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: head/usr.bin/ar/write.c 183218 2008-09-20 22:10:10Z kaiw $");
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
45#include "ar.h"
46
47#define _ARMAG_LEN 8 /* length of ar magic string */
48#define _ARHDR_LEN 60 /* length of ar header */
49#define _INIT_AS_CAP 128 /* initial archive string table size */
50#define _INIT_SYMOFF_CAP (256*(sizeof(uint32_t))) /* initial so table size */
51#define _INIT_SYMNAME_CAP 1024 /* initial sn table size */
52#define _MAXNAMELEN_SVR4 15 /* max member name length in svr4 variant */
53#define _TRUNCATE_LEN 15 /* number of bytes to keep for member name */
54
55static void add_to_ar_str_table(struct bsdar *bsdar, const char *name);
56static void add_to_ar_sym_table(struct bsdar *bsdar, const char *name);
57static struct ar_obj *create_obj_from_file(struct bsdar *bsdar,
58 const char *name, time_t mtime);
59static void create_symtab_entry(struct bsdar *bsdar, void *maddr,
60 size_t size);
61static void insert_obj(struct bsdar *bsdar, struct ar_obj *obj,
62 struct ar_obj *pos);
63static void read_objs(struct bsdar *bsdar, const char *archive,
64 int checkargv);
65static void write_archive(struct bsdar *bsdar, char mode);
66static void write_cleanup(struct bsdar *bsdar);
67static void write_data(struct bsdar *bsdar, struct archive *a,
68 const void *buf, size_t s);
69static void write_objs(struct bsdar *bsdar);
70
71void
72ar_mode_d(struct bsdar *bsdar)
73{
74
75 write_archive(bsdar, 'd');
76}
77
78void
79ar_mode_m(struct bsdar *bsdar)
80{
81
82 write_archive(bsdar, 'm');
83}
84
85void
86ar_mode_q(struct bsdar *bsdar)
87{
88
89 write_archive(bsdar, 'q');
90}
91
92void
93ar_mode_r(struct bsdar *bsdar)
94{
95
96 write_archive(bsdar, 'r');
97}
98
99void
100ar_mode_s(struct bsdar *bsdar)
101{
102
103 write_archive(bsdar, 's');
104}
105
106void
107ar_mode_A(struct bsdar *bsdar)
108{
109
110 write_archive(bsdar, 'A');
111}
112
113/*
114 * Create object from file, return created obj upon success, or NULL
115 * when an error occurs or the member is not newer than existing
116 * one while -u is specifed.
117 */
118static struct ar_obj *
119create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime)
120{
121 struct ar_obj *obj;
122 struct stat sb;
123 const char *bname;
124
125 if (name == NULL)
126 return (NULL);
127
128 obj = malloc(sizeof(struct ar_obj));
129 if (obj == NULL)
130 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
131 if ((obj->fd = open(name, O_RDONLY, 0)) < 0) {
132 bsdar_warnc(bsdar, errno, "can't open file: %s", name);
133 free(obj);
134 return (NULL);
135 }
136
137 if ((bname = basename(name)) == NULL)
138 bsdar_errc(bsdar, EX_SOFTWARE, errno, "basename failed");
139 if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) {
140 if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL)
141 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
142 (void)strncpy(obj->name, bname, _TRUNCATE_LEN);
143 obj->name[_TRUNCATE_LEN] = '\0';
144 } else
145 if ((obj->name = strdup(bname)) == NULL)
146 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
147
148 if (fstat(obj->fd, &sb) < 0) {
149 bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name);
150 goto giveup;
151 }
152 if (!S_ISREG(sb.st_mode)) {
153 bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name);
154 goto giveup;
155 }
156
157 /*
158 * When option '-u' is specified and member is not newer than the
159 * existing one, the replace will not happen. While if mtime == 0,
160 * which indicates that this is to "replace a none exist member",
161 * the replace will proceed regardless of '-u'.
162 */
163 if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime)
164 goto giveup;
165
166 obj->uid = sb.st_uid;
167 obj->gid = sb.st_gid;
168 obj->md = sb.st_mode;
169 obj->size = sb.st_size;
170 obj->mtime = sb.st_mtime;
171 obj->dev = sb.st_dev;
172 obj->ino = sb.st_ino;
173
174 if (obj->size == 0) {
175 obj->maddr = NULL;
176 return (obj);
177 }
178
179 if ((obj->maddr = mmap(NULL, obj->size, PROT_READ,
180 MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) {
181 bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name);
182 goto giveup;
183 }
184 if (close(obj->fd) < 0)
185 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
186 obj->name);
187
188 return (obj);
189
190giveup:
191 if (close(obj->fd) < 0)
192 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
193 obj->name);
194 free(obj->name);
195 free(obj);
196 return (NULL);
197}
198
199/*
200 * Insert obj to the tail, or before/after the pos obj.
201 */
202static void
203insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos)
204{
205 if (obj == NULL)
206 bsdar_errc(bsdar, EX_SOFTWARE, 0, "try to insert a null obj");
207
208 if (pos == NULL || obj == pos)
209 /*
210 * If the object to move happens to be the posistion obj,
211 * or if there is not a pos obj, move it to tail.
212 */
213 goto tail;
214
215 if (bsdar->options & AR_B) {
216 TAILQ_INSERT_BEFORE(pos, obj, objs);
217 return;
218 }
219 if (bsdar->options & AR_A) {
220 TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs);
221 return;
222 }
223
224tail:
225 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
226
227}
228
229/*
230 * Read objects from archive into v_obj list. Note that checkargv is
231 * set when read_objs is used to read objects from the target of
232 * ADDLIB command (ar script mode), in this case argv array possibly
233 * specifies the members ADDLIB want.
234 */
235static void
236read_objs(struct bsdar *bsdar, const char *archive, int checkargv)
237{
238 struct archive *a;
239 struct archive_entry *entry;
240 struct ar_obj *obj;
241 const char *name;
242 const char *bname;
243 char *buff;
244 char **av;
245 size_t size;
246 int i, r, find;
247
248 if ((a = archive_read_new()) == NULL)
249 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_read_new failed");
250 archive_read_support_compression_all(a);
251 archive_read_support_format_ar(a);
252 AC(archive_read_open_filename(a, archive, DEF_BLKSZ));
253 for (;;) {
254 r = archive_read_next_header(a, &entry);
255 if (r == ARCHIVE_FATAL)
256 bsdar_errc(bsdar, EX_DATAERR, 0, "%s",
257 archive_error_string(a));
258 if (r == ARCHIVE_EOF)
259 break;
260 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY)
261 bsdar_warnc(bsdar, 0, "%s", archive_error_string(a));
262 if (r == ARCHIVE_RETRY) {
263 bsdar_warnc(bsdar, 0, "Retrying...");
264 continue;
265 }
266
267 /*
268 * Remember the compression mode of existing archive.
269 * If neither -j nor -z is specified, this mode will
270 * be used for resulting archive.
271 */
272 bsdar->compression = archive_compression(a);
273
274 name = archive_entry_pathname(entry);
275
276 /*
277 * skip pseudo members.
278 */
279 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0)
280 continue;
281
282 /*
283 * If checkargv is set, only read those members specified
284 * in argv.
285 */
286 if (checkargv && bsdar->argc > 0) {
287 find = 0;
288 for(i = 0; i < bsdar->argc; i++) {
289 av = &bsdar->argv[i];
290 if (*av == NULL)
291 continue;
292 if ((bname = basename(*av)) == NULL)
293 bsdar_errc(bsdar, EX_SOFTWARE, errno,
294 "basename failed");
295 if (strcmp(bname, name) != 0)
296 continue;
297
298 *av = NULL;
299 find = 1;
300 break;
301 }
302 if (!find)
303 continue;
304 }
305
306 size = archive_entry_size(entry);
307
308 if (size > 0) {
309 if ((buff = malloc(size)) == NULL)
310 bsdar_errc(bsdar, EX_SOFTWARE, errno,
311 "malloc failed");
312 if (archive_read_data(a, buff, size) != (ssize_t)size) {
313 bsdar_warnc(bsdar, 0, "%s",
314 archive_error_string(a));
315 free(buff);
316 continue;
317 }
318 } else
319 buff = NULL;
320
321 obj = malloc(sizeof(struct ar_obj));
322 if (obj == NULL)
323 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
324 obj->maddr = buff;
325 if ((obj->name = strdup(name)) == NULL)
326 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
327 obj->size = size;
328 obj->uid = archive_entry_uid(entry);
329 obj->gid = archive_entry_gid(entry);
330 obj->md = archive_entry_mode(entry);
331 obj->mtime = archive_entry_mtime(entry);
332 obj->dev = 0;
333 obj->ino = 0;
334
335 /*
336 * Objects from archive have obj->fd set to -1,
337 * for the ease of cleaning up.
338 */
339 obj->fd = -1;
340 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
341 }
342 AC(archive_read_close(a));
343 AC(archive_read_finish(a));
344}
345
346/*
347 * Determine the constitution of resulting archive.
348 */
349static void
350write_archive(struct bsdar *bsdar, char mode)
351{
352 struct ar_obj *nobj, *obj, *obj_temp, *pos;
353 struct stat sb;
354 const char *bname;
355 char **av;
356 int i;
357
358 TAILQ_INIT(&bsdar->v_obj);
359 nobj = NULL;
360 pos = NULL;
361 memset(&sb, 0, sizeof(sb));
362
363 /* By default, no compression is assumed. */
364 bsdar->compression = ARCHIVE_COMPRESSION_NONE;
365
366 /*
367 * Test if the specified archive exists, to figure out
368 * whether we are creating one here.
369 */
370 if (stat(bsdar->filename, &sb) != 0) {
371 if (errno != ENOENT) {
372 bsdar_warnc(bsdar, 0, "stat %s failed",
373 bsdar->filename);
374 return;
375 }
376
377 /* We do not create archive in mode 'd', 'm' and 's'. */
378 if (mode != 'r' && mode != 'q') {
379 bsdar_warnc(bsdar, 0, "%s: no such file",
380 bsdar->filename);
381 return;
382 }
383
384 /* Issue a warning if -c is not specified when creating. */
385 if (!(bsdar->options & AR_C))
386 bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename);
387 goto new_archive;
388 }
389
390 /*
391 * First read members from existing archive.
392 */
393 read_objs(bsdar, bsdar->filename, 0);
394
395 /*
396 * For mode 's', no member will be moved, deleted or replaced.
397 */
398 if (mode == 's')
399 goto write_objs;
400
401 /*
402 * For mode 'q', we don't need to adjust existing members either.
403 * Also, -a, -b and -i are ignored in this mode. New members are
404 * always inserted at tail.
405 */
406 if (mode == 'q')
407 goto new_archive;
408
409 /*
410 * Mode 'A' adds the contents of another archive to the tail of
411 * current archive. Note that mode 'A' is a special mode for the
412 * ADDLIB command of the ar script mode. Currently there is no
413 * access to this function from the ar command line mode.
414 */
415 if (mode == 'A') {
416 /*
417 * Read objects from the target archive of ADDLIB command.
418 * If there are members spcified in argv, read those members
419 * only, otherwise the entire archive will be read.
420 */
421 read_objs(bsdar, bsdar->addlib, 1);
422 goto write_objs;
423 }
424
425 /*
426 * Try to find the position member specified by user.
427 */
428 if (bsdar->options & AR_A || bsdar->options & AR_B) {
429 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
430 if (strcmp(obj->name, bsdar->posarg) == 0) {
431 pos = obj;
432 break;
433 }
434 }
435
436 /*
437 * If can't find `pos' specified by user,
438 * sliently insert objects at tail.
439 */
440 if (pos == NULL)
441 bsdar->options &= ~(AR_A | AR_B);
442 }
443
444 for (i = 0; i < bsdar->argc; i++) {
445 av = &bsdar->argv[i];
446
447 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
448 if ((bname = basename(*av)) == NULL)
449 bsdar_errc(bsdar, EX_SOFTWARE, errno,
450 "basename failed");
451 if (bsdar->options & AR_TR) {
452 if (strncmp(bname, obj->name, _TRUNCATE_LEN))
453 continue;
454 } else
455 if (strcmp(bname, obj->name) != 0)
456 continue;
457
458 if (mode == 'r') {
459 /*
460 * if the new member is not qualified
461 * to replace the old one, skip it.
462 */
463 nobj = create_obj_from_file(bsdar, *av,
464 obj->mtime);
465 if (nobj == NULL)
466 goto skip_obj;
467 }
468
469 if (bsdar->options & AR_V)
470 (void)fprintf(stdout, "%c - %s\n", mode,
471 *av);
472
473 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
474 if (mode == 'd' || mode == 'r') {
475 free(obj->maddr);
476 free(obj->name);
477 free(obj);
478 }
479
480 if (mode == 'm')
481 insert_obj(bsdar, obj, pos);
482 if (mode == 'r')
483 insert_obj(bsdar, nobj, pos);
484
485 skip_obj:
486 *av = NULL;
487 break;
488 }
489
490 }
491
492new_archive:
493 /*
494 * When operating in mode 'r', directly add those user specified
495 * objects which do not exist in current archive. When operating
496 * in mode 'q', all objects specified in command line args are
497 * appended to the archive, without comparing with existing ones.
498 */
499 for (i = 0; i < bsdar->argc; i++) {
500 av = &bsdar->argv[i];
501 if (*av != NULL && (mode == 'r' || mode == 'q')) {
502 nobj = create_obj_from_file(bsdar, *av, 0);
503 if (nobj != NULL)
504 insert_obj(bsdar, nobj, pos);
505 if (bsdar->options & AR_V && nobj != NULL)
506 (void)fprintf(stdout, "a - %s\n", *av);
507 *av = NULL;
508 }
509 }
510
511write_objs:
512 write_objs(bsdar);
513 write_cleanup(bsdar);
514}
515
516/*
517 * Memory cleaning up.
518 */
519static void
520write_cleanup(struct bsdar *bsdar)
521{
522 struct ar_obj *obj, *obj_temp;
523
524 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
525 if (obj->fd == -1)
526 free(obj->maddr);
527 else
528 if (obj->maddr != NULL && munmap(obj->maddr, obj->size))
529 bsdar_warnc(bsdar, errno,
530 "can't munmap file: %s", obj->name);
531 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
532 free(obj->name);
533 free(obj);
534 }
535
536 free(bsdar->as);
537 free(bsdar->s_so);
538 free(bsdar->s_sn);
539 bsdar->as = NULL;
540 bsdar->s_so = NULL;
541 bsdar->s_sn = NULL;
542}
543
544/*
545 * Wrapper for archive_write_data().
546 */
547static void
548write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s)
549{
550 if (archive_write_data(a, buf, s) != (ssize_t)s)
551 bsdar_errc(bsdar, EX_SOFTWARE, 0, "%s",
552 archive_error_string(a));
553}
554
555/*
556 * Write the resulting archive members.
557 */
558static void
559write_objs(struct bsdar *bsdar)
560{
561 struct ar_obj *obj;
562 struct archive *a;
563 struct archive_entry *entry;
564 size_t s_sz; /* size of archive symbol table. */
565 size_t pm_sz; /* size of pseudo members */
566 int i, nr;
567
568 if (elf_version(EV_CURRENT) == EV_NONE)
569 bsdar_errc(bsdar, EX_SOFTWARE, 0,
570 "ELF library initialization failed: %s", elf_errmsg(-1));
571
572 bsdar->rela_off = 0;
573
574 /* Create archive symbol table and archive string table, if need. */
575 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
576 if (!(bsdar->options & AR_SS) && obj->maddr != NULL)
577 create_symtab_entry(bsdar, obj->maddr, obj->size);
578 if (strlen(obj->name) > _MAXNAMELEN_SVR4)
579 add_to_ar_str_table(bsdar, obj->name);
580 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2;
581 }
582
583 /*
584 * Pad the symbol name string table. It is treated specially because
585 * symbol name table should be padded by a '\0', not the common '\n'
586 * for other members. The size of sn table includes the pad bit.
587 */
588 if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0)
589 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
590
591 /*
592 * Archive string table is padded by a "\n" as the normal members.
593 * The difference is that the size of archive string table counts
594 * in the pad bit, while normal members' size fileds do not.
595 */
596 if (bsdar->as != NULL && bsdar->as_sz % 2 != 0)
597 bsdar->as[bsdar->as_sz++] = '\n';
598
599 /*
600 * If there is a symbol table, calculate the size of pseudo members,
601 * convert previously stored relative offsets to absolute ones, and
602 * then make them Big Endian.
603 *
604 * absolute_offset = htobe32(relative_offset + size_of_pseudo_members)
605 */
606
607 if (bsdar->s_cnt != 0) {
608 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz;
609 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz);
610 if (bsdar->as != NULL)
611 pm_sz += _ARHDR_LEN + bsdar->as_sz;
612 for (i = 0; (size_t)i < bsdar->s_cnt; i++)
613 *(bsdar->s_so + i) = htobe32(*(bsdar->s_so + i) +
614 pm_sz);
615 }
616
617 if ((a = archive_write_new()) == NULL)
618 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_write_new failed");
619
620 archive_write_set_format_ar_svr4(a);
621
622 /* The compression mode of the existing archive is used
623 * for the result archive or if creating a new archive, we
624 * do not compress archive by default. This default behavior can
625 * be overrided by compression mode specified explicitly
626 * through command line option `-j' or `-z'.
627 */
628 if (bsdar->options & AR_J)
629 bsdar->compression = ARCHIVE_COMPRESSION_BZIP2;
630 if (bsdar->options & AR_Z)
631 bsdar->compression = ARCHIVE_COMPRESSION_GZIP;
632 if (bsdar->compression == ARCHIVE_COMPRESSION_BZIP2)
633 archive_write_set_compression_bzip2(a);
634 else if (bsdar->compression == ARCHIVE_COMPRESSION_GZIP)
635 archive_write_set_compression_gzip(a);
636 else
637 archive_write_set_compression_none(a);
638
639 AC(archive_write_open_filename(a, bsdar->filename));
640
641 /*
642 * write the archive symbol table, if there is one.
643 * If options -s is explicitly specified or we are invoked
644 * as ranlib, write the symbol table even if it is empty.
645 */
646 if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) ||
647 bsdar->options & AR_S) {
648 entry = archive_entry_new();
649 archive_entry_copy_pathname(entry, "/");
650 archive_entry_set_mtime(entry, time(NULL), 0);
651 archive_entry_set_size(entry, (bsdar->s_cnt + 1) *
652 sizeof(uint32_t) + bsdar->s_sn_sz);
653 AC(archive_write_header(a, entry));
654 nr = htobe32(bsdar->s_cnt);
655 write_data(bsdar, a, &nr, sizeof(uint32_t));
656 write_data(bsdar, a, bsdar->s_so, sizeof(uint32_t) *
657 bsdar->s_cnt);
658 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
659 archive_entry_free(entry);
660 }
661
662 /* write the archive string table, if any. */
663 if (bsdar->as != NULL) {
664 entry = archive_entry_new();
665 archive_entry_copy_pathname(entry, "//");
666 archive_entry_set_size(entry, bsdar->as_sz);
667 AC(archive_write_header(a, entry));
668 write_data(bsdar, a, bsdar->as, bsdar->as_sz);
669 archive_entry_free(entry);
670 }
671
672 /* write normal members. */
673 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
674 entry = archive_entry_new();
675 archive_entry_copy_pathname(entry, obj->name);
676 archive_entry_set_uid(entry, obj->uid);
677 archive_entry_set_gid(entry, obj->gid);
678 archive_entry_set_mode(entry, obj->md);
679 archive_entry_set_size(entry, obj->size);
680 archive_entry_set_mtime(entry, obj->mtime, 0);
681 archive_entry_set_dev(entry, obj->dev);
682 archive_entry_set_ino(entry, obj->ino);
683 archive_entry_set_filetype(entry, AE_IFREG);
684 AC(archive_write_header(a, entry));
685 write_data(bsdar, a, obj->maddr, obj->size);
686 archive_entry_free(entry);
687 }
688
689 AC(archive_write_close(a));
690 AC(archive_write_finish(a));
691}
692
693/*
694 * Extract global symbols from ELF binary members.
695 */
696static void
697create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size)
698{
699 Elf *e;
700 Elf_Scn *scn;
701 GElf_Shdr shdr;
702 GElf_Sym sym;
703 Elf_Data *data;
704 char *name;
705 size_t n, shstrndx;
706 int elferr, tabndx, len, i;
707
708 if ((e = elf_memory(maddr, size)) == NULL) {
709 bsdar_warnc(bsdar, 0, "elf_memory() failed: %s",
710 elf_errmsg(-1));
711 return;
712 }
713 if (elf_kind(e) != ELF_K_ELF) {
714 /* Sliently ignore non-elf member. */
715 elf_end(e);
716 return;
717 }
718 if (elf_getshstrndx(e, &shstrndx) == 0) {
719 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_getshstrndx failed: %s",
720 elf_errmsg(-1));
721 elf_end(e);
722 return;
723 }
724
725 tabndx = -1;
726 scn = NULL;
727 while ((scn = elf_nextscn(e, scn)) != NULL) {
728 if (gelf_getshdr(scn, &shdr) != &shdr) {
729 bsdar_warnc(bsdar, 0,
730 "elf_getshdr failed: %s", elf_errmsg(-1));
731 continue;
732 }
733 if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) {
734 bsdar_warnc(bsdar, 0,
735 "elf_strptr failed: %s", elf_errmsg(-1));
736 continue;
737 }
738 if (strcmp(name, ".strtab") == 0) {
739 tabndx = elf_ndxscn(scn);
740 break;
741 }
742 }
743 elferr = elf_errno();
744 if (elferr != 0)
745 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
746 elf_errmsg(elferr));
747 if (tabndx == -1) {
748 bsdar_warnc(bsdar, 0, "can't find .strtab section");
749 elf_end(e);
750 return;
751 }
752
753 scn = NULL;
754 while ((scn = elf_nextscn(e, scn)) != NULL) {
755 if (gelf_getshdr(scn, &shdr) != &shdr) {
756 bsdar_warnc(bsdar, EX_SOFTWARE, 0,
757 "elf_getshdr failed: %s", elf_errmsg(-1));
758 continue;
759 }
760 if (shdr.sh_type != SHT_SYMTAB)
761 continue;
762
763 data = NULL;
764 n = 0;
765 while (n < shdr.sh_size &&
766 (data = elf_getdata(scn, data)) != NULL) {
767 len = data->d_size / shdr.sh_entsize;
768 for (i = 0; i < len; i++) {
769 if (gelf_getsym(data, i, &sym) != &sym) {
770 bsdar_warnc(bsdar, EX_SOFTWARE, 0,
771 "gelf_getsym failed: %s",
772 elf_errmsg(-1));
773 continue;
774 }
775
776 /* keep only global or weak symbols */
777 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL &&
778 GELF_ST_BIND(sym.st_info) != STB_WEAK)
779 continue;
780
781 /* keep only defined symbols */
782 if (sym.st_shndx == SHN_UNDEF)
783 continue;
784
785 if ((name = elf_strptr(e, tabndx,
786 sym.st_name)) == NULL) {
787 bsdar_warnc(bsdar, EX_SOFTWARE, 0,
788 "elf_strptr failed: %s",
789 elf_errmsg(-1));
790 continue;
791 }
792
793 add_to_ar_sym_table(bsdar, name);
794 }
795 }
796 }
797 elferr = elf_errno();
798 if (elferr != 0)
799 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_nextscn failed: %s",
800 elf_errmsg(elferr));
801
802 elf_end(e);
803}
804
805/*
806 * Append to the archive string table buffer.
807 */
808static void
809add_to_ar_str_table(struct bsdar *bsdar, const char *name)
810{
811
812 if (bsdar->as == NULL) {
813 bsdar->as_cap = _INIT_AS_CAP;
814 bsdar->as_sz = 0;
815 if ((bsdar->as = malloc(bsdar->as_cap)) == NULL)
816 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
817 }
818
819 /*
820 * The space required for holding one member name in as table includes:
821 * strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding).
822 */
823 while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) {
824 bsdar->as_cap *= 2;
825 bsdar->as = realloc(bsdar->as, bsdar->as_cap);
826 if (bsdar->as == NULL)
827 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
828 }
829 strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name));
830 bsdar->as_sz += strlen(name);
831 bsdar->as[bsdar->as_sz++] = '/';
832 bsdar->as[bsdar->as_sz++] = '\n';
833}
834
835/*
836 * Append to the archive symbol table buffer.
837 */
838static void
839add_to_ar_sym_table(struct bsdar *bsdar, const char *name)
840{
841
842 if (bsdar->s_so == NULL) {
843 if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) ==
844 NULL)
845 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
846 bsdar->s_so_cap = _INIT_SYMOFF_CAP;
847 bsdar->s_cnt = 0;
848 }
849
850 if (bsdar->s_sn == NULL) {
851 if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL)
852 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
853 bsdar->s_sn_cap = _INIT_SYMNAME_CAP;
854 bsdar->s_sn_sz = 0;
855 }
856
857 if (bsdar->s_cnt * sizeof(uint32_t) >= bsdar->s_so_cap) {
858 bsdar->s_so_cap *= 2;
859 bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap);
860 if (bsdar->s_so == NULL)
861 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
862 }
863 bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off;
864 bsdar->s_cnt++;
865
866 /*
867 * The space required for holding one symbol name in sn table includes:
868 * strlen(name) + (1 for '\n') + (possibly 1 for padding).
869 */
870 while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) {
871 bsdar->s_sn_cap *= 2;
872 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap);
873 if (bsdar->s_sn == NULL)
874 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
875 }
876 strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name));
877 bsdar->s_sn_sz += strlen(name);
878 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
879}
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: head/usr.bin/ar/write.c 183218 2008-09-20 22:10:10Z kaiw $");
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
45#include "ar.h"
46
47#define _ARMAG_LEN 8 /* length of ar magic string */
48#define _ARHDR_LEN 60 /* length of ar header */
49#define _INIT_AS_CAP 128 /* initial archive string table size */
50#define _INIT_SYMOFF_CAP (256*(sizeof(uint32_t))) /* initial so table size */
51#define _INIT_SYMNAME_CAP 1024 /* initial sn table size */
52#define _MAXNAMELEN_SVR4 15 /* max member name length in svr4 variant */
53#define _TRUNCATE_LEN 15 /* number of bytes to keep for member name */
54
55static void add_to_ar_str_table(struct bsdar *bsdar, const char *name);
56static void add_to_ar_sym_table(struct bsdar *bsdar, const char *name);
57static struct ar_obj *create_obj_from_file(struct bsdar *bsdar,
58 const char *name, time_t mtime);
59static void create_symtab_entry(struct bsdar *bsdar, void *maddr,
60 size_t size);
61static void insert_obj(struct bsdar *bsdar, struct ar_obj *obj,
62 struct ar_obj *pos);
63static void read_objs(struct bsdar *bsdar, const char *archive,
64 int checkargv);
65static void write_archive(struct bsdar *bsdar, char mode);
66static void write_cleanup(struct bsdar *bsdar);
67static void write_data(struct bsdar *bsdar, struct archive *a,
68 const void *buf, size_t s);
69static void write_objs(struct bsdar *bsdar);
70
71void
72ar_mode_d(struct bsdar *bsdar)
73{
74
75 write_archive(bsdar, 'd');
76}
77
78void
79ar_mode_m(struct bsdar *bsdar)
80{
81
82 write_archive(bsdar, 'm');
83}
84
85void
86ar_mode_q(struct bsdar *bsdar)
87{
88
89 write_archive(bsdar, 'q');
90}
91
92void
93ar_mode_r(struct bsdar *bsdar)
94{
95
96 write_archive(bsdar, 'r');
97}
98
99void
100ar_mode_s(struct bsdar *bsdar)
101{
102
103 write_archive(bsdar, 's');
104}
105
106void
107ar_mode_A(struct bsdar *bsdar)
108{
109
110 write_archive(bsdar, 'A');
111}
112
113/*
114 * Create object from file, return created obj upon success, or NULL
115 * when an error occurs or the member is not newer than existing
116 * one while -u is specifed.
117 */
118static struct ar_obj *
119create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime)
120{
121 struct ar_obj *obj;
122 struct stat sb;
123 const char *bname;
124
125 if (name == NULL)
126 return (NULL);
127
128 obj = malloc(sizeof(struct ar_obj));
129 if (obj == NULL)
130 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
131 if ((obj->fd = open(name, O_RDONLY, 0)) < 0) {
132 bsdar_warnc(bsdar, errno, "can't open file: %s", name);
133 free(obj);
134 return (NULL);
135 }
136
137 if ((bname = basename(name)) == NULL)
138 bsdar_errc(bsdar, EX_SOFTWARE, errno, "basename failed");
139 if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) {
140 if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL)
141 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
142 (void)strncpy(obj->name, bname, _TRUNCATE_LEN);
143 obj->name[_TRUNCATE_LEN] = '\0';
144 } else
145 if ((obj->name = strdup(bname)) == NULL)
146 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
147
148 if (fstat(obj->fd, &sb) < 0) {
149 bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name);
150 goto giveup;
151 }
152 if (!S_ISREG(sb.st_mode)) {
153 bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name);
154 goto giveup;
155 }
156
157 /*
158 * When option '-u' is specified and member is not newer than the
159 * existing one, the replace will not happen. While if mtime == 0,
160 * which indicates that this is to "replace a none exist member",
161 * the replace will proceed regardless of '-u'.
162 */
163 if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime)
164 goto giveup;
165
166 obj->uid = sb.st_uid;
167 obj->gid = sb.st_gid;
168 obj->md = sb.st_mode;
169 obj->size = sb.st_size;
170 obj->mtime = sb.st_mtime;
171 obj->dev = sb.st_dev;
172 obj->ino = sb.st_ino;
173
174 if (obj->size == 0) {
175 obj->maddr = NULL;
176 return (obj);
177 }
178
179 if ((obj->maddr = mmap(NULL, obj->size, PROT_READ,
180 MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) {
181 bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name);
182 goto giveup;
183 }
184 if (close(obj->fd) < 0)
185 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
186 obj->name);
187
188 return (obj);
189
190giveup:
191 if (close(obj->fd) < 0)
192 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
193 obj->name);
194 free(obj->name);
195 free(obj);
196 return (NULL);
197}
198
199/*
200 * Insert obj to the tail, or before/after the pos obj.
201 */
202static void
203insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos)
204{
205 if (obj == NULL)
206 bsdar_errc(bsdar, EX_SOFTWARE, 0, "try to insert a null obj");
207
208 if (pos == NULL || obj == pos)
209 /*
210 * If the object to move happens to be the posistion obj,
211 * or if there is not a pos obj, move it to tail.
212 */
213 goto tail;
214
215 if (bsdar->options & AR_B) {
216 TAILQ_INSERT_BEFORE(pos, obj, objs);
217 return;
218 }
219 if (bsdar->options & AR_A) {
220 TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs);
221 return;
222 }
223
224tail:
225 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
226
227}
228
229/*
230 * Read objects from archive into v_obj list. Note that checkargv is
231 * set when read_objs is used to read objects from the target of
232 * ADDLIB command (ar script mode), in this case argv array possibly
233 * specifies the members ADDLIB want.
234 */
235static void
236read_objs(struct bsdar *bsdar, const char *archive, int checkargv)
237{
238 struct archive *a;
239 struct archive_entry *entry;
240 struct ar_obj *obj;
241 const char *name;
242 const char *bname;
243 char *buff;
244 char **av;
245 size_t size;
246 int i, r, find;
247
248 if ((a = archive_read_new()) == NULL)
249 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_read_new failed");
250 archive_read_support_compression_all(a);
251 archive_read_support_format_ar(a);
252 AC(archive_read_open_filename(a, archive, DEF_BLKSZ));
253 for (;;) {
254 r = archive_read_next_header(a, &entry);
255 if (r == ARCHIVE_FATAL)
256 bsdar_errc(bsdar, EX_DATAERR, 0, "%s",
257 archive_error_string(a));
258 if (r == ARCHIVE_EOF)
259 break;
260 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY)
261 bsdar_warnc(bsdar, 0, "%s", archive_error_string(a));
262 if (r == ARCHIVE_RETRY) {
263 bsdar_warnc(bsdar, 0, "Retrying...");
264 continue;
265 }
266
267 /*
268 * Remember the compression mode of existing archive.
269 * If neither -j nor -z is specified, this mode will
270 * be used for resulting archive.
271 */
272 bsdar->compression = archive_compression(a);
273
274 name = archive_entry_pathname(entry);
275
276 /*
277 * skip pseudo members.
278 */
279 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0)
280 continue;
281
282 /*
283 * If checkargv is set, only read those members specified
284 * in argv.
285 */
286 if (checkargv && bsdar->argc > 0) {
287 find = 0;
288 for(i = 0; i < bsdar->argc; i++) {
289 av = &bsdar->argv[i];
290 if (*av == NULL)
291 continue;
292 if ((bname = basename(*av)) == NULL)
293 bsdar_errc(bsdar, EX_SOFTWARE, errno,
294 "basename failed");
295 if (strcmp(bname, name) != 0)
296 continue;
297
298 *av = NULL;
299 find = 1;
300 break;
301 }
302 if (!find)
303 continue;
304 }
305
306 size = archive_entry_size(entry);
307
308 if (size > 0) {
309 if ((buff = malloc(size)) == NULL)
310 bsdar_errc(bsdar, EX_SOFTWARE, errno,
311 "malloc failed");
312 if (archive_read_data(a, buff, size) != (ssize_t)size) {
313 bsdar_warnc(bsdar, 0, "%s",
314 archive_error_string(a));
315 free(buff);
316 continue;
317 }
318 } else
319 buff = NULL;
320
321 obj = malloc(sizeof(struct ar_obj));
322 if (obj == NULL)
323 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
324 obj->maddr = buff;
325 if ((obj->name = strdup(name)) == NULL)
326 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
327 obj->size = size;
328 obj->uid = archive_entry_uid(entry);
329 obj->gid = archive_entry_gid(entry);
330 obj->md = archive_entry_mode(entry);
331 obj->mtime = archive_entry_mtime(entry);
332 obj->dev = 0;
333 obj->ino = 0;
334
335 /*
336 * Objects from archive have obj->fd set to -1,
337 * for the ease of cleaning up.
338 */
339 obj->fd = -1;
340 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
341 }
342 AC(archive_read_close(a));
343 AC(archive_read_finish(a));
344}
345
346/*
347 * Determine the constitution of resulting archive.
348 */
349static void
350write_archive(struct bsdar *bsdar, char mode)
351{
352 struct ar_obj *nobj, *obj, *obj_temp, *pos;
353 struct stat sb;
354 const char *bname;
355 char **av;
356 int i;
357
358 TAILQ_INIT(&bsdar->v_obj);
359 nobj = NULL;
360 pos = NULL;
361 memset(&sb, 0, sizeof(sb));
362
363 /* By default, no compression is assumed. */
364 bsdar->compression = ARCHIVE_COMPRESSION_NONE;
365
366 /*
367 * Test if the specified archive exists, to figure out
368 * whether we are creating one here.
369 */
370 if (stat(bsdar->filename, &sb) != 0) {
371 if (errno != ENOENT) {
372 bsdar_warnc(bsdar, 0, "stat %s failed",
373 bsdar->filename);
374 return;
375 }
376
377 /* We do not create archive in mode 'd', 'm' and 's'. */
378 if (mode != 'r' && mode != 'q') {
379 bsdar_warnc(bsdar, 0, "%s: no such file",
380 bsdar->filename);
381 return;
382 }
383
384 /* Issue a warning if -c is not specified when creating. */
385 if (!(bsdar->options & AR_C))
386 bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename);
387 goto new_archive;
388 }
389
390 /*
391 * First read members from existing archive.
392 */
393 read_objs(bsdar, bsdar->filename, 0);
394
395 /*
396 * For mode 's', no member will be moved, deleted or replaced.
397 */
398 if (mode == 's')
399 goto write_objs;
400
401 /*
402 * For mode 'q', we don't need to adjust existing members either.
403 * Also, -a, -b and -i are ignored in this mode. New members are
404 * always inserted at tail.
405 */
406 if (mode == 'q')
407 goto new_archive;
408
409 /*
410 * Mode 'A' adds the contents of another archive to the tail of
411 * current archive. Note that mode 'A' is a special mode for the
412 * ADDLIB command of the ar script mode. Currently there is no
413 * access to this function from the ar command line mode.
414 */
415 if (mode == 'A') {
416 /*
417 * Read objects from the target archive of ADDLIB command.
418 * If there are members spcified in argv, read those members
419 * only, otherwise the entire archive will be read.
420 */
421 read_objs(bsdar, bsdar->addlib, 1);
422 goto write_objs;
423 }
424
425 /*
426 * Try to find the position member specified by user.
427 */
428 if (bsdar->options & AR_A || bsdar->options & AR_B) {
429 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
430 if (strcmp(obj->name, bsdar->posarg) == 0) {
431 pos = obj;
432 break;
433 }
434 }
435
436 /*
437 * If can't find `pos' specified by user,
438 * sliently insert objects at tail.
439 */
440 if (pos == NULL)
441 bsdar->options &= ~(AR_A | AR_B);
442 }
443
444 for (i = 0; i < bsdar->argc; i++) {
445 av = &bsdar->argv[i];
446
447 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
448 if ((bname = basename(*av)) == NULL)
449 bsdar_errc(bsdar, EX_SOFTWARE, errno,
450 "basename failed");
451 if (bsdar->options & AR_TR) {
452 if (strncmp(bname, obj->name, _TRUNCATE_LEN))
453 continue;
454 } else
455 if (strcmp(bname, obj->name) != 0)
456 continue;
457
458 if (mode == 'r') {
459 /*
460 * if the new member is not qualified
461 * to replace the old one, skip it.
462 */
463 nobj = create_obj_from_file(bsdar, *av,
464 obj->mtime);
465 if (nobj == NULL)
466 goto skip_obj;
467 }
468
469 if (bsdar->options & AR_V)
470 (void)fprintf(stdout, "%c - %s\n", mode,
471 *av);
472
473 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
474 if (mode == 'd' || mode == 'r') {
475 free(obj->maddr);
476 free(obj->name);
477 free(obj);
478 }
479
480 if (mode == 'm')
481 insert_obj(bsdar, obj, pos);
482 if (mode == 'r')
483 insert_obj(bsdar, nobj, pos);
484
485 skip_obj:
486 *av = NULL;
487 break;
488 }
489
490 }
491
492new_archive:
493 /*
494 * When operating in mode 'r', directly add those user specified
495 * objects which do not exist in current archive. When operating
496 * in mode 'q', all objects specified in command line args are
497 * appended to the archive, without comparing with existing ones.
498 */
499 for (i = 0; i < bsdar->argc; i++) {
500 av = &bsdar->argv[i];
501 if (*av != NULL && (mode == 'r' || mode == 'q')) {
502 nobj = create_obj_from_file(bsdar, *av, 0);
503 if (nobj != NULL)
504 insert_obj(bsdar, nobj, pos);
505 if (bsdar->options & AR_V && nobj != NULL)
506 (void)fprintf(stdout, "a - %s\n", *av);
507 *av = NULL;
508 }
509 }
510
511write_objs:
512 write_objs(bsdar);
513 write_cleanup(bsdar);
514}
515
516/*
517 * Memory cleaning up.
518 */
519static void
520write_cleanup(struct bsdar *bsdar)
521{
522 struct ar_obj *obj, *obj_temp;
523
524 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
525 if (obj->fd == -1)
526 free(obj->maddr);
527 else
528 if (obj->maddr != NULL && munmap(obj->maddr, obj->size))
529 bsdar_warnc(bsdar, errno,
530 "can't munmap file: %s", obj->name);
531 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
532 free(obj->name);
533 free(obj);
534 }
535
536 free(bsdar->as);
537 free(bsdar->s_so);
538 free(bsdar->s_sn);
539 bsdar->as = NULL;
540 bsdar->s_so = NULL;
541 bsdar->s_sn = NULL;
542}
543
544/*
545 * Wrapper for archive_write_data().
546 */
547static void
548write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s)
549{
550 if (archive_write_data(a, buf, s) != (ssize_t)s)
551 bsdar_errc(bsdar, EX_SOFTWARE, 0, "%s",
552 archive_error_string(a));
553}
554
555/*
556 * Write the resulting archive members.
557 */
558static void
559write_objs(struct bsdar *bsdar)
560{
561 struct ar_obj *obj;
562 struct archive *a;
563 struct archive_entry *entry;
564 size_t s_sz; /* size of archive symbol table. */
565 size_t pm_sz; /* size of pseudo members */
566 int i, nr;
567
568 if (elf_version(EV_CURRENT) == EV_NONE)
569 bsdar_errc(bsdar, EX_SOFTWARE, 0,
570 "ELF library initialization failed: %s", elf_errmsg(-1));
571
572 bsdar->rela_off = 0;
573
574 /* Create archive symbol table and archive string table, if need. */
575 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
576 if (!(bsdar->options & AR_SS) && obj->maddr != NULL)
577 create_symtab_entry(bsdar, obj->maddr, obj->size);
578 if (strlen(obj->name) > _MAXNAMELEN_SVR4)
579 add_to_ar_str_table(bsdar, obj->name);
580 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2;
581 }
582
583 /*
584 * Pad the symbol name string table. It is treated specially because
585 * symbol name table should be padded by a '\0', not the common '\n'
586 * for other members. The size of sn table includes the pad bit.
587 */
588 if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0)
589 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
590
591 /*
592 * Archive string table is padded by a "\n" as the normal members.
593 * The difference is that the size of archive string table counts
594 * in the pad bit, while normal members' size fileds do not.
595 */
596 if (bsdar->as != NULL && bsdar->as_sz % 2 != 0)
597 bsdar->as[bsdar->as_sz++] = '\n';
598
599 /*
600 * If there is a symbol table, calculate the size of pseudo members,
601 * convert previously stored relative offsets to absolute ones, and
602 * then make them Big Endian.
603 *
604 * absolute_offset = htobe32(relative_offset + size_of_pseudo_members)
605 */
606
607 if (bsdar->s_cnt != 0) {
608 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz;
609 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz);
610 if (bsdar->as != NULL)
611 pm_sz += _ARHDR_LEN + bsdar->as_sz;
612 for (i = 0; (size_t)i < bsdar->s_cnt; i++)
613 *(bsdar->s_so + i) = htobe32(*(bsdar->s_so + i) +
614 pm_sz);
615 }
616
617 if ((a = archive_write_new()) == NULL)
618 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_write_new failed");
619
620 archive_write_set_format_ar_svr4(a);
621
622 /* The compression mode of the existing archive is used
623 * for the result archive or if creating a new archive, we
624 * do not compress archive by default. This default behavior can
625 * be overrided by compression mode specified explicitly
626 * through command line option `-j' or `-z'.
627 */
628 if (bsdar->options & AR_J)
629 bsdar->compression = ARCHIVE_COMPRESSION_BZIP2;
630 if (bsdar->options & AR_Z)
631 bsdar->compression = ARCHIVE_COMPRESSION_GZIP;
632 if (bsdar->compression == ARCHIVE_COMPRESSION_BZIP2)
633 archive_write_set_compression_bzip2(a);
634 else if (bsdar->compression == ARCHIVE_COMPRESSION_GZIP)
635 archive_write_set_compression_gzip(a);
636 else
637 archive_write_set_compression_none(a);
638
639 AC(archive_write_open_filename(a, bsdar->filename));
640
641 /*
642 * write the archive symbol table, if there is one.
643 * If options -s is explicitly specified or we are invoked
644 * as ranlib, write the symbol table even if it is empty.
645 */
646 if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) ||
647 bsdar->options & AR_S) {
648 entry = archive_entry_new();
649 archive_entry_copy_pathname(entry, "/");
650 archive_entry_set_mtime(entry, time(NULL), 0);
651 archive_entry_set_size(entry, (bsdar->s_cnt + 1) *
652 sizeof(uint32_t) + bsdar->s_sn_sz);
653 AC(archive_write_header(a, entry));
654 nr = htobe32(bsdar->s_cnt);
655 write_data(bsdar, a, &nr, sizeof(uint32_t));
656 write_data(bsdar, a, bsdar->s_so, sizeof(uint32_t) *
657 bsdar->s_cnt);
658 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
659 archive_entry_free(entry);
660 }
661
662 /* write the archive string table, if any. */
663 if (bsdar->as != NULL) {
664 entry = archive_entry_new();
665 archive_entry_copy_pathname(entry, "//");
666 archive_entry_set_size(entry, bsdar->as_sz);
667 AC(archive_write_header(a, entry));
668 write_data(bsdar, a, bsdar->as, bsdar->as_sz);
669 archive_entry_free(entry);
670 }
671
672 /* write normal members. */
673 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
674 entry = archive_entry_new();
675 archive_entry_copy_pathname(entry, obj->name);
676 archive_entry_set_uid(entry, obj->uid);
677 archive_entry_set_gid(entry, obj->gid);
678 archive_entry_set_mode(entry, obj->md);
679 archive_entry_set_size(entry, obj->size);
680 archive_entry_set_mtime(entry, obj->mtime, 0);
681 archive_entry_set_dev(entry, obj->dev);
682 archive_entry_set_ino(entry, obj->ino);
683 archive_entry_set_filetype(entry, AE_IFREG);
684 AC(archive_write_header(a, entry));
685 write_data(bsdar, a, obj->maddr, obj->size);
686 archive_entry_free(entry);
687 }
688
689 AC(archive_write_close(a));
690 AC(archive_write_finish(a));
691}
692
693/*
694 * Extract global symbols from ELF binary members.
695 */
696static void
697create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size)
698{
699 Elf *e;
700 Elf_Scn *scn;
701 GElf_Shdr shdr;
702 GElf_Sym sym;
703 Elf_Data *data;
704 char *name;
705 size_t n, shstrndx;
706 int elferr, tabndx, len, i;
707
708 if ((e = elf_memory(maddr, size)) == NULL) {
709 bsdar_warnc(bsdar, 0, "elf_memory() failed: %s",
710 elf_errmsg(-1));
711 return;
712 }
713 if (elf_kind(e) != ELF_K_ELF) {
714 /* Sliently ignore non-elf member. */
715 elf_end(e);
716 return;
717 }
718 if (elf_getshstrndx(e, &shstrndx) == 0) {
719 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_getshstrndx failed: %s",
720 elf_errmsg(-1));
721 elf_end(e);
722 return;
723 }
724
725 tabndx = -1;
726 scn = NULL;
727 while ((scn = elf_nextscn(e, scn)) != NULL) {
728 if (gelf_getshdr(scn, &shdr) != &shdr) {
729 bsdar_warnc(bsdar, 0,
730 "elf_getshdr failed: %s", elf_errmsg(-1));
731 continue;
732 }
733 if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) {
734 bsdar_warnc(bsdar, 0,
735 "elf_strptr failed: %s", elf_errmsg(-1));
736 continue;
737 }
738 if (strcmp(name, ".strtab") == 0) {
739 tabndx = elf_ndxscn(scn);
740 break;
741 }
742 }
743 elferr = elf_errno();
744 if (elferr != 0)
745 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
746 elf_errmsg(elferr));
747 if (tabndx == -1) {
748 bsdar_warnc(bsdar, 0, "can't find .strtab section");
749 elf_end(e);
750 return;
751 }
752
753 scn = NULL;
754 while ((scn = elf_nextscn(e, scn)) != NULL) {
755 if (gelf_getshdr(scn, &shdr) != &shdr) {
756 bsdar_warnc(bsdar, EX_SOFTWARE, 0,
757 "elf_getshdr failed: %s", elf_errmsg(-1));
758 continue;
759 }
760 if (shdr.sh_type != SHT_SYMTAB)
761 continue;
762
763 data = NULL;
764 n = 0;
765 while (n < shdr.sh_size &&
766 (data = elf_getdata(scn, data)) != NULL) {
767 len = data->d_size / shdr.sh_entsize;
768 for (i = 0; i < len; i++) {
769 if (gelf_getsym(data, i, &sym) != &sym) {
770 bsdar_warnc(bsdar, EX_SOFTWARE, 0,
771 "gelf_getsym failed: %s",
772 elf_errmsg(-1));
773 continue;
774 }
775
776 /* keep only global or weak symbols */
777 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL &&
778 GELF_ST_BIND(sym.st_info) != STB_WEAK)
779 continue;
780
781 /* keep only defined symbols */
782 if (sym.st_shndx == SHN_UNDEF)
783 continue;
784
785 if ((name = elf_strptr(e, tabndx,
786 sym.st_name)) == NULL) {
787 bsdar_warnc(bsdar, EX_SOFTWARE, 0,
788 "elf_strptr failed: %s",
789 elf_errmsg(-1));
790 continue;
791 }
792
793 add_to_ar_sym_table(bsdar, name);
794 }
795 }
796 }
797 elferr = elf_errno();
798 if (elferr != 0)
799 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_nextscn failed: %s",
800 elf_errmsg(elferr));
801
802 elf_end(e);
803}
804
805/*
806 * Append to the archive string table buffer.
807 */
808static void
809add_to_ar_str_table(struct bsdar *bsdar, const char *name)
810{
811
812 if (bsdar->as == NULL) {
813 bsdar->as_cap = _INIT_AS_CAP;
814 bsdar->as_sz = 0;
815 if ((bsdar->as = malloc(bsdar->as_cap)) == NULL)
816 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
817 }
818
819 /*
820 * The space required for holding one member name in as table includes:
821 * strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding).
822 */
823 while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) {
824 bsdar->as_cap *= 2;
825 bsdar->as = realloc(bsdar->as, bsdar->as_cap);
826 if (bsdar->as == NULL)
827 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
828 }
829 strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name));
830 bsdar->as_sz += strlen(name);
831 bsdar->as[bsdar->as_sz++] = '/';
832 bsdar->as[bsdar->as_sz++] = '\n';
833}
834
835/*
836 * Append to the archive symbol table buffer.
837 */
838static void
839add_to_ar_sym_table(struct bsdar *bsdar, const char *name)
840{
841
842 if (bsdar->s_so == NULL) {
843 if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) ==
844 NULL)
845 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
846 bsdar->s_so_cap = _INIT_SYMOFF_CAP;
847 bsdar->s_cnt = 0;
848 }
849
850 if (bsdar->s_sn == NULL) {
851 if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL)
852 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
853 bsdar->s_sn_cap = _INIT_SYMNAME_CAP;
854 bsdar->s_sn_sz = 0;
855 }
856
857 if (bsdar->s_cnt * sizeof(uint32_t) >= bsdar->s_so_cap) {
858 bsdar->s_so_cap *= 2;
859 bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap);
860 if (bsdar->s_so == NULL)
861 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
862 }
863 bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off;
864 bsdar->s_cnt++;
865
866 /*
867 * The space required for holding one symbol name in sn table includes:
868 * strlen(name) + (1 for '\n') + (possibly 1 for padding).
869 */
870 while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) {
871 bsdar->s_sn_cap *= 2;
872 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap);
873 if (bsdar->s_sn == NULL)
874 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
875 }
876 strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name));
877 bsdar->s_sn_sz += strlen(name);
878 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
879}