar, errno, "malloc failed");
105 (void)strncpy(obj->name, bname, _TRUNCATE_LEN);
106 obj->name[_TRUNCATE_LEN] = '\0';
107 } else
108 if ((obj->name = strdup(bname)) == NULL)
109 bsdar_errc(bsdar, errno, "strdup failed");
110 free(tmpname);
111
112 if (fstat(fd, &sb) < 0) {
113 bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name);
114 goto giveup;
115 }
116 if (!S_ISREG(sb.st_mode)) {
117 bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name);
118 goto giveup;
119 }
120
121 if (sb.st_dev == bsdar->ar_dev && sb.st_ino == bsdar->ar_ino) {
122 bsdar_warnc(bsdar, 0, "cannot add archive \"%s\" to itself",
123 obj->name);
124 goto giveup;
125 }
126
127 /*
128 * If the '-u' option is specified and member is not newer
129 * than the existing one, we should not replace the member.
130 * However, if mtime == 0, i.e., if nonexistent members are to
131 * be forcibly replaced, then the '-u' option is to be ignored.
132 */
133 if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime)
134 goto giveup;
135
136 /*
137 * When the '-D' option is specified, the mtime and UID/GID of
138 * the member will be set to 0, and the file mode will be set
139 * to 644. This ensures that checksums will match for two
140 * archives containing identical content.
141 */
142 if (bsdar->options & AR_D) {
143 obj->uid = 0;
144 obj->gid = 0;
145 obj->mtime = 0;
146 obj->md = S_IFREG | 0644;
147 } else {
148 obj->uid = sb.st_uid;
149 obj->gid = sb.st_gid;
150 obj->mtime = sb.st_mtime;
151 obj->md = sb.st_mode;
152 }
153 obj->size = sb.st_size;
154 obj->dev = sb.st_dev;
155 obj->ino = sb.st_ino;
156
157 if (obj->size == 0) {
158 return (obj);
159 }
160
161 if ((obj->elf = elf_open(fd)) == NULL) {
162 bsdar_warnc(bsdar, 0, "file initialization failed for %s: %s",
163 obj->name, elf_errmsg(-1));
164 goto giveup;
165 }
166
167 /*
168 * Read the object fully into memory and close its file
169 * descriptor.
170 */
171 if (elf_cntl(obj->elf, ELF_C_FDREAD) < 0) {
172 bsdar_warnc(bsdar, 0, "%s could not be read in: %s",
173 obj->name, elf_errmsg(-1));
174 goto giveup;
175 }
176
177 if (close(fd) < 0)
178 bsdar_errc(bsdar, errno, "close failed: %s",
179 obj->name);
180
181 return (obj);
182
183 giveup:
184 if (obj->elf)
185 elf_end(obj->elf);
186
187 if (close(fd) < 0)
188 bsdar_errc(bsdar, errno, "close failed: %s",
189 obj->name);
190 free(obj->name);
191 free(obj);
192 return (NULL);
193 }
194
195 /*
196 * Free an object and its associated allocations.
197 */
198 static void
free_obj(struct ar_obj * obj)199 free_obj(struct ar_obj *obj)
200 {
201 if (obj->elf)
202 elf_end(obj->elf);
203
204 free(obj->name);
205 free(obj);
206 }
207
208 /*
209 * Insert an object into a list, either before/after the 'pos' obj or
210 * at the end of the list.
211 */
212 static void
insert_obj(struct bsdar * bsdar,struct ar_obj * obj,struct ar_obj * pos)213 insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos)
214 {
215 if (obj == NULL)
216 bsdar_errc(bsdar, 0, "try to insert a null obj");
217
218 if (pos == NULL || obj == pos)
219 /*
220 * If the object to move happens to be the position
221 * obj, or if there is no position obj, move the
222 * object to the end.
223 */
224 goto tail;
225
226 if (bsdar->options & AR_B) {
227 TAILQ_INSERT_BEFORE(pos, obj, objs);
228 return;
229 }
230 if (bsdar->options & AR_A) {
231 TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs);
232 return;
233 }
234
235 tail:
236 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
237
238 }
239
240 /*
241 * Read objects from archive into the 'v_obj' list. Note that
242 * 'checkargv' is set when read_objs() is used to read objects from
243 * the target of 'ADDLIB' command in ar script mode; in this case the
244 * 'argv' array specifies the members that 'ADDLIB' is to operate on.
245 */
246 static void
read_objs(struct bsdar * bsdar,const char * archive,int checkargv)247 read_objs(struct bsdar *bsdar, const char *archive, int checkargv)
248 {
249 struct archive *a;
250 struct archive_entry *entry;
251 struct ar_obj *obj;
252 const char *name;
253 const char *bname;
254 char *buff;
255 char **av;
256 size_t size;
257 int i, r, find;
258
259 if ((a = archive_read_new()) == NULL)
260 bsdar_errc(bsdar, 0, "archive_read_new failed");
261 archive_read_support_format_ar(a);
262 AC(archive_read_open_filename(a, archive, DEF_BLKSZ));
263 for (;;) {
264 r = archive_read_next_header(a, &entry);
265 if (r == ARCHIVE_FATAL)
266 bsdar_errc(bsdar, 0, "%s", archive_error_string(a));
267 if (r == ARCHIVE_EOF)
268 break;
269 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY)
270 bsdar_warnc(bsdar, 0, "%s", archive_error_string(a));
271 if (r == ARCHIVE_RETRY) {
272 bsdar_warnc(bsdar, 0, "Retrying...");
273 continue;
274 }
275
276 name = archive_entry_pathname(entry);
277
278 /*
279 * Skip pseudo members.
280 */
281 if (bsdar_is_pseudomember(bsdar, name))
282 continue;
283
284 /*
285 * If 'checkargv' is set, only read those members
286 * specified in argv.
287 */
288 if (checkargv && bsdar->argc > 0) {
289 find = 0;
290 for(i = 0; i < bsdar->argc; i++) {
291 av = &bsdar->argv[i];
292 if (*av == NULL)
293 continue;
294 if ((bname = basename(*av)) == NULL)
295 bsdar_errc(bsdar, errno,
296 "basename failed");
297 if (strcmp(bname, name) != 0)
298 continue;
299
300 *av = NULL;
301 find = 1;
302 break;
303 }
304 if (!find)
305 continue;
306 }
307
308 size = archive_entry_size(entry);
309
310 if (size > 0) {
311 if ((buff = malloc(size)) == NULL)
312 bsdar_errc(bsdar, errno, "malloc failed");
313 if (archive_read_data(a, buff, size) != (ssize_t)size) {
314 bsdar_warnc(bsdar, 0, "%s",
315 archive_error_string(a));
316 free(buff);
317 continue;
318 }
319 } else
320 buff = NULL;
321
322 obj = malloc(sizeof(struct ar_obj));
323 if (obj == NULL)
324 bsdar_errc(bsdar, errno, "malloc failed");
325 obj->elf = NULL;
326 if (buff) {
327 obj->elf = elf_openmemory(buff, size);
328 if (obj->elf == NULL) {
329 bsdar_warnc(bsdar, 0, "elf_openmemory() "
330 "failed for %s: %s", name,
331 elf_errmsg(-1));
332 free(buff);
333 free(obj);
334 continue;
335 }
336 }
337 if ((obj->name = strdup(name)) == NULL)
338 bsdar_errc(bsdar, errno, "strdup failed");
339 obj->size = size;
340 obj->uid = archive_entry_uid(entry);
341 obj->gid = archive_entry_gid(entry);
342 obj->md = archive_entry_mode(entry);
343 obj->mtime = archive_entry_mtime(entry);
344 obj->dev = 0;
345 obj->ino = 0;
346
347 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
348 }
349 AC(archive_read_close(a));
350 ACV(archive_read_free(a));
351 }
352
353 /*
354 * Write an archive.
355 */
356 void
ar_write_archive(struct bsdar * bsdar,int mode)357 ar_write_archive(struct bsdar *bsdar, int mode)
358 {
359 struct ar_obj *nobj, *obj, *obj_temp, *pos;
360 struct stat sb;
361 const char *bname;
362 char **av;
363 int i;
364
365 TAILQ_INIT(&bsdar->v_obj);
366 nobj = NULL;
367 pos = NULL;
368 memset(&sb, 0, sizeof(sb));
369
370 assert(mode == 'A' || mode == 'd' || mode == 'm' || mode == 'q' ||
371 mode == 'r' || mode == 's');
372
373 /*
374 * Test if the specified archive exists, to determine
375 * whether we are creating a new archive.
376 */
377 if (stat(bsdar->filename, &sb) != 0) {
378 if (errno != ENOENT) {
379 bsdar_warnc(bsdar, 0, "stat %s failed",
380 bsdar->filename);
381 return;
382 }
383
384 /* We do not create archive in mode 'd', 'm' and 's'. */
385 if (mode != 'r' && mode != 'q') {
386 bsdar_warnc(bsdar, 0, "%s: no such file",
387 bsdar->filename);
388 return;
389 }
390
391 /* Issue a message if the '-c' option was not specified. */
392 if (!(bsdar->options & AR_C))
393 bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename);
394 goto new_archive;
395 }
396
397 bsdar->ar_dev = sb.st_dev;
398 bsdar->ar_ino = sb.st_ino;
399
400 /*
401 * First read members from the existing archive.
402 */
403 read_objs(bsdar, bsdar->filename, 0);
404
405 /*
406 * For mode 's', no member will be moved, deleted or replaced.
407 */
408 if (mode == 's')
409 goto write_objs;
410
411 /*
412 * For mode 'q', we don't need to adjust existing members either.
413 * Also, -a, -b and -i are ignored in this mode. New members are
414 * always inserted at tail.
415 */
416 if (mode == 'q')
417 goto new_archive;
418
419 /*
420 * Mode 'A' adds the contents of another archive to the tail
421 * of current archive. Note that mode 'A' is a special mode
422 * for the 'ADDLIB' command in ar's script mode. Currently
423 * there is no option that invokes this function from ar's
424 * command line.
425 */
426 if (mode == 'A') {
427 /*
428 * Read objects from the target archive of the
429 * 'ADDLIB' command. If there are members specified in
430 * 'argv', read those members only, otherwise the
431 * entire archive will be read.
432 */
433 read_objs(bsdar, bsdar->addlib, 1);
434 goto write_objs;
435 }
436
437 /*
438 * Try to find the position member specified by user.
439 */
440 if (bsdar->options & AR_A || bsdar->options & AR_B) {
441 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
442 if (strcmp(obj->name, bsdar->posarg) == 0) {
443 pos = obj;
444 break;
445 }
446 }
447
448 /*
449 * If we cannot find the position specified by the
450 * user, silently insert objects at the tail of the
451 * list.
452 */
453 if (pos == NULL)
454 bsdar->options &= ~(AR_A | AR_B);
455 }
456
457 for (i = 0; i < bsdar->argc; i++) {
458 av = &bsdar->argv[i];
459
460 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
461 if ((bname = basename(*av)) == NULL)
462 bsdar_errc(bsdar, errno, "basename failed");
463 if (bsdar->options & AR_TR) {
464 if (strncmp(bname, obj->name, _TRUNCATE_LEN))
465 continue;
466 } else
467 if (strcmp(bname, obj->name) != 0)
468 continue;
469
470 if (mode == 'r') {
471 /*
472 * If the new member should not
473 * replace the old one, skip it.
474 */
475 nobj = create_obj_from_file(bsdar, *av,
476 obj->mtime);
477 if (nobj == NULL)
478 goto skip_obj;
479 }
480
481 if (bsdar->options & AR_V)
482 (void)fprintf(bsdar->output, "%c - %s\n",
483 mode, *av);
484
485 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
486 if (mode == 'd' || mode == 'r')
487 free_obj(obj);
488
489 if (mode == 'm')
490 insert_obj(bsdar, obj, pos);
491 if (mode == 'r')
492 insert_obj(bsdar, nobj, pos);
493
494 skip_obj:
495 *av = NULL;
496 break;
497 }
498
499 }
500
501 new_archive:
502 /*
503 * When operating in mode 'r', directly add the specified
504 * objects which do not exist in current archive. When
505 * operating in mode 'q', all objects specified by the command
506 * line args are appended to the archive, without checking
507 * existing members in the archive.
508 */
509 for (i = 0; i < bsdar->argc; i++) {
510 av = &bsdar->argv[i];
511 if (*av != NULL && (mode == 'r' || mode == 'q')) {
512 nobj = create_obj_from_file(bsdar, *av, 0);
513 if (nobj != NULL)
514 insert_obj(bsdar, nobj, pos);
515 if (bsdar->options & AR_V && nobj != NULL)
516 (void)fprintf(bsdar->output, "a - %s\n", *av);
517 *av = NULL;
518 }
519 }
520
521 write_objs:
522 write_objs(bsdar);
523 write_cleanup(bsdar);
524 }
525
526 /*
527 * Release memory.
528 */
529 static void
write_cleanup(struct bsdar * bsdar)530 write_cleanup(struct bsdar *bsdar)
531 {
532 struct ar_obj *obj, *obj_temp;
533
534 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
535 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
536 free_obj(obj);
537 }
538
539 free(bsdar->as);
540 free(bsdar->s_so);
541 free(bsdar->s_sn);
542 bsdar->as = NULL;
543 bsdar->s_so = NULL;
544 bsdar->s_sn = NULL;
545 }
546
547 /*
548 * Wrapper for archive_write_data().
549 */
550 static void
write_data(struct bsdar * bsdar,struct archive * a,const void * buf,size_t s)551 write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s)
552 {
553 if (archive_write_data(a, buf, s) != (ssize_t)s)
554 bsdar_errc(bsdar, 0, "%s", archive_error_string(a));
555 }
556
557 /*
558 * Compute the size of the symbol table for an archive.
559 */
560 static size_t
bsdar_symtab_size(struct bsdar * bsdar)561 bsdar_symtab_size(struct bsdar *bsdar)
562 {
563 size_t sz;
564
565 if (bsdar->options & AR_BSD) {
566 /*
567 * A BSD style symbol table has two parts.
568 * Each part is preceded by its size in bytes,
569 * encoded as a C 'long'. In the first part,
570 * there are 's_cnt' entries, each entry being
571 * 2 'long's in size. The second part
572 * contains a string table.
573 */
574 sz = 2 * sizeof(long) + (bsdar->s_cnt * 2 * sizeof(long)) +
575 bsdar->s_sn_sz;
576 } else {
577 /*
578 * An SVR4 style symbol table comprises of a 32 bit
579 * number holding the number of entries, followed by
580 * that many 32-bit offsets, followed by a string
581 * table.
582 */
583 sz = sizeof(uint32_t) + bsdar->s_cnt * sizeof(uint32_t) +
584 bsdar->s_sn_sz;
585 }
586
587 return (sz);
588 }
589
590 static void
write_svr4_symtab_entry(struct bsdar * bsdar,struct archive * a)591 write_svr4_symtab_entry(struct bsdar *bsdar, struct archive *a)
592 {
593 int nr;
594 uint32_t i;
595
596 /* Translate offsets to big-endian form. */
597 for (i = 0; i < bsdar->s_cnt; i++)
598 bsdar->s_so[i] = htobe32(bsdar->s_so[i]);
599
600 nr = htobe32(bsdar->s_cnt);
601 write_data(bsdar, a, &nr, sizeof(uint32_t));
602 write_data(bsdar, a, bsdar->s_so, sizeof(uint32_t) *
603 bsdar->s_cnt);
604 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
605 }
606
607 static void
write_bsd_symtab_entry(struct bsdar * bsdar,struct archive * a)608 write_bsd_symtab_entry(struct bsdar *bsdar, struct archive *a)
609 {
610 long br_sz, br_off, br_strx;
611 char *s;
612 uint32_t i;
613
614 /*
615 * Write out the size in the byte of the array of 'ranlib'
616 * descriptors to follow.
617 */
618
619 br_sz = (long) (bsdar->s_cnt * 2 * sizeof(long));
620 write_data(bsdar, a, &br_sz, sizeof(long));
621
622 /*
623 * Write out the array of 'ranlib' descriptors. Each
624 * descriptor comprises of (a) an offset into the following
625 * string table and (b) a file offset to the relevant member.
626 */
627 for (i = 0, s = bsdar->s_sn; i < bsdar->s_cnt; i++) {
628 br_strx = (long) (s - bsdar->s_sn);
629 br_off = (long) bsdar->s_so[i];
630 write_data(bsdar, a, &br_strx, sizeof(long));
631 write_data(bsdar, a, &br_off, sizeof(long));
632
633 /* Find the start of the next symbol in the string table. */
634 while (*s++ != '\0')
635 ;
636 }
637
638 /*
639 * Write out the size of the string table as a 'long',
640 * followed by the string table itself.
641 */
642 br_sz = (long) bsdar->s_sn_sz;
643 write_data(bsdar, a, &br_sz, sizeof(long));
644 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
645 }
646
647
648 /*
649 * Write the resulting archive members.
650 */
651 static void
write_objs(struct bsdar * bsdar)652 write_objs(struct bsdar *bsdar)
653 {
654 struct ar_obj *obj;
655 struct archive *a;
656 struct archive_entry *entry;
657 size_t s_sz; /* size of archive symbol table. */
658 size_t pm_sz; /* size of pseudo members */
659 size_t namelen; /* size of member name. */
660 size_t obj_sz; /* size of object + extended header. */
661 int i;
662 char *buf;
663 const char *entry_name;
664
665 bsdar->rela_off = 0;
666
667 /*
668 * Create the archive symbol table and the archive string
669 * table, if needed.
670 */
671 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
672 if (!(bsdar->options & AR_SS) && obj->elf != NULL)
673 create_symtab_entry(bsdar, obj->elf);
674
675 obj_sz = 0;
676 namelen = strlen(obj->name);
677 if (bsdar->options & AR_BSD) {
678 /* Account for the space used by the file name. */
679 if (namelen > _MAXNAMELEN_BSD ||
680 strchr(obj->name, ' '))
681 obj_sz += namelen;
682 } else if (namelen > _MAXNAMELEN_SVR4)
683 add_to_ar_str_table(bsdar, obj->name);
684
685 obj_sz += obj->size; /* add the actual object size */
686
687 /* Roundup the final size and add the header length. */
688 bsdar->rela_off += _ARHDR_LEN + obj_sz + (obj_sz & 1);
689 }
690
691 /*
692 * Pad the symbol name string table. It is treated specially
693 * because symbol name table should be padded by a '\0', and
694 * not '\n' as for normal members. The size of the 'sn' table
695 * includes the pad byte.
696 */
697 if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0)
698 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
699
700 /*
701 * The archive string table is padded by a "\n" like a normal
702 * member. The difference is that the size of archive string
703 * table includes the pad byte, while normal members' size
704 * fields do not.
705 */
706 if (bsdar->as != NULL && bsdar->as_sz % 2 != 0)
707 bsdar->as[bsdar->as_sz++] = '\n';
708
709 /*
710 * If there is a symbol table, calculate the size of pseudo
711 * members, and convert previously stored relative offsets to
712 * absolute ones.
713 *
714 * absolute_offset = relative_offset + size_of_pseudo_members)
715 */
716
717 s_sz = bsdar_symtab_size(bsdar);
718 if (bsdar->s_cnt != 0) {
719 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz);
720 if (bsdar->as != NULL) /* SVR4 archives only */
721 pm_sz += _ARHDR_LEN + bsdar->as_sz;
722 for (i = 0; (size_t) i < bsdar->s_cnt; i++)
723 bsdar->s_so[i] = bsdar->s_so[i] + pm_sz;
724 }
725
726 if ((a = archive_write_new()) == NULL)
727 bsdar_errc(bsdar, 0, "archive_write_new failed");
728
729 if (bsdar->options & AR_BSD)
730 archive_write_set_format_ar_bsd(a);
731 else
732 archive_write_set_format_ar_svr4(a);
733
734 AC(archive_write_open_filename(a, bsdar->filename));
735
736 /*
737 * Write the archive symbol table, if there is one. If
738 * options '-s' was explicitly specified or if we were invoked
739 * as 'ranlib', write the symbol table even if it is empty.
740 */
741 if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) ||
742 bsdar->options & AR_S) {
743 if (bsdar->options & AR_BSD)
744 entry_name = AR_SYMTAB_NAME_BSD;
745 else
746 entry_name = AR_SYMTAB_NAME_SVR4;
747
748 entry = archive_entry_new();
749 archive_entry_copy_pathname(entry, entry_name);
750 if ((bsdar->options & AR_D) == 0)
751 archive_entry_set_mtime(entry, time(NULL), 0);
752 archive_entry_set_size(entry, s_sz);
753 AC(archive_write_header(a, entry));
754 if (bsdar->options & AR_BSD)
755 write_bsd_symtab_entry(bsdar, a);
756 else
757 write_svr4_symtab_entry(bsdar, a);
758 archive_entry_free(entry);
759 }
760
761 /* Write the archive string table, if any. */
762 if (bsdar->as != NULL) {
763 entry = archive_entry_new();
764 archive_entry_copy_pathname(entry, AR_STRINGTAB_NAME_SVR4);
765 archive_entry_set_size(entry, bsdar->as_sz);
766 AC(archive_write_header(a, entry));
767 write_data(bsdar, a, bsdar->as, bsdar->as_sz);
768 archive_entry_free(entry);
769 }
770
771 /* Write normal members. */
772 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
773 if ((buf = elf_rawfile(obj->elf, NULL)) == NULL) {
774 bsdar_warnc(bsdar, 0, "elf_rawfile() failed: %s",
775 elf_errmsg(-1));
776 continue;
777 }
778
779 entry = archive_entry_new();
780 archive_entry_copy_pathname(entry, obj->name);
781 archive_entry_set_uid(entry, obj->uid);
782 archive_entry_set_gid(entry, obj->gid);
783 archive_entry_set_mode(entry, obj->md);
784 archive_entry_set_size(entry, obj->size);
785 archive_entry_set_mtime(entry, obj->mtime, 0);
786 archive_entry_set_dev(entry, obj->dev);
787 archive_entry_set_ino(entry, obj->ino);
788 archive_entry_set_filetype(entry, AE_IFREG);
789 AC(archive_write_header(a, entry));
790 write_data(bsdar, a, buf, obj->size);
791 archive_entry_free(entry);
792 }
793
794 AC(archive_write_close(a));
795 ACV(archive_write_free(a));
796 }
797
798 /*
799 * Extract global symbols from ELF binary members.
800 */
801 static void
create_symtab_entry(struct bsdar * bsdar,Elf * e)802 create_symtab_entry(struct bsdar *bsdar, Elf *e)
803 {
804 Elf_Scn *scn;
805 GElf_Shdr shdr;
806 GElf_Sym sym;
807 Elf_Data *data;
808 char *name;
809 size_t n, shstrndx;
810 int elferr, tabndx, len, i;
811
812 if (elf_kind(e) != ELF_K_ELF) {
813 /* Silently a ignore non-ELF member. */
814 return;
815 }
816 if (elf_getshstrndx(e, &shstrndx) == 0) {
817 bsdar_warnc(bsdar, 0, "elf_getshstrndx failed: %s",
818 elf_errmsg(-1));
819 return;
820 }
821
822 tabndx = -1;
823 scn = NULL;
824 while ((scn = elf_nextscn(e, scn)) != NULL) {
825 if (gelf_getshdr(scn, &shdr) != &shdr) {
826 bsdar_warnc(bsdar, 0,
827 "elf_getshdr failed: %s", elf_errmsg(-1));
828 continue;
829 }
830 if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) {
831 bsdar_warnc(bsdar, 0,
832 "elf_strptr failed: %s", elf_errmsg(-1));
833 continue;
834 }
835 if (strcmp(name, ".strtab") == 0) {
836 tabndx = elf_ndxscn(scn);
837 break;
838 }
839 }
840 elferr = elf_errno();
841 if (elferr != 0)
842 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
843 elf_errmsg(elferr));
844 if (tabndx == -1) {
845 bsdar_warnc(bsdar, 0, "can't find .strtab section");
846 return;
847 }
848
849 scn = NULL;
850 while ((scn = elf_nextscn(e, scn)) != NULL) {
851 if (gelf_getshdr(scn, &shdr) != &shdr) {
852 bsdar_warnc(bsdar, 0, "elf_getshdr failed: %s",
853 elf_errmsg(-1));
854 continue;
855 }
856 if (shdr.sh_type != SHT_SYMTAB)
857 continue;
858
859 data = NULL;
860 n = 0;
861 while (n < shdr.sh_size &&
862 (data = elf_getdata(scn, data)) != NULL) {
863 len = data->d_size / shdr.sh_entsize;
864 for (i = 0; i < len; i++) {
865 if (gelf_getsym(data, i, &sym) != &sym) {
866 bsdar_warnc(bsdar, 0,
867 "gelf_getsym failed: %s",
868 elf_errmsg(-1));
869 continue;
870 }
871
872 /* Keep only global and weak symbols. */
873 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL &&
874 GELF_ST_BIND(sym.st_info) != STB_WEAK)
875 continue;
876
877 /* Keep only defined symbols. */
878 if (sym.st_shndx == SHN_UNDEF)
879 continue;
880
881 if ((name = elf_strptr(e, tabndx,
882 sym.st_name)) == NULL) {
883 bsdar_warnc(bsdar, 0,
884 "elf_strptr failed: %s",
885 elf_errmsg(-1));
886 continue;
887 }
888
889 add_to_ar_sym_table(bsdar, name);
890 }
891 }
892 }
893 elferr = elf_errno();
894 if (elferr != 0)
895 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
896 elf_errmsg(elferr));
897 }
898
899 /*
900 * Append to the archive string table buffer.
901 */
902 static void
add_to_ar_str_table(struct bsdar * bsdar,const char * name)903 add_to_ar_str_table(struct bsdar *bsdar, const char *name)
904 {
905
906 if (bsdar->as == NULL) {
907 bsdar->as_cap = _INIT_AS_CAP;
908 bsdar->as_sz = 0;
909 if ((bsdar->as = malloc(bsdar->as_cap)) == NULL)
910 bsdar_errc(bsdar, errno, "malloc failed");
911 }
912
913 /*
914 * The space required for holding one member name in the 'as'
915 * table includes: strlen(name) + (1 for '/') + (1 for '\n') +
916 * (possibly 1 for padding).
917 */
918 while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) {
919 bsdar->as_cap *= 2;
920 bsdar->as = realloc(bsdar->as, bsdar->as_cap);
921 if (bsdar->as == NULL)
922 bsdar_errc(bsdar, errno, "realloc failed");
923 }
924 strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name));
925 bsdar->as_sz += strlen(name);
926 bsdar->as[bsdar->as_sz++] = '/';
927 bsdar->as[bsdar->as_sz++] = '\n';
928 }
929
930 /*
931 * Append to the archive symbol table buffer.
932 */
933 static void
add_to_ar_sym_table(struct bsdar * bsdar,const char * name)934 add_to_ar_sym_table(struct bsdar *bsdar, const char *name)
935 {
936
937 if (bsdar->s_so == NULL) {
938 if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) ==
939 NULL)
940 bsdar_errc(bsdar, errno, "malloc failed");
941 bsdar->s_so_cap = _INIT_SYMOFF_CAP;
942 bsdar->s_cnt = 0;
943 }
944
945 if (bsdar->s_sn == NULL) {
946 if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL)
947 bsdar_errc(bsdar, errno, "malloc failed");
948 bsdar->s_sn_cap = _INIT_SYMNAME_CAP;
949 bsdar->s_sn_sz = 0;
950 }
951
952 if (bsdar->s_cnt * sizeof(uint32_t) >= bsdar->s_so_cap) {
953 bsdar->s_so_cap *= 2;
954 bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap);
955 if (bsdar->s_so == NULL)
956 bsdar_errc(bsdar, errno, "realloc failed");
957 }
958 bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off;
959 bsdar->s_cnt++;
960
961 /*
962 * The space required for holding one symbol name in the 'sn'
963 * table includes: strlen(name) + (1 for '\n') + (possibly 1
964 * for padding).
965 */
966 while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) {
967 bsdar->s_sn_cap *= 2;
968 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap);
969 if (bsdar->s_sn == NULL)
970 bsdar_errc(bsdar, errno, "realloc failed");
971 }
972 strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name));
973 bsdar->s_sn_sz += strlen(name);
974 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
975 }
976