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/usr.bin/ar/write.c

https://bitbucket.org/freebsd/freebsd-head/
C | 874 lines | 601 code | 102 blank | 171 comment | 217 complexity | 374825b7b557d8ae729eef86f65999bd MD5 | raw file
  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
 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	free_obj(struct bsdar *bsdar, struct ar_obj *obj);
 62static void	insert_obj(struct bsdar *bsdar, struct ar_obj *obj,
 63		    struct ar_obj *pos);
 64static void	read_objs(struct bsdar *bsdar, const char *archive,
 65		    int checkargv);
 66static void	write_archive(struct bsdar *bsdar, char mode);
 67static void	write_cleanup(struct bsdar *bsdar);
 68static void	write_data(struct bsdar *bsdar, struct archive *a,
 69		    const void *buf, size_t s);
 70static void	write_objs(struct bsdar *bsdar);
 71
 72void
 73ar_mode_d(struct bsdar *bsdar)
 74{
 75
 76	write_archive(bsdar, 'd');
 77}
 78
 79void
 80ar_mode_m(struct bsdar *bsdar)
 81{
 82
 83	write_archive(bsdar, 'm');
 84}
 85
 86void
 87ar_mode_q(struct bsdar *bsdar)
 88{
 89
 90	write_archive(bsdar, 'q');
 91}
 92
 93void
 94ar_mode_r(struct bsdar *bsdar)
 95{
 96
 97	write_archive(bsdar, 'r');
 98}
 99
100void
101ar_mode_s(struct bsdar *bsdar)
102{
103
104	write_archive(bsdar, 's');
105}
106
107void
108ar_mode_A(struct bsdar *bsdar)
109{
110
111	write_archive(bsdar, 'A');
112}
113
114/*
115 * Create object from file, return created obj upon success, or NULL
116 * when an error occurs or the member is not newer than existing
117 * one while -u is specified.
118 */
119static struct ar_obj *
120create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime)
121{
122	struct ar_obj		*obj;
123	struct stat		 sb;
124	const char		*bname;
125
126	if (name == NULL)
127		return (NULL);
128
129	obj = malloc(sizeof(struct ar_obj));
130	if (obj == NULL)
131		bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
132	if ((obj->fd = open(name, O_RDONLY, 0)) < 0) {
133		bsdar_warnc(bsdar, errno, "can't open file: %s", name);
134		free(obj);
135		return (NULL);
136	}
137
138	if ((bname = basename(name)) == NULL)
139		bsdar_errc(bsdar, EX_SOFTWARE, errno, "basename failed");
140	if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) {
141		if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL)
142			bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
143		(void)strncpy(obj->name, bname, _TRUNCATE_LEN);
144		obj->name[_TRUNCATE_LEN] = '\0';
145	} else
146		if ((obj->name = strdup(bname)) == NULL)
147		    bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
148
149	if (fstat(obj->fd, &sb) < 0) {
150		bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name);
151		goto giveup;
152	}
153	if (!S_ISREG(sb.st_mode)) {
154		bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name);
155		goto giveup;
156	}
157
158	/*
159	 * When option '-u' is specified and member is not newer than the
160	 * existing one, the replace will not happen. While if mtime == 0,
161	 * which indicates that this is to "replace a none exist member",
162	 * the replace will proceed regardless of '-u'.
163	 */
164	if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime)
165		goto giveup;
166
167	/*
168	 * When option '-D' is specified, mtime and UID / GID from the file
169	 * will be replaced with 0, and file mode with 644. This ensures that 
170	 * checksums will match for two archives containing the exact same
171	 * files.
172	 */
173	if (bsdar->options & AR_D) {
174		obj->uid = 0;
175		obj->gid = 0;
176		obj->mtime = 0;
177		obj->md = S_IFREG | 0644;
178	} else {
179		obj->uid = sb.st_uid;
180		obj->gid = sb.st_gid;
181		obj->mtime = sb.st_mtime;
182		obj->md = sb.st_mode;
183	}
184	obj->size = sb.st_size;
185	obj->dev = sb.st_dev;
186	obj->ino = sb.st_ino;
187
188	if (obj->size == 0) {
189		obj->maddr = NULL;
190		return (obj);
191	}
192
193	if ((obj->maddr = mmap(NULL, obj->size, PROT_READ,
194	    MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) {
195		bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name);
196		goto giveup;
197	}
198	if (close(obj->fd) < 0)
199		bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
200		    obj->name);
201
202	return (obj);
203
204giveup:
205	if (close(obj->fd) < 0)
206		bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
207		    obj->name);
208	free(obj->name);
209	free(obj);
210	return (NULL);
211}
212
213/*
214 * Free object itself and its associated allocations.
215 */
216static void
217free_obj(struct bsdar *bsdar, struct ar_obj *obj)
218{
219	if (obj->fd == -1)
220		free(obj->maddr);
221	else
222		if (obj->maddr != NULL && munmap(obj->maddr, obj->size))
223			bsdar_warnc(bsdar, errno,
224			    "can't munmap file: %s", obj->name);
225	free(obj->name);
226	free(obj);
227}
228
229/*
230 * Insert obj to the tail, or before/after the pos obj.
231 */
232static void
233insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos)
234{
235	if (obj == NULL)
236		bsdar_errc(bsdar, EX_SOFTWARE, 0, "try to insert a null obj");
237
238	if (pos == NULL || obj == pos)
239		/*
240		 * If the object to move happens to be the position obj,
241		 * or if there is not a pos obj, move it to tail.
242		 */
243		goto tail;
244
245	if (bsdar->options & AR_B) {
246		TAILQ_INSERT_BEFORE(pos, obj, objs);
247		return;
248	}
249	if (bsdar->options & AR_A) {
250		TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs);
251		return;
252	}
253
254tail:
255	TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
256
257}
258
259/*
260 * Read objects from archive into v_obj list. Note that checkargv is
261 * set when read_objs is used to read objects from the target of
262 * ADDLIB command (ar script mode), in this case argv array possibly
263 * specifies the members ADDLIB want.
264 */
265static void
266read_objs(struct bsdar *bsdar, const char *archive, int checkargv)
267{
268	struct archive		 *a;
269	struct archive_entry	 *entry;
270	struct ar_obj		 *obj;
271	const char		 *name;
272	const char		 *bname;
273	char			 *buff;
274	char			**av;
275	size_t			  size;
276	int			  i, r, find;
277
278	if ((a = archive_read_new()) == NULL)
279		bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_read_new failed");
280	archive_read_support_compression_none(a);
281	archive_read_support_format_ar(a);
282	AC(archive_read_open_filename(a, archive, DEF_BLKSZ));
283	for (;;) {
284		r = archive_read_next_header(a, &entry);
285		if (r == ARCHIVE_FATAL)
286			bsdar_errc(bsdar, EX_DATAERR, 0, "%s",
287			    archive_error_string(a));
288		if (r == ARCHIVE_EOF)
289			break;
290		if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY)
291			bsdar_warnc(bsdar, 0, "%s", archive_error_string(a));
292		if (r == ARCHIVE_RETRY) {
293			bsdar_warnc(bsdar, 0, "Retrying...");
294			continue;
295		}
296
297		name = archive_entry_pathname(entry);
298
299		/*
300		 * skip pseudo members.
301		 */
302		if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0)
303			continue;
304
305		/*
306		 * If checkargv is set, only read those members specified
307		 * in argv.
308		 */
309		if (checkargv && bsdar->argc > 0) {
310			find = 0;
311			for(i = 0; i < bsdar->argc; i++) {
312				av = &bsdar->argv[i];
313				if (*av == NULL)
314					continue;
315				if ((bname = basename(*av)) == NULL)
316					bsdar_errc(bsdar, EX_SOFTWARE, errno,
317					    "basename failed");
318				if (strcmp(bname, name) != 0)
319					continue;
320
321				*av = NULL;
322				find = 1;
323				break;
324			}
325			if (!find)
326				continue;
327		}
328
329		size = archive_entry_size(entry);
330
331		if (size > 0) {
332			if ((buff = malloc(size)) == NULL)
333				bsdar_errc(bsdar, EX_SOFTWARE, errno,
334				    "malloc failed");
335			if (archive_read_data(a, buff, size) != (ssize_t)size) {
336				bsdar_warnc(bsdar, 0, "%s",
337				    archive_error_string(a));
338				free(buff);
339				continue;
340			}
341		} else
342			buff = NULL;
343
344		obj = malloc(sizeof(struct ar_obj));
345		if (obj == NULL)
346			bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
347		obj->maddr = buff;
348		if ((obj->name = strdup(name)) == NULL)
349			bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
350		obj->size = size;
351		obj->uid = archive_entry_uid(entry);
352		obj->gid = archive_entry_gid(entry);
353		obj->md = archive_entry_mode(entry);
354		obj->mtime = archive_entry_mtime(entry);
355		obj->dev = 0;
356		obj->ino = 0;
357
358		/*
359		 * Objects from archive have obj->fd set to -1,
360		 * for the ease of cleaning up.
361		 */
362		obj->fd = -1;
363		TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
364	}
365	AC(archive_read_close(a));
366	AC(archive_read_finish(a));
367}
368
369/*
370 * Determine the constitution of resulting archive.
371 */
372static void
373write_archive(struct bsdar *bsdar, char mode)
374{
375	struct ar_obj		 *nobj, *obj, *obj_temp, *pos;
376	struct stat		  sb;
377	const char		 *bname;
378	char			**av;
379	int			  i;
380
381	TAILQ_INIT(&bsdar->v_obj);
382	nobj = NULL;
383	pos = NULL;
384	memset(&sb, 0, sizeof(sb));
385
386	/*
387	 * Test if the specified archive exists, to figure out
388	 * whether we are creating one here.
389	 */
390	if (stat(bsdar->filename, &sb) != 0) {
391		if (errno != ENOENT) {
392			bsdar_warnc(bsdar, 0, "stat %s failed",
393			    bsdar->filename);
394			return;
395		}
396
397		/* We do not create archive in mode 'd', 'm' and 's'.  */
398		if (mode != 'r' && mode != 'q') {
399			bsdar_warnc(bsdar, 0, "%s: no such file",
400			    bsdar->filename);
401			return;
402		}
403
404		/* Issue a warning if -c is not specified when creating. */
405		if (!(bsdar->options & AR_C))
406			bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename);
407		goto new_archive;
408	}
409
410	/*
411	 * First read members from existing archive.
412	 */
413	read_objs(bsdar, bsdar->filename, 0);
414
415	/*
416	 * For mode 's', no member will be moved, deleted or replaced.
417	 */
418	if (mode == 's')
419		goto write_objs;
420
421	/*
422	 * For mode 'q', we don't need to adjust existing members either.
423	 * Also, -a, -b and -i are ignored in this mode. New members are
424	 * always inserted at tail.
425	 */
426	if (mode == 'q')
427		goto new_archive;
428
429	/*
430	 * Mode 'A' adds the contents of another archive to the tail of
431	 * current archive. Note that mode 'A' is a special mode for the
432	 * ADDLIB command of the ar script mode. Currently there is no
433	 * access to this function from the ar command line mode.
434	 */
435	if (mode == 'A') {
436		/*
437		 * Read objects from the target archive of ADDLIB command.
438		 * If there are members specified in argv, read those members
439		 * only, otherwise the entire archive will be read.
440		 */
441		read_objs(bsdar, bsdar->addlib, 1);
442		goto write_objs;
443	}
444
445	/*
446	 * Try to find the position member specified by user.
447	 */
448	if (bsdar->options & AR_A || bsdar->options & AR_B) {
449		TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
450			if (strcmp(obj->name, bsdar->posarg) == 0) {
451				pos = obj;
452				break;
453			}
454		}
455
456		/*
457		 * If can't find `pos' specified by user,
458		 * silently insert objects at tail.
459		 */
460		if (pos == NULL)
461			bsdar->options &= ~(AR_A | AR_B);
462	}
463
464	for (i = 0; i < bsdar->argc; i++) {
465		av = &bsdar->argv[i];
466
467		TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
468			if ((bname = basename(*av)) == NULL)
469				bsdar_errc(bsdar, EX_SOFTWARE, errno,
470				    "basename failed");
471			if (bsdar->options & AR_TR) {
472				if (strncmp(bname, obj->name, _TRUNCATE_LEN))
473					continue;
474			} else
475				if (strcmp(bname, obj->name) != 0)
476					continue;
477
478			if (mode == 'r') {
479				/*
480				 * if the new member is not qualified
481				 * to replace the old one, skip it.
482				 */
483				nobj = create_obj_from_file(bsdar, *av,
484				    obj->mtime);
485				if (nobj == NULL)
486					goto skip_obj;
487			}
488
489			if (bsdar->options & AR_V)
490				(void)fprintf(stdout, "%c - %s\n", mode,
491				    *av);
492
493			TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
494			if (mode == 'd' || mode == 'r')
495				free_obj(bsdar, obj);
496
497			if (mode == 'm')
498				insert_obj(bsdar, obj, pos);
499			if (mode == 'r')
500				insert_obj(bsdar, nobj, pos);
501
502		skip_obj:
503			*av = NULL;
504			break;
505		}
506
507	}
508
509new_archive:
510	/*
511	 * When operating in mode 'r', directly add those user specified
512	 * objects which do not exist in current archive. When operating
513	 * in mode 'q', all objects specified in command line args are
514	 * appended to the archive, without comparing with existing ones.
515	 */
516	for (i = 0; i < bsdar->argc; i++) {
517		av = &bsdar->argv[i];
518		if (*av != NULL && (mode == 'r' || mode == 'q')) {
519			nobj = create_obj_from_file(bsdar, *av, 0);
520			if (nobj != NULL)
521				insert_obj(bsdar, nobj, pos);
522			if (bsdar->options & AR_V && nobj != NULL)
523				(void)fprintf(stdout, "a - %s\n", *av);
524			*av = NULL;
525		}
526	}
527
528write_objs:
529	write_objs(bsdar);
530	write_cleanup(bsdar);
531}
532
533/*
534 * Memory cleaning up.
535 */
536static void
537write_cleanup(struct bsdar *bsdar)
538{
539	struct ar_obj		*obj, *obj_temp;
540
541	TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
542		TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
543		free_obj(bsdar, obj);
544	}
545
546	free(bsdar->as);
547	free(bsdar->s_so);
548	free(bsdar->s_sn);
549	bsdar->as = NULL;
550	bsdar->s_so = NULL;
551	bsdar->s_sn = NULL;
552}
553
554/*
555 * Wrapper for archive_write_data().
556 */
557static void
558write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s)
559{
560	if (archive_write_data(a, buf, s) != (ssize_t)s)
561		bsdar_errc(bsdar, EX_SOFTWARE, 0, "%s",
562		    archive_error_string(a));
563}
564
565/*
566 * Write the resulting archive members.
567 */
568static void
569write_objs(struct bsdar *bsdar)
570{
571	struct ar_obj		*obj;
572	struct archive		*a;
573	struct archive_entry	*entry;
574	size_t s_sz;		/* size of archive symbol table. */
575	size_t pm_sz;		/* size of pseudo members */
576	int			 i, nr;
577
578	if (elf_version(EV_CURRENT) == EV_NONE)
579		bsdar_errc(bsdar, EX_SOFTWARE, 0,
580		    "ELF library initialization failed: %s", elf_errmsg(-1));
581
582	bsdar->rela_off = 0;
583
584	/* Create archive symbol table and archive string table, if need. */
585	TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
586		if (!(bsdar->options & AR_SS) && obj->maddr != NULL)
587			create_symtab_entry(bsdar, obj->maddr, obj->size);
588		if (strlen(obj->name) > _MAXNAMELEN_SVR4)
589			add_to_ar_str_table(bsdar, obj->name);
590		bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2;
591	}
592
593	/*
594	 * Pad the symbol name string table. It is treated specially because
595	 * symbol name table should be padded by a '\0', not the common '\n'
596	 * for other members. The size of sn table includes the pad bit.
597	 */
598	if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0)
599		bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
600
601	/*
602	 * Archive string table is padded by a "\n" as the normal members.
603	 * The difference is that the size of archive string table counts
604	 * in the pad bit, while normal members' size fileds do not.
605	 */
606	if (bsdar->as != NULL && bsdar->as_sz % 2 != 0)
607		bsdar->as[bsdar->as_sz++] = '\n';
608
609	/*
610	 * If there is a symbol table, calculate the size of pseudo members,
611	 * convert previously stored relative offsets to absolute ones, and
612	 * then make them Big Endian.
613	 *
614	 * absolute_offset = htobe32(relative_offset + size_of_pseudo_members)
615	 */
616
617	if (bsdar->s_cnt != 0) {
618		s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz;
619		pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz);
620		if (bsdar->as != NULL)
621			pm_sz += _ARHDR_LEN + bsdar->as_sz;
622		for (i = 0; (size_t)i < bsdar->s_cnt; i++)
623			*(bsdar->s_so + i) = htobe32(*(bsdar->s_so + i) +
624			    pm_sz);
625	}
626
627	if ((a = archive_write_new()) == NULL)
628		bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_write_new failed");
629
630	archive_write_set_format_ar_svr4(a);
631	archive_write_set_compression_none(a);
632
633	AC(archive_write_open_filename(a, bsdar->filename));
634
635	/*
636	 * write the archive symbol table, if there is one.
637	 * If options -s is explicitly specified or we are invoked
638	 * as ranlib, write the symbol table even if it is empty.
639	 */
640	if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) ||
641	    bsdar->options & AR_S) {
642		entry = archive_entry_new();
643		archive_entry_copy_pathname(entry, "/");
644		if ((bsdar->options & AR_D) == 0)
645			archive_entry_set_mtime(entry, time(NULL), 0);
646		archive_entry_set_size(entry, (bsdar->s_cnt + 1) *
647		    sizeof(uint32_t) + bsdar->s_sn_sz);
648		AC(archive_write_header(a, entry));
649		nr = htobe32(bsdar->s_cnt);
650		write_data(bsdar, a, &nr, sizeof(uint32_t));
651		write_data(bsdar, a, bsdar->s_so, sizeof(uint32_t) *
652		    bsdar->s_cnt);
653		write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
654		archive_entry_free(entry);
655	}
656
657	/* write the archive string table, if any. */
658	if (bsdar->as != NULL) {
659		entry = archive_entry_new();
660		archive_entry_copy_pathname(entry, "//");
661		archive_entry_set_size(entry, bsdar->as_sz);
662		AC(archive_write_header(a, entry));
663		write_data(bsdar, a, bsdar->as, bsdar->as_sz);
664		archive_entry_free(entry);
665	}
666
667	/* write normal members. */
668	TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
669		entry = archive_entry_new();
670		archive_entry_copy_pathname(entry, obj->name);
671		archive_entry_set_uid(entry, obj->uid);
672		archive_entry_set_gid(entry, obj->gid);
673		archive_entry_set_mode(entry, obj->md);
674		archive_entry_set_size(entry, obj->size);
675		archive_entry_set_mtime(entry, obj->mtime, 0);
676		archive_entry_set_dev(entry, obj->dev);
677		archive_entry_set_ino(entry, obj->ino);
678		archive_entry_set_filetype(entry, AE_IFREG);
679		AC(archive_write_header(a, entry));
680		write_data(bsdar, a, obj->maddr, obj->size);
681		archive_entry_free(entry);
682	}
683
684	AC(archive_write_close(a));
685	AC(archive_write_finish(a));
686}
687
688/*
689 * Extract global symbols from ELF binary members.
690 */
691static void
692create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size)
693{
694	Elf		*e;
695	Elf_Scn		*scn;
696	GElf_Shdr	 shdr;
697	GElf_Sym	 sym;
698	Elf_Data	*data;
699	char		*name;
700	size_t		 n, shstrndx;
701	int		 elferr, tabndx, len, i;
702
703	if ((e = elf_memory(maddr, size)) == NULL) {
704		bsdar_warnc(bsdar, 0, "elf_memory() failed: %s",
705		     elf_errmsg(-1));
706		return;
707	}
708	if (elf_kind(e) != ELF_K_ELF) {
709		/* Silently ignore non-elf member. */
710		elf_end(e);
711		return;
712	}
713	if (elf_getshstrndx(e, &shstrndx) == 0) {
714		bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_getshstrndx failed: %s",
715		     elf_errmsg(-1));
716		elf_end(e);
717		return;
718	}
719
720	tabndx = -1;
721	scn = NULL;
722	while ((scn = elf_nextscn(e, scn)) != NULL) {
723		if (gelf_getshdr(scn, &shdr) != &shdr) {
724			bsdar_warnc(bsdar, 0,
725			    "elf_getshdr failed: %s", elf_errmsg(-1));
726			continue;
727		}
728		if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) {
729			bsdar_warnc(bsdar, 0,
730			    "elf_strptr failed: %s", elf_errmsg(-1));
731			continue;
732		}
733		if (strcmp(name, ".strtab") == 0) {
734			tabndx = elf_ndxscn(scn);
735			break;
736		}
737	}
738	elferr = elf_errno();
739	if (elferr != 0)
740		bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
741		     elf_errmsg(elferr));
742	if (tabndx == -1) {
743		bsdar_warnc(bsdar, 0, "can't find .strtab section");
744		elf_end(e);
745		return;
746	}
747
748	scn = NULL;
749	while ((scn = elf_nextscn(e, scn)) != NULL) {
750		if (gelf_getshdr(scn, &shdr) != &shdr) {
751			bsdar_warnc(bsdar, EX_SOFTWARE, 0,
752			    "elf_getshdr failed: %s", elf_errmsg(-1));
753			continue;
754		}
755		if (shdr.sh_type != SHT_SYMTAB)
756			continue;
757
758		data = NULL;
759		n = 0;
760		while (n < shdr.sh_size &&
761		    (data = elf_getdata(scn, data)) != NULL) {
762			len = data->d_size / shdr.sh_entsize;
763			for (i = 0; i < len; i++) {
764				if (gelf_getsym(data, i, &sym) != &sym) {
765					bsdar_warnc(bsdar, EX_SOFTWARE, 0,
766					    "gelf_getsym failed: %s",
767					     elf_errmsg(-1));
768					continue;
769				}
770
771				/* keep only global or weak symbols */
772				if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL &&
773				    GELF_ST_BIND(sym.st_info) != STB_WEAK)
774					continue;
775
776				/* keep only defined symbols */
777				if (sym.st_shndx == SHN_UNDEF)
778					continue;
779
780				if ((name = elf_strptr(e, tabndx,
781				    sym.st_name)) == NULL) {
782					bsdar_warnc(bsdar, EX_SOFTWARE, 0,
783					    "elf_strptr failed: %s",
784					     elf_errmsg(-1));
785					continue;
786				}
787
788				add_to_ar_sym_table(bsdar, name);
789			}
790		}
791	}
792	elferr = elf_errno();
793	if (elferr != 0)
794		bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_nextscn failed: %s",
795		     elf_errmsg(elferr));
796
797	elf_end(e);
798}
799
800/*
801 * Append to the archive string table buffer.
802 */
803static void
804add_to_ar_str_table(struct bsdar *bsdar, const char *name)
805{
806
807	if (bsdar->as == NULL) {
808		bsdar->as_cap = _INIT_AS_CAP;
809		bsdar->as_sz = 0;
810		if ((bsdar->as = malloc(bsdar->as_cap)) == NULL)
811			bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
812	}
813
814	/*
815	 * The space required for holding one member name in as table includes:
816	 * strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding).
817	 */
818	while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) {
819		bsdar->as_cap *= 2;
820		bsdar->as = realloc(bsdar->as, bsdar->as_cap);
821		if (bsdar->as == NULL)
822			bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
823	}
824	strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name));
825	bsdar->as_sz += strlen(name);
826	bsdar->as[bsdar->as_sz++] = '/';
827	bsdar->as[bsdar->as_sz++] = '\n';
828}
829
830/*
831 * Append to the archive symbol table buffer.
832 */
833static void
834add_to_ar_sym_table(struct bsdar *bsdar, const char *name)
835{
836
837	if (bsdar->s_so == NULL) {
838		if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) ==
839		    NULL)
840			bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
841		bsdar->s_so_cap = _INIT_SYMOFF_CAP;
842		bsdar->s_cnt = 0;
843	}
844
845	if (bsdar->s_sn == NULL) {
846		if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL)
847			bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
848		bsdar->s_sn_cap = _INIT_SYMNAME_CAP;
849		bsdar->s_sn_sz = 0;
850	}
851
852	if (bsdar->s_cnt * sizeof(uint32_t) >= bsdar->s_so_cap) {
853		bsdar->s_so_cap *= 2;
854		bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap);
855		if (bsdar->s_so == NULL)
856			bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
857	}
858	bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off;
859	bsdar->s_cnt++;
860
861	/*
862	 * The space required for holding one symbol name in sn table includes:
863	 * strlen(name) + (1 for '\n') + (possibly 1 for padding).
864	 */
865	while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) {
866		bsdar->s_sn_cap *= 2;
867		bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap);
868		if (bsdar->s_sn == NULL)
869			bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
870	}
871	strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name));
872	bsdar->s_sn_sz += strlen(name);
873	bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
874}